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codegen #[naked] functions using global_asm!

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Folkert
2024-08-08 10:20:40 +02:00
committed by Folkert de Vries
parent 9c707a8b76
commit bd8f8e0631
18 changed files with 624 additions and 102 deletions
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11
compiler/rustc_codegen_ssa/src/codegen_attrs.rs
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@@ -542,6 +542,13 @@ fn codegen_fn_attrs(tcx: TyCtxt<'_>, did: LocalDefId) -> CodegenFnAttrs {
}
});
// naked function MUST NOT be inlined! This attribute is required for the rust compiler itself,
// but not for the code generation backend because at that point the naked function will just be
// a declaration, with a definition provided in global assembly.
if codegen_fn_attrs.flags.contains(CodegenFnAttrFlags::NAKED) {
codegen_fn_attrs.inline = InlineAttr::Never;
}
codegen_fn_attrs.optimize = attrs.iter().fold(OptimizeAttr::None, |ia, attr| {
if !attr.has_name(sym::optimize) {
return ia;
@@ -626,10 +633,6 @@ fn codegen_fn_attrs(tcx: TyCtxt<'_>, did: LocalDefId) -> CodegenFnAttrs {
}
}
if codegen_fn_attrs.flags.contains(CodegenFnAttrFlags::NAKED) {
codegen_fn_attrs.inline = InlineAttr::Never;
}
// Weak lang items have the same semantics as "std internal" symbols in the
// sense that they're preserved through all our LTO passes and only
// strippable by the linker.