//===- FuzzerInterface.h - Interface header for the Fuzzer ------*- C++ -* ===// // // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. // See https://llvm.org/LICENSE.txt for license information. // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception // //===----------------------------------------------------------------------===// // Define the interface between libFuzzer and the library being tested. //===----------------------------------------------------------------------===//
// NOTE: the libFuzzer interface is thin and in the majority of cases // you should not include this file into your target. In 95% of cases // all you need is to define the following function in your file: // extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size);
// Define FUZZER_INTERFACE_VISIBILITY to set default visibility in a way that // doesn't break MSVC. #ifdefined(_WIN32) #define FUZZER_INTERFACE_VISIBILITY __declspec(dllexport) #else #define FUZZER_INTERFACE_VISIBILITY __attribute__((visibility("default"))) #endif
// Mandatory user-provided target function. // Executes the code under test with [Data, Data+Size) as the input. // libFuzzer will invoke this function *many* times with different inputs. // Must return 0.
FUZZER_INTERFACE_VISIBILITY int
LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size);
// Optional user-provided initialization function. // If provided, this function will be called by libFuzzer once at startup. // It may read and modify argc/argv. // Must return 0.
FUZZER_INTERFACE_VISIBILITY int LLVMFuzzerInitialize(int *argc, char ***argv);
// Optional user-provided custom mutator. // Mutates raw data in [Data, Data+Size) inplace. // Returns the new size, which is not greater than MaxSize. // Given the same Seed produces the same mutation.
FUZZER_INTERFACE_VISIBILITY size_t
LLVMFuzzerCustomMutator(uint8_t *Data, size_t Size, size_t MaxSize, unsignedint Seed);
// Optional user-provided custom cross-over function. // Combines pieces of Data1 & Data2 together into Out. // Returns the new size, which is not greater than MaxOutSize. // Should produce the same mutation given the same Seed.
FUZZER_INTERFACE_VISIBILITY size_t
LLVMFuzzerCustomCrossOver(const uint8_t *Data1, size_t Size1, const uint8_t *Data2, size_t Size2, uint8_t *Out,
size_t MaxOutSize, unsignedint Seed);
// Experimental, may go away in future. // libFuzzer-provided function to be used inside LLVMFuzzerCustomMutator. // Mutates raw data in [Data, Data+Size) inplace. // Returns the new size, which is not greater than MaxSize.
FUZZER_INTERFACE_VISIBILITY size_t
LLVMFuzzerMutate(uint8_t *Data, size_t Size, size_t MaxSize);
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