| /* |
| * 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. |
| */ |
| abstract Label getTargetLabel(final BreakableNode target); |
| |
| /** |
| * Returns the label this jump statement targets. |
| * @param lc the lexical context |
| * @return the label this jump statement targets. |
| */ |
| public Label getTargetLabel(final LexicalContext lc) { |
| return getTargetLabel(getTarget(lc)); |
| } |
| |
| /** |
| * Returns the limit node for popping scopes when this jump statement is effected. |
| * @param lc the current lexical context |
| * @return the limit node for popping scopes when this jump statement is effected. |
| */ |
| public LexicalContextNode getPopScopeLimit(final LexicalContext lc) { |
| // In most cases (break and continue) this is equal to the target. |
| return getTarget(lc); |
| } |
| |
| @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; |
| } |
| } |