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teor
58 lines
2.2 KiB
Rust
58 lines
2.2 KiB
Rust
//! A "bare wasm" target representing a WebAssembly output that does not import
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//! anything from its environment and also specifies an _upper_ bound on the set
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//! of WebAssembly proposals that are supported.
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//!
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//! It's equivalent to the `wasm32-unknown-unknown` target with the additional
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//! flags `-Ctarget-cpu=mvp` and `-Ctarget-feature=+mutable-globals`. This
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//! enables just the features specified in <https://www.w3.org/TR/wasm-core-1/>
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//!
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//! This is a _separate target_ because using `wasm32-unknown-unknown` with
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//! those target flags doesn't automatically rebuild libcore / liballoc with
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//! them, and in order to get those libraries rebuilt you need to use the
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//! nightly Rust feature `-Zbuild-std`. This target is for people who want to
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//! use stable Rust, and target a stable set of WebAssembly features.
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use crate::spec::{Arch, Cc, LinkerFlavor, Os, Target, TargetMetadata, base};
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pub(crate) fn target() -> Target {
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let mut options = base::wasm::options();
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options.os = Os::None;
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// WebAssembly 1.0 shipped in 2019 and included exactly one proposal
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// after the initial "MVP" feature set: "mutable-globals".
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options.cpu = "mvp".into();
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options.features = "+mutable-globals".into();
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options.add_pre_link_args(
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LinkerFlavor::WasmLld(Cc::No),
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&[
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// For now this target just never has an entry symbol no matter the output
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// type, so unconditionally pass this.
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"--no-entry",
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],
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);
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options.add_pre_link_args(
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LinkerFlavor::WasmLld(Cc::Yes),
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&[
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// Make sure clang uses LLD as its linker and is configured appropriately
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// otherwise
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"--target=wasm32-unknown-unknown",
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"-Wl,--no-entry",
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],
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);
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Target {
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llvm_target: "wasm32-unknown-unknown".into(),
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metadata: TargetMetadata {
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description: Some("WebAssembly".into()),
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tier: Some(2),
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host_tools: Some(false),
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std: Some(false),
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},
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pointer_width: 32,
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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(),
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arch: Arch::Wasm32,
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options,
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}
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}
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