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Wasmtime Releases

0.19.0

Unreleased.

Added

Changed

Removed

0.18.0

Release 2020-06-09.

Added

The WasmTy trait is now implemented for u32 and u64.

#1808

0.17.0

Released 2020-06-01.

Added

  • The Commands and Reactors ABI is now supported in the Rust API. Linker::module loads a module and automatically handles Commands and Reactors semantics.

    #1565

The Table::grow function now returns the previous table size, making it consistent with the table.grow instruction.

#1653

New Wasmtime-specific C APIs for working with tables were added which provide more detailed error information and which make growing a table more consistent with the table.grow instruction as well.

#1654

The C API now includes support for enabling logging in Wasmtime.

#1737

Changed

The WASI proc_exit function no longer exits the host process. It now unwinds the callstack back to the wasm entrypoint, and the exit value is available from the Trap::i32_exit_status method.

#1646

The WebAssembly multi-value proposal is now enabled by default.

#1667

The Rust API does not require a store provided during Module::new operation. The Module can be send accross threads and instantiate for a specific store. The Instance::new now requires the store.

#1761

0.16.0

Released 2020-04-29.

Added

  • The Instance struct has new accessors, get_func, get_table, get_memory, and get_global for quickly looking up exported functions, tables, memories, and globals by name. #1524

  • The C API has a number of new wasmtime_* functions which return error objects to get detailed error information when an API fails. #1467

  • Users now have fine-grained control over creation of instances of Memory with a new MemoryCreator trait. #1400

  • Go bindings for Wasmtime are now available. #1481

  • APIs for looking up values in a Linker have been added. #1480

  • Preliminary support for AArch64, also known as ARM64. #1581

Changed

  • Instance::exports now returns Export objects which contain the names of the exports in addition to their Extern definitions, so it's no longer necessary to use Module::exports to obtain the export names. #1524

  • The Func::call API has changed its error type from Trap to anyhow::Error to distinguish between wasm traps and runtime violations (like the wrong number of parameters). #1467

  • A number of wasmtime_linker_* and wasmtime_config_* C APIs have new type signatures which reflect returning errors. #1467

  • Bindings for .NET have moved to https://github.com/bytecodealliance/wasmtime-dotnet. #1477

  • Passing too many imports to Instance::new is now considered an error. #1478

Fixed

  • Spurious segfaults due to out-of-stack conditions when handling signals have been fixed. #1315

0.15.0

Released 2020-03-31.

Fixed

Full release produced for all artifacts to account for hiccups in 0.13.0 and 0.14.0.

0.14.0

This version ended up not getting a full release

Fixed

Fix build errors in wasi-common on Windows.

0.13.0

Released 2020-03-24.

Added

  • Lots of documentation of wasmtime has been updated. Be sure to check out the book and API documentation!

  • All wasmtime example programs are now in a top-level examples directory and are available in both C and Rust. #1286

  • A wasmtime::Linker type was added to conveniently link link wasm modules together and create instances that reference one another. #1384

  • Wasmtime now has "jitdump" support enabled by default which allows profiling wasm code on linux. #1310

  • The wasmtime::Caller type now exists as a first-class way to access the caller's exports, namely memory, when implementing host APIs. This can be the first argument of functions defined with Func::new or Func::wrap which allows easily implementing methods which take a pointer into wasm memory. Note that this only works for accessing the caller's Memory for now and it must be exported. This will eventually be replaced with a more general-purpose mechanism like interface types. #1290

  • The bulk memory proposal has been fully implemented. #1264 #976

  • Virtual file support has been added to wasi-common. #701

  • The C API has been enhanced with a Wasmtime-specific wasmtime_wat2wasm to parse *.wat files via the C API. #1206

Changed

  • The wast and wasm2obj standalone binaries have been removed. They're available via the wasmtime wast and wasmtime wasm2obj subcommands. #1372

  • The wasi-common crate now uses the new wiggle crate to auto-generate a trait which is implemented for the current wasi snapshot. #1202

  • Wasmtime no longer has a dependency on a C++ compiler. #1365

  • The Func::wrapN APIs have been consolidated into one Func::wrap API. #1363

  • The Callable trait has been removed and now Func::new takes a closure directly. #1363

  • The Cranelift repository has been merged into the Wasmtime repository.

  • Support for interface types has been temporarily removed. #1292

  • The exit code of the wasmtime CLI has changed if the program traps. #1274

  • The wasmtime CLI now logs to stderr by default and the -d flag has been renamed to --log-to-file. #1266

  • Values cannot cross Store objects, meaning you can't instantiate a module with values from different stores nor pass values from different stores into methods. #1016

0.12.0

Released 2020-02-26.

Added

  • Support for the WebAssembly text annotations proposal has been added. #998

  • An initial C API for instantiating WASI modules has been added. #977

  • A new suite of Func::getN functions have been added to the wasmtime API to call statically-known function signatures in a highly optimized fashion. #955

  • Initial support for profiling JIT code through perf jitdump has been added. #360

  • More CLI flags corresponding to proposed WebAssembly features have been added. #917

Changed

  • The wasmtime CLI as well as embedding API will optimize WebAssembly code by default now. #973 #988

  • The verifier pass in Cranelift is now no longer run by default when using the embedding API. #882

Fixed

  • Code caching now accurately accounts for optimization levels, ensuring that if you ask for optimized code you're not accidentally handed unoptimized code from the cache. #974

  • Automated releases for tags should be up and running again, along with automatic publication of the wasmtime Python package. #971