compiler-rt/test/fuzzer/ShrinkValueProfileTest.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 // Test that we can find the minimal item in the corpus (4 bytes: "FUZZ").
   6 #include <cstddef>
   7 #include <cstdint>
   8 #include <cstdio>
   9 #include <cstdlib>
  10 #include <cstring>
  11
  12 static volatile uint32_t Sink;
  13
  14 extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
  15   if (Size < sizeof(uint32_t)) return 0;
  16   uint32_t X, Y;
  17   size_t Offset = Size < 8 ? 0 : Size / 2;
  18   memcpy(&X, Data + Offset, sizeof(uint32_t));
  19   memcpy(&Y, "FUZZ", sizeof(uint32_t));
  20   Sink = X == Y;
  21   return 0;
  22 }
  23