--------------------------------------------------------------------------------
## 13.0.0
Unreleased.
### Added
* Configuration of mach ports vs signals on macOS is now done through a `Config`
instead of at compile time.
[#6807 ](https://github.com/bytecodealliance/wasmtime/pull/6807 )
* `Engine::detect_precompiled` can be used to to determine whether some bytes
look like a precompiled module or a component.
[#6832 ](https://github.com/bytecodealliance/wasmtime/pull/6832 )
* A new feature "wmemcheck" has been added to enable Valgrind-like detection of
use-after-free within a WebAssembly guest module.
[#6820 ](https://github.com/bytecodealliance/wasmtime/pull/6820 )
[#6856 ](https://github.com/bytecodealliance/wasmtime/pull/6856 )
* The `wasmtime` CLI now supports executing components.
[#6836 ](https://github.com/bytecodealliance/wasmtime/pull/6836 )
* Support for WASI preview2's TCP sockets interface has been added.
[#6837 ](https://github.com/bytecodealliance/wasmtime/pull/6837 )
* Wasmtime's implementation of the wasi-nn proposal now supports named models.
[#6854 ](https://github.com/bytecodealliance/wasmtime/pull/6854 )
* The C API now supports configuring `native_unwind_info` and
`dynamic_memory_reserved_for_growth` .
[#6896 ](https://github.com/bytecodealliance/wasmtime/pull/6896 )
### Changed
Wasmtime: refactor the pooling allocator for components (#6835)
* Wasmtime: Rename `IndexAllocator` to `ModuleAffinityIndexAllocator`
We will have multiple kinds of index allocators soon, so clarify which one this
is.
* Wasmtime: Introduce a simple index allocator
This will be used in future commits refactoring the pooling allocator.
* Wasmtime: refactor the pooling allocator for components
We used to have one index allocator, an index per instance, and give out N
tables and M memories to every instance regardless how many tables and memories
they need.
Now we have an index allocator for memories and another for tables. An instance
isn't associated with a single instance, each of its memories and tables have an
index. We allocate exactly as many tables and memories as the instance actually
needs.
Ultimately, this gives us better component support, where a component instance
might have varying numbers of internal tables and memories.
Additionally, you can now limit the number of tables, memories, and core
instances a single component can allocate from the pooling allocator, even if
there is the capacity for that many available. This is to give embedders tools
to limit individual component instances and prevent them from hogging too much
of the pooling allocator's resources.
* Remove unused file
Messed up from rebasing, this code is actually just inline in the index
allocator module.
* Address review feedback
* Fix benchmarks build
* Fix ignoring test under miri
The `async_functions` module is not even compiled-but-ignored with miri, it is
completely `cfg`ed off. Therefore we ahve to do the same with this test that
imports stuff from that module.
* Fix doc links
* Allow testing utilities to be unused
The exact `cfg`s that unlock the tests that use these are platform and feature
dependent and ends up being like 5 things and super long. Simpler to just allow
unused for when we are testing on other platforms or don't have the compile time
features enabled.
* Debug assert that the pool is empty on drop, per Alex's suggestion
Also fix a couple scenarios where we could leak indices if allocating an index
for a memory/table succeeded but then creating the memory/table itself failed.
* Fix windows compile errors
1 year ago
* The pooling allocator was significantly refactored and the
`PoolingAllocationConfig` has some minor breaking API changes that reflect
those changes.
Previously, the pooling allocator had `count` slots, and each slot had `N`
memories and `M` tables. Every allocated instance would reserve those `N`
memories and `M` tables regardless whether it actually needed them all or
not. This could lead to some waste and over-allocation when a module used less
memories and tables than the pooling allocator's configured maximums.
After the refactors in this release, the pooling allocator doesn't have
one-size-fits-all slots anymore. Instead, memories and tables are in separate
pools that can be allocated from independently, and we allocate exactly as
many memories and tables as are necessary for the instance being allocated.
To preserve your old configuration with the new methods you can do the following:
```rust
let mut config = PoolingAllocationConfig::default();
// If you used to have this old, no-longer-compiling configuration:
config.count(count);
config.instance_memories(n);
config.instance_tables(m);
// You can use these equivalent settings for the new config methods:
config.total_core_instances(count);
config.total_stacks(count); // If using the `async` feature.
config.total_memories(count * n);
config.max_memories_per_module(n);
config.total_tables(count * m);
config.max_tables_per_module(m);
```
There are additionally a variety of methods to limit the maximum amount of
resources a single core Wasm or component instance can take from the pool:
* `PoolingAllocationConfig::max_memories_per_module`
* `PoolingAllocationConfig::max_tables_per_module`
* `PoolingAllocationConfig::max_memories_per_component`
* `PoolingAllocationConfig::max_tables_per_component`
* `PoolingAllocationConfig::max_core_instances_per_component`
These methods do not affect the size of the pre-allocated pool.
[#6835 ](https://github.com/bytecodealliance/wasmtime/pull/6835 )
Wasmtime: refactor the pooling allocator for components (#6835)
* Wasmtime: Rename `IndexAllocator` to `ModuleAffinityIndexAllocator`
We will have multiple kinds of index allocators soon, so clarify which one this
is.
* Wasmtime: Introduce a simple index allocator
This will be used in future commits refactoring the pooling allocator.
* Wasmtime: refactor the pooling allocator for components
We used to have one index allocator, an index per instance, and give out N
tables and M memories to every instance regardless how many tables and memories
they need.
Now we have an index allocator for memories and another for tables. An instance
isn't associated with a single instance, each of its memories and tables have an
index. We allocate exactly as many tables and memories as the instance actually
needs.
Ultimately, this gives us better component support, where a component instance
might have varying numbers of internal tables and memories.
Additionally, you can now limit the number of tables, memories, and core
instances a single component can allocate from the pooling allocator, even if
there is the capacity for that many available. This is to give embedders tools
to limit individual component instances and prevent them from hogging too much
of the pooling allocator's resources.
* Remove unused file
Messed up from rebasing, this code is actually just inline in the index
allocator module.
* Address review feedback
* Fix benchmarks build
* Fix ignoring test under miri
The `async_functions` module is not even compiled-but-ignored with miri, it is
completely `cfg`ed off. Therefore we ahve to do the same with this test that
imports stuff from that module.
* Fix doc links
* Allow testing utilities to be unused
The exact `cfg`s that unlock the tests that use these are platform and feature
dependent and ends up being like 5 things and super long. Simpler to just allow
unused for when we are testing on other platforms or don't have the compile time
features enabled.
* Debug assert that the pool is empty on drop, per Alex's suggestion
Also fix a couple scenarios where we could leak indices if allocating an index
for a memory/table succeeded but then creating the memory/table itself failed.
* Fix windows compile errors
1 year ago
* Builder methods for WASI contexts onw use `&mut self` instead of `self` .
[#6770 ](https://github.com/bytecodealliance/wasmtime/pull/6770 )
* Native unwinding information is now properly disabled when it is configured to
be turned off.
[#6547 ](https://github.com/bytecodealliance/wasmtime/pull/6547 )
### Removed
* Wasmtime's experimental implementation of wasi-crypto has been removed. More
discussion of this change can be found on
[#6732 ](https://github.com/bytecodealliance/wasmtime/pull/6732 )
and
[#6816 ](https://github.com/bytecodealliance/wasmtime/pull/6816 )
* Support for `union` types in the component model has been removed.
[#6913 ](https://github.com/bytecodealliance/wasmtime/pull/6913 )
--------------------------------------------------------------------------------
## 12.0.1
Released 2023-08-24
### Fixed
* Optimized the cranelift compilation on aarch64 for large wasm modules.
[#6804 ](https://github.com/bytecodealliance/wasmtime/pull/6804 )
--------------------------------------------------------------------------------
## 12.0.0
Released 2023-08-21
### Added
* Wasmtime now supports having multiple different versions of itself being
linked into the same final executable by mangling some C symbols used by
Wasmtime.
[#6673 ](https://github.com/bytecodealliance/wasmtime/pull/6673 )
* The `perfmap` profiling option is now supported on any Unix platform instead
of just Linux.
[#6701 ](https://github.com/bytecodealliance/wasmtime/pull/6701 )
* The `wasmtime` CLI now supports `--env FOO` to inherit the value of the
environment variable `FOO` which avoids needing to do `--env FOO=$FOO` for
example.
[#6746 ](https://github.com/bytecodealliance/wasmtime/pull/6746 )
* Wasmtime now supports component model resources, although support has not yet
been added to `bindgen!` .
[#6691 ](https://github.com/bytecodealliance/wasmtime/pull/6691 )
* Wasmtime now supports configuration to enable the tail calls proposal.
Platform support now also includes AArch64 and RISC-V in addition to the
previous x86\_64 support.
[#6723 ](https://github.com/bytecodealliance/wasmtime/pull/6723 )
[#6749 ](https://github.com/bytecodealliance/wasmtime/pull/6749 )
[#6774 ](https://github.com/bytecodealliance/wasmtime/pull/6774 )
* Wasmtime's implementation of WASI Preview 2 now supports streams/pollables
with host objects that are all backed by Rust `async` .
[#6556 ](https://github.com/bytecodealliance/wasmtime/pull/6556 )
* Support for core dumps has now been added to the `wasmtime` crate.
[#6513 ](https://github.com/bytecodealliance/wasmtime/pull/6513 )
* New `{Module,Component}::resources_required` APIs allow inspecting what will
be required when instantiating the module or component.
[#6789 ](https://github.com/bytecodealliance/wasmtime/pull/6789 )
### Fixed
* Functions on instances defined through `component::Linker::func_new` are now
defined correctly.
[#6637 ](https://github.com/bytecodealliance/wasmtime/pull/6637 )
* The `async_stack_size` configuration option is no longer inspected when
`async_support` is disabled at runtime.
[#6771 ](https://github.com/bytecodealliance/wasmtime/pull/6771 )
* WASI Preview 1 APIs will now trap on misaligned or out-of-bounds pointers
instead of returning an error.
[#6776 ](https://github.com/bytecodealliance/wasmtime/pull/6776 )
### Changed
* Empty types are no longer allowed in the component model.
[#6777 ](https://github.com/bytecodealliance/wasmtime/pull/6777 )
--------------------------------------------------------------------------------
## 11.0.0
Released 2023-07-20
### Changed
* The WASI Preview 2 `WasiCtxBuilder` type has been refactored, and `WasiCtx` now has private
fields.
[#6652 ](https://github.com/bytecodealliance/wasmtime/pull/6652 )
* Component `bindgen!` now generates owned types by default instead of based on
how they're used
[#6648 ](https://github.com/bytecodealliance/wasmtime/pull/6648 )
* Wasmtime/Cranelift on x86-64 can now execute Wasm-SIMD on baseline SSE2, which
all x86-64 processors support (as part of the base x86-64 spec). Previously,
SSE4.2 extensions were required. This new work allows Wasm with SIMD
extensions to execute on processors produced back to 2003.
[#6625 ](https://github.com/bytecodealliance/wasmtime/pull/6625 )
### Fixed
* Only export the top-level preview2 module from wasmtime-wasi when the
`preview2` feature is enabled.
[#6615 ](https://github.com/bytecodealliance/wasmtime/pull/6615 )
### Cranelift changes
* Tail call implementation has begun in Cranelift
[#6641 ](https://github.com/bytecodealliance/wasmtime/pull/6641 )
[#6666 ](https://github.com/bytecodealliance/wasmtime/pull/6666 )
[#6650 ](https://github.com/bytecodealliance/wasmtime/pull/6650 )
[#6635 ](https://github.com/bytecodealliance/wasmtime/pull/6635 )
[#6608 ](https://github.com/bytecodealliance/wasmtime/pull/6608 )
[#6586 ](https://github.com/bytecodealliance/wasmtime/pull/6586 )
* Work continues on SIMD support for the riscv64 backend
[#6657 ](https://github.com/bytecodealliance/wasmtime/pull/6657 )
[#6643 ](https://github.com/bytecodealliance/wasmtime/pull/6643 )
[#6601 ](https://github.com/bytecodealliance/wasmtime/pull/6601 )
[#6609 ](https://github.com/bytecodealliance/wasmtime/pull/6609 )
[#6602 ](https://github.com/bytecodealliance/wasmtime/pull/6602 )
[#6598 ](https://github.com/bytecodealliance/wasmtime/pull/6598 )
[#6599 ](https://github.com/bytecodealliance/wasmtime/pull/6599 )
[#6587 ](https://github.com/bytecodealliance/wasmtime/pull/6587 )
[#6568 ](https://github.com/bytecodealliance/wasmtime/pull/6568 )
[#6515 ](https://github.com/bytecodealliance/wasmtime/pull/6515 )
* Fix `AuthenticatedRet` when stack bytes are popped in the aarch64 backend
[#6634 ](https://github.com/bytecodealliance/wasmtime/pull/6634 )
* The `fcvt_low_from_sint` instruction has been removed, as it its current
behavior can be recovered through a combination of `swiden_low` and
`fcvt_from_sint`
[#6565 ](https://github.com/bytecodealliance/wasmtime/pull/6565 )
--------------------------------------------------------------------------------
## 10.0.1
Released 2023-06-21
### Fixed
* Only export the top-level preview2 module from wasmtime-wasi when the
`preview2` feature is enabled.
[#6615 ](https://github.com/bytecodealliance/wasmtime/pull/6615 )
--------------------------------------------------------------------------------
## 10.0.0
Released 2023-06-20
### Added
* Expose the `Config::static_memory_forced` option through the C api
[#6413 ](https://github.com/bytecodealliance/wasmtime/pull/6413 )
* Basic guest-profiler documentation for the book
[#6394 ](https://github.com/bytecodealliance/wasmtime/pull/6394 )
* Merge the initial wasi-preview2 implementation
[#6391 ](https://github.com/bytecodealliance/wasmtime/pull/6391 )
* The wasi-preview2 component adapter has been pulled into the main wasmtime
repository. It is available for the first time as part of this release, but should be
treated as as a beta at this time. Patch releases will not be made for bug fixes.
[#6374 ](https://github.com/bytecodealliance/wasmtime/pull/6374 )
* A callback invoked when an epoch deadline is reached can now be configured via
the C API.
[#6359 ](https://github.com/bytecodealliance/wasmtime/pull/6359 )
* PR auto-assignment policies have been documented, to clarify the expectations of
reviewers.
[#6346 ](https://github.com/bytecodealliance/wasmtime/pull/6346 )
* Support for the function references has been added
[#5288 ](https://github.com/bytecodealliance/wasmtime/pull/5288 )
### Changed
* An `epoch_deadline_callback` now returns an `UpdateDeadline` enum to allow
optionally yielding to the async executor after the callback runs.
[#6464 ](https://github.com/bytecodealliance/wasmtime/pull/6464 )
* The `--profile-guest` flag has now been folded into `--profile=guest`
[#6352 ](https://github.com/bytecodealliance/wasmtime/pull/6352 )
* Initializers are no longer tracked in the type information for globals, and
instead are provided when creating the global.
[#6349 ](https://github.com/bytecodealliance/wasmtime/pull/6349 )
* The "raw" representation of `funcref` and `externref` in the embedding API has
been updated from a `usize` to a `*mut u8` to be compatible with Rust's
proposed strict provenance rules. This change is additionally reflected into
the C API as well.
[#6338 ](https://github.com/bytecodealliance/wasmtime/pull/6338 )
### Fixed
* Fixed a soundness issue with the component model and async
[#6509 ](https://github.com/bytecodealliance/wasmtime/pull/6509 )
* Opening directories with WASI on Windows with `NONBLOCK` in flags has been
fixed.
[#6348 ](https://github.com/bytecodealliance/wasmtime/pull/6348 )
### Cranelift changes
* Performance improvements in regalloc2 have landed, and compilation time has
improved
[#6483 ](https://github.com/bytecodealliance/wasmtime/pull/6483 )
[#6398 ](https://github.com/bytecodealliance/wasmtime/pull/6398 )
* Renamed `abi::Caller` to `abi::CallSite`
[#6414 ](https://github.com/bytecodealliance/wasmtime/pull/6414 )
* Work has begun on SIMD support for the riscv64 backend
[#6324 ](https://github.com/bytecodealliance/wasmtime/pull/6324 )
[#6366 ](https://github.com/bytecodealliance/wasmtime/pull/6366 )
[#6367 ](https://github.com/bytecodealliance/wasmtime/pull/6367 )
[#6392 ](https://github.com/bytecodealliance/wasmtime/pull/6392 )
[#6397 ](https://github.com/bytecodealliance/wasmtime/pull/6397 )
[#6403 ](https://github.com/bytecodealliance/wasmtime/pull/6403 )
[#6408 ](https://github.com/bytecodealliance/wasmtime/pull/6408 )
[#6419 ](https://github.com/bytecodealliance/wasmtime/pull/6419 )
[#6430 ](https://github.com/bytecodealliance/wasmtime/pull/6430 )
[#6507 ](https://github.com/bytecodealliance/wasmtime/pull/6507 )
--------------------------------------------------------------------------------
## 9.0.3
Released 2023-05-31.
### Fixed
* Fix Wasi rights system to work with wasi-testsuite, which exposed a corner case
that was missed by the fixes in the 9.0.2 release.
[#6479 ](https://github.com/bytecodealliance/wasmtime/pull/6479 )
--------------------------------------------------------------------------------
## 9.0.2
Released 2023-05-26.
### Fixed
* Fix Wasi rights system to work with wasi-libc. This regression was
introduced in the 9.0.0 release.
[#6462 ](https://github.com/bytecodealliance/wasmtime/pull/6462 )
[#6471 ](https://github.com/bytecodealliance/wasmtime/pull/6471 )
--------------------------------------------------------------------------------
## 9.0.1
Released 2023-05-22.
### Fixed
* A panic which happened when enabling support for native platform profilers was
fixed.
[#6435 ](https://github.com/bytecodealliance/wasmtime/pull/6435 )
--------------------------------------------------------------------------------
## 9.0.0
Released 2023-05-22.
### Added
* Initial integration of the Winch baseline compiler into Wasmtime is
implemented. Note that Winch still does not support much of WebAssembly, but
intrepid explorers may have an easier time playing around with it now.
[#6119 ](https://github.com/bytecodealliance/wasmtime/pull/6119 )
* The `wasmtime` CLI now has flags to limit memory, instances, and tables. For
example `--max-memory-size` or `--max-tables` . Additionally it has a new
`--trap-on-grow-failure` option to force a trap whenever a `memory.grow` would
otherwise fail which can be useful for debugging modules which may be
encountering OOM.
[#6149 ](https://github.com/bytecodealliance/wasmtime/pull/6149 )
* An initial implementation of the wasi-http proposal was added to Wasmtime in
the shape of a new `wasmtime-wasi-http` crate and a
`--wasi-modules=experimental-wasi-http` CLI flag. Note that this is not
on-by-default and still in an experimental status at this time.
[#5929 ](https://github.com/bytecodealliance/wasmtime/pull/5929 )
* Wasmtime's `bindgen!` macro for components now has `interfaces` and
`with` options to configure use of interfaces defined externally in separate
crates.
[#6160 ](https://github.com/bytecodealliance/wasmtime/pull/6160 )
[#6210 ](https://github.com/bytecodealliance/wasmtime/pull/6210 )
* Wasmtime's `bindgen!` macro emits trace events for arguments and results
when enabled.
[#6209 ](https://github.com/bytecodealliance/wasmtime/pull/6209 )
* A new `Engine::precompile_compatibility_hash` method has been added to assist
with hashing artifacts to be compatible with versions of Wasmtime.
[#5826 ](https://github.com/bytecodealliance/wasmtime/pull/5826 )
* Wasmtime's C API now has functions for enabling the WebAssembly relaxed-simd
proposal.
[#6292 ](https://github.com/bytecodealliance/wasmtime/pull/6292 )
* A new `--emit-clif` flag has been added to `wasmtime compile` to see the CLIF
corresponding to a WebAssembly module to be used for debugging.
[#6307 ](https://github.com/bytecodealliance/wasmtime/pull/6307 )
* Support for an in-process sampling-based profiler has been added to Wasmtime.
This is intended to be used in conjunction with epochs to enable relatively
simple implementations of profiling a guest module.
[#6282 ](https://github.com/bytecodealliance/wasmtime/pull/6282 )
### Changed
wasmtime: Overhaul trampolines (#6262)
This commit splits `VMCallerCheckedFuncRef::func_ptr` into three new function
pointers: `VMCallerCheckedFuncRef::{wasm,array,native}_call`. Each one has a
dedicated calling convention, so callers just choose the version that works for
them. This is as opposed to the previous behavior where we would chain together
many trampolines that converted between calling conventions, sometimes up to
four on the way into Wasm and four more on the way back out. See [0] for
details.
[0] https://github.com/bytecodealliance/rfcs/blob/main/accepted/tail-calls.md#a-review-of-our-existing-trampolines-calling-conventions-and-call-paths
Thanks to @bjorn3 for the initial idea of having multiple function pointers for
different calling conventions.
This is generally a nice ~5-10% speed up to our call benchmarks across the
board: both Wasm-to-host and host-to-Wasm. The one exception is typed calls from
Wasm to the host, which have a minor regression. We hypothesize that this is
because the old hand-written assembly trampolines did not maintain a call frame
and do a tail call, but the new Cranelift-generated trampolines do maintain a
call frame and do a regular call. The regression is only a couple nanoseconds,
which seems well-explained by these differences explain, and ultimately is not a
big deal.
However, this does lead to a ~5% code size regression for compiled modules.
Before, we compiled a trampoline per escaping function's signature and we
deduplicated these trampolines by signature. Now we compile two trampolines per
escaping function: one for if the host calls via the array calling convention
and one for it the host calls via the native calling convention. Additionally,
we compile a trampoline for every type in the module, in case there is a native
calling convention function from the host that we `call_indirect` of that
type. Much of this is in the `.eh_frame` section in the compiled module, because
each of our trampolines needs an entry there. Note that the `.eh_frame` section
is not required for Wasmtime's correctness, and you can disable its generation
to shrink compiled module code size; we just emit it to play nice with external
unwinders and profilers. We believe there are code size gains available for
follow up work to offset this code size regression in the future.
Backing up a bit: the reason each Wasm module needs to provide these
Wasm-to-native trampolines is because `wasmtime::Func::wrap` and friends allow
embedders to create functions even when there is no compiler available, so they
cannot bring their own trampoline. Instead the Wasm module has to supply
it. This in turn means that we need to look up and patch in these Wasm-to-native
trampolines during roughly instantiation time. But instantiation is super hot,
and we don't want to add more passes over imports or any extra work on this
path. So we integrate with `wasmtime::InstancePre` to patch these trampolines in
ahead of time.
Co-Authored-By: Jamey Sharp <jsharp@fastly.com>
Co-Authored-By: Alex Crichton <alex@alexcrichton.com>
prtest:full
2 years ago
* Overhauled the way that Wasmtime calls into Wasm and Wasm calls back out to
the host. Instead of chaining together trampolines to convert between calling
conventions, we now represent `funcref` s with multiple function pointers, one
per calling convention. This paves the way for supporting Wasm tail calls and
also results in ~10% speed ups to a variety of function call benchmarks,
however there are some slight compiled Wasm module code size regressions
(which can be alleviated by disabling optional `.eh_frame`
generation). Additionally, in the C API the `wasmtime_func_call_unchecked`
function gained one more parameter, which is the capacity of the
args-and-results
buffer.
[#6262 ](https://github.com/bytecodealliance/wasmtime/pull/6262 )
* The `wasmtime compile` command will now default to producing executables for
the native host and its CPU features instead of the baseline feature set of
the host's architecture.
[#6152 ](https://github.com/bytecodealliance/wasmtime/pull/6152 )
* The `ResourceLimiter` trait and its `async` equivalent now support returning
errors from growth to force a trap in the wasm module rather than reporting
-1 to the wasm module. Note that this is primarily intended for debugging.
[#6149 ](https://github.com/bytecodealliance/wasmtime/pull/6149 )
* The non-egraph-based optimization pipeline has been removed from Cranelift,
and the corresponding `Config::use_egraphs` option is also removed.
[#6167 ](https://github.com/bytecodealliance/wasmtime/pull/6167 )
* Generated types for WIT files now always generates owned types by default.
[#6189 ](https://github.com/bytecodealliance/wasmtime/pull/6189 )
* Wasmtime's baseline x86\_64 CPU features required for SIMD support has been
lowered from SSE 4.2 to SSE 4.1.
[#6206 ](https://github.com/bytecodealliance/wasmtime/pull/6206 )
* The `fd_allocate` implementation in Wasmtime will now always fail with
`ENOTSUP` .
[#6217 ](https://github.com/bytecodealliance/wasmtime/pull/6217 )
* The "rights" system in WASI has been removed and rights are no longer
inspected in the implementation of any WASI functions.
[#6265 ](https://github.com/bytecodealliance/wasmtime/pull/6265 )
### Fixed
* WASI can now open directories without `O_DIRECTORY` .
[#6163 ](https://github.com/bytecodealliance/wasmtime/pull/6163 )
* The `poll_oneoff` function has been fixed when handling non-regular files.
[#6258 ](https://github.com/bytecodealliance/wasmtime/pull/6258 )
* The behavior of `path_readlink` on too-small buffers has been fixed to
truncate.
[#6225 ](https://github.com/bytecodealliance/wasmtime/pull/6225 )
### Cranelift changes
> Note: this section documents changes to Cranelift, a code generator backend
> that Wasmtime uses. These changes are not always applicable to Wasmtime as a
> WebAssembly runtime but may be interesting to other projects which embed or
> use Cranelift.
* New `{u,s}{add,sub,mul}_overflow` instructions have been added.
[#5784 ](https://github.com/bytecodealliance/wasmtime/pull/5784 )
* The `iadd_cout` and `isub_bout` instructions have been removed.
[#6198 ](https://github.com/bytecodealliance/wasmtime/pull/6198 )
* ISLE now supports binary and octal integer literals.
[#6234 ](https://github.com/bytecodealliance/wasmtime/pull/6234 )
* An implementation of SIMD for RISC-V has started.
[#6240 ](https://github.com/bytecodealliance/wasmtime/pull/6240 )
[#6266 ](https://github.com/bytecodealliance/wasmtime/pull/6266 )
[#6268 ](https://github.com/bytecodealliance/wasmtime/pull/6268 )
wasmtime: Overhaul trampolines (#6262)
This commit splits `VMCallerCheckedFuncRef::func_ptr` into three new function
pointers: `VMCallerCheckedFuncRef::{wasm,array,native}_call`. Each one has a
dedicated calling convention, so callers just choose the version that works for
them. This is as opposed to the previous behavior where we would chain together
many trampolines that converted between calling conventions, sometimes up to
four on the way into Wasm and four more on the way back out. See [0] for
details.
[0] https://github.com/bytecodealliance/rfcs/blob/main/accepted/tail-calls.md#a-review-of-our-existing-trampolines-calling-conventions-and-call-paths
Thanks to @bjorn3 for the initial idea of having multiple function pointers for
different calling conventions.
This is generally a nice ~5-10% speed up to our call benchmarks across the
board: both Wasm-to-host and host-to-Wasm. The one exception is typed calls from
Wasm to the host, which have a minor regression. We hypothesize that this is
because the old hand-written assembly trampolines did not maintain a call frame
and do a tail call, but the new Cranelift-generated trampolines do maintain a
call frame and do a regular call. The regression is only a couple nanoseconds,
which seems well-explained by these differences explain, and ultimately is not a
big deal.
However, this does lead to a ~5% code size regression for compiled modules.
Before, we compiled a trampoline per escaping function's signature and we
deduplicated these trampolines by signature. Now we compile two trampolines per
escaping function: one for if the host calls via the array calling convention
and one for it the host calls via the native calling convention. Additionally,
we compile a trampoline for every type in the module, in case there is a native
calling convention function from the host that we `call_indirect` of that
type. Much of this is in the `.eh_frame` section in the compiled module, because
each of our trampolines needs an entry there. Note that the `.eh_frame` section
is not required for Wasmtime's correctness, and you can disable its generation
to shrink compiled module code size; we just emit it to play nice with external
unwinders and profilers. We believe there are code size gains available for
follow up work to offset this code size regression in the future.
Backing up a bit: the reason each Wasm module needs to provide these
Wasm-to-native trampolines is because `wasmtime::Func::wrap` and friends allow
embedders to create functions even when there is no compiler available, so they
cannot bring their own trampoline. Instead the Wasm module has to supply
it. This in turn means that we need to look up and patch in these Wasm-to-native
trampolines during roughly instantiation time. But instantiation is super hot,
and we don't want to add more passes over imports or any extra work on this
path. So we integrate with `wasmtime::InstancePre` to patch these trampolines in
ahead of time.
Co-Authored-By: Jamey Sharp <jsharp@fastly.com>
Co-Authored-By: Alex Crichton <alex@alexcrichton.com>
prtest:full
2 years ago
--------------------------------------------------------------------------------
## 8.0.1
Released 2023-04-27.
### Changed
* Breaking: Files opened using Wasmtime's implementation of WASI on Windows now
cannot be deleted until the file handle is closed. This was already true for
open directories. The change was necessary for the bug fix in
[#6163 ](https://github.com/bytecodealliance/wasmtime/pull/6163 ).
### Fixed
* Fixed wasi-common's implementation of the `O_DIRECTORY` flag to match POSIX.
[#6163 ](https://github.com/bytecodealliance/wasmtime/pull/6163 )
* Undefined Behavior in Rust runtime functions
[GHSA-ch89-5g45-qwc7 ](https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-ch89-5g45-qwc7 )
--------------------------------------------------------------------------------
## 8.0.0
Released 2023-04-20
### Added
* Allow the MPL-2.0 and OpenSSL licenses in dependencies of wasmtime.
[#6136 ](https://github.com/bytecodealliance/wasmtime/pull/6136 )
* Add a bounds-checking optimization for dynamic memories and guard pages.
[#6031 ](https://github.com/bytecodealliance/wasmtime/pull/6031 )
* Add support for generating perf maps for simple perf profiling. Additionally,
the `--jitdump` and `--vtune` flags have been replaced with a single
`--profile` flags that accepts `perfmap` , `jitdump` , and `vtune` arguments.
[#6030 ](https://github.com/bytecodealliance/wasmtime/pull/6030 )
* Validate faulting addresses are valid to fault on. As a mitigation to CVEs
like `GHSA-ff4p-7xrq-q5r8` , check that the address involved in a fault is one
that could be contained in a `Store` , or print a scary message and abort
immediately.
[#6028 ](https://github.com/bytecodealliance/wasmtime/pull/6028 )
* Add the `--default-values-unknown-imports` option to define unknown function
imports as functions that return the default value for their result type.
[#6010 ](https://github.com/bytecodealliance/wasmtime/pull/6010 )
* Add `Clone` for `component::InstancePre` .
[#5996 ](https://github.com/bytecodealliance/wasmtime/issues/5996 )
* Add `--dynamic-memory-reserved-for-growth` cli flag.
[#5980 ](https://github.com/bytecodealliance/wasmtime/issues/5980 )
* Introduce the `wasmtime-explorer` crate for investigating the compilation of
wasm modules. This functionality is also exposed via the `wasmtime explore`
command.
[#5975 ](https://github.com/bytecodealliance/wasmtime/pull/5975 )
* Added support for the Relaxed SIMD proposal.
[#5892 ](https://github.com/bytecodealliance/wasmtime/pull/5892 )
* Cranelift gained many new machine-independent optimizations.
[#5909 ](https://github.com/bytecodealliance/wasmtime/pull/5909 )
[#6032 ](https://github.com/bytecodealliance/wasmtime/pull/6032 )
[#6033 ](https://github.com/bytecodealliance/wasmtime/pull/6033 )
[#6034 ](https://github.com/bytecodealliance/wasmtime/pull/6034 )
[#6037 ](https://github.com/bytecodealliance/wasmtime/pull/6037 )
[#6052 ](https://github.com/bytecodealliance/wasmtime/pull/6052 )
[#6053 ](https://github.com/bytecodealliance/wasmtime/pull/6053 )
[#6072 ](https://github.com/bytecodealliance/wasmtime/pull/6072 )
[#6095 ](https://github.com/bytecodealliance/wasmtime/pull/6095 )
[#6130 ](https://github.com/bytecodealliance/wasmtime/pull/6130 )
### Changed
* Derive `Copy` on `wasmtime::ValType` .
[#6138 ](https://github.com/bytecodealliance/wasmtime/pull/6138 )
* Make `StoreContextMut` accessible in the epoch deadline callback.
[#6075 ](https://github.com/bytecodealliance/wasmtime/pull/6075 )
* Take SIGFPE signals for divide traps on `x86_64` .
[#6026 ](https://github.com/bytecodealliance/wasmtime/pull/6026 )
* Use more specialized AVX instructions in the `x86_64` backend.
[#5924 ](https://github.com/bytecodealliance/wasmtime/pull/5924 )
[#5930 ](https://github.com/bytecodealliance/wasmtime/pull/5930 )
[#5931 ](https://github.com/bytecodealliance/wasmtime/pull/5931 )
[#5982 ](https://github.com/bytecodealliance/wasmtime/pull/5982 )
[#5986 ](https://github.com/bytecodealliance/wasmtime/pull/5986 )
[#5999 ](https://github.com/bytecodealliance/wasmtime/pull/5999 )
[#6023 ](https://github.com/bytecodealliance/wasmtime/pull/6023 )
[#6025 ](https://github.com/bytecodealliance/wasmtime/pull/6025 )
[#6060 ](https://github.com/bytecodealliance/wasmtime/pull/6060 )
[#6086 ](https://github.com/bytecodealliance/wasmtime/pull/6086 )
[#6092 ](https://github.com/bytecodealliance/wasmtime/pull/6092 )
* Generate more cache-friendly code for traps.
[#6011 ](https://github.com/bytecodealliance/wasmtime/pull/6011 )
### Fixed
* Fixed suboptimal code generation in the `aarch64` backend.
[#5976 ](https://github.com/bytecodealliance/wasmtime/pull/5976 )
[#5977 ](https://github.com/bytecodealliance/wasmtime/pull/5977 )
[#5987 ](https://github.com/bytecodealliance/wasmtime/pull/5987 )
[#5997 ](https://github.com/bytecodealliance/wasmtime/pull/5997 )
[#6078 ](https://github.com/bytecodealliance/wasmtime/pull/6078 )
* Fixed suboptimal code generation in the `riscv64` backend.
[#5854 ](https://github.com/bytecodealliance/wasmtime/pull/5854 )
[#5857 ](https://github.com/bytecodealliance/wasmtime/pull/5857 )
[#5919 ](https://github.com/bytecodealliance/wasmtime/pull/5919 )
[#5951 ](https://github.com/bytecodealliance/wasmtime/pull/5951 )
[#5964 ](https://github.com/bytecodealliance/wasmtime/pull/5964 )
[#6087 ](https://github.com/bytecodealliance/wasmtime/pull/6087 )
--------------------------------------------------------------------------------
## 7.0.1
Released 2023-04-27.
### Fixed
* Undefined Behavior in Rust runtime functions
[GHSA-ch89-5g45-qwc7 ](https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-ch89-5g45-qwc7 )
--------------------------------------------------------------------------------
## 7.0.0
Released 2023-03-20
### Added
* An initial implementation of the wasi-threads proposal has been implemented
and landed in the Wasmtime CLI. This is available behind a
`--wasi-modules experimental-wasi-threads` flag.
[#5484 ](https://github.com/bytecodealliance/wasmtime/pull/5484 )
* Support for WASI sockets has been added to the C API.
[#5624 ](https://github.com/bytecodealliance/wasmtime/pull/5624 )
* Support for limiting `Store` -based resource usage, such as memory, tables,
etc, has been added to the C API.
[#5761 ](https://github.com/bytecodealliance/wasmtime/pull/5761 )
* A top level alias of `anyhow::Result` as `wasmtime::Result` has been added to
avoid the need to explicitly depend on `anyhow` .
[#5853 ](https://github.com/bytecodealliance/wasmtime/pull/5853 )
* Initial support for the WebAssembly core dump format has been added to the CLI
with a `--coredump-on-trap` flag.
[#5868 ](https://github.com/bytecodealliance/wasmtime/pull/5868 )
### Changed
* The `S` type parameter on component-related methods has been removed.
[#5722 ](https://github.com/bytecodealliance/wasmtime/pull/5722 )
* Selection of a `world` to bindgen has been updated to select any `default
world` in a WIT package if there is only one.
[#5779 ](https://github.com/bytecodealliance/wasmtime/pull/5779 )
* WASI preopened file descriptors can now be closed.
[#5828 ](https://github.com/bytecodealliance/wasmtime/pull/5828 )
* The host traits generated by the `bindgen!` macro are now always named `Host` ,
but are still scoped to each individual module.
[#5890 ](https://github.com/bytecodealliance/wasmtime/pull/5890 )
### Fixed
* Components which have `type` imports are now supported better and error/panic
in fewer cases.
[#5777 ](https://github.com/bytecodealliance/wasmtime/pull/5777 )
* Types referred to by `wasmtime::component::Val` are now reexported under
`wasmtime::component` .
[#5790 ](https://github.com/bytecodealliance/wasmtime/pull/5790 )
* A panic due to a race between `memory.atomic.{wait32,wait64,notify}`
instructions has been fixed.
[#5871 ](https://github.com/bytecodealliance/wasmtime/pull/5871 )
* Guest-controlled out-of-bounds read/write on x86\_64
[GHSA-ff4p-7xrq-q5r8 ](https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-ff4p-7xrq-q5r8 )
* Miscompilation of `i8x16.select` with the same inputs on x86\_64
[GHSA-xm67-587q-r2vw ](https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-xm67-587q-r2vw )
--------------------------------------------------------------------------------
## 6.0.2
Released 2023-04-27.
### Fixed
* Undefined Behavior in Rust runtime functions
[GHSA-ch89-5g45-qwc7 ](https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-ch89-5g45-qwc7 )
--------------------------------------------------------------------------------
## 6.0.1
Released 2023-03-08.
### Fixed
* Guest-controlled out-of-bounds read/write on x86\_64
[GHSA-ff4p-7xrq-q5r8 ](https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-ff4p-7xrq-q5r8 )
* Miscompilation of `i8x16.select` with the same inputs on x86\_64
[GHSA-xm67-587q-r2vw ](https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-xm67-587q-r2vw )
--------------------------------------------------------------------------------
## 6.0.0
Released 2023-02-20
### Added
* Wasmtime's built-in cache can now be disabled after being enabled previously.
[#5542 ](https://github.com/bytecodealliance/wasmtime/pull/5542 )
* Older x86\_64 CPUs, without SSE4.1 for example, are now supported when the
wasm SIMD proposal is disabled.
[#5567 ](https://github.com/bytecodealliance/wasmtime/pull/5567 )
* The Wasmtime C API now has `WASMTIME_VERSION_*` macros defined in its header
files.
[#5651 ](https://github.com/bytecodealliance/wasmtime/pull/5651 )
* The `wasmtime` CLI executable as part of Wasmtime's precompiled release
artifacts now has the `all-arch` feature enabled.
[#5657 ](https://github.com/bytecodealliance/wasmtime/pull/5657 )
### Changed
* Equality of `wasmtime::component::Val::Float{32,64}` now considers NaNs as
equal for assistance when fuzzing.
[#5535 ](https://github.com/bytecodealliance/wasmtime/pull/5535 )
* WIT syntax supported by `wasmtime::component::bindgen!` has been updated in
addition to the generated code being updated.
[#5565 ](https://github.com/bytecodealliance/wasmtime/pull/5565 )
[#5692 ](https://github.com/bytecodealliance/wasmtime/pull/5692 )
[#5694 ](https://github.com/bytecodealliance/wasmtime/pull/5694 )
* Cranelift's egraph-based optimization framework is now enabled by default.
[#5587 ](https://github.com/bytecodealliance/wasmtime/pull/5587 )
* The old `PoolingAllocationStrategy` type has been removed in favor of a more
flexible configuration via a new option
`PoolingAllocationConfig::max_unused_warm_slots` which is more flexible and
subsumes the previous use cases for each strategy.
[#5661 ](https://github.com/bytecodealliance/wasmtime/pull/5661 )
* Creation of `InstancePre` through `Linker::instantiate_pre` no longer requires
a `Store` to be provided. Instead a `Store` -related argument is now required
on `Linker::define` -style APIs instead.
[#5683 ](https://github.com/bytecodealliance/wasmtime/pull/5683 )
### Fixed
* Compilation for FreeBSD on x86\_64 and AArch64 has been fixed.
[#5606 ](https://github.com/bytecodealliance/wasmtime/pull/5606 )
--------------------------------------------------------------------------------
## 5.0.1
Released 2023-03-08.
### Fixed
* Guest-controlled out-of-bounds read/write on x86\_64
[GHSA-ff4p-7xrq-q5r8 ](https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-ff4p-7xrq-q5r8 )
* Miscompilation of `i8x16.select` with the same inputs on x86\_64
[GHSA-xm67-587q-r2vw ](https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-xm67-587q-r2vw )
--------------------------------------------------------------------------------
## 5.0.0
Released 2023-01-20
### Added
* A `wasmtime::component::bingen!` macro has been added for generating bindings
from `*.wit` files. Note that WIT is still heavily in development so this is
more of a preview of what will be as opposed to a finished feature.
[#5317 ](https://github.com/bytecodealliance/wasmtime/pull/5317 )
[#5397 ](https://github.com/bytecodealliance/wasmtime/pull/5397 )
* The `wasmtime settings` CLI command now has a `--json` option for
machine-readable output.
[#5411 ](https://github.com/bytecodealliance/wasmtime/pull/5411 )
* Wiggle-generated bindings can now generate the trait for either `&mut self` or
`&self` .
[#5428 ](https://github.com/bytecodealliance/wasmtime/pull/5428 )
* The `wiggle` crate has more convenience APIs for working with guest data
that resides in shared memory.
[#5471 ](https://github.com/bytecodealliance/wasmtime/pull/5471 )
[#5475 ](https://github.com/bytecodealliance/wasmtime/pull/5475 )
### Changed
* Cranelift's egraph support has been rewritten and updated. This functionality
is still gated behind a flag and may become the default in the next release.
[#5382 ](https://github.com/bytecodealliance/wasmtime/pull/5382 )
* The implementation of codegen for WebAssembly linear memory has changed
significantly internally in Cranelift, moving more responsibility to the
Wasmtime embedding rather than Cranelift itself. This should have no
user-visible change, however.
[#5386 ](https://github.com/bytecodealliance/wasmtime/pull/5386 )
* The `Val::Float32` and `Val::Float64` variants for components now store `f32`
and `f64` instead of the bit representation.
[#5510 ](https://github.com/bytecodealliance/wasmtime/pull/5510 )
### Fixed
* Handling of DWARF debugging information in components with multiple modules
has been fixed to ensure the right info is used for each module.
[#5358 ](https://github.com/bytecodealliance/wasmtime/pull/5358 )
--------------------------------------------------------------------------------
## 4.0.1
Released 2023-03-08.
### Fixed
* Guest-controlled out-of-bounds read/write on x86\_64
[GHSA-ff4p-7xrq-q5r8 ](https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-ff4p-7xrq-q5r8 )
* Miscompilation of `i8x16.select` with the same inputs on x86\_64
[GHSA-xm67-587q-r2vw ](https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-xm67-587q-r2vw )
--------------------------------------------------------------------------------
## 4.0.0
Released 2022-12-20
### Added
* Dynamic memories are now supported with the pooling instance allocator which
can possibly reduce the number of page faults throughout execution at the cost
of slower to run code. Page faults are primarily reduced by avoiding
releasing memory back to the system, relying on bounds checks to keep the
memory inaccessible.
[#5208 ](https://github.com/bytecodealliance/wasmtime/pull/5208 )
* The `wiggle` generator now supports function-level control over `tracing`
calls.
[#5194 ](https://github.com/bytecodealliance/wasmtime/pull/5194 )
* Support has been added to `wiggle` to be compatible with shared memories.
[#5225 ](https://github.com/bytecodealliance/wasmtime/pull/5225 )
[#5229 ](https://github.com/bytecodealliance/wasmtime/pull/5229 )
[#5264 ](https://github.com/bytecodealliance/wasmtime/pull/5264 )
[#5268 ](https://github.com/bytecodealliance/wasmtime/pull/5268 )
[#5054 ](https://github.com/bytecodealliance/wasmtime/pull/5054 )
* The `wiggle` generator now supports a "trappable error" configuration to
improve error conversions to guest errors and ensure that no host errors are
forgotten or accidentally become traps. The `wasi-common` crate has been
updated to use this.
[#5276 ](https://github.com/bytecodealliance/wasmtime/pull/5276 )
[#5279 ](https://github.com/bytecodealliance/wasmtime/pull/5279 )
* The `memory.atomic.{notify,wait32,wait64}` instructions are now all
implemented in Wasmtime.
[#5255 ](https://github.com/bytecodealliance/wasmtime/pull/5255 )
[#5311 ](https://github.com/bytecodealliance/wasmtime/pull/5311 )
* A `wasm_config_parallel_compilation_set` configuration function has been added
to the C API.
[#5298 ](https://github.com/bytecodealliance/wasmtime/pull/5298 )
* The `wasmtime` CLI can have its input module piped into it from stdin now.
[#5342 ](https://github.com/bytecodealliance/wasmtime/pull/5342 )
* `WasmBacktrace::{capture,force_capture}` methods have been added to
programmatically capture a backtrace outside of a trapping context.
[#5341 ](https://github.com/bytecodealliance/wasmtime/pull/5341 )
### Changed
* The `S` type parameter on `Func::typed` and `Instance::get_typed_func` has
been removed and no longer needs to be specified.
[#5275 ](https://github.com/bytecodealliance/wasmtime/pull/5275 )
* The `SharedMemory::data` method now returns `&[UnsafeCell<u8>]` instead of the
prior raw slice return.
[#5240 ](https://github.com/bytecodealliance/wasmtime/pull/5240 )
* Creation of a `WasiCtx` will no longer unconditionally acquire randomness from
the OS, instead using the `rand::thread_rng()` function in Rust which is only
periodically reseeded with randomness from the OS.
[#5244 ](https://github.com/bytecodealliance/wasmtime/pull/5244 )
* Codegen of dynamically-bounds-checked wasm memory accesses has been improved.
[#5190 ](https://github.com/bytecodealliance/wasmtime/pull/5190 )
* Wasmtime will now emit inline stack probes in generated functions for x86\_64,
aarch64, and riscv64 architectures. This guarantees a process abort if an
engine was misconfigured to give wasm too much stack instead of optionally
allowing wasm to skip the guard page.
[#5350 ](https://github.com/bytecodealliance/wasmtime/pull/5350 )
[#5353 ](https://github.com/bytecodealliance/wasmtime/pull/5353 )
### Fixed
* Dropping a `Module` will now release kernel resources in-use by the pooling
allocator when enabled instead of waiting for a new instance to be
re-instantiated into prior slots.
[#5321 ](https://github.com/bytecodealliance/wasmtime/pull/5321 )
--------------------------------------------------------------------------------
## 3.0.1
Released 2022-12-01.
### Fixed
* The instruction cache is now flushed for AArch64 Android.
[#5331 ](https://github.com/bytecodealliance/wasmtime/pull/5331 )
* Building for FreeBSD and Android has been fixed.
[#5323 ](https://github.com/bytecodealliance/wasmtime/pull/5323 )
--------------------------------------------------------------------------------
## 3.0.0
Released 2022-11-21
### Added
* New `WasiCtx::{push_file, push_dir}` methods exist for embedders to add their
own objects.
[#5027 ](https://github.com/bytecodealliance/wasmtime/pull/5027 )
* Wasmtime's `component-model` support now supports `async` host functions and
embedding in the same manner as core wasm.
[#5055 ](https://github.com/bytecodealliance/wasmtime/pull/5055 )
* The `wasmtime` CLI executable now supports a `--max-wasm-stack` flag.
[#5156 ](https://github.com/bytecodealliance/wasmtime/pull/5156 )
* AOT compilation support has been implemented for components (aka the
`component-model` feature of the Wasmtime crate).
[#5160 ](https://github.com/bytecodealliance/wasmtime/pull/5160 )
* A new `wasi_config_set_stdin_bytes` function is available in the C API to set
the stdin of a WASI-using module from an in-memory slice.
[#5179 ](https://github.com/bytecodealliance/wasmtime/pull/5179 )
* When using the pooling allocator there are now options to reset memory with
`memset` instead of `madvisev` on Linux to keep pages resident in memory to
reduce page faults when reusing linear memory slots.
[#5207 ](https://github.com/bytecodealliance/wasmtime/pull/5207 )
### Changed
* Consuming 0 fuel with 0 fuel left is now considered to succeed. Additionally a
store may not consume its last unit of fuel.
[#5013 ](https://github.com/bytecodealliance/wasmtime/pull/5013 )
* A number of variants in the `wasi_common::ErrorKind` enum have been removed.
[#5015 ](https://github.com/bytecodealliance/wasmtime/pull/5015 )
* Methods on `WasiDir` now error-by-default instead of requiring a definition by
default.
[#5019 ](https://github.com/bytecodealliance/wasmtime/pull/5019 )
* Bindings generated by the `wiggle` crate now always depend on the `wasmtime`
crate meaning crates like `wasi-common` no longer compile for platforms such
as `wasm32-unknown-emscripten` .
[#5137 ](https://github.com/bytecodealliance/wasmtime/pull/5137 )
* Error handling in the `wasmtime` crate's API has been changed to primarily
work with `anyhow::Error` for custom errors. The `Trap` type has been replaced
with a simple `enum Trap { ... }` and backtrace information is now stored as a
`WasmBacktrace` type inserted as context into an `anyhow::Error` .
Host-functions are expected to return `anyhow::Result<T>` instead of the prior
`Trap` error return from before. Additionally the old `Trap::i32_exit`
constructor is now a concrete `wasi_commont::I32Exit` type which can be tested
for with a `downcast_ref` on the error returned from Wasmtime.
[#5149 ](https://github.com/bytecodealliance/wasmtime/pull/5149 )
* Configuration of the pooling allocator is now done through a builder-style
`PoolingAllocationConfig` API instead of the prior enum-variant API.
[#5205 ](https://github.com/bytecodealliance/wasmtime/pull/5205 )
### Fixed
* The instruction cache is now properly flushed for AArch64 on Windows.
[#4997 ](https://github.com/bytecodealliance/wasmtime/pull/4997 )
* Backtrace capturing with many sequences of wasm->host calls on the stack no
longer exhibit quadratic capturing behavior.
[#5049 ](https://github.com/bytecodealliance/wasmtime/pull/5049 )
--------------------------------------------------------------------------------
## 2.0.2
Released 2022-11-10.
### Fixed
* [CVE-2022-39392] - modules may perform out-of-bounds reads/writes when the
pooling allocator was configured with `memory_pages: 0` .
* [CVE-2022-39393] - data can be leaked between instances when using the pooling
allocator.
* [CVE-2022-39394] - An incorrect Rust signature for the C API
`wasmtime_trap_code` function could lead to an out-of-bounds write of three
zero bytes.
[CVE-2022-39392]: https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-44mr-8vmm-wjhg
[CVE-2022-39393]: https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-wh6w-3828-g9qf
[CVE-2022-39394]: https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-h84q-m8rr-3v9q
--------------------------------------------------------------------------------
## 2.0.1
Released 2022-10-27.
### Fixed
* A compilation error when building only the `wasmtime` crate on Windows with
only the default features enabled has been fixed.
[#5134 ](https://github.com/bytecodealliance/wasmtime/pull/5134 )
### Changed
* The `rayon` dependency added to `cranelift-isle` in 2.0.0 has been removed to
improve the compile time of the `cranelift-codegen` crate.
[#5101 ](https://github.com/bytecodealliance/wasmtime/pull/5101 )
--------------------------------------------------------------------------------
## 2.0.0
Released 2022-10-20
### Added
* Cranelift has gained support for forward-edge CFI on the AArch64 backend.
[#3693 ](https://github.com/bytecodealliance/wasmtime/pull/3693 )
* A `--disable-parallel-compilation` CLI flag is now implemented for `wasmtime` .
[#4911 ](https://github.com/bytecodealliance/wasmtime/pull/4911 )
* [Tier 3] support has been added for for RISC-V 64 with a new backend in
Cranelift for this architecture.
[#4271 ](https://github.com/bytecodealliance/wasmtime/pull/4271 )
* Basic [tier 3] support for Windows ARM64 has been added but features such as
traps don't work at this time.
[#4990 ](https://github.com/bytecodealliance/wasmtime/pull/4990 )
### Changed
* The implementation of the `random_get` function in `wasi-common` is now faster
by using a userspace CSPRNG rather than the OS for randomness.
[#4917 ](https://github.com/bytecodealliance/wasmtime/pull/4917 )
* The AArch64 backend has completed its transition to ISLE.
[#4851 ](https://github.com/bytecodealliance/wasmtime/pull/4851 )
[#4866 ](https://github.com/bytecodealliance/wasmtime/pull/4866 )
[#4898 ](https://github.com/bytecodealliance/wasmtime/pull/4898 )
[#4884 ](https://github.com/bytecodealliance/wasmtime/pull/4884 )
[#4820 ](https://github.com/bytecodealliance/wasmtime/pull/4820 )
[#4913 ](https://github.com/bytecodealliance/wasmtime/pull/4913 )
[#4942 ](https://github.com/bytecodealliance/wasmtime/pull/4942 )
[#4943 ](https://github.com/bytecodealliance/wasmtime/pull/4943 )
* The size of the `sigaltstack` allocated per-thread for signal handling has
been increased from 16k to 64k.
[#4964 ](https://github.com/bytecodealliance/wasmtime/pull/4964 )
[Tier 3]: https://docs.wasmtime.dev/stability-tiers.html
--------------------------------------------------------------------------------
## 1.0.2
Released 2022-11-10.
### Fixed
* [CVE-2022-39392] - modules may perform out-of-bounds reads/writes when the
pooling allocator was configured with `memory_pages: 0` .
* [CVE-2022-39393] - data can be leaked between instances when using the pooling
allocator.
* [CVE-2022-39394] - An incorrect Rust signature for the C API
`wasmtime_trap_code` function could lead to an out-of-bounds write of three
zero bytes.
--------------------------------------------------------------------------------
## 1.0.1
Released 2022-09-26
This is a patch release that incorporates a fix for a miscompilation of an
atomic-CAS operator on aarch64. The instruction is not usable from Wasmtime
with default settings, but may be used if the Wasm atomics extension is
enabled. The bug may also be reachable via other uses of Cranelift. Thanks to
@bjorn3 for reporting and debugging this issue!
### Fixed
* Fixed a miscompilation of `atomic_cas` on aarch64. The output register was
swapped with a temporary register in the register-allocator constraints.
[#4959 ](https://github.com/bytecodealliance/wasmtime/pull/4959 )
[#4960 ](https://github.com/bytecodealliance/wasmtime/pull/4960 )
--------------------------------------------------------------------------------
## 1.0.0
Released 2022-09-20
This release marks the official 1.0 release of Wasmtime and represents the
culmination of the work amongst over 300 contributors. Wasmtime has been
battle-tested in production through multiple embeddings for quite some time now
and we're confident in releasing a 1.0 version to signify the stability and
quality of the Wasmtime engine.
More information about Wasmtime's 1.0 release is on the [Bytecode Alliance's
blog][ba-blog] with separate posts on [Wasmtime's performance
features][ba-perf], [Wasmtime's security story][ba-security], and [the 1.0
release announcement][ba-1.0].
As a reminder the 2.0 release of Wasmtime is scheduled for one month from now on
October 20th. For more information see the [RFC on Wasmtime's 1.0
release][rfc-1.0].
[ba-blog]: https://bytecodealliance.org/articles/
[ba-perf]: https://bytecodealliance.org/articles/wasmtime-10-performance
[ba-security]: https://bytecodealliance.org/articles/security-and-correctness-in-wasmtime
[ba-1.0]: https://bytecodealliance.org/articles/wasmtime-1-0-fast-safe-and-now-production-ready.md
[rfc-1.0]: https://github.com/bytecodealliance/rfcs/blob/main/accepted/wasmtime-one-dot-oh.md
### Added
* An incremental compilation cache for Cranelift has been added which can be
enabled with `Config::enable_incremental_compilation` , and this option is
disabled by default for now. The incremental compilation cache has been
measured to improve compile times for cold uncached modules as well due to
some wasm modules having similar-enough functions internally.
[#4551 ](https://github.com/bytecodealliance/wasmtime/pull/4551 )
* Source tarballs are now available as part of Wasmtime's release artifacts.
[#4294 ](https://github.com/bytecodealliance/wasmtime/pull/4294 )
* WASI APIs that specify the REALTIME clock are now supported.
[#4777 ](https://github.com/bytecodealliance/wasmtime/pull/4777 )
* WASI's socket functions are now fully implemented.
[#4776 ](https://github.com/bytecodealliance/wasmtime/pull/4776 )
* The native call stack for async-executed wasm functions are no longer
automatically reset to zero after the stack is returned to the pool when using
the pooling allocator. A `Config::async_stack_zeroing` option has been added
to restore the old behavior of zero-on-return-to-pool.
[#4813 ](https://github.com/bytecodealliance/wasmtime/pull/4813 )
* Inline stack probing has been implemented for the Cranelift x64 backend.
[#4747 ](https://github.com/bytecodealliance/wasmtime/pull/4747 )
### Changed
* Generating of native unwind information has moved from a
`Config::wasm_backtrace` option to a new `Config::native_unwind_info` option
and is enabled by default.
[#4643 ](https://github.com/bytecodealliance/wasmtime/pull/4643 )
* The `memory-init-cow` feature is now enabled by default in the C API.
[#4690 ](https://github.com/bytecodealliance/wasmtime/pull/4690 )
* Back-edge CFI is now enabled by default on AArch64 macOS.
[#4720 ](https://github.com/bytecodealliance/wasmtime/pull/4720 )
* WASI calls will no longer return NOTCAPABLE in preparation for the removal of
the rights system from WASI.
[#4666 ](https://github.com/bytecodealliance/wasmtime/pull/4666 )
### Internal
This section of the release notes shouldn't affect external users since no
public-facing APIs are affected, but serves as a place to document larger
changes internally within Wasmtime.
* Differential fuzzing has been refactored and improved into one fuzzing target
which can execute against any of Wasmtime itself (configured differently),
wasmi, V8, or the spec interpreter. Fuzzing now executes each exported
function with fuzz-generated inputs and the contents of all of memory and each
exported global is compared after each execution. Additionally more
interesting shapes of modules are also possible to generate.
[#4515 ](https://github.com/bytecodealliance/wasmtime/pull/4515 )
[#4735 ](https://github.com/bytecodealliance/wasmtime/pull/4735 )
[#4737 ](https://github.com/bytecodealliance/wasmtime/pull/4737 )
[#4739 ](https://github.com/bytecodealliance/wasmtime/pull/4739 )
[#4774 ](https://github.com/bytecodealliance/wasmtime/pull/4774 )
[#4773 ](https://github.com/bytecodealliance/wasmtime/pull/4773 )
[#4845 ](https://github.com/bytecodealliance/wasmtime/pull/4845 )
[#4672 ](https://github.com/bytecodealliance/wasmtime/pull/4672 )
[#4674 ](https://github.com/bytecodealliance/wasmtime/pull/4674 )
* The x64 backend for Cranelift has been fully migrated to ISLE.
[#4619 ](https://github.com/bytecodealliance/wasmtime/pull/4619 )
[#4625 ](https://github.com/bytecodealliance/wasmtime/pull/4625 )
[#4645 ](https://github.com/bytecodealliance/wasmtime/pull/4645 )
[#4650 ](https://github.com/bytecodealliance/wasmtime/pull/4650 )
[#4684 ](https://github.com/bytecodealliance/wasmtime/pull/4684 )
[#4704 ](https://github.com/bytecodealliance/wasmtime/pull/4704 )
[#4718 ](https://github.com/bytecodealliance/wasmtime/pull/4718 )
[#4726 ](https://github.com/bytecodealliance/wasmtime/pull/4726 )
[#4722 ](https://github.com/bytecodealliance/wasmtime/pull/4722 )
[#4729 ](https://github.com/bytecodealliance/wasmtime/pull/4729 )
[#4730 ](https://github.com/bytecodealliance/wasmtime/pull/4730 )
[#4741 ](https://github.com/bytecodealliance/wasmtime/pull/4741 )
[#4763 ](https://github.com/bytecodealliance/wasmtime/pull/4763 )
[#4772 ](https://github.com/bytecodealliance/wasmtime/pull/4772 )
[#4780 ](https://github.com/bytecodealliance/wasmtime/pull/4780 )
[#4787 ](https://github.com/bytecodealliance/wasmtime/pull/4787 )
[#4793 ](https://github.com/bytecodealliance/wasmtime/pull/4793 )
[#4809 ](https://github.com/bytecodealliance/wasmtime/pull/4809 )
* The AArch64 backend for Cranelift has seen significant progress in being
ported to ISLE.
[#4608 ](https://github.com/bytecodealliance/wasmtime/pull/4608 )
[#4639 ](https://github.com/bytecodealliance/wasmtime/pull/4639 )
[#4634 ](https://github.com/bytecodealliance/wasmtime/pull/4634 )
[#4748 ](https://github.com/bytecodealliance/wasmtime/pull/4748 )
[#4750 ](https://github.com/bytecodealliance/wasmtime/pull/4750 )
[#4751 ](https://github.com/bytecodealliance/wasmtime/pull/4751 )
[#4753 ](https://github.com/bytecodealliance/wasmtime/pull/4753 )
[#4788 ](https://github.com/bytecodealliance/wasmtime/pull/4788 )
[#4796 ](https://github.com/bytecodealliance/wasmtime/pull/4796 )
[#4785 ](https://github.com/bytecodealliance/wasmtime/pull/4785 )
[#4819 ](https://github.com/bytecodealliance/wasmtime/pull/4819 )
[#4821 ](https://github.com/bytecodealliance/wasmtime/pull/4821 )
[#4832 ](https://github.com/bytecodealliance/wasmtime/pull/4832 )
* The s390x backend has seen improvements and additions to fully support the
Cranelift backend for rustc.
[#4682 ](https://github.com/bytecodealliance/wasmtime/pull/4682 )
[#4702 ](https://github.com/bytecodealliance/wasmtime/pull/4702 )
[#4616 ](https://github.com/bytecodealliance/wasmtime/pull/4616 )
[#4680 ](https://github.com/bytecodealliance/wasmtime/pull/4680 )
* Significant improvements have been made to Cranelift-based fuzzing with more
supported features and more instructions being fuzzed.
[#4589 ](https://github.com/bytecodealliance/wasmtime/pull/4589 )
[#4591 ](https://github.com/bytecodealliance/wasmtime/pull/4591 )
[#4665 ](https://github.com/bytecodealliance/wasmtime/pull/4665 )
[#4670 ](https://github.com/bytecodealliance/wasmtime/pull/4670 )
[#4590 ](https://github.com/bytecodealliance/wasmtime/pull/4590 )
[#4375 ](https://github.com/bytecodealliance/wasmtime/pull/4375 )
[#4519 ](https://github.com/bytecodealliance/wasmtime/pull/4519 )
[#4696 ](https://github.com/bytecodealliance/wasmtime/pull/4696 )
[#4700 ](https://github.com/bytecodealliance/wasmtime/pull/4700 )
[#4703 ](https://github.com/bytecodealliance/wasmtime/pull/4703 )
[#4602 ](https://github.com/bytecodealliance/wasmtime/pull/4602 )
[#4713 ](https://github.com/bytecodealliance/wasmtime/pull/4713 )
[#4738 ](https://github.com/bytecodealliance/wasmtime/pull/4738 )
[#4667 ](https://github.com/bytecodealliance/wasmtime/pull/4667 )
[#4782 ](https://github.com/bytecodealliance/wasmtime/pull/4782 )
[#4783 ](https://github.com/bytecodealliance/wasmtime/pull/4783 )
[#4800 ](https://github.com/bytecodealliance/wasmtime/pull/4800 )
* Optimization work on cranelift has continued across various dimensions for
some modest compile-time improvements.
[#4621 ](https://github.com/bytecodealliance/wasmtime/pull/4621 )
[#4701 ](https://github.com/bytecodealliance/wasmtime/pull/4701 )
[#4697 ](https://github.com/bytecodealliance/wasmtime/pull/4697 )
[#4711 ](https://github.com/bytecodealliance/wasmtime/pull/4711 )
[#4710 ](https://github.com/bytecodealliance/wasmtime/pull/4710 )
[#4829 ](https://github.com/bytecodealliance/wasmtime/pull/4829 )
--------------------------------------------------------------------------------
## 0.40.0
Released 2022-08-20
This was a relatively quiet release in terms of user-facing features where most
of the work was around the internals of Wasmtime and Cranelift. Improvements
internally have been made along the lines of:
* Many more instructions are now implemented with ISLE instead of handwritten
lowerings.
* Many improvements to the cranelift-based fuzzing.
* Many platform improvements for s390x including full SIMD support, running
`rustc_codegen_cranelift` with features like `i128` , supporting more
ABIs, etc.
* Much more of the component model has been implemented and is now fuzzed.
Finally this release is currently scheduled to be the last `0.*` release of
Wasmtime. The upcoming release of Wasmtime on September 20 is planned to be
Wasmtime's 1.0 release. More information about what 1.0 means for Wasmtime is
available in the [1.0 RFC]
[1.0 RFC]: https://github.com/bytecodealliance/rfcs/blob/main/accepted/wasmtime-one-dot-oh.md
### Added
* Stack walking has been reimplemented with frame pointers rather than with
native unwind information. This means that backtraces are feasible to capture
in performance-critical environments and in general stack walking is much
faster than before.
[#4431 ](https://github.com/bytecodealliance/wasmtime/pull/4431 )
* The WebAssembly `simd` proposal is now fully implemented for the s390x
backend.
[#4427 ](https://github.com/bytecodealliance/wasmtime/pull/4427 )
* Support for AArch64 has been added in the experimental native debuginfo
support that Wasmtime has.
[#4468 ](https://github.com/bytecodealliance/wasmtime/pull/4468 )
* Support building the C API of Wasmtime with CMake has been added.
[#4369 ](https://github.com/bytecodealliance/wasmtime/pull/4369 )
* Clarification was added to Wasmtime's documentation about "tiers of support"
for various features.
[#4479 ](https://github.com/bytecodealliance/wasmtime/pull/4479 )
### Fixed
* Support for `filestat_get` has been improved for stdio streams in WASI.
[#4531 ](https://github.com/bytecodealliance/wasmtime/pull/4531 )
* Enabling the `vtune` feature no longer breaks builds on AArch64.
[#4533 ](https://github.com/bytecodealliance/wasmtime/pull/4533 )
--------------------------------------------------------------------------------
## 0.39.1
Released 2022-07-20.
### Fixed
* An s390x-specific codegen bug in addition to a mistake introduced in the fix
of CVE-2022-31146 were fixed.
[#4490 ](https://github.com/bytecodealliance/wasmtime/pull/4490 )
--------------------------------------------------------------------------------
## 0.39.0
Released 2022-07-20
### Added
* Initial support for shared memories and the `threads` WebAssembly proposal
has been added. Note that this feature is still experimental and not ready
for production use yet.
[#4187 ](https://github.com/bytecodealliance/wasmtime/pull/4187 )
* A new `Linker::define_unknown_imports_as_traps` method and
`--trap-unknown-imports` CLI flag have been added to conveniently support
running modules with imports that aren't dynamically called at runtime.
[#4312 ](https://github.com/bytecodealliance/wasmtime/pull/4312 )
* The VTune profiling strategy can now be selected through the C API.
[#4316 ](https://github.com/bytecodealliance/wasmtime/pull/4316 )
### Changed
* Some methods on the `Config` structure now return `&mut Self` instead of
`Result<&mut Self>` since the validation is deferred until `Engine::new` :
`profiler` , `cranelift_flag_enable` , `cranelift_flag_set` , `max_wasm_stack` ,
`async_stack_size` , and `strategy` .
[#4252 ](https://github.com/bytecodealliance/wasmtime/pull/4252 )
[#4262 ](https://github.com/bytecodealliance/wasmtime/pull/4262 )
* Parallel compilation of WebAssembly modules is now enabled in the C API by
default.
[#4270 ](https://github.com/bytecodealliance/wasmtime/pull/4270 )
* Implicit Cargo features of the `wasmtime` introduced through `optional`
dependencies may have been removed since namespaced features are now used.
It's recommended to only used the set of named `[features]` for Wasmtime.
[#4293 ](https://github.com/bytecodealliance/wasmtime/pull/4293 )
* Register allocation has fixed a few issues related to excessive memory usage
at compile time.
[#4324 ](https://github.com/bytecodealliance/wasmtime/pull/4324 )
### Fixed
* A refactor of `Config` was made to fix an issue that the order of calls to `Config`
matters now, which may lead to unexpected behavior.
[#4252 ](https://github.com/bytecodealliance/wasmtime/pull/4252 )
[#4262 ](https://github.com/bytecodealliance/wasmtime/pull/4262 )
* Wasmtime has been fixed to work on SSE2-only x86\_64 platforms when the
`simd` feature is disabled in `Config` .
[#4231 ](https://github.com/bytecodealliance/wasmtime/pull/4231 )
* Generation of platform-specific unwinding information is disabled if
`wasm_backtrace` and `wasm_reference_types` are both disabled.
[#4351 ](https://github.com/bytecodealliance/wasmtime/pull/4351 )
--------------------------------------------------------------------------------
## 0.38.3
Released 2022-07-20.
### Fixed.
* An s390x-specific codegen bug in addition to a mistake introduced in the fix
of CVE-2022-31146 were fixed.
[#4491 ](https://github.com/bytecodealliance/wasmtime/pull/4491 )
--------------------------------------------------------------------------------
## 0.38.2
Released 2022-07-20.
### Fixed.
* A miscompilation when handling constant divisors on AArch64 has been fixed.
[CVE-2022-31169 ](https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-7f6x-jwh5-m9r4 )
* A use-after-free possible with accidentally missing stack maps has been fixed.
[CVE-2022-31146 ](https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-5fhj-g3p3-pq9g )
--------------------------------------------------------------------------------
## 0.38.1
Released 2022-06-27.
### Fixed.
* A register allocator bug was fixed that could affect direct users of
Cranelift who use struct-return (`sret`) arguments. The bug had to do with
the handling of physical register constraints in the function prologue. No
impact should be possible for users of Cranelift via the Wasm frontend,
including Wasmtime.
[regalloc2#60 ](https://github.com/bytecodealliance/regalloc2/pull/60 )
[#4333 ](https://github.com/bytecodealliance/wasmtime/pull/4333 )
* Lowering bugs for the `i8x16.swizzle` and `select` -with-`v128`-inputs
instructions were fixed for the x86\_64 code generator. Note that aarch64 and
s390x are unaffected.
[#4334 ](https://github.com/bytecodealliance/wasmtime/pull/4334 )
* A bug in the 8-bit lowering of integer division on x86-64 was fixed in
Cranelift that could cause a register allocator panic due to an undefined
value in a register. (The divide instruction does not take a register `rdx`
as a source when 8 bits but the metadata incorrectly claimed it did.) No
impact on Wasm/Wasmtime users, and impact on direct Cranelift embedders
limited to compilation panics.
[#4332 ](https://github.com/bytecodealliance/wasmtime/pull/4332 )
--------------------------------------------------------------------------------
## 0.38.0
Released 2022-06-21
### Added
* Enabling or disabling NaN canonicalization in generated code is now exposed
through the C API.
[#4154 ](https://github.com/bytecodealliance/wasmtime/pull/4154 )
* A user-defined callback can now be invoked when an epoch interruption happens
via the `Store::epoch_deadline_callback` API.
[#4152 ](https://github.com/bytecodealliance/wasmtime/pull/4152 )
* Basic alias analysis with redundant-load elimintation and store-to-load
forwarding optimizations has been added to Cranelift.
[#4163 ](https://github.com/bytecodealliance/wasmtime/pull/4163 )
### Changed
* Traps originating from epoch-based interruption are now exposed as
`TrapCode::Interrupt` .
[#4105 ](https://github.com/bytecodealliance/wasmtime/pull/4105 )
* Binary builds for AArch64 now require glibc 2.17 and for s390x require glibc
2.16. Previously glibc 2.28 was required.
[#4171 ](https://github.com/bytecodealliance/wasmtime/pull/4171 )
* The `wasmtime::ValRaw` now has all of its fields listed as private and instead
constructors/accessors are provided for getting at the internal data.
[#4186 ](https://github.com/bytecodealliance/wasmtime/pull/4186 )
* The `wasm-backtrace` Cargo feature has been removed in favor of a
`Config::wasm_backtrace` runtime configuration option. Additionally backtraces
are now only captured when an embedder-generated trap actually reaches a
WebAssembly call stack.
[#4183 ](https://github.com/bytecodealliance/wasmtime/pull/4183 )
* Usage of `*_unchecked` APIs for `Func` in the `wasmtime` crate and C API now
take a `usize` parameter indicating the number of `ValRaw` values behind
the associated pointer.
[#4192 ](https://github.com/bytecodealliance/wasmtime/pull/4192 )
### Fixed
* An improvement was made to the spill-slot allocation in code generation to fix
an issue where some stack slots accidentally weren't reused. This issue was
introduced with the landing of regalloc2 in 0.37.0 and may have resulted in
larger-than-intended increases in stack frame sizes.
[#4222 ](https://github.com/bytecodealliance/wasmtime/pull/4222 )
--------------------------------------------------------------------------------
## 0.37.0
Released 2022-05-20
### Added
* Updated Cranelift to use regalloc2, a new register allocator. This should
result in ~20% faster compile times, and for programs that suffered from
register-allocation pressure before, up to ~20% faster generated code.
[#3989 ](https://github.com/bytecodealliance/wasmtime/pull/3989 )
* Pre-built binaries for macOS M1 machines are now available as release
artifacts.
[#3983 ](https://github.com/bytecodealliance/wasmtime/pull/3983 )
* Copy-on-write images of memory can now be manually initialized for a `Module`
with an explicit method call, but it is still not required to call this method
and will automatically otherwise happen on the first instantiation.
[#3964 ](https://github.com/bytecodealliance/wasmtime/pull/3964 )
### Fixed
* Using `InstancePre::instantiate` or `Linker::instantiate` will now panic as
intended when used with an async-configured `Store` .
[#3972 ](https://github.com/bytecodealliance/wasmtime/pull/3972 )
### Changed
* The unsafe `ValRaw` type in the `wasmtime` crate now always stores its values
in little-endian format instead of the prior native-endian format. Users of
`ValRaw` are recommended to audit their existing code for usage to continue
working on big-endian platforms.
[#4035 ](https://github.com/bytecodealliance/wasmtime/pull/4035 )
### Removed
* Support for `Config::paged_memory_initialization` and the `uffd` crate feature
have been removed from the `wasmtime` crate. Users should migrate to using
`Config::memory_init_cow` which is more portable and faster at this point.
[#4040 ](https://github.com/bytecodealliance/wasmtime/pull/4040 )
--------------------------------------------------------------------------------
## 0.36.0
Released 2022-04-20
### Added
* Support for epoch-based interruption has been added to the C API.
[#3925 ](https://github.com/bytecodealliance/wasmtime/pull/3925 )
* Support for disabling libunwind-based backtraces of WebAssembly code at
compile time has been added.
[#3932 ](https://github.com/bytecodealliance/wasmtime/pull/3932 )
* Async support for call hooks has been added to optionally execute "blocking"
work whenever a wasm module is entered or exited relative to the host.
[#3876 ](https://github.com/bytecodealliance/wasmtime/pull/3876 )
### Fixed
* Loading a `Module` will now check, at runtime, that the compilation settings
enabled in a `Config` are compatible with the native host. For example this
ensures that if avx2 is enabled that the host actually has avx2 support.
[#3899 ](https://github.com/bytecodealliance/wasmtime/pull/3899 )
### Removed
* Support for `Config::interruptable` and `InterruptHandle` has been removed
from the `wasmtime` crate. Users should migrate to using epoch-based
interruption instead.
[#3925 ](https://github.com/bytecodealliance/wasmtime/pull/3925 )
* The module linking implementation of Wasmtime has been removed to make room
for the upcoming support for the component model.
[#3958 ](https://github.com/bytecodealliance/wasmtime/pull/3958 )
--------------------------------------------------------------------------------
## 0.35.3
Released 2022-04-11.
### Fixed
* Backported a bugfix for an instruction lowering issue that could cause a
regalloc panic due to an undefined register in some cases. No miscompilation
was ever possible, but panics would result in a compilation failure.
[#4012 ](https://github.com/bytecodealliance/wasmtime/pull/4012 )
--------------------------------------------------------------------------------
## 0.35.2
Released 2022-03-31.
### Security Fixes
* [CVE-2022-24791 ](https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-gwc9-348x-qwv2 ):
Fixed a use after free with `externref` s and epoch interruption.
## 0.35.1
Released 2022-03-09.
### Fixed
* Fixed a bug in the x86-64 lowering of the `uextend` opcode for narrow (`i8`,
`i16` ) integer sources when the value is produced by one of several
arithmetic instructions.
[#3906 ](https://github.com/bytecodealliance/wasmtime/pull/3906 )
## 0.35.0
Released 2022-03-07.
### Added
* The `wasmtime_wasi::add_to_linker` function now allows providing
a context object of a custom type instead of `wasmtime_wasi::WasiCtx` ,
as long as that type implements the required WASI snapshot traits.
This allows, for example, wrapping `WasiCtx` into a struct and providing
custom implementations for those traits to override the default behaviour.
### Changed
* WebAssembly tables of `funcref` values are now lazily initialized which can,
in some cases, greatly speed up instantiation of a module.
[#3733 ](https://github.com/bytecodealliance/wasmtime/pull/3733 )
* The `memfd` feature in 0.34.0, now renamed to `memory-init-cow` , has been
enabled by default. This means that, where applicable, WebAssembly linear
memories are now initialized with copy-on-write mappings. Support from this
has been expanded from Linux-only to include macOS and other Unix systems when
modules are loaded from precompiled `*.cwasm` files on disk.
[#3777 ](https://github.com/bytecodealliance/wasmtime/pull/3777 )
[#3778 ](https://github.com/bytecodealliance/wasmtime/pull/3778 )
[#3787 ](https://github.com/bytecodealliance/wasmtime/pull/3787 )
[#3819 ](https://github.com/bytecodealliance/wasmtime/pull/3819 )
[#3831 ](https://github.com/bytecodealliance/wasmtime/pull/3831 )
* Clarify that SSE 4.2 (and prior) is required for running WebAssembly code with
simd support enabled on x86\_64.
[#3816 ](https://github.com/bytecodealliance/wasmtime/pull/3816 )
[#3817 ](https://github.com/bytecodealliance/wasmtime/pull/3817 )
[#3833 ](https://github.com/bytecodealliance/wasmtime/pull/3833 )
[#3825 ](https://github.com/bytecodealliance/wasmtime/pull/3825 )
* Support for profiling with VTune is now enabled at compile time by default,
but it remains disabled at runtime by default.
[#3821 ](https://github.com/bytecodealliance/wasmtime/pull/3821 )
* The `ModuleLimits` type has been removed from the configuration of the pooling
allocator in favor of configuring the total size of an instance allocation
rather than each individual field.
[#3837 ](https://github.com/bytecodealliance/wasmtime/pull/3837 )
* The native stack size allowed for WebAssembly has been decreased from 1 MiB to
512 KiB on all platforms to better accomodate running wasm on the main thread
on Windows.
[#3861 ](https://github.com/bytecodealliance/wasmtime/pull/3861 )
* The `wasi-common` crate now supports doing polls for both read and write
interest on a file descriptor at the same time.
[#3866 ](https://github.com/bytecodealliance/wasmtime/pull/3866 )
### Fixed
* The `Store::call_hook` callback is now invoked when entering host functions
defined with `*_unchecked` variants.
[#3881 ](https://github.com/bytecodealliance/wasmtime/pull/3881 )
### Removed
* The incomplete and unmaintained ARM32 backend has been removed from Cranelift.
[#3799 ](https://github.com/bytecodealliance/wasmtime/pull/3799 )
--------------------------------------------------------------------------------
## 0.34.2
Released 2022-03-31.
### Security Fixes
* [CVE-2022-24791 ](https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-gwc9-348x-qwv2 ):
Fixed a use after free with `externref` s and epoch interruption.
## 0.34.1
Released 2022-02-16.
### Security Fixes
* [CVE-2022-23636 ](https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-88xq-w8cq-xfg7 ):
Fixed an invalid drop of a partially-initialized instance in the pooling instance
allocator.
## 0.33.1
Released 2022-02-16.
### Security Fixes
* [CVE-2022-23636 ](https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-88xq-w8cq-xfg7 ):
Fixed an invalid drop of a partially-initialized instance in the pooling instance
allocator.
## 0.34.0
Released 2022-02-07.
### Fixed
* The `wasi-common` default implementation of some attributes of files has been
updated to ensure that `wasi-libc` 's `isatty` function works as intended.
[#3696 ](https://github.com/bytecodealliance/wasmtime/pull/3696 )
* A benign debug assertion related to `externref` and garbage-collection has
been fixed.
[#3734 ](https://github.com/bytecodealliance/wasmtime/pull/3734 )
### Added
* Function names are now automatically demangled when informing profilers of
regions of JIT code to apply Rust-specific demangling rules if applicable.
[#3683 ](https://github.com/bytecodealliance/wasmtime/pull/3683 )
* Support for profiling JIT-generated trampolines with VTune has been added.
[#3687 ](https://github.com/bytecodealliance/wasmtime/pull/3687 )
* Wasmtime now supports a new method of async preemption dubbed "epoch-based
interruption" which is intended to be much more efficient than the current
fuel-based method of preemption.
[#3699 ](https://github.com/bytecodealliance/wasmtime/pull/3699 )
* On Linux Wasmtime will now by default use copy-on-write mappings to initialize
memories of wasm modules where possible, accelerating instantiation by
avoiding costly memory copies. When combined with the pooling allocator this
can also be used to speed up instance-reuse cases due to fewer syscalls to
change memory mappings being necessary.
[#3697 ](https://github.com/bytecodealliance/wasmtime/pull/3697 )
[#3738 ](https://github.com/bytecodealliance/wasmtime/pull/3738 )
[#3760 ](https://github.com/bytecodealliance/wasmtime/pull/3760 )
* Wasmtime now supports the recently-added `sock_accept` WASI function.
[#3711 ](https://github.com/bytecodealliance/wasmtime/pull/3711 )
* Cranelift now has support for specifying blocks as cold.
[#3698 ](https://github.com/bytecodealliance/wasmtime/pull/3698 )
### Changed
* Many more instructions for the x64 backend have been migrated to ISLE,
additionally with refactorings to make incorrect lowerings harder to
accidentally write.
[#3653 ](https://github.com/bytecodealliance/wasmtime/pull/3653 )
[#3659 ](https://github.com/bytecodealliance/wasmtime/pull/3659 )
[#3681 ](https://github.com/bytecodealliance/wasmtime/pull/3681 )
[#3686 ](https://github.com/bytecodealliance/wasmtime/pull/3686 )
[#3688 ](https://github.com/bytecodealliance/wasmtime/pull/3688 )
[#3690 ](https://github.com/bytecodealliance/wasmtime/pull/3690 )
[#3752 ](https://github.com/bytecodealliance/wasmtime/pull/3752 )
* More instructions in the aarch64 backend are now lowered with ISLE.
[#3658 ](https://github.com/bytecodealliance/wasmtime/pull/3658 )
[#3662 ](https://github.com/bytecodealliance/wasmtime/pull/3662 )
* The s390x backend's lowering rules are now almost entirely defined with ISLE.
[#3702 ](https://github.com/bytecodealliance/wasmtime/pull/3702 )
[#3703 ](https://github.com/bytecodealliance/wasmtime/pull/3703 )
[#3706 ](https://github.com/bytecodealliance/wasmtime/pull/3706 )
[#3717 ](https://github.com/bytecodealliance/wasmtime/pull/3717 )
[#3723 ](https://github.com/bytecodealliance/wasmtime/pull/3723 )
[#3724 ](https://github.com/bytecodealliance/wasmtime/pull/3724 )
* Instantiation of modules in Wasmtime has been further optimized now that the
copy-on-write memory initialization removed the previously most-expensive part
of instantiating a module.
[#3727 ](https://github.com/bytecodealliance/wasmtime/pull/3727 )
[#3739 ](https://github.com/bytecodealliance/wasmtime/pull/3739 )
[#3741 ](https://github.com/bytecodealliance/wasmtime/pull/3741 )
[#3742 ](https://github.com/bytecodealliance/wasmtime/pull/3742 )
--------------------------------------------------------------------------------
## 0.33.0
Released 2022-01-05.
### Added
* Compiled wasm modules may now optionally omit debugging information about
mapping addresses to source locations, resulting in smaller binaries.
[#3598 ](https://github.com/bytecodealliance/wasmtime/pull/3598 )
* The WebAssembly SIMD proposal is now enabled by default.
[#3601 ](https://github.com/bytecodealliance/wasmtime/pull/3601 )
--------------------------------------------------------------------------------
## 0.32.1
Released 2022-01-04.
### Fixed
* Cranelift: remove recently-added build dependency on `sha2` to allow usage in
some dependency-sensitive environments, by computing ISLE manifest hashes
with a different hash function.
[#3619 ](https://github.com/bytecodealliance/wasmtime/pull/3619 )
* Cranelift: fixed 8- and 16-bit behavior of popcount (bit population count)
instruction. Does not affect Wasm frontend.
[#3617 ](https://github.com/bytecodealliance/wasmtime/pull/3617 )
* Cranelift: fixed miscompilation of 8- and 16-bit bit-rotate instructions.
Does not affect Wasm frontend.
[#3610 ](https://github.com/bytecodealliance/wasmtime/pull/3610 )
--------------------------------------------------------------------------------
## 0.32.0
Released 2021-12-13.
### Added
* A new configuration option has been added to force using a "static" memory
style to automatically limit growth of memories in some configurations.
[#3503 ](https://github.com/bytecodealliance/wasmtime/pull/3503 )
* The `InstancePre<T>` type now implements `Clone` .
[#3510 ](https://github.com/bytecodealliance/wasmtime/pull/3510 )
* Cranelift's instruction selection process has begun to be migrated towards the
ISLE compiler and definition language.
[#3506 ](https://github.com/bytecodealliance/wasmtime/pull/3506 )
* A `pooling-allocator` feature has been added, which is on-by-default, to
disable the pooling allocator at compile time.
[#3514 ](https://github.com/bytecodealliance/wasmtime/pull/3514 )
### Fixed
* A possible panic when parsing a WebAssembly `name` section has been fixed.
[#3509 ](https://github.com/bytecodealliance/wasmtime/pull/3509 )
* Generating native DWARF information for some C-produced modules has been
fixed, notably those where there may be DWARF about dead code.
[#3498 ](https://github.com/bytecodealliance/wasmtime/pull/3498 )
* A number of SIMD code generation bugs have been fixed in the x64 backend
by migrating their lowerings to ISLE.
--------------------------------------------------------------------------------
## 0.31.0
Released 2021-10-29.
### Added
* New `Func::new_unchecked` and `Func::call_unchecked` APIs have been added with
accompanying functions in the C API to improve the performance of calls into
wasm and the host in the C API.
[#3350 ](https://github.com/bytecodealliance/wasmtime/pull/3350 )
* Release binaries are now available for the s390x-unknown-linux-gnu
architecture.
[#3372 ](https://github.com/bytecodealliance/wasmtime/pull/3372 )
* A new `ResourceLimiterAsync` trait is added which allows asynchronous blocking
of WebAssembly on instructions such as `memory.grow` .
[#3393 ](https://github.com/bytecodealliance/wasmtime/pull/3393 )
### Changed
* The `Func::call` method now takes a slice to write the results into rather
than returning a boxed slice.
[#3319 ](https://github.com/bytecodealliance/wasmtime/pull/3319 )
* Trampolines are now covered when jitdump profiling is enabled.
[#3344 ](https://github.com/bytecodealliance/wasmtime/pull/3344 )
### Fixed
* Debugging with GDB has been fixed on Windows.
[#3373 ](https://github.com/bytecodealliance/wasmtime/pull/3373 )
* Some quadradic behavior in Wasmtime's compilation of modules has been fixed.
[#3469 ](https://github.com/bytecodealliance/wasmtime/pull/3469 )
[#3466 ](https://github.com/bytecodealliance/wasmtime/pull/3466 )
* Bounds-checks for wasm memory accesses in certain non-default configurations
have been fixed to correctly allow loads at the end of the address space.
[#3462 ](https://github.com/bytecodealliance/wasmtime/pull/3462 )
* When type-checking memories and tables for satisfying instance imports the
runtime size of the table/memory is now consulted instead of the object's
original type.
[#3450 ](https://github.com/bytecodealliance/wasmtime/pull/3450 )
### Removed
* The Lightbeam backend has been removed, as per [RFC 14].
[#3390 ](https://github.com/bytecodealliance/wasmtime/pull/3390 )
[RFC 14]: https://github.com/bytecodealliance/rfcs/pull/14
* Cranelift's old x86 backend has been removed, as per [RFC 12].
[#3309 ](https://github.com/bytecodealliance/wasmtime/pull/3009 )
[RFC 12]: https://github.com/bytecodealliance/rfcs/pull/12
## 0.30.0
Released 2021-09-17.
### Security Fixes
* [CVE-2021-39216 ](https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-v4cp-h94r-m7xf ):
Fixed a use after free passing `externref` s to Wasm in Wasmtime.
* [CVE-2021-39218 ](https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-4873-36h9-wv49 ):
Fixed an out-of-bounds read/write and invalid free with `externref` s and GC
safepoints in Wasmtime.
* [CVE-2021-39219 ](https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-q879-9g95-56mx ):
Fixed a bug where using two different `Engine` s with the same `Linker` -define
functions caused unsafety without `unsafe` blocks.
### Added
* Added experimental support for the in-progress 64-bit memories Wasm proposal.
* Added support to build Wasmtime without the compiler. This lets you run
pre-compiled Wasm modules, without the ability (or potential attack surface)
of compiling new Wasm modules. The compilation functionality is gated by the
on-by-default `cranelift` cargo feature.
* Added support for NaN canonicalization with SIMD vectors.
* Added support for differential fuzzing against V8's Wasm engine.
* Added support for fuzzing against the Wasm spec interpreter.
* Enabled SIMD fuzzing on oss-fuzz.
### Changed
* A variety of performance improvements to loading pre-compiled modules.
* A variety of performance improvements to function calls, both through Rust and
the C API.
* Leaf functions that do not use the stack no longer bump the frame pointer on
aarch64 and s390x.
* Many updates and expanded instruction support to the in-progress CLIF
interpreter.
* Expanded fuzzing of reference types and GC.
### Fixed
* A number of fixes to both aarch64 and x86_64 support for the Wasm SIMD
proposal and the underlying CLIF vector instructions.
* Fixed a potential infinite loop in the SSA computation for
`cranelift-frontend` . This was not reachable from `cranelift-wasm` or
Wasmtime, but might have affected general Cranelift users.
### Removed
* The `wasmtime wasm2obj` subcommand has been removed. Generating raw object
files for linking natively is no longer supported. Use the `wasmtime compile`
subcommand to pre-compile a Wasm module and `wasmtime run` to run pre-compiled
Wasm modules.
## 0.29.0
Released 2021-08-02.
### Changed
* Instance exports are now loaded lazily from instances instead of eagerly as
they were before. This is an internal-only change and is not a breaking
change.
[#2984 ](https://github.com/bytecodealliance/wasmtime/pull/2984 )
* All linear memories created by Wasmtime will now, by default, have guard pages
in front of them in addition to after them. This is intended to help mitigate
future bugs in Cranelift, should they arise.
[#2977 ](https://github.com/bytecodealliance/wasmtime/pull/2977 )
* Linear memories now correctly support a maximum size of 4GB. Previously, the
limit field was 32 bits, which did not properly support a full 4GB memory.
This update is also a necessary change in preparation for future memory64
support.
[#3013 ](https://github.com/bytecodealliance/wasmtime/pull/3013 )
[#3134 ](https://github.com/bytecodealliance/wasmtime/pull/3134 )
* Injection counts of fuel into a `wasmtime::Store` now uses a u64 instead of a
u32.
[#3048 ](https://github.com/bytecodealliance/wasmtime/pull/3048 )
### Added
* Support for `i128` has improved in the AArch64 backend.
[#2959 ](https://github.com/bytecodealliance/wasmtime/pull/2959 )
[#2975 ](https://github.com/bytecodealliance/wasmtime/pull/2975 )
[#2985 ](https://github.com/bytecodealliance/wasmtime/pull/2985 )
[#2990 ](https://github.com/bytecodealliance/wasmtime/pull/2990 )
[#3002 ](https://github.com/bytecodealliance/wasmtime/pull/3002 )
[#3004 ](https://github.com/bytecodealliance/wasmtime/pull/3004 )
[#3005 ](https://github.com/bytecodealliance/wasmtime/pull/3005 )
[#3008 ](https://github.com/bytecodealliance/wasmtime/pull/3008 )
[#3027 ](https://github.com/bytecodealliance/wasmtime/pull/3027 )
* The s390x backend now supports z14 and atomics.
[#2988 ](https://github.com/bytecodealliance/wasmtime/pull/2988 )
[#2991 ](https://github.com/bytecodealliance/wasmtime/pull/2991 )
* The `wasmtime::Linker` type now implements `Clone` .
[#2993 ](https://github.com/bytecodealliance/wasmtime/pull/2993 )
* Support for the SIMD proposal on both x86\_64 and AArch64 has improved. On
x86\_64, all SIMD opcodes are now supported.
[#2997 ](https://github.com/bytecodealliance/wasmtime/pull/2997 )
[#3035 ](https://github.com/bytecodealliance/wasmtime/pull/3035 )
[#2982 ](https://github.com/bytecodealliance/wasmtime/pull/2982 )
[#3084 ](https://github.com/bytecodealliance/wasmtime/pull/3084 )
[#3082 ](https://github.com/bytecodealliance/wasmtime/pull/3082 )
[#3107 ](https://github.com/bytecodealliance/wasmtime/pull/3107 )
[#3105 ](https://github.com/bytecodealliance/wasmtime/pull/3105 )
[#3114 ](https://github.com/bytecodealliance/wasmtime/pull/3114 )
[#3070 ](https://github.com/bytecodealliance/wasmtime/pull/3070 )
[#3126 ](https://github.com/bytecodealliance/wasmtime/pull/3126 )
* A `Trap` can now display its reason without also displaying the backtrace.
[#3033 ](https://github.com/bytecodealliance/wasmtime/pull/3033 )
* An initiall fuzzer for CLIF has been added.
[#3038 ](https://github.com/bytecodealliance/wasmtime/pull/3038 )
* High-level architecture documentation has been added for Wasmtime.
[#3019 ](https://github.com/bytecodealliance/wasmtime/pull/3019 )
* Support for multi-memory can now be configured in Wasmtime's C API.
[#3071 ](https://github.com/bytecodealliance/wasmtime/pull/3071 )
* The `wasmtime` crate now supports a `posix-signals-on-macos` feature to force
the usage of signals instead of mach ports to handle traps on macOS.
[#3063 ](https://github.com/bytecodealliance/wasmtime/pull/3063 )
* Wasmtime's C API now has a `wasmtime_trap_code` function to get the raw trap
code, if present, for a trap.
[#3086 ](https://github.com/bytecodealliance/wasmtime/pull/3086 )
* Wasmtime's C API now has a `wasmtime_linker_define_func` function to define a
store-independent function within a linker.
[#3122 ](https://github.com/bytecodealliance/wasmtime/pull/3122 )
* A `wasmtime::Linker::module_async` function was added as the asynchronous
counterpart to `wasmtime::Linker::module` .
[#3121 ](https://github.com/bytecodealliance/wasmtime/pull/3121 )
### Fixed
* Compiling the `wasmtime` crate into a `dylib` crate type has been fixed.
[#3010 ](https://github.com/bytecodealliance/wasmtime/pull/3010 )
* The enter/exit hooks for WebAssembly are now executed for an instance's
`start` function, if present.
[#3001 ](https://github.com/bytecodealliance/wasmtime/pull/3001 )
* Some WASI functions in `wasi-common` have been fixed for big-endian platforms.
[#3016 ](https://github.com/bytecodealliance/wasmtime/pull/3016 )
* Wasmtime no longer erroneously assumes that all custom sections may contain
DWARF information, reducing instances of `Trap` 's `Display` implementation
providing misleading information to set an env var to get more information.
[#3083 ](https://github.com/bytecodealliance/wasmtime/pull/3083 )
* Some issues with parsing DWARF debug information have been fixed.
[#3116 ](https://github.com/bytecodealliance/wasmtime/pull/3116 )
## 0.28.0
Released 2021-06-09.
### Changed
* Breaking: Wasmtime's embedding API has been redesigned, as specified in [RFC
11]. Rust users can now enjoy easier times with `Send` and `Sync` , and all
users can now more clearly manage memory, especially in the C API. Language
embeddings have been updated to the new API as well.
[#2897 ](https://github.com/bytecodealliance/wasmtime/pull/2897 )
[RFC 11]: https://github.com/bytecodealliance/rfcs/pull/11
### Added
* A new `InstancePre` type, created with `Linker::instantiate_pre` , has been
added to perform type-checking of an instance once and reduce the work done
for each instantiation of a module:
[#2962 ](https://github.com/bytecodealliance/wasmtime/pull/2962 )
* Deserialization of a module can now optionally skip checking the wasmtime
version string:
[#2945 ](https://github.com/bytecodealliance/wasmtime/pull/2945 )
* A method has been exposed to frontload per-thread initialization costs if the
latency of every last wasm call is important:
[#2946 ](https://github.com/bytecodealliance/wasmtime/pull/2946 )
* Hooks have been added for entry/exit into wasm code to allow embeddings to
track time and other properties about execution in a wasm environment:
[#2952 ](https://github.com/bytecodealliance/wasmtime/pull/2952 )
* A [C++ embedding of Wasmtime has been written][cpp].
[RFC 11]: https://github.com/bytecodealliance/rfcs/pull/11
[cpp]: https://github.com/bytecodealliance/wasmtime-cpp
### Fixed
* Multiple returns on macOS AArch64 have been fixed:
[#2956 ](https://github.com/bytecodealliance/wasmtime/pull/2956 )
## 0.27.0
Released 2021-05-21.
### Security Fixes
* Fixed a security issue in Cranelift's x64 backend that could result in a heap
sandbox escape due to an incorrect sign-extension:
[#2913 ](https://github.com/bytecodealliance/wasmtime/issues/2913 ).
### Added
* Support for IBM z/Archiecture (`s390x`) machines in Cranelift and Wasmtime:
[#2836 ](https://github.com/bytecodealliance/wasmtime/pull/2836 ),
[#2837 ](https://github.com/bytecodealliance/wasmtime/pull/2837 ),
[#2838 ](https://github.com/bytecodealliance/wasmtime/pull/2838 ),
[#2843 ](https://github.com/bytecodealliance/wasmtime/pull/2843 ),
[#2854 ](https://github.com/bytecodealliance/wasmtime/pull/2854 ),
[#2870 ](https://github.com/bytecodealliance/wasmtime/pull/2870 ),
[#2871 ](https://github.com/bytecodealliance/wasmtime/pull/2871 ),
[#2872 ](https://github.com/bytecodealliance/wasmtime/pull/2872 ),
[#2874 ](https://github.com/bytecodealliance/wasmtime/pull/2874 ).
* Improved async support in wasi-common runtime:
[#2832 ](https://github.com/bytecodealliance/wasmtime/pull/2832 ).
* Added `Store::with_limits` , `StoreLimits` , and `ResourceLimiter` to the
Wasmtime API to help with enforcing resource limits at runtime. The
`ResourceLimiter` trait can be implemented by custom resource limiters to
decide if linear memories or tables can be grown.
* Added `allow-unknown-exports` option for the run command:
[#2879 ](https://github.com/bytecodealliance/wasmtime/pull/2879 ).
* Added API to notify that a `Store` has moved to a new thread:
[#2822 ](https://github.com/bytecodealliance/wasmtime/pull/2822 ).
* Documented guidance around using Wasmtime in multithreaded contexts:
[#2812 ](https://github.com/bytecodealliance/wasmtime/pull/2812 ).
In the future, the Wasmtime API will change to allow some of its core types
to be Send/Sync; see the in-progress
[#2897 ](https://github.com/bytecodealliance/wasmtime/pull/2897 ) for details.
* Support calls from native code to multiple-return-value functions:
[#2806 ](https://github.com/bytecodealliance/wasmtime/pull/2806 ).
### Changed
* Breaking: `Memory::new` has been changed to return `Result` as creating a
host memory object is now a fallible operation when the initial size of
the memory exceeds the store limits.
### Fixed
* Many instruction selection improvements on x64 and aarch64:
[#2819 ](https://github.com/bytecodealliance/wasmtime/pull/2819 ),
[#2828 ](https://github.com/bytecodealliance/wasmtime/pull/2828 ),
[#2823 ](https://github.com/bytecodealliance/wasmtime/pull/2823 ),
[#2862 ](https://github.com/bytecodealliance/wasmtime/pull/2862 ),
[#2886 ](https://github.com/bytecodealliance/wasmtime/pull/2886 ),
[#2889 ](https://github.com/bytecodealliance/wasmtime/pull/2889 ),
[#2905 ](https://github.com/bytecodealliance/wasmtime/pull/2905 ).
* Improved performance of Wasmtime runtime substantially:
[#2811 ](https://github.com/bytecodealliance/wasmtime/pull/2811 ),
[#2818 ](https://github.com/bytecodealliance/wasmtime/pull/2818 ),
[#2821 ](https://github.com/bytecodealliance/wasmtime/pull/2821 ),
[#2847 ](https://github.com/bytecodealliance/wasmtime/pull/2847 ),
[#2900 ](https://github.com/bytecodealliance/wasmtime/pull/2900 ).
* Fixed WASI issue with file metadata on Windows:
[#2884 ](https://github.com/bytecodealliance/wasmtime/pull/2884 ).
* Fixed an issue with debug info and an underflowing (trapping) offset:
[#2866 ](https://github.com/bytecodealliance/wasmtime/pull/2866 ).
* Fixed an issue with unwind information in the old x86 backend:
[#2845 ](https://github.com/bytecodealliance/wasmtime/pull/2845 ).
* Fixed i32 spilling in x64 backend:
[#2840 ](https://github.com/bytecodealliance/wasmtime/pull/2840 ).
## 0.26.0
Released 2021-04-05.
### Added
* Added the `wasmtime compile` command to support AOT compilation of Wasm
modules. This adds the `Engine::precompile_module` method. Also added the
`Config::target` method to change the compilation target of the
configuration. This can be used in conjunction with
`Engine::precompile_module` to target a different host triple than the
current one.
[#2791 ](https://github.com/bytecodealliance/wasmtime/pull/2791 )
* Support for macOS on aarch64 (Apple M1 Silicon), including Apple-specific
calling convention details and unwinding/exception handling using Mach ports.
[#2742 ](https://github.com/bytecodealliance/wasmtime/pull/2742 ),
[#2723 ](https://github.com/bytecodealliance/wasmtime/pull/2723 )
* A number of SIMD instruction implementations in the new x86-64 backend.
[#2771 ](https://github.com/bytecodealliance/wasmtime/pull/2771 )
* Added the `Config::cranelift_flag_enable` method to enable setting Cranelift
boolean flags or presets in a config.
* Added CLI option `--cranelift-enable` to enable boolean settings and ISA presets.
* Deduplicate function signatures in Wasm modules.
[#2772 ](https://github.com/bytecodealliance/wasmtime/pull/2772 )
* Optimize overheads of calling into Wasm functions.
[#2757 ](https://github.com/bytecodealliance/wasmtime/pull/2757 ),
[#2759 ](https://github.com/bytecodealliance/wasmtime/pull/2759 )
* Improvements related to Module Linking: compile fewer trampolines;
[#2774 ](https://github.com/bytecodealliance/wasmtime/pull/2774 )
* Re-export sibling crates from `wasmtime-wasi` to make embedding easier
without needing to match crate versions.
[#2776 ](https://github.com/bytecodealliance/wasmtime/pull/2776 )
### Changed
* Switched the default compiler backend on x86-64 to Cranelift's new backend.
This should not have any user-visible effects other than possibly runtime
performance improvements. The old backend is still available with the
`old-x86-backend` feature flag to the `cranelift-codegen` or `wasmtime`
crates, or programmatically with `BackendVariant::Legacy` . We plan to
maintain the old backend for at least one more release and ensure it works on
CI.
[#2718 ](https://github.com/bytecodealliance/wasmtime/pull/2718 )
* Breaking: `Module::deserialize` has been removed in favor of `Module::new` .
* Breaking: `Config::cranelift_clear_cpu_flags` was removed. Use `Config::target`
to clear the CPU flags for the host's target.
* Breaking: `Config::cranelift_other_flag` was renamed to `Config::cranelift_flag_set` .
* CLI changes:
* Wasmtime CLI options to enable WebAssembly features have been replaced with
a singular `--wasm-features` option. The previous options are still
supported, but are not displayed in help text.
* Breaking: the CLI option `--cranelift-flags` was changed to
`--cranelift-set` .
* Breaking: the CLI option `--enable-reference-types=false` has been changed
to `--wasm-features=-reference-types` .
* Breaking: the CLI option `--enable-multi-value=false` has been changed to
`--wasm-features=-multi-value` .
* Breaking: the CLI option `--enable-bulk-memory=false` has been changed to
`--wasm-features=-bulk-memory` .
* Improved error-reporting in wiggle.
[#2760 ](https://github.com/bytecodealliance/wasmtime/pull/2760 )
* Make WASI sleeping fallible (some systems do not support sleep).
[#2756 ](https://github.com/bytecodealliance/wasmtime/pull/2756 )
* WASI: Support `poll_oneoff` with a sleep.
[#2753 ](https://github.com/bytecodealliance/wasmtime/pull/2753 )
* Allow a `StackMapSink` to be passed when defining functions with
`cranelift-module` .
[#2739 ](https://github.com/bytecodealliance/wasmtime/pull/2739 )
* Some refactoring in new x86-64 backend to prepare for VEX/EVEX (e.g.,
AVX-512) instruction encodings to be supported.
[#2799 ](https://github.com/bytecodealliance/wasmtime/pull/2799 )
### Fixed
* Fixed a corner case in `srem` (signed remainder) in the new x86-64 backend:
`INT_MIN % -1` should return `0` , rather than trapping. This only occurred
when `avoid_div_traps == false` was set by the embedding.
[#2763 ](https://github.com/bytecodealliance/wasmtime/pull/2763 )
* Fixed a memory leak of the `Store` when an instance traps.
[#2803 ](https://github.com/bytecodealliance/wasmtime/pull/2803 )
* Some fuzzing-related fixes.
[#2788 ](https://github.com/bytecodealliance/wasmtime/pull/2788 ),
[#2770 ](https://github.com/bytecodealliance/wasmtime/pull/2770 )
* Fixed memory-initialization bug in uffd allocator that could copy into the
wrong destination under certain conditions. Does not affect the default
wasmtime instance allocator.
[#2801 ](https://github.com/bytecodealliance/wasmtime/pull/2801 )
* Fix printing of float values from the Wasmtime CLI.
[#2797 ](https://github.com/bytecodealliance/wasmtime/pull/2797 )
* Remove the ability for the `Linker` to instantiate modules with duplicate
import strings of different types.
[#2789 ](https://github.com/bytecodealliance/wasmtime/pull/2789 )
## 0.25.0
Released 2021-03-16.
### Added
* An implementation of a pooling instance allocator, optionally backed by
`userfaultfd` on Linux, was added to improve the performance of embeddings
that instantiate a large number of instances continuously.
[#2518 ](https://github.com/bytecodealliance/wasmtime/pull/2518 )
* Host functions can now be defined on `Config` to share the function across all
`Store` objects connected to an `Engine` . This can improve the time it takes
to instantiate instances in a short-lived `Store` .
[#2625 ](https://github.com/bytecodealliance/wasmtime/pull/2625 )
* The `Store` object now supports having typed values attached to it which can
be retrieved from host functions.
[#2625 ](https://github.com/bytecodealliance/wasmtime/pull/2625 )
* The `wiggle` code generator now supports `async` host functions.
[#2701 ](https://github.com/bytecodealliance/wasmtime/pull/2701 )
### Changed
* The `Func::getN{,_async}` APIs have all been removed in favor of a new
`Func::typed` API which should be more compact in terms of API surface area as
well as more flexible in how it can be used.
[#2719 ](https://github.com/bytecodealliance/wasmtime/pull/2719 )
* `Engine::new` has been changed from returning `Engine` to returning
`anyhow::Result<Engine>` . Callers of `Engine::new` will need to be updated to
use the `?` operator on the return value or otherwise unwrap the result to get
the `Engine` .
### Fixed
* Interpretation of timestamps in `poll_oneoff` for WASI have been fixed to
correctly use nanoseconds instead of microseconds.
[#2717 ](https://github.com/bytecodealliance/wasmtime/pull/2717 )
## 0.24.0
Released 2021-03-04.
### Added
* Implement support for `async` functions in Wasmtime
[#2434 ](https://github.com/bytecodealliance/wasmtime/pull/2434 )
### Fixed
* Fix preservation of the sigaltstack on macOS
[#2676 ](https://github.com/bytecodealliance/wasmtime/pull/2676 )
* Fix incorrect semver dependencies involving fs-set-times.
[#2705 ](https://github.com/bytecodealliance/wasmtime/pull/2705 )
* Fix some `i128` shift-related bugs in x64 backend.
[#2682 ](https://github.com/bytecodealliance/wasmtime/pull/2682 )
* Fix incomplete trap metadata due to multiple traps at one address
[#2685 ](https://github.com/bytecodealliance/wasmtime/pull/2685 )
## 0.23.0
Released 2021-02-16.
### Added
* Support for limiting WebAssembly execution with fuel was added, including
support in the C API.
[#2611 ](https://github.com/bytecodealliance/wasmtime/pull/2611 )
[#2643 ](https://github.com/bytecodealliance/wasmtime/pull/2643 )
* Wasmtime now has more knobs for limiting memory and table allocations
[#2617 ](https://github.com/bytecodealliance/wasmtime/pull/2617 )
* Added a method to share `Config` across machines
[#2608 ](https://github.com/bytecodealliance/wasmtime/pull/2608 )
* Added a safe memory read/write API
[#2528 ](https://github.com/bytecodealliance/wasmtime/pull/2528 )
* Added support for the experimental wasi-crypto APIs
[#2597 ](https://github.com/bytecodealliance/wasmtime/pull/2597 )
* Added an instance limit to `Config`
[#2593 ](https://github.com/bytecodealliance/wasmtime/pull/2593 )
* Implemented module-linking's outer module aliases
[#2590 ](https://github.com/bytecodealliance/wasmtime/pull/2590 )
* Cranelift now supports 128-bit operations for the new x64 backend.
[#2539 ](https://github.com/bytecodealliance/wasmtime/pull/2539 )
* Cranelift now has detailed debug-info (DWARF) support in new backends (initially x64).
[#2565 ](https://github.com/bytecodealliance/wasmtime/pull/2565 )
* Cranelift now uses the `POPCNT` , `TZCNT` , and `LZCNT` , as well as SSE 4.1
rounding instructions on x64 when available.
* Cranelift now uses the `CNT` , instruction on aarch64 when available.
### Changed
* A new WASI implementation built on the new
[`cap-std` ](https://github.com/bytecodealliance/cap-std ) crate was added,
replacing the previous implementation. This brings improved robustness,
portability, and performance.
* `wasmtime_wasi::WasiCtxBuilder` moved to
`wasi_cap_std_sync::WasiCtxBuilder` .
* The WebAssembly C API is updated, with a few minor API changes
[#2579 ](https://github.com/bytecodealliance/wasmtime/pull/2579 )
### Fixed
* Fixed a panic in WASI `fd_readdir` on large directories
[#2620 ](https://github.com/bytecodealliance/wasmtime/pull/2620 )
* Fixed a memory leak with command modules
[#2017 ](https://github.com/bytecodealliance/wasmtime/pull/2017 )
--------------------------------------------------------------------------------
## 0.22.0
Released 2021-01-07.
### Added
* Experimental support for [the module-linking
proposal](https://github.com/WebAssembly/module-linking) was
added. [#2094 ](https://github.com/bytecodealliance/wasmtime/pull/2094 )
* Added support for [the reference types
proposal](https://webassembly.github.io/reference-types) on the aarch64
architecture. [#2410 ](https://github.com/bytecodealliance/wasmtime/pull/2410 )
* Experimental support for [wasi-nn ](https://github.com/WebAssembly/wasi-nn ) was
added. [#2208 ](https://github.com/bytecodealliance/wasmtime/pull/2208 )
### Changed
### Fixed
* Fixed an issue where the `select` instruction didn't accept `v128` SIMD
operands. [#2391 ](https://github.com/bytecodealliance/wasmtime/pull/2391 )
* Fixed an issue where Wasmtime could potentially use the wrong stack map during
GCs, leading to a
panic. [#2396 ](https://github.com/bytecodealliance/wasmtime/pull/2396 )
* Fixed an issue where if a host-defined function erroneously returned a value
from a different store, that value would be
leaked. [#2424 ](https://github.com/bytecodealliance/wasmtime/pull/2424 )
* Fixed a bug where in certain cases if a module's instantiation failed, it
could leave trampolines in the store that referenced the no-longer-valid
instance. These trampolines could be reused in future instantiations, leading
to use after free bugs.
[#2408 ](https://github.com/bytecodealliance/wasmtime/pull/2408 )
* Fixed a miscompilation on aarch64 where certain instructions would read `SP`
instead of the zero register. This could only affect you if you explicitly
enabled the Wasm SIMD
proposal. [#2548 ](https://github.com/bytecodealliance/wasmtime/pull/2548 )
--------------------------------------------------------------------------------
## 0.21.0
Released 2020-11-05.
### Added
* Experimental support for the multi-memory proposal was added.
[#2263 ](https://github.com/bytecodealliance/wasmtime/pull/2263 )
* The `Trap::trap_code` API enables learning what kind of trap was raised.
[#2309 ](https://github.com/bytecodealliance/wasmtime/pull/2309 )
### Changed
* WebAssembly module validation is now parallelized.
[#2059 ](https://github.com/bytecodealliance/wasmtime/pull/2059 )
* Documentation is now available at docs.wasmtime.dev.
[#2317 ](https://github.com/bytecodealliance/wasmtime/pull/2317 )
* Windows now compiles like other platforms with a huge guard page instead of
having its own custom limit which made modules compile and run more slowly.
[#2326 ](https://github.com/bytecodealliance/wasmtime/pull/2326 )
* The size of the cache entry for serialized modules has been greatly reduced.
[#2321 ](https://github.com/bytecodealliance/wasmtime/pull/2321 )
[#2322 ](https://github.com/bytecodealliance/wasmtime/pull/2322 )
[#2324 ](https://github.com/bytecodealliance/wasmtime/pull/2324 )
[#2325 ](https://github.com/bytecodealliance/wasmtime/pull/2325 )
* The `FuncType` API constructor and accessors are now iterator-based.
[#2365 ](https://github.com/bytecodealliance/wasmtime/pull/2365 )
### Fixed
* A panic in compiling reference-types-using modules has been fixed.
[#2350 ](https://github.com/bytecodealliance/wasmtime/pull/2350 )
--------------------------------------------------------------------------------
## 0.20.0
Released 2020-09-23.
### Added
* Support for explicitly serializing and deserializing compiled wasm modules has
been added.
[#2020 ](https://github.com/bytecodealliance/wasmtime/pull/2020 )
* A `wasmtime_store_gc` C API was added to run GC for `externref` .
[#2052 ](https://github.com/bytecodealliance/wasmtime/pull/2052 )
* Support for atomics in Cranelift has been added. Support is not fully
implemented in Wasmtime at this time, however.
[#2077 ](https://github.com/bytecodealliance/wasmtime/pull/2077 )
* The `Caller::get_export` function is now implemented for `Func` references as
well.
[#2108 ](https://github.com/bytecodealliance/wasmtime/pull/2108 )
### Fixed
* Leaks in the C API have been fixed.
[#2040 ](https://github.com/bytecodealliance/wasmtime/pull/2040 )
* The `wasm_val_copy` C API has been fixed for reference types.
[#2041 ](https://github.com/bytecodealliance/wasmtime/pull/2041 )
* Fix a panic with `Func::new` and reference types when the store doesn't have
reference types enabled.
[#2039 ](https://github.com/bytecodealliance/wasmtime/pull/2039 )
--------------------------------------------------------------------------------
## 0.19.0
Released 2020-07-14.
### Added
* The [WebAssembly reference-types proposal][reftypes] is now supported in
Wasmtime and the C API.
[#1832 ](https://github.com/bytecodealliance/wasmtime/pull/1832 ),
[#1882 ](https://github.com/bytecodealliance/wasmtime/pull/1882 ),
[#1894 ](https://github.com/bytecodealliance/wasmtime/pull/1894 ),
[#1901 ](https://github.com/bytecodealliance/wasmtime/pull/1901 ),
[#1923 ](https://github.com/bytecodealliance/wasmtime/pull/1923 ),
[#1969 ](https://github.com/bytecodealliance/wasmtime/pull/1969 ),
[#1973 ](https://github.com/bytecodealliance/wasmtime/pull/1973 ),
[#1982 ](https://github.com/bytecodealliance/wasmtime/pull/1982 ),
[#1984 ](https://github.com/bytecodealliance/wasmtime/pull/1984 ),
[#1991 ](https://github.com/bytecodealliance/wasmtime/pull/1991 ),
[#1996 ](https://github.com/bytecodealliance/wasmtime/pull/1996 )
* The [WebAssembly simd proposal's][simd] spec tests now pass in Wasmtime.
[#1765 ](https://github.com/bytecodealliance/wasmtime/pull/1765 ),
[#1876 ](https://github.com/bytecodealliance/wasmtime/pull/1876 ),
[#1941 ](https://github.com/bytecodealliance/wasmtime/pull/1941 ),
[#1957 ](https://github.com/bytecodealliance/wasmtime/pull/1957 ),
[#1990 ](https://github.com/bytecodealliance/wasmtime/pull/1990 ),
[#1994 ](https://github.com/bytecodealliance/wasmtime/pull/1994 )
* Wasmtime can now be compiled without the usage of threads for parallel
compilation, although this is still enabled by default.
[#1903 ](https://github.com/bytecodealliance/wasmtime/pull/1903 )
* The C API is [now
documented](https://bytecodealliance.github.io/wasmtime/c-api/).
[#1928 ](https://github.com/bytecodealliance/wasmtime/pull/1928 ),
[#1959 ](https://github.com/bytecodealliance/wasmtime/pull/1959 ),
[#1968 ](https://github.com/bytecodealliance/wasmtime/pull/1968 )
* A `wasmtime_linker_get_one_by_name` function was added to the C API.
[#1897 ](https://github.com/bytecodealliance/wasmtime/pull/1897 )
* A `wasmtime_trap_exit_status` function was added to the C API.
[#1912 ](https://github.com/bytecodealliance/wasmtime/pull/1912 )
* Compilation for the `aarch64-linux-android` target should now work, although
keep in mind this platform is not fully tested still.
[#2002 ](https://github.com/bytecodealliance/wasmtime/pull/2002 )
[reftypes]: https://github.com/WebAssembly/reference-types
### Fixed
* Runtime warnings when using Wasmtime on musl have been fixed.
[#1914 ](https://github.com/bytecodealliance/wasmtime/pull/1914 )
* A bug affecting Windows unwind information with functions that have spilled
floating point registers has been fixed.
[#1983 ](https://github.com/bytecodealliance/wasmtime/pull/1983 )
### Changed
* Wasmtime's default branch and development now happens on the `main` branch
instead of `master` .
[#1924 ](https://github.com/bytecodealliance/wasmtime/pull/1924 )
### Removed
* The "host info" support in the C API has been removed since it was never fully
or correctly implemented.
[#1922 ](https://github.com/bytecodealliance/wasmtime/pull/1922 )
* Support for the `*_same` functions in the C API has been removed in the same
vein as the host info APIs.
[#1926 ](https://github.com/bytecodealliance/wasmtime/pull/1926 )
--------------------------------------------------------------------------------
## 0.18.0
Release 2020-06-09.
### Added
The `WasmTy` trait is now implemented for `u32` and `u64` .
[#1808 ](https://github.com/bytecodealliance/wasmtime/pull/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 ](https://github.com/bytecodealliance/wasmtime/pull/1565 )
[Commands and Reactors ABI]: https://github.com/WebAssembly/WASI/blob/master/design/application-abi.md#current-unstable-abi
The `Table::grow` function now returns the previous table size, making it consistent
with the `table.grow` instruction.
[#1653 ](https://github.com/bytecodealliance/wasmtime/pull/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 ](https://github.com/bytecodealliance/wasmtime/pull/1654 )
The C API now includes support for enabling logging in Wasmtime.
[#1737 ](https://github.com/bytecodealliance/wasmtime/pull/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 ](https://github.com/bytecodealliance/wasmtime/pull/1646 )
The WebAssembly [multi-value ](https://github.com/WebAssembly/multi-value/ ) proposal
is now enabled by default.
[#1667 ](https://github.com/bytecodealliance/wasmtime/pull/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 ](https://github.com/bytecodealliance/wasmtime/pull/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 ](https://github.com/bytecodealliance/wasmtime/pull/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 ](https://github.com/bytecodealliance/wasmtime/pull/1467 )
* Users now have fine-grained control over creation of instances of `Memory`
with a new `MemoryCreator` trait.
[#1400 ](https://github.com/bytecodealliance/wasmtime/pull/1400 )
* Go bindings for Wasmtime are [now available][go-bindings].
[#1481 ](https://github.com/bytecodealliance/wasmtime/pull/1481 )
* APIs for looking up values in a `Linker` have been added.
[#1480 ](https://github.com/bytecodealliance/wasmtime/pull/1480 )
* Preliminary support for AArch64, also known as ARM64.
[#1581 ](https://github.com/bytecodealliance/wasmtime/pull/1581 )
[go-bindings]: https://github.com/bytecodealliance/wasmtime-go
### Changed
* `Instance::exports` now returns `Export` objects which contain
the `name` s 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 ](https://github.com/bytecodealliance/wasmtime/pull/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 ](https://github.com/bytecodealliance/wasmtime/pull/1467 )
* A number of `wasmtime_linker_*` and `wasmtime_config_*` C APIs have new type
signatures which reflect returning errors.
[#1467 ](https://github.com/bytecodealliance/wasmtime/pull/1467 )
* Bindings for .NET have moved to
https://github.com/bytecodealliance/wasmtime-dotnet.
[#1477 ](https://github.com/bytecodealliance/wasmtime/pull/1477 )
* Passing too many imports to `Instance::new` is now considered an error.
[#1478 ](https://github.com/bytecodealliance/wasmtime/pull/1478 )
### Fixed
* Spurious segfaults due to out-of-stack conditions when handling signals have
been fixed.
[#1315 ](https://github.com/bytecodealliance/wasmtime/pull/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 ](https://bytecodealliance.github.io/wasmtime/ ) and [API
documentation](https://bytecodealliance.github.io/wasmtime/api/wasmtime/)!
* All wasmtime example programs are now in a top-level `examples` directory and
are available in both C and Rust.
[#1286 ](https://github.com/bytecodealliance/wasmtime/pull/1286 )
* A `wasmtime::Linker` type was added to conveniently link link wasm modules
together and create instances that reference one another.
[#1384 ](https://github.com/bytecodealliance/wasmtime/pull/1384 )
* Wasmtime now has "jitdump" support enabled by default which allows [profiling
wasm code on linux][jitdump].
[#1310 ](https://github.com/bytecodealliance/wasmtime/pull/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 ](https://github.com/bytecodealliance/wasmtime/pull/1290 )
* The bulk memory proposal has been fully implemented.
[#1264 ](https://github.com/bytecodealliance/wasmtime/pull/1264 )
[#976 ](https://github.com/bytecodealliance/wasmtime/pull/976 )
* Virtual file support has been added to `wasi-common` .
[#701 ](https://github.com/bytecodealliance/wasmtime/pull/701 )
* The C API has been enhanced with a Wasmtime-specific `wasmtime_wat2wasm` to
parse `*.wat` files via the C API.
[#1206 ](https://github.com/bytecodealliance/wasmtime/pull/1206 )
[jitdump]: https://bytecodealliance.github.io/wasmtime/examples-profiling.html
### Changed
* The `wast` and `wasm2obj` standalone binaries have been removed. They're
available via the `wasmtime wast` and `wasmtime wasm2obj` subcommands.
[#1372 ](https://github.com/bytecodealliance/wasmtime/pull/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 ](https://github.com/bytecodealliance/wasmtime/pull/1202 )
* Wasmtime no longer has a dependency on a C++ compiler.
[#1365 ](https://github.com/bytecodealliance/wasmtime/pull/1365 )
* The `Func::wrapN` APIs have been consolidated into one `Func::wrap` API.
[#1363 ](https://github.com/bytecodealliance/wasmtime/pull/1363 )
* The `Callable` trait has been removed and now `Func::new` takes a closure
directly.
[#1363 ](https://github.com/bytecodealliance/wasmtime/pull/1363 )
* The Cranelift repository has been merged into the Wasmtime repository.
* Support for interface types has been temporarily removed.
[#1292 ](https://github.com/bytecodealliance/wasmtime/pull/1292 )
* The exit code of the `wasmtime` CLI has changed if the program traps.
[#1274 ](https://github.com/bytecodealliance/wasmtime/pull/1274 )
* The `wasmtime` CLI now logs to stderr by default and the `-d` flag has been
renamed to `--log-to-file` .
[#1266 ](https://github.com/bytecodealliance/wasmtime/pull/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 ](https://github.com/bytecodealliance/wasmtime/pull/1016 )
--------------------------------------------------------------------------------
## 0.12.0
Released 2020-02-26.
### Added
* Support for the [WebAssembly text annotations proposal][annotations-proposal]
has been added.
[#998 ](https://github.com/bytecodealliance/wasmtime/pull/998 )
* An initial C API for instantiating WASI modules has been added.
[#977 ](https://github.com/bytecodealliance/wasmtime/pull/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 ](https://github.com/bytecodealliance/wasmtime/pull/955 )
* Initial support for profiling JIT code through perf jitdump has been added.
[#360 ](https://github.com/bytecodealliance/wasmtime/pull/360 )
* More CLI flags corresponding to proposed WebAssembly features have been added.
[#917 ](https://github.com/bytecodealliance/wasmtime/pull/917 )
[annotations-proposal]: https://github.com/webassembly/annotations
### Changed
* The `wasmtime` CLI as well as embedding API will optimize WebAssembly code by
default now.
[#973 ](https://github.com/bytecodealliance/wasmtime/pull/973 )
[#988 ](https://github.com/bytecodealliance/wasmtime/pull/988 )
* The `verifier` pass in Cranelift is now no longer run by default when using
the embedding API.
[#882 ](https://github.com/bytecodealliance/wasmtime/pull/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 ](https://github.com/bytecodealliance/wasmtime/pull/974 )
* Automated releases for tags should be up and running again, along with
automatic publication of the `wasmtime` Python package.
[#971 ](https://github.com/bytecodealliance/wasmtime/pull/971 )
