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annotate lib/DebugInfo/DWARFDebugLine.h @ 77:54457678186b LLVM3.6

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LLVM 3.6
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Mon, 08 Sep 2014 22:06:00 +0900
parents 95c75e76d11b
children
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1 //===-- DWARFDebugLine.h ----------------------------------------*- C++ -*-===//
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===----------------------------------------------------------------------===//
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9
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10 #ifndef LLVM_LIB_DEBUGINFO_DWARFDEBUGLINE_H
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11 #define LLVM_LIB_DEBUGINFO_DWARFDEBUGLINE_H
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12
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13 #include "DWARFRelocMap.h"
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14 #include "llvm/DebugInfo/DIContext.h"
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15 #include "llvm/Support/DataExtractor.h"
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16 #include <map>
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17 #include <string>
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18 #include <vector>
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19
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20 namespace llvm {
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21
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22 class raw_ostream;
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23
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24 class DWARFDebugLine {
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25 public:
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26 DWARFDebugLine(const RelocAddrMap* LineInfoRelocMap) : RelocMap(LineInfoRelocMap) {}
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27 struct FileNameEntry {
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28 FileNameEntry() : Name(nullptr), DirIdx(0), ModTime(0), Length(0) {}
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29
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30 const char *Name;
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31 uint64_t DirIdx;
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32 uint64_t ModTime;
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33 uint64_t Length;
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34 };
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35
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36 struct Prologue {
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37 Prologue();
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38
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39 // The size in bytes of the statement information for this compilation unit
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40 // (not including the total_length field itself).
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41 uint32_t TotalLength;
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42 // Version identifier for the statement information format.
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43 uint16_t Version;
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44 // The number of bytes following the prologue_length field to the beginning
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45 // of the first byte of the statement program itself.
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46 uint32_t PrologueLength;
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47 // The size in bytes of the smallest target machine instruction. Statement
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48 // program opcodes that alter the address register first multiply their
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49 // operands by this value.
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50 uint8_t MinInstLength;
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51 // The maximum number of individual operations that may be encoded in an
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52 // instruction.
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53 uint8_t MaxOpsPerInst;
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54 // The initial value of theis_stmtregister.
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55 uint8_t DefaultIsStmt;
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56 // This parameter affects the meaning of the special opcodes. See below.
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57 int8_t LineBase;
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58 // This parameter affects the meaning of the special opcodes. See below.
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59 uint8_t LineRange;
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60 // The number assigned to the first special opcode.
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61 uint8_t OpcodeBase;
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62 std::vector<uint8_t> StandardOpcodeLengths;
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63 std::vector<const char*> IncludeDirectories;
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64 std::vector<FileNameEntry> FileNames;
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65
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66 // Length of the prologue in bytes.
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67 uint32_t getLength() const {
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68 return PrologueLength + sizeof(TotalLength) + sizeof(Version) +
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69 sizeof(PrologueLength);
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70 }
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71 // Length of the line table data in bytes (not including the prologue).
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72 uint32_t getStatementTableLength() const {
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73 return TotalLength + sizeof(TotalLength) - getLength();
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74 }
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75 int32_t getMaxLineIncrementForSpecialOpcode() const {
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76 return LineBase + (int8_t)LineRange - 1;
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77 }
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78
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79 void clear();
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80 void dump(raw_ostream &OS) const;
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81 bool parse(DataExtractor debug_line_data, uint32_t *offset_ptr);
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82 };
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83
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84 // Standard .debug_line state machine structure.
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85 struct Row {
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86 explicit Row(bool default_is_stmt = false);
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87
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88 /// Called after a row is appended to the matrix.
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89 void postAppend();
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90 void reset(bool default_is_stmt);
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91 void dump(raw_ostream &OS) const;
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92
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93 static bool orderByAddress(const Row& LHS, const Row& RHS) {
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94 return LHS.Address < RHS.Address;
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95 }
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96
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97 // The program-counter value corresponding to a machine instruction
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98 // generated by the compiler.
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99 uint64_t Address;
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100 // An unsigned integer indicating a source line number. Lines are numbered
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101 // beginning at 1. The compiler may emit the value 0 in cases where an
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102 // instruction cannot be attributed to any source line.
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103 uint32_t Line;
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104 // An unsigned integer indicating a column number within a source line.
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105 // Columns are numbered beginning at 1. The value 0 is reserved to indicate
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106 // that a statement begins at the 'left edge' of the line.
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107 uint16_t Column;
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108 // An unsigned integer indicating the identity of the source file
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109 // corresponding to a machine instruction.
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110 uint16_t File;
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111 // An unsigned integer whose value encodes the applicable instruction set
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112 // architecture for the current instruction.
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113 uint8_t Isa;
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114 // An unsigned integer representing the DWARF path discriminator value
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115 // for this location.
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116 uint32_t Discriminator;
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117 // A boolean indicating that the current instruction is the beginning of a
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118 // statement.
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119 uint8_t IsStmt:1,
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120 // A boolean indicating that the current instruction is the
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121 // beginning of a basic block.
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122 BasicBlock:1,
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123 // A boolean indicating that the current address is that of the
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124 // first byte after the end of a sequence of target machine
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125 // instructions.
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126 EndSequence:1,
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127 // A boolean indicating that the current address is one (of possibly
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128 // many) where execution should be suspended for an entry breakpoint
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129 // of a function.
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130 PrologueEnd:1,
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131 // A boolean indicating that the current address is one (of possibly
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132 // many) where execution should be suspended for an exit breakpoint
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133 // of a function.
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134 EpilogueBegin:1;
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135 };
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136
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137 // Represents a series of contiguous machine instructions. Line table for each
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138 // compilation unit may consist of multiple sequences, which are not
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139 // guaranteed to be in the order of ascending instruction address.
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140 struct Sequence {
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141 // Sequence describes instructions at address range [LowPC, HighPC)
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142 // and is described by line table rows [FirstRowIndex, LastRowIndex).
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143 uint64_t LowPC;
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144 uint64_t HighPC;
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145 unsigned FirstRowIndex;
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146 unsigned LastRowIndex;
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147 bool Empty;
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148
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149 Sequence();
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150 void reset();
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151
0
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152 static bool orderByLowPC(const Sequence& LHS, const Sequence& RHS) {
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153 return LHS.LowPC < RHS.LowPC;
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154 }
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155 bool isValid() const {
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156 return !Empty && (LowPC < HighPC) && (FirstRowIndex < LastRowIndex);
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157 }
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158 bool containsPC(uint64_t pc) const {
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159 return (LowPC <= pc && pc < HighPC);
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160 }
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161 };
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162
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163 struct LineTable {
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164 LineTable();
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165
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166 void appendRow(const DWARFDebugLine::Row &R) {
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167 Rows.push_back(R);
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168 }
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169 void appendSequence(const DWARFDebugLine::Sequence &S) {
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170 Sequences.push_back(S);
0
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171 }
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172
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173 // Returns the index of the row with file/line info for a given address,
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174 // or -1 if there is no such row.
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175 uint32_t lookupAddress(uint64_t address) const;
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176
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177 bool lookupAddressRange(uint64_t address, uint64_t size,
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178 std::vector<uint32_t> &result) const;
0
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179
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180 // Extracts filename by its index in filename table in prologue.
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181 // Returns true on success.
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182 bool getFileNameByIndex(uint64_t FileIndex,
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183 DILineInfoSpecifier::FileLineInfoKind Kind,
0
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184 std::string &Result) const;
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185
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186 void dump(raw_ostream &OS) const;
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187 void clear();
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188
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189 /// Parse prologue and all rows.
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190 bool parse(DataExtractor debug_line_data, const RelocAddrMap *RMap,
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191 uint32_t *offset_ptr);
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192
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193 struct Prologue Prologue;
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194 typedef std::vector<Row> RowVector;
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195 typedef RowVector::const_iterator RowIter;
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196 typedef std::vector<Sequence> SequenceVector;
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197 typedef SequenceVector::const_iterator SequenceIter;
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198 RowVector Rows;
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199 SequenceVector Sequences;
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200 };
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201
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202 const LineTable *getLineTable(uint32_t offset) const;
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203 const LineTable *getOrParseLineTable(DataExtractor debug_line_data,
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204 uint32_t offset);
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205
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206 private:
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207 struct ParsingState {
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208 ParsingState(struct LineTable *LT);
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209
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210 void resetRowAndSequence();
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211 void appendRowToMatrix(uint32_t offset);
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212
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213 // Line table we're currently parsing.
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214 struct LineTable *LineTable;
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215 // The row number that starts at zero for the prologue, and increases for
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216 // each row added to the matrix.
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217 unsigned RowNumber;
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218 struct Row Row;
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219 struct Sequence Sequence;
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220 };
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221
0
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222 typedef std::map<uint32_t, LineTable> LineTableMapTy;
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223 typedef LineTableMapTy::iterator LineTableIter;
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224 typedef LineTableMapTy::const_iterator LineTableConstIter;
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225
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226 const RelocAddrMap *RelocMap;
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227 LineTableMapTy LineTableMap;
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228 };
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229
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230 }
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231
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232 #endif