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/* Title: BBLiveVar.h -*- C++ -*-
Author: Ruchira Sasanka
Date: Jun 30, 01
Purpose: This is a wrapper class for BasicBlock which is used by live
variable anaysis.
*/
#ifndef LIVE_VAR_BB_H
#define LIVE_VAR_BB_H
#include "LiveVarSet.h"
#include "LiveVarMap.h"
#include "llvm/BasicBlock.h"
#include "llvm/Instruction.h"
#include "llvm/Type.h"
#include "llvm/iOther.h"
class BBLiveVar
{
const BasicBlock* BaseBB; // pointer to BasicBlock
unsigned int POId; // Post-Order ID
LiveVarSet DefSet; // Def set for LV analysis
LiveVarSet InSet, OutSet; // In & Out for LV analysis
bool InSetChanged, OutSetChanged; // set if the InSet/OutSet is modified
// map that contains phi args->BB they came
// set by calcDefUseSets & used by setPropagate
std::hash_map<const Value *, const BasicBlock *> PhiArgMap;
// method to propogate an InSet to OutSet of a predecessor
bool setPropagate( LiveVarSet *const OutSetOfPred,
const LiveVarSet *const InSetOfThisBB,
const BasicBlock *const 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);
public:
BBLiveVar( const BasicBlock* baseBB, unsigned int POId);
inline bool isInSetChanged() const { return InSetChanged; }
inline bool isOutSetChanged() const { return OutSetChanged; }
inline unsigned int getPOId() const { return POId; }
void calcDefUseSets() ; // calculates the Def & Use sets for this BB
bool applyTransferFunc(); // calcultes the In in terms of Out
// calculates Out set using In sets of the predecessors
bool applyFlowFunc(BBToBBLiveVarMapType LVMap);
inline const LiveVarSet* getOutSet() const { return &OutSet; }
inline const LiveVarSet* getInSet() const { return &InSet; }
void printAllSets() const; // for printing Def/In/Out sets
void printInOutSets() const; // for printing In/Out sets
~BBLiveVar() { } // nothing to do since only composite objects
};
#endif
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