compiler-rt/test/ubsan_minimal/TestCases/implicit-unsigned-integer-truncation.c

   1 // RUN: %clang -fsanitize=implicit-unsigned-integer-truncation %s -o %t && %run %t 2>&1 | FileCheck %s --check-prefixes=CHECK
   2
   3 #include <stdint.h>
   4
   5 int main() {
   6 // CHECK-NOT: implicit-conversion
   7
   8   // Negative tests. Even if they produce unexpected results, this sanitizer does not care.
   9   int8_t n0 = (~((uint32_t)(0))); // ~0 -> -1, but do not warn.
  10   uint8_t n2 = 128;
  11   uint8_t n3 = 255;
  12   // Bools do not count
  13   _Bool b0 = (~((uint32_t)(0)));
  14   _Bool b1 = 255;
  15
  16   // Explicit and-ing of bits will silence it.
  17   uint8_t nc0 = ((~((uint32_t)(0))) & 255);
  18
  19   // Positive tests.
  20   uint8_t t0 = (~((uint32_t)(0)));
  21 // CHECK: implicit-conversion by 0x{{[[:xdigit:]]+$}}
  22 // CHECK-NOT: implicit-conversion
  23
  24   return 0;
  25 }