compiler-rt/test/fuzzer/SignedIntOverflowTest.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 for signed-integer-overflow.
   6 #include <assert.h>
   7 #include <climits>
   8 #include <cstddef>
   9 #include <cstdint>
  10 #include <cstdlib>
  11 #include <iostream>
  12
  13 static volatile int Sink;
  14 static int Large = INT_MAX;
  15
  16 extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
  17   assert(Data);
  18   if (Size > 0 && Data[0] == 'H') {
  19     Sink = 1;
  20     if (Size > 1 && Data[1] == 'i') {
  21       Sink = 2;
  22       if (Size > 2 && Data[2] == '!') {
  23         Large++;  // int overflow.
  24       }
  25     }
  26   }
  27   return 0;
  28 }
  29