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annotate include/llvm/Analysis/SparsePropagation.h @ 120:1172e4bd9c6f

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update 4.0.0
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1 //===- SparsePropagation.h - Sparse Conditional Property Propagation ------===//
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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 an abstract sparse conditional propagation algorithm,
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11 // modeled after SCCP, but with a customizable lattice function.
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12 //
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13 //===----------------------------------------------------------------------===//
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14
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15 #ifndef LLVM_ANALYSIS_SPARSEPROPAGATION_H
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16 #define LLVM_ANALYSIS_SPARSEPROPAGATION_H
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17
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18 #include "llvm/ADT/DenseMap.h"
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19 #include "llvm/ADT/SmallPtrSet.h"
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20 #include "llvm/IR/BasicBlock.h"
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21 #include <set>
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22 #include <vector>
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23
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24 namespace llvm {
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25 class Value;
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26 class Constant;
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27 class Argument;
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28 class Instruction;
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29 class PHINode;
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30 class TerminatorInst;
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31 class BasicBlock;
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32 class Function;
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33 class SparseSolver;
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34 class raw_ostream;
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35
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36 template <typename T> class SmallVectorImpl;
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37
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38 /// AbstractLatticeFunction - This class is implemented by the dataflow instance
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39 /// to specify what the lattice values are and how they handle merges etc.
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40 /// This gives the client the power to compute lattice values from instructions,
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41 /// constants, etc. The requirement is that lattice values must all fit into
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42 /// a void*. If a void* is not sufficient, the implementation should use this
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43 /// pointer to be a pointer into a uniquing set or something.
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44 ///
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45 class AbstractLatticeFunction {
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46 public:
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47 typedef void *LatticeVal;
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48
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49 private:
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50 LatticeVal UndefVal, OverdefinedVal, UntrackedVal;
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51
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52 public:
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53 AbstractLatticeFunction(LatticeVal undefVal, LatticeVal overdefinedVal,
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54 LatticeVal untrackedVal) {
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55 UndefVal = undefVal;
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56 OverdefinedVal = overdefinedVal;
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57 UntrackedVal = untrackedVal;
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58 }
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59 virtual ~AbstractLatticeFunction();
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60
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61 LatticeVal getUndefVal() const { return UndefVal; }
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62 LatticeVal getOverdefinedVal() const { return OverdefinedVal; }
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63 LatticeVal getUntrackedVal() const { return UntrackedVal; }
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64
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65 /// IsUntrackedValue - If the specified Value is something that is obviously
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66 /// uninteresting to the analysis (and would always return UntrackedVal),
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67 /// this function can return true to avoid pointless work.
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68 virtual bool IsUntrackedValue(Value *V) { return false; }
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69
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70 /// ComputeConstant - Given a constant value, compute and return a lattice
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71 /// value corresponding to the specified constant.
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72 virtual LatticeVal ComputeConstant(Constant *C) {
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73 return getOverdefinedVal(); // always safe
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74 }
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75
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76 /// IsSpecialCasedPHI - Given a PHI node, determine whether this PHI node is
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77 /// one that the we want to handle through ComputeInstructionState.
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78 virtual bool IsSpecialCasedPHI(PHINode *PN) { return false; }
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80 /// GetConstant - If the specified lattice value is representable as an LLVM
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81 /// constant value, return it. Otherwise return null. The returned value
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82 /// must be in the same LLVM type as Val.
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83 virtual Constant *GetConstant(LatticeVal LV, Value *Val, SparseSolver &SS) {
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84 return nullptr;
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85 }
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86
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87 /// ComputeArgument - Given a formal argument value, compute and return a
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88 /// lattice value corresponding to the specified argument.
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89 virtual LatticeVal ComputeArgument(Argument *I) {
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90 return getOverdefinedVal(); // always safe
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91 }
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93 /// MergeValues - Compute and return the merge of the two specified lattice
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94 /// values. Merging should only move one direction down the lattice to
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95 /// guarantee convergence (toward overdefined).
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96 virtual LatticeVal MergeValues(LatticeVal X, LatticeVal Y) {
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97 return getOverdefinedVal(); // always safe, never useful.
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98 }
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99
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100 /// ComputeInstructionState - Given an instruction and a vector of its operand
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101 /// values, compute the result value of the instruction.
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102 virtual LatticeVal ComputeInstructionState(Instruction &I, SparseSolver &SS) {
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103 return getOverdefinedVal(); // always safe, never useful.
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104 }
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106 /// PrintValue - Render the specified lattice value to the specified stream.
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107 virtual void PrintValue(LatticeVal V, raw_ostream &OS);
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108 };
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109
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110 /// SparseSolver - This class is a general purpose solver for Sparse Conditional
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111 /// Propagation with a programmable lattice function.
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112 ///
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113 class SparseSolver {
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114 typedef AbstractLatticeFunction::LatticeVal LatticeVal;
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115
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116 /// LatticeFunc - This is the object that knows the lattice and how to do
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117 /// compute transfer functions.
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118 AbstractLatticeFunction *LatticeFunc;
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119
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120 DenseMap<Value *, LatticeVal> ValueState; // The state each value is in.
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121 SmallPtrSet<BasicBlock *, 16> BBExecutable; // The bbs that are executable.
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122
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123 std::vector<Instruction *> InstWorkList; // Worklist of insts to process.
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124
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125 std::vector<BasicBlock *> BBWorkList; // The BasicBlock work list
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126
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127 /// KnownFeasibleEdges - Entries in this set are edges which have already had
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128 /// PHI nodes retriggered.
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129 typedef std::pair<BasicBlock*,BasicBlock*> Edge;
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130 std::set<Edge> KnownFeasibleEdges;
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131
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132 SparseSolver(const SparseSolver&) = delete;
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133 void operator=(const SparseSolver&) = delete;
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134
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135 public:
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136 explicit SparseSolver(AbstractLatticeFunction *Lattice)
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137 : LatticeFunc(Lattice) {}
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138 ~SparseSolver() { delete LatticeFunc; }
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139
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140 /// Solve - Solve for constants and executable blocks.
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141 ///
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142 void Solve(Function &F);
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143
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144 void Print(Function &F, raw_ostream &OS) const;
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145
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146 /// getLatticeState - Return the LatticeVal object that corresponds to the
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147 /// value. If an value is not in the map, it is returned as untracked,
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148 /// unlike the getOrInitValueState method.
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149 LatticeVal getLatticeState(Value *V) const {
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150 DenseMap<Value*, LatticeVal>::const_iterator I = ValueState.find(V);
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151 return I != ValueState.end() ? I->second : LatticeFunc->getUntrackedVal();
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152 }
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153
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154 /// getOrInitValueState - Return the LatticeVal object that corresponds to the
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155 /// value, initializing the value's state if it hasn't been entered into the
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156 /// map yet. This function is necessary because not all values should start
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157 /// out in the underdefined state... Arguments should be overdefined, and
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158 /// constants should be marked as constants.
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159 ///
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160 LatticeVal getOrInitValueState(Value *V);
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161
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162 /// isEdgeFeasible - Return true if the control flow edge from the 'From'
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163 /// basic block to the 'To' basic block is currently feasible. If
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164 /// AggressiveUndef is true, then this treats values with unknown lattice
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165 /// values as undefined. This is generally only useful when solving the
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166 /// lattice, not when querying it.
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167 bool isEdgeFeasible(BasicBlock *From, BasicBlock *To,
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168 bool AggressiveUndef = false);
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169
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170 /// isBlockExecutable - Return true if there are any known feasible
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171 /// edges into the basic block. This is generally only useful when
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172 /// querying the lattice.
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173 bool isBlockExecutable(BasicBlock *BB) const {
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174 return BBExecutable.count(BB);
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175 }
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176
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177 private:
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178 /// UpdateState - When the state for some instruction is potentially updated,
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179 /// this function notices and adds I to the worklist if needed.
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180 void UpdateState(Instruction &Inst, LatticeVal V);
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181
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182 /// MarkBlockExecutable - This method can be used by clients to mark all of
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183 /// the blocks that are known to be intrinsically live in the processed unit.
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184 void MarkBlockExecutable(BasicBlock *BB);
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185
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186 /// markEdgeExecutable - Mark a basic block as executable, adding it to the BB
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187 /// work list if it is not already executable.
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188 void markEdgeExecutable(BasicBlock *Source, BasicBlock *Dest);
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189
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190 /// getFeasibleSuccessors - Return a vector of booleans to indicate which
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191 /// successors are reachable from a given terminator instruction.
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192 void getFeasibleSuccessors(TerminatorInst &TI, SmallVectorImpl<bool> &Succs,
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193 bool AggressiveUndef);
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194
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195 void visitInst(Instruction &I);
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196 void visitPHINode(PHINode &I);
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197 void visitTerminatorInst(TerminatorInst &TI);
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198 };
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199
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200 } // end namespace llvm
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201
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202 #endif // LLVM_ANALYSIS_SPARSEPROPAGATION_H