72 lines
2.5 KiB
C++
72 lines
2.5 KiB
C++
//===------ EPCEHFrameRegistrar.cpp - EPC-based eh-frame registration -----===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/ExecutionEngine/Orc/EPCEHFrameRegistrar.h"
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#include "llvm/ExecutionEngine/Orc/Core.h"
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#include "llvm/Support/BinaryStreamWriter.h"
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using namespace llvm::orc::shared;
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namespace llvm {
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namespace orc {
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Expected<std::unique_ptr<EPCEHFrameRegistrar>>
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EPCEHFrameRegistrar::Create(ExecutionSession &ES) {
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// FIXME: Proper mangling here -- we really need to decouple linker mangling
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// from DataLayout.
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// Find the addresses of the registration/deregistration functions in the
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// executor process.
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auto &EPC = ES.getExecutorProcessControl();
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auto ProcessHandle = EPC.loadDylib(nullptr);
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if (!ProcessHandle)
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return ProcessHandle.takeError();
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std::string RegisterWrapperName, DeregisterWrapperName;
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if (EPC.getTargetTriple().isOSBinFormatMachO()) {
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RegisterWrapperName += '_';
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DeregisterWrapperName += '_';
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}
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RegisterWrapperName += "llvm_orc_registerEHFrameSectionWrapper";
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DeregisterWrapperName += "llvm_orc_deregisterEHFrameSectionWrapper";
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SymbolLookupSet RegistrationSymbols;
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RegistrationSymbols.add(EPC.intern(RegisterWrapperName));
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RegistrationSymbols.add(EPC.intern(DeregisterWrapperName));
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auto Result = EPC.lookupSymbols({{*ProcessHandle, RegistrationSymbols}});
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if (!Result)
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return Result.takeError();
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assert(Result->size() == 1 && "Unexpected number of dylibs in result");
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assert((*Result)[0].size() == 2 &&
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"Unexpected number of addresses in result");
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auto RegisterEHFrameWrapperFnAddr = (*Result)[0][0];
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auto DeregisterEHFrameWrapperFnAddr = (*Result)[0][1];
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return std::make_unique<EPCEHFrameRegistrar>(
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ES, ExecutorAddr(RegisterEHFrameWrapperFnAddr),
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ExecutorAddr(DeregisterEHFrameWrapperFnAddr));
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}
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Error EPCEHFrameRegistrar::registerEHFrames(ExecutorAddrRange EHFrameSection) {
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return ES.callSPSWrapper<void(SPSExecutorAddrRange)>(
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RegisterEHFrameWrapperFnAddr, EHFrameSection);
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}
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Error EPCEHFrameRegistrar::deregisterEHFrames(
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ExecutorAddrRange EHFrameSection) {
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return ES.callSPSWrapper<void(SPSExecutorAddrRange)>(
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DeregisterEHFrameWrapperFnAddr, EHFrameSection);
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}
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} // end namespace orc
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} // end namespace llvm
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