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Add missing module flags for function-return=thunk-extern

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This commit is contained in:
Alice Ryhl 2024-09-25 10:23:30 +02:00
parent 2933f68abe
commit 540e41f8b3
2 changed files with 19 additions and 1 deletions
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14
compiler/rustc_codegen_llvm/src/context.rs
View File

@ -19,7 +19,7 @@ use rustc_middle::ty::{self, Instance, Ty, TyCtxt};
use rustc_middle::{bug, span_bug};
use rustc_session::Session;
use rustc_session::config::{
BranchProtection, CFGuard, CFProtection, CrateType, DebugInfo, PAuthKey, PacRet,
BranchProtection, CFGuard, CFProtection, CrateType, DebugInfo, FunctionReturn, PAuthKey, PacRet,
};
use rustc_span::source_map::Spanned;
use rustc_span::{DUMMY_SP, Span};
@ -378,6 +378,18 @@ pub(crate) unsafe fn create_module<'ll>(
}
}
match sess.opts.unstable_opts.function_return {
FunctionReturn::Keep => {}
FunctionReturn::ThunkExtern => unsafe {
llvm::LLVMRustAddModuleFlagU32(
llmod,
llvm::LLVMModFlagBehavior::Override,
c"function_return_thunk_extern".as_ptr(),
1,
)
},
}
match (sess.opts.unstable_opts.small_data_threshold, sess.target.small_data_threshold_support())
{
// Set up the small-data optimization limit for architectures that use

6
tests/codegen/function-return.rs
View File

@ -26,3 +26,9 @@ pub fn foo() {
// keep-thunk-extern: attributes #0 = { {{.*}}fn_ret_thunk_extern{{.*}} }
// thunk-extern-keep-NOT: fn_ret_thunk_extern
}
// unset-NOT: !{{[0-9]+}} = !{i32 4, !"function_return_thunk_extern", i32 1}
// keep-NOT: !{{[0-9]+}} = !{i32 4, !"function_return_thunk_extern", i32 1}
// thunk-extern: !{{[0-9]+}} = !{i32 4, !"function_return_thunk_extern", i32 1}
// keep-thunk-extern: !{{[0-9]+}} = !{i32 4, !"function_return_thunk_extern", i32 1}
// thunk-extern-keep-NOT: !{{[0-9]+}} = !{i32 4, !"function_return_thunk_extern", i32 1}