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ValuePropagationCommon.cpp
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ValuePropagationCommon.cpp
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/*******************************************************************************
* Copyright (c) 2000, 2021 IBM Corp. and others
*
* 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 http://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] http://openjdk.java.net/legal/assembly-exception.html
*
* SPDX-License-Identifier: EPL-2.0 OR Apache-2.0 OR GPL-2.0 WITH Classpath-exception-2.0 OR LicenseRef-GPL-2.0 WITH Assembly-exception
*******************************************************************************/
// ***************************************************************************
//
// TODO - float and double constants
//
// ***************************************************************************
#include <stddef.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include "codegen/CodeGenerator.hpp"
#include "env/FrontEnd.hpp"
#include "codegen/RecognizedMethods.hpp"
#include "compile/Compilation.hpp"
#include "compile/Method.hpp"
#include "compile/ResolvedMethod.hpp"
#include "compile/SymbolReferenceTable.hpp"
#include "control/Options.hpp"
#include "control/Options_inlines.hpp"
#include "control/Recompilation.hpp"
#include "cs2/hashtab.h"
#include "env/CompilerEnv.hpp"
#include "env/ObjectModel.hpp"
#include "env/TRMemory.hpp"
#include "env/jittypes.h"
#include "optimizer/TransformUtil.hpp"
#include "il/Block.hpp"
#include "il/DataTypes.hpp"
#include "il/ILOpCodes.hpp"
#include "il/ILOps.hpp"
#include "il/MethodSymbol.hpp"
#include "il/Node.hpp"
#include "il/Node_inlines.hpp"
#include "il/ParameterSymbol.hpp"
#include "il/ResolvedMethodSymbol.hpp"
#include "il/StaticSymbol.hpp"
#include "il/Symbol.hpp"
#include "il/SymbolReference.hpp"
#include "il/TreeTop.hpp"
#include "il/TreeTop_inlines.hpp"
#include "infra/Array.hpp"
#include "infra/Assert.hpp"
#include "infra/BitVector.hpp"
#include "infra/Cfg.hpp"
#include "infra/Link.hpp"
#include "infra/List.hpp"
#include "infra/Stack.hpp"
#include "infra/Statistics.hpp"
#include "infra/CfgEdge.hpp"
#include "infra/Timer.hpp"
#include "optimizer/Inliner.hpp"
#include "optimizer/Optimization.hpp"
#include "optimizer/Optimization_inlines.hpp"
#include "optimizer/Optimizations.hpp"
#include "optimizer/Optimizer.hpp"
#include "optimizer/Structure.hpp"
#include "optimizer/TransformUtil.hpp"
#include "optimizer/UseDefInfo.hpp"
#include "optimizer/ValueNumberInfo.hpp"
#include "optimizer/VPConstraint.hpp"
#include "optimizer/ValuePropagation.hpp"
#include "optimizer/LocalValuePropagation.hpp"
#include "ras/Debug.hpp"
#include "ras/DebugCounter.hpp"
#include "env/IO.hpp"
#ifdef J9_PROJECT_SPECIFIC
#include "env/VMJ9.h"
#include "optimizer/IdiomRecognitionUtils.hpp"
#endif
namespace TR { class CFGNode; }
namespace TR { class OptimizationManager; }
#define OPT_DETAILS "O^O VALUE PROPAGATION: "
#define NEED_WRITE_BARRIER 1
#define NEED_ARRAYSTORE_CHECK 2
#define NEED_ARRAYSTORE_CHECK_AND_WRITE_BARRIER 3
#define FORWARD_ARRAYCOPY 4
#define NEED_RUNTIME_TEST_FOR_SRC 8
#define NEED_RUNTIME_TEST_FOR_DST 16
#define MAX_RELATION_DEPTH 30
extern void collectArraylengthNodes(TR::Node *node, vcount_t visitCount, List<TR::Node> *arraylengthNodes);
// ***************************************************************************
//
// Methods of Value Propagation optimization
//
// ***************************************************************************
OMR::ValuePropagation::ValuePropagation(TR::OptimizationManager *manager)
: TR::Optimization(manager),
_parmValues(NULL),
_currentParent(NULL),
_arraylengthNodes(trMemory()),
_javaLangClassGetComponentTypeCalls(trMemory()),
_unknownTypeArrayCopyTrees(trMemory()),
_scalarizedArrayCopies(trMemory()),
_predictedThrows(trMemory()),
_prexClasses(trMemory()),
_prexMethods(trMemory()),
_prexClassesThatShouldNotBeNewlyExtended(trMemory()),
_resetClassesThatShouldNotBeNewlyExtended(trMemory()),
_referenceArrayCopyTrees(trMemory()),
_needRunTimeCheckArrayCopy(trMemory()),
_needMultiLeafArrayCopy(trMemory()),
_arrayCopySpineCheck(trMemory()),
_multiLeafCallsToInline(trMemory()),
_converterCalls(trMemory()),
_objectCloneCalls(trMemory()),
_arrayCloneCalls(trMemory()),
_objectCloneTypes(trMemory()),
_arrayCloneTypes(trMemory()),
_parmInfo(NULL),
_parmTypeValid(NULL),
_constNodeInfo(comp()->allocator())
{
// DANGER !!!
// Virtual methods on ValuePropagation should only be called when the most derived class of VP's
// constructor is completed for correct behavior.
// setVP does not call any virtual method on VP, so it's ok to be here.
_vcHandler.setVP(this);
}
void OMR::ValuePropagation::initialize()
{
_resetClassesThatShouldNotBeNewlyExtended.deleteAll();
_enableVersionBlocks = false;
_disableVersionBlockForThisBlock = true;
_nullObjectConstraint = new (trStackMemory()) TR::VPNullObject();
_nonNullObjectConstraint = new (trStackMemory()) TR::VPNonNullObject();
_preexistentObjectConstraint = new (trStackMemory()) TR::VPPreexistentObject();
_constantZeroConstraint = new (trStackMemory()) TR::VPIntConst(0);
_unreachablePathConstraint = new (trStackMemory()) TR::VPUnreachablePath();
_invalidateUseDefInfo = false;
_invalidateValueNumberInfo = false;
_enableSimplifier = false;
_checksRemoved = false;
_usePreexistence = false;
_chTableWasValid = true;
_chTableValidityChecked = false;
_changedThis = TR_maybe;
_constraintsHashTable = (ConstraintsHashTableEntry**)trMemory()->allocateStackMemory(VP_HASH_TABLE_SIZE*sizeof(ConstraintsHashTableEntry*));
memset(_constraintsHashTable, 0, VP_HASH_TABLE_SIZE*sizeof(ConstraintsHashTableEntry*));
// determine if there are any invariant parms
//
int32_t numParms = comp()->getMethodSymbol()->getParameterList().getSize();
_parmInfo = (int32_t *) trMemory()->allocateStackMemory(numParms * sizeof(int32_t));
_parmTypeValid = (bool *) trMemory()->allocateStackMemory(numParms * sizeof(bool));
// mark all parms as invariant (0) to begin with
//
memset(_parmInfo, 0, numParms * sizeof(int32_t));
// mark info to be true
for (int32_t i = 0; i < numParms; i++)
_parmTypeValid[i] = true;
for (TR::TreeTop *tt = comp()->getStartTree();
tt;
tt = tt->getNextTreeTop())
{
TR::Node *node = tt->getNode();
if (node && node->getOpCodeValue() == TR::treetop)
node = node->getFirstChild();
if (node && node->getOpCode().isStoreDirect())
{
TR::Symbol *sym = node->getSymbolReference()->getSymbol();
if (sym->isParm())
{
// parm is no longer invariant
//
int32_t index = sym->getParmSymbol()->getOrdinal();
_parmInfo[index] = 1;
}
}
}
_arraylengthNodes.deleteAll();
vcount_t visitCount = comp()->incVisitCount();
TR::TreeTop *curTree = comp()->getStartTree();
while (curTree)
{
if (curTree->getNode()) collectArraylengthNodes(curTree->getNode(), visitCount, &_arraylengthNodes);
curTree = curTree->getNextTreeTop();
}
if (_isGlobalPropagation)
{
// Determine the size of the _globalConstraintsHashTable based on the number of nodes
//
uint32_t targetSize = (uint32_t)(comp()->getNodeCount() / 5); // that 5 was experimentally determined
const uint32_t globalConstraintsHashTableSizeUpperBound = 2048; // must be power of two
uint32_t globalConstraintsHashTableSize = 128; // starting value; must be power of two
if (targetSize >= globalConstraintsHashTableSizeUpperBound) // test for upper bound
globalConstraintsHashTableSize = globalConstraintsHashTableSizeUpperBound;
else
while (targetSize > globalConstraintsHashTableSize) // guaranteed to end
globalConstraintsHashTableSize <<= 1;
_globalConstraintsHTMaxBucketIndex = globalConstraintsHashTableSize - 1;
_globalConstraintsHashTable = (GlobalConstraint**)trMemory()->allocateStackMemory(globalConstraintsHashTableSize*sizeof(GlobalConstraint*));
memset(_globalConstraintsHashTable, 0, globalConstraintsHashTableSize*sizeof(GlobalConstraint*));
_edgeConstraintsHashTable = (EdgeConstraints**)trMemory()->allocateStackMemory(VP_HASH_TABLE_SIZE*sizeof(EdgeConstraints*));
memset(_edgeConstraintsHashTable, 0, VP_HASH_TABLE_SIZE*sizeof(EdgeConstraints*));
_loopDefsHashTable = (LoopDefsHashTableEntry**)trMemory()->allocateStackMemory(VP_HASH_TABLE_SIZE*sizeof(LoopDefsHashTableEntry*));
memset(_loopDefsHashTable, 0, VP_HASH_TABLE_SIZE*sizeof(LoopDefsHashTableEntry*));
}
else
{
_globalConstraintsHashTable = NULL;
_edgeConstraintsHashTable = NULL;
_loopDefsHashTable = NULL;
}
_visitCount = comp()->incVisitCount();
_edgesToBeRemoved = new (trStackMemory()) TR_Array<TR::CFGEdge *>(trMemory(), 8, false, stackAlloc);
_blocksToBeRemoved = new (trStackMemory()) TR_Array<TR::CFGNode*>(trMemory(), 8, false, stackAlloc);
_curDefinedOnAllPaths = NULL;
if (_isGlobalPropagation)
_definedOnAllPaths = new (trStackMemory()) DefinedOnAllPathsMap(std::less<TR::CFGEdge *>(), trMemory()->currentStackRegion());
else
_definedOnAllPaths = NULL;
_defMergedNodes = new (trStackMemory()) TR_BitVector(0, trMemory(), stackAlloc, growable);
_vcHandler.setRoot(_curConstraints, NULL);
_relationshipCache.setFirst(NULL);
_storeRelationshipCache.setFirst(NULL);
_valueConstraintCache = new (trStackMemory()) TR_Stack<ValueConstraint*>(trMemory(), 256, false, stackAlloc);
_loopInfo = NULL;
// unresolved symbols so we can track when they are known to be resolved.
// After these extra value numbers we allocate value numbers to represent
// induction variables.
//
{
static const char *e = feGetEnv("TR_maxValueNumber");
_firstUnresolvedSymbolValueNumber = e ? atoi(e) : (comp()->getOption(TR_ProcessHugeMethods) ? 200000 : 100000);
_syncValueNumber = _firstUnresolvedSymbolValueNumber - 1;
_firstInductionVariableValueNumber = _firstUnresolvedSymbolValueNumber * 2;
_numValueNumbers = _firstInductionVariableValueNumber;
}
// Enable preexistence if recompiling and this is not a profiling
// compilation
//
static char *disablePREX = feGetEnv("TR_disablePREX");
static char *disablePREXinVP = feGetEnv("TR_disablePREXinVP");
if (0 && !disablePREX && !disablePREXinVP &&
comp()->getMethodHotness() >= warm &&
comp()->couldBeRecompiled() &&
!comp()->getRecompilationInfo()->isProfilingCompilation() &&
!comp()->getOption(TR_DisableCHOpts))
{
enablePreexistence();
}
_reachedMaxRelationDepth = false;
_propagationDepth = 0;
static const char *pEnv = feGetEnv("TR_VPMaxRelDepth");
_maxPropagationDepth = pEnv ? atoi(pEnv) : MAX_RELATION_DEPTH;
if (comp()->getMethodHotness() > warm)
_maxPropagationDepth = _maxPropagationDepth * 3;
if (((comp()->getMethodHotness() > warm) || !comp()->isOptServer()) &&
(!comp()->getOption(TR_DisableBlockVersioner)))
{
if (!comp()->getFlowGraph()->getStructure() &&
(((comp()->mayHaveLoops() && optimizer()->getLastRun(OMR::loopVersioner)) || !comp()->mayHaveLoops()) &&
optimizer()->getLastRun(OMR::basicBlockExtension)))
{
dumpOptDetails(comp(), " (Doing structural analysis)\n");
TR_SingleTimer myTimer;
bool doTiming = comp()->getOption(TR_Timing);
if (doTiming)
{
myTimer.initialize("structural analysis", trMemory());
myTimer.startTiming(comp());
}
optimizer()->doStructuralAnalysis();
if ( doTiming)
{
myTimer.stopTiming(comp());
if (comp()->getOutFile() != NULL)
{
trfprintf(comp()->getOutFile(), "Time taken for %s = ", myTimer.title());
trfprintf(comp()->getOutFile(), "%9.6f seconds\n", myTimer.secondsTaken());
}
#ifdef OPT_TIMING
statStructuralAnalysisTiming.update((double)myTimer.timeTaken()*1000.0/TR::Compiler->vm.getHighResClockResolution());
#endif
}
}
if (comp()->getFlowGraph()->getStructure())
{
_enableVersionBlocks = true;
_bndChecks = new (trStackMemory()) TR_ScratchList<TR::Node>(trMemory());
//The bitVector is growable /bc when we devirtaulize calls we add symbol references for the call and the parameters.
_seenDefinedSymbolReferences = new (trStackMemory()) TR_BitVector(comp()->getSymRefCount(), trMemory(), stackAlloc, growable);
_blocksToBeVersioned = new (trStackMemory()) TR_LinkHead<BlockVersionInfo>();
_firstLoads = new (trStackMemory()) TR_LinkHead<FirstLoadOfNonInvariant>();
_startEBB = NULL;
}
}
_unsafeArrayAccessNodes = new (trStackMemory()) TR_BitVector(comp()->getNodeCount(), trMemory(), stackAlloc, growable);
}
OMR::ValuePropagation::Relationship *OMR::ValuePropagation::copyRelationships(Relationship *first)
{
TR_LinkHeadAndTail<Relationship> list;
for (Relationship *rel = first; rel; rel = rel->getNext())
{
Relationship *newRel = createRelationship(rel->relative, rel->constraint);
list.append(newRel);
}
return list.getFirst();
}
OMR::ValuePropagation::StoreRelationship *OMR::ValuePropagation::copyStoreRelationships(StoreRelationship *first)
{
TR_LinkHeadAndTail<StoreRelationship> list;
for (StoreRelationship *rel = first; rel; rel = rel->getNext())
{
StoreRelationship *newRel = createStoreRelationship(rel->symbol, copyRelationships(rel->relationships.getFirst()));
list.append(newRel);
}
return list.getFirst();
}
OMR::ValuePropagation::ValueConstraint *OMR::ValuePropagation::createValueConstraint(int32_t valueNumber, Relationship *relationships, StoreRelationship *storeRelationships)
{
ValueConstraint *vc;
if (!_valueConstraintCache->isEmpty())
vc = _valueConstraintCache->pop();
else
vc = new (trStackMemory()) ValueConstraint(valueNumber);
vc->initialize(valueNumber, relationships, storeRelationships);
return vc;
}
void OMR::ValuePropagation::freeValueConstraint(ValueConstraint *vc)
{
freeRelationships(vc->relationships);
freeStoreRelationships(vc->storeRelationships);
_valueConstraintCache->push(vc);
}
int32_t OMR::ValuePropagation::getValueNumber(TR::Node *node)
{
static const char *disableLocalVPConstNumbering = feGetEnv("TR_DisableLocalVPConstNumbering");
if (_isGlobalPropagation)
return _valueNumberInfo->getValueNumber(node);
else
{
if (node->getOpCode().isStore())
{
if (node->getOpCode().isIndirect())
return node->getSecondChild()->getGlobalIndex();
else
return node->getFirstChild()->getGlobalIndex();
}
else if (node->getOpCode().isLoadConst()
&& node->canGet64bitIntegralValue()
&& !disableLocalVPConstNumbering)
{
int64_t value = node->get64bitIntegralValue();
CS2::HashIndex index;
if (_constNodeInfo.Locate(value, index))
{
TR::list<TR::Node *>* nodeList = _constNodeInfo[index];
TR_ASSERT(nodeList, "NodeList must be non-NULL");
TR::Node *result = NULL;
for(auto nodeCursor = nodeList->begin(); (result == NULL) && (nodeCursor != nodeList->end()); ++nodeCursor)
{
TR::Node *candidate = *nodeCursor;
if (candidate->getDataType() == node->getDataType())
result = candidate;
}
if (!result)
{
nodeList->push_back(node);
return node->getGlobalIndex();
}
return result->getGlobalIndex();
}
else
{
// we have not seen this constant before so setup a constant table entry
// and use the current node's global index as the value number
TR::list<TR::Node *>* nodeList = new (comp()->trHeapMemory()) TR::list<TR::Node*>(getTypedAllocator<TR::Node*>(comp()->allocator()));
nodeList->push_back(node);
_constNodeInfo.Add(value, nodeList);
return node->getGlobalIndex();
}
}
else
return node->getGlobalIndex();
}
}
TR::VPConstraint *OMR::ValuePropagation::getConstraint(TR::Node *node, bool &isGlobal, TR::Node *relative)
{
/*
If we return a non-null constraint, isGlobal will be set accordingly.
If we return a null constraint, isGlobal defaults to true: it is safe to globally assume
that we know nothing about this node.
*/
isGlobal = true;
// See if there is an existing constraint for this node
//
int32_t valueNumber = getValueNumber(node);
int32_t relativeVN = relative ? getValueNumber(relative) : AbsoluteConstraint;
// Look for an existing local constraint. If we find it we are done.
//
TR::VPConstraint *constraint = NULL;
Relationship *rel = findConstraint(valueNumber, relativeVN);
if (rel)
{
if (trace())
{
traceMsg(comp(), " %s [%p] has existing constraint:", node->getOpCode().getName(), node);
rel->print(this, valueNumber, 1);
}
isGlobal = false;
constraint = rel->constraint;
}
// If the node is a use node, look at its def points and merge constraints
// from them.
//
else
{
constraint = mergeDefConstraints(node, relativeVN, isGlobal);
}
// If looking at the defs gave us a valid constraint, see if it can
// be further constrained by global constraints, and then set it up as a
// block or global constraint as appropriate.
//
if (constraint)
{
TR::VPConstraint *betterConstraint = applyGlobalConstraints(node, valueNumber, constraint, relativeVN);
addBlockOrGlobalConstraint(node, betterConstraint, isGlobal, relative);
return constraint;
}
// Look for an existing global constraint.
//
rel = findGlobalConstraint(valueNumber, relativeVN);
if (rel)
{
if (trace())
{
traceMsg(comp(), " %s [%p] has existing global constraint:", node->getOpCode().getName(), node);
rel->print(this, valueNumber, 1);
}
isGlobal = true;
constraint = rel->constraint;
}
return constraint;
}
void OMR::ValuePropagation::removeNode(TR::Node *node, bool anchorIt)
{
// If the node has a reference count more than one, anchor it in a
// treetop _preceeding_ the current treetop to avoid swing-down problems.
//
if (node->getReferenceCount() > 1)
{
// if (anchorIt &&
// !node->getOpCode().isLoadConst() &&
// _curTree->getNextTreeTop() != _curBlock->getExit())
// TR::TreeTop::create(comp(), _curTree, TR::Node::create( TR::treetop, 1, node));
// node->decReferenceCount();
// The above is wrong, put it _before_ the current tree. By definition, children
// must be evaluated before the parent, so they belong before the parent tree.
// Also, we have to do this even if the curtree is the last tree in the block, since the node may
// be commoned in the extended basic block following
//
if (anchorIt && !node->getOpCode().isLoadConst())
TR::TreeTop::create(comp(), _curTree->getPrevTreeTop(), TR::Node::create(TR::treetop, 1, node));
node->decReferenceCount();
}
// Otherwise this is the one and only use of the node. Prepare it
// for removal from the trees.
//
else
{
removeChildren(node, anchorIt);
if (optimizer()->prepareForNodeRemoval(node, /* deferInvalidatingUseDefInfo = */ true))
invalidateUseDefInfo();
if (node->getOpCode().isCheck())
setChecksRemoved();
// Make sure the node is not a valid def node any more
//
node->setUseDefIndex(0);
node->decReferenceCount();
}
}
void OMR::ValuePropagation::removeChildren(TR::Node *node, bool anchorIt)
{
for (int32_t i = node->getNumChildren()-1; i >= 0; i--)
{
removeNode(node->getChild(i), anchorIt);
}
node->setNumChildren(0);
}
static bool canCauseOSR(TR::TreeTop *tt, TR::Compilation *comp)
{
if (comp->isPotentialOSRPointWithSupport(tt))
return true;
return false;
}
void OMR::ValuePropagation::processTrees(TR::TreeTop *startTree, TR::TreeTop *endTree)
{
TR::TreeTop *treeTop;
TR::TreeTop *lastRealTreeTop = _curBlock->getLastRealTreeTop();
bool lastTtIsBndchk = false;
bool nextBlockIsExtentionOfThis = false;
int32_t checkIfNextBlockReachable = 1; // yes
ValueConstraint *prevVC = NULL;
if (_enableVersionBlocks && lastTimeThrough() &&
(startTree->getNode()->getOpCodeValue() == TR::BBStart))
{
TR::Block *block = startTree->getNode()->getBlock();
TR_BlockStructure *blockStructure = NULL;
blockStructure = block->getStructureOf();
_disableVersionBlockForThisBlock = false;
if (!block->isExtensionOfPreviousBlock())
_startEBB = block;
if (lastRealTreeTop->getNode()->getOpCode().isBndCheck())
lastTtIsBndchk = true;
if ( block->isCatchBlock() ||
(blockStructure && blockStructure->getContainingLoop() && !optimizer()->getLastRun(OMR::loopVersioner)) ||
( block->isCold()))
_disableVersionBlockForThisBlock = true;
TR::TreeTop *nextStartBlock = block->getExit()->getNextTreeTop();
if (nextStartBlock && nextStartBlock->getNode()->getBlock()->isExtensionOfPreviousBlock())
nextBlockIsExtentionOfThis = true;
}
for (treeTop = startTree; ((treeTop != endTree) && (treeTop != _curBlock->getExit())); treeTop = _curTree->getNextTreeTop())
{
_curTree = treeTop;
TR::Node *treeTopNode = treeTop->getNode();
if (trace())
traceMsg(comp(), "Processing ttNode n%in %s\n", treeTopNode->getGlobalIndex(),
treeTopNode->getOpCode().getName());
if (_enableVersionBlocks && !_disableVersionBlockForThisBlock && treeTop == lastRealTreeTop &&
!lastTtIsBndchk && lastTimeThrough())
{
if (!nextBlockIsExtentionOfThis)
{
createNewBlockInfoForVersioning(_startEBB);
}
else
{
// next block is an extension of this
// block; unreachability is known only
// after this tree is processed
checkIfNextBlockReachable = -1; // maybe
prevVC = copyValueConstraints(_curConstraints);
}
}
TR::Node *oldTreeTopNode = treeTopNode;
bool changedNode = false;
static char *launchChild = feGetEnv("TR_enableLaunchFirstChild");
if (launchChild && treeTopNode->getOpCodeValue() == TR::treetop)
{
setCurrentParent(treeTopNode);
treeTopNode = treeTopNode->getFirstChild();
changedNode = true;
}
if (canCauseOSR(treeTop, comp()))
createExceptionEdgeConstraints(TR::Block::CanCatchOSR, NULL, treeTopNode);
launchNode(treeTopNode, NULL, 0);
if (changedNode)
{
setCurrentParent(oldTreeTopNode);
}
// check if the next block has become
// unreachable; if so, allow block versioner
// to collect info for this ebb below
if (checkIfNextBlockReachable < 0)
{
if (isUnreachablePath(_curConstraints))
checkIfNextBlockReachable = 0; // its unreachable
}
// launchNode may have changed _curTree so that processing is resumed
// after the new _curTree value.
// If the tree is to be removed, do that now
//
if (!treeTop->getNode())
{
if (_curTree == treeTop)
_curTree = treeTop->getPrevTreeTop();
TR::TransformUtil::removeTree(comp(), treeTop);
}
if (_reachedMaxRelationDepth)
return;
}
if (_enableVersionBlocks && !_disableVersionBlockForThisBlock && lastTimeThrough())
{
if (lastTtIsBndchk && !nextBlockIsExtentionOfThis)
{
createNewBlockInfoForVersioning(_startEBB);
}
else if (checkIfNextBlockReachable == 0)
{
// temporarily zap the _curConstraints to
// the previous value to allow block versioner
// to collect info
ValueConstraint *oldCurVC = copyValueConstraints(_curConstraints);
_vcHandler.setRoot(_curConstraints, prevVC);
createNewBlockInfoForVersioning(_startEBB);
_vcHandler.setRoot(_curConstraints, oldCurVC);
}
}
}
int32_t OMR::ValuePropagation::getPrimitiveArrayType(char primitiveArrayChar)
{
switch (primitiveArrayChar)
{
case 'B': return 8;
case 'C': return 5;
case 'D': return 7;
case 'F': return 6;
case 'I': return 10;
case 'J': return 11;
case 'S': return 9;
case 'Z': return 4;
default: return 1;
}
}
#ifdef J9_PROJECT_SPECIFIC
static
TR_ResolvedMethod * findResolvedClassMethod(TR::Compilation * comp, char * className, char * methodName, char * methodSig)
{
TR_OpaqueClassBlock * classHandle = comp->fe()->getClassFromSignature(className, strlen(className), comp->getCurrentMethod());
if (classHandle)
{
TR_ScratchList<TR_ResolvedMethod> classMethods(comp->trMemory());
comp->fej9()->getResolvedMethods(comp->trMemory(), classHandle, &classMethods);
ListIterator<TR_ResolvedMethod> it(&classMethods);
TR_ResolvedMethod *method;
int methodNameLen = strlen(methodName);
int methodSigLen = strlen(methodSig);
for (method = it.getCurrent(); method; method = it.getNext())
{
if (!strncmp(method->nameChars(), methodName, methodNameLen) && !strncmp(method->signatureChars(), methodSig, methodSigLen))
return method;
}
}
return NULL;
}
#endif
void OMR::ValuePropagation::removeArrayCopyNode(TR::TreeTop *arraycopyTree)
{
ListElement<TR_TreeTopWrtBarFlag> *elem = _unknownTypeArrayCopyTrees.getListHead();
ListElement<TR_TreeTopWrtBarFlag> *prev = NULL;
while (elem)
{
if (elem->getData()->_treetop == arraycopyTree)
break;
prev = elem;
elem = elem->getNextElement();
}
if (elem)
{
if (prev)
prev->setNextElement(elem->getNextElement());
else
_unknownTypeArrayCopyTrees.setListHead(elem->getNextElement());
}
// Reference arrays list
//
elem = _referenceArrayCopyTrees.getListHead();
prev = NULL;
while (elem)
{
if (elem->getData()->_treetop == arraycopyTree)
break;
prev = elem;
elem = elem->getNextElement();
}
if (elem)
{
if (prev)
prev->setNextElement(elem->getNextElement());
else
_referenceArrayCopyTrees.setListHead(elem->getNextElement());
}
// Array copy spine check list
//
ListElement<TR_ArrayCopySpineCheck> *acscElem = _arrayCopySpineCheck.getListHead();
ListElement<TR_ArrayCopySpineCheck> *acscPrev = NULL;
while (acscElem)
{
if (acscElem->getData()->_arraycopyTree == arraycopyTree)
break;
acscPrev = acscElem;
acscElem = acscElem->getNextElement();
}
if (acscElem)
{
if (acscPrev)
acscPrev->setNextElement(acscElem->getNextElement());
else
_arrayCopySpineCheck.setListHead(acscElem->getNextElement());
}
}
TR::Node * createHdrSizeNode(TR::Compilation *comp, TR::Node *n)
{
TR::Node *hdrSize = NULL;
if (comp->target().is64Bit())
{
hdrSize = TR::Node::create(n, TR::lconst);
hdrSize->setLongInt((int64_t)TR::Compiler->om.contiguousArrayHeaderSizeInBytes());
}
else
hdrSize = TR::Node::create(n, TR::iconst, 0, (int32_t)TR::Compiler->om.contiguousArrayHeaderSizeInBytes());
return hdrSize;
}
TR::Node* generateLenForArrayCopy(TR::Compilation *comp, int32_t elementSize, TR::Node *stride,TR::Node *srcObjNode,TR::Node *copyLenNode,TR::Node *n)
{
bool is64BitTarget = comp->target().is64Bit() ? true : false;
TR::Node *len = NULL;
if (elementSize == 1)
{
len = copyLenNode->createLongIfNeeded();
}
else if (elementSize == 0)
{
#ifdef J9_PROJECT_SPECIFIC
if (!stride)
stride = TR::TransformUtil::generateArrayElementShiftAmountTrees(comp, srcObjNode);
#endif
if (is64BitTarget)
{
if (stride->getType().isInt32())
stride = TR::Node::create(TR::i2l, 1, stride);
if (copyLenNode->getType().isInt32())
{
TR::Node *i2lNode = TR::Node::create(TR::i2l, 1, copyLenNode);
len = TR::Node::create(TR::lshl, 2, i2lNode, stride);
}
else
len = TR::Node::create(TR::lshl, 2, copyLenNode, stride);
}
else
len = TR::Node::create(TR::ishl, 2, copyLenNode, stride);
}
else
{
if (is64BitTarget)
{
if (!stride)
{
stride = TR::Node::create(n , TR::lconst);
stride->setLongInt(elementSize);
}
else if (stride->getType().isInt32())
stride = TR::Node::create(TR::i2l, 1, stride);
if (copyLenNode->getType().isInt32())
{
TR::Node *i2lNode = TR::Node::create(TR::i2l, 1, copyLenNode);
len = TR::Node::create(TR::lmul, 2, i2lNode, stride);
}
else
len = TR::Node::create(TR::lmul, 2, copyLenNode, stride);
}
else
{
if (!stride)
stride = TR::Node::create(n, TR::iconst, 0, elementSize);
len = TR::Node::create(TR::imul, 2, copyLenNode, stride);
}
}
return len;
}
bool OMR::ValuePropagation::canRunTransformToArrayCopy()
{
if (!lastTimeThrough())
return false;
if ((comp()->getMethodHotness() >= hot) &&
!_isGlobalPropagation &&
!getLastRun())
return false;
return true;
}
bool OMR::ValuePropagation::transformUnsafeCopyMemoryCall(TR::Node *arrayCopyNode)
{
return false;
}
void OMR::ValuePropagation::transformArrayCopyCall(TR::Node *node)
{
bool is64BitTarget = comp()->target().is64Bit();
// Check to see if this is a call to java/lang/System.arraycopy
if (!node->isArrayCopyCall())
return;
if (!canRunTransformToArrayCopy())
return;
// Sanity check
TR_ASSERT(node->getNumChildren() == 5, "Wrong number of arguments for arraycopy.");
TR::Node *srcObjNode = node->getFirstChild();
TR::Node *srcOffNode = node->getSecondChild();
TR::Node *dstObjNode = node->getChild(2);
TR::Node *dstOffNode = node->getChild(3);
TR::Node *copyLenNode= node->getChild(4);
int32_t srcOffLow;
int32_t srcOffHigh;
int32_t dstOffLow;
int32_t dstOffHigh;
int32_t copyLenLow;
int32_t copyLenHigh;
int32_t srcLength = -1;
int32_t dstLength = -1;
int32_t elementSize = 0;
int32_t arraySpineShift = 0;
TR::DataType type = TR::NoType;
bool transformTheCall = false;
bool primitiveArray1 = false;
bool referenceArray1 = false;
bool primitiveArray2 = false;
bool referenceArray2 = false;
bool needArrayCheck = true;
bool needArrayStoreCheck = true;
bool needWriteBarrier = true;
bool needReadBarrier = TR::Compiler->om.readBarrierType() != gc_modron_readbar_none;
bool primitiveTransform = cg()->getSupportsPrimitiveArrayCopy();
bool referenceTransform = cg()->getSupportsReferenceArrayCopy();
bool isSrcPossiblyNull = true; // pessimistic
bool isDstPossiblyNull = true;
bool needSameLeafCheckForSrc = false;
bool needSameLeafCheckForDst = false;
bool isMultiLeafArrayCopy = false;
bool isRecognizedMultiLeafArrayCopy = false;
if (trace() && comp()->generateArraylets())
traceMsg(comp(), "Detected arraylet arraycopy: %p\n", node);
bool isGlobal;
TR::VPConstraint *srcObject = getConstraint(srcObjNode, isGlobal);
TR::VPConstraint *srcOffset = getConstraint(srcOffNode, isGlobal);
TR::VPConstraint *dstObject = getConstraint(dstObjNode, isGlobal);
TR::VPConstraint *dstOffset = getConstraint(dstOffNode, isGlobal);
TR::VPConstraint *copyLen = getConstraint(copyLenNode, isGlobal);
int32_t srcVN = getValueNumber(srcObjNode);
int32_t dstVN = getValueNumber(dstObjNode);
if (srcVN == dstVN)
{
needArrayStoreCheck = false;
switch (TR::Compiler->om.writeBarrierType())
{
case gc_modron_wrtbar_cardmark:
case gc_modron_wrtbar_cardmark_and_oldcheck:
case gc_modron_wrtbar_cardmark_incremental:
break;
default:
needWriteBarrier = false;
break;
}
}
switch (TR::Compiler->om.writeBarrierType())
{
case gc_modron_wrtbar_oldcheck:
case gc_modron_wrtbar_cardmark:
case gc_modron_wrtbar_cardmark_and_oldcheck:
case gc_modron_wrtbar_cardmark_incremental:
break;
default:
needWriteBarrier = false;
break;
}
TR::VPArrayInfo *srcArrayInfo;
TR::VPArrayInfo *dstArrayInfo;
srcOffLow = srcOffset ? srcOffset->getLowInt() : TR::getMinSigned<TR::Int32>();
srcOffHigh = srcOffset ? srcOffset->getHighInt() : TR::getMaxSigned<TR::Int32>();
dstOffLow = dstOffset ? dstOffset->getLowInt() : TR::getMinSigned<TR::Int32>();
dstOffHigh = dstOffset ? dstOffset->getHighInt() : TR::getMaxSigned<TR::Int32>();
copyLenLow = copyLen ? copyLen->getLowInt() : TR::getMinSigned<TR::Int32>();
copyLenHigh = copyLen ? copyLen->getHighInt() : TR::getMaxSigned<TR::Int32>();
// If the call must fail, don't transform it. The rest of the block can be
// removed.
//
if ((srcObject && srcObject->isNullObject()) ||