Add a runtime diagnostics library for Clang's -fcatch-undefined-behavior.

llvm-svn: 165533

1 files changed, 27 insertions, 0 deletions

diff --git a/compiler-rt/lib/ubsan/lit_tests/Integer/add-overflow.cpp b/compiler-rt/lib/ubsan/lit_tests/Integer/add-overflow.cpp
new file mode 100644
index 00000000000..781ccf3a6b9
--- /dev/null
+++ b/compiler-rt/lib/ubsan/lit_tests/Integer/add-overflow.cpp
@@ -0,0 +1,27 @@
+// RUN: %clang -DADD_I32 -fcatch-undefined-behavior %s -o %t && %t 2>&1 | FileCheck %s --check-prefix=ADD_I32
+// RUN: %clang -DADD_I64 -fcatch-undefined-behavior %s -o %t && %t 2>&1 | FileCheck %s --check-prefix=ADD_I64
+// RUN: %clang -DADD_I128 -fcatch-undefined-behavior %s -o %t && %t 2>&1 | FileCheck %s --check-prefix=ADD_I128
+
+#include <stdint.h>
+
+int main() {
+  // These promote to 'int'.
+  (void)(int8_t(0x7f) + int8_t(0x7f));
+  (void)(int16_t(0x3fff) + int16_t(0x4000));
+
+#ifdef ADD_I32
+  int32_t k = 0x12345678;
+  k += 0x789abcde;
+  // CHECK-ADD_I32: add-overflow.cpp:14:5: fatal error: signed integer overflow: 305419896 + 2023406814 cannot be represented in type 'int32_t' (aka 'int')
+#endif
+
+#ifdef ADD_I64
+  (void)(int64_t(8000000000000000000ll) + int64_t(2000000000000000000ll));
+  // CHECK-ADD_I64: 8000000000000000000 + 2000000000000000000 cannot be represented in type 'long'
+#endif
+
+#ifdef ADD_I128
+  (void)((__int128_t(1) << 126) + (__int128_t(1) << 126));
+  // CHECK-ADD_I128: 0x40000000000000000000000000000000 + 0x40000000000000000000000000000000 cannot be represented in type '__int128'
+#endif
+}