bjoernager/rust
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Migrate weak_lang_items.rs

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rdvdev2 2022-08-22 10:05:13 +02:00 • committed by Nathan Stocks
parent bde80f745b
commit 2f74d1d14f
3 changed files with 31 additions and 10 deletions
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17
compiler/rustc_passes/src/errors.rs
View file

@ -665,3 +665,20 @@ pub struct DeprecatedAnnotationHasNoEffect {
#[suggestion(applicability = "machine-applicable", code = "")]
pub span: Span,
}
#[derive(Diagnostic)]
#[diag(passes::missing_panic_handler)]
pub struct MissingPanicHandler;
#[derive(Diagnostic)]
#[diag(passes::missing_alloc_error_handler)]
#[note]
pub struct MissingAllocErrorHandler;
#[derive(Diagnostic)]
#[diag(passes::missing_lang_item)]
#[note]
#[help]
pub struct MissingLangItem {
pub name: Symbol,
}

15
compiler/rustc_passes/src/weak_lang_items.rs
View file

@ -8,6 +8,8 @@ use rustc_middle::middle::lang_items::required;
use rustc_middle::ty::TyCtxt;
use rustc_session::config::CrateType;
use crate::errors::{MissingAllocErrorHandler, MissingLangItem, MissingPanicHandler};
/// Checks the crate for usage of weak lang items, returning a vector of all the
/// language items required by this crate, but not defined yet.
pub fn check_crate<'tcx>(tcx: TyCtxt<'tcx>, items: &mut lang_items::LanguageItems) {
@ -71,20 +73,13 @@ fn verify<'tcx>(tcx: TyCtxt<'tcx>, items: &lang_items::LanguageItems) {
for (name, &item) in WEAK_ITEMS_REFS.iter() {
if missing.contains(&item) && required(tcx, item) && items.require(item).is_err() {
if item == LangItem::PanicImpl {
tcx.sess.err("`#[panic_handler]` function required, but not found");
tcx.sess.emit_err(MissingPanicHandler);
} else if item == LangItem::Oom {
if !tcx.features().default_alloc_error_handler {
tcx.sess.err("`#[alloc_error_handler]` function required, but not found");
tcx.sess.note_without_error("use `#![feature(default_alloc_error_handler)]` for a default error handler");
tcx.sess.emit_err(MissingAllocErrorHandler);
}
} else {
tcx
.sess
.diagnostic()
.struct_err(&format!("language item required, but not found: `{}`", name))
.note(&format!("this can occur when a binary crate with `#![no_std]` is compiled for a target where `{}` is defined in the standard library", name))
.help(&format!("you may be able to compile for a target that doesn't need `{}`, specify a target with `--target` or in `.cargo/config`", name))
.emit();
tcx.sess.emit_err(MissingLangItem { name: *name });
}
}
}