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//=== FuzzerExtWindows.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 of FuzzerExtFunctions for Windows. Uses alternatename when
// compiled with MSVC. Uses weak aliases when compiled with clang. Unfortunately
// the method each compiler supports is not supported by the other.
//===----------------------------------------------------------------------===//
#include "FuzzerPlatform.h"
#if LIBFUZZER_WINDOWS
#include "FuzzerExtFunctions.h"
#include "FuzzerIO.h"
#include <stdlib.h>
using namespace fuzzer;
// Intermediate macro to ensure the parameter is expanded before stringified.
#define STRINGIFY_(A) #A
#define STRINGIFY(A) STRINGIFY_(A)
#if LIBFUZZER_MSVC
#define GET_FUNCTION_ADDRESS(fn) &fn
#else
#define GET_FUNCTION_ADDRESS(fn) __builtin_function_start(fn)
#endif // LIBFUZER_MSVC
// Copied from compiler-rt/lib/sanitizer_common/sanitizer_win_defs.h
#if defined(_M_IX86) || defined(__i386__)
#define WIN_SYM_PREFIX "_"
#else
#define WIN_SYM_PREFIX
#endif
// Declare external functions as having alternativenames, so that we can
// determine if they are not defined.
#define EXTERNAL_FUNC(Name, Default) \
__pragma(comment(linker, "/alternatename:" WIN_SYM_PREFIX STRINGIFY( \
Name) "=" WIN_SYM_PREFIX STRINGIFY(Default)))
extern "C" {
#define EXT_FUNC(NAME, RETURN_TYPE, FUNC_SIG, WARN) \
RETURN_TYPE NAME##Def FUNC_SIG { \
Printf("ERROR: Function \"%s\" not defined.\n", #NAME); \
exit(1); \
} \
EXTERNAL_FUNC(NAME, NAME##Def) RETURN_TYPE NAME FUNC_SIG
#include "FuzzerExtFunctions.def"
#undef EXT_FUNC
}
template <typename T>
static T *GetFnPtr(void *Fun, void *FunDef, const char *FnName,
bool WarnIfMissing) {
if (Fun == FunDef) {
if (WarnIfMissing)
Printf("WARNING: Failed to find function \"%s\".\n", FnName);
return nullptr;
}
return (T *)Fun;
}
namespace fuzzer {
ExternalFunctions::ExternalFunctions() {
#define EXT_FUNC(NAME, RETURN_TYPE, FUNC_SIG, WARN) \
this->NAME = GetFnPtr<decltype(::NAME)>(GET_FUNCTION_ADDRESS(::NAME), \
GET_FUNCTION_ADDRESS(::NAME##Def), \
#NAME, WARN);
#include "FuzzerExtFunctions.def"
#undef EXT_FUNC
}
} // namespace fuzzer
#endif // LIBFUZZER_WINDOWS
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