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LV code on machine instructions

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@360 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Ruchira Sasanka
2001-08-20 21:12:49 +00:00
parent 9166181257
commit e27c344b56
8 changed files with 528 additions and 294 deletions
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174
lib/Analysis/LiveVar/FunctionLiveVarInfo.cpp
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@@ -1,35 +1,38 @@
/* Title: ValueSet.h
/* Title: MethodLiveVarInfo.cpp
Author: Ruchira Sasanka
Date: Jun 30, 01
Purpose:
This is the interface for live variable info of a method that is required by
any other part of the compiler.
This is the interface for live variable info of a method that is required
by any other part of the compiler.
*/
#include "llvm/Analysis/LiveVar/MethodLiveVarInfo.h"
#include "llvm/CodeGen/MachineInstr.h"
/************************** Constructor/Destructor ***************************/
MethodLiveVarInfo::MethodLiveVarInfo(Method *const MethPtr) : BB2BBLVMap()
{
Meth = MethPtr; // init BB2BBLVMap and records Method for future use
MethodLiveVarInfo::MethodLiveVarInfo(const Method *const M) : Meth(M),
BB2BBLVMap()
{
assert(! M->isExternal() ); // cannot be a prototype decleration
HasAnalyzed = false; // still we haven't called analyze()
}
MethodLiveVarInfo:: ~MethodLiveVarInfo()
{
BBToBBLiveVarMapType::iterator HMI = BB2BBLVMap.begin(); // hash map iterator
// hash map iterator
BBToBBLiveVarMapType::iterator HMI = BB2BBLVMap.begin();
for( ; HMI != BB2BBLVMap.end() ; HMI ++ ) {
if( (*HMI).first ) // delete all LiveVarSets in BB2BBLVMap
if( (*HMI).first ) // delete all LiveVarSets in BB2BBLVMap
delete (*HMI).second;
}
}
@@ -39,38 +42,40 @@ MethodLiveVarInfo:: ~MethodLiveVarInfo()
// constructs BBLiveVars and init Def and In sets
// constructs BBLiveVars and init Def and In sets
void MethodLiveVarInfo::constructBBs()
{
unsigned int POId = 0; // Reverse Depth-first Order ID
unsigned int POId = 0; // Reverse Depth-first Order ID
cfg::po_const_iterator BBI = cfg::po_begin(Meth);
for( ; BBI != cfg::po_end(Meth) ; ++BBI, ++POId)
{
if(DEBUG_LV) cout << "-- For BB " << (*BBI)->getName() << ":" << endl ;
if(DEBUG_LV) cout << " For BB " << (*BBI)->getName() << ":" << endl ;
const BasicBlock *BB = *BBI; // get the current BB
BBLiveVar * LVBB = new BBLiveVar( BB, POId ); // create a new BBLiveVar
const BasicBlock *BB = *BBI; // get the current BB
// create a new BBLiveVar
BBLiveVar * LVBB = new BBLiveVar( BB, POId );
BB2BBLVMap[ BB ] = LVBB; // insert the pair to Map
BB2BBLVMap[ BB ] = LVBB; // insert the pair to Map
LVBB->calcDefUseSets(); // calculates the def and in set
LVBB->calcDefUseSets(); // calculates the def and in set
if(DEBUG_LV) LVBB->printAllSets();
//cout << "InSetChanged: " << LVBB->isInSetChanged() << endl;
if(DEBUG_LV)
LVBB->printAllSets();
}
}
// do one backward pass over the CFG
// do one backward pass over the CFG
bool MethodLiveVarInfo::doSingleBackwardPass()
{
bool ResultFlow, NeedAnotherIteration = false;
if(DEBUG_LV) cout << endl << "------- After Backward Pass --------" << endl;
if(DEBUG_LV)
cout << endl << " After Backward Pass ..." << endl;
cfg::po_const_iterator BBI = cfg::po_begin(Meth);
@@ -80,102 +85,131 @@ bool MethodLiveVarInfo::doSingleBackwardPass()
BBLiveVar* LVBB = BB2BBLVMap[*BBI];
assert( LVBB );
if(DEBUG_LV) cout << "-- For BB " << (*BBI)->getName() << ":" << endl;
if(DEBUG_LV) cout << " For BB " << (*BBI)->getName() << ":" << endl;
// cout << " (POId=" << LVBB->getPOId() << ")" << endl ;
ResultFlow = false;
if( LVBB->isOutSetChanged() )
LVBB->applyTransferFunc(); // apply the Transfer Func to calc the InSet
if( LVBB->isInSetChanged() )
ResultFlow = LVBB->applyFlowFunc( BB2BBLVMap ); // to calc Outsets of preds
LVBB->applyTransferFunc(); // apply the Tran Func to calc InSet
if( LVBB->isInSetChanged() ) // to calc Outsets of preds
ResultFlow = LVBB->applyFlowFunc(BB2BBLVMap);
if(DEBUG_LV) LVBB->printInOutSets();
//cout << "InChanged = " << LVBB->isInSetChanged()
//cout << " UpdatedBBwithLowerPOId = " << ResultFlow << endl;
if( ResultFlow ) NeedAnotherIteration = true;
}
return NeedAnotherIteration; // true if we need to reiterate over the CFG
// true if we need to reiterate over the CFG
return NeedAnotherIteration;
}
void MethodLiveVarInfo::analyze() // performs live var anal for a method
// performs live var anal for a method
void MethodLiveVarInfo::analyze()
{
//cout << "In analyze . . ." << cout;
constructBBs(); // create and initialize all the BBLiveVars of the CFG
if( DEBUG_LV) cout << "Analysing live variables ..." << endl;
// create and initialize all the BBLiveVars of the CFG
constructBBs();
bool NeedAnotherIteration = false;
do {
NeedAnotherIteration = doSingleBackwardPass( ); // do one pass over CFG
} while (NeedAnotherIteration ); // repeat until we need more iterations
do { // do one pass over CFG
NeedAnotherIteration = doSingleBackwardPass( );
} while (NeedAnotherIteration ); // repeat until we need more iterations
HasAnalyzed = true; // finished analysing
if( DEBUG_LV) cout << "Live Variable Analysis complete!" << endl;
}
/* This function will give the LiveVar info for any instruction in a method. It
should be called after a call to analyze().
/* Thsese functions will give the LiveVar info for any machine instruction in
a method. It should be called after a call to analyze().
This function calucluates live var info for all the instructions in a BB,
when LVInfo for one inst is requested. Hence, this function is useful when
live var info is required for many (or all) instructions in a basic block
Also, the arguments to this method does not require specific iterators
Thsese functions calucluates live var info for all the machine instrs in a
BB when LVInfo for one inst is requested. Hence, this function is useful
when live var info is required for many (or all) instructions in a basic
block. Also, the arguments to this method does not require specific
iterators.
*/
const LiveVarSet *
MethodLiveVarInfo::getLiveVarSetBeforeInst(const Instruction *const Inst)
MethodLiveVarInfo::getLiveVarSetBeforeMInst(const MachineInstr *const MInst,
const BasicBlock *const CurBB)
{
// get the BB corresponding to the instruction
const BasicBlock *const CurBB = Inst->getParent();
const LiveVarSet *LVSet = MInst2LVSetBI[MInst];
const LiveVarSet *LVSet = Inst2LVSetMap[Inst];
if( LVSet ) return LVSet; // if found, just return the set
else {
calcLiveVarSetsForBB( CurBB ); // else, calc for all instrs in BB
assert( MInst2LVSetBI[ MInst ] );
return MInst2LVSetBI[ MInst ];
}
}
if( LVSet ) return LVSet; // if found, just return the set
const BasicBlock::InstListType& InstListInBB = CurBB->getInstList();
BasicBlock::InstListType::const_reverse_iterator
InstItEnd= InstListInBB.rend() - 1; // InstItEnd is set to the first instr
const LiveVarSet *
MethodLiveVarInfo::getLiveVarSetAfterMInst(const MachineInstr *const MInst,
const BasicBlock *const CurBB)
{
const LiveVarSet *LVSet = MInst2LVSetAI[MInst];
// LVSet of first instr = InSet
Inst2LVSetMap[*InstItEnd] = getInSetOfBB( CurBB );
if( LVSet ) return LVSet; // if found, just return the set
else {
calcLiveVarSetsForBB( CurBB ); // else, calc for all instrs in BB
assert( MInst2LVSetAI[ MInst ] );
return MInst2LVSetAI[ MInst ];
}
}
// if the first instruction is requested, just return the InSet
if( Inst == *InstItEnd) return Inst2LVSetMap[Inst];
// else calculate for all other instruction in the BB
BasicBlock::InstListType::const_reverse_iterator
InstIt= InstListInBB.rbegin(); // get the iterator for instructions in BB
void MethodLiveVarInfo::calcLiveVarSetsForBB(const BasicBlock *const BB)
{
const MachineCodeForBasicBlock& MIVec = BB->getMachineInstrVec();
MachineCodeForBasicBlock::const_reverse_iterator
MInstIterator = MIVec.rbegin();
LiveVarSet *CurSet = new LiveVarSet();
CurSet->setUnion( getOutSetOfBB( CurBB )); // LVSet now contains the OutSet
const LiveVarSet *SetAI = getOutSetOfBB(BB); // init SetAI with OutSet
CurSet->setUnion(SetAI); // CurSet now contains OutSet
// calculate LVSet for all instructions in the basic block (except the first)
for( ; InstIt != InstItEnd ; InstIt++) {
// iterate over all the machine instructions in BB
for( ; MInstIterator != MIVec.rend(); MInstIterator++) {
CurSet->applyTranferFuncForInst( *InstIt ); // apply the transfer Func
LiveVarSet *NewSet = new LiveVarSet(); // create a new set and
NewSet->setUnion( CurSet ); // copy the set after T/F to it
Inst2LVSetMap[*InstIt] = NewSet; // record that in the map
// MInst is cur machine inst
const MachineInstr * MInst = *MInstIterator;
MInst2LVSetAI[MInst] = SetAI; // record in After Inst map
CurSet->applyTranferFuncForMInst( MInst ); // apply the transfer Func
LiveVarSet *NewSet = new LiveVarSet(); // create a new set and
NewSet->setUnion( CurSet ); // copy the set after T/F to it
MInst2LVSetBI[MInst] = NewSet; // record in Before Inst map
// SetAI will be used in the next iteration
SetAI = NewSet;
}
return Inst2LVSetMap[Inst];
}
/*
NOTES: delete all the LVBBs allocated by adding a destructor to the BB2BBLVMap???
use the dfo_iterator in the doSingleBackwardPass
*/