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src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/runtime/Scope.java

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   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.runtime;
  27 
  28 import static jdk.nashorn.internal.codegen.CompilerConstants.interfaceCallNoLookup;
  29 
  30 import jdk.nashorn.internal.codegen.CompilerConstants;
  31 
  32 /**
  33  * Interface implemented by {@link ScriptObject}s that act as scope.
  34  */
  35 public interface Scope {
  36 
  37     /** Method handle that points to {@link Scope#getSplitState}. */
  38     public static final CompilerConstants.Call GET_SPLIT_STATE = interfaceCallNoLookup(Scope.class, "getSplitState", int.class);



  39 


  40     /** Method handle that points to {@link Scope#setSplitState(int)}. */
  41     public static final CompilerConstants.Call SET_SPLIT_STATE = interfaceCallNoLookup(Scope.class, "setSplitState", void.class, int.class);






















































  42 
  43     /**
  44      * Get the scope's split method state.
  45      * @return the current state

  46      */
  47     public int getSplitState();


  48 
  49     /**
  50      * Set the scope's split method state.
  51      * @param state the new state.











  52      */
  53     public void setSplitState(int state);


  54 }
   1 /*
   2  * Copyright (c) 2010, 2015, 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.runtime;
  27 
  28 import static jdk.nashorn.internal.codegen.CompilerConstants.virtualCallNoLookup;
  29 
  30 import jdk.nashorn.internal.codegen.CompilerConstants;
  31 
  32 /**
  33  * A {@link ScriptObject} subclass for objects that act as scope.
  34  */
  35 public class Scope extends ScriptObject {
  36 
  37     // Flag to indicate that a split method issued a return statement
  38     private int splitState = -1;
  39 
  40     /** This is updated only in debug mode - counts number of {@code ScriptObject} instances created that are scope */
  41     private static int count;
  42 
  43     /** Method handle that points to {@link Scope#getSplitState}. */
  44     public static final CompilerConstants.Call GET_SPLIT_STATE = virtualCallNoLookup(Scope.class, "getSplitState", int.class);
  45     /** Method handle that points to {@link Scope#setSplitState(int)}. */
  46     public static final CompilerConstants.Call SET_SPLIT_STATE = virtualCallNoLookup(Scope.class, "setSplitState", void.class, int.class);
  47 
  48     /**
  49      * Constructor
  50      *
  51      * @param map initial property map
  52      */
  53     public Scope(final PropertyMap map) {
  54         super(map);
  55         if (Context.DEBUG) {
  56             count++;
  57         }
  58     }
  59 
  60     /**
  61      * Constructor
  62      *
  63      * @param proto parent scope
  64      * @param map   initial property map
  65      */
  66     public Scope(final ScriptObject proto, final PropertyMap map) {
  67         super(proto, map);
  68         if (Context.DEBUG) {
  69             count++;
  70         }
  71     }
  72 
  73     /**
  74      * Constructor
  75      *
  76      * @param map            property map
  77      * @param primitiveSpill primitive spill array
  78      * @param objectSpill    reference spill array
  79      */
  80     public Scope(final PropertyMap map, final long[] primitiveSpill, final Object[] objectSpill) {
  81         super(map, primitiveSpill, objectSpill);
  82         if (Context.DEBUG) {
  83             count++;
  84         }
  85     }
  86 
  87     @Override
  88     public boolean isScope() {
  89         return true;
  90     }
  91 
  92     @Override
  93     boolean hasWithScope() {
  94         for (ScriptObject obj = this; obj != null; obj = obj.getProto()) {
  95             if (obj instanceof WithObject) {
  96                 return true;
  97             }
  98         }
  99         return false;
 100     }
 101 
 102     /**
 103      * Get the scope's split method state.
 104      *
 105      * @return current split state
 106      */
 107     public int getSplitState() {
 108         return splitState;
 109     }
 110 
 111     /**
 112      * Set the scope's split method state.
 113      *
 114      * @param state current split state
 115      */
 116     public void setSplitState(final int state) {
 117         splitState = state;
 118     }
 119 
 120     /**
 121      * Get number of {@code Scope} instances created. If not running in debug
 122      * mode this is always 0.
 123      *
 124      * @return number of scope ScriptObjects created
 125      */
 126     public static int getScopeCount() {
 127         return count;
 128     }
 129 }
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