Added

• Added a new validate crate feature to wasmi and wasmi_cli crates. 🚀
  • This feature controls whether Wasmi support Wasm validation.
  • The feature is enabled by default with --no-default-features.
  • Users who have full control over the Wasm inputs to Wasmi may
    have a great need for this as this can reduce binary artifact sizes
    by ~200-300kB.
  • PR: #1902
• Added new libm crate feature to Wasmi. #1860
  • This allows to enforce libm usage.
• Added support to Wasmi CLI to print funcref and externref with null value. #1839
• Add support for hexdec encoded integer args to Wasmi CLI. #1851

Changed

• Wasmi IR operators now store their results in accumulator registers. 🚀
  • With this, Wasmi uses the same interpreter architecture as the fastest Wasm interpreters, Wasm3 and Stitch.
  • Benchmarks concluded that Wasmi is on par and sometimes even exceeds performance of its competition now.
  • PRs:
    • #1827: Definitions for new Wasmi IR
    • #1855: Adjustments Wasmi Translator & Executor
  • Follow-up Optimizations:
    • #1895: Adds specialized i{32,64}.add operator variants.
    • #1896: Adds lowering from isub to iadd operators.
    • #1905: Make more SIMD operators return results in accumulator registers.
• New Wasmi execution optimizations: 🚀
  • Re-designed CodeMap to be lock-free & append-only. #1898
    • Wasmi makes full use of these CodeMap attributes which significantly
      improves Wasm to Wasm function call performance.
  • Only zero-initialize non-parameter function locals upon Wasm call. #1893
    • This significantly improves Wasm to Wasm function call performance.
  • CLI: disallow v128 argument types. #1848
    • With this Wasmi CLI now mirrors Wasmtime CLI's behavior.
  • Improve instance preservation of same-instance calls. #1878
  • Translate ref.is_null via i32.eqz instead of i64.eqz. #1861

Fixed

• Fix operand order in v128_select_ssss translation. #1834
  • Thanks to @shumbo for the fix!
• Fix re-extraction of mem0 after host function calls. #1837
  • Thanks to @npiesco for the fix!
• Fixed incorrect NaN behavior for f{32,64}.{ceil,floor,trunc}. #1860

Internal

• Automatically create release artifacts for Wasmi GitHub releases. #1906
• Added flag to steer LLVM away from bad codegen. #1873
• Added missing std crate feature forward from wasmi to wasmi_ir. #1862
• Update Wasmtime fuzzing oracle to v45. #1867
• Make benchmarks test properly under Windows. #1885
• Fixed a bug that wat based tests were not ignored on !wat. #1883
• Added a whole variety of new Rust based benchmarks:
  • PRs:
    • #1870 : sort, matrix_mul, prime_sieve
    • #1871 : n-body: physics simulation
    • #1872 : argon2: password hashing
    • #1877 :
      • mandelbrot
      • spetralnorm
      • json_parsing
      • compression
      • word_count

Changed

• Updated the wasmparser dependency from v0.228 to v0.239.
• Add convenience From<{f32,f64}> for Val impls.

Added

• Added unstable crate feature to wasmi, wasmi_wast and wasmi_cli crates. #1825
  • This enables unstable rustc features available in nightly Rust releases.
  • Concretely, this enables usage of Rust's unstable become keyword to enforce
    tail-calls in its instruction dispatch when portable-dispatch is disabled.
  • Enable become with cargo build --no-default-features --features unstable.
• Added proper README.md to Wasmi's CLI application. #1824

Changed

• Clean-up ResourceLimiter API. #1817
  • StoreLimits now properly enforce panics if trap_on_grow_failure was enabled.
  • memory_grow_failed and table_grow_failed now take MemoryError and TableError respectively.
  • LimiterError is now a single variant enum making its use much simpler.

Fixed

• CLI: fixed a panic when using the run command without arguments. #1810
  • Thanks to polarathene for reporting the issue.
• Fixed an integer-overflow bug in the internal Table::set_raw API. #1818
  • Thanks to sumleo for reporting the issue.
• Fixed a potential bug with local.set translation and SIMD. #1821

Internal

• Redesigned Wasmi's internal select operators. #1823
  • The new design is simpler, performs similarly and requires fewer select operators.

Changed

• Wasmi's internal Handle trait no longer has a From super-trait. #1804
  • This fixes an issue from users with conflicting From impls for Wasmi handles
    such as Func, Global, etc..

Added

• Implemented some improvements for wasmi::Table.
  • Added Ref and RefType and make wasmi::Table operate on Ref instead of Val. #1747
    • This has be beneficial side-effect that wasmi::Table is now unaffected by
      the simd crate feature and no longer suffers from increased memory consumption.
    • Furthermore, this improves Wasmi's Wasmtime API mirror as Wasmtime also uses Ref and RefType.
  • Shrink wasmi::Table elements from 64-bit to 32-bit. #1776
    • This effectively halfs the memory consumption of wasmi::Table instances.
• Designed and integrated an entirely new internal IR for Wasmi. #1655
  • This affects both execution and translation performance.
  • New crate features have been added:
    • portable-dispatch:
      Enable to compile Wasmi on any platform supported by Rust
      However, this may significantly reduce execution performance.
    • indirect-dispatch:
      Enable to use less encoding space for Wasmi's internal IR.
      However, this may significantly reduce execution performance.
• Wasmi's executor now uses fixed 64-bits cells. #1755
  • This technically is an internal change but it yields observable improvements for users.
  • Enabling the simd crate feature no longer affects memory consumption or
    execution performance of non-simd Wasm code.
• Implement a variety of improvements for the Wasmi CLI application.
  • Added a bunch of new crate features to the wasmi_cli crate:
    • PRs: #1784 #1787 #1788
    • wasi: Enable WASI support. (default: ✅)
    • wast: Enable Wast support and wast command. (default: ✅)
    • run: Enable the run command (default: ✅)
    • portable-dispatch: Enable wasmi's portable-dispatch crate feature. (default: ❌)
    • indirect-dispatch: Enable wasmi's indirect-dispatch crate feature. (default: ❌)
  • Similar to Wasmtime's CLI, Wasmi now also features sub-commands: #1799
    • run: Executes a WebAssembly module.
    • wast: Executes a WebAssembly script.
  • The Wasmi CLI's command has been renamed from wasmi_cli to just wasmi. #1798
• Add wasmi_wasi::add_to_externals API. #1785
  • This is more efficient than the existing add_to_linker API and should
    be used instead if possible.
  • The Wasmi CLI application now makes use of this API in order to prepare
    its WASI environment.

Changed

• Wasmi now uses Rust edition 2024 in the entire workspace. #1759
  • This does not affect users since Wasmi's MSRV did not change.

Internal

• Use OIDC in Wasmi coverage CI job. #1745
• Wasmi differential fuzzing oracles are not optionally included. #1758
  • This allows to exclude fuzzing oracles to speed-up fuzzing and compile times.
• Add a new GitHub Actions CI job to check via cargo-deny. #1761
• Refactored wasmi_collections arena data structures. #1771
• Removed ancient Wasmi v0.31 as oracle for differential fuzzing. #1777
• Renamed internal Untyped{Val,Ref} types to Raw{Val,Ref}. #1781
• Refactor and unify Wasmi's internal handle types. #1772

Fixed

• Fixed a bug that Wasmi's translator would sometimes incorrectly merge copy instructions. #1779

Fixed

• Fixed another bug with incorrect translation of wide-arithmetic ops followed by local.set. #1762

Fixed

• Fixed a bug that local.set fusion with some wide-arithmetic ops was working incorrectly. #1756
  • Thanks to louismerlin for the detailed bug report.

Fixed

• Fixed a bug that local preservation of Wasm loops was missing. #1748
  • Thanks to davnavr for reporting the bug.

Fixed

• Fix a bug in the execution of i{32,64}.rem_s(MAX, -1). rev-1c3682f
  • The Wasm spec demanded to return 0 while Wasmi trapped with integer-overflow.
  • Thanks to davnavr for the detailed bug report.