55 lines
1.8 KiB
C++
55 lines
1.8 KiB
C++
//===- FuzzerExtFunctionsWeak.cpp - Interface to external functions -------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// Implementation for Linux. This relies on the linker's support for weak
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// symbols. We don't use this approach on Apple platforms because it requires
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// clients of LibFuzzer to pass ``-U _<symbol_name>`` to the linker to allow
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// weak symbols to be undefined. That is a complication we don't want to expose
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// to clients right now.
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//===----------------------------------------------------------------------===//
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#include "FuzzerDefs.h"
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#if LIBFUZZER_LINUX || LIBFUZZER_NETBSD
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#include "FuzzerExtFunctions.h"
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#include "FuzzerIO.h"
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extern "C" {
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// Declare these symbols as weak to allow them to be optionally defined.
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#define EXT_FUNC(NAME, RETURN_TYPE, FUNC_SIG, WARN) \
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__attribute__((weak)) 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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using namespace fuzzer;
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static void CheckFnPtr(void *FnPtr, const char *FnName, bool WarnIfMissing) {
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if (FnPtr == nullptr && WarnIfMissing) {
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Printf("WARNING: Failed to find function \"%s\".\n", FnName);
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}
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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 = ::NAME; \
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CheckFnPtr(reinterpret_cast<void *>(reinterpret_cast<uintptr_t>(::NAME)), \
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#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_LINUX || LIBFUZZER_NETBSD
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