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Aliases.cpp
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Aliases.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 <assert.h>
#include <stddef.h>
#include <stdint.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 "env/KnownObjectTable.hpp"
#include "env/PersistentInfo.hpp"
#include "env/TRMemory.hpp"
#include "env/jittypes.h"
#include "il/AliasSetInterface.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/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/Assert.hpp"
#include "infra/BitVector.hpp"
#include "infra/Flags.hpp"
#include "infra/List.hpp"
#include "runtime/Runtime.hpp"
#ifdef J9_PROJECT_SPECIFIC
#include "control/RecompilationInfo.hpp"
#include "env/CHTable.hpp"
#include "env/PersistentCHTable.hpp"
#include "runtime/RuntimeAssumptions.hpp"
#endif
class TR_OpaqueClassBlock;
namespace TR { class Register; }
#define PEEK_THRESHOLD 50
#ifdef J9_PROJECT_SPECIFIC
static TR_BitVector * addVeryRefinedCallAliasSets(TR::ResolvedMethodSymbol *, TR_BitVector *, List<void> *);
#endif
OMR::SymbolReference::SymbolReference(TR::SymbolReferenceTable * symRefTab, TR::SymbolReference& sr, intptr_t o, TR::KnownObjectTable::Index knownObjectIndex)
{
_referenceNumber = symRefTab->assignSymRefNumber(self());
_symbol = sr._symbol;
_offset = sr._offset + o;
_owningMethodIndex = sr._owningMethodIndex;
_cpIndex = sr._cpIndex;
_unresolvedIndex = sr._unresolvedIndex;
_extraInfo = 0;
_flags.set(sr._flags);
_useDefAliases = NULL;
_knownObjectIndex = knownObjectIndex;
self()->copyAliasSets(&sr, symRefTab);
symRefTab->aliasBuilder.updateSubSets(self());
}
void
OMR::SymbolReference::copyAliasSets(TR::SymbolReference * fromSymRef, TR::SymbolReferenceTable * symRefTab)
{
_useDefAliases = fromSymRef->_useDefAliases;
}
TR_BitVector *
OMR::SymbolReference::getUseonlyAliasesBV(TR::SymbolReferenceTable * symRefTab)
{
int32_t kind = _symbol->getKind();
switch (kind)
{
case TR::Symbol::IsMethod:
{
TR::MethodSymbol * methodSymbol = _symbol->castToMethodSymbol();
// Aliasing for potentialOSRPointHelper
// A potentialOSRPointHelper call is an exception point that may go to OSR catch block ( see
// Node API exceptionsRaised), the control flow constraint imposed by the exception edge will
// apply to all the global optimizations that may move things around. Local optimizations also
// ask exceptionsRaised to determine if a code motion across certain point is safe. So aliasing
// is not necessary. However, we'd like to add aliasing here to cause the compiler to be more
// conservative about reordering this helper with other operations. The aliasing can always be
// relaxed when necessary.
//
if (symRefTab->isNonHelper(self(), TR::SymbolReferenceTable::potentialOSRPointHelperSymbol))
{
return &symRefTab->aliasBuilder.defaultMethodUseAliases();
}
// Aliasing for osrFearPointHelper
// Preventing the reordering of fear point helper w.r.t. OSR points and yield/invalidation points is
// the minimum requirement of aliasing for OSR fear point helper. These reorderings would in almost
// all cases be naturally disallowed simply due to the fact that the fear point is represented as a
// call, which even without aliasing could e.g. perform I/O. Thus the following is a highly conservative
// aliasing and can be relaxed later when necessary
//
if (symRefTab->isNonHelper(self(), TR::SymbolReferenceTable::osrFearPointHelperSymbol))
{
return &symRefTab->aliasBuilder.defaultMethodUseAliases();
}
// Aliases for eaEscapeHelper
// Ensure EA sees the method as causing an escape for all arguments passed
if (symRefTab->isNonHelper(self(), TR::SymbolReferenceTable::eaEscapeHelperSymbol))
{
return &symRefTab->aliasBuilder.defaultMethodUseAliases();
}
if (symRefTab->isNonHelper(self(), TR::SymbolReferenceTable::objectEqualityComparisonSymbol)
|| symRefTab->isNonHelper(self(), TR::SymbolReferenceTable::objectInequalityComparisonSymbol))
{
return &symRefTab->aliasBuilder.defaultMethodUseAliases();
}
if (symRefTab->isNonHelper(self(), TR::SymbolReferenceTable::nonNullableArrayNullStoreCheckSymbol))
{
return &symRefTab->aliasBuilder.defaultMethodUseAliases();
}
if (!methodSymbol->isHelper())
{
return &symRefTab->aliasBuilder.defaultMethodUseAliases();
}
switch (self()->getReferenceNumber())
{
case TR_asyncCheck:
return 0;
// helpers that don't throw have no use aliases
case TR_instanceOf:
case TR_checkAssignable:
case TR_monitorEntry:
case TR_transactionEntry:
case TR_reportFinalFieldModified:
case TR_reportMethodEnter:
case TR_reportStaticMethodEnter:
case TR_reportMethodExit:
case TR_acquireVMAccess:
case TR_throwCurrentException:
case TR_releaseVMAccess:
case TR_stackOverflow:
case TR_writeBarrierStore:
case TR_writeBarrierStoreGenerational:
case TR_writeBarrierStoreGenerationalAndConcurrentMark:
case TR_writeBarrierBatchStore:
case TR_typeCheckArrayStore:
case TR_arrayStoreException:
case TR_arrayBoundsCheck:
case TR_checkCast:
case TR_divCheck:
case TR_overflowCheck:
case TR_nullCheck:
case TR_methodTypeCheck:
case TR_incompatibleReceiver:
case TR_IncompatibleClassChangeError:
case TR_aThrow:
case TR_aNewArray:
case TR_monitorExit:
case TR_transactionExit:
case TR_newObject:
case TR_newObjectNoZeroInit:
case TR_acmpeqHelper:
case TR_acmpneHelper:
case TR_newValue:
case TR_newValueNoZeroInit:
case TR_newArray:
case TR_multiANewArray:
default:
return &symRefTab->aliasBuilder.defaultMethodUseAliases();
}
}
case TR::Symbol::IsResolvedMethod:
{
#ifdef J9_PROJECT_SPECIFIC
TR::ResolvedMethodSymbol * resolvedMethodSymbol = _symbol->castToResolvedMethodSymbol();
if (!TR::comp()->getOption(TR_EnableHCR))
{
switch (resolvedMethodSymbol->getRecognizedMethod())
{
case TR::java_lang_Double_longBitsToDouble:
case TR::java_lang_Double_doubleToLongBits:
case TR::java_lang_Float_intBitsToFloat:
case TR::java_lang_Float_floatToIntBits:
case TR::java_lang_Double_doubleToRawLongBits:
case TR::java_lang_Float_floatToRawIntBits:
case TR::java_lang_Math_sqrt:
case TR::java_lang_StrictMath_sqrt:
case TR::java_lang_Math_sin:
case TR::java_lang_StrictMath_sin:
case TR::java_lang_Math_cos:
case TR::java_lang_StrictMath_cos:
case TR::java_lang_Math_max_I:
case TR::java_lang_Math_min_I:
case TR::java_lang_Math_max_L:
case TR::java_lang_Math_min_L:
case TR::java_lang_Math_abs_I:
case TR::java_lang_Math_abs_L:
case TR::java_lang_Math_abs_F:
case TR::java_lang_Math_abs_D:
case TR::java_lang_Math_pow:
case TR::java_lang_StrictMath_pow:
case TR::java_lang_Math_exp:
case TR::java_lang_StrictMath_exp:
case TR::java_lang_Math_log:
case TR::java_lang_StrictMath_log:
case TR::java_lang_Math_floor:
case TR::java_lang_Math_ceil:
case TR::java_lang_Math_copySign_F:
case TR::java_lang_Math_copySign_D:
case TR::java_lang_StrictMath_floor:
case TR::java_lang_StrictMath_ceil:
case TR::java_lang_StrictMath_copySign_F:
case TR::java_lang_StrictMath_copySign_D:
return NULL;
default:
break;
}
}
#endif
return &symRefTab->aliasBuilder.defaultMethodUseAliases();
}
case TR::Symbol::IsAutomatic:
case TR::Symbol::IsParameter:
if (symRefTab->aliasBuilder.catchLocalUseSymRefs().isSet(self()->getReferenceNumber()))
return &symRefTab->aliasBuilder.methodsThatMayThrow();
return 0;
default:
//TR_ASSERT(0, "getUseOnlyAliases: unexpected symbol kind ");
return 0;
}
}
TR_BitVector *
OMR::SymbolReference::getUseDefAliasesBV(bool isDirectCall, bool includeGCSafePoint)
{
TR::Compilation *comp = TR::comp();
TR::Region &aliasRegion = comp->aliasRegion();
int32_t bvInitialSize = comp->getSymRefCount();
TR_BitVectorGrowable growability = growable;
// allow more than one shadow for an array type. Used by LoopAliasRefiner
const bool supportArrayRefinement=true;
int32_t kind = _symbol->getKind();
TR::SymbolReferenceTable * symRefTab = comp->getSymRefTab();
// !!! NOTE !!!
// THERE IS A COPY OF THIS LOGIC IN sharesSymbol
//
if (!self()->reallySharesSymbol(comp))
{
switch (kind)
{
case TR::Symbol::IsShadow:
case TR::Symbol::IsStatic:
{
// For unresolved constant dynamic, we need to invoke a Java bootstrap method,
// which can have arbitrary side effects, so the aliasing should be conservative here.
// isConstObjectRef now returns true for condy, so we add an explicit condition,
// more like a short-circuit, to say if we are unresolved and not isConstObjectRef
// (this is the same as before), or if we are unresolved and condy
// (this is the extra condition added), we would return conservative aliases.
if ((self()->isUnresolved() && (_symbol->isConstantDynamic() || !_symbol->isConstObjectRef())) ||
_symbol->isVolatile() || self()->isLiteralPoolAddress() ||
self()->isFromLiteralPool() || _symbol->isUnsafeShadowSymbol() ||
(_symbol->isArrayShadowSymbol() && comp->getMethodSymbol()->hasVeryRefinedAliasSets()))
{
// getUseDefAliases might not return NULL
}
else if (!symRefTab->aliasBuilder.mutableGenericIntShadowHasBeenCreated())
{
// getUseDefAliases must return NULL
return NULL;
}
else if (kind == TR::Symbol::IsStatic && !symRefTab->aliasBuilder.litPoolGenericIntShadowHasBeenCreated())
{
// getUseDefAliases must return NULL
return NULL;
}
break;
}
}
}
// now do stuff for various kinds of symbols
//
switch (kind)
{
case TR::Symbol::IsMethod:
{
TR::MethodSymbol * methodSymbol = _symbol->castToMethodSymbol();
if (!methodSymbol->isHelper())
return symRefTab->aliasBuilder.methodAliases(self());
if (symRefTab->isNonHelper(self(), TR::SymbolReferenceTable::arraySetSymbol) ||
symRefTab->isNonHelper(self(), TR::SymbolReferenceTable::osrFearPointHelperSymbol) ||
symRefTab->isNonHelper(self(), TR::SymbolReferenceTable::potentialOSRPointHelperSymbol) ||
symRefTab->isNonHelper(self(), TR::SymbolReferenceTable::eaEscapeHelperSymbol) ||
symRefTab->isNonHelper(self(), TR::SymbolReferenceTable::objectEqualityComparisonSymbol) ||
symRefTab->isNonHelper(self(), TR::SymbolReferenceTable::objectInequalityComparisonSymbol) ||
symRefTab->isNonHelper(self(), TR::SymbolReferenceTable::nonNullableArrayNullStoreCheckSymbol))
{
return &symRefTab->aliasBuilder.defaultMethodDefAliases();
}
if (symRefTab->isNonHelper(self(), TR::SymbolReferenceTable::arrayCmpSymbol))
return 0;
switch (self()->getReferenceNumber())
{
case TR_methodTypeCheck:
case TR_nullCheck:
return &symRefTab->aliasBuilder.defaultMethodDefAliasesWithoutImmutable();
case TR_arrayBoundsCheck:
case TR_checkCast:
case TR_divCheck:
case TR_typeCheckArrayStore:
case TR_arrayStoreException:
case TR_incompatibleReceiver:
case TR_IncompatibleClassChangeError:
case TR_reportFinalFieldModified:
case TR_reportMethodEnter:
case TR_reportStaticMethodEnter:
case TR_reportMethodExit:
case TR_acquireVMAccess:
case TR_instanceOf:
case TR_checkAssignable:
case TR_throwCurrentException:
case TR_releaseVMAccess:
case TR_stackOverflow:
case TR_writeBarrierStore:
case TR_writeBarrierBatchStore:
case TR_jitProfileAddress:
case TR_jitProfileWarmCompilePICAddress:
case TR_jitProfileValue:
case TR_jitProfileLongValue:
case TR_jitProfileBigDecimalValue:
case TR_jitProfileParseBuffer:
return 0;
case TR_asyncCheck:
case TR_writeBarrierClassStoreRealTimeGC:
case TR_writeBarrierStoreRealTimeGC:
case TR_aNewArray:
case TR_acmpeqHelper:
case TR_acmpneHelper:
case TR_newValue:
case TR_newValueNoZeroInit:
case TR_newObject:
case TR_newObjectNoZeroInit:
case TR_newArray:
case TR_multiANewArray:
if ((comp->generateArraylets() || comp->isDLT()) && includeGCSafePoint)
return &symRefTab->aliasBuilder.gcSafePointSymRefNumbers();
else
return 0;
case TR_aThrow:
return 0;
// The monitor exit symbol needs to be aliased with all fields in the
// current class to ensure that all references to fields are evaluated
// before the monitor exit
case TR_monitorExit:
case TR_monitorEntry:
case TR_transactionExit:
case TR_transactionEntry:
default:
// The following is the place to check for
// a use of killsAllMethodSymbolRef... However,
// it looks like the default action is sufficient.
//if (symRefTab->findKillsAllMethodSymbolRef() == self())
// {
// }
return &symRefTab->aliasBuilder.defaultMethodDefAliases();
}
}
case TR::Symbol::IsResolvedMethod:
{
#ifdef J9_PROJECT_SPECIFIC
TR::ResolvedMethodSymbol * resolvedMethodSymbol = _symbol->castToResolvedMethodSymbol();
if (!comp->getOption(TR_EnableHCR))
{
switch (resolvedMethodSymbol->getRecognizedMethod())
{
case TR::java_lang_System_arraycopy:
{
TR_BitVector * aliases = new (aliasRegion) TR_BitVector(bvInitialSize, aliasRegion, growability);
*aliases |= symRefTab->aliasBuilder.arrayElementSymRefs();
if (comp->generateArraylets())
*aliases |= symRefTab->aliasBuilder.arrayletElementSymRefs();
return aliases;
}
if (resolvedMethodSymbol->isPureFunction())
return NULL;
case TR::java_lang_Double_longBitsToDouble:
case TR::java_lang_Double_doubleToLongBits:
case TR::java_lang_Float_intBitsToFloat:
case TR::java_lang_Float_floatToIntBits:
case TR::java_lang_Double_doubleToRawLongBits:
case TR::java_lang_Float_floatToRawIntBits:
case TR::java_lang_Math_sqrt:
case TR::java_lang_StrictMath_sqrt:
case TR::java_lang_Math_sin:
case TR::java_lang_StrictMath_sin:
case TR::java_lang_Math_cos:
case TR::java_lang_StrictMath_cos:
case TR::java_lang_Math_max_I:
case TR::java_lang_Math_min_I:
case TR::java_lang_Math_max_L:
case TR::java_lang_Math_min_L:
case TR::java_lang_Math_abs_I:
case TR::java_lang_Math_abs_L:
case TR::java_lang_Math_abs_F:
case TR::java_lang_Math_abs_D:
case TR::java_lang_Math_pow:
case TR::java_lang_StrictMath_pow:
case TR::java_lang_Math_exp:
case TR::java_lang_StrictMath_exp:
case TR::java_lang_Math_log:
case TR::java_lang_StrictMath_log:
case TR::java_lang_Math_floor:
case TR::java_lang_Math_ceil:
case TR::java_lang_Math_copySign_F:
case TR::java_lang_Math_copySign_D:
case TR::java_lang_StrictMath_floor:
case TR::java_lang_StrictMath_ceil:
case TR::java_lang_StrictMath_copySign_F:
case TR::java_lang_StrictMath_copySign_D:
case TR::com_ibm_Compiler_Internal__TR_Prefetch:
case TR::java_nio_Bits_keepAlive:
if ((comp->generateArraylets() || comp->isDLT()) && includeGCSafePoint)
return &symRefTab->aliasBuilder.gcSafePointSymRefNumbers();
else
return 0;
default:
break;
}
}
#endif //J9_PROJECT_SPECIFIC
#ifdef J9_PROJECT_SPECIFIC
TR_ResolvedMethod * method = resolvedMethodSymbol->getResolvedMethod();
TR_PersistentMethodInfo * methodInfo = comp->getRecompilationInfo() ? TR_PersistentMethodInfo::get(method) : NULL;
if (methodInfo && (methodInfo->hasRefinedAliasSets() ||
comp->getMethodHotness() >= veryHot ||
resolvedMethodSymbol->hasVeryRefinedAliasSets()) &&
(method->isStatic() || method->isFinal() || isDirectCall))
{
TR_BitVector * aliases = new (aliasRegion) TR_BitVector(bvInitialSize, aliasRegion, growability);
if ((comp->generateArraylets() || comp->isDLT()) && includeGCSafePoint)
*aliases |= symRefTab->aliasBuilder.gcSafePointSymRefNumbers();
if (methodInfo->doesntKillAnything() && !comp->getOption(TR_DisableRefinedAliases))
return aliases;
if ((resolvedMethodSymbol->hasVeryRefinedAliasSets() || comp->getMethodHotness() >= hot) &&
!debug("disableVeryRefinedCallAliasSets"))
{
TR_BitVector * exactAliases = 0;
if (resolvedMethodSymbol->hasVeryRefinedAliasSets())
exactAliases = symRefTab->aliasBuilder.getVeryRefinedCallAliasSets(resolvedMethodSymbol);
else
{
resolvedMethodSymbol->setHasVeryRefinedAliasSets(true);
List<void> methodsPeeked(comp->trMemory());
exactAliases = addVeryRefinedCallAliasSets(resolvedMethodSymbol, aliases, &methodsPeeked);
symRefTab->aliasBuilder.setVeryRefinedCallAliasSets(resolvedMethodSymbol, exactAliases);
}
if (exactAliases)
{
return exactAliases;
}
}
// From here on, we're just checking refined alias info.
// If refined aliases are disabled, return the conservative answer
// we would have returned had we never attempted to use refined
// aliases at all.
//
if (comp->getOption(TR_DisableRefinedAliases))
return symRefTab->aliasBuilder.methodAliases(self());
if (!methodInfo->doesntKillAddressArrayShadows())
{
symRefTab->aliasBuilder.addAddressArrayShadows(aliases);
if (comp->generateArraylets())
aliases->set(symRefTab->getArrayletShadowIndex(TR::Address));
}
if (!methodInfo->doesntKillIntArrayShadows())
{
symRefTab->aliasBuilder.addIntArrayShadows(aliases);
if (comp->generateArraylets())
{
aliases->set(symRefTab->getArrayletShadowIndex(TR::Int32));
}
}
if (!methodInfo->doesntKillNonIntPrimitiveArrayShadows())
{
symRefTab->aliasBuilder.addNonIntPrimitiveArrayShadows(aliases);
if (comp->generateArraylets())
{
aliases->set(symRefTab->getArrayletShadowIndex(TR::Int8));
aliases->set(symRefTab->getArrayletShadowIndex(TR::Int16));
aliases->set(symRefTab->getArrayletShadowIndex(TR::Int32));
aliases->set(symRefTab->getArrayletShadowIndex(TR::Int64));
aliases->set(symRefTab->getArrayletShadowIndex(TR::Float));
aliases->set(symRefTab->getArrayletShadowIndex(TR::Double));
}
}
if (!methodInfo->doesntKillAddressFields())
*aliases |= symRefTab->aliasBuilder.addressShadowSymRefs();
if (!methodInfo->doesntKillIntFields())
*aliases |= symRefTab->aliasBuilder.intShadowSymRefs();
if (!methodInfo->doesntKillNonIntPrimitiveFields())
*aliases |= symRefTab->aliasBuilder.nonIntPrimitiveShadowSymRefs();
if (!methodInfo->doesntKillAddressStatics())
*aliases |= symRefTab->aliasBuilder.addressStaticSymRefs();
if (!methodInfo->doesntKillIntStatics())
*aliases |= symRefTab->aliasBuilder.intStaticSymRefs();
if (!methodInfo->doesntKillNonIntPrimitiveStatics())
*aliases |= symRefTab->aliasBuilder.nonIntPrimitiveStaticSymRefs();
TR_BitVector *methodAliases = symRefTab->aliasBuilder.methodAliases(self());
*aliases &= *methodAliases;
return aliases;
}
#endif
return symRefTab->aliasBuilder.methodAliases(self());
}
case TR::Symbol::IsShadow:
{
if ((self()->isUnresolved() && !_symbol->isConstObjectRef()) || _symbol->isVolatile() || self()->isLiteralPoolAddress() || self()->isFromLiteralPool() ||
(_symbol->isUnsafeShadowSymbol() && !self()->reallySharesSymbol()))
{
if (symRefTab->aliasBuilder.unsafeArrayElementSymRefs().get(self()->getReferenceNumber()))
{
TR_BitVector *aliases = new (aliasRegion) TR_BitVector(bvInitialSize, aliasRegion, growability);
*aliases |= comp->getSymRefTab()->aliasBuilder.defaultMethodDefAliasesWithoutImmutable();
*aliases -= symRefTab->aliasBuilder.cpSymRefs();
return aliases;
}
else
return &comp->getSymRefTab()->aliasBuilder.defaultMethodDefAliasesWithoutImmutable();
}
TR_BitVector *aliases = NULL;
if (_symbol == symRefTab->findGenericIntShadowSymbol())
{
aliases = new (aliasRegion) TR_BitVector(bvInitialSize, aliasRegion, growability);
*aliases |= symRefTab->aliasBuilder.arrayElementSymRefs();
if (comp->generateArraylets())
*aliases |= symRefTab->aliasBuilder.arrayletElementSymRefs();
*aliases |= symRefTab->aliasBuilder.genericIntShadowSymRefs();
*aliases |= symRefTab->aliasBuilder.genericIntArrayShadowSymRefs();
*aliases |= symRefTab->aliasBuilder.genericIntNonArrayShadowSymRefs();
*aliases |= symRefTab->aliasBuilder.unsafeSymRefNumbers();
#ifdef J9_PROJECT_SPECIFIC
*aliases |= symRefTab->aliasBuilder.unresolvedShadowSymRefs();
#endif
if (symRefTab->aliasBuilder.conservativeGenericIntShadowAliasing())
{
*aliases |= symRefTab->aliasBuilder.addressShadowSymRefs();
*aliases |= symRefTab->aliasBuilder.intShadowSymRefs();
*aliases |= symRefTab->aliasBuilder.nonIntPrimitiveShadowSymRefs();
}
aliases->set(self()->getReferenceNumber());
return aliases;
}
if (self()->reallySharesSymbol(comp))
{
aliases = new (aliasRegion) TR_BitVector(bvInitialSize, aliasRegion, growability);
self()->setSharedShadowAliases(aliases, symRefTab);
}
if (symRefTab->findGenericIntShadowSymbol())
{
if (!aliases)
aliases = new (aliasRegion) TR_BitVector(bvInitialSize, aliasRegion, growability);
self()->setLiteralPoolAliases(aliases, symRefTab);
if (symRefTab->aliasBuilder.conservativeGenericIntShadowAliasing() || self()->isUnresolved())
{
*aliases |= symRefTab->aliasBuilder.genericIntShadowSymRefs();
*aliases |= symRefTab->aliasBuilder.genericIntArrayShadowSymRefs();
*aliases |= symRefTab->aliasBuilder.genericIntNonArrayShadowSymRefs();
}
}
if (_symbol->isArrayShadowSymbol() &&
symRefTab->findGenericIntShadowSymbol())
{
if (!aliases)
aliases = new (aliasRegion) TR_BitVector(bvInitialSize, aliasRegion, growability);
*aliases |= symRefTab->aliasBuilder.genericIntShadowSymRefs();
*aliases |= symRefTab->aliasBuilder.genericIntArrayShadowSymRefs();
if (supportArrayRefinement && self()->getIndependentSymRefs())
*aliases -= *self()->getIndependentSymRefs();
}
#ifdef J9_PROJECT_SPECIFIC
// make TR::PackedDecimal aliased with TR::Int8(byte)
if (_symbol->isArrayShadowSymbol() && _symbol->getDataType() == TR::PackedDecimal)
{
if (!aliases)
aliases = new (aliasRegion) TR_BitVector(bvInitialSize, aliasRegion, growability);
aliases->set(symRefTab->getArrayShadowIndex(TR::Int8));
}
//the other way around.
if (_symbol->isArrayShadowSymbol() && _symbol->getDataType() == TR::Int8)
{
if (!aliases)
aliases = new (aliasRegion) TR_BitVector(bvInitialSize, aliasRegion, growability);
aliases->set(symRefTab->getArrayShadowIndex(TR::PackedDecimal));
}
#endif
// alias vector arrays shadows with corresponding scalar array shadows
if (_symbol->isArrayShadowSymbol() && _symbol->getDataType().isVector())
{
if (!aliases)
aliases = new (aliasRegion) TR_BitVector(bvInitialSize, aliasRegion, growability);
aliases->set(symRefTab->getArrayShadowIndex(_symbol->getDataType().vectorToScalar()));
}
// the other way around
if (_symbol->isArrayShadowSymbol() && !_symbol->getDataType().isVector())
{
if (!aliases)
aliases = new (aliasRegion) TR_BitVector(bvInitialSize, aliasRegion, growability);
aliases->set(symRefTab->getArrayShadowIndex(_symbol->getDataType().scalarToVector()));
}
if (_symbol->isArrayShadowSymbol() &&
!symRefTab->aliasBuilder.immutableArrayElementSymRefs().isEmpty())
{
if (!aliases)
aliases = new (aliasRegion) TR_BitVector(bvInitialSize, aliasRegion, growability);
TR::DataType type = _symbol->getDataType();
TR_BitVectorIterator bvi(symRefTab->aliasBuilder.arrayElementSymRefs());
int32_t symRefNum;
while (bvi.hasMoreElements())
{
symRefNum = bvi.getNextElement();
if (symRefTab->getSymRef(symRefNum)->getSymbol()->getDataType() == type)
aliases->set(symRefNum);
}
}
if (_symbol->isArrayShadowSymbol() &&
supportArrayRefinement &&
comp->getMethodSymbol()->hasVeryRefinedAliasSets())
{
if (!aliases)
aliases = new (aliasRegion) TR_BitVector(bvInitialSize, aliasRegion, growability);
TR::DataType type = _symbol->getDataType();
TR_BitVectorIterator bvi(symRefTab->aliasBuilder.arrayElementSymRefs());
int32_t symRefNum;
while (bvi.hasMoreElements())
{
symRefNum = bvi.getNextElement();
if (symRefTab->getSymRef(symRefNum)->getSymbol()->getDataType() == type)
aliases->set(symRefNum);
}
if (self()->getIndependentSymRefs())
*aliases -= *self()->getIndependentSymRefs();
return aliases;
}
if (aliases)
aliases->set(self()->getReferenceNumber());
if (symRefTab->aliasBuilder.unsafeArrayElementSymRefs().get(self()->getReferenceNumber()))
*aliases -= symRefTab->aliasBuilder.cpSymRefs();
else if (symRefTab->aliasBuilder.cpSymRefs().get(self()->getReferenceNumber()))
*aliases -= symRefTab->aliasBuilder.unsafeArrayElementSymRefs();
return aliases;
}
case TR::Symbol::IsStatic:
{
// For unresolved constant dynamic, we need to invoke a Java bootstrap method,
// which can have arbitrary side effects, so the aliasing should be conservative here.
// isConstObjectRef now returns true for condy, so we add an explicit condition,
// more like a short-circuit, to say if we are unresolved and not isConstObjectRef
// (this is the same as before), or if we are unresolved and condy
// (this is the extra condition added), we would return conservative aliases.
if ((self()->isUnresolved() && (_symbol->isConstantDynamic() || !_symbol->isConstObjectRef())) ||
self()->isLiteralPoolAddress() || self()->isFromLiteralPool() || _symbol->isVolatile())
{
return &comp->getSymRefTab()->aliasBuilder.defaultMethodDefAliases();
}
TR_BitVector *aliases = NULL;
if (self()->reallySharesSymbol(comp))
{
aliases = new (aliasRegion) TR_BitVector(bvInitialSize, aliasRegion, growability);
self()->setSharedStaticAliases(aliases, symRefTab);
}
if (symRefTab->findGenericIntShadowSymbol())
{
if (!aliases)
aliases = new (aliasRegion) TR_BitVector(bvInitialSize, aliasRegion, growability);
self()->setLiteralPoolAliases(aliases, symRefTab);
}
if (aliases)
aliases->set(self()->getReferenceNumber());
return aliases;
}
case TR::Symbol::IsMethodMetaData:
{
TR_BitVector *aliases = NULL;
return aliases;
}
default:
//TR_ASSERT(0, "getUseDefAliasing called for non method");
if (comp->generateArraylets() && comp->getSymRefTab()->aliasBuilder.gcSafePointSymRefNumbers().get(self()->getReferenceNumber()) && includeGCSafePoint)
return &comp->getSymRefTab()->aliasBuilder.gcSafePointSymRefNumbers();
else
return 0;
}
}
bool
OMR::SymbolReference::sharesSymbol(bool includingGCSafePoint)
{
TR::Compilation * c = TR::comp();
if (self()->reallySharesSymbol(c))
return true;
// At this point, we'd like to call getUseDefAliases(c, false) and return
// true iff that is non-NULL. However, doing so caused floatSanity
// (specifically CompactNullChecks) to consume immense amounts (1GB+) of
// memory and run for a long, long time (half an hour or more in some
// cases), so we need to copy some of that logic in here as a short-circuit.
//
// !!! NOTE !!!
// THERE IS A COPY OF THIS LOGIC IN getUseDefAliases
//
int32_t kind = _symbol->getKind();
TR::SymbolReferenceTable * symRefTab = c->getSymRefTab();
switch (kind)
{
case TR::Symbol::IsShadow:
case TR::Symbol::IsStatic:
{
// For unresolved constant dynamic, we need to invoke a Java bootstrap method,
// which can have arbitrary side effects, so the aliasing should be conservative here.
// isConstObjectRef now returns true for condy, so we add an explicit condition,
// more like a short-circuit, to say if we are unresolved and not isConstObjectRef
// (this is the same as before), or if we are unresolved and condy
// (this is the extra condition added), we would return conservative aliases.
if ((self()->isUnresolved() && (_symbol->isConstantDynamic() || !_symbol->isConstObjectRef())) ||
_symbol->isVolatile() || self()->isLiteralPoolAddress() ||
self()->isFromLiteralPool() || _symbol->isUnsafeShadowSymbol() ||
(_symbol->isArrayShadowSymbol() && c->getMethodSymbol()->hasVeryRefinedAliasSets()))
{
// getUseDefAliases might not return NULL
}
else if (!symRefTab->aliasBuilder.mutableGenericIntShadowHasBeenCreated())
{
// getUseDefAliases must return NULL
return false;
}
else if (kind == TR::Symbol::IsStatic && !symRefTab->aliasBuilder.litPoolGenericIntShadowHasBeenCreated())
{
// getUseDefAliases must return NULL
return false;
}
break;
}
}
return !self()->getUseDefAliases(false, includingGCSafePoint).isZero(c);
}
void
OMR::SymbolReference::setLiteralPoolAliases(TR_BitVector * aliases, TR::SymbolReferenceTable * symRefTab)
{
if (!symRefTab->findGenericIntShadowSymbol())
return;
TR_SymRefIterator i(symRefTab->aliasBuilder.genericIntShadowSymRefs(), symRefTab);
TR::SymbolReference * symRef;
while ((symRef = i.getNext()))
if (symRef->isLiteralPoolAddress() || symRef->isFromLiteralPool())
aliases->set(symRef->getReferenceNumber());
aliases->set(self()->getReferenceNumber());
*aliases |= symRefTab->aliasBuilder.unsafeSymRefNumbers();
}
void
OMR::SymbolReference::setSharedShadowAliases(TR_BitVector * aliases, TR::SymbolReferenceTable * symRefTab)
{
if (self()->reallySharesSymbol() && !_symbol->isUnsafeShadowSymbol())
{
TR::DataType type = self()->getSymbol()->getType();
TR_SymRefIterator i(type.isAddress() ? symRefTab->aliasBuilder.addressShadowSymRefs()
: (type.isInt32() ? symRefTab->aliasBuilder.intShadowSymRefs()
: symRefTab->aliasBuilder.nonIntPrimitiveShadowSymRefs()), symRefTab);
TR::SymbolReference * symRef;
while ((symRef = i.getNext()))
if (symRef->getSymbol() == self()->getSymbol())
aliases->set(symRef->getReferenceNumber());
// include symbol reference's own shared alias bitvector
if (symRefTab->getSharedAliases(self()) != NULL)
*aliases |= *(symRefTab->getSharedAliases(self()));
}
else
aliases->set(self()->getReferenceNumber());
*aliases |= symRefTab->aliasBuilder.unsafeSymRefNumbers();
}
void
OMR::SymbolReference::setSharedStaticAliases(TR_BitVector * aliases, TR::SymbolReferenceTable * symRefTab)
{
if (self()->reallySharesSymbol())
{
TR::DataType type = self()->getSymbol()->getType();
TR_SymRefIterator i(type.isAddress() ? symRefTab->aliasBuilder.addressStaticSymRefs()
: (type.isInt32() ? symRefTab->aliasBuilder.intStaticSymRefs()
: symRefTab->aliasBuilder.nonIntPrimitiveStaticSymRefs()), symRefTab);
TR::SymbolReference * symRef;
while ((symRef = i.getNext()))
if (symRef->getSymbol() == self()->getSymbol())
aliases->set(symRef->getReferenceNumber());
}
else
aliases->set(self()->getReferenceNumber());
*aliases |= symRefTab->aliasBuilder.unsafeSymRefNumbers();
}
#ifdef J9_PROJECT_SPECIFIC
TR_BitVector *
addVeryRefinedCallAliasSets(TR::ResolvedMethodSymbol * methodSymbol, TR_BitVector * aliases, List<void> * methodsPeeked)
{
TR::Compilation *comp = TR::comp();
void * methodId = methodSymbol->getResolvedMethod()->getPersistentIdentifier();
if (methodsPeeked->find(methodId))
{
// This can't be allocated into the alias region as it must be accessed across optimizations
TR_BitVector *heapAliases = new (comp->trHeapMemory()) TR_BitVector(comp->getSymRefCount(), comp->trMemory(), heapAlloc, growable);
*heapAliases |= *aliases;
return heapAliases;
}
// stop if the peek is getting very deep
//
if (methodsPeeked->getSize() >= PEEK_THRESHOLD)
return 0;
methodsPeeked->add(methodId);
dumpOptDetails(comp, "O^O REFINING ALIASES: Peeking into the IL to refine aliases \n");
if (!methodSymbol->getResolvedMethod()->genMethodILForPeeking(methodSymbol, comp, true))
return 0;
TR::SymbolReferenceTable * symRefTab = comp->getSymRefTab();
for (TR::TreeTop * tt = methodSymbol->getFirstTreeTop(); tt; tt = tt->getNextTreeTop())
{
TR::Node *node = tt->getNode();
if (node->getOpCode().isResolveCheck())
return 0;
if ((node->getOpCodeValue() == TR::treetop) ||
(node->getOpCodeValue() == TR::compressedRefs) ||
node->getOpCode().isCheck())
node = node->getFirstChild();
if (node->getOpCode().isStore())
{
TR::SymbolReference * symRefInCallee = node->getSymbolReference(), * symRefInCaller;
TR::Symbol * symInCallee = symRefInCallee->getSymbol();
TR::DataType type = symInCallee->getDataType();
if (symInCallee->isShadow())
{
if (symInCallee->isArrayShadowSymbol())
symRefInCaller = symRefTab->getSymRef(symRefTab->getArrayShadowIndex(type));
else if (symInCallee->isArrayletShadowSymbol())
symRefInCaller = symRefTab->getSymRef(symRefTab->getArrayletShadowIndex(type));
else
symRefInCaller = symRefTab->findShadowSymbol(symRefInCallee->getOwningMethod(comp), symRefInCallee->getCPIndex(), type);
if (symRefInCaller)
{
if (symRefInCaller->reallySharesSymbol(comp))
symRefInCaller->setSharedShadowAliases(aliases, symRefTab);
aliases->set(symRefInCaller->getReferenceNumber());
}
}
else if (symInCallee->isStatic())
{
symRefInCaller = symRefTab->findStaticSymbol(symRefInCallee->getOwningMethod(comp), symRefInCallee->getCPIndex(), type);
if (symRefInCaller)
{
if (symRefInCaller->reallySharesSymbol(comp))
symRefInCaller->setSharedStaticAliases(aliases, symRefTab);
else
aliases->set(symRefInCaller->getReferenceNumber());
}
}
}
else if (node->getOpCode().isCall())
{
if (node->getOpCode().isCallIndirect())
return 0;
TR::ResolvedMethodSymbol * calleeSymbol = node->getSymbol()->getResolvedMethodSymbol();
if (!calleeSymbol)
return 0;
TR_ResolvedMethod * calleeMethod = calleeSymbol->getResolvedMethod();
if (!calleeMethod->isCompilable(comp->trMemory()) || calleeMethod->isJNINative())
return 0;
if (!addVeryRefinedCallAliasSets(calleeSymbol, aliases, methodsPeeked))
return 0;
}
else if (node->getOpCodeValue() == TR::monent)