compiler-rt/test/fuzzer/DSOTestMain.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 // Source code for a simple DSO.
   6
   7 #include <cstdint>
   8 #include <cstdio>
   9 #include <cstdlib>
  10 #include <cstring>
  11 extern int DSO1(int a);
  12 extern int DSO2(int a);
  13 extern int DSOTestExtra(int a);
  14
  15 static volatile int *nil = 0;
  16
  17 extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
  18   int x, y, z;
  19   if (Size < sizeof(int) * 3) {
  20     x = y = z = 0;
  21   } else {
  22     memcpy(&x, Data + 0 * sizeof(int), sizeof(int));
  23     memcpy(&y, Data + 1 * sizeof(int), sizeof(int));
  24     memcpy(&z, Data + 2 * sizeof(int), sizeof(int));
  25   }
  26   int sum = DSO1(x) + DSO2(y) + (z ? DSOTestExtra(z) : 0);
  27   if (sum == 3) {
  28     fprintf(stderr, "BINGO %d %d %d\n", x, y, z);
  29     *nil = 0;
  30   }
  31   return 0;
  32 }