PassSupport.h revision ce665bd2e2b581ab0858d1afe359192bac96b868
1//===- llvm/PassSupport.h - Pass Support code -------------------*- C++ -*-===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// 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 "Pass.h" 25#include "llvm/PassRegistry.h" 26#include "llvm/InitializePasses.h" 27#include <vector> 28 29namespace llvm { 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 { 38public: 39 typedef Pass* (*NormalCtor_t)(); 40 41private: 42 const char *const PassName; // Nice name for Pass 43 const char *const PassArgument; // Command Line argument to run this pass 44 const void *PassID; 45 const bool IsCFGOnlyPass; // Pass only looks at the CFG. 46 const bool IsAnalysis; // True if an analysis pass. 47 const bool IsAnalysisGroup; // True if an analysis group. 48 std::vector<const PassInfo*> ItfImpl;// Interfaces implemented by this pass 49 50 NormalCtor_t NormalCtor; 51 52public: 53 /// PassInfo ctor - Do not call this directly, this should only be invoked 54 /// through RegisterPass. 55 PassInfo(const char *name, const char *arg, const void *pi, 56 NormalCtor_t normal, bool isCFGOnly, bool is_analysis) 57 : PassName(name), PassArgument(arg), PassID(pi), 58 IsCFGOnlyPass(isCFGOnly), 59 IsAnalysis(is_analysis), IsAnalysisGroup(false), NormalCtor(normal) { } 60 /// PassInfo ctor - Do not call this directly, this should only be invoked 61 /// through RegisterPass. This version is for use by analysis groups; it 62 /// does not auto-register the pass. 63 PassInfo(const char *name, const void *pi) 64 : PassName(name), PassArgument(""), PassID(pi), 65 IsCFGOnlyPass(false), 66 IsAnalysis(false), IsAnalysisGroup(true), NormalCtor(0) { } 67 68 /// getPassName - Return the friendly name for the pass, never returns null 69 /// 70 const char *getPassName() const { return PassName; } 71 72 /// getPassArgument - Return the command line option that may be passed to 73 /// 'opt' that will cause this pass to be run. This will return null if there 74 /// is no argument. 75 /// 76 const char *getPassArgument() const { return PassArgument; } 77 78 /// getTypeInfo - Return the id object for the pass... 79 /// TODO : Rename 80 const void *getTypeInfo() const { return PassID; } 81 82 /// Return true if this PassID implements the specified ID pointer. 83 bool isPassID(const void *IDPtr) const { 84 return PassID == IDPtr; 85 } 86 87 /// isAnalysisGroup - Return true if this is an analysis group, not a normal 88 /// pass. 89 /// 90 bool isAnalysisGroup() const { return IsAnalysisGroup; } 91 bool isAnalysis() const { return IsAnalysis; } 92 93 /// isCFGOnlyPass - return true if this pass only looks at the CFG for the 94 /// function. 95 bool isCFGOnlyPass() const { return IsCFGOnlyPass; } 96 97 /// getNormalCtor - Return a pointer to a function, that when called, creates 98 /// an instance of the pass and returns it. This pointer may be null if there 99 /// is no default constructor for the pass. 100 /// 101 NormalCtor_t getNormalCtor() const { 102 return NormalCtor; 103 } 104 void setNormalCtor(NormalCtor_t Ctor) { 105 NormalCtor = Ctor; 106 } 107 108 /// createPass() - Use this method to create an instance of this pass. 109 Pass *createPass() const; 110 111 /// addInterfaceImplemented - This method is called when this pass is 112 /// registered as a member of an analysis group with the RegisterAnalysisGroup 113 /// template. 114 /// 115 void addInterfaceImplemented(const PassInfo *ItfPI) { 116 ItfImpl.push_back(ItfPI); 117 } 118 119 /// getInterfacesImplemented - Return a list of all of the analysis group 120 /// interfaces implemented by this pass. 121 /// 122 const std::vector<const PassInfo*> &getInterfacesImplemented() const { 123 return ItfImpl; 124 } 125 126private: 127 void operator=(const PassInfo &); // do not implement 128 PassInfo(const PassInfo &); // do not implement 129}; 130 131#define INITIALIZE_PASS(passName, arg, name, cfg, analysis) \ 132 void llvm::initialize##passName##Pass(PassRegistry &Registry) { \ 133 PassInfo *PI = new PassInfo(name, arg, & passName ::ID, \ 134 PassInfo::NormalCtor_t(callDefaultCtor< passName >), cfg, analysis); \ 135 Registry.registerPass(*PI); \ 136 } \ 137 static RegisterPass<passName> passName ## _info(arg, name, cfg, analysis); 138 139 140template<typename PassName> 141Pass *callDefaultCtor() { return new PassName(); } 142 143//===--------------------------------------------------------------------------- 144/// RegisterPass<t> template - This template class is used to notify the system 145/// that a Pass is available for use, and registers it into the internal 146/// database maintained by the PassManager. Unless this template is used, opt, 147/// for example will not be able to see the pass and attempts to create the pass 148/// will fail. This template is used in the follow manner (at global scope, in 149/// your .cpp file): 150/// 151/// static RegisterPass<YourPassClassName> tmp("passopt", "My Pass Name"); 152/// 153/// This statement will cause your pass to be created by calling the default 154/// constructor exposed by the pass. If you have a different constructor that 155/// must be called, create a global constructor function (which takes the 156/// arguments you need and returns a Pass*) and register your pass like this: 157/// 158/// static RegisterPass<PassClassName> tmp("passopt", "My Name"); 159/// 160template<typename passName> 161struct RegisterPass : public PassInfo { 162 163 // Register Pass using default constructor... 164 RegisterPass(const char *PassArg, const char *Name, bool CFGOnly = false, 165 bool is_analysis = false) 166 : PassInfo(Name, PassArg, &passName::ID, 167 PassInfo::NormalCtor_t(callDefaultCtor<passName>), 168 CFGOnly, is_analysis) { 169 PassRegistry::getPassRegistry()->registerPass(*this); 170 } 171}; 172 173 174/// RegisterAnalysisGroup - Register a Pass as a member of an analysis _group_. 175/// Analysis groups are used to define an interface (which need not derive from 176/// Pass) that is required by passes to do their job. Analysis Groups differ 177/// from normal analyses because any available implementation of the group will 178/// be used if it is available. 179/// 180/// If no analysis implementing the interface is available, a default 181/// implementation is created and added. A pass registers itself as the default 182/// implementation by specifying 'true' as the second template argument of this 183/// class. 184/// 185/// In addition to registering itself as an analysis group member, a pass must 186/// register itself normally as well. Passes may be members of multiple groups 187/// and may still be "required" specifically by name. 188/// 189/// The actual interface may also be registered as well (by not specifying the 190/// second template argument). The interface should be registered to associate 191/// a nice name with the interface. 192/// 193class RegisterAGBase : public PassInfo { 194public: 195 RegisterAGBase(const char *Name, 196 const void *InterfaceID, 197 const void *PassID = 0, 198 bool isDefault = false); 199}; 200 201template<typename Interface, bool Default = false> 202struct RegisterAnalysisGroup : public RegisterAGBase { 203 explicit RegisterAnalysisGroup(PassInfo &RPB) 204 : RegisterAGBase(RPB.getPassName(), 205 &Interface::ID, RPB.getTypeInfo(), 206 Default) { 207 } 208 209 explicit RegisterAnalysisGroup(const char *Name) 210 : RegisterAGBase(Name, &Interface::ID) { 211 } 212}; 213 214#define INITIALIZE_ANALYSIS_GROUP(agName, name) \ 215 void llvm::initialize##agName##AnalysisGroup(PassRegistry &Registry) { \ 216 PassInfo *AI = new PassInfo(name, & agName :: ID); \ 217 Registry.registerAnalysisGroup(& agName ::ID, 0, *AI, false); \ 218 } \ 219 static RegisterAnalysisGroup<agName> agName##_info (name); 220 221#define INITIALIZE_AG_PASS(passName, agName, arg, name, cfg, analysis, def) \ 222 void llvm::initialize##passName##Pass(PassRegistry &Registry) { \ 223 PassInfo *PI = new PassInfo(name, arg, & passName ::ID, \ 224 PassInfo::NormalCtor_t(callDefaultCtor< passName >), cfg, analysis); \ 225 Registry.registerPass(*PI); \ 226 \ 227 PassInfo *AI = new PassInfo(name, & agName :: ID); \ 228 Registry.registerAnalysisGroup(& agName ::ID, & passName ::ID, *AI, def); \ 229 } \ 230 static RegisterPass<passName> passName ## _info(arg, name, cfg, analysis); \ 231 static RegisterAnalysisGroup<agName, def> passName ## _ag(passName ## _info); 232 233//===--------------------------------------------------------------------------- 234/// PassRegistrationListener class - This class is meant to be derived from by 235/// clients that are interested in which passes get registered and unregistered 236/// at runtime (which can be because of the RegisterPass constructors being run 237/// as the program starts up, or may be because a shared object just got 238/// loaded). Deriving from the PassRegistationListener class automatically 239/// registers your object to receive callbacks indicating when passes are loaded 240/// and removed. 241/// 242struct PassRegistrationListener { 243 244 /// PassRegistrationListener ctor - Add the current object to the list of 245 /// PassRegistrationListeners... 246 PassRegistrationListener(); 247 248 /// dtor - Remove object from list of listeners... 249 /// 250 virtual ~PassRegistrationListener(); 251 252 /// Callback functions - These functions are invoked whenever a pass is loaded 253 /// or removed from the current executable. 254 /// 255 virtual void passRegistered(const PassInfo *) {} 256 257 /// enumeratePasses - Iterate over the registered passes, calling the 258 /// passEnumerate callback on each PassInfo object. 259 /// 260 void enumeratePasses(); 261 262 /// passEnumerate - Callback function invoked when someone calls 263 /// enumeratePasses on this PassRegistrationListener object. 264 /// 265 virtual void passEnumerate(const PassInfo *) {} 266}; 267 268 269} // End llvm namespace 270 271#endif 272