Two special classes are added to the language: ShapeLike and ValueLike. They cannot be constructed, but can be used to determine with isinstance and issubclass to determine whether something can be cast to Shape or a Value, respectively.
As it stands, we have multiple types of objects that can be used as shapes (Shape, ShapeCastable, int, range, EnumMeta) and values (Value, ValueCastable, int, Enum). These types have no common superclass, so there's no easy way to check if an object can be used as a shape or a value, save for actually calling Shape.cast or Value.cast. Introducing ShapeLike and ValueLike provides an idiomatic way to perform such a check.
+
Additionally, when type annotations are in use, there is currently no simple type that can be used for an argument that takes an arbitrary shape- or value-castable object. These new classes provide such a simple type.
In Amaranth, multiple types of objects can be cast to shapes:
+
+
actual Shape objects
+
ShapeCastable objects
+
non-negative integers
+
range objects
+
Enum subclasses with const-castable values
+
+
To check whether an object is of a type that can be cast to a shape, isinstance(obj, ShapeLike) can be used. To check whether a type can be, in general, cast to a shape, issubclass(cls, ShapeLike) can be used.
+
Likewise, multiple types of objects can be cast to values:
+
+
actual Value objects
+
ValueCastable objects
+
integers
+
values of Enum subclasses with const-castable values
+
+
To check whether an object is of a type that can be cast to a value, isinstance(obj, ValueLike) can be used. To check whether a type can be, in general, cast to a value, issubclass(cls, ValueLike) can be used.
A ShapeLike class is provided. It cannot be constructed, and can only be used with isinstance and issubclass, which are overriden by a custom metaclass.
+
issubclass(cls, ShapeLike) returns True for:
+
+
Shape
+
ShapeCastable and its subclasses
+
int and its subclasses
+
range and its subclasses
+
enum.EnumMeta and its subclasses
+
+
isinstance(obj, ShapeLike) returns True for:
+
+
instances of Shape
+
instances of ShapeCastable and its subclasses
+
non-negative int values (and int subclasses)
+
enum.Enum subclasses where every value is a ValueLike
+
+
Similarly, a ValueLike class is provided.
+
issubclass(cls, ValueLike) returns True for:
+
+
Value and its subclasses
+
ValueCastable and its subclasses
+
int and its subclasses
+
enum.Enum subclasses where every value is a ValueLike
isinstance(obj, ShapeLike) does not actually guarantee that Shape.cast(obj) will succeed — the instance check looks only at surface-level information, and an exception can still be thrown. issubclass(cls, ShapeLike) is, by necessity, even more inaccurate.
There are many ways to implement the instance and subclass checks, some more precise (and complex) than others. The semantics described above are a compromise.
+
For isinstance, a simple variant would be to just try Shape.cast or Value.cast and see if it raises an exception. However, this will sometimes result in isinstance(MyShapeCastable(), ShapeLike) returning False, which may be very unintuitive and hide bugs.
+
The check for a valid shape-castable enum described above is an approximation — the actual logic used requires all values of an enum to be const-castable, not just value-castable. However, there is no way to check this without actually invoking Value.cast on the enum members.
Python has the concept of abstract base classes, such as collections.abc.Sequence, which can be used for subclass checking even if they are not actual superclasses of the types involved. ShapeLike and ValueLike are effectively ABCs, though they do not use the actual ABC machinery (due to having custom logic in instance checking).
Two special classes are added to the language: ShapeLike and ValueLike. They cannot be constructed, but can be used to determine with isinstance and issubclass to determine whether something can be cast to Shape or a Value, respectively.
As it stands, we have multiple types of objects that can be used as shapes (Shape, ShapeCastable, int, range, EnumMeta) and values (Value, ValueCastable, int, Enum). These types have no common superclass, so there's no easy way to check if an object can be used as a shape or a value, save for actually calling Shape.cast or Value.cast. Introducing ShapeLike and ValueLike provides an idiomatic way to perform such a check.
+
Additionally, when type annotations are in use, there is currently no simple type that can be used for an argument that takes an arbitrary shape- or value-castable object. These new classes provide such a simple type.
In Amaranth, multiple types of objects can be cast to shapes:
+
+
actual Shape objects
+
ShapeCastable objects
+
non-negative integers
+
range objects
+
Enum subclasses with const-castable values
+
+
To check whether an object is of a type that can be cast to a shape, isinstance(obj, ShapeLike) can be used. To check whether a type can be, in general, cast to a shape, issubclass(cls, ShapeLike) can be used.
+
Likewise, multiple types of objects can be cast to values:
+
+
actual Value objects
+
ValueCastable objects
+
integers
+
values of Enum subclasses with const-castable values
+
+
To check whether an object is of a type that can be cast to a value, isinstance(obj, ValueLike) can be used. To check whether a type can be, in general, cast to a value, issubclass(cls, ValueLike) can be used.
A ShapeLike class is provided. It cannot be constructed, and can only be used with isinstance and issubclass, which are overriden by a custom metaclass.
+
issubclass(cls, ShapeLike) returns True for:
+
+
Shape
+
ShapeCastable and its subclasses
+
int and its subclasses
+
range and its subclasses
+
enum.EnumMeta and its subclasses
+
+
isinstance(obj, ShapeLike) returns True for:
+
+
instances of Shape
+
instances of ShapeCastable and its subclasses
+
non-negative int values (and int subclasses)
+
enum.Enum subclasses where every value is a ValueLike
+
+
Similarly, a ValueLike class is provided.
+
issubclass(cls, ValueLike) returns True for:
+
+
Value and its subclasses
+
ValueCastable and its subclasses
+
int and its subclasses
+
enum.Enum subclasses where every value is a ValueLike
isinstance(obj, ShapeLike) does not actually guarantee that Shape.cast(obj) will succeed — the instance check looks only at surface-level information, and an exception can still be thrown. issubclass(cls, ShapeLike) is, by necessity, even more inaccurate.
There are many ways to implement the instance and subclass checks, some more precise (and complex) than others. The semantics described above are a compromise.
+
For isinstance, a simple variant would be to just try Shape.cast or Value.cast and see if it raises an exception. However, this will sometimes result in isinstance(MyShapeCastable(), ShapeLike) returning False, which may be very unintuitive and hide bugs.
+
The check for a valid shape-castable enum described above is an approximation — the actual logic used requires all values of an enum to be const-castable, not just value-castable. However, there is no way to check this without actually invoking Value.cast on the enum members.
Python has the concept of abstract base classes, such as collections.abc.Sequence, which can be used for subclass checking even if they are not actual superclasses of the types involved. ShapeLike and ValueLike are effectively ABCs, though they do not use the actual ABC machinery (due to having custom logic in instance checking).
A similar ABC-like class has been proposed for lib.wiring interfaces.
diff --git a/rfcs/searchindex.js b/rfcs/searchindex.js
index 5ab4201f..1b6fde8f 100644
--- a/rfcs/searchindex.js
+++ b/rfcs/searchindex.js
@@ -1 +1 @@
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Many changes, including bug fixes and documentation improvements can be implemented and reviewed via the normal GitHub pull request workflow. Some changes though are \"substantial\", and we ask that these be put through a bit of a design process and produce a consensus among the Amaranth community. Table of Contents Opening Table of Contents When you need to follow this process Before creating an RFC What the process is The RFC life-cycle Reviewing RFCs Implementing an RFC Acknowledgements License When you need to follow this process You need to follow this process if you intend to make \"substantial\" changes to core Amaranth language . In the future you will need to follow this process for the standard I/O library and the System-on-Chip library as well, but at the moment they are not covered. What constitutes a \"substantial\" change is evolving based on community norms and varies depending on what part of the ecosystem you are proposing to change, but may include the following: Any semantic or syntactic change to the language (amaranth.hdl) that is not a bugfix. Behavioral changes to the standard library (amaranth.lib). Behavioral changes to the toolchain interface (amaranth.vendor). Some changes do not require an RFC: Rephrasing, reorganizing, refactoring, or otherwise \"changing shape does not change meaning\". Additions that strictly improve objective, numerical quality criteria (warning removal, speedup, better platform coverage, handling more errors, etc.) If you submit a pull request to implement a new feature without going through the RFC process, it may be closed with a polite request to submit an RFC first. When in doubt, please open an issue to discuss the feature first and one of the core maintainers will say if the change requires an RFC or not. Before creating an RFC A hastily-proposed RFC can hurt its chances of acceptance. Low quality proposals, proposals for previously-rejected features, or those that don't fit into the near-term roadmap, may be quickly rejected, which can be demotivating for the unprepared contributor. Laying some groundwork ahead of the RFC can make the process smoother. Although there is no single way to prepare for submitting an RFC, it is generally a good idea to pursue feedback from other project developers beforehand, to ascertain that the RFC may be desirable; having a consistent impact on the project requires concerted effort toward consensus-building. The most common preparations for writing and submitting an RFC include talking the idea over on our IRC channel, #amaranth-lang at libera.chat , or opening an issue on the corresponding repository to gather feedback. What the process is In short, to get a major feature added to Amaranth, one must first get the RFC merged into the RFC repository as a markdown file. At that point the RFC is \"active\" and may be implemented with the goal of eventual inclusion into Amaranth. Fork the RFC repository. Copy 0000-template.md to text/0000-my-feature.md (where \"my-feature\" is descriptive). Don't assign an RFC number yet; This is going to be the PR number and we'll rename the file accordingly if the RFC is accepted. Fill in the RFC. Put care into the details: RFCs that do not present convincing motivation, demonstrate lack of understanding of the design's impact, or are disingenuous about the drawbacks or alternatives tend to be poorly-received. Submit a pull request. As a pull request the RFC will receive design feedback from the larger community, and the author should be prepared to revise it in response. Now that your RFC has an open pull request, use the issue number of the PR to update your 0000- prefix to that number. Build consensus and integrate feedback. RFCs that have broad support are much more likely to make progress than those that don't receive any comments. Feel free to reach out to the RFC assignee in particular to get help identifying stakeholders and obstacles. RFCs rarely go through this process unchanged, especially as alternatives and drawbacks are shown. You can make edits, big and small, to the RFC to clarify or change the design, but make changes as new commits to the pull request, and leave a comment on the pull request explaining your changes. Specifically, do not squash or rebase commits after they are visible on the pull request. At some point, a core maintainer will make a decision on the disposition for the RFC (merge, close, or postpone). This step is taken when enough of the tradeoffs have been discussed that the core maintainer is in a position to make a decision. That does not require consensus amongst all participants in the RFC thread (which is usually impossible). However, the argument supporting the disposition on the RFC needs to have already been clearly articulated, and there should not be a strong consensus against that position. The RFC life-cycle Once an RFC becomes \"active\" then authors may implement it and submit the feature as a pull request to the corresponding repository. Being \"active\" is not a rubber stamp, and in particular still does not mean the feature will ultimately be merged; it does mean that in principle all the major stakeholders have agreed to the feature and are amenable to merging it. Furthermore, the fact that a given RFC has been accepted and is \"active\" implies nothing about what priority is assigned to its implementation, nor does it imply anything about whether a developer has been assigned the task of implementing the feature. While it is not necessary that the author of the RFC also write the implementation, it is by far the most effective way to see an RFC through to completion: authors should not expect that other project developers will take on responsibility for implementing their accepted feature. Modifications to \"active\" RFCs can be done in follow-up pull requests. We strive to write each RFC in a manner that it will reflect the final design of the feature; but the nature of the process means that we cannot expect every merged RFC to actually reflect what the end result will be at the time of the next major release. In general, once accepted, RFCs should not be substantially changed. Only very minor changes should be submitted as amendments. More substantial changes should be new RFCs, with a note added to the original RFC. Exactly what counts as a \"very minor change\" is up to the core maintainers to decide. Reviewing RFCs While the RFC pull request is up, the core maintainers may schedule meetings with the author and/or relevant stakeholders to discuss the issues in greater detail, and the topic may be discussed at weekly meetings. In either case a summary from the meeting will be posted back to the RFC pull request. A core maintainer makes final decisions about RFCs after the benefits and drawbacks are well understood. These decisions can be made at any time, but the core maintainer will regularly issue decisions. When a decision is made, the RFC pull request will either be merged or closed. In either case, if the reasoning is not clear from the discussion in thread, the core maintainer will add a comment describing the rationale for the decision. Implementing an RFC Some accepted RFCs represent vital features that need to be implemented right away. Other accepted RFCs can represent features that can wait until some arbitrary developer feels like doing the work. Every accepted RFC has an associated issue tracking its implementation in the corresponding repository. The author of an RFC is not obligated to implement it. Of course, the RFC author (like any other developer) is welcome to post an implementation for review after the RFC has been accepted. If you are interested in working on the implementation for an \"active\" RFC, but cannot determine if someone else is already working on it, feel free to ask (e.g. by leaving a comment on the associated issue). RFC Postponement Some RFC pull requests are tagged with the \"postponed\" label when they are closed (as part of the rejection process). An RFC closed with \"postponed\" is marked as such because we want neither to think about evaluating the proposal nor about implementing the described feature until some time in the future, and we believe that we can afford to wait until then to do so. Postponed pull requests may be re-opened when the time is right. We don't have any formal process for that, you should ask a core maintainer. Usually an RFC pull request marked as \"postponed\" has already passed an informal first round of evaluation, namely the round of \"do we think we would ever possibly consider making this change, as outlined in the RFC pull request, or some semi-obvious variation of it.\" (When the answer to the latter question is \"no\", then the appropriate response is to close the RFC, not postpone it.) Acknowledgements The process described in this document is based on the Rust RFC process . It has been simplified to match the needs of the much smaller Amaranth community; in particular, policy (including the RFC process itself) is not currently defined through the RFC process. License This repository is licensed under the MIT license .","breadcrumbs":"Introduction","id":"0","title":"Introduction"},"1":{"body":"Start Date: 2023-02-14 RFC PR: amaranth-lang/rfcs#1 Amaranth Issue: amaranth-lang/amaranth#748 Aggregate data structure library Amendments The behavior described in this RFC was updated by RFC #8 , RFC #9 , and RFC #15 . Summary Add a rich set of standard library classes for accessing hierarchical aggregate data an idiomatic way, to fill one of the two major use cases of Record while avoiding its downsides. See also RFC #2 . Motivation Amaranth has a single data storage primitive: Signal. A Signal can be referenced on the left hand and the right hand side of an assignment, and so can be its slices. Although a signal serves the role of a numeric and bit container type fine, designs often include signals used as bit containers whose individual bits are named and have unique meanings. A mechanism that allows referring to such bit fields by name is essential. Currently, the role of this mechanism is served by Record. However, Record has multiple major drawbacks: Record attempts to do too much: it is both a mechanism for controlling representation (including implicitly casting a record to a value) and a mechanism for defining interfaces (specifying signal directions and facilitating connections between records). These mechanisms should be defined separately, since the only aspect they have in common is using a container class that consists of multiple named fields. Conflating the two mechanisms constraints the design space, making addressing the other drawbacks impossible, and the ill-defined scope encourages bugs in downstream code. Record has limited composability: records can only be nested within each other. Practical designs (in particular, implementations of protocols) use data with complex representation beyond nested sequences of fields: these include overlaid sequences of fields (where interpretation alternates based on some discriminant) and arrays of fields (where a field can be indexed by a non-constant), where any individual field can have a complex representation itself. Record is structured as a sequence of Signals, which is a part of its API. As such, it cannot support overlaid fields, and implementing support for arrays of fields is challenging. Record has limited introspectability: while its layout member can be accessed to enumerate its fields, the results do not include field boundaries, and the types of the returned shape-castable objects are preserved only as an implementation detail. Layout objects themselves are also not shape-castable. Record and Layout are structured as a sequence of Signals rather than a view into an underlying bit container, which is reflected in its API. Thus, Layout does not fit into Amaranth's data model, which concerns individual values. Record comes with its own storage: while its fields argument can be used to substitute the signals that individual fields are pointing to (in an awkward and error-prone way), it is still a collection of Signals. Using Record to impose structure on an existing Value requires a Module and a combinatorial assignment. This is an unnecessary complication, especially in helper functions. Record does not play well with Python's type annotations. Amaranth developers often inherit from Record as well as Layout, but in both cases the class definition syntax is usually little more than a way to define a callable returning a Record with a specific layout, and provides no benefits for IDE users. Record reserves a lot of names, including commonly used names like connect, any, all, and matches. Conversely, it defines a lot of arithmetic methods that are rarely if ever used on field containers. Layout's DSL is very amorphous. It passes around variable length tuples. The second element of these tuples (the shape) can be another Layout, which is neither a shape nor a shape-castable object. Neither Record nor Layout allow defining fields whose shapes are arbitrary ShapeCastable classes. Since these drawbacks are entrenched in the public API and heavily restrict usefulness of Record as a mechanism for specifying data representation, a new mechanism must replace it. Overview and examples This section shows a bird's eye view of the new syntax and behavior proposed in this RFC. The detailed design is described afterwards. from amaranth import *\nfrom amaranth.lib import data # Declaring a simple structure:\nclass Float32(data.Struct): fraction: unsigned(23) exponent: unsigned(8) sign: unsigned(1) # Defining a signal with the structure above:\nflt_a = Float32() # Reinterpreting an existing value with the same structure:\nflt_b = Float32(Const(0b00111110001000000000000000000000, 32)) # Referencing and updating structure fields by name:\nwith m.If(flt_b.fraction > 0): m.d.comb += [ flt_a.sign.eq(1), flt_a.exponent.eq(127) ] # Declaring a simple union, referencing an existing structure:\nclass FloatOrInt32(data.Union): float: Float32 int: signed(32) # Using the union to bitcast an IEEE754 value from an integer:\nf_or_i = FloatOrInt32()\nis_sub_1 = Signal()\nm.d.comb += [ f_or_i.int.eq(0x41C80000), is_sub_1.eq(f_or_i.float.exponent < 127) # => 1\n] class Op(enum.Enum): ADD = 0 SUB = 1 # Programmatically declaring a structure layout:\nadder_op_layout = data.StructLayout({ \"op\": Op, \"a\": Float32, \"b\": Float32\n}) # Using the layout defined above to define appropriately sized storage...\nadder_op_storage = Signal(adder_op_layout)\nlen(adder_op_storage) # => 65 # ... and wrap it for the fields to be accessible.\nadder_op = data.View(adder_op_layout, adder_op_storage)\nm.d.comb += [ adder_op.op.eq(Op.SUB), adder_op.a.eq(flt_a), adder_op.b.eq(flt_b)\n] Detailed design This RFC proposes a number of language and library additions: Adding a ShapeCastable interface, similar to ValueCastable; Adding classes that hierarchically describe representation of aggregate values: named field containers with non-overlapping fields (structs), named field containers with overlapping fields (unions), and indexed field containers (arrays); Adding a wrapper class that accepts a Value (or a ValueCastable object) and provides accessors that slice it according to the corresponding aggregate representation; Adding an ergonomic and IDE-compatible interface for building descriptions of non-parametric layouts of aggregate values. User-defined shape-castable objects ShapeCastable is an interface for defining Shape-like values outside of the core Amaranth language. It is functionally identical to ValueCastable, and could be used like: from amaranth import * class Layout(ShapeCastable): def __init__(self, fields): self.fields = fields def as_shape(self): return unsigned(sum(len(field) for field in self.fields)) Value layout descriptions Aggregate value layouts are represented using two classes: amaranth.lib.data.Field and amaranth.lib.data.Layout: A Field(shape_castable, offset=0) object describes a field of the given shape starting at bit number offset of the aggregate value. A Layout() object describes an abstract aggregate value. It can be iterated, returning (name, field) or (index, field) pairs; or indexed (__getitem__) by the name or index of the field. It has a .size in bits, determined by the type of the layout, and is shape-castable, being converted to unsigned(layout.size()). A StructLayout(members={\"name\": shape_castable}) object describes an aggregate value with non-overlapping named fields (struct). The fields are placed at offsets such that they immediately follow one another, from least significant to most significant. A UnionLayout(members={\"name\": shape_castable}) object describes an aggregate value with overlapping named fields (union). The fields are placed at offset 0. An ArrayLayout(element=shape_castable, length=1) object describes an aggregate value with indexed fields (array). The fields all have identical shape and are placed at offsets such that they immediately follow one another, from least significant to most significant. A FlexibleLayout(fields={\"name\": field, 0: field}, size=16) object describes a aggregate value with fields arbitrarily placed within its bounds. The representation of a discriminated union could be programmatically constructed as follows: import enum\nfrom amaranth.lib import data class Kind(enum.Enum): ONE_SIGNED = 0 TWO_UNSIGNED = 1 layout = data.StructLayout({ \"kind\": Kind, \"value\": data.UnionLayout({ \"one_signed\": signed(2), \"two_unsigned\": data.ArrayLayout(unsigned(1), 2) })\n}) Aggregate value access Aggregate values are manipulated through the amaranth.lib.data.View class. A View(layout, value_castable) object wraps a value-castable object (which may be a valid assignment target) and provides access to fields according to the layout. A view is itself value-castable, being converted to the object it's wrapping. If the view is wrapping a valid assignment target, then the accessors also return a valid assignment target. Fields can be accessed using either __getitem__ (for both named and indexed fields) or __getattr__ (for named fields). To avoid name collisions when using __getattr__ to access fields, views do not define any non-reserved attributes of their own except for the .as_value() casting method. Field names starting with _ are reserved as attribute names and and can only be accessed using the view[\"name\"] indexing syntax. When a view is used to access a field whose shape is an ordinary Shape object, the accessor returns a Value of the corresponding shape that slices the viewed object. When a view is used to access a field whose shape is an aggregate value layout, the accessor returns another View with this layout, wrapping the slice of the viewed object. For fields that have any other shape-castable object set as their shape, the behavior is the same as for the Shape case. Views that have an ArrayLayout as their layout can be indexed with a Value. In this case, the viewed object is sliced with Value.word_select. A signal can be manipulated with its structure viewed as the discriminated union defined above as follows: # creates an unsigned(3) signal by shape-casting `layout`\nsig = Signal(layout)\nview = data.View(layout, sig) # if the second argument is omitted, a signal with the right shape is created internally;\n# the line below is equivlent to the two lines above\nview = data.View(layout) m = Module()\nm.d.comb += [ view.kind.eq(Kind.TWO_UNSIGNED), view.value.two_unsigned[0].eq(1),\n] Ergonomic layout definition Rather than using the underlying StructLayout and UnionLayout classes, struct and union layouts can be defined using the Python class definition syntax, with the shapes of the members specified using the PEP 526 variable annotations: class SomeVariant(data.Struct): class Value(data.Union): one_signed: signed(2) two_unsigned: data.ArrayLayout(unsigned(1), 2) kind: Kind value: Value # this class can be used in the same way as a `data.View` without needing to specify the layout:\nview2 = SomeVariant()\nm.d.comb += [ view2.kind.eq(Kind.ONE_SIGNED), view2.value.eq(view.value)\n] When they refer to other structures or unions defined in the same way, the variable annotations are also valid PEP 484 type hints, and will be used by IDEs to derive types of properties and expressions. Otherwise, the annotations will be opaque to IDEs or type checkers, but are still useful for a human reader. The classes defined in this way are shape-castable and can be used anywhere a shape or a aggregate value layout is accepted: sig2 = Signal(SomeVariant)\nlayout2 = data.StructLayout({ \"ready\": unsigned(1), \"payload\": SomeVariant\n}) Implementation note: This can be achieved by using a custom metaclass for Struct and Union that inherits from ShapeCastable. If an explicit Layout object is nevertheless needed (e.g. for introspection), it can be extracted from the class using Layout.cast: layout == data.Layout.cast(SomeVariant) # => True Conversely, the shape-castable object defining the layout of a View (which might be a Layout subclass or a Struct/Union subclass) can be extracted from the view using Layout.of: SomeVariant is data.Layout.of(view2) # => True Advanced usage: Parametric layouts The ergonomic definitions using the Struct and Union base classes are concise and integrated with Python type annotations. However, they cannot be used if the layout of an aggregate value is parameterized. In this case, a class with similar functionality can be defined in a more explicit way: class Stream8b10b(data.View): data: Signal ctrl: Signal def __init__(self, value=None, *, width: int): super().__init__(data.StructLayout({ \"data\": unsigned(8 * width), \"ctrl\": unsigned(width) }), value) len(Stream8b10b(width=1).data) # => 8\nlen(Stream8b10b(width=4).data) # => 32 Since the parametric class name itself does not have a fixed layout, it cannot be used with Layout.cast. Similarly, the type annotations cannot include specific field widths; they are included only to indicate the presence of a corresponding attribute to IDEs and type checkers. Structure field ordering The fields of a structure layout object are ordered from least significant to most significant: float32_layout = data.StructLayout({ \"fraction\": unsigned(23), # bits 0..22 \"exponent\": unsigned(8), # bits 23..30 \"sign\": unsigned(1) # bit 31\n}) class Float32(data.Struct): fraction: unsigned(23) # bits 0..22 exponent: unsigned(8) # bits 23..30 sign: unsigned(1) # bit 31 In other words, the following identity holds: float32_storage = Signal(float32_layout)\nfloat32 = data.View(float32_layout, float32_storage) float32_storage == Cat(float32.fraction, float32_layout.exponent, float32.sign) Customizing the automatically created Signal When a view is instantiated without an explicit view target, it creates a Signal with a shape matching the view layout. The View constructor accepts all of the Signal constructor keyword arguments and passes them along; the reset= argument accepts a struct or an array (according to the type of the layout): flt_neg_reset = data.View(float32_layout, reset={\"sign\": 1}) flt_reset_less = Float32(reset_less=True) Drawbacks This feature introduces a language-level concept, shape-castable objects, increasing language complexity. This feature introduces a finely grained hierarchy of 5 similar and related classes for describing layouts. Alternatives Do nothing. Record will continue to be used alongside the continued proliferation of ad-hoc implementations of similar functionality. Remove ArrayLayout from this proposal. The array functionality is niche and introduces the complexity of handling by-index accessors alongside by-name ones. Remove ArrayLayout, UnionLayout, and FlexibleLayout from this proposal. Their functionality is less commonly used than that of StructLayout and introduces the substantial complexity of handling fields at arbitrary offsets. (This would make amaranth.lib.data useless for slicing CSRs in Amaranth SoC.) This change would bring this proposal close to the original PackedStruct proposal discussed in https://github.com/amaranth-lang/amaranth/issues/342. Combine the Layout and all of its derivative classes into a single Layout(fields={\"name\": Field(...), 0: Field(...)}) class that provides a superset of the functionality. This simplifies the API, but makes introspection of aggregate layouts very difficult and can be inefficient if large arrays are used. In this case, factory methods of the Layout class would be provided for more convenient construction of regular struct, union, and array layouts. Remove Struct and Union annotation-driven definition syntax. This makes the API simpler, less redundant, and with fewer corner cases, also avoiding the use of variable annotations that are not valid PEP 484 type hints, at the cost of a continued jarring experience for IDE users. Include a more concise and less visually noisy way to build StructLayout and UnionLayout objects (or their equivalents) using a builder pattern. This may make the syntax slightly nicer, though the RFC author could not come up with anything that would actually be such. Bikeshedding The names of the Field, *Layout, and View classes could be changed to something better. IrregularLayout was renamed to FlexibleLayout. Future work This feature could be improved in several ways that are not in scope of this RFC: StructLayout, UnionLayout, and ArrayLayout could be extended to generate layouts with padding at the end (for structs and unions) or between elements (for arrays). Currently this requires the use of a FlexibleLayout. StructLayout could be extended to accept a list of fields in addition to a map of field names to values. In this case, it would represent an aggregate value with non-overlapping indexed fields (tuple). Struct and/or StructLayout could be extended to treat certain reserved field names (e.g. \"_1\", \"_2\", ...) as designating padding bits. In this case, the offset of the following fields would be adjusted, and the fields with such names would not appear in the layout. Struct and/or StructLayout could be extended to treat certain reserved field names (e.g. \"_\" for Struct and None for StructLayout) as designating an anonymous inner aggregate. In this case, the members of the anonymous inner aggregate would be possible to access as if they were the members of the outer aggregate. The automatic wrapping of accessed aggregate fields done by View could be extended to call a user-specified cast function rather than hard-coding a check for whether the shape is a Layout. This would allow seamless inclusion of user-defined value-castable types in aggregates. The PEP 484 generics could be used to define layouts parametric over field shapes, using type annotations alone. Since Python does not have type-level integers, layouts parametric over field sizes would still need to be defined explicitly. The struct, union, and enum support could be used as the building blocks to implement first-class discriminated unions. Discriminated unions will also benefit from tuples, described above. ( Suggestion by @lachlansneff.) Acknowledgements @modwizcode , @Kaucasus , and @lachlansneff provided valuable feedback while this RFC was being drafted.","breadcrumbs":"0001-aggregate-data-structures","id":"1","title":"0001-aggregate-data-structures"},"10":{"body":"Start Date: 2023-05-15 RFC PR: amaranth-lang/rfcs#15 Amaranth Issue: amaranth-lang/amaranth#784 Lifting shape-castable objects Summary Make Signal(shape_castable, ...) return shape_castable(Signal(shape_castable.as_shape(), ...)). Motivation When Amaranth was a very new language, it did not have any facilities for ascribing type information to data. It had shapes (width and signedness), and it had special handling for range() in the shape position, as well as enumerations. Back then it made sense to have Signal, the single way to define new storage of any kind, to only operate on values (numbers / bit containers). Today the situation is completely different. Amaranth has first-class support for enumerations in the standard library as well as the standard range of data structures (structs, unions, arrays) via RFC 1 and RFC 3 . It provides extensibility through RFC 8 and RFC 9 . Using the existing hooks alone it is possible to extend Amaranth with rich numeric types (fixed-point, complex, potentially even floating-point), and some of these are very likely to end up in the standard library. All of this new functionality internally wraps a Value. It is so common and useful to initialize e.g. a struct view with a fresh Signal that data.View reexports all of the arguments of the Signal constructors and automatically constructs a Signal if no view target is provided. This works, but ties the two together more than would be ideal, and requires every similar facility to reimplement the functionality itself. What is worse is that it seems to be quite confusing to programmers, since it's not apparent that calling data.View(foo_layout) internally creates a Signal. Furthermore, people want to call Signal(foo_layout) to construct some storage for foo_layout, and that works (foo_layout is shape-castable), but does the wrong thing: the returned object is a Signal, not a data.View. It would make teaching a lot easier if we could draw an equivalence between a Signal and a variable in a general purpose programming language, and between its shape and a type in a general purpose programming language. Then, no matter what shape-castable object it is, the way to make some storage is Signal(x). It will also simplify the internals a fair bit. This change wasn't practical before RFC 8 and RFC 9 laid the groundwork for it, but now it is an obvious extension. Guide-level explanation To include state in a design, use the Signal(shape) constructor, where shape describes the bit layout and possible operations on that state. The reset= argument and the returned value depend on the shape that is provided. If it is signed(N) or unsigned(N) or a built-in enumeration or a range, then a plain Value is returned, and the reset= argument accepts a number, an enumeration member, or a constant. If it is a data.Layout, then a data.View is returned, and the reset= argument accepts a sequence or a mapping, potentially nested for nested layouts. Other shape-castable classes will have their own behavior. Warning The existing syntax for creating a View with a new Signal underlying it will be removed immediately (it has never been in a release) to resolve an ambiguity over the semantics of __call__. Reference-level explanation A method def __call__(self, value): is added on ShapeCastable. It must return Value or a ValueCastable instance with the right shape. (Such a method is opportunistically used by data.View for nested views since RFC 8 , however this RFC makes it mandatory for all shape-castable objects.) The Signal.__call__(shape, ...) method is overridden (on the metaclass) to consider shape. First, a signal is constructed normally with all of the arguments. Afterwards, if shape is a ShapeCastable instance, then shape(signal) is returned. Otherwise signal is returned. Drawbacks Increase in language complexity. More metaclasses. Signal is a final class so this is unlikely to go wrong. A Signal() constructor sometimes returning non-Signal objects can be confusing. Rationale and alternatives There are several arguments in favor of the design: It does not de facto introduce any new methods on protocols, since ShapeCastable.__call__ is expected to be implemented by essentially everyone after RFC 8 . It does not introduce new complexity to Signal.__init__; the logic for handling non-integer reset exists since RFC 9 . It eliminates unnecessary coupling between data.View (and other similar facilities) and Signal(). It is a natural extension of the language and has clear parallels to the notion of variables in other languages. It has been repeatedly requested by users, almost every time someone became familiar with the aggregate data structure design. All of these points are compelling but the last one perhaps the most. The author did not find it a stark enough necessity to introduce themselves but it does seem to be one. Alternatives: Do not do this. The status quo is acceptable. Prior art This RFC brings the semantics of Signal to be very close to semantics of typed variables in other languages. \"Lifting\" in the title of this RFC refers to a concept in functional programming of the same name where a higher order function (Signal, here) is used to generalize an operation over a set of other functions (data.View and other shape-castable objects that implement the __call__ protocol, here). Unresolved questions How does this interact with typechecking? This is a straightforward higher order function so it's probably fine. Future possibilities This RFC is the final one in a chain that started with RFC 1 . Enumerations and ranges could be adjusted such that something other than Value is returned. This creates backwards compatibility concerns though.","breadcrumbs":"0015-lifting-shape-castables","id":"10","title":"0015-lifting-shape-castables"},"11":{"body":"Start Date: 2023-08-22 RFC PR: amaranth-lang/rfcs#18 Amaranth Issue: amaranth-lang/amaranth#873 Reorganize vendor platforms Summary Update amaranth.vendor namespace so that instead of: from amaranth.vendor.lattice_ecp5 import LatticeECP5Platform you would write: from amaranth.vendor import LatticeECP5Platform Motivation Vendor names are ever-changing. Xilinx was bought by AMD and the brand has been phased out. Altera was bought by Intel and the brand has been phased out. SiliconBlue has been bought by Lattice (a long time ago) and the brand has long been phased out but still remains as \"SB\" in SB_LUT primitive name. In addition, we attempt to group FPGA families into a single file, like vendor.lattice_machxo2_3l that has been renamed from vendor.lattice_machxo2. This will likely include another FPGA family as soon as it becomes available. By tying module (and file) names to brand names we create churn. Every Amaranth release so far has included renaming of both platform class names and module names. This causes additional downstream breakage and annoys designers using Amaranth. Guide-level explanation To target your FPGA-based project for a particular FPGA family, import the platform class corresponding to the FPGA family from amaranth.vendor, e.g.: from amaranth.vendor import LatticeECP5Platform Reference-level explanation All of the amaranth.vendor.name modules are renamed to amaranth.vendor._internal_name. Python allows __getattr__ to be present in modules: $ cat >x.py\ndef __getattr__(self, name): return f\"__getattr__({name!r})\"\n$ python\n>>> from x import abc\n>>> abc\n\"__getattr__('abc')\" This allows us to make all the platform classes be present as-if they were defined in the amaranth.vendor modules, while retaining all of the benefits of having them in their own amaranth.vendor._internal_name module, such as lazy loading. Drawbacks Churn. A somewhat unusual loading mechanism could cause confusion. Rationale and alternatives Decoupling marketing/brand names from technical names is increasingly important as Amaranth evolves and supports more FPGA families. It allows us to maintain any internal hierarchy we want without it having any impact on downstream code, which solely operates on names imported from amaranth.vendor. Prior art None. Unresolved questions None. Future possibilities None.","breadcrumbs":"0018-reorganize-vendor-platforms","id":"11","title":"0018-reorganize-vendor-platforms"},"12":{"body":"Start Date: 2023-08-22 RFC PR: amaranth-lang/rfcs#19 Amaranth Issue: amaranth-lang/amaranth#874 Remove amaranth.lib.scheduler Summary Remove amaranth.lib.scheduler and the only class RoundRobin in it. Motivation This module is not used in the sole place for which it was added (Amaranth SoC), it is not especially useful, and it has not undergone proper community review when it was added. Guide-level explanation The module amaranth.lib.scheduler and the sole class RoundRobin in it is removed. To continue using it, copy the contents of the module into your own project. Reference-level explanation The class amaranth.lib.scheduler.RoundRobin is deprecated in Amaranth 0.4 and removed in Amaranth 0.5. Drawbacks Churn. Rationale and alternatives This module is out of place in the standard library. It has not seen much use and is trivially implemented outside of it. Downstream consumers tend to inline the logic anyway. It does not seem like there would be any other uses for the amaranth.lib.scheduler module since any other scheduling algorithm would be more closely tied to the consumer. Unresolved questions None. Future possibilities None.","breadcrumbs":"0019-remove-scheduler","id":"12","title":"0019-remove-scheduler"},"13":{"body":"Start Date: 2023-08-22 RFC PR: amaranth-lang/rfcs#20 Amaranth Issue: amaranth-lang/amaranth#875 Deprecate non-FWFT FIFOs Summary Deprecate non-first-word-fall-through FIFOs. Motivation Currently, FIFOs in amaranth.lib.fifo have two incompatible interfaces: FWFT (first word fallthrough) and non-FWFT. The incompatibility concerns only the read half. FWFT FIFOs have r_data valid when r_rdy is asserted. Non-FWFT FIFOs have r_data valid only after strobing r_en, if the FIFO was empty previously. Non-FWFT interface is awkward and is essentially never used. It is a holdover from Migen and its implementation details that was included for compatibility. There are three downsides to having it: Having non-FWFT FIFOs requires every consumer of the FIFO interface to check for fwft when interacting with the FIFO and either asserting that it is True, or adding a code path to handle it. No one does this. The FWFT interface is directly compatible with streams and allows us to add e.g. r_stream and w_stream to existing FIFOs without adding a wrapper such as stream.FIFO. It also makes any custom FIFOs defined downstream of Amaranth stream-enabled. The notion of FWFT vs non-FWFT FIFOs is confusing and difficult to understand. E.g. the author of this RFC wrote both lib.fifo and the Glasgow FIFO code, and she misused the fwft argument in the latter. Guide-level and reference-level explanation In the next version, instantiating SyncFIFO(fwft=False) emits a deprecation warning. In addition, FIFOInterface's fwft parameter now defaults to True. Other FIFOs have no non-FWFT variant in the first place. In the version after that, there is no way to instantiate SyncFIFO(fwft=False). The feature and all references to it are removed in their entirety. Implementation considerations At the moment, SyncFIFOBuffered is implemented as a register in the output of SyncFIFO(fwft=False). The implementation will need to be rewritten. Drawbacks Churn. There will be no alternative to SyncFIFO(fwft=False). Rationale and alternatives It is feasible to extract SyncFIFO(fwft=False) into its own module that may be used by downstream code that needs non-FWFT FIFOs. It would not implement FIFOInterface. There is no reason the SyncFIFO class could not be copied into downstream code as it is. It is possible to wrap FIFOs in the stream library in a way that ensures only FWFT FIFOs are used. Let's not create pointless wrappers. Prior art Not relevant. Unresolved questions None. Future possibilities This RFC primarily exists to enable better stream interface integration.","breadcrumbs":"0020-deprecate-non-fwft-fifos","id":"13","title":"0020-deprecate-non-fwft-fifos"},"14":{"body":"Start Date: 2023-08-22 RFC PR: amaranth-lang/rfcs#21 Patch releases Summary Change Amaranth versioning from major.minor to major.minor.patch after version 0.4, and define the backport policy for patch releases. Motivation Amaranth 0.3 was released on 2021-12-16; almost two years ago. Several important bugs have been fixed in main since, most notably depending on a version of Jinja2 that is no longer installable. At the moment the policy is to issue only major.minor releases, which was OK in the early days but no longer fits the project. We should change the policy that is used for the next Amaranth release and later ones. Explanation Amaranth feature releases all have the version of major.minor.0. The policy for these releases is unchanged and is tied to our two-step process for making breaking changes. In addition to these releases, Amaranth now has bug-fix releases with the major.minor.patch versions. These are intended to address the need of the community to have bugs fixed before a next feature release can be made, and the policy is designed to minimize developer time spent on them. Bug-fix releases are made when all of the following conditions are satisfied: There is an issue that is fixed in the main branch. A member of the community requests this issue to be fixed in a point release. It is possible to fix the issue such that there is a high degree of confidence that the change will not break existing code using Amaranth with a ~=major.minor version constraint. A community member steps up to backport the fix to the release branch. This could be one of the Amaranth maintainers, or anyone else. Amaranth maintainers have no obligation to back-port any fix. Drawbacks This creates additional work for maintainers. Rationale and alternatives It would be possible to backport all feasible fixes as a policy. This would significantly increase maintainer workload. It is possible to keep the current policy. Because we do not control all of the upstream dependencies (including Python), this seems untenable. Prior art Rust has an even stricter bug-fix release policy: the Rust project only issues patch releases in cases of security issues, widespread miscompilations, or unintentional breaking changes. Unresolved questions Should Amaranth SoC adopt the same policy? Future possibilities Eventually, Amaranth may gain release engineers who will maintain long-living release branches.","breadcrumbs":"0021-patch-releases","id":"14","title":"0021-patch-releases"},"15":{"body":"Start Date: 2023-08-22 RFC PR: amaranth-lang/rfcs#22 Amaranth Issue: amaranth-lang/amaranth#876 Define ValueCastable.shape() Summary Require value-castable objects to have a method that returns their high-level shape. Motivation RFC #15 advanced the extensibility of the language significantly, but broke constructs like Signal.like(Signal(data.StructLayout(...))). In addition, not having a well-defined point for returning the high-level shape (i.e. a shape-castable object from which this value-castable object was creaed rather than a Shape instance) causes workarounds such as data.Layout.of to be added to the language and standard library. Explanation The ValueCastable interface has a method .shape(). This method returns a shape-castable object. Where possibe, this object should, when passed to Signal, create a value-castable object of the same type. amaranth.lib.data.Layout.of is removed immediately. Drawbacks Increased API surface area At one point a commitment was made that the only method ValueCastable will ever define will be as_value. However, radical changes to the language such as RFC #15 make it reasonable to revisit this. Rationale and alternatives This change is the minimal possible one that fixes the problem systemically. Some minor variations in the design are possible: Instead of requiring shape() to be defined (which is a breaking change), this method can be added optionally in the next release and be required in the release after that. This is difficult to do with ValueCastable and will require workarounds both in the core language implementation and in downstream code that operates on ValueCastable objects. ValueCastable is not very widely used yet and the breakage will likely be minimal. Prior art It is typical for a programming language to have a way of retrieving the type of a value. The mechanism being added here is equivalent. Unresolved questions None. Future possibilities None.","breadcrumbs":"0022-valuecastable-shape","id":"15","title":"0022-valuecastable-shape"},"16":{"body":"Start Date: 2023-10-30 RFC PR: amaranth-lang/rfcs#0028 Amaranth Issue: amaranth-lang/amaranth#0929 Allow overriding Value operators Summary Allow overriding binary Value operators with reflected operators in a value-castable type. Motivation A value-castable type can define operators that return another value-castable. However, if the left side operand is a Value, its operator will be called first, casting the right side operand to a plain Value. This creates a mismatch in behavior depending on the type and order of operands. As an example, consider the multiplication of a fixed point value-castable with an integral type: >>> Q(7).const(0.5) * 255\n(fixedpoint Q8.7 (* (const 8'sd64) (const 8'd255)))\n>>> 255 * Q(7).const(0.5)\n(fixedpoint Q8.7 (* (const 8'sd64) (const 8'd255)))\n>>> Q(7).const(0.5) * C(255)\n(fixedpoint Q8.7 (* (const 8'sd64) (const 8'd255)))\n>>> C(255) * Q(7).const(0.5)\n(* (const 8'd255) (const 8'sd64)) Explanation When a binary Value operator is called with a value-castable other, check whether the value-castable implements the reflected variant of the operator first and defer to it when present. Drawbacks Extra logic required around every Value operator. Prior art This is standard behavior for inheritance in Python : Note: If the right operand’s type is a subclass of the left operand’s type and that subclass provides a different implementation of the reflected method for the operation, this method will be called before the left operand’s non-reflected method. This behavior allows subclasses to override their ancestors’ operations. We don't get this behavior automatically because Value is not an ancestor of ValueCastable, but it would make sense for it to behave as it were. Rationale and alternatives As an alternative, Value and ValueCastable could be rearchitected so that ValueCastable inherits from either Value or a common base that implements the Value operators. This would make Python do the right thing w.r.t. operator overriding, but is a larger change with more potential for undesirable consequences. Unresolved questions None. Future possibilities Value.eq() could in the same manner check for and defer to a .req() method, i.e. reflected .eq(), to allow a value-castable to override how assignment from it to a Value is handled.","breadcrumbs":"0028-override-value-operators","id":"16","title":"0028-override-value-operators"},"17":{"body":"Start Date: 2023-11-27 RFC PR: amaranth-lang/rfcs#31 Amaranth Issue: amaranth-lang/amaranth#972 Enumeration type safety Summary Make Amaranth Enum and Flag use a custom ValueCastable view class, enforcing type safety. Motivation Python Enum provides an opaque wrapper over the underlying enum values, providing type safety and guarding against improper usage in arithmetic operations: >>> from enum import Enum\n>>> class EnumA(Enum):\n... A = 0\n... B = 1\n...\n>>> EnumA.A + 1\nTraceback (most recent call last): File \"\", line 1, in \nTypeError: unsupported operand type(s) for +: 'EnumA' and 'int' Likewise, Flag values can be used in bitwise operations, but only within their own type: >>> from enum import Flag\n>>> class FlagA(Flag):\n... A = 1\n... B = 2\n... >>> class FlagB(Flag):\n... C = 1\n... D = 2\n... >>> FlagA.A | FlagA.B\n\n>>> FlagA.A | FlagB.C\nTraceback (most recent call last): File \"\", line 1, in \nTypeError: unsupported operand type(s) for |: 'FlagA' and 'FlagB' However, these safety properties are not currently enforced by Amaranth on enum-typed signals: >>> from amaranth import *\n>>> from amaranth.lib.enum import *\n>>> class FlagA(Flag):\n... A = 1\n... B = 2\n... >>> class FlagB(Flag):\n... C = 1\n... D = 2\n... >>> a = Signal(FlagA)\n>>> b = Signal(FlagB)\n>>> a | b\n(| (sig a) (sig b)) Guide-level explanation Like in Python, Enum and Flag subclasses are considered strongly-typed, while IntEnum and IntFlag are weakly-typed. Enum-typed Amaranth values with strong typing are manipulated through amaranth.lib.enum.EnumView and amaranth.lib.enum.FlagView classes, which wrap an underlying Value in a type-safe container that only allows a small subset of operations. For weakly-typed enums, Value is used directly, providing full interchangeability with other values. An EnumView or a FlagView can be obtained by: Creating an enum-typed signal (a = Signal(MyEnum)) Explicitly casting a value to the enum type (MyEnum(value)) The operations available on EnumView and FlagView include: Comparing for equality to another view of the same enum type (a == b and a != b) Assigning to or from a value Converting to a plain value via Value.cast The operations additionally available on FlagView include: Binary bitwise operations with another FlagView of the same type (a | b, a & b, a ^ b) Bitwise inversion (~a) A custom subclass of EnumView or FlagView can be used for a given enum type if so desired, by using the view_class keyword parameter on enum creation. Reference-level explanation amaranth.lib.enum.EnumView is a ValueCastable subclass. The following operations are defined on it: EnumView(enum, value_castable): creates the view shape(): returns the underlying enum as_value(): returns the underlying value eq(value_castable): delegates to eq on the underlying value __eq__ and __ne__: if the other argument is an EnumView of the same enum type or a value of the enum type, delegates to the corresponding Value operator; otherwise, raises a TypeError All binary arithmetic, bitwise, and remaining comparison operators: raise a TypeError (to override the implementation provided by Value in case of an operation between EnumView and Value) amaranth.lib.enum.FlagView is a subclass of EnumView. The following additional operations are defined on it: __and__, __or__, __xor__: if the other argument is a FlagView of the same enum type or a value of the enum type, delegates to the corresponding Value operator and wraps the result in FlagView; otherwise, raises a TypeError __invert__: inverts all bits in this value corresponding to actually defined flags in the underlying enum type, then wraps the result in FlagView The behavior of EnumMeta.__call__ when called on a value-castable is changed as follows: If the enum has been created with a view_class, the value-castable is wrapped in the given class Otherwise, if the enum type is a subclass of IntEnum or IntFlag, the value-castable is returned as a plain Value Otherwise, if the enum type is a subclass of Flag, the value-castable is wrapped in FlagView Otherwise, the value-castable is wrapped in EnumView The behavior of EnumMeta.const is modified to go through the same logic. Drawbacks This proposal increases language complexity, and is not consistent with eg. how amaranth.lib.data.View operates (which has much more lax type checking). Rationale and alternatives Do nothing. Operations on mismatched types will continue to be silently allowed. Equality could work more like Python equality (always returning false for mismatched types). Assignment could be made strongly-typed as well (with corresponding hook added to Value). Prior art This feature directly parallels the differences between Python's Enum/Flag and IntEnum/IntFlag. Unresolved questions Instead of having an extension point via view_class, we could instead automatically forward all otherwise unknown methods to the underlying enum class, providing it the EnumView as self. Future possibilities None.","breadcrumbs":"0031-enumeration-type-safety","id":"17","title":"0031-enumeration-type-safety"},"18":{"body":"Start Date: 2023-12-04 RFC PR: amaranth-lang/rfcs#34 Amaranth Issue: amaranth-lang/amaranth#985 Rename amaranth.lib.wiring.Interface to PureInterface Summary The Interface class in amaranth.lib.wiring is renamed to PureInterface, to avoid the impression that it is used for all interfaces. Motivation The current naming of the Interface class wrongly suggests that it is the base class to be used for all interfaces, and that isinstance(foo, Interface) is a valid check for an interface. However, this is in stark contrast to how lib.wiring works: any object can be an interface, as long as it has a signature property and compliant members. This misleads users (and, on at least two occasions, amaranth developers), making them write buggy code. Additionally, the naming makes spoken language ambiguous in a bad way, as it is impossible to tell apart \"an interface\" and \"an Interface\". Therefore, this RFC proposes to rename Interface to something more specific and reflecting its function. Guide-level explanation The Interface class in amaranth.lib.wiring is renamed to PureInterface. Reference-level explanation The Interface class in amaranth.lib.wiring is renamed to PureInterface. Drawbacks Minor churn. Rationale and alternatives The new name is, of course, subject to bikeshedding. The names that have been proposed are: PureInterface BareInterface Prior art None. Unresolved questions None. Future possibilities The name Interface that has just been freed up can be reused for an ABC-like class representing all valid interfaces.","breadcrumbs":"0034-interface-rename","id":"18","title":"0034-interface-rename"},"2":{"body":"Start Date: 2023-08-22 RFC PR: amaranth-lang/rfcs#2 Amaranth Issue: amaranth-lang/amaranth#872 Interface definition library RFC Summary Add standard ways of declaring that a component of a design conforms to a particular interface and connecting components with complementary interfaces together, to fill the other of the two major use cases of Record while avoiding its downsides. See also RFC #1 . Motivation Digital designs are composed of densely packed components that communicate with each other using well-defined interfaces. Mechanisms to denote the boundary of a component, to ensure that a component complies to a specified interface, and to make reliable connections between components are essential. Currently, Amaranth provides none of these mechanisms. A component implemented in Amaranth, however well-defined conceptually, has no more external structure than a loose collection of Signals assigned to its attributes; and whether any one of them is a part of the interface or the implementation is up to a guess. Even when an interface is described using amaranth.hdl.rec.Layout, such a description cannot be used to verify even the simplest aspects of compliance, such as presence of fields. Although building components by composing smaller components together is ubiquitous, amaranth.hdl.rec.Layout is not able to compose their interface with the same ease. Connecting components using amaranth.hdl.rec.Record.connect is difficult enough that it sees very little use. Originally, Record was aimed at solving many of these issues. However, it has multiple major drawbacks: Record attempts to do too much: it is both a mechanism for controlling representation (including implicitly casting a record to a value) and a mechanism for defining interfaces (specifying signal directions and facilitating connections between records). These mechanisms should be defined separately, since the only aspect they have in common is using a container class that consists of multiple named fields. Conflating the two mechanisms constraints the design space, making addressing the other drawbacks impossible, and the ill-defined scope encourages bugs in downstream code. Record's model of signal directions is too complex. Because it attempts to model both aggregates with controlled representation and interfaces with defined directionality, every signal can have one of the three directions, the third option being non-directed. While this can be applied in a robust way-- FIRRTL has only one aggregate type that it uses for both purposes--this gives rise to a large combination of features and requires handling many edge cases. Record's model of signal directions is too limited. The two static directionalities it has are the confusingly named \"fanout\" and \"fanin\", which really mean \"from initiator to target\" and \"from target to initiator\". This is insufficient to describe common, straightforward interactions such as two components exchanging streams of data across pairs of identical, complementary endpoints. Records are hard to customize. Records create and hold their signals, only providing the caller with an ability to place caller-created signals into individual fields. Signals often need adjustments: primarily setting a reset value or adding a decoder, but sometimes adding attributes or renaming. These adjustments must be performed at the record creation site, which is burdensome. Record fields can be (apart from sub-records) only plain signals. In many cases, an interface between components carries structured data rather than opaque bit vectors. It is not possible to define inner structure for record fields other than through a sub-record, and using a sub-record for this means that an application-specific endpoint that defines such structure cannot be connected to a generic endpoint that does not. Records are hard to compose. The natural way to define a record is to call the Record constructor with a layout, but this creates the entire layout hierarchy unless parts of it are replaced; and it requires having the layout of the result in advance. Record.connect determines the direction of data flow that it will create by the relative position of the interfaces being connected, with x.connect(y) and y.connect(x) having the oposite polarity of assignments. However, the direction of data flow is defined by the component that exposes the interface. Thus, every call of Record.connect can be done in one of the two very similar ways, one of which is always wrong. Record.connect uses wired-OR to gather the \"fanin\" signals, a feature that exists so that it could be used to connect e.g. Wishbone endpoints together without additional gateware. The assumption that the response signals of inactive endpoints will remain all-zero is, generally, unsound. Record.connect manages connections between interfaces with optional signals at the call site using an include/exclude mechanism. However, the semantics of the non-implemented optional signals are a property of the interface, not the connection. Record and rec.Layout are often used as base classes. The Record.like facility, frequently used because of the poor ergonomics of rec.Layout, loses this information and returns an instance of the base class; rec.Layout does the same when indexed. As a result, there is little value in defining methods and attributes on the subclass, and Record subclasses are little more than a callable computing a layout. Due to the limitations of Record, one might define a plain Python class that exposes compatible attributes. An instance of such a class cannot be compared to a known rec.Layout nor can it be embedded in another Record. Record is value-castable and implements the .eq() protocol. Although useful when all fields are non-directional, using .eq() instead of .connect() when connecting directional interfaces is, generally, unsound. It also reserves commonly used names such as any, all, and matches, and implements arithmetic operations that are rarely if ever used on field containers. rec.Layout's DSL is very amorphous. It passes around variable length tuples. The second element of these tuples (the shape) can be another rec.Layout, which is neither a shape nor a shape-castable object. Since these drawbacks are entrenched in the public API and make Record nearly useless for defining interfaces, a new mechanism must replace it. Outline of the design space Although some HDLs and IRs (Migen, Chisel, FIRRTL, ...) choose to use the same basic aggregate data type to represent structured data and directional interfaces , these mechanisms are in direct conflict. Complex forms of structured data, such as unions, are incompatible with associating directionality independently with every leaf member; and the non-directional nature of stored data requires complicated and error-prone rules when it can become a part of a directional connection. Amaranth, instead, opts to include two superficially similar mechanisms for defining and accessing hierarchical aggregate data: amaranth.lib.data (RFC #1) and amaranth.lib.wiring (this RFC). amaranth.lib.data provides data views that reinterpret bit containers as complex aggregates, and entirely avoids directionality. amaranth.lib.wiring provides signatures that give a concrete shape to signals at component boundaries, and always treats them as directional. When connections are made strictly between an output and a correspondingly named input, interfaces gain a dualistic nature: every connection is made between two interfaces whose port directions are the inverse of each other, and which are identical otherwise. To describe interfaces without repeating oneself, then, one has to pick an arbitrarily preferred directionality (and stick with it). Many interfaces are asymmetric, with data flowing from a source to a sink, or transactions issued from an initiator to a target. Amaranth picks the source or initiator perspective; an interface, examined in isolation, defines as outputs the signals that would be outputs of an initiator (and inputs of a target). Then, when an interface with true (non-flipped) directionality describes a component's output, the same interface with inverse (flipped) directionality symmetrically describes an input. To eliminate the major usability issues with Record.connect, the interface connection mechanism assigns no precedence to interfaces and has no effect on signal directionality; whether a signal is an input or an output depends only on the interface itself. A connection is only made from an output to a matching input, and any other combination is rejected with a diagnostic. This way, connecting a pair of interfaces always leads to the same outcome, regardless of their order. The choice to always treat interface signals as directional and to make their directionality dependent only on the interface itself leaves only one aspect of the design open: when and how interface directionality is flipped. The decisions that determine it affect both ergonomics and soundness. Record.connect in effect gives the programmer an option to flip directionality even when it would create an illegal connection. Conversely, rec.Layout provides no such affordance, even though it is necessary for composing components. To facilitate composing components, the interface's directionality is flipped when it is used as an input, whether a top-level input of a component, or as a constituent of a larger interface. This way, the existing mechanism of annotating the directionality of an interface signal or a module port transparently handles interface composition. Guide-level explanation Amaranth designs are made out of components (Python classes implementing Elaboratable) whose attributes include signals. These signals have directions: \"in\" signals are sampled by the component, while \"out\" signals are driven by it, or left at their reset value, and are provided to be sampled by other components. At the moment, these directions are completely informal, and described in the documentation and/or in the signal name as an i_ or o_ prefix (to make it clearer what the direction is at the point of use, or to disambiguate the ports that would otherwise have identical name): class SequenceSource(Elaboratable): \"\"\" Ports ----- data : Signal(width), out ready : Signal(1), in valid : Signal(1), out \"\"\" def __init__(self, width=16): self.data = Signal(width) self.ready = Signal() self.valid = Signal(reset=1) def elaborate(self, platform): m = Module() with m.If(self.ready): m.d.sync += self.data.eq(self.data + 1) return m The SequenceSource component is implemented as a simple counter producing values for an output stream that is connected to some other component consuming them. On each clock tick, if the consumer is ready , it samples the data (the counter value), and simultaneously with that, the producer advances the data to the next item (the incremented value). Since there is always a next item available and it is ready for consumption on the next clock cycle, the stream always contains valid results. Note It is not, in general, possible to infer the directions of the signals from the implementation—here, ready and valid have different directions and different intended uses, but they look similar to the Amaranth implementation since they are both undriven in the component. This RFC proposes a way of describing signal directions that can be applied to any Python object. In addition to elaboratables, it includes Python objects that are used to group together signals with a similar purpose, such as those that are parts of a bus. To describe signal directions, only a single addition is needed: the signature property: from amaranth.lib.wiring import Signature, In, Out class SequenceSource(Elaboratable): ... signature = Signature({ \"data\": Out(16), \"ready\": In(1), \"valid\": Out(1) }) Consider another component that is consuming these values: class NumberSink(Elaboratable): ... def elaborate(self): m = Module() processing = Signal() m.d.comb += self.ready.eq(~processing) with m.If(self.valid & ~processing): m.d.sync += processing.eq(1) with m.Elif(processing): ... # process it somehow signature = Signature({ \"data\": In(16), \"ready\": Out(1), \"valid\": In(1) }) Currently, the only way (given the tools provided by the language and the standard library) to connect the output stream of the SequenceSource to the input stream of the NumberSink is to do this signal-wise: m = Module()\nm.submodules.source = source = SequenceSource()\nm.submodules.sink = sink = NumberSink()\nm.d.comb += [ sink.data.eq(source.data), source.ready.eq(sink.ready), sink.valid.eq(source.valid)\n] This is tedious, verbose, and error-prone. It is possible to define an application-specific function abstracting this operation, and many applications do, but something this universal should be defined on the language level. This RFC introduces a way to describe interfaces (collections of directional signals; more on this later) and a single operation: connecting . The code above now transforms into: from amaranth.lib.wiring import connect m = Module()\nm.submodules.source = source = SequenceSource()\nm.submodules.sink = sink = NumberSink()\nconnect(m, sink, source) The order of arguments to connect does not matter as the directionality is defined by the components themselves. It could just as well be written as: connect(m, source, sink) However, this approach still has flaws. Most importantly, the signature for SequenceSource and NumberSink is written twice, but their signature is exactly the same except that the direction is flipped: In members become Out, and vice versa. To avoid error-prone repetition here, the signature can be defined once: Stream16BitSignature = Signature({ \"data\": Out(16), \"ready\": In(1), \"valid\": Out(1)\n}) and then used twice, for both the source and the sink: class SequenceSource(Elaboratable): ... signature = Stream16BitSignature class NumberSink(Elaboratable): ... signature = Stream16BitSignature.flip() The Signature.flip() method returns a flipped signature object : a signature object whose members have inverse direction but which is otherwise identical. Since this approach has reusable signatures defined with a specific direction, it is necessary to make an arbitrary choice: pick the kind of object whose signature will use the non-flipped directions. This RFC picks the object that is the source of data (for stream-like interfaces), the transaction initiator (for bus-like interfaces), and so on to use non-flipped directions by convention. Although some duplication was eliminated, some more remains: currently, it is necessary to define a stream signature for every kind of stream (a stream of 16-bit values, a stream of RGB colors, and so on). It is possible to define a reusable stream signature by inheriting from the Signature class: class StreamSignature(Signature): def __init__(self, payload_shape): super().__init__({ \"payload\": Out(payload_shape), \"ready\": In(1), \"valid\": Out(1) }) The elaboratables above can then be defined as: class SequenceSource(Elaboratable): ... signature = StreamSignature(16) class NumberSink(Elaboratable): ... signature = StreamSignature(16).flip() Usually, elaboratables have more than one interface. For example, a very simple DSP block could sink a stream of signed numbers, take their absolute value, and source a stream of unsigned numbers. It would then have a pair of ready, valid, and payload signals each: one for the input steam, and another for the output stream. To handle this case, signature's members can be signatures themselves. These members also have directionality; an Out signature leaves the directionality of its members unchanged, while an In signature flips it. The signature method of the processing block could be defined as: class AbsoluteProcessor(Elaboratable): ... signature = Signature({ \"i\": In(StreamSignature(signed(16))), \"o\": Out(StreamSignature(unsigned(16))) }) To be compliant with this signature, an AbsoluteProcessor instance must have an i attribute compliant with a StreamSignature(signed(16)).flip(), and an o attribute compliant with a StreamSignature(unsigned(16)). These could be defined manually: class AbsoluteProcessor(Elaboratable): def __init__(self): self.i = object() self.i.payload = Signal(signed(16)) self.i.ready = Signal() self.i.valid = Signal() self.i.signature = StreamSignature(signed(16)).flip() self.o = object() self.o.payload = Signal(unsigned(16)) self.o.ready = Signal() self.o.valid = Signal() self.o.signature = StreamSignature(unsigned(16)) ... Once more, to reduce error-prone repetition, the Signature class offers a way to define objects just like the ones created above, making the complete definition be: class AbsoluteProcessor(Elaboratable): def __init__(self): self.i = StreamSignature(signed(16)).flip().create() self.o = StreamSignature(unsigned(16)).create() signature = Signature({ \"i\": In(StreamSignature(signed(16))), \"o\": Out(StreamSignature(unsigned(16))) }) ... Signature subclasses can also override the create method to add functionality not present in the base class. For example, a signature for a bus such as Wishbone or AXI could return an instance of a class rather than a simple object(), and include attributes indicating which optional features of the bus are enabled. However, since the interface of AbsoluteProcessor as a whole can itself be described as a signature, it is possible to further shorten it by deriving from component.Component instead of Elaboratable, in which case the attributes will be filled in from the signature automatically: from amaranth.lib.wiring import Component class AbsoluteProcessor(Component): signature = Signature({ \"i\": In(StreamSignature(signed(16))), \"o\": Out(StreamSignature(unsigned(16))) }) def elaborate(self): m = Module() with m.If(self.i.payload > 0): m.d.comb += self.o.payload.eq(self.i.payload) with m.Else(): # Does not overflow, since -(-32768) [least signed(16)] is less # than 65536 [greatest unsigned(16)]. m.d.comb += self.o.payload.eq(-self.i.payload) return m Python variable annotations can also be used in cases like the above, where the signature is the same for every instance of the class (i.e. the component is not parameterized during creation): class AbsoluteProcessor(Component): i: In(StreamSignature(signed(16))) o: Out(StreamSignature(unsigned(16))) def elaborate(self): m = Module() with m.If(self.i.payload > 0): m.d.comb += self.o.payload.eq(self.i.payload) with m.Else(): # Does not overflow, since -(-32768) [least signed(16)] is less # than 65536 [greatest unsigned(16)]. m.d.comb += self.o.payload.eq(-self.i.payload) return m All of the import statements in the code examples above can be replaced with: from amaranth.lib.wiring import * Reference-level explanation This RFC proposes a number of library additions: Adding classes that describe a hierarchy of Amaranth objects (an elaboratable object and the objects containing its interface signals) and ease instantiating such hierarchies. Adding a function that connects such hierarchies to each other. It also introduces a number of technical terms: A component is an Amaranth elaboratable object. An interface (a concept) is a shared boundary across which several Amaranth components exchange data. It is comprised of a set of signals and the invairants that govern their use. An interface object (an implementation of the concept) a Python object that includes: attributes whose value is an Amaranth value-castable, or another interface; a signature attribute whose value is a signature that is compliant with this object; a description of the invariants applying to its use (in form of documentation, testbenches, formal tests, etc.). A signature is a Signature instance describing requirements applicable to a hierarchy of interace objects. A signature member is a Member instance describing requirements applicable to a single attribute of an interface object. Two kinds of signature members exist: port members (requiring the value of the attribute to be a Signal), and interface members (requiring the value of the attribute to be another interface object). An object is compliant with a signature (therefore making it an interface object) if every member of the signature corresponds to an attribute of the object whose value fits the requirements. A single elaboratable object will often have several interfaces; e.g. a peripheral can have a CSR and/or Wishbone bus interface, and a pin interface. However, the elaboratable object itself can be an interface object as well, which makes it easy to convert it to Verilog and use standalone since its signature defines the ports the Verilog module needs to have. Interface description Interfaces are described using an enumeration, amaranth.lib.wiring.Flow, and two classes, amaranth.lib.wiring.Member and amaranth.lib.wiring.Signature: Flow is an enumeration with two values, In and Out. Flow.__call__(arg, **kwargs) forwards to Member(self, arg, **kwargs). Thus, Out(unsigned(16), reset=0x1234) is a shorthand for Member(Flow.Out, unsigned(16), reset=0x1234). flow.flip() flips the value from In to Out and back. A Member(flow, ...) object describes a part of an interface. It is immutable. A Member(flow, shape_castable, reset=reset_value) object describes a port with the given shape and flow direction. The returned Member object has: the .flow property be flow; the .is_port property be True; the .is_signature property be False; the .shape property be shape_castable; the .reset property be reset_value; the .signature property raise TypeError; the .dimensions property be (). A Member(flow, signature) object describes a constituent interface with the given flow direction. If flow is Flow.In, then the actual flow of every port recursively described by signature is the reverse of the stated direction. The returned Member object has: the .flow property be flow; the .is_port property be False; the .is_signature property be True; the .shape property raise TypeError; the .reset property raise TypeError; the .signature property return signature if flow is Out, signature.flip() if flow is In. the .dimensions property be (). member.array(*dimensions) returns a new Member object whose .dimensions property is dimensions, which is any amount of non-negative numbers, and all other properties are the same as those of member. Calling .array() on a member with dimensions prepends the new dimensions before the old ones, for composability. member.flip() returns a new Member object whose .flow property is ~member.flow, and all other properties are the same as those of member. A Signature(...) object describes an interface comprised of named members: ports and nested interfaces (which themselves are described using signature objects). The Signature class can be derived from. Instances of Signature itself are termed anonymous signatures , and instances of derived classes are named signatures . A Signature({\"name\": Member(...)}) object can be constructed from a name to member mapping. signature.members is a mutable mapping that can be used to alter the description of a non-frozen signature. signature.members += {...} adds members from the given mapping to signature.members if the names being added are not already used. Raises NameError otherwise. signature.freeze() (or signature.members.freeze()) prevents any further modifications of signature (and in particular signature.members), enabling the caller to rely on a particular layout. It is applied recursively to constituent interfaces. It returns self to aid assignments in class definition like: class X: signature = Signature({ ... }).freeze() signature.flip() returns a signature where every member is member.flip()ped. The exact object returned is a proxy object that overrides the methods and attributes defined here such that the flow is flipped, and otherwise forwards attribute accesses untouched. That is, signature.x = and signature.flip().x = both define an attribute on the original signature object, and never on the proxy object alone. When calling method signature.f as signature.flip().f, self is the flipped signature. signature.flatten(object) returns an iterator yielding a path, member, value tuples for each of the ports recursively contained in the signature, where: path is a tuple of strings or integers indicating the sequence of attribute or index accesses that were used to retrieve value from object member is the port member corresponding to value, with the flow flipped as appropriate value is a value-castable object corresponding to the port (usually but not always a Signal) signature.is_compliant(object) checks whether an arbitrary Python object is compliant with this signature. To be compliant with a signature: for every member of the signature, the object must have a corresponding attribute if the member is a port, the attribute value must be a value-castable such that Value.cast(object.attr) method returns a Signal or a Const that has the same width and signedness, and for signals, is not reset-less and has the same reset value as the member a warning may be emitted if the .shape of the member and the .shape() of object.attr are not equal if the member is an interface, the attribute value must be compliant with the signature of the member if the member's dimensions are (p, q, ...), the requirements below hold instead for every result of indexing the attribute value with [i][j]... where i in range(p), j in range(q), ... signature.members.create() creates a dictionary of members from it. This is a helper method for the common part of signature.create(). For every member of the signature, the dictionary contains a value equal to: If the member is a port, Signal(member.shape, reset=member.reset). If the member is a signature, member.signature.create() for Out members, and member.signature.flip().create() for In members. signature.create() creates an interface object from this signature. To do this, it calls the constructor of Interface described below. This method is expected to be routinely overridden in Signature subclasses to instantiate subclasses of Interface. All of the methods that can be called on signature can be called on the object returned by signature.flip(), and self in that case is signature.flip(). This means that in a method defined on a subclass of Signature, self can be an instance of that type, or an instance of a different type, FlippedSignature, which implements the flipping behavior. In the rare case where it is useful to determine which one it is, it is possible to use type(self) is amaranth.lib.wiring.FlippedSignature. Any object can be an interface object if it has the appropriate signature property. However, an amaranth.lib.wiring.Interface class is introduced, serving two purposes: instantiating interfaces from an anonymous signature, and serving as a convenient base class for custom interface classes. The Interface class implements only the __init__() method, accepting a signature as a parameter. It assigns self.signature to be that signature, and for each item in signature.members.create() it creates a corresponding attribute on self. Interface connection Interface objects may be connected to each other using the amaranth.lib.wiring.connect(m, *objects) free function. This function connects interface objects that satisfy the following requirements: The set of members (considered by their paths) is exactly the same for each of the objects. For each given path, all members are either signature members or port members. For each given path where all members are port members, the width of every member with the same path is equal, though the exact types of the objects returned by the .shape property may differ. For each given path where all members are port members, the reset values of all members with the same path must match. For each given path where all members are port members, exactly one member has an Out flow. If the In port member is a signal, it is connected to the Out port member with the same path as follows: m.d.comb += input_port.eq(output_port) If the In port member is a constant, no connection is actually made. The Out port member with the same path (if any) must be a constant with the same value. Forwarding interfaces In some cases, an outer elaboratable object creates an inner elaboratable object and exposes an interface of the inner object as its own: class Outer(Component): bus: Out(BusSignature()) def __init__(self): super().__init__() self.inner = Inner() def elaborate(self, platform): m = Module() m.d.comb += [ self.inner.bus.addr.eq(self.bus.addr), self.inner.bus.w_data.eq(self.bus.w_data), self.bus.r_data.eq(self.inner.bus.r_data), # ... ] return m class Inner(Component): bus: Out(BusSignature()) ... In this case, amaranth.lib.wiring.connect(...) won't help, since an output needs to be connected to an output, and an input to an input. An additional function amaranth.lib.wiring.flipped(obj) is added to assist in this case. It returns a proxy object obj_flipped where obj_flipped.signature equals obj.signature.flip(), and everything else is forwarded identically otherwise. So, the Outer.elaborate method can be rewritten as: class Outer(Component): bus: Out(BusSignature()) def __init__(self): super().__init__() self.inner = Inner() def elaborate(self, platform): m = Module() connect(m, flipped(self.bus), self.inner.bus) return m Component definition This RFC in effect introduces a particular kind of elaboratable object: one that has a signature. While connecting an elaboratable as a whole (as opposed to its sub-interfaces) will rarely, if ever, happen, it is still convenient to have an elaboratable define its signature, for three reasons: It is a declaration of intent, separating the signals that are purposefully a part of its interface from ones that just happen to be assigned to attributes, and stating their direction; It simplifies and standardizes assignment of the interface attributes, making the signature property the single source of truth for the module's interface; It makes it easy to convert a single standalone elaboratable to Verilog. To this end, a class amaranth.lib.wiring.Component is introduced: Component.__init__ (typically called as super().__init__()) updates self.__dict__ with the result of self.signature.members.create(). (If there is a name conflict, it raises an error.) Component.signature collects PEP 526 variable annotations in the class's method resolution order chain up to Component, if any, and returns a signature object constructed from these, or raises an error otherwise. The signature object is created per-instance, not per-class, so that it can be safely mutated if this is a part of the workflow. Alternatives and rationale Do nothing. Record will continue to be used alongside the continued proliferation of ad-hoc implementations of similar functionality, and continue to impair the use of Amaranth components together. Replace the amaranth.lib.wiring.connect free function with a function amaranth.hdl.dsl.Module.connect. It is not a function on amaranth.hdl.dsl.Module to avoid privileging the standard interface library over any other library that may be written downstream. At the moment nothing in amaranth.lib is special in any way other than its name, and preserving this is valuable to the author. Naming questions Should amaranth.lib.wiring be called something else, like amaranth.lib.bus or amaranth.lib.component? bus is short, but not every interface is a bus interface; component (or module, really) puts too much emphasis on the things being interfaced, rather than the interfaces (@jfng) i wouldn't want the bus keyword to already be taken in my namespaces (@jfng) I guess my point is mostly that bus is not the opposite of data, but wiring is (@whitequark) I don't like how long \"component\" is (@whitequark) Should Signature.compatible be named something else, like Signature.is_implemented_by, Signature.is_compliant, Signature.complies_with? Signature.compatible misses an is_ and does not look like a query method (@jfng) I mean, \"compatible\" could mean that two signatures could be connected together. when checking if an object is compliant to a signature, directions also matters (@zyp) Signature.complies_with reverses subject and object (@zyp) Signature.is_implemented_by is verbose (@jfng) Should amaranth.lib.wiring.forward be named something else, like amaranth.lib.wiring.forwarded or amaranth.lib.wiring.forwarding or amaranth.lib.wiring.flip or amaranth.lib.wiring.transpose or ``amaranth.lib.wiring.transposeoramaranth.lib.wiring.inner`? having two essentially unrelated operations called flip when one is already confusing is too much (@whitequark) reflective programming is a thing (@zyp) inner(inner(interface)) to flip it back to the original wouldn't make much sense (@zyp) Future work One-to-many connections between interfaces are currently provided only with a fan-out topology: a single interface with output members only can be connected with multiple interfaces with input members only. This avoids the question of what to do with an input that must be driven by multiple outputs. The interface library could be enriched by adding a small amount of fixed fan-in topologies, e.g. wired-OR and wired-AND, specified as a Member() constructor parameter that must match between all of the respective members.","breadcrumbs":"0002-interfaces","id":"2","title":"0002-interfaces"},"3":{"body":"Start Date: 2023-02-27 RFC PR: amaranth-lang/rfcs#3 Amaranth Issue: amaranth-lang/amaranth#756 Enumeration shapes Amendments The behavior described in this RFC was updated by RFC #4 . Summary Allow explicitly specifying shape for enumerations as an alternative to implicitly inferring it. Motivation Hardware development includes a lot of enumerated values, so first class support for enumerations is important, and so is integration with the standard Python mechanisms for specifying enumerations. Amaranth accepts enum.Enum subclasses anywhere a shape is expected, and enum.Enum instances anywhere a value is expected: >>> from amaranth import *\n>>> from enum import Enum\n>>> class Kind(Enum):\n... MUL = 0\n... ADD = 1\n... SUB = 2\n...\n>>> Shape.cast(Kind)\nunsigned(2)\n>>> Value.cast(Kind.SUB)\n(const 2'd2) However, this does not cover an important use case: a enumeration where many values are reserved. For example, if the Kind enumeration above may need to be extended in the future, it would be necessary to reserve space for additional values, which may require additional storage bits. Right now there is no way to specify that Kind should be cast to e.g. unsigned(4). Guide-level explanation The Amaranth standard library module, amaranth.lib.enum can be used as a drop-in replacement for the Python standard library enum module. It exports the same classes as the ones provided by Python's enum (namely Enum, Flag, IntEnum, and IntFlag) and provides the same functionality, adding the possibility of specifying a shape for the enumeration when it is defined: >>> from amaranth.lib.enum import Enum\n>>> class Kind(Enum, shape=unsigned(4)):\n... MUL = 0\n... ADD = 1\n... SUB = 2\n...\n>>> Shape.cast(Kind)\nunsigned(4)\n>>> Value.cast(Kind.SUB)\n(const 4'd2) If the shape= keyword argument is not specified, the enumeration is treated exactly the same as the corresponding standard Python class. If the values specified for the members are not representable with the explicitly provided shape, a warning is emitted: >>> class Funct3(Enum, shape=unsigned(3)):\n... SUB = 8\n...\n:1: RuntimeWarning: Value of enumeration member will be truncated to enumeration shape unsigned(3)\n>>> class Funct3(Enum, shape=unsigned(3)):\n... SUB = -1\n...\n:1: RuntimeWarning: Value of enumeration member is signed, but enumeration shape is unsigned(3) A shape that is specified for a base class will be inherited in subclasses: >>> class Enum3(Enum, shape=unsigned(3)): pass\n...\n>>> class Funct3(Enum3):\n... SUB = 2\n...\n>>> Shape.cast(Funct3)\nunsigned(3) If a enumeration without an explicitly defined shape is used in a concatenation, a warning is emitted: >>> class Kind(Enum):\n... ADD = 1\n...\n>>> Cat(Kind.ADD)\n:1: SyntaxWarning: Argument #1 of Cat() is an enumeration Kind.ADD without a defined shape used in bit vector context; define the enumeration by inheriting from the class in amaranth.lib.enum and specifying the 'shape=' keyword argument\n(cat (const 1'd1)) Reference-level explanation The Amaranth standard library module, amaranth.lib.enum, exports all of the public names of the Python standard library enum module. The EnumMeta class adds the functionality for storing and casting to shapes, and inherits from ShapeCastable. The Enum, Flag, IntEnum, and IntFlag classes in this module derive from enum.Enum, enum.Flag, enum.IntEnum, and enum.IntFlag respectively, and use amaranth.lib.enum.EnumMeta as their metaclass, which makes subclasses of amaranth.lib.enum.Enum, etc be instances of ShapeCastable. When a new amaranth.lib.enum.Enum subclass is defined, amaranth.lib.enum.EnumMeta.__new__ checks that the enumeration members are valid (currently, Amaranth requires these to be integers), and if the shape= argument is provided, stores it in an internal attribute. Importantly, the attribute is only set if the argument is provided, making it possible to distinguish these cases later. It also checks that all of the members can be represented by the given shape. When an amaranth.lib.enum.Enum subclass is cast to a shape, if the internal attribute is set, the shape in it is returned. Otherwise it is cast to a shape using exactly the same logic as what Shape.cast uses for enum.Enum subclasses. When an instance of a enum.Enum subclass is used in a concatenation, and it is not an instance of ShapeCastable, or if it lacks the _amaranth_shape_ attribute, a warning is emitted. This approach avoids a circular dependency between amaranth.hdl.ast and amaranth.lib.enum. Drawbacks Introducing a new standard library module increases the API surface. The names of enumeration base classes are the same as the standard library enumeration base classes, which may be confusing. Deriving from a different class requires changes to the enumeration at its point of definition, meaning that it is not possible to annotate a enum that comes from an external library with an Amaranth shape. Rationale and alternatives Ultimately, this feature boils down to defining an internal variable on an enum, which is then used by Shape.cast and other core Amaranth code. There are a few possible options for doing this. Special class variable: class SomeEnum(enum.Enum): _amaranth_shape_ = unsigned(4) Class decorator: @amaranth.shape(unsigned(4))\nclass SomeEnum(enum.Enum): Class keyword argument (this proposal): class SomeEnum(amaranth.lib.enum.Enum, shape=unsigned(4)): Alternative (1) has the following drawbacks: It is not possible to check that the enumeration members can be represented by the specified shape at the point of definition. It exposes what should be an implementation detail to the user. The documentation for the standard enum module does not specify whether it's OK to use _sunder_ names for one's own purposes, but it would have to be a part of the stable API. Its advantages are: No additional methods or classes in the API surface. _amaranth_shape_ makes it immediately clear what's going on. The variable can be defined on any enum, even an external one. Alternative (2) has the following drawbacks: It's not clear where the shape decorator should be. It can only be applied to enums, but there's no enum-specific namespace in Amaranth core to put it into. SomeEnum would inherit from the standard Enum class and therefore isinstance(SomeEnum, ShapeCastable) would be False unless ShapeCastable.__instancecheck__ is overridden to fix that. Its advantages are: The decorator can be applied to an external enum. Alternative (3) has the drawbacks specified above, and the following advantages: isinstance(SomeEnum, ShapeCastable) naturally works. As a consequence, no additional code is required in the core language. All of the functionality necessary for the feature to work lives in amaranth.lib.enum. The shape argument matches Signal(shape=) (even though no one uses the keyword form) and works the way one would naturally expect. Uses of import enum can be transparently replaced with from amaranth.lib import enum without updating the call sites, making the migration as easy as the other alternatives. Prior art None. Unresolved questions None. Future possibilities None.","breadcrumbs":"0003-enumeration-shapes","id":"3","title":"0003-enumeration-shapes"},"4":{"body":"Start Date: 2023-02-07 RFC PR: amaranth-lang/rfcs#4 Amaranth Issue: amaranth-lang/amaranth#755 Const-castable expressions Summary Define a subset of expressions that are \"const-castable\" and accept them in contexts where currently only integers and enumerations with integer values are accepted. Motivation In certain contexts, Amaranth requires a constant to be used. These contexts are: with m.Case(...):, Value.matches(...), and the value of an enumeration member that is being cast to a value. Currently, only integers and enumeration members with integer values are considered constants. However, this is too limiting. For example, when developing a CPU, one might want to define control signals for several functional units and combine them into instructions, or conversely, match an instruction against a combination of control signals: class Func(Enum): ADD = 0 SUB = 1 class Src(Enum): MEM = 0 REG = 1 class Instr(Enum): ADD = Cat(Func.ADD, Src.MEM) ADDI = Cat(Func.ADD, Src.REG) ... with m.Switch(instr): with m.Case(Cat(Func.ADD, Src.MEM)): ... Currently, all of these cases would produce syntax errors. There is a private Value._as_const method. It is not used internally, however Amaranth developers have started using it due to unmet needs. Removing it without providing a replacement would be disruptive, and will result in downstream codebases defining their own equivalent. Guide-level explanation In any context where a constant is accepted (with m.Case(...):, Value.matches(...), and the value of an enumeration member), a \"const-castable\" expression can be used. The following expressions are const-castable: int; Const; Cat where all operands are const-castable; instance of a Enum subclass where the value is const-castable. A const-castable expression can be converted to a Const using Const.cast: >>> Const.cast(1)\n(const 1'd1)\n>>> Const.cast(Cat(1, 0, 1))\n(const 3'd5)\n>>> Const.cast(Cat(Func.ADD, Src.REG))\n(const 2'd2) Reference-level explanation The Const.cast static method casts its argument to a value and examines it. If it is a Const, it is returned. If it is a const-castable expression, the operands are recursively cast to constants, and the expression is evaluated. The list of const-castable expressions is: Cat The m.Case(...) (through the Switch() constructor) and Value.matches(...) methods accept two kinds of operands: const-castable expressions, or a string containing a bit pattern (a sequence of 0, 1, or - meaning a wildcard). The Shape.cast method accepts enumerations where all members have const-castable expressions as their values. The shape of an enumeration is a shape with the smallest width that can represent the value of any enumeration member. RFC 3 : The EnumMeta.__new__ method accepts enumerations where all members have const-castable expressions as their values. The value of each member is the value of the constant resulting from casting the user-provided expression. Drawbacks A new language-level concept makes it harder to learn the language. Most developers already have an intuitive understanding of which expressions are const-castable. Const.cast shadows an existing Value.cast method since Const inherits from Value. No one is calling Value.cast through the Const.cast binding. Const.cast has a compatible interface (it returns a Value) and performs a similar function (it calls Value.cast first). However, it's not Liskov-compatible. Rationale and alternatives Alternatives: Do not add this functionality. Developers will define their own const-casting functions, continue to rely on the undocumented and private ._as_const() method, or use other workarounds. Make ._as_const() public (i.e. rename it to .as_const()). Add a new Const.cast method (this option). Alternatives (2) and (3) both introduce a new language-level concept, the only difference is in the interface that is used to access it. Alternative (3) fits the language better: Value.cast takes something value-castable and returns a Value, Shape.cast takes something shape-castable and returns a Shape, so Const.cast is a logical addition in that it takes something const-castable and returns a Const. Prior art Rust and C++ provide functionality (const fn and constexpr respectively) for performing computation at compile time, restricted to a strict subset of the full language. In particular, it can be used to initialize constants, which makes it similar to the functionality proposed here. One challenge these languages face is the question of how large the subset should be. Rust in particular started off heavily restricting const fn, where it did not have any control flow. The functionality was gradually introduced later as needed. Unresolved questions None. Future possibilities Expanding the set of const-castable expressions to include arbitrary arithmetic operations. This RFC limits it to the most requested expression, Cat. This simplifies implementation and reduces the likelihood of introducing bugs in the constant evaluation code, most of which would be almost never used.","breadcrumbs":"0004-const-castable-exprs","id":"4","title":"0004-const-castable-exprs"},"5":{"body":"Start Date: 2023-02-07 RFC PR: amaranth-lang/rfcs#5 Amaranth Issue: amaranth-lang/amaranth#754 Remove Const.normalize Summary Remove Const.normalize(value, shape). Motivation From the name it is not clear what it is supposed to achieve (it's truncation and inversion according to the shape) and it does not check types of arguments. We already have Const(value, shape).value and most developers should be aware of it. Having Const.normalize(value, shape) as well provides no benefit over the former. It's also longer. Explanation The Const.normalize method is deprecated (with the suggestion to use Const().value) and removed. Drawbacks Churn. Rationale and alternatives We could keep it. Removing it reduces the API surface and makes the language a bit more elegant. Prior art None. Unresolved questions None. Future possibilities None.","breadcrumbs":"0005-remove-const-normalize","id":"5","title":"0005-remove-const-normalize"},"6":{"body":"Start Date: 2023-05-31 RFC PR: amaranth-lang/rfcs#0006 Amaranth Issue: amaranth-lang/amaranth#681 CRC generator Summary Add a cyclic redundancy check (CRC) generator to the Amaranth standard library. Motivation Computing CRCs is a common requirement in hardware designs as they are used by a range of communication and storage protocols to detect errors and thereby ensure data integrity. Because of the standard structure and typical set of variations used by CRCs, it is readily possible to provide a general-purpose CRC generator in the standard library which should cover the majority of use cases efficiently. See the Wikipedia page on CRCs for more background and use cases. Guide-level explanation The Amaranth standard library includes a generator for a cyclic redundancy check (CRC) module, which can be used to compute and/or validate most common CRCs used by transmission and storage protocols. There are many different CRC algorithms in use, but they can almost all be described by the following parameters: The bit width of the CRC, commonly (but not always) a power of 2, The generator polynomial, represented as an integer where each bit is a 0 or 1 term in a binary-valued polynomial with as many terms as the CRC width, The initial value of the CRC register, commonly non-zero to allow detection of additional 0-valued data words at the start of a message, Whether to process input words least- or most-significant-bit first, allowing the CRC processing order to match the transmission or storage order of the data bits, Whether to flip the final output so that its least-significant-bit becomes the most-significant bit, set for the same reason as reflecting the input when the CRC value will also be transmitted or stored with a certain bit order, What value, if any, to XOR the output bits with before using the CRC value, often used to invert all bits of the output. This set of parameters is commonly known as the Williams or Rocksoft model. For more information, refer to \"A Painless Guide to CRC Error Detection Algorithms\" . For a list of parameters to use for standard CRCs, refer to: reveng 's catalogue, which uses the same parameterisation crcmod 's predefined list, but remove the leading 1 from the polynomials, XOR the \"Init-value\" with \"XOR-out\" to obtain initial_crc, and where Reversed is True, set both ref_in and ref_out to True. CRC Zoo , which only lists polynomials; use the \"explicit +1\" form but remove the leading 1. The CRC algorithms described in the reveng catalogue are also available in the Amaranth standard library in the crc.catalog module. In Amaranth, the crc.Algorithm class holds the parameters that describe a CRC algorithm: crc_width: the bit width of the CRC polynomial: the generator polynomial of the CRC, excluding an implicit leading 1 for the \"x^n\" term initial_crc: the initial value of the CRC, loaded when computation of a new CRC begins reflect_input: if True, input words are bit-reversed so that the least significant bit is processed first reflect_output: if True, the final output is bit-reversed so that its least-significant bit becomes the most-significant bit of output xor_output: a value to XOR the output with The crc.Algorithm class may be constructed manually, but for many commonly used CRC algorithms a predefined instance is available in the crc.catalog module. To fully define a CRC computation, the width of input data words to the CRC must also be specified. This is commonly 8 for processing byte-wise data, but can be any length greater than 0. The combination of a crc.Algorithm and the data_width makes a crc.Parameters instance, for example: from amaranth.lib import crc\nalgo = crc.Algorithm(crc_width=8, polynomial=0x2f, initial_crc=0xff, reflect_input=False, reflect_output=False, xor_output=0xff)\nparams1 = algo(data_width=8)\nparams2 = crc.catalog.CRC8_AUTOSAR(data_width=8) If not specified, the data width defaults to 8 bits. The crc.Parameters class can be used to compute CRCs in software with its compute() method, which is passed an iterable of integer data words and returns the resulting CRC value. from amaranth.lib import crc\nparams = crc.catalog.CRC8_AUTOSAR()\nassert params.compute(b\"123456789\") == 0xdf To generate a hardware CRC module, either call create() on crc.Parameters or manually construct a crc.Processor: from amaranth.lib import crc\nalgo = crc.Algorithm(crc_width=8, polynomial=0x2f, initial_crc=0xff, reflect_input=False, reflect_output=False, xor_output=0xff)\nparams = algo(data_width=8)\ncrc1 = m.submodules.crc1 = crc.Processor(params)\ncrc2 = m.submodules.crc2 = crc.Catalog.CRC8_AUTOSAR().create() The crc.Processor module begins computation of a new CRC whenever its start input is asserted. Input on data is processed whenever valid is asserted, which may occur in the same clock cycle as start. The updated CRC value is available on the crc output on the clock cycle after valid. With the data width set to 1, a traditional bit-serial CRC is implemented for the given polynomial in a Galois-type shift register. For larger values of data width, a similar architecture computes every new bit of the CRC in parallel. The match_detected output signal may be used to validate data that contains a trailing CRC. If the most recently processed word(s) form a valid CRC for all the data processed since start, the CRC register will always contain a fixed value which can be computed in advance, and the match_detected output indicates whether the CRC register currently contains this value. Reference-level explanation The proposed new interface is: A crc.Algorithm class which holds the parameters for a CRC algorithm, all of which are passed to the constructor: crc_width: bit width of the CRC register polynomial: generator polynomial for CRC algorithm initial_crc: initial value of CRC at start of computation reflect_input: if True, input words are bit-reversed reflect_output: if True, output values are bit-reversed xor_output: value to XOR the CRC value with at output crc.Algorithm implements __call__(data_width=) which is used to create a crc.Parameters instance with the specified data width. A crc.Parameters class which is constructed using a crc.Algorithm and a data_width. crc.Parameters has the following methods: compute(data) performs a software CRC computation on data, an iterable of input data words, and returns the CRC value create() returns a crc.Processor instance preconfigured to use these parameters residue() returns the residue value for these parameters, which is the value left in the CRC register after processing an entire valid codeword (data followed by its own valid CRC) algorithm() returns an crc.Algorithm with the same settings as this crc.Parameters instance A crc.Processor class which inherits from Elaboratable and implements the hardware generator A crc.catalog module which contains instances of crc.Algorithm The hardware implementation uses the property that CRCs are linear, and so the new value of any bit of the CRC register can be found as a linear combination of the current state and all the input bits. By expressing the CRC computation as a linear system like this, we can then determine the boolean equation used to update each bit of the CRC in parallel. A software CRC calculator is implemented in Python in order to find these logic equations. The proposed CRC generator is already implemented and available in PR 681 . The docstrings and comments in it should explain its operation to a suitably technical level of detail. Drawbacks Users could always write their own CRC or use an external library; Amaranth does not need to provide one for them. However, since it's a very common requirement that we can satisfy efficiently for a lot of users, it seems reasonable to include in the standard library. Rationale and alternatives As far as I'm aware, the method here is the optimal technique for generating the logic equations required for this combinatorial CRC generation. One alternative to the combinatorial logic equations is to store intermediate values in a lookup table; the table needs to contain a CRC-sized value for every possible input value, and then the computation required is reduced to a table lookup, an XOR, and some bit shifts. For single-byte words this approach may be practical, but it is unlikely to be worthwhile with 16- or 32-bit words. Additionally, the table approach generally requires a latency of 2 cycles (one extra to perform the table lookup). It's possible this would give better timing in some circumstances, but at the cost of block RAM resources and latency. Prior art The specification chosen for the CRC parameters is a popular de-facto standard, and importantly the reveng catalogue lists suitable parameters for a wide range of standard CRCs. This particular implementation was written in 2020 and is extracted (with permission) from a proprietary codebase, where it is used to generate a variety of CRCs on FPGAs. One early public example of using Amaranth to generate CRCs is from Harmon Instruments , also in 2020, which has a similar construction but does not support the full set of CRC parameters. In general, I found many examples of implementations of specific CRCs in other HDLs, but few for generic generators. There are many software libraries for generating CRCs in most programming languages, but as they are not generating hardware their implementation details are not as relevant - small table lookups are popular as the tradeoffs there tend to favour word-at-a-time computations. Unresolved questions No outstanding unresolved questions. Future possibilities The data interface uses start, data, and valid signals. Eventually, this could be replaced with a Stream, once they are finalised. Currently the entire input data word must be valid together; there is no support for masking some bits off. In particular, such a feature could be useful for wide data paths where the underlying CRC computation is byte-wise, for example a 128-bit-wide data stream from a 10GbE MAC where the Ethernet FCS must be computed over individual bytes. However, the implementation complexity is high, the use cases seem more niche, and such a feature could be added in a backwards-compatible later revision. The software CRC computation only supports computing over an entire set of data. It would be possible to offer an API to permit incremental updates and finalisation.","breadcrumbs":"0006-stdlib-crc","id":"6","title":"0006-stdlib-crc"},"7":{"body":"Start Date: 2023-05-11 RFC PR: amaranth-lang/rfcs#8 Amaranth Issue: amaranth-lang/amaranth#772 Aggregate data structure extensibility Summary Provide well-defined extension points for the aggregate data structure library. Motivation RFC 1 introduces the aggregate data structure library, which allows using any shape-castable object as the shape of a field. Layouts do not consider the specific type of the shape-castable object. However, views do, and depending on whether it's a layout, a subclass of an aggregate class (Struct or Union), or any other shape-castable object, behavior differs: >>> from amaranth import *\n>>> from amaranth.lib.data import *\n>>> class S(Struct):\n... x: unsigned(1)\n...\n>>> layout = StructLayout({\n... \"a\": unsigned(1),\n... \"b\": ArrayLayout(unsigned(2), 4),\n... \"c\": S\n... })\n...\n>>> View(layout).a\n(slice (sig $signal) 0:1)\n>>> View(layout).b\n\n>>> View(layout).c\n<__main__.S object at 0x7f53e4693a30> At the moment this behavior is not well-defined and it special-cases the aggregate classes defined in amaranth.lib.data. Guide-level explanation Any shape-castable object can be used as the shape of a field in a layout. This includes another layout. If the object is a callable (provides a __call__ method), then when a view is accessed, the __call__ method will be called with a single argument, the slice of the underlying value, which will be returned by the view. A Layout is a callable that constructs a View from itself and the value. Reference-level explanation The Layout class has a method __call__. layout(value) is equivalent to View(layout, value). The View.__getitem__ method (and by extension View.__getattr__), after extracting a field from the layout, attempts to call field.shape.__call__(value_slice), where value_slice is the slice of the underlying value corresponding to the field. If there is no such method, it iteratively calls as_shape() on field.shape or the result of the previous call to as_shape() until an object is returned that has a __call__ method, or until an instance of Shape is returned. Drawbacks The syntax may be confusing. Using __call__ to implement construction is a widespread pattern in Python. Moreover, Struct and Union are classes, whose __call__ method forwards to __new__, so implementing this behavior would remove the special case for aggregate base classes without additional code. Rationale and alternatives This design is, as far as the author knows, the smallest possible addition that provides the largest possible extensibility and removes all special casing of aggregate base classes. That it requires no additional functionality to be implemented on the aggregate base classes indicates that it fits well into the existing design. Alternatives: Do not do this. Prior art None. Unresolved questions None. Future possibilities None.","breadcrumbs":"0008-aggregate-extensibility","id":"7","title":"0008-aggregate-extensibility"},"8":{"body":"Start Date: 2023-05-11 RFC PR: amaranth-lang/rfcs#9 Amaranth Issue: amaranth-lang/amaranth#771 Constant initialization for shape-castable objects Summary Add an extension point to shape-castable objects, for converting constant initializers (typically Python literals) to Amaranth constant expressions. Motivation RFC 1 specifies that the reset= argument of a View accepts structured data: flt_neg_reset = data.View(float32_layout, reset={\"sign\": 1}) This structured data is internally turned into an integer constant that is supplied to Signal(reset=). This mechanism is not exposed to Amaranth developers. However, this creates a clear unmet need, since at the moment there is no way to turn a layout and a field-to-value mapping into a constant integer for use elsewhere. For example, if a signal is created manually and not through the View, this will not work despite looking reasonable (the layout is shape-castable and can be supplied to Signal): flt_neg_reset_signal = Signal(float32_layout, reset={\"sign\": 1}) Guide-level explanation Shape-castable objects must, in addition to the mandatory .as_shape() method, implement a mandatory .const(value) method to define how a constant initializer (the reset value of a Signal or View) is converted to an Amaranth constant. This method is defined by shape-castable objects to convert arbitrary Python objects into Amaranth constants. For example, if a shape-castable object has complex internal structure, it can accept a dictionary with the values to be filled into various bits of this structure. If Shape implemented ShapeCastable, the method would be defined as def const(self, value): return Const(value, self). The value returned by this method can be a Const or a value-castable object whose .as_value() will return a Const. This method can also be directly called by the developer to construct a constant using a given shape-castable object. Reference-level explanation A method def const(self, obj): is added on ShapeCastable. The Signal(shape, reset=) constructor is changed so that if isinstance(shape, ShapeCastable), then shape.const(reset) is used instead of reset. The .const() instance method is implemented on Layout to accept a Sequence or Mapping instance and returns a View over a Const with a bit pattern that has the fields set to the given values. Overlapping fields are written in the order of iteration of the input. If the field shape is a shape-castable object, then the value for that field is computed using Const.cast(value, field.shape). The .const() method is implemented on the metaclass of Struct and Union as return View(self, self.as_shape().const(obj)). The View(..., reset=) constructor is changed to pass reset through to the Signal() constructor. Drawbacks Additional method on ShapeCastable. It was clear from the beginning that this functionality will likely be necessary, and we are unlikely to ever add more. The reset= argument becomes dependently typed. Rationale and alternatives Given: class Point(Struct): x: 16 y: 16 it is clear that there needs to be some way to go from {\"x\": 123, \"y\": 456} to Cat(C(123, 16), C(456, 16)) without manually writing out the concatenation. There are two main options for this: Implement a new method, such that Point.const({\"x\": 123, \"y\": 456}) returns a constant of some kind (either an int or a Const or a constant-castable expression). Implement an additional .__init__() override, such that Point({\"x\": 123, \"y\": 456}) returns a view that has a constant-castable expression as its target. Option (1) has the benefit of making it clear when downstream code is creating a constant (and expects an argument where the nested data must all be constant), and of minimizing useless wrapping/unwrapping of views that would otherwise happen. It is an explicit type conversion (from a literal to Const). Option (2) avoids introducing new names. It is an implicit type conversion (from a literal to a view, which in this case is Point). In the end, option (1) seems preferable here since implicit type conversions are easy to unintentionally misuse. It also avoids any clashes with proposed RFC 8. Prior art None. Unresolved questions None. Future possibilities None.","breadcrumbs":"0009-const-init-shape-castable","id":"8","title":"0009-const-init-shape-castable"},"9":{"body":"Start Date: 2023-05-11 RFC PR: amaranth-lang/rfcs#10 Amaranth Issue: amaranth-lang/amaranth#770 Move Repl to Value.replicate Summary Replace the standalone Repl(value, count) node with value.replicate(count). Motivation Repl is a rarely used construct (it's mostly useful for manual sign extension). It is currently a first-class entity that has its own AST node and a name in the prelude, mostly for historical reasons (Repl(v, n) is analogous to Verilog's {x{n}}). Repl does not need to be a first-class entity; Repl(x, n) is almost exactly equivalent to Cat(x for x in range(n)). It especially does not need a name in the prelude. Guide-level explanation Use of Repl is deprecated. To replicate a value multiple times, use value.replicate(). Reference-level explanation Direct use of Repl is deprecated. Its implementation is replaced with def Repl(value, count): return Value.cast(value).replicate(count). A function Value.replicate(count) is added. It is implemented as Cat(value for _ in range(count)). The Repl AST node is removed. Drawbacks Churn. The proposed implementation makes Value.replicate valid on left-hand side of assignment, with potentially surprising behavior. However, this can be handled by prohibiting multiple assignment to the same bit of a signal in general. Rationale and alternatives Rationale: Fewer names in the prelude is always good. Unlike with Cat (where Cat() makes sense), Repl does not make sense as a standalone node any more than Part does (and we do not currently export Part). Despite existing by analogy with {x{n}}, it is currently turned into a concatenation before it reaches the Verilog backend anyway , and any future work will have to reconstruct replication from concatenation in any case. Repl being a dedicated node complicates AST processing for no reason. Alternatives: Do not do this. Prior art None. Unresolved questions None. Future possibilities The Verilog backend currently bitblasts what could be a replication. We could detect these and convert them to replications proper. We could detect code like Cat(x, x).eq(0b11) and warn or reject 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Many changes, including bug fixes and documentation improvements can be implemented and reviewed via the normal GitHub pull request workflow. Some changes though are \"substantial\", and we ask that these be put through a bit of a design process and produce a consensus among the Amaranth community. Table of Contents Opening Table of Contents When you need to follow this process Before creating an RFC What the process is The RFC life-cycle Reviewing RFCs Implementing an RFC Acknowledgements License When you need to follow this process You need to follow this process if you intend to make \"substantial\" changes to core Amaranth language . In the future you will need to follow this process for the standard I/O library and the System-on-Chip library as well, but at the moment they are not covered. What constitutes a \"substantial\" change is evolving based on community norms and varies depending on what part of the ecosystem you are proposing to change, but may include the following: Any semantic or syntactic change to the language (amaranth.hdl) that is not a bugfix. Behavioral changes to the standard library (amaranth.lib). Behavioral changes to the toolchain interface (amaranth.vendor). Some changes do not require an RFC: Rephrasing, reorganizing, refactoring, or otherwise \"changing shape does not change meaning\". Additions that strictly improve objective, numerical quality criteria (warning removal, speedup, better platform coverage, handling more errors, etc.) If you submit a pull request to implement a new feature without going through the RFC process, it may be closed with a polite request to submit an RFC first. When in doubt, please open an issue to discuss the feature first and one of the core maintainers will say if the change requires an RFC or not. Before creating an RFC A hastily-proposed RFC can hurt its chances of acceptance. Low quality proposals, proposals for previously-rejected features, or those that don't fit into the near-term roadmap, may be quickly rejected, which can be demotivating for the unprepared contributor. Laying some groundwork ahead of the RFC can make the process smoother. Although there is no single way to prepare for submitting an RFC, it is generally a good idea to pursue feedback from other project developers beforehand, to ascertain that the RFC may be desirable; having a consistent impact on the project requires concerted effort toward consensus-building. The most common preparations for writing and submitting an RFC include talking the idea over on our IRC channel, #amaranth-lang at libera.chat , or opening an issue on the corresponding repository to gather feedback. What the process is In short, to get a major feature added to Amaranth, one must first get the RFC merged into the RFC repository as a markdown file. At that point the RFC is \"active\" and may be implemented with the goal of eventual inclusion into Amaranth. Fork the RFC repository. Copy 0000-template.md to text/0000-my-feature.md (where \"my-feature\" is descriptive). Don't assign an RFC number yet; This is going to be the PR number and we'll rename the file accordingly if the RFC is accepted. Fill in the RFC. Put care into the details: RFCs that do not present convincing motivation, demonstrate lack of understanding of the design's impact, or are disingenuous about the drawbacks or alternatives tend to be poorly-received. Submit a pull request. As a pull request the RFC will receive design feedback from the larger community, and the author should be prepared to revise it in response. Now that your RFC has an open pull request, use the issue number of the PR to update your 0000- prefix to that number. Build consensus and integrate feedback. RFCs that have broad support are much more likely to make progress than those that don't receive any comments. Feel free to reach out to the RFC assignee in particular to get help identifying stakeholders and obstacles. RFCs rarely go through this process unchanged, especially as alternatives and drawbacks are shown. You can make edits, big and small, to the RFC to clarify or change the design, but make changes as new commits to the pull request, and leave a comment on the pull request explaining your changes. Specifically, do not squash or rebase commits after they are visible on the pull request. At some point, a core maintainer will make a decision on the disposition for the RFC (merge, close, or postpone). This step is taken when enough of the tradeoffs have been discussed that the core maintainer is in a position to make a decision. That does not require consensus amongst all participants in the RFC thread (which is usually impossible). However, the argument supporting the disposition on the RFC needs to have already been clearly articulated, and there should not be a strong consensus against that position. The RFC life-cycle Once an RFC becomes \"active\" then authors may implement it and submit the feature as a pull request to the corresponding repository. Being \"active\" is not a rubber stamp, and in particular still does not mean the feature will ultimately be merged; it does mean that in principle all the major stakeholders have agreed to the feature and are amenable to merging it. Furthermore, the fact that a given RFC has been accepted and is \"active\" implies nothing about what priority is assigned to its implementation, nor does it imply anything about whether a developer has been assigned the task of implementing the feature. While it is not necessary that the author of the RFC also write the implementation, it is by far the most effective way to see an RFC through to completion: authors should not expect that other project developers will take on responsibility for implementing their accepted feature. Modifications to \"active\" RFCs can be done in follow-up pull requests. We strive to write each RFC in a manner that it will reflect the final design of the feature; but the nature of the process means that we cannot expect every merged RFC to actually reflect what the end result will be at the time of the next major release. In general, once accepted, RFCs should not be substantially changed. Only very minor changes should be submitted as amendments. More substantial changes should be new RFCs, with a note added to the original RFC. Exactly what counts as a \"very minor change\" is up to the core maintainers to decide. Reviewing RFCs While the RFC pull request is up, the core maintainers may schedule meetings with the author and/or relevant stakeholders to discuss the issues in greater detail, and the topic may be discussed at weekly meetings. In either case a summary from the meeting will be posted back to the RFC pull request. A core maintainer makes final decisions about RFCs after the benefits and drawbacks are well understood. These decisions can be made at any time, but the core maintainer will regularly issue decisions. When a decision is made, the RFC pull request will either be merged or closed. In either case, if the reasoning is not clear from the discussion in thread, the core maintainer will add a comment describing the rationale for the decision. Implementing an RFC Some accepted RFCs represent vital features that need to be implemented right away. Other accepted RFCs can represent features that can wait until some arbitrary developer feels like doing the work. Every accepted RFC has an associated issue tracking its implementation in the corresponding repository. The author of an RFC is not obligated to implement it. Of course, the RFC author (like any other developer) is welcome to post an implementation for review after the RFC has been accepted. If you are interested in working on the implementation for an \"active\" RFC, but cannot determine if someone else is already working on it, feel free to ask (e.g. by leaving a comment on the associated issue). RFC Postponement Some RFC pull requests are tagged with the \"postponed\" label when they are closed (as part of the rejection process). An RFC closed with \"postponed\" is marked as such because we want neither to think about evaluating the proposal nor about implementing the described feature until some time in the future, and we believe that we can afford to wait until then to do so. Postponed pull requests may be re-opened when the time is right. We don't have any formal process for that, you should ask a core maintainer. Usually an RFC pull request marked as \"postponed\" has already passed an informal first round of evaluation, namely the round of \"do we think we would ever possibly consider making this change, as outlined in the RFC pull request, or some semi-obvious variation of it.\" (When the answer to the latter question is \"no\", then the appropriate response is to close the RFC, not postpone it.) Acknowledgements The process described in this document is based on the Rust RFC process . It has been simplified to match the needs of the much smaller Amaranth community; in particular, policy (including the RFC process itself) is not currently defined through the RFC process. License This repository is licensed under the MIT license .","breadcrumbs":"Introduction","id":"0","title":"Introduction"},"1":{"body":"Start Date: 2023-02-14 RFC PR: amaranth-lang/rfcs#1 Amaranth Issue: amaranth-lang/amaranth#748 Aggregate data structure library Amendments The behavior described in this RFC was updated by RFC #8 , RFC #9 , and RFC #15 . Summary Add a rich set of standard library classes for accessing hierarchical aggregate data an idiomatic way, to fill one of the two major use cases of Record while avoiding its downsides. See also RFC #2 . Motivation Amaranth has a single data storage primitive: Signal. A Signal can be referenced on the left hand and the right hand side of an assignment, and so can be its slices. Although a signal serves the role of a numeric and bit container type fine, designs often include signals used as bit containers whose individual bits are named and have unique meanings. A mechanism that allows referring to such bit fields by name is essential. Currently, the role of this mechanism is served by Record. However, Record has multiple major drawbacks: Record attempts to do too much: it is both a mechanism for controlling representation (including implicitly casting a record to a value) and a mechanism for defining interfaces (specifying signal directions and facilitating connections between records). These mechanisms should be defined separately, since the only aspect they have in common is using a container class that consists of multiple named fields. Conflating the two mechanisms constraints the design space, making addressing the other drawbacks impossible, and the ill-defined scope encourages bugs in downstream code. Record has limited composability: records can only be nested within each other. Practical designs (in particular, implementations of protocols) use data with complex representation beyond nested sequences of fields: these include overlaid sequences of fields (where interpretation alternates based on some discriminant) and arrays of fields (where a field can be indexed by a non-constant), where any individual field can have a complex representation itself. Record is structured as a sequence of Signals, which is a part of its API. As such, it cannot support overlaid fields, and implementing support for arrays of fields is challenging. Record has limited introspectability: while its layout member can be accessed to enumerate its fields, the results do not include field boundaries, and the types of the returned shape-castable objects are preserved only as an implementation detail. Layout objects themselves are also not shape-castable. Record and Layout are structured as a sequence of Signals rather than a view into an underlying bit container, which is reflected in its API. Thus, Layout does not fit into Amaranth's data model, which concerns individual values. Record comes with its own storage: while its fields argument can be used to substitute the signals that individual fields are pointing to (in an awkward and error-prone way), it is still a collection of Signals. Using Record to impose structure on an existing Value requires a Module and a combinatorial assignment. This is an unnecessary complication, especially in helper functions. Record does not play well with Python's type annotations. Amaranth developers often inherit from Record as well as Layout, but in both cases the class definition syntax is usually little more than a way to define a callable returning a Record with a specific layout, and provides no benefits for IDE users. Record reserves a lot of names, including commonly used names like connect, any, all, and matches. Conversely, it defines a lot of arithmetic methods that are rarely if ever used on field containers. Layout's DSL is very amorphous. It passes around variable length tuples. The second element of these tuples (the shape) can be another Layout, which is neither a shape nor a shape-castable object. Neither Record nor Layout allow defining fields whose shapes are arbitrary ShapeCastable classes. Since these drawbacks are entrenched in the public API and heavily restrict usefulness of Record as a mechanism for specifying data representation, a new mechanism must replace it. Overview and examples This section shows a bird's eye view of the new syntax and behavior proposed in this RFC. The detailed design is described afterwards. from amaranth import *\nfrom amaranth.lib import data # Declaring a simple structure:\nclass Float32(data.Struct): fraction: unsigned(23) exponent: unsigned(8) sign: unsigned(1) # Defining a signal with the structure above:\nflt_a = Float32() # Reinterpreting an existing value with the same structure:\nflt_b = Float32(Const(0b00111110001000000000000000000000, 32)) # Referencing and updating structure fields by name:\nwith m.If(flt_b.fraction > 0): m.d.comb += [ flt_a.sign.eq(1), flt_a.exponent.eq(127) ] # Declaring a simple union, referencing an existing structure:\nclass FloatOrInt32(data.Union): float: Float32 int: signed(32) # Using the union to bitcast an IEEE754 value from an integer:\nf_or_i = FloatOrInt32()\nis_sub_1 = Signal()\nm.d.comb += [ f_or_i.int.eq(0x41C80000), is_sub_1.eq(f_or_i.float.exponent < 127) # => 1\n] class Op(enum.Enum): ADD = 0 SUB = 1 # Programmatically declaring a structure layout:\nadder_op_layout = data.StructLayout({ \"op\": Op, \"a\": Float32, \"b\": Float32\n}) # Using the layout defined above to define appropriately sized storage...\nadder_op_storage = Signal(adder_op_layout)\nlen(adder_op_storage) # => 65 # ... and wrap it for the fields to be accessible.\nadder_op = data.View(adder_op_layout, adder_op_storage)\nm.d.comb += [ adder_op.op.eq(Op.SUB), adder_op.a.eq(flt_a), adder_op.b.eq(flt_b)\n] Detailed design This RFC proposes a number of language and library additions: Adding a ShapeCastable interface, similar to ValueCastable; Adding classes that hierarchically describe representation of aggregate values: named field containers with non-overlapping fields (structs), named field containers with overlapping fields (unions), and indexed field containers (arrays); Adding a wrapper class that accepts a Value (or a ValueCastable object) and provides accessors that slice it according to the corresponding aggregate representation; Adding an ergonomic and IDE-compatible interface for building descriptions of non-parametric layouts of aggregate values. User-defined shape-castable objects ShapeCastable is an interface for defining Shape-like values outside of the core Amaranth language. It is functionally identical to ValueCastable, and could be used like: from amaranth import * class Layout(ShapeCastable): def __init__(self, fields): self.fields = fields def as_shape(self): return unsigned(sum(len(field) for field in self.fields)) Value layout descriptions Aggregate value layouts are represented using two classes: amaranth.lib.data.Field and amaranth.lib.data.Layout: A Field(shape_castable, offset=0) object describes a field of the given shape starting at bit number offset of the aggregate value. A Layout() object describes an abstract aggregate value. It can be iterated, returning (name, field) or (index, field) pairs; or indexed (__getitem__) by the name or index of the field. It has a .size in bits, determined by the type of the layout, and is shape-castable, being converted to unsigned(layout.size()). A StructLayout(members={\"name\": shape_castable}) object describes an aggregate value with non-overlapping named fields (struct). The fields are placed at offsets such that they immediately follow one another, from least significant to most significant. A UnionLayout(members={\"name\": shape_castable}) object describes an aggregate value with overlapping named fields (union). The fields are placed at offset 0. An ArrayLayout(element=shape_castable, length=1) object describes an aggregate value with indexed fields (array). The fields all have identical shape and are placed at offsets such that they immediately follow one another, from least significant to most significant. A FlexibleLayout(fields={\"name\": field, 0: field}, size=16) object describes a aggregate value with fields arbitrarily placed within its bounds. The representation of a discriminated union could be programmatically constructed as follows: import enum\nfrom amaranth.lib import data class Kind(enum.Enum): ONE_SIGNED = 0 TWO_UNSIGNED = 1 layout = data.StructLayout({ \"kind\": Kind, \"value\": data.UnionLayout({ \"one_signed\": signed(2), \"two_unsigned\": data.ArrayLayout(unsigned(1), 2) })\n}) Aggregate value access Aggregate values are manipulated through the amaranth.lib.data.View class. A View(layout, value_castable) object wraps a value-castable object (which may be a valid assignment target) and provides access to fields according to the layout. A view is itself value-castable, being converted to the object it's wrapping. If the view is wrapping a valid assignment target, then the accessors also return a valid assignment target. Fields can be accessed using either __getitem__ (for both named and indexed fields) or __getattr__ (for named fields). To avoid name collisions when using __getattr__ to access fields, views do not define any non-reserved attributes of their own except for the .as_value() casting method. Field names starting with _ are reserved as attribute names and and can only be accessed using the view[\"name\"] indexing syntax. When a view is used to access a field whose shape is an ordinary Shape object, the accessor returns a Value of the corresponding shape that slices the viewed object. When a view is used to access a field whose shape is an aggregate value layout, the accessor returns another View with this layout, wrapping the slice of the viewed object. For fields that have any other shape-castable object set as their shape, the behavior is the same as for the Shape case. Views that have an ArrayLayout as their layout can be indexed with a Value. In this case, the viewed object is sliced with Value.word_select. A signal can be manipulated with its structure viewed as the discriminated union defined above as follows: # creates an unsigned(3) signal by shape-casting `layout`\nsig = Signal(layout)\nview = data.View(layout, sig) # if the second argument is omitted, a signal with the right shape is created internally;\n# the line below is equivlent to the two lines above\nview = data.View(layout) m = Module()\nm.d.comb += [ view.kind.eq(Kind.TWO_UNSIGNED), view.value.two_unsigned[0].eq(1),\n] Ergonomic layout definition Rather than using the underlying StructLayout and UnionLayout classes, struct and union layouts can be defined using the Python class definition syntax, with the shapes of the members specified using the PEP 526 variable annotations: class SomeVariant(data.Struct): class Value(data.Union): one_signed: signed(2) two_unsigned: data.ArrayLayout(unsigned(1), 2) kind: Kind value: Value # this class can be used in the same way as a `data.View` without needing to specify the layout:\nview2 = SomeVariant()\nm.d.comb += [ view2.kind.eq(Kind.ONE_SIGNED), view2.value.eq(view.value)\n] When they refer to other structures or unions defined in the same way, the variable annotations are also valid PEP 484 type hints, and will be used by IDEs to derive types of properties and expressions. Otherwise, the annotations will be opaque to IDEs or type checkers, but are still useful for a human reader. The classes defined in this way are shape-castable and can be used anywhere a shape or a aggregate value layout is accepted: sig2 = Signal(SomeVariant)\nlayout2 = data.StructLayout({ \"ready\": unsigned(1), \"payload\": SomeVariant\n}) Implementation note: This can be achieved by using a custom metaclass for Struct and Union that inherits from ShapeCastable. If an explicit Layout object is nevertheless needed (e.g. for introspection), it can be extracted from the class using Layout.cast: layout == data.Layout.cast(SomeVariant) # => True Conversely, the shape-castable object defining the layout of a View (which might be a Layout subclass or a Struct/Union subclass) can be extracted from the view using Layout.of: SomeVariant is data.Layout.of(view2) # => True Advanced usage: Parametric layouts The ergonomic definitions using the Struct and Union base classes are concise and integrated with Python type annotations. However, they cannot be used if the layout of an aggregate value is parameterized. In this case, a class with similar functionality can be defined in a more explicit way: class Stream8b10b(data.View): data: Signal ctrl: Signal def __init__(self, value=None, *, width: int): super().__init__(data.StructLayout({ \"data\": unsigned(8 * width), \"ctrl\": unsigned(width) }), value) len(Stream8b10b(width=1).data) # => 8\nlen(Stream8b10b(width=4).data) # => 32 Since the parametric class name itself does not have a fixed layout, it cannot be used with Layout.cast. Similarly, the type annotations cannot include specific field widths; they are included only to indicate the presence of a corresponding attribute to IDEs and type checkers. Structure field ordering The fields of a structure layout object are ordered from least significant to most significant: float32_layout = data.StructLayout({ \"fraction\": unsigned(23), # bits 0..22 \"exponent\": unsigned(8), # bits 23..30 \"sign\": unsigned(1) # bit 31\n}) class Float32(data.Struct): fraction: unsigned(23) # bits 0..22 exponent: unsigned(8) # bits 23..30 sign: unsigned(1) # bit 31 In other words, the following identity holds: float32_storage = Signal(float32_layout)\nfloat32 = data.View(float32_layout, float32_storage) float32_storage == Cat(float32.fraction, float32_layout.exponent, float32.sign) Customizing the automatically created Signal When a view is instantiated without an explicit view target, it creates a Signal with a shape matching the view layout. The View constructor accepts all of the Signal constructor keyword arguments and passes them along; the reset= argument accepts a struct or an array (according to the type of the layout): flt_neg_reset = data.View(float32_layout, reset={\"sign\": 1}) flt_reset_less = Float32(reset_less=True) Drawbacks This feature introduces a language-level concept, shape-castable objects, increasing language complexity. This feature introduces a finely grained hierarchy of 5 similar and related classes for describing layouts. Alternatives Do nothing. Record will continue to be used alongside the continued proliferation of ad-hoc implementations of similar functionality. Remove ArrayLayout from this proposal. The array functionality is niche and introduces the complexity of handling by-index accessors alongside by-name ones. Remove ArrayLayout, UnionLayout, and FlexibleLayout from this proposal. Their functionality is less commonly used than that of StructLayout and introduces the substantial complexity of handling fields at arbitrary offsets. (This would make amaranth.lib.data useless for slicing CSRs in Amaranth SoC.) This change would bring this proposal close to the original PackedStruct proposal discussed in https://github.com/amaranth-lang/amaranth/issues/342. Combine the Layout and all of its derivative classes into a single Layout(fields={\"name\": Field(...), 0: Field(...)}) class that provides a superset of the functionality. This simplifies the API, but makes introspection of aggregate layouts very difficult and can be inefficient if large arrays are used. In this case, factory methods of the Layout class would be provided for more convenient construction of regular struct, union, and array layouts. Remove Struct and Union annotation-driven definition syntax. This makes the API simpler, less redundant, and with fewer corner cases, also avoiding the use of variable annotations that are not valid PEP 484 type hints, at the cost of a continued jarring experience for IDE users. Include a more concise and less visually noisy way to build StructLayout and UnionLayout objects (or their equivalents) using a builder pattern. This may make the syntax slightly nicer, though the RFC author could not come up with anything that would actually be such. Bikeshedding The names of the Field, *Layout, and View classes could be changed to something better. IrregularLayout was renamed to FlexibleLayout. Future work This feature could be improved in several ways that are not in scope of this RFC: StructLayout, UnionLayout, and ArrayLayout could be extended to generate layouts with padding at the end (for structs and unions) or between elements (for arrays). Currently this requires the use of a FlexibleLayout. StructLayout could be extended to accept a list of fields in addition to a map of field names to values. In this case, it would represent an aggregate value with non-overlapping indexed fields (tuple). Struct and/or StructLayout could be extended to treat certain reserved field names (e.g. \"_1\", \"_2\", ...) as designating padding bits. In this case, the offset of the following fields would be adjusted, and the fields with such names would not appear in the layout. Struct and/or StructLayout could be extended to treat certain reserved field names (e.g. \"_\" for Struct and None for StructLayout) as designating an anonymous inner aggregate. In this case, the members of the anonymous inner aggregate would be possible to access as if they were the members of the outer aggregate. The automatic wrapping of accessed aggregate fields done by View could be extended to call a user-specified cast function rather than hard-coding a check for whether the shape is a Layout. This would allow seamless inclusion of user-defined value-castable types in aggregates. The PEP 484 generics could be used to define layouts parametric over field shapes, using type annotations alone. Since Python does not have type-level integers, layouts parametric over field sizes would still need to be defined explicitly. The struct, union, and enum support could be used as the building blocks to implement first-class discriminated unions. Discriminated unions will also benefit from tuples, described above. ( Suggestion by @lachlansneff.) Acknowledgements @modwizcode , @Kaucasus , and @lachlansneff provided valuable feedback while this RFC was being drafted.","breadcrumbs":"0001-aggregate-data-structures","id":"1","title":"0001-aggregate-data-structures"},"10":{"body":"Start Date: 2023-05-15 RFC PR: amaranth-lang/rfcs#15 Amaranth Issue: amaranth-lang/amaranth#784 Lifting shape-castable objects Summary Make Signal(shape_castable, ...) return shape_castable(Signal(shape_castable.as_shape(), ...)). Motivation When Amaranth was a very new language, it did not have any facilities for ascribing type information to data. It had shapes (width and signedness), and it had special handling for range() in the shape position, as well as enumerations. Back then it made sense to have Signal, the single way to define new storage of any kind, to only operate on values (numbers / bit containers). Today the situation is completely different. Amaranth has first-class support for enumerations in the standard library as well as the standard range of data structures (structs, unions, arrays) via RFC 1 and RFC 3 . It provides extensibility through RFC 8 and RFC 9 . Using the existing hooks alone it is possible to extend Amaranth with rich numeric types (fixed-point, complex, potentially even floating-point), and some of these are very likely to end up in the standard library. All of this new functionality internally wraps a Value. It is so common and useful to initialize e.g. a struct view with a fresh Signal that data.View reexports all of the arguments of the Signal constructors and automatically constructs a Signal if no view target is provided. This works, but ties the two together more than would be ideal, and requires every similar facility to reimplement the functionality itself. What is worse is that it seems to be quite confusing to programmers, since it's not apparent that calling data.View(foo_layout) internally creates a Signal. Furthermore, people want to call Signal(foo_layout) to construct some storage for foo_layout, and that works (foo_layout is shape-castable), but does the wrong thing: the returned object is a Signal, not a data.View. It would make teaching a lot easier if we could draw an equivalence between a Signal and a variable in a general purpose programming language, and between its shape and a type in a general purpose programming language. Then, no matter what shape-castable object it is, the way to make some storage is Signal(x). It will also simplify the internals a fair bit. This change wasn't practical before RFC 8 and RFC 9 laid the groundwork for it, but now it is an obvious extension. Guide-level explanation To include state in a design, use the Signal(shape) constructor, where shape describes the bit layout and possible operations on that state. The reset= argument and the returned value depend on the shape that is provided. If it is signed(N) or unsigned(N) or a built-in enumeration or a range, then a plain Value is returned, and the reset= argument accepts a number, an enumeration member, or a constant. If it is a data.Layout, then a data.View is returned, and the reset= argument accepts a sequence or a mapping, potentially nested for nested layouts. Other shape-castable classes will have their own behavior. Warning The existing syntax for creating a View with a new Signal underlying it will be removed immediately (it has never been in a release) to resolve an ambiguity over the semantics of __call__. Reference-level explanation A method def __call__(self, value): is added on ShapeCastable. It must return Value or a ValueCastable instance with the right shape. (Such a method is opportunistically used by data.View for nested views since RFC 8 , however this RFC makes it mandatory for all shape-castable objects.) The Signal.__call__(shape, ...) method is overridden (on the metaclass) to consider shape. First, a signal is constructed normally with all of the arguments. Afterwards, if shape is a ShapeCastable instance, then shape(signal) is returned. Otherwise signal is returned. Drawbacks Increase in language complexity. More metaclasses. Signal is a final class so this is unlikely to go wrong. A Signal() constructor sometimes returning non-Signal objects can be confusing. Rationale and alternatives There are several arguments in favor of the design: It does not de facto introduce any new methods on protocols, since ShapeCastable.__call__ is expected to be implemented by essentially everyone after RFC 8 . It does not introduce new complexity to Signal.__init__; the logic for handling non-integer reset exists since RFC 9 . It eliminates unnecessary coupling between data.View (and other similar facilities) and Signal(). It is a natural extension of the language and has clear parallels to the notion of variables in other languages. It has been repeatedly requested by users, almost every time someone became familiar with the aggregate data structure design. All of these points are compelling but the last one perhaps the most. The author did not find it a stark enough necessity to introduce themselves but it does seem to be one. Alternatives: Do not do this. The status quo is acceptable. Prior art This RFC brings the semantics of Signal to be very close to semantics of typed variables in other languages. \"Lifting\" in the title of this RFC refers to a concept in functional programming of the same name where a higher order function (Signal, here) is used to generalize an operation over a set of other functions (data.View and other shape-castable objects that implement the __call__ protocol, here). Unresolved questions How does this interact with typechecking? This is a straightforward higher order function so it's probably fine. Future possibilities This RFC is the final one in a chain that started with RFC 1 . Enumerations and ranges could be adjusted such that something other than Value is returned. This creates backwards compatibility concerns though.","breadcrumbs":"0015-lifting-shape-castables","id":"10","title":"0015-lifting-shape-castables"},"11":{"body":"Start Date: 2023-08-22 RFC PR: amaranth-lang/rfcs#18 Amaranth Issue: amaranth-lang/amaranth#873 Reorganize vendor platforms Summary Update amaranth.vendor namespace so that instead of: from amaranth.vendor.lattice_ecp5 import LatticeECP5Platform you would write: from amaranth.vendor import LatticeECP5Platform Motivation Vendor names are ever-changing. Xilinx was bought by AMD and the brand has been phased out. Altera was bought by Intel and the brand has been phased out. SiliconBlue has been bought by Lattice (a long time ago) and the brand has long been phased out but still remains as \"SB\" in SB_LUT primitive name. In addition, we attempt to group FPGA families into a single file, like vendor.lattice_machxo2_3l that has been renamed from vendor.lattice_machxo2. This will likely include another FPGA family as soon as it becomes available. By tying module (and file) names to brand names we create churn. Every Amaranth release so far has included renaming of both platform class names and module names. This causes additional downstream breakage and annoys designers using Amaranth. Guide-level explanation To target your FPGA-based project for a particular FPGA family, import the platform class corresponding to the FPGA family from amaranth.vendor, e.g.: from amaranth.vendor import LatticeECP5Platform Reference-level explanation All of the amaranth.vendor.name modules are renamed to amaranth.vendor._internal_name. Python allows __getattr__ to be present in modules: $ cat >x.py\ndef __getattr__(self, name): return f\"__getattr__({name!r})\"\n$ python\n>>> from x import abc\n>>> abc\n\"__getattr__('abc')\" This allows us to make all the platform classes be present as-if they were defined in the amaranth.vendor modules, while retaining all of the benefits of having them in their own amaranth.vendor._internal_name module, such as lazy loading. Drawbacks Churn. A somewhat unusual loading mechanism could cause confusion. Rationale and alternatives Decoupling marketing/brand names from technical names is increasingly important as Amaranth evolves and supports more FPGA families. It allows us to maintain any internal hierarchy we want without it having any impact on downstream code, which solely operates on names imported from amaranth.vendor. Prior art None. Unresolved questions None. Future possibilities None.","breadcrumbs":"0018-reorganize-vendor-platforms","id":"11","title":"0018-reorganize-vendor-platforms"},"12":{"body":"Start Date: 2023-08-22 RFC PR: amaranth-lang/rfcs#19 Amaranth Issue: amaranth-lang/amaranth#874 Remove amaranth.lib.scheduler Summary Remove amaranth.lib.scheduler and the only class RoundRobin in it. Motivation This module is not used in the sole place for which it was added (Amaranth SoC), it is not especially useful, and it has not undergone proper community review when it was added. Guide-level explanation The module amaranth.lib.scheduler and the sole class RoundRobin in it is removed. To continue using it, copy the contents of the module into your own project. Reference-level explanation The class amaranth.lib.scheduler.RoundRobin is deprecated in Amaranth 0.4 and removed in Amaranth 0.5. Drawbacks Churn. Rationale and alternatives This module is out of place in the standard library. It has not seen much use and is trivially implemented outside of it. Downstream consumers tend to inline the logic anyway. It does not seem like there would be any other uses for the amaranth.lib.scheduler module since any other scheduling algorithm would be more closely tied to the consumer. Unresolved questions None. Future possibilities None.","breadcrumbs":"0019-remove-scheduler","id":"12","title":"0019-remove-scheduler"},"13":{"body":"Start Date: 2023-08-22 RFC PR: amaranth-lang/rfcs#20 Amaranth Issue: amaranth-lang/amaranth#875 Deprecate non-FWFT FIFOs Summary Deprecate non-first-word-fall-through FIFOs. Motivation Currently, FIFOs in amaranth.lib.fifo have two incompatible interfaces: FWFT (first word fallthrough) and non-FWFT. The incompatibility concerns only the read half. FWFT FIFOs have r_data valid when r_rdy is asserted. Non-FWFT FIFOs have r_data valid only after strobing r_en, if the FIFO was empty previously. Non-FWFT interface is awkward and is essentially never used. It is a holdover from Migen and its implementation details that was included for compatibility. There are three downsides to having it: Having non-FWFT FIFOs requires every consumer of the FIFO interface to check for fwft when interacting with the FIFO and either asserting that it is True, or adding a code path to handle it. No one does this. The FWFT interface is directly compatible with streams and allows us to add e.g. r_stream and w_stream to existing FIFOs without adding a wrapper such as stream.FIFO. It also makes any custom FIFOs defined downstream of Amaranth stream-enabled. The notion of FWFT vs non-FWFT FIFOs is confusing and difficult to understand. E.g. the author of this RFC wrote both lib.fifo and the Glasgow FIFO code, and she misused the fwft argument in the latter. Guide-level and reference-level explanation In the next version, instantiating SyncFIFO(fwft=False) emits a deprecation warning. In addition, FIFOInterface's fwft parameter now defaults to True. Other FIFOs have no non-FWFT variant in the first place. In the version after that, there is no way to instantiate SyncFIFO(fwft=False). The feature and all references to it are removed in their entirety. Implementation considerations At the moment, SyncFIFOBuffered is implemented as a register in the output of SyncFIFO(fwft=False). The implementation will need to be rewritten. Drawbacks Churn. There will be no alternative to SyncFIFO(fwft=False). Rationale and alternatives It is feasible to extract SyncFIFO(fwft=False) into its own module that may be used by downstream code that needs non-FWFT FIFOs. It would not implement FIFOInterface. There is no reason the SyncFIFO class could not be copied into downstream code as it is. It is possible to wrap FIFOs in the stream library in a way that ensures only FWFT FIFOs are used. Let's not create pointless wrappers. Prior art Not relevant. Unresolved questions None. Future possibilities This RFC primarily exists to enable better stream interface integration.","breadcrumbs":"0020-deprecate-non-fwft-fifos","id":"13","title":"0020-deprecate-non-fwft-fifos"},"14":{"body":"Start Date: 2023-08-22 RFC PR: amaranth-lang/rfcs#21 Patch releases Summary Change Amaranth versioning from major.minor to major.minor.patch after version 0.4, and define the backport policy for patch releases. Motivation Amaranth 0.3 was released on 2021-12-16; almost two years ago. Several important bugs have been fixed in main since, most notably depending on a version of Jinja2 that is no longer installable. At the moment the policy is to issue only major.minor releases, which was OK in the early days but no longer fits the project. We should change the policy that is used for the next Amaranth release and later ones. Explanation Amaranth feature releases all have the version of major.minor.0. The policy for these releases is unchanged and is tied to our two-step process for making breaking changes. In addition to these releases, Amaranth now has bug-fix releases with the major.minor.patch versions. These are intended to address the need of the community to have bugs fixed before a next feature release can be made, and the policy is designed to minimize developer time spent on them. Bug-fix releases are made when all of the following conditions are satisfied: There is an issue that is fixed in the main branch. A member of the community requests this issue to be fixed in a point release. It is possible to fix the issue such that there is a high degree of confidence that the change will not break existing code using Amaranth with a ~=major.minor version constraint. A community member steps up to backport the fix to the release branch. This could be one of the Amaranth maintainers, or anyone else. Amaranth maintainers have no obligation to back-port any fix. Drawbacks This creates additional work for maintainers. Rationale and alternatives It would be possible to backport all feasible fixes as a policy. This would significantly increase maintainer workload. It is possible to keep the current policy. Because we do not control all of the upstream dependencies (including Python), this seems untenable. Prior art Rust has an even stricter bug-fix release policy: the Rust project only issues patch releases in cases of security issues, widespread miscompilations, or unintentional breaking changes. Unresolved questions Should Amaranth SoC adopt the same policy? Future possibilities Eventually, Amaranth may gain release engineers who will maintain long-living release branches.","breadcrumbs":"0021-patch-releases","id":"14","title":"0021-patch-releases"},"15":{"body":"Start Date: 2023-08-22 RFC PR: amaranth-lang/rfcs#22 Amaranth Issue: amaranth-lang/amaranth#876 Define ValueCastable.shape() Summary Require value-castable objects to have a method that returns their high-level shape. Motivation RFC #15 advanced the extensibility of the language significantly, but broke constructs like Signal.like(Signal(data.StructLayout(...))). In addition, not having a well-defined point for returning the high-level shape (i.e. a shape-castable object from which this value-castable object was creaed rather than a Shape instance) causes workarounds such as data.Layout.of to be added to the language and standard library. Explanation The ValueCastable interface has a method .shape(). This method returns a shape-castable object. Where possibe, this object should, when passed to Signal, create a value-castable object of the same type. amaranth.lib.data.Layout.of is removed immediately. Drawbacks Increased API surface area At one point a commitment was made that the only method ValueCastable will ever define will be as_value. However, radical changes to the language such as RFC #15 make it reasonable to revisit this. Rationale and alternatives This change is the minimal possible one that fixes the problem systemically. Some minor variations in the design are possible: Instead of requiring shape() to be defined (which is a breaking change), this method can be added optionally in the next release and be required in the release after that. This is difficult to do with ValueCastable and will require workarounds both in the core language implementation and in downstream code that operates on ValueCastable objects. ValueCastable is not very widely used yet and the breakage will likely be minimal. Prior art It is typical for a programming language to have a way of retrieving the type of a value. The mechanism being added here is equivalent. Unresolved questions None. Future possibilities None.","breadcrumbs":"0022-valuecastable-shape","id":"15","title":"0022-valuecastable-shape"},"16":{"body":"Start Date: 2023-10-30 RFC PR: amaranth-lang/rfcs#0028 Amaranth Issue: amaranth-lang/amaranth#0929 Allow overriding Value operators Summary Allow overriding binary Value operators with reflected operators in a value-castable type. Motivation A value-castable type can define operators that return another value-castable. However, if the left side operand is a Value, its operator will be called first, casting the right side operand to a plain Value. This creates a mismatch in behavior depending on the type and order of operands. As an example, consider the multiplication of a fixed point value-castable with an integral type: >>> Q(7).const(0.5) * 255\n(fixedpoint Q8.7 (* (const 8'sd64) (const 8'd255)))\n>>> 255 * Q(7).const(0.5)\n(fixedpoint Q8.7 (* (const 8'sd64) (const 8'd255)))\n>>> Q(7).const(0.5) * C(255)\n(fixedpoint Q8.7 (* (const 8'sd64) (const 8'd255)))\n>>> C(255) * Q(7).const(0.5)\n(* (const 8'd255) (const 8'sd64)) Explanation When a binary Value operator is called with a value-castable other, check whether the value-castable implements the reflected variant of the operator first and defer to it when present. Drawbacks Extra logic required around every Value operator. Prior art This is standard behavior for inheritance in Python : Note: If the right operand’s type is a subclass of the left operand’s type and that subclass provides a different implementation of the reflected method for the operation, this method will be called before the left operand’s non-reflected method. This behavior allows subclasses to override their ancestors’ operations. We don't get this behavior automatically because Value is not an ancestor of ValueCastable, but it would make sense for it to behave as it were. Rationale and alternatives As an alternative, Value and ValueCastable could be rearchitected so that ValueCastable inherits from either Value or a common base that implements the Value operators. This would make Python do the right thing w.r.t. operator overriding, but is a larger change with more potential for undesirable consequences. Unresolved questions None. Future possibilities Value.eq() could in the same manner check for and defer to a .req() method, i.e. reflected .eq(), to allow a value-castable to override how assignment from it to a Value is handled.","breadcrumbs":"0028-override-value-operators","id":"16","title":"0028-override-value-operators"},"17":{"body":"Start Date: 2023-11-27 RFC PR: amaranth-lang/rfcs#31 Amaranth Issue: amaranth-lang/amaranth#972 Enumeration type safety Summary Make Amaranth Enum and Flag use a custom ValueCastable view class, enforcing type safety. Motivation Python Enum provides an opaque wrapper over the underlying enum values, providing type safety and guarding against improper usage in arithmetic operations: >>> from enum import Enum\n>>> class EnumA(Enum):\n... A = 0\n... B = 1\n...\n>>> EnumA.A + 1\nTraceback (most recent call last): File \"\", line 1, in \nTypeError: unsupported operand type(s) for +: 'EnumA' and 'int' Likewise, Flag values can be used in bitwise operations, but only within their own type: >>> from enum import Flag\n>>> class FlagA(Flag):\n... A = 1\n... B = 2\n... >>> class FlagB(Flag):\n... C = 1\n... D = 2\n... >>> FlagA.A | FlagA.B\n\n>>> FlagA.A | FlagB.C\nTraceback (most recent call last): File \"\", line 1, in \nTypeError: unsupported operand type(s) for |: 'FlagA' and 'FlagB' However, these safety properties are not currently enforced by Amaranth on enum-typed signals: >>> from amaranth import *\n>>> from amaranth.lib.enum import *\n>>> class FlagA(Flag):\n... A = 1\n... B = 2\n... >>> class FlagB(Flag):\n... C = 1\n... D = 2\n... >>> a = Signal(FlagA)\n>>> b = Signal(FlagB)\n>>> a | b\n(| (sig a) (sig b)) Guide-level explanation Like in Python, Enum and Flag subclasses are considered strongly-typed, while IntEnum and IntFlag are weakly-typed. Enum-typed Amaranth values with strong typing are manipulated through amaranth.lib.enum.EnumView and amaranth.lib.enum.FlagView classes, which wrap an underlying Value in a type-safe container that only allows a small subset of operations. For weakly-typed enums, Value is used directly, providing full interchangeability with other values. An EnumView or a FlagView can be obtained by: Creating an enum-typed signal (a = Signal(MyEnum)) Explicitly casting a value to the enum type (MyEnum(value)) The operations available on EnumView and FlagView include: Comparing for equality to another view of the same enum type (a == b and a != b) Assigning to or from a value Converting to a plain value via Value.cast The operations additionally available on FlagView include: Binary bitwise operations with another FlagView of the same type (a | b, a & b, a ^ b) Bitwise inversion (~a) A custom subclass of EnumView or FlagView can be used for a given enum type if so desired, by using the view_class keyword parameter on enum creation. Reference-level explanation amaranth.lib.enum.EnumView is a ValueCastable subclass. The following operations are defined on it: EnumView(enum, value_castable): creates the view shape(): returns the underlying enum as_value(): returns the underlying value eq(value_castable): delegates to eq on the underlying value __eq__ and __ne__: if the other argument is an EnumView of the same enum type or a value of the enum type, delegates to the corresponding Value operator; otherwise, raises a TypeError All binary arithmetic, bitwise, and remaining comparison operators: raise a TypeError (to override the implementation provided by Value in case of an operation between EnumView and Value) amaranth.lib.enum.FlagView is a subclass of EnumView. The following additional operations are defined on it: __and__, __or__, __xor__: if the other argument is a FlagView of the same enum type or a value of the enum type, delegates to the corresponding Value operator and wraps the result in FlagView; otherwise, raises a TypeError __invert__: inverts all bits in this value corresponding to actually defined flags in the underlying enum type, then wraps the result in FlagView The behavior of EnumMeta.__call__ when called on a value-castable is changed as follows: If the enum has been created with a view_class, the value-castable is wrapped in the given class Otherwise, if the enum type is a subclass of IntEnum or IntFlag, the value-castable is returned as a plain Value Otherwise, if the enum type is a subclass of Flag, the value-castable is wrapped in FlagView Otherwise, the value-castable is wrapped in EnumView The behavior of EnumMeta.const is modified to go through the same logic. Drawbacks This proposal increases language complexity, and is not consistent with eg. how amaranth.lib.data.View operates (which has much more lax type checking). Rationale and alternatives Do nothing. Operations on mismatched types will continue to be silently allowed. Equality could work more like Python equality (always returning false for mismatched types). Assignment could be made strongly-typed as well (with corresponding hook added to Value). Prior art This feature directly parallels the differences between Python's Enum/Flag and IntEnum/IntFlag. Unresolved questions Instead of having an extension point via view_class, we could instead automatically forward all otherwise unknown methods to the underlying enum class, providing it the EnumView as self. Future possibilities None.","breadcrumbs":"0031-enumeration-type-safety","id":"17","title":"0031-enumeration-type-safety"},"18":{"body":"Start Date: 2023-12-04 RFC PR: amaranth-lang/rfcs#34 Amaranth Issue: amaranth-lang/amaranth#985 Rename amaranth.lib.wiring.Interface to PureInterface Summary The Interface class in amaranth.lib.wiring is renamed to PureInterface, to avoid the impression that it is used for all interfaces. Motivation The current naming of the Interface class wrongly suggests that it is the base class to be used for all interfaces, and that isinstance(foo, Interface) is a valid check for an interface. However, this is in stark contrast to how lib.wiring works: any object can be an interface, as long as it has a signature property and compliant members. This misleads users (and, on at least two occasions, amaranth developers), making them write buggy code. Additionally, the naming makes spoken language ambiguous in a bad way, as it is impossible to tell apart \"an interface\" and \"an Interface\". Therefore, this RFC proposes to rename Interface to something more specific and reflecting its function. Guide-level explanation The Interface class in amaranth.lib.wiring is renamed to PureInterface. Reference-level explanation The Interface class in amaranth.lib.wiring is renamed to PureInterface. Drawbacks Minor churn. Rationale and alternatives The new name is, of course, subject to bikeshedding. The names that have been proposed are: PureInterface BareInterface Prior art None. Unresolved questions None. Future possibilities The name Interface that has just been freed up can be reused for an ABC-like class representing all valid interfaces.","breadcrumbs":"0034-interface-rename","id":"18","title":"0034-interface-rename"},"19":{"body":"Start Date: 2023-12-04 RFC PR: amaranth-lang/rfcs#35 Amaranth Issue: amaranth-lang/amaranth#986 Add ShapeLike, ValueLike Summary Two special classes are added to the language: ShapeLike and ValueLike. They cannot be constructed, but can be used to determine with isinstance and issubclass to determine whether something can be cast to Shape or a Value, respectively. Motivation As it stands, we have multiple types of objects that can be used as shapes (Shape, ShapeCastable, int, range, EnumMeta) and values (Value, ValueCastable, int, Enum). These types have no common superclass, so there's no easy way to check if an object can be used as a shape or a value, save for actually calling Shape.cast or Value.cast. Introducing ShapeLike and ValueLike provides an idiomatic way to perform such a check. Additionally, when type annotations are in use, there is currently no simple type that can be used for an argument that takes an arbitrary shape- or value-castable object. These new classes provide such a simple type. Guide-level explanation In Amaranth, multiple types of objects can be cast to shapes: actual Shape objects ShapeCastable objects non-negative integers range objects Enum subclasses with const-castable values To check whether an object is of a type that can be cast to a shape, isinstance(obj, ShapeLike) can be used. To check whether a type can be, in general, cast to a shape, issubclass(cls, ShapeLike) can be used. Likewise, multiple types of objects can be cast to values: actual Value objects ValueCastable objects integers values of Enum subclasses with const-castable values To check whether an object is of a type that can be cast to a value, isinstance(obj, ValueLike) can be used. To check whether a type can be, in general, cast to a value, issubclass(cls, ValueLike) can be used. Reference-level explanation A ShapeLike class is provided. It cannot be constructed, and can only be used with isinstance and issubclass, which are overriden by a custom metaclass. issubclass(cls, ShapeLike) returns True for: Shape ShapeCastable and its subclasses int and its subclasses range and its subclasses enum.EnumMeta and its subclasses isinstance(obj, ShapeLike) returns True for: instances of Shape instances of ShapeCastable and its subclasses non-negative int values (and int subclasses) enum.Enum subclasses where every value is a ValueLike Similarly, a ValueLike class is provided. issubclass(cls, ValueLike) returns True for: Value and its subclasses ValueCastable and its subclasses int and its subclasses enum.Enum subclasses where every value is a ValueLike isinstance(obj, ValueLike) returns True iff issubclass(type(obj), ValueLike) returns True. Drawbacks More moving parts in the language. isinstance(obj, ShapeLike) does not actually guarantee that Shape.cast(obj) will succeed — the instance check looks only at surface-level information, and an exception can still be thrown. issubclass(cls, ShapeLike) is, by necessity, even more inaccurate. Rationale and alternatives There are many ways to implement the instance and subclass checks, some more precise (and complex) than others. The semantics described above are a compromise. For isinstance, a simple variant would be to just try Shape.cast or Value.cast and see if it raises an exception. However, this will sometimes result in isinstance(MyShapeCastable(), ShapeLike) returning False, which may be very unintuitive and hide bugs. The check for a valid shape-castable enum described above is an approximation — the actual logic used requires all values of an enum to be const -castable, not just value-castable. However, there is no way to check this without actually invoking Value.cast on the enum members. Prior art Python has the concept of abstract base classes, such as collections.abc.Sequence, which can be used for subclass checking even if they are not actual superclasses of the types involved. ShapeLike and ValueLike are effectively ABCs, though they do not use the actual ABC machinery (due to having custom logic in instance checking). Unresolved questions Should the exact details of the instance and subclass checks be changed? Future possibilities A similar ABC-like class has been proposed for lib.wiring interfaces.","breadcrumbs":"0035-shapelike-valuelike","id":"19","title":"0035-shapelike-valuelike"},"2":{"body":"Start Date: 2023-08-22 RFC PR: amaranth-lang/rfcs#2 Amaranth Issue: amaranth-lang/amaranth#872 Interface definition library RFC Summary Add standard ways of declaring that a component of a design conforms to a particular interface and connecting components with complementary interfaces together, to fill the other of the two major use cases of Record while avoiding its downsides. See also RFC #1 . Motivation Digital designs are composed of densely packed components that communicate with each other using well-defined interfaces. Mechanisms to denote the boundary of a component, to ensure that a component complies to a specified interface, and to make reliable connections between components are essential. Currently, Amaranth provides none of these mechanisms. A component implemented in Amaranth, however well-defined conceptually, has no more external structure than a loose collection of Signals assigned to its attributes; and whether any one of them is a part of the interface or the implementation is up to a guess. Even when an interface is described using amaranth.hdl.rec.Layout, such a description cannot be used to verify even the simplest aspects of compliance, such as presence of fields. Although building components by composing smaller components together is ubiquitous, amaranth.hdl.rec.Layout is not able to compose their interface with the same ease. Connecting components using amaranth.hdl.rec.Record.connect is difficult enough that it sees very little use. Originally, Record was aimed at solving many of these issues. However, it has multiple major drawbacks: Record attempts to do too much: it is both a mechanism for controlling representation (including implicitly casting a record to a value) and a mechanism for defining interfaces (specifying signal directions and facilitating connections between records). These mechanisms should be defined separately, since the only aspect they have in common is using a container class that consists of multiple named fields. Conflating the two mechanisms constraints the design space, making addressing the other drawbacks impossible, and the ill-defined scope encourages bugs in downstream code. Record's model of signal directions is too complex. Because it attempts to model both aggregates with controlled representation and interfaces with defined directionality, every signal can have one of the three directions, the third option being non-directed. While this can be applied in a robust way-- FIRRTL has only one aggregate type that it uses for both purposes--this gives rise to a large combination of features and requires handling many edge cases. Record's model of signal directions is too limited. The two static directionalities it has are the confusingly named \"fanout\" and \"fanin\", which really mean \"from initiator to target\" and \"from target to initiator\". This is insufficient to describe common, straightforward interactions such as two components exchanging streams of data across pairs of identical, complementary endpoints. Records are hard to customize. Records create and hold their signals, only providing the caller with an ability to place caller-created signals into individual fields. Signals often need adjustments: primarily setting a reset value or adding a decoder, but sometimes adding attributes or renaming. These adjustments must be performed at the record creation site, which is burdensome. Record fields can be (apart from sub-records) only plain signals. In many cases, an interface between components carries structured data rather than opaque bit vectors. It is not possible to define inner structure for record fields other than through a sub-record, and using a sub-record for this means that an application-specific endpoint that defines such structure cannot be connected to a generic endpoint that does not. Records are hard to compose. The natural way to define a record is to call the Record constructor with a layout, but this creates the entire layout hierarchy unless parts of it are replaced; and it requires having the layout of the result in advance. Record.connect determines the direction of data flow that it will create by the relative position of the interfaces being connected, with x.connect(y) and y.connect(x) having the oposite polarity of assignments. However, the direction of data flow is defined by the component that exposes the interface. Thus, every call of Record.connect can be done in one of the two very similar ways, one of which is always wrong. Record.connect uses wired-OR to gather the \"fanin\" signals, a feature that exists so that it could be used to connect e.g. Wishbone endpoints together without additional gateware. The assumption that the response signals of inactive endpoints will remain all-zero is, generally, unsound. Record.connect manages connections between interfaces with optional signals at the call site using an include/exclude mechanism. However, the semantics of the non-implemented optional signals are a property of the interface, not the connection. Record and rec.Layout are often used as base classes. The Record.like facility, frequently used because of the poor ergonomics of rec.Layout, loses this information and returns an instance of the base class; rec.Layout does the same when indexed. As a result, there is little value in defining methods and attributes on the subclass, and Record subclasses are little more than a callable computing a layout. Due to the limitations of Record, one might define a plain Python class that exposes compatible attributes. An instance of such a class cannot be compared to a known rec.Layout nor can it be embedded in another Record. Record is value-castable and implements the .eq() protocol. Although useful when all fields are non-directional, using .eq() instead of .connect() when connecting directional interfaces is, generally, unsound. It also reserves commonly used names such as any, all, and matches, and implements arithmetic operations that are rarely if ever used on field containers. rec.Layout's DSL is very amorphous. It passes around variable length tuples. The second element of these tuples (the shape) can be another rec.Layout, which is neither a shape nor a shape-castable object. Since these drawbacks are entrenched in the public API and make Record nearly useless for defining interfaces, a new mechanism must replace it. Outline of the design space Although some HDLs and IRs (Migen, Chisel, FIRRTL, ...) choose to use the same basic aggregate data type to represent structured data and directional interfaces , these mechanisms are in direct conflict. Complex forms of structured data, such as unions, are incompatible with associating directionality independently with every leaf member; and the non-directional nature of stored data requires complicated and error-prone rules when it can become a part of a directional connection. Amaranth, instead, opts to include two superficially similar mechanisms for defining and accessing hierarchical aggregate data: amaranth.lib.data (RFC #1) and amaranth.lib.wiring (this RFC). amaranth.lib.data provides data views that reinterpret bit containers as complex aggregates, and entirely avoids directionality. amaranth.lib.wiring provides signatures that give a concrete shape to signals at component boundaries, and always treats them as directional. When connections are made strictly between an output and a correspondingly named input, interfaces gain a dualistic nature: every connection is made between two interfaces whose port directions are the inverse of each other, and which are identical otherwise. To describe interfaces without repeating oneself, then, one has to pick an arbitrarily preferred directionality (and stick with it). Many interfaces are asymmetric, with data flowing from a source to a sink, or transactions issued from an initiator to a target. Amaranth picks the source or initiator perspective; an interface, examined in isolation, defines as outputs the signals that would be outputs of an initiator (and inputs of a target). Then, when an interface with true (non-flipped) directionality describes a component's output, the same interface with inverse (flipped) directionality symmetrically describes an input. To eliminate the major usability issues with Record.connect, the interface connection mechanism assigns no precedence to interfaces and has no effect on signal directionality; whether a signal is an input or an output depends only on the interface itself. A connection is only made from an output to a matching input, and any other combination is rejected with a diagnostic. This way, connecting a pair of interfaces always leads to the same outcome, regardless of their order. The choice to always treat interface signals as directional and to make their directionality dependent only on the interface itself leaves only one aspect of the design open: when and how interface directionality is flipped. The decisions that determine it affect both ergonomics and soundness. Record.connect in effect gives the programmer an option to flip directionality even when it would create an illegal connection. Conversely, rec.Layout provides no such affordance, even though it is necessary for composing components. To facilitate composing components, the interface's directionality is flipped when it is used as an input, whether a top-level input of a component, or as a constituent of a larger interface. This way, the existing mechanism of annotating the directionality of an interface signal or a module port transparently handles interface composition. Guide-level explanation Amaranth designs are made out of components (Python classes implementing Elaboratable) whose attributes include signals. These signals have directions: \"in\" signals are sampled by the component, while \"out\" signals are driven by it, or left at their reset value, and are provided to be sampled by other components. At the moment, these directions are completely informal, and described in the documentation and/or in the signal name as an i_ or o_ prefix (to make it clearer what the direction is at the point of use, or to disambiguate the ports that would otherwise have identical name): class SequenceSource(Elaboratable): \"\"\" Ports ----- data : Signal(width), out ready : Signal(1), in valid : Signal(1), out \"\"\" def __init__(self, width=16): self.data = Signal(width) self.ready = Signal() self.valid = Signal(reset=1) def elaborate(self, platform): m = Module() with m.If(self.ready): m.d.sync += self.data.eq(self.data + 1) return m The SequenceSource component is implemented as a simple counter producing values for an output stream that is connected to some other component consuming them. On each clock tick, if the consumer is ready , it samples the data (the counter value), and simultaneously with that, the producer advances the data to the next item (the incremented value). Since there is always a next item available and it is ready for consumption on the next clock cycle, the stream always contains valid results. Note It is not, in general, possible to infer the directions of the signals from the implementation—here, ready and valid have different directions and different intended uses, but they look similar to the Amaranth implementation since they are both undriven in the component. This RFC proposes a way of describing signal directions that can be applied to any Python object. In addition to elaboratables, it includes Python objects that are used to group together signals with a similar purpose, such as those that are parts of a bus. To describe signal directions, only a single addition is needed: the signature property: from amaranth.lib.wiring import Signature, In, Out class SequenceSource(Elaboratable): ... signature = Signature({ \"data\": Out(16), \"ready\": In(1), \"valid\": Out(1) }) Consider another component that is consuming these values: class NumberSink(Elaboratable): ... def elaborate(self): m = Module() processing = Signal() m.d.comb += self.ready.eq(~processing) with m.If(self.valid & ~processing): m.d.sync += processing.eq(1) with m.Elif(processing): ... # process it somehow signature = Signature({ \"data\": In(16), \"ready\": Out(1), \"valid\": In(1) }) Currently, the only way (given the tools provided by the language and the standard library) to connect the output stream of the SequenceSource to the input stream of the NumberSink is to do this signal-wise: m = Module()\nm.submodules.source = source = SequenceSource()\nm.submodules.sink = sink = NumberSink()\nm.d.comb += [ sink.data.eq(source.data), source.ready.eq(sink.ready), sink.valid.eq(source.valid)\n] This is tedious, verbose, and error-prone. It is possible to define an application-specific function abstracting this operation, and many applications do, but something this universal should be defined on the language level. This RFC introduces a way to describe interfaces (collections of directional signals; more on this later) and a single operation: connecting . The code above now transforms into: from amaranth.lib.wiring import connect m = Module()\nm.submodules.source = source = SequenceSource()\nm.submodules.sink = sink = NumberSink()\nconnect(m, sink, source) The order of arguments to connect does not matter as the directionality is defined by the components themselves. It could just as well be written as: connect(m, source, sink) However, this approach still has flaws. Most importantly, the signature for SequenceSource and NumberSink is written twice, but their signature is exactly the same except that the direction is flipped: In members become Out, and vice versa. To avoid error-prone repetition here, the signature can be defined once: Stream16BitSignature = Signature({ \"data\": Out(16), \"ready\": In(1), \"valid\": Out(1)\n}) and then used twice, for both the source and the sink: class SequenceSource(Elaboratable): ... signature = Stream16BitSignature class NumberSink(Elaboratable): ... signature = Stream16BitSignature.flip() The Signature.flip() method returns a flipped signature object : a signature object whose members have inverse direction but which is otherwise identical. Since this approach has reusable signatures defined with a specific direction, it is necessary to make an arbitrary choice: pick the kind of object whose signature will use the non-flipped directions. This RFC picks the object that is the source of data (for stream-like interfaces), the transaction initiator (for bus-like interfaces), and so on to use non-flipped directions by convention. Although some duplication was eliminated, some more remains: currently, it is necessary to define a stream signature for every kind of stream (a stream of 16-bit values, a stream of RGB colors, and so on). It is possible to define a reusable stream signature by inheriting from the Signature class: class StreamSignature(Signature): def __init__(self, payload_shape): super().__init__({ \"payload\": Out(payload_shape), \"ready\": In(1), \"valid\": Out(1) }) The elaboratables above can then be defined as: class SequenceSource(Elaboratable): ... signature = StreamSignature(16) class NumberSink(Elaboratable): ... signature = StreamSignature(16).flip() Usually, elaboratables have more than one interface. For example, a very simple DSP block could sink a stream of signed numbers, take their absolute value, and source a stream of unsigned numbers. It would then have a pair of ready, valid, and payload signals each: one for the input steam, and another for the output stream. To handle this case, signature's members can be signatures themselves. These members also have directionality; an Out signature leaves the directionality of its members unchanged, while an In signature flips it. The signature method of the processing block could be defined as: class AbsoluteProcessor(Elaboratable): ... signature = Signature({ \"i\": In(StreamSignature(signed(16))), \"o\": Out(StreamSignature(unsigned(16))) }) To be compliant with this signature, an AbsoluteProcessor instance must have an i attribute compliant with a StreamSignature(signed(16)).flip(), and an o attribute compliant with a StreamSignature(unsigned(16)). These could be defined manually: class AbsoluteProcessor(Elaboratable): def __init__(self): self.i = object() self.i.payload = Signal(signed(16)) self.i.ready = Signal() self.i.valid = Signal() self.i.signature = StreamSignature(signed(16)).flip() self.o = object() self.o.payload = Signal(unsigned(16)) self.o.ready = Signal() self.o.valid = Signal() self.o.signature = StreamSignature(unsigned(16)) ... Once more, to reduce error-prone repetition, the Signature class offers a way to define objects just like the ones created above, making the complete definition be: class AbsoluteProcessor(Elaboratable): def __init__(self): self.i = StreamSignature(signed(16)).flip().create() self.o = StreamSignature(unsigned(16)).create() signature = Signature({ \"i\": In(StreamSignature(signed(16))), \"o\": Out(StreamSignature(unsigned(16))) }) ... Signature subclasses can also override the create method to add functionality not present in the base class. For example, a signature for a bus such as Wishbone or AXI could return an instance of a class rather than a simple object(), and include attributes indicating which optional features of the bus are enabled. However, since the interface of AbsoluteProcessor as a whole can itself be described as a signature, it is possible to further shorten it by deriving from component.Component instead of Elaboratable, in which case the attributes will be filled in from the signature automatically: from amaranth.lib.wiring import Component class AbsoluteProcessor(Component): signature = Signature({ \"i\": In(StreamSignature(signed(16))), \"o\": Out(StreamSignature(unsigned(16))) }) def elaborate(self): m = Module() with m.If(self.i.payload > 0): m.d.comb += self.o.payload.eq(self.i.payload) with m.Else(): # Does not overflow, since -(-32768) [least signed(16)] is less # than 65536 [greatest unsigned(16)]. m.d.comb += self.o.payload.eq(-self.i.payload) return m Python variable annotations can also be used in cases like the above, where the signature is the same for every instance of the class (i.e. the component is not parameterized during creation): class AbsoluteProcessor(Component): i: In(StreamSignature(signed(16))) o: Out(StreamSignature(unsigned(16))) def elaborate(self): m = Module() with m.If(self.i.payload > 0): m.d.comb += self.o.payload.eq(self.i.payload) with m.Else(): # Does not overflow, since -(-32768) [least signed(16)] is less # than 65536 [greatest unsigned(16)]. m.d.comb += self.o.payload.eq(-self.i.payload) return m All of the import statements in the code examples above can be replaced with: from amaranth.lib.wiring import * Reference-level explanation This RFC proposes a number of library additions: Adding classes that describe a hierarchy of Amaranth objects (an elaboratable object and the objects containing its interface signals) and ease instantiating such hierarchies. Adding a function that connects such hierarchies to each other. It also introduces a number of technical terms: A component is an Amaranth elaboratable object. An interface (a concept) is a shared boundary across which several Amaranth components exchange data. It is comprised of a set of signals and the invairants that govern their use. An interface object (an implementation of the concept) a Python object that includes: attributes whose value is an Amaranth value-castable, or another interface; a signature attribute whose value is a signature that is compliant with this object; a description of the invariants applying to its use (in form of documentation, testbenches, formal tests, etc.). A signature is a Signature instance describing requirements applicable to a hierarchy of interace objects. A signature member is a Member instance describing requirements applicable to a single attribute of an interface object. Two kinds of signature members exist: port members (requiring the value of the attribute to be a Signal), and interface members (requiring the value of the attribute to be another interface object). An object is compliant with a signature (therefore making it an interface object) if every member of the signature corresponds to an attribute of the object whose value fits the requirements. A single elaboratable object will often have several interfaces; e.g. a peripheral can have a CSR and/or Wishbone bus interface, and a pin interface. However, the elaboratable object itself can be an interface object as well, which makes it easy to convert it to Verilog and use standalone since its signature defines the ports the Verilog module needs to have. Interface description Interfaces are described using an enumeration, amaranth.lib.wiring.Flow, and two classes, amaranth.lib.wiring.Member and amaranth.lib.wiring.Signature: Flow is an enumeration with two values, In and Out. Flow.__call__(arg, **kwargs) forwards to Member(self, arg, **kwargs). Thus, Out(unsigned(16), reset=0x1234) is a shorthand for Member(Flow.Out, unsigned(16), reset=0x1234). flow.flip() flips the value from In to Out and back. A Member(flow, ...) object describes a part of an interface. It is immutable. A Member(flow, shape_castable, reset=reset_value) object describes a port with the given shape and flow direction. The returned Member object has: the .flow property be flow; the .is_port property be True; the .is_signature property be False; the .shape property be shape_castable; the .reset property be reset_value; the .signature property raise TypeError; the .dimensions property be (). A Member(flow, signature) object describes a constituent interface with the given flow direction. If flow is Flow.In, then the actual flow of every port recursively described by signature is the reverse of the stated direction. The returned Member object has: the .flow property be flow; the .is_port property be False; the .is_signature property be True; the .shape property raise TypeError; the .reset property raise TypeError; the .signature property return signature if flow is Out, signature.flip() if flow is In. the .dimensions property be (). member.array(*dimensions) returns a new Member object whose .dimensions property is dimensions, which is any amount of non-negative numbers, and all other properties are the same as those of member. Calling .array() on a member with dimensions prepends the new dimensions before the old ones, for composability. member.flip() returns a new Member object whose .flow property is ~member.flow, and all other properties are the same as those of member. A Signature(...) object describes an interface comprised of named members: ports and nested interfaces (which themselves are described using signature objects). The Signature class can be derived from. Instances of Signature itself are termed anonymous signatures , and instances of derived classes are named signatures . A Signature({\"name\": Member(...)}) object can be constructed from a name to member mapping. signature.members is a mutable mapping that can be used to alter the description of a non-frozen signature. signature.members += {...} adds members from the given mapping to signature.members if the names being added are not already used. Raises NameError otherwise. signature.freeze() (or signature.members.freeze()) prevents any further modifications of signature (and in particular signature.members), enabling the caller to rely on a particular layout. It is applied recursively to constituent interfaces. It returns self to aid assignments in class definition like: class X: signature = Signature({ ... }).freeze() signature.flip() returns a signature where every member is member.flip()ped. The exact object returned is a proxy object that overrides the methods and attributes defined here such that the flow is flipped, and otherwise forwards attribute accesses untouched. That is, signature.x = and signature.flip().x = both define an attribute on the original signature object, and never on the proxy object alone. When calling method signature.f as signature.flip().f, self is the flipped signature. signature.flatten(object) returns an iterator yielding a path, member, value tuples for each of the ports recursively contained in the signature, where: path is a tuple of strings or integers indicating the sequence of attribute or index accesses that were used to retrieve value from object member is the port member corresponding to value, with the flow flipped as appropriate value is a value-castable object corresponding to the port (usually but not always a Signal) signature.is_compliant(object) checks whether an arbitrary Python object is compliant with this signature. To be compliant with a signature: for every member of the signature, the object must have a corresponding attribute if the member is a port, the attribute value must be a value-castable such that Value.cast(object.attr) method returns a Signal or a Const that has the same width and signedness, and for signals, is not reset-less and has the same reset value as the member a warning may be emitted if the .shape of the member and the .shape() of object.attr are not equal if the member is an interface, the attribute value must be compliant with the signature of the member if the member's dimensions are (p, q, ...), the requirements below hold instead for every result of indexing the attribute value with [i][j]... where i in range(p), j in range(q), ... signature.members.create() creates a dictionary of members from it. This is a helper method for the common part of signature.create(). For every member of the signature, the dictionary contains a value equal to: If the member is a port, Signal(member.shape, reset=member.reset). If the member is a signature, member.signature.create() for Out members, and member.signature.flip().create() for In members. signature.create() creates an interface object from this signature. To do this, it calls the constructor of Interface described below. This method is expected to be routinely overridden in Signature subclasses to instantiate subclasses of Interface. All of the methods that can be called on signature can be called on the object returned by signature.flip(), and self in that case is signature.flip(). This means that in a method defined on a subclass of Signature, self can be an instance of that type, or an instance of a different type, FlippedSignature, which implements the flipping behavior. In the rare case where it is useful to determine which one it is, it is possible to use type(self) is amaranth.lib.wiring.FlippedSignature. Any object can be an interface object if it has the appropriate signature property. However, an amaranth.lib.wiring.Interface class is introduced, serving two purposes: instantiating interfaces from an anonymous signature, and serving as a convenient base class for custom interface classes. The Interface class implements only the __init__() method, accepting a signature as a parameter. It assigns self.signature to be that signature, and for each item in signature.members.create() it creates a corresponding attribute on self. Interface connection Interface objects may be connected to each other using the amaranth.lib.wiring.connect(m, *objects) free function. This function connects interface objects that satisfy the following requirements: The set of members (considered by their paths) is exactly the same for each of the objects. For each given path, all members are either signature members or port members. For each given path where all members are port members, the width of every member with the same path is equal, though the exact types of the objects returned by the .shape property may differ. For each given path where all members are port members, the reset values of all members with the same path must match. For each given path where all members are port members, exactly one member has an Out flow. If the In port member is a signal, it is connected to the Out port member with the same path as follows: m.d.comb += input_port.eq(output_port) If the In port member is a constant, no connection is actually made. The Out port member with the same path (if any) must be a constant with the same value. Forwarding interfaces In some cases, an outer elaboratable object creates an inner elaboratable object and exposes an interface of the inner object as its own: class Outer(Component): bus: Out(BusSignature()) def __init__(self): super().__init__() self.inner = Inner() def elaborate(self, platform): m = Module() m.d.comb += [ self.inner.bus.addr.eq(self.bus.addr), self.inner.bus.w_data.eq(self.bus.w_data), self.bus.r_data.eq(self.inner.bus.r_data), # ... ] return m class Inner(Component): bus: Out(BusSignature()) ... In this case, amaranth.lib.wiring.connect(...) won't help, since an output needs to be connected to an output, and an input to an input. An additional function amaranth.lib.wiring.flipped(obj) is added to assist in this case. It returns a proxy object obj_flipped where obj_flipped.signature equals obj.signature.flip(), and everything else is forwarded identically otherwise. So, the Outer.elaborate method can be rewritten as: class Outer(Component): bus: Out(BusSignature()) def __init__(self): super().__init__() self.inner = Inner() def elaborate(self, platform): m = Module() connect(m, flipped(self.bus), self.inner.bus) return m Component definition This RFC in effect introduces a particular kind of elaboratable object: one that has a signature. While connecting an elaboratable as a whole (as opposed to its sub-interfaces) will rarely, if ever, happen, it is still convenient to have an elaboratable define its signature, for three reasons: It is a declaration of intent, separating the signals that are purposefully a part of its interface from ones that just happen to be assigned to attributes, and stating their direction; It simplifies and standardizes assignment of the interface attributes, making the signature property the single source of truth for the module's interface; It makes it easy to convert a single standalone elaboratable to Verilog. To this end, a class amaranth.lib.wiring.Component is introduced: Component.__init__ (typically called as super().__init__()) updates self.__dict__ with the result of self.signature.members.create(). (If there is a name conflict, it raises an error.) Component.signature collects PEP 526 variable annotations in the class's method resolution order chain up to Component, if any, and returns a signature object constructed from these, or raises an error otherwise. The signature object is created per-instance, not per-class, so that it can be safely mutated if this is a part of the workflow. Alternatives and rationale Do nothing. Record will continue to be used alongside the continued proliferation of ad-hoc implementations of similar functionality, and continue to impair the use of Amaranth components together. Replace the amaranth.lib.wiring.connect free function with a function amaranth.hdl.dsl.Module.connect. It is not a function on amaranth.hdl.dsl.Module to avoid privileging the standard interface library over any other library that may be written downstream. At the moment nothing in amaranth.lib is special in any way other than its name, and preserving this is valuable to the author. Naming questions Should amaranth.lib.wiring be called something else, like amaranth.lib.bus or amaranth.lib.component? bus is short, but not every interface is a bus interface; component (or module, really) puts too much emphasis on the things being interfaced, rather than the interfaces (@jfng) i wouldn't want the bus keyword to already be taken in my namespaces (@jfng) I guess my point is mostly that bus is not the opposite of data, but wiring is (@whitequark) I don't like how long \"component\" is (@whitequark) Should Signature.compatible be named something else, like Signature.is_implemented_by, Signature.is_compliant, Signature.complies_with? Signature.compatible misses an is_ and does not look like a query method (@jfng) I mean, \"compatible\" could mean that two signatures could be connected together. when checking if an object is compliant to a signature, directions also matters (@zyp) Signature.complies_with reverses subject and object (@zyp) Signature.is_implemented_by is verbose (@jfng) Should amaranth.lib.wiring.forward be named something else, like amaranth.lib.wiring.forwarded or amaranth.lib.wiring.forwarding or amaranth.lib.wiring.flip or amaranth.lib.wiring.transpose or ``amaranth.lib.wiring.transposeoramaranth.lib.wiring.inner`? having two essentially unrelated operations called flip when one is already confusing is too much (@whitequark) reflective programming is a thing (@zyp) inner(inner(interface)) to flip it back to the original wouldn't make much sense (@zyp) Future work One-to-many connections between interfaces are currently provided only with a fan-out topology: a single interface with output members only can be connected with multiple interfaces with input members only. This avoids the question of what to do with an input that must be driven by multiple outputs. The interface library could be enriched by adding a small amount of fixed fan-in topologies, e.g. wired-OR and wired-AND, specified as a Member() constructor parameter that must match between all of the respective members.","breadcrumbs":"0002-interfaces","id":"2","title":"0002-interfaces"},"3":{"body":"Start Date: 2023-02-27 RFC PR: amaranth-lang/rfcs#3 Amaranth Issue: amaranth-lang/amaranth#756 Enumeration shapes Amendments The behavior described in this RFC was updated by RFC #4 . Summary Allow explicitly specifying shape for enumerations as an alternative to implicitly inferring it. Motivation Hardware development includes a lot of enumerated values, so first class support for enumerations is important, and so is integration with the standard Python mechanisms for specifying enumerations. Amaranth accepts enum.Enum subclasses anywhere a shape is expected, and enum.Enum instances anywhere a value is expected: >>> from amaranth import *\n>>> from enum import Enum\n>>> class Kind(Enum):\n... MUL = 0\n... ADD = 1\n... SUB = 2\n...\n>>> Shape.cast(Kind)\nunsigned(2)\n>>> Value.cast(Kind.SUB)\n(const 2'd2) However, this does not cover an important use case: a enumeration where many values are reserved. For example, if the Kind enumeration above may need to be extended in the future, it would be necessary to reserve space for additional values, which may require additional storage bits. Right now there is no way to specify that Kind should be cast to e.g. unsigned(4). Guide-level explanation The Amaranth standard library module, amaranth.lib.enum can be used as a drop-in replacement for the Python standard library enum module. It exports the same classes as the ones provided by Python's enum (namely Enum, Flag, IntEnum, and IntFlag) and provides the same functionality, adding the possibility of specifying a shape for the enumeration when it is defined: >>> from amaranth.lib.enum import Enum\n>>> class Kind(Enum, shape=unsigned(4)):\n... MUL = 0\n... ADD = 1\n... SUB = 2\n...\n>>> Shape.cast(Kind)\nunsigned(4)\n>>> Value.cast(Kind.SUB)\n(const 4'd2) If the shape= keyword argument is not specified, the enumeration is treated exactly the same as the corresponding standard Python class. If the values specified for the members are not representable with the explicitly provided shape, a warning is emitted: >>> class Funct3(Enum, shape=unsigned(3)):\n... SUB = 8\n...\n:1: RuntimeWarning: Value of enumeration member will be truncated to enumeration shape unsigned(3)\n>>> class Funct3(Enum, shape=unsigned(3)):\n... SUB = -1\n...\n:1: RuntimeWarning: Value of enumeration member is signed, but enumeration shape is unsigned(3) A shape that is specified for a base class will be inherited in subclasses: >>> class Enum3(Enum, shape=unsigned(3)): pass\n...\n>>> class Funct3(Enum3):\n... SUB = 2\n...\n>>> Shape.cast(Funct3)\nunsigned(3) If a enumeration without an explicitly defined shape is used in a concatenation, a warning is emitted: >>> class Kind(Enum):\n... ADD = 1\n...\n>>> Cat(Kind.ADD)\n:1: SyntaxWarning: Argument #1 of Cat() is an enumeration Kind.ADD without a defined shape used in bit vector context; define the enumeration by inheriting from the class in amaranth.lib.enum and specifying the 'shape=' keyword argument\n(cat (const 1'd1)) Reference-level explanation The Amaranth standard library module, amaranth.lib.enum, exports all of the public names of the Python standard library enum module. The EnumMeta class adds the functionality for storing and casting to shapes, and inherits from ShapeCastable. The Enum, Flag, IntEnum, and IntFlag classes in this module derive from enum.Enum, enum.Flag, enum.IntEnum, and enum.IntFlag respectively, and use amaranth.lib.enum.EnumMeta as their metaclass, which makes subclasses of amaranth.lib.enum.Enum, etc be instances of ShapeCastable. When a new amaranth.lib.enum.Enum subclass is defined, amaranth.lib.enum.EnumMeta.__new__ checks that the enumeration members are valid (currently, Amaranth requires these to be integers), and if the shape= argument is provided, stores it in an internal attribute. Importantly, the attribute is only set if the argument is provided, making it possible to distinguish these cases later. It also checks that all of the members can be represented by the given shape. When an amaranth.lib.enum.Enum subclass is cast to a shape, if the internal attribute is set, the shape in it is returned. Otherwise it is cast to a shape using exactly the same logic as what Shape.cast uses for enum.Enum subclasses. When an instance of a enum.Enum subclass is used in a concatenation, and it is not an instance of ShapeCastable, or if it lacks the _amaranth_shape_ attribute, a warning is emitted. This approach avoids a circular dependency between amaranth.hdl.ast and amaranth.lib.enum. Drawbacks Introducing a new standard library module increases the API surface. The names of enumeration base classes are the same as the standard library enumeration base classes, which may be confusing. Deriving from a different class requires changes to the enumeration at its point of definition, meaning that it is not possible to annotate a enum that comes from an external library with an Amaranth shape. Rationale and alternatives Ultimately, this feature boils down to defining an internal variable on an enum, which is then used by Shape.cast and other core Amaranth code. There are a few possible options for doing this. Special class variable: class SomeEnum(enum.Enum): _amaranth_shape_ = unsigned(4) Class decorator: @amaranth.shape(unsigned(4))\nclass SomeEnum(enum.Enum): Class keyword argument (this proposal): class SomeEnum(amaranth.lib.enum.Enum, shape=unsigned(4)): Alternative (1) has the following drawbacks: It is not possible to check that the enumeration members can be represented by the specified shape at the point of definition. It exposes what should be an implementation detail to the user. The documentation for the standard enum module does not specify whether it's OK to use _sunder_ names for one's own purposes, but it would have to be a part of the stable API. Its advantages are: No additional methods or classes in the API surface. _amaranth_shape_ makes it immediately clear what's going on. The variable can be defined on any enum, even an external one. Alternative (2) has the following drawbacks: It's not clear where the shape decorator should be. It can only be applied to enums, but there's no enum-specific namespace in Amaranth core to put it into. SomeEnum would inherit from the standard Enum class and therefore isinstance(SomeEnum, ShapeCastable) would be False unless ShapeCastable.__instancecheck__ is overridden to fix that. Its advantages are: The decorator can be applied to an external enum. Alternative (3) has the drawbacks specified above, and the following advantages: isinstance(SomeEnum, ShapeCastable) naturally works. As a consequence, no additional code is required in the core language. All of the functionality necessary for the feature to work lives in amaranth.lib.enum. The shape argument matches Signal(shape=) (even though no one uses the keyword form) and works the way one would naturally expect. Uses of import enum can be transparently replaced with from amaranth.lib import enum without updating the call sites, making the migration as easy as the other alternatives. Prior art None. Unresolved questions None. Future possibilities None.","breadcrumbs":"0003-enumeration-shapes","id":"3","title":"0003-enumeration-shapes"},"4":{"body":"Start Date: 2023-02-07 RFC PR: amaranth-lang/rfcs#4 Amaranth Issue: amaranth-lang/amaranth#755 Const-castable expressions Summary Define a subset of expressions that are \"const-castable\" and accept them in contexts where currently only integers and enumerations with integer values are accepted. Motivation In certain contexts, Amaranth requires a constant to be used. These contexts are: with m.Case(...):, Value.matches(...), and the value of an enumeration member that is being cast to a value. Currently, only integers and enumeration members with integer values are considered constants. However, this is too limiting. For example, when developing a CPU, one might want to define control signals for several functional units and combine them into instructions, or conversely, match an instruction against a combination of control signals: class Func(Enum): ADD = 0 SUB = 1 class Src(Enum): MEM = 0 REG = 1 class Instr(Enum): ADD = Cat(Func.ADD, Src.MEM) ADDI = Cat(Func.ADD, Src.REG) ... with m.Switch(instr): with m.Case(Cat(Func.ADD, Src.MEM)): ... Currently, all of these cases would produce syntax errors. There is a private Value._as_const method. It is not used internally, however Amaranth developers have started using it due to unmet needs. Removing it without providing a replacement would be disruptive, and will result in downstream codebases defining their own equivalent. Guide-level explanation In any context where a constant is accepted (with m.Case(...):, Value.matches(...), and the value of an enumeration member), a \"const-castable\" expression can be used. The following expressions are const-castable: int; Const; Cat where all operands are const-castable; instance of a Enum subclass where the value is const-castable. A const-castable expression can be converted to a Const using Const.cast: >>> Const.cast(1)\n(const 1'd1)\n>>> Const.cast(Cat(1, 0, 1))\n(const 3'd5)\n>>> Const.cast(Cat(Func.ADD, Src.REG))\n(const 2'd2) Reference-level explanation The Const.cast static method casts its argument to a value and examines it. If it is a Const, it is returned. If it is a const-castable expression, the operands are recursively cast to constants, and the expression is evaluated. The list of const-castable expressions is: Cat The m.Case(...) (through the Switch() constructor) and Value.matches(...) methods accept two kinds of operands: const-castable expressions, or a string containing a bit pattern (a sequence of 0, 1, or - meaning a wildcard). The Shape.cast method accepts enumerations where all members have const-castable expressions as their values. The shape of an enumeration is a shape with the smallest width that can represent the value of any enumeration member. RFC 3 : The EnumMeta.__new__ method accepts enumerations where all members have const-castable expressions as their values. The value of each member is the value of the constant resulting from casting the user-provided expression. Drawbacks A new language-level concept makes it harder to learn the language. Most developers already have an intuitive understanding of which expressions are const-castable. Const.cast shadows an existing Value.cast method since Const inherits from Value. No one is calling Value.cast through the Const.cast binding. Const.cast has a compatible interface (it returns a Value) and performs a similar function (it calls Value.cast first). However, it's not Liskov-compatible. Rationale and alternatives Alternatives: Do not add this functionality. Developers will define their own const-casting functions, continue to rely on the undocumented and private ._as_const() method, or use other workarounds. Make ._as_const() public (i.e. rename it to .as_const()). Add a new Const.cast method (this option). Alternatives (2) and (3) both introduce a new language-level concept, the only difference is in the interface that is used to access it. Alternative (3) fits the language better: Value.cast takes something value-castable and returns a Value, Shape.cast takes something shape-castable and returns a Shape, so Const.cast is a logical addition in that it takes something const-castable and returns a Const. Prior art Rust and C++ provide functionality (const fn and constexpr respectively) for performing computation at compile time, restricted to a strict subset of the full language. In particular, it can be used to initialize constants, which makes it similar to the functionality proposed here. One challenge these languages face is the question of how large the subset should be. Rust in particular started off heavily restricting const fn, where it did not have any control flow. The functionality was gradually introduced later as needed. Unresolved questions None. Future possibilities Expanding the set of const-castable expressions to include arbitrary arithmetic operations. This RFC limits it to the most requested expression, Cat. This simplifies implementation and reduces the likelihood of introducing bugs in the constant evaluation code, most of which would be almost never used.","breadcrumbs":"0004-const-castable-exprs","id":"4","title":"0004-const-castable-exprs"},"5":{"body":"Start Date: 2023-02-07 RFC PR: amaranth-lang/rfcs#5 Amaranth Issue: amaranth-lang/amaranth#754 Remove Const.normalize Summary Remove Const.normalize(value, shape). Motivation From the name it is not clear what it is supposed to achieve (it's truncation and inversion according to the shape) and it does not check types of arguments. We already have Const(value, shape).value and most developers should be aware of it. Having Const.normalize(value, shape) as well provides no benefit over the former. It's also longer. Explanation The Const.normalize method is deprecated (with the suggestion to use Const().value) and removed. Drawbacks Churn. Rationale and alternatives We could keep it. Removing it reduces the API surface and makes the language a bit more elegant. Prior art None. Unresolved questions None. Future possibilities None.","breadcrumbs":"0005-remove-const-normalize","id":"5","title":"0005-remove-const-normalize"},"6":{"body":"Start Date: 2023-05-31 RFC PR: amaranth-lang/rfcs#0006 Amaranth Issue: amaranth-lang/amaranth#681 CRC generator Summary Add a cyclic redundancy check (CRC) generator to the Amaranth standard library. Motivation Computing CRCs is a common requirement in hardware designs as they are used by a range of communication and storage protocols to detect errors and thereby ensure data integrity. Because of the standard structure and typical set of variations used by CRCs, it is readily possible to provide a general-purpose CRC generator in the standard library which should cover the majority of use cases efficiently. See the Wikipedia page on CRCs for more background and use cases. Guide-level explanation The Amaranth standard library includes a generator for a cyclic redundancy check (CRC) module, which can be used to compute and/or validate most common CRCs used by transmission and storage protocols. There are many different CRC algorithms in use, but they can almost all be described by the following parameters: The bit width of the CRC, commonly (but not always) a power of 2, The generator polynomial, represented as an integer where each bit is a 0 or 1 term in a binary-valued polynomial with as many terms as the CRC width, The initial value of the CRC register, commonly non-zero to allow detection of additional 0-valued data words at the start of a message, Whether to process input words least- or most-significant-bit first, allowing the CRC processing order to match the transmission or storage order of the data bits, Whether to flip the final output so that its least-significant-bit becomes the most-significant bit, set for the same reason as reflecting the input when the CRC value will also be transmitted or stored with a certain bit order, What value, if any, to XOR the output bits with before using the CRC value, often used to invert all bits of the output. This set of parameters is commonly known as the Williams or Rocksoft model. For more information, refer to \"A Painless Guide to CRC Error Detection Algorithms\" . For a list of parameters to use for standard CRCs, refer to: reveng 's catalogue, which uses the same parameterisation crcmod 's predefined list, but remove the leading 1 from the polynomials, XOR the \"Init-value\" with \"XOR-out\" to obtain initial_crc, and where Reversed is True, set both ref_in and ref_out to True. CRC Zoo , which only lists polynomials; use the \"explicit +1\" form but remove the leading 1. The CRC algorithms described in the reveng catalogue are also available in the Amaranth standard library in the crc.catalog module. In Amaranth, the crc.Algorithm class holds the parameters that describe a CRC algorithm: crc_width: the bit width of the CRC polynomial: the generator polynomial of the CRC, excluding an implicit leading 1 for the \"x^n\" term initial_crc: the initial value of the CRC, loaded when computation of a new CRC begins reflect_input: if True, input words are bit-reversed so that the least significant bit is processed first reflect_output: if True, the final output is bit-reversed so that its least-significant bit becomes the most-significant bit of output xor_output: a value to XOR the output with The crc.Algorithm class may be constructed manually, but for many commonly used CRC algorithms a predefined instance is available in the crc.catalog module. To fully define a CRC computation, the width of input data words to the CRC must also be specified. This is commonly 8 for processing byte-wise data, but can be any length greater than 0. The combination of a crc.Algorithm and the data_width makes a crc.Parameters instance, for example: from amaranth.lib import crc\nalgo = crc.Algorithm(crc_width=8, polynomial=0x2f, initial_crc=0xff, reflect_input=False, reflect_output=False, xor_output=0xff)\nparams1 = algo(data_width=8)\nparams2 = crc.catalog.CRC8_AUTOSAR(data_width=8) If not specified, the data width defaults to 8 bits. The crc.Parameters class can be used to compute CRCs in software with its compute() method, which is passed an iterable of integer data words and returns the resulting CRC value. from amaranth.lib import crc\nparams = crc.catalog.CRC8_AUTOSAR()\nassert params.compute(b\"123456789\") == 0xdf To generate a hardware CRC module, either call create() on crc.Parameters or manually construct a crc.Processor: from amaranth.lib import crc\nalgo = crc.Algorithm(crc_width=8, polynomial=0x2f, initial_crc=0xff, reflect_input=False, reflect_output=False, xor_output=0xff)\nparams = algo(data_width=8)\ncrc1 = m.submodules.crc1 = crc.Processor(params)\ncrc2 = m.submodules.crc2 = crc.Catalog.CRC8_AUTOSAR().create() The crc.Processor module begins computation of a new CRC whenever its start input is asserted. Input on data is processed whenever valid is asserted, which may occur in the same clock cycle as start. The updated CRC value is available on the crc output on the clock cycle after valid. With the data width set to 1, a traditional bit-serial CRC is implemented for the given polynomial in a Galois-type shift register. For larger values of data width, a similar architecture computes every new bit of the CRC in parallel. The match_detected output signal may be used to validate data that contains a trailing CRC. If the most recently processed word(s) form a valid CRC for all the data processed since start, the CRC register will always contain a fixed value which can be computed in advance, and the match_detected output indicates whether the CRC register currently contains this value. Reference-level explanation The proposed new interface is: A crc.Algorithm class which holds the parameters for a CRC algorithm, all of which are passed to the constructor: crc_width: bit width of the CRC register polynomial: generator polynomial for CRC algorithm initial_crc: initial value of CRC at start of computation reflect_input: if True, input words are bit-reversed reflect_output: if True, output values are bit-reversed xor_output: value to XOR the CRC value with at output crc.Algorithm implements __call__(data_width=) which is used to create a crc.Parameters instance with the specified data width. A crc.Parameters class which is constructed using a crc.Algorithm and a data_width. crc.Parameters has the following methods: compute(data) performs a software CRC computation on data, an iterable of input data words, and returns the CRC value create() returns a crc.Processor instance preconfigured to use these parameters residue() returns the residue value for these parameters, which is the value left in the CRC register after processing an entire valid codeword (data followed by its own valid CRC) algorithm() returns an crc.Algorithm with the same settings as this crc.Parameters instance A crc.Processor class which inherits from Elaboratable and implements the hardware generator A crc.catalog module which contains instances of crc.Algorithm The hardware implementation uses the property that CRCs are linear, and so the new value of any bit of the CRC register can be found as a linear combination of the current state and all the input bits. By expressing the CRC computation as a linear system like this, we can then determine the boolean equation used to update each bit of the CRC in parallel. A software CRC calculator is implemented in Python in order to find these logic equations. The proposed CRC generator is already implemented and available in PR 681 . The docstrings and comments in it should explain its operation to a suitably technical level of detail. Drawbacks Users could always write their own CRC or use an external library; Amaranth does not need to provide one for them. However, since it's a very common requirement that we can satisfy efficiently for a lot of users, it seems reasonable to include in the standard library. Rationale and alternatives As far as I'm aware, the method here is the optimal technique for generating the logic equations required for this combinatorial CRC generation. One alternative to the combinatorial logic equations is to store intermediate values in a lookup table; the table needs to contain a CRC-sized value for every possible input value, and then the computation required is reduced to a table lookup, an XOR, and some bit shifts. For single-byte words this approach may be practical, but it is unlikely to be worthwhile with 16- or 32-bit words. Additionally, the table approach generally requires a latency of 2 cycles (one extra to perform the table lookup). It's possible this would give better timing in some circumstances, but at the cost of block RAM resources and latency. Prior art The specification chosen for the CRC parameters is a popular de-facto standard, and importantly the reveng catalogue lists suitable parameters for a wide range of standard CRCs. This particular implementation was written in 2020 and is extracted (with permission) from a proprietary codebase, where it is used to generate a variety of CRCs on FPGAs. One early public example of using Amaranth to generate CRCs is from Harmon Instruments , also in 2020, which has a similar construction but does not support the full set of CRC parameters. In general, I found many examples of implementations of specific CRCs in other HDLs, but few for generic generators. There are many software libraries for generating CRCs in most programming languages, but as they are not generating hardware their implementation details are not as relevant - small table lookups are popular as the tradeoffs there tend to favour word-at-a-time computations. Unresolved questions No outstanding unresolved questions. Future possibilities The data interface uses start, data, and valid signals. Eventually, this could be replaced with a Stream, once they are finalised. Currently the entire input data word must be valid together; there is no support for masking some bits off. In particular, such a feature could be useful for wide data paths where the underlying CRC computation is byte-wise, for example a 128-bit-wide data stream from a 10GbE MAC where the Ethernet FCS must be computed over individual bytes. However, the implementation complexity is high, the use cases seem more niche, and such a feature could be added in a backwards-compatible later revision. The software CRC computation only supports computing over an entire set of data. It would be possible to offer an API to permit incremental updates and finalisation.","breadcrumbs":"0006-stdlib-crc","id":"6","title":"0006-stdlib-crc"},"7":{"body":"Start Date: 2023-05-11 RFC PR: amaranth-lang/rfcs#8 Amaranth Issue: amaranth-lang/amaranth#772 Aggregate data structure extensibility Summary Provide well-defined extension points for the aggregate data structure library. Motivation RFC 1 introduces the aggregate data structure library, which allows using any shape-castable object as the shape of a field. Layouts do not consider the specific type of the shape-castable object. However, views do, and depending on whether it's a layout, a subclass of an aggregate class (Struct or Union), or any other shape-castable object, behavior differs: >>> from amaranth import *\n>>> from amaranth.lib.data import *\n>>> class S(Struct):\n... x: unsigned(1)\n...\n>>> layout = StructLayout({\n... \"a\": unsigned(1),\n... \"b\": ArrayLayout(unsigned(2), 4),\n... \"c\": S\n... })\n...\n>>> View(layout).a\n(slice (sig $signal) 0:1)\n>>> View(layout).b\n\n>>> View(layout).c\n<__main__.S object at 0x7f53e4693a30> At the moment this behavior is not well-defined and it special-cases the aggregate classes defined in amaranth.lib.data. Guide-level explanation Any shape-castable object can be used as the shape of a field in a layout. This includes another layout. If the object is a callable (provides a __call__ method), then when a view is accessed, the __call__ method will be called with a single argument, the slice of the underlying value, which will be returned by the view. A Layout is a callable that constructs a View from itself and the value. Reference-level explanation The Layout class has a method __call__. layout(value) is equivalent to View(layout, value). The View.__getitem__ method (and by extension View.__getattr__), after extracting a field from the layout, attempts to call field.shape.__call__(value_slice), where value_slice is the slice of the underlying value corresponding to the field. If there is no such method, it iteratively calls as_shape() on field.shape or the result of the previous call to as_shape() until an object is returned that has a __call__ method, or until an instance of Shape is returned. Drawbacks The syntax may be confusing. Using __call__ to implement construction is a widespread pattern in Python. Moreover, Struct and Union are classes, whose __call__ method forwards to __new__, so implementing this behavior would remove the special case for aggregate base classes without additional code. Rationale and alternatives This design is, as far as the author knows, the smallest possible addition that provides the largest possible extensibility and removes all special casing of aggregate base classes. That it requires no additional functionality to be implemented on the aggregate base classes indicates that it fits well into the existing design. Alternatives: Do not do this. Prior art None. Unresolved questions None. Future possibilities None.","breadcrumbs":"0008-aggregate-extensibility","id":"7","title":"0008-aggregate-extensibility"},"8":{"body":"Start Date: 2023-05-11 RFC PR: amaranth-lang/rfcs#9 Amaranth Issue: amaranth-lang/amaranth#771 Constant initialization for shape-castable objects Summary Add an extension point to shape-castable objects, for converting constant initializers (typically Python literals) to Amaranth constant expressions. Motivation RFC 1 specifies that the reset= argument of a View accepts structured data: flt_neg_reset = data.View(float32_layout, reset={\"sign\": 1}) This structured data is internally turned into an integer constant that is supplied to Signal(reset=). This mechanism is not exposed to Amaranth developers. However, this creates a clear unmet need, since at the moment there is no way to turn a layout and a field-to-value mapping into a constant integer for use elsewhere. For example, if a signal is created manually and not through the View, this will not work despite looking reasonable (the layout is shape-castable and can be supplied to Signal): flt_neg_reset_signal = Signal(float32_layout, reset={\"sign\": 1}) Guide-level explanation Shape-castable objects must, in addition to the mandatory .as_shape() method, implement a mandatory .const(value) method to define how a constant initializer (the reset value of a Signal or View) is converted to an Amaranth constant. This method is defined by shape-castable objects to convert arbitrary Python objects into Amaranth constants. For example, if a shape-castable object has complex internal structure, it can accept a dictionary with the values to be filled into various bits of this structure. If Shape implemented ShapeCastable, the method would be defined as def const(self, value): return Const(value, self). The value returned by this method can be a Const or a value-castable object whose .as_value() will return a Const. This method can also be directly called by the developer to construct a constant using a given shape-castable object. Reference-level explanation A method def const(self, obj): is added on ShapeCastable. The Signal(shape, reset=) constructor is changed so that if isinstance(shape, ShapeCastable), then shape.const(reset) is used instead of reset. The .const() instance method is implemented on Layout to accept a Sequence or Mapping instance and returns a View over a Const with a bit pattern that has the fields set to the given values. Overlapping fields are written in the order of iteration of the input. If the field shape is a shape-castable object, then the value for that field is computed using Const.cast(value, field.shape). The .const() method is implemented on the metaclass of Struct and Union as return View(self, self.as_shape().const(obj)). The View(..., reset=) constructor is changed to pass reset through to the Signal() constructor. Drawbacks Additional method on ShapeCastable. It was clear from the beginning that this functionality will likely be necessary, and we are unlikely to ever add more. The reset= argument becomes dependently typed. Rationale and alternatives Given: class Point(Struct): x: 16 y: 16 it is clear that there needs to be some way to go from {\"x\": 123, \"y\": 456} to Cat(C(123, 16), C(456, 16)) without manually writing out the concatenation. There are two main options for this: Implement a new method, such that Point.const({\"x\": 123, \"y\": 456}) returns a constant of some kind (either an int or a Const or a constant-castable expression). Implement an additional .__init__() override, such that Point({\"x\": 123, \"y\": 456}) returns a view that has a constant-castable expression as its target. Option (1) has the benefit of making it clear when downstream code is creating a constant (and expects an argument where the nested data must all be constant), and of minimizing useless wrapping/unwrapping of views that would otherwise happen. It is an explicit type conversion (from a literal to Const). Option (2) avoids introducing new names. It is an implicit type conversion (from a literal to a view, which in this case is Point). In the end, option (1) seems preferable here since implicit type conversions are easy to unintentionally misuse. It also avoids any clashes with proposed RFC 8. Prior art None. Unresolved questions None. Future possibilities None.","breadcrumbs":"0009-const-init-shape-castable","id":"8","title":"0009-const-init-shape-castable"},"9":{"body":"Start Date: 2023-05-11 RFC PR: amaranth-lang/rfcs#10 Amaranth Issue: amaranth-lang/amaranth#770 Move Repl to Value.replicate Summary Replace the standalone Repl(value, count) node with value.replicate(count). Motivation Repl is a rarely used construct (it's mostly useful for manual sign extension). It is currently a first-class entity that has its own AST node and a name in the prelude, mostly for historical reasons (Repl(v, n) is analogous to Verilog's {x{n}}). Repl does not need to be a first-class entity; Repl(x, n) is almost exactly equivalent to Cat(x for x in range(n)). It especially does not need a name in the prelude. Guide-level explanation Use of Repl is deprecated. To replicate a value multiple times, use value.replicate(). Reference-level explanation Direct use of Repl is deprecated. Its implementation is replaced with def Repl(value, count): return Value.cast(value).replicate(count). A function Value.replicate(count) is added. It is implemented as Cat(value for _ in range(count)). The Repl AST node is removed. Drawbacks Churn. The proposed implementation makes Value.replicate valid on left-hand side of assignment, with potentially surprising behavior. However, this can be handled by prohibiting multiple assignment to the same bit of a signal in general. Rationale and alternatives Rationale: Fewer names in the prelude is always good. Unlike with Cat (where Cat() makes sense), Repl does not make sense as a standalone node any more than Part does (and we do not currently export Part). Despite existing by analogy with {x{n}}, it is currently turned into a concatenation before it reaches the Verilog backend anyway , and any future work will have to reconstruct replication from concatenation in any case. Repl being a dedicated node complicates AST processing for no reason. Alternatives: Do not do this. Prior art None. Unresolved questions None. Future possibilities The Verilog backend currently bitblasts what could be a replication. We could detect these and convert them to replications proper. 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Many changes, including bug fixes and documentation improvements can be implemented and reviewed via the normal GitHub pull request workflow. Some changes though are \"substantial\", and we ask that these be put through a bit of a design process and produce a consensus among the Amaranth community. Table of Contents Opening Table of Contents When you need to follow this process Before creating an RFC What the process is The RFC life-cycle Reviewing RFCs Implementing an RFC Acknowledgements License When you need to follow this process You need to follow this process if you intend to make \"substantial\" changes to core Amaranth language . In the future you will need to follow this process for the standard I/O library and the System-on-Chip library as well, but at the moment they are not covered. What constitutes a \"substantial\" change is evolving based on community norms and varies depending on what part of the ecosystem you are proposing to change, but may include the following: Any semantic or syntactic change to the language (amaranth.hdl) that is not a bugfix. Behavioral changes to the standard library (amaranth.lib). Behavioral changes to the toolchain interface (amaranth.vendor). Some changes do not require an RFC: Rephrasing, reorganizing, refactoring, or otherwise \"changing shape does not change meaning\". Additions that strictly improve objective, numerical quality criteria (warning removal, speedup, better platform coverage, handling more errors, etc.) If you submit a pull request to implement a new feature without going through the RFC process, it may be closed with a polite request to submit an RFC first. When in doubt, please open an issue to discuss the feature first and one of the core maintainers will say if the change requires an RFC or not. Before creating an RFC A hastily-proposed RFC can hurt its chances of acceptance. Low quality proposals, proposals for previously-rejected features, or those that don't fit into the near-term roadmap, may be quickly rejected, which can be demotivating for the unprepared contributor. Laying some groundwork ahead of the RFC can make the process smoother. Although there is no single way to prepare for submitting an RFC, it is generally a good idea to pursue feedback from other project developers beforehand, to ascertain that the RFC may be desirable; having a consistent impact on the project requires concerted effort toward consensus-building. The most common preparations for writing and submitting an RFC include talking the idea over on our IRC channel, #amaranth-lang at libera.chat , or opening an issue on the corresponding repository to gather feedback. What the process is In short, to get a major feature added to Amaranth, one must first get the RFC merged into the RFC repository as a markdown file. At that point the RFC is \"active\" and may be implemented with the goal of eventual inclusion into Amaranth. Fork the RFC repository. Copy 0000-template.md to text/0000-my-feature.md (where \"my-feature\" is descriptive). Don't assign an RFC number yet; This is going to be the PR number and we'll rename the file accordingly if the RFC is accepted. Fill in the RFC. Put care into the details: RFCs that do not present convincing motivation, demonstrate lack of understanding of the design's impact, or are disingenuous about the drawbacks or alternatives tend to be poorly-received. Submit a pull request. As a pull request the RFC will receive design feedback from the larger community, and the author should be prepared to revise it in response. Now that your RFC has an open pull request, use the issue number of the PR to update your 0000- prefix to that number. Build consensus and integrate feedback. RFCs that have broad support are much more likely to make progress than those that don't receive any comments. Feel free to reach out to the RFC assignee in particular to get help identifying stakeholders and obstacles. RFCs rarely go through this process unchanged, especially as alternatives and drawbacks are shown. You can make edits, big and small, to the RFC to clarify or change the design, but make changes as new commits to the pull request, and leave a comment on the pull request explaining your changes. Specifically, do not squash or rebase commits after they are visible on the pull request. At some point, a core maintainer will make a decision on the disposition for the RFC (merge, close, or postpone). This step is taken when enough of the tradeoffs have been discussed that the core maintainer is in a position to make a decision. That does not require consensus amongst all participants in the RFC thread (which is usually impossible). However, the argument supporting the disposition on the RFC needs to have already been clearly articulated, and there should not be a strong consensus against that position. The RFC life-cycle Once an RFC becomes \"active\" then authors may implement it and submit the feature as a pull request to the corresponding repository. Being \"active\" is not a rubber stamp, and in particular still does not mean the feature will ultimately be merged; it does mean that in principle all the major stakeholders have agreed to the feature and are amenable to merging it. Furthermore, the fact that a given RFC has been accepted and is \"active\" implies nothing about what priority is assigned to its implementation, nor does it imply anything about whether a developer has been assigned the task of implementing the feature. While it is not necessary that the author of the RFC also write the implementation, it is by far the most effective way to see an RFC through to completion: authors should not expect that other project developers will take on responsibility for implementing their accepted feature. Modifications to \"active\" RFCs can be done in follow-up pull requests. We strive to write each RFC in a manner that it will reflect the final design of the feature; but the nature of the process means that we cannot expect every merged RFC to actually reflect what the end result will be at the time of the next major release. In general, once accepted, RFCs should not be substantially changed. Only very minor changes should be submitted as amendments. More substantial changes should be new RFCs, with a note added to the original RFC. Exactly what counts as a \"very minor change\" is up to the core maintainers to decide. Reviewing RFCs While the RFC pull request is up, the core maintainers may schedule meetings with the author and/or relevant stakeholders to discuss the issues in greater detail, and the topic may be discussed at weekly meetings. In either case a summary from the meeting will be posted back to the RFC pull request. A core maintainer makes final decisions about RFCs after the benefits and drawbacks are well understood. These decisions can be made at any time, but the core maintainer will regularly issue decisions. When a decision is made, the RFC pull request will either be merged or closed. In either case, if the reasoning is not clear from the discussion in thread, the core maintainer will add a comment describing the rationale for the decision. Implementing an RFC Some accepted RFCs represent vital features that need to be implemented right away. Other accepted RFCs can represent features that can wait until some arbitrary developer feels like doing the work. Every accepted RFC has an associated issue tracking its implementation in the corresponding repository. The author of an RFC is not obligated to implement it. Of course, the RFC author (like any other developer) is welcome to post an implementation for review after the RFC has been accepted. If you are interested in working on the implementation for an \"active\" RFC, but cannot determine if someone else is already working on it, feel free to ask (e.g. by leaving a comment on the associated issue). RFC Postponement Some RFC pull requests are tagged with the \"postponed\" label when they are closed (as part of the rejection process). An RFC closed with \"postponed\" is marked as such because we want neither to think about evaluating the proposal nor about implementing the described feature until some time in the future, and we believe that we can afford to wait until then to do so. Postponed pull requests may be re-opened when the time is right. We don't have any formal process for that, you should ask a core maintainer. Usually an RFC pull request marked as \"postponed\" has already passed an informal first round of evaluation, namely the round of \"do we think we would ever possibly consider making this change, as outlined in the RFC pull request, or some semi-obvious variation of it.\" (When the answer to the latter question is \"no\", then the appropriate response is to close the RFC, not postpone it.) Acknowledgements The process described in this document is based on the Rust RFC process . It has been simplified to match the needs of the much smaller Amaranth community; in particular, policy (including the RFC process itself) is not currently defined through the RFC process. License This repository is licensed under the MIT license .","breadcrumbs":"Introduction","id":"0","title":"Introduction"},"1":{"body":"Start Date: 2023-02-14 RFC PR: amaranth-lang/rfcs#1 Amaranth Issue: amaranth-lang/amaranth#748 Aggregate data structure library Amendments The behavior described in this RFC was updated by RFC #8 , RFC #9 , and RFC #15 . Summary Add a rich set of standard library classes for accessing hierarchical aggregate data an idiomatic way, to fill one of the two major use cases of Record while avoiding its downsides. See also RFC #2 . Motivation Amaranth has a single data storage primitive: Signal. A Signal can be referenced on the left hand and the right hand side of an assignment, and so can be its slices. Although a signal serves the role of a numeric and bit container type fine, designs often include signals used as bit containers whose individual bits are named and have unique meanings. A mechanism that allows referring to such bit fields by name is essential. Currently, the role of this mechanism is served by Record. However, Record has multiple major drawbacks: Record attempts to do too much: it is both a mechanism for controlling representation (including implicitly casting a record to a value) and a mechanism for defining interfaces (specifying signal directions and facilitating connections between records). These mechanisms should be defined separately, since the only aspect they have in common is using a container class that consists of multiple named fields. Conflating the two mechanisms constraints the design space, making addressing the other drawbacks impossible, and the ill-defined scope encourages bugs in downstream code. Record has limited composability: records can only be nested within each other. Practical designs (in particular, implementations of protocols) use data with complex representation beyond nested sequences of fields: these include overlaid sequences of fields (where interpretation alternates based on some discriminant) and arrays of fields (where a field can be indexed by a non-constant), where any individual field can have a complex representation itself. Record is structured as a sequence of Signals, which is a part of its API. As such, it cannot support overlaid fields, and implementing support for arrays of fields is challenging. Record has limited introspectability: while its layout member can be accessed to enumerate its fields, the results do not include field boundaries, and the types of the returned shape-castable objects are preserved only as an implementation detail. Layout objects themselves are also not shape-castable. Record and Layout are structured as a sequence of Signals rather than a view into an underlying bit container, which is reflected in its API. Thus, Layout does not fit into Amaranth's data model, which concerns individual values. Record comes with its own storage: while its fields argument can be used to substitute the signals that individual fields are pointing to (in an awkward and error-prone way), it is still a collection of Signals. Using Record to impose structure on an existing Value requires a Module and a combinatorial assignment. This is an unnecessary complication, especially in helper functions. Record does not play well with Python's type annotations. Amaranth developers often inherit from Record as well as Layout, but in both cases the class definition syntax is usually little more than a way to define a callable returning a Record with a specific layout, and provides no benefits for IDE users. Record reserves a lot of names, including commonly used names like connect, any, all, and matches. Conversely, it defines a lot of arithmetic methods that are rarely if ever used on field containers. Layout's DSL is very amorphous. It passes around variable length tuples. The second element of these tuples (the shape) can be another Layout, which is neither a shape nor a shape-castable object. Neither Record nor Layout allow defining fields whose shapes are arbitrary ShapeCastable classes. Since these drawbacks are entrenched in the public API and heavily restrict usefulness of Record as a mechanism for specifying data representation, a new mechanism must replace it. Overview and examples This section shows a bird's eye view of the new syntax and behavior proposed in this RFC. The detailed design is described afterwards. from amaranth import *\nfrom amaranth.lib import data # Declaring a simple structure:\nclass Float32(data.Struct): fraction: unsigned(23) exponent: unsigned(8) sign: unsigned(1) # Defining a signal with the structure above:\nflt_a = Float32() # Reinterpreting an existing value with the same structure:\nflt_b = Float32(Const(0b00111110001000000000000000000000, 32)) # Referencing and updating structure fields by name:\nwith m.If(flt_b.fraction > 0): m.d.comb += [ flt_a.sign.eq(1), flt_a.exponent.eq(127) ] # Declaring a simple union, referencing an existing structure:\nclass FloatOrInt32(data.Union): float: Float32 int: signed(32) # Using the union to bitcast an IEEE754 value from an integer:\nf_or_i = FloatOrInt32()\nis_sub_1 = Signal()\nm.d.comb += [ f_or_i.int.eq(0x41C80000), is_sub_1.eq(f_or_i.float.exponent < 127) # => 1\n] class Op(enum.Enum): ADD = 0 SUB = 1 # Programmatically declaring a structure layout:\nadder_op_layout = data.StructLayout({ \"op\": Op, \"a\": Float32, \"b\": Float32\n}) # Using the layout defined above to define appropriately sized storage...\nadder_op_storage = Signal(adder_op_layout)\nlen(adder_op_storage) # => 65 # ... and wrap it for the fields to be accessible.\nadder_op = data.View(adder_op_layout, adder_op_storage)\nm.d.comb += [ adder_op.op.eq(Op.SUB), adder_op.a.eq(flt_a), adder_op.b.eq(flt_b)\n] Detailed design This RFC proposes a number of language and library additions: Adding a ShapeCastable interface, similar to ValueCastable; Adding classes that hierarchically describe representation of aggregate values: named field containers with non-overlapping fields (structs), named field containers with overlapping fields (unions), and indexed field containers (arrays); Adding a wrapper class that accepts a Value (or a ValueCastable object) and provides accessors that slice it according to the corresponding aggregate representation; Adding an ergonomic and IDE-compatible interface for building descriptions of non-parametric layouts of aggregate values. User-defined shape-castable objects ShapeCastable is an interface for defining Shape-like values outside of the core Amaranth language. It is functionally identical to ValueCastable, and could be used like: from amaranth import * class Layout(ShapeCastable): def __init__(self, fields): self.fields = fields def as_shape(self): return unsigned(sum(len(field) for field in self.fields)) Value layout descriptions Aggregate value layouts are represented using two classes: amaranth.lib.data.Field and amaranth.lib.data.Layout: A Field(shape_castable, offset=0) object describes a field of the given shape starting at bit number offset of the aggregate value. A Layout() object describes an abstract aggregate value. It can be iterated, returning (name, field) or (index, field) pairs; or indexed (__getitem__) by the name or index of the field. It has a .size in bits, determined by the type of the layout, and is shape-castable, being converted to unsigned(layout.size()). A StructLayout(members={\"name\": shape_castable}) object describes an aggregate value with non-overlapping named fields (struct). The fields are placed at offsets such that they immediately follow one another, from least significant to most significant. A UnionLayout(members={\"name\": shape_castable}) object describes an aggregate value with overlapping named fields (union). The fields are placed at offset 0. An ArrayLayout(element=shape_castable, length=1) object describes an aggregate value with indexed fields (array). The fields all have identical shape and are placed at offsets such that they immediately follow one another, from least significant to most significant. A FlexibleLayout(fields={\"name\": field, 0: field}, size=16) object describes a aggregate value with fields arbitrarily placed within its bounds. The representation of a discriminated union could be programmatically constructed as follows: import enum\nfrom amaranth.lib import data class Kind(enum.Enum): ONE_SIGNED = 0 TWO_UNSIGNED = 1 layout = data.StructLayout({ \"kind\": Kind, \"value\": data.UnionLayout({ \"one_signed\": signed(2), \"two_unsigned\": data.ArrayLayout(unsigned(1), 2) })\n}) Aggregate value access Aggregate values are manipulated through the amaranth.lib.data.View class. A View(layout, value_castable) object wraps a value-castable object (which may be a valid assignment target) and provides access to fields according to the layout. A view is itself value-castable, being converted to the object it's wrapping. If the view is wrapping a valid assignment target, then the accessors also return a valid assignment target. Fields can be accessed using either __getitem__ (for both named and indexed fields) or __getattr__ (for named fields). To avoid name collisions when using __getattr__ to access fields, views do not define any non-reserved attributes of their own except for the .as_value() casting method. Field names starting with _ are reserved as attribute names and and can only be accessed using the view[\"name\"] indexing syntax. When a view is used to access a field whose shape is an ordinary Shape object, the accessor returns a Value of the corresponding shape that slices the viewed object. When a view is used to access a field whose shape is an aggregate value layout, the accessor returns another View with this layout, wrapping the slice of the viewed object. For fields that have any other shape-castable object set as their shape, the behavior is the same as for the Shape case. Views that have an ArrayLayout as their layout can be indexed with a Value. In this case, the viewed object is sliced with Value.word_select. A signal can be manipulated with its structure viewed as the discriminated union defined above as follows: # creates an unsigned(3) signal by shape-casting `layout`\nsig = Signal(layout)\nview = data.View(layout, sig) # if the second argument is omitted, a signal with the right shape is created internally;\n# the line below is equivlent to the two lines above\nview = data.View(layout) m = Module()\nm.d.comb += [ view.kind.eq(Kind.TWO_UNSIGNED), view.value.two_unsigned[0].eq(1),\n] Ergonomic layout definition Rather than using the underlying StructLayout and UnionLayout classes, struct and union layouts can be defined using the Python class definition syntax, with the shapes of the members specified using the PEP 526 variable annotations: class SomeVariant(data.Struct): class Value(data.Union): one_signed: signed(2) two_unsigned: data.ArrayLayout(unsigned(1), 2) kind: Kind value: Value # this class can be used in the same way as a `data.View` without needing to specify the layout:\nview2 = SomeVariant()\nm.d.comb += [ view2.kind.eq(Kind.ONE_SIGNED), view2.value.eq(view.value)\n] When they refer to other structures or unions defined in the same way, the variable annotations are also valid PEP 484 type hints, and will be used by IDEs to derive types of properties and expressions. Otherwise, the annotations will be opaque to IDEs or type checkers, but are still useful for a human reader. The classes defined in this way are shape-castable and can be used anywhere a shape or a aggregate value layout is accepted: sig2 = Signal(SomeVariant)\nlayout2 = data.StructLayout({ \"ready\": unsigned(1), \"payload\": SomeVariant\n}) Implementation note: This can be achieved by using a custom metaclass for Struct and Union that inherits from ShapeCastable. If an explicit Layout object is nevertheless needed (e.g. for introspection), it can be extracted from the class using Layout.cast: layout == data.Layout.cast(SomeVariant) # => True Conversely, the shape-castable object defining the layout of a View (which might be a Layout subclass or a Struct/Union subclass) can be extracted from the view using Layout.of: SomeVariant is data.Layout.of(view2) # => True Advanced usage: Parametric layouts The ergonomic definitions using the Struct and Union base classes are concise and integrated with Python type annotations. However, they cannot be used if the layout of an aggregate value is parameterized. In this case, a class with similar functionality can be defined in a more explicit way: class Stream8b10b(data.View): data: Signal ctrl: Signal def __init__(self, value=None, *, width: int): super().__init__(data.StructLayout({ \"data\": unsigned(8 * width), \"ctrl\": unsigned(width) }), value) len(Stream8b10b(width=1).data) # => 8\nlen(Stream8b10b(width=4).data) # => 32 Since the parametric class name itself does not have a fixed layout, it cannot be used with Layout.cast. Similarly, the type annotations cannot include specific field widths; they are included only to indicate the presence of a corresponding attribute to IDEs and type checkers. Structure field ordering The fields of a structure layout object are ordered from least significant to most significant: float32_layout = data.StructLayout({ \"fraction\": unsigned(23), # bits 0..22 \"exponent\": unsigned(8), # bits 23..30 \"sign\": unsigned(1) # bit 31\n}) class Float32(data.Struct): fraction: unsigned(23) # bits 0..22 exponent: unsigned(8) # bits 23..30 sign: unsigned(1) # bit 31 In other words, the following identity holds: float32_storage = Signal(float32_layout)\nfloat32 = data.View(float32_layout, float32_storage) float32_storage == Cat(float32.fraction, float32_layout.exponent, float32.sign) Customizing the automatically created Signal When a view is instantiated without an explicit view target, it creates a Signal with a shape matching the view layout. The View constructor accepts all of the Signal constructor keyword arguments and passes them along; the reset= argument accepts a struct or an array (according to the type of the layout): flt_neg_reset = data.View(float32_layout, reset={\"sign\": 1}) flt_reset_less = Float32(reset_less=True) Drawbacks This feature introduces a language-level concept, shape-castable objects, increasing language complexity. This feature introduces a finely grained hierarchy of 5 similar and related classes for describing layouts. Alternatives Do nothing. Record will continue to be used alongside the continued proliferation of ad-hoc implementations of similar functionality. Remove ArrayLayout from this proposal. The array functionality is niche and introduces the complexity of handling by-index accessors alongside by-name ones. Remove ArrayLayout, UnionLayout, and FlexibleLayout from this proposal. Their functionality is less commonly used than that of StructLayout and introduces the substantial complexity of handling fields at arbitrary offsets. (This would make amaranth.lib.data useless for slicing CSRs in Amaranth SoC.) This change would bring this proposal close to the original PackedStruct proposal discussed in https://github.com/amaranth-lang/amaranth/issues/342. Combine the Layout and all of its derivative classes into a single Layout(fields={\"name\": Field(...), 0: Field(...)}) class that provides a superset of the functionality. This simplifies the API, but makes introspection of aggregate layouts very difficult and can be inefficient if large arrays are used. In this case, factory methods of the Layout class would be provided for more convenient construction of regular struct, union, and array layouts. Remove Struct and Union annotation-driven definition syntax. This makes the API simpler, less redundant, and with fewer corner cases, also avoiding the use of variable annotations that are not valid PEP 484 type hints, at the cost of a continued jarring experience for IDE users. Include a more concise and less visually noisy way to build StructLayout and UnionLayout objects (or their equivalents) using a builder pattern. This may make the syntax slightly nicer, though the RFC author could not come up with anything that would actually be such. Bikeshedding The names of the Field, *Layout, and View classes could be changed to something better. IrregularLayout was renamed to FlexibleLayout. Future work This feature could be improved in several ways that are not in scope of this RFC: StructLayout, UnionLayout, and ArrayLayout could be extended to generate layouts with padding at the end (for structs and unions) or between elements (for arrays). Currently this requires the use of a FlexibleLayout. StructLayout could be extended to accept a list of fields in addition to a map of field names to values. In this case, it would represent an aggregate value with non-overlapping indexed fields (tuple). Struct and/or StructLayout could be extended to treat certain reserved field names (e.g. \"_1\", \"_2\", ...) as designating padding bits. In this case, the offset of the following fields would be adjusted, and the fields with such names would not appear in the layout. Struct and/or StructLayout could be extended to treat certain reserved field names (e.g. \"_\" for Struct and None for StructLayout) as designating an anonymous inner aggregate. In this case, the members of the anonymous inner aggregate would be possible to access as if they were the members of the outer aggregate. The automatic wrapping of accessed aggregate fields done by View could be extended to call a user-specified cast function rather than hard-coding a check for whether the shape is a Layout. This would allow seamless inclusion of user-defined value-castable types in aggregates. The PEP 484 generics could be used to define layouts parametric over field shapes, using type annotations alone. Since Python does not have type-level integers, layouts parametric over field sizes would still need to be defined explicitly. The struct, union, and enum support could be used as the building blocks to implement first-class discriminated unions. Discriminated unions will also benefit from tuples, described above. ( Suggestion by @lachlansneff.) Acknowledgements @modwizcode , @Kaucasus , and @lachlansneff provided valuable feedback while this RFC was being drafted.","breadcrumbs":"0001-aggregate-data-structures","id":"1","title":"0001-aggregate-data-structures"},"10":{"body":"Start Date: 2023-05-15 RFC PR: amaranth-lang/rfcs#15 Amaranth Issue: amaranth-lang/amaranth#784 Lifting shape-castable objects Summary Make Signal(shape_castable, ...) return shape_castable(Signal(shape_castable.as_shape(), ...)). Motivation When Amaranth was a very new language, it did not have any facilities for ascribing type information to data. It had shapes (width and signedness), and it had special handling for range() in the shape position, as well as enumerations. Back then it made sense to have Signal, the single way to define new storage of any kind, to only operate on values (numbers / bit containers). Today the situation is completely different. Amaranth has first-class support for enumerations in the standard library as well as the standard range of data structures (structs, unions, arrays) via RFC 1 and RFC 3 . It provides extensibility through RFC 8 and RFC 9 . Using the existing hooks alone it is possible to extend Amaranth with rich numeric types (fixed-point, complex, potentially even floating-point), and some of these are very likely to end up in the standard library. All of this new functionality internally wraps a Value. It is so common and useful to initialize e.g. a struct view with a fresh Signal that data.View reexports all of the arguments of the Signal constructors and automatically constructs a Signal if no view target is provided. This works, but ties the two together more than would be ideal, and requires every similar facility to reimplement the functionality itself. What is worse is that it seems to be quite confusing to programmers, since it's not apparent that calling data.View(foo_layout) internally creates a Signal. Furthermore, people want to call Signal(foo_layout) to construct some storage for foo_layout, and that works (foo_layout is shape-castable), but does the wrong thing: the returned object is a Signal, not a data.View. It would make teaching a lot easier if we could draw an equivalence between a Signal and a variable in a general purpose programming language, and between its shape and a type in a general purpose programming language. Then, no matter what shape-castable object it is, the way to make some storage is Signal(x). It will also simplify the internals a fair bit. This change wasn't practical before RFC 8 and RFC 9 laid the groundwork for it, but now it is an obvious extension. Guide-level explanation To include state in a design, use the Signal(shape) constructor, where shape describes the bit layout and possible operations on that state. The reset= argument and the returned value depend on the shape that is provided. If it is signed(N) or unsigned(N) or a built-in enumeration or a range, then a plain Value is returned, and the reset= argument accepts a number, an enumeration member, or a constant. If it is a data.Layout, then a data.View is returned, and the reset= argument accepts a sequence or a mapping, potentially nested for nested layouts. Other shape-castable classes will have their own behavior. Warning The existing syntax for creating a View with a new Signal underlying it will be removed immediately (it has never been in a release) to resolve an ambiguity over the semantics of __call__. Reference-level explanation A method def __call__(self, value): is added on ShapeCastable. It must return Value or a ValueCastable instance with the right shape. (Such a method is opportunistically used by data.View for nested views since RFC 8 , however this RFC makes it mandatory for all shape-castable objects.) The Signal.__call__(shape, ...) method is overridden (on the metaclass) to consider shape. First, a signal is constructed normally with all of the arguments. Afterwards, if shape is a ShapeCastable instance, then shape(signal) is returned. Otherwise signal is returned. Drawbacks Increase in language complexity. More metaclasses. Signal is a final class so this is unlikely to go wrong. A Signal() constructor sometimes returning non-Signal objects can be confusing. Rationale and alternatives There are several arguments in favor of the design: It does not de facto introduce any new methods on protocols, since ShapeCastable.__call__ is expected to be implemented by essentially everyone after RFC 8 . It does not introduce new complexity to Signal.__init__; the logic for handling non-integer reset exists since RFC 9 . It eliminates unnecessary coupling between data.View (and other similar facilities) and Signal(). It is a natural extension of the language and has clear parallels to the notion of variables in other languages. It has been repeatedly requested by users, almost every time someone became familiar with the aggregate data structure design. All of these points are compelling but the last one perhaps the most. The author did not find it a stark enough necessity to introduce themselves but it does seem to be one. Alternatives: Do not do this. The status quo is acceptable. Prior art This RFC brings the semantics of Signal to be very close to semantics of typed variables in other languages. \"Lifting\" in the title of this RFC refers to a concept in functional programming of the same name where a higher order function (Signal, here) is used to generalize an operation over a set of other functions (data.View and other shape-castable objects that implement the __call__ protocol, here). Unresolved questions How does this interact with typechecking? This is a straightforward higher order function so it's probably fine. Future possibilities This RFC is the final one in a chain that started with RFC 1 . Enumerations and ranges could be adjusted such that something other than Value is returned. This creates backwards compatibility concerns though.","breadcrumbs":"0015-lifting-shape-castables","id":"10","title":"0015-lifting-shape-castables"},"11":{"body":"Start Date: 2023-08-22 RFC PR: amaranth-lang/rfcs#18 Amaranth Issue: amaranth-lang/amaranth#873 Reorganize vendor platforms Summary Update amaranth.vendor namespace so that instead of: from amaranth.vendor.lattice_ecp5 import LatticeECP5Platform you would write: from amaranth.vendor import LatticeECP5Platform Motivation Vendor names are ever-changing. Xilinx was bought by AMD and the brand has been phased out. Altera was bought by Intel and the brand has been phased out. SiliconBlue has been bought by Lattice (a long time ago) and the brand has long been phased out but still remains as \"SB\" in SB_LUT primitive name. In addition, we attempt to group FPGA families into a single file, like vendor.lattice_machxo2_3l that has been renamed from vendor.lattice_machxo2. This will likely include another FPGA family as soon as it becomes available. By tying module (and file) names to brand names we create churn. Every Amaranth release so far has included renaming of both platform class names and module names. This causes additional downstream breakage and annoys designers using Amaranth. Guide-level explanation To target your FPGA-based project for a particular FPGA family, import the platform class corresponding to the FPGA family from amaranth.vendor, e.g.: from amaranth.vendor import LatticeECP5Platform Reference-level explanation All of the amaranth.vendor.name modules are renamed to amaranth.vendor._internal_name. Python allows __getattr__ to be present in modules: $ cat >x.py\ndef __getattr__(self, name): return f\"__getattr__({name!r})\"\n$ python\n>>> from x import abc\n>>> abc\n\"__getattr__('abc')\" This allows us to make all the platform classes be present as-if they were defined in the amaranth.vendor modules, while retaining all of the benefits of having them in their own amaranth.vendor._internal_name module, such as lazy loading. Drawbacks Churn. A somewhat unusual loading mechanism could cause confusion. Rationale and alternatives Decoupling marketing/brand names from technical names is increasingly important as Amaranth evolves and supports more FPGA families. It allows us to maintain any internal hierarchy we want without it having any impact on downstream code, which solely operates on names imported from amaranth.vendor. Prior art None. Unresolved questions None. Future possibilities None.","breadcrumbs":"0018-reorganize-vendor-platforms","id":"11","title":"0018-reorganize-vendor-platforms"},"12":{"body":"Start Date: 2023-08-22 RFC PR: amaranth-lang/rfcs#19 Amaranth Issue: amaranth-lang/amaranth#874 Remove amaranth.lib.scheduler Summary Remove amaranth.lib.scheduler and the only class RoundRobin in it. Motivation This module is not used in the sole place for which it was added (Amaranth SoC), it is not especially useful, and it has not undergone proper community review when it was added. Guide-level explanation The module amaranth.lib.scheduler and the sole class RoundRobin in it is removed. To continue using it, copy the contents of the module into your own project. Reference-level explanation The class amaranth.lib.scheduler.RoundRobin is deprecated in Amaranth 0.4 and removed in Amaranth 0.5. Drawbacks Churn. Rationale and alternatives This module is out of place in the standard library. It has not seen much use and is trivially implemented outside of it. Downstream consumers tend to inline the logic anyway. It does not seem like there would be any other uses for the amaranth.lib.scheduler module since any other scheduling algorithm would be more closely tied to the consumer. Unresolved questions None. Future possibilities None.","breadcrumbs":"0019-remove-scheduler","id":"12","title":"0019-remove-scheduler"},"13":{"body":"Start Date: 2023-08-22 RFC PR: amaranth-lang/rfcs#20 Amaranth Issue: amaranth-lang/amaranth#875 Deprecate non-FWFT FIFOs Summary Deprecate non-first-word-fall-through FIFOs. Motivation Currently, FIFOs in amaranth.lib.fifo have two incompatible interfaces: FWFT (first word fallthrough) and non-FWFT. The incompatibility concerns only the read half. FWFT FIFOs have r_data valid when r_rdy is asserted. Non-FWFT FIFOs have r_data valid only after strobing r_en, if the FIFO was empty previously. Non-FWFT interface is awkward and is essentially never used. It is a holdover from Migen and its implementation details that was included for compatibility. There are three downsides to having it: Having non-FWFT FIFOs requires every consumer of the FIFO interface to check for fwft when interacting with the FIFO and either asserting that it is True, or adding a code path to handle it. No one does this. The FWFT interface is directly compatible with streams and allows us to add e.g. r_stream and w_stream to existing FIFOs without adding a wrapper such as stream.FIFO. It also makes any custom FIFOs defined downstream of Amaranth stream-enabled. The notion of FWFT vs non-FWFT FIFOs is confusing and difficult to understand. E.g. the author of this RFC wrote both lib.fifo and the Glasgow FIFO code, and she misused the fwft argument in the latter. Guide-level and reference-level explanation In the next version, instantiating SyncFIFO(fwft=False) emits a deprecation warning. In addition, FIFOInterface's fwft parameter now defaults to True. Other FIFOs have no non-FWFT variant in the first place. In the version after that, there is no way to instantiate SyncFIFO(fwft=False). The feature and all references to it are removed in their entirety. Implementation considerations At the moment, SyncFIFOBuffered is implemented as a register in the output of SyncFIFO(fwft=False). The implementation will need to be rewritten. Drawbacks Churn. There will be no alternative to SyncFIFO(fwft=False). Rationale and alternatives It is feasible to extract SyncFIFO(fwft=False) into its own module that may be used by downstream code that needs non-FWFT FIFOs. It would not implement FIFOInterface. There is no reason the SyncFIFO class could not be copied into downstream code as it is. It is possible to wrap FIFOs in the stream library in a way that ensures only FWFT FIFOs are used. Let's not create pointless wrappers. Prior art Not relevant. Unresolved questions None. Future possibilities This RFC primarily exists to enable better stream interface integration.","breadcrumbs":"0020-deprecate-non-fwft-fifos","id":"13","title":"0020-deprecate-non-fwft-fifos"},"14":{"body":"Start Date: 2023-08-22 RFC PR: amaranth-lang/rfcs#21 Patch releases Summary Change Amaranth versioning from major.minor to major.minor.patch after version 0.4, and define the backport policy for patch releases. Motivation Amaranth 0.3 was released on 2021-12-16; almost two years ago. Several important bugs have been fixed in main since, most notably depending on a version of Jinja2 that is no longer installable. At the moment the policy is to issue only major.minor releases, which was OK in the early days but no longer fits the project. We should change the policy that is used for the next Amaranth release and later ones. Explanation Amaranth feature releases all have the version of major.minor.0. The policy for these releases is unchanged and is tied to our two-step process for making breaking changes. In addition to these releases, Amaranth now has bug-fix releases with the major.minor.patch versions. These are intended to address the need of the community to have bugs fixed before a next feature release can be made, and the policy is designed to minimize developer time spent on them. Bug-fix releases are made when all of the following conditions are satisfied: There is an issue that is fixed in the main branch. A member of the community requests this issue to be fixed in a point release. It is possible to fix the issue such that there is a high degree of confidence that the change will not break existing code using Amaranth with a ~=major.minor version constraint. A community member steps up to backport the fix to the release branch. This could be one of the Amaranth maintainers, or anyone else. Amaranth maintainers have no obligation to back-port any fix. Drawbacks This creates additional work for maintainers. Rationale and alternatives It would be possible to backport all feasible fixes as a policy. This would significantly increase maintainer workload. It is possible to keep the current policy. Because we do not control all of the upstream dependencies (including Python), this seems untenable. Prior art Rust has an even stricter bug-fix release policy: the Rust project only issues patch releases in cases of security issues, widespread miscompilations, or unintentional breaking changes. Unresolved questions Should Amaranth SoC adopt the same policy? Future possibilities Eventually, Amaranth may gain release engineers who will maintain long-living release branches.","breadcrumbs":"0021-patch-releases","id":"14","title":"0021-patch-releases"},"15":{"body":"Start Date: 2023-08-22 RFC PR: amaranth-lang/rfcs#22 Amaranth Issue: amaranth-lang/amaranth#876 Define ValueCastable.shape() Summary Require value-castable objects to have a method that returns their high-level shape. Motivation RFC #15 advanced the extensibility of the language significantly, but broke constructs like Signal.like(Signal(data.StructLayout(...))). In addition, not having a well-defined point for returning the high-level shape (i.e. a shape-castable object from which this value-castable object was creaed rather than a Shape instance) causes workarounds such as data.Layout.of to be added to the language and standard library. Explanation The ValueCastable interface has a method .shape(). This method returns a shape-castable object. Where possibe, this object should, when passed to Signal, create a value-castable object of the same type. amaranth.lib.data.Layout.of is removed immediately. Drawbacks Increased API surface area At one point a commitment was made that the only method ValueCastable will ever define will be as_value. However, radical changes to the language such as RFC #15 make it reasonable to revisit this. Rationale and alternatives This change is the minimal possible one that fixes the problem systemically. Some minor variations in the design are possible: Instead of requiring shape() to be defined (which is a breaking change), this method can be added optionally in the next release and be required in the release after that. This is difficult to do with ValueCastable and will require workarounds both in the core language implementation and in downstream code that operates on ValueCastable objects. ValueCastable is not very widely used yet and the breakage will likely be minimal. Prior art It is typical for a programming language to have a way of retrieving the type of a value. The mechanism being added here is equivalent. Unresolved questions None. Future possibilities None.","breadcrumbs":"0022-valuecastable-shape","id":"15","title":"0022-valuecastable-shape"},"16":{"body":"Start Date: 2023-10-30 RFC PR: amaranth-lang/rfcs#0028 Amaranth Issue: amaranth-lang/amaranth#0929 Allow overriding Value operators Summary Allow overriding binary Value operators with reflected operators in a value-castable type. Motivation A value-castable type can define operators that return another value-castable. However, if the left side operand is a Value, its operator will be called first, casting the right side operand to a plain Value. This creates a mismatch in behavior depending on the type and order of operands. As an example, consider the multiplication of a fixed point value-castable with an integral type: >>> Q(7).const(0.5) * 255\n(fixedpoint Q8.7 (* (const 8'sd64) (const 8'd255)))\n>>> 255 * Q(7).const(0.5)\n(fixedpoint Q8.7 (* (const 8'sd64) (const 8'd255)))\n>>> Q(7).const(0.5) * C(255)\n(fixedpoint Q8.7 (* (const 8'sd64) (const 8'd255)))\n>>> C(255) * Q(7).const(0.5)\n(* (const 8'd255) (const 8'sd64)) Explanation When a binary Value operator is called with a value-castable other, check whether the value-castable implements the reflected variant of the operator first and defer to it when present. Drawbacks Extra logic required around every Value operator. Prior art This is standard behavior for inheritance in Python : Note: If the right operand’s type is a subclass of the left operand’s type and that subclass provides a different implementation of the reflected method for the operation, this method will be called before the left operand’s non-reflected method. This behavior allows subclasses to override their ancestors’ operations. We don't get this behavior automatically because Value is not an ancestor of ValueCastable, but it would make sense for it to behave as it were. Rationale and alternatives As an alternative, Value and ValueCastable could be rearchitected so that ValueCastable inherits from either Value or a common base that implements the Value operators. This would make Python do the right thing w.r.t. operator overriding, but is a larger change with more potential for undesirable consequences. Unresolved questions None. Future possibilities Value.eq() could in the same manner check for and defer to a .req() method, i.e. reflected .eq(), to allow a value-castable to override how assignment from it to a Value is handled.","breadcrumbs":"0028-override-value-operators","id":"16","title":"0028-override-value-operators"},"17":{"body":"Start Date: 2023-11-27 RFC PR: amaranth-lang/rfcs#31 Amaranth Issue: amaranth-lang/amaranth#972 Enumeration type safety Summary Make Amaranth Enum and Flag use a custom ValueCastable view class, enforcing type safety. Motivation Python Enum provides an opaque wrapper over the underlying enum values, providing type safety and guarding against improper usage in arithmetic operations: >>> from enum import Enum\n>>> class EnumA(Enum):\n... A = 0\n... B = 1\n...\n>>> EnumA.A + 1\nTraceback (most recent call last): File \"\", line 1, in \nTypeError: unsupported operand type(s) for +: 'EnumA' and 'int' Likewise, Flag values can be used in bitwise operations, but only within their own type: >>> from enum import Flag\n>>> class FlagA(Flag):\n... A = 1\n... B = 2\n... >>> class FlagB(Flag):\n... C = 1\n... D = 2\n... >>> FlagA.A | FlagA.B\n\n>>> FlagA.A | FlagB.C\nTraceback (most recent call last): File \"\", line 1, in \nTypeError: unsupported operand type(s) for |: 'FlagA' and 'FlagB' However, these safety properties are not currently enforced by Amaranth on enum-typed signals: >>> from amaranth import *\n>>> from amaranth.lib.enum import *\n>>> class FlagA(Flag):\n... A = 1\n... B = 2\n... >>> class FlagB(Flag):\n... C = 1\n... D = 2\n... >>> a = Signal(FlagA)\n>>> b = Signal(FlagB)\n>>> a | b\n(| (sig a) (sig b)) Guide-level explanation Like in Python, Enum and Flag subclasses are considered strongly-typed, while IntEnum and IntFlag are weakly-typed. Enum-typed Amaranth values with strong typing are manipulated through amaranth.lib.enum.EnumView and amaranth.lib.enum.FlagView classes, which wrap an underlying Value in a type-safe container that only allows a small subset of operations. For weakly-typed enums, Value is used directly, providing full interchangeability with other values. An EnumView or a FlagView can be obtained by: Creating an enum-typed signal (a = Signal(MyEnum)) Explicitly casting a value to the enum type (MyEnum(value)) The operations available on EnumView and FlagView include: Comparing for equality to another view of the same enum type (a == b and a != b) Assigning to or from a value Converting to a plain value via Value.cast The operations additionally available on FlagView include: Binary bitwise operations with another FlagView of the same type (a | b, a & b, a ^ b) Bitwise inversion (~a) A custom subclass of EnumView or FlagView can be used for a given enum type if so desired, by using the view_class keyword parameter on enum creation. Reference-level explanation amaranth.lib.enum.EnumView is a ValueCastable subclass. The following operations are defined on it: EnumView(enum, value_castable): creates the view shape(): returns the underlying enum as_value(): returns the underlying value eq(value_castable): delegates to eq on the underlying value __eq__ and __ne__: if the other argument is an EnumView of the same enum type or a value of the enum type, delegates to the corresponding Value operator; otherwise, raises a TypeError All binary arithmetic, bitwise, and remaining comparison operators: raise a TypeError (to override the implementation provided by Value in case of an operation between EnumView and Value) amaranth.lib.enum.FlagView is a subclass of EnumView. The following additional operations are defined on it: __and__, __or__, __xor__: if the other argument is a FlagView of the same enum type or a value of the enum type, delegates to the corresponding Value operator and wraps the result in FlagView; otherwise, raises a TypeError __invert__: inverts all bits in this value corresponding to actually defined flags in the underlying enum type, then wraps the result in FlagView The behavior of EnumMeta.__call__ when called on a value-castable is changed as follows: If the enum has been created with a view_class, the value-castable is wrapped in the given class Otherwise, if the enum type is a subclass of IntEnum or IntFlag, the value-castable is returned as a plain Value Otherwise, if the enum type is a subclass of Flag, the value-castable is wrapped in FlagView Otherwise, the value-castable is wrapped in EnumView The behavior of EnumMeta.const is modified to go through the same logic. Drawbacks This proposal increases language complexity, and is not consistent with eg. how amaranth.lib.data.View operates (which has much more lax type checking). Rationale and alternatives Do nothing. Operations on mismatched types will continue to be silently allowed. Equality could work more like Python equality (always returning false for mismatched types). Assignment could be made strongly-typed as well (with corresponding hook added to Value). Prior art This feature directly parallels the differences between Python's Enum/Flag and IntEnum/IntFlag. Unresolved questions Instead of having an extension point via view_class, we could instead automatically forward all otherwise unknown methods to the underlying enum class, providing it the EnumView as self. Future possibilities None.","breadcrumbs":"0031-enumeration-type-safety","id":"17","title":"0031-enumeration-type-safety"},"18":{"body":"Start Date: 2023-12-04 RFC PR: amaranth-lang/rfcs#34 Amaranth Issue: amaranth-lang/amaranth#985 Rename amaranth.lib.wiring.Interface to PureInterface Summary The Interface class in amaranth.lib.wiring is renamed to PureInterface, to avoid the impression that it is used for all interfaces. Motivation The current naming of the Interface class wrongly suggests that it is the base class to be used for all interfaces, and that isinstance(foo, Interface) is a valid check for an interface. However, this is in stark contrast to how lib.wiring works: any object can be an interface, as long as it has a signature property and compliant members. This misleads users (and, on at least two occasions, amaranth developers), making them write buggy code. Additionally, the naming makes spoken language ambiguous in a bad way, as it is impossible to tell apart \"an interface\" and \"an Interface\". Therefore, this RFC proposes to rename Interface to something more specific and reflecting its function. Guide-level explanation The Interface class in amaranth.lib.wiring is renamed to PureInterface. Reference-level explanation The Interface class in amaranth.lib.wiring is renamed to PureInterface. Drawbacks Minor churn. Rationale and alternatives The new name is, of course, subject to bikeshedding. The names that have been proposed are: PureInterface BareInterface Prior art None. Unresolved questions None. Future possibilities The name Interface that has just been freed up can be reused for an ABC-like class representing all valid interfaces.","breadcrumbs":"0034-interface-rename","id":"18","title":"0034-interface-rename"},"2":{"body":"Start Date: 2023-08-22 RFC PR: amaranth-lang/rfcs#2 Amaranth Issue: amaranth-lang/amaranth#872 Interface definition library RFC Summary Add standard ways of declaring that a component of a design conforms to a particular interface and connecting components with complementary interfaces together, to fill the other of the two major use cases of Record while avoiding its downsides. See also RFC #1 . Motivation Digital designs are composed of densely packed components that communicate with each other using well-defined interfaces. Mechanisms to denote the boundary of a component, to ensure that a component complies to a specified interface, and to make reliable connections between components are essential. Currently, Amaranth provides none of these mechanisms. A component implemented in Amaranth, however well-defined conceptually, has no more external structure than a loose collection of Signals assigned to its attributes; and whether any one of them is a part of the interface or the implementation is up to a guess. Even when an interface is described using amaranth.hdl.rec.Layout, such a description cannot be used to verify even the simplest aspects of compliance, such as presence of fields. Although building components by composing smaller components together is ubiquitous, amaranth.hdl.rec.Layout is not able to compose their interface with the same ease. Connecting components using amaranth.hdl.rec.Record.connect is difficult enough that it sees very little use. Originally, Record was aimed at solving many of these issues. However, it has multiple major drawbacks: Record attempts to do too much: it is both a mechanism for controlling representation (including implicitly casting a record to a value) and a mechanism for defining interfaces (specifying signal directions and facilitating connections between records). These mechanisms should be defined separately, since the only aspect they have in common is using a container class that consists of multiple named fields. Conflating the two mechanisms constraints the design space, making addressing the other drawbacks impossible, and the ill-defined scope encourages bugs in downstream code. Record's model of signal directions is too complex. Because it attempts to model both aggregates with controlled representation and interfaces with defined directionality, every signal can have one of the three directions, the third option being non-directed. While this can be applied in a robust way-- FIRRTL has only one aggregate type that it uses for both purposes--this gives rise to a large combination of features and requires handling many edge cases. Record's model of signal directions is too limited. The two static directionalities it has are the confusingly named \"fanout\" and \"fanin\", which really mean \"from initiator to target\" and \"from target to initiator\". This is insufficient to describe common, straightforward interactions such as two components exchanging streams of data across pairs of identical, complementary endpoints. Records are hard to customize. Records create and hold their signals, only providing the caller with an ability to place caller-created signals into individual fields. Signals often need adjustments: primarily setting a reset value or adding a decoder, but sometimes adding attributes or renaming. These adjustments must be performed at the record creation site, which is burdensome. Record fields can be (apart from sub-records) only plain signals. In many cases, an interface between components carries structured data rather than opaque bit vectors. It is not possible to define inner structure for record fields other than through a sub-record, and using a sub-record for this means that an application-specific endpoint that defines such structure cannot be connected to a generic endpoint that does not. Records are hard to compose. The natural way to define a record is to call the Record constructor with a layout, but this creates the entire layout hierarchy unless parts of it are replaced; and it requires having the layout of the result in advance. Record.connect determines the direction of data flow that it will create by the relative position of the interfaces being connected, with x.connect(y) and y.connect(x) having the oposite polarity of assignments. However, the direction of data flow is defined by the component that exposes the interface. Thus, every call of Record.connect can be done in one of the two very similar ways, one of which is always wrong. Record.connect uses wired-OR to gather the \"fanin\" signals, a feature that exists so that it could be used to connect e.g. Wishbone endpoints together without additional gateware. The assumption that the response signals of inactive endpoints will remain all-zero is, generally, unsound. Record.connect manages connections between interfaces with optional signals at the call site using an include/exclude mechanism. However, the semantics of the non-implemented optional signals are a property of the interface, not the connection. Record and rec.Layout are often used as base classes. The Record.like facility, frequently used because of the poor ergonomics of rec.Layout, loses this information and returns an instance of the base class; rec.Layout does the same when indexed. As a result, there is little value in defining methods and attributes on the subclass, and Record subclasses are little more than a callable computing a layout. Due to the limitations of Record, one might define a plain Python class that exposes compatible attributes. An instance of such a class cannot be compared to a known rec.Layout nor can it be embedded in another Record. Record is value-castable and implements the .eq() protocol. Although useful when all fields are non-directional, using .eq() instead of .connect() when connecting directional interfaces is, generally, unsound. It also reserves commonly used names such as any, all, and matches, and implements arithmetic operations that are rarely if ever used on field containers. rec.Layout's DSL is very amorphous. It passes around variable length tuples. The second element of these tuples (the shape) can be another rec.Layout, which is neither a shape nor a shape-castable object. Since these drawbacks are entrenched in the public API and make Record nearly useless for defining interfaces, a new mechanism must replace it. Outline of the design space Although some HDLs and IRs (Migen, Chisel, FIRRTL, ...) choose to use the same basic aggregate data type to represent structured data and directional interfaces , these mechanisms are in direct conflict. Complex forms of structured data, such as unions, are incompatible with associating directionality independently with every leaf member; and the non-directional nature of stored data requires complicated and error-prone rules when it can become a part of a directional connection. Amaranth, instead, opts to include two superficially similar mechanisms for defining and accessing hierarchical aggregate data: amaranth.lib.data (RFC #1) and amaranth.lib.wiring (this RFC). amaranth.lib.data provides data views that reinterpret bit containers as complex aggregates, and entirely avoids directionality. amaranth.lib.wiring provides signatures that give a concrete shape to signals at component boundaries, and always treats them as directional. When connections are made strictly between an output and a correspondingly named input, interfaces gain a dualistic nature: every connection is made between two interfaces whose port directions are the inverse of each other, and which are identical otherwise. To describe interfaces without repeating oneself, then, one has to pick an arbitrarily preferred directionality (and stick with it). Many interfaces are asymmetric, with data flowing from a source to a sink, or transactions issued from an initiator to a target. Amaranth picks the source or initiator perspective; an interface, examined in isolation, defines as outputs the signals that would be outputs of an initiator (and inputs of a target). Then, when an interface with true (non-flipped) directionality describes a component's output, the same interface with inverse (flipped) directionality symmetrically describes an input. To eliminate the major usability issues with Record.connect, the interface connection mechanism assigns no precedence to interfaces and has no effect on signal directionality; whether a signal is an input or an output depends only on the interface itself. A connection is only made from an output to a matching input, and any other combination is rejected with a diagnostic. This way, connecting a pair of interfaces always leads to the same outcome, regardless of their order. The choice to always treat interface signals as directional and to make their directionality dependent only on the interface itself leaves only one aspect of the design open: when and how interface directionality is flipped. The decisions that determine it affect both ergonomics and soundness. Record.connect in effect gives the programmer an option to flip directionality even when it would create an illegal connection. Conversely, rec.Layout provides no such affordance, even though it is necessary for composing components. To facilitate composing components, the interface's directionality is flipped when it is used as an input, whether a top-level input of a component, or as a constituent of a larger interface. This way, the existing mechanism of annotating the directionality of an interface signal or a module port transparently handles interface composition. Guide-level explanation Amaranth designs are made out of components (Python classes implementing Elaboratable) whose attributes include signals. These signals have directions: \"in\" signals are sampled by the component, while \"out\" signals are driven by it, or left at their reset value, and are provided to be sampled by other components. At the moment, these directions are completely informal, and described in the documentation and/or in the signal name as an i_ or o_ prefix (to make it clearer what the direction is at the point of use, or to disambiguate the ports that would otherwise have identical name): class SequenceSource(Elaboratable): \"\"\" Ports ----- data : Signal(width), out ready : Signal(1), in valid : Signal(1), out \"\"\" def __init__(self, width=16): self.data = Signal(width) self.ready = Signal() self.valid = Signal(reset=1) def elaborate(self, platform): m = Module() with m.If(self.ready): m.d.sync += self.data.eq(self.data + 1) return m The SequenceSource component is implemented as a simple counter producing values for an output stream that is connected to some other component consuming them. On each clock tick, if the consumer is ready , it samples the data (the counter value), and simultaneously with that, the producer advances the data to the next item (the incremented value). Since there is always a next item available and it is ready for consumption on the next clock cycle, the stream always contains valid results. Note It is not, in general, possible to infer the directions of the signals from the implementation—here, ready and valid have different directions and different intended uses, but they look similar to the Amaranth implementation since they are both undriven in the component. This RFC proposes a way of describing signal directions that can be applied to any Python object. In addition to elaboratables, it includes Python objects that are used to group together signals with a similar purpose, such as those that are parts of a bus. To describe signal directions, only a single addition is needed: the signature property: from amaranth.lib.wiring import Signature, In, Out class SequenceSource(Elaboratable): ... signature = Signature({ \"data\": Out(16), \"ready\": In(1), \"valid\": Out(1) }) Consider another component that is consuming these values: class NumberSink(Elaboratable): ... def elaborate(self): m = Module() processing = Signal() m.d.comb += self.ready.eq(~processing) with m.If(self.valid & ~processing): m.d.sync += processing.eq(1) with m.Elif(processing): ... # process it somehow signature = Signature({ \"data\": In(16), \"ready\": Out(1), \"valid\": In(1) }) Currently, the only way (given the tools provided by the language and the standard library) to connect the output stream of the SequenceSource to the input stream of the NumberSink is to do this signal-wise: m = Module()\nm.submodules.source = source = SequenceSource()\nm.submodules.sink = sink = NumberSink()\nm.d.comb += [ sink.data.eq(source.data), source.ready.eq(sink.ready), sink.valid.eq(source.valid)\n] This is tedious, verbose, and error-prone. It is possible to define an application-specific function abstracting this operation, and many applications do, but something this universal should be defined on the language level. This RFC introduces a way to describe interfaces (collections of directional signals; more on this later) and a single operation: connecting . The code above now transforms into: from amaranth.lib.wiring import connect m = Module()\nm.submodules.source = source = SequenceSource()\nm.submodules.sink = sink = NumberSink()\nconnect(m, sink, source) The order of arguments to connect does not matter as the directionality is defined by the components themselves. It could just as well be written as: connect(m, source, sink) However, this approach still has flaws. Most importantly, the signature for SequenceSource and NumberSink is written twice, but their signature is exactly the same except that the direction is flipped: In members become Out, and vice versa. To avoid error-prone repetition here, the signature can be defined once: Stream16BitSignature = Signature({ \"data\": Out(16), \"ready\": In(1), \"valid\": Out(1)\n}) and then used twice, for both the source and the sink: class SequenceSource(Elaboratable): ... signature = Stream16BitSignature class NumberSink(Elaboratable): ... signature = Stream16BitSignature.flip() The Signature.flip() method returns a flipped signature object : a signature object whose members have inverse direction but which is otherwise identical. Since this approach has reusable signatures defined with a specific direction, it is necessary to make an arbitrary choice: pick the kind of object whose signature will use the non-flipped directions. This RFC picks the object that is the source of data (for stream-like interfaces), the transaction initiator (for bus-like interfaces), and so on to use non-flipped directions by convention. Although some duplication was eliminated, some more remains: currently, it is necessary to define a stream signature for every kind of stream (a stream of 16-bit values, a stream of RGB colors, and so on). It is possible to define a reusable stream signature by inheriting from the Signature class: class StreamSignature(Signature): def __init__(self, payload_shape): super().__init__({ \"payload\": Out(payload_shape), \"ready\": In(1), \"valid\": Out(1) }) The elaboratables above can then be defined as: class SequenceSource(Elaboratable): ... signature = StreamSignature(16) class NumberSink(Elaboratable): ... signature = StreamSignature(16).flip() Usually, elaboratables have more than one interface. For example, a very simple DSP block could sink a stream of signed numbers, take their absolute value, and source a stream of unsigned numbers. It would then have a pair of ready, valid, and payload signals each: one for the input steam, and another for the output stream. To handle this case, signature's members can be signatures themselves. These members also have directionality; an Out signature leaves the directionality of its members unchanged, while an In signature flips it. The signature method of the processing block could be defined as: class AbsoluteProcessor(Elaboratable): ... signature = Signature({ \"i\": In(StreamSignature(signed(16))), \"o\": Out(StreamSignature(unsigned(16))) }) To be compliant with this signature, an AbsoluteProcessor instance must have an i attribute compliant with a StreamSignature(signed(16)).flip(), and an o attribute compliant with a StreamSignature(unsigned(16)). These could be defined manually: class AbsoluteProcessor(Elaboratable): def __init__(self): self.i = object() self.i.payload = Signal(signed(16)) self.i.ready = Signal() self.i.valid = Signal() self.i.signature = StreamSignature(signed(16)).flip() self.o = object() self.o.payload = Signal(unsigned(16)) self.o.ready = Signal() self.o.valid = Signal() self.o.signature = StreamSignature(unsigned(16)) ... Once more, to reduce error-prone repetition, the Signature class offers a way to define objects just like the ones created above, making the complete definition be: class AbsoluteProcessor(Elaboratable): def __init__(self): self.i = StreamSignature(signed(16)).flip().create() self.o = StreamSignature(unsigned(16)).create() signature = Signature({ \"i\": In(StreamSignature(signed(16))), \"o\": Out(StreamSignature(unsigned(16))) }) ... Signature subclasses can also override the create method to add functionality not present in the base class. For example, a signature for a bus such as Wishbone or AXI could return an instance of a class rather than a simple object(), and include attributes indicating which optional features of the bus are enabled. However, since the interface of AbsoluteProcessor as a whole can itself be described as a signature, it is possible to further shorten it by deriving from component.Component instead of Elaboratable, in which case the attributes will be filled in from the signature automatically: from amaranth.lib.wiring import Component class AbsoluteProcessor(Component): signature = Signature({ \"i\": In(StreamSignature(signed(16))), \"o\": Out(StreamSignature(unsigned(16))) }) def elaborate(self): m = Module() with m.If(self.i.payload > 0): m.d.comb += self.o.payload.eq(self.i.payload) with m.Else(): # Does not overflow, since -(-32768) [least signed(16)] is less # than 65536 [greatest unsigned(16)]. m.d.comb += self.o.payload.eq(-self.i.payload) return m Python variable annotations can also be used in cases like the above, where the signature is the same for every instance of the class (i.e. the component is not parameterized during creation): class AbsoluteProcessor(Component): i: In(StreamSignature(signed(16))) o: Out(StreamSignature(unsigned(16))) def elaborate(self): m = Module() with m.If(self.i.payload > 0): m.d.comb += self.o.payload.eq(self.i.payload) with m.Else(): # Does not overflow, since -(-32768) [least signed(16)] is less # than 65536 [greatest unsigned(16)]. m.d.comb += self.o.payload.eq(-self.i.payload) return m All of the import statements in the code examples above can be replaced with: from amaranth.lib.wiring import * Reference-level explanation This RFC proposes a number of library additions: Adding classes that describe a hierarchy of Amaranth objects (an elaboratable object and the objects containing its interface signals) and ease instantiating such hierarchies. Adding a function that connects such hierarchies to each other. It also introduces a number of technical terms: A component is an Amaranth elaboratable object. An interface (a concept) is a shared boundary across which several Amaranth components exchange data. It is comprised of a set of signals and the invairants that govern their use. An interface object (an implementation of the concept) a Python object that includes: attributes whose value is an Amaranth value-castable, or another interface; a signature attribute whose value is a signature that is compliant with this object; a description of the invariants applying to its use (in form of documentation, testbenches, formal tests, etc.). A signature is a Signature instance describing requirements applicable to a hierarchy of interace objects. A signature member is a Member instance describing requirements applicable to a single attribute of an interface object. Two kinds of signature members exist: port members (requiring the value of the attribute to be a Signal), and interface members (requiring the value of the attribute to be another interface object). An object is compliant with a signature (therefore making it an interface object) if every member of the signature corresponds to an attribute of the object whose value fits the requirements. A single elaboratable object will often have several interfaces; e.g. a peripheral can have a CSR and/or Wishbone bus interface, and a pin interface. However, the elaboratable object itself can be an interface object as well, which makes it easy to convert it to Verilog and use standalone since its signature defines the ports the Verilog module needs to have. Interface description Interfaces are described using an enumeration, amaranth.lib.wiring.Flow, and two classes, amaranth.lib.wiring.Member and amaranth.lib.wiring.Signature: Flow is an enumeration with two values, In and Out. Flow.__call__(arg, **kwargs) forwards to Member(self, arg, **kwargs). Thus, Out(unsigned(16), reset=0x1234) is a shorthand for Member(Flow.Out, unsigned(16), reset=0x1234). flow.flip() flips the value from In to Out and back. A Member(flow, ...) object describes a part of an interface. It is immutable. A Member(flow, shape_castable, reset=reset_value) object describes a port with the given shape and flow direction. The returned Member object has: the .flow property be flow; the .is_port property be True; the .is_signature property be False; the .shape property be shape_castable; the .reset property be reset_value; the .signature property raise TypeError; the .dimensions property be (). A Member(flow, signature) object describes a constituent interface with the given flow direction. If flow is Flow.In, then the actual flow of every port recursively described by signature is the reverse of the stated direction. The returned Member object has: the .flow property be flow; the .is_port property be False; the .is_signature property be True; the .shape property raise TypeError; the .reset property raise TypeError; the .signature property return signature if flow is Out, signature.flip() if flow is In. the .dimensions property be (). member.array(*dimensions) returns a new Member object whose .dimensions property is dimensions, which is any amount of non-negative numbers, and all other properties are the same as those of member. Calling .array() on a member with dimensions prepends the new dimensions before the old ones, for composability. member.flip() returns a new Member object whose .flow property is ~member.flow, and all other properties are the same as those of member. A Signature(...) object describes an interface comprised of named members: ports and nested interfaces (which themselves are described using signature objects). The Signature class can be derived from. Instances of Signature itself are termed anonymous signatures , and instances of derived classes are named signatures . A Signature({\"name\": Member(...)}) object can be constructed from a name to member mapping. signature.members is a mutable mapping that can be used to alter the description of a non-frozen signature. signature.members += {...} adds members from the given mapping to signature.members if the names being added are not already used. Raises NameError otherwise. signature.freeze() (or signature.members.freeze()) prevents any further modifications of signature (and in particular signature.members), enabling the caller to rely on a particular layout. It is applied recursively to constituent interfaces. It returns self to aid assignments in class definition like: class X: signature = Signature({ ... }).freeze() signature.flip() returns a signature where every member is member.flip()ped. The exact object returned is a proxy object that overrides the methods and attributes defined here such that the flow is flipped, and otherwise forwards attribute accesses untouched. That is, signature.x = and signature.flip().x = both define an attribute on the original signature object, and never on the proxy object alone. When calling method signature.f as signature.flip().f, self is the flipped signature. signature.flatten(object) returns an iterator yielding a path, member, value tuples for each of the ports recursively contained in the signature, where: path is a tuple of strings or integers indicating the sequence of attribute or index accesses that were used to retrieve value from object member is the port member corresponding to value, with the flow flipped as appropriate value is a value-castable object corresponding to the port (usually but not always a Signal) signature.is_compliant(object) checks whether an arbitrary Python object is compliant with this signature. To be compliant with a signature: for every member of the signature, the object must have a corresponding attribute if the member is a port, the attribute value must be a value-castable such that Value.cast(object.attr) method returns a Signal or a Const that has the same width and signedness, and for signals, is not reset-less and has the same reset value as the member a warning may be emitted if the .shape of the member and the .shape() of object.attr are not equal if the member is an interface, the attribute value must be compliant with the signature of the member if the member's dimensions are (p, q, ...), the requirements below hold instead for every result of indexing the attribute value with [i][j]... where i in range(p), j in range(q), ... signature.members.create() creates a dictionary of members from it. This is a helper method for the common part of signature.create(). For every member of the signature, the dictionary contains a value equal to: If the member is a port, Signal(member.shape, reset=member.reset). If the member is a signature, member.signature.create() for Out members, and member.signature.flip().create() for In members. signature.create() creates an interface object from this signature. To do this, it calls the constructor of Interface described below. This method is expected to be routinely overridden in Signature subclasses to instantiate subclasses of Interface. All of the methods that can be called on signature can be called on the object returned by signature.flip(), and self in that case is signature.flip(). This means that in a method defined on a subclass of Signature, self can be an instance of that type, or an instance of a different type, FlippedSignature, which implements the flipping behavior. In the rare case where it is useful to determine which one it is, it is possible to use type(self) is amaranth.lib.wiring.FlippedSignature. Any object can be an interface object if it has the appropriate signature property. However, an amaranth.lib.wiring.Interface class is introduced, serving two purposes: instantiating interfaces from an anonymous signature, and serving as a convenient base class for custom interface classes. The Interface class implements only the __init__() method, accepting a signature as a parameter. It assigns self.signature to be that signature, and for each item in signature.members.create() it creates a corresponding attribute on self. Interface connection Interface objects may be connected to each other using the amaranth.lib.wiring.connect(m, *objects) free function. This function connects interface objects that satisfy the following requirements: The set of members (considered by their paths) is exactly the same for each of the objects. For each given path, all members are either signature members or port members. For each given path where all members are port members, the width of every member with the same path is equal, though the exact types of the objects returned by the .shape property may differ. For each given path where all members are port members, the reset values of all members with the same path must match. For each given path where all members are port members, exactly one member has an Out flow. If the In port member is a signal, it is connected to the Out port member with the same path as follows: m.d.comb += input_port.eq(output_port) If the In port member is a constant, no connection is actually made. The Out port member with the same path (if any) must be a constant with the same value. Forwarding interfaces In some cases, an outer elaboratable object creates an inner elaboratable object and exposes an interface of the inner object as its own: class Outer(Component): bus: Out(BusSignature()) def __init__(self): super().__init__() self.inner = Inner() def elaborate(self, platform): m = Module() m.d.comb += [ self.inner.bus.addr.eq(self.bus.addr), self.inner.bus.w_data.eq(self.bus.w_data), self.bus.r_data.eq(self.inner.bus.r_data), # ... ] return m class Inner(Component): bus: Out(BusSignature()) ... In this case, amaranth.lib.wiring.connect(...) won't help, since an output needs to be connected to an output, and an input to an input. An additional function amaranth.lib.wiring.flipped(obj) is added to assist in this case. It returns a proxy object obj_flipped where obj_flipped.signature equals obj.signature.flip(), and everything else is forwarded identically otherwise. So, the Outer.elaborate method can be rewritten as: class Outer(Component): bus: Out(BusSignature()) def __init__(self): super().__init__() self.inner = Inner() def elaborate(self, platform): m = Module() connect(m, flipped(self.bus), self.inner.bus) return m Component definition This RFC in effect introduces a particular kind of elaboratable object: one that has a signature. While connecting an elaboratable as a whole (as opposed to its sub-interfaces) will rarely, if ever, happen, it is still convenient to have an elaboratable define its signature, for three reasons: It is a declaration of intent, separating the signals that are purposefully a part of its interface from ones that just happen to be assigned to attributes, and stating their direction; It simplifies and standardizes assignment of the interface attributes, making the signature property the single source of truth for the module's interface; It makes it easy to convert a single standalone elaboratable to Verilog. To this end, a class amaranth.lib.wiring.Component is introduced: Component.__init__ (typically called as super().__init__()) updates self.__dict__ with the result of self.signature.members.create(). (If there is a name conflict, it raises an error.) Component.signature collects PEP 526 variable annotations in the class's method resolution order chain up to Component, if any, and returns a signature object constructed from these, or raises an error otherwise. The signature object is created per-instance, not per-class, so that it can be safely mutated if this is a part of the workflow. Alternatives and rationale Do nothing. Record will continue to be used alongside the continued proliferation of ad-hoc implementations of similar functionality, and continue to impair the use of Amaranth components together. Replace the amaranth.lib.wiring.connect free function with a function amaranth.hdl.dsl.Module.connect. It is not a function on amaranth.hdl.dsl.Module to avoid privileging the standard interface library over any other library that may be written downstream. At the moment nothing in amaranth.lib is special in any way other than its name, and preserving this is valuable to the author. Naming questions Should amaranth.lib.wiring be called something else, like amaranth.lib.bus or amaranth.lib.component? bus is short, but not every interface is a bus interface; component (or module, really) puts too much emphasis on the things being interfaced, rather than the interfaces (@jfng) i wouldn't want the bus keyword to already be taken in my namespaces (@jfng) I guess my point is mostly that bus is not the opposite of data, but wiring is (@whitequark) I don't like how long \"component\" is (@whitequark) Should Signature.compatible be named something else, like Signature.is_implemented_by, Signature.is_compliant, Signature.complies_with? Signature.compatible misses an is_ and does not look like a query method (@jfng) I mean, \"compatible\" could mean that two signatures could be connected together. when checking if an object is compliant to a signature, directions also matters (@zyp) Signature.complies_with reverses subject and object (@zyp) Signature.is_implemented_by is verbose (@jfng) Should amaranth.lib.wiring.forward be named something else, like amaranth.lib.wiring.forwarded or amaranth.lib.wiring.forwarding or amaranth.lib.wiring.flip or amaranth.lib.wiring.transpose or ``amaranth.lib.wiring.transposeoramaranth.lib.wiring.inner`? having two essentially unrelated operations called flip when one is already confusing is too much (@whitequark) reflective programming is a thing (@zyp) inner(inner(interface)) to flip it back to the original wouldn't make much sense (@zyp) Future work One-to-many connections between interfaces are currently provided only with a fan-out topology: a single interface with output members only can be connected with multiple interfaces with input members only. This avoids the question of what to do with an input that must be driven by multiple outputs. The interface library could be enriched by adding a small amount of fixed fan-in topologies, e.g. wired-OR and wired-AND, specified as a Member() constructor parameter that must match between all of the respective members.","breadcrumbs":"0002-interfaces","id":"2","title":"0002-interfaces"},"3":{"body":"Start Date: 2023-02-27 RFC PR: amaranth-lang/rfcs#3 Amaranth Issue: amaranth-lang/amaranth#756 Enumeration shapes Amendments The behavior described in this RFC was updated by RFC #4 . Summary Allow explicitly specifying shape for enumerations as an alternative to implicitly inferring it. Motivation Hardware development includes a lot of enumerated values, so first class support for enumerations is important, and so is integration with the standard Python mechanisms for specifying enumerations. Amaranth accepts enum.Enum subclasses anywhere a shape is expected, and enum.Enum instances anywhere a value is expected: >>> from amaranth import *\n>>> from enum import Enum\n>>> class Kind(Enum):\n... MUL = 0\n... ADD = 1\n... SUB = 2\n...\n>>> Shape.cast(Kind)\nunsigned(2)\n>>> Value.cast(Kind.SUB)\n(const 2'd2) However, this does not cover an important use case: a enumeration where many values are reserved. For example, if the Kind enumeration above may need to be extended in the future, it would be necessary to reserve space for additional values, which may require additional storage bits. Right now there is no way to specify that Kind should be cast to e.g. unsigned(4). Guide-level explanation The Amaranth standard library module, amaranth.lib.enum can be used as a drop-in replacement for the Python standard library enum module. It exports the same classes as the ones provided by Python's enum (namely Enum, Flag, IntEnum, and IntFlag) and provides the same functionality, adding the possibility of specifying a shape for the enumeration when it is defined: >>> from amaranth.lib.enum import Enum\n>>> class Kind(Enum, shape=unsigned(4)):\n... MUL = 0\n... ADD = 1\n... SUB = 2\n...\n>>> Shape.cast(Kind)\nunsigned(4)\n>>> Value.cast(Kind.SUB)\n(const 4'd2) If the shape= keyword argument is not specified, the enumeration is treated exactly the same as the corresponding standard Python class. If the values specified for the members are not representable with the explicitly provided shape, a warning is emitted: >>> class Funct3(Enum, shape=unsigned(3)):\n... SUB = 8\n...\n:1: RuntimeWarning: Value of enumeration member will be truncated to enumeration shape unsigned(3)\n>>> class Funct3(Enum, shape=unsigned(3)):\n... SUB = -1\n...\n:1: RuntimeWarning: Value of enumeration member is signed, but enumeration shape is unsigned(3) A shape that is specified for a base class will be inherited in subclasses: >>> class Enum3(Enum, shape=unsigned(3)): pass\n...\n>>> class Funct3(Enum3):\n... SUB = 2\n...\n>>> Shape.cast(Funct3)\nunsigned(3) If a enumeration without an explicitly defined shape is used in a concatenation, a warning is emitted: >>> class Kind(Enum):\n... ADD = 1\n...\n>>> Cat(Kind.ADD)\n:1: SyntaxWarning: Argument #1 of Cat() is an enumeration Kind.ADD without a defined shape used in bit vector context; define the enumeration by inheriting from the class in amaranth.lib.enum and specifying the 'shape=' keyword argument\n(cat (const 1'd1)) Reference-level explanation The Amaranth standard library module, amaranth.lib.enum, exports all of the public names of the Python standard library enum module. The EnumMeta class adds the functionality for storing and casting to shapes, and inherits from ShapeCastable. The Enum, Flag, IntEnum, and IntFlag classes in this module derive from enum.Enum, enum.Flag, enum.IntEnum, and enum.IntFlag respectively, and use amaranth.lib.enum.EnumMeta as their metaclass, which makes subclasses of amaranth.lib.enum.Enum, etc be instances of ShapeCastable. When a new amaranth.lib.enum.Enum subclass is defined, amaranth.lib.enum.EnumMeta.__new__ checks that the enumeration members are valid (currently, Amaranth requires these to be integers), and if the shape= argument is provided, stores it in an internal attribute. Importantly, the attribute is only set if the argument is provided, making it possible to distinguish these cases later. It also checks that all of the members can be represented by the given shape. When an amaranth.lib.enum.Enum subclass is cast to a shape, if the internal attribute is set, the shape in it is returned. Otherwise it is cast to a shape using exactly the same logic as what Shape.cast uses for enum.Enum subclasses. When an instance of a enum.Enum subclass is used in a concatenation, and it is not an instance of ShapeCastable, or if it lacks the _amaranth_shape_ attribute, a warning is emitted. This approach avoids a circular dependency between amaranth.hdl.ast and amaranth.lib.enum. Drawbacks Introducing a new standard library module increases the API surface. The names of enumeration base classes are the same as the standard library enumeration base classes, which may be confusing. Deriving from a different class requires changes to the enumeration at its point of definition, meaning that it is not possible to annotate a enum that comes from an external library with an Amaranth shape. Rationale and alternatives Ultimately, this feature boils down to defining an internal variable on an enum, which is then used by Shape.cast and other core Amaranth code. There are a few possible options for doing this. Special class variable: class SomeEnum(enum.Enum): _amaranth_shape_ = unsigned(4) Class decorator: @amaranth.shape(unsigned(4))\nclass SomeEnum(enum.Enum): Class keyword argument (this proposal): class SomeEnum(amaranth.lib.enum.Enum, shape=unsigned(4)): Alternative (1) has the following drawbacks: It is not possible to check that the enumeration members can be represented by the specified shape at the point of definition. It exposes what should be an implementation detail to the user. The documentation for the standard enum module does not specify whether it's OK to use _sunder_ names for one's own purposes, but it would have to be a part of the stable API. Its advantages are: No additional methods or classes in the API surface. _amaranth_shape_ makes it immediately clear what's going on. The variable can be defined on any enum, even an external one. Alternative (2) has the following drawbacks: It's not clear where the shape decorator should be. It can only be applied to enums, but there's no enum-specific namespace in Amaranth core to put it into. SomeEnum would inherit from the standard Enum class and therefore isinstance(SomeEnum, ShapeCastable) would be False unless ShapeCastable.__instancecheck__ is overridden to fix that. Its advantages are: The decorator can be applied to an external enum. Alternative (3) has the drawbacks specified above, and the following advantages: isinstance(SomeEnum, ShapeCastable) naturally works. As a consequence, no additional code is required in the core language. All of the functionality necessary for the feature to work lives in amaranth.lib.enum. The shape argument matches Signal(shape=) (even though no one uses the keyword form) and works the way one would naturally expect. Uses of import enum can be transparently replaced with from amaranth.lib import enum without updating the call sites, making the migration as easy as the other alternatives. Prior art None. Unresolved questions None. Future possibilities None.","breadcrumbs":"0003-enumeration-shapes","id":"3","title":"0003-enumeration-shapes"},"4":{"body":"Start Date: 2023-02-07 RFC PR: amaranth-lang/rfcs#4 Amaranth Issue: amaranth-lang/amaranth#755 Const-castable expressions Summary Define a subset of expressions that are \"const-castable\" and accept them in contexts where currently only integers and enumerations with integer values are accepted. Motivation In certain contexts, Amaranth requires a constant to be used. These contexts are: with m.Case(...):, Value.matches(...), and the value of an enumeration member that is being cast to a value. Currently, only integers and enumeration members with integer values are considered constants. However, this is too limiting. For example, when developing a CPU, one might want to define control signals for several functional units and combine them into instructions, or conversely, match an instruction against a combination of control signals: class Func(Enum): ADD = 0 SUB = 1 class Src(Enum): MEM = 0 REG = 1 class Instr(Enum): ADD = Cat(Func.ADD, Src.MEM) ADDI = Cat(Func.ADD, Src.REG) ... with m.Switch(instr): with m.Case(Cat(Func.ADD, Src.MEM)): ... Currently, all of these cases would produce syntax errors. There is a private Value._as_const method. It is not used internally, however Amaranth developers have started using it due to unmet needs. Removing it without providing a replacement would be disruptive, and will result in downstream codebases defining their own equivalent. Guide-level explanation In any context where a constant is accepted (with m.Case(...):, Value.matches(...), and the value of an enumeration member), a \"const-castable\" expression can be used. The following expressions are const-castable: int; Const; Cat where all operands are const-castable; instance of a Enum subclass where the value is const-castable. A const-castable expression can be converted to a Const using Const.cast: >>> Const.cast(1)\n(const 1'd1)\n>>> Const.cast(Cat(1, 0, 1))\n(const 3'd5)\n>>> Const.cast(Cat(Func.ADD, Src.REG))\n(const 2'd2) Reference-level explanation The Const.cast static method casts its argument to a value and examines it. If it is a Const, it is returned. If it is a const-castable expression, the operands are recursively cast to constants, and the expression is evaluated. The list of const-castable expressions is: Cat The m.Case(...) (through the Switch() constructor) and Value.matches(...) methods accept two kinds of operands: const-castable expressions, or a string containing a bit pattern (a sequence of 0, 1, or - meaning a wildcard). The Shape.cast method accepts enumerations where all members have const-castable expressions as their values. The shape of an enumeration is a shape with the smallest width that can represent the value of any enumeration member. RFC 3 : The EnumMeta.__new__ method accepts enumerations where all members have const-castable expressions as their values. The value of each member is the value of the constant resulting from casting the user-provided expression. Drawbacks A new language-level concept makes it harder to learn the language. Most developers already have an intuitive understanding of which expressions are const-castable. Const.cast shadows an existing Value.cast method since Const inherits from Value. No one is calling Value.cast through the Const.cast binding. Const.cast has a compatible interface (it returns a Value) and performs a similar function (it calls Value.cast first). However, it's not Liskov-compatible. Rationale and alternatives Alternatives: Do not add this functionality. Developers will define their own const-casting functions, continue to rely on the undocumented and private ._as_const() method, or use other workarounds. Make ._as_const() public (i.e. rename it to .as_const()). Add a new Const.cast method (this option). Alternatives (2) and (3) both introduce a new language-level concept, the only difference is in the interface that is used to access it. Alternative (3) fits the language better: Value.cast takes something value-castable and returns a Value, Shape.cast takes something shape-castable and returns a Shape, so Const.cast is a logical addition in that it takes something const-castable and returns a Const. Prior art Rust and C++ provide functionality (const fn and constexpr respectively) for performing computation at compile time, restricted to a strict subset of the full language. In particular, it can be used to initialize constants, which makes it similar to the functionality proposed here. One challenge these languages face is the question of how large the subset should be. Rust in particular started off heavily restricting const fn, where it did not have any control flow. The functionality was gradually introduced later as needed. Unresolved questions None. Future possibilities Expanding the set of const-castable expressions to include arbitrary arithmetic operations. This RFC limits it to the most requested expression, Cat. This simplifies implementation and reduces the likelihood of introducing bugs in the constant evaluation code, most of which would be almost never used.","breadcrumbs":"0004-const-castable-exprs","id":"4","title":"0004-const-castable-exprs"},"5":{"body":"Start Date: 2023-02-07 RFC PR: amaranth-lang/rfcs#5 Amaranth Issue: amaranth-lang/amaranth#754 Remove Const.normalize Summary Remove Const.normalize(value, shape). Motivation From the name it is not clear what it is supposed to achieve (it's truncation and inversion according to the shape) and it does not check types of arguments. We already have Const(value, shape).value and most developers should be aware of it. Having Const.normalize(value, shape) as well provides no benefit over the former. It's also longer. Explanation The Const.normalize method is deprecated (with the suggestion to use Const().value) and removed. Drawbacks Churn. Rationale and alternatives We could keep it. Removing it reduces the API surface and makes the language a bit more elegant. Prior art None. Unresolved questions None. Future possibilities None.","breadcrumbs":"0005-remove-const-normalize","id":"5","title":"0005-remove-const-normalize"},"6":{"body":"Start Date: 2023-05-31 RFC PR: amaranth-lang/rfcs#0006 Amaranth Issue: amaranth-lang/amaranth#681 CRC generator Summary Add a cyclic redundancy check (CRC) generator to the Amaranth standard library. Motivation Computing CRCs is a common requirement in hardware designs as they are used by a range of communication and storage protocols to detect errors and thereby ensure data integrity. Because of the standard structure and typical set of variations used by CRCs, it is readily possible to provide a general-purpose CRC generator in the standard library which should cover the majority of use cases efficiently. See the Wikipedia page on CRCs for more background and use cases. Guide-level explanation The Amaranth standard library includes a generator for a cyclic redundancy check (CRC) module, which can be used to compute and/or validate most common CRCs used by transmission and storage protocols. There are many different CRC algorithms in use, but they can almost all be described by the following parameters: The bit width of the CRC, commonly (but not always) a power of 2, The generator polynomial, represented as an integer where each bit is a 0 or 1 term in a binary-valued polynomial with as many terms as the CRC width, The initial value of the CRC register, commonly non-zero to allow detection of additional 0-valued data words at the start of a message, Whether to process input words least- or most-significant-bit first, allowing the CRC processing order to match the transmission or storage order of the data bits, Whether to flip the final output so that its least-significant-bit becomes the most-significant bit, set for the same reason as reflecting the input when the CRC value will also be transmitted or stored with a certain bit order, What value, if any, to XOR the output bits with before using the CRC value, often used to invert all bits of the output. This set of parameters is commonly known as the Williams or Rocksoft model. For more information, refer to \"A Painless Guide to CRC Error Detection Algorithms\" . For a list of parameters to use for standard CRCs, refer to: reveng 's catalogue, which uses the same parameterisation crcmod 's predefined list, but remove the leading 1 from the polynomials, XOR the \"Init-value\" with \"XOR-out\" to obtain initial_crc, and where Reversed is True, set both ref_in and ref_out to True. CRC Zoo , which only lists polynomials; use the \"explicit +1\" form but remove the leading 1. The CRC algorithms described in the reveng catalogue are also available in the Amaranth standard library in the crc.catalog module. In Amaranth, the crc.Algorithm class holds the parameters that describe a CRC algorithm: crc_width: the bit width of the CRC polynomial: the generator polynomial of the CRC, excluding an implicit leading 1 for the \"x^n\" term initial_crc: the initial value of the CRC, loaded when computation of a new CRC begins reflect_input: if True, input words are bit-reversed so that the least significant bit is processed first reflect_output: if True, the final output is bit-reversed so that its least-significant bit becomes the most-significant bit of output xor_output: a value to XOR the output with The crc.Algorithm class may be constructed manually, but for many commonly used CRC algorithms a predefined instance is available in the crc.catalog module. To fully define a CRC computation, the width of input data words to the CRC must also be specified. This is commonly 8 for processing byte-wise data, but can be any length greater than 0. The combination of a crc.Algorithm and the data_width makes a crc.Parameters instance, for example: from amaranth.lib import crc\nalgo = crc.Algorithm(crc_width=8, polynomial=0x2f, initial_crc=0xff, reflect_input=False, reflect_output=False, xor_output=0xff)\nparams1 = algo(data_width=8)\nparams2 = crc.catalog.CRC8_AUTOSAR(data_width=8) If not specified, the data width defaults to 8 bits. The crc.Parameters class can be used to compute CRCs in software with its compute() method, which is passed an iterable of integer data words and returns the resulting CRC value. from amaranth.lib import crc\nparams = crc.catalog.CRC8_AUTOSAR()\nassert params.compute(b\"123456789\") == 0xdf To generate a hardware CRC module, either call create() on crc.Parameters or manually construct a crc.Processor: from amaranth.lib import crc\nalgo = crc.Algorithm(crc_width=8, polynomial=0x2f, initial_crc=0xff, reflect_input=False, reflect_output=False, xor_output=0xff)\nparams = algo(data_width=8)\ncrc1 = m.submodules.crc1 = crc.Processor(params)\ncrc2 = m.submodules.crc2 = crc.Catalog.CRC8_AUTOSAR().create() The crc.Processor module begins computation of a new CRC whenever its start input is asserted. Input on data is processed whenever valid is asserted, which may occur in the same clock cycle as start. The updated CRC value is available on the crc output on the clock cycle after valid. With the data width set to 1, a traditional bit-serial CRC is implemented for the given polynomial in a Galois-type shift register. For larger values of data width, a similar architecture computes every new bit of the CRC in parallel. The match_detected output signal may be used to validate data that contains a trailing CRC. If the most recently processed word(s) form a valid CRC for all the data processed since start, the CRC register will always contain a fixed value which can be computed in advance, and the match_detected output indicates whether the CRC register currently contains this value. Reference-level explanation The proposed new interface is: A crc.Algorithm class which holds the parameters for a CRC algorithm, all of which are passed to the constructor: crc_width: bit width of the CRC register polynomial: generator polynomial for CRC algorithm initial_crc: initial value of CRC at start of computation reflect_input: if True, input words are bit-reversed reflect_output: if True, output values are bit-reversed xor_output: value to XOR the CRC value with at output crc.Algorithm implements __call__(data_width=) which is used to create a crc.Parameters instance with the specified data width. A crc.Parameters class which is constructed using a crc.Algorithm and a data_width. crc.Parameters has the following methods: compute(data) performs a software CRC computation on data, an iterable of input data words, and returns the CRC value create() returns a crc.Processor instance preconfigured to use these parameters residue() returns the residue value for these parameters, which is the value left in the CRC register after processing an entire valid codeword (data followed by its own valid CRC) algorithm() returns an crc.Algorithm with the same settings as this crc.Parameters instance A crc.Processor class which inherits from Elaboratable and implements the hardware generator A crc.catalog module which contains instances of crc.Algorithm The hardware implementation uses the property that CRCs are linear, and so the new value of any bit of the CRC register can be found as a linear combination of the current state and all the input bits. By expressing the CRC computation as a linear system like this, we can then determine the boolean equation used to update each bit of the CRC in parallel. A software CRC calculator is implemented in Python in order to find these logic equations. The proposed CRC generator is already implemented and available in PR 681 . The docstrings and comments in it should explain its operation to a suitably technical level of detail. Drawbacks Users could always write their own CRC or use an external library; Amaranth does not need to provide one for them. However, since it's a very common requirement that we can satisfy efficiently for a lot of users, it seems reasonable to include in the standard library. Rationale and alternatives As far as I'm aware, the method here is the optimal technique for generating the logic equations required for this combinatorial CRC generation. One alternative to the combinatorial logic equations is to store intermediate values in a lookup table; the table needs to contain a CRC-sized value for every possible input value, and then the computation required is reduced to a table lookup, an XOR, and some bit shifts. For single-byte words this approach may be practical, but it is unlikely to be worthwhile with 16- or 32-bit words. Additionally, the table approach generally requires a latency of 2 cycles (one extra to perform the table lookup). It's possible this would give better timing in some circumstances, but at the cost of block RAM resources and latency. Prior art The specification chosen for the CRC parameters is a popular de-facto standard, and importantly the reveng catalogue lists suitable parameters for a wide range of standard CRCs. This particular implementation was written in 2020 and is extracted (with permission) from a proprietary codebase, where it is used to generate a variety of CRCs on FPGAs. One early public example of using Amaranth to generate CRCs is from Harmon Instruments , also in 2020, which has a similar construction but does not support the full set of CRC parameters. In general, I found many examples of implementations of specific CRCs in other HDLs, but few for generic generators. There are many software libraries for generating CRCs in most programming languages, but as they are not generating hardware their implementation details are not as relevant - small table lookups are popular as the tradeoffs there tend to favour word-at-a-time computations. Unresolved questions No outstanding unresolved questions. Future possibilities The data interface uses start, data, and valid signals. Eventually, this could be replaced with a Stream, once they are finalised. Currently the entire input data word must be valid together; there is no support for masking some bits off. In particular, such a feature could be useful for wide data paths where the underlying CRC computation is byte-wise, for example a 128-bit-wide data stream from a 10GbE MAC where the Ethernet FCS must be computed over individual bytes. However, the implementation complexity is high, the use cases seem more niche, and such a feature could be added in a backwards-compatible later revision. The software CRC computation only supports computing over an entire set of data. It would be possible to offer an API to permit incremental updates and finalisation.","breadcrumbs":"0006-stdlib-crc","id":"6","title":"0006-stdlib-crc"},"7":{"body":"Start Date: 2023-05-11 RFC PR: amaranth-lang/rfcs#8 Amaranth Issue: amaranth-lang/amaranth#772 Aggregate data structure extensibility Summary Provide well-defined extension points for the aggregate data structure library. Motivation RFC 1 introduces the aggregate data structure library, which allows using any shape-castable object as the shape of a field. Layouts do not consider the specific type of the shape-castable object. However, views do, and depending on whether it's a layout, a subclass of an aggregate class (Struct or Union), or any other shape-castable object, behavior differs: >>> from amaranth import *\n>>> from amaranth.lib.data import *\n>>> class S(Struct):\n... x: unsigned(1)\n...\n>>> layout = StructLayout({\n... \"a\": unsigned(1),\n... \"b\": ArrayLayout(unsigned(2), 4),\n... \"c\": S\n... })\n...\n>>> View(layout).a\n(slice (sig $signal) 0:1)\n>>> View(layout).b\n\n>>> View(layout).c\n<__main__.S object at 0x7f53e4693a30> At the moment this behavior is not well-defined and it special-cases the aggregate classes defined in amaranth.lib.data. Guide-level explanation Any shape-castable object can be used as the shape of a field in a layout. This includes another layout. If the object is a callable (provides a __call__ method), then when a view is accessed, the __call__ method will be called with a single argument, the slice of the underlying value, which will be returned by the view. A Layout is a callable that constructs a View from itself and the value. Reference-level explanation The Layout class has a method __call__. layout(value) is equivalent to View(layout, value). The View.__getitem__ method (and by extension View.__getattr__), after extracting a field from the layout, attempts to call field.shape.__call__(value_slice), where value_slice is the slice of the underlying value corresponding to the field. If there is no such method, it iteratively calls as_shape() on field.shape or the result of the previous call to as_shape() until an object is returned that has a __call__ method, or until an instance of Shape is returned. Drawbacks The syntax may be confusing. Using __call__ to implement construction is a widespread pattern in Python. Moreover, Struct and Union are classes, whose __call__ method forwards to __new__, so implementing this behavior would remove the special case for aggregate base classes without additional code. Rationale and alternatives This design is, as far as the author knows, the smallest possible addition that provides the largest possible extensibility and removes all special casing of aggregate base classes. That it requires no additional functionality to be implemented on the aggregate base classes indicates that it fits well into the existing design. Alternatives: Do not do this. Prior art None. Unresolved questions None. Future possibilities None.","breadcrumbs":"0008-aggregate-extensibility","id":"7","title":"0008-aggregate-extensibility"},"8":{"body":"Start Date: 2023-05-11 RFC PR: amaranth-lang/rfcs#9 Amaranth Issue: amaranth-lang/amaranth#771 Constant initialization for shape-castable objects Summary Add an extension point to shape-castable objects, for converting constant initializers (typically Python literals) to Amaranth constant expressions. Motivation RFC 1 specifies that the reset= argument of a View accepts structured data: flt_neg_reset = data.View(float32_layout, reset={\"sign\": 1}) This structured data is internally turned into an integer constant that is supplied to Signal(reset=). This mechanism is not exposed to Amaranth developers. However, this creates a clear unmet need, since at the moment there is no way to turn a layout and a field-to-value mapping into a constant integer for use elsewhere. For example, if a signal is created manually and not through the View, this will not work despite looking reasonable (the layout is shape-castable and can be supplied to Signal): flt_neg_reset_signal = Signal(float32_layout, reset={\"sign\": 1}) Guide-level explanation Shape-castable objects must, in addition to the mandatory .as_shape() method, implement a mandatory .const(value) method to define how a constant initializer (the reset value of a Signal or View) is converted to an Amaranth constant. This method is defined by shape-castable objects to convert arbitrary Python objects into Amaranth constants. For example, if a shape-castable object has complex internal structure, it can accept a dictionary with the values to be filled into various bits of this structure. If Shape implemented ShapeCastable, the method would be defined as def const(self, value): return Const(value, self). The value returned by this method can be a Const or a value-castable object whose .as_value() will return a Const. This method can also be directly called by the developer to construct a constant using a given shape-castable object. Reference-level explanation A method def const(self, obj): is added on ShapeCastable. The Signal(shape, reset=) constructor is changed so that if isinstance(shape, ShapeCastable), then shape.const(reset) is used instead of reset. The .const() instance method is implemented on Layout to accept a Sequence or Mapping instance and returns a View over a Const with a bit pattern that has the fields set to the given values. Overlapping fields are written in the order of iteration of the input. If the field shape is a shape-castable object, then the value for that field is computed using Const.cast(value, field.shape). The .const() method is implemented on the metaclass of Struct and Union as return View(self, self.as_shape().const(obj)). The View(..., reset=) constructor is changed to pass reset through to the Signal() constructor. Drawbacks Additional method on ShapeCastable. It was clear from the beginning that this functionality will likely be necessary, and we are unlikely to ever add more. The reset= argument becomes dependently typed. Rationale and alternatives Given: class Point(Struct): x: 16 y: 16 it is clear that there needs to be some way to go from {\"x\": 123, \"y\": 456} to Cat(C(123, 16), C(456, 16)) without manually writing out the concatenation. There are two main options for this: Implement a new method, such that Point.const({\"x\": 123, \"y\": 456}) returns a constant of some kind (either an int or a Const or a constant-castable expression). Implement an additional .__init__() override, such that Point({\"x\": 123, \"y\": 456}) returns a view that has a constant-castable expression as its target. Option (1) has the benefit of making it clear when downstream code is creating a constant (and expects an argument where the nested data must all be constant), and of minimizing useless wrapping/unwrapping of views that would otherwise happen. It is an explicit type conversion (from a literal to Const). Option (2) avoids introducing new names. It is an implicit type conversion (from a literal to a view, which in this case is Point). In the end, option (1) seems preferable here since implicit type conversions are easy to unintentionally misuse. It also avoids any clashes with proposed RFC 8. Prior art None. Unresolved questions None. Future possibilities None.","breadcrumbs":"0009-const-init-shape-castable","id":"8","title":"0009-const-init-shape-castable"},"9":{"body":"Start Date: 2023-05-11 RFC PR: amaranth-lang/rfcs#10 Amaranth Issue: amaranth-lang/amaranth#770 Move Repl to Value.replicate Summary Replace the standalone Repl(value, count) node with value.replicate(count). Motivation Repl is a rarely used construct (it's mostly useful for manual sign extension). It is currently a first-class entity that has its own AST node and a name in the prelude, mostly for historical reasons (Repl(v, n) is analogous to Verilog's {x{n}}). Repl does not need to be a first-class entity; Repl(x, n) is almost exactly equivalent to Cat(x for x in range(n)). It especially does not need a name in the prelude. Guide-level explanation Use of Repl is deprecated. To replicate a value multiple times, use value.replicate(). Reference-level explanation Direct use of Repl is deprecated. Its implementation is replaced with def Repl(value, count): return Value.cast(value).replicate(count). A function Value.replicate(count) is added. It is implemented as Cat(value for _ in range(count)). The Repl AST node is removed. Drawbacks Churn. The proposed implementation makes Value.replicate valid on left-hand side of assignment, with potentially surprising behavior. However, this can be handled by prohibiting multiple assignment to the same bit of a signal in general. Rationale and alternatives Rationale: Fewer names in the prelude is always good. Unlike with Cat (where Cat() makes sense), Repl does not make sense as a standalone node any more than Part does (and we do not currently export Part). Despite existing by analogy with {x{n}}, it is currently turned into a concatenation before it reaches the Verilog backend anyway , and any future work will have to reconstruct replication from concatenation in any case. Repl being a dedicated node complicates AST processing for no reason. Alternatives: Do not do this. Prior art None. Unresolved questions None. Future possibilities The Verilog backend currently bitblasts what could be a replication. We could detect these and convert them to replications proper. 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Many changes, including bug fixes and documentation improvements can be implemented and reviewed via the normal GitHub pull request workflow. Some changes though are \"substantial\", and we ask that these be put through a bit of a design process and produce a consensus among the Amaranth community. Table of Contents Opening Table of Contents When you need to follow this process Before creating an RFC What the process is The RFC life-cycle Reviewing RFCs Implementing an RFC Acknowledgements License When you need to follow this process You need to follow this process if you intend to make \"substantial\" changes to core Amaranth language . In the future you will need to follow this process for the standard I/O library and the System-on-Chip library as well, but at the moment they are not covered. What constitutes a \"substantial\" change is evolving based on community norms and varies depending on what part of the ecosystem you are proposing to change, but may include the following: Any semantic or syntactic change to the language (amaranth.hdl) that is not a bugfix. Behavioral changes to the standard library (amaranth.lib). Behavioral changes to the toolchain interface (amaranth.vendor). Some changes do not require an RFC: Rephrasing, reorganizing, refactoring, or otherwise \"changing shape does not change meaning\". Additions that strictly improve objective, numerical quality criteria (warning removal, speedup, better platform coverage, handling more errors, etc.) If you submit a pull request to implement a new feature without going through the RFC process, it may be closed with a polite request to submit an RFC first. When in doubt, please open an issue to discuss the feature first and one of the core maintainers will say if the change requires an RFC or not. Before creating an RFC A hastily-proposed RFC can hurt its chances of acceptance. Low quality proposals, proposals for previously-rejected features, or those that don't fit into the near-term roadmap, may be quickly rejected, which can be demotivating for the unprepared contributor. Laying some groundwork ahead of the RFC can make the process smoother. Although there is no single way to prepare for submitting an RFC, it is generally a good idea to pursue feedback from other project developers beforehand, to ascertain that the RFC may be desirable; having a consistent impact on the project requires concerted effort toward consensus-building. The most common preparations for writing and submitting an RFC include talking the idea over on our IRC channel, #amaranth-lang at libera.chat , or opening an issue on the corresponding repository to gather feedback. What the process is In short, to get a major feature added to Amaranth, one must first get the RFC merged into the RFC repository as a markdown file. At that point the RFC is \"active\" and may be implemented with the goal of eventual inclusion into Amaranth. Fork the RFC repository. Copy 0000-template.md to text/0000-my-feature.md (where \"my-feature\" is descriptive). Don't assign an RFC number yet; This is going to be the PR number and we'll rename the file accordingly if the RFC is accepted. Fill in the RFC. Put care into the details: RFCs that do not present convincing motivation, demonstrate lack of understanding of the design's impact, or are disingenuous about the drawbacks or alternatives tend to be poorly-received. Submit a pull request. As a pull request the RFC will receive design feedback from the larger community, and the author should be prepared to revise it in response. Now that your RFC has an open pull request, use the issue number of the PR to update your 0000- prefix to that number. Build consensus and integrate feedback. RFCs that have broad support are much more likely to make progress than those that don't receive any comments. Feel free to reach out to the RFC assignee in particular to get help identifying stakeholders and obstacles. RFCs rarely go through this process unchanged, especially as alternatives and drawbacks are shown. You can make edits, big and small, to the RFC to clarify or change the design, but make changes as new commits to the pull request, and leave a comment on the pull request explaining your changes. Specifically, do not squash or rebase commits after they are visible on the pull request. At some point, a core maintainer will make a decision on the disposition for the RFC (merge, close, or postpone). This step is taken when enough of the tradeoffs have been discussed that the core maintainer is in a position to make a decision. That does not require consensus amongst all participants in the RFC thread (which is usually impossible). However, the argument supporting the disposition on the RFC needs to have already been clearly articulated, and there should not be a strong consensus against that position. The RFC life-cycle Once an RFC becomes \"active\" then authors may implement it and submit the feature as a pull request to the corresponding repository. Being \"active\" is not a rubber stamp, and in particular still does not mean the feature will ultimately be merged; it does mean that in principle all the major stakeholders have agreed to the feature and are amenable to merging it. Furthermore, the fact that a given RFC has been accepted and is \"active\" implies nothing about what priority is assigned to its implementation, nor does it imply anything about whether a developer has been assigned the task of implementing the feature. While it is not necessary that the author of the RFC also write the implementation, it is by far the most effective way to see an RFC through to completion: authors should not expect that other project developers will take on responsibility for implementing their accepted feature. Modifications to \"active\" RFCs can be done in follow-up pull requests. We strive to write each RFC in a manner that it will reflect the final design of the feature; but the nature of the process means that we cannot expect every merged RFC to actually reflect what the end result will be at the time of the next major release. In general, once accepted, RFCs should not be substantially changed. Only very minor changes should be submitted as amendments. More substantial changes should be new RFCs, with a note added to the original RFC. Exactly what counts as a \"very minor change\" is up to the core maintainers to decide. Reviewing RFCs While the RFC pull request is up, the core maintainers may schedule meetings with the author and/or relevant stakeholders to discuss the issues in greater detail, and the topic may be discussed at weekly meetings. In either case a summary from the meeting will be posted back to the RFC pull request. A core maintainer makes final decisions about RFCs after the benefits and drawbacks are well understood. These decisions can be made at any time, but the core maintainer will regularly issue decisions. When a decision is made, the RFC pull request will either be merged or closed. In either case, if the reasoning is not clear from the discussion in thread, the core maintainer will add a comment describing the rationale for the decision. Implementing an RFC Some accepted RFCs represent vital features that need to be implemented right away. Other accepted RFCs can represent features that can wait until some arbitrary developer feels like doing the work. Every accepted RFC has an associated issue tracking its implementation in the corresponding repository. The author of an RFC is not obligated to implement it. Of course, the RFC author (like any other developer) is welcome to post an implementation for review after the RFC has been accepted. If you are interested in working on the implementation for an \"active\" RFC, but cannot determine if someone else is already working on it, feel free to ask (e.g. by leaving a comment on the associated issue). RFC Postponement Some RFC pull requests are tagged with the \"postponed\" label when they are closed (as part of the rejection process). An RFC closed with \"postponed\" is marked as such because we want neither to think about evaluating the proposal nor about implementing the described feature until some time in the future, and we believe that we can afford to wait until then to do so. Postponed pull requests may be re-opened when the time is right. We don't have any formal process for that, you should ask a core maintainer. Usually an RFC pull request marked as \"postponed\" has already passed an informal first round of evaluation, namely the round of \"do we think we would ever possibly consider making this change, as outlined in the RFC pull request, or some semi-obvious variation of it.\" (When the answer to the latter question is \"no\", then the appropriate response is to close the RFC, not postpone it.) Acknowledgements The process described in this document is based on the Rust RFC process . It has been simplified to match the needs of the much smaller Amaranth community; in particular, policy (including the RFC process itself) is not currently defined through the RFC process. License This repository is licensed under the MIT license .","breadcrumbs":"Introduction","id":"0","title":"Introduction"},"1":{"body":"Start Date: 2023-02-14 RFC PR: amaranth-lang/rfcs#1 Amaranth Issue: amaranth-lang/amaranth#748 Aggregate data structure library Amendments The behavior described in this RFC was updated by RFC #8 , RFC #9 , and RFC #15 . Summary Add a rich set of standard library classes for accessing hierarchical aggregate data an idiomatic way, to fill one of the two major use cases of Record while avoiding its downsides. See also RFC #2 . Motivation Amaranth has a single data storage primitive: Signal. A Signal can be referenced on the left hand and the right hand side of an assignment, and so can be its slices. Although a signal serves the role of a numeric and bit container type fine, designs often include signals used as bit containers whose individual bits are named and have unique meanings. A mechanism that allows referring to such bit fields by name is essential. Currently, the role of this mechanism is served by Record. However, Record has multiple major drawbacks: Record attempts to do too much: it is both a mechanism for controlling representation (including implicitly casting a record to a value) and a mechanism for defining interfaces (specifying signal directions and facilitating connections between records). These mechanisms should be defined separately, since the only aspect they have in common is using a container class that consists of multiple named fields. Conflating the two mechanisms constraints the design space, making addressing the other drawbacks impossible, and the ill-defined scope encourages bugs in downstream code. Record has limited composability: records can only be nested within each other. Practical designs (in particular, implementations of protocols) use data with complex representation beyond nested sequences of fields: these include overlaid sequences of fields (where interpretation alternates based on some discriminant) and arrays of fields (where a field can be indexed by a non-constant), where any individual field can have a complex representation itself. Record is structured as a sequence of Signals, which is a part of its API. As such, it cannot support overlaid fields, and implementing support for arrays of fields is challenging. Record has limited introspectability: while its layout member can be accessed to enumerate its fields, the results do not include field boundaries, and the types of the returned shape-castable objects are preserved only as an implementation detail. Layout objects themselves are also not shape-castable. Record and Layout are structured as a sequence of Signals rather than a view into an underlying bit container, which is reflected in its API. Thus, Layout does not fit into Amaranth's data model, which concerns individual values. Record comes with its own storage: while its fields argument can be used to substitute the signals that individual fields are pointing to (in an awkward and error-prone way), it is still a collection of Signals. Using Record to impose structure on an existing Value requires a Module and a combinatorial assignment. This is an unnecessary complication, especially in helper functions. Record does not play well with Python's type annotations. Amaranth developers often inherit from Record as well as Layout, but in both cases the class definition syntax is usually little more than a way to define a callable returning a Record with a specific layout, and provides no benefits for IDE users. Record reserves a lot of names, including commonly used names like connect, any, all, and matches. Conversely, it defines a lot of arithmetic methods that are rarely if ever used on field containers. Layout's DSL is very amorphous. It passes around variable length tuples. The second element of these tuples (the shape) can be another Layout, which is neither a shape nor a shape-castable object. Neither Record nor Layout allow defining fields whose shapes are arbitrary ShapeCastable classes. Since these drawbacks are entrenched in the public API and heavily restrict usefulness of Record as a mechanism for specifying data representation, a new mechanism must replace it. Overview and examples This section shows a bird's eye view of the new syntax and behavior proposed in this RFC. The detailed design is described afterwards. from amaranth import *\nfrom amaranth.lib import data # Declaring a simple structure:\nclass Float32(data.Struct): fraction: unsigned(23) exponent: unsigned(8) sign: unsigned(1) # Defining a signal with the structure above:\nflt_a = Float32() # Reinterpreting an existing value with the same structure:\nflt_b = Float32(Const(0b00111110001000000000000000000000, 32)) # Referencing and updating structure fields by name:\nwith m.If(flt_b.fraction > 0): m.d.comb += [ flt_a.sign.eq(1), flt_a.exponent.eq(127) ] # Declaring a simple union, referencing an existing structure:\nclass FloatOrInt32(data.Union): float: Float32 int: signed(32) # Using the union to bitcast an IEEE754 value from an integer:\nf_or_i = FloatOrInt32()\nis_sub_1 = Signal()\nm.d.comb += [ f_or_i.int.eq(0x41C80000), is_sub_1.eq(f_or_i.float.exponent < 127) # => 1\n] class Op(enum.Enum): ADD = 0 SUB = 1 # Programmatically declaring a structure layout:\nadder_op_layout = data.StructLayout({ \"op\": Op, \"a\": Float32, \"b\": Float32\n}) # Using the layout defined above to define appropriately sized storage...\nadder_op_storage = Signal(adder_op_layout)\nlen(adder_op_storage) # => 65 # ... and wrap it for the fields to be accessible.\nadder_op = data.View(adder_op_layout, adder_op_storage)\nm.d.comb += [ adder_op.op.eq(Op.SUB), adder_op.a.eq(flt_a), adder_op.b.eq(flt_b)\n] Detailed design This RFC proposes a number of language and library additions: Adding a ShapeCastable interface, similar to ValueCastable; Adding classes that hierarchically describe representation of aggregate values: named field containers with non-overlapping fields (structs), named field containers with overlapping fields (unions), and indexed field containers (arrays); Adding a wrapper class that accepts a Value (or a ValueCastable object) and provides accessors that slice it according to the corresponding aggregate representation; Adding an ergonomic and IDE-compatible interface for building descriptions of non-parametric layouts of aggregate values. User-defined shape-castable objects ShapeCastable is an interface for defining Shape-like values outside of the core Amaranth language. It is functionally identical to ValueCastable, and could be used like: from amaranth import * class Layout(ShapeCastable): def __init__(self, fields): self.fields = fields def as_shape(self): return unsigned(sum(len(field) for field in self.fields)) Value layout descriptions Aggregate value layouts are represented using two classes: amaranth.lib.data.Field and amaranth.lib.data.Layout: A Field(shape_castable, offset=0) object describes a field of the given shape starting at bit number offset of the aggregate value. A Layout() object describes an abstract aggregate value. It can be iterated, returning (name, field) or (index, field) pairs; or indexed (__getitem__) by the name or index of the field. It has a .size in bits, determined by the type of the layout, and is shape-castable, being converted to unsigned(layout.size()). A StructLayout(members={\"name\": shape_castable}) object describes an aggregate value with non-overlapping named fields (struct). The fields are placed at offsets such that they immediately follow one another, from least significant to most significant. A UnionLayout(members={\"name\": shape_castable}) object describes an aggregate value with overlapping named fields (union). The fields are placed at offset 0. An ArrayLayout(element=shape_castable, length=1) object describes an aggregate value with indexed fields (array). The fields all have identical shape and are placed at offsets such that they immediately follow one another, from least significant to most significant. A FlexibleLayout(fields={\"name\": field, 0: field}, size=16) object describes a aggregate value with fields arbitrarily placed within its bounds. The representation of a discriminated union could be programmatically constructed as follows: import enum\nfrom amaranth.lib import data class Kind(enum.Enum): ONE_SIGNED = 0 TWO_UNSIGNED = 1 layout = data.StructLayout({ \"kind\": Kind, \"value\": data.UnionLayout({ \"one_signed\": signed(2), \"two_unsigned\": data.ArrayLayout(unsigned(1), 2) })\n}) Aggregate value access Aggregate values are manipulated through the amaranth.lib.data.View class. A View(layout, value_castable) object wraps a value-castable object (which may be a valid assignment target) and provides access to fields according to the layout. A view is itself value-castable, being converted to the object it's wrapping. If the view is wrapping a valid assignment target, then the accessors also return a valid assignment target. Fields can be accessed using either __getitem__ (for both named and indexed fields) or __getattr__ (for named fields). To avoid name collisions when using __getattr__ to access fields, views do not define any non-reserved attributes of their own except for the .as_value() casting method. Field names starting with _ are reserved as attribute names and and can only be accessed using the view[\"name\"] indexing syntax. When a view is used to access a field whose shape is an ordinary Shape object, the accessor returns a Value of the corresponding shape that slices the viewed object. When a view is used to access a field whose shape is an aggregate value layout, the accessor returns another View with this layout, wrapping the slice of the viewed object. For fields that have any other shape-castable object set as their shape, the behavior is the same as for the Shape case. Views that have an ArrayLayout as their layout can be indexed with a Value. In this case, the viewed object is sliced with Value.word_select. A signal can be manipulated with its structure viewed as the discriminated union defined above as follows: # creates an unsigned(3) signal by shape-casting `layout`\nsig = Signal(layout)\nview = data.View(layout, sig) # if the second argument is omitted, a signal with the right shape is created internally;\n# the line below is equivlent to the two lines above\nview = data.View(layout) m = Module()\nm.d.comb += [ view.kind.eq(Kind.TWO_UNSIGNED), view.value.two_unsigned[0].eq(1),\n] Ergonomic layout definition Rather than using the underlying StructLayout and UnionLayout classes, struct and union layouts can be defined using the Python class definition syntax, with the shapes of the members specified using the PEP 526 variable annotations: class SomeVariant(data.Struct): class Value(data.Union): one_signed: signed(2) two_unsigned: data.ArrayLayout(unsigned(1), 2) kind: Kind value: Value # this class can be used in the same way as a `data.View` without needing to specify the layout:\nview2 = SomeVariant()\nm.d.comb += [ view2.kind.eq(Kind.ONE_SIGNED), view2.value.eq(view.value)\n] When they refer to other structures or unions defined in the same way, the variable annotations are also valid PEP 484 type hints, and will be used by IDEs to derive types of properties and expressions. Otherwise, the annotations will be opaque to IDEs or type checkers, but are still useful for a human reader. The classes defined in this way are shape-castable and can be used anywhere a shape or a aggregate value layout is accepted: sig2 = Signal(SomeVariant)\nlayout2 = data.StructLayout({ \"ready\": unsigned(1), \"payload\": SomeVariant\n}) Implementation note: This can be achieved by using a custom metaclass for Struct and Union that inherits from ShapeCastable. If an explicit Layout object is nevertheless needed (e.g. for introspection), it can be extracted from the class using Layout.cast: layout == data.Layout.cast(SomeVariant) # => True Conversely, the shape-castable object defining the layout of a View (which might be a Layout subclass or a Struct/Union subclass) can be extracted from the view using Layout.of: SomeVariant is data.Layout.of(view2) # => True Advanced usage: Parametric layouts The ergonomic definitions using the Struct and Union base classes are concise and integrated with Python type annotations. However, they cannot be used if the layout of an aggregate value is parameterized. In this case, a class with similar functionality can be defined in a more explicit way: class Stream8b10b(data.View): data: Signal ctrl: Signal def __init__(self, value=None, *, width: int): super().__init__(data.StructLayout({ \"data\": unsigned(8 * width), \"ctrl\": unsigned(width) }), value) len(Stream8b10b(width=1).data) # => 8\nlen(Stream8b10b(width=4).data) # => 32 Since the parametric class name itself does not have a fixed layout, it cannot be used with Layout.cast. Similarly, the type annotations cannot include specific field widths; they are included only to indicate the presence of a corresponding attribute to IDEs and type checkers. Structure field ordering The fields of a structure layout object are ordered from least significant to most significant: float32_layout = data.StructLayout({ \"fraction\": unsigned(23), # bits 0..22 \"exponent\": unsigned(8), # bits 23..30 \"sign\": unsigned(1) # bit 31\n}) class Float32(data.Struct): fraction: unsigned(23) # bits 0..22 exponent: unsigned(8) # bits 23..30 sign: unsigned(1) # bit 31 In other words, the following identity holds: float32_storage = Signal(float32_layout)\nfloat32 = data.View(float32_layout, float32_storage) float32_storage == Cat(float32.fraction, float32_layout.exponent, float32.sign) Customizing the automatically created Signal When a view is instantiated without an explicit view target, it creates a Signal with a shape matching the view layout. The View constructor accepts all of the Signal constructor keyword arguments and passes them along; the reset= argument accepts a struct or an array (according to the type of the layout): flt_neg_reset = data.View(float32_layout, reset={\"sign\": 1}) flt_reset_less = Float32(reset_less=True) Drawbacks This feature introduces a language-level concept, shape-castable objects, increasing language complexity. This feature introduces a finely grained hierarchy of 5 similar and related classes for describing layouts. Alternatives Do nothing. Record will continue to be used alongside the continued proliferation of ad-hoc implementations of similar functionality. Remove ArrayLayout from this proposal. The array functionality is niche and introduces the complexity of handling by-index accessors alongside by-name ones. Remove ArrayLayout, UnionLayout, and FlexibleLayout from this proposal. Their functionality is less commonly used than that of StructLayout and introduces the substantial complexity of handling fields at arbitrary offsets. (This would make amaranth.lib.data useless for slicing CSRs in Amaranth SoC.) This change would bring this proposal close to the original PackedStruct proposal discussed in https://github.com/amaranth-lang/amaranth/issues/342. Combine the Layout and all of its derivative classes into a single Layout(fields={\"name\": Field(...), 0: Field(...)}) class that provides a superset of the functionality. This simplifies the API, but makes introspection of aggregate layouts very difficult and can be inefficient if large arrays are used. In this case, factory methods of the Layout class would be provided for more convenient construction of regular struct, union, and array layouts. Remove Struct and Union annotation-driven definition syntax. This makes the API simpler, less redundant, and with fewer corner cases, also avoiding the use of variable annotations that are not valid PEP 484 type hints, at the cost of a continued jarring experience for IDE users. Include a more concise and less visually noisy way to build StructLayout and UnionLayout objects (or their equivalents) using a builder pattern. This may make the syntax slightly nicer, though the RFC author could not come up with anything that would actually be such. Bikeshedding The names of the Field, *Layout, and View classes could be changed to something better. IrregularLayout was renamed to FlexibleLayout. Future work This feature could be improved in several ways that are not in scope of this RFC: StructLayout, UnionLayout, and ArrayLayout could be extended to generate layouts with padding at the end (for structs and unions) or between elements (for arrays). Currently this requires the use of a FlexibleLayout. StructLayout could be extended to accept a list of fields in addition to a map of field names to values. In this case, it would represent an aggregate value with non-overlapping indexed fields (tuple). Struct and/or StructLayout could be extended to treat certain reserved field names (e.g. \"_1\", \"_2\", ...) as designating padding bits. In this case, the offset of the following fields would be adjusted, and the fields with such names would not appear in the layout. Struct and/or StructLayout could be extended to treat certain reserved field names (e.g. \"_\" for Struct and None for StructLayout) as designating an anonymous inner aggregate. In this case, the members of the anonymous inner aggregate would be possible to access as if they were the members of the outer aggregate. The automatic wrapping of accessed aggregate fields done by View could be extended to call a user-specified cast function rather than hard-coding a check for whether the shape is a Layout. This would allow seamless inclusion of user-defined value-castable types in aggregates. The PEP 484 generics could be used to define layouts parametric over field shapes, using type annotations alone. Since Python does not have type-level integers, layouts parametric over field sizes would still need to be defined explicitly. The struct, union, and enum support could be used as the building blocks to implement first-class discriminated unions. Discriminated unions will also benefit from tuples, described above. ( Suggestion by @lachlansneff.) Acknowledgements @modwizcode , @Kaucasus , and @lachlansneff provided valuable feedback while this RFC was being drafted.","breadcrumbs":"0001-aggregate-data-structures","id":"1","title":"0001-aggregate-data-structures"},"10":{"body":"Start Date: 2023-05-15 RFC PR: amaranth-lang/rfcs#15 Amaranth Issue: amaranth-lang/amaranth#784 Lifting shape-castable objects Summary Make Signal(shape_castable, ...) return shape_castable(Signal(shape_castable.as_shape(), ...)). Motivation When Amaranth was a very new language, it did not have any facilities for ascribing type information to data. It had shapes (width and signedness), and it had special handling for range() in the shape position, as well as enumerations. Back then it made sense to have Signal, the single way to define new storage of any kind, to only operate on values (numbers / bit containers). Today the situation is completely different. Amaranth has first-class support for enumerations in the standard library as well as the standard range of data structures (structs, unions, arrays) via RFC 1 and RFC 3 . It provides extensibility through RFC 8 and RFC 9 . Using the existing hooks alone it is possible to extend Amaranth with rich numeric types (fixed-point, complex, potentially even floating-point), and some of these are very likely to end up in the standard library. All of this new functionality internally wraps a Value. It is so common and useful to initialize e.g. a struct view with a fresh Signal that data.View reexports all of the arguments of the Signal constructors and automatically constructs a Signal if no view target is provided. This works, but ties the two together more than would be ideal, and requires every similar facility to reimplement the functionality itself. What is worse is that it seems to be quite confusing to programmers, since it's not apparent that calling data.View(foo_layout) internally creates a Signal. Furthermore, people want to call Signal(foo_layout) to construct some storage for foo_layout, and that works (foo_layout is shape-castable), but does the wrong thing: the returned object is a Signal, not a data.View. It would make teaching a lot easier if we could draw an equivalence between a Signal and a variable in a general purpose programming language, and between its shape and a type in a general purpose programming language. Then, no matter what shape-castable object it is, the way to make some storage is Signal(x). It will also simplify the internals a fair bit. This change wasn't practical before RFC 8 and RFC 9 laid the groundwork for it, but now it is an obvious extension. Guide-level explanation To include state in a design, use the Signal(shape) constructor, where shape describes the bit layout and possible operations on that state. The reset= argument and the returned value depend on the shape that is provided. If it is signed(N) or unsigned(N) or a built-in enumeration or a range, then a plain Value is returned, and the reset= argument accepts a number, an enumeration member, or a constant. If it is a data.Layout, then a data.View is returned, and the reset= argument accepts a sequence or a mapping, potentially nested for nested layouts. Other shape-castable classes will have their own behavior. Warning The existing syntax for creating a View with a new Signal underlying it will be removed immediately (it has never been in a release) to resolve an ambiguity over the semantics of __call__. Reference-level explanation A method def __call__(self, value): is added on ShapeCastable. It must return Value or a ValueCastable instance with the right shape. (Such a method is opportunistically used by data.View for nested views since RFC 8 , however this RFC makes it mandatory for all shape-castable objects.) The Signal.__call__(shape, ...) method is overridden (on the metaclass) to consider shape. First, a signal is constructed normally with all of the arguments. Afterwards, if shape is a ShapeCastable instance, then shape(signal) is returned. Otherwise signal is returned. Drawbacks Increase in language complexity. More metaclasses. Signal is a final class so this is unlikely to go wrong. A Signal() constructor sometimes returning non-Signal objects can be confusing. Rationale and alternatives There are several arguments in favor of the design: It does not de facto introduce any new methods on protocols, since ShapeCastable.__call__ is expected to be implemented by essentially everyone after RFC 8 . It does not introduce new complexity to Signal.__init__; the logic for handling non-integer reset exists since RFC 9 . It eliminates unnecessary coupling between data.View (and other similar facilities) and Signal(). It is a natural extension of the language and has clear parallels to the notion of variables in other languages. It has been repeatedly requested by users, almost every time someone became familiar with the aggregate data structure design. All of these points are compelling but the last one perhaps the most. The author did not find it a stark enough necessity to introduce themselves but it does seem to be one. Alternatives: Do not do this. The status quo is acceptable. Prior art This RFC brings the semantics of Signal to be very close to semantics of typed variables in other languages. \"Lifting\" in the title of this RFC refers to a concept in functional programming of the same name where a higher order function (Signal, here) is used to generalize an operation over a set of other functions (data.View and other shape-castable objects that implement the __call__ protocol, here). Unresolved questions How does this interact with typechecking? This is a straightforward higher order function so it's probably fine. Future possibilities This RFC is the final one in a chain that started with RFC 1 . Enumerations and ranges could be adjusted such that something other than Value is returned. This creates backwards compatibility concerns though.","breadcrumbs":"0015-lifting-shape-castables","id":"10","title":"0015-lifting-shape-castables"},"11":{"body":"Start Date: 2023-08-22 RFC PR: amaranth-lang/rfcs#18 Amaranth Issue: amaranth-lang/amaranth#873 Reorganize vendor platforms Summary Update amaranth.vendor namespace so that instead of: from amaranth.vendor.lattice_ecp5 import LatticeECP5Platform you would write: from amaranth.vendor import LatticeECP5Platform Motivation Vendor names are ever-changing. Xilinx was bought by AMD and the brand has been phased out. Altera was bought by Intel and the brand has been phased out. SiliconBlue has been bought by Lattice (a long time ago) and the brand has long been phased out but still remains as \"SB\" in SB_LUT primitive name. In addition, we attempt to group FPGA families into a single file, like vendor.lattice_machxo2_3l that has been renamed from vendor.lattice_machxo2. This will likely include another FPGA family as soon as it becomes available. By tying module (and file) names to brand names we create churn. Every Amaranth release so far has included renaming of both platform class names and module names. This causes additional downstream breakage and annoys designers using Amaranth. Guide-level explanation To target your FPGA-based project for a particular FPGA family, import the platform class corresponding to the FPGA family from amaranth.vendor, e.g.: from amaranth.vendor import LatticeECP5Platform Reference-level explanation All of the amaranth.vendor.name modules are renamed to amaranth.vendor._internal_name. Python allows __getattr__ to be present in modules: $ cat >x.py\ndef __getattr__(self, name): return f\"__getattr__({name!r})\"\n$ python\n>>> from x import abc\n>>> abc\n\"__getattr__('abc')\" This allows us to make all the platform classes be present as-if they were defined in the amaranth.vendor modules, while retaining all of the benefits of having them in their own amaranth.vendor._internal_name module, such as lazy loading. Drawbacks Churn. A somewhat unusual loading mechanism could cause confusion. Rationale and alternatives Decoupling marketing/brand names from technical names is increasingly important as Amaranth evolves and supports more FPGA families. It allows us to maintain any internal hierarchy we want without it having any impact on downstream code, which solely operates on names imported from amaranth.vendor. Prior art None. Unresolved questions None. Future possibilities None.","breadcrumbs":"0018-reorganize-vendor-platforms","id":"11","title":"0018-reorganize-vendor-platforms"},"12":{"body":"Start Date: 2023-08-22 RFC PR: amaranth-lang/rfcs#19 Amaranth Issue: amaranth-lang/amaranth#874 Remove amaranth.lib.scheduler Summary Remove amaranth.lib.scheduler and the only class RoundRobin in it. Motivation This module is not used in the sole place for which it was added (Amaranth SoC), it is not especially useful, and it has not undergone proper community review when it was added. Guide-level explanation The module amaranth.lib.scheduler and the sole class RoundRobin in it is removed. To continue using it, copy the contents of the module into your own project. Reference-level explanation The class amaranth.lib.scheduler.RoundRobin is deprecated in Amaranth 0.4 and removed in Amaranth 0.5. Drawbacks Churn. Rationale and alternatives This module is out of place in the standard library. It has not seen much use and is trivially implemented outside of it. Downstream consumers tend to inline the logic anyway. It does not seem like there would be any other uses for the amaranth.lib.scheduler module since any other scheduling algorithm would be more closely tied to the consumer. Unresolved questions None. Future possibilities None.","breadcrumbs":"0019-remove-scheduler","id":"12","title":"0019-remove-scheduler"},"13":{"body":"Start Date: 2023-08-22 RFC PR: amaranth-lang/rfcs#20 Amaranth Issue: amaranth-lang/amaranth#875 Deprecate non-FWFT FIFOs Summary Deprecate non-first-word-fall-through FIFOs. Motivation Currently, FIFOs in amaranth.lib.fifo have two incompatible interfaces: FWFT (first word fallthrough) and non-FWFT. The incompatibility concerns only the read half. FWFT FIFOs have r_data valid when r_rdy is asserted. Non-FWFT FIFOs have r_data valid only after strobing r_en, if the FIFO was empty previously. Non-FWFT interface is awkward and is essentially never used. It is a holdover from Migen and its implementation details that was included for compatibility. There are three downsides to having it: Having non-FWFT FIFOs requires every consumer of the FIFO interface to check for fwft when interacting with the FIFO and either asserting that it is True, or adding a code path to handle it. No one does this. The FWFT interface is directly compatible with streams and allows us to add e.g. r_stream and w_stream to existing FIFOs without adding a wrapper such as stream.FIFO. It also makes any custom FIFOs defined downstream of Amaranth stream-enabled. The notion of FWFT vs non-FWFT FIFOs is confusing and difficult to understand. E.g. the author of this RFC wrote both lib.fifo and the Glasgow FIFO code, and she misused the fwft argument in the latter. Guide-level and reference-level explanation In the next version, instantiating SyncFIFO(fwft=False) emits a deprecation warning. In addition, FIFOInterface's fwft parameter now defaults to True. Other FIFOs have no non-FWFT variant in the first place. In the version after that, there is no way to instantiate SyncFIFO(fwft=False). The feature and all references to it are removed in their entirety. Implementation considerations At the moment, SyncFIFOBuffered is implemented as a register in the output of SyncFIFO(fwft=False). The implementation will need to be rewritten. Drawbacks Churn. There will be no alternative to SyncFIFO(fwft=False). Rationale and alternatives It is feasible to extract SyncFIFO(fwft=False) into its own module that may be used by downstream code that needs non-FWFT FIFOs. It would not implement FIFOInterface. There is no reason the SyncFIFO class could not be copied into downstream code as it is. It is possible to wrap FIFOs in the stream library in a way that ensures only FWFT FIFOs are used. Let's not create pointless wrappers. Prior art Not relevant. Unresolved questions None. Future possibilities This RFC primarily exists to enable better stream interface integration.","breadcrumbs":"0020-deprecate-non-fwft-fifos","id":"13","title":"0020-deprecate-non-fwft-fifos"},"14":{"body":"Start Date: 2023-08-22 RFC PR: amaranth-lang/rfcs#21 Patch releases Summary Change Amaranth versioning from major.minor to major.minor.patch after version 0.4, and define the backport policy for patch releases. Motivation Amaranth 0.3 was released on 2021-12-16; almost two years ago. Several important bugs have been fixed in main since, most notably depending on a version of Jinja2 that is no longer installable. At the moment the policy is to issue only major.minor releases, which was OK in the early days but no longer fits the project. We should change the policy that is used for the next Amaranth release and later ones. Explanation Amaranth feature releases all have the version of major.minor.0. The policy for these releases is unchanged and is tied to our two-step process for making breaking changes. In addition to these releases, Amaranth now has bug-fix releases with the major.minor.patch versions. These are intended to address the need of the community to have bugs fixed before a next feature release can be made, and the policy is designed to minimize developer time spent on them. Bug-fix releases are made when all of the following conditions are satisfied: There is an issue that is fixed in the main branch. A member of the community requests this issue to be fixed in a point release. It is possible to fix the issue such that there is a high degree of confidence that the change will not break existing code using Amaranth with a ~=major.minor version constraint. A community member steps up to backport the fix to the release branch. This could be one of the Amaranth maintainers, or anyone else. Amaranth maintainers have no obligation to back-port any fix. Drawbacks This creates additional work for maintainers. Rationale and alternatives It would be possible to backport all feasible fixes as a policy. This would significantly increase maintainer workload. It is possible to keep the current policy. Because we do not control all of the upstream dependencies (including Python), this seems untenable. Prior art Rust has an even stricter bug-fix release policy: the Rust project only issues patch releases in cases of security issues, widespread miscompilations, or unintentional breaking changes. Unresolved questions Should Amaranth SoC adopt the same policy? Future possibilities Eventually, Amaranth may gain release engineers who will maintain long-living release branches.","breadcrumbs":"0021-patch-releases","id":"14","title":"0021-patch-releases"},"15":{"body":"Start Date: 2023-08-22 RFC PR: amaranth-lang/rfcs#22 Amaranth Issue: amaranth-lang/amaranth#876 Define ValueCastable.shape() Summary Require value-castable objects to have a method that returns their high-level shape. Motivation RFC #15 advanced the extensibility of the language significantly, but broke constructs like Signal.like(Signal(data.StructLayout(...))). In addition, not having a well-defined point for returning the high-level shape (i.e. a shape-castable object from which this value-castable object was creaed rather than a Shape instance) causes workarounds such as data.Layout.of to be added to the language and standard library. Explanation The ValueCastable interface has a method .shape(). This method returns a shape-castable object. Where possibe, this object should, when passed to Signal, create a value-castable object of the same type. amaranth.lib.data.Layout.of is removed immediately. Drawbacks Increased API surface area At one point a commitment was made that the only method ValueCastable will ever define will be as_value. However, radical changes to the language such as RFC #15 make it reasonable to revisit this. Rationale and alternatives This change is the minimal possible one that fixes the problem systemically. Some minor variations in the design are possible: Instead of requiring shape() to be defined (which is a breaking change), this method can be added optionally in the next release and be required in the release after that. This is difficult to do with ValueCastable and will require workarounds both in the core language implementation and in downstream code that operates on ValueCastable objects. ValueCastable is not very widely used yet and the breakage will likely be minimal. Prior art It is typical for a programming language to have a way of retrieving the type of a value. The mechanism being added here is equivalent. Unresolved questions None. Future possibilities None.","breadcrumbs":"0022-valuecastable-shape","id":"15","title":"0022-valuecastable-shape"},"16":{"body":"Start Date: 2023-10-30 RFC PR: amaranth-lang/rfcs#0028 Amaranth Issue: amaranth-lang/amaranth#0929 Allow overriding Value operators Summary Allow overriding binary Value operators with reflected operators in a value-castable type. Motivation A value-castable type can define operators that return another value-castable. However, if the left side operand is a Value, its operator will be called first, casting the right side operand to a plain Value. This creates a mismatch in behavior depending on the type and order of operands. As an example, consider the multiplication of a fixed point value-castable with an integral type: >>> Q(7).const(0.5) * 255\n(fixedpoint Q8.7 (* (const 8'sd64) (const 8'd255)))\n>>> 255 * Q(7).const(0.5)\n(fixedpoint Q8.7 (* (const 8'sd64) (const 8'd255)))\n>>> Q(7).const(0.5) * C(255)\n(fixedpoint Q8.7 (* (const 8'sd64) (const 8'd255)))\n>>> C(255) * Q(7).const(0.5)\n(* (const 8'd255) (const 8'sd64)) Explanation When a binary Value operator is called with a value-castable other, check whether the value-castable implements the reflected variant of the operator first and defer to it when present. Drawbacks Extra logic required around every Value operator. Prior art This is standard behavior for inheritance in Python : Note: If the right operand’s type is a subclass of the left operand’s type and that subclass provides a different implementation of the reflected method for the operation, this method will be called before the left operand’s non-reflected method. This behavior allows subclasses to override their ancestors’ operations. We don't get this behavior automatically because Value is not an ancestor of ValueCastable, but it would make sense for it to behave as it were. Rationale and alternatives As an alternative, Value and ValueCastable could be rearchitected so that ValueCastable inherits from either Value or a common base that implements the Value operators. This would make Python do the right thing w.r.t. operator overriding, but is a larger change with more potential for undesirable consequences. Unresolved questions None. Future possibilities Value.eq() could in the same manner check for and defer to a .req() method, i.e. reflected .eq(), to allow a value-castable to override how assignment from it to a Value is handled.","breadcrumbs":"0028-override-value-operators","id":"16","title":"0028-override-value-operators"},"17":{"body":"Start Date: 2023-11-27 RFC PR: amaranth-lang/rfcs#31 Amaranth Issue: amaranth-lang/amaranth#972 Enumeration type safety Summary Make Amaranth Enum and Flag use a custom ValueCastable view class, enforcing type safety. Motivation Python Enum provides an opaque wrapper over the underlying enum values, providing type safety and guarding against improper usage in arithmetic operations: >>> from enum import Enum\n>>> class EnumA(Enum):\n... A = 0\n... B = 1\n...\n>>> EnumA.A + 1\nTraceback (most recent call last): File \"\", line 1, in \nTypeError: unsupported operand type(s) for +: 'EnumA' and 'int' Likewise, Flag values can be used in bitwise operations, but only within their own type: >>> from enum import Flag\n>>> class FlagA(Flag):\n... A = 1\n... B = 2\n... >>> class FlagB(Flag):\n... C = 1\n... D = 2\n... >>> FlagA.A | FlagA.B\n\n>>> FlagA.A | FlagB.C\nTraceback (most recent call last): File \"\", line 1, in \nTypeError: unsupported operand type(s) for |: 'FlagA' and 'FlagB' However, these safety properties are not currently enforced by Amaranth on enum-typed signals: >>> from amaranth import *\n>>> from amaranth.lib.enum import *\n>>> class FlagA(Flag):\n... A = 1\n... B = 2\n... >>> class FlagB(Flag):\n... C = 1\n... D = 2\n... >>> a = Signal(FlagA)\n>>> b = Signal(FlagB)\n>>> a | b\n(| (sig a) (sig b)) Guide-level explanation Like in Python, Enum and Flag subclasses are considered strongly-typed, while IntEnum and IntFlag are weakly-typed. Enum-typed Amaranth values with strong typing are manipulated through amaranth.lib.enum.EnumView and amaranth.lib.enum.FlagView classes, which wrap an underlying Value in a type-safe container that only allows a small subset of operations. For weakly-typed enums, Value is used directly, providing full interchangeability with other values. An EnumView or a FlagView can be obtained by: Creating an enum-typed signal (a = Signal(MyEnum)) Explicitly casting a value to the enum type (MyEnum(value)) The operations available on EnumView and FlagView include: Comparing for equality to another view of the same enum type (a == b and a != b) Assigning to or from a value Converting to a plain value via Value.cast The operations additionally available on FlagView include: Binary bitwise operations with another FlagView of the same type (a | b, a & b, a ^ b) Bitwise inversion (~a) A custom subclass of EnumView or FlagView can be used for a given enum type if so desired, by using the view_class keyword parameter on enum creation. Reference-level explanation amaranth.lib.enum.EnumView is a ValueCastable subclass. The following operations are defined on it: EnumView(enum, value_castable): creates the view shape(): returns the underlying enum as_value(): returns the underlying value eq(value_castable): delegates to eq on the underlying value __eq__ and __ne__: if the other argument is an EnumView of the same enum type or a value of the enum type, delegates to the corresponding Value operator; otherwise, raises a TypeError All binary arithmetic, bitwise, and remaining comparison operators: raise a TypeError (to override the implementation provided by Value in case of an operation between EnumView and Value) amaranth.lib.enum.FlagView is a subclass of EnumView. The following additional operations are defined on it: __and__, __or__, __xor__: if the other argument is a FlagView of the same enum type or a value of the enum type, delegates to the corresponding Value operator and wraps the result in FlagView; otherwise, raises a TypeError __invert__: inverts all bits in this value corresponding to actually defined flags in the underlying enum type, then wraps the result in FlagView The behavior of EnumMeta.__call__ when called on a value-castable is changed as follows: If the enum has been created with a view_class, the value-castable is wrapped in the given class Otherwise, if the enum type is a subclass of IntEnum or IntFlag, the value-castable is returned as a plain Value Otherwise, if the enum type is a subclass of Flag, the value-castable is wrapped in FlagView Otherwise, the value-castable is wrapped in EnumView The behavior of EnumMeta.const is modified to go through the same logic. Drawbacks This proposal increases language complexity, and is not consistent with eg. how amaranth.lib.data.View operates (which has much more lax type checking). Rationale and alternatives Do nothing. Operations on mismatched types will continue to be silently allowed. Equality could work more like Python equality (always returning false for mismatched types). Assignment could be made strongly-typed as well (with corresponding hook added to Value). Prior art This feature directly parallels the differences between Python's Enum/Flag and IntEnum/IntFlag. Unresolved questions Instead of having an extension point via view_class, we could instead automatically forward all otherwise unknown methods to the underlying enum class, providing it the EnumView as self. Future possibilities None.","breadcrumbs":"0031-enumeration-type-safety","id":"17","title":"0031-enumeration-type-safety"},"18":{"body":"Start Date: 2023-12-04 RFC PR: amaranth-lang/rfcs#34 Amaranth Issue: amaranth-lang/amaranth#985 Rename amaranth.lib.wiring.Interface to PureInterface Summary The Interface class in amaranth.lib.wiring is renamed to PureInterface, to avoid the impression that it is used for all interfaces. Motivation The current naming of the Interface class wrongly suggests that it is the base class to be used for all interfaces, and that isinstance(foo, Interface) is a valid check for an interface. However, this is in stark contrast to how lib.wiring works: any object can be an interface, as long as it has a signature property and compliant members. This misleads users (and, on at least two occasions, amaranth developers), making them write buggy code. Additionally, the naming makes spoken language ambiguous in a bad way, as it is impossible to tell apart \"an interface\" and \"an Interface\". Therefore, this RFC proposes to rename Interface to something more specific and reflecting its function. Guide-level explanation The Interface class in amaranth.lib.wiring is renamed to PureInterface. Reference-level explanation The Interface class in amaranth.lib.wiring is renamed to PureInterface. Drawbacks Minor churn. Rationale and alternatives The new name is, of course, subject to bikeshedding. The names that have been proposed are: PureInterface BareInterface Prior art None. Unresolved questions None. Future possibilities The name Interface that has just been freed up can be reused for an ABC-like class representing all valid interfaces.","breadcrumbs":"0034-interface-rename","id":"18","title":"0034-interface-rename"},"19":{"body":"Start Date: 2023-12-04 RFC PR: amaranth-lang/rfcs#35 Amaranth Issue: amaranth-lang/amaranth#986 Add ShapeLike, ValueLike Summary Two special classes are added to the language: ShapeLike and ValueLike. They cannot be constructed, but can be used to determine with isinstance and issubclass to determine whether something can be cast to Shape or a Value, respectively. Motivation As it stands, we have multiple types of objects that can be used as shapes (Shape, ShapeCastable, int, range, EnumMeta) and values (Value, ValueCastable, int, Enum). These types have no common superclass, so there's no easy way to check if an object can be used as a shape or a value, save for actually calling Shape.cast or Value.cast. Introducing ShapeLike and ValueLike provides an idiomatic way to perform such a check. Additionally, when type annotations are in use, there is currently no simple type that can be used for an argument that takes an arbitrary shape- or value-castable object. These new classes provide such a simple type. Guide-level explanation In Amaranth, multiple types of objects can be cast to shapes: actual Shape objects ShapeCastable objects non-negative integers range objects Enum subclasses with const-castable values To check whether an object is of a type that can be cast to a shape, isinstance(obj, ShapeLike) can be used. To check whether a type can be, in general, cast to a shape, issubclass(cls, ShapeLike) can be used. Likewise, multiple types of objects can be cast to values: actual Value objects ValueCastable objects integers values of Enum subclasses with const-castable values To check whether an object is of a type that can be cast to a value, isinstance(obj, ValueLike) can be used. To check whether a type can be, in general, cast to a value, issubclass(cls, ValueLike) can be used. Reference-level explanation A ShapeLike class is provided. It cannot be constructed, and can only be used with isinstance and issubclass, which are overriden by a custom metaclass. issubclass(cls, ShapeLike) returns True for: Shape ShapeCastable and its subclasses int and its subclasses range and its subclasses enum.EnumMeta and its subclasses isinstance(obj, ShapeLike) returns True for: instances of Shape instances of ShapeCastable and its subclasses non-negative int values (and int subclasses) enum.Enum subclasses where every value is a ValueLike Similarly, a ValueLike class is provided. issubclass(cls, ValueLike) returns True for: Value and its subclasses ValueCastable and its subclasses int and its subclasses enum.Enum subclasses where every value is a ValueLike isinstance(obj, ValueLike) returns True iff issubclass(type(obj), ValueLike) returns True. Drawbacks More moving parts in the language. isinstance(obj, ShapeLike) does not actually guarantee that Shape.cast(obj) will succeed — the instance check looks only at surface-level information, and an exception can still be thrown. issubclass(cls, ShapeLike) is, by necessity, even more inaccurate. Rationale and alternatives There are many ways to implement the instance and subclass checks, some more precise (and complex) than others. The semantics described above are a compromise. For isinstance, a simple variant would be to just try Shape.cast or Value.cast and see if it raises an exception. However, this will sometimes result in isinstance(MyShapeCastable(), ShapeLike) returning False, which may be very unintuitive and hide bugs. The check for a valid shape-castable enum described above is an approximation — the actual logic used requires all values of an enum to be const -castable, not just value-castable. However, there is no way to check this without actually invoking Value.cast on the enum members. Prior art Python has the concept of abstract base classes, such as collections.abc.Sequence, which can be used for subclass checking even if they are not actual superclasses of the types involved. ShapeLike and ValueLike are effectively ABCs, though they do not use the actual ABC machinery (due to having custom logic in instance checking). Unresolved questions Should the exact details of the instance and subclass checks be changed? Future possibilities A similar ABC-like class has been proposed for lib.wiring interfaces.","breadcrumbs":"0035-shapelike-valuelike","id":"19","title":"0035-shapelike-valuelike"},"2":{"body":"Start Date: 2023-08-22 RFC PR: amaranth-lang/rfcs#2 Amaranth Issue: amaranth-lang/amaranth#872 Interface definition library RFC Summary Add standard ways of declaring that a component of a design conforms to a particular interface and connecting components with complementary interfaces together, to fill the other of the two major use cases of Record while avoiding its downsides. See also RFC #1 . Motivation Digital designs are composed of densely packed components that communicate with each other using well-defined interfaces. Mechanisms to denote the boundary of a component, to ensure that a component complies to a specified interface, and to make reliable connections between components are essential. Currently, Amaranth provides none of these mechanisms. A component implemented in Amaranth, however well-defined conceptually, has no more external structure than a loose collection of Signals assigned to its attributes; and whether any one of them is a part of the interface or the implementation is up to a guess. Even when an interface is described using amaranth.hdl.rec.Layout, such a description cannot be used to verify even the simplest aspects of compliance, such as presence of fields. Although building components by composing smaller components together is ubiquitous, amaranth.hdl.rec.Layout is not able to compose their interface with the same ease. Connecting components using amaranth.hdl.rec.Record.connect is difficult enough that it sees very little use. Originally, Record was aimed at solving many of these issues. However, it has multiple major drawbacks: Record attempts to do too much: it is both a mechanism for controlling representation (including implicitly casting a record to a value) and a mechanism for defining interfaces (specifying signal directions and facilitating connections between records). These mechanisms should be defined separately, since the only aspect they have in common is using a container class that consists of multiple named fields. Conflating the two mechanisms constraints the design space, making addressing the other drawbacks impossible, and the ill-defined scope encourages bugs in downstream code. Record's model of signal directions is too complex. Because it attempts to model both aggregates with controlled representation and interfaces with defined directionality, every signal can have one of the three directions, the third option being non-directed. While this can be applied in a robust way-- FIRRTL has only one aggregate type that it uses for both purposes--this gives rise to a large combination of features and requires handling many edge cases. Record's model of signal directions is too limited. The two static directionalities it has are the confusingly named \"fanout\" and \"fanin\", which really mean \"from initiator to target\" and \"from target to initiator\". This is insufficient to describe common, straightforward interactions such as two components exchanging streams of data across pairs of identical, complementary endpoints. Records are hard to customize. Records create and hold their signals, only providing the caller with an ability to place caller-created signals into individual fields. Signals often need adjustments: primarily setting a reset value or adding a decoder, but sometimes adding attributes or renaming. These adjustments must be performed at the record creation site, which is burdensome. Record fields can be (apart from sub-records) only plain signals. In many cases, an interface between components carries structured data rather than opaque bit vectors. It is not possible to define inner structure for record fields other than through a sub-record, and using a sub-record for this means that an application-specific endpoint that defines such structure cannot be connected to a generic endpoint that does not. Records are hard to compose. The natural way to define a record is to call the Record constructor with a layout, but this creates the entire layout hierarchy unless parts of it are replaced; and it requires having the layout of the result in advance. Record.connect determines the direction of data flow that it will create by the relative position of the interfaces being connected, with x.connect(y) and y.connect(x) having the oposite polarity of assignments. However, the direction of data flow is defined by the component that exposes the interface. Thus, every call of Record.connect can be done in one of the two very similar ways, one of which is always wrong. Record.connect uses wired-OR to gather the \"fanin\" signals, a feature that exists so that it could be used to connect e.g. Wishbone endpoints together without additional gateware. The assumption that the response signals of inactive endpoints will remain all-zero is, generally, unsound. Record.connect manages connections between interfaces with optional signals at the call site using an include/exclude mechanism. However, the semantics of the non-implemented optional signals are a property of the interface, not the connection. Record and rec.Layout are often used as base classes. The Record.like facility, frequently used because of the poor ergonomics of rec.Layout, loses this information and returns an instance of the base class; rec.Layout does the same when indexed. As a result, there is little value in defining methods and attributes on the subclass, and Record subclasses are little more than a callable computing a layout. Due to the limitations of Record, one might define a plain Python class that exposes compatible attributes. An instance of such a class cannot be compared to a known rec.Layout nor can it be embedded in another Record. Record is value-castable and implements the .eq() protocol. Although useful when all fields are non-directional, using .eq() instead of .connect() when connecting directional interfaces is, generally, unsound. It also reserves commonly used names such as any, all, and matches, and implements arithmetic operations that are rarely if ever used on field containers. rec.Layout's DSL is very amorphous. It passes around variable length tuples. The second element of these tuples (the shape) can be another rec.Layout, which is neither a shape nor a shape-castable object. Since these drawbacks are entrenched in the public API and make Record nearly useless for defining interfaces, a new mechanism must replace it. Outline of the design space Although some HDLs and IRs (Migen, Chisel, FIRRTL, ...) choose to use the same basic aggregate data type to represent structured data and directional interfaces , these mechanisms are in direct conflict. Complex forms of structured data, such as unions, are incompatible with associating directionality independently with every leaf member; and the non-directional nature of stored data requires complicated and error-prone rules when it can become a part of a directional connection. Amaranth, instead, opts to include two superficially similar mechanisms for defining and accessing hierarchical aggregate data: amaranth.lib.data (RFC #1) and amaranth.lib.wiring (this RFC). amaranth.lib.data provides data views that reinterpret bit containers as complex aggregates, and entirely avoids directionality. amaranth.lib.wiring provides signatures that give a concrete shape to signals at component boundaries, and always treats them as directional. When connections are made strictly between an output and a correspondingly named input, interfaces gain a dualistic nature: every connection is made between two interfaces whose port directions are the inverse of each other, and which are identical otherwise. To describe interfaces without repeating oneself, then, one has to pick an arbitrarily preferred directionality (and stick with it). Many interfaces are asymmetric, with data flowing from a source to a sink, or transactions issued from an initiator to a target. Amaranth picks the source or initiator perspective; an interface, examined in isolation, defines as outputs the signals that would be outputs of an initiator (and inputs of a target). Then, when an interface with true (non-flipped) directionality describes a component's output, the same interface with inverse (flipped) directionality symmetrically describes an input. To eliminate the major usability issues with Record.connect, the interface connection mechanism assigns no precedence to interfaces and has no effect on signal directionality; whether a signal is an input or an output depends only on the interface itself. A connection is only made from an output to a matching input, and any other combination is rejected with a diagnostic. This way, connecting a pair of interfaces always leads to the same outcome, regardless of their order. The choice to always treat interface signals as directional and to make their directionality dependent only on the interface itself leaves only one aspect of the design open: when and how interface directionality is flipped. The decisions that determine it affect both ergonomics and soundness. Record.connect in effect gives the programmer an option to flip directionality even when it would create an illegal connection. Conversely, rec.Layout provides no such affordance, even though it is necessary for composing components. To facilitate composing components, the interface's directionality is flipped when it is used as an input, whether a top-level input of a component, or as a constituent of a larger interface. This way, the existing mechanism of annotating the directionality of an interface signal or a module port transparently handles interface composition. Guide-level explanation Amaranth designs are made out of components (Python classes implementing Elaboratable) whose attributes include signals. These signals have directions: \"in\" signals are sampled by the component, while \"out\" signals are driven by it, or left at their reset value, and are provided to be sampled by other components. At the moment, these directions are completely informal, and described in the documentation and/or in the signal name as an i_ or o_ prefix (to make it clearer what the direction is at the point of use, or to disambiguate the ports that would otherwise have identical name): class SequenceSource(Elaboratable): \"\"\" Ports ----- data : Signal(width), out ready : Signal(1), in valid : Signal(1), out \"\"\" def __init__(self, width=16): self.data = Signal(width) self.ready = Signal() self.valid = Signal(reset=1) def elaborate(self, platform): m = Module() with m.If(self.ready): m.d.sync += self.data.eq(self.data + 1) return m The SequenceSource component is implemented as a simple counter producing values for an output stream that is connected to some other component consuming them. On each clock tick, if the consumer is ready , it samples the data (the counter value), and simultaneously with that, the producer advances the data to the next item (the incremented value). Since there is always a next item available and it is ready for consumption on the next clock cycle, the stream always contains valid results. Note It is not, in general, possible to infer the directions of the signals from the implementation—here, ready and valid have different directions and different intended uses, but they look similar to the Amaranth implementation since they are both undriven in the component. This RFC proposes a way of describing signal directions that can be applied to any Python object. In addition to elaboratables, it includes Python objects that are used to group together signals with a similar purpose, such as those that are parts of a bus. To describe signal directions, only a single addition is needed: the signature property: from amaranth.lib.wiring import Signature, In, Out class SequenceSource(Elaboratable): ... signature = Signature({ \"data\": Out(16), \"ready\": In(1), \"valid\": Out(1) }) Consider another component that is consuming these values: class NumberSink(Elaboratable): ... def elaborate(self): m = Module() processing = Signal() m.d.comb += self.ready.eq(~processing) with m.If(self.valid & ~processing): m.d.sync += processing.eq(1) with m.Elif(processing): ... # process it somehow signature = Signature({ \"data\": In(16), \"ready\": Out(1), \"valid\": In(1) }) Currently, the only way (given the tools provided by the language and the standard library) to connect the output stream of the SequenceSource to the input stream of the NumberSink is to do this signal-wise: m = Module()\nm.submodules.source = source = SequenceSource()\nm.submodules.sink = sink = NumberSink()\nm.d.comb += [ sink.data.eq(source.data), source.ready.eq(sink.ready), sink.valid.eq(source.valid)\n] This is tedious, verbose, and error-prone. It is possible to define an application-specific function abstracting this operation, and many applications do, but something this universal should be defined on the language level. This RFC introduces a way to describe interfaces (collections of directional signals; more on this later) and a single operation: connecting . The code above now transforms into: from amaranth.lib.wiring import connect m = Module()\nm.submodules.source = source = SequenceSource()\nm.submodules.sink = sink = NumberSink()\nconnect(m, sink, source) The order of arguments to connect does not matter as the directionality is defined by the components themselves. It could just as well be written as: connect(m, source, sink) However, this approach still has flaws. Most importantly, the signature for SequenceSource and NumberSink is written twice, but their signature is exactly the same except that the direction is flipped: In members become Out, and vice versa. To avoid error-prone repetition here, the signature can be defined once: Stream16BitSignature = Signature({ \"data\": Out(16), \"ready\": In(1), \"valid\": Out(1)\n}) and then used twice, for both the source and the sink: class SequenceSource(Elaboratable): ... signature = Stream16BitSignature class NumberSink(Elaboratable): ... signature = Stream16BitSignature.flip() The Signature.flip() method returns a flipped signature object : a signature object whose members have inverse direction but which is otherwise identical. Since this approach has reusable signatures defined with a specific direction, it is necessary to make an arbitrary choice: pick the kind of object whose signature will use the non-flipped directions. This RFC picks the object that is the source of data (for stream-like interfaces), the transaction initiator (for bus-like interfaces), and so on to use non-flipped directions by convention. Although some duplication was eliminated, some more remains: currently, it is necessary to define a stream signature for every kind of stream (a stream of 16-bit values, a stream of RGB colors, and so on). It is possible to define a reusable stream signature by inheriting from the Signature class: class StreamSignature(Signature): def __init__(self, payload_shape): super().__init__({ \"payload\": Out(payload_shape), \"ready\": In(1), \"valid\": Out(1) }) The elaboratables above can then be defined as: class SequenceSource(Elaboratable): ... signature = StreamSignature(16) class NumberSink(Elaboratable): ... signature = StreamSignature(16).flip() Usually, elaboratables have more than one interface. For example, a very simple DSP block could sink a stream of signed numbers, take their absolute value, and source a stream of unsigned numbers. It would then have a pair of ready, valid, and payload signals each: one for the input steam, and another for the output stream. To handle this case, signature's members can be signatures themselves. These members also have directionality; an Out signature leaves the directionality of its members unchanged, while an In signature flips it. The signature method of the processing block could be defined as: class AbsoluteProcessor(Elaboratable): ... signature = Signature({ \"i\": In(StreamSignature(signed(16))), \"o\": Out(StreamSignature(unsigned(16))) }) To be compliant with this signature, an AbsoluteProcessor instance must have an i attribute compliant with a StreamSignature(signed(16)).flip(), and an o attribute compliant with a StreamSignature(unsigned(16)). These could be defined manually: class AbsoluteProcessor(Elaboratable): def __init__(self): self.i = object() self.i.payload = Signal(signed(16)) self.i.ready = Signal() self.i.valid = Signal() self.i.signature = StreamSignature(signed(16)).flip() self.o = object() self.o.payload = Signal(unsigned(16)) self.o.ready = Signal() self.o.valid = Signal() self.o.signature = StreamSignature(unsigned(16)) ... Once more, to reduce error-prone repetition, the Signature class offers a way to define objects just like the ones created above, making the complete definition be: class AbsoluteProcessor(Elaboratable): def __init__(self): self.i = StreamSignature(signed(16)).flip().create() self.o = StreamSignature(unsigned(16)).create() signature = Signature({ \"i\": In(StreamSignature(signed(16))), \"o\": Out(StreamSignature(unsigned(16))) }) ... Signature subclasses can also override the create method to add functionality not present in the base class. For example, a signature for a bus such as Wishbone or AXI could return an instance of a class rather than a simple object(), and include attributes indicating which optional features of the bus are enabled. However, since the interface of AbsoluteProcessor as a whole can itself be described as a signature, it is possible to further shorten it by deriving from component.Component instead of Elaboratable, in which case the attributes will be filled in from the signature automatically: from amaranth.lib.wiring import Component class AbsoluteProcessor(Component): signature = Signature({ \"i\": In(StreamSignature(signed(16))), \"o\": Out(StreamSignature(unsigned(16))) }) def elaborate(self): m = Module() with m.If(self.i.payload > 0): m.d.comb += self.o.payload.eq(self.i.payload) with m.Else(): # Does not overflow, since -(-32768) [least signed(16)] is less # than 65536 [greatest unsigned(16)]. m.d.comb += self.o.payload.eq(-self.i.payload) return m Python variable annotations can also be used in cases like the above, where the signature is the same for every instance of the class (i.e. the component is not parameterized during creation): class AbsoluteProcessor(Component): i: In(StreamSignature(signed(16))) o: Out(StreamSignature(unsigned(16))) def elaborate(self): m = Module() with m.If(self.i.payload > 0): m.d.comb += self.o.payload.eq(self.i.payload) with m.Else(): # Does not overflow, since -(-32768) [least signed(16)] is less # than 65536 [greatest unsigned(16)]. m.d.comb += self.o.payload.eq(-self.i.payload) return m All of the import statements in the code examples above can be replaced with: from amaranth.lib.wiring import * Reference-level explanation This RFC proposes a number of library additions: Adding classes that describe a hierarchy of Amaranth objects (an elaboratable object and the objects containing its interface signals) and ease instantiating such hierarchies. Adding a function that connects such hierarchies to each other. It also introduces a number of technical terms: A component is an Amaranth elaboratable object. An interface (a concept) is a shared boundary across which several Amaranth components exchange data. It is comprised of a set of signals and the invairants that govern their use. An interface object (an implementation of the concept) a Python object that includes: attributes whose value is an Amaranth value-castable, or another interface; a signature attribute whose value is a signature that is compliant with this object; a description of the invariants applying to its use (in form of documentation, testbenches, formal tests, etc.). A signature is a Signature instance describing requirements applicable to a hierarchy of interace objects. A signature member is a Member instance describing requirements applicable to a single attribute of an interface object. Two kinds of signature members exist: port members (requiring the value of the attribute to be a Signal), and interface members (requiring the value of the attribute to be another interface object). An object is compliant with a signature (therefore making it an interface object) if every member of the signature corresponds to an attribute of the object whose value fits the requirements. A single elaboratable object will often have several interfaces; e.g. a peripheral can have a CSR and/or Wishbone bus interface, and a pin interface. However, the elaboratable object itself can be an interface object as well, which makes it easy to convert it to Verilog and use standalone since its signature defines the ports the Verilog module needs to have. Interface description Interfaces are described using an enumeration, amaranth.lib.wiring.Flow, and two classes, amaranth.lib.wiring.Member and amaranth.lib.wiring.Signature: Flow is an enumeration with two values, In and Out. Flow.__call__(arg, **kwargs) forwards to Member(self, arg, **kwargs). Thus, Out(unsigned(16), reset=0x1234) is a shorthand for Member(Flow.Out, unsigned(16), reset=0x1234). flow.flip() flips the value from In to Out and back. A Member(flow, ...) object describes a part of an interface. It is immutable. A Member(flow, shape_castable, reset=reset_value) object describes a port with the given shape and flow direction. The returned Member object has: the .flow property be flow; the .is_port property be True; the .is_signature property be False; the .shape property be shape_castable; the .reset property be reset_value; the .signature property raise TypeError; the .dimensions property be (). A Member(flow, signature) object describes a constituent interface with the given flow direction. If flow is Flow.In, then the actual flow of every port recursively described by signature is the reverse of the stated direction. The returned Member object has: the .flow property be flow; the .is_port property be False; the .is_signature property be True; the .shape property raise TypeError; the .reset property raise TypeError; the .signature property return signature if flow is Out, signature.flip() if flow is In. the .dimensions property be (). member.array(*dimensions) returns a new Member object whose .dimensions property is dimensions, which is any amount of non-negative numbers, and all other properties are the same as those of member. Calling .array() on a member with dimensions prepends the new dimensions before the old ones, for composability. member.flip() returns a new Member object whose .flow property is ~member.flow, and all other properties are the same as those of member. A Signature(...) object describes an interface comprised of named members: ports and nested interfaces (which themselves are described using signature objects). The Signature class can be derived from. Instances of Signature itself are termed anonymous signatures , and instances of derived classes are named signatures . A Signature({\"name\": Member(...)}) object can be constructed from a name to member mapping. signature.members is a mutable mapping that can be used to alter the description of a non-frozen signature. signature.members += {...} adds members from the given mapping to signature.members if the names being added are not already used. Raises NameError otherwise. signature.freeze() (or signature.members.freeze()) prevents any further modifications of signature (and in particular signature.members), enabling the caller to rely on a particular layout. It is applied recursively to constituent interfaces. It returns self to aid assignments in class definition like: class X: signature = Signature({ ... }).freeze() signature.flip() returns a signature where every member is member.flip()ped. The exact object returned is a proxy object that overrides the methods and attributes defined here such that the flow is flipped, and otherwise forwards attribute accesses untouched. That is, signature.x = and signature.flip().x = both define an attribute on the original signature object, and never on the proxy object alone. When calling method signature.f as signature.flip().f, self is the flipped signature. signature.flatten(object) returns an iterator yielding a path, member, value tuples for each of the ports recursively contained in the signature, where: path is a tuple of strings or integers indicating the sequence of attribute or index accesses that were used to retrieve value from object member is the port member corresponding to value, with the flow flipped as appropriate value is a value-castable object corresponding to the port (usually but not always a Signal) signature.is_compliant(object) checks whether an arbitrary Python object is compliant with this signature. To be compliant with a signature: for every member of the signature, the object must have a corresponding attribute if the member is a port, the attribute value must be a value-castable such that Value.cast(object.attr) method returns a Signal or a Const that has the same width and signedness, and for signals, is not reset-less and has the same reset value as the member a warning may be emitted if the .shape of the member and the .shape() of object.attr are not equal if the member is an interface, the attribute value must be compliant with the signature of the member if the member's dimensions are (p, q, ...), the requirements below hold instead for every result of indexing the attribute value with [i][j]... where i in range(p), j in range(q), ... signature.members.create() creates a dictionary of members from it. This is a helper method for the common part of signature.create(). For every member of the signature, the dictionary contains a value equal to: If the member is a port, Signal(member.shape, reset=member.reset). If the member is a signature, member.signature.create() for Out members, and member.signature.flip().create() for In members. signature.create() creates an interface object from this signature. To do this, it calls the constructor of Interface described below. This method is expected to be routinely overridden in Signature subclasses to instantiate subclasses of Interface. All of the methods that can be called on signature can be called on the object returned by signature.flip(), and self in that case is signature.flip(). This means that in a method defined on a subclass of Signature, self can be an instance of that type, or an instance of a different type, FlippedSignature, which implements the flipping behavior. In the rare case where it is useful to determine which one it is, it is possible to use type(self) is amaranth.lib.wiring.FlippedSignature. Any object can be an interface object if it has the appropriate signature property. However, an amaranth.lib.wiring.Interface class is introduced, serving two purposes: instantiating interfaces from an anonymous signature, and serving as a convenient base class for custom interface classes. The Interface class implements only the __init__() method, accepting a signature as a parameter. It assigns self.signature to be that signature, and for each item in signature.members.create() it creates a corresponding attribute on self. Interface connection Interface objects may be connected to each other using the amaranth.lib.wiring.connect(m, *objects) free function. This function connects interface objects that satisfy the following requirements: The set of members (considered by their paths) is exactly the same for each of the objects. For each given path, all members are either signature members or port members. For each given path where all members are port members, the width of every member with the same path is equal, though the exact types of the objects returned by the .shape property may differ. For each given path where all members are port members, the reset values of all members with the same path must match. For each given path where all members are port members, exactly one member has an Out flow. If the In port member is a signal, it is connected to the Out port member with the same path as follows: m.d.comb += input_port.eq(output_port) If the In port member is a constant, no connection is actually made. The Out port member with the same path (if any) must be a constant with the same value. Forwarding interfaces In some cases, an outer elaboratable object creates an inner elaboratable object and exposes an interface of the inner object as its own: class Outer(Component): bus: Out(BusSignature()) def __init__(self): super().__init__() self.inner = Inner() def elaborate(self, platform): m = Module() m.d.comb += [ self.inner.bus.addr.eq(self.bus.addr), self.inner.bus.w_data.eq(self.bus.w_data), self.bus.r_data.eq(self.inner.bus.r_data), # ... ] return m class Inner(Component): bus: Out(BusSignature()) ... In this case, amaranth.lib.wiring.connect(...) won't help, since an output needs to be connected to an output, and an input to an input. An additional function amaranth.lib.wiring.flipped(obj) is added to assist in this case. It returns a proxy object obj_flipped where obj_flipped.signature equals obj.signature.flip(), and everything else is forwarded identically otherwise. So, the Outer.elaborate method can be rewritten as: class Outer(Component): bus: Out(BusSignature()) def __init__(self): super().__init__() self.inner = Inner() def elaborate(self, platform): m = Module() connect(m, flipped(self.bus), self.inner.bus) return m Component definition This RFC in effect introduces a particular kind of elaboratable object: one that has a signature. While connecting an elaboratable as a whole (as opposed to its sub-interfaces) will rarely, if ever, happen, it is still convenient to have an elaboratable define its signature, for three reasons: It is a declaration of intent, separating the signals that are purposefully a part of its interface from ones that just happen to be assigned to attributes, and stating their direction; It simplifies and standardizes assignment of the interface attributes, making the signature property the single source of truth for the module's interface; It makes it easy to convert a single standalone elaboratable to Verilog. To this end, a class amaranth.lib.wiring.Component is introduced: Component.__init__ (typically called as super().__init__()) updates self.__dict__ with the result of self.signature.members.create(). (If there is a name conflict, it raises an error.) Component.signature collects PEP 526 variable annotations in the class's method resolution order chain up to Component, if any, and returns a signature object constructed from these, or raises an error otherwise. The signature object is created per-instance, not per-class, so that it can be safely mutated if this is a part of the workflow. Alternatives and rationale Do nothing. Record will continue to be used alongside the continued proliferation of ad-hoc implementations of similar functionality, and continue to impair the use of Amaranth components together. Replace the amaranth.lib.wiring.connect free function with a function amaranth.hdl.dsl.Module.connect. It is not a function on amaranth.hdl.dsl.Module to avoid privileging the standard interface library over any other library that may be written downstream. At the moment nothing in amaranth.lib is special in any way other than its name, and preserving this is valuable to the author. Naming questions Should amaranth.lib.wiring be called something else, like amaranth.lib.bus or amaranth.lib.component? bus is short, but not every interface is a bus interface; component (or module, really) puts too much emphasis on the things being interfaced, rather than the interfaces (@jfng) i wouldn't want the bus keyword to already be taken in my namespaces (@jfng) I guess my point is mostly that bus is not the opposite of data, but wiring is (@whitequark) I don't like how long \"component\" is (@whitequark) Should Signature.compatible be named something else, like Signature.is_implemented_by, Signature.is_compliant, Signature.complies_with? Signature.compatible misses an is_ and does not look like a query method (@jfng) I mean, \"compatible\" could mean that two signatures could be connected together. when checking if an object is compliant to a signature, directions also matters (@zyp) Signature.complies_with reverses subject and object (@zyp) Signature.is_implemented_by is verbose (@jfng) Should amaranth.lib.wiring.forward be named something else, like amaranth.lib.wiring.forwarded or amaranth.lib.wiring.forwarding or amaranth.lib.wiring.flip or amaranth.lib.wiring.transpose or ``amaranth.lib.wiring.transposeoramaranth.lib.wiring.inner`? having two essentially unrelated operations called flip when one is already confusing is too much (@whitequark) reflective programming is a thing (@zyp) inner(inner(interface)) to flip it back to the original wouldn't make much sense (@zyp) Future work One-to-many connections between interfaces are currently provided only with a fan-out topology: a single interface with output members only can be connected with multiple interfaces with input members only. This avoids the question of what to do with an input that must be driven by multiple outputs. The interface library could be enriched by adding a small amount of fixed fan-in topologies, e.g. wired-OR and wired-AND, specified as a Member() constructor parameter that must match between all of the respective members.","breadcrumbs":"0002-interfaces","id":"2","title":"0002-interfaces"},"3":{"body":"Start Date: 2023-02-27 RFC PR: amaranth-lang/rfcs#3 Amaranth Issue: amaranth-lang/amaranth#756 Enumeration shapes Amendments The behavior described in this RFC was updated by RFC #4 . Summary Allow explicitly specifying shape for enumerations as an alternative to implicitly inferring it. Motivation Hardware development includes a lot of enumerated values, so first class support for enumerations is important, and so is integration with the standard Python mechanisms for specifying enumerations. Amaranth accepts enum.Enum subclasses anywhere a shape is expected, and enum.Enum instances anywhere a value is expected: >>> from amaranth import *\n>>> from enum import Enum\n>>> class Kind(Enum):\n... MUL = 0\n... ADD = 1\n... SUB = 2\n...\n>>> Shape.cast(Kind)\nunsigned(2)\n>>> Value.cast(Kind.SUB)\n(const 2'd2) However, this does not cover an important use case: a enumeration where many values are reserved. For example, if the Kind enumeration above may need to be extended in the future, it would be necessary to reserve space for additional values, which may require additional storage bits. Right now there is no way to specify that Kind should be cast to e.g. unsigned(4). Guide-level explanation The Amaranth standard library module, amaranth.lib.enum can be used as a drop-in replacement for the Python standard library enum module. It exports the same classes as the ones provided by Python's enum (namely Enum, Flag, IntEnum, and IntFlag) and provides the same functionality, adding the possibility of specifying a shape for the enumeration when it is defined: >>> from amaranth.lib.enum import Enum\n>>> class Kind(Enum, shape=unsigned(4)):\n... MUL = 0\n... ADD = 1\n... SUB = 2\n...\n>>> Shape.cast(Kind)\nunsigned(4)\n>>> Value.cast(Kind.SUB)\n(const 4'd2) If the shape= keyword argument is not specified, the enumeration is treated exactly the same as the corresponding standard Python class. If the values specified for the members are not representable with the explicitly provided shape, a warning is emitted: >>> class Funct3(Enum, shape=unsigned(3)):\n... SUB = 8\n...\n:1: RuntimeWarning: Value of enumeration member will be truncated to enumeration shape unsigned(3)\n>>> class Funct3(Enum, shape=unsigned(3)):\n... SUB = -1\n...\n:1: RuntimeWarning: Value of enumeration member is signed, but enumeration shape is unsigned(3) A shape that is specified for a base class will be inherited in subclasses: >>> class Enum3(Enum, shape=unsigned(3)): pass\n...\n>>> class Funct3(Enum3):\n... SUB = 2\n...\n>>> Shape.cast(Funct3)\nunsigned(3) If a enumeration without an explicitly defined shape is used in a concatenation, a warning is emitted: >>> class Kind(Enum):\n... ADD = 1\n...\n>>> Cat(Kind.ADD)\n:1: SyntaxWarning: Argument #1 of Cat() is an enumeration Kind.ADD without a defined shape used in bit vector context; define the enumeration by inheriting from the class in amaranth.lib.enum and specifying the 'shape=' keyword argument\n(cat (const 1'd1)) Reference-level explanation The Amaranth standard library module, amaranth.lib.enum, exports all of the public names of the Python standard library enum module. The EnumMeta class adds the functionality for storing and casting to shapes, and inherits from ShapeCastable. The Enum, Flag, IntEnum, and IntFlag classes in this module derive from enum.Enum, enum.Flag, enum.IntEnum, and enum.IntFlag respectively, and use amaranth.lib.enum.EnumMeta as their metaclass, which makes subclasses of amaranth.lib.enum.Enum, etc be instances of ShapeCastable. When a new amaranth.lib.enum.Enum subclass is defined, amaranth.lib.enum.EnumMeta.__new__ checks that the enumeration members are valid (currently, Amaranth requires these to be integers), and if the shape= argument is provided, stores it in an internal attribute. Importantly, the attribute is only set if the argument is provided, making it possible to distinguish these cases later. It also checks that all of the members can be represented by the given shape. When an amaranth.lib.enum.Enum subclass is cast to a shape, if the internal attribute is set, the shape in it is returned. Otherwise it is cast to a shape using exactly the same logic as what Shape.cast uses for enum.Enum subclasses. When an instance of a enum.Enum subclass is used in a concatenation, and it is not an instance of ShapeCastable, or if it lacks the _amaranth_shape_ attribute, a warning is emitted. This approach avoids a circular dependency between amaranth.hdl.ast and amaranth.lib.enum. Drawbacks Introducing a new standard library module increases the API surface. The names of enumeration base classes are the same as the standard library enumeration base classes, which may be confusing. Deriving from a different class requires changes to the enumeration at its point of definition, meaning that it is not possible to annotate a enum that comes from an external library with an Amaranth shape. Rationale and alternatives Ultimately, this feature boils down to defining an internal variable on an enum, which is then used by Shape.cast and other core Amaranth code. There are a few possible options for doing this. Special class variable: class SomeEnum(enum.Enum): _amaranth_shape_ = unsigned(4) Class decorator: @amaranth.shape(unsigned(4))\nclass SomeEnum(enum.Enum): Class keyword argument (this proposal): class SomeEnum(amaranth.lib.enum.Enum, shape=unsigned(4)): Alternative (1) has the following drawbacks: It is not possible to check that the enumeration members can be represented by the specified shape at the point of definition. It exposes what should be an implementation detail to the user. The documentation for the standard enum module does not specify whether it's OK to use _sunder_ names for one's own purposes, but it would have to be a part of the stable API. Its advantages are: No additional methods or classes in the API surface. _amaranth_shape_ makes it immediately clear what's going on. The variable can be defined on any enum, even an external one. Alternative (2) has the following drawbacks: It's not clear where the shape decorator should be. It can only be applied to enums, but there's no enum-specific namespace in Amaranth core to put it into. SomeEnum would inherit from the standard Enum class and therefore isinstance(SomeEnum, ShapeCastable) would be False unless ShapeCastable.__instancecheck__ is overridden to fix that. Its advantages are: The decorator can be applied to an external enum. Alternative (3) has the drawbacks specified above, and the following advantages: isinstance(SomeEnum, ShapeCastable) naturally works. As a consequence, no additional code is required in the core language. All of the functionality necessary for the feature to work lives in amaranth.lib.enum. The shape argument matches Signal(shape=) (even though no one uses the keyword form) and works the way one would naturally expect. Uses of import enum can be transparently replaced with from amaranth.lib import enum without updating the call sites, making the migration as easy as the other alternatives. Prior art None. Unresolved questions None. Future possibilities None.","breadcrumbs":"0003-enumeration-shapes","id":"3","title":"0003-enumeration-shapes"},"4":{"body":"Start Date: 2023-02-07 RFC PR: amaranth-lang/rfcs#4 Amaranth Issue: amaranth-lang/amaranth#755 Const-castable expressions Summary Define a subset of expressions that are \"const-castable\" and accept them in contexts where currently only integers and enumerations with integer values are accepted. Motivation In certain contexts, Amaranth requires a constant to be used. These contexts are: with m.Case(...):, Value.matches(...), and the value of an enumeration member that is being cast to a value. Currently, only integers and enumeration members with integer values are considered constants. However, this is too limiting. For example, when developing a CPU, one might want to define control signals for several functional units and combine them into instructions, or conversely, match an instruction against a combination of control signals: class Func(Enum): ADD = 0 SUB = 1 class Src(Enum): MEM = 0 REG = 1 class Instr(Enum): ADD = Cat(Func.ADD, Src.MEM) ADDI = Cat(Func.ADD, Src.REG) ... with m.Switch(instr): with m.Case(Cat(Func.ADD, Src.MEM)): ... Currently, all of these cases would produce syntax errors. There is a private Value._as_const method. It is not used internally, however Amaranth developers have started using it due to unmet needs. Removing it without providing a replacement would be disruptive, and will result in downstream codebases defining their own equivalent. Guide-level explanation In any context where a constant is accepted (with m.Case(...):, Value.matches(...), and the value of an enumeration member), a \"const-castable\" expression can be used. The following expressions are const-castable: int; Const; Cat where all operands are const-castable; instance of a Enum subclass where the value is const-castable. A const-castable expression can be converted to a Const using Const.cast: >>> Const.cast(1)\n(const 1'd1)\n>>> Const.cast(Cat(1, 0, 1))\n(const 3'd5)\n>>> Const.cast(Cat(Func.ADD, Src.REG))\n(const 2'd2) Reference-level explanation The Const.cast static method casts its argument to a value and examines it. If it is a Const, it is returned. If it is a const-castable expression, the operands are recursively cast to constants, and the expression is evaluated. The list of const-castable expressions is: Cat The m.Case(...) (through the Switch() constructor) and Value.matches(...) methods accept two kinds of operands: const-castable expressions, or a string containing a bit pattern (a sequence of 0, 1, or - meaning a wildcard). The Shape.cast method accepts enumerations where all members have const-castable expressions as their values. The shape of an enumeration is a shape with the smallest width that can represent the value of any enumeration member. RFC 3 : The EnumMeta.__new__ method accepts enumerations where all members have const-castable expressions as their values. The value of each member is the value of the constant resulting from casting the user-provided expression. Drawbacks A new language-level concept makes it harder to learn the language. Most developers already have an intuitive understanding of which expressions are const-castable. Const.cast shadows an existing Value.cast method since Const inherits from Value. No one is calling Value.cast through the Const.cast binding. Const.cast has a compatible interface (it returns a Value) and performs a similar function (it calls Value.cast first). However, it's not Liskov-compatible. Rationale and alternatives Alternatives: Do not add this functionality. Developers will define their own const-casting functions, continue to rely on the undocumented and private ._as_const() method, or use other workarounds. Make ._as_const() public (i.e. rename it to .as_const()). Add a new Const.cast method (this option). Alternatives (2) and (3) both introduce a new language-level concept, the only difference is in the interface that is used to access it. Alternative (3) fits the language better: Value.cast takes something value-castable and returns a Value, Shape.cast takes something shape-castable and returns a Shape, so Const.cast is a logical addition in that it takes something const-castable and returns a Const. Prior art Rust and C++ provide functionality (const fn and constexpr respectively) for performing computation at compile time, restricted to a strict subset of the full language. In particular, it can be used to initialize constants, which makes it similar to the functionality proposed here. One challenge these languages face is the question of how large the subset should be. Rust in particular started off heavily restricting const fn, where it did not have any control flow. The functionality was gradually introduced later as needed. Unresolved questions None. Future possibilities Expanding the set of const-castable expressions to include arbitrary arithmetic operations. This RFC limits it to the most requested expression, Cat. This simplifies implementation and reduces the likelihood of introducing bugs in the constant evaluation code, most of which would be almost never used.","breadcrumbs":"0004-const-castable-exprs","id":"4","title":"0004-const-castable-exprs"},"5":{"body":"Start Date: 2023-02-07 RFC PR: amaranth-lang/rfcs#5 Amaranth Issue: amaranth-lang/amaranth#754 Remove Const.normalize Summary Remove Const.normalize(value, shape). Motivation From the name it is not clear what it is supposed to achieve (it's truncation and inversion according to the shape) and it does not check types of arguments. We already have Const(value, shape).value and most developers should be aware of it. Having Const.normalize(value, shape) as well provides no benefit over the former. It's also longer. Explanation The Const.normalize method is deprecated (with the suggestion to use Const().value) and removed. Drawbacks Churn. Rationale and alternatives We could keep it. Removing it reduces the API surface and makes the language a bit more elegant. Prior art None. Unresolved questions None. Future possibilities None.","breadcrumbs":"0005-remove-const-normalize","id":"5","title":"0005-remove-const-normalize"},"6":{"body":"Start Date: 2023-05-31 RFC PR: amaranth-lang/rfcs#0006 Amaranth Issue: amaranth-lang/amaranth#681 CRC generator Summary Add a cyclic redundancy check (CRC) generator to the Amaranth standard library. Motivation Computing CRCs is a common requirement in hardware designs as they are used by a range of communication and storage protocols to detect errors and thereby ensure data integrity. Because of the standard structure and typical set of variations used by CRCs, it is readily possible to provide a general-purpose CRC generator in the standard library which should cover the majority of use cases efficiently. See the Wikipedia page on CRCs for more background and use cases. Guide-level explanation The Amaranth standard library includes a generator for a cyclic redundancy check (CRC) module, which can be used to compute and/or validate most common CRCs used by transmission and storage protocols. There are many different CRC algorithms in use, but they can almost all be described by the following parameters: The bit width of the CRC, commonly (but not always) a power of 2, The generator polynomial, represented as an integer where each bit is a 0 or 1 term in a binary-valued polynomial with as many terms as the CRC width, The initial value of the CRC register, commonly non-zero to allow detection of additional 0-valued data words at the start of a message, Whether to process input words least- or most-significant-bit first, allowing the CRC processing order to match the transmission or storage order of the data bits, Whether to flip the final output so that its least-significant-bit becomes the most-significant bit, set for the same reason as reflecting the input when the CRC value will also be transmitted or stored with a certain bit order, What value, if any, to XOR the output bits with before using the CRC value, often used to invert all bits of the output. This set of parameters is commonly known as the Williams or Rocksoft model. For more information, refer to \"A Painless Guide to CRC Error Detection Algorithms\" . For a list of parameters to use for standard CRCs, refer to: reveng 's catalogue, which uses the same parameterisation crcmod 's predefined list, but remove the leading 1 from the polynomials, XOR the \"Init-value\" with \"XOR-out\" to obtain initial_crc, and where Reversed is True, set both ref_in and ref_out to True. CRC Zoo , which only lists polynomials; use the \"explicit +1\" form but remove the leading 1. The CRC algorithms described in the reveng catalogue are also available in the Amaranth standard library in the crc.catalog module. In Amaranth, the crc.Algorithm class holds the parameters that describe a CRC algorithm: crc_width: the bit width of the CRC polynomial: the generator polynomial of the CRC, excluding an implicit leading 1 for the \"x^n\" term initial_crc: the initial value of the CRC, loaded when computation of a new CRC begins reflect_input: if True, input words are bit-reversed so that the least significant bit is processed first reflect_output: if True, the final output is bit-reversed so that its least-significant bit becomes the most-significant bit of output xor_output: a value to XOR the output with The crc.Algorithm class may be constructed manually, but for many commonly used CRC algorithms a predefined instance is available in the crc.catalog module. To fully define a CRC computation, the width of input data words to the CRC must also be specified. This is commonly 8 for processing byte-wise data, but can be any length greater than 0. The combination of a crc.Algorithm and the data_width makes a crc.Parameters instance, for example: from amaranth.lib import crc\nalgo = crc.Algorithm(crc_width=8, polynomial=0x2f, initial_crc=0xff, reflect_input=False, reflect_output=False, xor_output=0xff)\nparams1 = algo(data_width=8)\nparams2 = crc.catalog.CRC8_AUTOSAR(data_width=8) If not specified, the data width defaults to 8 bits. The crc.Parameters class can be used to compute CRCs in software with its compute() method, which is passed an iterable of integer data words and returns the resulting CRC value. from amaranth.lib import crc\nparams = crc.catalog.CRC8_AUTOSAR()\nassert params.compute(b\"123456789\") == 0xdf To generate a hardware CRC module, either call create() on crc.Parameters or manually construct a crc.Processor: from amaranth.lib import crc\nalgo = crc.Algorithm(crc_width=8, polynomial=0x2f, initial_crc=0xff, reflect_input=False, reflect_output=False, xor_output=0xff)\nparams = algo(data_width=8)\ncrc1 = m.submodules.crc1 = crc.Processor(params)\ncrc2 = m.submodules.crc2 = crc.Catalog.CRC8_AUTOSAR().create() The crc.Processor module begins computation of a new CRC whenever its start input is asserted. Input on data is processed whenever valid is asserted, which may occur in the same clock cycle as start. The updated CRC value is available on the crc output on the clock cycle after valid. With the data width set to 1, a traditional bit-serial CRC is implemented for the given polynomial in a Galois-type shift register. For larger values of data width, a similar architecture computes every new bit of the CRC in parallel. The match_detected output signal may be used to validate data that contains a trailing CRC. If the most recently processed word(s) form a valid CRC for all the data processed since start, the CRC register will always contain a fixed value which can be computed in advance, and the match_detected output indicates whether the CRC register currently contains this value. Reference-level explanation The proposed new interface is: A crc.Algorithm class which holds the parameters for a CRC algorithm, all of which are passed to the constructor: crc_width: bit width of the CRC register polynomial: generator polynomial for CRC algorithm initial_crc: initial value of CRC at start of computation reflect_input: if True, input words are bit-reversed reflect_output: if True, output values are bit-reversed xor_output: value to XOR the CRC value with at output crc.Algorithm implements __call__(data_width=) which is used to create a crc.Parameters instance with the specified data width. A crc.Parameters class which is constructed using a crc.Algorithm and a data_width. crc.Parameters has the following methods: compute(data) performs a software CRC computation on data, an iterable of input data words, and returns the CRC value create() returns a crc.Processor instance preconfigured to use these parameters residue() returns the residue value for these parameters, which is the value left in the CRC register after processing an entire valid codeword (data followed by its own valid CRC) algorithm() returns an crc.Algorithm with the same settings as this crc.Parameters instance A crc.Processor class which inherits from Elaboratable and implements the hardware generator A crc.catalog module which contains instances of crc.Algorithm The hardware implementation uses the property that CRCs are linear, and so the new value of any bit of the CRC register can be found as a linear combination of the current state and all the input bits. By expressing the CRC computation as a linear system like this, we can then determine the boolean equation used to update each bit of the CRC in parallel. A software CRC calculator is implemented in Python in order to find these logic equations. The proposed CRC generator is already implemented and available in PR 681 . The docstrings and comments in it should explain its operation to a suitably technical level of detail. Drawbacks Users could always write their own CRC or use an external library; Amaranth does not need to provide one for them. However, since it's a very common requirement that we can satisfy efficiently for a lot of users, it seems reasonable to include in the standard library. Rationale and alternatives As far as I'm aware, the method here is the optimal technique for generating the logic equations required for this combinatorial CRC generation. One alternative to the combinatorial logic equations is to store intermediate values in a lookup table; the table needs to contain a CRC-sized value for every possible input value, and then the computation required is reduced to a table lookup, an XOR, and some bit shifts. For single-byte words this approach may be practical, but it is unlikely to be worthwhile with 16- or 32-bit words. Additionally, the table approach generally requires a latency of 2 cycles (one extra to perform the table lookup). It's possible this would give better timing in some circumstances, but at the cost of block RAM resources and latency. Prior art The specification chosen for the CRC parameters is a popular de-facto standard, and importantly the reveng catalogue lists suitable parameters for a wide range of standard CRCs. This particular implementation was written in 2020 and is extracted (with permission) from a proprietary codebase, where it is used to generate a variety of CRCs on FPGAs. One early public example of using Amaranth to generate CRCs is from Harmon Instruments , also in 2020, which has a similar construction but does not support the full set of CRC parameters. In general, I found many examples of implementations of specific CRCs in other HDLs, but few for generic generators. There are many software libraries for generating CRCs in most programming languages, but as they are not generating hardware their implementation details are not as relevant - small table lookups are popular as the tradeoffs there tend to favour word-at-a-time computations. Unresolved questions No outstanding unresolved questions. Future possibilities The data interface uses start, data, and valid signals. Eventually, this could be replaced with a Stream, once they are finalised. Currently the entire input data word must be valid together; there is no support for masking some bits off. In particular, such a feature could be useful for wide data paths where the underlying CRC computation is byte-wise, for example a 128-bit-wide data stream from a 10GbE MAC where the Ethernet FCS must be computed over individual bytes. However, the implementation complexity is high, the use cases seem more niche, and such a feature could be added in a backwards-compatible later revision. The software CRC computation only supports computing over an entire set of data. It would be possible to offer an API to permit incremental updates and finalisation.","breadcrumbs":"0006-stdlib-crc","id":"6","title":"0006-stdlib-crc"},"7":{"body":"Start Date: 2023-05-11 RFC PR: amaranth-lang/rfcs#8 Amaranth Issue: amaranth-lang/amaranth#772 Aggregate data structure extensibility Summary Provide well-defined extension points for the aggregate data structure library. Motivation RFC 1 introduces the aggregate data structure library, which allows using any shape-castable object as the shape of a field. Layouts do not consider the specific type of the shape-castable object. However, views do, and depending on whether it's a layout, a subclass of an aggregate class (Struct or Union), or any other shape-castable object, behavior differs: >>> from amaranth import *\n>>> from amaranth.lib.data import *\n>>> class S(Struct):\n... x: unsigned(1)\n...\n>>> layout = StructLayout({\n... \"a\": unsigned(1),\n... \"b\": ArrayLayout(unsigned(2), 4),\n... \"c\": S\n... })\n...\n>>> View(layout).a\n(slice (sig $signal) 0:1)\n>>> View(layout).b\n\n>>> View(layout).c\n<__main__.S object at 0x7f53e4693a30> At the moment this behavior is not well-defined and it special-cases the aggregate classes defined in amaranth.lib.data. Guide-level explanation Any shape-castable object can be used as the shape of a field in a layout. This includes another layout. If the object is a callable (provides a __call__ method), then when a view is accessed, the __call__ method will be called with a single argument, the slice of the underlying value, which will be returned by the view. A Layout is a callable that constructs a View from itself and the value. Reference-level explanation The Layout class has a method __call__. layout(value) is equivalent to View(layout, value). The View.__getitem__ method (and by extension View.__getattr__), after extracting a field from the layout, attempts to call field.shape.__call__(value_slice), where value_slice is the slice of the underlying value corresponding to the field. If there is no such method, it iteratively calls as_shape() on field.shape or the result of the previous call to as_shape() until an object is returned that has a __call__ method, or until an instance of Shape is returned. Drawbacks The syntax may be confusing. Using __call__ to implement construction is a widespread pattern in Python. Moreover, Struct and Union are classes, whose __call__ method forwards to __new__, so implementing this behavior would remove the special case for aggregate base classes without additional code. Rationale and alternatives This design is, as far as the author knows, the smallest possible addition that provides the largest possible extensibility and removes all special casing of aggregate base classes. That it requires no additional functionality to be implemented on the aggregate base classes indicates that it fits well into the existing design. Alternatives: Do not do this. Prior art None. Unresolved questions None. Future possibilities None.","breadcrumbs":"0008-aggregate-extensibility","id":"7","title":"0008-aggregate-extensibility"},"8":{"body":"Start Date: 2023-05-11 RFC PR: amaranth-lang/rfcs#9 Amaranth Issue: amaranth-lang/amaranth#771 Constant initialization for shape-castable objects Summary Add an extension point to shape-castable objects, for converting constant initializers (typically Python literals) to Amaranth constant expressions. Motivation RFC 1 specifies that the reset= argument of a View accepts structured data: flt_neg_reset = data.View(float32_layout, reset={\"sign\": 1}) This structured data is internally turned into an integer constant that is supplied to Signal(reset=). This mechanism is not exposed to Amaranth developers. However, this creates a clear unmet need, since at the moment there is no way to turn a layout and a field-to-value mapping into a constant integer for use elsewhere. For example, if a signal is created manually and not through the View, this will not work despite looking reasonable (the layout is shape-castable and can be supplied to Signal): flt_neg_reset_signal = Signal(float32_layout, reset={\"sign\": 1}) Guide-level explanation Shape-castable objects must, in addition to the mandatory .as_shape() method, implement a mandatory .const(value) method to define how a constant initializer (the reset value of a Signal or View) is converted to an Amaranth constant. This method is defined by shape-castable objects to convert arbitrary Python objects into Amaranth constants. For example, if a shape-castable object has complex internal structure, it can accept a dictionary with the values to be filled into various bits of this structure. If Shape implemented ShapeCastable, the method would be defined as def const(self, value): return Const(value, self). The value returned by this method can be a Const or a value-castable object whose .as_value() will return a Const. This method can also be directly called by the developer to construct a constant using a given shape-castable object. Reference-level explanation A method def const(self, obj): is added on ShapeCastable. The Signal(shape, reset=) constructor is changed so that if isinstance(shape, ShapeCastable), then shape.const(reset) is used instead of reset. The .const() instance method is implemented on Layout to accept a Sequence or Mapping instance and returns a View over a Const with a bit pattern that has the fields set to the given values. Overlapping fields are written in the order of iteration of the input. If the field shape is a shape-castable object, then the value for that field is computed using Const.cast(value, field.shape). The .const() method is implemented on the metaclass of Struct and Union as return View(self, self.as_shape().const(obj)). The View(..., reset=) constructor is changed to pass reset through to the Signal() constructor. Drawbacks Additional method on ShapeCastable. It was clear from the beginning that this functionality will likely be necessary, and we are unlikely to ever add more. The reset= argument becomes dependently typed. Rationale and alternatives Given: class Point(Struct): x: 16 y: 16 it is clear that there needs to be some way to go from {\"x\": 123, \"y\": 456} to Cat(C(123, 16), C(456, 16)) without manually writing out the concatenation. There are two main options for this: Implement a new method, such that Point.const({\"x\": 123, \"y\": 456}) returns a constant of some kind (either an int or a Const or a constant-castable expression). Implement an additional .__init__() override, such that Point({\"x\": 123, \"y\": 456}) returns a view that has a constant-castable expression as its target. Option (1) has the benefit of making it clear when downstream code is creating a constant (and expects an argument where the nested data must all be constant), and of minimizing useless wrapping/unwrapping of views that would otherwise happen. It is an explicit type conversion (from a literal to Const). Option (2) avoids introducing new names. It is an implicit type conversion (from a literal to a view, which in this case is Point). In the end, option (1) seems preferable here since implicit type conversions are easy to unintentionally misuse. It also avoids any clashes with proposed RFC 8. Prior art None. Unresolved questions None. Future possibilities None.","breadcrumbs":"0009-const-init-shape-castable","id":"8","title":"0009-const-init-shape-castable"},"9":{"body":"Start Date: 2023-05-11 RFC PR: amaranth-lang/rfcs#10 Amaranth Issue: amaranth-lang/amaranth#770 Move Repl to Value.replicate Summary Replace the standalone Repl(value, count) node with value.replicate(count). Motivation Repl is a rarely used construct (it's mostly useful for manual sign extension). It is currently a first-class entity that has its own AST node and a name in the prelude, mostly for historical reasons (Repl(v, n) is analogous to Verilog's {x{n}}). Repl does not need to be a first-class entity; Repl(x, n) is almost exactly equivalent to Cat(x for x in range(n)). It especially does not need a name in the prelude. Guide-level explanation Use of Repl is deprecated. To replicate a value multiple times, use value.replicate(). Reference-level explanation Direct use of Repl is deprecated. Its implementation is replaced with def Repl(value, count): return Value.cast(value).replicate(count). A function Value.replicate(count) is added. It is implemented as Cat(value for _ in range(count)). The Repl AST node is removed. Drawbacks Churn. The proposed implementation makes Value.replicate valid on left-hand side of assignment, with potentially surprising behavior. However, this can be handled by prohibiting multiple assignment to the same bit of a signal in general. Rationale and alternatives Rationale: Fewer names in the prelude is always good. Unlike with Cat (where Cat() makes sense), Repl does not make sense as a standalone node any more than Part does (and we do not currently export Part). Despite existing by analogy with {x{n}}, it is currently turned into a concatenation before it reaches the Verilog backend anyway , and any future work will have to reconstruct replication from concatenation in any case. Repl being a dedicated node complicates AST processing for no reason. Alternatives: Do not do this. Prior art None. Unresolved questions None. Future possibilities The Verilog backend currently bitblasts what could be a replication. We could detect these and convert them to replications proper. 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