break;
}
case Intrinsic::lifetime_start:
+ // Asan needs to poison memory to detect invalid access which is possible
+ // even for empty lifetime range.
+ if (II->getFunction()->hasFnAttribute(Attribute::SanitizeAddress))
+ break;
+
if (removeTriviallyEmptyRange(*II, Intrinsic::lifetime_start,
Intrinsic::lifetime_end, *this))
return nullptr;
--- /dev/null
+; RUN: opt < %s -instcombine -S | FileCheck %s
+
+declare void @llvm.lifetime.start(i64, i8* nocapture)
+declare void @llvm.lifetime.end(i64, i8* nocapture)
+declare void @foo(i8* nocapture)
+
+define void @asan() sanitize_address {
+entry:
+ ; CHECK-LABEL: @asan(
+ %text = alloca i8, align 1
+
+ call void @llvm.lifetime.start(i64 1, i8* %text)
+ call void @llvm.lifetime.end(i64 1, i8* %text)
+ ; CHECK: call void @llvm.lifetime.start
+ ; CHECK-NEXT: call void @llvm.lifetime.end
+
+ call void @foo(i8* %text) ; Keep alloca alive
+
+ ret void
+}
+
+
+define void @no_asan() {
+entry:
+ ; CHECK-LABEL: @no_asan(
+ %text = alloca i8, align 1
+
+ call void @llvm.lifetime.start(i64 1, i8* %text)
+ call void @llvm.lifetime.end(i64 1, i8* %text)
+ ; CHECK-NO: call void @llvm.lifetime
+
+ call void @foo(i8* %text) ; Keep alloca alive
+
+ ret void
+}