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+//===- LegacyPassManagers.h - Legacy Pass Infrastructure --------*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file declares the LLVM Pass Manager infrastructure.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_IR_LEGACYPASSMANAGERS_H
+#define LLVM_IR_LEGACYPASSMANAGERS_H
+
+#include "llvm/ADT/DenseMap.h"
+#include "llvm/ADT/FoldingSet.h"
+#include "llvm/ADT/SmallPtrSet.h"
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/Pass.h"
+#include <vector>
+
+//===----------------------------------------------------------------------===//
+// Overview:
+// The Pass Manager Infrastructure manages passes. It's responsibilities are:
+//
+// o Manage optimization pass execution order
+// o Make required Analysis information available before pass P is run
+// o Release memory occupied by dead passes
+// o If Analysis information is dirtied by a pass then regenerate Analysis
+// information before it is consumed by another pass.
+//
+// Pass Manager Infrastructure uses multiple pass managers. They are
+// PassManager, FunctionPassManager, MPPassManager, FPPassManager, BBPassManager.
+// This class hierarchy uses multiple inheritance but pass managers do not
+// derive from another pass manager.
+//
+// PassManager and FunctionPassManager are two top-level pass manager that
+// represents the external interface of this entire pass manager infrastucture.
+//
+// Important classes :
+//
+// [o] class PMTopLevelManager;
+//
+// Two top level managers, PassManager and FunctionPassManager, derive from
+// PMTopLevelManager. PMTopLevelManager manages information used by top level
+// managers such as last user info.
+//
+// [o] class PMDataManager;
+//
+// PMDataManager manages information, e.g. list of available analysis info,
+// used by a pass manager to manage execution order of passes. It also provides
+// a place to implement common pass manager APIs. All pass managers derive from
+// PMDataManager.
+//
+// [o] class BBPassManager : public FunctionPass, public PMDataManager;
+//
+// BBPassManager manages BasicBlockPasses.
+//
+// [o] class FunctionPassManager;
+//
+// This is a external interface used to manage FunctionPasses. This
+// interface relies on FunctionPassManagerImpl to do all the tasks.
+//
+// [o] class FunctionPassManagerImpl : public ModulePass, PMDataManager,
+// public PMTopLevelManager;
+//
+// FunctionPassManagerImpl is a top level manager. It manages FPPassManagers
+//
+// [o] class FPPassManager : public ModulePass, public PMDataManager;
+//
+// FPPassManager manages FunctionPasses and BBPassManagers
+//
+// [o] class MPPassManager : public Pass, public PMDataManager;
+//
+// MPPassManager manages ModulePasses and FPPassManagers
+//
+// [o] class PassManager;
+//
+// This is a external interface used by various tools to manages passes. It
+// relies on PassManagerImpl to do all the tasks.
+//
+// [o] class PassManagerImpl : public Pass, public PMDataManager,
+// public PMTopLevelManager
+//
+// PassManagerImpl is a top level pass manager responsible for managing
+// MPPassManagers.
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Support/PrettyStackTrace.h"
+
+namespace llvm {
+template <typename T> class ArrayRef;
+class Module;
+class Pass;
+class StringRef;
+class Value;
+class Timer;
+class PMDataManager;
+
+// enums for debugging strings
+enum PassDebuggingString {
+ EXECUTION_MSG, // "Executing Pass '" + PassName
+ MODIFICATION_MSG, // "Made Modification '" + PassName
+ FREEING_MSG, // " Freeing Pass '" + PassName
+ ON_BASICBLOCK_MSG, // "' on BasicBlock '" + InstructionName + "'...\n"
+ ON_FUNCTION_MSG, // "' on Function '" + FunctionName + "'...\n"
+ ON_MODULE_MSG, // "' on Module '" + ModuleName + "'...\n"
+ ON_REGION_MSG, // "' on Region '" + Msg + "'...\n'"
+ ON_LOOP_MSG, // "' on Loop '" + Msg + "'...\n'"
+ ON_CG_MSG // "' on Call Graph Nodes '" + Msg + "'...\n'"
+};
+
+/// PassManagerPrettyStackEntry - This is used to print informative information
+/// about what pass is running when/if a stack trace is generated.
+class PassManagerPrettyStackEntry : public PrettyStackTraceEntry {
+ Pass *P;
+ Value *V;
+ Module *M;
+
+public:
+ explicit PassManagerPrettyStackEntry(Pass *p)
+ : P(p), V(nullptr), M(nullptr) {} // When P is releaseMemory'd.
+ PassManagerPrettyStackEntry(Pass *p, Value &v)
+ : P(p), V(&v), M(nullptr) {} // When P is run on V
+ PassManagerPrettyStackEntry(Pass *p, Module &m)
+ : P(p), V(nullptr), M(&m) {} // When P is run on M
+
+ /// print - Emit information about this stack frame to OS.
+ void print(raw_ostream &OS) const override;
+};
+
+//===----------------------------------------------------------------------===//
+// PMStack
+//
+/// PMStack - This class implements a stack data structure of PMDataManager
+/// pointers.
+///
+/// Top level pass managers (see PassManager.cpp) maintain active Pass Managers
+/// using PMStack. Each Pass implements assignPassManager() to connect itself
+/// with appropriate manager. assignPassManager() walks PMStack to find
+/// suitable manager.
+class PMStack {
+public:
+ typedef std::vector<PMDataManager *>::const_reverse_iterator iterator;
+ iterator begin() const { return S.rbegin(); }
+ iterator end() const { return S.rend(); }
+
+ void pop();
+ PMDataManager *top() const { return S.back(); }
+ void push(PMDataManager *PM);
+ bool empty() const { return S.empty(); }
+
+ void dump() const;
+
+private:
+ std::vector<PMDataManager *> S;
+};
+
+//===----------------------------------------------------------------------===//
+// PMTopLevelManager
+//
+/// PMTopLevelManager manages LastUser info and collects common APIs used by
+/// top level pass managers.
+class PMTopLevelManager {
+protected:
+ explicit PMTopLevelManager(PMDataManager *PMDM);
+
+ unsigned getNumContainedManagers() const {
+ return (unsigned)PassManagers.size();
+ }
+
+ void initializeAllAnalysisInfo();
+
+private:
+ virtual PMDataManager *getAsPMDataManager() = 0;
+ virtual PassManagerType getTopLevelPassManagerType() = 0;
+
+public:
+ /// Schedule pass P for execution. Make sure that passes required by
+ /// P are run before P is run. Update analysis info maintained by
+ /// the manager. Remove dead passes. This is a recursive function.
+ void schedulePass(Pass *P);
+
+ /// Set pass P as the last user of the given analysis passes.
+ void setLastUser(ArrayRef<Pass*> AnalysisPasses, Pass *P);
+
+ /// Collect passes whose last user is P
+ void collectLastUses(SmallVectorImpl<Pass *> &LastUses, Pass *P);
+
+ /// Find the pass that implements Analysis AID. Search immutable
+ /// passes and all pass managers. If desired pass is not found
+ /// then return NULL.
+ Pass *findAnalysisPass(AnalysisID AID);
+
+ /// Retrieve the PassInfo for an analysis.
+ const PassInfo *findAnalysisPassInfo(AnalysisID AID) const;
+
+ /// Find analysis usage information for the pass P.
+ AnalysisUsage *findAnalysisUsage(Pass *P);
+
+ virtual ~PMTopLevelManager();
+
+ /// Add immutable pass and initialize it.
+ void addImmutablePass(ImmutablePass *P);
+
+ inline SmallVectorImpl<ImmutablePass *>& getImmutablePasses() {
+ return ImmutablePasses;
+ }
+
+ void addPassManager(PMDataManager *Manager) {
+ PassManagers.push_back(Manager);
+ }
+
+ // Add Manager into the list of managers that are not directly
+ // maintained by this top level pass manager
+ inline void addIndirectPassManager(PMDataManager *Manager) {
+ IndirectPassManagers.push_back(Manager);
+ }
+
+ // Print passes managed by this top level manager.
+ void dumpPasses() const;
+ void dumpArguments() const;
+
+ // Active Pass Managers
+ PMStack activeStack;
+
+protected:
+ /// Collection of pass managers
+ SmallVector<PMDataManager *, 8> PassManagers;
+
+private:
+ /// Collection of pass managers that are not directly maintained
+ /// by this pass manager
+ SmallVector<PMDataManager *, 8> IndirectPassManagers;
+
+ // Map to keep track of last user of the analysis pass.
+ // LastUser->second is the last user of Lastuser->first.
+ DenseMap<Pass *, Pass *> LastUser;
+
+ // Map to keep track of passes that are last used by a pass.
+ // This inverse map is initialized at PM->run() based on
+ // LastUser map.
+ DenseMap<Pass *, SmallPtrSet<Pass *, 8> > InversedLastUser;
+
+ /// Immutable passes are managed by top level manager.
+ SmallVector<ImmutablePass *, 16> ImmutablePasses;
+
+ /// Map from ID to immutable passes.
+ SmallDenseMap<AnalysisID, ImmutablePass *, 8> ImmutablePassMap;
+
+
+ /// A wrapper around AnalysisUsage for the purpose of uniqueing. The wrapper
+ /// is used to avoid needing to make AnalysisUsage itself a folding set node.
+ struct AUFoldingSetNode : public FoldingSetNode {
+ AnalysisUsage AU;
+ AUFoldingSetNode(const AnalysisUsage &AU) : AU(AU) {}
+ void Profile(FoldingSetNodeID &ID) const {
+ Profile(ID, AU);
+ }
+ static void Profile(FoldingSetNodeID &ID, const AnalysisUsage &AU) {
+ // TODO: We could consider sorting the dependency arrays within the
+ // AnalysisUsage (since they are conceptually unordered).
+ ID.AddBoolean(AU.getPreservesAll());
+ auto ProfileVec = [&](const SmallVectorImpl<AnalysisID>& Vec) {
+ ID.AddInteger(Vec.size());
+ for(AnalysisID AID : Vec)
+ ID.AddPointer(AID);
+ };
+ ProfileVec(AU.getRequiredSet());
+ ProfileVec(AU.getRequiredTransitiveSet());
+ ProfileVec(AU.getPreservedSet());
+ ProfileVec(AU.getUsedSet());
+ }
+ };
+
+ // Contains all of the unique combinations of AnalysisUsage. This is helpful
+ // when we have multiple instances of the same pass since they'll usually
+ // have the same analysis usage and can share storage.
+ FoldingSet<AUFoldingSetNode> UniqueAnalysisUsages;
+
+ // Allocator used for allocating UAFoldingSetNodes. This handles deletion of
+ // all allocated nodes in one fell swoop.
+ SpecificBumpPtrAllocator<AUFoldingSetNode> AUFoldingSetNodeAllocator;
+
+ // Maps from a pass to it's associated entry in UniqueAnalysisUsages. Does
+ // not own the storage associated with either key or value..
+ DenseMap<Pass *, AnalysisUsage*> AnUsageMap;
+
+ /// Collection of PassInfo objects found via analysis IDs and in this top
+ /// level manager. This is used to memoize queries to the pass registry.
+ /// FIXME: This is an egregious hack because querying the pass registry is
+ /// either slow or racy.
+ mutable DenseMap<AnalysisID, const PassInfo *> AnalysisPassInfos;
+};
+
+//===----------------------------------------------------------------------===//
+// PMDataManager
+
+/// PMDataManager provides the common place to manage the analysis data
+/// used by pass managers.
+class PMDataManager {
+public:
+ explicit PMDataManager() : TPM(nullptr), Depth(0) {
+ initializeAnalysisInfo();
+ }
+
+ virtual ~PMDataManager();
+
+ virtual Pass *getAsPass() = 0;
+
+ /// Augment AvailableAnalysis by adding analysis made available by pass P.
+ void recordAvailableAnalysis(Pass *P);
+
+ /// verifyPreservedAnalysis -- Verify analysis presreved by pass P.
+ void verifyPreservedAnalysis(Pass *P);
+
+ /// Remove Analysis that is not preserved by the pass
+ void removeNotPreservedAnalysis(Pass *P);
+
+ /// Remove dead passes used by P.
+ void removeDeadPasses(Pass *P, StringRef Msg,
+ enum PassDebuggingString);
+
+ /// Remove P.
+ void freePass(Pass *P, StringRef Msg,
+ enum PassDebuggingString);
+
+ /// Add pass P into the PassVector. Update
+ /// AvailableAnalysis appropriately if ProcessAnalysis is true.
+ void add(Pass *P, bool ProcessAnalysis = true);
+
+ /// Add RequiredPass into list of lower level passes required by pass P.
+ /// RequiredPass is run on the fly by Pass Manager when P requests it
+ /// through getAnalysis interface.
+ virtual void addLowerLevelRequiredPass(Pass *P, Pass *RequiredPass);
+
+ virtual Pass *getOnTheFlyPass(Pass *P, AnalysisID PI, Function &F);
+
+ /// Initialize available analysis information.
+ void initializeAnalysisInfo() {
+ AvailableAnalysis.clear();
+ for (unsigned i = 0; i < PMT_Last; ++i)
+ InheritedAnalysis[i] = nullptr;
+ }
+
+ // Return true if P preserves high level analysis used by other
+ // passes that are managed by this manager.
+ bool preserveHigherLevelAnalysis(Pass *P);
+
+ /// Populate UsedPasses with analysis pass that are used or required by pass
+ /// P and are available. Populate ReqPassNotAvailable with analysis pass that
+ /// are required by pass P but are not available.
+ void collectRequiredAndUsedAnalyses(
+ SmallVectorImpl<Pass *> &UsedPasses,
+ SmallVectorImpl<AnalysisID> &ReqPassNotAvailable, Pass *P);
+
+ /// All Required analyses should be available to the pass as it runs! Here
+ /// we fill in the AnalysisImpls member of the pass so that it can
+ /// successfully use the getAnalysis() method to retrieve the
+ /// implementations it needs.
+ void initializeAnalysisImpl(Pass *P);
+
+ /// Find the pass that implements Analysis AID. If desired pass is not found
+ /// then return NULL.
+ Pass *findAnalysisPass(AnalysisID AID, bool Direction);
+
+ // Access toplevel manager
+ PMTopLevelManager *getTopLevelManager() { return TPM; }
+ void setTopLevelManager(PMTopLevelManager *T) { TPM = T; }
+
+ unsigned getDepth() const { return Depth; }
+ void setDepth(unsigned newDepth) { Depth = newDepth; }
+
+ // Print routines used by debug-pass
+ void dumpLastUses(Pass *P, unsigned Offset) const;
+ void dumpPassArguments() const;
+ void dumpPassInfo(Pass *P, enum PassDebuggingString S1,
+ enum PassDebuggingString S2, StringRef Msg);
+ void dumpRequiredSet(const Pass *P) const;
+ void dumpPreservedSet(const Pass *P) const;
+ void dumpUsedSet(const Pass *P) const;
+
+ unsigned getNumContainedPasses() const {
+ return (unsigned)PassVector.size();
+ }
+
+ virtual PassManagerType getPassManagerType() const {
+ assert ( 0 && "Invalid use of getPassManagerType");
+ return PMT_Unknown;
+ }
+
+ DenseMap<AnalysisID, Pass*> *getAvailableAnalysis() {
+ return &AvailableAnalysis;
+ }
+
+ // Collect AvailableAnalysis from all the active Pass Managers.
+ void populateInheritedAnalysis(PMStack &PMS) {
+ unsigned Index = 0;
+ for (PMStack::iterator I = PMS.begin(), E = PMS.end();
+ I != E; ++I)
+ InheritedAnalysis[Index++] = (*I)->getAvailableAnalysis();
+ }
+
+protected:
+ // Top level manager.
+ PMTopLevelManager *TPM;
+
+ // Collection of pass that are managed by this manager
+ SmallVector<Pass *, 16> PassVector;
+
+ // Collection of Analysis provided by Parent pass manager and
+ // used by current pass manager. At at time there can not be more
+ // then PMT_Last active pass mangers.
+ DenseMap<AnalysisID, Pass *> *InheritedAnalysis[PMT_Last];
+
+ /// isPassDebuggingExecutionsOrMore - Return true if -debug-pass=Executions
+ /// or higher is specified.
+ bool isPassDebuggingExecutionsOrMore() const;
+
+private:
+ void dumpAnalysisUsage(StringRef Msg, const Pass *P,
+ const AnalysisUsage::VectorType &Set) const;
+
+ // Set of available Analysis. This information is used while scheduling
+ // pass. If a pass requires an analysis which is not available then
+ // the required analysis pass is scheduled to run before the pass itself is
+ // scheduled to run.
+ DenseMap<AnalysisID, Pass*> AvailableAnalysis;
+
+ // Collection of higher level analysis used by the pass managed by
+ // this manager.
+ SmallVector<Pass *, 16> HigherLevelAnalysis;
+
+ unsigned Depth;
+};
+
+//===----------------------------------------------------------------------===//
+// FPPassManager
+//
+/// FPPassManager manages BBPassManagers and FunctionPasses.
+/// It batches all function passes and basic block pass managers together and
+/// sequence them to process one function at a time before processing next
+/// function.
+class FPPassManager : public ModulePass, public PMDataManager {
+public:
+ static char ID;
+ explicit FPPassManager()
+ : ModulePass(ID), PMDataManager() { }
+
+ /// run - Execute all of the passes scheduled for execution. Keep track of
+ /// whether any of the passes modifies the module, and if so, return true.
+ bool runOnFunction(Function &F);
+ bool runOnModule(Module &M) override;
+
+ /// cleanup - After running all passes, clean up pass manager cache.
+ void cleanup();
+
+ /// doInitialization - Overrides ModulePass doInitialization for global
+ /// initialization tasks
+ ///
+ using ModulePass::doInitialization;
+
+ /// doInitialization - Run all of the initializers for the function passes.
+ ///
+ bool doInitialization(Module &M) override;
+
+ /// doFinalization - Overrides ModulePass doFinalization for global
+ /// finalization tasks
+ ///
+ using ModulePass::doFinalization;
+
+ /// doFinalization - Run all of the finalizers for the function passes.
+ ///
+ bool doFinalization(Module &M) override;
+
+ PMDataManager *getAsPMDataManager() override { return this; }
+ Pass *getAsPass() override { return this; }
+
+ /// Pass Manager itself does not invalidate any analysis info.
+ void getAnalysisUsage(AnalysisUsage &Info) const override {
+ Info.setPreservesAll();
+ }
+
+ // Print passes managed by this manager
+ void dumpPassStructure(unsigned Offset) override;
+
+ StringRef getPassName() const override { return "Function Pass Manager"; }
+
+ FunctionPass *getContainedPass(unsigned N) {
+ assert ( N < PassVector.size() && "Pass number out of range!");
+ FunctionPass *FP = static_cast<FunctionPass *>(PassVector[N]);
+ return FP;
+ }
+
+ PassManagerType getPassManagerType() const override {
+ return PMT_FunctionPassManager;
+ }
+};
+
+Timer *getPassTimer(Pass *);
+}
+
+#endif