1 /*
   2  * Copyright (c) 2010, 2013, 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 java.io.IOException;
  29 import java.io.NotSerializableException;
  30 import java.io.ObjectOutputStream;
  31 import jdk.nashorn.internal.codegen.CompileUnit;
  32 import jdk.nashorn.internal.ir.annotations.Immutable;
  33 import jdk.nashorn.internal.ir.visitor.NodeVisitor;
  34 
  35 /**
  36  * Node indicating code is split across classes.
  37  */
  38 @Immutable
  39 public class SplitNode extends LexicalContextStatement implements CompileUnitHolder {
  40     private static final long serialVersionUID = 1L;
  41 
  42     /** Split node method name. */
  43     private final String name;
  44 
  45     /** Compilation unit. */
  46     private final CompileUnit compileUnit;
  47 
  48     /** Body of split code. */
  49     private final Block body;
  50 
  51     /**
  52      * Constructor
  53      *
  54      * @param name        name of split node
  55      * @param body        body of split code
  56      * @param compileUnit compile unit to use for the body
  57      */
  58     public SplitNode(final String name, final Block body, final CompileUnit compileUnit) {
  59         super(body.getFirstStatementLineNumber(), body.getToken(), body.getFinish());
  60         this.name        = name;
  61         this.body        = body;
  62         this.compileUnit = compileUnit;
  63     }
  64 
  65     private SplitNode(final SplitNode splitNode, final Block body, final CompileUnit compileUnit) {
  66         super(splitNode);
  67         this.name        = splitNode.name;
  68         this.body        = body;
  69         this.compileUnit = compileUnit;
  70     }
  71 
  72     /**
  73      * Get the body for this split node - i.e. the actual code it encloses
  74      * @return body for split node
  75      */
  76     public Block getBody() {
  77         return body;
  78     }
  79 
  80     private SplitNode setBody(final LexicalContext lc, final Block body) {
  81         if (this.body == body) {
  82             return this;
  83         }
  84         return Node.replaceInLexicalContext(lc, this, new SplitNode(this, body, compileUnit));
  85     }
  86 
  87     @Override
  88     public Node accept(final LexicalContext lc, final NodeVisitor<? extends LexicalContext> visitor) {
  89         if (visitor.enterSplitNode(this)) {
  90             return visitor.leaveSplitNode(setBody(lc, (Block)body.accept(visitor)));
  91         }
  92         return this;
  93     }
  94 
  95     @Override
  96     public void toString(final StringBuilder sb, final boolean printType) {
  97         sb.append("<split>(");
  98         sb.append(compileUnit.getClass().getSimpleName());
  99         sb.append(") ");
 100         body.toString(sb, printType);
 101     }
 102 
 103     /**
 104      * Get the name for this split node
 105      * @return name
 106      */
 107     public String getName() {
 108         return name;
 109     }
 110 
 111     /**
 112      * Get the compile unit for this split node
 113      * @return compile unit
 114      */
 115     @Override
 116     public CompileUnit getCompileUnit() {
 117         return compileUnit;
 118     }
 119 
 120     /**
 121      * Set the compile unit for this split node
 122      * @param lc lexical context
 123      * @param compileUnit compile unit
 124      * @return new node if changed, otherwise same node
 125      */
 126     public SplitNode setCompileUnit(final LexicalContext lc, final CompileUnit compileUnit) {
 127         if (this.compileUnit == compileUnit) {
 128             return this;
 129         }
 130         return Node.replaceInLexicalContext(lc, this, new SplitNode(this, body, compileUnit));
 131     }
 132 
 133     private void writeObject(final ObjectOutputStream out) throws IOException {
 134         // We are only serializing the AST after we run SplitIntoFunctions; no SplitNodes can remain for the
 135         // serialization.
 136         throw new NotSerializableException(getClass().getName());
 137     }
 138 }