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OMRBlock.cpp
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OMRBlock.cpp
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/*******************************************************************************
* Copyright (c) 2000, 2020 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
*******************************************************************************/
#include "il/Block.hpp"
#include <limits.h>
#include <stdint.h>
#include <string.h>
#include <stdio.h>
#include "codegen/CodeGenerator.hpp"
#include "env/FrontEnd.hpp"
#include "compile/Compilation.hpp"
#include "compile/CompilationTypes.hpp"
#include "compile/Method.hpp"
#include "compile/ResolvedMethod.hpp"
#include "compile/SymbolReferenceTable.hpp"
#include "control/Options.hpp"
#include "control/Options_inlines.hpp"
#include "env/CompilerEnv.hpp"
#include "env/TRMemory.hpp"
#include "env/jittypes.h"
#include "il/AliasSetInterface.hpp"
#include "il/AutomaticSymbol.hpp"
#include "il/Block.hpp"
#include "il/Block_inlines.hpp"
#include "il/DataTypes.hpp"
#include "il/ILOpCodes.hpp"
#include "il/ILOps.hpp"
#include "il/LabelSymbol.hpp"
#include "il/Node.hpp"
#include "il/Node_inlines.hpp"
#include "il/RegisterMappedSymbol.hpp"
#include "il/ResolvedMethodSymbol.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/Flags.hpp"
#include "infra/ILWalk.hpp"
#include "infra/Link.hpp"
#include "infra/List.hpp"
#include "infra/CfgEdge.hpp"
#include "infra/CfgNode.hpp"
#include "optimizer/Inliner.hpp"
#include "optimizer/Optimizer.hpp"
#include "optimizer/RegisterCandidate.hpp"
#include "optimizer/Structure.hpp"
#include "optimizer/TransformUtil.hpp"
#include "ras/Debug.hpp"
class TR_Memory;
namespace TR { class DebugCounterAggregation; }
namespace TR { class Instruction; }
TR::Block *
OMR::Block::createEmptyBlock(TR::Compilation *comp, int32_t frequency, TR::Block *block)
{
if (!comp->isPeekingMethod() && (comp->getFlowGraph()->getMaxFrequency() >= 0))
TR_ASSERT((frequency >= 0), "Block frequency must be non negative\n");
return TR::Block::createEmptyBlock(0, comp, frequency, block);
}
TR::Block *
OMR::Block::asBlock() { return self(); }
OMR::Block::Block(TR_Memory * m) :
TR::CFGNode(m)
{
self()->init(NULL, NULL);
self()->setFrequency(-1);
self()->setUnrollFactor(0);
}
OMR::Block::Block(TR::CFG &cfg) :
TR::CFGNode(cfg.getInternalRegion())
{
self()->init(NULL, NULL);
self()->setFrequency(-1);
self()->setUnrollFactor(0);
}
OMR::Block::Block(TR::TreeTop *entry, TR::TreeTop *exit, TR_Memory * m) :
TR::CFGNode(m)
{
self()->init(entry, exit);
self()->setFrequency(-1);
self()->setUnrollFactor(0);
if (entry && entry->getNode()) entry->getNode()->setBlock(self());
if (exit && exit->getNode()) exit->getNode()->setBlock(self());
}
OMR::Block::Block(TR::TreeTop *entry, TR::TreeTop *exit, TR::CFG &cfg) :
TR::CFGNode(cfg.getInternalRegion())
{
self()->init(entry, exit);
self()->setFrequency(-1);
self()->setUnrollFactor(0);
if (entry && entry->getNode()) entry->getNode()->setBlock(self());
if (exit && exit->getNode()) exit->getNode()->setBlock(self());
}
void
OMR::Block::init(TR::TreeTop *entry, TR::TreeTop *exit)
{
_pEntry = entry;
_pExit = exit;
_pStructureOf = NULL;
_liveLocals = NULL;
_globalRegisters = 0;
_catchBlockExtension = NULL;
_firstInstruction = NULL;
_lastInstruction = NULL;
_blockSize = -1;
_debugCounters = NULL;
_flags = 0;
_moreflags = 0;
}
TR::Block*
OMR::Block::createBlock(TR::TreeTop *entry, TR::TreeTop *exit, TR::CFG &cfg)
{
return new (cfg.getInternalRegion()) TR::Block(entry, exit, cfg);
}
/// Copy constructor
OMR::Block::Block(TR::Block &other, TR::TreeTop *entry, TR::TreeTop *exit) :
TR::CFGNode(other._region),
_pEntry(entry),
_pExit(exit),
_pStructureOf(NULL),
_liveLocals(NULL),
_globalRegisters(0),
_firstInstruction(other._firstInstruction),
_lastInstruction(other._lastInstruction),
_blockSize(other._blockSize),
_debugCounters(other._debugCounters),
_catchBlockExtension(NULL)
{
if (entry && entry->getNode()) entry->getNode()->setBlock(self());
if (exit && exit->getNode()) exit->getNode()->setBlock(self());
if (other._liveLocals)
_liveLocals = new (other._region) TR_BitVector(*other._liveLocals);
if (other._catchBlockExtension)
{
_catchBlockExtension = new (other._region)
TR_CatchBlockExtension(*other._catchBlockExtension);
}
self()->setFrequency(other.getFrequency());
if (other._globalRegisters)
_globalRegisters = new (other._region) TR_Array<TR_GlobalRegister>(*other._globalRegisters);
_flags.set(other._flags.getValue());
_moreflags.set(other._moreflags.getValue());
_unrollFactor = other.getUnrollFactor();
}
TR::Block *
OMR::Block::getNextBlock()
{
TR::TreeTop * t = _pExit->getNextTreeTop();
return t ? t->getNode()->getBlock() : 0;
}
TR::Block *
OMR::Block::getPrevBlock()
{
TR::TreeTop * t = _pEntry->getPrevTreeTop();
return t ? t->getNode()->getBlock() : 0;
}
TR::Block *
OMR::Block::getNextExtendedBlock()
{
TR::Block * b = self()->getNextBlock();
for (; b && b->isExtensionOfPreviousBlock(); b = b->getNextBlock())
;
return b;
}
// append a node under a treetop and before the bbend
TR::TreeTop *
OMR::Block::append(TR::TreeTop * tt)
{
return self()->getExit()->insertBefore(tt);
}
/**
* Prepend a OMR::Block::node under a treetop immediately after the bbStart
*/
TR::TreeTop *
OMR::Block::prepend(TR::TreeTop * tt)
{
return self()->getEntry()->insertAfter(tt);
}
TR::TreeTop *
OMR::Block::getFirstRealTreeTop()
{
TR_ASSERT(self()->getEntry() && self()->getEntry()->getNextTreeTop(), "Block must have valid entry treetop\n");
TR::TreeTop * tt = self()->getEntry()->getNextTreeTop();
while (tt->getNode()->getOpCode().isExceptionRangeFence())
tt = tt->getNextTreeTop();
return tt;
}
TR::TreeTop *
OMR::Block::getLastRealTreeTop()
{
TR_ASSERT(self()->getExit() && self()->getExit()->getPrevTreeTop(), "Block must have valid exit treetop\n");
TR::TreeTop * tt = self()->getExit()->getPrevTreeTop();
while (tt->getNode()->getOpCode().isExceptionRangeFence())
tt = tt->getPrevTreeTop();
return tt;
}
TR::TreeTop *
OMR::Block::getLastNonControlFlowTreeTop()
{
TR::TreeTop *tt = self()->getLastRealTreeTop();
while (tt->getNode()->getOpCode().isBranch() ||
tt->getNode()->getOpCode().isReturn() ||
tt->getNode()->getOpCode().isJumpWithMultipleTargets())
{
tt = tt->getPrevTreeTop();
}
return tt;
}
int32_t
OMR::Block::getNumberOfRealTreeTops()
{
TR_ASSERT(self()->getEntry(), "Block must have valid entry treetop\n");
int32_t numRealTreeTops = 0;
TR::TreeTop * tt = self()->getEntry()->getNextRealTreeTop();
TR::TreeTop *exitTree = self()->getExit();
while (tt != exitTree)
{
tt = tt->getNextRealTreeTop();
numRealTreeTops++;
}
return numRealTreeTops;
}
TR::Block *
OMR::Block::createEmptyBlock(TR::Node * n, TR::Compilation *comp, int32_t frequency, TR::Block *block)
{
if (!comp->isPeekingMethod() && (comp->getFlowGraph()->getMaxFrequency() >= 0))
{
TR_ASSERT((frequency >= 0), "Block frequency must be non negative\n");
}
if (block!=NULL) comp->setCurrentBlock(block);
TR::Block * b =
new (comp->trHeapMemory()) TR::Block(
TR::TreeTop::create(comp, TR::Node::create(n, TR::BBStart)),
TR::TreeTop::create(comp, TR::Node::create(n, TR::BBEnd)),
comp->trMemory());
b->getEntry()->join(b->getExit());
b->setFrequency(frequency);
return b;
}
int32_t
OMR::Block::getMaxColdFrequency(TR::Block *b1, TR::Block *b2)
{
int32_t max = -1;
int32_t frequency = b1->getFrequency();
if (b1->isCold())
max = frequency;
frequency = b2->getFrequency();
if (b2->isCold())
{
if (frequency > max)
max = frequency;
}
//TR_ASSERT((max > -1), "At least one of the blocks should be cold\n");
return max;
}
int32_t
OMR::Block::getMinColdFrequency(TR::Block *b1, TR::Block *b2)
{
int32_t min = INT_MAX;
int32_t frequency = b1->getFrequency();
if (b1->isCold())
min = frequency;
frequency = b2->getFrequency();
if (b2->isCold())
{
if (frequency < min)
min = frequency;
}
TR_ASSERT((min < INT_MAX), "At least one of the blocks should be cold\n");
return min;
}
int32_t
OMR::Block::getScaledSpecializedFrequency(int32_t fastFrequency)
{
return (int32_t) ((float) (1.0f - MIN_PROFILED_FREQUENCY)*fastFrequency);
}
bool
OMR::Block::isGotoBlock(TR::Compilation * comp, bool allowPrecedingSnapshots)
{
bool isGoToBlock = ( self()->getEntry() != NULL
&& self()->getLastRealTreeTop()->getPrevTreeTop() == self()->getEntry()
&& self()->getLastRealTreeTop()->getNode()->getOpCodeValue() == TR::Goto);
if (!isGoToBlock && allowPrecedingSnapshots && comp->getOption(TR_EnableSnapshotBlockOpts) && comp->getMethodSymbol()->hasSnapshots())
{
if (self()->getEntry() != NULL && self()->getLastRealTreeTop()->getNode()->getOpCodeValue() == TR::Goto)
{
for (TR::TreeTop *tt = self()->getLastRealTreeTop()->getPrevTreeTop(); tt != self()->getEntry(); tt = tt->getPrevTreeTop())
{
return false;
}
isGoToBlock = true;
}
}
return isGoToBlock;
}
bool
OMR::Block::canFallThroughToNextBlock()
{
TR::Node *lastNode = self()->getLastRealTreeTop()->getNode();
if (lastNode->getOpCodeValue() == TR::treetop)
lastNode = lastNode->getFirstChild();
if (lastNode->getOpCode().isGoto() ||
lastNode->getOpCode().isReturn() ||
lastNode->getOpCodeValue() == TR::athrow ||
lastNode->getOpCodeValue() == TR::igoto)
return false;
return true;
}
/**
* Here we will detect the case where we have a label at BBStart but that will never be used.
* If the only predecessor to the block belonging to the BBStart is the previous block that means that
* we will fallthrough to this block without a branch, and therefore we don't need a label. There are
* some exceptions:
* - If the previous block is a lookup, table or tstart block, then we might have a branch
* instruction to this block even if this block is the fallthrough block
* - if "canFallThroughToNextBlock()" returns false, we abort (it checks for similar situations)
*/
bool
OMR::Block::doesNotNeedLabelAtStart()
{
if (!self()->getEntry()->getNode()->getLabel())
return true;
if (self()->getEntry()->getNode()->getLabel()->isHasAddrTaken())
return false;
for (auto thisEdge = self()->getPredecessors().begin(); thisEdge != self()->getPredecessors().end(); ++thisEdge)
{
TR::Block * from = (*thisEdge)->getFrom()->asBlock();
TR::Block * prevBlock = self()->getPrevBlock();
if (from == prevBlock && from->canFallThroughToNextBlock())
{
TR::Node *lastNode = from->getLastRealTreeTop()->getNode();
if (lastNode->getOpCodeValue() == TR::treetop)
lastNode = lastNode->getFirstChild();
if (lastNode->getOpCodeValue() != TR::lookup &&
lastNode->getOpCodeValue() != TR::table &&
lastNode->getOpCodeValue() != TR::tstart &&
lastNode->getOpCodeValue() != TR::trtLookup)
continue;
}
return false;
}
return true;
}
/**
* Return fall through edge within a Ebb if any.
* Can handle dummy block created during inlining (callee has dummy nodes).
*/
TR::CFGEdge *
OMR::Block::getFallThroughEdgeInEBB()
{
TR::Block *fallThruCandidate = self()->getExit() ? self()->getNextBlock() : 0;
if (fallThruCandidate && fallThruCandidate->isExtensionOfPreviousBlock())
return self()->getEdge(fallThruCandidate);
return 0;
}
TR::Block *
OMR::Block::breakFallThrough(TR::Compilation *comp, TR::Block *faller, TR::Block *fallee)
{
TR::Node *lastNode = faller->getLastRealTreeTop()->getNode();
if (lastNode->getOpCode().isCheck() || lastNode->getOpCodeValue() == TR::treetop)
lastNode = lastNode->getFirstChild();
if (lastNode->getOpCode().isReturn() ||
lastNode->getOpCode().isGoto() ||
lastNode->getOpCode().isSwitch() ||
lastNode->getOpCode().isJumpWithMultipleTargets() ||
lastNode->getOpCodeValue() == TR::athrow)
return faller; // nothing to do
if (lastNode->getOpCode().isBranch())
{
TR::Node *gotoNode = TR::Node::create(lastNode, TR::Goto);
TR::TreeTop *gotoTree = TR::TreeTop::create(comp, gotoNode);
gotoNode->setBranchDestination(fallee->getEntry());
TR::Block *gotoBlock = TR::Block::createEmptyBlock(lastNode, comp, (fallee->getFrequency() < faller->getFrequency()) ? fallee->getFrequency() : faller->getFrequency(), fallee);
gotoBlock->append(gotoTree);
faller->getExit()->join(gotoBlock->getEntry());
gotoBlock->getExit()->join(fallee->getEntry());
if (faller->getStructureOf())
comp->getFlowGraph()->addNode(gotoBlock, faller->getCommonParentStructureIfExists(fallee, comp->getFlowGraph()));
else
comp->getFlowGraph()->addNode(gotoBlock);
comp->getFlowGraph()->addEdge(TR::CFGEdge::createEdge(faller, gotoBlock, comp->trMemory()));
comp->getFlowGraph()->addEdge(TR::CFGEdge::createEdge(gotoBlock, fallee, comp->trMemory()));
// remove the edge only if the branch target is not pointing to the next block
if (lastNode->getBranchDestination() != fallee->getEntry())
comp->getFlowGraph()->removeEdge(faller, fallee);
if (fallee->isCold() || faller->isCold())
{
//gotoBlock->setIsCold();
if (fallee->isCold())
gotoBlock->setFrequency(fallee->getFrequency());
else
gotoBlock->setFrequency(faller->getFrequency());
}
return gotoBlock;
}
TR::Node *gotoNode = TR::Node::create(lastNode, TR::Goto);
TR::TreeTop *gotoTree = TR::TreeTop::create(comp, gotoNode);
gotoNode->setBranchDestination(fallee->getEntry());
faller->append(gotoTree);
return faller;
}
/**
* @note insertBlockAsFallThrough creates a new edge from block -> newFallThroughBlock. It does _NOT_
* remove any fall-through edge that might have previously existed from block. That responsibility
* is left to the caller since removing the edge at the wrong time could leave the original fallthrough
* successor with no predecessors which could leave it in an unexpectedly deleted state.
*/
void
OMR::Block::insertBlockAsFallThrough(TR::Compilation *comp, TR::Block *block, TR::Block *newFallThroughBlock)
{
TR::TreeTop *origFallThroughEntry = block->getExit()->getNextRealTreeTop();
TR::TreeTop *newFallThroughEntry = newFallThroughBlock->getEntry();
TR::TreeTop *beforeNewFallThrough = newFallThroughEntry->getPrevTreeTop();
TR::TreeTop *afterNewFallThrough = newFallThroughBlock->getExit()->getNextTreeTop();
TR::TreeTop *beforeOrigFallThrough = block->getExit();
// rip newFallThrough block out of trees
beforeNewFallThrough->join(afterNewFallThrough);
// now insert newFallThrough between end of block and its original fall-through successor
TR::TreeTop::insertTreeTops(comp, block->getExit(), newFallThroughBlock->getEntry(), newFallThroughBlock->getExit());
if (!block->hasSuccessor(newFallThroughBlock))
comp->getFlowGraph()->addEdge(block, newFallThroughBlock);
}
/**
* comment about when edge from from -> origTo will be removed (clients should be careful that origTo doesn't unexpectedly go poof!)
* @note redirectFlowToNewDestination will both create a new edge from "from" to "newTo" as well as remove the original edge from
* "from" to origTo. BE CAREFUL when calling this function that there is another predecessor edge for "origTo" or else when
* redirectFlowToNewDestination removes the predecessor "from", "origTo" might be deleted.
*/
void
OMR::Block::redirectFlowToNewDestination(TR::Compilation *comp, TR::CFGEdge *origEdge, TR::Block *newTo, bool useGotoForFallThrough)
{
TR::Block *from = origEdge->getFrom()->asBlock();
TR::Block *origTo = origEdge->getTo()->asBlock();
int32_t fromBlockNumber = from->getNumber();
int32_t origToBlockNumber = origTo->getNumber();
int32_t newToBlockNumber = newTo->getNumber();
if (from->getEntry() == NULL)
{
// from is entry, so only have to change the flow edges (no branch to change)
if (!from->hasSuccessor(newTo))
comp->getFlowGraph()->addEdge(from, newTo);
comp->getFlowGraph()->removeEdge(from, origTo);
}
else
{
TR::TreeTop *lastTreeTop = from->getLastRealTreeTop();
TR_ASSERT(lastTreeTop != NULL, "how can there be an entry but no last tree top?");
TR::Node *lastNode = lastTreeTop->getNode();
if (lastNode->getOpCode().isBranch() && lastNode->getBranchDestination() == origTo->getEntry())
{
// need to change the branch destination from origTo to newTo
from->changeBranchDestination(newTo->getEntry(), comp->getFlowGraph());
}
else if (lastNode->getOpCode().isSwitch())
{
TR::TreeTop *origToEntry = origTo->getEntry();
TR::TreeTop *newToEntry = newTo->getEntry();
// find correct switch target(s) and change it to newTo->getNumber()
for (int i=lastNode->getCaseIndexUpperBound()-1; i > 0; i--)
{
TR::Node *child=lastNode->getChild(i);
if (child->getBranchDestination() == origToEntry)
child->setBranchDestination(newToEntry);
}
if (!from->hasSuccessor(newTo))
comp->getFlowGraph()->addEdge(from, newTo);
comp->getFlowGraph()->removeEdge(from, origTo);
}
else if (lastNode->getOpCode().isJumpWithMultipleTargets())
{
if (lastNode->getOpCode().hasBranchChildren())
{
traceMsg(comp, "Jump with multple targets, with non fall through path to empty block\n");
TR::TreeTop *origToEntry = origTo->getEntry();
TR::TreeTop *newToEntry = newTo->getEntry();
if(origToEntry)
traceMsg(comp, "jumpwithmultipletargets: origToEntry->getNode = %p\n",origToEntry->getNode());
if(newToEntry)
traceMsg(comp, "jumpwithmultipletargets: newToEntry->getNode = %p\n",newToEntry->getNode());
// Get the right branch target
for (int32_t i=0 ; i < lastNode->getNumChildren()-1 ; i++)
{
TR::Node *child = lastNode->getChild(i);
traceMsg(comp, "considering node %p with branch destination %p \n",child,child->getBranchDestination() ? child->getBranchDestination()->getNode() : 0 );
if (child->getBranchDestination() == origToEntry)
{
child->setBranchDestination(newToEntry);
if (!from->hasSuccessor(newTo))
comp->getFlowGraph()->addEdge(from, newTo);
comp->getFlowGraph()->removeEdge(from, origTo);
}
}
}
else
{
if (!from->hasSuccessor(newTo))
comp->getFlowGraph()->addEdge(from, newTo);
comp->getFlowGraph()->removeEdge(from, origTo);
}
}
else
// from falls through to origTo
{
TR::TreeTop *origToEntry = origTo->getEntry();
TR::TreeTop *newToEntry = newTo->getEntry();
TR::TreeTop *afterNewTo = newTo->getExit()->getNextTreeTop();
TR_ASSERT(from->getExit()->getNextTreeTop() == origToEntry, "Expecting from's fallthrough to be origTo");
if (useGotoForFallThrough)
{
TR::TreeTop *gotoTreeTop = TR::TreeTop::create(comp, TR::Node::create(lastNode, TR::Goto, 0, newTo->getEntry()));
if (lastNode->getOpCode().isBranch())
{
int32_t freq = origEdge->getFrequency();
TR::Block *newGotoBlock = TR::Block::createEmptyBlock(lastNode, comp, freq, from);
newGotoBlock->append(gotoTreeTop);
comp->getFlowGraph()->addNode(newGotoBlock);
comp->getFlowGraph()->addEdge(from, newGotoBlock)->setFrequency(freq);
newGotoBlock->setIsExtensionOfPreviousBlock();
TR::Block::insertBlockAsFallThrough(comp, from, newGotoBlock); // edge won't be duplicated
comp->getFlowGraph()->addEdge(newGotoBlock, newTo)->setFrequency(freq);
comp->getFlowGraph()->removeEdge(from, origTo);
}
else
{
from->append(gotoTreeTop);
if (!from->hasSuccessor(newTo))
comp->getFlowGraph()->addEdge(from, newTo);
comp->getFlowGraph()->removeEdge(from, origTo);
}
}
else
{
TR::Block::insertBlockAsFallThrough(comp, from, newTo);
comp->getFlowGraph()->removeEdge(from, origTo);
}
}
}
}
/**
* This block is being removed from the CFG.
* Remove its trees from the list of trees.
*/
void
OMR::Block::removeFromCFG(TR::Compilation *c)
{
// Remove the trees for this block
//
if (_pEntry != NULL)
{
// Remove trees
for (TR::TreeTop *treeTop = _pEntry, *next; ; treeTop = next)
{
next = treeTop->getNextTreeTop();
TR::TransformUtil::removeTree(c, treeTop);
if (treeTop == _pExit)
break;
}
}
}
TR_RegionStructure *
OMR::Block::getParentStructureIfExists(TR::CFG *cfg)
{
TR_RegionStructure *parent = NULL;
if (self()->getStructureOf() &&
cfg->getStructure())
parent = self()->getStructureOf()->getParent()->asRegion();
return parent;
}
TR_RegionStructure *
OMR::Block::getCommonParentStructureIfExists(TR::Block *b, TR::CFG *cfg)
{
TR_RegionStructure *parent = NULL;
if (self()->getStructureOf() &&
b &&
b->getStructureOf() &&
cfg->getStructure())
parent = self()->getStructureOf()->findCommonParent(b->getStructureOf(), cfg);
return parent;
}
void
OMR::Block::removeBranch(TR::Compilation *c)
{
TR::TreeTop * tt = self()->getLastRealTreeTop();
TR_ASSERT(tt->getNode()->getOpCode().isBranch(), "OMR::Block::removeBranch, block doesn't have a branch");
c->getFlowGraph()->removeEdge(self(), tt->getNode()->getBranchDestination()->getNode()->getBlock());
TR::TransformUtil::removeTree(c, tt);
}
TR::Block *
OMR::Block::findVirtualGuardBlock(TR::CFG *cfg)
{
//TR_ASSERT(getExceptionPredecessors().empty(), "snippet block has an exception predecessor");
for (auto nextEdge = self()->getPredecessors().begin(); nextEdge != self()->getPredecessors().end(); ++nextEdge)
{
TR::Block *prevBlock = toBlock((*nextEdge)->getFrom());
// check for the entry block being the predecessor
// ie. the guard has probably been removed
if (prevBlock == cfg->getStart())
break;
//else if (prevBlock->getLastRealTreeTop()->getNode()->isTheVirtualGuardForAGuardedInlinedCall())
// return prevBlock;
else
{
TR::Node *node = prevBlock->getLastRealTreeTop()->getNode();
if (node->isTheVirtualGuardForAGuardedInlinedCall())
{
// extra check for profiled guards based on VFT
if (node->isProfiledGuard())
{
TR_ASSERT(((node->getOpCodeValue() == TR::ifacmpne) || (node->getOpCodeValue() == TR::ifacmpeq)), "Profile guards must use TR::ifacmpne || TR::ifacmpeq");
if (node->getOpCodeValue() == TR::ifacmpne)
{
if (node->getBranchDestination()->getEnclosingBlock() == self())
return prevBlock;
}
else if (node->getOpCodeValue() == TR::ifacmpeq)
{
if (prevBlock->getNextBlock() == self())
return prevBlock;
}
}
else
{
return prevBlock;
}
}
}
}
return 0;
}
void
OMR::Block::changeBranchDestination(TR::TreeTop * newDestination, TR::CFG *cfg, bool callerFixesRegdeps)
{
TR::Node * branchNode = self()->getLastRealTreeTop()->getNode();
TR_ASSERT(branchNode->getOpCode().isBranch(), "OMR::Block::changeBranchDestination: can't find the existing branch node");
TR::TreeTop * prevDestinationTree = branchNode->getBranchDestination();
if (newDestination == prevDestinationTree)
return; // Nothing to do. Stop here so we don't remove the edge.
TR::Block * prevDestinationBlock = prevDestinationTree->getNode()->getBlock();
branchNode->setBranchDestination(newDestination);
TR::Block * newDestinationBlock = newDestination->getNode()->getBlock();
TR::CFGEdge *prevEdge = self()->getEdge(prevDestinationBlock);
if (!self()->hasSuccessor(newDestinationBlock))
{
TR::CFGEdge *newEdge = cfg->addEdge(self(), newDestinationBlock);
int32_t prevEdgeFrequency = prevEdge->getFrequency();
if (prevDestinationBlock->getFrequency() > 0)
{
int32_t newEdgeFrequency = (prevEdgeFrequency*newDestinationBlock->getFrequency())/prevDestinationBlock->getFrequency();
newEdge->setFrequency(newEdgeFrequency);
}
}
cfg->removeEdge(prevEdge);
if (callerFixesRegdeps)
return;
int32_t numChildren = branchNode->getNumChildren();
if (numChildren >0 &&
branchNode->getChild(numChildren - 1)->getOpCodeValue() == TR::GlRegDeps)
{
TR::Node * fromGlRegDep = branchNode->getChild(numChildren - 1);
TR_ASSERT(fromGlRegDep->getOpCodeValue() == TR::GlRegDeps, "expected the branch child to be a GlRegDep. It's not!");
int32_t numFromGlRegDeps = fromGlRegDep->getNumChildren();
if (newDestination->getNode()->getNumChildren() == 0)
{
branchNode->setNumChildren(numChildren - 1);
for (int32_t i = 0; i < numFromGlRegDeps; ++i)
fromGlRegDep->getChild(i)->recursivelyDecReferenceCount();
}
else
{
TR::Node * toGlRegDep = newDestination->getNode()->getChild(0);
TR_ASSERT(toGlRegDep->getOpCodeValue() == TR::GlRegDeps, "expected the bbstart child to be a GlRegDep. It's not!");
TR_ASSERT(0, "todo: update the GlRegDep info");
}
}
else
{
TR_ASSERT(newDestination->getNode()->getNumChildren() == 0, "todo: update the GlRegDep info");
}
}
void
OMR::Block::uncommonNodesBetweenBlocks(TR::Compilation *comp, TR::Block *newBlock, TR::ResolvedMethodSymbol *methodSymbol)
{
TR_ScratchList<TR::SymbolReference> symbolReferenceTempsA(comp->trMemory());
TR_ScratchList<TR::SymbolReference> injectedBasicBlockTemps(comp->trMemory());
TR_ScratchList<TR::SymbolReference> symbolReferenceTempsC(comp->trMemory());
TR_HandleInjectedBasicBlock ibb(comp, NULL, methodSymbol? methodSymbol: comp->getMethodSymbol(),
symbolReferenceTempsA,
injectedBasicBlockTemps,
symbolReferenceTempsC);
ibb.findAndReplaceReferences(self()->getEntry(), newBlock, NULL);
ListIterator<TR::SymbolReference> injectedBasicBlockTempIter(&injectedBasicBlockTemps);
TR::SymbolReference * injectedBasicBlockTemp = injectedBasicBlockTempIter.getFirst();
for (; injectedBasicBlockTemp; injectedBasicBlockTemp = injectedBasicBlockTempIter.getNext())
{
comp->getMethodSymbol()->addAutomatic(injectedBasicBlockTemp->getSymbol()->castToAutoSymbol());
}
}
bool
OMR::Block::hasExceptionSuccessors()
{
bool hasExceptionSuccessors = (self()->getExceptionSuccessors().empty() == false);
return hasExceptionSuccessors;
}
bool
OMR::Block::isTargetOfJumpWhoseTargetCanBeChanged(TR::Compilation * comp)
{
TR::Block *startBlock = comp->getFlowGraph()->getStart()->asBlock();
for (auto predEdge = self()->getPredecessors().begin(); predEdge != self()->getPredecessors().end(); ++predEdge)
{
TR::Block *predBlock = (*predEdge)->getFrom()->asBlock();
if (predBlock != startBlock && predBlock->getLastRealTreeTop()->getNode()->getOpCode().isJumpWithMultipleTargets() &&
predBlock->getLastRealTreeTop()->getNode()->getOpCode().hasBranchChildren())
return true;
}
return false;
}
TR::Block *
OMR::Block::splitWithGivenMethodSymbol(TR::ResolvedMethodSymbol *methodSymbol, TR::TreeTop * startOfNewBlock, TR::CFG * cfg, bool fixupCommoning, bool copyExceptionSuccessors){
return self()->split(startOfNewBlock, cfg, fixupCommoning, copyExceptionSuccessors, methodSymbol);
}
// Required data structures for analysis in SplitPostGRA
typedef TR::typed_allocator<std::pair<TR::Node* const, std::pair<int32_t, TR::Node *> >, TR::Region&> NodeTableAllocator;
typedef std::less< TR::Node *> NodeTableComparator;
typedef std::map<TR::Node *, std::pair<int32_t, TR::Node *>, NodeTableComparator, NodeTableAllocator> NodeTable;
typedef TR::typed_allocator<std::pair <TR::Node* const, TR::Node *>, TR::Region&> StoreRegNodeTableAllocator;
typedef std::map<TR::Node *, TR::Node *, NodeTableComparator, StoreRegNodeTableAllocator> StoreRegNodeTable;
/*
* Recursive call to replace node with replacement node underneath a target node.
*
* @param A node to be replaced
* @param A table containing information about original nodes to be replaced with corresponding replacement node
* @param checklist Checklist of nodes that have already been searched.
*/
static void replaceNodesInSubtree(TR::Node *node, NodeTable *nodeInfo, TR::NodeChecklist &checklist)
{
if (checklist.contains(node))
return;
checklist.add(node);
for (int i = 0; i < node->getNumChildren(); ++i)
{
TR::Node *child = node->getChild(i);
auto entry = nodeInfo->find(child);
if (entry != nodeInfo->end())
{
node->setAndIncChild(i, entry->second.second);
child->decReferenceCount();
}
else
{
replaceNodesInSubtree(child, nodeInfo, checklist);
}
}
}
/*
* Search for the nodes to be uncommoned from the split point till end of extended basic block
*
* @param Compilation object
* @param start tree top from where it needs to start searching
* @param table containing information about original nodes to be replaced with corresponding replacement node
*/
static void replaceNodesInTrees(TR::Compilation * comp, TR::TreeTop *start, NodeTable *nodeInfo)
{
TR::NodeChecklist checklist(comp);
while (start)
{
if (start->getNode()->getOpCodeValue() == TR::BBStart && !start->getNode()->getBlock()->isExtensionOfPreviousBlock())
break;
replaceNodesInSubtree(start->getNode(), nodeInfo, checklist);
start = start->getNextTreeTop();
}
}
/*
* Analyzes the node and list of unavailable registers to find a register pair which can be used to store the node
*
* @param Compilation object
* @param Node which requires to be uncommoned
* @param BitVector constaining information about the unavailable registers
* @return Pair of GlobalRegisterNumber which can be used to store node
*/
static std::pair<TR_GlobalRegisterNumber,TR_GlobalRegisterNumber> findAvailableRegister(TR::Compilation *comp, TR::Node *node, TR_BitVector &unavailableRegisters)
{
TR_GlobalRegisterNumber firstGPR = comp->cg()->getFirstGlobalGPR();
TR_GlobalRegisterNumber lastGPR = comp->cg()->getLastGlobalGPR();
TR_GlobalRegisterNumber firstFPR = comp->cg()->getFirstGlobalFPR();
TR_GlobalRegisterNumber lastFPR = comp->cg()->getLastGlobalFPR();
TR_GlobalRegisterNumber firstVRF = comp->cg()->getFirstGlobalVRF();
TR_GlobalRegisterNumber lastVRF = comp->cg()->getLastGlobalVRF();
std::pair<TR_GlobalRegisterNumber,TR_GlobalRegisterNumber> toReturn = std::make_pair<TR_GlobalRegisterNumber,TR_GlobalRegisterNumber>(-1,-1);
TR_GlobalRegisterNumber start, end;
TR::DataType dt = node->getType();
if (dt.isIntegral() || dt.isAddress())
{
start = firstGPR;
end = lastGPR;
}
else if (dt.isFloatingPoint())
{
start = firstFPR;
end = lastFPR;
}
else if (dt.isVector())
{
start = firstVRF;
end = lastVRF;
}
else
{
return toReturn;
}
for (TR_GlobalRegisterNumber itr = start; itr < end; ++itr)
{
if (!unavailableRegisters.get(itr))
{
toReturn.first = itr;
unavailableRegisters.set(itr);
break;
}
}
if (node->requiresRegisterPair(comp) && toReturn.first > -1)
{
for (TR_GlobalRegisterNumber itr = start; itr < end; ++itr)
{
if (!unavailableRegisters.get(itr))
{
toReturn.second = itr;
unavailableRegisters.set(itr);
break;
}
}
if (toReturn.second == -1)
{
unavailableRegisters.reset(toReturn.first);
toReturn.first = -1;
}
}
return toReturn;
}
/*
* Returns a boolean notifying if the registers used by given nodes are available or not
*
* @param Compilation object
* @param Node whose used registers are required to be checked for availability
* @param BitVector constaining information about the unavailable registers
* @return A boolean notifying if the registers used by the RegStore can be uses for uncommoning node
*/
static bool checkIfRegisterIsAvailable(TR::Compilation *comp, TR::Node *node, TR_BitVector &unavailableRegisters)
{
// Following assert is to make sure that this function is called with node which have Global Registers associated with it.
TR_ASSERT_FATAL(node->getOpCode().isStoreReg(), "checkIfRegisterIsAvailable is used with %s while it is intended to use with RegStore nodes only", node->getName(comp->getDebug()));
bool registersAreAvailable = !unavailableRegisters.isSet(node->getGlobalRegisterNumber());
if (node->requiresRegisterPair(comp))
registersAreAvailable &= !unavailableRegisters.isSet(node->getHighGlobalRegisterNumber());
return registersAreAvailable;
}
/*
* Iterate through the list of StoreReg Node and associate the given passThroughNode with it.
*
* @param PassThrough node
* @param List of RegStore nodes
* @return A boolean notifying if registers used by passthrough node can be used for uncommoning
*/
static bool checkStoreRegNodeListForNode(TR::Node *passThroughNode, List<TR::Node> *storeNodeList)
{
TR::Node *value = passThroughNode->getFirstChild();
ListIterator<TR::Node> nodeListIter(storeNodeList);
for (TR::Node *storeNode = nodeListIter.getCurrent(); storeNode; storeNode=nodeListIter.getNext())
{
if (storeNode->getFirstChild() == value &&
storeNode->getLowGlobalRegisterNumber() == passThroughNode->getLowGlobalRegisterNumber() &&
storeNode->getHighGlobalRegisterNumber() == passThroughNode->getHighGlobalRegisterNumber())
return true;
}
return false;
}
/*
* Analyze the register dependency and update the list of unavailable registers.
* It examines the node under passthrough children of the glRegDeps and does the following.
* If node requires uncommoning and we do not have replacement yet, looks into the list
* that contains regStore before split point.
* a. If register is available, uses the register to create replacement.