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122 lines
3.8 KiB
122 lines
3.8 KiB
//===- ELFDynObjReader.cpp ------------------------------------------------===//
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//
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// The MCLinker Project
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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 "mcld/LD/ELFDynObjReader.h"
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#include "mcld/IRBuilder.h"
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#include "mcld/LinkerConfig.h"
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#include "mcld/LD/ELFReader.h"
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#include "mcld/LD/LDContext.h"
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#include "mcld/MC/Input.h"
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#include "mcld/Support/MemoryArea.h"
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#include "mcld/Target/GNULDBackend.h"
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#include <llvm/ADT/StringRef.h>
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#include <llvm/ADT/Twine.h>
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#include <llvm/Support/ErrorHandling.h>
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#include <string>
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namespace mcld {
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//===----------------------------------------------------------------------===//
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// ELFDynObjReader
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//===----------------------------------------------------------------------===//
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ELFDynObjReader::ELFDynObjReader(GNULDBackend& pBackend,
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IRBuilder& pBuilder,
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const LinkerConfig& pConfig)
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: DynObjReader(), m_pELFReader(0), m_Builder(pBuilder) {
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if (pConfig.targets().is32Bits() && pConfig.targets().isLittleEndian())
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m_pELFReader = new ELFReader<32, true>(pBackend);
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else if (pConfig.targets().is64Bits() && pConfig.targets().isLittleEndian())
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m_pELFReader = new ELFReader<64, true>(pBackend);
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}
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ELFDynObjReader::~ELFDynObjReader() {
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delete m_pELFReader;
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}
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/// isMyFormat
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bool ELFDynObjReader::isMyFormat(Input& pInput, bool& pContinue) const {
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assert(pInput.hasMemArea());
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// Don't warning about the frequently requests.
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// MemoryArea has a list of cache to handle this.
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size_t hdr_size = m_pELFReader->getELFHeaderSize();
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if (pInput.memArea()->size() < hdr_size)
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return false;
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llvm::StringRef region =
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pInput.memArea()->request(pInput.fileOffset(), hdr_size);
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const char* ELF_hdr = region.begin();
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bool result = true;
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if (!m_pELFReader->isELF(ELF_hdr)) {
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pContinue = true;
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result = false;
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} else if (Input::DynObj != m_pELFReader->fileType(ELF_hdr)) {
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pContinue = true;
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result = false;
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} else if (!m_pELFReader->isMyEndian(ELF_hdr)) {
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pContinue = false;
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result = false;
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} else if (!m_pELFReader->isMyMachine(ELF_hdr)) {
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pContinue = false;
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result = false;
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}
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return result;
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}
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/// readHeader
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bool ELFDynObjReader::readHeader(Input& pInput) {
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assert(pInput.hasMemArea());
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size_t hdr_size = m_pELFReader->getELFHeaderSize();
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llvm::StringRef region =
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pInput.memArea()->request(pInput.fileOffset(), hdr_size);
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const char* ELF_hdr = region.begin();
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bool shdr_result = m_pELFReader->readSectionHeaders(pInput, ELF_hdr);
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// read .dynamic to get the correct SONAME
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bool dyn_result = m_pELFReader->readDynamic(pInput);
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return (shdr_result && dyn_result);
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}
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/// readSymbols
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bool ELFDynObjReader::readSymbols(Input& pInput) {
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assert(pInput.hasMemArea());
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LDSection* symtab_shdr = pInput.context()->getSection(".dynsym");
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if (symtab_shdr == NULL) {
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note(diag::note_has_no_symtab) << pInput.name() << pInput.path()
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<< ".dynsym";
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return true;
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}
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LDSection* strtab_shdr = symtab_shdr->getLink();
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if (strtab_shdr == NULL) {
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fatal(diag::fatal_cannot_read_strtab) << pInput.name() << pInput.path()
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<< ".dynsym";
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return false;
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}
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llvm::StringRef symtab_region = pInput.memArea()->request(
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pInput.fileOffset() + symtab_shdr->offset(), symtab_shdr->size());
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llvm::StringRef strtab_region = pInput.memArea()->request(
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pInput.fileOffset() + strtab_shdr->offset(), strtab_shdr->size());
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const char* strtab = strtab_region.begin();
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bool result =
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m_pELFReader->readSymbols(pInput, m_Builder, symtab_region, strtab);
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return result;
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}
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} // namespace mcld
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