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annotate include/llvm/MC/MCLinkerOptimizationHint.h @ 95:afa8332a0e37 LLVM3.8

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LLVM 3.8
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Tue, 13 Oct 2015 17:48:58 +0900
parents 60c9769439b8
children 1172e4bd9c6f
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1 //===- MCLinkerOptimizationHint.h - LOH interface ---------------*- C++ -*-===//
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2 //
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3 //
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4 // The LLVM Compiler Infrastructure
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5 //
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6 // This file is distributed under the University of Illinois Open Source
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7 // License. See LICENSE.TXT for details.
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8 //
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9 //===----------------------------------------------------------------------===//
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10 //
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11 // This file declares some helpers classes to handle Linker Optimization Hint
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12 // (LOH).
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13 //
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14 // FIXME: LOH interface supports only MachO format at the moment.
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15 //===----------------------------------------------------------------------===//
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16
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17 #ifndef LLVM_MC_MCLINKEROPTIMIZATIONHINT_H
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18 #define LLVM_MC_MCLINKEROPTIMIZATIONHINT_H
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19
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20 #include "llvm/ADT/SmallVector.h"
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21 #include "llvm/ADT/StringRef.h"
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22 #include "llvm/ADT/StringSwitch.h"
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23 #include "llvm/MC/MCMachObjectWriter.h"
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24 #include "llvm/Support/raw_ostream.h"
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25
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26 namespace llvm {
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27
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28 // Forward declarations.
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29 class MCAsmLayout;
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30 class MCSymbol;
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31
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32 /// Linker Optimization Hint Type.
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33 enum MCLOHType {
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34 MCLOH_AdrpAdrp = 0x1u, ///< Adrp xY, _v1@PAGE -> Adrp xY, _v2@PAGE.
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35 MCLOH_AdrpLdr = 0x2u, ///< Adrp _v@PAGE -> Ldr _v@PAGEOFF.
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36 MCLOH_AdrpAddLdr = 0x3u, ///< Adrp _v@PAGE -> Add _v@PAGEOFF -> Ldr.
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37 MCLOH_AdrpLdrGotLdr = 0x4u, ///< Adrp _v@GOTPAGE -> Ldr _v@GOTPAGEOFF -> Ldr.
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38 MCLOH_AdrpAddStr = 0x5u, ///< Adrp _v@PAGE -> Add _v@PAGEOFF -> Str.
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39 MCLOH_AdrpLdrGotStr = 0x6u, ///< Adrp _v@GOTPAGE -> Ldr _v@GOTPAGEOFF -> Str.
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40 MCLOH_AdrpAdd = 0x7u, ///< Adrp _v@PAGE -> Add _v@PAGEOFF.
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41 MCLOH_AdrpLdrGot = 0x8u ///< Adrp _v@GOTPAGE -> Ldr _v@GOTPAGEOFF.
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42 };
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43
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44 static inline StringRef MCLOHDirectiveName() {
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45 return StringRef(".loh");
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46 }
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47
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48 static inline bool isValidMCLOHType(unsigned Kind) {
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49 return Kind >= MCLOH_AdrpAdrp && Kind <= MCLOH_AdrpLdrGot;
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50 }
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51
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52 static inline int MCLOHNameToId(StringRef Name) {
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53 #define MCLOHCaseNameToId(Name) .Case(#Name, MCLOH_ ## Name)
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54 return StringSwitch<int>(Name)
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55 MCLOHCaseNameToId(AdrpAdrp)
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56 MCLOHCaseNameToId(AdrpLdr)
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57 MCLOHCaseNameToId(AdrpAddLdr)
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58 MCLOHCaseNameToId(AdrpLdrGotLdr)
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59 MCLOHCaseNameToId(AdrpAddStr)
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60 MCLOHCaseNameToId(AdrpLdrGotStr)
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61 MCLOHCaseNameToId(AdrpAdd)
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62 MCLOHCaseNameToId(AdrpLdrGot)
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63 .Default(-1);
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64 }
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65
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66 static inline StringRef MCLOHIdToName(MCLOHType Kind) {
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67 #define MCLOHCaseIdToName(Name) case MCLOH_ ## Name: return StringRef(#Name);
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68 switch (Kind) {
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69 MCLOHCaseIdToName(AdrpAdrp);
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70 MCLOHCaseIdToName(AdrpLdr);
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71 MCLOHCaseIdToName(AdrpAddLdr);
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72 MCLOHCaseIdToName(AdrpLdrGotLdr);
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73 MCLOHCaseIdToName(AdrpAddStr);
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74 MCLOHCaseIdToName(AdrpLdrGotStr);
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75 MCLOHCaseIdToName(AdrpAdd);
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76 MCLOHCaseIdToName(AdrpLdrGot);
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77 }
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78 return StringRef();
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79 }
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80
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81 static inline int MCLOHIdToNbArgs(MCLOHType Kind) {
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82 switch (Kind) {
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83 // LOH with two arguments
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84 case MCLOH_AdrpAdrp:
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85 case MCLOH_AdrpLdr:
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86 case MCLOH_AdrpAdd:
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87 case MCLOH_AdrpLdrGot:
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88 return 2;
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89 // LOH with three arguments
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90 case MCLOH_AdrpAddLdr:
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91 case MCLOH_AdrpLdrGotLdr:
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92 case MCLOH_AdrpAddStr:
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93 case MCLOH_AdrpLdrGotStr:
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94 return 3;
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95 }
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96 return -1;
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97 }
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98
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99 /// Store Linker Optimization Hint information (LOH).
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100 class MCLOHDirective {
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101 MCLOHType Kind;
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102
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103 /// Arguments of this directive. Order matters.
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104 SmallVector<MCSymbol *, 3> Args;
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105
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106 /// Emit this directive in \p OutStream using the information available
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107 /// in the given \p ObjWriter and \p Layout to get the address of the
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108 /// arguments within the object file.
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109 void emit_impl(raw_ostream &OutStream, const MachObjectWriter &ObjWriter,
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110 const MCAsmLayout &Layout) const;
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111
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112 public:
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113 typedef SmallVectorImpl<MCSymbol *> LOHArgs;
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114
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115 MCLOHDirective(MCLOHType Kind, const LOHArgs &Args)
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116 : Kind(Kind), Args(Args.begin(), Args.end()) {
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117 assert(isValidMCLOHType(Kind) && "Invalid LOH directive type!");
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118 }
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119
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120 MCLOHType getKind() const { return Kind; }
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121
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122 const LOHArgs &getArgs() const { return Args; }
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123
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124 /// Emit this directive as:
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125 /// <kind, numArgs, addr1, ..., addrN>
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126 void emit(MachObjectWriter &ObjWriter, const MCAsmLayout &Layout) const {
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127 raw_ostream &OutStream = ObjWriter.getStream();
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128 emit_impl(OutStream, ObjWriter, Layout);
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129 }
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130
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131 /// Get the size in bytes of this directive if emitted in \p ObjWriter with
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132 /// the given \p Layout.
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133 uint64_t getEmitSize(const MachObjectWriter &ObjWriter,
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134 const MCAsmLayout &Layout) const {
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135 class raw_counting_ostream : public raw_ostream {
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136 uint64_t Count;
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137
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138 void write_impl(const char *, size_t size) override { Count += size; }
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139
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140 uint64_t current_pos() const override { return Count; }
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141
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142 public:
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143 raw_counting_ostream() : Count(0) {}
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144 ~raw_counting_ostream() override { flush(); }
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145 };
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146
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147 raw_counting_ostream OutStream;
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148 emit_impl(OutStream, ObjWriter, Layout);
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149 return OutStream.tell();
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150 }
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151 };
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152
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153 class MCLOHContainer {
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154 /// Keep track of the emit size of all the LOHs.
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155 mutable uint64_t EmitSize;
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156
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157 /// Keep track of all LOH directives.
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158 SmallVector<MCLOHDirective, 32> Directives;
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159
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160 public:
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161 typedef SmallVectorImpl<MCLOHDirective> LOHDirectives;
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162
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163 MCLOHContainer() : EmitSize(0) {}
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164
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165 /// Const accessor to the directives.
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166 const LOHDirectives &getDirectives() const {
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167 return Directives;
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168 }
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169
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170 /// Add the directive of the given kind \p Kind with the given arguments
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171 /// \p Args to the container.
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172 void addDirective(MCLOHType Kind, const MCLOHDirective::LOHArgs &Args) {
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173 Directives.push_back(MCLOHDirective(Kind, Args));
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174 }
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175
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176 /// Get the size of the directives if emitted.
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177 uint64_t getEmitSize(const MachObjectWriter &ObjWriter,
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178 const MCAsmLayout &Layout) const {
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179 if (!EmitSize) {
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180 for (const MCLOHDirective &D : Directives)
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181 EmitSize += D.getEmitSize(ObjWriter, Layout);
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182 }
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183 return EmitSize;
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184 }
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185
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186 /// Emit all Linker Optimization Hint in one big table.
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187 /// Each line of the table is emitted by LOHDirective::emit.
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188 void emit(MachObjectWriter &ObjWriter, const MCAsmLayout &Layout) const {
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189 for (const MCLOHDirective &D : Directives)
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190 D.emit(ObjWriter, Layout);
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191 }
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192
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193 void reset() {
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194 Directives.clear();
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195 EmitSize = 0;
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196 }
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197 };
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198
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199 // Add types for specialized template using MCSymbol.
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200 typedef MCLOHDirective::LOHArgs MCLOHArgs;
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201 typedef MCLOHContainer::LOHDirectives MCLOHDirectives;
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202
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203 } // end namespace llvm
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204
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205 #endif