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//===------ TPCEHFrameRegistrar.cpp - TPC-based eh-frame registration -----===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "llvm/ExecutionEngine/Orc/TPCEHFrameRegistrar.h"
#include "llvm/Support/BinaryStreamWriter.h"
namespace llvm {
namespace orc {
Expected<std::unique_ptr<TPCEHFrameRegistrar>>
TPCEHFrameRegistrar::Create(TargetProcessControl &TPC) {
// FIXME: Proper mangling here -- we really need to decouple linker mangling
// from DataLayout.
// Find the addresses of the registration/deregistration functions in the
// target process.
auto ProcessHandle = TPC.loadDylib(nullptr);
if (!ProcessHandle)
return ProcessHandle.takeError();
std::string RegisterWrapperName, DeregisterWrapperName;
if (TPC.getTargetTriple().isOSBinFormatMachO()) {
RegisterWrapperName += '_';
DeregisterWrapperName += '_';
}
RegisterWrapperName += "llvm_orc_registerEHFrameSectionWrapper";
DeregisterWrapperName += "llvm_orc_deregisterEHFrameSectionWrapper";
SymbolLookupSet RegistrationSymbols;
RegistrationSymbols.add(TPC.intern(RegisterWrapperName));
RegistrationSymbols.add(TPC.intern(DeregisterWrapperName));
auto Result = TPC.lookupSymbols({{*ProcessHandle, RegistrationSymbols}});
if (!Result)
return Result.takeError();
assert(Result->size() == 1 && "Unexpected number of dylibs in result");
assert((*Result)[0].size() == 2 &&
"Unexpected number of addresses in result");
auto RegisterEHFrameWrapperFnAddr = (*Result)[0][0];
auto DeregisterEHFrameWrapperFnAddr = (*Result)[0][1];
return std::make_unique<TPCEHFrameRegistrar>(
TPC, RegisterEHFrameWrapperFnAddr, DeregisterEHFrameWrapperFnAddr);
}
Error TPCEHFrameRegistrar::registerEHFrames(JITTargetAddress EHFrameSectionAddr,
size_t EHFrameSectionSize) {
constexpr size_t ArgBufferSize = sizeof(uint64_t) + sizeof(uint64_t);
uint8_t ArgBuffer[ArgBufferSize];
BinaryStreamWriter ArgWriter(
MutableArrayRef<uint8_t>(ArgBuffer, ArgBufferSize),
support::endianness::big);
cantFail(ArgWriter.writeInteger(static_cast<uint64_t>(EHFrameSectionAddr)));
cantFail(ArgWriter.writeInteger(static_cast<uint64_t>(EHFrameSectionSize)));
return TPC.runWrapper(RegisterEHFrameWrapperFnAddr, ArgBuffer).takeError();
}
Error TPCEHFrameRegistrar::deregisterEHFrames(
JITTargetAddress EHFrameSectionAddr, size_t EHFrameSectionSize) {
constexpr size_t ArgBufferSize = sizeof(uint64_t) + sizeof(uint64_t);
uint8_t ArgBuffer[ArgBufferSize];
BinaryStreamWriter ArgWriter(
MutableArrayRef<uint8_t>(ArgBuffer, ArgBufferSize),
support::endianness::big);
cantFail(ArgWriter.writeInteger(static_cast<uint64_t>(EHFrameSectionAddr)));
cantFail(ArgWriter.writeInteger(static_cast<uint64_t>(EHFrameSectionSize)));
return TPC.runWrapper(DeregisterEHFrameWrapperFnAddr, ArgBuffer).takeError();
}
} // end namespace orc
} // end namespace llvm
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