PassSupport.h revision dce4a407a24b04eebc6a376f8e62b41aaa7b071f
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_PASSSUPPORT_H 22#define LLVM_PASSSUPPORT_H 23 24#include "Pass.h" 25#include "llvm/InitializePasses.h" 26#include "llvm/PassRegistry.h" 27#include "llvm/Support/Atomic.h" 28#include "llvm/Support/Valgrind.h" 29#include <vector> 30 31namespace llvm { 32 33class TargetMachine; 34//===--------------------------------------------------------------------------- 35/// PassInfo class - An instance of this class exists for every pass known by 36/// the system, and can be obtained from a live Pass by calling its 37/// getPassInfo() method. These objects are set up by the RegisterPass<> 38/// template, defined below. 39/// 40class PassInfo { 41public: 42 typedef Pass* (*NormalCtor_t)(); 43 typedef Pass *(*TargetMachineCtor_t)(TargetMachine *); 44 45private: 46 const char *const PassName; // Nice name for Pass 47 const char *const PassArgument; // Command Line argument to run this pass 48 const void *PassID; 49 const bool IsCFGOnlyPass; // Pass only looks at the CFG. 50 const bool IsAnalysis; // True if an analysis pass. 51 const bool IsAnalysisGroup; // True if an analysis group. 52 std::vector<const PassInfo*> ItfImpl;// Interfaces implemented by this pass 53 54 NormalCtor_t NormalCtor; 55 TargetMachineCtor_t TargetMachineCtor; 56 57public: 58 /// PassInfo ctor - Do not call this directly, this should only be invoked 59 /// through RegisterPass. 60 PassInfo(const char *name, const char *arg, const void *pi, 61 NormalCtor_t normal, bool isCFGOnly, bool is_analysis, 62 TargetMachineCtor_t machine = nullptr) 63 : PassName(name), PassArgument(arg), PassID(pi), 64 IsCFGOnlyPass(isCFGOnly), 65 IsAnalysis(is_analysis), IsAnalysisGroup(false), NormalCtor(normal), 66 TargetMachineCtor(machine) {} 67 /// PassInfo ctor - Do not call this directly, this should only be invoked 68 /// through RegisterPass. This version is for use by analysis groups; it 69 /// does not auto-register the pass. 70 PassInfo(const char *name, const void *pi) 71 : PassName(name), PassArgument(""), PassID(pi), 72 IsCFGOnlyPass(false), 73 IsAnalysis(false), IsAnalysisGroup(true), NormalCtor(nullptr), 74 TargetMachineCtor(nullptr) {} 75 76 /// getPassName - Return the friendly name for the pass, never returns null 77 /// 78 const char *getPassName() const { return PassName; } 79 80 /// getPassArgument - Return the command line option that may be passed to 81 /// 'opt' that will cause this pass to be run. This will return null if there 82 /// is no argument. 83 /// 84 const char *getPassArgument() const { return PassArgument; } 85 86 /// getTypeInfo - Return the id object for the pass... 87 /// TODO : Rename 88 const void *getTypeInfo() const { return PassID; } 89 90 /// Return true if this PassID implements the specified ID pointer. 91 bool isPassID(const void *IDPtr) const { 92 return PassID == IDPtr; 93 } 94 95 /// isAnalysisGroup - Return true if this is an analysis group, not a normal 96 /// pass. 97 /// 98 bool isAnalysisGroup() const { return IsAnalysisGroup; } 99 bool isAnalysis() const { return IsAnalysis; } 100 101 /// isCFGOnlyPass - return true if this pass only looks at the CFG for the 102 /// function. 103 bool isCFGOnlyPass() const { return IsCFGOnlyPass; } 104 105 /// getNormalCtor - Return a pointer to a function, that when called, creates 106 /// an instance of the pass and returns it. This pointer may be null if there 107 /// is no default constructor for the pass. 108 /// 109 NormalCtor_t getNormalCtor() const { 110 return NormalCtor; 111 } 112 void setNormalCtor(NormalCtor_t Ctor) { 113 NormalCtor = Ctor; 114 } 115 116 /// getTargetMachineCtor - Return a pointer to a function, that when called 117 /// with a TargetMachine, creates an instance of the pass and returns it. 118 /// This pointer may be null if there is no constructor with a TargetMachine 119 /// for the pass. 120 /// 121 TargetMachineCtor_t getTargetMachineCtor() const { return TargetMachineCtor; } 122 void setTargetMachineCtor(TargetMachineCtor_t Ctor) { 123 TargetMachineCtor = Ctor; 124 } 125 126 /// createPass() - Use this method to create an instance of this pass. 127 Pass *createPass() const; 128 129 /// addInterfaceImplemented - This method is called when this pass is 130 /// registered as a member of an analysis group with the RegisterAnalysisGroup 131 /// template. 132 /// 133 void addInterfaceImplemented(const PassInfo *ItfPI) { 134 ItfImpl.push_back(ItfPI); 135 } 136 137 /// getInterfacesImplemented - Return a list of all of the analysis group 138 /// interfaces implemented by this pass. 139 /// 140 const std::vector<const PassInfo*> &getInterfacesImplemented() const { 141 return ItfImpl; 142 } 143 144private: 145 void operator=(const PassInfo &) LLVM_DELETED_FUNCTION; 146 PassInfo(const PassInfo &) LLVM_DELETED_FUNCTION; 147}; 148 149#define CALL_ONCE_INITIALIZATION(function) \ 150 static volatile sys::cas_flag initialized = 0; \ 151 sys::cas_flag old_val = sys::CompareAndSwap(&initialized, 1, 0); \ 152 if (old_val == 0) { \ 153 function(Registry); \ 154 sys::MemoryFence(); \ 155 TsanIgnoreWritesBegin(); \ 156 TsanHappensBefore(&initialized); \ 157 initialized = 2; \ 158 TsanIgnoreWritesEnd(); \ 159 } else { \ 160 sys::cas_flag tmp = initialized; \ 161 sys::MemoryFence(); \ 162 while (tmp != 2) { \ 163 tmp = initialized; \ 164 sys::MemoryFence(); \ 165 } \ 166 } \ 167 TsanHappensAfter(&initialized); 168 169#define INITIALIZE_PASS(passName, arg, name, cfg, analysis) \ 170 static void* initialize##passName##PassOnce(PassRegistry &Registry) { \ 171 PassInfo *PI = new PassInfo(name, arg, & passName ::ID, \ 172 PassInfo::NormalCtor_t(callDefaultCtor< passName >), cfg, analysis); \ 173 Registry.registerPass(*PI, true); \ 174 return PI; \ 175 } \ 176 void llvm::initialize##passName##Pass(PassRegistry &Registry) { \ 177 CALL_ONCE_INITIALIZATION(initialize##passName##PassOnce) \ 178 } 179 180#define INITIALIZE_PASS_BEGIN(passName, arg, name, cfg, analysis) \ 181 static void* initialize##passName##PassOnce(PassRegistry &Registry) { 182 183#define INITIALIZE_PASS_DEPENDENCY(depName) \ 184 initialize##depName##Pass(Registry); 185#define INITIALIZE_AG_DEPENDENCY(depName) \ 186 initialize##depName##AnalysisGroup(Registry); 187 188#define INITIALIZE_PASS_END(passName, arg, name, cfg, analysis) \ 189 PassInfo *PI = new PassInfo(name, arg, & passName ::ID, \ 190 PassInfo::NormalCtor_t(callDefaultCtor< passName >), cfg, analysis); \ 191 Registry.registerPass(*PI, true); \ 192 return PI; \ 193 } \ 194 void llvm::initialize##passName##Pass(PassRegistry &Registry) { \ 195 CALL_ONCE_INITIALIZATION(initialize##passName##PassOnce) \ 196 } 197 198template<typename PassName> 199Pass *callDefaultCtor() { return new PassName(); } 200 201template <typename PassName> Pass *callTargetMachineCtor(TargetMachine *TM) { 202 return new PassName(TM); 203} 204 205//===--------------------------------------------------------------------------- 206/// RegisterPass<t> template - This template class is used to notify the system 207/// that a Pass is available for use, and registers it into the internal 208/// database maintained by the PassManager. Unless this template is used, opt, 209/// for example will not be able to see the pass and attempts to create the pass 210/// will fail. This template is used in the follow manner (at global scope, in 211/// your .cpp file): 212/// 213/// static RegisterPass<YourPassClassName> tmp("passopt", "My Pass Name"); 214/// 215/// This statement will cause your pass to be created by calling the default 216/// constructor exposed by the pass. If you have a different constructor that 217/// must be called, create a global constructor function (which takes the 218/// arguments you need and returns a Pass*) and register your pass like this: 219/// 220/// static RegisterPass<PassClassName> tmp("passopt", "My Name"); 221/// 222template<typename passName> 223struct RegisterPass : public PassInfo { 224 225 // Register Pass using default constructor... 226 RegisterPass(const char *PassArg, const char *Name, bool CFGOnly = false, 227 bool is_analysis = false) 228 : PassInfo(Name, PassArg, &passName::ID, 229 PassInfo::NormalCtor_t(callDefaultCtor<passName>), 230 CFGOnly, is_analysis) { 231 PassRegistry::getPassRegistry()->registerPass(*this); 232 } 233}; 234 235 236/// RegisterAnalysisGroup - Register a Pass as a member of an analysis _group_. 237/// Analysis groups are used to define an interface (which need not derive from 238/// Pass) that is required by passes to do their job. Analysis Groups differ 239/// from normal analyses because any available implementation of the group will 240/// be used if it is available. 241/// 242/// If no analysis implementing the interface is available, a default 243/// implementation is created and added. A pass registers itself as the default 244/// implementation by specifying 'true' as the second template argument of this 245/// class. 246/// 247/// In addition to registering itself as an analysis group member, a pass must 248/// register itself normally as well. Passes may be members of multiple groups 249/// and may still be "required" specifically by name. 250/// 251/// The actual interface may also be registered as well (by not specifying the 252/// second template argument). The interface should be registered to associate 253/// a nice name with the interface. 254/// 255class RegisterAGBase : public PassInfo { 256public: 257 RegisterAGBase(const char *Name, 258 const void *InterfaceID, 259 const void *PassID = nullptr, 260 bool isDefault = false); 261}; 262 263template<typename Interface, bool Default = false> 264struct RegisterAnalysisGroup : public RegisterAGBase { 265 explicit RegisterAnalysisGroup(PassInfo &RPB) 266 : RegisterAGBase(RPB.getPassName(), 267 &Interface::ID, RPB.getTypeInfo(), 268 Default) { 269 } 270 271 explicit RegisterAnalysisGroup(const char *Name) 272 : RegisterAGBase(Name, &Interface::ID) { 273 } 274}; 275 276#define INITIALIZE_ANALYSIS_GROUP(agName, name, defaultPass) \ 277 static void* initialize##agName##AnalysisGroupOnce(PassRegistry &Registry) { \ 278 initialize##defaultPass##Pass(Registry); \ 279 PassInfo *AI = new PassInfo(name, & agName :: ID); \ 280 Registry.registerAnalysisGroup(& agName ::ID, 0, *AI, false, true); \ 281 return AI; \ 282 } \ 283 void llvm::initialize##agName##AnalysisGroup(PassRegistry &Registry) { \ 284 CALL_ONCE_INITIALIZATION(initialize##agName##AnalysisGroupOnce) \ 285 } 286 287 288#define INITIALIZE_AG_PASS(passName, agName, arg, name, cfg, analysis, def) \ 289 static void* initialize##passName##PassOnce(PassRegistry &Registry) { \ 290 if (!def) initialize##agName##AnalysisGroup(Registry); \ 291 PassInfo *PI = new PassInfo(name, arg, & passName ::ID, \ 292 PassInfo::NormalCtor_t(callDefaultCtor< passName >), cfg, analysis); \ 293 Registry.registerPass(*PI, true); \ 294 \ 295 PassInfo *AI = new PassInfo(name, & agName :: ID); \ 296 Registry.registerAnalysisGroup(& agName ::ID, & passName ::ID, \ 297 *AI, def, true); \ 298 return AI; \ 299 } \ 300 void llvm::initialize##passName##Pass(PassRegistry &Registry) { \ 301 CALL_ONCE_INITIALIZATION(initialize##passName##PassOnce) \ 302 } 303 304 305#define INITIALIZE_AG_PASS_BEGIN(passName, agName, arg, n, cfg, analysis, def) \ 306 static void* initialize##passName##PassOnce(PassRegistry &Registry) { \ 307 if (!def) initialize##agName##AnalysisGroup(Registry); 308 309#define INITIALIZE_AG_PASS_END(passName, agName, arg, n, cfg, analysis, def) \ 310 PassInfo *PI = new PassInfo(n, arg, & passName ::ID, \ 311 PassInfo::NormalCtor_t(callDefaultCtor< passName >), cfg, analysis); \ 312 Registry.registerPass(*PI, true); \ 313 \ 314 PassInfo *AI = new PassInfo(n, & agName :: ID); \ 315 Registry.registerAnalysisGroup(& agName ::ID, & passName ::ID, \ 316 *AI, def, true); \ 317 return AI; \ 318 } \ 319 void llvm::initialize##passName##Pass(PassRegistry &Registry) { \ 320 CALL_ONCE_INITIALIZATION(initialize##passName##PassOnce) \ 321 } 322 323//===--------------------------------------------------------------------------- 324/// PassRegistrationListener class - This class is meant to be derived from by 325/// clients that are interested in which passes get registered and unregistered 326/// at runtime (which can be because of the RegisterPass constructors being run 327/// as the program starts up, or may be because a shared object just got 328/// loaded). Deriving from the PassRegistrationListener class automatically 329/// registers your object to receive callbacks indicating when passes are loaded 330/// and removed. 331/// 332struct PassRegistrationListener { 333 334 /// PassRegistrationListener ctor - Add the current object to the list of 335 /// PassRegistrationListeners... 336 PassRegistrationListener(); 337 338 /// dtor - Remove object from list of listeners... 339 /// 340 virtual ~PassRegistrationListener(); 341 342 /// Callback functions - These functions are invoked whenever a pass is loaded 343 /// or removed from the current executable. 344 /// 345 virtual void passRegistered(const PassInfo *) {} 346 347 /// enumeratePasses - Iterate over the registered passes, calling the 348 /// passEnumerate callback on each PassInfo object. 349 /// 350 void enumeratePasses(); 351 352 /// passEnumerate - Callback function invoked when someone calls 353 /// enumeratePasses on this PassRegistrationListener object. 354 /// 355 virtual void passEnumerate(const PassInfo *) {} 356}; 357 358 359} // End llvm namespace 360 361#endif 362