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Add wasm_c_abi future-incompat lint
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daxpedda committed Nov 14, 2023
1 parent 49b27f4 commit ffccdbf
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Showing 2 changed files with 61 additions and 1 deletion.
19 changes: 19 additions & 0 deletions compiler/rustc_lint_defs/src/builtin.rs
Original file line number Diff line number Diff line change
Expand Up @@ -4619,3 +4619,22 @@ declare_lint! {
reference: "issue #115010 <https://github.com/rust-lang/rust/issues/115010>",
};
}

declare_lint! {
/// The `wasm_c_abi` lint detects crate dependencies that are incompatible
/// with future versions of Rust that will emit spec-compliant C ABI.
///
/// ### Explanation
///
/// Rust has historically emitted non-spec-compliant C ABI. This has caused
/// incompatibilities between other compilers and Wasm targets. In a future
/// version of Rust this will be fixed and therefor dependencies relying on
/// the non-spec-compliant C ABI will stop functioning.
pub WASM_C_ABI,
Warn,
"detects dependencies that are incompatible with the Wasm C ABI",
@future_incompatible = FutureIncompatibleInfo {
reason: FutureIncompatibilityReason::FutureReleaseErrorReportInDeps,
reference: "issue #71871 <https://github.com/rust-lang/rust/issues/71871>",
};
}
43 changes: 42 additions & 1 deletion compiler/rustc_metadata/src/creader.rs
Original file line number Diff line number Diff line change
Expand Up @@ -31,8 +31,9 @@ use proc_macro::bridge::client::ProcMacro;
use std::error::Error;
use std::ops::Fn;
use std::path::Path;
use std::str::FromStr;
use std::time::Duration;
use std::{cmp, iter};
use std::{cmp, env, iter};

pub struct CStore {
metadata_loader: Box<MetadataLoaderDyn>,
Expand Down Expand Up @@ -979,13 +980,53 @@ impl<'a, 'tcx> CrateLoader<'a, 'tcx> {
}
}

fn report_future_incompatible_deps(&self, krate: &ast::Crate) {
let name = self.tcx.crate_name(LOCAL_CRATE);

if name.as_str() == "wasm_bindgen" {
if !env::var("CARGO_PKG_VERSION_MAJOR")
.ok()
.and_then(|major| u64::from_str(&major).ok())
.is_some_and(|major| major == 0)
{
return;
}
if !env::var("CARGO_PKG_VERSION_MINOR")
.ok()
.and_then(|minor| u64::from_str(&minor).ok())
.is_some_and(|minor| minor <= 2)
{
return;
}
if !env::var("CARGO_PKG_VERSION_PATCH")
.ok()
.and_then(|patch| u64::from_str(&patch).ok())
.is_some_and(|minor| minor <= 87)
{
return;
}

// Make a point span rather than covering the whole file
let span = krate.spans.inner_span.shrink_to_lo();

self.sess.parse_sess.buffer_lint(
lint::builtin::WASM_C_ABI,
span,
ast::CRATE_NODE_ID,
"older versions of the `wasm-bindgen` crate will be incompatible with future versions of Rust; \
please update to `wasm-bindgen` v0.2.88".to_string(),
);
}
}

pub fn postprocess(&mut self, krate: &ast::Crate) {
self.inject_forced_externs();
self.inject_profiler_runtime(krate);
self.inject_allocator_crate(krate);
self.inject_panic_runtime(krate);

self.report_unused_deps(krate);
self.report_future_incompatible_deps(krate);

info!("{:?}", CrateDump(&self.cstore));
}
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