From b323a663b58faf55ef288c0c48a93f558800ce6a Mon Sep 17 00:00:00 2001 From: Lonca Emmanuel Date: Fri, 22 Nov 2024 14:36:23 +0100 Subject: [PATCH] added LICENSE + comments --- Cargo.toml | 13 ++ LICENSE | 674 +++++++++++++++++++++++++++++++++++++++++++++++++++++ README.md | 31 ++- src/lib.rs | 128 ++++++++-- 4 files changed, 827 insertions(+), 19 deletions(-) create mode 100644 LICENSE diff --git a/Cargo.toml b/Cargo.toml index 4ce353b..ff84d91 100644 --- a/Cargo.toml +++ b/Cargo.toml @@ -1,7 +1,20 @@ [package] name = "ipasir-loading" +authors = ["Emmanuel Lonca "] +license = "GPL-3.0-or-later" version = "0.1.0" +description = "Load shared libraries of IPASIR compatible SAT solvers." +categories = ["external-ffi-bindings", "science"] +keywords = ["sat", "solver", "satisfiability", "ipasir"] +repository = "https://github.com/crillab/ipasir-loading" edition = "2021" +rust-version = "1.58.1" + +[lints.rust] +missing_docs = "warn" + +[lints.clippy] +pedantic = { level = "warn", priority = -1 } [dependencies] anyhow = "1.0.93" diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..f600cf4 --- /dev/null +++ b/LICENSE @@ -0,0 +1,674 @@ + GNU GENERAL PUBLIC LICENSE + Version 3, 29 June 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU General Public License is a free, copyleft license for +software and other kinds of works. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. 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It is safest +to attach them to the start of each source file to most effectively +state the exclusion of warranty; and each file should have at least +the "copyright" line and a pointer to where the full notice is found. + + + Copyright (C) 2024 Lonca Emmanuel + + This program is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation, either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see . + +Also add information on how to contact you by electronic and paper mail. + + If the program does terminal interaction, make it output a short +notice like this when it starts in an interactive mode: + + ipasir-loading Copyright (C) 2024 Lonca Emmanuel + This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. + This is free software, and you are welcome to redistribute it + under certain conditions; type `show c' for details. + +The hypothetical commands `show w' and `show c' should show the appropriate +parts of the General Public License. Of course, your program's commands +might be different; for a GUI interface, you would use an "about box". + + You should also get your employer (if you work as a programmer) or school, +if any, to sign a "copyright disclaimer" for the program, if necessary. +For more information on this, and how to apply and follow the GNU GPL, see +. + + The GNU General Public License does not permit incorporating your program +into proprietary programs. If your program is a subroutine library, you +may consider it more useful to permit linking proprietary applications with +the library. If this is what you want to do, use the GNU Lesser General +Public License instead of this License. But first, please read +. diff --git a/README.md b/README.md index c5e9a88..1133b6e 100644 --- a/README.md +++ b/README.md @@ -2,4 +2,33 @@ Ipasir-loading is designed to load shared libraries of IPASIR compatible SAT solvers. IPASIR is implemented by several SAT solvers, allowing them to be used in an easy and standardized way. -See the [SAT competition 2020 webpage](https://satcompetition.github.io/2020/track_incremental.html) for more information about IPASIR. \ No newline at end of file +See the [SAT competition 2020 webpage](https://satcompetition.github.io/2020/track_incremental.html) for more information about IPASIR. + +## Example of use + +```no_run +# use ipasir_loading::IpasirSolverLoader; +// load the IPASIR library +let loader = IpasirSolverLoader::from_path("path/to/lib.so").unwrap(); + +// create a solver from the library and populate it +let mut solver = loader.new_solver().unwrap(); +solver.ipasir_add(-1).unwrap(); +solver.ipasir_add(-2).unwrap(); +solver.ipasir_add(0).unwrap(); +solver.ipasir_add(1).unwrap(); +solver.ipasir_add(2).unwrap(); +solver.ipasir_add(0).unwrap(); + +// check satisfiability and get back the model +assert!(solver.ipasir_solve().unwrap().unwrap()); +let model = vec![solver.ipasir_val(1).unwrap(), solver.ipasir_val(2).unwrap()]; +let expected_1 = vec![Some(true), Some(false)]; +let expected_2 = vec![Some(false), Some(true)]; +assert!(model == expected_1 || model == expected_2); +``` + +## License + +Ipasir-loading is developed at CRIL (Univ. Artois & CNRS). +It is distributed under the terms of the GNU GPLv3 license. diff --git a/src/lib.rs b/src/lib.rs index 10d38df..8f72bda 100644 --- a/src/lib.rs +++ b/src/lib.rs @@ -1,3 +1,5 @@ +#![doc = include_str!("../README.md")] + use anyhow::{anyhow, Result}; use core::slice; use libloading::{Library, Symbol}; @@ -36,6 +38,11 @@ pub struct IpasirSolverLoader { impl IpasirSolverLoader { /// Builds a new [`IpasirSolverLoader`] given a path to a shared library containing a SAT solver that conform to the IPASIR specification. + /// + /// # Errors + /// + /// This function returns an error if the library cannot be loaded, + /// e.g. if the path does not point to a shared library. pub fn from_path>(path: P) -> Result { let library = unsafe { Library::new(path)? }; Ok(Self { @@ -46,6 +53,11 @@ impl IpasirSolverLoader { } /// Returns a string describing the name and the version of the library solver. + /// + /// # Errors + /// + /// This function returns an error if the library does not include the corresponding IPASIR function, + /// or if an error occurs when calling it. pub fn ipasir_signature(&self) -> Result { let c_str_signature = unsafe { let function: Symbol *const c_char> = @@ -56,6 +68,16 @@ impl IpasirSolverLoader { } /// Builds a new SAT solver from the shared library. + /// + /// The returned solver can accept callback functions on termination or when learning a clause + /// only if the appropriate activation functions ([`enable_set_terminate`](IpasirSolverLoader::enable_set_terminate) or [`enable_set_learn`](IpasirSolverLoader::enable_set_learn)) have been called before calling this function. + /// + /// # Errors + /// + /// This function returns an error if the library does not contain the `ipasir_init` function, + /// or if an error occurs when calling it. + /// In case some callback functions are enabled, + /// this function will also return an error if the corresponding IPASIR callback function (`ipasir_set_terminate` or `ipasir_set_learn`) is missing from the library or if an error occurs when calling it. pub fn new_solver(&self) -> Result { let solver_ptr = unsafe { let init_function: Symbol *const c_void> = @@ -80,7 +102,7 @@ impl IpasirSolverLoader { Ok(IpasirSolverWrapper(ipasir_solver_box)) } - /// Enables or disables the [ipasir_set_terminate](IpasirSolver::ipasir_set_terminate) for the solvers created after the call to this function. + /// Enables or disables the [`ipasir_set_terminate`](IpasirSolver::ipasir_set_terminate) for the solvers created after the call to this function. pub fn enable_set_terminate(&mut self, v: bool) { self.enable_set_terminate = v; } @@ -100,14 +122,14 @@ impl IpasirSolverLoader { > = loader.library.get(b"ipasir_set_terminate")?; set_terminate_function( solver_ptr, - &mut *ipasir_solver_box as *const _ as *const _, + std::ptr::addr_of_mut!(*ipasir_solver_box) as *const _, ipasir_set_terminate_callback as *const _, ); } Ok(()) } - /// Enables or disables the [ipasir_set_learn](IpasirSolver::ipasir_set_learn) for the solvers created after the call to this function. + /// Enables or disables the [`ipasir_set_learn`](IpasirSolver::ipasir_set_learn) for the solvers created after the call to this function. /// /// To enable the function, pass `Some(n)` where `n` is the maximum length of the learned clauses you are interested in. /// To disable the function, pass `None`. @@ -132,7 +154,7 @@ impl IpasirSolverLoader { > = loader.library.get(b"ipasir_set_learn")?; set_learn_function( solver_ptr, - &mut *ipasir_solver_box as *const _ as *const _, + std::ptr::addr_of_mut!(*ipasir_solver_box) as *const _, max_length, ipasir_set_learn_callback as *const _, ); @@ -154,11 +176,7 @@ extern "C" fn ipasir_set_terminate_callback(solver_ptr: *const IpasirSolver) -> .iter() .any(|callback| callback()) }; - if must_terminate { - 1 - } else { - 0 - } + isize::from(must_terminate) } extern "C" fn ipasir_set_learn_callback(solver_ptr: *const IpasirSolver, clause_ptr: *const i32) { @@ -173,7 +191,7 @@ extern "C" fn ipasir_set_learn_callback(solver_ptr: *const IpasirSolver, clause_ (*solver_ptr) .set_learn_callbacks .iter() - .for_each(|callback| callback(clause)) + .for_each(|callback| callback(clause)); }; } @@ -206,11 +224,11 @@ enum SolverState { } impl SolverState { - fn expect_status(&self, expected: Self) -> Result<()> { - if *self != expected { - Err(anyhow!("expected status {expected:?}, was {self:?}")) - } else { + fn expect_status(self, expected: Self) -> Result<()> { + if self == expected { Ok(()) + } else { + Err(anyhow!("expected status {expected:?}, was {self:?}")) } } @@ -229,7 +247,30 @@ impl SolverState { /// All of the functions below, except the callback functions, are just safe interfaces to the IPASIR functions of the same name. /// For the two functions where the behavior differs from the specification, this is indicated in the function documentation. /// -/// When the [`IpasirSolver`] is dropped, the underlying data is automatically released by a call to `ipasir_release`. +/// When the [`IpasirSolver`] is dropped, the underlying data is automatically released by calling the `ipasir_release` function from the loaded library. +/// Note that an error encountered in this function can lead to a panic. +/// +/// ```no_run +/// # use ipasir_loading::IpasirSolverLoader; +/// // load the IPASIR library +/// let loader = IpasirSolverLoader::from_path("path/to/lib.so").unwrap(); +/// +/// // create a solver from the library and populate it +/// let mut solver = loader.new_solver().unwrap(); +/// solver.ipasir_add(-1).unwrap(); +/// solver.ipasir_add(-2).unwrap(); +/// solver.ipasir_add(0).unwrap(); +/// solver.ipasir_add(1).unwrap(); +/// solver.ipasir_add(2).unwrap(); +/// solver.ipasir_add(0).unwrap(); +/// +/// // check satisfiability and get back the model +/// assert!(solver.ipasir_solve().unwrap().unwrap()); +/// let model = vec![solver.ipasir_val(1).unwrap(), solver.ipasir_val(2).unwrap()]; +/// let expected_1 = vec![Some(true), Some(false)]; +/// let expected_2 = vec![Some(false), Some(true)]; +/// assert!(model == expected_1 || model == expected_2); +/// ``` pub struct IpasirSolver { library: Rc, solver: *const c_void, @@ -242,6 +283,11 @@ pub struct IpasirSolver { impl IpasirSolver { /// Add the given literal into the currently added clause or finalize the clause with a 0. + /// + /// # Errors + /// + /// This function returns an error if the library does not include the corresponding IPASIR function, + /// or if an error occurs when calling it. pub fn ipasir_add(&mut self, lit: i32) -> Result<()> { unsafe { let function: Symbol = @@ -256,6 +302,11 @@ impl IpasirSolver { /// /// The solver returns an `Option` containing `true` (resp. `false`) if the formula is satisfiable, /// or `None` if the search was stopped before deciding the satisfiability. + /// + /// # Errors + /// + /// This function returns an error if the library does not include the corresponding IPASIR function, + /// or if an error occurs when calling it. pub fn ipasir_solve(&mut self) -> Result> { let status = unsafe { let function: Symbol isize> = @@ -278,6 +329,11 @@ impl IpasirSolver { /// /// This function returns an `Option` containing `true` (resp. `false`) if the variable was set to `true` (resp. `false`) in the last satisfying assignment. /// In case the solver detected both polarities of the literal would lead to a model, `None` may be returned. + /// + /// # Errors + /// + /// This function returns an error if the library does not include the corresponding IPASIR function, + /// or if an error occurs when calling it. pub fn ipasir_val(&mut self, lit: i32) -> Result> { self.state.expect_status(SolverState::Sat)?; let value = unsafe { @@ -293,8 +349,13 @@ impl IpasirSolver { } } - /// Add an assumption for the next SAT search (the next call of ipasir_solve). - /// After calling ipasir_solve all the previously added assumptions are cleared. + /// Add an assumption for the next SAT search (the next call of [`ipasir_solve`](Self::ipasir_solve)). + /// After calling [`ipasir_solve`](Self::ipasir_solve) all the previously added assumptions are cleared. + /// + /// # Errors + /// + /// This function returns an error if the library does not include the corresponding IPASIR function, + /// or if an error occurs when calling it. pub fn ipasir_assume(&mut self, lit: i32) -> Result<()> { unsafe { let function: Symbol = @@ -308,6 +369,11 @@ impl IpasirSolver { /// Check if the given assumption literal was used to prove the unsatisfiability of the formula under the assumptions used for the last SAT search. /// This function must not be called if the formula changed since the last time `ipasir_solve` proved the unsatisfiability of the formula. /// Return `true` if so, `false` otherwise. + /// + /// # Errors + /// + /// This function returns an error if the library does not include the corresponding IPASIR function, + /// or if an error occurs when calling it. pub fn ipasir_failed(&mut self, lit: i32) -> Result { self.state.expect_status(SolverState::Unsat)?; let value = unsafe { @@ -331,6 +397,10 @@ impl IpasirSolver { /// If the function returns `true`, the solver should terminate. /// /// Contrary to the IPASIR specification, more than one callback function can be set in this way. + /// + /// # Errors + /// + /// This function will return an error if the correct type of callback function has not been enabled prior to the creation of the solver. pub fn ipasir_set_terminate(&mut self, callback: SetTerminateCallbackType) -> Result<()> { if self.enable_set_terminate { self.set_terminate_callbacks.push(callback); @@ -341,10 +411,14 @@ impl IpasirSolver { } /// Add a callback function to be called when a clause is learned by the solver. - /// The [`IpasirSolverLoader`] that created this solver must have enabled such callbacks with [`enable_set_learn`](IpasirSolverLoader::enable_set_terminate). + /// The [`IpasirSolverLoader`] that created this solver must have enabled such callbacks with [`enable_set_learn`](IpasirSolverLoader::enable_set_learn). /// /// Contrary to the IPASIR specification, more than one callback function can be set in this way. /// The maximum length of the clauses passed to the callbacks is defined when enabling the callbacks in [`IpasirSolverLoader`]. + /// + /// # Errors + /// + /// This function will return an error if the correct type of callback function has not been enabled prior to the creation of the solver. pub fn ipasir_set_learn(&mut self, callback: SetLearnCallbackType) -> Result<()> { if self.enable_set_learn.is_some() { self.set_learn_callbacks.push(callback); @@ -464,6 +538,7 @@ mod tests { assert!(!solver.ipasir_failed(2).unwrap()); } + #[allow(clippy::cast_possible_truncation, clippy::cast_possible_wrap)] fn encode_php(solver: &mut IpasirSolver, n: usize) { let n = n as i32; let mut add_clause = |lits: &[i32]| { @@ -567,4 +642,21 @@ mod tests { assert!(!solver.ipasir_solve().unwrap().unwrap()); solver.ipasir_val(1).unwrap_err(); } + + #[test] + fn test_xor() { + let loader = solver_loader_or_return!(); + let mut solver = loader.new_solver().unwrap(); + solver.ipasir_add(-1).unwrap(); + solver.ipasir_add(-2).unwrap(); + solver.ipasir_add(0).unwrap(); + solver.ipasir_add(1).unwrap(); + solver.ipasir_add(2).unwrap(); + solver.ipasir_add(0).unwrap(); + assert!(solver.ipasir_solve().unwrap().unwrap()); + let model = vec![solver.ipasir_val(1).unwrap(), solver.ipasir_val(2).unwrap()]; + let expected_1 = vec![Some(true), Some(false)]; + let expected_2 = vec![Some(false), Some(true)]; + assert!(model == expected_1 || model == expected_2); + } }