| /* |
| * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package jdk.nashorn.internal.ir; |
| |
| import jdk.nashorn.internal.ir.annotations.Immutable; |
| import jdk.nashorn.internal.ir.visitor.NodeVisitor; |
| |
| /** |
| * IR representation for a labeled statement. It implements JoinPredecessor to hold conversions that need to be effected |
| * when the block exits normally, but is also targeted by a break statement that might bring different local variable |
| * types to the join at the break point. |
| */ |
| @Immutable |
| public final class LabelNode extends LexicalContextStatement implements JoinPredecessor { |
| private static final long serialVersionUID = 1L; |
| |
| /** Label ident. */ |
| private final String labelName; |
| |
| /** Statements. */ |
| private final Block body; |
| |
| private final LocalVariableConversion localVariableConversion; |
| |
| /** |
| * Constructor |
| * |
| * @param lineNumber line number |
| * @param token token |
| * @param finish finish |
| * @param labelName label name |
| * @param body body of label node |
| */ |
| public LabelNode(final int lineNumber, final long token, final int finish, final String labelName, final Block body) { |
| super(lineNumber, token, finish); |
| |
| this.labelName = labelName; |
| this.body = body; |
| this.localVariableConversion = null; |
| } |
| |
| private LabelNode(final LabelNode labelNode, final String labelName, final Block body, final LocalVariableConversion localVariableConversion) { |
| super(labelNode); |
| this.labelName = labelName; |
| this.body = body; |
| this.localVariableConversion = localVariableConversion; |
| } |
| |
| @Override |
| public boolean isTerminal() { |
| return body.isTerminal(); |
| } |
| |
| @Override |
| public Node accept(final LexicalContext lc, final NodeVisitor<? extends LexicalContext> visitor) { |
| if (visitor.enterLabelNode(this)) { |
| return visitor.leaveLabelNode(setBody(lc, (Block)body.accept(visitor))); |
| } |
| |
| return this; |
| } |
| |
| @Override |
| public void toString(final StringBuilder sb, final boolean printType) { |
| sb.append(labelName).append(':'); |
| } |
| |
| /** |
| * Get the body of the node |
| * @return the body |
| */ |
| public Block getBody() { |
| return body; |
| } |
| |
| /** |
| * Reset the body of the node |
| * @param lc lexical context |
| * @param body new body |
| * @return new for node if changed or existing if not |
| */ |
| public LabelNode setBody(final LexicalContext lc, final Block body) { |
| if (this.body == body) { |
| return this; |
| } |
| return Node.replaceInLexicalContext(lc, this, new LabelNode(this, labelName, body, localVariableConversion)); |
| } |
| |
| /** |
| * Get the label name |
| * @return the label |
| */ |
| public String getLabelName() { |
| return labelName; |
| } |
| |
| @Override |
| public LocalVariableConversion getLocalVariableConversion() { |
| return localVariableConversion; |
| } |
| |
| @Override |
| public LabelNode setLocalVariableConversion(final LexicalContext lc, final LocalVariableConversion localVariableConversion) { |
| if(this.localVariableConversion == localVariableConversion) { |
| return this; |
| } |
| return Node.replaceInLexicalContext(lc, this, new LabelNode(this, labelName, body, localVariableConversion)); |
| } |
| } |