llvm/lib/Fuzzer/FuzzerExtFunctionsWeak.cpp
Kostya Serebryany e52f15bf1a [libFuzzer] more refactoring
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@282113 91177308-0d34-0410-b5e6-96231b3b80d8
2016-09-21 21:17:23 +00:00

51 lines
1.7 KiB
C++

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