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annotate lib/CodeGen/AsmPrinter/DIE.h @ 33:e4204d083e25 LLVM3.5

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LLVM 3.5
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Thu, 12 Dec 2013 14:32:10 +0900
parents 95c75e76d11b
children 54457678186b
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1 //===--- lib/CodeGen/DIE.h - DWARF Info Entries -----------------*- 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 // Data structures for DWARF info entries.
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11 //
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12 //===----------------------------------------------------------------------===//
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13
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14 #ifndef CODEGEN_ASMPRINTER_DIE_H__
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15 #define CODEGEN_ASMPRINTER_DIE_H__
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16
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17 #include "llvm/ADT/FoldingSet.h"
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18 #include "llvm/ADT/SmallVector.h"
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19 #include "llvm/Support/Compiler.h"
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20 #include "llvm/Support/Dwarf.h"
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21 #include "llvm/MC/MCExpr.h"
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22 #include <vector>
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23
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24 namespace llvm {
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25 class AsmPrinter;
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26 class MCSymbol;
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27 class MCSymbolRefExpr;
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28 class raw_ostream;
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29
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30 //===--------------------------------------------------------------------===//
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31 /// DIEAbbrevData - Dwarf abbreviation data, describes one attribute of a
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32 /// Dwarf abbreviation.
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33 class DIEAbbrevData {
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34 /// Attribute - Dwarf attribute code.
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35 ///
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36 dwarf::Attribute Attribute;
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37
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38 /// Form - Dwarf form code.
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39 ///
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40 dwarf::Form Form;
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41 public:
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42 DIEAbbrevData(dwarf::Attribute A, dwarf::Form F) : Attribute(A), Form(F) {}
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43
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44 // Accessors.
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45 dwarf::Attribute getAttribute() const { return Attribute; }
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46 dwarf::Form getForm() const { return Form; }
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47
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48 /// Profile - Used to gather unique data for the abbreviation folding set.
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49 ///
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50 void Profile(FoldingSetNodeID &ID) const;
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51 };
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52
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53 //===--------------------------------------------------------------------===//
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54 /// DIEAbbrev - Dwarf abbreviation, describes the organization of a debug
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55 /// information object.
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56 class DIEAbbrev : public FoldingSetNode {
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57 /// Tag - Dwarf tag code.
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58 ///
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59 dwarf::Tag Tag;
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60
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61 /// ChildrenFlag - Dwarf children flag.
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62 ///
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63 uint16_t ChildrenFlag;
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64
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65 /// Unique number for node.
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66 ///
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67 unsigned Number;
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68
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69 /// Data - Raw data bytes for abbreviation.
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70 ///
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71 SmallVector<DIEAbbrevData, 12> Data;
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72
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73 public:
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74 DIEAbbrev(dwarf::Tag T, uint16_t C) : Tag(T), ChildrenFlag(C), Data() {}
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75
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76 // Accessors.
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77 dwarf::Tag getTag() const { return Tag; }
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78 unsigned getNumber() const { return Number; }
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79 uint16_t getChildrenFlag() const { return ChildrenFlag; }
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80 const SmallVectorImpl<DIEAbbrevData> &getData() const { return Data; }
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81 void setChildrenFlag(uint16_t CF) { ChildrenFlag = CF; }
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82 void setNumber(unsigned N) { Number = N; }
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83
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84 /// AddAttribute - Adds another set of attribute information to the
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85 /// abbreviation.
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86 void AddAttribute(dwarf::Attribute Attribute, dwarf::Form Form) {
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87 Data.push_back(DIEAbbrevData(Attribute, Form));
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88 }
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89
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90 /// Profile - Used to gather unique data for the abbreviation folding set.
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91 ///
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92 void Profile(FoldingSetNodeID &ID) const;
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93
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94 /// Emit - Print the abbreviation using the specified asm printer.
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95 ///
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96 void Emit(AsmPrinter *AP) const;
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97
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98 #ifndef NDEBUG
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99 void print(raw_ostream &O);
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100 void dump();
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101 #endif
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102 };
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103
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104 //===--------------------------------------------------------------------===//
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105 /// DIE - A structured debug information entry. Has an abbreviation which
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106 /// describes its organization.
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107 class DIEValue;
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108
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109 class DIE {
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110 protected:
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111 /// Offset - Offset in debug info section.
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112 ///
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113 unsigned Offset;
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114
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115 /// Size - Size of instance + children.
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116 ///
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117 unsigned Size;
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118
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119 /// Abbrev - Buffer for constructing abbreviation.
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120 ///
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121 DIEAbbrev Abbrev;
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122
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123 /// Children DIEs.
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124 ///
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125 std::vector<DIE *> Children;
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126
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127 DIE *Parent;
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128
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129 /// Attribute values.
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130 ///
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131 SmallVector<DIEValue*, 12> Values;
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132
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133 public:
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134 explicit DIE(unsigned Tag)
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135 : Offset(0), Size(0), Abbrev((dwarf::Tag)Tag, dwarf::DW_CHILDREN_no),
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136 Parent(0) {}
33
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137 ~DIE();
0
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138
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139 // Accessors.
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140 DIEAbbrev &getAbbrev() { return Abbrev; }
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141 const DIEAbbrev &getAbbrev() const { return Abbrev; }
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142 unsigned getAbbrevNumber() const { return Abbrev.getNumber(); }
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143 dwarf::Tag getTag() const { return Abbrev.getTag(); }
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144 unsigned getOffset() const { return Offset; }
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145 unsigned getSize() const { return Size; }
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146 const std::vector<DIE *> &getChildren() const { return Children; }
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147 const SmallVectorImpl<DIEValue*> &getValues() const { return Values; }
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148 DIE *getParent() const { return Parent; }
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149 /// Climb up the parent chain to get the compile or type unit DIE this DIE
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150 /// belongs to.
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151 const DIE *getUnit() const;
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152 /// Similar to getUnit, returns null when DIE is not added to an
0
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153 /// owner yet.
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154 const DIE *getUnitOrNull() const;
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155 void setOffset(unsigned O) { Offset = O; }
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156 void setSize(unsigned S) { Size = S; }
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157
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158 /// addValue - Add a value and attributes to a DIE.
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159 ///
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160 void addValue(dwarf::Attribute Attribute, dwarf::Form Form,
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161 DIEValue *Value) {
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162 Abbrev.AddAttribute(Attribute, Form);
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163 Values.push_back(Value);
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164 }
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165
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166 /// addChild - Add a child to the DIE.
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167 ///
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168 void addChild(DIE *Child) {
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169 assert(!Child->getParent());
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170 Abbrev.setChildrenFlag(dwarf::DW_CHILDREN_yes);
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171 Children.push_back(Child);
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172 Child->Parent = this;
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173 }
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174
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175 /// findAttribute - Find a value in the DIE with the attribute given,
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176 /// returns NULL if no such attribute exists.
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177 DIEValue *findAttribute(uint16_t Attribute) const;
0
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178
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179 #ifndef NDEBUG
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180 void print(raw_ostream &O, unsigned IndentCount = 0) const;
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181 void dump();
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182 #endif
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183 };
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184
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185 //===--------------------------------------------------------------------===//
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186 /// DIEValue - A debug information entry value.
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187 ///
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188 class DIEValue {
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189 virtual void anchor();
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190 public:
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191 enum {
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192 isInteger,
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193 isString,
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194 isExpr,
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195 isLabel,
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196 isDelta,
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197 isEntry,
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198 isBlock
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199 };
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200 protected:
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201 /// Type - Type of data stored in the value.
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202 ///
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203 unsigned Type;
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204 public:
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205 explicit DIEValue(unsigned T) : Type(T) {}
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206 virtual ~DIEValue() {}
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207
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208 // Accessors
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209 unsigned getType() const { return Type; }
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210
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211 /// EmitValue - Emit value via the Dwarf writer.
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212 ///
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213 virtual void EmitValue(AsmPrinter *AP, dwarf::Form Form) const = 0;
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214
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215 /// SizeOf - Return the size of a value in bytes.
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216 ///
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217 virtual unsigned SizeOf(AsmPrinter *AP, dwarf::Form Form) const = 0;
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218
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219 #ifndef NDEBUG
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220 virtual void print(raw_ostream &O) const = 0;
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221 void dump() const;
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222 #endif
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223 };
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224
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225 //===--------------------------------------------------------------------===//
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226 /// DIEInteger - An integer value DIE.
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227 ///
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228 class DIEInteger : public DIEValue {
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229 uint64_t Integer;
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230 public:
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231 explicit DIEInteger(uint64_t I) : DIEValue(isInteger), Integer(I) {}
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232
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233 /// BestForm - Choose the best form for integer.
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234 ///
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235 static dwarf::Form BestForm(bool IsSigned, uint64_t Int) {
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236 if (IsSigned) {
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237 const int64_t SignedInt = Int;
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238 if ((char)Int == SignedInt) return dwarf::DW_FORM_data1;
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239 if ((short)Int == SignedInt) return dwarf::DW_FORM_data2;
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240 if ((int)Int == SignedInt) return dwarf::DW_FORM_data4;
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241 } else {
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242 if ((unsigned char)Int == Int) return dwarf::DW_FORM_data1;
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243 if ((unsigned short)Int == Int) return dwarf::DW_FORM_data2;
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244 if ((unsigned int)Int == Int) return dwarf::DW_FORM_data4;
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245 }
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246 return dwarf::DW_FORM_data8;
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247 }
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248
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249 /// EmitValue - Emit integer of appropriate size.
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250 ///
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251 virtual void EmitValue(AsmPrinter *AP, dwarf::Form Form) const;
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252
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253 uint64_t getValue() const { return Integer; }
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254
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255 /// SizeOf - Determine size of integer value in bytes.
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256 ///
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257 virtual unsigned SizeOf(AsmPrinter *AP, dwarf::Form Form) const;
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258
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259 // Implement isa/cast/dyncast.
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260 static bool classof(const DIEValue *I) { return I->getType() == isInteger; }
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261
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262 #ifndef NDEBUG
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263 virtual void print(raw_ostream &O) const;
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264 #endif
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265 };
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266
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267 //===--------------------------------------------------------------------===//
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268 /// DIEExpr - An expression DIE.
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269 //
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270 class DIEExpr : public DIEValue {
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271 const MCExpr *Expr;
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272 public:
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273 explicit DIEExpr(const MCExpr *E) : DIEValue(isExpr), Expr(E) {}
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274
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275 /// EmitValue - Emit expression value.
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276 ///
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277 virtual void EmitValue(AsmPrinter *AP, dwarf::Form Form) const;
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278
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279 /// getValue - Get MCExpr.
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280 ///
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281 const MCExpr *getValue() const { return Expr; }
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282
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283 /// SizeOf - Determine size of expression value in bytes.
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284 ///
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285 virtual unsigned SizeOf(AsmPrinter *AP, dwarf::Form Form) const;
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286
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287 // Implement isa/cast/dyncast.
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288 static bool classof(const DIEValue *E) { return E->getType() == isExpr; }
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289
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290 #ifndef NDEBUG
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291 virtual void print(raw_ostream &O) const;
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292 #endif
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293 };
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294
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295 //===--------------------------------------------------------------------===//
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296 /// DIELabel - A label DIE.
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297 //
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298 class DIELabel : public DIEValue {
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299 const MCSymbol *Label;
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300 public:
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301 explicit DIELabel(const MCSymbol *L) : DIEValue(isLabel), Label(L) {}
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302
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303 /// EmitValue - Emit label value.
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304 ///
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305 virtual void EmitValue(AsmPrinter *AP, dwarf::Form Form) const;
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306
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307 /// getValue - Get MCSymbol.
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308 ///
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309 const MCSymbol *getValue() const { return Label; }
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310
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311 /// SizeOf - Determine size of label value in bytes.
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312 ///
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313 virtual unsigned SizeOf(AsmPrinter *AP, dwarf::Form Form) const;
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314
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315 // Implement isa/cast/dyncast.
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316 static bool classof(const DIEValue *L) { return L->getType() == isLabel; }
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317
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318 #ifndef NDEBUG
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319 virtual void print(raw_ostream &O) const;
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320 #endif
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321 };
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322
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323 //===--------------------------------------------------------------------===//
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324 /// DIEDelta - A simple label difference DIE.
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325 ///
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326 class DIEDelta : public DIEValue {
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327 const MCSymbol *LabelHi;
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328 const MCSymbol *LabelLo;
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329 public:
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330 DIEDelta(const MCSymbol *Hi, const MCSymbol *Lo)
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331 : DIEValue(isDelta), LabelHi(Hi), LabelLo(Lo) {}
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332
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333 /// EmitValue - Emit delta value.
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334 ///
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335 virtual void EmitValue(AsmPrinter *AP, dwarf::Form Form) const;
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336
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337 /// SizeOf - Determine size of delta value in bytes.
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338 ///
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339 virtual unsigned SizeOf(AsmPrinter *AP, dwarf::Form Form) const;
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340
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341 // Implement isa/cast/dyncast.
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342 static bool classof(const DIEValue *D) { return D->getType() == isDelta; }
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343
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344 #ifndef NDEBUG
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345 virtual void print(raw_ostream &O) const;
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346 #endif
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347 };
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348
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349 //===--------------------------------------------------------------------===//
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350 /// DIEString - A container for string values.
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351 ///
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352 class DIEString : public DIEValue {
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353 const DIEValue *Access;
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354 const StringRef Str;
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355
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356 public:
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357 DIEString(const DIEValue *Acc, const StringRef S)
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358 : DIEValue(isString), Access(Acc), Str(S) {}
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359
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360 /// getString - Grab the string out of the object.
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361 StringRef getString() const { return Str; }
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diff changeset
362
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363 /// EmitValue - Emit delta value.
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364 ///
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365 virtual void EmitValue(AsmPrinter *AP, dwarf::Form Form) const;
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366
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367 /// SizeOf - Determine size of delta value in bytes.
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368 ///
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369 virtual unsigned SizeOf(AsmPrinter *AP, dwarf::Form Form) const;
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370
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371 // Implement isa/cast/dyncast.
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diff changeset
372 static bool classof(const DIEValue *D) { return D->getType() == isString; }
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diff changeset
373
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diff changeset
374 #ifndef NDEBUG
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375 virtual void print(raw_ostream &O) const;
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diff changeset
376 #endif
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diff changeset
377 };
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diff changeset
378
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379 //===--------------------------------------------------------------------===//
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380 /// DIEEntry - A pointer to another debug information entry. An instance of
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381 /// this class can also be used as a proxy for a debug information entry not
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382 /// yet defined (ie. types.)
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diff changeset
383 class DIEEntry : public DIEValue {
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diff changeset
384 DIE *const Entry;
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diff changeset
385 public:
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diff changeset
386 explicit DIEEntry(DIE *E) : DIEValue(isEntry), Entry(E) {
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diff changeset
387 assert(E && "Cannot construct a DIEEntry with a null DIE");
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388 }
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389
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diff changeset
390 DIE *getEntry() const { return Entry; }
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diff changeset
391
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diff changeset
392 /// EmitValue - Emit debug information entry offset.
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diff changeset
393 ///
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394 virtual void EmitValue(AsmPrinter *AP, dwarf::Form Form) const;
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diff changeset
395
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396 /// SizeOf - Determine size of debug information entry in bytes.
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diff changeset
397 ///
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diff changeset
398 virtual unsigned SizeOf(AsmPrinter *AP, dwarf::Form Form) const {
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diff changeset
399 return Form == dwarf::DW_FORM_ref_addr ? getRefAddrSize(AP)
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diff changeset
400 : sizeof(int32_t);
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diff changeset
401 }
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parents:
diff changeset
402
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parents:
diff changeset
403 /// Returns size of a ref_addr entry.
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404 static unsigned getRefAddrSize(AsmPrinter *AP);
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405
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406 // Implement isa/cast/dyncast.
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407 static bool classof(const DIEValue *E) { return E->getType() == isEntry; }
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408
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409 #ifndef NDEBUG
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410 virtual void print(raw_ostream &O) const;
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411 #endif
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412 };
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413
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414 //===--------------------------------------------------------------------===//
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415 /// DIEBlock - A block of values. Primarily used for location expressions.
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416 //
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417 class DIEBlock : public DIEValue, public DIE {
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418 unsigned Size; // Size in bytes excluding size header.
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419 public:
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420 DIEBlock() : DIEValue(isBlock), DIE(0), Size(0) {}
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421
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422 /// ComputeSize - calculate the size of the block.
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423 ///
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424 unsigned ComputeSize(AsmPrinter *AP);
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425
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426 /// BestForm - Choose the best form for data.
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427 ///
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428 dwarf::Form BestForm() const {
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429 if ((unsigned char)Size == Size) return dwarf::DW_FORM_block1;
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430 if ((unsigned short)Size == Size) return dwarf::DW_FORM_block2;
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431 if ((unsigned int)Size == Size) return dwarf::DW_FORM_block4;
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432 return dwarf::DW_FORM_block;
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433 }
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434
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435 /// EmitValue - Emit block data.
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436 ///
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437 virtual void EmitValue(AsmPrinter *AP, dwarf::Form Form) const;
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438
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439 /// SizeOf - Determine size of block data in bytes.
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440 ///
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441 virtual unsigned SizeOf(AsmPrinter *AP, dwarf::Form Form) const;
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442
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443 // Implement isa/cast/dyncast.
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444 static bool classof(const DIEValue *E) { return E->getType() == isBlock; }
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445
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446 #ifndef NDEBUG
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447 virtual void print(raw_ostream &O) const;
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448 #endif
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449 };
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450
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451 } // end llvm namespace
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452
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453 #endif