bjoernager/rust
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Add -Zuse-sync-unwind

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This flag specifies whether LLVM generates async unwind or sync unwind.
This commit is contained in:
quininer 2023-11-09 16:46:32 +08:00
parent fcfe05aa75
commit 12784c3166
3 changed files with 8 additions and 4 deletions
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3
compiler/rustc_codegen_llvm/src/allocator.rs
View file

@ -134,7 +134,8 @@ fn create_wrapper_function(
llvm::LLVMRustSetVisibility(llfn, llvm::Visibility::Hidden);
}
if tcx.sess.must_emit_unwind_tables() {
let uwtable = attributes::uwtable_attr(llcx);
let uwtable =
attributes::uwtable_attr(llcx, tcx.sess.opts.unstable_opts.use_sync_unwind);
attributes::apply_to_llfn(llfn, llvm::AttributePlace::Function, &[uwtable]);
}

7
compiler/rustc_codegen_llvm/src/attributes.rs
View file

@ -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() {