1 /* 2 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package jdk.nashorn.internal.ir; 27 28 import jdk.nashorn.internal.ir.annotations.Ignore; 29 import jdk.nashorn.internal.ir.visitor.NodeVisitor; 30 31 /** 32 * Synthetic AST node that represents return from a split fragment of a split function for control flow reasons (break 33 * or continue into a target outside the current fragment). It has no JavaScript source representation and only occurs 34 * in synthetic functions created by the split-into-functions transformation. It is different from a return node in 35 * that the return value is irrelevant, and doesn't affect the function's return type calculation. 36 */ 37 public final class SplitReturn extends Statement { 38 private static final long serialVersionUID = 1L; 39 40 /** The sole instance of this AST node. */ 41 @Ignore 42 public static final SplitReturn INSTANCE = new SplitReturn(); 43 44 private SplitReturn() { 45 super(NO_LINE_NUMBER, NO_TOKEN, NO_FINISH); 46 } 47 48 @Override 49 public boolean isTerminal() { 50 return true; 51 } 52 53 @Override 54 public Node accept(final NodeVisitor<? extends LexicalContext> visitor) { 55 return visitor.enterSplitReturn(this) ? visitor.leaveSplitReturn(this) : this; 56 } 57 58 @Override 59 public void toString(final StringBuilder sb, final boolean printType) { 60 sb.append(":splitreturn;"); 61 } 62 63 private Object readResolve() { 64 return INSTANCE; 65 } 66 }