PassSupport.h revision a5370172b64bed5daf8e2869d7bf7cb52f80d6b7
1//===- llvm/PassSupport.h - Pass Support code -------------------*- C++ -*-===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file was developed by the LLVM research group and is distributed under 6// the University of Illinois Open Source License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file defines stuff that is used to define and "use" Passes. This file 11// is automatically #included by Pass.h, so: 12// 13// NO .CPP FILES SHOULD INCLUDE THIS FILE DIRECTLY 14// 15// Instead, #include Pass.h. 16// 17// This file defines Pass registration code and classes used for it. 18// 19//===----------------------------------------------------------------------===// 20 21#ifndef LLVM_PASS_SUPPORT_H 22#define LLVM_PASS_SUPPORT_H 23 24#include "llvm/System/IncludeFile.h" 25// No need to include Pass.h, we are being included by it! 26 27namespace llvm { 28 29class TargetMachine; 30 31//===--------------------------------------------------------------------------- 32/// PassInfo class - An instance of this class exists for every pass known by 33/// the system, and can be obtained from a live Pass by calling its 34/// getPassInfo() method. These objects are set up by the RegisterPass<> 35/// template, defined below. 36/// 37class PassInfo { 38 const char *PassName; // Nice name for Pass 39 const char *PassArgument; // Command Line argument to run this pass 40 const std::type_info &TypeInfo; // type_info object for this Pass class 41 bool IsAnalysisGroup; // True if an analysis group. 42 std::vector<const PassInfo*> ItfImpl;// Interfaces implemented by this pass 43 44 Pass *(*NormalCtor)(); // No argument ctor 45 Pass *(*TargetCtor)(TargetMachine&); // Ctor taking TargetMachine object... 46 47public: 48 /// PassInfo ctor - Do not call this directly, this should only be invoked 49 /// through RegisterPass. 50 PassInfo(const char *name, const char *arg, const std::type_info &ti, 51 Pass *(*normal)() = 0, Pass *(*targetctor)(TargetMachine &) = 0) 52 : PassName(name), PassArgument(arg), TypeInfo(ti), IsAnalysisGroup(false), 53 NormalCtor(normal), TargetCtor(targetctor) { 54 } 55 56 /// getPassName - Return the friendly name for the pass, never returns null 57 /// 58 const char *getPassName() const { return PassName; } 59 void setPassName(const char *Name) { PassName = Name; } 60 61 /// getPassArgument - Return the command line option that may be passed to 62 /// 'opt' that will cause this pass to be run. This will return null if there 63 /// is no argument. 64 /// 65 const char *getPassArgument() const { return PassArgument; } 66 67 /// getTypeInfo - Return the type_info object for the pass... 68 /// 69 const std::type_info &getTypeInfo() const { return TypeInfo; } 70 71 /// isAnalysisGroup - Return true if this is an analysis group, not a normal 72 /// pass. 73 /// 74 bool isAnalysisGroup() const { return IsAnalysisGroup; } 75 void SetIsAnalysisGroup() { IsAnalysisGroup = true; } 76 77 /// getNormalCtor - Return a pointer to a function, that when called, creates 78 /// an instance of the pass and returns it. This pointer may be null if there 79 /// is no default constructor for the pass. 80 /// 81 Pass *(*getNormalCtor() const)() { 82 return NormalCtor; 83 } 84 void setNormalCtor(Pass *(*Ctor)()) { 85 NormalCtor = Ctor; 86 } 87 88 /// createPass() - Use this method to create an instance of this pass. 89 Pass *createPass() const { 90 assert((!isAnalysisGroup() || NormalCtor) && 91 "No default implementation found for analysis group!"); 92 assert(NormalCtor && 93 "Cannot call createPass on PassInfo without default ctor!"); 94 return NormalCtor(); 95 } 96 97 /// getTargetCtor - Return a pointer to a function that creates an instance of 98 /// the pass and returns it. This returns a constructor for a version of the 99 /// pass that takes a TargetMachine object as a parameter. 100 /// 101 Pass *(*getTargetCtor() const)(TargetMachine &) { 102 return TargetCtor; 103 } 104 105 /// addInterfaceImplemented - This method is called when this pass is 106 /// registered as a member of an analysis group with the RegisterAnalysisGroup 107 /// template. 108 /// 109 void addInterfaceImplemented(const PassInfo *ItfPI) { 110 ItfImpl.push_back(ItfPI); 111 } 112 113 /// getInterfacesImplemented - Return a list of all of the analysis group 114 /// interfaces implemented by this pass. 115 /// 116 const std::vector<const PassInfo*> &getInterfacesImplemented() const { 117 return ItfImpl; 118 } 119}; 120 121 122//===--------------------------------------------------------------------------- 123/// RegisterPass<t> template - This template class is used to notify the system 124/// that a Pass is available for use, and registers it into the internal 125/// database maintained by the PassManager. Unless this template is used, opt, 126/// for example will not be able to see the pass and attempts to create the pass 127/// will fail. This template is used in the follow manner (at global scope, in 128/// your .cpp file): 129/// 130/// static RegisterPass<YourPassClassName> tmp("passopt", "My Pass Name"); 131/// 132/// This statement will cause your pass to be created by calling the default 133/// constructor exposed by the pass. If you have a different constructor that 134/// must be called, create a global constructor function (which takes the 135/// arguments you need and returns a Pass*) and register your pass like this: 136/// 137/// Pass *createMyPass(foo &opt) { return new MyPass(opt); } 138/// static RegisterPass<PassClassName> tmp("passopt", "My Name", createMyPass); 139/// 140struct RegisterPassBase { 141 /// getPassInfo - Get the pass info for the registered class... 142 /// 143 const PassInfo *getPassInfo() const { return &PIObj; } 144 145 RegisterPassBase(const char *Name, const char *Arg, const std::type_info &TI, 146 Pass *(*Normal)() = 0, 147 Pass *(*TargetCtor)(TargetMachine &) = 0) 148 : PIObj(Name, Arg, TI, Normal, TargetCtor) { 149 registerPass(); 150 } 151 RegisterPassBase(const std::type_info &TI) 152 : PIObj("", "", TI, 0, 0) { 153 // This ctor may only be used for analysis groups: it does not auto-register 154 // the pass. 155 PIObj.SetIsAnalysisGroup(); 156 } 157 158 ~RegisterPassBase() { // Intentionally non-virtual. 159 // Analysis groups are registered/unregistered by their dtor. 160 if (!PIObj.isAnalysisGroup()) 161 unregisterPass(); 162 } 163 164protected: 165 PassInfo PIObj; // The PassInfo object for this pass 166 void registerPass(); 167 void unregisterPass(); 168 169 /// setOnlyUsesCFG - Notice that this pass only depends on the CFG, so 170 /// transformations that do not modify the CFG do not invalidate this pass. 171 /// 172 void setOnlyUsesCFG(); 173}; 174 175template<typename PassName> 176Pass *callDefaultCtor() { return new PassName(); } 177 178template<typename PassName> 179struct RegisterPass : public RegisterPassBase { 180 181 // Register Pass using default constructor... 182 RegisterPass(const char *PassArg, const char *Name, bool CFGOnly = false) 183 : RegisterPassBase(Name, PassArg, typeid(PassName), 184 callDefaultCtor<PassName>) { 185 if (CFGOnly) setOnlyUsesCFG(); 186 } 187 188 // Register Pass using default constructor explicitly... 189 RegisterPass(const char *PassArg, const char *Name, 190 Pass *(*ctor)(), bool CFGOnly = false) 191 : RegisterPassBase(Name, PassArg, typeid(PassName), ctor) { 192 if (CFGOnly) setOnlyUsesCFG(); 193 } 194 195 // Register Pass using TargetMachine constructor... 196 RegisterPass(const char *PassArg, const char *Name, 197 Pass *(*targetctor)(TargetMachine &), bool CFGOnly = false) 198 : RegisterPassBase(Name, PassArg, typeid(PassName), 0, targetctor) { 199 if (CFGOnly) setOnlyUsesCFG(); 200 } 201 202 // Generic constructor version that has an unknown ctor type... 203 template<typename CtorType> 204 RegisterPass(const char *PassArg, const char *Name, CtorType *Fn, 205 bool CFGOnly = false) 206 : RegisterPassBase(Name, PassArg, typeid(PassName), 0) { 207 if (CFGOnly) setOnlyUsesCFG(); 208 } 209}; 210 211 212/// RegisterAnalysisGroup - Register a Pass as a member of an analysis _group_. 213/// Analysis groups are used to define an interface (which need not derive from 214/// Pass) that is required by passes to do their job. Analysis Groups differ 215/// from normal analyses because any available implementation of the group will 216/// be used if it is available. 217/// 218/// If no analysis implementing the interface is available, a default 219/// implementation is created and added. A pass registers itself as the default 220/// implementation by specifying 'true' as the third template argument of this 221/// class. 222/// 223/// In addition to registering itself as an analysis group member, a pass must 224/// register itself normally as well. Passes may be members of multiple groups 225/// and may still be "required" specifically by name. 226/// 227/// The actual interface may also be registered as well (by not specifying the 228/// second template argument). The interface should be registered to associate 229/// a nice name with the interface. 230/// 231class RegisterAGBase : public RegisterPassBase { 232 PassInfo *InterfaceInfo; 233 const PassInfo *ImplementationInfo; 234 bool isDefaultImplementation; 235protected: 236 RegisterAGBase(const std::type_info &Interface, 237 const std::type_info *Pass = 0, 238 bool isDefault = false); 239 void setGroupName(const char *Name); 240public: 241 ~RegisterAGBase(); 242}; 243 244template<typename Interface, bool Default = false> 245struct RegisterAnalysisGroup : public RegisterAGBase { 246 RegisterAnalysisGroup(RegisterPassBase &RPB) 247 : RegisterAGBase(typeid(Interface), &RPB.getPassInfo()->getTypeInfo(), 248 Default) { 249 } 250 251 RegisterAnalysisGroup(const char *Name) 252 : RegisterAGBase(typeid(Interface)) { 253 setGroupName(Name); 254 } 255}; 256 257 258 259//===--------------------------------------------------------------------------- 260/// PassRegistrationListener class - This class is meant to be derived from by 261/// clients that are interested in which passes get registered and unregistered 262/// at runtime (which can be because of the RegisterPass constructors being run 263/// as the program starts up, or may be because a shared object just got 264/// loaded). Deriving from the PassRegistationListener class automatically 265/// registers your object to receive callbacks indicating when passes are loaded 266/// and removed. 267/// 268struct PassRegistrationListener { 269 270 /// PassRegistrationListener ctor - Add the current object to the list of 271 /// PassRegistrationListeners... 272 PassRegistrationListener(); 273 274 /// dtor - Remove object from list of listeners... 275 /// 276 virtual ~PassRegistrationListener(); 277 278 /// Callback functions - These functions are invoked whenever a pass is loaded 279 /// or removed from the current executable. 280 /// 281 virtual void passRegistered(const PassInfo *P) {} 282 virtual void passUnregistered(const PassInfo *P) {} 283 284 /// enumeratePasses - Iterate over the registered passes, calling the 285 /// passEnumerate callback on each PassInfo object. 286 /// 287 void enumeratePasses(); 288 289 /// passEnumerate - Callback function invoked when someone calls 290 /// enumeratePasses on this PassRegistrationListener object. 291 /// 292 virtual void passEnumerate(const PassInfo *P) {} 293}; 294 295 296} // End llvm namespace 297 298#endif 299