You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
55 lines
1.9 KiB
55 lines
1.9 KiB
//===- 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_EMSCRIPTEN
|
|
|
|
#include "FuzzerExtFunctions.h"
|
|
#include "FuzzerIO.h"
|
|
|
|
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
|
|
}
|
|
|
|
using namespace fuzzer;
|
|
|
|
static void CheckFnPtr(void *FnPtr, const char *FnName, bool WarnIfMissing) {
|
|
if (FnPtr == nullptr && WarnIfMissing) {
|
|
Printf("WARNING: Failed to find function \"%s\".\n", FnName);
|
|
}
|
|
}
|
|
|
|
namespace fuzzer {
|
|
|
|
ExternalFunctions::ExternalFunctions() {
|
|
#define EXT_FUNC(NAME, RETURN_TYPE, FUNC_SIG, WARN) \
|
|
this->NAME = ::NAME; \
|
|
CheckFnPtr(reinterpret_cast<void *>(reinterpret_cast<uintptr_t>(::NAME)), \
|
|
#NAME, WARN);
|
|
|
|
#include "FuzzerExtFunctions.def"
|
|
|
|
#undef EXT_FUNC
|
|
}
|
|
|
|
} // namespace fuzzer
|
|
|
|
#endif
|