//===- FuzzerExtFunctionsWeak.cpp - Interface to external functions -------===// // // 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 // //===----------------------------------------------------------------------===// // Implementation for Linux. This relies on the linker's support for weak // symbols. We don't use this approach on Apple platforms because it requires // clients of LibFuzzer to pass ``-U _<symbol_name>`` to the linker to allow // weak symbols to be undefined. That is a complication we don't want to expose // to clients right now. //===----------------------------------------------------------------------===// #include"FuzzerPlatform.h" #if LIBFUZZER_LINUX || LIBFUZZER_NETBSD || LIBFUZZER_FUCHSIA || \
LIBFUZZER_FREEBSD || LIBFUZZER_OPENBSD || LIBFUZZER_EMSCRIPTEN
extern"C" { // Declare these symbols as weak to allow them to be optionally defined. #define EXT_FUNC(NAME, RETURN_TYPE, FUNC_SIG, WARN) \
__attribute__((weak, visibility("default"))) RETURN_TYPE NAME FUNC_SIG
#include"FuzzerExtFunctions.def"
#undef EXT_FUNC
}
usingnamespace fuzzer;
staticvoid CheckFnPtr(void *FnPtr, constchar *FnName, bool WarnIfMissing) { if (FnPtr == nullptr && WarnIfMissing) {
Printf("WARNING: Failed to find function \"%s\".\n", FnName);
}
}
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