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/Config/Config.h" 12 #include "mcld/Support/Allocators.h" 13 14 #include <llvm/Support/DataTypes.h> 15 #include <llvm/Support/ELF.h> 16 17 #include <vector> 18 19 namespace mcld { 20 21 class LDSection; 22 23 /** \class ELFSegment 24 * \brief decribe the program header for ELF executable or shared object 25 */ 26 class ELFSegment { 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 explicit 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) { m_Offset = pOffset; } 77 78 void setVaddr(uint64_t pVaddr) { m_Vaddr = pVaddr; } 79 80 void setPaddr(uint64_t pPaddr) { m_Paddr = pPaddr; } 81 82 void setFilesz(uint64_t pFilesz) { m_Filesz = pFilesz; } 83 84 void setMemsz(uint64_t pMemsz) { m_Memsz = pMemsz; } 85 86 void setFlag(uint32_t pFlag) { m_Flag = pFlag; } 87 88 void updateFlag(uint32_t pFlag) { 89 // PT_TLS segment should be PF_R 90 if (llvm::ELF::PT_TLS != m_Type) 91 m_Flag |= pFlag; 92 } 93 94 void setAlign(uint64_t pAlign) { m_Align = pAlign; } 95 96 iterator insert(iterator pPos, LDSection* pSection); 97 98 void append(LDSection* pSection); 99 100 /* factory methods */ 101 static ELFSegment* Create(uint32_t pType, uint32_t pFlag = llvm::ELF::PF_R); 102 static void Destroy(ELFSegment*& pSegment); 103 static void Clear(); 104 105 private: 106 uint32_t m_Type; // Type of segment 107 uint32_t m_Flag; // Segment flags 108 uint64_t m_Offset; // File offset where segment is located, in bytes 109 uint64_t m_Vaddr; // Virtual address of the segment 110 uint64_t m_Paddr; // Physical address of the segment (OS-specific) 111 uint64_t m_Filesz; // # of bytes in file image of segment (may be 0) 112 uint64_t m_Memsz; // # of bytes in mem image of segment (may be 0) 113 uint64_t m_Align; // alignment constraint 114 uint64_t m_MaxSectionAlign; // max alignment of the sections in this segment 115 SectionList m_SectionList; 116 }; 117 118 } // namespace mcld 119 120 #endif // MCLD_LD_ELFSEGMENT_H_ 121
