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 package jdk.nashorn.internal.codegen;
  26 
  27 import 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  */
  34 public 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 }