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Compile wasi-common to Emscripten (#688)

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* Compile wasi-common to Emscripten

This commit enables cross-compiling of `wasi-common` to Emscripten. To achieve
this, this commit does quite a bit reshuffling in the existing codebase. Namely,
* rename `linux` modules in `wasi-common` and `yanix` to `linux_like` -- this is
  needed so that we can separate out logic specific to Linux and Emscripten out
* tweak `dir` module in `yanix` to support Emscripten -- in particular, the main
  change involves `SeekLoc::from_raw` which has to be now host-specific, and is now
  fallible
* tweak `filetime` so that in Emscripten we never check for existence of `utimensat`
  at runtime since we are guaranteed for it to exist by design
* since `utimes` and `futimes` are not present in Emscripten, move them into a separate
  module, `utimesat`, and tag it cfg-non-emscripten only
* finally, `to_timespec` is now fallible since on Emscripten we have to cast number of
  seconds, `FileTime::seconds` from `i64` to `libc::c_long` which resolves to `i32`
  unlike on other nixes

* Fix macos build

* Verify wasi-common compiles to Emscripten

This commit adds `emscripten` job to Github Actions which installs
`wasm32-unknown-emscripten` target, and builds `wasi-common` crate.

* Use #[path] to cherry-pick mods for Emscripten

This commit effectively reverses the reorg introduced in 145f4a5
in that it ditches `linux_like` mod for separate mods `linux` and
`emscripten` which are now on the same crate level, and instead,
pulls in common bits from `linux` using the `#[path = ..]` proc
macro.
This commit is contained in:
Jakub Konka
2019-12-12 01:25:13 +01:00
committed by Alex Crichton
parent ddd2300010
commit 95c2addf15
38 changed files with 541 additions and 434 deletions
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28
crates/wasi-common/src/sys/unix/mod.rs
View File

@@ -4,17 +4,23 @@ pub(crate) mod hostcalls_impl;
mod filetime;
#[cfg(any(
target_os = "macos",
target_os = "netbsd",
target_os = "freebsd",
target_os = "openbsd",
target_os = "ios",
target_os = "dragonfly"
))]
mod bsd;
#[cfg(target_os = "linux")]
mod linux;
cfg_if::cfg_if! {
if #[cfg(target_os = "linux")] {
mod linux;
use self::linux as sys_impl;
} else if #[cfg(target_os = "emscripten")] {
mod emscripten;
use self::emscripten as sys_impl;
} else if #[cfg(any(target_os = "macos",
target_os = "netbsd",
target_os = "freebsd",
target_os = "openbsd",
target_os = "ios",
target_os = "dragonfly"))] {
mod bsd;
use self::bsd as sys_impl;
}
}
use crate::Result;
use std::fs::{File, OpenOptions};