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annotate include/llvm/PassAnalysisSupport.h @ 148:63bd29f05246

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merged
author Shinji KONO <kono@ie.u-ryukyu.ac.jp>
date Wed, 14 Aug 2019 19:46:37 +0900
parents c2174574ed3a
children
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1 //===- llvm/PassAnalysisSupport.h - Analysis Pass Support code --*- C++ -*-===//
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2 //
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3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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4 // See https://llvm.org/LICENSE.txt for license information.
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5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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6 //
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7 //===----------------------------------------------------------------------===//
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8 //
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9 // This file defines stuff that is used to define and "use" Analysis Passes.
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10 // This file is automatically #included by Pass.h, so:
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11 //
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12 // NO .CPP FILES SHOULD INCLUDE THIS FILE DIRECTLY
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13 //
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14 // Instead, #include Pass.h
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15 //
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16 //===----------------------------------------------------------------------===//
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17
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18 #ifndef LLVM_PASSANALYSISSUPPORT_H
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19 #define LLVM_PASSANALYSISSUPPORT_H
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20
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21 #include "Pass.h"
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22 #include "llvm/ADT/SmallVector.h"
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23 #include "llvm/ADT/StringRef.h"
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24 #include <cassert>
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25 #include <utility>
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26 #include <vector>
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27
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28 namespace llvm {
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29
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30 class Function;
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31 class Pass;
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32 class PMDataManager;
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33
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34 //===----------------------------------------------------------------------===//
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35 /// Represent the analysis usage information of a pass. This tracks analyses
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36 /// that the pass REQUIRES (must be available when the pass runs), REQUIRES
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37 /// TRANSITIVE (must be available throughout the lifetime of the pass), and
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38 /// analyses that the pass PRESERVES (the pass does not invalidate the results
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39 /// of these analyses). This information is provided by a pass to the Pass
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40 /// infrastructure through the getAnalysisUsage virtual function.
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41 ///
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42 class AnalysisUsage {
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43 public:
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44 using VectorType = SmallVectorImpl<AnalysisID>;
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45
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46 private:
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47 /// Sets of analyses required and preserved by a pass
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48 // TODO: It's not clear that SmallVector is an appropriate data structure for
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49 // this usecase. The sizes were picked to minimize wasted space, but are
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50 // otherwise fairly meaningless.
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51 SmallVector<AnalysisID, 8> Required;
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52 SmallVector<AnalysisID, 2> RequiredTransitive;
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53 SmallVector<AnalysisID, 2> Preserved;
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54 SmallVector<AnalysisID, 0> Used;
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55 bool PreservesAll = false;
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56
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57 public:
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58 AnalysisUsage() = default;
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59
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60 ///@{
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61 /// Add the specified ID to the required set of the usage info for a pass.
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62 AnalysisUsage &addRequiredID(const void *ID);
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63 AnalysisUsage &addRequiredID(char &ID);
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64 template<class PassClass>
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65 AnalysisUsage &addRequired() {
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66 return addRequiredID(PassClass::ID);
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67 }
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68
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69 AnalysisUsage &addRequiredTransitiveID(char &ID);
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70 template<class PassClass>
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71 AnalysisUsage &addRequiredTransitive() {
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72 return addRequiredTransitiveID(PassClass::ID);
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73 }
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74 ///@}
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75
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76 ///@{
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77 /// Add the specified ID to the set of analyses preserved by this pass.
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78 AnalysisUsage &addPreservedID(const void *ID) {
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79 Preserved.push_back(ID);
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80 return *this;
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81 }
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82 AnalysisUsage &addPreservedID(char &ID) {
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83 Preserved.push_back(&ID);
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84 return *this;
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85 }
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86 /// Add the specified Pass class to the set of analyses preserved by this pass.
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87 template<class PassClass>
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88 AnalysisUsage &addPreserved() {
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89 Preserved.push_back(&PassClass::ID);
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90 return *this;
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91 }
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92 ///@}
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93
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94 ///@{
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95 /// Add the specified ID to the set of analyses used by this pass if they are
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96 /// available..
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97 AnalysisUsage &addUsedIfAvailableID(const void *ID) {
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98 Used.push_back(ID);
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99 return *this;
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100 }
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101 AnalysisUsage &addUsedIfAvailableID(char &ID) {
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102 Used.push_back(&ID);
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103 return *this;
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104 }
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105 /// Add the specified Pass class to the set of analyses used by this pass.
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106 template<class PassClass>
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107 AnalysisUsage &addUsedIfAvailable() {
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108 Used.push_back(&PassClass::ID);
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109 return *this;
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110 }
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111 ///@}
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112
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113 /// Add the Pass with the specified argument string to the set of analyses
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114 /// preserved by this pass. If no such Pass exists, do nothing. This can be
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115 /// useful when a pass is trivially preserved, but may not be linked in. Be
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116 /// careful about spelling!
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117 AnalysisUsage &addPreserved(StringRef Arg);
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118
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119 /// Set by analyses that do not transform their input at all
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120 void setPreservesAll() { PreservesAll = true; }
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121
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122 /// Determine whether a pass said it does not transform its input at all
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123 bool getPreservesAll() const { return PreservesAll; }
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124
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125 /// This function should be called by the pass, iff they do not:
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126 ///
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127 /// 1. Add or remove basic blocks from the function
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128 /// 2. Modify terminator instructions in any way.
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129 ///
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130 /// This function annotates the AnalysisUsage info object to say that analyses
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131 /// that only depend on the CFG are preserved by this pass.
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132 void setPreservesCFG();
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133
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134 const VectorType &getRequiredSet() const { return Required; }
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diff changeset
135 const VectorType &getRequiredTransitiveSet() const {
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diff changeset
136 return RequiredTransitive;
95c75e76d11b LLVM 3.4
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diff changeset
137 }
95c75e76d11b LLVM 3.4
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diff changeset
138 const VectorType &getPreservedSet() const { return Preserved; }
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diff changeset
139 const VectorType &getUsedSet() const { return Used; }
0
95c75e76d11b LLVM 3.4
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diff changeset
140 };
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diff changeset
141
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142 //===----------------------------------------------------------------------===//
95
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diff changeset
143 /// AnalysisResolver - Simple interface used by Pass objects to pull all
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144 /// analysis information out of pass manager that is responsible to manage
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diff changeset
145 /// the pass.
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146 ///
0
95c75e76d11b LLVM 3.4
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diff changeset
147 class AnalysisResolver {
121
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parents: 120
diff changeset
148 public:
83
60c9769439b8 LLVM 3.7
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diff changeset
149 AnalysisResolver() = delete;
121
803732b1fca8 LLVM 5.0
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diff changeset
150 explicit AnalysisResolver(PMDataManager &P) : PM(P) {}
0
95c75e76d11b LLVM 3.4
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151
121
803732b1fca8 LLVM 5.0
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diff changeset
152 PMDataManager &getPMDataManager() { return PM; }
0
95c75e76d11b LLVM 3.4
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153
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diff changeset
154 /// Find pass that is implementing PI.
0
95c75e76d11b LLVM 3.4
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diff changeset
155 Pass *findImplPass(AnalysisID PI) {
77
54457678186b LLVM 3.6
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diff changeset
156 Pass *ResultPass = nullptr;
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diff changeset
157 for (const auto &AnalysisImpl : AnalysisImpls) {
1172e4bd9c6f update 4.0.0
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diff changeset
158 if (AnalysisImpl.first == PI) {
1172e4bd9c6f update 4.0.0
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diff changeset
159 ResultPass = AnalysisImpl.second;
0
95c75e76d11b LLVM 3.4
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parents:
diff changeset
160 break;
95c75e76d11b LLVM 3.4
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parents:
diff changeset
161 }
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parents:
diff changeset
162 }
95c75e76d11b LLVM 3.4
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diff changeset
163 return ResultPass;
95c75e76d11b LLVM 3.4
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164 }
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165
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diff changeset
166 /// Find pass that is implementing PI. Initialize pass for Function F.
0
95c75e76d11b LLVM 3.4
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diff changeset
167 Pass *findImplPass(Pass *P, AnalysisID PI, Function &F);
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168
95c75e76d11b LLVM 3.4
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diff changeset
169 void addAnalysisImplsPair(AnalysisID PI, Pass *P) {
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170 if (findImplPass(PI) == P)
95c75e76d11b LLVM 3.4
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diff changeset
171 return;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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172 std::pair<AnalysisID, Pass*> pir = std::make_pair(PI,P);
95c75e76d11b LLVM 3.4
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parents:
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173 AnalysisImpls.push_back(pir);
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parents:
diff changeset
174 }
95c75e76d11b LLVM 3.4
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parents:
diff changeset
175
134
3a76565eade5 update 5.0.1
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diff changeset
176 /// Clear cache that is used to connect a pass to the analysis (PassInfo).
0
95c75e76d11b LLVM 3.4
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parents:
diff changeset
177 void clearAnalysisImpls() {
95c75e76d11b LLVM 3.4
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diff changeset
178 AnalysisImpls.clear();
95c75e76d11b LLVM 3.4
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179 }
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180
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diff changeset
181 /// Return analysis result or null if it doesn't exist.
0
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
182 Pass *getAnalysisIfAvailable(AnalysisID ID, bool Direction) const;
95c75e76d11b LLVM 3.4
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parents:
diff changeset
183
95c75e76d11b LLVM 3.4
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parents:
diff changeset
184 private:
95
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parents: 83
diff changeset
185 /// This keeps track of which passes implements the interfaces that are
afa8332a0e37 LLVM 3.8
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parents: 83
diff changeset
186 /// required by the current pass (to implement getAnalysis()).
121
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diff changeset
187 std::vector<std::pair<AnalysisID, Pass *>> AnalysisImpls;
0
95c75e76d11b LLVM 3.4
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parents:
diff changeset
188
95
afa8332a0e37 LLVM 3.8
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diff changeset
189 /// PassManager that is used to resolve analysis info
0
95c75e76d11b LLVM 3.4
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parents:
diff changeset
190 PMDataManager &PM;
95c75e76d11b LLVM 3.4
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parents:
diff changeset
191 };
95c75e76d11b LLVM 3.4
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parents:
diff changeset
192
95c75e76d11b LLVM 3.4
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parents:
diff changeset
193 /// getAnalysisIfAvailable<AnalysisType>() - Subclasses use this function to
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
194 /// get analysis information that might be around, for example to update it.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
195 /// This is different than getAnalysis in that it can fail (if the analysis
95c75e76d11b LLVM 3.4
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parents:
diff changeset
196 /// results haven't been computed), so should only be used if you can handle
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
197 /// the case when the analysis is not available. This method is often used by
95c75e76d11b LLVM 3.4
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parents:
diff changeset
198 /// transformation APIs to update analysis results for a pass automatically as
95c75e76d11b LLVM 3.4
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parents:
diff changeset
199 /// the transform is performed.
95c75e76d11b LLVM 3.4
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parents:
diff changeset
200 template<typename AnalysisType>
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
201 AnalysisType *Pass::getAnalysisIfAvailable() const {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
202 assert(Resolver && "Pass not resident in a PassManager object!");
95c75e76d11b LLVM 3.4
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parents:
diff changeset
203
95c75e76d11b LLVM 3.4
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parents:
diff changeset
204 const void *PI = &AnalysisType::ID;
95c75e76d11b LLVM 3.4
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parents:
diff changeset
205
95c75e76d11b LLVM 3.4
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parents:
diff changeset
206 Pass *ResultPass = Resolver->getAnalysisIfAvailable(PI, true);
77
54457678186b LLVM 3.6
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parents: 0
diff changeset
207 if (!ResultPass) return nullptr;
0
95c75e76d11b LLVM 3.4
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parents:
diff changeset
208
95c75e76d11b LLVM 3.4
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parents:
diff changeset
209 // Because the AnalysisType may not be a subclass of pass (for
95c75e76d11b LLVM 3.4
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parents:
diff changeset
210 // AnalysisGroups), we use getAdjustedAnalysisPointer here to potentially
95c75e76d11b LLVM 3.4
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parents:
diff changeset
211 // adjust the return pointer (because the class may multiply inherit, once
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
212 // from pass, once from AnalysisType).
95c75e76d11b LLVM 3.4
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parents:
diff changeset
213 return (AnalysisType*)ResultPass->getAdjustedAnalysisPointer(PI);
95c75e76d11b LLVM 3.4
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parents:
diff changeset
214 }
95c75e76d11b LLVM 3.4
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parents:
diff changeset
215
95c75e76d11b LLVM 3.4
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parents:
diff changeset
216 /// getAnalysis<AnalysisType>() - This function is used by subclasses to get
95c75e76d11b LLVM 3.4
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parents:
diff changeset
217 /// to the analysis information that they claim to use by overriding the
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
218 /// getAnalysisUsage function.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
219 template<typename AnalysisType>
95c75e76d11b LLVM 3.4
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parents:
diff changeset
220 AnalysisType &Pass::getAnalysis() const {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
221 assert(Resolver && "Pass has not been inserted into a PassManager object!");
95c75e76d11b LLVM 3.4
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parents:
diff changeset
222 return getAnalysisID<AnalysisType>(&AnalysisType::ID);
95c75e76d11b LLVM 3.4
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parents:
diff changeset
223 }
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 template<typename AnalysisType>
95c75e76d11b LLVM 3.4
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parents:
diff changeset
226 AnalysisType &Pass::getAnalysisID(AnalysisID PI) const {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
227 assert(PI && "getAnalysis for unregistered pass!");
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
228 assert(Resolver&&"Pass has not been inserted into a PassManager object!");
95c75e76d11b LLVM 3.4
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parents:
diff changeset
229 // PI *must* appear in AnalysisImpls. Because the number of passes used
95c75e76d11b LLVM 3.4
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parents:
diff changeset
230 // should be a small number, we just do a linear search over a (dense)
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
231 // vector.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
232 Pass *ResultPass = Resolver->findImplPass(PI);
147
c2174574ed3a LLVM 10
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 134
diff changeset
233 assert(ResultPass &&
121
803732b1fca8 LLVM 5.0
kono
parents: 120
diff changeset
234 "getAnalysis*() called on an analysis that was not "
803732b1fca8 LLVM 5.0
kono
parents: 120
diff changeset
235 "'required' by pass!");
0
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
236
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
237 // Because the AnalysisType may not be a subclass of pass (for
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
238 // AnalysisGroups), we use getAdjustedAnalysisPointer here to potentially
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
239 // adjust the return pointer (because the class may multiply inherit, once
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
240 // from pass, once from AnalysisType).
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
241 return *(AnalysisType*)ResultPass->getAdjustedAnalysisPointer(PI);
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
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
244 /// getAnalysis<AnalysisType>() - This function is used by subclasses to get
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
245 /// to the analysis information that they claim to use by overriding the
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
246 /// getAnalysisUsage function.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
247 template<typename AnalysisType>
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
248 AnalysisType &Pass::getAnalysis(Function &F) {
95c75e76d11b LLVM 3.4
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parents:
diff changeset
249 assert(Resolver &&"Pass has not been inserted into a PassManager object!");
95c75e76d11b LLVM 3.4
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parents:
diff changeset
250
95c75e76d11b LLVM 3.4
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parents:
diff changeset
251 return getAnalysisID<AnalysisType>(&AnalysisType::ID, F);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
252 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
253
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
254 template<typename AnalysisType>
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
255 AnalysisType &Pass::getAnalysisID(AnalysisID PI, Function &F) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
256 assert(PI && "getAnalysis for unregistered pass!");
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
257 assert(Resolver && "Pass has not been inserted into a PassManager object!");
95c75e76d11b LLVM 3.4
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parents:
diff changeset
258 // PI *must* appear in AnalysisImpls. Because the number of passes used
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
259 // should be a small number, we just do a linear search over a (dense)
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
260 // vector.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
261 Pass *ResultPass = Resolver->findImplPass(this, PI, F);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
262 assert(ResultPass && "Unable to find requested analysis info");
95
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
263
0
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
264 // Because the AnalysisType may not be a subclass of pass (for
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
265 // AnalysisGroups), we use getAdjustedAnalysisPointer here to potentially
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
266 // adjust the return pointer (because the class may multiply inherit, once
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
267 // from pass, once from AnalysisType).
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
268 return *(AnalysisType*)ResultPass->getAdjustedAnalysisPointer(PI);
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269 }
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271 } // end namespace llvm
0
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273 #endif // LLVM_PASSANALYSISSUPPORT_H