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rustc_codegen_llvm: properly passing backchain attribute to LLVM ...

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... this is a special attribute that was made to be a target-feature in
LLVM 18+, but in all previous versions, this "feature" is a naked
attribute. We will have to handle this situation differently than all
other target-features.
This commit is contained in:
liushuyu
2024-07-10 11:57:36 +08:00
parent 366bc8691b
commit 01e6e60bf3
3 changed files with 30 additions and 1 deletions
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14
compiler/rustc_codegen_llvm/src/attributes.rs
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@@ -271,6 +271,17 @@ fn stackprotector_attr<'ll>(cx: &CodegenCx<'ll, '_>) -> Option<&'ll Attribute> {
Some(sspattr.create_attr(cx.llcx))
}
fn backchain_attr<'ll>(cx: &CodegenCx<'ll, '_>) -> Option<&'ll Attribute> {
if cx.sess().target.arch != "s390x" {
return None;
}
let requested_features = cx.sess().opts.cg.target_feature.split(',');
let found_positive = requested_features.clone().any(|r| r == "+backchain");
if found_positive { Some(llvm::CreateAttrString(cx.llcx, "backchain")) } else { None }
}
pub fn target_cpu_attr<'ll>(cx: &CodegenCx<'ll, '_>) -> &'ll Attribute {
let target_cpu = llvm_util::target_cpu(cx.tcx.sess);
llvm::CreateAttrStringValue(cx.llcx, "target-cpu", target_cpu)
@@ -447,6 +458,9 @@ pub fn from_fn_attrs<'ll, 'tcx>(
if let Some(align) = codegen_fn_attrs.alignment {
llvm::set_alignment(llfn, align);
}
if let Some(backchain) = backchain_attr(cx) {
to_add.push(backchain);
}
to_add.extend(sanitize_attrs(cx, codegen_fn_attrs.no_sanitize));
to_add.extend(patchable_function_entry_attrs(cx, codegen_fn_attrs.patchable_function_entry));