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 // Find "FUZZME", the target has 3 different functions.
6 //
7 // This test, and the accompanying lit tests
8 // (dataflow.test, only-some-bytes.test) assume that the compiler
9 // instruments functions in their lexical order.
10 // This assumption is not guaranteed, but it is likely to hold.
11 // It allows to simplify the test quite a bit: in the lit tests
12 // LLVMFuzzerTestOneInput is "F0", Func1 is "F1", Func2 is "F2".
13 #include <assert.h>
14 #include <cstddef>
15 #include <cstdint>
16 #include <cstdlib>
17 #include <cstdio>
18 
19 extern "C" bool Func1(const uint8_t *Data, size_t Size);
20 extern "C" bool Func2(const uint8_t *Data, size_t Size);
21 
22 extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
23   if (Size >= 5
24       && Data[0] == 'F'
25       && Data[1] == 'U'
26       && Data[2] == 'Z'
27       && Data[3] == 'Z'
28       && Func1(Data, Size)
29       && Func2(Data, Size)) {
30         fprintf(stderr, "BINGO\n");
31         abort();
32   }
33   return 0;
34 }
35 
36 extern "C"
37 __attribute__((noinline))
38 bool Func1(const uint8_t *Data, size_t Size) {
39   // assumes Size >= 5, doesn't check it.
40   return Data[4] == 'M';
41 }
42 
43 extern "C"
44 __attribute__((noinline))
45 bool Func2(const uint8_t *Data, size_t Size) {
46   return Size >= 6 && Data[5] == 'E';
47 }
48 
49 
50