Vendor import of clang release_32 branch r168974 (effectively, 3.2 RC2):

http://llvm.org/svn/llvm-project/cfe/branches/release_32@168974

1 files changed, 134 insertions, 0 deletions

diff --git a/test/CodeGenCXX/catch-undef-behavior.cpp b/test/CodeGenCXX/catch-undef-behavior.cpp
new file mode 100644
index 0000000..fd9e3d7
--- /dev/null
+++ b/test/CodeGenCXX/catch-undef-behavior.cpp
@@ -0,0 +1,134 @@
+// RUN: %clang_cc1 -fsanitize=signed-integer-overflow,divide-by-zero,shift,unreachable,return,vla-bound,alignment,null,vptr,object-size,float-cast-overflow -emit-llvm %s -o - -triple x86_64-linux-gnu | FileCheck %s
+
+// CHECK: @_Z17reference_binding
+void reference_binding(int *p) {
+  // 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
+  // of the reference's type, the behavior is undefined.
+
+  // CHECK: icmp ne {{.*}}, null
+
+  // CHECK: %[[SIZE:.*]] = call i64 @llvm.objectsize.i64
+  // CHECK-NEXT: icmp uge i64 %[[SIZE]], 4
+
+  // CHECK: %[[PTRINT:.*]] = ptrtoint
+  // 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();
+};
+
+// CHECK: @_Z13member_access
+void member_access(S *p) {
+  // (1a) Check 'p' is appropriately sized and aligned for member access.
+
+  // CHECK: icmp ne {{.*}}, null
+
+  // CHECK: %[[SIZE:.*]] = call i64 @llvm.objectsize.i64
+  // CHECK-NEXT: icmp uge i64 %[[SIZE]], 24
+
+  // CHECK: %[[PTRINT:.*]] = ptrtoint
+  // CHECK-NEXT: %[[MISALIGN:.*]] = and i64 %[[PTRINT]], 7
+  // CHECK-NEXT: icmp eq i64 %[[MISALIGN]], 0
+
+  // (1b) Check that 'p' actually points to an 'S'.
+
+  // CHECK: %[[VPTRADDR:.*]] = bitcast {{.*}} to i64*
+  // CHECK-NEXT: %[[VPTR:.*]] = load i64* %[[VPTRADDR]]
+  //
+  // hash_16_bytes:
+  //
+  // If this number changes, it indicates that either the mangled name of ::S
+  // has changed, or that LLVM's hashing function has changed. The latter case
+  // is OK if the hashing function is still stable.
+  //
+  // The two hash values are for 64- and 32-bit Clang binaries, respectively.
+  // FIXME: We should produce a 64-bit value either way.
+  //
+  // CHECK-NEXT: xor i64 {{-4030275160588942838|2562089159}}, %[[VPTR]]
+  // CHECK-NEXT: mul i64 {{.*}}, -7070675565921424023
+  // CHECK-NEXT: lshr i64 {{.*}}, 47
+  // CHECK-NEXT: xor i64
+  // CHECK-NEXT: xor i64 %[[VPTR]]
+  // CHECK-NEXT: mul i64 {{.*}}, -7070675565921424023
+  // CHECK-NEXT: lshr i64 {{.*}}, 47
+  // CHECK-NEXT: xor i64
+  // CHECK-NEXT: %[[HASH:.*]] = mul i64 {{.*}}, -7070675565921424023
+  //
+  // Check the hash against the table:
+  //
+  // CHECK-NEXT: %[[IDX:.*]] = and i64 %{{.*}}, 127
+  // CHECK-NEXT: getelementptr inbounds [128 x i64]* @__ubsan_vptr_type_cache, i32 0, i64 %[[IDX]]
+  // CHECK-NEXT: %[[CACHEVAL:.*]] = load i64*
+  // CHECK-NEXT: icmp eq i64 %[[CACHEVAL]], %[[HASH]]
+  // CHECK-NEXT: br i1
+
+  // CHECK: call void @__ubsan_handle_dynamic_type_cache_miss({{.*}}, i64 %{{.*}}, i64 %[[HASH]])
+
+  // (2) Check 'p->b' is appropriately sized and aligned for a load.
+
+  // FIXME: Suppress this in the trivial case of a member access, because we
+  // know we've just checked the member access expression itself.
+
+  // CHECK: %[[SIZE:.*]] = call i64 @llvm.objectsize.i64
+  // CHECK-NEXT: icmp uge i64 %[[SIZE]], 4
+
+  // CHECK: %[[PTRINT:.*]] = ptrtoint
+  // CHECK-NEXT: %[[MISALIGN:.*]] = and i64 %[[PTRINT]], 3
+  // CHECK-NEXT: icmp eq i64 %[[MISALIGN]], 0
+  int k = p->b;
+
+  // (3a) Check 'p' is appropriately sized and aligned for member function call.
+
+  // CHECK: icmp ne {{.*}}, null
+
+  // CHECK: %[[SIZE:.*]] = call i64 @llvm.objectsize.i64
+  // CHECK-NEXT: icmp uge i64 %[[SIZE]], 24
+
+  // CHECK: %[[PTRINT:.*]] = ptrtoint
+  // CHECK-NEXT: %[[MISALIGN:.*]] = and i64 %[[PTRINT]], 7
+  // CHECK-NEXT: icmp eq i64 %[[MISALIGN]], 0
+
+  // (3b) Check that 'p' actually points to an 'S'
+
+  // CHECK: load i64*
+  // CHECK-NEXT: xor i64 {{-4030275160588942838|2562089159}},
+  // [...]
+  // CHECK: getelementptr inbounds [128 x i64]* @__ubsan_vptr_type_cache, i32 0, i64 %
+  // CHECK: br i1
+  // CHECK: call void @__ubsan_handle_dynamic_type_cache_miss({{.*}}, i64 %{{.*}}, i64 %{{.*}})
+
+  k = p->f();
+}
+
+// CHECK: @_Z12lsh_overflow
+int lsh_overflow(int a, int b) {
+  // CHECK: %[[INBOUNDS:.*]] = icmp ule i32 %[[RHS:.*]], 31
+  // CHECK-NEXT: br i1 %[[INBOUNDS]]
+
+  // CHECK: %[[SHIFTED_OUT_WIDTH:.*]] = sub nuw nsw i32 31, %[[RHS]]
+  // CHECK-NEXT: %[[SHIFTED_OUT:.*]] = lshr i32 %[[LHS:.*]], %[[SHIFTED_OUT_WIDTH]]
+
+  // This is present for C++11 but not for C: C++ core issue 1457 allows a '1'
+  // to be shifted into the sign bit, but not out of it.
+  // CHECK-NEXT: %[[SHIFTED_OUT_NOT_SIGN:.*]] = lshr i32 %[[SHIFTED_OUT]], 1
+
+  // CHECK-NEXT: %[[NO_OVERFLOW:.*]] = icmp eq i32 %[[SHIFTED_OUT_NOT_SIGN]], 0
+  // CHECK-NEXT: br i1 %[[NO_OVERFLOW]]
+
+  // CHECK: %[[RET:.*]] = shl i32 %[[LHS]], %[[RHS]]
+  // CHECK-NEXT: ret i32 %[[RET]]
+  return a << b;
+}
+
+// CHECK: @_Z9no_return
+int no_return() {
+  // CHECK:      call void @__ubsan_handle_missing_return(i8* bitcast ({{.*}}* @{{.*}} to i8*)) noreturn nounwind
+  // CHECK-NEXT: unreachable
+}