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[Asan] Skip pre-split coroutine and noop coroutine frame #99415

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Jul 22, 2024
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1 change: 1 addition & 0 deletions llvm/lib/Transforms/Coroutines/CoroEarly.cpp
Original file line number Diff line number Diff line change
Expand Up @@ -148,6 +148,7 @@ void Lowerer::lowerCoroNoop(IntrinsicInst *II) {
NoopCoro = new GlobalVariable(M, NoopCoroConst->getType(), /*isConstant=*/true,
GlobalVariable::PrivateLinkage, NoopCoroConst,
"NoopCoro.Frame.Const");
cast<GlobalVariable>(NoopCoro)->setNoSanitizeMetadata();
}

Builder.SetInsertPoint(II);
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2 changes: 2 additions & 0 deletions llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp
Original file line number Diff line number Diff line change
Expand Up @@ -2947,6 +2947,8 @@ bool AddressSanitizer::instrumentFunction(Function &F,
if (F.getLinkage() == GlobalValue::AvailableExternallyLinkage) return false;
if (!ClDebugFunc.empty() && ClDebugFunc == F.getName()) return false;
if (F.getName().starts_with("__asan_")) return false;
if (F.isPresplitCoroutine())
return false;
Comment on lines +2950 to +2951
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nit: for consistency with preceding lines:

Suggested change
if (F.isPresplitCoroutine())
return false;
if (F.isPresplitCoroutine()) return false;

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They were on the same line, and I don't see a problem with that (see the first commit), but clang-format complained.


bool FunctionModified = false;

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34 changes: 34 additions & 0 deletions llvm/test/Instrumentation/AddressSanitizer/skip-coro.ll
Original file line number Diff line number Diff line change
@@ -0,0 +1,34 @@
; Tests that asan skips pre-split coroutine and NoopCoro.Frame
; RUN: opt < %s -S -passes=coro-early,asan | FileCheck %s

; CHECK: %NoopCoro.Frame = type { ptr, ptr }
; CHECK: @NoopCoro.Frame.Const = private constant %NoopCoro.Frame { ptr @__NoopCoro_ResumeDestroy, ptr @__NoopCoro_ResumeDestroy }
; CHECK-NOT: @0 = private alias { %NoopCoro.Frame,

%struct.Promise = type { %"struct.std::__n4861::coroutine_handle" }
%"struct.std::__n4861::coroutine_handle" = type { ptr }

; CHECK-LABEL: @foo(
define ptr @foo() #0 {
; CHECK-NEXT: entry
; CHECK-NOT: %asan_local_stack_base
entry:
%__promise = alloca %struct.Promise, align 8
%0 = call token @llvm.coro.id(i32 16, ptr nonnull %__promise, ptr null, ptr null)
%1 = call ptr @llvm.coro.noop()
ret ptr %1
}

declare token @llvm.coro.id(i32, ptr readnone, ptr nocapture readonly, ptr)
declare ptr @llvm.coro.noop()

attributes #0 = { sanitize_address presplitcoroutine }

!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!3, !4}

!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "hand-written", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
!1 = !DIFile(filename: "<stdin>", directory: "")
!2 = !{}
!3 = !{i32 2, !"Dwarf Version", i32 4}
!4 = !{i32 2, !"Debug Info Version", i32 3}
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