This implements stat device and inode for WASI and GOOS=js, though it
does not implement the host side for windows, yet. Doing windows
requires plumbing as the values needed aren't exposed in Go. When we
re-do the syscallfs file type to have a stat method, we can address that
glitch. Meanwhile, I can find no Go sourcebase that does any better,
though the closest is the implementation details of os.SameFile.
I verified this with wasi-testsuite which now passes all but 1 case
which is unrelated (we haven't yet implemented `lseek`).
Signed-off-by: Adrian Cole <adrian@tetrate.io>
This renames the internal writefs package to syscallfs as it is largely
dependent on syscall signatures. This also implements utimes in gojs.
WASI will be a follow-up change as it requires more infrastructure.
Notably, we also need non-TinyGo tests because TinyGo doesn't yet
support os.Chtimes or corresponding syscalls.
Signed-off-by: Adrian Cole <adrian@tetrate.io>
This uses ioctl syscalls or appropriate alternative, to detect if
stdin/out/err are character devices or not. This caches the result, to
ensure performance is ok at runtime as executing stat can approach
microsecond overhead.
Signed-off-by: Adrian Cole <adrian@tetrate.io>
We originally had a `context.Context` for anything that might be
traced, but it turned out to be only useful for lifecycle and host functions.
For instruction-scoped aspects like memory updates, a context parameter is too
fine-grained and also invisible in practice. For example, most users will use
the compiler engine, and its memory, global or table access will never use go's
context.
Signed-off-by: Adrian Cole <adrian@tetrate.io>
This adds the experimental support of the file system compilation cache.
Notably, experimental.WithCompilationCacheDirName allows users to configure
where the compiler writes the cache into.
Versioning/validation of binary compatibility has been done via the release tag
(which will be created from the end of this month). More specifically, the cache
file starts with a header with the hardcoded wazero version.
Fixes#618
Signed-off-by: Takeshi Yoneda <takeshi@tetrate.io>
Co-authored-by: Crypt Keeper <64215+codefromthecrypt@users.noreply.github.com>
This changes the default random source to provide deterministic values
similar to how nanotime and walltime do. This also prevents any worries
about if wasm can deplete the host's underlying source of entropy.
Signed-off-by: Adrian Cole <adrian@tetrate.io>
FreeBSD was disabled due to lack of testing. This works around the
compilation problems. Note: We can't currently test arm64 automatically!
Notes:
* GitHub Actions doesn’t support FreeBSD, and may never.
* We could use Travis to run FreeBSD, but it would split our CI config.
* Using Vagrant directly is easier to debug than vmactions/freebsd-vm.
* GitHub Actions only supports virtualization on MacOS.
* GitHub Actions removed vagrant from the image starting with macos-11.
* Since VirtualBox doesn't work on arm64, freebsd/arm64 is untestabl
Signed-off-by: Adrian Cole <adrian@tetrate.io>
Signed-off-by: Takeshi Yoneda <takeshi@tetrate.io>
Co-authored-by: Takeshi Yoneda <takeshi@tetrate.io>
This implements wasi_snapshot_preview1.poll_oneoff for relative clock events,
and in doing so stubs `Nanosleep` which defaults to noop, but can be configured
to `time.Sleep`.
Signed-off-by: Adrian Cole <adrian@tetrate.io>
This ensures fake clocks increment so that compilers that implement
sleep with them don't spin.
This also fixes a mutability bug in config where we weren't really doing
clone properly because map references are shared.
Signed-off-by: Adrian Cole <adrian@tetrate.io>
This adds two clock interfaces: sys.Walltime and sys.Nanotime to
allow implementations to override readings for purposes of security or
determinism.
The default values of both are a fake timestamp, to avoid the sandbox
break we formerly had by returning the real time. This is similar to how
we don't inherit OS Env values.
This narrows to what the `internal/platform` package supports, which is
currently bound by Go SDK source that include `Mprotect` or windows.
Ex. `zsyscall_linux_amd64.go` includes `Mprotect`, but
`zsyscall_freebsd_amd64.go` does not.
This should prevent errors like below, by allowing `wazero.NewRuntime()`
to properly fallback to the interpreter.
```
.../mmap.go:74:16: undefined: syscall.Mprotect
```
A later change will implement FreeBSD. This is just here to ensure users
don't crash on unexpected OS.
See #607
Signed-off-by: Adrian Cole <adrian@tetrate.io>
This moves the platform-specific runtime code (currently only used by
the compiler) into its own package. Specifically, this moves the mmap
logic, and in doing so makes it easier to test, for example new
operating systems.
This also backfills missing RATIONALE about x/sys and hints at a future
possibility to allow a plugin. However, the next step is to get FreeBSD
working natively on the compiler without any additional dependencies.
See #607
Signed-off-by: Adrian Cole <adrian@tetrate.io>
