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//===-- BBLiveVar.h - Live Variable Analysis for a BasicBlock ---*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This is a BasicBlock annotation class that is used by live var analysis to
// hold data flow information for a basic block.
//
//===----------------------------------------------------------------------===//
#ifndef LIVE_VAR_BB_H
#define LIVE_VAR_BB_H
#include "llvm/CodeGen/ValueSet.h"
#include "llvm/ADT/hash_map"
namespace llvm {
class BasicBlock;
class Value;
class MachineBasicBlock;
enum LiveVarDebugLevel_t {
LV_DEBUG_None,
LV_DEBUG_Normal,
LV_DEBUG_Instr,
LV_DEBUG_Verbose
};
extern LiveVarDebugLevel_t DEBUG_LV;
class BBLiveVar {
const BasicBlock &BB; // pointer to BasicBlock
const MachineBasicBlock &MBB; // Pointer to MachineBasicBlock
unsigned POID; // Post-Order ID
ValueSet DefSet; // Def set (with no preceding uses) for LV analysis
ValueSet InSet, OutSet; // In & Out for LV analysis
bool InSetChanged, OutSetChanged; // set if the InSet/OutSet is modified
// map that contains PredBB -> Phi arguments
// coming in on that edge. such uses have to be
// treated differently from ordinary uses.
hash_map<const BasicBlock *, ValueSet> PredToEdgeInSetMap;
// method to propagate an InSet to OutSet of a predecessor
bool setPropagate(ValueSet *OutSetOfPred,
const ValueSet *InSetOfThisBB,
const BasicBlock *PredBB);
// To add an operand which is a def
void addDef(const Value *Op);
// To add an operand which is a use
void addUse(const Value *Op);
void calcDefUseSets(); // calculates the Def & Use sets for this BB
public:
BBLiveVar(const BasicBlock &BB, const MachineBasicBlock &MBB, unsigned POID);
inline bool isInSetChanged() const { return InSetChanged; }
inline bool isOutSetChanged() const { return OutSetChanged; }
const MachineBasicBlock &getMachineBasicBlock() const { return MBB; }
inline unsigned getPOId() const { return POID; }
bool applyTransferFunc(); // calcultes the In in terms of Out
// calculates Out set using In sets of the predecessors
bool applyFlowFunc(hash_map<const BasicBlock*, BBLiveVar*> &BBLiveVarInfo);
inline const ValueSet &getOutSet() const { return OutSet; }
inline ValueSet &getOutSet() { return OutSet; }
inline const ValueSet &getInSet() const { return InSet; }
inline ValueSet &getInSet() { return InSet; }
void printAllSets() const; // for printing Def/In/Out sets
void printInOutSets() const; // for printing In/Out sets
};
} // End llvm namespace
#endif
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