Mercurial > hg > shenandoah-preopenjdk-archive > openjdk8 > nashorn
view src/jdk/nashorn/internal/ir/JumpStatement.java @ 1060:8c51767d534d
8059843: Make AST serializable
Reviewed-by: hannesw, lagergren
author | attila |
---|---|
date | Fri, 17 Oct 2014 14:24:26 +0200 |
parents | 3e7d0b0b855a |
children |
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/* * 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.codegen.Label; /** * Common base class for jump statements (e.g. {@code break} and {@code continue}). */ public abstract class JumpStatement extends Statement implements JoinPredecessor { private static final long serialVersionUID = 1L; private final String labelName; private final LocalVariableConversion conversion; /** * Constructor * * @param lineNumber line number * @param token token * @param finish finish * @param labelName label name for break or null if none */ protected JumpStatement(final int lineNumber, final long token, final int finish, final String labelName) { super(lineNumber, token, finish); this.labelName = labelName; this.conversion = null; } /** * Copy constructor. * @param jumpStatement the original jump statement. * @param conversion a new local variable conversion. */ protected JumpStatement(final JumpStatement jumpStatement, final LocalVariableConversion conversion) { super(jumpStatement); this.labelName = jumpStatement.labelName; this.conversion = conversion; } @Override public boolean hasGoto() { return true; } /** * Get the label name for this break node * @return label name, or null if none */ public String getLabelName() { return labelName; } @Override public void toString(final StringBuilder sb, final boolean printType) { sb.append(getStatementName()); if (labelName != null) { sb.append(' ').append(labelName); } } abstract String getStatementName(); /** * Finds the target for this jump statement in a lexical context. * @param lc the lexical context * @return the target, or null if not found */ public abstract BreakableNode getTarget(final LexicalContext lc); /** * Returns the label corresponding to this kind of jump statement (either a break or continue label) in the target. * @param target the target. Note that it need not be the target of this jump statement, as the method can retrieve * a label on any passed target as long as the target has a label of the requisite kind. Of course, it is advisable * to invoke the method on a jump statement that targets the breakable. * @return the label of the target corresponding to the kind of jump statement. * @throws ClassCastException if invoked on the kind of breakable node that this jump statement is not prepared to * handle. */ public abstract Label getTargetLabel(final BreakableNode target); @Override public JumpStatement setLocalVariableConversion(final LexicalContext lc, final LocalVariableConversion conversion) { if(this.conversion == conversion) { return this; } return createNewJumpStatement(conversion); } abstract JumpStatement createNewJumpStatement(LocalVariableConversion newConversion); @Override public LocalVariableConversion getLocalVariableConversion() { return conversion; } }