mirror of
https://github.com/RPCSX/llvm.git
synced 2024-12-23 04:28:40 +00:00
a6ae0e2562
Windows doesn't really support weak aliases, but with some linker magic we can get something that's pretty close on Windows. This introduces an interface to accessing weakly aliased symbols that will work on any platform. Linker magic changes to come in a separate patch. Patch by Marcos Pividori Differential Revision: https://reviews.llvm.org/D27235 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@288530 91177308-0d34-0410-b5e6-96231b3b80d8
55 lines
1.8 KiB
C++
55 lines
1.8 KiB
C++
//===- FuzzerExtFunctionsWeakAlias.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 using weak aliases. Works for Windows.
|
|
//===----------------------------------------------------------------------===//
|
|
#include "FuzzerDefs.h"
|
|
#if LIBFUZZER_WINDOWS
|
|
|
|
#include "FuzzerExtFunctions.h"
|
|
#include "FuzzerIO.h"
|
|
|
|
using namespace fuzzer;
|
|
|
|
extern "C" {
|
|
// Declare these symbols as weak to allow them to be optionally defined.
|
|
#define EXT_FUNC(NAME, RETURN_TYPE, FUNC_SIG, WARN) \
|
|
RETURN_TYPE NAME##Def FUNC_SIG { \
|
|
Printf("ERROR: Function \"%s\" not defined.\n", #NAME); \
|
|
exit(1); \
|
|
} \
|
|
RETURN_TYPE NAME FUNC_SIG __attribute__((weak, alias(#NAME "Def")));
|
|
|
|
#include "FuzzerExtFunctions.def"
|
|
|
|
#undef EXT_FUNC
|
|
}
|
|
|
|
template <typename T>
|
|
static T *GetFnPtr(T *Fun, T *FunDef, const char *FnName, bool WarnIfMissing) {
|
|
if (Fun == FunDef) {
|
|
if (WarnIfMissing)
|
|
Printf("WARNING: Failed to find function \"%s\".\n", FnName);
|
|
return nullptr;
|
|
}
|
|
return Fun;
|
|
}
|
|
|
|
namespace fuzzer {
|
|
|
|
ExternalFunctions::ExternalFunctions() {
|
|
#define EXT_FUNC(NAME, RETURN_TYPE, FUNC_SIG, WARN) \
|
|
this->NAME = GetFnPtr<decltype(::NAME)>(::NAME, ::NAME##Def, #NAME, WARN);
|
|
|
|
#include "FuzzerExtFunctions.def"
|
|
|
|
#undef EXT_FUNC
|
|
}
|
|
} // namespace fuzzer
|
|
#endif // LIBFUZZER_WINDOWS
|