1 //===-- DWARFCompileUnit.h --------------------------------------*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 #ifndef LLVM_DEBUGINFO_DWARFCOMPILEUNIT_H 11 #define LLVM_DEBUGINFO_DWARFCOMPILEUNIT_H 12 13 #include "DWARFDebugAbbrev.h" 14 #include "DWARFDebugInfoEntry.h" 15 #include "DWARFDebugRangeList.h" 16 #include "DWARFRelocMap.h" 17 #include <vector> 18 19 namespace llvm { 20 21 class DWARFDebugAbbrev; 22 class StringRef; 23 class raw_ostream; 24 25 class DWARFCompileUnit { 26 const DWARFDebugAbbrev *Abbrev; 27 StringRef InfoSection; 28 StringRef AbbrevSection; 29 StringRef RangeSection; 30 StringRef StringSection; 31 StringRef StringOffsetSection; 32 StringRef AddrOffsetSection; 33 const RelocAddrMap *RelocMap; 34 bool isLittleEndian; 35 36 uint32_t Offset; 37 uint32_t Length; 38 uint16_t Version; 39 const DWARFAbbreviationDeclarationSet *Abbrevs; 40 uint8_t AddrSize; 41 uint64_t BaseAddr; 42 // The compile unit debug information entry item. 43 std::vector<DWARFDebugInfoEntryMinimal> DieArray; 44 public: 45 46 DWARFCompileUnit(const DWARFDebugAbbrev *DA, StringRef IS, StringRef AS, 47 StringRef RS, StringRef SS, StringRef SOS, StringRef AOS, 48 const RelocAddrMap *M, bool LE) : 49 Abbrev(DA), InfoSection(IS), AbbrevSection(AS), 50 RangeSection(RS), StringSection(SS), StringOffsetSection(SOS), 51 AddrOffsetSection(AOS), RelocMap(M), isLittleEndian(LE) { 52 clear(); 53 } 54 55 StringRef getStringSection() const { return StringSection; } 56 StringRef getStringOffsetSection() const { return StringOffsetSection; } 57 StringRef getAddrOffsetSection() const { return AddrOffsetSection; } 58 const RelocAddrMap *getRelocMap() const { return RelocMap; } 59 DataExtractor getDebugInfoExtractor() const; 60 61 bool extract(DataExtractor debug_info, uint32_t* offset_ptr); 62 uint32_t extract(uint32_t offset, DataExtractor debug_info_data, 63 const DWARFAbbreviationDeclarationSet *abbrevs); 64 65 /// extractDIEsIfNeeded - Parses a compile unit and indexes its DIEs if it 66 /// hasn't already been done. Returns the number of DIEs parsed at this call. 67 size_t extractDIEsIfNeeded(bool cu_die_only); 68 /// extractRangeList - extracts the range list referenced by this compile 69 /// unit from .debug_ranges section. Returns true on success. 70 /// Requires that compile unit is already extracted. 71 bool extractRangeList(uint32_t RangeListOffset, 72 DWARFDebugRangeList &RangeList) const; 73 void clear(); 74 void dump(raw_ostream &OS); 75 uint32_t getOffset() const { return Offset; } 76 /// Size in bytes of the compile unit header. 77 uint32_t getSize() const { return 11; } 78 bool containsDIEOffset(uint32_t die_offset) const { 79 return die_offset >= getFirstDIEOffset() && 80 die_offset < getNextCompileUnitOffset(); 81 } 82 uint32_t getFirstDIEOffset() const { return Offset + getSize(); } 83 uint32_t getNextCompileUnitOffset() const { return Offset + Length + 4; } 84 /// Size in bytes of the .debug_info data associated with this compile unit. 85 size_t getDebugInfoSize() const { return Length + 4 - getSize(); } 86 uint32_t getLength() const { return Length; } 87 uint16_t getVersion() const { return Version; } 88 const DWARFAbbreviationDeclarationSet *getAbbreviations() const { 89 return Abbrevs; 90 } 91 uint8_t getAddressByteSize() const { return AddrSize; } 92 uint64_t getBaseAddress() const { return BaseAddr; } 93 94 void setBaseAddress(uint64_t base_addr) { 95 BaseAddr = base_addr; 96 } 97 98 const DWARFDebugInfoEntryMinimal * 99 getCompileUnitDIE(bool extract_cu_die_only = true) { 100 extractDIEsIfNeeded(extract_cu_die_only); 101 if (DieArray.empty()) 102 return NULL; 103 return &DieArray[0]; 104 } 105 106 const char *getCompilationDir(); 107 108 /// setDIERelations - We read in all of the DIE entries into our flat list 109 /// of DIE entries and now we need to go back through all of them and set the 110 /// parent, sibling and child pointers for quick DIE navigation. 111 void setDIERelations(); 112 113 void addDIE(DWARFDebugInfoEntryMinimal &die) { 114 // The average bytes per DIE entry has been seen to be 115 // around 14-20 so lets pre-reserve the needed memory for 116 // our DIE entries accordingly. Search forward for "Compute 117 // average bytes per DIE" to see #if'ed out code that does 118 // that determination. 119 120 // Only reserve the memory if we are adding children of 121 // the main compile unit DIE. The compile unit DIE is always 122 // the first entry, so if our size is 1, then we are adding 123 // the first compile unit child DIE and should reserve 124 // the memory. 125 if (DieArray.empty()) 126 DieArray.reserve(getDebugInfoSize() / 14); 127 DieArray.push_back(die); 128 } 129 130 void clearDIEs(bool keep_compile_unit_die); 131 132 void buildAddressRangeTable(DWARFDebugAranges *debug_aranges, 133 bool clear_dies_if_already_not_parsed); 134 135 /// getInlinedChainForAddress - fetches inlined chain for a given address. 136 /// Returns empty chain if there is no subprogram containing address. 137 DWARFDebugInfoEntryMinimal::InlinedChain getInlinedChainForAddress( 138 uint64_t Address); 139 }; 140 141 } 142 143 #endif 144
