From 68b3014cd3a1018a95ea5dec579fb7db067f35ba Mon Sep 17 00:00:00 2001 From: Richard Smith Date: Tue, 9 Oct 2012 19:34:32 +0000 Subject: Add a runtime diagnostics library for Clang's -fcatch-undefined-behavior. llvm-svn: 165533 --- .../lib/ubsan/lit_tests/Integer/sub-overflow.cpp | 26 ++++++++++++++++++++++ 1 file changed, 26 insertions(+) create mode 100644 compiler-rt/lib/ubsan/lit_tests/Integer/sub-overflow.cpp (limited to 'compiler-rt/lib/ubsan/lit_tests/Integer/sub-overflow.cpp') diff --git a/compiler-rt/lib/ubsan/lit_tests/Integer/sub-overflow.cpp b/compiler-rt/lib/ubsan/lit_tests/Integer/sub-overflow.cpp new file mode 100644 index 00000000000..71925c9bde8 --- /dev/null +++ b/compiler-rt/lib/ubsan/lit_tests/Integer/sub-overflow.cpp @@ -0,0 +1,26 @@ +// RUN: %clang -DSUB_I32 -fcatch-undefined-behavior %s -o %t && %t 2>&1 | FileCheck %s --check-prefix=SUB_I32 +// RUN: %clang -DSUB_I64 -fcatch-undefined-behavior %s -o %t && %t 2>&1 | FileCheck %s --check-prefix=SUB_I64 +// RUN: %clang -DSUB_I128 -fcatch-undefined-behavior %s -o %t && %t 2>&1 | FileCheck %s --check-prefix=SUB_I128 + +#include + +int main() { + // These promote to 'int'. + (void)(int8_t(-2) - int8_t(0x7f)); + (void)(int16_t(-2) - int16_t(0x7fff)); + +#ifdef SUB_I32 + (void)(int32_t(-2) - int32_t(0x7fffffff)); + // CHECK-SUB_I32: sub-overflow.cpp:13:22: fatal error: signed integer overflow: -2 - 2147483647 cannot be represented in type 'int' +#endif + +#ifdef SUB_I64 + (void)(int64_t(-8000000000000000000ll) - int64_t(2000000000000000000ll)); + // CHECK-SUB_I64: -8000000000000000000 - 2000000000000000000 cannot be represented in type 'long' +#endif + +#ifdef SUB_I128 + (void)(-(__int128_t(1) << 126) - (__int128_t(1) << 126) - 1); + // CHECK-SUB_I128: 0x80000000000000000000000000000000 - 1 cannot be represented in type '__int128' +#endif +} -- cgit v1.2.3