81 lines
3.1 KiB
C++
81 lines
3.1 KiB
C++
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//===------ TPCEHFrameRegistrar.cpp - TPC-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/TPCEHFrameRegistrar.h"
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#include "llvm/Support/BinaryStreamWriter.h"
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namespace llvm {
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namespace orc {
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Expected<std::unique_ptr<TPCEHFrameRegistrar>>
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TPCEHFrameRegistrar::Create(TargetProcessControl &TPC) {
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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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// target process.
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auto ProcessHandle = TPC.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 (TPC.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(TPC.intern(RegisterWrapperName));
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RegistrationSymbols.add(TPC.intern(DeregisterWrapperName));
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auto Result = TPC.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<TPCEHFrameRegistrar>(
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TPC, RegisterEHFrameWrapperFnAddr, DeregisterEHFrameWrapperFnAddr);
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}
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Error TPCEHFrameRegistrar::registerEHFrames(JITTargetAddress EHFrameSectionAddr,
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size_t EHFrameSectionSize) {
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constexpr size_t ArgBufferSize = sizeof(uint64_t) + sizeof(uint64_t);
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uint8_t ArgBuffer[ArgBufferSize];
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BinaryStreamWriter ArgWriter(
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MutableArrayRef<uint8_t>(ArgBuffer, ArgBufferSize),
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support::endianness::big);
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cantFail(ArgWriter.writeInteger(static_cast<uint64_t>(EHFrameSectionAddr)));
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cantFail(ArgWriter.writeInteger(static_cast<uint64_t>(EHFrameSectionSize)));
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return TPC.runWrapper(RegisterEHFrameWrapperFnAddr, ArgBuffer).takeError();
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}
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Error TPCEHFrameRegistrar::deregisterEHFrames(
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JITTargetAddress EHFrameSectionAddr, size_t EHFrameSectionSize) {
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constexpr size_t ArgBufferSize = sizeof(uint64_t) + sizeof(uint64_t);
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uint8_t ArgBuffer[ArgBufferSize];
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BinaryStreamWriter ArgWriter(
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MutableArrayRef<uint8_t>(ArgBuffer, ArgBufferSize),
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support::endianness::big);
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cantFail(ArgWriter.writeInteger(static_cast<uint64_t>(EHFrameSectionAddr)));
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cantFail(ArgWriter.writeInteger(static_cast<uint64_t>(EHFrameSectionSize)));
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return TPC.runWrapper(DeregisterEHFrameWrapperFnAddr, ArgBuffer).takeError();
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}
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} // end namespace orc
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} // end namespace llvm
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