1 //===- PassManager.cpp - LLVM Pass Infrastructure Implementation ----------===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by Devang Patel and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the LLVM Pass Manager infrastructure.
12 //===----------------------------------------------------------------------===//
15 #include "llvm/PassManagers.h"
16 #include "llvm/Support/CommandLine.h"
17 #include "llvm/Support/Timer.h"
18 #include "llvm/Module.h"
19 #include "llvm/ModuleProvider.h"
20 #include "llvm/Support/Streams.h"
21 #include "llvm/Support/ManagedStatic.h"
27 // See PassManagers.h for Pass Manager infrastructure overview.
31 //===----------------------------------------------------------------------===//
32 // Pass debugging information. Often it is useful to find out what pass is
33 // running when a crash occurs in a utility. When this library is compiled with
34 // debugging on, a command line option (--debug-pass) is enabled that causes the
35 // pass name to be printed before it executes.
38 // Different debug levels that can be enabled...
40 None, Arguments, Structure, Executions, Details
43 static cl::opt<enum PassDebugLevel>
44 PassDebugging("debug-pass", cl::Hidden,
45 cl::desc("Print PassManager debugging information"),
47 clEnumVal(None , "disable debug output"),
48 clEnumVal(Arguments , "print pass arguments to pass to 'opt'"),
49 clEnumVal(Structure , "print pass structure before run()"),
50 clEnumVal(Executions, "print pass name before it is executed"),
51 clEnumVal(Details , "print pass details when it is executed"),
53 } // End of llvm namespace
57 //===----------------------------------------------------------------------===//
60 /// BBPassManager manages BasicBlockPass. It batches all the
61 /// pass together and sequence them to process one basic block before
62 /// processing next basic block.
63 class VISIBILITY_HIDDEN BBPassManager : public PMDataManager,
68 explicit BBPassManager(int Depth)
69 : PMDataManager(Depth), FunctionPass((intptr_t)&ID) {}
71 /// Execute all of the passes scheduled for execution. Keep track of
72 /// whether any of the passes modifies the function, and if so, return true.
73 bool runOnFunction(Function &F);
75 /// Pass Manager itself does not invalidate any analysis info.
76 void getAnalysisUsage(AnalysisUsage &Info) const {
77 Info.setPreservesAll();
80 bool doInitialization(Module &M);
81 bool doInitialization(Function &F);
82 bool doFinalization(Module &M);
83 bool doFinalization(Function &F);
85 virtual const char *getPassName() const {
86 return "BasicBlock Pass Manager";
89 // Print passes managed by this manager
90 void dumpPassStructure(unsigned Offset) {
91 llvm::cerr << std::string(Offset*2, ' ') << "BasicBlockPass Manager\n";
92 for (unsigned Index = 0; Index < getNumContainedPasses(); ++Index) {
93 BasicBlockPass *BP = getContainedPass(Index);
94 BP->dumpPassStructure(Offset + 1);
95 dumpLastUses(BP, Offset+1);
99 BasicBlockPass *getContainedPass(unsigned N) {
100 assert ( N < PassVector.size() && "Pass number out of range!");
101 BasicBlockPass *BP = static_cast<BasicBlockPass *>(PassVector[N]);
105 virtual PassManagerType getPassManagerType() const {
106 return PMT_BasicBlockPassManager;
110 char BBPassManager::ID = 0;
115 //===----------------------------------------------------------------------===//
116 // FunctionPassManagerImpl
118 /// FunctionPassManagerImpl manages FPPassManagers
119 class FunctionPassManagerImpl : public Pass,
120 public PMDataManager,
121 public PMTopLevelManager {
124 explicit FunctionPassManagerImpl(int Depth) :
125 Pass((intptr_t)&ID), PMDataManager(Depth),
126 PMTopLevelManager(TLM_Function) { }
128 /// add - Add a pass to the queue of passes to run. This passes ownership of
129 /// the Pass to the PassManager. When the PassManager is destroyed, the pass
130 /// will be destroyed as well, so there is no need to delete the pass. This
131 /// implies that all passes MUST be allocated with 'new'.
136 /// run - Execute all of the passes scheduled for execution. Keep track of
137 /// whether any of the passes modifies the module, and if so, return true.
138 bool run(Function &F);
140 /// doInitialization - Run all of the initializers for the function passes.
142 bool doInitialization(Module &M);
144 /// doFinalization - Run all of the finalizers for the function passes.
146 bool doFinalization(Module &M);
148 /// Pass Manager itself does not invalidate any analysis info.
149 void getAnalysisUsage(AnalysisUsage &Info) const {
150 Info.setPreservesAll();
153 inline void addTopLevelPass(Pass *P) {
155 if (ImmutablePass *IP = dynamic_cast<ImmutablePass *> (P)) {
157 // P is a immutable pass and it will be managed by this
158 // top level manager. Set up analysis resolver to connect them.
159 AnalysisResolver *AR = new AnalysisResolver(*this);
161 initializeAnalysisImpl(P);
162 addImmutablePass(IP);
163 recordAvailableAnalysis(IP);
165 P->assignPassManager(activeStack);
170 FPPassManager *getContainedManager(unsigned N) {
171 assert ( N < PassManagers.size() && "Pass number out of range!");
172 FPPassManager *FP = static_cast<FPPassManager *>(PassManagers[N]);
177 char FunctionPassManagerImpl::ID = 0;
178 //===----------------------------------------------------------------------===//
181 /// MPPassManager manages ModulePasses and function pass managers.
182 /// It batches all Module passes passes and function pass managers together and
183 /// sequence them to process one module.
184 class MPPassManager : public Pass, public PMDataManager {
188 explicit MPPassManager(int Depth) :
189 Pass((intptr_t)&ID), PMDataManager(Depth) { }
191 // Delete on the fly managers.
192 virtual ~MPPassManager() {
193 for (std::map<Pass *, FunctionPassManagerImpl *>::iterator
194 I = OnTheFlyManagers.begin(), E = OnTheFlyManagers.end();
196 FunctionPassManagerImpl *FPP = I->second;
201 /// run - Execute all of the passes scheduled for execution. Keep track of
202 /// whether any of the passes modifies the module, and if so, return true.
203 bool runOnModule(Module &M);
205 /// Pass Manager itself does not invalidate any analysis info.
206 void getAnalysisUsage(AnalysisUsage &Info) const {
207 Info.setPreservesAll();
210 /// Add RequiredPass into list of lower level passes required by pass P.
211 /// RequiredPass is run on the fly by Pass Manager when P requests it
212 /// through getAnalysis interface.
213 virtual void addLowerLevelRequiredPass(Pass *P, Pass *RequiredPass);
215 /// Return function pass corresponding to PassInfo PI, that is
216 /// required by module pass MP. Instantiate analysis pass, by using
217 /// its runOnFunction() for function F.
218 virtual Pass* getOnTheFlyPass(Pass *MP, const PassInfo *PI, Function &F);
220 virtual const char *getPassName() const {
221 return "Module Pass Manager";
224 // Print passes managed by this manager
225 void dumpPassStructure(unsigned Offset) {
226 llvm::cerr << std::string(Offset*2, ' ') << "ModulePass Manager\n";
227 for (unsigned Index = 0; Index < getNumContainedPasses(); ++Index) {
228 ModulePass *MP = getContainedPass(Index);
229 MP->dumpPassStructure(Offset + 1);
230 if (FunctionPassManagerImpl *FPP = OnTheFlyManagers[MP])
231 FPP->dumpPassStructure(Offset + 2);
232 dumpLastUses(MP, Offset+1);
236 ModulePass *getContainedPass(unsigned N) {
237 assert ( N < PassVector.size() && "Pass number out of range!");
238 ModulePass *MP = static_cast<ModulePass *>(PassVector[N]);
242 virtual PassManagerType getPassManagerType() const {
243 return PMT_ModulePassManager;
247 /// Collection of on the fly FPPassManagers. These managers manage
248 /// function passes that are required by module passes.
249 std::map<Pass *, FunctionPassManagerImpl *> OnTheFlyManagers;
252 char MPPassManager::ID = 0;
253 //===----------------------------------------------------------------------===//
257 /// PassManagerImpl manages MPPassManagers
258 class PassManagerImpl : public Pass,
259 public PMDataManager,
260 public PMTopLevelManager {
264 explicit PassManagerImpl(int Depth) :
265 Pass((intptr_t)&ID), PMDataManager(Depth),
266 PMTopLevelManager(TLM_Pass) { }
268 /// add - Add a pass to the queue of passes to run. This passes ownership of
269 /// the Pass to the PassManager. When the PassManager is destroyed, the pass
270 /// will be destroyed as well, so there is no need to delete the pass. This
271 /// implies that all passes MUST be allocated with 'new'.
276 /// run - Execute all of the passes scheduled for execution. Keep track of
277 /// whether any of the passes modifies the module, and if so, return true.
280 /// Pass Manager itself does not invalidate any analysis info.
281 void getAnalysisUsage(AnalysisUsage &Info) const {
282 Info.setPreservesAll();
285 inline void addTopLevelPass(Pass *P) {
287 if (ImmutablePass *IP = dynamic_cast<ImmutablePass *> (P)) {
289 // P is a immutable pass and it will be managed by this
290 // top level manager. Set up analysis resolver to connect them.
291 AnalysisResolver *AR = new AnalysisResolver(*this);
293 initializeAnalysisImpl(P);
294 addImmutablePass(IP);
295 recordAvailableAnalysis(IP);
297 P->assignPassManager(activeStack);
302 MPPassManager *getContainedManager(unsigned N) {
303 assert ( N < PassManagers.size() && "Pass number out of range!");
304 MPPassManager *MP = static_cast<MPPassManager *>(PassManagers[N]);
310 char PassManagerImpl::ID = 0;
311 } // End of llvm namespace
315 //===----------------------------------------------------------------------===//
316 // TimingInfo Class - This class is used to calculate information about the
317 // amount of time each pass takes to execute. This only happens when
318 // -time-passes is enabled on the command line.
321 class VISIBILITY_HIDDEN TimingInfo {
322 std::map<Pass*, Timer> TimingData;
326 // Use 'create' member to get this.
327 TimingInfo() : TG("... Pass execution timing report ...") {}
329 // TimingDtor - Print out information about timing information
331 // Delete all of the timers...
333 // TimerGroup is deleted next, printing the report.
336 // createTheTimeInfo - This method either initializes the TheTimeInfo pointer
337 // to a non null value (if the -time-passes option is enabled) or it leaves it
338 // null. It may be called multiple times.
339 static void createTheTimeInfo();
341 void passStarted(Pass *P) {
343 if (dynamic_cast<PMDataManager *>(P))
346 std::map<Pass*, Timer>::iterator I = TimingData.find(P);
347 if (I == TimingData.end())
348 I=TimingData.insert(std::make_pair(P, Timer(P->getPassName(), TG))).first;
349 I->second.startTimer();
351 void passEnded(Pass *P) {
353 if (dynamic_cast<PMDataManager *>(P))
356 std::map<Pass*, Timer>::iterator I = TimingData.find(P);
357 assert (I != TimingData.end() && "passStarted/passEnded not nested right!");
358 I->second.stopTimer();
362 static TimingInfo *TheTimeInfo;
364 } // End of anon namespace
366 //===----------------------------------------------------------------------===//
367 // PMTopLevelManager implementation
369 /// Initialize top level manager. Create first pass manager.
370 PMTopLevelManager::PMTopLevelManager (enum TopLevelManagerType t) {
373 MPPassManager *MPP = new MPPassManager(1);
374 MPP->setTopLevelManager(this);
376 activeStack.push(MPP);
378 else if (t == TLM_Function) {
379 FPPassManager *FPP = new FPPassManager(1);
380 FPP->setTopLevelManager(this);
382 activeStack.push(FPP);
386 /// Set pass P as the last user of the given analysis passes.
387 void PMTopLevelManager::setLastUser(SmallVector<Pass *, 12> &AnalysisPasses,
390 for (SmallVector<Pass *, 12>::iterator I = AnalysisPasses.begin(),
391 E = AnalysisPasses.end(); I != E; ++I) {
398 // If AP is the last user of other passes then make P last user of
400 for (std::map<Pass *, Pass *>::iterator LUI = LastUser.begin(),
401 LUE = LastUser.end(); LUI != LUE; ++LUI) {
402 if (LUI->second == AP)
403 LastUser[LUI->first] = P;
408 /// Collect passes whose last user is P
409 void PMTopLevelManager::collectLastUses(SmallVector<Pass *, 12> &LastUses,
411 for (std::map<Pass *, Pass *>::iterator LUI = LastUser.begin(),
412 LUE = LastUser.end(); LUI != LUE; ++LUI)
413 if (LUI->second == P)
414 LastUses.push_back(LUI->first);
417 /// Schedule pass P for execution. Make sure that passes required by
418 /// P are run before P is run. Update analysis info maintained by
419 /// the manager. Remove dead passes. This is a recursive function.
420 void PMTopLevelManager::schedulePass(Pass *P) {
422 // TODO : Allocate function manager for this pass, other wise required set
423 // may be inserted into previous function manager
425 // Give pass a chance to prepare the stage.
426 P->preparePassManager(activeStack);
428 AnalysisUsage AnUsage;
429 P->getAnalysisUsage(AnUsage);
430 const std::vector<AnalysisID> &RequiredSet = AnUsage.getRequiredSet();
431 for (std::vector<AnalysisID>::const_iterator I = RequiredSet.begin(),
432 E = RequiredSet.end(); I != E; ++I) {
434 Pass *AnalysisPass = findAnalysisPass(*I);
436 AnalysisPass = (*I)->createPass();
437 // Schedule this analysis run first only if it is not a lower level
438 // analysis pass. Lower level analsyis passes are run on the fly.
439 if (P->getPotentialPassManagerType () >=
440 AnalysisPass->getPotentialPassManagerType())
441 schedulePass(AnalysisPass);
447 // Now all required passes are available.
451 /// Find the pass that implements Analysis AID. Search immutable
452 /// passes and all pass managers. If desired pass is not found
453 /// then return NULL.
454 Pass *PMTopLevelManager::findAnalysisPass(AnalysisID AID) {
457 // Check pass managers
458 for (std::vector<Pass *>::iterator I = PassManagers.begin(),
459 E = PassManagers.end(); P == NULL && I != E; ++I) {
460 PMDataManager *PMD = dynamic_cast<PMDataManager *>(*I);
461 assert(PMD && "This is not a PassManager");
462 P = PMD->findAnalysisPass(AID, false);
465 // Check other pass managers
466 for (std::vector<PMDataManager *>::iterator I = IndirectPassManagers.begin(),
467 E = IndirectPassManagers.end(); P == NULL && I != E; ++I)
468 P = (*I)->findAnalysisPass(AID, false);
470 for (std::vector<ImmutablePass *>::iterator I = ImmutablePasses.begin(),
471 E = ImmutablePasses.end(); P == NULL && I != E; ++I) {
472 const PassInfo *PI = (*I)->getPassInfo();
476 // If Pass not found then check the interfaces implemented by Immutable Pass
478 const std::vector<const PassInfo*> &ImmPI = PI->getInterfacesImplemented();
479 if (std::find(ImmPI.begin(), ImmPI.end(), AID) != ImmPI.end())
487 // Print passes managed by this top level manager.
488 void PMTopLevelManager::dumpPasses() const {
490 if (PassDebugging < Structure)
493 // Print out the immutable passes
494 for (unsigned i = 0, e = ImmutablePasses.size(); i != e; ++i) {
495 ImmutablePasses[i]->dumpPassStructure(0);
498 for (std::vector<Pass *>::const_iterator I = PassManagers.begin(),
499 E = PassManagers.end(); I != E; ++I)
500 (*I)->dumpPassStructure(1);
503 void PMTopLevelManager::dumpArguments() const {
505 if (PassDebugging < Arguments)
508 cerr << "Pass Arguments: ";
509 for (std::vector<Pass *>::const_iterator I = PassManagers.begin(),
510 E = PassManagers.end(); I != E; ++I) {
511 PMDataManager *PMD = dynamic_cast<PMDataManager *>(*I);
512 assert(PMD && "This is not a PassManager");
513 PMD->dumpPassArguments();
518 void PMTopLevelManager::initializeAllAnalysisInfo() {
520 for (std::vector<Pass *>::iterator I = PassManagers.begin(),
521 E = PassManagers.end(); I != E; ++I) {
522 PMDataManager *PMD = dynamic_cast<PMDataManager *>(*I);
523 assert(PMD && "This is not a PassManager");
524 PMD->initializeAnalysisInfo();
527 // Initailize other pass managers
528 for (std::vector<PMDataManager *>::iterator I = IndirectPassManagers.begin(),
529 E = IndirectPassManagers.end(); I != E; ++I)
530 (*I)->initializeAnalysisInfo();
534 PMTopLevelManager::~PMTopLevelManager() {
535 for (std::vector<Pass *>::iterator I = PassManagers.begin(),
536 E = PassManagers.end(); I != E; ++I)
539 for (std::vector<ImmutablePass *>::iterator
540 I = ImmutablePasses.begin(), E = ImmutablePasses.end(); I != E; ++I)
543 PassManagers.clear();
546 //===----------------------------------------------------------------------===//
547 // PMDataManager implementation
549 /// Return true IFF pass P's required analysis set does not required new
551 bool PMDataManager::manageablePass(Pass *P) {
554 // If this pass is not preserving information that is required by a
555 // pass maintained by higher level pass manager then do not insert
556 // this pass into current manager. Use new manager. For example,
557 // For example, If FunctionPass F is not preserving ModulePass Info M1
558 // that is used by another ModulePass M2 then do not insert F in
559 // current function pass manager.
563 /// Augement AvailableAnalysis by adding analysis made available by pass P.
564 void PMDataManager::recordAvailableAnalysis(Pass *P) {
566 if (const PassInfo *PI = P->getPassInfo()) {
567 AvailableAnalysis[PI] = P;
569 //This pass is the current implementation of all of the interfaces it
570 //implements as well.
571 const std::vector<const PassInfo*> &II = PI->getInterfacesImplemented();
572 for (unsigned i = 0, e = II.size(); i != e; ++i)
573 AvailableAnalysis[II[i]] = P;
577 // Return true if P preserves high level analysis used by other
578 // passes managed by this manager
579 bool PMDataManager::preserveHigherLevelAnalysis(Pass *P) {
581 AnalysisUsage AnUsage;
582 P->getAnalysisUsage(AnUsage);
584 if (AnUsage.getPreservesAll())
587 const std::vector<AnalysisID> &PreservedSet = AnUsage.getPreservedSet();
588 for (std::vector<Pass *>::iterator I = HigherLevelAnalysis.begin(),
589 E = HigherLevelAnalysis.end(); I != E; ++I) {
591 if (!dynamic_cast<ImmutablePass*>(P1)
592 && std::find(PreservedSet.begin(), PreservedSet.end(), P1->getPassInfo()) ==
600 /// verifyPreservedAnalysis -- Verify analysis presreved by pass P.
601 void PMDataManager::verifyPreservedAnalysis(Pass *P) {
602 AnalysisUsage AnUsage;
603 P->getAnalysisUsage(AnUsage);
604 const std::vector<AnalysisID> &PreservedSet = AnUsage.getPreservedSet();
606 // Verify preserved analysis
607 for (std::vector<AnalysisID>::const_iterator I = PreservedSet.begin(),
608 E = PreservedSet.end(); I != E; ++I) {
610 Pass *AP = findAnalysisPass(AID, true);
612 AP->verifyAnalysis();
616 /// Remove Analyss not preserved by Pass P
617 void PMDataManager::removeNotPreservedAnalysis(Pass *P) {
618 AnalysisUsage AnUsage;
619 P->getAnalysisUsage(AnUsage);
620 if (AnUsage.getPreservesAll())
623 const std::vector<AnalysisID> &PreservedSet = AnUsage.getPreservedSet();
624 for (std::map<AnalysisID, Pass*>::iterator I = AvailableAnalysis.begin(),
625 E = AvailableAnalysis.end(); I != E; ) {
626 std::map<AnalysisID, Pass*>::iterator Info = I++;
627 if (!dynamic_cast<ImmutablePass*>(Info->second)
628 && std::find(PreservedSet.begin(), PreservedSet.end(), Info->first) ==
630 // Remove this analysis
631 AvailableAnalysis.erase(Info);
634 // Check inherited analysis also. If P is not preserving analysis
635 // provided by parent manager then remove it here.
636 for (unsigned Index = 0; Index < PMT_Last; ++Index) {
638 if (!InheritedAnalysis[Index])
641 for (std::map<AnalysisID, Pass*>::iterator
642 I = InheritedAnalysis[Index]->begin(),
643 E = InheritedAnalysis[Index]->end(); I != E; ) {
644 std::map<AnalysisID, Pass *>::iterator Info = I++;
645 if (!dynamic_cast<ImmutablePass*>(Info->second)
646 && std::find(PreservedSet.begin(), PreservedSet.end(), Info->first) ==
648 // Remove this analysis
649 InheritedAnalysis[Index]->erase(Info);
655 /// Remove analysis passes that are not used any longer
656 void PMDataManager::removeDeadPasses(Pass *P, const char *Msg,
657 enum PassDebuggingString DBG_STR) {
659 SmallVector<Pass *, 12> DeadPasses;
661 // If this is a on the fly manager then it does not have TPM.
665 TPM->collectLastUses(DeadPasses, P);
667 for (SmallVector<Pass *, 12>::iterator I = DeadPasses.begin(),
668 E = DeadPasses.end(); I != E; ++I) {
670 dumpPassInfo(*I, FREEING_MSG, DBG_STR, Msg);
672 if (TheTimeInfo) TheTimeInfo->passStarted(*I);
673 (*I)->releaseMemory();
674 if (TheTimeInfo) TheTimeInfo->passEnded(*I);
676 std::map<AnalysisID, Pass*>::iterator Pos =
677 AvailableAnalysis.find((*I)->getPassInfo());
679 // It is possible that pass is already removed from the AvailableAnalysis
680 if (Pos != AvailableAnalysis.end())
681 AvailableAnalysis.erase(Pos);
685 /// Add pass P into the PassVector. Update
686 /// AvailableAnalysis appropriately if ProcessAnalysis is true.
687 void PMDataManager::add(Pass *P,
688 bool ProcessAnalysis) {
690 // This manager is going to manage pass P. Set up analysis resolver
692 AnalysisResolver *AR = new AnalysisResolver(*this);
695 // If a FunctionPass F is the last user of ModulePass info M
696 // then the F's manager, not F, records itself as a last user of M.
697 SmallVector<Pass *, 12> TransferLastUses;
699 if (ProcessAnalysis) {
701 // At the moment, this pass is the last user of all required passes.
702 SmallVector<Pass *, 12> LastUses;
703 SmallVector<Pass *, 8> RequiredPasses;
704 SmallVector<AnalysisID, 8> ReqAnalysisNotAvailable;
706 unsigned PDepth = this->getDepth();
708 collectRequiredAnalysis(RequiredPasses,
709 ReqAnalysisNotAvailable, P);
710 for (SmallVector<Pass *, 8>::iterator I = RequiredPasses.begin(),
711 E = RequiredPasses.end(); I != E; ++I) {
712 Pass *PRequired = *I;
715 PMDataManager &DM = PRequired->getResolver()->getPMDataManager();
716 RDepth = DM.getDepth();
718 if (PDepth == RDepth)
719 LastUses.push_back(PRequired);
720 else if (PDepth > RDepth) {
721 // Let the parent claim responsibility of last use
722 TransferLastUses.push_back(PRequired);
723 // Keep track of higher level analysis used by this manager.
724 HigherLevelAnalysis.push_back(PRequired);
726 assert (0 && "Unable to accomodate Required Pass");
729 // Set P as P's last user until someone starts using P.
730 // However, if P is a Pass Manager then it does not need
731 // to record its last user.
732 if (!dynamic_cast<PMDataManager *>(P))
733 LastUses.push_back(P);
734 TPM->setLastUser(LastUses, P);
736 if (!TransferLastUses.empty()) {
737 Pass *My_PM = dynamic_cast<Pass *>(this);
738 TPM->setLastUser(TransferLastUses, My_PM);
739 TransferLastUses.clear();
742 // Now, take care of required analysises that are not available.
743 for (SmallVector<AnalysisID, 8>::iterator
744 I = ReqAnalysisNotAvailable.begin(),
745 E = ReqAnalysisNotAvailable.end() ;I != E; ++I) {
746 Pass *AnalysisPass = (*I)->createPass();
747 this->addLowerLevelRequiredPass(P, AnalysisPass);
750 // Take a note of analysis required and made available by this pass.
751 // Remove the analysis not preserved by this pass
752 removeNotPreservedAnalysis(P);
753 recordAvailableAnalysis(P);
757 PassVector.push_back(P);
761 /// Populate RP with analysis pass that are required by
762 /// pass P and are available. Populate RP_NotAvail with analysis
763 /// pass that are required by pass P but are not available.
764 void PMDataManager::collectRequiredAnalysis(SmallVector<Pass *, 8>&RP,
765 SmallVector<AnalysisID, 8> &RP_NotAvail,
767 AnalysisUsage AnUsage;
768 P->getAnalysisUsage(AnUsage);
769 const std::vector<AnalysisID> &RequiredSet = AnUsage.getRequiredSet();
770 for (std::vector<AnalysisID>::const_iterator
771 I = RequiredSet.begin(), E = RequiredSet.end();
774 if (Pass *AnalysisPass = findAnalysisPass(*I, true))
775 RP.push_back(AnalysisPass);
777 RP_NotAvail.push_back(AID);
780 const std::vector<AnalysisID> &IDs = AnUsage.getRequiredTransitiveSet();
781 for (std::vector<AnalysisID>::const_iterator I = IDs.begin(),
782 E = IDs.end(); I != E; ++I) {
784 if (Pass *AnalysisPass = findAnalysisPass(*I, true))
785 RP.push_back(AnalysisPass);
787 RP_NotAvail.push_back(AID);
791 // All Required analyses should be available to the pass as it runs! Here
792 // we fill in the AnalysisImpls member of the pass so that it can
793 // successfully use the getAnalysis() method to retrieve the
794 // implementations it needs.
796 void PMDataManager::initializeAnalysisImpl(Pass *P) {
797 AnalysisUsage AnUsage;
798 P->getAnalysisUsage(AnUsage);
800 for (std::vector<const PassInfo *>::const_iterator
801 I = AnUsage.getRequiredSet().begin(),
802 E = AnUsage.getRequiredSet().end(); I != E; ++I) {
803 Pass *Impl = findAnalysisPass(*I, true);
805 // This may be analysis pass that is initialized on the fly.
806 // If that is not the case then it will raise an assert when it is used.
808 AnalysisResolver *AR = P->getResolver();
809 AR->addAnalysisImplsPair(*I, Impl);
813 /// Find the pass that implements Analysis AID. If desired pass is not found
814 /// then return NULL.
815 Pass *PMDataManager::findAnalysisPass(AnalysisID AID, bool SearchParent) {
817 // Check if AvailableAnalysis map has one entry.
818 std::map<AnalysisID, Pass*>::const_iterator I = AvailableAnalysis.find(AID);
820 if (I != AvailableAnalysis.end())
823 // Search Parents through TopLevelManager
825 return TPM->findAnalysisPass(AID);
830 // Print list of passes that are last used by P.
831 void PMDataManager::dumpLastUses(Pass *P, unsigned Offset) const{
833 SmallVector<Pass *, 12> LUses;
835 // If this is a on the fly manager then it does not have TPM.
839 TPM->collectLastUses(LUses, P);
841 for (SmallVector<Pass *, 12>::iterator I = LUses.begin(),
842 E = LUses.end(); I != E; ++I) {
843 llvm::cerr << "--" << std::string(Offset*2, ' ');
844 (*I)->dumpPassStructure(0);
848 void PMDataManager::dumpPassArguments() const {
849 for(std::vector<Pass *>::const_iterator I = PassVector.begin(),
850 E = PassVector.end(); I != E; ++I) {
851 if (PMDataManager *PMD = dynamic_cast<PMDataManager *>(*I))
852 PMD->dumpPassArguments();
854 if (const PassInfo *PI = (*I)->getPassInfo())
855 if (!PI->isAnalysisGroup())
856 cerr << " -" << PI->getPassArgument();
860 void PMDataManager::dumpPassInfo(Pass *P, enum PassDebuggingString S1,
861 enum PassDebuggingString S2,
863 if (PassDebugging < Executions)
865 cerr << (void*)this << std::string(getDepth()*2+1, ' ');
868 cerr << "Executing Pass '" << P->getPassName();
870 case MODIFICATION_MSG:
871 cerr << "Made Modification '" << P->getPassName();
874 cerr << " Freeing Pass '" << P->getPassName();
880 case ON_BASICBLOCK_MSG:
881 cerr << "' on BasicBlock '" << Msg << "'...\n";
883 case ON_FUNCTION_MSG:
884 cerr << "' on Function '" << Msg << "'...\n";
887 cerr << "' on Module '" << Msg << "'...\n";
890 cerr << "' on Loop " << Msg << "'...\n";
893 cerr << "' on Call Graph " << Msg << "'...\n";
900 void PMDataManager::dumpAnalysisSetInfo(const char *Msg, Pass *P,
901 const std::vector<AnalysisID> &Set)
903 if (PassDebugging >= Details && !Set.empty()) {
904 cerr << (void*)P << std::string(getDepth()*2+3, ' ') << Msg << " Analyses:";
905 for (unsigned i = 0; i != Set.size(); ++i) {
907 cerr << " " << Set[i]->getPassName();
913 /// Add RequiredPass into list of lower level passes required by pass P.
914 /// RequiredPass is run on the fly by Pass Manager when P requests it
915 /// through getAnalysis interface.
916 /// This should be handled by specific pass manager.
917 void PMDataManager::addLowerLevelRequiredPass(Pass *P, Pass *RequiredPass) {
919 TPM->dumpArguments();
922 assert (0 && "Unable to handle Pass that requires lower level Analysis pass");
926 PMDataManager::~PMDataManager() {
928 for (std::vector<Pass *>::iterator I = PassVector.begin(),
929 E = PassVector.end(); I != E; ++I)
935 //===----------------------------------------------------------------------===//
936 // NOTE: Is this the right place to define this method ?
937 // getAnalysisToUpdate - Return an analysis result or null if it doesn't exist
938 Pass *AnalysisResolver::getAnalysisToUpdate(AnalysisID ID, bool dir) const {
939 return PM.findAnalysisPass(ID, dir);
942 Pass *AnalysisResolver::findImplPass(Pass *P, const PassInfo *AnalysisPI,
944 return PM.getOnTheFlyPass(P, AnalysisPI, F);
947 //===----------------------------------------------------------------------===//
948 // BBPassManager implementation
950 /// Execute all of the passes scheduled for execution by invoking
951 /// runOnBasicBlock method. Keep track of whether any of the passes modifies
952 /// the function, and if so, return true.
954 BBPassManager::runOnFunction(Function &F) {
956 if (F.isDeclaration())
959 bool Changed = doInitialization(F);
961 for (Function::iterator I = F.begin(), E = F.end(); I != E; ++I)
962 for (unsigned Index = 0; Index < getNumContainedPasses(); ++Index) {
963 BasicBlockPass *BP = getContainedPass(Index);
964 AnalysisUsage AnUsage;
965 BP->getAnalysisUsage(AnUsage);
967 dumpPassInfo(BP, EXECUTION_MSG, ON_BASICBLOCK_MSG, I->getNameStart());
968 dumpAnalysisSetInfo("Required", BP, AnUsage.getRequiredSet());
970 initializeAnalysisImpl(BP);
972 if (TheTimeInfo) TheTimeInfo->passStarted(BP);
973 Changed |= BP->runOnBasicBlock(*I);
974 if (TheTimeInfo) TheTimeInfo->passEnded(BP);
977 dumpPassInfo(BP, MODIFICATION_MSG, ON_BASICBLOCK_MSG, I->getNameStart());
978 dumpAnalysisSetInfo("Preserved", BP, AnUsage.getPreservedSet());
980 verifyPreservedAnalysis(BP);
981 removeNotPreservedAnalysis(BP);
982 recordAvailableAnalysis(BP);
983 removeDeadPasses(BP, I->getNameStart(), ON_BASICBLOCK_MSG);
986 return Changed |= doFinalization(F);
989 // Implement doInitialization and doFinalization
990 inline bool BBPassManager::doInitialization(Module &M) {
991 bool Changed = false;
993 for (unsigned Index = 0; Index < getNumContainedPasses(); ++Index) {
994 BasicBlockPass *BP = getContainedPass(Index);
995 Changed |= BP->doInitialization(M);
1001 inline bool BBPassManager::doFinalization(Module &M) {
1002 bool Changed = false;
1004 for (unsigned Index = 0; Index < getNumContainedPasses(); ++Index) {
1005 BasicBlockPass *BP = getContainedPass(Index);
1006 Changed |= BP->doFinalization(M);
1012 inline bool BBPassManager::doInitialization(Function &F) {
1013 bool Changed = false;
1015 for (unsigned Index = 0; Index < getNumContainedPasses(); ++Index) {
1016 BasicBlockPass *BP = getContainedPass(Index);
1017 Changed |= BP->doInitialization(F);
1023 inline bool BBPassManager::doFinalization(Function &F) {
1024 bool Changed = false;
1026 for (unsigned Index = 0; Index < getNumContainedPasses(); ++Index) {
1027 BasicBlockPass *BP = getContainedPass(Index);
1028 Changed |= BP->doFinalization(F);
1035 //===----------------------------------------------------------------------===//
1036 // FunctionPassManager implementation
1038 /// Create new Function pass manager
1039 FunctionPassManager::FunctionPassManager(ModuleProvider *P) {
1040 FPM = new FunctionPassManagerImpl(0);
1041 // FPM is the top level manager.
1042 FPM->setTopLevelManager(FPM);
1044 PMDataManager *PMD = dynamic_cast<PMDataManager *>(FPM);
1045 AnalysisResolver *AR = new AnalysisResolver(*PMD);
1046 FPM->setResolver(AR);
1051 FunctionPassManager::~FunctionPassManager() {
1055 /// add - Add a pass to the queue of passes to run. This passes
1056 /// ownership of the Pass to the PassManager. When the
1057 /// PassManager_X is destroyed, the pass will be destroyed as well, so
1058 /// there is no need to delete the pass. (TODO delete passes.)
1059 /// This implies that all passes MUST be allocated with 'new'.
1060 void FunctionPassManager::add(Pass *P) {
1064 /// run - Execute all of the passes scheduled for execution. Keep
1065 /// track of whether any of the passes modifies the function, and if
1066 /// so, return true.
1068 bool FunctionPassManager::run(Function &F) {
1070 if (MP->materializeFunction(&F, &errstr)) {
1071 cerr << "Error reading bitcode file: " << errstr << "\n";
1078 /// doInitialization - Run all of the initializers for the function passes.
1080 bool FunctionPassManager::doInitialization() {
1081 return FPM->doInitialization(*MP->getModule());
1084 /// doFinalization - Run all of the finalizers for the function passes.
1086 bool FunctionPassManager::doFinalization() {
1087 return FPM->doFinalization(*MP->getModule());
1090 //===----------------------------------------------------------------------===//
1091 // FunctionPassManagerImpl implementation
1093 inline bool FunctionPassManagerImpl::doInitialization(Module &M) {
1094 bool Changed = false;
1096 for (unsigned Index = 0; Index < getNumContainedManagers(); ++Index) {
1097 FPPassManager *FP = getContainedManager(Index);
1098 Changed |= FP->doInitialization(M);
1104 inline bool FunctionPassManagerImpl::doFinalization(Module &M) {
1105 bool Changed = false;
1107 for (unsigned Index = 0; Index < getNumContainedManagers(); ++Index) {
1108 FPPassManager *FP = getContainedManager(Index);
1109 Changed |= FP->doFinalization(M);
1115 // Execute all the passes managed by this top level manager.
1116 // Return true if any function is modified by a pass.
1117 bool FunctionPassManagerImpl::run(Function &F) {
1119 bool Changed = false;
1121 TimingInfo::createTheTimeInfo();
1126 initializeAllAnalysisInfo();
1127 for (unsigned Index = 0; Index < getNumContainedManagers(); ++Index) {
1128 FPPassManager *FP = getContainedManager(Index);
1129 Changed |= FP->runOnFunction(F);
1134 //===----------------------------------------------------------------------===//
1135 // FPPassManager implementation
1137 char FPPassManager::ID = 0;
1138 /// Print passes managed by this manager
1139 void FPPassManager::dumpPassStructure(unsigned Offset) {
1140 llvm::cerr << std::string(Offset*2, ' ') << "FunctionPass Manager\n";
1141 for (unsigned Index = 0; Index < getNumContainedPasses(); ++Index) {
1142 FunctionPass *FP = getContainedPass(Index);
1143 FP->dumpPassStructure(Offset + 1);
1144 dumpLastUses(FP, Offset+1);
1149 /// Execute all of the passes scheduled for execution by invoking
1150 /// runOnFunction method. Keep track of whether any of the passes modifies
1151 /// the function, and if so, return true.
1152 bool FPPassManager::runOnFunction(Function &F) {
1154 bool Changed = false;
1156 if (F.isDeclaration())
1159 for (unsigned Index = 0; Index < getNumContainedPasses(); ++Index) {
1160 FunctionPass *FP = getContainedPass(Index);
1162 AnalysisUsage AnUsage;
1163 FP->getAnalysisUsage(AnUsage);
1165 dumpPassInfo(FP, EXECUTION_MSG, ON_FUNCTION_MSG, F.getNameStart());
1166 dumpAnalysisSetInfo("Required", FP, AnUsage.getRequiredSet());
1168 initializeAnalysisImpl(FP);
1170 if (TheTimeInfo) TheTimeInfo->passStarted(FP);
1171 Changed |= FP->runOnFunction(F);
1172 if (TheTimeInfo) TheTimeInfo->passEnded(FP);
1175 dumpPassInfo(FP, MODIFICATION_MSG, ON_FUNCTION_MSG, F.getNameStart());
1176 dumpAnalysisSetInfo("Preserved", FP, AnUsage.getPreservedSet());
1178 verifyPreservedAnalysis(FP);
1179 removeNotPreservedAnalysis(FP);
1180 recordAvailableAnalysis(FP);
1181 removeDeadPasses(FP, F.getNameStart(), ON_FUNCTION_MSG);
1186 bool FPPassManager::runOnModule(Module &M) {
1188 bool Changed = doInitialization(M);
1190 for(Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
1191 this->runOnFunction(*I);
1193 return Changed |= doFinalization(M);
1196 inline bool FPPassManager::doInitialization(Module &M) {
1197 bool Changed = false;
1199 for (unsigned Index = 0; Index < getNumContainedPasses(); ++Index) {
1200 FunctionPass *FP = getContainedPass(Index);
1201 Changed |= FP->doInitialization(M);
1207 inline bool FPPassManager::doFinalization(Module &M) {
1208 bool Changed = false;
1210 for (unsigned Index = 0; Index < getNumContainedPasses(); ++Index) {
1211 FunctionPass *FP = getContainedPass(Index);
1212 Changed |= FP->doFinalization(M);
1218 //===----------------------------------------------------------------------===//
1219 // MPPassManager implementation
1221 /// Execute all of the passes scheduled for execution by invoking
1222 /// runOnModule method. Keep track of whether any of the passes modifies
1223 /// the module, and if so, return true.
1225 MPPassManager::runOnModule(Module &M) {
1226 bool Changed = false;
1228 for (unsigned Index = 0; Index < getNumContainedPasses(); ++Index) {
1229 ModulePass *MP = getContainedPass(Index);
1231 AnalysisUsage AnUsage;
1232 MP->getAnalysisUsage(AnUsage);
1234 dumpPassInfo(MP, EXECUTION_MSG, ON_MODULE_MSG, M.getModuleIdentifier().c_str());
1235 dumpAnalysisSetInfo("Required", MP, AnUsage.getRequiredSet());
1237 initializeAnalysisImpl(MP);
1239 if (TheTimeInfo) TheTimeInfo->passStarted(MP);
1240 Changed |= MP->runOnModule(M);
1241 if (TheTimeInfo) TheTimeInfo->passEnded(MP);
1244 dumpPassInfo(MP, MODIFICATION_MSG, ON_MODULE_MSG, M.getModuleIdentifier().c_str());
1245 dumpAnalysisSetInfo("Preserved", MP, AnUsage.getPreservedSet());
1247 verifyPreservedAnalysis(MP);
1248 removeNotPreservedAnalysis(MP);
1249 recordAvailableAnalysis(MP);
1250 removeDeadPasses(MP, M.getModuleIdentifier().c_str(), ON_MODULE_MSG);
1255 /// Add RequiredPass into list of lower level passes required by pass P.
1256 /// RequiredPass is run on the fly by Pass Manager when P requests it
1257 /// through getAnalysis interface.
1258 void MPPassManager::addLowerLevelRequiredPass(Pass *P, Pass *RequiredPass) {
1260 assert (P->getPotentialPassManagerType() == PMT_ModulePassManager
1261 && "Unable to handle Pass that requires lower level Analysis pass");
1262 assert ((P->getPotentialPassManagerType() <
1263 RequiredPass->getPotentialPassManagerType())
1264 && "Unable to handle Pass that requires lower level Analysis pass");
1266 FunctionPassManagerImpl *FPP = OnTheFlyManagers[P];
1268 FPP = new FunctionPassManagerImpl(0);
1269 // FPP is the top level manager.
1270 FPP->setTopLevelManager(FPP);
1272 OnTheFlyManagers[P] = FPP;
1274 FPP->add(RequiredPass);
1276 // Register P as the last user of RequiredPass.
1277 SmallVector<Pass *, 12> LU;
1278 LU.push_back(RequiredPass);
1279 FPP->setLastUser(LU, P);
1282 /// Return function pass corresponding to PassInfo PI, that is
1283 /// required by module pass MP. Instantiate analysis pass, by using
1284 /// its runOnFunction() for function F.
1285 Pass* MPPassManager::getOnTheFlyPass(Pass *MP, const PassInfo *PI,
1287 AnalysisID AID = PI;
1288 FunctionPassManagerImpl *FPP = OnTheFlyManagers[MP];
1289 assert (FPP && "Unable to find on the fly pass");
1292 return (dynamic_cast<PMTopLevelManager *>(FPP))->findAnalysisPass(AID);
1296 //===----------------------------------------------------------------------===//
1297 // PassManagerImpl implementation
1299 /// run - Execute all of the passes scheduled for execution. Keep track of
1300 /// whether any of the passes modifies the module, and if so, return true.
1301 bool PassManagerImpl::run(Module &M) {
1303 bool Changed = false;
1305 TimingInfo::createTheTimeInfo();
1310 initializeAllAnalysisInfo();
1311 for (unsigned Index = 0; Index < getNumContainedManagers(); ++Index) {
1312 MPPassManager *MP = getContainedManager(Index);
1313 Changed |= MP->runOnModule(M);
1318 //===----------------------------------------------------------------------===//
1319 // PassManager implementation
1321 /// Create new pass manager
1322 PassManager::PassManager() {
1323 PM = new PassManagerImpl(0);
1324 // PM is the top level manager
1325 PM->setTopLevelManager(PM);
1328 PassManager::~PassManager() {
1332 /// add - Add a pass to the queue of passes to run. This passes ownership of
1333 /// the Pass to the PassManager. When the PassManager is destroyed, the pass
1334 /// will be destroyed as well, so there is no need to delete the pass. This
1335 /// implies that all passes MUST be allocated with 'new'.
1337 PassManager::add(Pass *P) {
1341 /// run - Execute all of the passes scheduled for execution. Keep track of
1342 /// whether any of the passes modifies the module, and if so, return true.
1344 PassManager::run(Module &M) {
1348 //===----------------------------------------------------------------------===//
1349 // TimingInfo Class - This class is used to calculate information about the
1350 // amount of time each pass takes to execute. This only happens with
1351 // -time-passes is enabled on the command line.
1353 bool llvm::TimePassesIsEnabled = false;
1354 static cl::opt<bool,true>
1355 EnableTiming("time-passes", cl::location(TimePassesIsEnabled),
1356 cl::desc("Time each pass, printing elapsed time for each on exit"));
1358 // createTheTimeInfo - This method either initializes the TheTimeInfo pointer to
1359 // a non null value (if the -time-passes option is enabled) or it leaves it
1360 // null. It may be called multiple times.
1361 void TimingInfo::createTheTimeInfo() {
1362 if (!TimePassesIsEnabled || TheTimeInfo) return;
1364 // Constructed the first time this is called, iff -time-passes is enabled.
1365 // This guarantees that the object will be constructed before static globals,
1366 // thus it will be destroyed before them.
1367 static ManagedStatic<TimingInfo> TTI;
1368 TheTimeInfo = &*TTI;
1371 /// If TimingInfo is enabled then start pass timer.
1372 void StartPassTimer(Pass *P) {
1374 TheTimeInfo->passStarted(P);
1377 /// If TimingInfo is enabled then stop pass timer.
1378 void StopPassTimer(Pass *P) {
1380 TheTimeInfo->passEnded(P);
1383 //===----------------------------------------------------------------------===//
1384 // PMStack implementation
1387 // Pop Pass Manager from the stack and clear its analysis info.
1388 void PMStack::pop() {
1390 PMDataManager *Top = this->top();
1391 Top->initializeAnalysisInfo();
1396 // Push PM on the stack and set its top level manager.
1397 void PMStack::push(Pass *P) {
1399 PMDataManager *Top = NULL;
1400 PMDataManager *PM = dynamic_cast<PMDataManager *>(P);
1401 assert (PM && "Unable to push. Pass Manager expected");
1403 if (this->empty()) {
1408 PMTopLevelManager *TPM = Top->getTopLevelManager();
1410 assert (TPM && "Unable to find top level manager");
1411 TPM->addIndirectPassManager(PM);
1412 PM->setTopLevelManager(TPM);
1418 // Dump content of the pass manager stack.
1419 void PMStack::dump() {
1420 for(std::deque<PMDataManager *>::iterator I = S.begin(),
1421 E = S.end(); I != E; ++I) {
1422 Pass *P = dynamic_cast<Pass *>(*I);
1423 printf("%s ", P->getPassName());
1429 /// Find appropriate Module Pass Manager in the PM Stack and
1430 /// add self into that manager.
1431 void ModulePass::assignPassManager(PMStack &PMS,
1432 PassManagerType PreferredType) {
1434 // Find Module Pass Manager
1435 while(!PMS.empty()) {
1436 PassManagerType TopPMType = PMS.top()->getPassManagerType();
1437 if (TopPMType == PreferredType)
1438 break; // We found desired pass manager
1439 else if (TopPMType > PMT_ModulePassManager)
1440 PMS.pop(); // Pop children pass managers
1445 PMS.top()->add(this);
1448 /// Find appropriate Function Pass Manager or Call Graph Pass Manager
1449 /// in the PM Stack and add self into that manager.
1450 void FunctionPass::assignPassManager(PMStack &PMS,
1451 PassManagerType PreferredType) {
1453 // Find Module Pass Manager (TODO : Or Call Graph Pass Manager)
1454 while(!PMS.empty()) {
1455 if (PMS.top()->getPassManagerType() > PMT_FunctionPassManager)
1460 FPPassManager *FPP = dynamic_cast<FPPassManager *>(PMS.top());
1462 // Create new Function Pass Manager
1464 assert(!PMS.empty() && "Unable to create Function Pass Manager");
1465 PMDataManager *PMD = PMS.top();
1467 // [1] Create new Function Pass Manager
1468 FPP = new FPPassManager(PMD->getDepth() + 1);
1470 // [2] Set up new manager's top level manager
1471 PMTopLevelManager *TPM = PMD->getTopLevelManager();
1472 TPM->addIndirectPassManager(FPP);
1474 // [3] Assign manager to manage this new manager. This may create
1475 // and push new managers into PMS
1476 Pass *P = dynamic_cast<Pass *>(FPP);
1478 // If Call Graph Pass Manager is active then use it to manage
1479 // this new Function Pass manager.
1480 if (PMD->getPassManagerType() == PMT_CallGraphPassManager)
1481 P->assignPassManager(PMS, PMT_CallGraphPassManager);
1483 P->assignPassManager(PMS);
1485 // [4] Push new manager into PMS
1489 // Assign FPP as the manager of this pass.
1493 /// Find appropriate Basic Pass Manager or Call Graph Pass Manager
1494 /// in the PM Stack and add self into that manager.
1495 void BasicBlockPass::assignPassManager(PMStack &PMS,
1496 PassManagerType PreferredType) {
1498 BBPassManager *BBP = NULL;
1500 // Basic Pass Manager is a leaf pass manager. It does not handle
1501 // any other pass manager.
1503 BBP = dynamic_cast<BBPassManager *>(PMS.top());
1505 // If leaf manager is not Basic Block Pass manager then create new
1506 // basic Block Pass manager.
1509 assert(!PMS.empty() && "Unable to create BasicBlock Pass Manager");
1510 PMDataManager *PMD = PMS.top();
1512 // [1] Create new Basic Block Manager
1513 BBP = new BBPassManager(PMD->getDepth() + 1);
1515 // [2] Set up new manager's top level manager
1516 // Basic Block Pass Manager does not live by itself
1517 PMTopLevelManager *TPM = PMD->getTopLevelManager();
1518 TPM->addIndirectPassManager(BBP);
1520 // [3] Assign manager to manage this new manager. This may create
1521 // and push new managers into PMS
1522 Pass *P = dynamic_cast<Pass *>(BBP);
1523 P->assignPassManager(PMS);
1525 // [4] Push new manager into PMS
1529 // Assign BBP as the manager of this pass.