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annotate lib/Transforms/ObjCARC/PtrState.h @ 128:c347d3398279 default tip

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fix
author mir3636
date Wed, 06 Dec 2017 14:37:17 +0900
parents 803732b1fca8
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 //===- PtrState.h - ARC State for a Ptr -------------------------*- 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 declarations for the ARC state associated with a ptr. It
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11 // is only used by the ARC Sequence Dataflow computation. By separating this
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12 // from the actual dataflow, it is easier to consider the mechanics of the ARC
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13 // optimization separate from the actual predicates being used.
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14 //
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15 //===----------------------------------------------------------------------===//
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16
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17 #ifndef LLVM_LIB_TRANSFORMS_OBJCARC_PTRSTATE_H
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18 #define LLVM_LIB_TRANSFORMS_OBJCARC_PTRSTATE_H
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19
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20 #include "llvm/ADT/SmallPtrSet.h"
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21 #include "llvm/Analysis/ObjCARCInstKind.h"
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22 #include "llvm/Support/Compiler.h"
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23
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24 namespace llvm {
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25
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26 class BasicBlock;
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27 class Instruction;
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28 class MDNode;
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29 class raw_ostream;
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30 class Value;
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31
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32 namespace objcarc {
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33
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34 class ARCMDKindCache;
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35 class ProvenanceAnalysis;
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36
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37 /// \enum Sequence
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38 ///
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39 /// \brief A sequence of states that a pointer may go through in which an
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40 /// objc_retain and objc_release are actually needed.
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41 enum Sequence {
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42 S_None,
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43 S_Retain, ///< objc_retain(x).
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44 S_CanRelease, ///< foo(x) -- x could possibly see a ref count decrement.
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45 S_Use, ///< any use of x.
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46 S_Stop, ///< like S_Release, but code motion is stopped.
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47 S_Release, ///< objc_release(x).
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48 S_MovableRelease ///< objc_release(x), !clang.imprecise_release.
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49 };
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50
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51 raw_ostream &operator<<(raw_ostream &OS,
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52 const Sequence S) LLVM_ATTRIBUTE_UNUSED;
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53
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54 /// \brief Unidirectional information about either a
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55 /// retain-decrement-use-release sequence or release-use-decrement-retain
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56 /// reverse sequence.
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57 struct RRInfo {
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58 /// After an objc_retain, the reference count of the referenced
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59 /// object is known to be positive. Similarly, before an objc_release, the
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60 /// reference count of the referenced object is known to be positive. If
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61 /// there are retain-release pairs in code regions where the retain count
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62 /// is known to be positive, they can be eliminated, regardless of any side
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63 /// effects between them.
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64 ///
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65 /// Also, a retain+release pair nested within another retain+release
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66 /// pair all on the known same pointer value can be eliminated, regardless
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67 /// of any intervening side effects.
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68 ///
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69 /// KnownSafe is true when either of these conditions is satisfied.
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70 bool KnownSafe = false;
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71
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72 /// True of the objc_release calls are all marked with the "tail" keyword.
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73 bool IsTailCallRelease = false;
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74
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75 /// If the Calls are objc_release calls and they all have a
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76 /// clang.imprecise_release tag, this is the metadata tag.
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77 MDNode *ReleaseMetadata = nullptr;
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78
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79 /// For a top-down sequence, the set of objc_retains or
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80 /// objc_retainBlocks. For bottom-up, the set of objc_releases.
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81 SmallPtrSet<Instruction *, 2> Calls;
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82
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83 /// The set of optimal insert positions for moving calls in the opposite
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84 /// sequence.
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85 SmallPtrSet<Instruction *, 2> ReverseInsertPts;
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86
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87 /// If this is true, we cannot perform code motion but can still remove
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88 /// retain/release pairs.
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89 bool CFGHazardAfflicted = false;
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90
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91 RRInfo() = default;
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92
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93 void clear();
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94
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95 /// Conservatively merge the two RRInfo. Returns true if a partial merge has
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96 /// occurred, false otherwise.
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97 bool Merge(const RRInfo &Other);
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98 };
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99
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100 /// \brief This class summarizes several per-pointer runtime properties which
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101 /// are propagated through the flow graph.
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102 class PtrState {
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103 protected:
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104 /// True if the reference count is known to be incremented.
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105 bool KnownPositiveRefCount = false;
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106
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107 /// True if we've seen an opportunity for partial RR elimination, such as
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108 /// pushing calls into a CFG triangle or into one side of a CFG diamond.
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109 bool Partial = false;
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110
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111 /// The current position in the sequence.
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112 unsigned char Seq : 8;
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113
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114 /// Unidirectional information about the current sequence.
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115 RRInfo RRI;
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116
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117 PtrState() : Seq(S_None) {}
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118
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119 public:
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120 bool IsKnownSafe() const { return RRI.KnownSafe; }
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121
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122 void SetKnownSafe(const bool NewValue) { RRI.KnownSafe = NewValue; }
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123
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124 bool IsTailCallRelease() const { return RRI.IsTailCallRelease; }
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125
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126 void SetTailCallRelease(const bool NewValue) {
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127 RRI.IsTailCallRelease = NewValue;
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128 }
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129
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130 bool IsTrackingImpreciseReleases() const {
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131 return RRI.ReleaseMetadata != nullptr;
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132 }
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133
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134 const MDNode *GetReleaseMetadata() const { return RRI.ReleaseMetadata; }
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135
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136 void SetReleaseMetadata(MDNode *NewValue) { RRI.ReleaseMetadata = NewValue; }
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137
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138 bool IsCFGHazardAfflicted() const { return RRI.CFGHazardAfflicted; }
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139
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140 void SetCFGHazardAfflicted(const bool NewValue) {
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141 RRI.CFGHazardAfflicted = NewValue;
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142 }
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143
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144 void SetKnownPositiveRefCount();
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145 void ClearKnownPositiveRefCount();
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146
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147 bool HasKnownPositiveRefCount() const { return KnownPositiveRefCount; }
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148
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149 void SetSeq(Sequence NewSeq);
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150
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151 Sequence GetSeq() const { return static_cast<Sequence>(Seq); }
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152
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153 void ClearSequenceProgress() { ResetSequenceProgress(S_None); }
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154
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155 void ResetSequenceProgress(Sequence NewSeq);
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156 void Merge(const PtrState &Other, bool TopDown);
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157
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158 void InsertCall(Instruction *I) { RRI.Calls.insert(I); }
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159
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160 void InsertReverseInsertPt(Instruction *I) { RRI.ReverseInsertPts.insert(I); }
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161
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162 void ClearReverseInsertPts() { RRI.ReverseInsertPts.clear(); }
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163
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164 bool HasReverseInsertPts() const { return !RRI.ReverseInsertPts.empty(); }
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165
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166 const RRInfo &GetRRInfo() const { return RRI; }
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167 };
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168
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169 struct BottomUpPtrState : PtrState {
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170 BottomUpPtrState() = default;
95
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171
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172 /// (Re-)Initialize this bottom up pointer returning true if we detected a
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173 /// pointer with nested releases.
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174 bool InitBottomUp(ARCMDKindCache &Cache, Instruction *I);
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175
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176 /// Return true if this set of releases can be paired with a release. Modifies
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177 /// state appropriately to reflect that the matching occurred if it is
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178 /// successful.
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179 ///
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180 /// It is assumed that one has already checked that the RCIdentity of the
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181 /// retain and the RCIdentity of this ptr state are the same.
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182 bool MatchWithRetain();
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183
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184 void HandlePotentialUse(BasicBlock *BB, Instruction *Inst, const Value *Ptr,
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185 ProvenanceAnalysis &PA, ARCInstKind Class);
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186 bool HandlePotentialAlterRefCount(Instruction *Inst, const Value *Ptr,
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187 ProvenanceAnalysis &PA, ARCInstKind Class);
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188 };
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189
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190 struct TopDownPtrState : PtrState {
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191 TopDownPtrState() = default;
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192
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193 /// (Re-)Initialize this bottom up pointer returning true if we detected a
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194 /// pointer with nested releases.
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195 bool InitTopDown(ARCInstKind Kind, Instruction *I);
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196
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197 /// Return true if this set of retains can be paired with the given
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198 /// release. Modifies state appropriately to reflect that the matching
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199 /// occurred.
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200 bool MatchWithRelease(ARCMDKindCache &Cache, Instruction *Release);
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201
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202 void HandlePotentialUse(Instruction *Inst, const Value *Ptr,
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203 ProvenanceAnalysis &PA, ARCInstKind Class);
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204
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205 bool HandlePotentialAlterRefCount(Instruction *Inst, const Value *Ptr,
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206 ProvenanceAnalysis &PA, ARCInstKind Class);
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207 };
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208
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209 } // end namespace objcarc
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210
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211 } // end namespace llvm
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212
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213 #endif // LLVM_LIB_TRANSFORMS_OBJCARC_PTRSTATE_H