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annotate include/llvm/IR/BasicBlock.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/BasicBlock.h - Represent a basic block in the VM ---*- 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 file contains the declaration of the BasicBlock class.
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11 //
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12 //===----------------------------------------------------------------------===//
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13
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14 #ifndef LLVM_IR_BASICBLOCK_H
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15 #define LLVM_IR_BASICBLOCK_H
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16
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17 #include "llvm/ADT/Twine.h"
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18 #include "llvm/ADT/ilist.h"
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19 #include "llvm/IR/Instruction.h"
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20 #include "llvm/IR/SymbolTableListTraits.h"
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21 #include "llvm/Support/CBindingWrapping.h"
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22 #include "llvm/Support/DataTypes.h"
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23
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24 namespace llvm {
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25
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26 class CallInst;
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27 class LandingPadInst;
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28 class TerminatorInst;
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29 class LLVMContext;
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30 class BlockAddress;
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31
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32 template<> struct ilist_traits<Instruction>
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33 : public SymbolTableListTraits<Instruction, BasicBlock> {
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34
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35 /// \brief Return a node that marks the end of a list.
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36 ///
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37 /// The sentinel is relative to this instance, so we use a non-static
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38 /// method.
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39 Instruction *createSentinel() const {
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40 // Since i(p)lists always publicly derive from their corresponding traits,
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41 // placing a data member in this class will augment the i(p)list. But since
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42 // the NodeTy is expected to be publicly derive from ilist_node<NodeTy>,
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43 // there is a legal viable downcast from it to NodeTy. We use this trick to
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44 // superimpose an i(p)list with a "ghostly" NodeTy, which becomes the
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45 // sentinel. Dereferencing the sentinel is forbidden (save the
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46 // ilist_node<NodeTy>), so no one will ever notice the superposition.
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47 return static_cast<Instruction*>(&Sentinel);
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48 }
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49 static void destroySentinel(Instruction*) {}
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50
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51 Instruction *provideInitialHead() const { return createSentinel(); }
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52 Instruction *ensureHead(Instruction*) const { return createSentinel(); }
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53 static void noteHead(Instruction*, Instruction*) {}
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54 private:
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55 mutable ilist_half_node<Instruction> Sentinel;
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56 };
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57
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58 /// \brief LLVM Basic Block Representation
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59 ///
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60 /// This represents a single basic block in LLVM. A basic block is simply a
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61 /// container of instructions that execute sequentially. Basic blocks are Values
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62 /// because they are referenced by instructions such as branches and switch
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63 /// tables. The type of a BasicBlock is "Type::LabelTy" because the basic block
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64 /// represents a label to which a branch can jump.
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65 ///
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66 /// A well formed basic block is formed of a list of non-terminating
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67 /// instructions followed by a single TerminatorInst instruction.
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68 /// TerminatorInst's may not occur in the middle of basic blocks, and must
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69 /// terminate the blocks. The BasicBlock class allows malformed basic blocks to
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70 /// occur because it may be useful in the intermediate stage of constructing or
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71 /// modifying a program. However, the verifier will ensure that basic blocks
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72 /// are "well formed".
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73 class BasicBlock : public Value, // Basic blocks are data objects also
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74 public ilist_node<BasicBlock> {
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75 friend class BlockAddress;
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76 public:
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77 typedef iplist<Instruction> InstListType;
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78 private:
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79 InstListType InstList;
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80 Function *Parent;
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81
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82 void setParent(Function *parent);
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83 friend class SymbolTableListTraits<BasicBlock, Function>;
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84
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85 BasicBlock(const BasicBlock &) = delete;
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86 void operator=(const BasicBlock &) = delete;
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87
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88 /// \brief Constructor.
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89 ///
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90 /// If the function parameter is specified, the basic block is automatically
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91 /// inserted at either the end of the function (if InsertBefore is null), or
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92 /// before the specified basic block.
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93 explicit BasicBlock(LLVMContext &C, const Twine &Name = "",
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94 Function *Parent = nullptr,
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95 BasicBlock *InsertBefore = nullptr);
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96 public:
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97 /// \brief Get the context in which this basic block lives.
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98 LLVMContext &getContext() const;
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99
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100 /// Instruction iterators...
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101 typedef InstListType::iterator iterator;
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102 typedef InstListType::const_iterator const_iterator;
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103 typedef InstListType::reverse_iterator reverse_iterator;
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104 typedef InstListType::const_reverse_iterator const_reverse_iterator;
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105
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106 /// \brief Creates a new BasicBlock.
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107 ///
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108 /// If the Parent parameter is specified, the basic block is automatically
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109 /// inserted at either the end of the function (if InsertBefore is 0), or
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110 /// before the specified basic block.
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111 static BasicBlock *Create(LLVMContext &Context, const Twine &Name = "",
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112 Function *Parent = nullptr,
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113 BasicBlock *InsertBefore = nullptr) {
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114 return new BasicBlock(Context, Name, Parent, InsertBefore);
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115 }
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116 ~BasicBlock();
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117
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118 /// \brief Return the enclosing method, or null if none.
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119 const Function *getParent() const { return Parent; }
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120 Function *getParent() { return Parent; }
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121
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122 const DataLayout *getDataLayout() const;
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123
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124 /// \brief Returns the terminator instruction if the block is well formed or
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125 /// null if the block is not well formed.
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126 TerminatorInst *getTerminator();
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127 const TerminatorInst *getTerminator() const;
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128
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129 /// \brief Returns the call instruction marked 'musttail' prior to the
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130 /// terminating return instruction of this basic block, if such a call is
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131 /// present. Otherwise, returns null.
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132 CallInst *getTerminatingMustTailCall();
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133 const CallInst *getTerminatingMustTailCall() const {
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134 return const_cast<BasicBlock *>(this)->getTerminatingMustTailCall();
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135 }
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136
0
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137 /// \brief Returns a pointer to the first instruction in this block that is
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138 /// not a PHINode instruction.
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139 ///
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140 /// When adding instructions to the beginning of the basic block, they should
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141 /// be added before the returned value, not before the first instruction,
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142 /// which might be PHI. Returns 0 is there's no non-PHI instruction.
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143 Instruction* getFirstNonPHI();
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144 const Instruction* getFirstNonPHI() const {
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145 return const_cast<BasicBlock*>(this)->getFirstNonPHI();
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146 }
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147
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148 /// \brief Returns a pointer to the first instruction in this block that is not
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149 /// a PHINode or a debug intrinsic.
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150 Instruction* getFirstNonPHIOrDbg();
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151 const Instruction* getFirstNonPHIOrDbg() const {
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152 return const_cast<BasicBlock*>(this)->getFirstNonPHIOrDbg();
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153 }
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154
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155 /// \brief Returns a pointer to the first instruction in this block that is not
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156 /// a PHINode, a debug intrinsic, or a lifetime intrinsic.
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157 Instruction* getFirstNonPHIOrDbgOrLifetime();
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158 const Instruction* getFirstNonPHIOrDbgOrLifetime() const {
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159 return const_cast<BasicBlock*>(this)->getFirstNonPHIOrDbgOrLifetime();
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160 }
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161
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162 /// \brief Returns an iterator to the first instruction in this block that is
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163 /// suitable for inserting a non-PHI instruction.
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164 ///
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165 /// In particular, it skips all PHIs and LandingPad instructions.
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166 iterator getFirstInsertionPt();
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167 const_iterator getFirstInsertionPt() const {
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168 return const_cast<BasicBlock*>(this)->getFirstInsertionPt();
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169 }
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170
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171 /// \brief Unlink 'this' from the containing function, but do not delete it.
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172 void removeFromParent();
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173
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174 /// \brief Unlink 'this' from the containing function and delete it.
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175 void eraseFromParent();
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176
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177 /// \brief Unlink this basic block from its current function and insert it
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178 /// into the function that \p MovePos lives in, right before \p MovePos.
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179 void moveBefore(BasicBlock *MovePos);
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180
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181 /// \brief Unlink this basic block from its current function and insert it
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182 /// right after \p MovePos in the function \p MovePos lives in.
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183 void moveAfter(BasicBlock *MovePos);
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184
77
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185 /// \brief Insert unlinked basic block into a function.
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186 ///
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187 /// Inserts an unlinked basic block into \c Parent. If \c InsertBefore is
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188 /// provided, inserts before that basic block, otherwise inserts at the end.
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189 ///
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190 /// \pre \a getParent() is \c nullptr.
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191 void insertInto(Function *Parent, BasicBlock *InsertBefore = nullptr);
0
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192
77
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193 /// \brief Return the predecessor of this block if it has a single predecessor
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194 /// block. Otherwise return a null pointer.
0
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195 BasicBlock *getSinglePredecessor();
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196 const BasicBlock *getSinglePredecessor() const {
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197 return const_cast<BasicBlock*>(this)->getSinglePredecessor();
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198 }
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199
77
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200 /// \brief Return the predecessor of this block if it has a unique predecessor
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201 /// block. Otherwise return a null pointer.
0
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202 ///
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203 /// Note that unique predecessor doesn't mean single edge, there can be
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204 /// multiple edges from the unique predecessor to this block (for example a
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205 /// switch statement with multiple cases having the same destination).
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206 BasicBlock *getUniquePredecessor();
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207 const BasicBlock *getUniquePredecessor() const {
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208 return const_cast<BasicBlock*>(this)->getUniquePredecessor();
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209 }
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210
83
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211 /// Return the successor of this block if it has a unique successor.
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212 /// Otherwise return a null pointer. This method is analogous to
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213 /// getUniquePredeccessor above.
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214 BasicBlock *getUniqueSuccessor();
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215 const BasicBlock *getUniqueSuccessor() const {
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216 return const_cast<BasicBlock*>(this)->getUniqueSuccessor();
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217 }
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218
0
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219 //===--------------------------------------------------------------------===//
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220 /// Instruction iterator methods
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221 ///
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222 inline iterator begin() { return InstList.begin(); }
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223 inline const_iterator begin() const { return InstList.begin(); }
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224 inline iterator end () { return InstList.end(); }
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225 inline const_iterator end () const { return InstList.end(); }
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226
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227 inline reverse_iterator rbegin() { return InstList.rbegin(); }
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228 inline const_reverse_iterator rbegin() const { return InstList.rbegin(); }
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229 inline reverse_iterator rend () { return InstList.rend(); }
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230 inline const_reverse_iterator rend () const { return InstList.rend(); }
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231
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232 inline size_t size() const { return InstList.size(); }
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233 inline bool empty() const { return InstList.empty(); }
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234 inline const Instruction &front() const { return InstList.front(); }
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235 inline Instruction &front() { return InstList.front(); }
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236 inline const Instruction &back() const { return InstList.back(); }
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237 inline Instruction &back() { return InstList.back(); }
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diff changeset
238
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239 /// \brief Return the underlying instruction list container.
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240 ///
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241 /// Currently you need to access the underlying instruction list container
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242 /// directly if you want to modify it.
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diff changeset
243 const InstListType &getInstList() const { return InstList; }
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diff changeset
244 InstListType &getInstList() { return InstList; }
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245
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246 /// \brief Returns a pointer to a member of the instruction list.
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247 static iplist<Instruction> BasicBlock::*getSublistAccess(Instruction*) {
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248 return &BasicBlock::InstList;
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249 }
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250
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251 /// \brief Returns a pointer to the symbol table if one exists.
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252 ValueSymbolTable *getValueSymbolTable();
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diff changeset
253
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254 /// \brief Methods for support type inquiry through isa, cast, and dyn_cast.
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255 static inline bool classof(const Value *V) {
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diff changeset
256 return V->getValueID() == Value::BasicBlockVal;
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257 }
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258
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259 /// \brief Cause all subinstructions to "let go" of all the references that
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260 /// said subinstructions are maintaining.
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261 ///
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262 /// This allows one to 'delete' a whole class at a time, even though there may
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263 /// be circular references... first all references are dropped, and all use
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264 /// counts go to zero. Then everything is delete'd for real. Note that no
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265 /// operations are valid on an object that has "dropped all references",
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266 /// except operator delete.
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267 void dropAllReferences();
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268
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269 /// \brief Notify the BasicBlock that the predecessor \p Pred is no longer
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270 /// able to reach it.
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271 ///
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272 /// This is actually not used to update the Predecessor list, but is actually
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273 /// used to update the PHI nodes that reside in the block. Note that this
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274 /// should be called while the predecessor still refers to this block.
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275 void removePredecessor(BasicBlock *Pred, bool DontDeleteUselessPHIs = false);
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276
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277 /// \brief Split the basic block into two basic blocks at the specified
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278 /// instruction.
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279 ///
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280 /// Note that all instructions BEFORE the specified iterator stay as part of
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281 /// the original basic block, an unconditional branch is added to the original
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282 /// BB, and the rest of the instructions in the BB are moved to the new BB,
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283 /// including the old terminator. The newly formed BasicBlock is returned.
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284 /// This function invalidates the specified iterator.
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285 ///
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286 /// Note that this only works on well formed basic blocks (must have a
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287 /// terminator), and 'I' must not be the end of instruction list (which would
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288 /// cause a degenerate basic block to be formed, having a terminator inside of
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289 /// the basic block).
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290 ///
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291 /// Also note that this doesn't preserve any passes. To split blocks while
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292 /// keeping loop information consistent, use the SplitBlock utility function.
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293 BasicBlock *splitBasicBlock(iterator I, const Twine &BBName = "");
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294
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295 /// \brief Returns true if there are any uses of this basic block other than
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296 /// direct branches, switches, etc. to it.
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297 bool hasAddressTaken() const { return getSubclassDataFromValue() != 0; }
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298
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299 /// \brief Update all phi nodes in this basic block's successors to refer to
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300 /// basic block \p New instead of to it.
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301 void replaceSuccessorsPhiUsesWith(BasicBlock *New);
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302
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303 /// \brief Return true if this basic block is a landing pad.
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304 ///
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305 /// Being a ``landing pad'' means that the basic block is the destination of
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306 /// the 'unwind' edge of an invoke instruction.
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307 bool isLandingPad() const;
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308
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309 /// \brief Return the landingpad instruction associated with the landing pad.
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310 LandingPadInst *getLandingPadInst();
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311 const LandingPadInst *getLandingPadInst() const;
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312
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313 private:
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314 /// \brief Increment the internal refcount of the number of BlockAddresses
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315 /// referencing this BasicBlock by \p Amt.
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316 ///
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317 /// This is almost always 0, sometimes one possibly, but almost never 2, and
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318 /// inconceivably 3 or more.
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319 void AdjustBlockAddressRefCount(int Amt) {
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320 setValueSubclassData(getSubclassDataFromValue()+Amt);
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321 assert((int)(signed char)getSubclassDataFromValue() >= 0 &&
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322 "Refcount wrap-around");
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323 }
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324 /// \brief Shadow Value::setValueSubclassData with a private forwarding method
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325 /// so that any future subclasses cannot accidentally use it.
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326 void setValueSubclassData(unsigned short D) {
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327 Value::setValueSubclassData(D);
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328 }
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329 };
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330
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331 // Create wrappers for C Binding types (see CBindingWrapping.h).
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332 DEFINE_SIMPLE_CONVERSION_FUNCTIONS(BasicBlock, LLVMBasicBlockRef)
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333
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334 } // End llvm namespace
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335
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336 #endif