================
@@ -0,0 +1,37 @@
+// RUN: %clang_cc1 %s -O1 -emit-llvm -fextend-lifetimes -fsanitize=null
-fsanitize-trap=null -o - | FileCheck --check-prefix TRAP %s
+// RUN: %clang_cc1 %s -O1 -emit-llvm -fextend-lifetimes -o - | FileCheck
--check-prefix FAKEUSE %s
+
+// With -fextend-lifetimes the compiler generated a fake.use of a
+// reference variable at the end of the function, in the cleanup block. This
prompted the
+// address sanitizer to verify that the variable has been allocated properly,
even when
+// the function returns early.
+// We check that sanitizers are disabled for code generated for the benefit of
fake.use
+// intrinsics, as well as that the fake.use is no longer generated in the
cleanup block.
+// It should be generated in the block preceding the cleanup block instead.
+
+struct A { short s1, s2; };
+extern A& getA();
+
+void foo()
+{
+ auto& va = getA();
+ short s = va.s1 & ~va.s2;
+ if (s == 0)
+ return;
+
+ auto& vb = getA();
+}
+
+// TRAP: define{{.*}}foo
+// TRAP: [[COMPARE:%[^\s]*]] = icmp eq
+// TRAP-NOT: br i1 [[COMPARE]]{{.*}}trap
+// TRAP: br i1 [[COMPARE]]{{.*}}%if.end
+// TRAP-NOT: trap:
+// TRAP: if.end:
+// TRAP-NOT: call{{.*}}llvm.trap
+
+// FAKEUSE: if.end:
+// FAKEUSE-NEXT: [[CALL:%[^\s]*]] = {{.*}}call{{.*}}getA
+// FAKEUSE-NOT: br{{.*}}cleanup
+// FAKEUSE: call{{.*}}fake.use({{.*}}[[CALL]])
+// FAKEUSE: cleanup:
----------------
jmorse wrote:
IMO better to just explicitly check for each line in the desired output, which
with asan enabled appears to be call-fakeuse-branch and nothing else.
https://github.com/llvm/llvm-project/pull/110102
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