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//===------ 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, ExecutorAddr(RegisterEHFrameWrapperFnAddr),
ExecutorAddr(DeregisterEHFrameWrapperFnAddr));
}
Error EPCEHFrameRegistrar::registerEHFrames(ExecutorAddrRange EHFrameSection) {
return ES.callSPSWrapper<void(SPSExecutorAddrRange)>(
RegisterEHFrameWrapperFnAddr, EHFrameSection);
}
Error EPCEHFrameRegistrar::deregisterEHFrames(
ExecutorAddrRange EHFrameSection) {
return ES.callSPSWrapper<void(SPSExecutorAddrRange)>(
DeregisterEHFrameWrapperFnAddr, EHFrameSection);
}
} // end namespace orc
} // end namespace llvm
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