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//===- llvm/PassManagers.h - Pass Infrastructure classes -------*- C++ -*-===//
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// The LLVM Compiler Infrastructure
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//===----------------------------------------------------------------------===//
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// This file declares the LLVM Pass Manager infrastructure.
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_PASSMANAGERS_H
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#define LLVM_PASSMANAGERS_H
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#include "llvm/PassManager.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/ADT/SmallPtrSet.h"
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#include "llvm/ADT/DenseMap.h"
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//===----------------------------------------------------------------------===//
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// The Pass Manager Infrastructure manages passes. It's responsibilities are:
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// o Manage optimization pass execution order
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// o Make required Analysis information available before pass P is run
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// o Release memory occupied by dead passes
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// o If Analysis information is dirtied by a pass then regenerate Analysis
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// information before it is consumed by another pass.
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// Pass Manager Infrastructure uses multiple pass managers. They are
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// PassManager, FunctionPassManager, MPPassManager, FPPassManager, BBPassManager.
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// This class hierarchy uses multiple inheritance but pass managers do not
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// derive from another pass manager.
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// PassManager and FunctionPassManager are two top-level pass manager that
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// represents the external interface of this entire pass manager infrastucture.
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// Important classes :
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// [o] class PMTopLevelManager;
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// Two top level managers, PassManager and FunctionPassManager, derive from
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// PMTopLevelManager. PMTopLevelManager manages information used by top level
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// managers such as last user info.
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// [o] class PMDataManager;
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// PMDataManager manages information, e.g. list of available analysis info,
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// used by a pass manager to manage execution order of passes. It also provides
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// a place to implement common pass manager APIs. All pass managers derive from
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// [o] class BBPassManager : public FunctionPass, public PMDataManager;
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// BBPassManager manages BasicBlockPasses.
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// [o] class FunctionPassManager;
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// This is a external interface used by JIT to manage FunctionPasses. This
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// interface relies on FunctionPassManagerImpl to do all the tasks.
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// [o] class FunctionPassManagerImpl : public ModulePass, PMDataManager,
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// public PMTopLevelManager;
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// FunctionPassManagerImpl is a top level manager. It manages FPPassManagers
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// [o] class FPPassManager : public ModulePass, public PMDataManager;
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// FPPassManager manages FunctionPasses and BBPassManagers
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// [o] class MPPassManager : public Pass, public PMDataManager;
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// MPPassManager manages ModulePasses and FPPassManagers
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// [o] class PassManager;
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// This is a external interface used by various tools to manages passes. It
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// relies on PassManagerImpl to do all the tasks.
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// [o] class PassManagerImpl : public Pass, public PMDataManager,
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// public PMDTopLevelManager
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// PassManagerImpl is a top level pass manager responsible for managing
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//===----------------------------------------------------------------------===//
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#include "llvm/Support/PrettyStackTrace.h"
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/// FunctionPassManager and PassManager, two top level managers, serve
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/// as the public interface of pass manager infrastructure.
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enum TopLevelManagerType {
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TLM_Function, // FunctionPassManager
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TLM_Pass // PassManager
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// enums for debugging strings
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enum PassDebuggingString {
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EXECUTION_MSG, // "Executing Pass '"
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MODIFICATION_MSG, // "' Made Modification '"
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FREEING_MSG, // " Freeing Pass '"
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ON_BASICBLOCK_MSG, // "' on BasicBlock '" + PassName + "'...\n"
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ON_FUNCTION_MSG, // "' on Function '" + FunctionName + "'...\n"
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ON_MODULE_MSG, // "' on Module '" + ModuleName + "'...\n"
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ON_LOOP_MSG, // " 'on Loop ...\n'"
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ON_CG_MSG // "' on Call Graph ...\n'"
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/// PassManagerPrettyStackEntry - This is used to print informative information
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/// about what pass is running when/if a stack trace is generated.
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class PassManagerPrettyStackEntry : public PrettyStackTraceEntry {
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explicit PassManagerPrettyStackEntry(Pass *p)
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: P(p), V(0), M(0) {} // When P is releaseMemory'd.
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PassManagerPrettyStackEntry(Pass *p, Value &v)
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: P(p), V(&v), M(0) {} // When P is run on V
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PassManagerPrettyStackEntry(Pass *p, Module &m)
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: P(p), V(0), M(&m) {} // When P is run on M
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/// print - Emit information about this stack frame to OS.
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virtual void print(raw_ostream &OS) const;
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//===----------------------------------------------------------------------===//
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/// Top level pass managers (see PassManager.cpp) maintain active Pass Managers
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/// using PMStack. Each Pass implements assignPassManager() to connect itself
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/// with appropriate manager. assignPassManager() walks PMStack to find
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/// suitable manager.
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/// PMStack is just a wrapper around standard deque that overrides pop() and
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typedef std::deque<PMDataManager *>::reverse_iterator iterator;
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iterator begin() { return S.rbegin(); }
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iterator end() { return S.rend(); }
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void handleLastUserOverflow();
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inline PMDataManager *top() { return S.back(); }
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void push(PMDataManager *PM);
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inline bool empty() { return S.empty(); }
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std::deque<PMDataManager *> S;
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//===----------------------------------------------------------------------===//
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/// PMTopLevelManager manages LastUser info and collects common APIs used by
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/// top level pass managers.
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class PMTopLevelManager {
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virtual unsigned getNumContainedManagers() const {
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return (unsigned)PassManagers.size();
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/// Schedule pass P for execution. Make sure that passes required by
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/// P are run before P is run. Update analysis info maintained by
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/// the manager. Remove dead passes. This is a recursive function.
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void schedulePass(Pass *P);
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/// This is implemented by top level pass manager and used by
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/// schedulePass() to add analysis info passes that are not available.
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virtual void addTopLevelPass(Pass *P) = 0;
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/// Set pass P as the last user of the given analysis passes.
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void setLastUser(SmallVector<Pass *, 12> &AnalysisPasses, Pass *P);
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/// Collect passes whose last user is P
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void collectLastUses(SmallVector<Pass *, 12> &LastUses, Pass *P);
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/// Find the pass that implements Analysis AID. Search immutable
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/// passes and all pass managers. If desired pass is not found
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/// then return NULL.
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Pass *findAnalysisPass(AnalysisID AID);
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/// Find analysis usage information for the pass P.
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AnalysisUsage *findAnalysisUsage(Pass *P);
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explicit PMTopLevelManager(enum TopLevelManagerType t);
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virtual ~PMTopLevelManager();
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/// Add immutable pass and initialize it.
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inline void addImmutablePass(ImmutablePass *P) {
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ImmutablePasses.push_back(P);
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inline SmallVector<ImmutablePass *, 8>& getImmutablePasses() {
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return ImmutablePasses;
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void addPassManager(PMDataManager *Manager) {
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PassManagers.push_back(Manager);
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// Add Manager into the list of managers that are not directly
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// maintained by this top level pass manager
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inline void addIndirectPassManager(PMDataManager *Manager) {
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IndirectPassManagers.push_back(Manager);
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// Print passes managed by this top level manager.
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void dumpPasses() const;
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void dumpArguments() const;
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void initializeAllAnalysisInfo();
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// Active Pass Managers
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/// Collection of pass managers
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SmallVector<PMDataManager *, 8> PassManagers;
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/// Collection of pass managers that are not directly maintained
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/// by this pass manager
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SmallVector<PMDataManager *, 8> IndirectPassManagers;
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// Map to keep track of last user of the analysis pass.
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// LastUser->second is the last user of Lastuser->first.
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DenseMap<Pass *, Pass *> LastUser;
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// Map to keep track of passes that are last used by a pass.
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// This inverse map is initialized at PM->run() based on
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DenseMap<Pass *, SmallPtrSet<Pass *, 8> > InversedLastUser;
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/// Immutable passes are managed by top level manager.
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SmallVector<ImmutablePass *, 8> ImmutablePasses;
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DenseMap<Pass *, AnalysisUsage *> AnUsageMap;
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//===----------------------------------------------------------------------===//
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/// PMDataManager provides the common place to manage the analysis data
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/// used by pass managers.
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class PMDataManager {
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explicit PMDataManager(int Depth) : TPM(NULL), Depth(Depth) {
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initializeAnalysisInfo();
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virtual ~PMDataManager();
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virtual Pass *getAsPass() = 0;
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/// Augment AvailableAnalysis by adding analysis made available by pass P.
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void recordAvailableAnalysis(Pass *P);
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/// verifyPreservedAnalysis -- Verify analysis presreved by pass P.
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void verifyPreservedAnalysis(Pass *P);
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/// Remove Analysis that is not preserved by the pass
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void removeNotPreservedAnalysis(Pass *P);
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/// Remove dead passes used by P.
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void removeDeadPasses(Pass *P, StringRef Msg,
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enum PassDebuggingString);
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void freePass(Pass *P, StringRef Msg,
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enum PassDebuggingString);
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/// Add pass P into the PassVector. Update
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/// AvailableAnalysis appropriately if ProcessAnalysis is true.
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void add(Pass *P, bool ProcessAnalysis = true);
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/// Add RequiredPass into list of lower level passes required by pass P.
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/// RequiredPass is run on the fly by Pass Manager when P requests it
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/// through getAnalysis interface.
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virtual void addLowerLevelRequiredPass(Pass *P, Pass *RequiredPass);
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virtual Pass * getOnTheFlyPass(Pass *P, const PassInfo *PI, Function &F) {
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assert (0 && "Unable to find on the fly pass");
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/// Initialize available analysis information.
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void initializeAnalysisInfo() {
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AvailableAnalysis.clear();
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for (unsigned i = 0; i < PMT_Last; ++i)
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InheritedAnalysis[i] = NULL;
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// Return true if P preserves high level analysis used by other
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// passes that are managed by this manager.
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bool preserveHigherLevelAnalysis(Pass *P);
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/// Populate RequiredPasses with analysis pass that are required by
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/// pass P and are available. Populate ReqPassNotAvailable with analysis
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/// pass that are required by pass P but are not available.
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void collectRequiredAnalysis(SmallVector<Pass *, 8> &RequiredPasses,
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SmallVector<AnalysisID, 8> &ReqPassNotAvailable,
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/// All Required analyses should be available to the pass as it runs! Here
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/// we fill in the AnalysisImpls member of the pass so that it can
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/// successfully use the getAnalysis() method to retrieve the
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/// implementations it needs.
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void initializeAnalysisImpl(Pass *P);
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/// Find the pass that implements Analysis AID. If desired pass is not found
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/// then return NULL.
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Pass *findAnalysisPass(AnalysisID AID, bool Direction);
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// Access toplevel manager
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PMTopLevelManager *getTopLevelManager() { return TPM; }
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void setTopLevelManager(PMTopLevelManager *T) { TPM = T; }
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unsigned getDepth() const { return Depth; }
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// Print routines used by debug-pass
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void dumpLastUses(Pass *P, unsigned Offset) const;
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void dumpPassArguments() const;
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void dumpPassInfo(Pass *P, enum PassDebuggingString S1,
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enum PassDebuggingString S2, StringRef Msg);
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void dumpRequiredSet(const Pass *P) const;
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void dumpPreservedSet(const Pass *P) const;
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virtual unsigned getNumContainedPasses() const {
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return (unsigned)PassVector.size();
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virtual PassManagerType getPassManagerType() const {
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assert ( 0 && "Invalid use of getPassManagerType");
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std::map<AnalysisID, Pass*> *getAvailableAnalysis() {
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return &AvailableAnalysis;
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// Collect AvailableAnalysis from all the active Pass Managers.
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void populateInheritedAnalysis(PMStack &PMS) {
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for (PMStack::iterator I = PMS.begin(), E = PMS.end();
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InheritedAnalysis[Index++] = (*I)->getAvailableAnalysis();
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// Top level manager.
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PMTopLevelManager *TPM;
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// Collection of pass that are managed by this manager
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SmallVector<Pass *, 16> PassVector;
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// Collection of Analysis provided by Parent pass manager and
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// used by current pass manager. At at time there can not be more
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// then PMT_Last active pass mangers.
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std::map<AnalysisID, Pass *> *InheritedAnalysis[PMT_Last];
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/// isPassDebuggingExecutionsOrMore - Return true if -debug-pass=Executions
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/// or higher is specified.
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bool isPassDebuggingExecutionsOrMore() const;
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void dumpAnalysisUsage(StringRef Msg, const Pass *P,
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const AnalysisUsage::VectorType &Set) const;
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// Set of available Analysis. This information is used while scheduling
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// pass. If a pass requires an analysis which is not available then
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// the required analysis pass is scheduled to run before the pass itself is
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std::map<AnalysisID, Pass*> AvailableAnalysis;
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// Collection of higher level analysis used by the pass managed by
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SmallVector<Pass *, 8> HigherLevelAnalysis;
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//===----------------------------------------------------------------------===//
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/// FPPassManager manages BBPassManagers and FunctionPasses.
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/// It batches all function passes and basic block pass managers together and
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/// sequence them to process one function at a time before processing next
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class FPPassManager : public ModulePass, public PMDataManager {
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explicit FPPassManager(int Depth)
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: ModulePass(&ID), PMDataManager(Depth) { }
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/// run - Execute all of the passes scheduled for execution. Keep track of
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/// whether any of the passes modifies the module, and if so, return true.
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bool runOnFunction(Function &F);
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bool runOnModule(Module &M);
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/// cleanup - After running all passes, clean up pass manager cache.
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/// doInitialization - Run all of the initializers for the function passes.
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bool doInitialization(Module &M);
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/// doFinalization - Run all of the finalizers for the function passes.
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bool doFinalization(Module &M);
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virtual PMDataManager *getAsPMDataManager() { return this; }
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virtual Pass *getAsPass() { return this; }
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/// Pass Manager itself does not invalidate any analysis info.
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void getAnalysisUsage(AnalysisUsage &Info) const {
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Info.setPreservesAll();
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// Print passes managed by this manager
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void dumpPassStructure(unsigned Offset);
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virtual const char *getPassName() const {
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return "Function Pass Manager";
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FunctionPass *getContainedPass(unsigned N) {
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assert ( N < PassVector.size() && "Pass number out of range!");
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FunctionPass *FP = static_cast<FunctionPass *>(PassVector[N]);
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virtual PassManagerType getPassManagerType() const {
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return PMT_FunctionPassManager;
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extern Timer *StartPassTimer(Pass *);
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extern void StopPassTimer(Pass *, Timer *);