[ShrinkWrapping] Disable the optimization for functions with sanitize like

attribute.

Even if the target supports shrink-wrapping, the prologue and epilogue
must not move because a crash can happen anywhere and sanitizers need
to be able to unwind from the PC of the crash.

llvm-svn: 253116

1 files changed, 40 insertions, 0 deletions

diff --git a/llvm/test/CodeGen/X86/x86-sanitizer-shrink-wrapping.ll b/llvm/test/CodeGen/X86/x86-sanitizer-shrink-wrapping.ll
new file mode 100644
index 00000000000..4cb11bf3f5c
--- /dev/null
+++ b/llvm/test/CodeGen/X86/x86-sanitizer-shrink-wrapping.ll
@@ -0,0 +1,40 @@
+; RUN: llc -o - < %s | FileCheck %s
+
+target datalayout = "e-m:o-i64:64-i128:128-n32:64-S128"
+target triple = "x86_64-apple-macosx"
+
+; Even if the target supports shrink-wrapping, the prologue and epilogue
+; must not move because a crash can happen anywhere and sanitizers need
+; to be able to unwind from the PC of the crash.
+; CHECK-LABEL: sanitize:
+; CHECK: pushq
+; CHECK: incl 40
+; CHECK: popq
+; CHECK-NEXT: retq
+; CHECK: movl $40, %edi
+; CHECK-NEXT callq ___asan_report_load4
+define  void @sanitize() #0 {
+entry:
+  %tmp = load i8, i8* inttoptr (i64 17592186044421 to i8*)
+  %tmp1 = icmp ne i8 %tmp, 0
+  br i1 %tmp1, label %if.then, label %else
+
+if.then:
+  %tmp3 = icmp sge i8 3, %tmp
+  br i1 %tmp3, label %else, label %end
+
+else:
+  call void @__asan_report_load4(i64 40)
+  call void asm sideeffect "", ""()
+  unreachable
+
+end:
+  %tmp6 = load i32, i32* inttoptr (i64 40 to i32*), align 8
+  %inc = add nsw i32 %tmp6, 1
+  store i32 %inc, i32* inttoptr (i64 40 to i32*), align 8
+  ret void
+}
+
+attributes #0 = { sanitize_address nounwind "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" }
+
+declare void @__asan_report_load4(i64)