1 //===-- DWARFContext.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_DWARFCONTEXT_H 11 #define LLVM_DEBUGINFO_DWARFCONTEXT_H 12 13 #include "DWARFCompileUnit.h" 14 #include "DWARFDebugAranges.h" 15 #include "DWARFDebugLine.h" 16 #include "llvm/DebugInfo/DIContext.h" 17 #include "llvm/ADT/OwningPtr.h" 18 #include "llvm/ADT/SmallVector.h" 19 20 namespace llvm { 21 22 /// DWARFContext 23 /// This data structure is the top level entity that deals with dwarf debug 24 /// information parsing. The actual data is supplied through pure virtual 25 /// methods that a concrete implementation provides. 26 class DWARFContext : public DIContext { 27 bool IsLittleEndian; 28 29 SmallVector<DWARFCompileUnit, 1> CUs; 30 OwningPtr<DWARFDebugAbbrev> Abbrev; 31 OwningPtr<DWARFDebugAranges> Aranges; 32 OwningPtr<DWARFDebugLine> Line; 33 34 DWARFContext(DWARFContext &); // = delete 35 DWARFContext &operator=(DWARFContext &); // = delete 36 37 /// Read compile units from the debug_info section and store them in CUs. 38 void parseCompileUnits(); 39 protected: DWARFContext(bool isLittleEndian)40 DWARFContext(bool isLittleEndian) : IsLittleEndian(isLittleEndian) {} 41 public: 42 virtual void dump(raw_ostream &OS); 43 /// Get the number of compile units in this context. getNumCompileUnits()44 unsigned getNumCompileUnits() { 45 if (CUs.empty()) 46 parseCompileUnits(); 47 return CUs.size(); 48 } 49 /// Get the compile unit at the specified index for this compile unit. getCompileUnitAtIndex(unsigned index)50 DWARFCompileUnit *getCompileUnitAtIndex(unsigned index) { 51 if (CUs.empty()) 52 parseCompileUnits(); 53 return &CUs[index]; 54 } 55 56 /// Return the compile unit that includes an offset (relative to .debug_info). 57 DWARFCompileUnit *getCompileUnitForOffset(uint32_t offset); 58 59 /// Get a pointer to the parsed DebugAbbrev object. 60 const DWARFDebugAbbrev *getDebugAbbrev(); 61 62 /// Get a pointer to the parsed DebugAranges object. 63 const DWARFDebugAranges *getDebugAranges(); 64 65 /// Get a pointer to a parsed line table corresponding to a compile unit. 66 const DWARFDebugLine::LineTable * 67 getLineTableForCompileUnit(DWARFCompileUnit *cu); 68 69 virtual DILineInfo getLineInfoForAddress(uint64_t address); 70 isLittleEndian()71 bool isLittleEndian() const { return IsLittleEndian; } 72 73 virtual StringRef getInfoSection() = 0; 74 virtual StringRef getAbbrevSection() = 0; 75 virtual StringRef getARangeSection() = 0; 76 virtual StringRef getLineSection() = 0; 77 virtual StringRef getStringSection() = 0; 78 isSupportedVersion(unsigned version)79 static bool isSupportedVersion(unsigned version) { 80 return version == 2 || version == 3; 81 } 82 }; 83 84 85 /// DWARFContextInMemory is the simplest possible implementation of a 86 /// DWARFContext. It assumes all content is available in memory and stores 87 /// pointers to it. 88 class DWARFContextInMemory : public DWARFContext { 89 virtual void anchor(); 90 StringRef InfoSection; 91 StringRef AbbrevSection; 92 StringRef ARangeSection; 93 StringRef LineSection; 94 StringRef StringSection; 95 public: DWARFContextInMemory(bool isLittleEndian,StringRef infoSection,StringRef abbrevSection,StringRef aRangeSection,StringRef lineSection,StringRef stringSection)96 DWARFContextInMemory(bool isLittleEndian, 97 StringRef infoSection, 98 StringRef abbrevSection, 99 StringRef aRangeSection, 100 StringRef lineSection, 101 StringRef stringSection) 102 : DWARFContext(isLittleEndian), 103 InfoSection(infoSection), 104 AbbrevSection(abbrevSection), 105 ARangeSection(aRangeSection), 106 LineSection(lineSection), 107 StringSection(stringSection) 108 {} 109 getInfoSection()110 virtual StringRef getInfoSection() { return InfoSection; } getAbbrevSection()111 virtual StringRef getAbbrevSection() { return AbbrevSection; } getARangeSection()112 virtual StringRef getARangeSection() { return ARangeSection; } getLineSection()113 virtual StringRef getLineSection() { return LineSection; } getStringSection()114 virtual StringRef getStringSection() { return StringSection; } 115 }; 116 117 } 118 119 #endif 120