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/*
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* Copyright (c) 2014, 2019, 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 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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/**
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* Abstract base class of all pointer types.
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*/
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public abstract class AbstractPointerStamp extends Stamp {
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private final boolean nonNull;
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private final boolean alwaysNull;
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@Override
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public void accept(Visitor v) {
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v.visitBoolean(nonNull);
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v.visitBoolean(alwaysNull);
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}
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protected AbstractPointerStamp(boolean nonNull, boolean alwaysNull) {
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this.nonNull = nonNull;
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this.alwaysNull = alwaysNull;
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}
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public boolean nonNull() {
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assert !this.isEmpty() || nonNull;
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return nonNull;
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}
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public boolean alwaysNull() {
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return alwaysNull;
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}
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protected abstract AbstractPointerStamp copyWith(boolean newNonNull, boolean newAlwaysNull);
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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 + (alwaysNull ? 1231 : 1237);
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result = prime * result + (nonNull ? 1231 : 1237);
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return result;
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}
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protected Stamp defaultPointerJoin(Stamp stamp) {
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assert getClass() == stamp.getClass();
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AbstractPointerStamp other = (AbstractPointerStamp) stamp;
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boolean joinNonNull = this.nonNull || other.nonNull;
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boolean joinAlwaysNull = this.alwaysNull || other.alwaysNull;
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if (joinNonNull && joinAlwaysNull) {
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return empty();
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} else {
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return copyWith(joinNonNull, joinAlwaysNull);
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}
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}
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@Override
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public Stamp improveWith(Stamp other) {
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return join(other);
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}
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@Override
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public Stamp meet(Stamp stamp) {
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AbstractPointerStamp other = (AbstractPointerStamp) stamp;
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boolean meetNonNull = this.nonNull && other.nonNull;
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boolean meetAlwaysNull = this.alwaysNull && other.alwaysNull;
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return copyWith(meetNonNull, meetAlwaysNull);
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}
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@Override
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public Stamp unrestricted() {
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return copyWith(false, false);
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}
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public static Stamp pointerNonNull(Stamp stamp) {
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AbstractPointerStamp pointer = (AbstractPointerStamp) stamp;
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return pointer.asNonNull();
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}
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public static Stamp pointerMaybeNull(Stamp stamp) {
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AbstractPointerStamp pointer = (AbstractPointerStamp) stamp;
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return pointer.asMaybeNull();
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}
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public static Stamp pointerAlwaysNull(Stamp stamp) {
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AbstractPointerStamp pointer = (AbstractPointerStamp) stamp;
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return pointer.asAlwaysNull();
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}
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public AbstractPointerStamp asNonNull() {
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if (isEmpty()) {
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return this;
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}
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return copyWith(true, false);
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}
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public AbstractPointerStamp asMaybeNull() {
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if (isEmpty()) {
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return this;
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}
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return copyWith(false, false);
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}
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public Stamp asAlwaysNull() {
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if (isEmpty()) {
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return this;
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}
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return copyWith(false, true);
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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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AbstractPointerStamp other = (AbstractPointerStamp) obj;
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return this.alwaysNull == other.alwaysNull && this.nonNull == other.nonNull;
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}
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@Override
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public Constant asConstant() {
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if (alwaysNull) {
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return nullConstant();
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}
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return super.asConstant();
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}
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public JavaConstant nullConstant() {
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return JavaConstant.NULL_POINTER;
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}
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@Override
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public JavaKind getStackKind() {
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return JavaKind.Illegal;
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}
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}
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