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50 lines
1.7 KiB
50 lines
1.7 KiB
//===- 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 |
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#include "FuzzerExtFunctions.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((void *)::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_LINUX
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