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ce885e9f9d
* Implement pass memory freeing after the pass is unused * Expose PassManager typedef in Pass.h instead of PassManager.h git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@1617 91177308-0d34-0410-b5e6-96231b3b80d8
486 lines
17 KiB
C++
486 lines
17 KiB
C++
//===- llvm/PassManager.h - Container for Passes -----------------*- C++ -*--=//
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//
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// This file defines the PassManager class. This class is used to hold,
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// maintain, and optimize execution of Pass's. The PassManager class ensures
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// that analysis results are available before a pass runs, and that Pass's are
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// destroyed when the PassManager is destroyed.
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//
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// The PassManagerT template is instantiated three times to do its job.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_PASSMANAGER_H
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#define LLVM_PASSMANAGER_H
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#include "llvm/Pass.h"
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#include <string>
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//===----------------------------------------------------------------------===//
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// PMDebug class - a set of debugging functions that are enabled when compiling
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// with -g on. If compiling at -O, all functions are inlined noops.
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//
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struct PMDebug {
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#ifdef NDEBUG
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inline static void PrintPassStructure(Pass *) {}
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inline static void PrintPassInformation(unsigned,const char*,Pass*,Value*) {}
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inline static void PrintAnalysisSetInfo(unsigned,const char*,Pass *P,
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const Pass::AnalysisSet &) {}
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#else
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// If compiled in debug mode, these functions can be enabled by setting
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// -debug-pass on the command line of the tool being used.
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//
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static void PrintPassStructure(Pass *P);
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static void PrintPassInformation(unsigned,const char*,Pass *, Value *);
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static void PrintAnalysisSetInfo(unsigned,const char*,Pass *P,
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const Pass::AnalysisSet&);
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#endif
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};
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//===----------------------------------------------------------------------===//
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// Declare the PassManagerTraits which will be specialized...
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//
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template<class UnitType> class PassManagerTraits; // Do not define.
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//===----------------------------------------------------------------------===//
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// PassManagerT - Container object for passes. The PassManagerT destructor
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// deletes all passes contained inside of the PassManagerT, so you shouldn't
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// delete passes manually, and all passes should be dynamically allocated.
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//
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template<typename UnitType>
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class PassManagerT : public PassManagerTraits<UnitType>,public AnalysisResolver{
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typedef typename PassManagerTraits<UnitType>::PassClass PassClass;
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typedef typename PassManagerTraits<UnitType>::SubPassClass SubPassClass;
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typedef typename PassManagerTraits<UnitType>::BatcherClass BatcherClass;
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typedef typename PassManagerTraits<UnitType>::ParentClass ParentClass;
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typedef PassManagerTraits<UnitType> Traits;
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friend typename PassManagerTraits<UnitType>::PassClass;
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friend typename PassManagerTraits<UnitType>::SubPassClass;
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friend class PassManagerTraits<UnitType>;
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std::vector<PassClass*> Passes; // List of pass's to run
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// The parent of this pass manager...
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ParentClass * const Parent;
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// The current batcher if one is in use, or null
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BatcherClass *Batcher;
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// CurrentAnalyses - As the passes are being run, this map contains the
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// analyses that are available to the current pass for use. This is accessed
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// through the getAnalysis() function in this class and in Pass.
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//
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std::map<AnalysisID, Pass*> CurrentAnalyses;
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// LastUseOf - This map keeps track of the last usage in our pipeline of a
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// particular pass. When executing passes, the memory for .first is free'd
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// after .second is run.
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//
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std::map<Pass*, Pass*> LastUseOf;
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public:
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PassManagerT(ParentClass *Par = 0) : Parent(Par), Batcher(0) {}
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~PassManagerT() {
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// Delete all of the contained passes...
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for (std::vector<PassClass*>::iterator I = Passes.begin(), E = Passes.end();
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I != E; ++I)
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delete *I;
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}
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// run - Run all of the queued passes on the specified module in an optimal
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// way.
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virtual bool runOnUnit(UnitType *M) {
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bool MadeChanges = false;
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closeBatcher();
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CurrentAnalyses.clear();
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// LastUserOf - This contains the inverted LastUseOfMap...
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std::map<Pass *, std::vector<Pass*> > LastUserOf;
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for (std::map<Pass*, Pass*>::iterator I = LastUseOf.begin(),
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E = LastUseOf.end(); I != E; ++I)
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LastUserOf[I->second].push_back(I->first);
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// Output debug information...
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if (Parent == 0) PMDebug::PrintPassStructure(this);
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// Run all of the passes
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for (unsigned i = 0, e = Passes.size(); i < e; ++i) {
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PassClass *P = Passes[i];
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PMDebug::PrintPassInformation(getDepth(), "Executing Pass", P, (Value*)M);
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// Get information about what analyses the pass uses...
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std::vector<AnalysisID> Required, Destroyed, Provided;
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P->getAnalysisUsageInfo(Required, Destroyed, Provided);
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PMDebug::PrintAnalysisSetInfo(getDepth(), "Required", P, Required);
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#ifndef NDEBUG
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// All Required analyses should be available to the pass as it runs!
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for (Pass::AnalysisSet::iterator I = Required.begin(),
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E = Required.end(); I != E; ++I) {
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assert(getAnalysisOrNullUp(*I) && "Analysis used but not available!");
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}
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#endif
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// Run the sub pass!
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MadeChanges |= Traits::runPass(P, M);
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PMDebug::PrintAnalysisSetInfo(getDepth(), "Destroyed", P, Destroyed);
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PMDebug::PrintAnalysisSetInfo(getDepth(), "Provided", P, Provided);
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// Erase all analyses in the destroyed set...
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for (Pass::AnalysisSet::iterator I = Destroyed.begin(),
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E = Destroyed.end(); I != E; ++I)
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CurrentAnalyses.erase(*I);
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// Add all analyses in the provided set...
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for (Pass::AnalysisSet::iterator I = Provided.begin(),
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E = Provided.end(); I != E; ++I)
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CurrentAnalyses[*I] = P;
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// Free memory for any passes that we are the last use of...
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std::vector<Pass*> &DeadPass = LastUserOf[P];
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for (std::vector<Pass*>::iterator I = DeadPass.begin(),E = DeadPass.end();
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I != E; ++I) {
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PMDebug::PrintPassInformation(getDepth()+1, "Freeing Pass", *I,
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(Value*)M);
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(*I)->releaseMemory();
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}
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}
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return MadeChanges;
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}
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#ifndef NDEBUG
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// dumpPassStructure - Implement the -debug-passes=PassStructure option
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virtual void dumpPassStructure(unsigned Offset = 0) {
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std::cerr << std::string(Offset*2, ' ') << Traits::getPMName()
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<< " Pass Manager\n";
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for (std::vector<PassClass*>::iterator I = Passes.begin(), E = Passes.end();
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I != E; ++I) {
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PassClass *P = *I;
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P->dumpPassStructure(Offset+1);
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// Loop through and see which classes are destroyed after this one...
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for (std::map<Pass*, Pass*>::iterator I = LastUseOf.begin(),
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E = LastUseOf.end(); I != E; ++I) {
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if (P == I->second) {
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std::cerr << "Fr" << std::string(Offset*2, ' ');
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I->first->dumpPassStructure(0);
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}
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}
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}
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}
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#endif
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Pass *getAnalysisOrNullDown(AnalysisID ID) const {
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std::map<AnalysisID, Pass*>::const_iterator I = CurrentAnalyses.find(ID);
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if (I == CurrentAnalyses.end()) {
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if (Batcher)
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return ((AnalysisResolver*)Batcher)->getAnalysisOrNullDown(ID);
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return 0;
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}
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return I->second;
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}
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Pass *getAnalysisOrNullUp(AnalysisID ID) const {
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std::map<AnalysisID, Pass*>::const_iterator I = CurrentAnalyses.find(ID);
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if (I == CurrentAnalyses.end()) {
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if (Parent)
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return Parent->getAnalysisOrNullUp(ID);
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return 0;
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}
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return I->second;
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}
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// markPassUsed - Inform higher level pass managers (and ourselves)
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// that these analyses are being used by this pass. This is used to
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// make sure that analyses are not free'd before we have to use
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// them...
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//
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void markPassUsed(AnalysisID P, Pass *User) {
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std::map<AnalysisID, Pass*>::iterator I = CurrentAnalyses.find(P);
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if (I != CurrentAnalyses.end()) {
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LastUseOf[I->second] = User; // Local pass, extend the lifetime
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} else {
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// Pass not in current available set, must be a higher level pass
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// available to us, propogate to parent pass manager... We tell the
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// parent that we (the passmanager) are using the analysis so that it
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// frees the analysis AFTER this pass manager runs.
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//
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assert(Parent != 0 && "Pass available but not found!");
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Parent->markPassUsed(P, this);
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}
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}
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// Return the number of parent PassManagers that exist
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virtual unsigned getDepth() const {
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if (Parent == 0) return 0;
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return 1 + Parent->getDepth();
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}
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// add - Add a pass to the queue of passes to run. This passes ownership of
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// the Pass to the PassManager. When the PassManager is destroyed, the pass
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// will be destroyed as well, so there is no need to delete the pass. This
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// implies that all passes MUST be new'd.
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//
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void add(PassClass *P) {
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// Get information about what analyses the pass uses...
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std::vector<AnalysisID> Required, Destroyed, Provided;
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P->getAnalysisUsageInfo(Required, Destroyed, Provided);
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// Loop over all of the analyses used by this pass,
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for (std::vector<AnalysisID>::iterator I = Required.begin(),
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E = Required.end(); I != E; ++I) {
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if (getAnalysisOrNullDown(*I) == 0)
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add((PassClass*)I->createPass());
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}
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// Tell the pass to add itself to this PassManager... the way it does so
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// depends on the class of the pass, and is critical to laying out passes in
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// an optimal order..
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//
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P->addToPassManager(this, Required, Destroyed, Provided);
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}
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private:
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// addPass - These functions are used to implement the subclass specific
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// behaviors present in PassManager. Basically the add(Pass*) method ends up
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// reflecting its behavior into a Pass::addToPassManager call. Subclasses of
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// Pass override it specifically so that they can reflect the type
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// information inherent in "this" back to the PassManager.
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//
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// For generic Pass subclasses (which are interprocedural passes), we simply
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// add the pass to the end of the pass list and terminate any accumulation of
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// MethodPasses that are present.
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//
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void addPass(PassClass *P, Pass::AnalysisSet &Required,
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Pass::AnalysisSet &Destroyed, Pass::AnalysisSet &Provided) {
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// Providers are analysis classes which are forbidden to modify the module
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// they are operating on, so they are allowed to be reordered to before the
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// batcher...
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//
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if (Batcher && Provided.empty())
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closeBatcher(); // This pass cannot be batched!
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// Set the Resolver instance variable in the Pass so that it knows where to
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// find this object...
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//
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setAnalysisResolver(P, this);
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Passes.push_back(P);
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// Inform higher level pass managers (and ourselves) that these analyses are
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// being used by this pass. This is used to make sure that analyses are not
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// free'd before we have to use them...
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//
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for (std::vector<AnalysisID>::iterator I = Required.begin(),
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E = Required.end(); I != E; ++I)
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markPassUsed(*I, P); // Mark *I as used by P
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// Erase all analyses in the destroyed set...
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for (std::vector<AnalysisID>::iterator I = Destroyed.begin(),
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E = Destroyed.end(); I != E; ++I)
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CurrentAnalyses.erase(*I);
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// Add all analyses in the provided set...
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for (std::vector<AnalysisID>::iterator I = Provided.begin(),
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E = Provided.end(); I != E; ++I)
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CurrentAnalyses[*I] = P;
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// For now assume that our results are never used...
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LastUseOf[P] = P;
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}
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// For MethodPass subclasses, we must be sure to batch the MethodPasses
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// together in a MethodPassBatcher object so that all of the analyses are run
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// together a method at a time.
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//
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void addPass(SubPassClass *MP, Pass::AnalysisSet &Required,
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Pass::AnalysisSet &Destroyed, Pass::AnalysisSet &Provided) {
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if (Batcher == 0) // If we don't have a batcher yet, make one now.
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Batcher = new BatcherClass(this);
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// The Batcher will queue them passes up
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MP->addToPassManager(Batcher, Required, Destroyed, Provided);
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}
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// closeBatcher - Terminate the batcher that is being worked on.
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void closeBatcher() {
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if (Batcher) {
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Passes.push_back(Batcher);
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Batcher = 0;
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}
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}
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};
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//===----------------------------------------------------------------------===//
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// PassManagerTraits<BasicBlock> Specialization
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//
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// This pass manager is used to group together all of the BasicBlockPass's
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// into a single unit.
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//
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template<> struct PassManagerTraits<BasicBlock> : public BasicBlockPass {
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// PassClass - The type of passes tracked by this PassManager
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typedef BasicBlockPass PassClass;
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// SubPassClass - The types of classes that should be collated together
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// This is impossible to match, so BasicBlock instantiations of PassManagerT
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// do not collate.
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//
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typedef PassManagerT<Module> SubPassClass;
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// BatcherClass - The type to use for collation of subtypes... This class is
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// never instantiated for the PassManager<BasicBlock>, but it must be an
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// instance of PassClass to typecheck.
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//
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typedef PassClass BatcherClass;
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// ParentClass - The type of the parent PassManager...
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typedef PassManagerT<Method> ParentClass;
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// PMType - The type of the passmanager that subclasses this class
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typedef PassManagerT<BasicBlock> PMType;
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// runPass - Specify how the pass should be run on the UnitType
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static bool runPass(PassClass *P, BasicBlock *M) {
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// todo, init and finalize
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return P->runOnBasicBlock(M);
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}
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// getPMName() - Return the name of the unit the PassManager operates on for
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// debugging.
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const char *getPMName() const { return "BasicBlock"; }
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// Implement the BasicBlockPass interface...
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virtual bool doInitialization(Module *M);
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virtual bool runOnBasicBlock(BasicBlock *BB);
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virtual bool doFinalization(Module *M);
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};
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//===----------------------------------------------------------------------===//
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// PassManagerTraits<Method> Specialization
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//
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// This pass manager is used to group together all of the MethodPass's
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// into a single unit.
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//
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template<> struct PassManagerTraits<Method> : public MethodPass {
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// PassClass - The type of passes tracked by this PassManager
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typedef MethodPass PassClass;
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// SubPassClass - The types of classes that should be collated together
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typedef BasicBlockPass SubPassClass;
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// BatcherClass - The type to use for collation of subtypes...
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typedef PassManagerT<BasicBlock> BatcherClass;
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// ParentClass - The type of the parent PassManager...
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typedef PassManagerT<Module> ParentClass;
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// PMType - The type of the passmanager that subclasses this class
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typedef PassManagerT<Method> PMType;
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// runPass - Specify how the pass should be run on the UnitType
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static bool runPass(PassClass *P, Method *M) {
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return P->runOnMethod(M);
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}
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// getPMName() - Return the name of the unit the PassManager operates on for
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// debugging.
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const char *getPMName() const { return "Method"; }
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// Implement the MethodPass interface...
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virtual bool doInitialization(Module *M);
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virtual bool runOnMethod(Method *M);
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virtual bool doFinalization(Module *M);
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};
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//===----------------------------------------------------------------------===//
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// PassManagerTraits<Module> Specialization
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//
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// This is the top level PassManager implementation that holds generic passes.
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//
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template<> struct PassManagerTraits<Module> : public Pass {
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// PassClass - The type of passes tracked by this PassManager
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typedef Pass PassClass;
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// SubPassClass - The types of classes that should be collated together
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typedef MethodPass SubPassClass;
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// BatcherClass - The type to use for collation of subtypes...
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typedef PassManagerT<Method> BatcherClass;
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// ParentClass - The type of the parent PassManager...
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typedef AnalysisResolver ParentClass;
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// runPass - Specify how the pass should be run on the UnitType
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static bool runPass(PassClass *P, Module *M) { return P->run(M); }
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// getPMName() - Return the name of the unit the PassManager operates on for
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// debugging.
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const char *getPMName() const { return "Module"; }
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// run - Implement the Pass interface...
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virtual bool run(Module *M) {
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return ((PassManagerT<Module>*)this)->runOnUnit(M);
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}
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};
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//===----------------------------------------------------------------------===//
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// PassManagerTraits Method Implementations
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//
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// PassManagerTraits<BasicBlock> Implementations
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//
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inline bool PassManagerTraits<BasicBlock>::doInitialization(Module *M) {
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bool Changed = false;
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for (unsigned i = 0, e = ((PMType*)this)->Passes.size(); i != e; ++i)
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((PMType*)this)->Passes[i]->doInitialization(M);
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return Changed;
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}
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inline bool PassManagerTraits<BasicBlock>::runOnBasicBlock(BasicBlock *BB) {
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return ((PMType*)this)->runOnUnit(BB);
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}
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inline bool PassManagerTraits<BasicBlock>::doFinalization(Module *M) {
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bool Changed = false;
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for (unsigned i = 0, e = ((PMType*)this)->Passes.size(); i != e; ++i)
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((PMType*)this)->Passes[i]->doFinalization(M);
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return Changed;
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}
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// PassManagerTraits<Method> Implementations
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//
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inline bool PassManagerTraits<Method>::doInitialization(Module *M) {
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bool Changed = false;
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for (unsigned i = 0, e = ((PMType*)this)->Passes.size(); i != e; ++i)
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((PMType*)this)->Passes[i]->doInitialization(M);
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return Changed;
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}
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inline bool PassManagerTraits<Method>::runOnMethod(Method *M) {
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return ((PMType*)this)->runOnUnit(M);
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}
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inline bool PassManagerTraits<Method>::doFinalization(Module *M) {
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bool Changed = false;
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for (unsigned i = 0, e = ((PMType*)this)->Passes.size(); i != e; ++i)
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((PMType*)this)->Passes[i]->doFinalization(M);
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return Changed;
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}
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#endif
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