15460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao//===- GOT.h --------------------------------------------------------------===// 25460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao// 35460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao// The MCLinker Project 45460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao// 55460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao// This file is distributed under the University of Illinois Open Source 65460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao// License. See LICENSE.TXT for details. 75460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao// 85460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao//===----------------------------------------------------------------------===// 9cedee4b38f4786845183be7f5916dd520a170ae0Shih-wei Liao#ifndef MCLD_GLOBAL_OFFSET_TABLE_H 10cedee4b38f4786845183be7f5916dd520a170ae0Shih-wei Liao#define MCLD_GLOBAL_OFFSET_TABLE_H 115460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao#ifdef ENABLE_UNITTEST 125460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao#include <gtest.h> 135460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao#endif 145460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 155460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao#include <mcld/LD/LDSection.h> 16cedee4b38f4786845183be7f5916dd520a170ae0Shih-wei Liao#include <mcld/LD/TargetFragment.h> 175460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 185460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liaonamespace mcld 195460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao{ 205460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 215460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liaoclass GOT; 225460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liaoclass ResolveInfo; 23cedee4b38f4786845183be7f5916dd520a170ae0Shih-wei Liaoclass SectionData; 245460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 255460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao/** \class GOTEntry 265460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao * \brief The entry of Global Offset Table 275460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao */ 28cedee4b38f4786845183be7f5916dd520a170ae0Shih-wei Liaoclass GOTEntry : public TargetFragment 295460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao{ 305460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liaopublic: 315460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao explicit GOTEntry(uint64_t pContent, size_t pEntrySize, 32cedee4b38f4786845183be7f5916dd520a170ae0Shih-wei Liao SectionData* pParent); 335460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 345460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao virtual ~GOTEntry(); 355460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 365460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao uint64_t& getContent() 375460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao { return f_Content; } 385460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 395460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao uint64_t getContent() const 405460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao { return f_Content; } 415460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 425460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao void setContent(uint64_t pValue) 435460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao { f_Content = pValue; } 445460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 45cedee4b38f4786845183be7f5916dd520a170ae0Shih-wei Liao static bool classof(const Fragment *pFrag) 46cedee4b38f4786845183be7f5916dd520a170ae0Shih-wei Liao { return pFrag->getKind() == Fragment::Target; } 475460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 485460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao static bool classof(const GOTEntry* pFrag) 495460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao { return true; } 505460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 515460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao // Override pure virtual function 525460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao size_t getSize() const 535460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao { return m_EntrySize; } 545460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 555460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liaoprotected: 565460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao uint64_t f_Content; 575460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao size_t m_EntrySize; 585460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao}; 595460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 605460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao/** \class GOT 615460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao * \brief The Global Offset Table 625460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao */ 635460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liaoclass GOT 645460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao{ 655460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liaoprotected: 66cedee4b38f4786845183be7f5916dd520a170ae0Shih-wei Liao GOT(LDSection& pSection, SectionData& pSectionData, size_t pEntrySize); 675460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 685460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liaopublic: 695460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao virtual ~GOT(); 705460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 715460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao /// entrySize - the number of bytes per entry 725460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao size_t getEntrySize() const; 735460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 745460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao const LDSection& getSection() const 755460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao { return m_Section; } 765460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 77cedee4b38f4786845183be7f5916dd520a170ae0Shih-wei Liao SectionData& getSectionData() 785460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao { return m_SectionData; } 795460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 80cedee4b38f4786845183be7f5916dd520a170ae0Shih-wei Liao const SectionData& getSectionData() const 815460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao { return m_SectionData; } 825460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 835460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liaopublic: 845460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao /// reserveEntry - reseve number of pNum of empty entries 855460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao /// Before layout, we scan all relocations to determine if GOT entries are 865460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao /// needed. If an entry is needed, the empty entry is reserved for layout 875460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao /// to adjust the fragment offset. After that, we fill up the entries when 885460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao /// applying relocations. 895460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao virtual void reserveEntry(size_t pNum = 1) = 0; 905460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 915460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao /// getEntry - get an empty entry or an exitsted filled entry with pSymbol. 925460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao /// @param pSymbol - the target symbol 935460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao /// @param pExist - ture if a filled entry with pSymbol existed, otherwise false. 945460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao virtual GOTEntry* getEntry(const ResolveInfo& pSymbol, bool& pExist) = 0; 955460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 965460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liaoprotected: 975460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao LDSection& m_Section; 98cedee4b38f4786845183be7f5916dd520a170ae0Shih-wei Liao SectionData& m_SectionData; 995460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao size_t f_EntrySize; 1005460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao}; 1015460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 1025460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao} // namespace of mcld 1035460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 1045460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao#endif 1055460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 106