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31f0f659a8
Follow up for D53051 This patch introduces the tool associated with the ELF implementation of TextAPI (previously llvm-tapi, renamed for better distinction). This tool will house a number of features related to enalysis and manipulation of shared object's exposed interfaces. The first major feature for this tool is support for producing binary stubs that are useful for compile-time linking of shared objects. This patch introduces beginnings of support for reading binary ELF objects to work towards that goal. Added: - elfabi tool. - support for reading architecture from a binary ELF file into an ELFStub. - Support for writing .tbe files. Differential Revision: https://reviews.llvm.org/D55352 llvm-svn: 350341
69 lines
2.2 KiB
C++
69 lines
2.2 KiB
C++
//===- ELFObjHandler.cpp --------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===-----------------------------------------------------------------------===/
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#include "ELFObjHandler.h"
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#include "llvm/Object/Binary.h"
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#include "llvm/Object/ELFObjectFile.h"
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#include "llvm/Object/ELFTypes.h"
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#include "llvm/Support/Errc.h"
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#include "llvm/Support/Error.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/TextAPI/ELF/ELFStub.h"
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using llvm::MemoryBufferRef;
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using llvm::object::ELFObjectFile;
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using namespace llvm;
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using namespace llvm::object;
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using namespace llvm::elfabi;
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using namespace llvm::ELF;
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namespace llvm {
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namespace elfabi {
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/// Returns a new ELFStub with all members populated from an ELFObjectFile.
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/// @param ElfObj Source ELFObjectFile.
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template <class ELFT>
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Expected<std::unique_ptr<ELFStub>>
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buildStub(const ELFObjectFile<ELFT> &ElfObj) {
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std::unique_ptr<ELFStub> DestStub = make_unique<ELFStub>();
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const ELFFile<ELFT> *ElfFile = ElfObj.getELFFile();
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DestStub->Arch = ElfFile->getHeader()->e_machine;
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// TODO: Populate SoName from .dynamic entries and linked string table.
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// TODO: Populate NeededLibs from .dynamic entries and linked string table.
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// TODO: Populate Symbols from .dynsym table and linked string table.
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return std::move(DestStub);
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}
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Expected<std::unique_ptr<ELFStub>> readELFFile(MemoryBufferRef Buf) {
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Expected<std::unique_ptr<Binary>> BinOrErr = createBinary(Buf);
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if (!BinOrErr) {
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return BinOrErr.takeError();
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}
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Binary *Bin = BinOrErr->get();
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if (auto Obj = dyn_cast<ELFObjectFile<ELF32LE>>(Bin)) {
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return buildStub(*Obj);
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} else if (auto Obj = dyn_cast<ELFObjectFile<ELF64LE>>(Bin)) {
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return buildStub(*Obj);
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} else if (auto Obj = dyn_cast<ELFObjectFile<ELF32BE>>(Bin)) {
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return buildStub(*Obj);
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} else if (auto Obj = dyn_cast<ELFObjectFile<ELF64BE>>(Bin)) {
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return buildStub(*Obj);
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}
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return createStringError(errc::not_supported, "Unsupported binary format");
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}
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} // end namespace elfabi
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} // end namespace llvm
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