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Emit noundef even for unoptimised code if msan is on

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This commit is contained in:
5225225 2022-07-16 12:08:48 +01:00
parent 66dcf5dfee
commit 16525cc4c3
3 changed files with 16 additions and 2 deletions
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8
compiler/rustc_codegen_llvm/src/abi.rs
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@ -19,6 +19,7 @@ use rustc_target::abi::call::ArgAbi;
pub use rustc_target::abi::call::*;
use rustc_target::abi::{self, HasDataLayout, Int};
pub use rustc_target::spec::abi::Abi;
use rustc_target::spec::SanitizerSet;
use libc::c_uint;
use smallvec::SmallVec;
@ -90,6 +91,13 @@ fn get_attrs<'ll>(this: &ArgAttributes, cx: &CodegenCx<'ll, '_>) -> SmallVec<[&'
if regular.contains(ArgAttribute::NoAliasMutRef) && should_use_mutable_noalias(cx) {
attrs.push(llvm::AttributeKind::NoAlias.create_attr(cx.llcx));
}
} else if cx.tcx.sess.opts.unstable_opts.sanitizer.contains(SanitizerSet::MEMORY) {
// If we're not optimising, *but* memory sanitizer is on, emit noundef, since it affects
// memory sanitizer's behavior.
if regular.contains(ArgAttribute::NoUndef) {
attrs.push(llvm::AttributeKind::NoUndef.create_attr(cx.llcx));
}
}
attrs