forked from OSchip/llvm-project
74 lines
2.7 KiB
C++
74 lines
2.7 KiB
C++
//===------ EPCEHFrameRegistrar.cpp - EPC-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/EPCEHFrameRegistrar.h"
|
|
|
|
#include "llvm/ExecutionEngine/Orc/Core.h"
|
|
#include "llvm/Support/BinaryStreamWriter.h"
|
|
|
|
using namespace llvm::orc::shared;
|
|
|
|
namespace llvm {
|
|
namespace orc {
|
|
|
|
Expected<std::unique_ptr<EPCEHFrameRegistrar>>
|
|
EPCEHFrameRegistrar::Create(ExecutionSession &ES) {
|
|
// FIXME: Proper mangling here -- we really need to decouple linker mangling
|
|
// from DataLayout.
|
|
|
|
// Find the addresses of the registration/deregistration functions in the
|
|
// executor process.
|
|
auto &EPC = ES.getExecutorProcessControl();
|
|
auto ProcessHandle = EPC.loadDylib(nullptr);
|
|
if (!ProcessHandle)
|
|
return ProcessHandle.takeError();
|
|
|
|
std::string RegisterWrapperName, DeregisterWrapperName;
|
|
if (EPC.getTargetTriple().isOSBinFormatMachO()) {
|
|
RegisterWrapperName += '_';
|
|
DeregisterWrapperName += '_';
|
|
}
|
|
RegisterWrapperName += "llvm_orc_registerEHFrameSectionWrapper";
|
|
DeregisterWrapperName += "llvm_orc_deregisterEHFrameSectionWrapper";
|
|
|
|
SymbolLookupSet RegistrationSymbols;
|
|
RegistrationSymbols.add(EPC.intern(RegisterWrapperName));
|
|
RegistrationSymbols.add(EPC.intern(DeregisterWrapperName));
|
|
|
|
auto Result = EPC.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<EPCEHFrameRegistrar>(ES, RegisterEHFrameWrapperFnAddr,
|
|
DeregisterEHFrameWrapperFnAddr);
|
|
}
|
|
|
|
Error EPCEHFrameRegistrar::registerEHFrames(JITTargetAddress EHFrameSectionAddr,
|
|
size_t EHFrameSectionSize) {
|
|
return ES.callSPSWrapper<void(SPSExecutorAddress, uint64_t)>(
|
|
RegisterEHFrameWrapperFnAddr, EHFrameSectionAddr,
|
|
static_cast<uint64_t>(EHFrameSectionSize));
|
|
}
|
|
|
|
Error EPCEHFrameRegistrar::deregisterEHFrames(
|
|
JITTargetAddress EHFrameSectionAddr, size_t EHFrameSectionSize) {
|
|
return ES.callSPSWrapper<void(SPSExecutorAddress, uint64_t)>(
|
|
DeregisterEHFrameWrapperFnAddr, EHFrameSectionAddr,
|
|
static_cast<uint64_t>(EHFrameSectionSize));
|
|
}
|
|
|
|
} // end namespace orc
|
|
} // end namespace llvm
|