llvm/lib/Fuzzer/FuzzerExtFunctionsDlsym.cpp
Marcos Pividori f51c50474c [libFuzzer] Clean up headers and file formatting of LibFuzzer files.
Reorganize #includes to follow LLVM Coding Standards.
Include some missing headers. Required to use `Printf()`.

Aside from that, this patch contains no functional change.
It is purely a re-organization.

Differential Revision: https://reviews.llvm.org/D27363

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@289560 91177308-0d34-0410-b5e6-96231b3b80d8
2016-12-13 17:46:11 +00:00

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1.6 KiB
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//===- 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 "FuzzerDefs.h"
#if LIBFUZZER_APPLE
#include "FuzzerExtFunctions.h"
#include "FuzzerIO.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