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annotate lib/IR/Globals.cpp @ 20:a5b470e0d09d

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set FastCC(Calling Convention) when the function is code segment and set GuaranteedTailCallOpt. but llvm still output not jmp but call...
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Sun, 06 Oct 2013 18:16:15 +0900
parents 9ad51c7bc036
children
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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 }