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OMRCodeGenerator.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
*******************************************************************************/
#if defined(J9ZOS390)
#pragma csect(CODE,"TRCGBase#C")
#pragma csect(STATIC,"TRCGBase#S")
#pragma csect(TEST,"TRCGBase#T")
#endif
#include "codegen/CodeGenerator.hpp"
#include <limits.h>
#include <stdarg.h>
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <algorithm>
#include "codegen/CodeGenPhase.hpp"
#include "codegen/CodeGenerator.hpp"
#include "codegen/CodeGenerator_inlines.hpp"
#include "env/FrontEnd.hpp"
#include "codegen/Instruction.hpp"
#include "codegen/Linkage.hpp"
#include "codegen/Linkage_inlines.hpp"
#include "codegen/LinkageConventionsEnum.hpp"
#include "codegen/LiveRegister.hpp"
#include "codegen/Machine.hpp"
#include "codegen/RealRegister.hpp"
#include "codegen/RecognizedMethods.hpp"
#include "codegen/Register.hpp"
#include "codegen/RegisterConstants.hpp"
#include "codegen/RegisterPair.hpp"
#include "codegen/RegisterUsage.hpp"
#include "codegen/Relocation.hpp"
#include "codegen/Snippet.hpp"
#include "codegen/StorageInfo.hpp"
#include "codegen/TreeEvaluator.hpp"
#include "codegen/GCStackMap.hpp"
#include "codegen/GCStackAtlas.hpp"
#include "compile/Compilation.hpp"
#include "compile/OSRData.hpp"
#include "compile/ResolvedMethod.hpp"
#include "compile/SymbolReferenceTable.hpp"
#include "control/Options.hpp"
#include "control/Options_inlines.hpp"
#include "cs2/bitmanip.h"
#include "cs2/hashtab.h"
#include "env/CompilerEnv.hpp"
#include "env/IO.hpp"
#include "env/PersistentInfo.hpp"
#include "env/TRMemory.hpp"
#include "env/jittypes.h"
#include "il/AliasSetInterface.hpp"
#include "il/AutomaticSymbol.hpp"
#include "il/Block.hpp"
#include "il/DataTypes.hpp"
#include "il/ILOpCodes.hpp"
#include "il/ILOps.hpp"
#include "il/LabelSymbol.hpp"
#include "il/Node.hpp"
#include "il/NodePool.hpp"
#include "il/Node_inlines.hpp"
#include "il/RegisterMappedSymbol.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/Bit.hpp"
#include "infra/BitVector.hpp"
#include "infra/Cfg.hpp"
#include "infra/Flags.hpp"
#include "infra/HashTab.hpp"
#include "infra/Link.hpp"
#include "infra/List.hpp"
#include "infra/Stack.hpp"
#include "infra/Checklist.hpp"
#include "infra/CfgEdge.hpp"
#include "infra/CfgNode.hpp"
#include "optimizer/Optimizations.hpp"
#include "optimizer/DataFlowAnalysis.hpp"
#include "ras/Debug.hpp"
#include "ras/DebugCounter.hpp"
#include "ras/Delimiter.hpp"
#include "runtime/CodeCache.hpp"
#include "runtime/CodeCacheExceptions.hpp"
#include "runtime/CodeCacheManager.hpp"
#include "runtime/Runtime.hpp"
#include "stdarg.h"
#include "OMR/Bytes.hpp"
namespace TR { class Optimizer; }
namespace TR { class RegisterDependencyConditions; }
OMR::TreeEvaluatorFunctionPointerTable OMR::CodeGenerator::_nodeToInstrEvaluators;
OMR::TreeEvaluatorFunctionPointer
OMR::TreeEvaluatorFunctionPointerTable::table[] =
{
#define OPCODE_MACRO(\
opcode, \
name, \
prop1, \
prop2, \
prop3, \
prop4, \
dataType, \
typeProps, \
childProps, \
swapChildrenOpcode, \
reverseBranchOpcode, \
boolCompareOpcode, \
ifCompareOpcode, \
...) TR::TreeEvaluator::opcode ## Evaluator,
TR::TreeEvaluator::BadILOpEvaluator,
#include "il/Opcodes.enum"
#undef OPCODE_MACRO
#define VECTOR_OPERATION_MACRO(\
operation, \
name, \
prop1, \
prop2, \
prop3, \
prop4, \
dataType, \
typeProps, \
childProps, \
swapChildrenOpcode, \
reverseBranchOpcode, \
boolCompareOpcode, \
ifCompareOpcode, \
...) TR::TreeEvaluator::operation ## Evaluator,
TR::TreeEvaluator::BadILOpEvaluator,
#include "il/VectorOperations.enum"
#undef VECTOR_OPERATION_MACRO
};
void OMR::TreeEvaluatorFunctionPointerTable::checkTableSize()
{
static_assert((TR::NumScalarIlOps + TR::NumVectorOperations) ==
(sizeof(table) / sizeof(table[0])),
"OMR::TreeEvaluatorFunctionPointerTable::table is not the correct size");
}
#define OPT_DETAILS "O^O CODE GENERATION: "
TR::Instruction *
OMR::CodeGenerator::generateNop(TR::Node * node, TR::Instruction *instruction, TR_NOPKind nopKind)
{ TR_ASSERT(0, "shouldn't get here"); return NULL;}
TR::CodeGenerator *
OMR::CodeGenerator::create(TR::Compilation *comp)
{
TR::CodeGenerator *cg = new (comp->trHeapMemory()) TR::CodeGenerator(comp);
cg->initialize();
return cg;
}
OMR::CodeGenerator::CodeGenerator(TR::Compilation *comp) :
_compilation(comp),
_trMemory(comp->trMemory()),
_liveLocals(0),
_currentEvaluationTreeTop(0),
_currentEvaluationBlock(0),
_prePrologueSize(0),
_implicitExceptionPoint(0),
_localsThatAreStored(NULL),
_numLocalsWhenStoreAnalysisWasDone(-1),
_symRefTab(comp->getSymRefTab()),
_vmThreadRegister(NULL),
_stackAtlas(NULL),
_methodStackMap(NULL),
_binaryBufferStart(NULL),
_binaryBufferCursor(NULL),
_largestOutgoingArgSize(0),
_warmCodeEnd(NULL),
_coldCodeStart(NULL),
_estimatedWarmCodeLength(0),
_estimatedColdCodeLength(0),
_estimatedCodeLength(0),
_estimatedSnippetStart(0),
_accumulatedInstructionLengthError(0),
_registerSaveDescription(0),
_extendedToInt64GlobalRegisters(comp->allocator()),
_liveButMaybeUnreferencedLocals(NULL),
_assignedGlobalRegisters(NULL),
_aheadOfTimeCompile(NULL),
_globalRegisterTable(NULL),
_currentGRABlockLiveOutSet(NULL),
_localsIG(NULL),
_lastGlobalGPR(0),
_firstGlobalFPR(0),
_lastGlobalFPR(0),
_firstOverlappedGlobalFPR(0),
_lastOverlappedGlobalFPR(0),
_last8BitGlobalGPR(0),
_globalGPRPartitionLimit(0),
_globalFPRPartitionLimit(0),
_firstInstruction(NULL),
_appendInstruction(NULL),
_lastWarmInstruction(NULL),
_firstGlobalVRF(-1),
_lastGlobalVRF(-1),
_firstOverlappedGlobalVRF(-1),
_lastOverlappedGlobalVRF(-1),
_overlapOffsetBetweenFPRandVRFgrns(0),
_supportedLiveRegisterKinds(0),
_blocksWithCalls(NULL),
_codeCache(0),
_committedToCodeCache(false),
_codeCacheSwitched(false),
_blockRegisterPressureCache(NULL),
_simulatedNodeStates(NULL),
_availableSpillTemps(getTypedAllocator<TR::SymbolReference*>(comp->allocator())),
_counterBlocks(getTypedAllocator<TR::Block*>(comp->allocator())),
_liveReferenceList(getTypedAllocator<TR_LiveReference*>(comp->allocator())),
_snippetList(getTypedAllocator<TR::Snippet*>(comp->allocator())),
_registerArray(comp->trMemory()),
_spill4FreeList(getTypedAllocator<TR_BackingStore*>(comp->allocator())),
_spill8FreeList(getTypedAllocator<TR_BackingStore*>(comp->allocator())),
_spill16FreeList(getTypedAllocator<TR_BackingStore*>(comp->allocator())),
_spill32FreeList(getTypedAllocator<TR_BackingStore*>(comp->allocator())),
_spill64FreeList(getTypedAllocator<TR_BackingStore*>(comp->allocator())),
_internalPointerSpillFreeList(getTypedAllocator<TR_BackingStore*>(comp->allocator())),
_firstTimeLiveOOLRegisterList(NULL),
_spilledRegisterList(NULL),
_afterRA(false),
_referencedRegistersList(NULL),
_variableSizeSymRefPendingFreeList(getTypedAllocator<TR::SymbolReference*>(comp->allocator())),
_variableSizeSymRefFreeList(getTypedAllocator<TR::SymbolReference*>(comp->allocator())),
_variableSizeSymRefAllocList(getTypedAllocator<TR::SymbolReference*>(comp->allocator())),
_accumulatorNodeUsage(0),
_collectedSpillList(getTypedAllocator<TR_BackingStore*>(comp->allocator())),
_allSpillList(getTypedAllocator<TR_BackingStore*>(comp->allocator())),
_relocationList(getTypedAllocator<TR::Relocation*>(comp->allocator())),
_externalRelocationList(getTypedAllocator<TR::Relocation*>(comp->allocator())),
_staticRelocationList(comp->allocator()),
_preJitMethodEntrySize(0),
_jitMethodEntryPaddingSize(0),
_lastInstructionBeforeCurrentEvaluationTreeTop(NULL),
_unlatchedRegisterList(NULL),
_indentation(2),
_currentBlock(NULL),
_realVMThreadRegister(NULL),
_internalControlFlowNestingDepth(0),
_internalControlFlowSafeNestingDepth(0),
_stackOfArtificiallyInflatedNodes(comp->trMemory(), 16),
_stackOfMemoryReferencesCreatedDuringEvaluation(comp->trMemory(), 16),
randomizer(comp),
_outOfLineColdPathNestedDepth(0),
_codeGenPhase(self()),
_symbolDataTypeMap(comp->allocator()),
_lmmdFailed(false),
_objectFormat(NULL),
_snippetsToBePatchedOnClassUnload(getTypedAllocator<TR::Snippet*>(comp->allocator())),
_methodSnippetsToBePatchedOnClassUnload(getTypedAllocator<TR::Snippet*>(comp->allocator())),
_snippetsToBePatchedOnClassRedefinition(getTypedAllocator<TR::Snippet*>(comp->allocator()))
{
}
void
OMR::CodeGenerator::initialize()
{
TR::CodeGenerator *cg = self();
TR::Compilation *comp = self()->comp();
_machine = new (cg->trHeapMemory()) TR::Machine(cg);
_disableInternalPointers = comp->getOption(TR_MimicInterpreterFrameShape) ||
comp->getOptions()->realTimeGC() ||
comp->getOption(TR_DisableInternalPointers);
uintptr_t maxSize = TR::Compiler->vm.getOverflowSafeAllocSize(comp);
int32_t i;
for (i = 0; i < NumRegisterKinds; ++i)
{
_liveRegisters[i] = NULL;
_liveRealRegisters[i] = 0;
}
for (i = 0 ; i < TR_NumLinkages; ++i)
_linkages[i] = NULL;
_maxObjectSizeGuaranteedNotToOverflow = static_cast<uint32_t>((maxSize > UINT_MAX) ? UINT_MAX : maxSize);
if (comp->getDebug())
{
comp->getDebug()->resetDebugData();
}
cg->setIsLeafMethod();
cg->createObjectFormat();
}
TR_StackMemory
OMR::CodeGenerator::trStackMemory()
{
return self()->trMemory();
}
TR_FrontEnd *
OMR::CodeGenerator::fe()
{
return self()->comp()->fe();
}
TR_Debug *
OMR::CodeGenerator::getDebug()
{
return self()->comp()->getDebug();
}
/*
* generateCodeFromIL
*
* Translate IL trees into executable machine instructions for the target
* architecture. This method provides te default functionality for generating
* code. It should be overridden to provide customized functionality.
*
* Returns: true if successful, false otherwise
*/
bool
OMR::CodeGenerator::generateCodeFromIL()
{
return false;
}
void
OMR::CodeGenerator::insertGotoIntoLastBlock(TR::Block *lastBlock)
{
// If the last tree in the last block is not a TR_goto, insert a goto tree
// at the end of the block.
// If there is a following block the goto will branch to it so that when the
// code is split any fall-through will go to the right place.
// If there is no following block the goto will branch to the first block; in
// this case the goto should never be reached, it is there only to
// make sure that the instruction following the last real treetop will be in
// method's code, so if it is a helper call (e.g. for a throw) the return address
// is in this method's code.
//
TR::Compilation *comp = self()->comp();
TR::TreeTop * tt;
TR::Node * node;
if (lastBlock->getNumberOfRealTreeTops() == 0)
tt = lastBlock->getEntry();
else
tt = lastBlock->getLastRealTreeTop();
node = tt->getNode();
if (!(node->getOpCode().isGoto() ||
node->getOpCode().isJumpWithMultipleTargets() ||
node->getOpCode().isReturn()))
{
if (comp->getOption(TR_TraceCG))
{
traceMsg(comp, "%s Inserting goto at the end of block_%d\n", SPLIT_WARM_COLD_STRING, lastBlock->getNumber());
}
// Find the block to be branched to
//
TR::TreeTop * targetTreeTop = lastBlock->getExit()->getNextTreeTop();
if (targetTreeTop)
// Branch to following block. Make sure it is not marked as an
// extension block so that it will get a label generated.
//
targetTreeTop->getNode()->getBlock()->setIsExtensionOfPreviousBlock(false);
else
// Branch to the first block. This will not be marked as an extension
// block.
//
targetTreeTop = comp->getStartBlock()->getEntry();
// Generate the goto and insert it into the end of the last warm block.
//
TR::TreeTop *gotoTreeTop = TR::TreeTop::create(comp, TR::Node::create(node, TR::Goto, 0, targetTreeTop));
// Move reg deps from BBEnd to goto
//
TR::Node *bbEnd = lastBlock->getExit()->getNode();
if (bbEnd->getNumChildren() > 0)
{
TR::Node *glRegDeps = bbEnd->getChild(0);
gotoTreeTop->getNode()->setNumChildren(1);
gotoTreeTop->getNode()->setChild(0, glRegDeps);
bbEnd->setChild(0,NULL);
bbEnd->setNumChildren(0);
}
tt->insertAfter(gotoTreeTop);
}
}
void OMR::CodeGenerator::prepareLastWarmBlockForCodeSplitting()
{
TR::Compilation *comp = self()->comp();
TR::TreeTop * tt;
TR::Node * node;
TR::Block * block = NULL;
TR::Block * firstColdBlock = NULL, * firstColdExtendedBlock = NULL;
int32_t numColdBlocks = 0, numNonOutlinedColdBlocks = 0;
for (tt = comp->getStartTree(); tt; tt = tt->getNextTreeTop())
{
node = tt->getNode();
if (node->getOpCodeValue() == TR::BBStart)
{
block = node->getBlock();
// If this is the first cold block, remember where the warm blocks ended.
// If it is a warm block and cold blocks have already been found, they
// are treated as warm.
//
if (block->isCold())
{
if (!firstColdBlock)
firstColdBlock = block;
numColdBlocks++;
}
else if (firstColdBlock)
{
firstColdBlock = NULL;
firstColdExtendedBlock = NULL;
numNonOutlinedColdBlocks = numColdBlocks;
}
if (!block->isExtensionOfPreviousBlock())
{
if (firstColdBlock &&
!firstColdExtendedBlock)
{
if (!block->getPrevBlock() ||
!block->getPrevBlock()->canFallThroughToNextBlock())
{
firstColdExtendedBlock = block;
}
else
{
firstColdBlock = NULL;
numNonOutlinedColdBlocks = numColdBlocks;
}
}
}
}
}
// Mark the split point between warm and cold blocks, so they can be
// allocated in different code sections.
//
TR::Block *lastWarmBlock;
if (firstColdExtendedBlock)
{
lastWarmBlock = firstColdExtendedBlock->getPrevBlock();
if (!lastWarmBlock)
{
// All the blocks are cold: insert a new goto block ahead of real blocks
//
lastWarmBlock = comp->insertNewFirstBlock();
}
}
else
{
// All the blocks are warm - the split point is between the last
// instruction and the snippets.
//
lastWarmBlock = block;
}
lastWarmBlock->setIsLastWarmBlock();
if (comp->getOption(TR_TraceCG))
{
traceMsg(comp, "%s Last warm block is block_%d\n", SPLIT_WARM_COLD_STRING, lastWarmBlock->getNumber());
if (numColdBlocks > 0)
traceMsg(comp, "%s Moved to cold code cache %d out of %d cold blocks (%d%%)\n",
SPLIT_WARM_COLD_STRING,
numColdBlocks - numNonOutlinedColdBlocks,
numColdBlocks,
(numColdBlocks - numNonOutlinedColdBlocks)*100/numColdBlocks);
}
insertGotoIntoLastBlock(lastWarmBlock);
TR::Block *lastBlock = comp->findLastTree()->getNode()->getBlock();
// If disclaim is enabled, it may happen that nothing follows mainline code
// (no snippets or OOL). Then, we need to insert a goto at the end for the
// reasons described in insertGotoIntoLastBlock()
//
if (TR::Options::getCmdLineOptions()->getOption(TR_EnableCodeCacheDisclaiming) &&
lastBlock != lastWarmBlock)
{
insertGotoIntoLastBlock(lastBlock);
}
}
void OMR::CodeGenerator::lowerTrees()
{
TR::Delimiter d(self()->comp(), self()->comp()->getOption(TR_TraceCG), "LowerTrees");
// Go through the trees and lower any nodes that need to be lowered. This
// involves a call to the VM to replace the trees with other trees.
//
// During this loop, more trees may be added after the current tree
//
// NOTE: when changing, please be aware that during the following tree walk some trees
// might be removed (look at lowerTreeIfNeeded)
//
// traverse to lower the trees
// visitCount should not be incremented until it finishes
//
self()->preLowerTrees();
TR::TreeTop * tt;
TR::Node * node;
vcount_t visitCount = self()->comp()->incVisitCount();
for (tt = self()->comp()->getStartTree(); tt; tt = tt->getNextTreeTop())
{
node = tt->getNode();
TR_ASSERT(node->getVisitCount() != visitCount, "Code Gen: error in lowering trees");
TR_ASSERT(node->getReferenceCount() == 0, "Code Gen: error in lowering trees");
self()->lowerTreesPreTreeTopVisit(tt, visitCount);
// First lower the children
//
self()->lowerTreesWalk(node, tt, visitCount);
self()->lowerTreeIfNeeded(node, 0, 0, tt);
self()->lowerTreesPostTreeTopVisit(tt, visitCount);
}
self()->postLowerTrees();
}
void OMR::CodeGenerator::postLowerTrees()
{
if (comp()->getOption(TR_SplitWarmAndColdBlocks) &&
!comp()->compileRelocatableCode())
{
self()->prepareLastWarmBlockForCodeSplitting();
}
}
void
OMR::CodeGenerator::lowerTreesWalk(TR::Node * parent, TR::TreeTop * treeTop, vcount_t visitCount)
{
parent->setVisitCount(visitCount);
self()->lowerTreesPreChildrenVisit(parent, treeTop, visitCount);
// Go through the subtrees and lower any nodes that need to be lowered. This
// involves a call to the VM to replace the trees with other trees.
//
for (int32_t childCount = 0; childCount < parent->getNumChildren(); childCount++)
{
TR::Node *child = parent->getChild(childCount);
// If the subtree needs to be lowered, call the VM to lower it
//
if (child->getVisitCount() != visitCount)
{
self()->lowerTreesWalk(child, treeTop, visitCount);
self()->lowerTreeIfNeeded(child, childCount, parent, treeTop);
}
}
self()->lowerTreesPostChildrenVisit(parent, treeTop, visitCount);
}
void
OMR::CodeGenerator::lowerTreesPropagateBlockToNode(TR::Node *node)
{
if (self()->comp()->getFlowGraph()->getNextNodeNumber() < SHRT_MAX)
{
node->setLocalIndex(self()->getCurrentBlock()->getNumber());
}
else
{
node->setLocalIndex(-1);
}
}
void
OMR::CodeGenerator::preLowerTrees()
{
int32_t symRefCount = self()->comp()->getSymRefCount();
_localsThatAreStored = new (self()->comp()->trHeapMemory()) TR_BitVector(symRefCount, self()->comp()->trMemory(), heapAlloc);
_numLocalsWhenStoreAnalysisWasDone = symRefCount;
}
void
OMR::CodeGenerator::lowerTreesPreTreeTopVisit(TR::TreeTop *tt, vcount_t visitCount)
{
TR::Node *node = tt->getNode();
if (node->getOpCodeValue() == TR::BBStart)
{
TR::Block *block = node->getBlock();
self()->setCurrentBlock(block);
}
}
void
OMR::CodeGenerator::lowerTreesPostTreeTopVisit(TR::TreeTop *tt, vcount_t visitCount)
{
}
void
OMR::CodeGenerator::lowerTreesPostChildrenVisit(TR::Node * parent, TR::TreeTop * treeTop, vcount_t visitCount)
{
}
void
OMR::CodeGenerator::setUpForInstructionSelection()
{
self()->comp()->incVisitCount();
// prepareNodeForInstructionSelection is called during a separate walk of the treetops because
// the _register and _label fields are unioned members of a node. prepareNodeForInstructionSelection
// zeros the _register field while the second for loop sets label fields on destination nodes.
//
TR::TreeTop * tt=NULL, *prev = NULL;
for (tt = self()->comp()->getStartTree(); tt; tt = tt->getNextTreeTop())
{
self()->prepareNodeForInstructionSelection(tt->getNode());
}
for (tt = self()->comp()->getStartTree(); tt; prev=tt, tt = tt->getNextTreeTop())
{
TR::Node * node = tt->getNode();
if ((node->getOpCodeValue() == TR::treetop) ||
node->getOpCode().isAnchor() ||
node->getOpCode().isCheck())
{
node = node->getFirstChild();
}
TR::ILOpCode & opcode = node->getOpCode();
if (opcode.getOpCodeValue() == TR::BBStart)
{
self()->setCurrentBlock(node->getBlock());
}
else if (opcode.isLoadVarOrStore())
{
TR::Symbol * sym = node->getSymbol();
TR::AutomaticSymbol *local = sym->getAutoSymbol();
if (local)
{
local->incReferenceCount();
}
}
else if (opcode.isBranch())
{
if (node->getBranchDestination()->getNode()->getLabel() == NULL)
{
// need to get the label type from the target block for RAS
TR::LabelSymbol * label =
TR::LabelSymbol::create(self()->trHeapMemory(),self(),node->getBranchDestination()->getNode()->getBlock());
node->getBranchDestination()->getNode()->setLabel(label);
}
}
else if (opcode.isSwitch())
{
uint16_t upperBound = node->getCaseIndexUpperBound();
for (int i = 1; i < upperBound; ++i)
{
if (node->getChild(i)->getBranchDestination()->getNode()->getLabel() == NULL)
{
TR::LabelSymbol *label = generateLabelSymbol(self());
node->getChild(i)->getBranchDestination()->getNode()->setLabel(label);
}
}
}
else if (opcode.isCall() || opcode.getOpCodeValue() == TR::arraycopy)
{
self()->setUpStackSizeForCallNode(node);
}
}
}
/**
* \brief The uncommon-call-constant-node pass is an extra pre-codegen pass
* before instruction selection. It aims to avoid the situation where
* a constant integer is made alive across calls and, thereby, lower the preserved register
* pressure caused due to this.
*
* \details
*
* \verbatim
* Take z/Architecture as an example, we could run into the following situation where constant
* integer 16 is loaded to a preserved register GPR6, which is then loaded to GPR2 as call
* parameter. The GPR6 will be preserved by the callee and can incur extra register shuffling.
*
* LHI GPR6,0x10 # immediate value in preserved register
* LGR GPR2,GPR6 # load parameter from preserved register again
* LG GPR14,#609 -216(GPR7)
* LGHI GPR0,0xff28
* BASR GPR14,GPR14 # call virtual function, which will unnecessarily preserve GPR6.
* LGR GPR2,GPR6 # load parameter from preserved register again for the next use
* ...
*
* \endverbatim
*
* Loading integer constants as immediate values [i.e. LHI GPR2, 0x10] is preferred.
* The ranges for immediate value loading on different platforms are governed by the following
* platform-specific query:
*
* \verbatim
* bool materializesLargeConstants()
* bool shouldValueBeInACommonedNode(int64_t value)
* \endverbatim
*
*/
void
OMR::CodeGenerator::uncommonCallConstNodes()
{
TR::Compilation* comp = self()->comp();
if(comp->getOption(TR_TraceCG))
{
traceMsg(comp, "Performing uncommon call constant nodes\n");
}
TR::NodeChecklist checklist(comp);
for (TR::TreeTop* tt = self()->comp()->getStartTree(); tt; tt = tt->getNextTreeTop())
{
TR::Node* node = tt->getNode();
if(node->getNumChildren() >= 1 &&
node->getFirstChild()->getOpCode().isFunctionCall())
{
TR::Node* callNode = node->getFirstChild();
if(checklist.contains(callNode))
{
if(comp->getOption(TR_TraceCG))
{
traceMsg(comp, "Skipping previously visited call node %d\n", callNode->getGlobalIndex());
}
continue;
}
checklist.add(callNode);
for(uint32_t i = 0; i < callNode->getNumChildren(); ++i)
{
TR::Node* paramNode = callNode->getChild(i);
if(paramNode->getReferenceCount() > 1 &&
paramNode->getOpCode().isLoadConst() &&
!self()->isMaterialized(paramNode))
{
if(self()->comp()->getOption(TR_TraceCG))
{
traceMsg(comp, "Uncommon const node %X [n%dn]\n",
paramNode, paramNode->getGlobalIndex());
}
TR::Node* newConstNode = TR::Node::create(paramNode->getOpCodeValue(), 0);
newConstNode->setConstValue(paramNode->getConstValue());
callNode->setAndIncChild(i, newConstNode);
paramNode->decReferenceCount();
}
}
}
}
}
void
OMR::CodeGenerator::doInstructionSelection()
{
TR::Compilation *comp = self()->comp();
// Set default value for pre-prologue size
//
self()->setPrePrologueSize(0);
if (comp->getOption(TR_TraceCG))
{
diagnostic("\n<selection>");
}
if (comp->getOption(TR_TraceCG) || debug("traceGRA"))
{
self()->getDebug()->setupToDumpTreesAndInstructions("Performing Instruction Selection");
}
self()->beginInstructionSelection();
TR_BitVector *liveLocals = self()->getLiveLocals();
TR_BitVector nodeChecklistBeforeDump(comp->getNodeCount(), self()->trMemory(), stackAlloc, growable);
for (TR::TreeTop *tt = comp->getStartTree(); tt; tt = self()->getCurrentEvaluationTreeTop()->getNextTreeTop())
{
TR::Instruction *prevInstr = self()->getAppendInstruction();
TR::Node *node = tt->getNode();
TR::ILOpCodes opCode = node->getOpCodeValue();
TR::Node *firstChild = node->getNumChildren() > 0 ? node->getFirstChild() : 0;
if (opCode == TR::BBStart)
{
TR::Block *block = node->getBlock();
self()->setCurrentEvaluationBlock(block);
if (!block->isExtensionOfPreviousBlock())
{
// If we are keeping track of live locals, set up the live locals for
// this block
//
if (liveLocals)
{
if (block->getLiveLocals())
{
liveLocals = new (self()->trHeapMemory()) TR_BitVector(*block->getLiveLocals());
}
else
{
liveLocals = new (self()->trHeapMemory()) TR_BitVector(*liveLocals);
liveLocals->empty();
}
}
}
if (self()->getDebug())
{
self()->getDebug()->roundAddressEnumerationCounters();
}
#if DEBUG
// Verify that we are only being more conservative by inheriting the live
// local information from the previous block.
//
else if (liveLocals && debug("checkBlockEntryLiveLocals"))
{
TR_BitVector *extendedBlockLocals = new (self()->trStackMemory()) TR_BitVector(*(block->getLiveLocals()));
*extendedBlockLocals -= *(liveLocals);
TR_ASSERT(extendedBlockLocals->isEmpty(),
"Live local information is *less* pessimistic!\n");
}
#endif
}
self()->setLiveLocals(liveLocals);
if (comp->getOption(TR_TraceCG) || debug("traceGRA"))
{
// any evaluator that handles multiple trees will need to dump
// the others
self()->getDebug()->saveNodeChecklist(nodeChecklistBeforeDump);
self()->getDebug()->dumpSingleTreeWithInstrs(tt, NULL, true, false, true, true);
traceMsg(comp, "\n------------------------------\n");
}
self()->setCurrentEvaluationTreeTop(tt);
self()->setImplicitExceptionPoint(NULL);
// -----------------------------------------------------------------------
// Node evaluation
//
self()->evaluate(node);
if (comp->getOption(TR_TraceCG) || debug("traceGRA"))
{
TR::Instruction *lastInstr = self()->getAppendInstruction();
tt->setLastInstruction(lastInstr == prevInstr ? 0 : lastInstr);
}
if (liveLocals)
{
TR::AutomaticSymbol * liveSym = 0;
if (debug("checkBlockEntryLiveLocals"))
{
// Check for a store into a local.
// If so, this local becomes live at this point.
//
if (node->getOpCode().isStore())
{
liveSym = node->getSymbol()->getAutoSymbol();
}
// Check for a loadaddr of a local object.
// If so, this local object becomes live at this point.
//
else if (opCode == TR::treetop)
{
if (firstChild->getOpCodeValue() == TR::loadaddr)
{
liveSym = firstChild->getSymbol()->getLocalObjectSymbol();
}
}
if (liveSym && liveSym->getLiveLocalIndex() == (uint16_t)-1)
{
liveSym = NULL;
}
}
else
{
// Check for a store into a collected local reference.
// If so, this local becomes live at this point.
//
if (opCode == TR::astore)
{
liveSym = node->getSymbol()->getAutoSymbol();
}
// Check for a loadaddr of a local object containing collected references.
// If so, this local object becomes live at this point.
//
else if (opCode == TR::treetop)
{
if (firstChild->getOpCodeValue() == TR::loadaddr)
{
liveSym = firstChild->getSymbol()->getLocalObjectSymbol();
}
}
if (liveSym && !liveSym->isCollectedReference())
{
liveSym = NULL;