mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-10-25 05:52:53 +02:00
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 ------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
// Implementation for operating systems that support dlsym(). We only use it on
|
|
// Apple platforms for now. We don't use this approach on Linux because it
|
|
// requires that clients of LibFuzzer pass ``--export-dynamic`` to the linker.
|
|
// That is a complication we don't wish to expose to clients right now.
|
|
//===----------------------------------------------------------------------===//
|
|
#include "FuzzerInternal.h"
|
|
#if LIBFUZZER_APPLE
|
|
|
|
#include "FuzzerExtFunctions.h"
|
|
#include <dlfcn.h>
|
|
|
|
using namespace fuzzer;
|
|
|
|
template <typename T>
|
|
static T GetFnPtr(const char *FnName, bool WarnIfMissing) {
|
|
dlerror(); // Clear any previous errors.
|
|
void *Fn = dlsym(RTLD_DEFAULT, FnName);
|
|
if (Fn == nullptr) {
|
|
if (WarnIfMissing) {
|
|
const char *ErrorMsg = dlerror();
|
|
Printf("WARNING: Failed to find function \"%s\".", FnName);
|
|
if (ErrorMsg)
|
|
Printf(" Reason %s.", ErrorMsg);
|
|
Printf("\n");
|
|
}
|
|
}
|
|
return reinterpret_cast<T>(Fn);
|
|
}
|
|
|
|
namespace fuzzer {
|
|
|
|
ExternalFunctions::ExternalFunctions() {
|
|
#define EXT_FUNC(NAME, RETURN_TYPE, FUNC_SIG, WARN) \
|
|
this->NAME = GetFnPtr<decltype(ExternalFunctions::NAME)>(#NAME, WARN)
|
|
|
|
#include "FuzzerExtFunctions.def"
|
|
|
|
#undef EXT_FUNC
|
|
}
|
|
} // namespace fuzzer
|
|
#endif // LIBFUZZER_APPLE
|