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VPConstraint.cpp
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VPConstraint.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 "optimizer/VPConstraint.hpp"
#include <ctype.h>
#include <stddef.h>
#include "env/FrontEnd.hpp"
#include "compile/Compilation.hpp"
#include "compile/ResolvedMethod.hpp"
#include "control/Options.hpp"
#include "control/Options_inlines.hpp"
#include "env/CompilerEnv.hpp"
#include "env/IO.hpp"
#include "env/KnownObjectTable.hpp"
#include "env/ObjectModel.hpp"
#include "env/PersistentInfo.hpp"
#include "env/jittypes.h"
#ifdef J9_PROJECT_SPECIFIC
#include "env/VMAccessCriticalSection.hpp"
#endif
#include "il/DataTypes.hpp"
#include "il/ILOps.hpp"
#include "il/Node.hpp"
#include "il/StaticSymbol.hpp"
#include "il/Symbol.hpp"
#include "il/SymbolReference.hpp"
#include "ilgen/IlGenRequest.hpp"
#include "ilgen/IlGeneratorMethodDetails.hpp"
#include "optimizer/Optimization_inlines.hpp"
#include "optimizer/ValuePropagation.hpp"
#ifdef J9_PROJECT_SPECIFIC
#include "env/PersistentCHTable.hpp"
#include "runtime/RuntimeAssumptions.hpp"
#include "env/VMJ9.h"
#endif
// ***************************************************************************
//
// Methods of Value Propagation Constraints
//
// ***************************************************************************
TR::VPShortConstraint *TR::VPConstraint::asShortConstraint() { return NULL; }
TR::VPShortConst *TR::VPConstraint::asShortConst() { return NULL; }
TR::VPShortRange *TR::VPConstraint::asShortRange() { return NULL; }
TR::VPIntConstraint *TR::VPConstraint::asIntConstraint() { return NULL; }
TR::VPIntConst *TR::VPConstraint::asIntConst() { return NULL; }
TR::VPIntRange *TR::VPConstraint::asIntRange() { return NULL; }
TR::VPLongConstraint *TR::VPConstraint::asLongConstraint() { return NULL; }
TR::VPLongConst *TR::VPConstraint::asLongConst() { return NULL; }
TR::VPLongRange *TR::VPConstraint::asLongRange() { return NULL; }
TR::VP_BCDValue *TR::VPConstraint::asBCDValue() { return NULL; }
TR::VP_BCDSign *TR::VPConstraint::asBCDSign() { return NULL; }
TR::VPClass *TR::VPConstraint::asClass() { return NULL; }
TR::VPClassType *TR::VPConstraint::asClassType() { return NULL; }
TR::VPResolvedClass *TR::VPConstraint::asResolvedClass() { return NULL; }
TR::VPFixedClass *TR::VPConstraint::asFixedClass() { return NULL; }
TR::VPConstString *TR::VPConstraint::asConstString() { return NULL; }
TR::VPKnownObject *TR::VPConstraint::asKnownObject() { return NULL; }
TR::VPUnresolvedClass *TR::VPConstraint::asUnresolvedClass() { return NULL; }
TR::VPClassPresence *TR::VPConstraint::asClassPresence() { return NULL; }
TR::VPNullObject *TR::VPConstraint::asNullObject() { return NULL; }
TR::VPNonNullObject *TR::VPConstraint::asNonNullObject() { return NULL; }
TR::VPPreexistentObject *TR::VPConstraint::asPreexistentObject() { return NULL; }
TR::VPArrayInfo *TR::VPConstraint::asArrayInfo() { return NULL; }
TR::VPObjectLocation *TR::VPConstraint::asObjectLocation() { return NULL; }
TR::VPMergedConstraints *TR::VPConstraint::asMergedConstraints() { return NULL; }
TR::VPMergedConstraints *TR::VPConstraint::asMergedShortConstraints() {return NULL;}
TR::VPMergedConstraints *TR::VPConstraint::asMergedIntConstraints() { return NULL; }
TR::VPMergedConstraints *TR::VPConstraint::asMergedLongConstraints(){ return NULL; }
TR::VPUnreachablePath *TR::VPConstraint::asUnreachablePath() { return NULL; }
TR::VPSync *TR::VPConstraint::asVPSync() { return NULL; }
TR::VPRelation *TR::VPConstraint::asRelation() { return NULL; }
TR::VPLessThanOrEqual *TR::VPConstraint::asLessThanOrEqual() { return NULL; }
TR::VPGreaterThanOrEqual*TR::VPConstraint::asGreaterThanOrEqual(){ return NULL; }
TR::VPEqual *TR::VPConstraint::asEqual() { return NULL; }
TR::VPNotEqual *TR::VPConstraint::asNotEqual() { return NULL; }
TR::VPShortConstraint *TR::VPShortConstraint::asShortConstraint() { return this;}
TR::VPShortConst *TR::VPShortConst::asShortConst() { return this;}
TR::VPShortRange *TR::VPShortRange::asShortRange() { return this;}
TR::VPIntConstraint *TR::VPIntConstraint::asIntConstraint() { return this; }
TR::VPIntConst *TR::VPIntConst::asIntConst() { return this; }
TR::VPIntRange *TR::VPIntRange::asIntRange() { return this; }
TR::VPLongConstraint *TR::VPLongConstraint::asLongConstraint() { return this; }
TR::VPLongConst *TR::VPLongConst::asLongConst() { return this; }
TR::VPLongRange *TR::VPLongRange::asLongRange() { return this; }
TR::VPClass *TR::VPClass::asClass() { return this; }
TR::VPClassType *TR::VPClassType::asClassType() { return this; }
TR::VPResolvedClass *TR::VPResolvedClass::asResolvedClass() { return this; }
TR::VPFixedClass *TR::VPFixedClass::asFixedClass() { return this; }
TR::VPConstString *TR::VPConstString::asConstString() { return this; }
TR::VPKnownObject *TR::VPKnownObject::asKnownObject() { return this; }
TR::VPUnresolvedClass *TR::VPUnresolvedClass::asUnresolvedClass() { return this; }
TR::VPClassPresence *TR::VPClassPresence::asClassPresence() { return this; }
TR::VPNullObject *TR::VPNullObject::asNullObject() { return this; }
TR::VPNonNullObject *TR::VPNonNullObject::asNonNullObject() { return this; }
TR::VPPreexistentObject *TR::VPPreexistentObject::asPreexistentObject() { return this; }
TR::VPArrayInfo *TR::VPArrayInfo::asArrayInfo() { return this; }
TR::VPObjectLocation *TR::VPObjectLocation::asObjectLocation() { return this; }
TR::VPMergedConstraints *TR::VPMergedConstraints::asMergedConstraints() { return this; }
TR::VPMergedConstraints *TR::VPMergedConstraints::asMergedShortConstraints() { return (_type.isInt16()) ? this : NULL; }
TR::VPMergedConstraints *TR::VPMergedConstraints::asMergedIntConstraints() { return (_type.isInt32()) ? this : NULL; }
TR::VPMergedConstraints *TR::VPMergedConstraints::asMergedLongConstraints() { return (_type.isInt64()) ? this : NULL; }
TR::VPUnreachablePath *TR::VPUnreachablePath::asUnreachablePath() { return this; }
TR::VPSync *TR::VPSync::asVPSync() { return this; }
TR::VPRelation *TR::VPRelation::asRelation() { return this; }
TR::VPLessThanOrEqual *TR::VPLessThanOrEqual::asLessThanOrEqual() { return this; }
TR::VPGreaterThanOrEqual*TR::VPGreaterThanOrEqual::asGreaterThanOrEqual(){ return this; }
TR::VPEqual *TR::VPEqual::asEqual() { return this; }
TR::VPNotEqual *TR::VPNotEqual::asNotEqual() { return this; }
int16_t TR::VPConstraint::getLowShort()
{
if (isUnsigned())
return static_cast<int16_t>(TR::getMinUnsigned<TR::Int16>());
return static_cast<int16_t>(TR::getMinSigned<TR::Int16>());
}
int16_t TR::VPConstraint::getHighShort()
{
if (isUnsigned())
return static_cast<int16_t>(TR::getMaxUnsigned<TR::Int16>());
return static_cast<int16_t>(TR::getMaxSigned<TR::Int16>());
}
int32_t TR::VPConstraint::getLowInt()
{
if (isUnsigned())
return static_cast<int32_t>(TR::getMinUnsigned<TR::Int32>());
return static_cast<int32_t>(TR::getMinSigned<TR::Int32>());
}
int32_t TR::VPConstraint::getHighInt()
{
if (isUnsigned())
return static_cast<int32_t>(TR::getMaxUnsigned<TR::Int32>());
return static_cast<int32_t>(TR::getMaxSigned<TR::Int32>());
}
int64_t TR::VPConstraint::getLowLong()
{
return TR::getMinSigned<TR::Int64>();
}
int64_t TR::VPConstraint::getHighLong()
{
return TR::getMaxSigned<TR::Int64>();
}
uint16_t TR::VPConstraint::getUnsignedLowShort()
{
if ( (getLowShort() ^ getHighShort()) >= 0) // if both numbers are the same sign, return the small value
return static_cast<uint16_t>(getLowShort());
return static_cast<uint16_t>(TR::getMinUnsigned<TR::Int16>());
}
uint16_t TR::VPConstraint::getUnsignedHighShort()
{
if ( (getLowShort() ^ getHighShort()) >= 0) // if both numbers have the same sign, getHigh is the high value
return static_cast<uint16_t>(getHighShort());
return static_cast<uint16_t>(TR::getMaxUnsigned<TR::Int16>());
}
uint32_t TR::VPConstraint::getUnsignedLowInt()
{
if ( (getLowInt() ^ getHighInt()) >= 0) // if both numbers are the same sign, return the small value
return static_cast<uint32_t>(getLowInt());
return static_cast<uint32_t>(TR::getMinUnsigned<TR::Int32>());
}
uint32_t TR::VPConstraint::getUnsignedHighInt()
{
if ( (getLowInt() ^ getHighInt()) >= 0) // if both numbers have the same sign, getHigh is the high value
return static_cast<uint32_t>(getHighInt());
return static_cast<uint32_t>(TR::getMaxUnsigned<TR::Int32>());
}
uint64_t TR::VPConstraint::getUnsignedLowLong()
{
if ( (getLowLong() ^ getHighLong()) >= 0) // if both numbers are the same sign, return the small value
return (uint64_t)getLowLong();
return TR::getMinUnsigned<TR::Int64>();
}
uint64_t TR::VPConstraint::getUnsignedHighLong()
{
if ( (getLowLong() ^ getHighLong()) >= 0) // if both numbers have the same sign, getHigh is the high value
return (uint64_t)getHighLong();
return TR::getMaxUnsigned<TR::Int64>(); // consumer beware! You don't want to assign this to a int64_t
}
bool TR::VPConstraint::isNullObject()
{
return false;
}
bool TR::VPConstraint::isNonNullObject()
{
return false;
}
bool TR::VPConstraint::isPreexistentObject()
{
return false;
}
TR_OpaqueClassBlock *TR::VPConstraint::getClass()
{
return NULL;
}
bool TR::VPConstraint::isFixedClass()
{
return false;
}
bool TR::VPConstraint::isConstString()
{
return false;
}
// VP_SPECIALKLASS is created so that any type that
// intersects with it results in a null type. It is
// not meant to be propagated during the analysis
//
bool TR::VPConstraint::isSpecialClass(uintptr_t klass)
{
if (klass == VP_SPECIALKLASS)
return true;
return false;
}
TR_YesNoMaybe TR::VPConstraint::canOverflow()
{
return TR_maybe;
}
TR::VPClassType *TR::VPConstraint::getClassType()
{
return NULL;
}
TR::VPClassPresence *TR::VPConstraint::getClassPresence()
{
return NULL;
}
TR::VPArrayInfo *TR::VPConstraint::getArrayInfo()
{
return NULL;
}
TR::VPPreexistentObject *TR::VPConstraint::getPreexistence()
{
return NULL;
}
TR::VPObjectLocation *TR::VPConstraint::getObjectLocation()
{
return NULL;
}
TR::VPKnownObject *TR::VPConstraint::getKnownObject()
{
return NULL;
}
TR::VPConstString *TR::VPConstraint::getConstString()
{
return NULL;
}
const char *TR::VPConstraint::getClassSignature(int32_t &len)
{
return NULL;
}
TR_YesNoMaybe TR::VPConstraint::isStackObject()
{
return TR_maybe;
}
TR_YesNoMaybe TR::VPConstraint::isHeapObject()
{
return TR_maybe;
}
TR_YesNoMaybe TR::VPConstraint::isClassObject()
{
return TR_maybe;
}
TR_YesNoMaybe TR::VPConstraint::isJavaLangClassObject()
{
return TR_maybe;
}
TR_YesNoMaybe TR::VPConstraint::isJ9ClassObject()
{
return TR_maybe;
}
int16_t TR::VPShortConstraint::getLowShort()
{
return getLow();
}
int16_t TR::VPShortConstraint::getHighShort()
{
return getHigh();
}
int32_t TR::VPIntConstraint::getLowInt()
{
return getLow();
}
int32_t TR::VPIntConstraint::getHighInt()
{
return getHigh();
}
int64_t TR::VPLongConstraint::getLowLong()
{
return getLow();
}
int64_t TR::VPLongConstraint::getHighLong()
{
return getHigh();
}
int16_t TR::VPMergedConstraints::getLowShort()
{
return _constraints.getListHead()->getData()->getLowShort();
}
int16_t TR::VPMergedConstraints::getHighShort()
{
return _constraints.getListHead()->getData()->getHighShort();
}
int32_t TR::VPMergedConstraints::getLowInt()
{
return _constraints.getListHead()->getData()->getLowInt();
}
int32_t TR::VPMergedConstraints::getHighInt()
{
return _constraints.getLastElement()->getData()->getHighInt();
}
int64_t TR::VPMergedConstraints::getLowLong()
{
return _constraints.getListHead()->getData()->getLowLong();
}
int64_t TR::VPMergedConstraints::getHighLong()
{
return _constraints.getLastElement()->getData()->getHighLong();
}
uint16_t TR::VPMergedConstraints::getUnsignedLowShort()
{
return _constraints.getListHead()->getData()->getUnsignedLowShort();
}
uint16_t TR::VPMergedConstraints::getUnsignedHighShort()
{
return _constraints.getListHead()->getData()->getUnsignedHighShort();
}
uint32_t TR::VPMergedConstraints::getUnsignedLowInt()
{
return _constraints.getListHead()->getData()->getUnsignedLowInt();
}
uint32_t TR::VPMergedConstraints::getUnsignedHighInt()
{
return _constraints.getLastElement()->getData()->getHighInt();
}
uint64_t TR::VPMergedConstraints::getUnsignedLowLong()
{
return _constraints.getListHead()->getData()->getUnsignedLowLong();
}
uint64_t TR::VPMergedConstraints::getUnsignedHighLong()
{
return _constraints.getLastElement()->getData()->getUnsignedHighLong();
}
const char *TR::VPClass::getClassSignature(int32_t &len)
{
if (_type)
return _type->getClassSignature(len);
return NULL;
}
bool TR::VPClass::isNullObject()
{
if (_presence)
return _presence->isNullObject();
return false;
}
bool TR::VPClass::isNonNullObject()
{
if (_presence)
return _presence->isNonNullObject();
return false;
}
bool TR::VPClass::isPreexistentObject()
{
if (_preexistence)
return _preexistence->isPreexistentObject();
return false;
}
TR_OpaqueClassBlock *TR::VPClass::getClass()
{
if (_type)
return _type->getClass();
return NULL;
}
bool TR::VPClass::isFixedClass()
{
if (_type)
return _type->isFixedClass();
return false;
}
bool TR::VPClass::isConstString()
{
if (_type)
return _type->isConstString();
return false;
}
TR_YesNoMaybe TR::VPClass::isStackObject()
{
if (_location)
return _location->isStackObject();
return TR_maybe;
}
TR_YesNoMaybe TR::VPClass::isHeapObject()
{
if (_location)
return _location->isHeapObject();
return TR_maybe;
}
TR_YesNoMaybe TR::VPClass::isClassObject()
{
if (_location && _location->isClassObject() != TR_maybe)
return _location->isClassObject();
if (_type && _type->isJavaLangClassObject() != TR_maybe)
return _type->isJavaLangClassObject();
return TR_maybe;
}
TR_YesNoMaybe TR::VPClass::isJavaLangClassObject()
{
if (_location && _location->isJavaLangClassObject() != TR_maybe)
return _location->isJavaLangClassObject();
if (_type && _type->isJavaLangClassObject() != TR_maybe)
return _type->isJavaLangClassObject();
return TR_maybe;
}
TR_YesNoMaybe TR::VPClass::isJ9ClassObject()
{
if (_location != NULL)
return _location->isJ9ClassObject();
else if (_type != NULL)
return TR_no; // in absence of _location, _type means an instance
else
return TR_maybe;
}
TR::VPClassType *TR::VPClass::getClassType()
{
return _type;
}
TR::VPArrayInfo *TR::VPClass::getArrayInfo()
{
return _arrayInfo;
}
TR::VPClassPresence *TR::VPClass::getClassPresence()
{
return _presence;
}
TR::VPPreexistentObject *TR::VPClass::getPreexistence()
{
return _preexistence;
}
TR::VPObjectLocation *TR::VPClass::getObjectLocation()
{
return _location;
}
TR::VPKnownObject *TR::VPClass::getKnownObject()
{
return _type? _type->asKnownObject() : NULL;
}
TR::VPConstString *TR::VPClass::getConstString()
{
return _type? _type->asConstString() : NULL;
}
TR::VPClassType *TR::VPClassType::getClassType()
{
return this;
}
TR::VPClassPresence *TR::VPClassPresence::getClassPresence()
{
return this;
}
TR::VPPreexistentObject *TR::VPPreexistentObject::getPreexistence()
{
return this;
}
TR::VPObjectLocation *TR::VPObjectLocation::getObjectLocation()
{
return this;
}
TR::DataType TR::VPClassType::getPrimitiveArrayDataType()
{
if (_sig[0] != '[')
return TR::NoType;
switch (_sig[1])
{
case 'Z':
case 'B': return TR::Int8;
case 'C':
case 'S': return TR::Int16;
case 'I': return TR::Int32;
case 'J': return TR::Int64;
case 'F': return TR::Float;
case 'D': return TR::Double;
}
return TR::NoType;
}
TR_YesNoMaybe TR::VPClassType::isClassObject()
{
return isJavaLangClassObject();
}
TR_YesNoMaybe TR::VPClassType::isJavaLangClassObject()
{
// TR_yes will cause callers to misinterpret
// this->getClassType()==this as the represented class, i.e.
// it would make this look just like Class.class.
if (_len == 17 && strncmp(_sig, "Ljava/lang/Class;", 17) == 0)
return TR_maybe;
if ((_len == 18 && strncmp(_sig, "Ljava/lang/Object;", 18) == 0) ||
(_len == 22 && strncmp(_sig, "Ljava/io/Serializable;", 22) == 0) ||
(_len == 36 && strncmp(_sig, "Ljava/lang/reflect/AnnotatedElement;", 36) == 0) ||
(_len == 38 && strncmp(_sig, "Ljava/lang/reflect/GenericDeclaration;", 38) == 0) ||
(_len == 24 && strncmp(_sig, "Ljava/lang/reflect/Type;", 24) == 0))
return TR_maybe;
return TR_no; // java.lang.Class is final and is the direct subclass of Object.
}
TR_YesNoMaybe TR::VPClassType::isJ9ClassObject()
{
return TR_no;
}
TR_YesNoMaybe TR::VPKnownObject::isJavaLangClassObject()
{
// The class held in the base TR::VPFixedClass is usually the class to which
// the instance belongs, but if that would be java/lang/Class, then it's
// instead the represented class.
return _isJavaLangClass ? TR_yes : TR_no;
}
bool TR::VPKnownObject::isArrayWithConstantElements(TR::Compilation * comp)
{
TR::KnownObjectTable *knot = comp->getKnownObjectTable();
TR_ASSERT(knot, "TR::KnownObjectTable should not be null");
return knot->isArrayWithConstantElements(_index);
}
bool TR::VPKnownObject::isArrayWithStableElements(TR::Compilation * comp)
{
TR::KnownObjectTable *knot = comp->getKnownObjectTable();
TR_ASSERT(knot, "TR::KnownObjectTable should not be null");
return knot->isArrayWithStableElements(_index);
}
TR_YesNoMaybe TR::VPClassType::isArray()
{
if (_sig[0] == '[')
return TR_yes;
if ((strncmp(_sig, "Ljava/lang/Object;", 18) == 0) ||
isCloneableOrSerializable())
return TR_maybe;
return TR_no; // all arrays are direct subclasses of Object or other arrays (both cases covered above)
}
TR::VPResolvedClass::VPResolvedClass(TR_OpaqueClassBlock *klass, TR::Compilation * comp)
: TR::VPClassType(ResolvedClassPriority), _class(klass)
{
if (TR::VPConstraint::isSpecialClass((uintptr_t)klass))
{ _len = 0; _sig = 0; }
else
_sig = TR::Compiler->cls.classSignature_DEPRECATED(comp, klass, _len, comp->trMemory());
}
TR::VPResolvedClass::VPResolvedClass(TR_OpaqueClassBlock *klass, TR::Compilation * comp, int32_t p)
: TR::VPClassType(p), _class(klass)
{
if (TR::VPConstraint::isSpecialClass((uintptr_t)klass))
{ _len = 0; _sig = 0; }
else
_sig = TR::Compiler->cls.classSignature_DEPRECATED(comp, klass, _len, comp->trMemory());
}
TR_OpaqueClassBlock *TR::VPResolvedClass::getClass()
{
return _class;
}
const char *TR::VPResolvedClass::getClassSignature(int32_t &len)
{
len = _len;
return _sig;
}
TR::VPClassType *TR::VPResolvedClass::getArrayClass(OMR::ValuePropagation *vp)
{
TR_OpaqueClassBlock *arrayClass = vp->fe()->getArrayClassFromComponentClass(getClass());
if (arrayClass)
return TR::VPResolvedClass::create(vp, arrayClass);
// TODO - when getArrayClassFromComponentClass is fixed up to always return
// the array class, remove the above "if" and the following code.
//
char *arraySig = (char *)vp->trMemory()->allocateStackMemory(_len+2);
arraySig[0] = '[';
arraySig[_len+1] = 0;
memcpy(arraySig+1, _sig, _len);
return TR::VPUnresolvedClass::create(vp, arraySig, _len+1, vp->comp()->getCurrentMethod());
}
bool TR::VPResolvedClass::isReferenceArray(TR::Compilation *comp)
{
return TR::Compiler->cls.isReferenceArray(comp, _class);
}
bool TR::VPResolvedClass::isPrimitiveArray(TR::Compilation *comp)
{
return TR::Compiler->cls.isPrimitiveArray(comp, _class);
}
bool TR::VPResolvedClass::isJavaLangObject(OMR::ValuePropagation *vp)
{
#ifdef J9_PROJECT_SPECIFIC
void *javaLangObject = vp->comp()->getObjectClassPointer();
if (javaLangObject)
return javaLangObject == _class;
#endif
return (_len == 18 && !strncmp(_sig, "Ljava/lang/Object;", 18));
}
bool TR::VPClassType::isCloneableOrSerializable()
{
if (_len == 21 && !strncmp(_sig, "Ljava/lang/Cloneable;", 21) )
return true;
if (_len == 22 && !strncmp(_sig, "Ljava/io/Serializable;", 22) )
return true;
return false;
}
bool TR::VPFixedClass::isFixedClass()
{
return true;
}
bool TR::VPConstString::isConstString()
{
return true;
}
TR::VPClassType *TR::VPFixedClass::getArrayClass(OMR::ValuePropagation *vp)
{
TR_OpaqueClassBlock *arrayClass = vp->fe()->getArrayClassFromComponentClass(getClass());
if (arrayClass)
return TR::VPFixedClass::create(vp, arrayClass);
// TODO - when getArrayClassFromComponentClass is fixed up to always return
// the array class, remove the above "if" and the following code.
//
char *arraySig = (char *)vp->trMemory()->allocateStackMemory(_len+2);
arraySig[0] = '[';
arraySig[_len+1] = 0;
memcpy(arraySig+1, _sig, _len);
return TR::VPUnresolvedClass::create(vp, arraySig, _len+1, vp->comp()->getCurrentMethod());
}
TR_YesNoMaybe TR::VPFixedClass::isArray()
{
if (*_sig == '[')
return TR_yes;
return TR_no;
}
const char *TR::VPUnresolvedClass::getClassSignature(int32_t &len)
{
len = _len;
return _sig;
}
TR::VPClassType *TR::VPUnresolvedClass::getArrayClass(OMR::ValuePropagation *vp)
{
char *arraySig = (char *)vp->trMemory()->allocateStackMemory(_len+2);
arraySig[0] = '[';
arraySig[_len+1] = 0;
memcpy(arraySig+1, _sig, _len);
return TR::VPUnresolvedClass::create(vp, arraySig, _len+1, _method);
}
bool TR::VPUnresolvedClass::isReferenceArray(TR::Compilation *comp)
{
return _sig[0] == '[' && (_sig[1] == '[' || _sig[1] == 'L' || _sig[1] == 'Q');
}
bool TR::VPUnresolvedClass::isPrimitiveArray(TR::Compilation *comp)
{
return _sig[0] == '[' && _sig[1] != '[' && _sig[1] != 'L' && _sig[1] != 'Q';
}
bool TR::VPNullObject::isNullObject()
{
return true;
}
bool TR::VPNonNullObject::isNonNullObject()
{
return true;
}
bool TR::VPPreexistentObject::isPreexistentObject()
{
return true;
}
TR::VPArrayInfo *TR::VPArrayInfo::getArrayInfo()
{
return this;
}
TR_YesNoMaybe TR::VPObjectLocation::isWithin(VPObjectLocationKind area)
{
if (isKindSubset(_kind, area))
return TR_yes;
else if ((_kind & area) != 0)
return TR_maybe;
else
return TR_no;
}
TR_YesNoMaybe TR::VPObjectLocation::isStackObject()
{
return isWithin(StackObject);
}
TR_YesNoMaybe TR::VPObjectLocation::isHeapObject()
{
return isWithin(HeapObject);
}
TR_YesNoMaybe TR::VPObjectLocation::isClassObject()
{
return isWithin(ClassObject);
}
TR_YesNoMaybe TR::VPObjectLocation::isJavaLangClassObject()
{
return isWithin(JavaLangClassObject);
}
TR_YesNoMaybe TR::VPObjectLocation::isJ9ClassObject()
{
return isWithin(J9ClassObject);
}
TR::VPRelation *TR::VPLessThanOrEqual::getComplement(OMR::ValuePropagation *vp)
{
TR::VPRelation *rel = TR::VPGreaterThanOrEqual::create(vp, -increment());
if (hasArtificialIncrement())
rel->setHasArtificialIncrement();
return rel;
}
TR::VPRelation *TR::VPGreaterThanOrEqual::getComplement(OMR::ValuePropagation *vp)
{
TR::VPRelation *rel = TR::VPLessThanOrEqual::create(vp, -increment());
if (hasArtificialIncrement())
rel->setHasArtificialIncrement();
return rel;
}
TR::VPRelation *TR::VPEqual::getComplement(OMR::ValuePropagation *vp)
{
if (increment() == 0)
return this;
return TR::VPEqual::create(vp, -increment());
}
TR::VPRelation *TR::VPNotEqual::getComplement(OMR::ValuePropagation *vp)
{
if (increment() == 0)
return this;
return TR::VPNotEqual::create(vp, -increment());
}
// ***************************************************************************
//
// Creation of Value Propagation Constraints
//
// ***************************************************************************
TR::VPConstraint *TR::VPConstraint::create(OMR::ValuePropagation *vp, const char *sig, int32_t len, TR_ResolvedMethod *method, bool isFixedClass)
{
// Create a constraint if possible from any arbitrary signature
//
switch (sig[0])
{
case 'L':
case 'Q':
case '[':
return TR::VPClassType::create(vp, sig, len, method, isFixedClass);
case 'B':
return TR::VPIntRange::create(vp, TR::Int8, TR_no /* signed */);
case 'Z':
return TR::VPIntRange::create(vp, TR::Int8, TR_yes /* unsigned */); // FIXME: we can probably do 0/1 here
case 'C':
return TR::VPIntRange::create(vp, TR::Int16, TR_yes /* unsigned */);
case 'S':
return TR::VPIntRange::create(vp, TR::Int16, TR_no /* signed */);
}
return NULL;
}
TR::VPShortConst *TR::VPShortConst::create(OMR::ValuePropagation *vp, int16_t v)
{
int32_t hash = ((uint32_t)v) % VP_HASH_TABLE_SIZE;
TR::VPShortConst * constraint;
OMR::ValuePropagation::ConstraintsHashTableEntry *entry;
for (entry = vp->_constraintsHashTable[hash]; entry; entry = entry->next)
{
constraint = entry->constraint->asShortConst();
if (constraint && constraint->getShort() == v)
return constraint;
}
constraint = new (vp->trStackMemory()) TR::VPShortConst(v);
vp->addConstraint(constraint,hash);
return constraint;
}
TR::VPIntConst *TR::VPIntConst::create(OMR::ValuePropagation *vp, int32_t v)
{
// If the constant is zero, return the cached constraint
//
if (v == 0)
return vp->_constantZeroConstraint;
// If the constraint does not already exist, create it
//
int32_t hash = ((uint32_t)v) % VP_HASH_TABLE_SIZE;
TR::VPIntConst *constraint;
OMR::ValuePropagation::ConstraintsHashTableEntry *entry;
for (entry = vp->_constraintsHashTable[hash]; entry; entry = entry->next)
{
constraint = entry->constraint->asIntConst();
if (constraint && constraint->getInt() == v)
return constraint;
}
constraint = new (vp->trStackMemory()) TR::VPIntConst(v);
vp->addConstraint(constraint, hash);
return constraint;
}
TR::VPConstraint *TR::VPShortConst::createExclusion(OMR::ValuePropagation *vp, int16_t v)
{
if (v == TR::getMinSigned<TR::Int16>())
return TR::VPShortRange::create(vp,v+1,static_cast<int16_t>(TR::getMaxSigned<TR::Int16>()));
if (v == TR::getMaxSigned<TR::Int16>())
return TR::VPShortRange::create(vp,static_cast<int16_t>(TR::getMinSigned<TR::Int16>()),v-1);
return TR::VPMergedConstraints::create(vp, TR::VPShortRange::create(vp,static_cast<int16_t>(TR::getMinSigned<TR::Int16>()),v-1),TR::VPShortRange::create(vp,v+1,static_cast<int16_t>(TR::getMaxSigned<TR::Int16>())));
}
TR::VPConstraint *TR::VPIntConst::createExclusion(OMR::ValuePropagation *vp, int32_t v)
{
if (v == TR::getMinSigned<TR::Int32>())
return TR::VPIntRange::create(vp, v+1, static_cast<int32_t>(TR::getMaxSigned<TR::Int32>()));
if (v == TR::getMaxSigned<TR::Int32>())
return TR::VPIntRange::create(vp, static_cast<int32_t>(TR::getMinSigned<TR::Int32>()), v-1);
return TR::VPMergedConstraints::create(vp, TR::VPIntRange::create(vp, static_cast<int32_t>(TR::getMinSigned<TR::Int32>()), v-1), TR::VPIntRange::create(vp, v+1, static_cast<int32_t>(TR::getMaxSigned<TR::Int32>())));
}
TR::VPShortConstraint * TR::VPShortRange::create(OMR::ValuePropagation * vp, int16_t low, int16_t high, TR_YesNoMaybe canOverflow)
{
if (low == TR::getMinSigned<TR::Int16>() && high == TR::getMaxSigned<TR::Int16>())
return NULL;
if (low == high)
return TR::VPShortConst::create(vp,low);
uint32_t uint32low = (uint32_t)low;
uint32_t uint32high = (uint32_t)high;
int32_t hash = ((uint32low<<8)+uint32high) % VP_HASH_TABLE_SIZE;
TR::VPShortRange *constraint;
OMR::ValuePropagation::ConstraintsHashTableEntry *entry;
for(entry = vp->_constraintsHashTable[hash]; entry; entry = entry->next)
{
constraint = entry->constraint->asShortRange();
if(constraint &&
constraint->_low == low &&
constraint->_high == high &&
constraint->_overflow == canOverflow)
return constraint;
}
constraint = new (vp->trStackMemory()) TR::VPShortRange(low,high);
constraint->setCanOverflow(canOverflow);
vp->addConstraint(constraint,hash);
return constraint;
}
TR::VPShortConstraint *TR::VPShortRange::create(OMR::ValuePropagation *vp)
{
return TR::VPShortRange::createWithPrecision(vp, VP_UNDEFINED_PRECISION);
}
TR::VPShortConstraint *TR::VPShortRange::createWithPrecision(OMR::ValuePropagation *vp, int32_t precision, bool isNonNegative)
{
int64_t lo, hi;
constrainRangeByPrecision(TR::getMinSigned<TR::Int16>(), TR::getMaxSigned<TR::Int16>(), precision, lo, hi, isNonNegative);
return TR::VPShortRange::create(vp, static_cast<int16_t>(lo), static_cast<int16_t>(hi));
}
TR::VPIntConstraint *TR::VPIntRange::create(OMR::ValuePropagation *vp, int32_t low, int32_t high, TR_YesNoMaybe canOverflow)
{
if (low == TR::getMinSigned<TR::Int32>() && high == TR::getMaxSigned<TR::Int32>())
return NULL;
// if (isUnsigned &&
// ((uint32_t)low == TR::getMinUnsigned<TR::Int32>() && (uint32_t)high == TR::getMaxUnsigned<TR::Int32>()))
// return NULL;
if (low == high)
return TR::VPIntConst::create(vp, low);
// If the constraint does not already exist, create it
//