Mercurial > hg > Members > tobaru > cbc > CbC_llvm
annotate lib/IR/Globals.cpp @ 3:9ad51c7bc036
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author | Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> |
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date | Wed, 15 May 2013 06:43:32 +0900 |
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rev | line source |
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1 //===-- Globals.cpp - Implement the GlobalValue & GlobalVariable class ----===// |
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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 implements the GlobalValue & GlobalVariable classes for the IR |
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11 // library. |
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12 // |
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13 //===----------------------------------------------------------------------===// |
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14 |
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15 #include "llvm/IR/GlobalValue.h" |
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16 #include "llvm/ADT/SmallPtrSet.h" |
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17 #include "llvm/IR/Constants.h" |
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18 #include "llvm/IR/DerivedTypes.h" |
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19 #include "llvm/IR/GlobalAlias.h" |
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20 #include "llvm/IR/GlobalVariable.h" |
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21 #include "llvm/IR/Module.h" |
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22 #include "llvm/Support/ErrorHandling.h" |
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23 #include "llvm/Support/LeakDetector.h" |
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24 using namespace llvm; |
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25 |
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26 //===----------------------------------------------------------------------===// |
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27 // GlobalValue Class |
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28 //===----------------------------------------------------------------------===// |
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29 |
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30 bool GlobalValue::isMaterializable() const { |
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31 return getParent() && getParent()->isMaterializable(this); |
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32 } |
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33 bool GlobalValue::isDematerializable() const { |
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34 return getParent() && getParent()->isDematerializable(this); |
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35 } |
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36 bool GlobalValue::Materialize(std::string *ErrInfo) { |
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37 return getParent()->Materialize(this, ErrInfo); |
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38 } |
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39 void GlobalValue::Dematerialize() { |
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40 getParent()->Dematerialize(this); |
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41 } |
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42 |
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43 /// Override destroyConstant to make sure it doesn't get called on |
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44 /// GlobalValue's because they shouldn't be treated like other constants. |
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45 void GlobalValue::destroyConstant() { |
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46 llvm_unreachable("You can't GV->destroyConstant()!"); |
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47 } |
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48 |
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49 /// copyAttributesFrom - copy all additional attributes (those not needed to |
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50 /// create a GlobalValue) from the GlobalValue Src to this one. |
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51 void GlobalValue::copyAttributesFrom(const GlobalValue *Src) { |
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52 setAlignment(Src->getAlignment()); |
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53 setSection(Src->getSection()); |
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54 setVisibility(Src->getVisibility()); |
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55 setUnnamedAddr(Src->hasUnnamedAddr()); |
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56 } |
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57 |
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58 void GlobalValue::setAlignment(unsigned Align) { |
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59 assert((Align & (Align-1)) == 0 && "Alignment is not a power of 2!"); |
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60 assert(Align <= MaximumAlignment && |
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61 "Alignment is greater than MaximumAlignment!"); |
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62 Alignment = Log2_32(Align) + 1; |
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63 assert(getAlignment() == Align && "Alignment representation error!"); |
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64 } |
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65 |
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66 bool GlobalValue::isDeclaration() const { |
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67 // Globals are definitions if they have an initializer. |
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68 if (const GlobalVariable *GV = dyn_cast<GlobalVariable>(this)) |
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69 return GV->getNumOperands() == 0; |
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70 |
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71 // Functions are definitions if they have a body. |
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72 if (const Function *F = dyn_cast<Function>(this)) |
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73 return F->empty(); |
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74 |
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75 // Aliases are always definitions. |
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76 assert(isa<GlobalAlias>(this)); |
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77 return false; |
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78 } |
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79 |
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80 //===----------------------------------------------------------------------===// |
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81 // GlobalVariable Implementation |
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82 //===----------------------------------------------------------------------===// |
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83 |
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84 GlobalVariable::GlobalVariable(Type *Ty, bool constant, LinkageTypes Link, |
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85 Constant *InitVal, |
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86 const Twine &Name, ThreadLocalMode TLMode, |
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87 unsigned AddressSpace, |
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88 bool isExternallyInitialized) |
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89 : GlobalValue(PointerType::get(Ty, AddressSpace), |
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90 Value::GlobalVariableVal, |
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91 OperandTraits<GlobalVariable>::op_begin(this), |
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92 InitVal != 0, Link, Name), |
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93 isConstantGlobal(constant), threadLocalMode(TLMode), |
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94 isExternallyInitializedConstant(isExternallyInitialized) { |
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95 if (InitVal) { |
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96 assert(InitVal->getType() == Ty && |
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97 "Initializer should be the same type as the GlobalVariable!"); |
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98 Op<0>() = InitVal; |
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99 } |
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100 |
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101 LeakDetector::addGarbageObject(this); |
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102 } |
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103 |
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104 GlobalVariable::GlobalVariable(Module &M, Type *Ty, bool constant, |
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105 LinkageTypes Link, Constant *InitVal, |
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106 const Twine &Name, |
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107 GlobalVariable *Before, ThreadLocalMode TLMode, |
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108 unsigned AddressSpace, |
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109 bool isExternallyInitialized) |
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110 : GlobalValue(PointerType::get(Ty, AddressSpace), |
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111 Value::GlobalVariableVal, |
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112 OperandTraits<GlobalVariable>::op_begin(this), |
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113 InitVal != 0, Link, Name), |
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114 isConstantGlobal(constant), threadLocalMode(TLMode), |
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115 isExternallyInitializedConstant(isExternallyInitialized) { |
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116 if (InitVal) { |
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117 assert(InitVal->getType() == Ty && |
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118 "Initializer should be the same type as the GlobalVariable!"); |
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119 Op<0>() = InitVal; |
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120 } |
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121 |
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122 LeakDetector::addGarbageObject(this); |
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123 |
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124 if (Before) |
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125 Before->getParent()->getGlobalList().insert(Before, this); |
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126 else |
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127 M.getGlobalList().push_back(this); |
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128 } |
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129 |
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130 void GlobalVariable::setParent(Module *parent) { |
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131 if (getParent()) |
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132 LeakDetector::addGarbageObject(this); |
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133 Parent = parent; |
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134 if (getParent()) |
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135 LeakDetector::removeGarbageObject(this); |
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136 } |
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137 |
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138 void GlobalVariable::removeFromParent() { |
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139 getParent()->getGlobalList().remove(this); |
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140 } |
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141 |
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142 void GlobalVariable::eraseFromParent() { |
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143 getParent()->getGlobalList().erase(this); |
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144 } |
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145 |
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146 void GlobalVariable::replaceUsesOfWithOnConstant(Value *From, Value *To, |
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147 Use *U) { |
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148 // If you call this, then you better know this GVar has a constant |
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149 // initializer worth replacing. Enforce that here. |
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150 assert(getNumOperands() == 1 && |
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151 "Attempt to replace uses of Constants on a GVar with no initializer"); |
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152 |
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153 // And, since you know it has an initializer, the From value better be |
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154 // the initializer :) |
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155 assert(getOperand(0) == From && |
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156 "Attempt to replace wrong constant initializer in GVar"); |
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157 |
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158 // And, you better have a constant for the replacement value |
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159 assert(isa<Constant>(To) && |
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160 "Attempt to replace GVar initializer with non-constant"); |
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161 |
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162 // Okay, preconditions out of the way, replace the constant initializer. |
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163 this->setOperand(0, cast<Constant>(To)); |
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164 } |
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165 |
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166 void GlobalVariable::setInitializer(Constant *InitVal) { |
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167 if (InitVal == 0) { |
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168 if (hasInitializer()) { |
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169 Op<0>().set(0); |
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170 NumOperands = 0; |
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171 } |
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172 } else { |
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173 assert(InitVal->getType() == getType()->getElementType() && |
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174 "Initializer type must match GlobalVariable type"); |
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175 if (!hasInitializer()) |
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176 NumOperands = 1; |
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177 Op<0>().set(InitVal); |
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178 } |
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179 } |
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180 |
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181 /// copyAttributesFrom - copy all additional attributes (those not needed to |
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182 /// create a GlobalVariable) from the GlobalVariable Src to this one. |
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183 void GlobalVariable::copyAttributesFrom(const GlobalValue *Src) { |
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184 assert(isa<GlobalVariable>(Src) && "Expected a GlobalVariable!"); |
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185 GlobalValue::copyAttributesFrom(Src); |
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186 const GlobalVariable *SrcVar = cast<GlobalVariable>(Src); |
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187 setThreadLocal(SrcVar->isThreadLocal()); |
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188 } |
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189 |
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190 |
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191 //===----------------------------------------------------------------------===// |
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192 // GlobalAlias Implementation |
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193 //===----------------------------------------------------------------------===// |
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194 |
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195 GlobalAlias::GlobalAlias(Type *Ty, LinkageTypes Link, |
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196 const Twine &Name, Constant* aliasee, |
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197 Module *ParentModule) |
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198 : GlobalValue(Ty, Value::GlobalAliasVal, &Op<0>(), 1, Link, Name) { |
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199 LeakDetector::addGarbageObject(this); |
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200 |
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201 if (aliasee) |
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202 assert(aliasee->getType() == Ty && "Alias and aliasee types should match!"); |
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203 Op<0>() = aliasee; |
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204 |
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205 if (ParentModule) |
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206 ParentModule->getAliasList().push_back(this); |
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207 } |
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208 |
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209 void GlobalAlias::setParent(Module *parent) { |
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210 if (getParent()) |
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211 LeakDetector::addGarbageObject(this); |
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212 Parent = parent; |
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213 if (getParent()) |
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214 LeakDetector::removeGarbageObject(this); |
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215 } |
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216 |
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217 void GlobalAlias::removeFromParent() { |
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218 getParent()->getAliasList().remove(this); |
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219 } |
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220 |
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221 void GlobalAlias::eraseFromParent() { |
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222 getParent()->getAliasList().erase(this); |
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223 } |
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224 |
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225 void GlobalAlias::setAliasee(Constant *Aliasee) { |
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226 assert((!Aliasee || Aliasee->getType() == getType()) && |
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227 "Alias and aliasee types should match!"); |
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228 |
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229 setOperand(0, Aliasee); |
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230 } |
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231 |
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232 const GlobalValue *GlobalAlias::getAliasedGlobal() const { |
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233 const Constant *C = getAliasee(); |
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234 if (C == 0) return 0; |
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235 |
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236 if (const GlobalValue *GV = dyn_cast<GlobalValue>(C)) |
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237 return GV; |
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238 |
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239 const ConstantExpr *CE = cast<ConstantExpr>(C); |
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240 assert((CE->getOpcode() == Instruction::BitCast || |
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241 CE->getOpcode() == Instruction::GetElementPtr) && |
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242 "Unsupported aliasee"); |
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243 |
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244 return cast<GlobalValue>(CE->getOperand(0)); |
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245 } |
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246 |
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247 const GlobalValue *GlobalAlias::resolveAliasedGlobal(bool stopOnWeak) const { |
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248 SmallPtrSet<const GlobalValue*, 3> Visited; |
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249 |
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250 // Check if we need to stop early. |
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251 if (stopOnWeak && mayBeOverridden()) |
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252 return this; |
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253 |
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254 const GlobalValue *GV = getAliasedGlobal(); |
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255 Visited.insert(GV); |
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256 |
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257 // Iterate over aliasing chain, stopping on weak alias if necessary. |
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258 while (const GlobalAlias *GA = dyn_cast<GlobalAlias>(GV)) { |
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259 if (stopOnWeak && GA->mayBeOverridden()) |
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260 break; |
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261 |
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262 GV = GA->getAliasedGlobal(); |
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263 |
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264 if (!Visited.insert(GV)) |
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265 return 0; |
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266 } |
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267 |
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268 return GV; |
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269 } |