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.codegen.CompilerConstants;

    29 import jdk.nashorn.internal.codegen.types.Type;

    30 import jdk.nashorn.internal.ir.visitor.NodeVisitor;

    31 import jdk.nashorn.internal.runtime.Scope;

    32 

    33 /**

    34  * Synthetic AST node that represents loading of the scope object and invocation of the {@link Scope#getSplitState()}

    35  * method on it. It has no JavaScript source representation and only occurs in synthetic functions created by

    36  * the split-into-functions transformation.

    37  */

    38 public final class GetSplitState extends Expression {

    39     private static final long serialVersionUID = 1L;

    40 

    41     /** The sole instance of this AST node. */

    42     public final static GetSplitState INSTANCE = new GetSplitState();

    43 

    44     private GetSplitState() {

    45         super(NO_TOKEN, NO_FINISH);

    46     }

    47 

    48     @Override

    49     public Type getType() {

    50         return Type.INT;

    51     }

    52 

    53     @Override

    54     public Node accept(final NodeVisitor<? extends LexicalContext> visitor) {

    55         return visitor.enterGetSplitState(this) ? visitor.leaveGetSplitState(this) : this;

    56     }

    57 

    58     @Override

    59     public void toString(final StringBuilder sb, final boolean printType) {

    60         if (printType) {

    61             sb.append("{I}");

    62         }

    63         sb.append(CompilerConstants.SCOPE.symbolName()).append('.').append(Scope.GET_SPLIT_STATE.name()).append("()");

    64     }

    65 

    66     private Object readResolve() {

    67         return INSTANCE;

    68     }

    69 }