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/*
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* Copyright (c) 2012, 2016, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package org.graalvm.compiler.core.common.type;
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import java.util.AbstractList;
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import java.util.Objects;
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import java.util.RandomAccess;
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import jdk.vm.ci.meta.Constant;
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import jdk.vm.ci.meta.JavaConstant;
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import jdk.vm.ci.meta.JavaKind;
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import jdk.vm.ci.meta.MetaAccessProvider;
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import jdk.vm.ci.meta.ResolvedJavaType;
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/**
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* Type describing all pointers to Java objects.
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*/
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public abstract class AbstractObjectStamp extends AbstractPointerStamp {
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private final ResolvedJavaType type;
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private final boolean exactType;
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protected AbstractObjectStamp(ResolvedJavaType type, boolean exactType, boolean nonNull, boolean alwaysNull) {
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super(nonNull, alwaysNull);
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this.type = type;
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this.exactType = exactType;
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}
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protected abstract AbstractObjectStamp copyWith(ResolvedJavaType newType, boolean newExactType, boolean newNonNull, boolean newAlwaysNull);
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@Override
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protected final AbstractPointerStamp copyWith(boolean newNonNull, boolean newAlwaysNull) {
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return copyWith(type, exactType, newNonNull, newAlwaysNull);
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}
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@Override
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public Stamp unrestricted() {
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return copyWith(null, false, false, false);
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}
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@Override
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public Stamp empty() {
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return copyWith(null, true, true, false);
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}
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@Override
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public Stamp constant(Constant c, MetaAccessProvider meta) {
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JavaConstant jc = (JavaConstant) c;
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ResolvedJavaType constType = jc.isNull() ? null : meta.lookupJavaType(jc);
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return copyWith(constType, jc.isNonNull(), jc.isNonNull(), jc.isNull());
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}
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@Override
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public boolean hasValues() {
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return !exactType || (type != null && (isConcreteType(type)));
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}
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@Override
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public JavaKind getStackKind() {
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return JavaKind.Object;
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}
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@Override
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public ResolvedJavaType javaType(MetaAccessProvider metaAccess) {
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if (type != null) {
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return type;
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}
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return metaAccess.lookupJavaType(Object.class);
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}
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public ResolvedJavaType type() {
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return type;
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}
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public boolean isExactType() {
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return exactType && type != null;
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}
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protected void appendString(StringBuilder str) {
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if (this.isEmpty()) {
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str.append(" empty");
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} else {
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str.append(nonNull() ? "!" : "").append(exactType ? "#" : "").append(' ').append(type == null ? "-" : type.getName()).append(alwaysNull() ? " NULL" : "");
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}
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}
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@Override
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public Stamp meet(Stamp otherStamp) {
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if (this == otherStamp) {
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return this;
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}
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AbstractObjectStamp other = (AbstractObjectStamp) otherStamp;
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if (isEmpty()) {
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return other;
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} else if (other.isEmpty()) {
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return this;
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}
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ResolvedJavaType meetType;
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boolean meetExactType;
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boolean meetNonNull;
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boolean meetAlwaysNull;
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if (other.alwaysNull()) {
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meetType = type();
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meetExactType = exactType;
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meetNonNull = false;
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meetAlwaysNull = alwaysNull();
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} else if (alwaysNull()) {
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meetType = other.type();
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meetExactType = other.exactType;
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meetNonNull = false;
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meetAlwaysNull = other.alwaysNull();
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} else {
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meetType = meetTypes(type(), other.type());
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meetExactType = exactType && other.exactType;
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if (meetExactType && type != null && other.type != null) {
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// meeting two valid exact types may result in a non-exact type
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meetExactType = Objects.equals(meetType, type) && Objects.equals(meetType, other.type);
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}
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meetNonNull = nonNull() && other.nonNull();
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meetAlwaysNull = false;
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}
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if (Objects.equals(meetType, type) && meetExactType == exactType && meetNonNull == nonNull() && meetAlwaysNull == alwaysNull()) {
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return this;
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} else if (Objects.equals(meetType, other.type) && meetExactType == other.exactType && meetNonNull == other.nonNull() && meetAlwaysNull == other.alwaysNull()) {
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return other;
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} else {
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return copyWith(meetType, meetExactType, meetNonNull, meetAlwaysNull);
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}
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}
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@Override
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public Stamp join(Stamp otherStamp) {
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return join0(otherStamp, false);
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}
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/**
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* Returns the stamp representing the type of this stamp after a cast to the type represented by
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* the {@code to} stamp. While this is very similar to a {@link #join} operation, in the case
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* where both types are not obviously related, the cast operation will prefer the type of the
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* {@code to} stamp. This is necessary as long as ObjectStamps are not able to accurately
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* represent intersection types.
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*
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* For example when joining the {@link RandomAccess} type with the {@link AbstractList} type,
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* without intersection types, this would result in the most generic type ({@link Object} ). For
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* this reason, in some cases a {@code castTo} operation is preferable in order to keep at least
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* the {@link AbstractList} type.
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*
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* @param other the stamp this stamp should be casted to
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* @return the new improved stamp or {@code null} if this stamp cannot be improved
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*/
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@Override
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public Stamp improveWith(Stamp other) {
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return join0(other, true);
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}
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private Stamp join0(Stamp otherStamp, boolean improve) {
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if (this == otherStamp) {
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return this;
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}
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AbstractObjectStamp other = (AbstractObjectStamp) otherStamp;
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if (isEmpty()) {
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return this;
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} else if (other.isEmpty()) {
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return other;
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}
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ResolvedJavaType joinType;
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boolean joinAlwaysNull = alwaysNull() || other.alwaysNull();
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boolean joinNonNull = nonNull() || other.nonNull();
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boolean joinExactType = exactType || other.exactType;
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if (Objects.equals(type, other.type)) {
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joinType = type;
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} else if (type == null && other.type == null) {
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joinType = null;
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} else if (type == null) {
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joinType = other.type;
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} else if (other.type == null) {
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joinType = type;
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} else {
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// both types are != null and different
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if (type.isAssignableFrom(other.type)) {
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joinType = other.type;
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if (exactType) {
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joinAlwaysNull = true;
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}
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} else if (other.type.isAssignableFrom(type)) {
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joinType = type;
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if (other.exactType) {
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joinAlwaysNull = true;
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}
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} else {
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if (improve) {
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joinType = type;
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joinExactType = exactType;
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} else {
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joinType = null;
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}
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if (joinExactType || (!isInterfaceOrArrayOfInterface(type) && !isInterfaceOrArrayOfInterface(other.type))) {
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joinAlwaysNull = true;
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}
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}
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}
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if (joinAlwaysNull) {
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joinType = null;
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joinExactType = false;
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}
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if (joinExactType && joinType == null) {
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return empty();
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}
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if (joinAlwaysNull && joinNonNull) {
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return empty();
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} else if (joinExactType && !isConcreteType(joinType)) {
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return empty();
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}
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if (Objects.equals(joinType, type) && joinExactType == exactType && joinNonNull == nonNull() && joinAlwaysNull == alwaysNull()) {
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return this;
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} else if (Objects.equals(joinType, other.type) && joinExactType == other.exactType && joinNonNull == other.nonNull() && joinAlwaysNull == other.alwaysNull()) {
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return other;
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} else {
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return copyWith(joinType, joinExactType, joinNonNull, joinAlwaysNull);
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}
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}
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private static boolean isInterfaceOrArrayOfInterface(ResolvedJavaType t) {
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return t.isInterface() || (t.isArray() && t.getElementalType().isInterface());
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}
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public static boolean isConcreteType(ResolvedJavaType type) {
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return !(type.isAbstract() && !type.isArray());
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}
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private static ResolvedJavaType meetTypes(ResolvedJavaType a, ResolvedJavaType b) {
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if (Objects.equals(a, b)) {
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return a;
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} else if (a == null || b == null) {
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return null;
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} else {
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// The `meetTypes` operation must be commutative. One way to achieve this is to totally
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// order the types and always call `meetOrderedNonNullTypes` in the same order. We
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// establish the order by first comparing the hash-codes for performance reasons, and
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// then comparing the internal names of the types.
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int hashA = a.getName().hashCode();
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int hashB = b.getName().hashCode();
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if (hashA < hashB) {
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return meetOrderedNonNullTypes(a, b);
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} else if (hashB < hashA) {
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return meetOrderedNonNullTypes(b, a);
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} else {
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int diff = a.getName().compareTo(b.getName());
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if (diff <= 0) {
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return meetOrderedNonNullTypes(a, b);
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} else {
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return meetOrderedNonNullTypes(b, a);
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}
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}
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}
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}
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private static ResolvedJavaType meetOrderedNonNullTypes(ResolvedJavaType a, ResolvedJavaType b) {
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ResolvedJavaType result = a.findLeastCommonAncestor(b);
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if (result.isJavaLangObject() && a.isInterface() && b.isInterface()) {
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// Both types are incompatible interfaces => search for first possible common
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// ancestor match among super interfaces.
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ResolvedJavaType[] interfacesA = a.getInterfaces();
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ResolvedJavaType[] interfacesB = b.getInterfaces();
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for (int i = 0; i < interfacesA.length; ++i) {
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ResolvedJavaType interface1 = interfacesA[i];
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for (int j = 0; j < interfacesB.length; ++j) {
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ResolvedJavaType interface2 = interfacesB[j];
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ResolvedJavaType leastCommon = meetTypes(interface1, interface2);
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if (leastCommon.isInterface()) {
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return leastCommon;
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}
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}
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}
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}
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return result;
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}
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@Override
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public int hashCode() {
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final int prime = 31;
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int result = 1;
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result = prime * result + super.hashCode();
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result = prime * result + (exactType ? 1231 : 1237);
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result = prime * result + ((type == null || type.isJavaLangObject()) ? 0 : type.hashCode());
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return result;
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}
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@Override
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public boolean equals(Object obj) {
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if (this == obj) {
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return true;
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}
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if (obj == null || getClass() != obj.getClass()) {
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return false;
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}
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AbstractObjectStamp other = (AbstractObjectStamp) obj;
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if (exactType != other.exactType) {
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return false;
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}
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// null == java.lang.Object
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if (type == null) {
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if (other.type != null && !other.type.isJavaLangObject()) {
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return false;
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}
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} else if (other.type == null) {
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if (type != null && !type.isJavaLangObject()) {
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return false;
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}
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} else if (!type.equals(other.type)) {
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return false;
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}
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return super.equals(other);
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}
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}
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