1 //===- ELFSegment.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_LD_ELFSEGMENT_H 10 #define MCLD_LD_ELFSEGMENT_H 11 #include <mcld/Support/Allocators.h> 12 #include <mcld/Config/Config.h> 13 #include <llvm/Support/ELF.h> 14 #include <llvm/Support/DataTypes.h> 15 #include <vector> 16 17 namespace mcld 18 { 19 20 class LDSection; 21 22 /** \class ELFSegment 23 * \brief decribe the program header for ELF executable or shared object 24 */ 25 class ELFSegment 26 { 27 public: 28 typedef std::vector<LDSection*> SectionList; 29 typedef SectionList::iterator iterator; 30 typedef SectionList::const_iterator const_iterator; 31 typedef SectionList::reverse_iterator reverse_iterator; 32 typedef SectionList::const_reverse_iterator const_reverse_iterator; 33 34 private: 35 friend class Chunk<ELFSegment, MCLD_SEGMENTS_PER_OUTPUT>; 36 ELFSegment(); 37 ELFSegment(uint32_t pType, uint32_t pFlag = llvm::ELF::PF_R); 38 39 public: 40 ~ELFSegment(); 41 42 /// ----- iterators ----- /// 43 iterator begin() { return m_SectionList.begin(); } 44 const_iterator begin() const { return m_SectionList.begin(); } 45 iterator end() { return m_SectionList.end(); } 46 const_iterator end() const { return m_SectionList.end(); } 47 48 reverse_iterator rbegin() { return m_SectionList.rbegin(); } 49 const_reverse_iterator rbegin() const { return m_SectionList.rbegin(); } 50 reverse_iterator rend() { return m_SectionList.rend(); } 51 const_reverse_iterator rend() const { return m_SectionList.rend(); } 52 53 LDSection* front() { return m_SectionList.front(); } 54 const LDSection* front() const { return m_SectionList.front(); } 55 LDSection* back() { return m_SectionList.back(); } 56 const LDSection* back() const { return m_SectionList.back(); } 57 58 /// ----- observers ----- /// 59 uint32_t type() const { return m_Type; } 60 uint64_t offset() const { return m_Offset; } 61 uint64_t vaddr() const { return m_Vaddr; } 62 uint64_t paddr() const { return m_Paddr; } 63 uint64_t filesz() const { return m_Filesz; } 64 uint64_t memsz() const { return m_Memsz; } 65 uint32_t flag() const { return m_Flag; } 66 uint64_t align() const { return std::max(m_Align, m_MaxSectionAlign); } 67 68 size_t size() const { return m_SectionList.size(); } 69 bool empty() const { return m_SectionList.empty(); } 70 71 bool isLoadSegment() const; 72 bool isDataSegment() const; 73 bool isBssSegment() const; 74 75 /// ----- modifiers ----- /// 76 void setOffset(uint64_t pOffset) 77 { m_Offset = pOffset; } 78 79 void setVaddr(uint64_t pVaddr) 80 { m_Vaddr = pVaddr; } 81 82 void setPaddr(uint64_t pPaddr) 83 { m_Paddr = pPaddr; } 84 85 void setFilesz(uint64_t pFilesz) 86 { m_Filesz = pFilesz; } 87 88 void setMemsz(uint64_t pMemsz) 89 { m_Memsz = pMemsz; } 90 91 void setFlag(uint32_t pFlag) 92 { m_Flag = pFlag; } 93 94 void updateFlag(uint32_t pFlag) 95 { 96 // PT_TLS segment should be PF_R 97 if (llvm::ELF::PT_TLS != m_Type) 98 m_Flag |= pFlag; 99 } 100 101 void setAlign(uint64_t pAlign) 102 { m_Align = pAlign; } 103 104 iterator insert(iterator pPos, LDSection* pSection); 105 106 void append(LDSection* pSection); 107 108 /* factory methods */ 109 static ELFSegment* Create(uint32_t pType, uint32_t pFlag = llvm::ELF::PF_R); 110 static void Destroy(ELFSegment*& pSegment); 111 static void Clear(); 112 113 private: 114 uint32_t m_Type; // Type of segment 115 uint32_t m_Flag; // Segment flags 116 uint64_t m_Offset; // File offset where segment is located, in bytes 117 uint64_t m_Vaddr; // Virtual address of the segment 118 uint64_t m_Paddr; // Physical address of the segment (OS-specific) 119 uint64_t m_Filesz; // # of bytes in file image of segment (may be 0) 120 uint64_t m_Memsz; // # of bytes in mem image of segment (may be 0) 121 uint64_t m_Align; // alignment constraint 122 uint64_t m_MaxSectionAlign; // max alignment of the sections in this segment 123 SectionList m_SectionList; 124 }; 125 126 } // namespace of mcld 127 128 #endif 129 130
