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CHANGELOG.md

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Espresso Changelog

Version 22.1.0

User-visible changes

  • Added HotSwap support for changing the super class and implemented interfaces.
  • Added HotSwap support for 'Move Field in Hierarchy' refactoring where state is preserved.
  • HotSwap support for changing fields and class access modifiers are now turned on by default.

Internal changes

  • The truffle AbstractTruffleException API is now fully adopted.
  • Better integration with the Truffle safepoint API
  • Add new implementation for reading jimages (libs/modules) . It is used by default, --java.JImage=native can be used to revert to the old implementation.
  • New command: <ProcessReferences>. Allows embedders to manually trigger reference processing in single-threaded mode.

Version 22.0.0

User-visible changes

  • New HotSwap support for changing fields. Enable with the --java.ArbitraryChangesSupport=true experimental flag.
  • New HotSwap support for changing class access modifiers. Enable with the --java.ArbitraryChangesSupport=true experimental flag.
  • Added support for running native code with the LLVM runtime. This can be enabled with the --java.NativeBackend=nfi-llvm experimental flag. Native JDK libraries can be installed with gu install espresso-llvm. When installed, those libraries will be picked up by the nfi-llvm native backend. This allows to bypass some limitations of the default native backend (nfi-dlmopen). In particular, it avoids crashes that can happen on some glibc versions when using multiple contexts.

Internal changes

  • Espresso adopted the new Frame API.

Noteworthy fixes

  • Fix Strings sometimes not properly displayed in the debugger view through JDWP

Version 21.3.0

User-visible changes

  • Java 17 guest and host support.
  • Support using interop buffer-like object as a byte[] in espresso.
  • Add buffer interop messages to the explicit interop API.
  • The Polyglot API is not enabled by default anymore. When needed, contexts should be created with the java.Polyglot option set to true.
  • The HotSwapAPI is not auto-enabled by debugging anymore. When needed, contexts should be created with the java.HotSwapAPI option set to true.
  • Avoid illegal reflective access warnings with host Java >= 11.

Internal changes

  • The Static Object Model has moved to Truffle.
  • On-Stack-Replacement using the new Truffle bytecode OSR API.
  • Detect and report trivial methods.
  • Enable saturated type flows.

Noteworthy fixes

  • Performance and functional related to JDWP.
  • Fix some crashes observed when using the JNA.