jdk8-mips64-public/nashorn: src/jdk/nashorn/internal/runtime/SetMethodCreator.java@e62dba3ce52b (annotated)

src/jdk/nashorn/internal/runtime/SetMethodCreator.java@e62dba3ce52b (annotated)

src/jdk/nashorn/internal/runtime/SetMethodCreator.java

Tue, 22 Jan 2013 22:07:12 +0530

author: sundar
date: Tue, 22 Jan 2013 22:07:12 +0530
changeset 44: e62dba3ce52b
parent 42: 935dcec38e9a
child 63: 697f700d90c0
permissions: -rw-r--r--

8006678: Avoid too many Context.getGlobal() calls
Reviewed-by: lagergren, jlaskey

 /*
  * 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
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  */
 package jdk.nashorn.internal.runtime;
 import static jdk.nashorn.internal.runtime.ECMAErrors.referenceError;
 import static jdk.nashorn.internal.runtime.linker.Lookup.MH;
 import java.lang.invoke.MethodHandle;
 import jdk.nashorn.internal.codegen.objects.ObjectClassGenerator;
 import jdk.nashorn.internal.runtime.linker.Lookup;
 import jdk.nashorn.internal.runtime.linker.NashornCallSiteDescriptor;
 import jdk.nashorn.internal.runtime.linker.NashornGuardedInvocation;
 import jdk.nashorn.internal.runtime.linker.NashornGuards;
 import org.dynalang.dynalink.CallSiteDescriptor;
 import org.dynalang.dynalink.linker.GuardedInvocation;
 /**
  * Instances of this class are quite ephemeral; they only exist for the duration of an invocation of
  * {@link ScriptObject#findSetMethod(CallSiteDescriptor, boolean)} and serve as the actual encapsulation of the
  * algorithm for creating an appropriate property setter method.
  */
 class SetMethodCreator {
     // See constructor parameters for description of fields
     private final ScriptObject sobj;
     private final PropertyMap map;
     private final FindProperty find;
     private final CallSiteDescriptor desc;
     /**
      * Creates a new property setter method creator.
      * @param sobj the object for which we're creating the property setter
      * @param find a result of a {@link ScriptObject#findProperty(String, boolean)} on the object for the property we
      * want to create a setter for. Can be null if the property does not yet exist on the object.
      * @param desc the descriptor of the call site that triggered the property setter lookup
      */
     SetMethodCreator(final ScriptObject sobj, final FindProperty find, final CallSiteDescriptor desc) {
         this.sobj = sobj;
         this.map = sobj.getMap();
         this.find = find;
         this.desc = desc;
     }
     private String getName() {
         return desc.getNameToken(CallSiteDescriptor.NAME_OPERAND);
     }
     private PropertyMap getMap() {
         return map;
     }
     /**
      * Creates the actual guarded invocation that represents the dynamic setter method for the property.
      * @return the actual guarded invocation that represents the dynamic setter method for the property.
      */
     GuardedInvocation createGuardedInvocation() {
         return createSetMethod().createGuardedInvocation();
     }
     /**
      * This class encapsulates the results of looking up a setter method; it's basically a triple of a method hanle,
      * a Property object, and flags for invocation.
      *
      */
     private class SetMethod {
         private final MethodHandle methodHandle;
         private final Property property;
         private final boolean nonStrict;
         /**
          * Creates a new lookup result.
          * @param methodHandle the actual method handle
          * @param property the property object. Can be null in case we're creating a new property in the global object.
          * @param nonStrict True if an existing property with a non-strict function as property setter is discovered.
          */
         SetMethod(final MethodHandle methodHandle, final Property property, final boolean nonStrict) {
             assert methodHandle != null;
             this.methodHandle = methodHandle;
             this.property = property;
             this.nonStrict = nonStrict;
         }
         /**
          * Composes from its components an actual guarded invocation that represents the dynamic setter method for the property.
          * @return the composed guarded invocation that represents the dynamic setter method for the property.
          */
         GuardedInvocation createGuardedInvocation() {
             return new NashornGuardedInvocation(methodHandle, null, getGuard(), nonStrict);
         }
         private MethodHandle getGuard() {
             return needsNoGuard() ? null : NashornGuards.getMapGuard(getMap());
         }
         private boolean needsNoGuard() {
             return NashornCallSiteDescriptor.isFastScope(desc) &&
                     (ObjectClassGenerator.OBJECT_FIELDS_ONLY || isPropertyTypeStable());
         }
         private boolean isPropertyTypeStable() {
             return property == null || !property.canChangeType();
         }
     }
     private SetMethod createSetMethod() {
         if (find != null) {
             return createExistingPropertySetter();
         }
         checkStrictCreateNewVariable();
         if (sobj.isScope()) {
             return createGlobalPropertySetter();
         }
         return createNewPropertySetter();
     }
     private void checkStrictCreateNewVariable() {
         // In strict mode, assignment can not create a new variable.
         // See also ECMA Annex C item 4. ReferenceError is thrown.
         if (NashornCallSiteDescriptor.isScope(desc) && NashornCallSiteDescriptor.isStrict(desc)) {
             referenceError("not.defined", getName());
         }
     }
     private SetMethod createExistingPropertySetter() {
         final Property property = find.getProperty();
         final Class<?> type = desc.getMethodType().parameterType(1);
         final MethodHandle methodHandle = find.getSetter(type, NashornCallSiteDescriptor.isStrict(desc));
         assert methodHandle != null;
         assert property     != null;
         final MethodHandle boundHandle;
         if (!property.hasSetterFunction() && find.isInherited()) {
             boundHandle = ScriptObject.bindTo(methodHandle, find.getOwner());
         } else {
             boundHandle = methodHandle;
         }
         return new SetMethod(boundHandle, property, getExistingSetterNonStrictFlag());
     }
     private boolean getExistingSetterNonStrictFlag() {
         final ScriptFunction setter = find.getSetterFunction();
         return setter != null && setter.isNonStrictFunction();
     }
     private SetMethod createGlobalPropertySetter() {
         final ScriptObject global = Context.getGlobalTrusted();
         return new SetMethod(ScriptObject.bindTo(global.addSpill(getName()), global), null, false);
     }
     private SetMethod createNewPropertySetter() {
         final int nextEmbed = sobj.findEmbed();
         final SetMethod sm;
         if (nextEmbed >= ScriptObject.EMBED_SIZE) {
             sm = createNewSpillPropertySetter();
         } else {
             sm = createNewEmbedPropertySetter(nextEmbed);
         }
         sobj.notifyPropertyAdded(sobj, sm.property);
         return sm;
     }
     private SetMethod createNewSpillPropertySetter() {
         final int nextSpill = getMap().getSpillLength();
         final Property property = createSpillProperty(nextSpill);
         return new SetMethod(createSpillMethodHandle(nextSpill, property), property, false);
     }
     private Property createSpillProperty(final int nextSpill) {
         final MethodHandle getter = MH.asType(MH.insertArguments(MH.arrayElementGetter(Object[].class), 1, nextSpill), Lookup.GET_OBJECT_TYPE);
         final MethodHandle setter = MH.asType(MH.insertArguments(MH.arrayElementSetter(Object[].class), 1, nextSpill), Lookup.SET_OBJECT_TYPE);
         return new SpillProperty(getName(), Property.IS_SPILL, nextSpill, getter, setter);
     }
     private MethodHandle createSpillMethodHandle(final int nextSpill, Property property) {
         final PropertyMap oldMap = getMap();
         final PropertyMap newMap = getNewMap(property);
         final Object[] spill = sobj.spill;
         if (spill == null) {
             return MH.insertArguments(ScriptObject.SETSPILLWITHNEW,  0, desc, oldMap, newMap, nextSpill);
         } else if (nextSpill < spill.length) {
             return MH.insertArguments(ScriptObject.SETSPILL,         0, desc, oldMap, newMap, nextSpill);
         } else {
             final int newLength = (nextSpill + ScriptObject.SPILL_RATE) / ScriptObject.SPILL_RATE * ScriptObject.SPILL_RATE;
             return MH.insertArguments(ScriptObject.SETSPILLWITHGROW, 0, desc, oldMap, newMap, nextSpill, newLength);
         }
     }
     private SetMethod createNewEmbedPropertySetter(final int nextEmbed) {
         sobj.useEmbed(nextEmbed);
         final Property property = new SpillProperty(getName(), 0, nextEmbed, ScriptObject.GET_EMBED[nextEmbed], ScriptObject.SET_EMBED[nextEmbed]);
         //TODO specfields
         final MethodHandle methodHandle = MH.insertArguments(ScriptObject.SETEMBED, 0, desc, getMap(), getNewMap(property), property.getSetter(Object.class, getMap()), nextEmbed);
         return new SetMethod(methodHandle, property, false);
     }
     private PropertyMap getNewMap(Property property) {
         return getMap().addProperty(property);
     }
 }

Mercurial > jdk8-mips64-public > nashorn / annotate

src/jdk/nashorn/internal/runtime/SetMethodCreator.java@e62dba3ce52b (annotated)

src/jdk/nashorn/internal/runtime/SetMethodCreator.java