diff options
Diffstat (limited to 'compiler/rustc_codegen_llvm/src/attributes.rs')
| -rw-r--r-- | compiler/rustc_codegen_llvm/src/attributes.rs | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/compiler/rustc_codegen_llvm/src/attributes.rs b/compiler/rustc_codegen_llvm/src/attributes.rs index b3fa7b7cd44..0a7ea599431 100644 --- a/compiler/rustc_codegen_llvm/src/attributes.rs +++ b/compiler/rustc_codegen_llvm/src/attributes.rs @@ -95,11 +95,12 @@ pub fn sanitize_attrs<'ll>( /// Tell LLVM to emit or not emit the information necessary to unwind the stack for the function. #[inline] -pub fn uwtable_attr(llcx: &llvm::Context) -> &Attribute { +pub fn uwtable_attr(llcx: &llvm::Context, use_sync_unwind: Option<bool>) -> &Attribute { // NOTE: We should determine if we even need async unwind tables, as they // take have more overhead and if we can use sync unwind tables we // probably should. - llvm::CreateUWTableAttr(llcx, true) + let async_unwind = !use_sync_unwind.unwrap_or(false); + llvm::CreateUWTableAttr(llcx, async_unwind) } pub fn frame_pointer_type_attr<'ll>(cx: &CodegenCx<'ll, '_>) -> Option<&'ll Attribute> { @@ -333,7 +334,7 @@ pub fn from_fn_attrs<'ll, 'tcx>( // You can also find more info on why Windows always requires uwtables here: // https://bugzilla.mozilla.org/show_bug.cgi?id=1302078 if cx.sess().must_emit_unwind_tables() { - to_add.push(uwtable_attr(cx.llcx)); + to_add.push(uwtable_attr(cx.llcx, cx.sess().opts.unstable_opts.use_sync_unwind)); } if cx.sess().opts.unstable_opts.profile_sample_use.is_some() { |