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49 lines
1.6 KiB
49 lines
1.6 KiB
//===- 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 "FuzzerDefs.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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