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annotate include/llvm/Pass.h @ 116:a609e5c42ecc

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author mir3636
date Mon, 08 Aug 2016 19:47:00 +0900
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children 1172e4bd9c6f
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1 //===- llvm/Pass.h - Base class for Passes ----------------------*- 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 defines a base class that indicates that a specified class is a
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11 // transformation pass implementation.
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12 //
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13 // Passes are designed this way so that it is possible to run passes in a cache
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14 // and organizationally optimal order without having to specify it at the front
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15 // end. This allows arbitrary passes to be strung together and have them
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16 // executed as efficiently as possible.
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17 //
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18 // Passes should extend one of the classes below, depending on the guarantees
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19 // that it can make about what will be modified as it is run. For example, most
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20 // global optimizations should derive from FunctionPass, because they do not add
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21 // or delete functions, they operate on the internals of the function.
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22 //
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23 // Note that this file #includes PassSupport.h and PassAnalysisSupport.h (at the
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24 // bottom), so the APIs exposed by these files are also automatically available
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25 // to all users of this file.
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26 //
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27 //===----------------------------------------------------------------------===//
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28
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29 #ifndef LLVM_PASS_H
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30 #define LLVM_PASS_H
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31
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32 #include "llvm/Support/Compiler.h"
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33 #include <string>
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34
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35 namespace llvm {
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36
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37 class BasicBlock;
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38 class Function;
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39 class Module;
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40 class AnalysisUsage;
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41 class PassInfo;
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42 class ImmutablePass;
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43 class PMStack;
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44 class AnalysisResolver;
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45 class PMDataManager;
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46 class raw_ostream;
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47 class StringRef;
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48
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49 // AnalysisID - Use the PassInfo to identify a pass...
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50 typedef const void* AnalysisID;
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51
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52 /// Different types of internal pass managers. External pass managers
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53 /// (PassManager and FunctionPassManager) are not represented here.
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54 /// Ordering of pass manager types is important here.
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55 enum PassManagerType {
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56 PMT_Unknown = 0,
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57 PMT_ModulePassManager = 1, ///< MPPassManager
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58 PMT_CallGraphPassManager, ///< CGPassManager
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59 PMT_FunctionPassManager, ///< FPPassManager
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60 PMT_LoopPassManager, ///< LPPassManager
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61 PMT_RegionPassManager, ///< RGPassManager
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62 PMT_BasicBlockPassManager, ///< BBPassManager
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63 PMT_Last
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64 };
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65
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66 // Different types of passes.
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67 enum PassKind {
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68 PT_BasicBlock,
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69 PT_Region,
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70 PT_Loop,
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71 PT_Function,
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72 PT_CallGraphSCC,
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73 PT_Module,
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74 PT_PassManager
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75 };
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76
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77 //===----------------------------------------------------------------------===//
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78 /// Pass interface - Implemented by all 'passes'. Subclass this if you are an
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79 /// interprocedural optimization or you do not fit into any of the more
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80 /// constrained passes described below.
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81 ///
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82 class Pass {
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83 AnalysisResolver *Resolver; // Used to resolve analysis
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84 const void *PassID;
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85 PassKind Kind;
83
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86 void operator=(const Pass&) = delete;
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87 Pass(const Pass &) = delete;
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88
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89 public:
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90 explicit Pass(PassKind K, char &pid)
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91 : Resolver(nullptr), PassID(&pid), Kind(K) { }
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92 virtual ~Pass();
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93
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94
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95 PassKind getPassKind() const { return Kind; }
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96
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97 /// getPassName - Return a nice clean name for a pass. This usually
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98 /// implemented in terms of the name that is registered by one of the
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99 /// Registration templates, but can be overloaded directly.
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100 ///
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101 virtual const char *getPassName() const;
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102
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103 /// getPassID - Return the PassID number that corresponds to this pass.
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104 AnalysisID getPassID() const {
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105 return PassID;
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106 }
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107
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108 /// doInitialization - Virtual method overridden by subclasses to do
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109 /// any necessary initialization before any pass is run.
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110 ///
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111 virtual bool doInitialization(Module &) { return false; }
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112
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113 /// doFinalization - Virtual method overriden by subclasses to do any
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114 /// necessary clean up after all passes have run.
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115 ///
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116 virtual bool doFinalization(Module &) { return false; }
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117
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118 /// print - Print out the internal state of the pass. This is called by
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119 /// Analyze to print out the contents of an analysis. Otherwise it is not
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120 /// necessary to implement this method. Beware that the module pointer MAY be
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121 /// null. This automatically forwards to a virtual function that does not
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122 /// provide the Module* in case the analysis doesn't need it it can just be
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123 /// ignored.
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124 ///
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125 virtual void print(raw_ostream &O, const Module *M) const;
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126 void dump() const; // dump - Print to stderr.
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127
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128 /// createPrinterPass - Get a Pass appropriate to print the IR this
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129 /// pass operates on (Module, Function or MachineFunction).
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130 virtual Pass *createPrinterPass(raw_ostream &O,
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131 const std::string &Banner) const = 0;
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132
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133 /// Each pass is responsible for assigning a pass manager to itself.
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134 /// PMS is the stack of available pass manager.
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135 virtual void assignPassManager(PMStack &,
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136 PassManagerType) {}
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137 /// Check if available pass managers are suitable for this pass or not.
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138 virtual void preparePassManager(PMStack &);
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139
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140 /// Return what kind of Pass Manager can manage this pass.
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141 virtual PassManagerType getPotentialPassManagerType() const;
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142
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143 // Access AnalysisResolver
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144 void setResolver(AnalysisResolver *AR);
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145 AnalysisResolver *getResolver() const { return Resolver; }
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146
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147 /// getAnalysisUsage - This function should be overriden by passes that need
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148 /// analysis information to do their job. If a pass specifies that it uses a
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149 /// particular analysis result to this function, it can then use the
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150 /// getAnalysis<AnalysisType>() function, below.
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151 ///
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152 virtual void getAnalysisUsage(AnalysisUsage &) const;
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153
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154 /// releaseMemory() - This member can be implemented by a pass if it wants to
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155 /// be able to release its memory when it is no longer needed. The default
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156 /// behavior of passes is to hold onto memory for the entire duration of their
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157 /// lifetime (which is the entire compile time). For pipelined passes, this
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158 /// is not a big deal because that memory gets recycled every time the pass is
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159 /// invoked on another program unit. For IP passes, it is more important to
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160 /// free memory when it is unused.
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161 ///
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162 /// Optionally implement this function to release pass memory when it is no
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163 /// longer used.
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164 ///
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165 virtual void releaseMemory();
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166
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167 /// getAdjustedAnalysisPointer - This method is used when a pass implements
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168 /// an analysis interface through multiple inheritance. If needed, it should
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169 /// override this to adjust the this pointer as needed for the specified pass
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170 /// info.
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171 virtual void *getAdjustedAnalysisPointer(AnalysisID ID);
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172 virtual ImmutablePass *getAsImmutablePass();
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173 virtual PMDataManager *getAsPMDataManager();
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174
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175 /// verifyAnalysis() - This member can be implemented by a analysis pass to
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176 /// check state of analysis information.
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177 virtual void verifyAnalysis() const;
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178
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179 // dumpPassStructure - Implement the -debug-passes=PassStructure option
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180 virtual void dumpPassStructure(unsigned Offset = 0);
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181
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182 // lookupPassInfo - Return the pass info object for the specified pass class,
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183 // or null if it is not known.
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184 static const PassInfo *lookupPassInfo(const void *TI);
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185
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186 // lookupPassInfo - Return the pass info object for the pass with the given
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187 // argument string, or null if it is not known.
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188 static const PassInfo *lookupPassInfo(StringRef Arg);
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189
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190 // createPass - Create a object for the specified pass class,
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191 // or null if it is not known.
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192 static Pass *createPass(AnalysisID ID);
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193
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194 /// getAnalysisIfAvailable<AnalysisType>() - Subclasses use this function to
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195 /// get analysis information that might be around, for example to update it.
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196 /// This is different than getAnalysis in that it can fail (if the analysis
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197 /// results haven't been computed), so should only be used if you can handle
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198 /// the case when the analysis is not available. This method is often used by
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199 /// transformation APIs to update analysis results for a pass automatically as
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200 /// the transform is performed.
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201 ///
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202 template<typename AnalysisType> AnalysisType *
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203 getAnalysisIfAvailable() const; // Defined in PassAnalysisSupport.h
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204
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205 /// mustPreserveAnalysisID - This method serves the same function as
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206 /// getAnalysisIfAvailable, but works if you just have an AnalysisID. This
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207 /// obviously cannot give you a properly typed instance of the class if you
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208 /// don't have the class name available (use getAnalysisIfAvailable if you
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209 /// do), but it can tell you if you need to preserve the pass at least.
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210 ///
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211 bool mustPreserveAnalysisID(char &AID) const;
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212
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213 /// getAnalysis<AnalysisType>() - This function is used by subclasses to get
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214 /// to the analysis information that they claim to use by overriding the
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215 /// getAnalysisUsage function.
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216 ///
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217 template<typename AnalysisType>
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218 AnalysisType &getAnalysis() const; // Defined in PassAnalysisSupport.h
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219
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220 template<typename AnalysisType>
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221 AnalysisType &getAnalysis(Function &F); // Defined in PassAnalysisSupport.h
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222
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223 template<typename AnalysisType>
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224 AnalysisType &getAnalysisID(AnalysisID PI) const;
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225
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226 template<typename AnalysisType>
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227 AnalysisType &getAnalysisID(AnalysisID PI, Function &F);
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228 };
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229
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230
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231 //===----------------------------------------------------------------------===//
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232 /// ModulePass class - This class is used to implement unstructured
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233 /// interprocedural optimizations and analyses. ModulePasses may do anything
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234 /// they want to the program.
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235 ///
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236 class ModulePass : public Pass {
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237 public:
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238 /// createPrinterPass - Get a module printer pass.
77
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239 Pass *createPrinterPass(raw_ostream &O,
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240 const std::string &Banner) const override;
0
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241
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242 /// runOnModule - Virtual method overriden by subclasses to process the module
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243 /// being operated on.
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244 virtual bool runOnModule(Module &M) = 0;
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245
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246 void assignPassManager(PMStack &PMS, PassManagerType T) override;
0
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247
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248 /// Return what kind of Pass Manager can manage this pass.
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249 PassManagerType getPotentialPassManagerType() const override;
0
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250
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251 explicit ModulePass(char &pid) : Pass(PT_Module, pid) {}
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252 // Force out-of-line virtual method.
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253 ~ModulePass() override;
0
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254 };
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255
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256
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257 //===----------------------------------------------------------------------===//
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258 /// ImmutablePass class - This class is used to provide information that does
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259 /// not need to be run. This is useful for things like target information and
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260 /// "basic" versions of AnalysisGroups.
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261 ///
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262 class ImmutablePass : public ModulePass {
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263 public:
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264 /// initializePass - This method may be overriden by immutable passes to allow
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265 /// them to perform various initialization actions they require. This is
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266 /// primarily because an ImmutablePass can "require" another ImmutablePass,
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267 /// and if it does, the overloaded version of initializePass may get access to
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268 /// these passes with getAnalysis<>.
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269 ///
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270 virtual void initializePass();
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271
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272 ImmutablePass *getAsImmutablePass() override { return this; }
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273
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274 /// ImmutablePasses are never run.
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275 ///
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276 bool runOnModule(Module &) override { return false; }
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277
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278 explicit ImmutablePass(char &pid)
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279 : ModulePass(pid) {}
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280
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281 // Force out-of-line virtual method.
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282 ~ImmutablePass() override;
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283 };
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284
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285 //===----------------------------------------------------------------------===//
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286 /// FunctionPass class - This class is used to implement most global
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287 /// optimizations. Optimizations should subclass this class if they meet the
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288 /// following constraints:
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289 ///
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290 /// 1. Optimizations are organized globally, i.e., a function at a time
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291 /// 2. Optimizing a function does not cause the addition or removal of any
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292 /// functions in the module
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293 ///
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294 class FunctionPass : public Pass {
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295 public:
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296 explicit FunctionPass(char &pid) : Pass(PT_Function, pid) {}
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297
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298 /// createPrinterPass - Get a function printer pass.
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299 Pass *createPrinterPass(raw_ostream &O,
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300 const std::string &Banner) const override;
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301
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302 /// runOnFunction - Virtual method overriden by subclasses to do the
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303 /// per-function processing of the pass.
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304 ///
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305 virtual bool runOnFunction(Function &F) = 0;
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306
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307 void assignPassManager(PMStack &PMS, PassManagerType T) override;
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308
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309 /// Return what kind of Pass Manager can manage this pass.
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310 PassManagerType getPotentialPassManagerType() const override;
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311
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312 protected:
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313 /// skipOptnoneFunction - This function has Attribute::OptimizeNone
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314 /// and most transformation passes should skip it.
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315 bool skipOptnoneFunction(const Function &F) const;
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316 };
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317
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318
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319
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320 //===----------------------------------------------------------------------===//
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321 /// BasicBlockPass class - This class is used to implement most local
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322 /// optimizations. Optimizations should subclass this class if they
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323 /// meet the following constraints:
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324 /// 1. Optimizations are local, operating on either a basic block or
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325 /// instruction at a time.
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326 /// 2. Optimizations do not modify the CFG of the contained function, or any
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327 /// other basic block in the function.
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328 /// 3. Optimizations conform to all of the constraints of FunctionPasses.
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329 ///
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330 class BasicBlockPass : public Pass {
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331 public:
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332 explicit BasicBlockPass(char &pid) : Pass(PT_BasicBlock, pid) {}
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333
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334 /// createPrinterPass - Get a basic block printer pass.
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335 Pass *createPrinterPass(raw_ostream &O,
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336 const std::string &Banner) const override;
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337
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338 using llvm::Pass::doInitialization;
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339 using llvm::Pass::doFinalization;
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340
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341 /// doInitialization - Virtual method overridden by BasicBlockPass subclasses
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342 /// to do any necessary per-function initialization.
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343 ///
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344 virtual bool doInitialization(Function &);
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345
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346 /// runOnBasicBlock - Virtual method overriden by subclasses to do the
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347 /// per-basicblock processing of the pass.
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348 ///
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349 virtual bool runOnBasicBlock(BasicBlock &BB) = 0;
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350
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351 /// doFinalization - Virtual method overriden by BasicBlockPass subclasses to
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352 /// do any post processing needed after all passes have run.
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353 ///
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354 virtual bool doFinalization(Function &);
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355
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356 void assignPassManager(PMStack &PMS, PassManagerType T) override;
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357
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358 /// Return what kind of Pass Manager can manage this pass.
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359 PassManagerType getPotentialPassManagerType() const override;
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360
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361 protected:
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362 /// skipOptnoneFunction - Containing function has Attribute::OptimizeNone
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363 /// and most transformation passes should skip it.
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364 bool skipOptnoneFunction(const BasicBlock &BB) const;
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365 };
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366
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367 /// If the user specifies the -time-passes argument on an LLVM tool command line
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368 /// then the value of this boolean will be true, otherwise false.
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369 /// @brief This is the storage for the -time-passes option.
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370 extern bool TimePassesIsEnabled;
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371
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372 /// isFunctionInPrintList - returns true if a function should be printed via
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373 // debugging options like -print-after-all/-print-before-all.
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374 // @brief Tells if the function IR should be printed by PrinterPass.
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375 extern bool isFunctionInPrintList(StringRef FunctionName);
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376 } // End llvm namespace
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377
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378 // Include support files that contain important APIs commonly used by Passes,
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379 // but that we want to separate out to make it easier to read the header files.
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380 //
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381 #include "llvm/PassSupport.h"
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382 #include "llvm/PassAnalysisSupport.h"
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383
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384 #endif