rustc_target/spec/targets/
wasm32_wasip1_threads.rs

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1//! The `wasm32-wasip1-threads` target is an extension of the `wasm32-wasip1`
2//! target where threads are enabled by default for all crates. This target
3//! should be considered "in flux" as WASI itself has moved on from "p1" to "p2"
4//! now and threads in "p2" are still under heavy design.
5//!
6//! This target inherits most of the other aspects of `wasm32-wasip1`.
7//!
8//! Historically this target was known as `wasm32-wasi-preview1-threads`.
9
10use crate::spec::{Cc, LinkSelfContainedDefault, LinkerFlavor, Target, base, crt_objects};
11
12pub(crate) fn target() -> Target {
13    let mut options = base::wasm::options();
14
15    options.os = "wasi".into();
16    options.env = "p1".into();
17
18    options.add_pre_link_args(
19        LinkerFlavor::WasmLld(Cc::No),
20        &["--import-memory", "--export-memory", "--shared-memory"],
21    );
22    options.add_pre_link_args(
23        LinkerFlavor::WasmLld(Cc::Yes),
24        &[
25            "--target=wasm32-wasip1-threads",
26            "-Wl,--import-memory",
27            "-Wl,--export-memory,",
28            "-Wl,--shared-memory",
29        ],
30    );
31
32    options.pre_link_objects_self_contained = crt_objects::pre_wasi_self_contained();
33    options.post_link_objects_self_contained = crt_objects::post_wasi_self_contained();
34
35    // FIXME: Figure out cases in which WASM needs to link with a native toolchain.
36    options.link_self_contained = LinkSelfContainedDefault::True;
37
38    // Right now this is a bit of a workaround but we're currently saying that
39    // the target by default has a static crt which we're taking as a signal
40    // for "use the bundled crt". If that's turned off then the system's crt
41    // will be used, but this means that default usage of this target doesn't
42    // need an external compiler but it's still interoperable with an external
43    // compiler if configured correctly.
44    options.crt_static_default = true;
45    options.crt_static_respected = true;
46
47    // Allow `+crt-static` to create a "cdylib" output which is just a wasm file
48    // without a main function.
49    options.crt_static_allows_dylibs = true;
50
51    // WASI's `sys::args::init` function ignores its arguments; instead,
52    // `args::args()` makes the WASI API calls itself.
53    options.main_needs_argc_argv = false;
54
55    // And, WASI mangles the name of "main" to distinguish between different
56    // signatures.
57    options.entry_name = "__main_void".into();
58
59    options.singlethread = false;
60    options.features = "+atomics,+bulk-memory,+mutable-globals".into();
61
62    Target {
63        llvm_target: "wasm32-wasi".into(),
64        metadata: crate::spec::TargetMetadata {
65            description: None,
66            tier: Some(2),
67            host_tools: Some(false),
68            std: Some(true),
69        },
70        pointer_width: 32,
71        data_layout: "e-m:e-p:32:32-p10:8:8-p20:8:8-i64:64-i128:128-n32:64-S128-ni:1:10:20".into(),
72        arch: "wasm32".into(),
73        options,
74    }
75}
rustc_target/spec/targets/wasm32_wasip1_threads.rs

rustc_target/spec/targets/
wasm32_wasip1_threads.rs
