GetSplitState.java revision 1152:5f6a840fc19d 
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
26package jdk.nashorn.internal.ir;
27
28import jdk.nashorn.internal.codegen.CompilerConstants;
29import jdk.nashorn.internal.codegen.types.Type;
30import jdk.nashorn.internal.ir.visitor.NodeVisitor;
31import 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 */
38public 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}
70