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LocalLiveRangeReducer.cpp
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/*******************************************************************************
* Copyright IBM Corp. and others 2000
*
* This program and the accompanying materials are made available under
* the terms of the Eclipse Public License 2.0 which accompanies this
* distribution and is available at https://www.eclipse.org/legal/epl-2.0/
* or the Apache License, Version 2.0 which accompanies this distribution
* and is available at https://www.apache.org/licenses/LICENSE-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License, v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception [1] and GNU General Public
* License, version 2 with the OpenJDK Assembly Exception [2].
*
* [1] https://www.gnu.org/software/classpath/license.html
* [2] https://openjdk.org/legal/assembly-exception.html
*
* SPDX-License-Identifier: EPL-2.0 OR Apache-2.0 OR GPL-2.0-only WITH Classpath-exception-2.0 OR GPL-2.0-only WITH OpenJDK-assembly-exception-1.0
*******************************************************************************/
#include "optimizer/LocalLiveRangeReducer.hpp"
#include <string.h>
#include "codegen/CodeGenerator.hpp"
#include "env/FrontEnd.hpp"
#include "compile/Compilation.hpp"
#include "compile/SymbolReferenceTable.hpp"
#include "control/Options.hpp"
#include "control/Options_inlines.hpp"
#include "cs2/sparsrbit.h"
#include "env/CompilerEnv.hpp"
#include "il/AliasSetInterface.hpp"
#include "il/Block.hpp"
#include "il/ILOpCodes.hpp"
#include "il/ILOps.hpp"
#include "il/Node.hpp"
#include "il/Node_inlines.hpp"
#include "il/Symbol.hpp"
#include "il/SymbolReference.hpp"
#include "il/TreeTop.hpp"
#include "il/TreeTop_inlines.hpp"
#include "infra/Assert.hpp"
#include "optimizer/Optimization_inlines.hpp"
#include "ras/Debug.hpp"
#if defined(DEBUG) || defined(PROD_WITH_ASSUMES)
#include "env/StackMemoryRegion.hpp"
#endif
#define OPT_DETAILS "O^O LOCAL LIVE RANGE REDUCTION: "
TR_LocalLiveRangeReduction::TR_LocalLiveRangeReduction(TR::OptimizationManager *manager)
: TR::Optimization(manager),
_movedTreesList(trMemory()), _depPairList(trMemory())
{}
void TR_LocalLiveRangeReduction::prePerformOnBlocks()
{
comp()->incVisitCount();
int32_t symRefCount = comp()->getSymRefCount();
_temp = new (trStackMemory()) TR_BitVector(symRefCount, trMemory(), stackAlloc);
}
void TR_LocalLiveRangeReduction::postPerformOnBlocks()
{
comp()->incVisitCount();
}
int32_t TR_LocalLiveRangeReduction::perform()
{
if (comp()->target().cpu.isZ())
return false;
TR::TreeTop * exitTT, * nextTT;
TR::Block *b;
TR::TreeTop * tt;
//calculate number of TreeTops in each bb (or extended bb)
for (tt = comp()->getStartTree(); tt; tt = nextTT)
{
TR::StackMemoryRegion stackMemoryRegion(*trMemory());
TR::Node *node = tt->getNode();
b = node->getBlock();
exitTT = b->getExit();
_numTreeTops = b->getNumberOfRealTreeTops()+2; //include both BBStart/BBend
//support for extended blocks
while ((nextTT = exitTT->getNextTreeTop()) && (b = nextTT->getNode()->getBlock(), b->isExtensionOfPreviousBlock()))
{
_numTreeTops += b->getNumberOfRealTreeTops()+2;
exitTT = b->getExit();
}
_treesRefInfoArray = (TR_TreeRefInfo**)trMemory()->allocateStackMemory(_numTreeTops*sizeof(TR_TreeRefInfo*));
memset(_treesRefInfoArray, 0, _numTreeTops*sizeof(TR_TreeRefInfo*));
_movedTreesList.deleteAll();
_depPairList.deleteAll();
transformExtendedBlock(tt,exitTT->getNextTreeTop());
}
if (trace())
traceMsg(comp(), "\nEnding LocalLiveRangeReducer\n");
return 2;
}
//exitTree is the next treeTop after the relevant range of TreeTops (start of next block)
bool TR_LocalLiveRangeReduction::transformExtendedBlock(TR::TreeTop *entryTree, TR::TreeTop *exitTree)
{
TR::TreeTop *currentTree = exitTree;
if (!performTransformation(comp(), "%sBlock %d\n", OPT_DETAILS, entryTree->getNode()->getBlock()->getNumber()))
return false;
//Gather information for each tree regarding its first/mid/last-ref-nodes.
//And populate list of TreesRefInfo
collectInfo(entryTree, exitTree);
/******************* pass 1 ********************************************/
//Move "interesting trees" down as close as possible to the last ref node.
for (int32_t i =0; i< _numTreeTops; )
{
bool movedFlag=false;
TR_TreeRefInfo *currentTree = _treesRefInfoArray[i];
if (isNeedToBeInvestigated(currentTree))
movedFlag = investigateAndMove(currentTree,1);
if (!movedFlag)
i++;
}
//if none moved return;
if (_movedTreesList.isEmpty())
return true;
//Update DependenciesList after pass 1.
//Remove dependencies which are not of interest (i.e. anchor didn't move).
updateDepList();
//if in all pairs the anchor didn't move, no need for second pass.
if (_depPairList.isEmpty())
return true;
_movedTreesList.deleteAll();
/******************* pass 2 ********************************************/
//Try to move trees that were blcok by a tree that later has been moved.
//Note that since the list adds elements to the head, we can iterate the list, and by this to cover chain of moves (the later one will be in front)
//e.g. if a blocked by b and then b moved after c. The list will be b-c;a-b
ListIterator<DepPair> listIt(&_depPairList);
for (DepPair * depPair = listIt.getFirst(); depPair != NULL; depPair = listIt.getNext())
{
TR_TreeRefInfo *treeToMove = depPair->getDep();
if (isNeedToBeInvestigated(treeToMove))
investigateAndMove(treeToMove,2);
}
return true;
}
//---------------------------- collecting ref info at the beginning -----------------------------------------
void TR_LocalLiveRangeReduction::collectInfo(TR::TreeTop *entryTree,TR::TreeTop *exitTree)
{
TR::TreeTop *currentTree = entryTree;
TR_TreeRefInfo *treeRefInfo;
int32_t i = 0;
int32_t maxRefCount = 0;
vcount_t visitCount = comp()->getVisitCount();
while (!(currentTree == exitTree))
{
treeRefInfo = new (trStackMemory()) TR_TreeRefInfo(currentTree, trMemory());
collectRefInfo(treeRefInfo, currentTree->getNode(),visitCount,&maxRefCount);
_treesRefInfoArray[i++] = treeRefInfo;
initPotentialDeps(treeRefInfo);
treeRefInfo->resetSyms();
populatePotentialDeps(treeRefInfo,treeRefInfo->getTreeTop()->getNode());
currentTree = currentTree->getNextTreeTop();
}
comp()->setVisitCount(visitCount+maxRefCount);
}
void TR_LocalLiveRangeReduction::collectRefInfo(TR_TreeRefInfo *treeRefInfo,TR::Node *node,vcount_t compVisitCount, int32_t *maxRefCount)
{
vcount_t visitCount = node->getVisitCount();
if (node->getReferenceCount() > 1)
{
if (node->getReferenceCount()> unsigned(*maxRefCount))
*maxRefCount = node->getReferenceCount();
if (visitCount >= compVisitCount) //already visited
{
node->incVisitCount() ;
if (visitCount+1 == (compVisitCount+node->getReferenceCount()-1))
treeRefInfo-> getLastRefNodesList()->add(node);
else
treeRefInfo-> getMidRefNodesList()->add(node);
return; //don't recurse on children of => nodes
}
else
{
treeRefInfo->getFirstRefNodesList()->add(node);
node->setVisitCount(compVisitCount);
}
}
for (int32_t i = 0; i < node->getNumChildren(); i++)
{
TR::Node *child = node->getChild(i);
collectRefInfo(treeRefInfo, child, compVisitCount,maxRefCount);
}
}
// ------------------------------- pass 1 ----------------------------------------------------------
bool TR_LocalLiveRangeReduction::investigateAndMove(TR_TreeRefInfo *treeRefInfo,int32_t passNumber)
{
if (isWorthMoving(treeRefInfo)) //worth moving
{
TR_TreeRefInfo *anchor = findLocationToMove(treeRefInfo);
if (!moveTreeBefore(treeRefInfo,anchor,passNumber)) //Move tree before anchor
return false;
if(passNumber==1)
{
_movedTreesList.add(treeRefInfo);
addDepPair(treeRefInfo, anchor); //update Dependencies
}
return true; //moved
}
return false;
}
//
bool TR_LocalLiveRangeReduction::isWorthMoving(TR_TreeRefInfo *tree)
{
bool usesRegisterPairsForLongs = cg()->usesRegisterPairsForLongs();
int32_t numFirstRefNodesFloat=0;
int32_t numFirstRefNodesInt=0;
int32_t numLastRefNodesFloat=0;
int32_t numLastRefNodesInt=0;
TR::Node *node;
//check first references
ListIterator<TR::Node> listIt(tree->getFirstRefNodesList());
for ( node = listIt.getFirst(); node != NULL; node = listIt.getNext())
{
TR::ILOpCode &opCode = node->getOpCode();
if (opCode.isFloatingPoint())
numFirstRefNodesFloat++;
else
{
//all integers, signed and unsined
if (opCode.isLong()&& usesRegisterPairsForLongs)
numFirstRefNodesInt+=2;
else
numFirstRefNodesInt++;
}
}
//check last references
listIt.set(tree->getLastRefNodesList());
for ( node = listIt.getFirst(); node != NULL; node = listIt.getNext())
{
TR::ILOpCode &opCode = node->getOpCode();
if (opCode.isFloatingPoint())
numLastRefNodesFloat++;
else
{
//all integers, signed and unsined
if (opCode.isLong()&& usesRegisterPairsForLongs)
numLastRefNodesInt+=2;
else
numLastRefNodesInt++;
}
}
if (((numLastRefNodesInt < numFirstRefNodesInt) &&
(numLastRefNodesFloat <= numFirstRefNodesFloat)) ||
((numLastRefNodesFloat < numFirstRefNodesFloat) &&
(numLastRefNodesInt <= numFirstRefNodesInt)))
return true;
return false;
}
//Returns the location before which needs to move the tree.
TR_TreeRefInfo * TR_LocalLiveRangeReduction::findLocationToMove(TR_TreeRefInfo *treeToMove)
{
int32_t i = getIndexInArray(treeToMove)+1;
//looping recursivly to find if any tree has a constraint
TR_TreeRefInfo *currentTree;
for (;i<_numTreeTops; i++)
{
currentTree = _treesRefInfoArray[i];
TR::ILOpCode &opCode =currentTree->getTreeTop()->getNode()->getOpCode();
if (opCode.isBranch() || opCode.isReturn() || opCode.isGoto() || opCode.isJumpWithMultipleTargets())
return currentTree;
//support for extended blocks - don't move beyond BBEnd
//note - can be more specific about things that can move across.
if (opCode.getOpCodeValue() == TR::BBEnd)
return currentTree;
if (isAnyDataConstraint(currentTree,treeToMove) ||
isAnySymInDefinedOrUsedBy(currentTree,currentTree->getTreeTop()->getNode(),treeToMove) ||
(matchFirstOrMidToLastRef(currentTree,treeToMove)))
return currentTree;
}
return NULL;
}
void TR_LocalLiveRangeReduction::initPotentialDeps(TR_TreeRefInfo *tree)
{
int32_t symRefCount = comp()->getSymRefCount();
if (tree->getDefSym() == NULL)
tree->setDefSym(new (trStackMemory()) TR_BitVector(symRefCount, trMemory(), stackAlloc));
if (tree->getUseSym() == NULL)
tree->setUseSym(new (trStackMemory()) TR_BitVector(symRefCount, trMemory(), stackAlloc));
}
void TR_LocalLiveRangeReduction::populatePotentialDeps(TR_TreeRefInfo *treeRefInfo,TR::Node *node)
{
TR::ILOpCode &opCode = node->getOpCode();
if (node->getOpCode().hasSymbolReference())
{
TR::SymbolReference *symRef = node->getSymbolReference();
int32_t symRefNum = symRef->getReferenceNumber();
//set defSym - all symbols that might be written
if (opCode.isCall() || opCode.isResolveCheck()|| opCode.isStore() || node->mightHaveNonTransparentSymbolReference())
{
bool isCallDirect = false;
if (node->getOpCode().isCallDirect())
isCallDirect = true;
if (!symRef->getUseDefAliases(isCallDirect).isZero(comp()))
{
TR::SparseBitVector useDefAliases(comp()->allocator());
symRef->getUseDefAliases(isCallDirect).getAliases(useDefAliases);
TR::SparseBitVector::Cursor aliasCursor(useDefAliases);
for (aliasCursor.SetToFirstOne(); aliasCursor.Valid(); aliasCursor.SetToNextOne())
{
int32_t nextAlias = aliasCursor;
treeRefInfo->getDefSym()->set(nextAlias);
}
}
// UseonlyAliases needs to be set up to prevent any store node from being moved
// beyond the node that accesses the same address.
if (!symRef->getUseonlyAliases().isZero(comp()))
{
TR_BitVector *useSym = treeRefInfo->getUseSym();
TR::SparseBitVector useOnlyAliases(comp()->allocator());
symRef->getUseonlyAliases().getAliases(useOnlyAliases);
*useSym |= useOnlyAliases;
}
if (opCode.isStore())
treeRefInfo->getDefSym()->set(symRefNum);
}
//set useSym - all symbols that are used
if (opCode.canRaiseException())
{
TR::SparseBitVector useAliases(comp()->allocator());
symRef->getUseonlyAliases().getAliases(useAliases);
{
TR::SparseBitVector::Cursor aliasesCursor(useAliases);
for (aliasesCursor.SetToFirstOne(); aliasesCursor.Valid(); aliasesCursor.SetToNextOne())
{
int32_t nextAlias = aliasesCursor;
treeRefInfo->getUseSym()->set(nextAlias);
}
}
}
if (opCode.isLoadVar() || (opCode.getOpCodeValue() == TR::loadaddr))
{
treeRefInfo->getUseSym()->set(symRefNum);
}
}
for (int32_t i = 0; i < node->getNumChildren(); i++)
{
TR::Node *child = node->getChild(i);
//don't recurse over references (nodes which are not the first reference)
//
if (child->getReferenceCount()==1 || treeRefInfo->getFirstRefNodesList()->find(child))
populatePotentialDeps(treeRefInfo,child );
}
return;
}
bool TR_LocalLiveRangeReduction::isAnyDataConstraint(TR_TreeRefInfo *currentTreeRefInfo, TR_TreeRefInfo *movingTreeRefInfo )
{
//check if there is a symbol used or written by the moving tree and written by the current
*_temp = *movingTreeRefInfo->getUseSym();
*_temp |= *movingTreeRefInfo->getDefSym();
*_temp &= *currentTreeRefInfo->getDefSym();
if (!_temp->isEmpty())
return true;
//check if there is a symbol written by the moving tree and used by current
*_temp = *movingTreeRefInfo->getDefSym();
*_temp &= *currentTreeRefInfo->getUseSym();
if (!_temp->isEmpty())
return true;
return false;
}
static bool mayBeObjectHeaderStore(TR::Node *node, TR_FrontEnd *fe)
{
node = node->getStoreNode();
TR_ASSERT(fe->getObjectHeaderSizeInBytes() <= TR::Compiler->om.contiguousArrayHeaderSizeInBytes(), "assertion failure");
if (node && node->getSymbol()->getOffset() < TR::Compiler->om.contiguousArrayHeaderSizeInBytes())
return true;
else
return false;
}
static bool nodeMaybeMonitor(TR::Node *node)
{
if ((node->getOpCodeValue() == TR::monent) ||
(node->getOpCodeValue() == TR::monexit) ||
(node->getOpCode().isStore() && node->getSymbol()->holdsMonitoredObject()))
return true;
return false;
}
// Returns true if there is any constraint to the move
bool TR_LocalLiveRangeReduction::isAnySymInDefinedOrUsedBy(TR_TreeRefInfo *currentTreeRefInfo, TR::Node *currentNode, TR_TreeRefInfo *movingTreeRefInfo )
{
TR::Node *movingNode = movingTreeRefInfo->getTreeTop()->getNode();
// ignore anchors
//
if (movingNode->getOpCode().isAnchor())
movingNode = movingNode->getFirstChild();
TR::ILOpCode &opCode = currentNode->getOpCode();
////if ((opCode.getOpCodeValue() == TR::monent) || (opCode.getOpCodeValue() == TR::monexit))
if (nodeMaybeMonitor(currentNode))
{
if (trace())
traceMsg(comp(),"cannot move %p beyond monitor %p\n",movingNode,currentNode);
return true;
}
// Don't move gc points or things across gc points
//
if (movingNode->canGCandReturn() ||
currentNode->canGCandReturn())
{
if (trace())
traceMsg(comp(), "cannot move gc points %p past %p\n", movingNode, currentNode);
return true;
}
// Don't move checks or calls at all
//
if (containsCallOrCheck(movingTreeRefInfo,movingNode))
{
if (trace())
traceMsg(comp(),"cannot move check or call %s\n", getDebug()->getName(movingNode));
return true;
}
// Don't move object header store past a GC point
//
if ((currentNode->getOpCode().isWrtBar() || currentNode->canCauseGC()) && mayBeObjectHeaderStore(movingNode, fe()))
{
if (trace())
traceMsg(comp(),"cannot move possible object header store %s past GC point %s\n", getDebug()->getName(movingNode), getDebug()->getName(currentNode));
return true;
}
if ((comp()->target().cpu.isPower() || comp()->target().cpu.isARM64())
&& opCode.getOpCodeValue() == TR::allocationFence)
{
// Can't move allocations past flushes
if (movingNode->getOpCodeValue() == TR::treetop &&
movingNode->getFirstChild()->getOpCode().isNew() &&
(currentNode->getAllocation() == NULL ||
currentNode->getAllocation() == movingNode->getFirstChild()))
{
if (trace())
{
traceMsg(comp(),"cannot move %p beyond flush %p - ", movingNode, currentNode);
if (currentNode->getAllocation() == NULL)
traceMsg(comp(),"(flush with null allocation)\n");
else
traceMsg(comp(),"(flush for allocation %p)\n", currentNode->getAllocation());
}
return true;
}
// Can't move certain stores past flushes
// Exclude all indirect stores, they may be for stack allocs, in which case the flush is needed at least as a scheduling barrier
// Direct stores to autos and parms are the only safe candidates
if (movingNode->getOpCode().isStoreIndirect() ||
(movingNode->getOpCode().isStoreDirect() && !movingNode->getSymbol()->isParm() && !movingNode->getSymbol()->isAuto()))
{
if (trace())
traceMsg(comp(),"cannot move %p beyond flush %p - (flush for possible stack alloc)", movingNode, currentNode);
return true;
}
}
for (int32_t i = 0; i < currentNode->getNumChildren(); i++)
{
TR::Node *child = currentNode->getChild(i);
//Any node that has side effects (like call and newarrya) cannot be evaluated in the middle of the tree.
if (movingTreeRefInfo->getFirstRefNodesList()->find(child))
{
//for calls and unresolve symbol that are not under check
if (child->exceptionsRaised() ||
(child->getOpCode().hasSymbolReference() && child->getSymbolReference()->isUnresolved()))
{
if (trace())
traceMsg(comp(),"cannot move %p beyond %p - cannot change evaluation point of %p\n ",movingNode,currentTreeRefInfo->getTreeTop()->getNode(),child);
return true;
}
else if(movingNode->getOpCode().isStore())
{
TR::SymbolReference *stSymRef = movingNode->getSymbolReference();
int32_t stSymRefNum = stSymRef->getReferenceNumber();
//TR::SymbolReference *stSymRef = movingNode->getSymbolReference();
int32_t numHelperSymbols = comp()->getSymRefTab()->getNumHelperSymbols();
if ((comp()->getSymRefTab()->isNonHelper(stSymRefNum, TR::SymbolReferenceTable::vftSymbol))||
(comp()->getSymRefTab()->isNonHelper(stSymRefNum, TR::SymbolReferenceTable::contiguousArraySizeSymbol))||
(comp()->getSymRefTab()->isNonHelper(stSymRefNum, TR::SymbolReferenceTable::discontiguousArraySizeSymbol))||
(stSymRef == comp()->getSymRefTab()->findHeaderFlagsSymbolRef())||
(stSymRef->getSymbol() == comp()->getSymRefTab()->findGenericIntShadowSymbol()))
return true;
}
else if (movingNode->getOpCode().isResolveOrNullCheck())
{
if (trace())
traceMsg(comp(),"cannot move %p beyond %p - node %p under ResolveOrNullCheck",movingNode,currentTreeRefInfo->getTreeTop()->getNode(),currentNode);
return true;
}
else if (comp()->target().is64Bit() &&
movingNode->getOpCode().isBndCheck() &&
((opCode.getOpCodeValue() == TR::i2l) || (opCode.getOpCodeValue() == TR::iu2l)) &&
!child->isNonNegative())
{
if (trace())
traceMsg(comp(),"cannot move %p beyond %p - changing the eval point of %p will casue extra cg instruction ",movingNode,currentTreeRefInfo->getTreeTop()->getNode(),currentNode);
return true;
}
}
//don't recurse over nodes each are not the first reference
if (child->getReferenceCount()==1 || currentTreeRefInfo->getFirstRefNodesList()->find(child))
{
if (isAnySymInDefinedOrUsedBy(currentTreeRefInfo, child, movingTreeRefInfo ))
return true;
}
}
return false;
}
bool TR_LocalLiveRangeReduction::moveTreeBefore(TR_TreeRefInfo *treeToMove,TR_TreeRefInfo *anchor,int32_t passNumber)
{
TR::TreeTop *treeToMoveTT = treeToMove->getTreeTop();
TR::TreeTop *anchorTT = anchor->getTreeTop();
if (treeToMoveTT->getNextRealTreeTop() == anchorTT)
{
addDepPair(treeToMove, anchor);
return false;
}
if (!performTransformation(comp(), "%sPass %d: moving tree [%p] before Tree %p\n", OPT_DETAILS, passNumber, treeToMoveTT->getNode(),anchorTT->getNode()))
return false;
// printf("Moving [%p] before Tree %p\n", treeToMoveTT->getNode(),anchorTT->getNode());
//changing location in block
TR::TreeTop *origPrevTree = treeToMoveTT->getPrevTreeTop();
TR::TreeTop *origNextTree = treeToMoveTT->getNextTreeTop();
origPrevTree->setNextTreeTop(origNextTree);
origNextTree->setPrevTreeTop(origPrevTree);
TR::TreeTop *prevTree = anchorTT->getPrevTreeTop();
anchorTT->setPrevTreeTop(treeToMoveTT);
treeToMoveTT->setNextTreeTop(anchorTT);
treeToMoveTT->setPrevTreeTop(prevTree);
prevTree->setNextTreeTop(treeToMoveTT);
//UPDATE REFINFO
//find locations of treeTops in TreeTopsRefInfo array
//startIndex points to the currentTree that has moved
//endIndex points to the treeTop after which we moved the tree (nextTree)
int32_t startIndex = getIndexInArray(treeToMove);
int32_t endIndex = getIndexInArray(anchor)-1;
int32_t i=0;
for ( i = startIndex+1; i<= endIndex ; i++)
{
TR_TreeRefInfo *currentTreeRefInfo = _treesRefInfoArray[i];
List<TR::Node> *firstList = currentTreeRefInfo->getFirstRefNodesList();
List<TR::Node> *midList = currentTreeRefInfo->getMidRefNodesList();
List<TR::Node> *lastList = currentTreeRefInfo->getLastRefNodesList();
List<TR::Node> *M_firstList = treeToMove->getFirstRefNodesList();
List<TR::Node> *M_midList = treeToMove->getMidRefNodesList();
List<TR::Node> *M_lastList = treeToMove->getLastRefNodesList();
if (trace())
{
traceMsg(comp(),"Before move:\n");
printRefInfo(treeToMove);
printRefInfo(currentTreeRefInfo);
}
updateRefInfo(treeToMove->getTreeTop()->getNode(), currentTreeRefInfo, treeToMove , false);
treeToMove->resetSyms();
currentTreeRefInfo->resetSyms();
populatePotentialDeps(currentTreeRefInfo,currentTreeRefInfo->getTreeTop()->getNode());
populatePotentialDeps(treeToMove,treeToMove->getTreeTop()->getNode());
if (trace())
{
traceMsg(comp(),"After move:\n");
printRefInfo(treeToMove);
printRefInfo(currentTreeRefInfo);
traceMsg(comp(),"------------------------\n");
}
}
TR_TreeRefInfo *temp = _treesRefInfoArray[startIndex];
for (i = startIndex; i< endIndex ; i++)
{
_treesRefInfoArray[i] = _treesRefInfoArray[i+1];
}
_treesRefInfoArray[endIndex]=temp;
#if defined(DEBUG) || defined(PROD_WITH_ASSUMES)
if (!(comp()->getOption(TR_EnableParanoidOptCheck) || debug("paranoidOptCheck")))
return true;
//verifier
{
TR::StackMemoryRegion stackMemoryRegion(*trMemory());
vcount_t visitCount = comp()->getVisitCount();
int32_t maxRefCount = 0;
TR::TreeTop *tt;
TR_TreeRefInfo **treesRefInfoArrayTemp = (TR_TreeRefInfo**)trMemory()->allocateStackMemory(_numTreeTops*sizeof(TR_TreeRefInfo*));
memset(treesRefInfoArrayTemp, 0, _numTreeTops*sizeof(TR_TreeRefInfo*));
TR_TreeRefInfo *treeRefInfoTemp;
//collect info
for ( int32_t i = 0; i<_numTreeTops-1; i++)
{
tt =_treesRefInfoArray[i]->getTreeTop();
treeRefInfoTemp = new (trStackMemory()) TR_TreeRefInfo(tt, trMemory());
collectRefInfo(treeRefInfoTemp, tt->getNode(),visitCount,&maxRefCount);
treesRefInfoArrayTemp[i] = treeRefInfoTemp;
}
comp()->setVisitCount(visitCount+maxRefCount);
for ( int32_t i = 0; i<_numTreeTops-1; i++)
{
if (!verifyRefInfo(treesRefInfoArrayTemp[i]->getFirstRefNodesList(),_treesRefInfoArray[i]->getFirstRefNodesList()))
{
printOnVerifyError(_treesRefInfoArray[i],treesRefInfoArrayTemp[i]);
TR_ASSERT(0,"fail to verify firstRefNodesList for %p\n",_treesRefInfoArray[i]->getTreeTop()->getNode());
}
if (!verifyRefInfo(treesRefInfoArrayTemp[i]->getMidRefNodesList(),_treesRefInfoArray[i]->getMidRefNodesList()))
{
printOnVerifyError(_treesRefInfoArray[i],treesRefInfoArrayTemp[i]);
TR_ASSERT(0,"fail to verify midRefNodesList for %p\n",_treesRefInfoArray[i]->getTreeTop()->getNode());
}
if (!verifyRefInfo(treesRefInfoArrayTemp[i]->getLastRefNodesList(),_treesRefInfoArray[i]->getLastRefNodesList()))
{
printOnVerifyError(_treesRefInfoArray[i],treesRefInfoArrayTemp[i]);
TR_ASSERT(0,"fail to verify lastRefNodesList for %p\n",_treesRefInfoArray[i]->getTreeTop()->getNode());
}
}
} // scope of the stack memory region
#endif
return true;
}
//add pair into dependant list
void TR_LocalLiveRangeReduction::addDepPair(TR_TreeRefInfo *dep,TR_TreeRefInfo *anchor)
{
DepPair *depPair = new (trStackMemory()) DepPair(dep,anchor);
_depPairList.add(depPair);
}
void TR_LocalLiveRangeReduction::updateDepList()
{
//at this point we are sure the list is not empty, cause we know some trees as moved.
//first check the head, remove from head as needed
ListElement<DepPair> * leHead=_depPairList.getListHead();
while(leHead && !_movedTreesList.find(leHead->getData()->getAnchor()))
{
_depPairList.popHead();
leHead=_depPairList.getListHead();
}
if (_depPairList.isEmpty())
return;
ListElement<DepPair> * le=leHead;
ListElement<DepPair> * leNext=le->getNextElement();
for (;leNext;)
{
if (!_movedTreesList.find(leNext->getData()->getAnchor()))
_depPairList.removeNext(le);
else
le=leNext;
leNext=le->getNextElement();
}
}
//-------------------------------- helper functions ----------------------------------------------------------
//Test if the tree needs investigation.
//We are only concerned about trees which have children of type Last-Ref-Node.
bool TR_LocalLiveRangeReduction::isNeedToBeInvestigated(TR_TreeRefInfo *treeRefInfo)
{
// TR::TreeTop *treeTop = treeRefInfo->getTreeTop();
TR::Node *node = treeRefInfo->getTreeTop()->getNode();
TR::ILOpCode &opCode = node->getOpCode();
if (opCode.isBranch() || opCode.isReturn() || opCode.isGoto() || opCode.isJumpWithMultipleTargets() ||
opCode.getOpCodeValue() == TR::BBStart || opCode.getOpCodeValue() == TR::BBEnd)
return false;
if (opCode.getOpCodeValue() == TR::treetop || opCode.isResolveOrNullCheck())
node = node->getFirstChild();
//node might have changed
/*if ((node->getOpCodeValue() == TR::monent) ||
(node->getOpCodeValue() == TR::monexit)||
(node->getOpCodeValue() == TR::athrow)) */
if (nodeMaybeMonitor(node) ||(node->getOpCodeValue() == TR::athrow))
return false;
/********************************************************************/
/*Need to add support for this :stop before loadReg to same register*/
if (node->getOpCode().isStoreReg())
return false;
/*******************************************************************/
if (_movedTreesList.find(treeRefInfo))
return false;
if (treeRefInfo->getFirstRefNodesList()->getSize()!=0)
return true;
return false;
}
//returns true if there is first reference of a call or check
bool TR_LocalLiveRangeReduction::containsCallOrCheck(TR_TreeRefInfo *treeRefInfo, TR::Node *node)
{
if ((node->getOpCode().isCall() &&
(node->getReferenceCount()==1 || treeRefInfo->getFirstRefNodesList()->find(node))) ||
node->getOpCode().isCheck())
{
return true;
}
for (int32_t i = 0; i < node->getNumChildren(); i++)
{
TR::Node *child = node->getChild(i);
if (child->getReferenceCount()==1 || treeRefInfo->getFirstRefNodesList()->find(child))
return containsCallOrCheck(treeRefInfo, child);
}
return false;
}
int32_t TR_LocalLiveRangeReduction::getIndexInArray(TR_TreeRefInfo *treeRefInfo)
{
for ( int32_t i = _numTreeTops-1; i>=0; i--)
{
if( treeRefInfo == _treesRefInfoArray[i])
return i;
}
return -1;
}
//When moving trees down, this will tell us where to stop -
//If there are several nodes with "first reference" in the tree to move, stop before the first tree which contain a loast reference to one of those nodes.
bool TR_LocalLiveRangeReduction::matchFirstOrMidToLastRef(TR_TreeRefInfo *tree, TR_TreeRefInfo *treeToMove)
{
ListIterator<TR::Node> listIt(tree->getLastRefNodesList());
for (TR::Node *node = listIt.getFirst(); node != NULL; node = listIt.getNext())
{
TR::Node *node1;
ListIterator<TR::Node> listIt1(treeToMove->getMidRefNodesList());
for (node1 = listIt1.getFirst(); node1 != NULL; node1 = listIt1.getNext())
{
if (node == node1)
return true;
}
listIt1.set(treeToMove->getFirstRefNodesList());
for (node1 = listIt1.getFirst(); node1 != NULL; node1 = listIt1.getNext())
{
if (node == node1)
return true;
}
}
return false;
}
void TR_LocalLiveRangeReduction::updateRefInfo(TR::Node *n, TR_TreeRefInfo *currentTreeRefInfo, TR_TreeRefInfo *movingTreeRefInfo, bool underEval)
{
List<TR::Node> *C_firstList = currentTreeRefInfo->getFirstRefNodesList();
List<TR::Node> *C_midList = currentTreeRefInfo->getMidRefNodesList();
List<TR::Node> *C_lastList = currentTreeRefInfo->getLastRefNodesList();
List<TR::Node> *M_firstList = movingTreeRefInfo->getFirstRefNodesList();
List<TR::Node> *M_midList = movingTreeRefInfo->getMidRefNodesList();
List<TR::Node> *M_lastList = movingTreeRefInfo->getLastRefNodesList();
bool newEval = false;
bool needToRecurse = false;
if (n->getReferenceCount() <=1)
needToRecurse = true;
if (M_firstList->find(n))
{
needToRecurse = true;
if (underEval)
{
M_firstList->remove(n);
C_firstList->add(n);
newEval = true;
if (M_midList->find(n) && C_lastList->find(n) )
{
M_midList->remove(n);
M_lastList->add(n);
C_lastList->remove(n);
C_midList->add(n);
}
}
else if (C_lastList->find(n) )
{
M_firstList->remove(n);
M_lastList->add(n);
C_lastList->remove(n);
C_firstList->add(n);
newEval = true;
}
else if (C_midList->find(n) )
{
M_firstList->remove(n);
M_midList->add(n);
C_midList->remove(n);
C_firstList->add(n);
newEval = true;
}
}
else if (M_midList->find(n))
{
if (C_firstList->find(n) || C_midList->find(n) || C_lastList->find(n))
{
if (underEval)
{
M_midList->remove(n);
C_midList->add(n);
}
if (C_lastList->find(n) && ((underEval && M_midList->find(n)) || !underEval))
{
M_midList->remove(n);
M_lastList->add(n);
C_lastList->remove(n);
C_midList->add(n);
}
}
else if (underEval)
{
if (M_firstList->find(n))
{
M_firstList->remove(n);
C_firstList->add(n);
newEval = true;
}
else
{
M_midList->remove(n);
C_midList->add(n);
}
}
}
else if (M_lastList->find(n) && underEval)
{
if (C_midList->find(n) || C_lastList->find(n)) //caused by prev updates
{
M_lastList->remove(n);
if (M_midList->find(n))
{
M_midList->remove(n);
M_lastList->add(n);
C_midList->add(n);
}
else
C_lastList->add(n);
}
else
{
if (M_firstList->find(n))
{
M_firstList->remove(n);
C_firstList->add(n);
newEval = true;
}
else if (M_midList->find(n))
{
M_midList->remove(n);
C_midList->add(n);
}
else
{
M_lastList->remove(n);
C_lastList->add(n);
}
}
}
else
newEval=underEval;
if (needToRecurse)
{
for (int32_t i = 0; i < n->getNumChildren(); i++)
{
TR::Node *child = n->getChild(i);
if (newEval)
updateRefInfo(child, currentTreeRefInfo, movingTreeRefInfo, true);
else
updateRefInfo(child, currentTreeRefInfo, movingTreeRefInfo, false);
}
}
}
void TR_LocalLiveRangeReduction::printRefInfo(TR_TreeRefInfo *treeRefInfo)
{
if (trace())
{
TR::Node *n;
ListIterator<TR::Node> lit(treeRefInfo->getFirstRefNodesList());
traceMsg(comp(),"[%p]:F={",treeRefInfo->getTreeTop()->getNode());
for (n = lit.getFirst(); n != NULL; n = lit.getNext())
traceMsg(comp(),"%p ",n);