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8b5c81728c
The motivation for this change is to fix linking issues on OSX. However this only partially fixes linking issues (the uninstrumented tests and a few others won't succesfully link yet). This change introduces a struct of function pointers (``fuzzer::ExternalFuntions``) which when initialised will point to the optional functions if they are available. Currently these ``LLVMFuzzerInitialize`` and ``LLVMFuzzerCustomMutator`` functions. Two implementations of ``fuzzer::ExternalFunctions`` constructor are provided one for Linux and one for OSX. The OSX implementation uses ``dlsym()`` because the prior implementation using weak symbols does not work unless the additional flags are passed to the linker. The Linux implementation continues to use weak symbols because the ``dlsym()`` approach does not work unless additional flags are passed to the linker. Differential Revision: http://reviews.llvm.org/D20741 llvm-svn: 271491
50 lines
1.6 KiB
C++
50 lines
1.6 KiB
C++
//===- FuzzerExtFunctionsDlsym.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 operating systems that support dlsym(). We only use it on
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// Apple platforms for now. We don't use this approach on Linux because it
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// requires that clients of LibFuzzer pass ``--export-dynamic`` to the linker.
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// That is a complication we don't wish to expose to clients right now.
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//===----------------------------------------------------------------------===//
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#include "FuzzerInternal.h"
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#if LIBFUZZER_APPLE
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#include "FuzzerExtFunctions.h"
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#include <dlfcn.h>
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using namespace fuzzer;
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template <typename T>
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static T GetFnPtr(const char *FnName, bool WarnIfMissing) {
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dlerror(); // Clear any previous errors.
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void *Fn = dlsym(RTLD_DEFAULT, FnName);
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if (Fn == nullptr) {
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if (WarnIfMissing) {
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const char *ErrorMsg = dlerror();
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Printf("WARNING: Failed to find function \"%s\".", FnName);
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if (ErrorMsg)
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Printf(" Reason %s.", ErrorMsg);
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Printf("\n");
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}
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}
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return reinterpret_cast<T>(Fn);
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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(ExternalFunctions::NAME)>(#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_APPLE
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