nashorn/src/jdk/nashorn/internal/runtime/FindProperty.java - edge/openjdk - Git at Google

 /*
  * 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.lookup.Lookup.MH;
 import static jdk.nashorn.internal.runtime.UnwarrantedOptimismException.isValid;

 import java.lang.invoke.MethodHandle;
 import jdk.internal.dynalink.linker.LinkRequest;
 import jdk.nashorn.internal.codegen.ObjectClassGenerator;
 import jdk.nashorn.internal.objects.Global;

 /**
  * This class represents the result from a find property search.
  */
 public final class FindProperty {
     /** Object where search began. */
     private final ScriptObject self;

     /** Object where search finish. */
     private final ScriptObject prototype;

     /** Found property. */
     private final Property     property;

     /**
      * Constructor
      *
      * @param self      script object where search began
      * @param prototype prototype where property was found, may be {@code self} if not inherited
      * @param property  property that was search result
      */
     public FindProperty(final ScriptObject self, final ScriptObject prototype, final Property property) {
         this.self      = self;
         this.prototype = prototype;
         this.property  = property;
     }

     /**
      * Return a copy of this FindProperty with a different property.
      *
      * @param newProperty the new property
      * @return the new FindProperty instance
      */
     public FindProperty replaceProperty(final Property newProperty) {
         assert this.property.getKey().equals(newProperty.getKey());
         assert this.property.getSlot() == newProperty.getSlot();
         return new FindProperty(self, prototype, newProperty);
     }

     /**
      * Ask for a getter that returns the given type. The type has nothing to do with the
      * internal representation of the property. It may be an Object (boxing primitives) or
      * a primitive (primitive fields with -Dnashorn.fields.dual=true)
      * @see ObjectClassGenerator
      *
      * @param type type of getter, e.g. int.class if we want a function with {@code get()I} signature
      * @param programPoint program point, or INVALID_PROGRAM_POINT if pessimistic
      * @param request link request
      *
      * @return method handle for the getter
      */
     public MethodHandle getGetter(final Class<?> type, final int programPoint, final LinkRequest request) {
         MethodHandle getter;
         if (isValid(programPoint)) {
             getter = property.getOptimisticGetter(type, programPoint);
         } else {
             getter = property.getGetter(type);
         }
         if (property instanceof UserAccessorProperty) {
             getter = MH.insertArguments(getter, 1, UserAccessorProperty.getINVOKE_UA_GETTER(type, programPoint));
             if (isValid(programPoint) && type.isPrimitive()) {
                 getter = MH.insertArguments(getter, 1, programPoint);
             }
             property.setType(type);
             return insertAccessorsGetter((UserAccessorProperty) property, request, getter);
         }
         return getter;
     }

     /**
      * Ask for a setter that sets the given type. The type has nothing to do with the
      * internal representation of the property. It may be an Object (boxing primitives) or
      * a primitive (primitive fields with -Dnashorn.fields.dual=true)
      * @see ObjectClassGenerator
      *
      * @param type type of setter, e.g. int.class if we want a function with {@code set(I)V} signature
      * @param strict are we in strict mode
      * @param request link request
      *
      * @return method handle for the getter
      */
     public MethodHandle getSetter(final Class<?> type, final boolean strict, final LinkRequest request) {
         MethodHandle setter = property.getSetter(type, getOwner().getMap());
         if (property instanceof UserAccessorProperty) {
             setter =  MH.insertArguments(setter, 1, UserAccessorProperty.getINVOKE_UA_SETTER(type), strict ? property.getKey() : null);
             property.setType(type);
             return insertAccessorsGetter((UserAccessorProperty) property, request, setter);
         }

         return setter;
     }

     // Fold an accessor getter into the method handle of a user accessor property.
     private MethodHandle insertAccessorsGetter(final UserAccessorProperty uap, final LinkRequest request, final MethodHandle mh) {
         MethodHandle superGetter = uap.getAccessorsGetter();
         if (isInherited()) {
             superGetter = ScriptObject.addProtoFilter(superGetter, getProtoChainLength());
         }
         if (request != null && !(request.getReceiver() instanceof ScriptObject)) {
             final MethodHandle wrapFilter = Global.getPrimitiveWrapFilter(request.getReceiver());
             superGetter = MH.filterArguments(superGetter, 0, wrapFilter.asType(wrapFilter.type().changeReturnType(superGetter.type().parameterType(0))));
         }
         superGetter = MH.asType(superGetter, superGetter.type().changeParameterType(0, Object.class));

         return MH.foldArguments(mh, superGetter);
     }

     /**
      * Return the {@code ScriptObject} owning of the property:  this means the prototype.
      * @return owner of property
      */
     public ScriptObject getOwner() {
         return prototype;
     }

     /**
      * Return the {@code ScriptObject} where the search started. This is usually the ScriptObject the
      * operation was started on, except for properties found inside a 'with' statement, where it is the
      * top-level 'with' expression object.
      *
      * @return the start object.
      */
     public ScriptObject getSelf() {
         return self;
     }

     /**
      * Return the appropriate receiver for a getter.
      * @return appropriate receiver
      */
     public ScriptObject getGetterReceiver() {
         return property != null && property instanceof UserAccessorProperty ? self : prototype;
     }

     /**
      * Return the appropriate receiver for a setter.
      * @return appropriate receiver
      */
     public ScriptObject getSetterReceiver() {
         return property != null && property.hasSetterFunction(prototype) ? self : prototype;
     }

     /**
      * Return the property that was found
      * @return property
      */
     public Property getProperty() {
         return property;
     }

     /**
      * Check if the property found was inherited, i.e. not directly in the self
      * @return true if inherited property
      */
     public boolean isInherited() {
         return self != prototype;
     }

     /**
      * Check if the property found was NOT inherited, i.e. defined in the script
      * object, rather than in the prototype
      * @return true if not inherited
      */
     public boolean isSelf() {
         return self == prototype;
     }

     /**
      * Check if the property is in the scope
      * @return true if on scope
      */
     public boolean isScope() {
         return prototype.isScope();
     }

     /**
      * Get the property value from self as object.
      * @return the property value
      */
     public int getIntValue() {
         return property.getIntValue(getGetterReceiver(), getOwner());
     }
     /**
      * Get the property value from self as object.
      * @return the property value
      */
     public double getDoubleValue() {
         return property.getDoubleValue(getGetterReceiver(), getOwner());
     }
     /**
      * Get the property value from self as object.
      * @return the property value
      */
     public Object getObjectValue() {
         return property.getObjectValue(getGetterReceiver(), getOwner());
     }

     /**
      * Set the property value in self.
      *
      * @param value the new value
      * @param strict strict flag
      */
     public void setValue(final int value, final boolean strict) {
         property.setValue(getSetterReceiver(), getOwner(), value, strict);
     }

     /**
      * Set the property value in self.
      *
      * @param value the new value
      * @param strict strict flag
      */
     public void setValue(final double value, final boolean strict) {
         property.setValue(getSetterReceiver(), getOwner(), value, strict);
     }

     /**
      * Set the property value in self.
      *
      * @param value the new value
      * @param strict strict flag
      */
     public void setValue(final Object value, final boolean strict) {
         property.setValue(getSetterReceiver(), getOwner(), value, strict);
     }

     /**
      * Get the number of objects in the prototype chain between the {@code self} and the
      * {@code owner} objects.
      * @return the prototype chain length
      */
     int getProtoChainLength() {
         assert self != null;
         int length = 0;
         for (ScriptObject obj = self; obj != prototype; obj = obj.getProto()) {
             assert !(obj instanceof WithObject);
             ++length;
         }
         return length;
     }

     @Override
     public String toString() {
         return "[FindProperty: " + property.getKey() + ']';
     }

 }
	/*
	* 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.lookup.Lookup.MH;
	import static jdk.nashorn.internal.runtime.UnwarrantedOptimismException.isValid;

	import java.lang.invoke.MethodHandle;
	import jdk.internal.dynalink.linker.LinkRequest;
	import jdk.nashorn.internal.codegen.ObjectClassGenerator;
	import jdk.nashorn.internal.objects.Global;

	/**
	* This class represents the result from a find property search.
	*/
	public final class FindProperty {
	/** Object where search began. */
	private final ScriptObject self;

	/** Object where search finish. */
	private final ScriptObject prototype;

	/** Found property. */
	private final Property property;

	/**
	* Constructor
	*
	* @param self script object where search began
	* @param prototype prototype where property was found, may be {@code self} if not inherited
	* @param property property that was search result
	*/
	public FindProperty(final ScriptObject self, final ScriptObject prototype, final Property property) {
	this.self = self;
	this.prototype = prototype;
	this.property = property;
	}

	/**
	* Return a copy of this FindProperty with a different property.
	*
	* @param newProperty the new property
	* @return the new FindProperty instance
	*/
	public FindProperty replaceProperty(final Property newProperty) {
	assert this.property.getKey().equals(newProperty.getKey());
	assert this.property.getSlot() == newProperty.getSlot();
	return new FindProperty(self, prototype, newProperty);
	}

	/**
	* Ask for a getter that returns the given type. The type has nothing to do with the
	* internal representation of the property. It may be an Object (boxing primitives) or
	* a primitive (primitive fields with -Dnashorn.fields.dual=true)
	* @see ObjectClassGenerator
	*
	* @param type type of getter, e.g. int.class if we want a function with {@code get()I} signature
	* @param programPoint program point, or INVALID_PROGRAM_POINT if pessimistic
	* @param request link request
	*
	* @return method handle for the getter
	*/
	public MethodHandle getGetter(final Class<?> type, final int programPoint, final LinkRequest request) {
	MethodHandle getter;
	if (isValid(programPoint)) {
	getter = property.getOptimisticGetter(type, programPoint);
	} else {
	getter = property.getGetter(type);
	}
	if (property instanceof UserAccessorProperty) {
	getter = MH.insertArguments(getter, 1, UserAccessorProperty.getINVOKE_UA_GETTER(type, programPoint));
	if (isValid(programPoint) && type.isPrimitive()) {
	getter = MH.insertArguments(getter, 1, programPoint);
	}
	property.setType(type);
	return insertAccessorsGetter((UserAccessorProperty) property, request, getter);
	}
	return getter;
	}

	/**
	* Ask for a setter that sets the given type. The type has nothing to do with the
	* internal representation of the property. It may be an Object (boxing primitives) or
	* a primitive (primitive fields with -Dnashorn.fields.dual=true)
	* @see ObjectClassGenerator
	*
	* @param type type of setter, e.g. int.class if we want a function with {@code set(I)V} signature
	* @param strict are we in strict mode
	* @param request link request
	*
	* @return method handle for the getter
	*/
	public MethodHandle getSetter(final Class<?> type, final boolean strict, final LinkRequest request) {
	MethodHandle setter = property.getSetter(type, getOwner().getMap());
	if (property instanceof UserAccessorProperty) {
	setter = MH.insertArguments(setter, 1, UserAccessorProperty.getINVOKE_UA_SETTER(type), strict ? property.getKey() : null);
	property.setType(type);
	return insertAccessorsGetter((UserAccessorProperty) property, request, setter);
	}

	return setter;
	}

	// Fold an accessor getter into the method handle of a user accessor property.
	private MethodHandle insertAccessorsGetter(final UserAccessorProperty uap, final LinkRequest request, final MethodHandle mh) {
	MethodHandle superGetter = uap.getAccessorsGetter();
	if (isInherited()) {
	superGetter = ScriptObject.addProtoFilter(superGetter, getProtoChainLength());
	}
	if (request != null && !(request.getReceiver() instanceof ScriptObject)) {
	final MethodHandle wrapFilter = Global.getPrimitiveWrapFilter(request.getReceiver());
	superGetter = MH.filterArguments(superGetter, 0, wrapFilter.asType(wrapFilter.type().changeReturnType(superGetter.type().parameterType(0))));
	}
	superGetter = MH.asType(superGetter, superGetter.type().changeParameterType(0, Object.class));

	return MH.foldArguments(mh, superGetter);
	}

	/**
	* Return the {@code ScriptObject} owning of the property: this means the prototype.
	* @return owner of property
	*/
	public ScriptObject getOwner() {
	return prototype;
	}

	/**
	* Return the {@code ScriptObject} where the search started. This is usually the ScriptObject the
	* operation was started on, except for properties found inside a 'with' statement, where it is the
	* top-level 'with' expression object.
	*
	* @return the start object.
	*/
	public ScriptObject getSelf() {
	return self;
	}

	/**
	* Return the appropriate receiver for a getter.
	* @return appropriate receiver
	*/
	public ScriptObject getGetterReceiver() {
	return property != null && property instanceof UserAccessorProperty ? self : prototype;
	}

	/**
	* Return the appropriate receiver for a setter.
	* @return appropriate receiver
	*/
	public ScriptObject getSetterReceiver() {
	return property != null && property.hasSetterFunction(prototype) ? self : prototype;
	}

	/**
	* Return the property that was found
	* @return property
	*/
	public Property getProperty() {
	return property;
	}

	/**
	* Check if the property found was inherited, i.e. not directly in the self
	* @return true if inherited property
	*/
	public boolean isInherited() {
	return self != prototype;
	}

	/**
	* Check if the property found was NOT inherited, i.e. defined in the script
	* object, rather than in the prototype
	* @return true if not inherited
	*/
	public boolean isSelf() {
	return self == prototype;
	}

	/**
	* Check if the property is in the scope
	* @return true if on scope
	*/
	public boolean isScope() {
	return prototype.isScope();
	}

	/**
	* Get the property value from self as object.
	* @return the property value
	*/
	public int getIntValue() {
	return property.getIntValue(getGetterReceiver(), getOwner());
	}
	/**
	* Get the property value from self as object.
	* @return the property value
	*/
	public double getDoubleValue() {
	return property.getDoubleValue(getGetterReceiver(), getOwner());
	}
	/**
	* Get the property value from self as object.
	* @return the property value
	*/
	public Object getObjectValue() {
	return property.getObjectValue(getGetterReceiver(), getOwner());
	}

	/**
	* Set the property value in self.
	*
	* @param value the new value
	* @param strict strict flag
	*/
	public void setValue(final int value, final boolean strict) {
	property.setValue(getSetterReceiver(), getOwner(), value, strict);
	}

	/**
	* Set the property value in self.
	*
	* @param value the new value
	* @param strict strict flag
	*/
	public void setValue(final double value, final boolean strict) {
	property.setValue(getSetterReceiver(), getOwner(), value, strict);
	}

	/**
	* Set the property value in self.
	*
	* @param value the new value
	* @param strict strict flag
	*/
	public void setValue(final Object value, final boolean strict) {
	property.setValue(getSetterReceiver(), getOwner(), value, strict);
	}

	/**
	* Get the number of objects in the prototype chain between the {@code self} and the
	* {@code owner} objects.
	* @return the prototype chain length
	*/
	int getProtoChainLength() {
	assert self != null;
	int length = 0;
	for (ScriptObject obj = self; obj != prototype; obj = obj.getProto()) {
	assert !(obj instanceof WithObject);
	++length;
	}
	return length;
	}

	@Override
	public String toString() {
	return "[FindProperty: " + property.getKey() + ']';
	}

	}