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Rollup merge of rust-lang#119616 - rylev:wasm32-wasi-preview2, r=petrochenkov,m-ou-se Add a new `wasm32-wasi-preview2` target This is the initial implementation of the MCP rust-lang/compiler-team#694 creating a new tier 3 target `wasm32-wasi-preview2`. That MCP has been seconded and will most likely be approved in a little over a week from now. For more information on the need for this target, please read the [MCP](rust-lang/compiler-team#694). There is one aspect of this PR that will become insta-stable once these changes reach a stable compiler: * A new `target_family` named `wasi` is introduced. This target family incorporates all wasi targets including `wasm32-wasi` and its derivative `wasm32-wasi-preview1-threads`. The difference between `target_family = wasi` and `target_os = wasi` will become much clearer when `wasm32-wasi` is renamed to `wasm32-wasi-preview1` and the `target_os` becomes `wasm32-wasi-preview1`. You can read about this target rename in [this MCP](rust-lang/compiler-team#695) which has also been seconded and will hopefully be officially approved soon. Additional technical details include: * Both `std::sys::wasi_preview2` and `std::os::wasi_preview2` have been created and mostly use `#[path]` annotations on their submodules to reach into the existing `wasi` (soon to be `wasi_preview1`) modules. Over time the differences between `wasi_preview1` and `wasi_preview2` will grow and most like all `#[path]` based module aliases will fall away. * Building `wasi-preview2` relies on a [`wasi-sdk`](https://github.com/WebAssembly/wasi-sdk) in the same way that `wasi-preview1` does (one must include a `wasi-root` path in the `Config.toml` pointing to sysroot included in the wasi-sdk). The target should build against [wasi-sdk v21](https://github.com/WebAssembly/wasi-sdk/releases/tag/wasi-sdk-21) without modifications. However, the wasi-sdk itself is growing [preview2 support](WebAssembly/wasi-sdk#370) so this might shift rapidly. We will be following along quickly to make sure that building the target remains possible as the wasi-sdk changes. * This requires a [patch to libc](https://github.com/rylev/rust-libc/tree/wasm32-wasi-preview2) that we'll need to land in conjunction with this change. Until that patch lands the target won't actually build.
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compiler/rustc_target/src/spec/targets/wasm32_wasi_preview2.rs
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| //! The `wasm32-wasi-preview2` target is the next evolution of the | ||
| //! wasm32-wasi target. While the wasi specification is still under | ||
| //! active development, the {review 2 iteration is considered an "island | ||
| //! of stability" that should allow users to rely on it indefinitely. | ||
| //! | ||
| //! The `wasi` target is a proposal to define a standardized set of WebAssembly | ||
| //! component imports that allow it to interoperate with the host system in a | ||
| //! standardized way. This set of imports is intended to empower WebAssembly | ||
| //! binaries with host capabilities such as filesystem access, network access, etc. | ||
| //! | ||
| //! Wasi Preview 2 relies on the WebAssembly component model which is an extension of | ||
| //! the core WebAssembly specification which allows interoperability between WebAssembly | ||
| //! modules (known as "components") through high-level, shared-nothing APIs instead of the | ||
| //! low-level, shared-everything linear memory model of the core WebAssembly specification. | ||
| //! | ||
| //! You can see more about wasi at <https://wasi.dev> and the component model at | ||
| //! <https://github.com/WebAssembly/component-model>. | ||
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| use crate::spec::crt_objects; | ||
| use crate::spec::LinkSelfContainedDefault; | ||
| use crate::spec::{base, Target}; | ||
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| pub fn target() -> Target { | ||
| let mut options = base::wasm::options(); | ||
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| options.os = "wasi".into(); | ||
| options.env = "preview2".into(); | ||
| options.linker = Some("wasm-component-ld".into()); | ||
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| options.pre_link_objects_self_contained = crt_objects::pre_wasi_self_contained(); | ||
| options.post_link_objects_self_contained = crt_objects::post_wasi_self_contained(); | ||
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| // FIXME: Figure out cases in which WASM needs to link with a native toolchain. | ||
| options.link_self_contained = LinkSelfContainedDefault::True; | ||
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| // Right now this is a bit of a workaround but we're currently saying that | ||
| // the target by default has a static crt which we're taking as a signal | ||
| // for "use the bundled crt". If that's turned off then the system's crt | ||
| // will be used, but this means that default usage of this target doesn't | ||
| // need an external compiler but it's still interoperable with an external | ||
| // compiler if configured correctly. | ||
| options.crt_static_default = true; | ||
| options.crt_static_respected = true; | ||
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| // Allow `+crt-static` to create a "cdylib" output which is just a wasm file | ||
| // without a main function. | ||
| options.crt_static_allows_dylibs = true; | ||
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| // WASI's `sys::args::init` function ignores its arguments; instead, | ||
| // `args::args()` makes the WASI API calls itself. | ||
| options.main_needs_argc_argv = false; | ||
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| // And, WASI mangles the name of "main" to distinguish between different | ||
| // signatures. | ||
| options.entry_name = "__main_void".into(); | ||
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| Target { | ||
| llvm_target: "wasm32-unknown-unknown".into(), | ||
| pointer_width: 32, | ||
| data_layout: "e-m:e-p:32:32-p10:8:8-p20:8:8-i64:64-n32:64-S128-ni:1:10:20".into(), | ||
| arch: "wasm32".into(), | ||
| options, | ||
| } | ||
| } |
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| //! Platform-specific extensions to `std` for Preview 2 of the WebAssembly System Interface (WASI). | ||
| //! | ||
| //! This module is currently empty, but will be filled over time as wasi-libc support for WASI Preview 2 is stabilized. | ||
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| #![stable(feature = "raw_ext", since = "1.1.0")] |
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,123 @@ | ||
| use crate::io as std_io; | ||
| use crate::mem; | ||
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| #[inline] | ||
| pub fn is_interrupted(errno: i32) -> bool { | ||
| errno == wasi::ERRNO_INTR.raw().into() | ||
| } | ||
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| pub fn decode_error_kind(errno: i32) -> std_io::ErrorKind { | ||
| use std_io::ErrorKind; | ||
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| let Ok(errno) = u16::try_from(errno) else { | ||
| return ErrorKind::Uncategorized; | ||
| }; | ||
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| macro_rules! match_errno { | ||
| ($($($errno:ident)|+ => $errkind:ident),*, _ => $wildcard:ident $(,)?) => { | ||
| match errno { | ||
| $(e if $(e == ::wasi::$errno.raw())||+ => ErrorKind::$errkind),*, | ||
| _ => ErrorKind::$wildcard, | ||
| } | ||
| }; | ||
| } | ||
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| match_errno! { | ||
| ERRNO_2BIG => ArgumentListTooLong, | ||
| ERRNO_ACCES => PermissionDenied, | ||
| ERRNO_ADDRINUSE => AddrInUse, | ||
| ERRNO_ADDRNOTAVAIL => AddrNotAvailable, | ||
| ERRNO_AFNOSUPPORT => Unsupported, | ||
| ERRNO_AGAIN => WouldBlock, | ||
| // ALREADY => "connection already in progress", | ||
| // BADF => "bad file descriptor", | ||
| // BADMSG => "bad message", | ||
| ERRNO_BUSY => ResourceBusy, | ||
| // CANCELED => "operation canceled", | ||
| // CHILD => "no child processes", | ||
| ERRNO_CONNABORTED => ConnectionAborted, | ||
| ERRNO_CONNREFUSED => ConnectionRefused, | ||
| ERRNO_CONNRESET => ConnectionReset, | ||
| ERRNO_DEADLK => Deadlock, | ||
| // DESTADDRREQ => "destination address required", | ||
| ERRNO_DOM => InvalidInput, | ||
| // DQUOT => /* reserved */, | ||
| ERRNO_EXIST => AlreadyExists, | ||
| // FAULT => "bad address", | ||
| ERRNO_FBIG => FileTooLarge, | ||
| ERRNO_HOSTUNREACH => HostUnreachable, | ||
| // IDRM => "identifier removed", | ||
| // ILSEQ => "illegal byte sequence", | ||
| // INPROGRESS => "operation in progress", | ||
| ERRNO_INTR => Interrupted, | ||
| ERRNO_INVAL => InvalidInput, | ||
| ERRNO_IO => Uncategorized, | ||
| // ISCONN => "socket is connected", | ||
| ERRNO_ISDIR => IsADirectory, | ||
| ERRNO_LOOP => FilesystemLoop, | ||
| // MFILE => "file descriptor value too large", | ||
| ERRNO_MLINK => TooManyLinks, | ||
| // MSGSIZE => "message too large", | ||
| // MULTIHOP => /* reserved */, | ||
| ERRNO_NAMETOOLONG => InvalidFilename, | ||
| ERRNO_NETDOWN => NetworkDown, | ||
| // NETRESET => "connection aborted by network", | ||
| ERRNO_NETUNREACH => NetworkUnreachable, | ||
| // NFILE => "too many files open in system", | ||
| // NOBUFS => "no buffer space available", | ||
| ERRNO_NODEV => NotFound, | ||
| ERRNO_NOENT => NotFound, | ||
| // NOEXEC => "executable file format error", | ||
| // NOLCK => "no locks available", | ||
| // NOLINK => /* reserved */, | ||
| ERRNO_NOMEM => OutOfMemory, | ||
| // NOMSG => "no message of the desired type", | ||
| // NOPROTOOPT => "protocol not available", | ||
| ERRNO_NOSPC => StorageFull, | ||
| ERRNO_NOSYS => Unsupported, | ||
| ERRNO_NOTCONN => NotConnected, | ||
| ERRNO_NOTDIR => NotADirectory, | ||
| ERRNO_NOTEMPTY => DirectoryNotEmpty, | ||
| // NOTRECOVERABLE => "state not recoverable", | ||
| // NOTSOCK => "not a socket", | ||
| ERRNO_NOTSUP => Unsupported, | ||
| // NOTTY => "inappropriate I/O control operation", | ||
| ERRNO_NXIO => NotFound, | ||
| // OVERFLOW => "value too large to be stored in data type", | ||
| // OWNERDEAD => "previous owner died", | ||
| ERRNO_PERM => PermissionDenied, | ||
| ERRNO_PIPE => BrokenPipe, | ||
| // PROTO => "protocol error", | ||
| ERRNO_PROTONOSUPPORT => Unsupported, | ||
| // PROTOTYPE => "protocol wrong type for socket", | ||
| // RANGE => "result too large", | ||
| ERRNO_ROFS => ReadOnlyFilesystem, | ||
| ERRNO_SPIPE => NotSeekable, | ||
| ERRNO_SRCH => NotFound, | ||
| // STALE => /* reserved */, | ||
| ERRNO_TIMEDOUT => TimedOut, | ||
| ERRNO_TXTBSY => ResourceBusy, | ||
| ERRNO_XDEV => CrossesDevices, | ||
| ERRNO_NOTCAPABLE => PermissionDenied, | ||
| _ => Uncategorized, | ||
| } | ||
| } | ||
|
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| pub fn abort_internal() -> ! { | ||
| unsafe { libc::abort() } | ||
| } | ||
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| pub fn hashmap_random_keys() -> (u64, u64) { | ||
| let mut ret = (0u64, 0u64); | ||
| unsafe { | ||
| let base = &mut ret as *mut (u64, u64) as *mut u8; | ||
| let len = mem::size_of_val(&ret); | ||
| wasi::random_get(base, len).expect("random_get failure"); | ||
| } | ||
| return ret; | ||
| } | ||
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| #[inline] | ||
| pub(crate) fn err2io(err: wasi::Errno) -> std_io::Error { | ||
| std_io::Error::from_raw_os_error(err.raw().into()) | ||
| } |
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