* Automate more of Wasmtime's release process
This change revamps the release process for Wasmtime and intends to make
it nearly 100% automated for major release and hopefully still pretty
simple for patch releases. New workflows are introduced as part of
this commit:
* Once a month a PR is created with major version bumps
* Specifically hinted commit messages to the `main` branch will get
tagged and pushed to the main repository.
* On tags we'll now not only build releases after running CI but
additionally crates will be published to crates.io.
In conjunction with other changes this means that the release process
for a new major version of Wasmtime is simply merging a PR. Patch
releases will involve running some steps locally but most of the
nitty-gritty should be simply merging the PR that's generated.
* Use an anchor in a regex
Before this commit we actually have two builders checking for security
advisories on CI, one is `cargo audit` and one is `cargo deny`. The
`cargo deny` builder is slightly different in that it checks a few other
things about our dependency tree such as licenses, duplicates, etc. This
commit removes the advisory check from `cargo deny` on CI and then moves
the `cargo audit` check to a separate workflow.
The `cargo audit` check will now run nightly and will open an issue on
the Wasmtime repository when an advisory is found. This should help make
it such that our CI is never broken by the publication of an advisory
but we're still promptly notified whenever an advisory is made. I've
updated the release process notes to indicate that the open issues
should be double-checked to ensure that there are no open advisories
that we need to take care of.
This commit removes the Lightbeam backend from Wasmtime as per [RFC 14].
This backend hasn't received maintenance in quite some time, and as [RFC
14] indicates this doesn't meet the threshold for keeping the code
in-tree, so this commit removes it.
A fast "baseline" compiler may still be added in the future. The
addition of such a backend should be in line with [RFC 14], though, with
the principles we now have for stable releases of Wasmtime. I'll close
out Lightbeam-related issues once this is merged.
[RFC 14]: https://github.com/bytecodealliance/rfcs/pull/14
* Use rsix to make system calls in Wasmtime.
`rsix` is a system call wrapper crate that we use in `wasi-common`,
which can provide the following advantages in the rest of Wasmtime:
- It eliminates some `unsafe` blocks in Wasmtime's code. There's
still an `unsafe` block in the library, but this way, the `unsafe`
is factored out and clearly scoped.
- And, it makes error handling more consistent, factoring out code for
checking return values and `io::Error::last_os_error()`, and code that
does `errno::set_errno(0)`.
This doesn't cover *all* system calls; `rsix` doesn't implement
signal-handling APIs, and this doesn't cover calls made through `std` or
crates like `userfaultfd`, `rand`, and `region`.
* Finished the Markdown Parser Example for Wasmtime
* Made requested changes
* Tiny change to explanation of `--dir` CLI arg
* Add `bash` annotations to shell script code blocks
* Trying to fix the markdown example bug
* Figured out rustdoc, and what needed to be done
* Made requested changes
Co-authored-by: Till Schneidereit <till@tillschneidereit.net>
* Remove unnecessary into_iter/map
Forgotten from a previous refactoring, this variable was already of the
right type!
* Move `wasmtime_jit::Compiler` into `wasmtime`
This `Compiler` struct is mostly a historical artifact at this point and
wasn't necessarily pulling much weight any more. This organization also
doesn't lend itself super well to compiling out `cranelift` when the
`Compiler` here is used for both parallel iteration configuration
settings as well as compilation.
The movement into `wasmtime` is relatively small, with
`Module::build_artifacts` being the main function added here which is a
merging of the previous functions removed from the `wasmtime-jit` crate.
* Add a `cranelift` compile-time feature to `wasmtime`
This commit concludes the saga of refactoring Wasmtime and making
Cranelift an optional dependency by adding a new Cargo feature to the
`wasmtime` crate called `cranelift`, which is enabled by default.
This feature is implemented by having a new cfg for `wasmtime` itself,
`cfg(compiler)`, which is used wherever compilation is necessary. This
bubbles up to disable APIs such as `Module::new`, `Func::new`,
`Engine::precompile_module`, and a number of `Config` methods affecting
compiler configuration. Checks are added to CI that when built in this
mode Wasmtime continues to successfully build. It's hoped that although
this is effectively "sprinkle `#[cfg]` until things compile" this won't
be too too bad to maintain over time since it's also an use case we're
interested in supporting.
With `cranelift` disabled the only way to create a `Module` is with the
`Module::deserialize` method, which requires some form of precompiled
artifact.
Two consequences of this change are:
* `Module::serialize` is also disabled in this mode. The reason for this
is that serialized modules contain ISA/shared flags encoded in them
which were used to produce the compiled code. There's no storage for
this if compilation is disabled. This could probably be re-enabled in
the future if necessary, but it may not end up being all that necessary.
* Deserialized modules are not checked to ensure that their ISA/shared
flags are compatible with the host CPU. This is actually already the
case, though, with normal modules. We'll likely want to fix this in
the future using a shared implementation for both these locations.
Documentation should be updated to indicate that `cranelift` can be
disabled, although it's not really the most prominent documentation
because this is expected to be a somewhat niche use case (albeit
important, just not too common).
* Always enable cranelift for the C API
* Fix doc example builds
* Fix check tests on GitHub Actions
* Reimplement how unwind information is stored
This commit is a major refactoring of how unwind information is stored
after compilation of a function has finished. Previously we would store
the raw `UnwindInfo` as a result of compilation and this would get
serialized/deserialized alongside the rest of the ELF object that
compilation creates. Whenever functions were registered with
`CodeMemory` this would also result in registering unwinding information
dynamically at runtime, which in the case of Unix, for example, would
dynamically created FDE/CIE entries on-the-fly.
Eventually I'd like to support compiling Wasmtime without Cranelift, but
this means that `UnwindInfo` wouldn't be easily available to decode into
and create unwinding information from. To solve this I've changed the
ELF object created to have the unwinding information encoded into it
ahead-of-time so loading code into memory no longer needs to create
unwinding tables. This change has two different implementations for
Windows/Unix:
* On Windows the implementation was much easier. The unwinding
information on Windows is already stored after the function itself in
the text section. This was actually slightly duplicated in object
building and in code memory allocation. Now the object building
continues to do the same, recording unwinding information after
functions, and code memory no longer manually tracks this.
Additionally Wasmtime will emit a special custom section in the object
file with unwinding information which is the list of
`RUNTIME_FUNCTION` structures that `RtlAddFunctionTable` expects. This
means that the object file has all the information precompiled into it
and registration at runtime is simply passing a few pointers around to
the runtime.
* Unix was a little bit more difficult than Windows. Today a `.eh_frame`
section is created on-the-fly with offsets in FDEs specified as the
absolute address that functions are loaded at. This absolute
address hindered the ability to precompile the FDE into the object
file itself. I've switched how addresses are encoded, though, to using
`DW_EH_PE_pcrel` which means that FDE addresses are now specified
relative to the FDE itself. This means that we can maintain a fixed
offset between the `.eh_frame` loaded in memory and the beginning of
code memory. When doing so this enables precompiling the `.eh_frame`
section into the object file and at runtime when loading an object no
further construction of unwinding information is needed.
The overall result of this commit is that unwinding information is no
longer stored in its cranelift-data-structure form on disk. This means
that this unwinding information format is only present during
compilation, which will make it that much easier to compile out
cranelift in the future.
This commit also significantly refactors `CodeMemory` since the way
unwinding information is handled is not much different from before.
Previously `CodeMemory` was suitable for incrementally adding more and
more functions to it, but nowadays a `CodeMemory` either lives per
module (in which case all functions are known up front) or it's created
once-per-`Func::new` with two trampolines. In both cases we know all
functions up front so the functionality of incrementally adding more and
more segments is no longer needed. This commit removes the ability to
add a function-at-a-time in `CodeMemory` and instead it can now only
load objects in their entirety. A small helper function is added to
build a small object file for trampolines in `Func::new` to handle
allocation there.
Finally, this commit also folds the `wasmtime-obj` crate directly into
the `wasmtime-cranelift` crate and its builder structure to be more
amenable to this strategy of managing unwinding tables.
It is not intentional to have any real functional change as a result of
this commit. This might accelerate loading a module from cache slightly
since less work is needed to manage the unwinding information, but
that's just a side benefit from the main goal of this commit which is to
remove the dependence on cranelift unwinding information being available
at runtime.
* Remove isa reexport from wasmtime-environ
* Trim down reexports of `cranelift-codegen`
Remove everything non-essential so that only the bits which will need to
be refactored out of cranelift remain.
* Fix debug tests
* Review comments
* Port wasi-common to io-lifetimes.
This ports wasi-common from unsafe-io to io-lifetimes.
Ambient authority is now indicated via calls to `ambient_authority()`
from the ambient-authority crate, rather than using `unsafe` blocks.
The `GetSetFdFlags::set_fd_flags` function is now split into two phases,
to simplify lifetimes in implementations which need to close and re-open
the underlying file.
* Use posish for errno values instead of libc.
This eliminates one of the few remaining direct libc dependencies.
* Port to posish::io::poll.
Use posish::io::poll instead of calling libc directly. This factors out
more code from Wasmtime, and eliminates the need to manipulate raw file
descriptors directly.
And, this eliminates the last remaining direct dependency on libc in
wasi-common.
* Port wasi-c-api to io-lifetimes.
* Update to posish 0.16.0.
* Embeded NULs in filenames now get `EINVAL` instead of `EILSEQ`.
* Accept either `EILSEQ` or `EINVAL` for embedded NULs.
* Bump the nightly toolchain to 2021-07-12.
This fixes build errors on the semver crate, which as of this writing
builds with latest nightly and stable but not 2021-04-11, the old pinned
version.
* Have cap-std-sync re-export ambient_authority so that users get the same version.
Implement Wasmtime's new API as designed by RFC 11. This is quite a large commit which has had lots of discussion externally, so for more information it's best to read the RFC thread and the PR thread.
This commit attempts to slim down our CI (more from #2933) by removing
testing both in debug and release mode. I can't actually recall a
concrete issue that this has turned up on CI itself, and otherwise we're
spending quite a lot of time building all of the dev-dependencies in
release mode when testing.
Additionally it removes testing for nightly/beta channels of Rust. One
of the main benefits of this, staying on top of breakage, is already
moot because we pin to a nightly anyway. We have a few nightly
references elsewhere in CI (fuzzing/docs) so we can largely rely on that
(and upstream testing with rust-lang/rust). We in general shouldn't need
to do nightly/beta testing on all builds.
The release builders were actually the only location that MinGW and
AArch64 was tested however. This means that the old nightly/beta
builders are now replaced with AArch64 and MinGW builders. Overall, the
changes made to CI here are:
* Upgrade to QEMU 6.0.0. I thought this would make aarch64 emulation
faster, but it didn't. Seems good to stay up to date though.
* Replace nightly/beta testing in debug mode with MinGW and AArch64 testing.
* Use `-g0` for C compilation on MinGW because otherwise `gcc` as used
on CI generates an ICE (!!)
* Exclude `wasi-crypto` from testing. We already exclude
`wasmtime-wasi-crypto` and it was an accident we were testing the
`wasi-crypto` crate (which isn't even part of this workspace).
* Remove testing DWARF on the old backend step, which nowadays didn't
actually do that.
* Remove testing on release builders, making then purely tasked with
release builds, nothing else.
* Rename `QEMU_VERSION` to `QEMU_BUILD_VERSION` so qemu doesn't just
immediately exit after printing its version.
Timing wise the release builds are ~20-30 minutes faster, depending on
the platform. This is not really because of testing time but rather we
have a huge dependency tree when `dev-dependencies` are considered
(criterion, tokio, proptest, ...).
MinGW tests are pretty fast since we don't run examples (we're not too
interested in doing examples there, just windows/mac/linux coverage).
AArch64 tests are run with optimizations enabled because unoptimized
tests take ~45 minutes to finish while optimized tests take ~20 minutes.
The build is naturally much faster in debug mode but apparently under
QEMU emulation the debug mode binaries are *extremely* slow compared to
the release binaries, which means that extra time we spend compiling
release tests is more than made up by faster test emulation time.
Closes#2938
This commit removes the publish step in GitHub actions, insteading
folding all functionality into the release build steps. This avoids
having a separately scheduled job after all the release build jobs which
ends up getting delayed for quite a long time given the current
scheduling algorithm.
This involves refactoring the tarball assembly scripts and refactoring the
github asset upload script too. Tarball assembly now manages everything
internally and does platform-specific bits where necessary. The upload
script is restructured to be run in parallel (in theory) and hopefully
catches various errors and tries to not stomp over everyone else's work.
The main trickiness here is handling `dev`, which is less critical for
correctness than than tags themselves.
As a small tweak build-wise the QEMU build for cross-compiled builders
is now cached unlike before where it was unconditionally built, shaving
a minute or two off build time.
Also move the gh-pages pushing step from the `publish` phase to just
this singular doc builder.
The motivation for this is to eventually remove the `publish` step since
it interacts badly with GitHub's scheduling of actions. This is
hopefully the first step towards that by removing the doc publish part
of the phase.
* First remove `fail-fast: false` annotations to fail faster. If desired
this could always be added in a on-off fashion to PRs.
* Next use the new `concurrency` feature to try to cancel previous
builds, ideally meaning that if a branch is pushed to multiple times
it only runs CI once.
Looks like GitHub Actions takes 10m+ to upload the documentation and
nearly 10 minutes to download it. I suspect this has to do with the
creation of thousands of files, and using `tar` here is likely much
faster. Let's test it out!
Fixes a few issues that have been cropping up:
* Update `rustup` on Windows to latest to skip over the 1.24.1 installed
on GitHub Actions which can fail to install.
* Remove the no-longer-needed `define-llvm-env` action
* Install generic llvm/lldb packges instead of specific ones that may
migrate in versions over time.
This adds benchmarks around module instantiation using criterion.
Both the default (i.e. on-demand) and pooling allocators are tested
sequentially and in parallel using a thread pool.
Instantiation is tested with an empty module, a module with a single page
linear memory, a larger linear memory with a data initializer, and a "hello
world" Rust WASI program.
This PR switches the default backend on x86, for both the
`cranelift-codegen` crate and for Wasmtime, to the new
(`MachInst`-style, `VCode`-based) backend that has been under
development and testing for some time now.
The old backend is still available by default in builds with the
`old-x86-backend` feature, or by requesting `BackendVariant::Legacy`
from the appropriate APIs.
As part of that switch, it adds some more runtime-configurable plumbing
to the testing infrastructure so that tests can be run using the
appropriate backend. `clif-util test` is now capable of parsing a
backend selector option from filetests and instantiating the correct
backend.
CI has been updated so that the old x86 backend continues to run its
tests, just as we used to run the new x64 backend separately.
At some point, we will remove the old x86 backend entirely, once we are
satisfied that the new backend has not caused any unforeseen issues and
we do not need to revert.
* Use stable Rust on CI to test the x64 backend
This commit leverages the newly-released 1.51.0 compiler to test the
new backend on Windows and Linux with a stable compiler instead of a
nightly compiler. This isolates the nightly build to just the nightly
documentation generation and fuzzing, both of which rely on nightly for
the best results right now.
* Use updated stable in book build job
* Run rustfmt for new stable
* Silence new warnings for wasi-nn
* Allow some dead code in the x64 backend
Looks like new rustc is better about emitting some dead-code warnings
* Update rust in peepmatic job
* Fix a test in the pooling allocator
* Remove `package.metdata.docs.rs` temporarily
Needs resolution of https://github.com/rust-lang/cargo/pull/9300 first
* Fix a warning in a wasi-nn example
This commit adds a "pooling" variant to the wast tests that uses the pooling
instance allocation strategy.
This should help with the test coverage of the pooling instance allocator.
The issue that required the pin to the older version has been resolved.
This keeps the x64 backend tests on an older nightly version to support the
`-Z` flags being passed without having to update Cargo.toml to a new feature
resolver version.
The doc task is also kept on the older nightly for the same reason.
This commit implements the `uffd` feature which turns on support for utilizing
the `userfaultfd` system call on Linux for the pooling instance allocator.
By handling page faults in userland, we are able to detect guard page accesses
without having to constantly change memory page protections.
This should help reduce the number of syscalls as well as kernel lock
contentions when many threads are allocating and deallocating instances.
Additionally, the user fault handler can lazy initialize linear
memories of an instance (implementation to come).
