1 //===- FuzzerInterface.h - Interface header for the Fuzzer ------*- C++ -* ===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
9 // Define the interface between libFuzzer and the library being tested.
10 //===----------------------------------------------------------------------===//
12 // NOTE: the libFuzzer interface is thin and in the majority of cases
13 // you should not include this file into your target. In 95% of cases
14 // all you need is to define the following function in your file:
15 // extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size);
17 // WARNING: keep the interface in C.
19 #ifndef LLVM_FUZZER_INTERFACE_H
20 #define LLVM_FUZZER_INTERFACE_H
29 // Mandatory user-provided target function.
30 // Executes the code under test with [Data, Data+Size) as the input.
31 // libFuzzer will invoke this function *many* times with different inputs.
33 __attribute__((visibility("default"))) int
34 LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size);
36 // Optional user-provided initialization function.
37 // If provided, this function will be called by libFuzzer once at startup.
38 // It may read and modify argc/argv.
40 __attribute__((visibility("default"))) int LLVMFuzzerInitialize(int *argc,
43 // Optional user-provided custom mutator.
44 // Mutates raw data in [Data, Data+Size) inplace.
45 // Returns the new size, which is not greater than MaxSize.
46 // Given the same Seed produces the same mutation.
47 __attribute__((visibility("default"))) size_t
48 LLVMFuzzerCustomMutator(uint8_t *Data, size_t Size, size_t MaxSize,
51 // Optional user-provided custom cross-over function.
52 // Combines pieces of Data1 & Data2 together into Out.
53 // Returns the new size, which is not greater than MaxOutSize.
54 // Should produce the same mutation given the same Seed.
55 __attribute__((visibility("default"))) size_t
56 LLVMFuzzerCustomCrossOver(const uint8_t *Data1, size_t Size1,
57 const uint8_t *Data2, size_t Size2, uint8_t *Out,
58 size_t MaxOutSize, unsigned int Seed);
60 // Experimental, may go away in future.
61 // libFuzzer-provided function to be used inside LLVMFuzzerCustomMutator.
62 // Mutates raw data in [Data, Data+Size) inplace.
63 // Returns the new size, which is not greater than MaxSize.
64 __attribute__((visibility("default"))) size_t
65 LLVMFuzzerMutate(uint8_t *Data, size_t Size, size_t MaxSize);
71 #endif // LLVM_FUZZER_INTERFACE_H