1 //===- PLT.h --------------------------------------------------------------===// 2 // 3 // The MCLinker Project 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 #ifndef MCLD_PROCEDURE_LINKAGE_TABLE_H 10 #define MCLD_PROCEDURE_LINKAGE_TABLE_H 11 #ifdef ENABLE_UNITTEST 12 #include <gtest.h> 13 #endif 14 15 #include <mcld/LD/LDSection.h> 16 #include <mcld/LD/SectionData.h> 17 #include <mcld/Fragment/TargetFragment.h> 18 19 namespace mcld { 20 21 class LDSection; 22 class ResolveInfo; 23 24 /** \class PLTEntryDefaultBase 25 * \brief PLTEntryDefaultBase provides the default interface for PLE Entry 26 */ 27 class PLTEntryBase : public TargetFragment 28 { 29 public: 30 PLTEntryBase(SectionData& pParent) 31 : TargetFragment(Fragment::Target, &pParent), m_pValue(NULL) 32 {} 33 34 virtual ~PLTEntryBase() 35 { 36 delete m_pValue; 37 } 38 39 void setValue(unsigned char* pValue) 40 { m_pValue = pValue; } 41 42 const unsigned char* getValue() const 43 { return m_pValue; } 44 45 //Used by llvm::cast<>. 46 static bool classof(const Fragment *O) 47 { return true; } 48 49 protected: 50 unsigned char* m_pValue; 51 }; 52 53 /** \class PLT 54 * \brief Procedure linkage table 55 */ 56 class PLT 57 { 58 public: 59 typedef SectionData::iterator iterator; 60 typedef SectionData::const_iterator const_iterator; 61 62 template<size_t SIZE, typename EntryBase = PLTEntryBase> 63 class Entry : public EntryBase 64 { 65 public: 66 enum { EntrySize = SIZE }; 67 68 public: 69 Entry(SectionData& pParent) 70 : EntryBase(pParent) 71 {} 72 73 virtual ~Entry() {} 74 75 size_t size() const 76 { return EntrySize; } 77 }; 78 79 public: 80 PLT(LDSection& pSection); 81 82 virtual ~PLT(); 83 84 /// reserveEntry - reseve the number of pNum of empty entries 85 /// The empty entris are reserved for layout to adjust the fragment offset. 86 virtual void reserveEntry(size_t pNum = 1) = 0; 87 88 // finalizeSectionSize - set LDSection size 89 virtual void finalizeSectionSize() = 0; 90 91 uint64_t addr() const { return m_Section.addr(); } 92 93 const_iterator begin() const { return m_SectionData->begin(); } 94 iterator begin() { return m_SectionData->begin(); } 95 const_iterator end () const { return m_SectionData->end(); } 96 iterator end () { return m_SectionData->end(); } 97 98 protected: 99 LDSection& m_Section; 100 SectionData* m_SectionData; 101 }; 102 103 } // namespace of mcld 104 105 #endif 106 107
