| 1 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 2 | // See https://llvm.org/LICENSE.txt for license information. |
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| 3 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 4 | |
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| 5 | // A fuzz target with lots of edges. |
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| 6 | #include <cstdint> |
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| 7 | #include <cstdlib> |
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| 8 | |
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| 9 | static inline void break_optimization(const void *arg) { |
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| 10 | __asm__ __volatile__("" : : "r" (arg) : "memory" ); |
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| 11 | } |
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| 12 | |
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| 13 | #define A \ |
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| 14 | do { \ |
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| 15 | i++; \ |
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| 16 | c++; \ |
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| 17 | if (Data[(i + __LINE__) % Size] == (c % 256)) \ |
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| 18 | break_optimization(Data); \ |
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| 19 | else \ |
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| 20 | break_optimization(0); \ |
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| 21 | } while (0) |
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| 22 | |
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| 23 | // for (int i = 0, n = Data[(__LINE__ - 1) % Size] % 16; i < n; i++) |
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| 24 | |
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| 25 | #define B do{A; A; A; A; A; A; A; A; A; A; A; A; A; A; A; A; A; A; }while(0) |
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| 26 | #define C do{B; B; B; B; B; B; B; B; B; B; B; B; B; B; B; B; B; B; }while(0) |
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| 27 | #define D do{C; C; C; C; C; C; C; C; C; }while(0) |
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| 28 | |
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| 29 | volatile int sink; |
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| 30 | extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) { |
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| 31 | if (!Size) return 0; |
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| 32 | int c = 0; |
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| 33 | int i = 0; |
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| 34 | D; |
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| 35 | return 0; |
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| 36 | } |
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| 37 | |
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| 38 | |
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