LocalStateRestorationInfo.java revision 953:221a84ef44c0 
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
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23 * questions.
24 */
25package jdk.nashorn.internal.codegen;
26
27import jdk.nashorn.internal.codegen.types.Type;
28
29/**
30 * Encapsulates the information for restoring the local state when continuing execution after a rewrite triggered by
31 * an optimistic assumption failure. An instance of this class is specific to a program point.
32 *
33 */
34public class LocalStateRestorationInfo {
35    private final Type[] localVariableTypes;
36    private final int[] stackLoads;
37
38    LocalStateRestorationInfo(final Type[] localVariableTypes, final int[] stackLoads) {
39        this.localVariableTypes = localVariableTypes;
40        this.stackLoads = stackLoads;
41    }
42
43    /**
44     * Returns the types of the local variables at the continuation of a program point.
45     * @return the types of the local variables at the continuation of a program point.
46     */
47    public Type[] getLocalVariableTypes() {
48        return localVariableTypes.clone();
49    }
50
51    /**
52     * Returns the indices of local variables that need to be loaded on stack before jumping to the continuation of the
53     * program point.
54     * @return the indices of local variables that need to be loaded on stack.
55     */
56    public int[] getStackLoads() {
57        return stackLoads.clone();
58    }
59}
60