122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao//===- ObjectLinker.cpp ---------------------------------------------------===// 222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao// 322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao// The MCLinker Project 422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao// 522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao// This file is distributed under the University of Illinois Open Source 622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao// License. See LICENSE.TXT for details. 722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao// 822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao//===----------------------------------------------------------------------===// 922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao#include <mcld/Object/ObjectLinker.h> 1022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 1122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao#include <mcld/LinkerConfig.h> 1222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao#include <mcld/Module.h> 1322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao#include <mcld/InputTree.h> 14d0fbbb227051be16931a1aa9b4a7722ac039c698Shih-wei Liao#include <mcld/IRBuilder.h> 1522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao#include <mcld/LD/LDSection.h> 1622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao#include <mcld/LD/LDContext.h> 1722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao#include <mcld/LD/Archive.h> 1822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao#include <mcld/LD/ArchiveReader.h> 1922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao#include <mcld/LD/ObjectReader.h> 2022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao#include <mcld/LD/DynObjReader.h> 2122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao#include <mcld/LD/GroupReader.h> 22d0fbbb227051be16931a1aa9b4a7722ac039c698Shih-wei Liao#include <mcld/LD/BinaryReader.h> 2322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao#include <mcld/LD/ObjectWriter.h> 2422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao#include <mcld/LD/ResolveInfo.h> 2522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao#include <mcld/LD/RelocData.h> 2622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao#include <mcld/Support/RealPath.h> 2722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao#include <mcld/Support/MemoryArea.h> 2822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao#include <mcld/Support/MsgHandling.h> 2922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao#include <mcld/Target/TargetLDBackend.h> 3022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao#include <mcld/Fragment/FragmentLinker.h> 3122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao#include <mcld/Object/ObjectBuilder.h> 3222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 3322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao#include <llvm/Support/Casting.h> 3422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 356f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines 3622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liaousing namespace llvm; 3722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liaousing namespace mcld; 3822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 3922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei LiaoObjectLinker::ObjectLinker(const LinkerConfig& pConfig, 4022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao TargetLDBackend& pLDBackend) 4122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao : m_Config(pConfig), 4222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao m_pLinker(NULL), 436f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines m_pModule(NULL), 446f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines m_pBuilder(NULL), 4522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao m_LDBackend(pLDBackend), 4622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao m_pObjectReader(NULL), 4722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao m_pDynObjReader(NULL), 4822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao m_pArchiveReader(NULL), 49d0fbbb227051be16931a1aa9b4a7722ac039c698Shih-wei Liao m_pGroupReader(NULL), 50d0fbbb227051be16931a1aa9b4a7722ac039c698Shih-wei Liao m_pBinaryReader(NULL), 516f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines m_pWriter(NULL) { 5222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 5322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 5422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei LiaoObjectLinker::~ObjectLinker() 5522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao{ 5622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao delete m_pLinker; 5722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao delete m_pObjectReader; 5822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao delete m_pDynObjReader; 5922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao delete m_pArchiveReader; 60d0fbbb227051be16931a1aa9b4a7722ac039c698Shih-wei Liao delete m_pGroupReader; 61d0fbbb227051be16931a1aa9b4a7722ac039c698Shih-wei Liao delete m_pBinaryReader; 626f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines delete m_pWriter; 636f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines} 646f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines 656f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hinesvoid ObjectLinker::setup(Module& pModule, IRBuilder& pBuilder) 666f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines{ 676f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines m_pModule = &pModule; 686f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines m_pBuilder = &pBuilder; 696f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines // set up soname 706f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines if (!m_Config.options().soname().empty()) { 716f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines m_pModule->setName(m_Config.options().soname()); 726f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines } 7322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 7422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 7522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao/// initFragmentLinker - initialize FragmentLinker 7622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao/// Connect all components with FragmentLinker 7722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liaobool ObjectLinker::initFragmentLinker() 7822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao{ 7922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao if (NULL == m_pLinker) { 8022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao m_pLinker = new FragmentLinker(m_Config, 816f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines *m_pModule, 8222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao m_LDBackend); 8322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } 8422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 8522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao // initialize the readers and writers 8622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao // Because constructor can not be failed, we initalize all readers and 8722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao // writers outside the FragmentLinker constructors. 886f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines m_pObjectReader = m_LDBackend.createObjectReader(*m_pBuilder); 896f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines m_pArchiveReader = m_LDBackend.createArchiveReader(*m_pModule); 906f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines m_pDynObjReader = m_LDBackend.createDynObjReader(*m_pBuilder); 916f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines m_pGroupReader = new GroupReader(*m_pModule, *m_pObjectReader, 9222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao *m_pDynObjReader, *m_pArchiveReader); 936f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines m_pBinaryReader = m_LDBackend.createBinaryReader(*m_pBuilder); 946f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines m_pWriter = m_LDBackend.createWriter(); 9522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 96d0fbbb227051be16931a1aa9b4a7722ac039c698Shih-wei Liao // initialize Relocator 976f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines m_LDBackend.initRelocator(); 9822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao return true; 9922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 10022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 10122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao/// initStdSections - initialize standard sections 10222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liaobool ObjectLinker::initStdSections() 10322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao{ 1046f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines ObjectBuilder builder(m_Config, *m_pModule); 10522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 10622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao // initialize standard sections 10722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao if (!m_LDBackend.initStdSections(builder)) 10822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao return false; 10922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 11022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao // initialize target-dependent sections 1116f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines m_LDBackend.initTargetSections(*m_pModule, builder); 11222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 11322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao return true; 11422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 11522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 11622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liaovoid ObjectLinker::normalize() 11722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao{ 11822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao // ----- set up inputs ----- // 1196f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines Module::input_iterator input, inEnd = m_pModule->input_end(); 1206f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines for (input = m_pModule->input_begin(); input!=inEnd; ++input) { 12122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao // is a group node 12222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao if (isGroup(input)) { 1236f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines getGroupReader()->readGroup(input, m_pBuilder->getInputBuilder(), m_Config); 12422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao continue; 12522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } 12622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 12722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao // already got type - for example, bitcode or external OIR (object 12822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao // intermediate representation) 12922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao if ((*input)->type() == Input::Script || 13022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao (*input)->type() == Input::Archive || 13122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao (*input)->type() == Input::External) 13222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao continue; 13322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 13422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao if (Input::Object == (*input)->type()) { 1356f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines m_pModule->getObjectList().push_back(*input); 13622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao continue; 13722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } 13822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 13922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao if (Input::DynObj == (*input)->type()) { 1406f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines m_pModule->getLibraryList().push_back(*input); 14122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao continue; 14222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } 14322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 144d0fbbb227051be16931a1aa9b4a7722ac039c698Shih-wei Liao // read input as a binary file 145d0fbbb227051be16931a1aa9b4a7722ac039c698Shih-wei Liao if (m_Config.options().isBinaryInput()) { 146d0fbbb227051be16931a1aa9b4a7722ac039c698Shih-wei Liao (*input)->setType(Input::Object); 147d0fbbb227051be16931a1aa9b4a7722ac039c698Shih-wei Liao getBinaryReader()->readBinary(**input); 1486f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines m_pModule->getObjectList().push_back(*input); 149d0fbbb227051be16931a1aa9b4a7722ac039c698Shih-wei Liao } 15022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao // is a relocatable object file 151d0fbbb227051be16931a1aa9b4a7722ac039c698Shih-wei Liao else if (getObjectReader()->isMyFormat(**input)) { 15222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao (*input)->setType(Input::Object); 15322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao getObjectReader()->readHeader(**input); 15422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao getObjectReader()->readSections(**input); 15522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao getObjectReader()->readSymbols(**input); 1566f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines m_pModule->getObjectList().push_back(*input); 15722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } 15822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao // is a shared object file 15922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao else if (getDynObjReader()->isMyFormat(**input)) { 16022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao (*input)->setType(Input::DynObj); 16122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao getDynObjReader()->readHeader(**input); 16222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao getDynObjReader()->readSymbols(**input); 1636f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines m_pModule->getLibraryList().push_back(*input); 16422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } 16522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao // is an archive 16622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao else if (getArchiveReader()->isMyFormat(**input)) { 16722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao (*input)->setType(Input::Archive); 1686f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines Archive archive(**input, m_pBuilder->getInputBuilder()); 16922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao getArchiveReader()->readArchive(archive); 17022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao if(archive.numOfObjectMember() > 0) { 1716f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines m_pModule->getInputTree().merge<InputTree::Inclusive>(input, 17222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao archive.inputs()); 17322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } 17422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } 17522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao else { 17622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao fatal(diag::err_unrecognized_input_file) << (*input)->path() 177d0fbbb227051be16931a1aa9b4a7722ac039c698Shih-wei Liao << m_Config.targets().triple().str(); 17822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } 17922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } // end of for 18022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 18122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 18222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liaobool ObjectLinker::linkable() const 18322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao{ 18422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao // check we have input and output files 1856f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines if (m_pModule->getInputTree().empty()) { 18622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao error(diag::err_no_inputs); 18722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao return false; 18822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } 18922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 19022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao // can not mix -static with shared objects 1916f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines Module::const_lib_iterator lib, libEnd = m_pModule->lib_end(); 1926f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines for (lib = m_pModule->lib_begin(); lib != libEnd; ++lib) { 19322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao if((*lib)->attribute()->isStatic()) { 19422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao error(diag::err_mixed_shared_static_objects) 19522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao << (*lib)->name() << (*lib)->path(); 19622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao return false; 19722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } 19822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } 19922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 2006f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines // --nmagic and --omagic options lead to static executable program. 2016f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines // These options turn off page alignment of sections. Because the 2026f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines // sections are not aligned to pages, these sections can not contain any 2036f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines // exported functions. Also, because the two options disable linking 2046f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines // against shared libraries, the output absolutely does not call outside 2056f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines // functions. 2066f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines if (m_Config.options().nmagic() && !m_Config.isCodeStatic()) { 2076f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines error(diag::err_nmagic_not_static); 2086f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines return false; 2096f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines } 2106f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines if (m_Config.options().omagic() && !m_Config.isCodeStatic()) { 2116f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines error(diag::err_omagic_not_static); 2126f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines return false; 2136f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines } 2146f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines 21522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao return true; 21622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 21722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 21822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao/// readRelocations - read all relocation entries 21922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao/// 22022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao/// All symbols should be read and resolved before this function. 22122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liaobool ObjectLinker::readRelocations() 22222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao{ 22322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao // Bitcode is read by the other path. This function reads relocation sections 22422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao // in object files. 2256f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines mcld::InputTree::bfs_iterator input, inEnd = m_pModule->getInputTree().bfs_end(); 2266f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines for (input=m_pModule->getInputTree().bfs_begin(); input!=inEnd; ++input) { 22722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao if ((*input)->type() == Input::Object && (*input)->hasMemArea()) { 22822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao if (!getObjectReader()->readRelocations(**input)) 22922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao return false; 23022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } 23122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao // ignore the other kinds of files. 23222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } 23322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao return true; 23422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 23522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 23622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao/// mergeSections - put allinput sections into output sections 23722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liaobool ObjectLinker::mergeSections() 23822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao{ 2396f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines ObjectBuilder builder(m_Config, *m_pModule); 2406f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines Module::obj_iterator obj, objEnd = m_pModule->obj_end(); 2416f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines for (obj = m_pModule->obj_begin(); obj != objEnd; ++obj) { 24222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao LDContext::sect_iterator sect, sectEnd = (*obj)->context()->sectEnd(); 24322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao for (sect = (*obj)->context()->sectBegin(); sect != sectEnd; ++sect) { 24422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao switch ((*sect)->kind()) { 24522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao // Some *INPUT sections should not be merged. 24622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao case LDFileFormat::Ignore: 24722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao case LDFileFormat::Null: 24822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao case LDFileFormat::Relocation: 24922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao case LDFileFormat::NamePool: 25022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao case LDFileFormat::Group: 25122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao case LDFileFormat::StackNote: 25222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao // skip 25322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao continue; 25422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao case LDFileFormat::Target: 2556f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines if (!m_LDBackend.mergeSection(*m_pModule, **sect)) { 25622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao error(diag::err_cannot_merge_section) << (*sect)->name() 25722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao << (*obj)->name(); 25822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao return false; 25922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } 26022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao break; 26122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao case LDFileFormat::EhFrame: { 26222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao if (!(*sect)->hasEhFrame()) 26322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao continue; // skip 26422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 2656f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines if (NULL == builder.MergeSection(**sect)) { 26622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao error(diag::err_cannot_merge_section) << (*sect)->name() 26722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao << (*obj)->name(); 26822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao return false; 26922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } 27022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao break; 27122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } 27222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao default: { 27322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao if (!(*sect)->hasSectionData()) 27422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao continue; // skip 27522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 2766f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines LDSection* out_sect = builder.MergeSection(**sect); 2776f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines if (NULL != out_sect) { 2786f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines if (!m_LDBackend.updateSectionFlags(*out_sect, **sect)) { 2796f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines error(diag::err_cannot_merge_section) << (*sect)->name() 2806f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines << (*obj)->name(); 2816f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines return false; 2826f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines } 2836f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines } 2846f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines else { 28522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao error(diag::err_cannot_merge_section) << (*sect)->name() 28622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao << (*obj)->name(); 28722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao return false; 28822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } 28922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao break; 29022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } 29122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } // end of switch 29222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } // for each section 29322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } // for each obj 29422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao return true; 29522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 29622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 29722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao/// addStandardSymbols - shared object and executable files need some 29822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao/// standard symbols 29922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao/// @return if there are some input symbols with the same name to the 30022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao/// standard symbols, return false 30122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liaobool ObjectLinker::addStandardSymbols() 30222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao{ 30322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao // create and add section symbols for each output section 3046f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines Module::iterator iter, iterEnd = m_pModule->end(); 3056f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines for (iter = m_pModule->begin(); iter != iterEnd; ++iter) { 3066f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines m_pModule->getSectionSymbolSet().add(**iter, m_pModule->getNamePool()); 30722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } 30822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 3096f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines return m_LDBackend.initStandardSymbols(*m_pBuilder, *m_pModule); 31022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 31122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 31222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao/// addTargetSymbols - some targets, such as MIPS and ARM, need some 31322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao/// target-dependent symbols 31422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao/// @return if there are some input symbols with the same name to the 31522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao/// target symbols, return false 31622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liaobool ObjectLinker::addTargetSymbols() 31722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao{ 3186f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines m_LDBackend.initTargetSymbols(*m_pBuilder, *m_pModule); 3196f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines return true; 3206f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines} 3216f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines 3226f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines/// addScriptSymbols - define symbols from the command line option or linker 3236f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines/// scripts. 3246f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines/// @return if there are some existing symbols with identical name to the 3256f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines/// script symbols, return false. 3266f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hinesbool ObjectLinker::addScriptSymbols() 3276f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines{ 32822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao return true; 32922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 33022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 33122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liaobool ObjectLinker::scanRelocations() 33222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao{ 33322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao // apply all relocations of all inputs 3346f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines Module::obj_iterator input, inEnd = m_pModule->obj_end(); 3356f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines for (input = m_pModule->obj_begin(); input != inEnd; ++input) { 33622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao LDContext::sect_iterator rs, rsEnd = (*input)->context()->relocSectEnd(); 33722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao for (rs = (*input)->context()->relocSectBegin(); rs != rsEnd; ++rs) { 33822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao // bypass the reloc section if 33922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao // 1. its section kind is changed to Ignore. (The target section is a 34022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao // discarded group section.) 34122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao // 2. it has no reloc data. (All symbols in the input relocs are in the 34222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao // discarded group sections) 34322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao if (LDFileFormat::Ignore == (*rs)->kind() || !(*rs)->hasRelocData()) 34422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao continue; 34522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao RelocData::iterator reloc, rEnd = (*rs)->getRelocData()->end(); 34622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao for (reloc = (*rs)->getRelocData()->begin(); reloc != rEnd; ++reloc) { 34722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao Relocation* relocation = llvm::cast<Relocation>(reloc); 34822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao // scan relocation 3496f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines if (LinkerConfig::Object != m_Config.codeGenType()) 3506f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines m_LDBackend.scanRelocation(*relocation, *m_pBuilder, *m_pModule, **rs); 3516f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines else 3526f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines m_LDBackend.partialScanRelocation(*relocation, *m_pModule, **rs); 35322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } // for all relocations 35422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } // for all relocation section 35522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } // for all inputs 35622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao return true; 35722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 35822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 3596f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines/// initStubs - initialize stub-related stuff. 3606f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hinesbool ObjectLinker::initStubs() 3616f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines{ 3626f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines // initialize BranchIslandFactory 3636f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines m_LDBackend.initBRIslandFactory(); 3646f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines 3656f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines // initialize StubFactory 3666f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines m_LDBackend.initStubFactory(); 3676f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines 3686f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines // initialize target stubs 3696f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines m_LDBackend.initTargetStubs(); 3706f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines return true; 3716f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines} 3726f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines 3736f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines/// allocateCommonSymobols - allocate fragments for common symbols to the 3746f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines/// corresponding sections 3756f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hinesbool ObjectLinker::allocateCommonSymbols() 3766f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines{ 3776f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines if (LinkerConfig::Object != m_Config.codeGenType() || 3786f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines m_Config.options().isDefineCommon()) 3796f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines return m_LDBackend.allocateCommonSymbols(*m_pModule); 3806f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines return true; 3816f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines} 3826f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines 38322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao/// prelayout - help backend to do some modification before layout 38422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liaobool ObjectLinker::prelayout() 38522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao{ 38622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao // finalize the section symbols, set their fragment reference and push them 38722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao // into output symbol table 3886f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines Module::iterator sect, sEnd = m_pModule->end(); 3896f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines for (sect = m_pModule->begin(); sect != sEnd; ++sect) { 3906f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines m_pModule->getSectionSymbolSet().finalize(**sect, m_pModule->getSymbolTable()); 39122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } 39222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 3936f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines m_LDBackend.preLayout(*m_pModule, *m_pBuilder); 39422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 39522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao /// check program interpreter - computer the name size of the runtime dyld 3966f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines if (!m_Config.isCodeStatic() && 39722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao (LinkerConfig::Exec == m_Config.codeGenType() || 39822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao m_Config.options().isPIE() || 39922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao m_Config.options().hasDyld())) 40022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao m_LDBackend.sizeInterp(); 40122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 40222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao /// measure NamePools - compute the size of name pool sections 40322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao /// In ELF, will compute the size of.symtab, .strtab, .dynsym, .dynstr, 40422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao /// .hash and .shstrtab sections. 40522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao /// 40622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao /// dump all symbols and strings from FragmentLinker and build the format-dependent 40722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao /// hash table. 4086f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines m_LDBackend.sizeNamePools(*m_pModule, m_Config.isCodeStatic()); 40922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 41022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao return true; 41122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 41222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 41322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao/// layout - linearly layout all output sections and reserve some space 41422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao/// for GOT/PLT 41522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao/// Because we do not support instruction relaxing in this early version, 41622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao/// if there is a branch can not jump to its target, we return false 41722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao/// directly 41822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liaobool ObjectLinker::layout() 41922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao{ 4206f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines m_LDBackend.layout(*m_pModule); 421d0fbbb227051be16931a1aa9b4a7722ac039c698Shih-wei Liao return true; 42222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 42322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 42422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao/// prelayout - help backend to do some modification after layout 42522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liaobool ObjectLinker::postlayout() 42622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao{ 4276f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines m_LDBackend.postLayout(*m_pModule, *m_pBuilder); 42822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao return true; 42922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 43022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 43122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao/// finalizeSymbolValue - finalize the resolved symbol value. 43222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao/// Before relocate(), after layout(), FragmentLinker should correct value of all 43322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao/// symbol. 43422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liaobool ObjectLinker::finalizeSymbolValue() 43522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao{ 4366f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines return (m_pLinker->finalizeSymbols() && m_LDBackend.finalizeSymbols()); 43722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 43822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 43922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao/// relocate - applying relocation entries and create relocation 44022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao/// section in the output files 44122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao/// Create relocation section, asking TargetLDBackend to 44222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao/// read the relocation information into RelocationEntry 44322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao/// and push_back into the relocation section 44422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liaobool ObjectLinker::relocation() 44522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao{ 44622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao return m_pLinker->applyRelocations(); 44722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 44822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 44922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao/// emitOutput - emit the output file. 45022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liaobool ObjectLinker::emitOutput(MemoryArea& pOutput) 45122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao{ 4526f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines return llvm::errc::success == getWriter()->writeObject(*m_pModule, pOutput); 45322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 45422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 45522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao/// postProcessing - do modification after all processes 45622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liaobool ObjectLinker::postProcessing(MemoryArea& pOutput) 45722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao{ 45822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao m_pLinker->syncRelocationResult(pOutput); 45922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 46022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao // emit .eh_frame_hdr 46122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao // eh_frame_hdr should be emitted after syncRelocation, because eh_frame_hdr 46222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao // needs FDE PC value, which will be corrected at syncRelocation 4636f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines m_LDBackend.postProcessing(pOutput); 46422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao return true; 46522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 46622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 467