--- old/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/ir/JumpStatement.java 2020-04-15 18:47:50.000000000 +0530 +++ /dev/null 2020-04-15 18:47:50.000000000 +0530 @@ -1,139 +0,0 @@ -/* - * 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; - } -}