bjoernager/rust
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Codegen const panic messages as function calls

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This skips emitting extra arguments at every callsite (of which there
can be many). For a librustc_driver build with overflow checks enabled,
this cuts 0.7MB from the resulting binary.
This commit is contained in:
Mark Rousskov 2024-03-17 22:26:39 -04:00
parent 0ad927c0c0
commit 00f4daa276
12 changed files with 255 additions and 63 deletions
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21
compiler/rustc_monomorphize/src/collector.rs
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@ -971,16 +971,17 @@ impl<'a, 'tcx> MirVisitor<'tcx> for MirUsedCollector<'a, 'tcx> {
}
}
}
mir::TerminatorKind::Assert { ref msg, .. } => {
let lang_item = match &**msg {
mir::AssertKind::BoundsCheck { .. } => LangItem::PanicBoundsCheck,
mir::AssertKind::MisalignedPointerDereference { .. } => {
LangItem::PanicMisalignedPointerDereference
}
_ => LangItem::Panic,
};
push_mono_lang_item(self, lang_item);
}
mir::TerminatorKind::Assert { ref msg, .. } => match &**msg {
mir::AssertKind::BoundsCheck { .. } => {
push_mono_lang_item(self, LangItem::PanicBoundsCheck);
}
mir::AssertKind::MisalignedPointerDereference { .. } => {
push_mono_lang_item(self, LangItem::PanicMisalignedPointerDereference);
}
_ => {
push_mono_lang_item(self, msg.panic_function());
}
},
mir::TerminatorKind::UnwindTerminate(reason) => {
push_mono_lang_item(self, reason.lang_item());
}