llvm-6502/include/llvm/PassManagers.h

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//===- llvm/PassManager.h - Pass Inftrastructre classes --------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by Devang Patel and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file declares the LLVM Pass Manager infrastructure.
//
//===----------------------------------------------------------------------===//
#include "llvm/PassManager.h"
using namespace llvm;
class llvm::PMDataManager;
class llvm::PMStack;
//===----------------------------------------------------------------------===//
// 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 hierarcy 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 by JIT 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 PMDTopLevelManager
//
// PassManagerImpl is a top level pass manager responsible for managing
// MPPassManagers.
//===----------------------------------------------------------------------===//
namespace llvm {
/// FunctionPassManager and PassManager, two top level managers, serve
/// as the public interface of pass manager infrastructure.
enum TopLevelManagerType {
TLM_Function, // FunctionPassManager
TLM_Pass // PassManager
};
//===----------------------------------------------------------------------===//
// PMTopLevelManager
//
/// PMTopLevelManager manages LastUser info and collects common APIs used by
/// top level pass managers.
class PMTopLevelManager {
public:
virtual unsigned getNumContainedManagers() {
return PassManagers.size();
}
/// 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);
/// This is implemented by top level pass manager and used by
/// schedulePass() to add analysis info passes that are not available.
virtual void addTopLevelPass(Pass *P) = 0;
/// Set pass P as the last user of the given analysis passes.
void setLastUser(std::vector<Pass *> &AnalysisPasses, Pass *P);
/// Collect passes whose last user is P
void collectLastUses(std::vector<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);
PMTopLevelManager(enum TopLevelManagerType t);
virtual ~PMTopLevelManager();
/// Add immutable pass and initialize it.
inline void addImmutablePass(ImmutablePass *P) {
P->initializePass();
ImmutablePasses.push_back(P);
}
inline std::vector<ImmutablePass *>& getImmutablePasses() {
return ImmutablePasses;
}
void addPassManager(Pass *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;
void initializeAllAnalysisInfo();
// Active Pass Managers
PMStack activeStack;
protected:
/// Collection of pass managers
std::vector<Pass *> PassManagers;
private:
/// Collection of pass managers that are not directly maintained
/// by this pass manager
std::vector<PMDataManager *> IndirectPassManagers;
// Map to keep track of last user of the analysis pass.
// LastUser->second is the last user of Lastuser->first.
std::map<Pass *, Pass *> LastUser;
/// Immutable passes are managed by top level manager.
std::vector<ImmutablePass *> ImmutablePasses;
};
//===----------------------------------------------------------------------===//
// PMDataManager
/// PMDataManager provides the common place to manage the analysis data
/// used by pass managers.
class PMDataManager {
public:
PMDataManager(int Depth) : TPM(NULL), Depth(Depth) {
initializeAnalysisInfo();
}
virtual ~PMDataManager();
/// Return true IFF pass P's required analysis set does not required new
/// manager.
bool manageablePass(Pass *P);
/// Augment AvailableAnalysis by adding analysis made available by pass P.
void recordAvailableAnalysis(Pass *P);
/// Remove Analysis that is not preserved by the pass
void removeNotPreservedAnalysis(Pass *P);
/// Remove dead passes
void removeDeadPasses(Pass *P, std::string &Msg);
/// Add pass P into the PassVector. Update
/// AvailableAnalysis appropriately if ProcessAnalysis is true.
void add(Pass *P, bool ProcessAnalysis = true);
/// Initialize available analysis information.
void initializeAnalysisInfo() {
TransferLastUses.clear();
AvailableAnalysis.clear();
}
/// Populate RequiredPasses with the analysis pass that are required by
/// pass P.
void collectRequiredAnalysisPasses(std::vector<Pass *> &RequiredPasses,
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; }
// Print routines used by debug-pass
void dumpLastUses(Pass *P, unsigned Offset) const;
void dumpPassArguments() const;
void dumpPassInfo(Pass *P, std::string &Msg1, std::string &Msg2) const;
void dumpAnalysisSetInfo(const char *Msg, Pass *P,
const std::vector<AnalysisID> &Set) const;
std::vector<Pass *>& getTransferredLastUses() {
return TransferLastUses;
}
virtual unsigned getNumContainedPasses() {
return PassVector.size();
}
virtual PassManagerType getPassManagerType() {
assert ( 0 && "Invalid use of getPassManagerType");
return PMT_Unknown;
}
protected:
// If a FunctionPass F is the last user of ModulePass info M
// then the F's manager, not F, records itself as a last user of M.
// Current pass manage is requesting parent manager to record parent
// manager as the last user of these TrransferLastUses passes.
std::vector<Pass *> TransferLastUses;
// Top level manager.
PMTopLevelManager *TPM;
// Collection of pass that are managed by this manager
std::vector<Pass *> PassVector;
private:
// Set of available Analysis. This information is used while scheduling
// pass. If a pass requires an analysis which is not not available then
// equired analysis pass is scheduled to run before the pass itself is
// scheduled to run.
std::map<AnalysisID, Pass*> AvailableAnalysis;
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:
FPPassManager(int Depth) : PMDataManager(Depth) { }
/// 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);
/// doInitialization - Run all of the initializers for the function passes.
///
bool doInitialization(Module &M);
/// doFinalization - Run all of the initializers for the function passes.
///
bool doFinalization(Module &M);
/// Pass Manager itself does not invalidate any analysis info.
void getAnalysisUsage(AnalysisUsage &Info) const {
Info.setPreservesAll();
}
// Print passes managed by this manager
void dumpPassStructure(unsigned Offset);
FunctionPass *getContainedPass(unsigned N) {
assert ( N < PassVector.size() && "Pass number out of range!");
FunctionPass *FP = static_cast<FunctionPass *>(PassVector[N]);
return FP;
}
virtual PassManagerType getPassManagerType() {
return PMT_FunctionPassManager;
}
};
}