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annotate include/llvm/IR/User.h @ 83:60c9769439b8 LLVM3.7

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LLVM 3.7
author Tatsuki IHA <e125716@ie.u-ryukyu.ac.jp>
date Wed, 18 Feb 2015 14:55:36 +0900
parents 54457678186b
children afa8332a0e37
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1 //===-- llvm/User.h - User class definition ---------------------*- 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 class defines the interface that one who uses a Value must implement.
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11 // Each instance of the Value class keeps track of what User's have handles
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12 // to it.
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13 //
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14 // * Instructions are the largest class of Users.
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15 // * Constants may be users of other constants (think arrays and stuff)
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16 //
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17 //===----------------------------------------------------------------------===//
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18
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19 #ifndef LLVM_IR_USER_H
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20 #define LLVM_IR_USER_H
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21
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22 #include "llvm/ADT/iterator.h"
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23 #include "llvm/ADT/iterator_range.h"
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24 #include "llvm/IR/Value.h"
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25 #include "llvm/Support/ErrorHandling.h"
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26
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27 namespace llvm {
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28
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29 /// \brief Compile-time customization of User operands.
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30 ///
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31 /// Customizes operand-related allocators and accessors.
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32 template <class>
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33 struct OperandTraits;
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34
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35 class User : public Value {
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36 User(const User &) = delete;
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37 void *operator new(size_t) = delete;
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38 template <unsigned>
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39 friend struct HungoffOperandTraits;
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40 virtual void anchor();
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41 protected:
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42 /// \brief This is a pointer to the array of Uses for this User.
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43 ///
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44 /// For nodes of fixed arity (e.g. a binary operator) this array will live
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45 /// prefixed to some derived class instance. For nodes of resizable variable
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46 /// arity (e.g. PHINodes, SwitchInst etc.), this memory will be dynamically
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47 /// allocated and should be destroyed by the classes' virtual dtor.
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48 Use *OperandList;
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49
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50 void *operator new(size_t s, unsigned Us);
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51 User(Type *ty, unsigned vty, Use *OpList, unsigned NumOps)
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52 : Value(ty, vty), OperandList(OpList) {
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53 NumOperands = NumOps;
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54 }
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55 Use *allocHungoffUses(unsigned) const;
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56 void dropHungoffUses() {
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57 Use::zap(OperandList, OperandList + NumOperands, true);
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58 OperandList = nullptr;
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59 // Reset NumOperands so User::operator delete() does the right thing.
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60 NumOperands = 0;
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61 }
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62 public:
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63 ~User() {
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64 Use::zap(OperandList, OperandList + NumOperands);
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65 }
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66 /// \brief Free memory allocated for User and Use objects.
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67 void operator delete(void *Usr);
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68 /// \brief Placement delete - required by std, but never called.
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69 void operator delete(void*, unsigned) {
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70 llvm_unreachable("Constructor throws?");
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71 }
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72 /// \brief Placement delete - required by std, but never called.
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73 void operator delete(void*, unsigned, bool) {
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74 llvm_unreachable("Constructor throws?");
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75 }
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76 protected:
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77 template <int Idx, typename U> static Use &OpFrom(const U *that) {
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78 return Idx < 0
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79 ? OperandTraits<U>::op_end(const_cast<U*>(that))[Idx]
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80 : OperandTraits<U>::op_begin(const_cast<U*>(that))[Idx];
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81 }
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82 template <int Idx> Use &Op() {
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83 return OpFrom<Idx>(this);
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84 }
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85 template <int Idx> const Use &Op() const {
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86 return OpFrom<Idx>(this);
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87 }
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88 public:
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89 Value *getOperand(unsigned i) const {
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90 assert(i < NumOperands && "getOperand() out of range!");
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91 return OperandList[i];
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92 }
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93 void setOperand(unsigned i, Value *Val) {
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94 assert(i < NumOperands && "setOperand() out of range!");
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95 assert((!isa<Constant>((const Value*)this) ||
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96 isa<GlobalValue>((const Value*)this)) &&
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97 "Cannot mutate a constant with setOperand!");
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98 OperandList[i] = Val;
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99 }
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100 const Use &getOperandUse(unsigned i) const {
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101 assert(i < NumOperands && "getOperandUse() out of range!");
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102 return OperandList[i];
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103 }
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104 Use &getOperandUse(unsigned i) {
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105 assert(i < NumOperands && "getOperandUse() out of range!");
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106 return OperandList[i];
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107 }
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108
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109 unsigned getNumOperands() const { return NumOperands; }
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110
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111 // ---------------------------------------------------------------------------
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112 // Operand Iterator interface...
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113 //
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114 typedef Use* op_iterator;
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115 typedef const Use* const_op_iterator;
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116 typedef iterator_range<op_iterator> op_range;
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117 typedef iterator_range<const_op_iterator> const_op_range;
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118
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119 inline op_iterator op_begin() { return OperandList; }
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120 inline const_op_iterator op_begin() const { return OperandList; }
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121 inline op_iterator op_end() { return OperandList+NumOperands; }
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122 inline const_op_iterator op_end() const { return OperandList+NumOperands; }
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123 inline op_range operands() {
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124 return op_range(op_begin(), op_end());
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125 }
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126 inline const_op_range operands() const {
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127 return const_op_range(op_begin(), op_end());
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128 }
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129
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130 /// \brief Iterator for directly iterating over the operand Values.
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131 struct value_op_iterator
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132 : iterator_adaptor_base<value_op_iterator, op_iterator,
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133 std::random_access_iterator_tag, Value *,
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134 ptrdiff_t, Value *, Value *> {
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135 explicit value_op_iterator(Use *U = nullptr) : iterator_adaptor_base(U) {}
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136
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137 Value *operator*() const { return *I; }
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138 Value *operator->() const { return operator*(); }
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139 };
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140
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141 inline value_op_iterator value_op_begin() {
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142 return value_op_iterator(op_begin());
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143 }
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144 inline value_op_iterator value_op_end() {
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145 return value_op_iterator(op_end());
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146 }
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147 inline iterator_range<value_op_iterator> operand_values() {
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148 return iterator_range<value_op_iterator>(value_op_begin(), value_op_end());
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149 }
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150
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151 /// \brief Drop all references to operands.
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152 ///
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153 /// This function is in charge of "letting go" of all objects that this User
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154 /// refers to. This allows one to 'delete' a whole class at a time, even
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155 /// though there may be circular references... First all references are
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156 /// dropped, and all use counts go to zero. Then everything is deleted for
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157 /// real. Note that no operations are valid on an object that has "dropped
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158 /// all references", except operator delete.
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159 void dropAllReferences() {
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160 for (Use &U : operands())
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161 U.set(nullptr);
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162 }
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163
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164 /// \brief Replace uses of one Value with another.
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165 ///
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166 /// Replaces all references to the "From" definition with references to the
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167 /// "To" definition.
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168 void replaceUsesOfWith(Value *From, Value *To);
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169
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170 // Methods for support type inquiry through isa, cast, and dyn_cast:
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171 static inline bool classof(const Value *V) {
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172 return isa<Instruction>(V) || isa<Constant>(V);
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173 }
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174 };
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175
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176 template<> struct simplify_type<User::op_iterator> {
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177 typedef Value* SimpleType;
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178 static SimpleType getSimplifiedValue(User::op_iterator &Val) {
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179 return Val->get();
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180 }
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181 };
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182 template<> struct simplify_type<User::const_op_iterator> {
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183 typedef /*const*/ Value* SimpleType;
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184 static SimpleType getSimplifiedValue(User::const_op_iterator &Val) {
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185 return Val->get();
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186 }
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187 };
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188
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189 } // End llvm namespace
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190
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191 #endif