// 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 (TR::Compiler->target.cpu.isPower() && 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 (TR::Compiler->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;
}
