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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@291 91177308-0d34-0410-b5e6-96231b3b80d8
190 lines
5.3 KiB
C++
190 lines
5.3 KiB
C++
/* Title: ValueSet.h
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Author: Ruchira Sasanka
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Date: Jun 30, 01
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Purpose:
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This is the interface for live variable info of a method that is required by
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any other part of the compiler.
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*/
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#include "llvm/Analysis/LiveVar/MethodLiveVarInfo.h"
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/************************** Constructor/Destructor ***************************/
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MethodLiveVarInfo::MethodLiveVarInfo(Method *const MethPtr) : BB2BBLVMap()
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{
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Meth = MethPtr; // init BB2BBLVMap and records Method for future use
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}
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MethodLiveVarInfo:: ~MethodLiveVarInfo()
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{
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BBToBBLiveVarMapType::iterator HMI = BB2BBLVMap.begin(); // hash map iterator
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for( ; HMI != BB2BBLVMap.end() ; HMI ++ ) {
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if( (*HMI).first ) // delete all LiveVarSets in BB2BBLVMap
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delete (*HMI).second;
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}
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}
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// -------------------------- support functions -------------------------------
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// constructs BBLiveVars and init Def and In sets
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void MethodLiveVarInfo::constructBBs()
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{
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unsigned int POId = 0; // Reverse Depth-first Order ID
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cfg::po_const_iterator BBI = cfg::po_begin(Meth);
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for( ; BBI != cfg::po_end(Meth) ; ++BBI, ++POId)
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{
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if(DEBUG_LV) cout << "-- For BB " << (*BBI)->getName() << ":" << endl ;
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const BasicBlock *BB = *BBI; // get the current BB
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BBLiveVar * LVBB = new BBLiveVar( BB, POId ); // create a new BBLiveVar
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BB2BBLVMap[ BB ] = LVBB; // insert the pair to Map
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LVBB->calcDefUseSets(); // calculates the def and in set
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if(DEBUG_LV) LVBB->printAllSets();
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//cout << "InSetChanged: " << LVBB->isInSetChanged() << endl;
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}
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}
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// do one backward pass over the CFG
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bool MethodLiveVarInfo::doSingleBackwardPass()
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{
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bool ResultFlow, NeedAnotherIteration = false;
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if(DEBUG_LV) cout << endl << "------- After Backward Pass --------" << endl;
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cfg::po_const_iterator BBI = cfg::po_begin(Meth);
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for( ; BBI != cfg::po_end(Meth) ; ++BBI)
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{
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BBLiveVar* LVBB = BB2BBLVMap[*BBI];
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assert( LVBB );
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if(DEBUG_LV) cout << "-- For BB " << (*BBI)->getName() << ":" << endl;
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// cout << " (POId=" << LVBB->getPOId() << ")" << endl ;
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ResultFlow = false;
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if( LVBB->isOutSetChanged() )
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LVBB->applyTransferFunc(); // apply the Transfer Func to calc the InSet
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if( LVBB->isInSetChanged() )
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ResultFlow = LVBB->applyFlowFunc( BB2BBLVMap ); // to calc Outsets of preds
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if(DEBUG_LV) LVBB->printInOutSets();
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//cout << "InChanged = " << LVBB->isInSetChanged()
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//cout << " UpdatedBBwithLowerPOId = " << ResultFlow << endl;
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if( ResultFlow ) NeedAnotherIteration = true;
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}
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return NeedAnotherIteration; // true if we need to reiterate over the CFG
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}
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void MethodLiveVarInfo::analyze() // performs live var anal for a method
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{
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//cout << "In analyze . . ." << cout;
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constructBBs(); // create and initialize all the BBLiveVars of the CFG
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bool NeedAnotherIteration = false;
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do {
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NeedAnotherIteration = doSingleBackwardPass( ); // do one pass over CFG
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} while (NeedAnotherIteration ); // repeat until we need more iterations
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}
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/* This function will give the LiveVar info for any instruction in a method. It
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should be called after a call to analyze().
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This function calucluates live var info for all the instructions in a BB,
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when LVInfo for one inst is requested. Hence, this function is useful when
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live var info is required for many (or all) instructions in a basic block
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Also, the arguments to this method does not require specific iterators
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*/
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const LiveVarSet *
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MethodLiveVarInfo::getLiveVarSetBeforeInst(const Instruction *const Inst)
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{
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// get the BB corresponding to the instruction
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const BasicBlock *const CurBB = Inst->getParent();
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const LiveVarSet *LVSet = Inst2LVSetMap[Inst];
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if( LVSet ) return LVSet; // if found, just return the set
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const BasicBlock::InstListType& InstListInBB = CurBB->getInstList();
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BasicBlock::InstListType::const_reverse_iterator
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InstItEnd= InstListInBB.rend() - 1; // InstItEnd is set to the first instr
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// LVSet of first instr = InSet
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Inst2LVSetMap[*InstItEnd] = getInSetOfBB( CurBB );
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// if the first instruction is requested, just return the InSet
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if( Inst == *InstItEnd) return Inst2LVSetMap[Inst];
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// else calculate for all other instruction in the BB
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BasicBlock::InstListType::const_reverse_iterator
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InstIt= InstListInBB.rbegin(); // get the iterator for instructions in BB
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LiveVarSet *CurSet = new LiveVarSet();
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CurSet->setUnion( getOutSetOfBB( CurBB )); // LVSet now contains the OutSet
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// calculate LVSet for all instructions in the basic block (except the first)
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for( ; InstIt != InstItEnd ; InstIt++) {
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CurSet->applyTranferFuncForInst( *InstIt ); // apply the transfer Func
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LiveVarSet *NewSet = new LiveVarSet(); // create a new set and
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NewSet->setUnion( CurSet ); // copy the set after T/F to it
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Inst2LVSetMap[*InstIt] = NewSet; // record that in the map
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}
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return Inst2LVSetMap[Inst];
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}
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/*
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NOTES: delete all the LVBBs allocated by adding a destructor to the BB2BBLVMap???
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use the dfo_iterator in the doSingleBackwardPass
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*/
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