Mercurial > jdk8-mips64-public > nashorn / file revision

 /*

  * Copyright (c) 2010-2013, Oracle and/or its affiliates. All rights reserved.

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

  *

  * This code is free software; you can redistribute it and/or modify it

  * under the terms of the GNU General Public License version 2 only, as

  * published by the Free Software Foundation.  Oracle designates this

  * particular file as subject to the "Classpath" exception as provided

  * by Oracle in the LICENSE file that accompanied this code.

  *

  * This code is distributed in the hope that it will be useful, but WITHOUT

  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

  * version 2 for more details (a copy is included in the LICENSE file that

  * accompanied this code).

  *

  * You should have received a copy of the GNU General Public License version

  * 2 along with this work; if not, write to the Free Software Foundation,

  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

  *

  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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 package jdk.nashorn.internal.codegen;

 import static jdk.nashorn.internal.codegen.CompilerConstants.constructorNoLookup;

 import static jdk.nashorn.internal.codegen.types.Type.OBJECT;

 import java.util.List;

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

 import jdk.nashorn.internal.ir.Expression;

 import jdk.nashorn.internal.ir.LiteralNode;

 import jdk.nashorn.internal.ir.Symbol;

 import jdk.nashorn.internal.runtime.Property;

 import jdk.nashorn.internal.runtime.PropertyMap;

 import jdk.nashorn.internal.runtime.ScriptObject;

 import jdk.nashorn.internal.scripts.JO;

 /**

  * An object creator that uses spill properties.

  */

 public class SpillObjectCreator extends ObjectCreator {

     private final List<Expression> values;

     /**

      * Constructor

      *

      * @param codegen  code generator

      * @param keys     keys for fields in object

      * @param symbols  symbols for fields in object

      * @param values   list of values corresponding to keys

      */

     protected SpillObjectCreator(final CodeGenerator codegen, final List<String> keys, final List<Symbol> symbols, final List<Expression> values) {

         super(codegen, keys, symbols, false, false);

         this.values = values;

         makeMap();

     }

     @Override

     protected void makeObject(final MethodEmitter method) {

         assert !isScope() : "spill scope objects are not currently supported";

         final int      length       = keys.size();

         final Object[] presetValues = new Object[propertyMap.size()];

         final Class    clazz        = JO.class;

         // Compute constant values

         for (int i = 0; i < length; i++) {

             final String key = keys.get(i);

             final Property property = propertyMap.findProperty(key);

             if (property != null) {

                 presetValues[property.getSlot()] = LiteralNode.objectAsConstant(values.get(i));

             }

         }

         method._new(clazz).dup();

         codegen.loadConstant(propertyMap);

         method.invoke(constructorNoLookup(JO.class, PropertyMap.class));

         method.dup();

         codegen.loadConstant(presetValues);

         // Create properties with non-constant values

         for (int i = 0; i < length; i++) {

             final String key = keys.get(i);

             final Property property = propertyMap.findProperty(key);

             if (property != null && presetValues[property.getSlot()] == LiteralNode.POSTSET_MARKER) {

                 method.dup();

                 method.load(property.getSlot());

                 codegen.load(values.get(i)).convert(OBJECT);

                 method.arraystore();

                 presetValues[property.getSlot()] = null;

             }

         }

         method.putField(Type.typeFor(ScriptObject.class).getInternalName(), "spill", Type.OBJECT_ARRAY.getDescriptor());

         final int callSiteFlags = codegen.getCallSiteFlags();

         // Assign properties with valid array index keys

         for (int i = 0; i < length; i++) {

             final String key = keys.get(i);

             final Property property = propertyMap.findProperty(key);

             final Expression value = values.get(i);

             if (property == null && value != null) {

                 method.dup();

                 method.load(keys.get(i));

                 codegen.load(value);

                 method.dynamicSetIndex(callSiteFlags);

             }

         }

     }

     @Override

     protected PropertyMap makeMap() {

         assert propertyMap == null : "property map already initialized";

         propertyMap = new MapCreator(JO.class, keys, symbols) {

             @Override

             protected int getPropertyFlags(Symbol symbol, boolean hasArguments) {

                 return super.getPropertyFlags(symbol, hasArguments) | Property.IS_SPILL | Property.IS_ALWAYS_OBJECT;

             }

         }.makeSpillMap(false);

         return propertyMap;

     }

 }