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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
83 lines
2.8 KiB
C++
83 lines
2.8 KiB
C++
//=== FuzzerExtWindows.cpp - Interface to external functions --------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// Implementation of FuzzerExtFunctions for Windows. Uses alternatename when
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// compiled with MSVC. Uses weak aliases when compiled with clang. Unfortunately
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// the method each compiler supports is not supported by the other.
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//===----------------------------------------------------------------------===//
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#include "FuzzerDefs.h"
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#if LIBFUZZER_WINDOWS
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#include "FuzzerExtFunctions.h"
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#include "FuzzerIO.h"
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using namespace fuzzer;
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// Intermediate macro to ensure the parameter is expanded before stringified.
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#define STRINGIFY_(A) #A
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#define STRINGIFY(A) STRINGIFY_(A)
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#if LIBFUZZER_MSVC
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// Copied from compiler-rt/lib/sanitizer_common/sanitizer_win_defs.h
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#if defined(_M_IX86) || defined(__i386__)
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#define WIN_SYM_PREFIX "_"
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#else
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#define WIN_SYM_PREFIX
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#endif
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// Declare external functions as having alternativenames, so that we can
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// determine if they are not defined.
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#define EXTERNAL_FUNC(Name, Default) \
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__pragma(comment(linker, "/alternatename:" WIN_SYM_PREFIX STRINGIFY( \
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Name) "=" WIN_SYM_PREFIX STRINGIFY(Default)))
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#else
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// Declare external functions as weak to allow them to default to a specified
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// function if not defined explicitly. We must use weak symbols because clang's
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// support for alternatename is not 100%, see
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// https://bugs.llvm.org/show_bug.cgi?id=40218 for more details.
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#define EXTERNAL_FUNC(Name, Default) \
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__attribute__((weak, alias(STRINGIFY(Default))))
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#endif // LIBFUZZER_MSVC
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extern "C" {
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#define EXT_FUNC(NAME, RETURN_TYPE, FUNC_SIG, WARN) \
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RETURN_TYPE NAME##Def FUNC_SIG { \
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Printf("ERROR: Function \"%s\" not defined.\n", #NAME); \
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exit(1); \
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} \
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EXTERNAL_FUNC(NAME, NAME##Def) RETURN_TYPE NAME FUNC_SIG;
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#include "FuzzerExtFunctions.def"
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#undef EXT_FUNC
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}
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template <typename T>
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static T *GetFnPtr(T *Fun, T *FunDef, const char *FnName, bool WarnIfMissing) {
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if (Fun == FunDef) {
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if (WarnIfMissing)
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Printf("WARNING: Failed to find function \"%s\".\n", FnName);
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return nullptr;
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}
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return Fun;
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}
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namespace fuzzer {
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ExternalFunctions::ExternalFunctions() {
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#define EXT_FUNC(NAME, RETURN_TYPE, FUNC_SIG, WARN) \
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this->NAME = GetFnPtr<decltype(::NAME)>(::NAME, ::NAME##Def, #NAME, WARN);
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#include "FuzzerExtFunctions.def"
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#undef EXT_FUNC
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}
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} // namespace fuzzer
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#endif // LIBFUZZER_WINDOWS
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