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00001 //===- llvm/PassManagers.h - Pass Infrastructure classes -------*- C++ -*-===//00002 //00003 // The LLVM Compiler Infrastructure00004 //00005 // This file is distributed under the University of Illinois Open Source00006 // License. See LICENSE.TXT for details.00007 //00008 //===----------------------------------------------------------------------===//00009 //

00010 // This file declares the LLVM Pass Manager infrastructure.00011 //00012//===----------------------------------------------------------------------===//0001300014#ifndef LLVM_PASSMANAGERS_H00015#define LLVM_PASSMANAGERS_H0001600017 #include "llvm/Pass.h"00018#include "llvm/ADT/SmallVector.h"00019#include "llvm/ADT/SmallPtrSet.h"00020#include "llvm/ADT/DenseMap.h"00021#include

00022#include 0002300024 //===----------------------------------------------------------------------===//00025 // Overview:00026 // The Pass Manager Infrastructure manages passes. It's responsibilities are:00027 //00028 // o Manage optimization pass execution order00029 // o Make required Analysis information available before pass P is run00030 // o Release memory occupied by dead passes00031 // o If Analysis information is dirtied by a pass then regenerate Analysis00032 // information before it is consumed by another pass.00033 //00034 // Pass Manager Infrastructure uses multiple pass managers. They are

00035 // PassManager, FunctionPassManager, MPPassManager, FPPassManager, BBPassManager.00036 // This class hierarchy uses multiple inheritance but pass managers do not00037 // derive from another pass manager.00038 //00039 // PassManager and FunctionPassManager are two top-level pass manager that

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00040 // represents the external interface of this entire pass manager infrastucture.00041 //00042 // Important classes :00043 //00044 // [o] class PMTopLevelManager;00045 //00046 // Two top level managers, PassManager and FunctionPassManager, derive from00047 // PMTopLevelManager. PMTopLevelManager manages information used by top level00048 // managers such as last user info.00049 //00050 // [o] class PMDataManager;00051 //00052 // PMDataManager manages information, e.g. list of available analysis info,00053 // used by a pass manager to manage execution order of passes. It also provides00054 // a place to implement common pass manager APIs. All pass managers derive from00055 // PMDataManager.00056 //00057 // [o] class BBPassManager : public FunctionPass, public PMDataManager;00058 //00059 // BBPassManager manages BasicBlockPasses.00060 //00061 // [o] class FunctionPassManager;00062 //

00063 // This is a external interface used by JIT to manage FunctionPasses. This00064 // interface relies on FunctionPassManagerImpl to do all the tasks.00065 //00066 // [o] class FunctionPassManagerImpl : public ModulePass, PMDataManager,00067 // public PMTopLevelManager;00068 //00069 // FunctionPassManagerImpl is a top level manager. It manages FPPassManagers00070 //00071 // [o] class FPPassManager : public ModulePass, public PMDataManager;00072 //00073 // FPPassManager manages FunctionPasses and BBPassManagers00074 //00075 // [o] class MPPassManager : public Pass, public PMDataManager;00076 //00077 // MPPassManager manages ModulePasses and FPPassManagers00078 //00079 // [o] class PassManager;00080 //00081 // This is a external interface used by various tools to manages passes. It00082 // relies on PassManagerImpl to do all the tasks.00083 //00084 // [o] class PassManagerImpl : public Pass, public PMDataManager,00085 // public PMTopLevelManager00086 //00087 // PassManagerImpl is a top level pass manager responsible for managing

00088 // MPPassManagers.00089 //===----------------------------------------------------------------------===//0009000091 #include "llvm/Support/PrettyStackTrace.h"0009200093 namespace llvm {00094 class Module;00095 class Pass;00096 class StringRef;00097 class Value;00098 class Timer;00099 class PMDataManager;0010000101 // enums for debugging strings00102enumPassDebuggingString {00103 EXECUTION_MSG, // "Executing Pass '"00104 MODIFICATION_MSG, // "' Made Modification '"00105 FREEING_MSG, // " Freeing Pass '"

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00106 ON_BASICBLOCK_MSG, // "' on BasicBlock '" + PassName + "'...\n"00107 ON_FUNCTION_MSG, // "' on Function '" + FunctionName + "'...\n"00108 ON_MODULE_MSG, // "' on Module '" + ModuleName + "'...\n"00109 ON_REGION_MSG, // " 'on Region ...\n'"00110 ON_LOOP_MSG, // " 'on Loop ...\n'"00111 ON_CG_MSG// "' on Call Graph ...\n'"00112 };0011300114 /// PassManagerPrettyStackEntry - This is used to print informative information00115 /// about what pass is running when/if a stack trace is generated.00116class PassManagerPrettyStackEntry : publicPrettyStackTraceEntry {00117 Pass *P;00118 Value *V;00119 Module *M;00120 public:00121 explicitPassManagerPrettyStackEntry(Pass *p)00122 : P(p), V(0), M(0) {} // When P is releaseMemory'd.00123 PassManagerPrettyStackEntry(Pass *p, Value &v)00124 : P(p), V(&v), M(0) {} // When P is run on V00125 PassManagerPrettyStackEntry(Pass *p, Module &m)00126 : P(p), V(0), M(&m) {} // When P is run on M0012700128 /// print - Emit information about this stack frame to OS.

00129 virtualvoidprint(raw_ostream&OS) const;00130 };001310013200133 //===----------------------------------------------------------------------===//00134 // PMStack00135 //00136 /// PMStack - This class implements a stack data structure of PMDataManager00137 /// pointers.00138 ///00139 /// Top level pass managers (see PassManager.cpp) maintain active Pass Managers00140 /// using PMStack. Each Pass implements assignPassManager() to connect itself00141 /// with appropriate manager. assignPassManager() walks PMStack to find00142 /// suitable manager.00143class PMStack {00144 public:00145 typedef std::vector::const_reverse_iterator iterator;00146 iteratorbegin() const { return S.rbegin(); }00147 iteratorend() const { return S.rend(); }0014800149 voidpop();00150 PMDataManager *top() const { return S.back(); }00151 voidpush(PMDataManager *PM);00152 boolempty() const { return S.empty(); }00153

00154 voiddump() const;0015500156 private:00157 std::vector S;00158 };001590016000161 //===----------------------------------------------------------------------===//00162 // PMTopLevelManager00163 //00164 /// PMTopLevelManager manages LastUser info and collects common APIs used by00165 /// top level pass managers.00166class PMTopLevelManager {00167 protected:00168 explicitPMTopLevelManager(PMDataManager *PMDM);0016900170 virtualunsignedgetNumContainedManagers() const {00171 return (unsigned)PassManagers.size();

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00172 }0017300174 voidinitializeAllAnalysisInfo();0017500176 private:00177 virtualPMDataManager *getAsPMDataManager() = 0;00178 virtualPassManagerType getTopLevelPassManagerType() = 0;0017900180 public:00181 /// Schedule pass P for execution. Make sure that passes required by00182 /// P are run before P is run. Update analysis info maintained by00183 /// the manager. Remove dead passes. This is a recursive function.00184 voidschedulePass(Pass *P);0018500186 /// Set pass P as the last user of the given analysis passes.00187 voidsetLastUser(constSmallVectorImpl &AnalysisPasses, Pass *P);0018800189 /// Collect passes whose last user is P00190 voidcollectLastUses(SmallVectorImpl &LastUses, Pass *P);0019100192 /// Find the pass that implements Analysis AID. Search immutable00193 /// passes and all pass managers. If desired pass is not found00194 /// then return NULL.

00195 Pass *findAnalysisPass(AnalysisID AID);0019600197 /// Find analysis usage information for the pass P.00198 AnalysisUsage *findAnalysisUsage(Pass *P);0019900200 virtual~PMTopLevelManager();0020100202 /// Add immutable pass and initialize it.00203 inlinevoidaddImmutablePass(ImmutablePass *P) {00204 P->initializePass();00205 ImmutablePasses.push_back(P);00206 }0020700208 inlineSmallVectorImpl& getImmutablePasses() {00209 return ImmutablePasses;00210 }0021100212 voidaddPassManager(PMDataManager *Manager) {00213 PassManagers.push_back(Manager);00214 }0021500216 // Add Manager into the list of managers that are not directly00217 // maintained by this top level pass manager00218 inlinevoidaddIndirectPassManager(PMDataManager *Manager) {00219 IndirectPassManagers.push_back(Manager);

00220 }0022100222 // Print passes managed by this top level manager.00223 voiddumpPasses() const;00224 voiddumpArguments() const;0022500226 // Active Pass Managers00227 PMStackactiveStack;0022800229 protected:0023000231 /// Collection of pass managers00232 SmallVectorPassManagers;0023300234 private:0023500236 /// Collection of pass managers that are not directly maintained00237 /// by this pass manager

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00238 SmallVector IndirectPassManagers;0023900240 // Map to keep track of last user of the analysis pass.00241 // LastUser->second is the last user of Lastuser->first.00242 DenseMap LastUser;0024300244 // Map to keep track of passes that are last used by a pass.00245 // This inverse map is initialized at PM->run() based on00246 // LastUser map.00247 DenseMap InversedLastUser;0024800249 /// Immutable passes are managed by top level manager.00250 SmallVector ImmutablePasses;0025100252 DenseMap AnUsageMap;00253 };00254002550025600257 //===----------------------------------------------------------------------===//00258 // PMDataManager0025900260 /// PMDataManager provides the common place to manage the analysis data

00261 /// used by pass managers.00262class PMDataManager {00263 public:0026400265 explicitPMDataManager() : TPM(NULL), Depth(0) {00266 initializeAnalysisInfo();00267 }0026800269 virtual~PMDataManager();0027000271 virtualPass *getAsPass() = 0;0027200273 /// Augment AvailableAnalysis by adding analysis made available by pass P.00274 voidrecordAvailableAnalysis(Pass *P);0027500276 /// verifyPreservedAnalysis -- Verify analysis presreved by pass P.00277 voidverifyPreservedAnalysis(Pass *P);0027800279 /// Remove Analysis that is not preserved by the pass00280 voidremoveNotPreservedAnalysis(Pass *P);0028100282 /// Remove dead passes used by P.00283 voidremoveDeadPasses(Pass *P, StringRef Msg,00284 enumPassDebuggingString);00285

00286 /// Remove P.00287 voidfreePass(Pass *P, StringRef Msg,00288 enumPassDebuggingString);0028900290 /// Add pass P into the PassVector. Update00291 /// AvailableAnalysis appropriately if ProcessAnalysis is true.00292 voidadd(Pass *P, bool ProcessAnalysis = true);0029300294 /// Add RequiredPass into list of lower level passes required by pass P.00295 /// RequiredPass is run on the fly by Pass Manager when P requests it00296 /// through getAnalysis interface.00297 virtualvoidaddLowerLevelRequiredPass(Pass *P, Pass *RequiredPass);0029800299 virtualPass *getOnTheFlyPass(Pass *P,AnalysisID PI, Function &F);0030000301 /// Initialize available analysis information.00302 voidinitializeAnalysisInfo() {00303 AvailableAnalysis.clear();

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00304 for (unsigned i = 0; i < PMT_Last; ++i)00305 InheritedAnalysis[i] = NULL;00306 }0030700308 // Return true if P preserves high level analysis used by other00309 // passes that are managed by this manager.00310 boolpreserveHigherLevelAnalysis(Pass *P);003110031200313 /// Populate RequiredPasses with analysis pass that are required by00314 /// pass P and are available. Populate ReqPassNotAvailable with analysis00315 /// pass that are required by pass P but are not available.00316 voidcollectRequiredAnalysis(SmallVectorImpl &RequiredPasses,00317 SmallVectorImpl &ReqPassNotAvailable,00318 Pass *P);0031900320 /// All Required analyses should be available to the pass as it runs! Here00321 /// we fill in the AnalysisImpls member of the pass so that it can00322 /// successfully use the getAnalysis() method to retrieve the00323 /// implementations it needs.00324 voidinitializeAnalysisImpl(Pass *P);0032500326 /// Find the pass that implements Analysis AID. If desired pass is not found

00327 /// then return NULL.00328 Pass *findAnalysisPass(AnalysisID AID, bool Direction);0032900330 // Access toplevel manager00331 PMTopLevelManager *getTopLevelManager() { returnTPM; }00332 voidsetTopLevelManager(PMTopLevelManager *T) { TPM = T; }0033300334 unsignedgetDepth() const { return Depth; }00335 voidsetDepth(unsigned newDepth) { Depth = newDepth; }0033600337 // Print routines used by debug-pass00338 voiddumpLastUses(Pass *P, unsigned Offset) const;00339 voiddumpPassArguments() const;00340 voiddumpPassInfo(Pass *P, enumPassDebuggingString S1,00341 enumPassDebuggingString S2, StringRef Msg);00342 voiddumpRequiredSet(constPass *P) const;00343 voiddumpPreservedSet(constPass *P) const;0034400345 virtualunsignedgetNumContainedPasses() const {00346 return (unsigned)PassVector.size();00347 }0034800349 virtualPassManagerTypegetPassManagerType() const {00350 assert ( 0 && "Invalid use of getPassManagerType");00351 returnPMT_Unknown;

00352 }0035300354 std::map *getAvailableAnalysis() {00355 return &AvailableAnalysis;00356 }0035700358 // Collect AvailableAnalysis from all the active Pass Managers.00359 voidpopulateInheritedAnalysis(PMStack &PMS) {00360 unsigned Index = 0;00361 for (PMStack::iteratorI = PMS.begin(), E = PMS.end();00362 I != E; ++I)00363 InheritedAnalysis[Index++] = (*I)->getAvailableAnalysis();00364 }0036500366 protected:0036700368 // Top level manager.00369 PMTopLevelManager *TPM;

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0037000371 // Collection of pass that are managed by this manager00372 SmallVectorPassVector;0037300374 // Collection of Analysis provided by Parent pass manager and00375 // used by current pass manager. At at time there can not be more00376 // then PMT_Last active pass mangers.00377 std::map *InheritedAnalysis[PMT_Last];003780037900380 /// isPassDebuggingExecutionsOrMore - Return true if -debug-pass=Executions00381 /// or higher is specified.00382 boolisPassDebuggingExecutionsOrMore() const;0038300384 private:00385 void dumpAnalysisUsage(StringRef Msg, constPass *P,00386 constAnalysisUsage::VectorType &Set) const;0038700388 // Set of available Analysis. This information is used while scheduling00389 // pass. If a pass requires an analysis which is not available then00390 // the required analysis pass is scheduled to run before the pass itself is00391 // scheduled to run.00392 std::map AvailableAnalysis;

0039300394 // Collection of higher level analysis used by the pass managed by00395 // this manager.00396 SmallVector HigherLevelAnalysis;0039700398 unsigned Depth;00399 };0040000401 //===----------------------------------------------------------------------===//00402 // FPPassManager00403 //00404 /// FPPassManager manages BBPassManagers and FunctionPasses.00405 /// It batches all function passes and basic block pass managers together and00406 /// sequence them to process one function at a time before processing next00407 /// function.00408class FPPassManager : publicModulePass, publicPMDataManager {00409 public:00410 staticcharID;00411 explicitFPPassManager()00412 : ModulePass(ID), PMDataManager() { }0041300414 /// run - Execute all of the passes scheduled for execution. Keep track of00415 /// whether any of the passes modifies the module, and if so, return true.00416 boolrunOnFunction(Function &F);00417 boolrunOnModule(Module &M);

0041800419 /// cleanup - After running all passes, clean up pass manager cache.00420 voidcleanup();0042100422 /// doInitialization - Run all of the initializers for the function passes.00423 ///00424 booldoInitialization(Module &M);0042500426 /// doFinalization - Run all of the finalizers for the function passes.00427 ///00428 booldoFinalization(Module &M);0042900430 virtualPMDataManager *getAsPMDataManager() { returnthis; }00431 virtualPass *getAsPass() { returnthis; }0043200433 /// Pass Manager itself does not invalidate any analysis info.00434 voidgetAnalysisUsage(AnalysisUsage &Info) const {00435 Info.setPreservesAll();

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00436 }0043700438 // Print passes managed by this manager00439 voiddumpPassStructure(unsigned Offset);0044000441 virtualconstchar *getPassName() const {00442 return"Function Pass Manager";00443 }0044400445 FunctionPass *getContainedPass(unsigned N) {00446 assert ( N < PassVector.size() && "Pass number out of range!");00447 FunctionPass *FP = static_cast(PassVector[N]);00448 return FP;00449 }0045000451 virtualPassManagerTypegetPassManagerType() const {00452 returnPMT_FunctionPassManager;00453 }00454 };0045500456 Timer *getPassTimer(Pass *);0045700458 }

0045900460 #endif

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Copyright 2003-2012 University of Illinois at Urbana-Champaign. All Rights Reserved.

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