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annotate include/llvm/IR/BasicBlock.h @ 0:95c75e76d11b LLVM3.4

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LLVM 3.4
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Thu, 12 Dec 2013 13:56:28 +0900
parents
children 54457678186b
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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 LandingPadInst;
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27 class TerminatorInst;
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28 class LLVMContext;
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29 class BlockAddress;
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30
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31 template<> struct ilist_traits<Instruction>
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32 : public SymbolTableListTraits<Instruction, BasicBlock> {
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33
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34 /// \brief Return a node that marks the end of a list.
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35 ///
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36 /// The sentinel is relative to this instance, so we use a non-static
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37 /// method.
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38 Instruction *createSentinel() const {
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39 // Since i(p)lists always publicly derive from their corresponding traits,
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40 // placing a data member in this class will augment the i(p)list. But since
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41 // the NodeTy is expected to be publicly derive from ilist_node<NodeTy>,
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42 // there is a legal viable downcast from it to NodeTy. We use this trick to
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43 // superimpose an i(p)list with a "ghostly" NodeTy, which becomes the
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44 // sentinel. Dereferencing the sentinel is forbidden (save the
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45 // ilist_node<NodeTy>), so no one will ever notice the superposition.
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46 return static_cast<Instruction*>(&Sentinel);
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47 }
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48 static void destroySentinel(Instruction*) {}
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49
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50 Instruction *provideInitialHead() const { return createSentinel(); }
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51 Instruction *ensureHead(Instruction*) const { return createSentinel(); }
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52 static void noteHead(Instruction*, Instruction*) {}
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53 private:
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54 mutable ilist_half_node<Instruction> Sentinel;
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55 };
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56
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57 /// \brief LLVM Basic Block Representation
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58 ///
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59 /// This represents a single basic block in LLVM. A basic block is simply a
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60 /// container of instructions that execute sequentially. Basic blocks are Values
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61 /// because they are referenced by instructions such as branches and switch
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62 /// tables. The type of a BasicBlock is "Type::LabelTy" because the basic block
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63 /// represents a label to which a branch can jump.
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64 ///
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65 /// A well formed basic block is formed of a list of non-terminating
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66 /// instructions followed by a single TerminatorInst instruction.
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67 /// TerminatorInst's may not occur in the middle of basic blocks, and must
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68 /// terminate the blocks. The BasicBlock class allows malformed basic blocks to
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69 /// occur because it may be useful in the intermediate stage of constructing or
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70 /// modifying a program. However, the verifier will ensure that basic blocks
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71 /// are "well formed".
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72 class BasicBlock : public Value, // Basic blocks are data objects also
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73 public ilist_node<BasicBlock> {
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74 friend class BlockAddress;
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75 public:
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76 typedef iplist<Instruction> InstListType;
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77 private:
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78 InstListType InstList;
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79 Function *Parent;
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80
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81 void setParent(Function *parent);
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82 friend class SymbolTableListTraits<BasicBlock, Function>;
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83
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84 BasicBlock(const BasicBlock &) LLVM_DELETED_FUNCTION;
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85 void operator=(const BasicBlock &) LLVM_DELETED_FUNCTION;
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86
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87 /// \brief Constructor.
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88 ///
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89 /// If the function parameter is specified, the basic block is automatically
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90 /// inserted at either the end of the function (if InsertBefore is null), or
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91 /// before the specified basic block.
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92 explicit BasicBlock(LLVMContext &C, const Twine &Name = "",
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93 Function *Parent = 0, BasicBlock *InsertBefore = 0);
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94 public:
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95 /// \brief Get the context in which this basic block lives.
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96 LLVMContext &getContext() const;
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97
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98 /// Instruction iterators...
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99 typedef InstListType::iterator iterator;
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100 typedef InstListType::const_iterator const_iterator;
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101 typedef InstListType::reverse_iterator reverse_iterator;
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102 typedef InstListType::const_reverse_iterator const_reverse_iterator;
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103
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104 /// \brief Creates a new BasicBlock.
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105 ///
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106 /// If the Parent parameter is specified, the basic block is automatically
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107 /// inserted at either the end of the function (if InsertBefore is 0), or
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108 /// before the specified basic block.
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109 static BasicBlock *Create(LLVMContext &Context, const Twine &Name = "",
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110 Function *Parent = 0,BasicBlock *InsertBefore = 0) {
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111 return new BasicBlock(Context, Name, Parent, InsertBefore);
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112 }
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113 ~BasicBlock();
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114
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115 /// \brief Return the enclosing method, or null if none.
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116 const Function *getParent() const { return Parent; }
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117 Function *getParent() { return Parent; }
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118
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119 /// \brief Returns the terminator instruction if the block is well formed or
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120 /// null if the block is not well formed.
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121 TerminatorInst *getTerminator();
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122 const TerminatorInst *getTerminator() const;
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123
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124 /// \brief Returns a pointer to the first instruction in this block that is
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125 /// not a PHINode instruction.
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126 ///
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127 /// When adding instructions to the beginning of the basic block, they should
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128 /// be added before the returned value, not before the first instruction,
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129 /// which might be PHI. Returns 0 is there's no non-PHI instruction.
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130 Instruction* getFirstNonPHI();
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diff changeset
131 const Instruction* getFirstNonPHI() const {
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132 return const_cast<BasicBlock*>(this)->getFirstNonPHI();
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133 }
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diff changeset
134
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135 /// \brief Returns a pointer to the first instruction in this block that is not
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diff changeset
136 /// a PHINode or a debug intrinsic.
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diff changeset
137 Instruction* getFirstNonPHIOrDbg();
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diff changeset
138 const Instruction* getFirstNonPHIOrDbg() const {
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diff changeset
139 return const_cast<BasicBlock*>(this)->getFirstNonPHIOrDbg();
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140 }
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parents:
diff changeset
141
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diff changeset
142 /// \brief Returns a pointer to the first instruction in this block that is not
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diff changeset
143 /// a PHINode, a debug intrinsic, or a lifetime intrinsic.
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diff changeset
144 Instruction* getFirstNonPHIOrDbgOrLifetime();
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diff changeset
145 const Instruction* getFirstNonPHIOrDbgOrLifetime() const {
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diff changeset
146 return const_cast<BasicBlock*>(this)->getFirstNonPHIOrDbgOrLifetime();
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147 }
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148
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149 /// \brief Returns an iterator to the first instruction in this block that is
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150 /// suitable for inserting a non-PHI instruction.
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151 ///
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152 /// In particular, it skips all PHIs and LandingPad instructions.
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diff changeset
153 iterator getFirstInsertionPt();
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154 const_iterator getFirstInsertionPt() const {
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155 return const_cast<BasicBlock*>(this)->getFirstInsertionPt();
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156 }
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diff changeset
157
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158 /// \brief Unlink 'this' from the containing function, but do not delete it.
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diff changeset
159 void removeFromParent();
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diff changeset
160
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diff changeset
161 /// \brief Unlink 'this' from the containing function and delete it.
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diff changeset
162 void eraseFromParent();
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diff changeset
163
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diff changeset
164 /// \brief Unlink this basic block from its current function and insert it
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165 /// into the function that \p MovePos lives in, right before \p MovePos.
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diff changeset
166 void moveBefore(BasicBlock *MovePos);
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diff changeset
167
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diff changeset
168 /// \brief Unlink this basic block from its current function and insert it
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169 /// right after \p MovePos in the function \p MovePos lives in.
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diff changeset
170 void moveAfter(BasicBlock *MovePos);
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diff changeset
171
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diff changeset
172
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diff changeset
173 /// \brief Return this block if it has a single predecessor block. Otherwise
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diff changeset
174 /// return a null pointer.
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diff changeset
175 BasicBlock *getSinglePredecessor();
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diff changeset
176 const BasicBlock *getSinglePredecessor() const {
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diff changeset
177 return const_cast<BasicBlock*>(this)->getSinglePredecessor();
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diff changeset
178 }
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diff changeset
179
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diff changeset
180 /// \brief Return this block if it has a unique predecessor block. Otherwise return a null pointer.
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diff changeset
181 ///
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diff changeset
182 /// Note that unique predecessor doesn't mean single edge, there can be
95c75e76d11b LLVM 3.4
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parents:
diff changeset
183 /// multiple edges from the unique predecessor to this block (for example a
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
184 /// switch statement with multiple cases having the same destination).
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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diff changeset
185 BasicBlock *getUniquePredecessor();
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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diff changeset
186 const BasicBlock *getUniquePredecessor() const {
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parents:
diff changeset
187 return const_cast<BasicBlock*>(this)->getUniquePredecessor();
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diff changeset
188 }
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diff changeset
189
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diff changeset
190 //===--------------------------------------------------------------------===//
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diff changeset
191 /// Instruction iterator methods
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diff changeset
192 ///
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diff changeset
193 inline iterator begin() { return InstList.begin(); }
95c75e76d11b LLVM 3.4
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diff changeset
194 inline const_iterator begin() const { return InstList.begin(); }
95c75e76d11b LLVM 3.4
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diff changeset
195 inline iterator end () { return InstList.end(); }
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diff changeset
196 inline const_iterator end () const { return InstList.end(); }
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diff changeset
197
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diff changeset
198 inline reverse_iterator rbegin() { return InstList.rbegin(); }
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diff changeset
199 inline const_reverse_iterator rbegin() const { return InstList.rbegin(); }
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diff changeset
200 inline reverse_iterator rend () { return InstList.rend(); }
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parents:
diff changeset
201 inline const_reverse_iterator rend () const { return InstList.rend(); }
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diff changeset
202
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diff changeset
203 inline size_t size() const { return InstList.size(); }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
204 inline bool empty() const { return InstList.empty(); }
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parents:
diff changeset
205 inline const Instruction &front() const { return InstList.front(); }
95c75e76d11b LLVM 3.4
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parents:
diff changeset
206 inline Instruction &front() { return InstList.front(); }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
207 inline const Instruction &back() const { return InstList.back(); }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
208 inline Instruction &back() { return InstList.back(); }
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diff changeset
209
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diff changeset
210 /// \brief Return the underlying instruction list container.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
211 ///
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
212 /// Currently you need to access the underlying instruction list container
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
213 /// directly if you want to modify it.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
214 const InstListType &getInstList() const { return InstList; }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
215 InstListType &getInstList() { return InstList; }
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parents:
diff changeset
216
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parents:
diff changeset
217 /// \brief Returns a pointer to a member of the instruction list.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
218 static iplist<Instruction> BasicBlock::*getSublistAccess(Instruction*) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
219 return &BasicBlock::InstList;
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
220 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
221
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
222 /// \brief Returns a pointer to the symbol table if one exists.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
223 ValueSymbolTable *getValueSymbolTable();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
224
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
225 /// \brief Methods for support type inquiry through isa, cast, and dyn_cast.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
226 static inline bool classof(const Value *V) {
95c75e76d11b LLVM 3.4
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parents:
diff changeset
227 return V->getValueID() == Value::BasicBlockVal;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
228 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
229
95c75e76d11b LLVM 3.4
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parents:
diff changeset
230 /// \brief Cause all subinstructions to "let go" of all the references that
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
231 /// said subinstructions are maintaining.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
232 ///
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
233 /// This allows one to 'delete' a whole class at a time, even though there may
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
234 /// be circular references... first all references are dropped, and all use
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
235 /// counts go to zero. Then everything is delete'd for real. Note that no
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
236 /// operations are valid on an object that has "dropped all references",
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
237 /// except operator delete.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
238 void dropAllReferences();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
239
95c75e76d11b LLVM 3.4
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parents:
diff changeset
240 /// \brief Notify the BasicBlock that the predecessor \p Pred is no longer
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
241 /// able to reach it.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
242 ///
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
243 /// This is actually not used to update the Predecessor list, but is actually
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
244 /// used to update the PHI nodes that reside in the block. Note that this
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
245 /// should be called while the predecessor still refers to this block.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
246 void removePredecessor(BasicBlock *Pred, bool DontDeleteUselessPHIs = false);
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
247
95c75e76d11b LLVM 3.4
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parents:
diff changeset
248 /// \brief Split the basic block into two basic blocks at the specified
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
249 /// instruction.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
250 ///
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
251 /// Note that all instructions BEFORE the specified iterator stay as part of
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
252 /// the original basic block, an unconditional branch is added to the original
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
253 /// BB, and the rest of the instructions in the BB are moved to the new BB,
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
254 /// including the old terminator. The newly formed BasicBlock is returned.
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
255 /// This function invalidates the specified iterator.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
256 ///
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
257 /// Note that this only works on well formed basic blocks (must have a
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
258 /// terminator), and 'I' must not be the end of instruction list (which would
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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259 /// cause a degenerate basic block to be formed, having a terminator inside of
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260 /// the basic block).
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261 ///
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262 /// Also note that this doesn't preserve any passes. To split blocks while
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263 /// keeping loop information consistent, use the SplitBlock utility function.
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264 BasicBlock *splitBasicBlock(iterator I, const Twine &BBName = "");
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265
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266 /// \brief Returns true if there are any uses of this basic block other than
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267 /// direct branches, switches, etc. to it.
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268 bool hasAddressTaken() const { return getSubclassDataFromValue() != 0; }
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269
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270 /// \brief Update all phi nodes in this basic block's successors to refer to
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271 /// basic block \p New instead of to it.
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272 void replaceSuccessorsPhiUsesWith(BasicBlock *New);
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273
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274 /// \brief Return true if this basic block is a landing pad.
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275 ///
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276 /// Being a ``landing pad'' means that the basic block is the destination of
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277 /// the 'unwind' edge of an invoke instruction.
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278 bool isLandingPad() const;
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279
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280 /// \brief Return the landingpad instruction associated with the landing pad.
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281 LandingPadInst *getLandingPadInst();
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282 const LandingPadInst *getLandingPadInst() const;
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283
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284 private:
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285 /// \brief Increment the internal refcount of the number of BlockAddresses
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286 /// referencing this BasicBlock by \p Amt.
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287 ///
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288 /// This is almost always 0, sometimes one possibly, but almost never 2, and
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289 /// inconceivably 3 or more.
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290 void AdjustBlockAddressRefCount(int Amt) {
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291 setValueSubclassData(getSubclassDataFromValue()+Amt);
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292 assert((int)(signed char)getSubclassDataFromValue() >= 0 &&
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293 "Refcount wrap-around");
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294 }
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295 /// \brief Shadow Value::setValueSubclassData with a private forwarding method
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296 /// so that any future subclasses cannot accidentally use it.
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297 void setValueSubclassData(unsigned short D) {
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298 Value::setValueSubclassData(D);
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299 }
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300 };
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301
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302 // Create wrappers for C Binding types (see CBindingWrapping.h).
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303 DEFINE_SIMPLE_CONVERSION_FUNCTIONS(BasicBlock, LLVMBasicBlockRef)
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304
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305 } // End llvm namespace
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306
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307 #endif