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Wasm Compiler Release Notes

4.0.0

Feature

  • Fix SPDX format

  • Support multi return values import function(not call_indirect)

  • Support immutable import globals

  • Support default import API 'dumpMemoryRegion'

  • Performance improvements:

    • 2% code size reduce on tricore
    • 2% cpu performance improvement on polybench
    • faster function call by less reg spills and moves than v3

Bug Fixes

  • Fixed the problem that load opcode will trigger Implement Limitation on TRICORE.
  • Fixed the misbehavior of wasm memcpy on x86 backend
  • Fix SPDX format
  • Fix encoding compatibility
  • Fixed wrong machine type for type_cast instruction
  • Fix missed signatureType in findGlobalByName
  • x86_64 backend:
    • fix wrong register selection of f32/f64 max/min.
  • Tricore backend:
    • fixed i32.load16_s and i32.load16_u producing incorrect results with unaligned addresses due to shared load cache between signed and unsigned variants

Internal changes

  • Condense order changed to top->end

3.0.3

Add u32 and u64 type to WasmValue

3.0.2

Feature

  • Add version number to checking to binary module

Bug Fixes

  • Fixed the issue where each memory access on TRICORE would call the memory extend function.
  • Fixed the issue where setMaxRam will crash when wasm module does not initialize runtime.

3.0.1

Bug Fixes

  • Fixed memory.grow will provide wrong page size to runtime.

3.0.0

Feature

  • Implemented multi values feature.
  • Refine signal handler for better working with system coredump. (cherry-pick from 2.3.4)
  • Add a WasmModule class wrappers over raw compiler and runtime. It saves integrator from handling low level interfaces.
  • Add experimental support for DWARF5 debugging symbols.
  • API abortTrap is removed.
  • Import functions must assign last parameter as a T* context.
  • Add builtin.tracePoint API for tracing without performance overhead.
    • Tracing Extension is designed for record this trace points and write to file.

Bug Fixes

  • Fixed builtin.isFunctionLinked return incorrect result when index larger than 256. (cherry-pick from 2.3.5)
  • Fixed that recoverGlobalsToRegs will dirty write addrParamRegs[3] in exported function wrapper (with multi values).
  • Fixed emitted instructions for select, keep CPUFlags unchanged.
  • Fixed API function can't interrupt a Module when the API is call indirectly

Breaking Changes

  • Unify exported ModuleFunction, RawModuleFunction API.
  • Trap code is cleaned at exit of Wasm function call
  • Add check of mmap failed in MemUtils
  • Added compilerMemoryAllocFnc and compilerMemoryFreeFnc used for compiler-time-stack memory management in Compiler construction, and allow user-defined context (like maxRAM).

Tricore backend

  • Stop supporting of tc1.6 and only support tc1.8

Release v2 known issues

2.2.3

  • Replace vb_MemUtils with vb_libutils for tricore backend.

Bug Fixes

  • Fixed incorrect parameter alignment in runtime.
  • TriCore Backend: Fix f32NanToCanonical assert failure

2.2.2

  • Use LINEAR_MEMORY_BOUNDS_CHECKS on real time operation system e.g. QNX by default.
  • builtin.isFunctionLinked takes table index as parameter instead of function index. This change is for consistency with frontend compiler.

Bug fixes

  • Fix mis use of fucIndex and sigIndex in tricore emitWasmToNativeAdapter, which may lead to crash.

2.2.1

Bug Fixes

  • Fixed compile errors in Exception::what introduced by VB_DISABLE_NOEXCEPT.

2.2.0

Feature

  • Streamlined stacktrace implementation.
  • Implemented sign extension instructions.
  • Implemented bulk memory memory.copy and memory.fill instructions.
  • Added support for debugging Wasm modules.
  • Added new builtin function: copyFromLinkedMemory.
  • add persistent mode of signal handler

Improvement

  • During call import function, only save volatile registers and native ABI parameter registers
  • Added compilation option VB_DISABLE_NOEXCEPT to disable noexcept.
  • Optimized emitted jit code for drop opcode.
  • Changed WasmABI, store and recover in reg local on demand (#118).
  • Introduced control flow analysis to reduce check stack fences in active stack overflow check mode.
  • Allocated register for the first i32 global.
  • Optimized emitted jit code for br_table opcode.
  • Refactor compile flow of select instruction
  • TriCore Backend
    • Optimized emitted jit code for ctz opcode.
    • Optimized memory bound check with FCALL and FRET instructions.
    • Optimized with 16bit instructions for mov/add/ldr/str/eq/lt.
    • Improved performance of 64-bit add/sub/and/or/xor.
    • Improved performance of compare with imm.
    • Supported odd length of linked memory.

Breaking Changes

  • Replaced "eager" parameter of LinearMemoryAllocator with a compile-time config EAGER_ALLOCATION so compiler can take advantage of this setting.

  • ILogger receives Span<char const> const & as parameter.

Bug fixes

  • Fixed a bug where block-expr following an always-negated if-expr would emit incorrect jit code.
  • Fixed a bug where target result types mismatched br_table in unreachable block would fail module validation.
  • Fixed a bug where high register pressure will crash the compiler.
  • TriCore Backend
    • Fixed a bug where parameters reg will be overwritten.
    • Fixed a bug where load will overwrite other scratch registers.

2.1.3

  • Compiler can now take an rvalue reference of the output binary directly.

2.1.2

  • Fixed incorrect trap error messages.

2.1.1

  • Fixed a bug where compilation could fail with unknown/missing imports.

2.1.0

  • Added an option to allow compilation with unknown/missing imports. Calling such a function will produce a trap with TrapCode::CALLED_FUNCTION_NOT_LINKED
  • Added a new builtin function isFunctionLinked which takes a function index as parameter and returns 1 if this function is linked (or defined in the Wasm module, i.e. can be called) and 0 otherwise
  • Removed config option USE_MOCK_IMPORTS
  • Added an optimization so if(-else) statements for which the condition can be evaluated at compile-time only produce one of the two blocks and no branch
  • Removed auto-unlink feature and the corresponding entry in config.hpp
  • Optimized trap handling and reordered TrapCode enum entries

2.0.5

  • Linked memory is now auto-unlinked by default when a new API call is performed. This can be configured in config.hpp.
  • Improvements for TriCore
    • Remove unneeded destructor, static variables and do not rely on global variables being initialized
    • TriCore will now default to statically linked AUX functions