compiler-rt/test/fuzzer/LargeTest.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 // A fuzz target with lots of edges.
   6 #include <cstdint>
   7 #include <cstdlib>
   8
   9 static inline void break_optimization(const void *arg) {
  10     __asm__ __volatile__("" : : "r" (arg) : "memory");
  11 }
  12
  13 #define A                                         \
  14   do {                                            \
  15     i++;                                          \
  16     c++;                                          \
  17     if (Data[(i + __LINE__) % Size] == (c % 256)) \
  18       break_optimization(Data);                   \
  19     else                                          \
  20       break_optimization(0);                      \
  21   } while (0)
  22
  23 // for (int i = 0, n = Data[(__LINE__ - 1) % Size] % 16; i < n; i++)
  24
  25 #define B do{A; A; A; A; A; A; A; A; A; A; A; A; A; A; A; A; A; A; }while(0)
  26 #define C do{B; B; B; B; B; B; B; B; B; B; B; B; B; B; B; B; B; B; }while(0)
  27 #define D do{C; C; C; C; C; C; C; C; C; }while(0)
  28
  29 volatile int sink;
  30 extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
  31   if (!Size) return 0;
  32   int c = 0;
  33   int i = 0;
  34   D;
  35   return 0;
  36 }
  37