Rein ubsan's vptr sanitizer back a bit. Per core issue 453, binding a reference

to an object outside its lifetime does not have undefined behavior.

llvm-svn: 170387

1 files changed, 11 insertions, 7 deletions

diff --git a/clang/test/CodeGenCXX/catch-undef-behavior.cpp b/clang/test/CodeGenCXX/catch-undef-behavior.cpp
index a4e13bfa261..9fba80f268d 100644
--- a/clang/test/CodeGenCXX/catch-undef-behavior.cpp
+++ b/clang/test/CodeGenCXX/catch-undef-behavior.cpp
@@ -1,7 +1,13 @@
 // RUN: %clang_cc1 -fsanitize=signed-integer-overflow,integer-divide-by-zero,float-divide-by-zero,shift,unreachable,return,vla-bound,alignment,null,vptr,object-size,float-cast-overflow,bool,enum -emit-llvm %s -o - -triple x86_64-linux-gnu | FileCheck %s
 
+struct S {
+  double d;
+  int a, b;
+  virtual int f();
+};
+
 // CHECK: @_Z17reference_binding
-void reference_binding(int *p) {
+void reference_binding(int *p, S *q) {
   // C++ core issue 453: If an lvalue to which a reference is directly bound
   // designates neither an existing object or function of an appropriate type,
   // nor a region of storage of suitable size and alignment to contain an object
@@ -16,13 +22,11 @@ void reference_binding(int *p) {
   // CHECK-NEXT: %[[MISALIGN:.*]] = and i64 %[[PTRINT]], 3
   // CHECK-NEXT: icmp eq i64 %[[MISALIGN]], 0
   int &r = *p;
-}
 
-struct S {
-  double d;
-  int a, b;
-  virtual int f();
-};
+  // A reference is not required to refer to an object within its lifetime.
+  // CHECK-NOT: __ubsan_handle_dynamic_type_cache_miss
+  S &r2 = *q;
+}
 
 // CHECK: @_Z13member_access
 void member_access(S *p) {