| author | lagergren |
| Fri, 19 Apr 2013 16:11:16 +0200 | |
| changeset 17233 | 72ccf78a8216 |
| parent 16530 | 201d682e75f4 |
| child 17523 | cb4a7c901e0d |
| permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2010, 2013, 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. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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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 jdk.nashorn.internal.ir; |
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import java.util.ArrayList; |
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import java.util.Collections; |
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import java.util.List; |
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16240
e1468b33e201
8008239: Unpublicized parts of the code generator package that were only package internal.
lagergren
parents:
16160
diff
changeset
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import jdk.nashorn.internal.codegen.Label; |
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import jdk.nashorn.internal.ir.annotations.Immutable; |
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import jdk.nashorn.internal.ir.visitor.NodeVisitor; |
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import jdk.nashorn.internal.runtime.Source; |
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/** |
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* IR representation of a SWITCH statement. |
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*/ |
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@Immutable |
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public final class SwitchNode extends BreakableNode {
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/** Switch expression. */ |
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private final Node expression; |
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/** Switch cases. */ |
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private final List<CaseNode> cases; |
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/** Switch default index. */ |
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private final int defaultCaseIndex; |
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/** Tag symbol. */ |
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private Symbol tag; |
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/** |
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* Constructor |
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* |
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* @param source the source |
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* @param token token |
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* @param finish finish |
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* @param expression switch expression |
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* @param cases cases |
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* @param defaultCase the default case node - null if none, otherwise has to be present in cases list |
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*/ |
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public SwitchNode(final Source source, final long token, final int finish, final Node expression, final List<CaseNode> cases, final CaseNode defaultCase) {
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super(source, token, finish, new Label("switch_break"));
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this.expression = expression; |
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this.cases = cases; |
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this.defaultCaseIndex = defaultCase == null ? -1 : cases.indexOf(defaultCase); |
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} |
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private SwitchNode(final SwitchNode switchNode, final Node expression, final List<CaseNode> cases, final int defaultCase) {
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super(switchNode); |
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this.expression = expression; |
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this.cases = cases; |
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this.defaultCaseIndex = defaultCase; |
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this.tag = switchNode.getTag(); //TODO are symbols inhereted as references? |
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} |
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@Override |
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public Node ensureUniqueLabels(final LexicalContext lc) {
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final List<CaseNode> newCases = new ArrayList<>(); |
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for (final CaseNode caseNode : cases) {
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newCases.add(new CaseNode(caseNode, caseNode.getTest(), caseNode.getBody())); |
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} |
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return Node.replaceInLexicalContext(lc, this, new SwitchNode(this, expression, newCases, defaultCaseIndex)); |
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} |
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@Override |
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public boolean isTerminal() {
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//there must be a default case, and that including all other cases must terminate |
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if (!cases.isEmpty() && defaultCaseIndex != -1) {
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for (final CaseNode caseNode : cases) {
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if (!caseNode.isTerminal()) {
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return false; |
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} |
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} |
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return true; |
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} |
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return false; |
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} |
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@Override |
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public Node accept(final LexicalContext lc, final NodeVisitor visitor) {
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if (visitor.enterSwitchNode(this)) {
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return visitor.leaveSwitchNode( |
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setExpression(visitor.getLexicalContext(), expression.accept(visitor)). |
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setCases(visitor.getLexicalContext(), Node.accept(visitor, CaseNode.class, cases), defaultCaseIndex)); |
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} |
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return this; |
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} |
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@Override |
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public void toString(final StringBuilder sb) {
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sb.append("switch (");
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expression.toString(sb); |
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sb.append(')');
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} |
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/** |
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* Return the case node that is default case |
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* @return default case or null if none |
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*/ |
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public CaseNode getDefaultCase() {
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return defaultCaseIndex == -1 ? null : cases.get(defaultCaseIndex); |
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} |
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/** |
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* Get the cases in this switch |
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* @return a list of case nodes |
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*/ |
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public List<CaseNode> getCases() {
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return Collections.unmodifiableList(cases); |
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} |
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/** |
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* Replace case nodes with new list. the cases have to be the same |
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* and the default case index the same. This is typically used |
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* by NodeVisitors who perform operations on every case node |
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* @param lc lexical context |
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* @param cases list of cases |
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* @return new switcy node or same if no state was changed |
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*/ |
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public SwitchNode setCases(final LexicalContext lc, final List<CaseNode> cases) {
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return setCases(lc, cases, defaultCaseIndex); |
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} |
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private SwitchNode setCases(final LexicalContext lc, final List<CaseNode> cases, final int defaultCaseIndex) {
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if (this.cases == cases) {
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return this; |
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} |
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return Node.replaceInLexicalContext(lc, this, new SwitchNode(this, expression, cases, defaultCaseIndex)); |
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} |
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/** |
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* Set or reset the list of cases in this switch |
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* @param lc lexical context |
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* @param cases a list of cases, case nodes |
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* @param defaultCase a case in the list that is the default - must be in the list or class will assert |
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* @return new switch node or same if no state was changed |
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*/ |
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public SwitchNode setCases(final LexicalContext lc, final List<CaseNode> cases, final CaseNode defaultCase) {
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return setCases(lc, cases, defaultCase == null ? -1 : cases.indexOf(defaultCase)); |
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} |
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/** |
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* Return the expression to switch on |
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* @return switch expression |
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*/ |
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public Node getExpression() {
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return expression; |
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} |
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/** |
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* Set or reset the expression to switch on |
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* @param lc lexical context |
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* @param expression switch expression |
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* @return new switch node or same if no state was changed |
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*/ |
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public SwitchNode setExpression(final LexicalContext lc, final Node expression) {
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if (this.expression == expression) {
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return this; |
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} |
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return Node.replaceInLexicalContext(lc, this, new SwitchNode(this, expression, cases, defaultCaseIndex)); |
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} |
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/** |
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* Get the tag symbol for this switch. The tag symbol is where |
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* the switch expression result is stored |
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* @return tag symbol |
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*/ |
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public Symbol getTag() {
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return tag; |
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} |
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/** |
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* Set the tag symbol for this switch. The tag symbol is where |
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* the switch expression result is stored |
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* @param tag a symbol |
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*/ |
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public void setTag(final Symbol tag) {
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this.tag = tag; |
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} |
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} |
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