src/libcompiler_builtins/compiler-rt/test/ubsan/TestCases/Integer/sub-overflow.cpp

   1 // RUN: %clangxx -DSUB_I32 -fsanitize=signed-integer-overflow %s -o %t1 && %run %t1 2>&1 | FileCheck %s --check-prefix=CHECK-SUB_I32
   2 // RUN: %clangxx -DSUB_I64 -fsanitize=signed-integer-overflow %s -o %t2 && %run %t2 2>&1 | FileCheck %s --check-prefix=CHECK-SUB_I64
   3 // RUN: %clangxx -DSUB_I128 -fsanitize=signed-integer-overflow %s -o %t3 && %run %t3 2>&1 | FileCheck %s --check-prefix=CHECK-SUB_I128
   4
   5 #include <stdint.h>
   6 #include <stdio.h>
   7
   8 int main() {
   9   // These promote to 'int'.
  10   (void)(int8_t(-2) - int8_t(0x7f));
  11   (void)(int16_t(-2) - int16_t(0x7fff));
  12
  13 #ifdef SUB_I32
  14   (void)(int32_t(-2) - int32_t(0x7fffffff));
  15   // CHECK-SUB_I32: sub-overflow.cpp:[[@LINE-1]]:22: runtime error: signed integer overflow: -2 - 2147483647 cannot be represented in type 'int'
  16 #endif
  17
  18 #ifdef SUB_I64
  19   (void)(int64_t(-8000000000000000000ll) - int64_t(2000000000000000000ll));
  20   // CHECK-SUB_I64: -8000000000000000000 - 2000000000000000000 cannot be represented in type '{{long( long)?}}'
  21 #endif
  22
  23 #ifdef SUB_I128
  24 # if defined(__SIZEOF_INT128__) && !defined(_WIN32)
  25   (void)(-(__int128_t(1) << 126) - (__int128_t(1) << 126) - 1);
  26 # else
  27   puts("__int128 not supported");
  28 # endif
  29   // CHECK-SUB_I128: {{0x80000000000000000000000000000000 - 1 cannot be represented in type '__int128'|__int128 not supported}}
  30 #endif
  31 }