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OMRCompilation.cpp
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OMRCompilation.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
*******************************************************************************/
#include "compile/Compilation.hpp"
#include <limits.h>
#include <math.h>
#include <signal.h>
#include <stdarg.h>
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <algorithm>
#include "codegen/CodeGenerator.hpp"
#include "env/FrontEnd.hpp"
#include "codegen/Instruction.hpp"
#include "codegen/Linkage.hpp"
#include "codegen/RecognizedMethods.hpp"
#include "compile/Compilation.hpp"
#include "compile/Compilation_inlines.hpp"
#include "compile/CompilationTypes.hpp"
#include "compile/Method.hpp"
#include "compile/OSRData.hpp"
#include "compile/ResolvedMethod.hpp"
#include "compile/SymbolReferenceTable.hpp"
#include "compile/VirtualGuard.hpp"
#include "control/OptimizationPlan.hpp"
#include "control/Options.hpp"
#include "control/Options_inlines.hpp"
#include "cs2/allocator.h"
#include "cs2/sparsrbit.h"
#include "env/CompilerEnv.hpp"
#include "env/CompileTimeProfiler.hpp"
#include "env/IO.hpp"
#include "env/ObjectModel.hpp"
#include "env/KnownObjectTable.hpp"
#include "env/PersistentInfo.hpp"
#include "env/StackMemoryRegion.hpp"
#include "env/TRMemory.hpp"
#include "env/TypeLayout.hpp"
#include "env/VerboseLog.hpp"
#include "env/defines.h"
#include "env/jittypes.h"
#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/NodePool.hpp"
#include "il/Node_inlines.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 "ilgen/IlGenRequest.hpp"
#include "ilgen/IlGeneratorMethodDetails.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/ILWalk.hpp"
#include "infra/Link.hpp"
#include "infra/List.hpp"
#include "infra/Random.hpp"
#include "infra/Stack.hpp"
#include "infra/CfgEdge.hpp"
#include "infra/Timer.hpp"
#include "infra/ThreadLocal.hpp"
#include "optimizer/DebuggingCounters.hpp"
#include "optimizer/Inliner.hpp"
#include "optimizer/Optimizations.hpp"
#include "optimizer/Optimizer.hpp"
#include "optimizer/RegisterCandidate.hpp"
#include "optimizer/Structure.hpp"
#include "optimizer/TransformUtil.hpp"
#include "ras/Debug.hpp"
#include "ras/DebugCounter.hpp"
#include "ras/ILValidationStrategies.hpp"
#include "ras/ILValidator.hpp"
#include "ras/IlVerifier.hpp"
#include "control/Recompilation.hpp"
#include "runtime/CodeCacheExceptions.hpp"
#include "ilgen/IlGen.hpp"
#include "env/RegionProfiler.hpp"
#include "omrformatconsts.h"
// this ratio defines how full the alias memory region is allowed to become before
// it is recreated after an optimization finishes
#define ALIAS_REGION_LOAD_FACTOR 0.75
#ifdef J9_PROJECT_SPECIFIC
#include "control/RecompilationInfo.hpp"
#include "runtime/RuntimeAssumptions.hpp"
#include "env/CHTable.hpp"
#include "env/VMJ9.h"
#endif
#ifdef J9ZOS390
#include<new>
// Workaround CSECT compile option bug on z/OS
#pragma csect(CODE,"Compilation#C")
#pragma csect(STATIC,"Compilation#S")
#pragma csect(TEST,"Compilation#T")
#endif
class TR_FrontEnd;
class TR_HWPRecord;
class TR_Memory;
class TR_OptimizationPlan;
class TR_PrexArgInfo;
class TR_PseudoRandomNumbersListElement;
class TR_ResolvedMethod;
namespace TR { class IlGenRequest; }
namespace TR { class Options; }
namespace TR { class CodeCache; }
namespace TR { class RegisterMappedSymbol; }
namespace OMR
{
tlsDefine(TR::Compilation *, compilation);
}
TR::SymbolReference *
OMR::Compilation::getSymbolReferenceByReferenceNumber(int32_t referenceNumber)
{
return self()->getSymRefTab()->getSymRef(referenceNumber);
}
ncount_t
OMR::Compilation::getNodeCount()
{
_nodeCount = _compilationNodes->getMaxIndex() + 1;
return _nodeCount;
}
// define some variables to keep track of compilation time
TR_SingleTimer compTime;
TR_SingleTimer genILTime;
TR_SingleTimer optTime;
TR_SingleTimer codegenTime;
static const char *pHotnessNames[numHotnessLevels] =
{
"no-opt", // noOpt
"cold", // cold
"warm", // warm
"hot", // hot
"very-hot", // veryHot
"scorching", // scorching
"reducedWarm", //
"unknown", // unknownHotness
};
const char *
OMR::Compilation::getHotnessName(TR_Hotness h)
{
if (h < minHotness || h >= numHotnessLevels)
return "unknownHotness";
return pHotnessNames[h];
}
OMR::Compilation::Compilation(
int32_t id,
OMR_VMThread *omrVMThread,
TR_FrontEnd *fe,
TR_ResolvedMethod *compilee,
TR::IlGenRequest &ilGenRequest,
TR::Options &options,
TR::Region &heapMemoryRegion,
TR_Memory *m,
TR_OptimizationPlan *optimizationPlan,
TR::Environment *target) :
_signature(compilee->signature(m)),
_options(&options),
_heapMemoryRegion(heapMemoryRegion),
_trMemory(m),
_fe(fe),
_ilGenRequest(ilGenRequest),
_currentOptIndex(0),
_lastBegunOptIndex(0),
_lastPerformedOptIndex(0),
_currentOptSubIndex(0), // The transformation index within the current opt
_lastPerformedOptSubIndex(0),
_debug(0),
_knownObjectTable(NULL),
_omrVMThread(omrVMThread),
_allocator(TRCS2MemoryAllocator(m)),
_method(compilee),
_arenaAllocator(TR::Allocator(self()->allocator("Arena"))),
_aliasRegion(heapMemoryRegion),
_ilGenerator(0),
_ilValidator(NULL),
_optimizer(0),
_currentSymRefTab(NULL),
_recompilationInfo(0),
_optimizationPlan(optimizationPlan),
_primaryRandom(NULL),
_adhocRandom(NULL),
_methodSymbols(m, 10),
_resolvedMethodSymbolReferences(m),
_inlinedCallSites(m),
_inlinedCallStack(m),
_inlinedCallArgInfoStack(m),
_devirtualizedCalls(getTypedAllocator<TR_DevirtualizedCallInfo*>(self()->allocator())),
_inlinedCalls(0),
_inlinedFramesAdded(0),
_virtualGuards(getTypedAllocator<TR_VirtualGuard*>(self()->allocator())),
_staticPICSites(getTypedAllocator<TR::Instruction*>(self()->allocator())),
_staticHCRPICSites(getTypedAllocator<TR::Instruction*>(self()->allocator())),
_staticMethodPICSites(getTypedAllocator<TR::Instruction*>(self()->allocator())),
_snippetsToBePatchedOnClassUnload(getTypedAllocator<TR::Snippet*>(self()->allocator())),
_methodSnippetsToBePatchedOnClassUnload(getTypedAllocator<TR::Snippet*>(self()->allocator())),
_genILSyms(getTypedAllocator<TR::ResolvedMethodSymbol*>(self()->allocator())),
_returnInfo(TR_VoidReturn),
_visitCount(0),
_nodeCount(0),
_accurateNodeCount(0),
_lastValidNodeCount(0),
_maxInlineDepth(0),
_numLivePendingPushSlots(0),
_numNestingLevels(0),
_usesPreexistence(options.getOption(TR_ForceUsePreexistence)),
_loopVersionedWrtAsyncChecks(false),
_commitedCallSiteInfo(false),
_containsBigDecimalLoad(false),
_osrStateIsReliable(true),
_canAffordOSRControlFlow(true),
_osrInfrastructureRemoved(false),
_toNumberMap(self()->allocator("toNumberMap")),
_toStringMap(self()->allocator("toStringMap")),
_toCommentMap(self()->allocator("toCommentMap")),
_nextOptLevel(unknownHotness),
_errorCode(COMPILATION_SUCCEEDED),
_peekingArgInfo(m),
_peekingSymRefTab(NULL),
_checkcastNullChkInfo(getTypedAllocator<TR_Pair<TR_ByteCodeInfo, TR::Node> *>(self()->allocator())),
_nodesThatShouldPrefetchOffset(getTypedAllocator<TR_Pair<TR::Node,uint32_t> *>(self()->allocator())),
_extraPrefetchInfo(getTypedAllocator<TR_PrefetchInfo*>(self()->allocator())),
_debugCounterMap(std::less<const void *>(), getTypedAllocator<DebugCounterEntry>(self()->allocator())),
_currentBlock(NULL),
_verboseOptTransformationCount(0),
_relocatableMethodCodeStart(NULL),
_compThreadID(id),
_failCHtableCommitFlag(false),
_phaseTimer("Compilation", self()->allocator("phaseTimer"), self()->getOption(TR_Timing)),
_phaseMemProfiler("Compilation", self()->allocator("phaseMemProfiler"), self()->getOption(TR_LexicalMemProfiler)),
_compilationNodes(NULL),
_copyPropagationRematerializationCandidates(self()->allocator("CP rematerialization")),
_nodeOpCodeLength(0),
_prevSymRefTabSize(0),
_scratchSpaceLimit(TR::Options::_scratchSpaceLimit),
_cpuTimeAtStartOfCompilation(-1),
_ilVerifier(NULL),
_gpuPtxList(m),
_gpuKernelLineNumberList(m),
_gpuPtxCount(0),
_bitVectorPool(self()),
_typeLayoutMap((LayoutComparator()), LayoutAllocator(self()->region())),
_tlsManager(*self())
{
if (target != NULL)
{
_target = *target;
}
else
{
_target = TR::Compiler->target;
}
//Avoid expensive initialization and uneeded option checking if we are doing AOT Loads
if (_optimizationPlan && _optimizationPlan->getIsAotLoad())
{
#ifdef J9_PROJECT_SPECIFIC
_transientCHTable = NULL;
_metadataAssumptionList = NULL;
#endif
_symRefTab = NULL;
_methodSymbol = NULL;
_codeGenerator = NULL;
_recompilationInfo = NULL;
_globalRegisterCandidates = NULL;
_osrCompilationData = NULL;
return;
}
#ifdef J9_PROJECT_SPECIFIC
_transientCHTable = new (_trMemory->trHeapMemory()) TR_CHTable(_trMemory);
_metadataAssumptionList = NULL;
#endif
_symRefTab = new (_trMemory->trHeapMemory()) TR::SymbolReferenceTable(_method->maxBytecodeIndex(), self());
_compilationNodes = new (_trMemory->trHeapMemory()) TR::NodePool(self());
#ifdef J9_PROJECT_SPECIFIC
// The following must stay before the first assumption gets created which could happen
// while the PersistentMethodInfo is allocated during codegen creation
// Access to this list must be performed with assumptionTableMutex in hand
//
if (!options.getOption(TR_DisableFastAssumptionReclamation))
_metadataAssumptionList = new (m->trPersistentMemory()) TR::SentinelRuntimeAssumption();
#endif
//Random fields must be set before allocating codegen
_primaryRandom = new (m->trHeapMemory()) TR_RandomGenerator(options.getRandomSeed());
_adhocRandom = new (m->trHeapMemory()) TR_RandomGenerator(options.getRandomSeed());
if (options.getOption(TR_RandomSeedSignatureHash))
{
uint32_t hash = 0;
for (const char *c = self()->signature(); *c; c++)
hash = 33*hash + (uint32_t)(*c);
uint32_t seed = _options->getRandomSeed();
seed ^= hash;
_primaryRandom->setSeed(seed);
_adhocRandom->setSeed(_primaryRandom->getRandom());
}
if (ilGenRequest.details().isMethodInProgress())
{
_flags.set(IsDLTCompile);
options.setAllowRecompilation(false);
}
if (optimizationPlan)
{
if (optimizationPlan->isGPUCompilation())
_flags.set(IsGPUCompilation);
if (optimizationPlan->isGPUCompileCPUCode())
_flags.set(IsGPUCompileCPUCode);
}
// if we are not in the selective NoOptServer mode
_isOptServer = (!options.getOption(TR_NoOptServer)) &&
( options.getOption(TR_Server)
#ifdef J9_PROJECT_SPECIFIC
|| (self()->getPersistentInfo()->getNumLoadedClasses() >= TR::Options::_bigAppThreshold)
#endif
);
_isServerInlining = !options.getOption(TR_NoOptServer);
// TR_DisableInternalPointers must be set before the TR::CodeGenerator object is created because
// CodeGenerator's _disableInternalPointers member is set in its constructor and this is one of
// options that is checked for
if (_isOptServer)
{
if(self()->getMethodHotness() <= warm)
{
self()->setOption(TR_DisableInternalPointers);
}
}
//_methodSymbol must be done after symRefTab, but before codegen
// _methodSymbol must be initialized here because creating a jitted method symbol
// actually inspects TR::comp()->_methodSymbol (to compare against the new object)
_methodSymbol = TR::ResolvedMethodSymbol::createJittedMethodSymbol(self()->trHeapMemory(), compilee, self());
// initPersistentCPUField and createOpCode must be done after method symbol creation
if (self()->getOption(TR_EnableNodeGC))
{
self()->getNodePool().enableNodeGC();
}
if (self()->getOption(TR_ForceGenerateReadOnlyCode))
{
self()->setGenerateReadOnlyCode();
}
//codegen also needs _methodSymbol
_codeGenerator = TR::CodeGenerator::create(self());
_recompilationInfo = _codeGenerator->getSupportsRecompilation() ? _codeGenerator->allocateRecompilationInfo() : NULL;
_globalRegisterCandidates = new (self()->trHeapMemory()) TR_RegisterCandidates(self());
#ifdef J9_PROJECT_SPECIFIC
if (_recompilationInfo && options.getOptLevelDowngraded())
_recompilationInfo->getMethodInfo()->setOptLevelDowngraded(true);
#endif
static bool firstTime = true;
if (firstTime)
{
firstTime = false;
TR::ILOpCode::checkILOpArrayLengths();
#ifdef J9_PROJECT_SPECIFIC
TR_ASSERT(TR::DataType::getMaxPackedDecimalSize() == TR::DataType::packedDecimalPrecisionToByteLength(TR_MAX_DECIMAL_PRECISION),
"TR::DataType::getMaxPackedDecimalSize() (%d) does not agree with precToSize(TR_MAX_DECIMAL_PRECISION) (%d)\n",
TR::DataType::getMaxPackedDecimalSize(), TR::DataType::packedDecimalPrecisionToByteLength(TR_MAX_DECIMAL_PRECISION));
#endif
}
static const char *enableOSRAtAllOptLevels = feGetEnv("TR_EnableOSRAtAllOptLevels");
// If the outermost method is native, OSR is not supported
if (_methodSymbol->isNative())
self()->setOption(TR_DisableOSR);
// Do not default OSR on if:
// NextGenHCR is disabled, as it is enabled for it
// OSR is explicitly disabled
// FSD is enabled, as HCR cannot be enabled with it
// HCR has not been enabled
if (!self()->getOption(TR_DisableNextGenHCR) && !self()->getOption(TR_DisableOSR) && !self()->getOption(TR_FullSpeedDebug) && self()->getOption(TR_EnableHCR))
{
self()->setOption(TR_EnableOSR); // OSR must be enabled for NextGenHCR
}
if (self()->isDLT() || (((self()->getMethodHotness() < warm) || self()->compileRelocatableCode() || (self()->isProfilingCompilation() && self()->getProfilingMode() != JProfiling)) && !enableOSRAtAllOptLevels && !_options->getOption(TR_FullSpeedDebug)))
{
self()->setOption(TR_DisableOSR);
_options->setOption(TR_EnableOSR, false);
_options->setOption(TR_EnableOSROnGuardFailure, false);
}
if (options.getOption(TR_EnableOSR))
{
// Current implementation of partial inlining will break OSR
self()->setOption(TR_DisablePartialInlining);
//TODO: investigate the memory footprint of this allocation
_osrCompilationData = new (self()->trHeapMemory()) TR_OSRCompilationData(self());
if (((self()->getMethodHotness() < warm) || self()->compileRelocatableCode() || self()->isProfilingCompilation()) && !enableOSRAtAllOptLevels && !options.getOption(TR_FullSpeedDebug)) // Off for two reasons : 1) not sure if we can afford the increase in compile time due to the extra OSR control flow at cold and 2) not sure at this stage in 727 whether OSR can work with AOT (will try to find out soon) but disabling till I do find out
_canAffordOSRControlFlow = false;
}
else
_osrCompilationData = NULL;
}
OMR::Compilation::~Compilation() throw()
{
}
TR::KnownObjectTable *
OMR::Compilation::getOrCreateKnownObjectTable()
{
_knownObjectTable = NULL;
return _knownObjectTable;
}
void
OMR::Compilation::freeKnownObjectTable()
{
_knownObjectTable = NULL;
}
int32_t
OMR::Compilation::maxInternalPointers()
{
return 0;
}
bool
OMR::Compilation::isOutermostMethod()
{
if ((self()->getInlineDepth() != 0) || self()->isPeekingMethod())
return false;
return true;
}
bool
OMR::Compilation::ilGenTrace()
{
if (self()->isOutermostMethod() || self()->getOption(TR_DebugInliner) || self()->trace(OMR::inlining))
return true;
return false;
}
int32_t
OMR::Compilation::getOptLevel()
{
return _options->getOptLevel();
}
bool
OMR::Compilation::allocateAtThisOptLevel()
{
return self()->getOptLevel() > warm;
}
TR::PersistentInfo *
OMR::Compilation::getPersistentInfo()
{
return self()->trPersistentMemory()->getPersistentInfo();
}
int32_t
OMR::Compilation::getMaxAliasIndex()
{
return self()->getSymRefCount();
}
bool
OMR::Compilation::isPeekingMethod()
{
return self()->getCurrentSymRefTab() != 0;
}
TR_Hotness
OMR::Compilation::getMethodHotness()
{
return (TR_Hotness) self()->getOptLevel();
}
ncount_t
OMR::Compilation::getAccurateNodeCount()
{
self()->generateAccurateNodeCount();
return _accurateNodeCount;
}
const char *
OMR::Compilation::getHotnessName()
{
return TR::Compilation::getHotnessName(self()->getMethodHotness());
}
bool OMR::Compilation::canAffordOSRControlFlow()
{
if (self()->getOption(TR_DisableOSR) || !self()->getOption(TR_EnableOSR))
{
return false;
}
if (self()->osrInfrastructureRemoved())
{
return false;
}
return _canAffordOSRControlFlow;
}
void OMR::Compilation::setSeenClassPreventingInducedOSR()
{
if (_osrCompilationData)
_osrCompilationData->setSeenClassPreventingInducedOSR();
}
bool OMR::Compilation::supportsInduceOSR()
{
if (_osrInfrastructureRemoved)
{
if (self()->getOption(TR_TraceOSR))
traceMsg(self(), "OSR induction cannot be performed after OSR infrastructure has been removed\n");
return false;
}
if (!self()->canAffordOSRControlFlow())
{
if (self()->getOption(TR_TraceOSR))
traceMsg(self(), "canAffordOSRControlFlow is false - OSR induction is not supported\n");
return false;
}
if (self()->getOption(TR_MimicInterpreterFrameShape) && !self()->getOption(TR_FullSpeedDebug)/* && areSlotsSharedByRefAndNonRef() */)
{
if (self()->getOption(TR_TraceOSR))
traceMsg(self(), "MimicInterpreterFrameShape is set - OSR induction is not supported\n");
return false;
}
if (self()->isDLT() /* && getJittedMethodSymbol()->sharesStackSlots(self()) */)
{
if (self()->getOption(TR_TraceOSR))
traceMsg(self(), "DLT compilation - OSR induction is not supported\n");
return false;
}
if (_osrCompilationData && _osrCompilationData->seenClassPreventingInducedOSR())
{
if (self()->getOption(TR_TraceOSR))
traceMsg(self(), "Cannot guarantee OSR transfer of control to the interpreter will work for calls preventing induced OSR (e.g. Quad) because of differences in JIT vs interpreter representations\n");
return false;
}
return true;
}
bool OMR::Compilation::penalizePredsOfOSRCatchBlocksInGRA()
{
if (!self()->getOption(TR_EnableOSR))
return false;
if (self()->getOption(TR_FullSpeedDebug))
return false;
return true;
}
bool OMR::Compilation::isShortRunningMethod(int32_t callerIndex)
{
return false;
}
bool OMR::Compilation::isPotentialOSRPoint(TR::Node *node, TR::Node **osrPointNode, bool ignoreInfra)
{
static char *disableAsyncCheckOSR = feGetEnv("TR_disableAsyncCheckOSR");
static char *disableGuardedCallOSR = feGetEnv("TR_disableGuardedCallOSR");
static char *disableMonentOSR = feGetEnv("TR_disableMonentOSR");
bool potentialOSRPoint = false;
if (self()->isOSRTransitionTarget(TR::postExecutionOSR))
{
if (node->getOpCodeValue() == TR::treetop || node->getOpCode().isCheck())
node = node->getFirstChild();
if (_osrInfrastructureRemoved && !ignoreInfra)
potentialOSRPoint = false;
else if (node->getOpCodeValue() == TR::asynccheck)
{
if (disableAsyncCheckOSR == NULL)
potentialOSRPoint = !self()->isShortRunningMethod(node->getByteCodeInfo().getCallerIndex());
}
else if (node->getOpCode().isCall())
{
TR::SymbolReference *callSymRef = node->getSymbolReference();
if (node->isPotentialOSRPointHelperCall())
{
potentialOSRPoint = true;
}
else if (callSymRef->getReferenceNumber() >=
self()->getSymRefTab()->getNonhelperIndex(self()->getSymRefTab()->getLastCommonNonhelperSymbol())
&& !((TR::MethodSymbol*)(callSymRef->getSymbol()))->functionCallDoesNotYieldOSR())
{
potentialOSRPoint = (disableGuardedCallOSR == NULL);
}
}
else if (node->getOpCodeValue() == TR::monent)
potentialOSRPoint = (disableMonentOSR == NULL);
}
else if (node->canGCandReturn())
potentialOSRPoint = true;
else if (self()->getOSRMode() == TR::involuntaryOSR && node->canGCandExcept())
potentialOSRPoint = true;
if (osrPointNode && potentialOSRPoint)
(*osrPointNode) = node;
return potentialOSRPoint;
}
bool OMR::Compilation::isPotentialOSRPointWithSupport(TR::TreeTop *tt)
{
TR::Node *osrNode;
bool potentialOSRPoint = self()->isPotentialOSRPoint(tt->getNode(), &osrNode);
if (potentialOSRPoint && self()->getOSRMode() == TR::voluntaryOSR)
{
if (self()->isOSRTransitionTarget(TR::postExecutionOSR) && tt->getNode() != osrNode)
{
// The OSR point applies where the node is anchored, rather than where it may
// be commoned. Therefore, it is necessary to check if the node is anchored under
// a prior treetop.
if (osrNode->getReferenceCount() > 1)
{
TR::TreeTop *cursor = tt->getPrevTreeTop();
while (cursor)
{
if ((cursor->getNode()->getOpCode().isCheck() || cursor->getNode()->getOpCodeValue() == TR::treetop)
&& cursor->getNode()->getFirstChild() == osrNode)
{
potentialOSRPoint = false;
break;
}
if (cursor->getNode()->getOpCodeValue() == TR::BBStart &&
!cursor->getNode()->getBlock()->isExtensionOfPreviousBlock())
break;
cursor = cursor->getPrevTreeTop();
}
}
}
if (potentialOSRPoint)
{
TR_ByteCodeInfo &bci = osrNode->getByteCodeInfo();
TR::ResolvedMethodSymbol *method = bci.getCallerIndex() == -1 ?
self()->getMethodSymbol() : self()->getInlinedResolvedMethodSymbol(bci.getCallerIndex());
potentialOSRPoint = method->supportsInduceOSR(bci, tt->getEnclosingBlock(), self(), false);
}
}
return potentialOSRPoint;
}
/*
* OSR can operate in two modes, voluntary and involuntary.
*
* In involuntary OSR, the JITed code does not control when an OSR transition occurs. It can be
* initiated externally at any potential OSR point.
*
* In voluntary OSR, the JITed code does control when an OSR transition occurs, allowing it to
* limit the OSR points with transitions.
*/
TR::OSRMode
OMR::Compilation::getOSRMode()
{
if (self()->getOption(TR_FullSpeedDebug))
return TR::involuntaryOSR;
return TR::voluntaryOSR;
}
/*
* The OSR transition destination may be before or after the OSR point.
* When located before, the transition will target the bytecode index of
* the OSR point, whilst those located after may have an offset bytecode
* index.
*/
TR::OSRTransitionTarget
OMR::Compilation::getOSRTransitionTarget()
{
TR::OSRTransitionTarget target = TR::disableOSR;
// Under NextGenHCR, transitions will occur after the OSR points
// Otherwise, the default is before
if (self()->getHCRMode() == TR::osr)
{
target = TR::postExecutionOSR;
// If OSROnGuardFailure is enabled, transitions will also occur before
if (self()->getOption(TR_EnableOSROnGuardFailure))
target = TR::preAndPostExecutionOSR;
}
else if (self()->getOption(TR_EnableOSR))
target = TR::preExecutionOSR;
return target;
}
bool
OMR::Compilation::isOSRTransitionTarget(TR::OSRTransitionTarget target)
{
return (target & self()->getOSRTransitionTarget()) != 0;
}
/*
* Provides the bytecode offset between the OSR point and the destination
* of the transition. Only used when doing postExecutionOSR to indicate
* the appropriate bytecode index after the OSR point.
*/
int32_t
OMR::Compilation::getOSRInductionOffset(TR::Node *node)
{
// If no induction after the OSR point, offset must be 0
if (!self()->isOSRTransitionTarget(TR::postExecutionOSR))
return 0;
TR::Node *osrNode;
if (!self()->isPotentialOSRPoint(node, &osrNode))
{
TR_ASSERT(0, "getOSRInductionOffset should only be called on OSR points");
}
if (osrNode->isPotentialOSRPointHelperCall())
{
return osrNode->getOSRInductionOffset();
}
if (osrNode->getOpCode().isCall())
return 3;
// If the monent has a bytecode index of 0, it must be the
// monent for a synchronized method. A transition here
// must target the method entry.
if (osrNode->getOpCodeValue() == TR::monent)
{
if (osrNode->getByteCodeIndex() == 0)
return 0;
else
return 1;
}
if (osrNode->getOpCodeValue() == TR::asynccheck)
return 0;
TR_ASSERT(0, "OSR points should only be calls, monents or asyncchecks");
return 0;
}
/*
* An OSR analysis point is used only for OSRDefAnalysis
* and will not become a transition point. It is required
* for certain OSR points when doing postExecutionOSR.
* For example, liveness data must be know before an inlined
* call, to reconstruct the caller's frame, but the transition
* can only occur after the call.
*
* An analysis point does not have an induction offset.
*/
bool
OMR::Compilation::requiresAnalysisOSRPoint(TR::Node *node)
{
// If no induction after the OSR point, cannot use analysis point
if (!self()->isOSRTransitionTarget(TR::postExecutionOSR))
return false;
TR::Node *osrNode;
if (!self()->isPotentialOSRPoint(node, &osrNode))
{
TR_ASSERT(0, "requiresAnalysisOSRPoint should only be called on OSR points\n");
return false;
}
// Calls require an analysis and transition point as liveness may change across them
if (osrNode->getOpCode().isCall())
return true;
switch (osrNode->getOpCodeValue())
{
// Monents only require a trailing OSR point as they will perform OSR when executing the
// monitor and there is no change in liveness due to the monent
case TR::monent:
// Asyncchecks will not modify liveness
case TR::asynccheck:
return false;
default:
TR_ASSERT(0, "OSR points should only be calls, monents or asyncchecks");
return false;
}
}
/**
* To reduce OSR overhead, OSRLiveRangeAnalysis supports solving liveness analysis
* during IlGen, as an approximation of this information is commonly known at this
* stage.
*
* If this function returns true, OSRLiveRangeAnalysis expects pending push liveness
* information to be stashed in OSRData using addPendingPushLivenessInfo prior to
* its execution in IlGenOpts. Returning true without the correct information stashed
* will result in reduced performance and failed OSR transitions.
*
* If this function returns false, OSRLiveRangeAnalysis will perform liveness analysis
* on pending push symbols.
*/
bool
OMR::Compilation::pendingPushLivenessDuringIlgen()
{
return false;
}
/**
* A profiling compilation will include instrumentation to collect information
* on block and value frequencies. isProfilingCompilation() should return true for
* such a compilation and getProfilingMode() can distinguish between the profiling
* implementations.
*/
bool
OMR::Compilation::isProfilingCompilation()
{
return _recompilationInfo ? _recompilationInfo->isProfilingCompilation() : false;
}
ProfilingMode
OMR::Compilation::getProfilingMode()
{
if (!self()->isProfilingCompilation())
return DisabledProfiling;
if (self()->getOption(TR_EnableJProfiling) || !self()->getOption(TR_DisableJProfilingInProfilingCompilations))
return JProfiling;
return JitProfiling;
}
bool
OMR::Compilation::isJProfilingCompilation()
{
return false;
}
#if defined(AIXPPC) || defined(LINUX) || defined(J9ZOS390) || defined(OMR_OS_WINDOWS)
static void stopBeforeCompile()
{
static int first = 1;
// only print the following message once
if (first)
{
printf("stopBeforeCompile is a dummy routine.\n");
first = 0;
}
}
#endif /* defined(AIXPPC) || defined(LINUX) || defined(J9ZOS390) || defined(OMR_OS_WINDOWS) */
static int32_t strHash(const char *str)
{
// The string hash from Java
int32_t result = 0;
for (const unsigned char *s = reinterpret_cast<const unsigned char*>(str); *s; s++)
result = result * 33 + *s;
return result;
}
int32_t OMR::Compilation::compile()
{
if (!self()->getOption(TR_DisableSupportForCpuSpentInCompilation))
_cpuTimeAtStartOfCompilation = TR::Compiler->vm.cpuTimeSpentInCompilationThread(self());
bool printCodegenTime = self()->getOption(TR_CummTiming);
if (self()->isOptServer())
self()->setOption(TR_DisablePartialInlining);
#ifdef J9_PROJECT_SPECIFIC
if (self()->getOptions()->getDelayCompile())
{
uint64_t limit = (uint64_t)self()->getOptions()->getDelayCompile();
uint64_t starttime = self()->getPersistentInfo()->getElapsedTime();
fprintf(stderr,"\nDelayCompile: Starting a delay of length %" OMR_PRIu64 " for method %s at time %" OMR_PRIu64 ".", limit, self()->signature(), starttime);
fflush(stderr);
uint64_t temp=0;
while(1)
{
temp = self()->getPersistentInfo()->getElapsedTime();
if( ( temp - starttime ) > limit)
{
fprintf(stderr,"\nDelayCompile: Finished delay at time = %" OMR_PRIu64 ", elapsed time = %" OMR_PRIu64 "\n", temp, (temp - starttime));
break;
}
}
}
self()->setGetImplInlineable(self()->fej9()->isGetImplInliningSupported());
#endif
if (self()->getOption(TR_BreakBeforeCompile))
{
fprintf(stderr, "\n=== About to compile %s ===\n", self()->signature());
TR::Compiler->debug.breakPoint();
}
#if defined(AIXPPC)
if (self()->getOption(TR_DebugBeforeCompile))
{
self()->getDebug()->setupDebugger((void *) *((long*)&(stopBeforeCompile)));
stopBeforeCompile();
}
#elif defined(LINUX) || defined(J9ZOS390) || defined(OMR_OS_WINDOWS)
if (self()->getOption(TR_DebugBeforeCompile))
{
#if defined(LINUXPPC64)
self()->getDebug()->setupDebugger((void *) *((long*)&(stopBeforeCompile)),(void *) *((long*)&(stopBeforeCompile)), true);
#else
self()->getDebug()->setupDebugger((void *) &stopBeforeCompile,(void *) &stopBeforeCompile,true);
#endif /* defined(LINUXPPC64) */
stopBeforeCompile();
}
#endif /* defined(AIXPPC) */
if (self()->getOutFile() != NULL && (self()->getOption(TR_TraceAll) || debug("traceStartCompile") || self()->getOption(TR_Timing)))
{
self()->getDebug()->printHeader();
static char *randomExercisePeriodStr = feGetEnv("TR_randomExercisePeriod");
if (self()->getOption(TR_Randomize) || randomExercisePeriodStr != NULL)
traceMsg(self(), "Random seed is %d%s\n", _options->getRandomSeed(), self()->getOption(TR_RandomSeedSignatureHash)? " hashed with signature":"");
if (randomExercisePeriodStr != NULL)
{
auto period = atoi(randomExercisePeriodStr);
if (period > 0)
TR_RandomGenerator::exercise(period, self());
}
}
if (printCodegenTime) compTime.startTiming(self());
if (_recompilationInfo)