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annotate include/llvm/MC/MCAsmBackend.h @ 0:95c75e76d11b LLVM3.4

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LLVM 3.4
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Thu, 12 Dec 2013 13:56:28 +0900
parents
children 54457678186b
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1 //===-- llvm/MC/MCAsmBack.h - MC Asm Backend --------------------*- 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_MC_MCASMBACKEND_H
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11 #define LLVM_MC_MCASMBACKEND_H
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12
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13 #include "llvm/ADT/ArrayRef.h"
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14 #include "llvm/MC/MCDirectives.h"
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15 #include "llvm/MC/MCDwarf.h"
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16 #include "llvm/MC/MCFixup.h"
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17 #include "llvm/Support/DataTypes.h"
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18 #include "llvm/Support/ErrorHandling.h"
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19
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20 namespace llvm {
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21 class MCAsmLayout;
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22 class MCAssembler;
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23 class MCELFObjectTargetWriter;
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24 struct MCFixupKindInfo;
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25 class MCFragment;
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26 class MCInst;
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27 class MCRelaxableFragment;
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28 class MCObjectWriter;
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29 class MCSection;
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30 class MCValue;
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31 class raw_ostream;
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32
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33 /// MCAsmBackend - Generic interface to target specific assembler backends.
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34 class MCAsmBackend {
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35 MCAsmBackend(const MCAsmBackend &) LLVM_DELETED_FUNCTION;
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36 void operator=(const MCAsmBackend &) LLVM_DELETED_FUNCTION;
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37
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38 protected: // Can only create subclasses.
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39 MCAsmBackend();
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40
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41 unsigned HasReliableSymbolDifference : 1;
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42 unsigned HasDataInCodeSupport : 1;
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43
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44 public:
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45 virtual ~MCAsmBackend();
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46
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47 /// lifetime management
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48 virtual void reset() {}
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49
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50 /// createObjectWriter - Create a new MCObjectWriter instance for use by the
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51 /// assembler backend to emit the final object file.
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52 virtual MCObjectWriter *createObjectWriter(raw_ostream &OS) const = 0;
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53
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54 /// createELFObjectTargetWriter - Create a new ELFObjectTargetWriter to enable
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55 /// non-standard ELFObjectWriters.
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56 virtual MCELFObjectTargetWriter *createELFObjectTargetWriter() const {
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57 llvm_unreachable("createELFObjectTargetWriter is not supported by asm "
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58 "backend");
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59 }
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60
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61 /// hasReliableSymbolDifference - Check whether this target implements
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62 /// accurate relocations for differences between symbols. If not, differences
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63 /// between symbols will always be relocatable expressions and any references
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64 /// to temporary symbols will be assumed to be in the same atom, unless they
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65 /// reside in a different section.
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66 ///
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67 /// This should always be true (since it results in fewer relocations with no
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68 /// loss of functionality), but is currently supported as a way to maintain
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69 /// exact object compatibility with Darwin 'as' (on non-x86_64). It should
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70 /// eventually should be eliminated.
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71 bool hasReliableSymbolDifference() const {
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72 return HasReliableSymbolDifference;
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73 }
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74
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75 /// hasDataInCodeSupport - Check whether this target implements data-in-code
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76 /// markers. If not, data region directives will be ignored.
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77 bool hasDataInCodeSupport() const { return HasDataInCodeSupport; }
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78
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79 /// doesSectionRequireSymbols - Check whether the given section requires that
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80 /// all symbols (even temporaries) have symbol table entries.
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81 virtual bool doesSectionRequireSymbols(const MCSection &Section) const {
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82 return false;
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83 }
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84
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85 /// isSectionAtomizable - Check whether the given section can be split into
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86 /// atoms.
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87 ///
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88 /// \see MCAssembler::isSymbolLinkerVisible().
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89 virtual bool isSectionAtomizable(const MCSection &Section) const {
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90 return true;
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91 }
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92
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93 /// @name Target Fixup Interfaces
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94 /// @{
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95
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96 /// getNumFixupKinds - Get the number of target specific fixup kinds.
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97 virtual unsigned getNumFixupKinds() const = 0;
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98
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99 /// getFixupKindInfo - Get information on a fixup kind.
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100 virtual const MCFixupKindInfo &getFixupKindInfo(MCFixupKind Kind) const;
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101
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102 /// processFixupValue - Target hook to adjust the literal value of a fixup
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103 /// if necessary. IsResolved signals whether the caller believes a relocation
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104 /// is needed; the target can modify the value. The default does nothing.
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105 virtual void processFixupValue(const MCAssembler &Asm,
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106 const MCAsmLayout &Layout,
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107 const MCFixup &Fixup, const MCFragment *DF,
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108 MCValue &Target, uint64_t &Value,
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109 bool &IsResolved) {}
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110
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111 /// @}
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112
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113 /// applyFixup - Apply the \p Value for given \p Fixup into the provided
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114 /// data fragment, at the offset specified by the fixup and following the
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115 /// fixup kind as appropriate.
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116 virtual void applyFixup(const MCFixup &Fixup, char *Data, unsigned DataSize,
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117 uint64_t Value) const = 0;
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118
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119 /// @}
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120
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121 /// @name Target Relaxation Interfaces
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122 /// @{
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123
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124 /// mayNeedRelaxation - Check whether the given instruction may need
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125 /// relaxation.
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126 ///
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127 /// \param Inst - The instruction to test.
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128 virtual bool mayNeedRelaxation(const MCInst &Inst) const = 0;
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129
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130 /// fixupNeedsRelaxation - Target specific predicate for whether a given
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131 /// fixup requires the associated instruction to be relaxed.
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132 virtual bool fixupNeedsRelaxation(const MCFixup &Fixup, uint64_t Value,
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133 const MCRelaxableFragment *DF,
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134 const MCAsmLayout &Layout) const = 0;
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135
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136 /// RelaxInstruction - Relax the instruction in the given fragment to the next
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137 /// wider instruction.
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138 ///
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139 /// \param Inst The instruction to relax, which may be the same as the
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140 /// output.
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141 /// \param [out] Res On return, the relaxed instruction.
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142 virtual void relaxInstruction(const MCInst &Inst, MCInst &Res) const = 0;
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143
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144 /// @}
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145
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146 /// getMinimumNopSize - Returns the minimum size of a nop in bytes on this
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147 /// target. The assembler will use this to emit excess padding in situations
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148 /// where the padding required for simple alignment would be less than the
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149 /// minimum nop size.
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150 ///
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151 virtual unsigned getMinimumNopSize() const { return 1; }
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152
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153 /// writeNopData - Write an (optimal) nop sequence of Count bytes to the given
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154 /// output. If the target cannot generate such a sequence, it should return an
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155 /// error.
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156 ///
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157 /// \return - True on success.
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158 virtual bool writeNopData(uint64_t Count, MCObjectWriter *OW) const = 0;
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159
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160 /// handleAssemblerFlag - Handle any target-specific assembler flags.
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161 /// By default, do nothing.
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162 virtual void handleAssemblerFlag(MCAssemblerFlag Flag) {}
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163
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164 /// \brief Generate the compact unwind encoding for the CFI instructions.
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165 virtual uint32_t
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166 generateCompactUnwindEncoding(ArrayRef<MCCFIInstruction>) const {
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167 return 0;
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168 }
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169 };
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170
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171 } // End llvm namespace
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172
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173 #endif