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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;
+ }
+}