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1 //===- MCSymbol.h - Machine Code Symbols ------------------------*- 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 // This file contains the declaration of the MCSymbol class.
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11 //
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12 //===----------------------------------------------------------------------===//
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13
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14 #ifndef LLVM_MC_MCSYMBOL_H
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15 #define LLVM_MC_MCSYMBOL_H
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16
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95
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17 #include "llvm/ADT/PointerIntPair.h"
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18 #include "llvm/ADT/StringMap.h"
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121
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19 #include "llvm/ADT/StringRef.h"
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120
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20 #include "llvm/MC/MCFragment.h"
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121
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21 #include "llvm/Support/ErrorHandling.h"
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22 #include "llvm/Support/MathExtras.h"
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23 #include <cassert>
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24 #include <cstddef>
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25 #include <cstdint>
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26
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27 namespace llvm {
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121
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28
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29 class MCAsmInfo;
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121
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30 class MCContext;
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95
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31 class MCExpr;
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32 class MCSection;
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33 class raw_ostream;
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34
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35 /// MCSymbol - Instances of this class represent a symbol name in the MC file,
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36 /// and MCSymbols are created and uniqued by the MCContext class. MCSymbols
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37 /// should only be constructed with valid names for the object file.
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38 ///
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39 /// If the symbol is defined/emitted into the current translation unit, the
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40 /// Section member is set to indicate what section it lives in. Otherwise, if
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41 /// it is a reference to an external entity, it has a null section.
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42 class MCSymbol {
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43 protected:
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44 /// The kind of the symbol. If it is any value other than unset then this
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45 /// class is actually one of the appropriate subclasses of MCSymbol.
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46 enum SymbolKind {
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47 SymbolKindUnset,
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48 SymbolKindCOFF,
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49 SymbolKindELF,
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50 SymbolKindMachO,
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51 SymbolKindWasm,
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52 };
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53
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54 /// A symbol can contain an Offset, or Value, or be Common, but never more
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55 /// than one of these.
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56 enum Contents : uint8_t {
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57 SymContentsUnset,
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58 SymContentsOffset,
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59 SymContentsVariable,
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60 SymContentsCommon,
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61 };
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62
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63 // Special sentinal value for the absolute pseudo fragment.
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64 static MCFragment *AbsolutePseudoFragment;
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65
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66 /// If a symbol has a Fragment, the section is implied, so we only need
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67 /// one pointer.
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68 /// The special AbsolutePseudoFragment value is for absolute symbols.
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69 /// If this is a variable symbol, this caches the variable value's fragment.
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70 /// FIXME: We might be able to simplify this by having the asm streamer create
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71 /// dummy fragments.
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72 /// If this is a section, then it gives the symbol is defined in. This is null
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73 /// for undefined symbols.
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74 ///
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75 /// If this is a fragment, then it gives the fragment this symbol's value is
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76 /// relative to, if any.
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77 ///
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78 /// For the 'HasName' integer, this is true if this symbol is named.
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79 /// A named symbol will have a pointer to the name allocated in the bytes
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80 /// immediately prior to the MCSymbol.
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81 mutable PointerIntPair<MCFragment *, 1> FragmentAndHasName;
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82
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83 /// IsTemporary - True if this is an assembler temporary label, which
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84 /// typically does not survive in the .o file's symbol table. Usually
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85 /// "Lfoo" or ".foo".
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86 unsigned IsTemporary : 1;
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83
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87
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88 /// \brief True if this symbol can be redefined.
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89 unsigned IsRedefinable : 1;
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90
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91 /// IsUsed - True if this symbol has been used.
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92 mutable unsigned IsUsed : 1;
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93
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94 mutable unsigned IsRegistered : 1;
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95
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95
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96 /// This symbol is visible outside this translation unit.
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97 mutable unsigned IsExternal : 1;
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98
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99 /// This symbol is private extern.
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100 mutable unsigned IsPrivateExtern : 1;
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101
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102 /// LLVM RTTI discriminator. This is actually a SymbolKind enumerator, but is
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103 /// unsigned to avoid sign extension and achieve better bitpacking with MSVC.
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121
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104 unsigned Kind : 3;
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105
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106 /// True if we have created a relocation that uses this symbol.
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107 mutable unsigned IsUsedInReloc : 1;
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108
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109 /// This is actually a Contents enumerator, but is unsigned to avoid sign
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110 /// extension and achieve better bitpacking with MSVC.
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111 unsigned SymbolContents : 2;
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112
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113 /// The alignment of the symbol, if it is 'common', or -1.
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114 ///
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115 /// The alignment is stored as log2(align) + 1. This allows all values from
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116 /// 0 to 2^31 to be stored which is every power of 2 representable by an
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117 /// unsigned.
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118 enum : unsigned { NumCommonAlignmentBits = 5 };
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119 unsigned CommonAlignLog2 : NumCommonAlignmentBits;
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120
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121 /// The Flags field is used by object file implementations to store
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122 /// additional per symbol information which is not easily classified.
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123 enum : unsigned { NumFlagsBits = 16 };
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124 mutable uint32_t Flags : NumFlagsBits;
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125
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126 /// Index field, for use by the object file implementation.
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127 mutable uint32_t Index = 0;
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128
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129 union {
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130 /// The offset to apply to the fragment address to form this symbol's value.
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131 uint64_t Offset;
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132
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133 /// The size of the symbol, if it is 'common'.
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134 uint64_t CommonSize;
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135
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136 /// If non-null, the value for a variable symbol.
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137 const MCExpr *Value;
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138 };
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139
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140 // MCContext creates and uniques these.
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141 friend class MCExpr;
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142 friend class MCContext;
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143
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144 /// \brief The name for a symbol.
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145 /// MCSymbol contains a uint64_t so is probably aligned to 8. On a 32-bit
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146 /// system, the name is a pointer so isn't going to satisfy the 8 byte
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147 /// alignment of uint64_t. Account for that here.
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121
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148 using NameEntryStorageTy = union {
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149 const StringMapEntry<bool> *NameEntry;
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150 uint64_t AlignmentPadding;
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121
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151 };
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152
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153 MCSymbol(SymbolKind Kind, const StringMapEntry<bool> *Name, bool isTemporary)
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154 : IsTemporary(isTemporary), IsRedefinable(false), IsUsed(false),
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155 IsRegistered(false), IsExternal(false), IsPrivateExtern(false),
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156 Kind(Kind), IsUsedInReloc(false), SymbolContents(SymContentsUnset),
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157 CommonAlignLog2(0), Flags(0) {
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158 Offset = 0;
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159 FragmentAndHasName.setInt(!!Name);
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160 if (Name)
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161 getNameEntryPtr() = Name;
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162 }
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163
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164 // Provide custom new/delete as we will only allocate space for a name
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165 // if we need one.
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166 void *operator new(size_t s, const StringMapEntry<bool> *Name,
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167 MCContext &Ctx);
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168
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169 private:
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170 void operator delete(void *);
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171 /// \brief Placement delete - required by std, but never called.
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172 void operator delete(void*, unsigned) {
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173 llvm_unreachable("Constructor throws?");
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174 }
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175 /// \brief Placement delete - required by std, but never called.
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176 void operator delete(void*, unsigned, bool) {
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177 llvm_unreachable("Constructor throws?");
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178 }
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179
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180 MCSection *getSectionPtr(bool SetUsed = true) const {
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181 if (MCFragment *F = getFragment(SetUsed)) {
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182 assert(F != AbsolutePseudoFragment);
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183 return F->getParent();
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184 }
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185 return nullptr;
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186 }
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187
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188 /// \brief Get a reference to the name field. Requires that we have a name
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189 const StringMapEntry<bool> *&getNameEntryPtr() {
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190 assert(FragmentAndHasName.getInt() && "Name is required");
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191 NameEntryStorageTy *Name = reinterpret_cast<NameEntryStorageTy *>(this);
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192 return (*(Name - 1)).NameEntry;
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193 }
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194 const StringMapEntry<bool> *&getNameEntryPtr() const {
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195 return const_cast<MCSymbol*>(this)->getNameEntryPtr();
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196 }
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197
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198 public:
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121
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199 MCSymbol(const MCSymbol &) = delete;
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200 MCSymbol &operator=(const MCSymbol &) = delete;
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201
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202 /// getName - Get the symbol name.
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203 StringRef getName() const {
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204 if (!FragmentAndHasName.getInt())
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205 return StringRef();
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206
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207 return getNameEntryPtr()->first();
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208 }
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209
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210 bool isRegistered() const { return IsRegistered; }
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211 void setIsRegistered(bool Value) const { IsRegistered = Value; }
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212
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213 void setUsedInReloc() const { IsUsedInReloc = true; }
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214 bool isUsedInReloc() const { return IsUsedInReloc; }
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215
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216 /// \name Accessors
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217 /// @{
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218
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219 /// isTemporary - Check if this is an assembler temporary symbol.
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220 bool isTemporary() const { return IsTemporary; }
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221
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222 /// isUsed - Check if this is used.
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223 bool isUsed() const { return IsUsed; }
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224 void setUsed(bool Value) const { IsUsed |= Value; }
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225
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226 /// \brief Check if this symbol is redefinable.
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227 bool isRedefinable() const { return IsRedefinable; }
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228 /// \brief Mark this symbol as redefinable.
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229 void setRedefinable(bool Value) { IsRedefinable = Value; }
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230 /// \brief Prepare this symbol to be redefined.
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231 void redefineIfPossible() {
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232 if (IsRedefinable) {
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233 if (SymbolContents == SymContentsVariable) {
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234 Value = nullptr;
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235 SymbolContents = SymContentsUnset;
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236 }
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237 setUndefined();
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238 IsRedefinable = false;
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239 }
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240 }
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241
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242 /// @}
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243 /// \name Associated Sections
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244 /// @{
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245
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246 /// isDefined - Check if this symbol is defined (i.e., it has an address).
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247 ///
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248 /// Defined symbols are either absolute or in some section.
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249 bool isDefined(bool SetUsed = true) const {
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250 return getFragment(SetUsed) != nullptr;
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251 }
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252
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253 /// isInSection - Check if this symbol is defined in some section (i.e., it
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254 /// is defined but not absolute).
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255 bool isInSection(bool SetUsed = true) const {
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256 return isDefined(SetUsed) && !isAbsolute(SetUsed);
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257 }
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258
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259 /// isUndefined - Check if this symbol undefined (i.e., implicitly defined).
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260 bool isUndefined(bool SetUsed = true) const { return !isDefined(SetUsed); }
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261
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262 /// isAbsolute - Check if this is an absolute symbol.
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263 bool isAbsolute(bool SetUsed = true) const {
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264 return getFragment(SetUsed) == AbsolutePseudoFragment;
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265 }
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266
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267 /// Get the section associated with a defined, non-absolute symbol.
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268 MCSection &getSection(bool SetUsed = true) const {
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269 assert(isInSection(SetUsed) && "Invalid accessor!");
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270 return *getSectionPtr(SetUsed);
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271 }
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272
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273 /// Mark the symbol as defined in the fragment \p F.
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274 void setFragment(MCFragment *F) const {
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275 assert(!isVariable() && "Cannot set fragment of variable");
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276 FragmentAndHasName.setPointer(F);
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277 }
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95
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278
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279 /// Mark the symbol as undefined.
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280 void setUndefined() { FragmentAndHasName.setPointer(nullptr); }
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281
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282 bool isELF() const { return Kind == SymbolKindELF; }
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283
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284 bool isCOFF() const { return Kind == SymbolKindCOFF; }
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285
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286 bool isMachO() const { return Kind == SymbolKindMachO; }
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287
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288 bool isWasm() const { return Kind == SymbolKindWasm; }
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289
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290 /// @}
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291 /// \name Variable Symbols
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292 /// @{
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293
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294 /// isVariable - Check if this is a variable symbol.
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295 bool isVariable() const {
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296 return SymbolContents == SymContentsVariable;
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297 }
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298
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299 /// getVariableValue - Get the value for variable symbols.
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300 const MCExpr *getVariableValue(bool SetUsed = true) const {
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301 assert(isVariable() && "Invalid accessor!");
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302 IsUsed |= SetUsed;
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303 return Value;
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304 }
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305
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306 void setVariableValue(const MCExpr *Value);
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307
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308 /// @}
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309
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310 /// Get the (implementation defined) index.
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311 uint32_t getIndex() const {
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312 return Index;
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313 }
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314
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315 /// Set the (implementation defined) index.
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316 void setIndex(uint32_t Value) const {
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317 Index = Value;
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318 }
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319
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320 uint64_t getOffset() const {
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321 assert((SymbolContents == SymContentsUnset ||
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322 SymbolContents == SymContentsOffset) &&
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323 "Cannot get offset for a common/variable symbol");
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324 return Offset;
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325 }
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326 void setOffset(uint64_t Value) {
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327 assert((SymbolContents == SymContentsUnset ||
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328 SymbolContents == SymContentsOffset) &&
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329 "Cannot set offset for a common/variable symbol");
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330 Offset = Value;
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331 SymbolContents = SymContentsOffset;
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332 }
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333
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334 /// Return the size of a 'common' symbol.
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335 uint64_t getCommonSize() const {
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336 assert(isCommon() && "Not a 'common' symbol!");
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337 return CommonSize;
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338 }
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339
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340 /// Mark this symbol as being 'common'.
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341 ///
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342 /// \param Size - The size of the symbol.
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343 /// \param Align - The alignment of the symbol.
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344 void setCommon(uint64_t Size, unsigned Align) {
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345 assert(getOffset() == 0);
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346 CommonSize = Size;
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347 SymbolContents = SymContentsCommon;
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348
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349 assert((!Align || isPowerOf2_32(Align)) &&
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350 "Alignment must be a power of 2");
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351 unsigned Log2Align = Log2_32(Align) + 1;
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352 assert(Log2Align < (1U << NumCommonAlignmentBits) &&
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353 "Out of range alignment");
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354 CommonAlignLog2 = Log2Align;
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355 }
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356
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357 /// Return the alignment of a 'common' symbol.
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358 unsigned getCommonAlignment() const {
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359 assert(isCommon() && "Not a 'common' symbol!");
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360 return CommonAlignLog2 ? (1U << (CommonAlignLog2 - 1)) : 0;
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361 }
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362
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363 /// Declare this symbol as being 'common'.
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364 ///
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365 /// \param Size - The size of the symbol.
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366 /// \param Align - The alignment of the symbol.
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367 /// \return True if symbol was already declared as a different type
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368 bool declareCommon(uint64_t Size, unsigned Align) {
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369 assert(isCommon() || getOffset() == 0);
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370 if(isCommon()) {
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371 if(CommonSize != Size || getCommonAlignment() != Align)
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372 return true;
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373 } else
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374 setCommon(Size, Align);
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375 return false;
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376 }
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377
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378 /// Is this a 'common' symbol.
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379 bool isCommon() const {
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380 return SymbolContents == SymContentsCommon;
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381 }
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382
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383 MCFragment *getFragment(bool SetUsed = true) const {
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384 MCFragment *Fragment = FragmentAndHasName.getPointer();
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385 if (Fragment || !isVariable())
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386 return Fragment;
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387 Fragment = getVariableValue(SetUsed)->findAssociatedFragment();
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388 FragmentAndHasName.setPointer(Fragment);
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389 return Fragment;
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390 }
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391
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392 bool isExternal() const { return IsExternal; }
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393 void setExternal(bool Value) const { IsExternal = Value; }
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394
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395 bool isPrivateExtern() const { return IsPrivateExtern; }
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396 void setPrivateExtern(bool Value) { IsPrivateExtern = Value; }
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397
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398 /// print - Print the value to the stream \p OS.
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399 void print(raw_ostream &OS, const MCAsmInfo *MAI) const;
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400
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401 /// dump - Print the value to stderr.
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402 void dump() const;
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403
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404 protected:
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405 /// Get the (implementation defined) symbol flags.
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406 uint32_t getFlags() const { return Flags; }
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407
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408 /// Set the (implementation defined) symbol flags.
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409 void setFlags(uint32_t Value) const {
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410 assert(Value < (1U << NumFlagsBits) && "Out of range flags");
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411 Flags = Value;
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412 }
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413
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414 /// Modify the flags via a mask
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415 void modifyFlags(uint32_t Value, uint32_t Mask) const {
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|
416 assert(Value < (1U << NumFlagsBits) && "Out of range flags");
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417 Flags = (Flags & ~Mask) | Value;
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418 }
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|
419 };
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|
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420
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421 inline raw_ostream &operator<<(raw_ostream &OS, const MCSymbol &Sym) {
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|
|
422 Sym.print(OS, nullptr);
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|
|
423 return OS;
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|
|
424 }
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121
|
425
|
0
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
426 } // end namespace llvm
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
427
|
|
121
|
428 #endif // LLVM_MC_MCSYMBOL_H
|
