compiler-rt/test/fuzzer/AbsNegAndConstantTest.cpp

   1 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   2 // See https://llvm.org/LICENSE.txt for license information.
   3 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   4
   5 // abs(x) < 0 and y == Const puzzle.
   6 #include <cstddef>
   7 #include <cstdint>
   8 #include <cstdio>
   9 #include <cstdlib>
  10 #include <cstring>
  11
  12 extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
  13   if (Size < 8) return 0;
  14   int x;
  15   unsigned y;
  16   memcpy(&x, Data, sizeof(x));
  17   memcpy(&y, Data + sizeof(x), sizeof(y));
  18   volatile int abs_x = abs(x);
  19   if (abs_x < 0 && y == 0xbaddcafe) {
  20     printf("BINGO; Found the target, exiting; x = 0x%x y 0x%x\n", x, y);
  21     fflush(stdout);
  22     exit(1);
  23   }
  24   return 0;
  25 }
  26