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Java example source code file (SetMethodCreator.java)
The SetMethodCreator.java Java example source code/* * 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.lookup.Lookup.MH; import java.lang.invoke.MethodHandle; import jdk.internal.dynalink.CallSiteDescriptor; import jdk.internal.dynalink.linker.GuardedInvocation; import jdk.nashorn.internal.codegen.ObjectClassGenerator; import jdk.nashorn.internal.lookup.Lookup; import jdk.nashorn.internal.runtime.linker.NashornCallSiteDescriptor; import jdk.nashorn.internal.runtime.linker.NashornGuards; /** * Instances of this class are quite ephemeral; they only exist for the duration of an invocation of * {@link ScriptObject#findSetMethod(CallSiteDescriptor, jdk.internal.dynalink.linker.LinkRequest)} and * serve as the actual encapsulation of the algorithm for creating an appropriate property setter method. */ final 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; /** * 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. */ SetMethod(final MethodHandle methodHandle, final Property property) { assert methodHandle != null; this.methodHandle = methodHandle; this.property = property; } /** * 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 GuardedInvocation(methodHandle, getGuard()); } 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)) { throw 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 ScriptObject prototype = find.getOwner(); final MethodHandle boundHandle; if (!property.hasSetterFunction(prototype) && find.isInherited()) { boundHandle = ScriptObject.bindTo(methodHandle, prototype); } else { boundHandle = methodHandle; } return new SetMethod(boundHandle, property); } private SetMethod createGlobalPropertySetter() { final ScriptObject global = Context.getGlobalTrusted(); return new SetMethod(ScriptObject.bindTo(global.addSpill(getName()), global), null); } private SetMethod createNewPropertySetter() { final SetMethod sm = map.getFieldCount() < map.getFieldMaximum() ? createNewFieldSetter() : createNewSpillPropertySetter(); sobj.notifyPropertyAdded(sobj, sm.property); return sm; } private SetMethod createNewFieldSetter() { final PropertyMap oldMap = getMap(); final Property property = new AccessorProperty(getName(), 0, sobj.getClass(), oldMap.getFieldCount()); final PropertyMap newMap = oldMap.addProperty(property); MethodHandle setter = MH.insertArguments(ScriptObject.SETFIELD, 0, desc, oldMap, newMap, property.getSetter(Object.class, newMap)); return new SetMethod(MH.asType(setter, Lookup.SET_OBJECT_TYPE), property); } private SetMethod createNewSpillPropertySetter() { final int nextSpill = getMap().getSpillLength(); final Property property = new AccessorProperty(getName(), Property.IS_SPILL, nextSpill); return new SetMethod(createSpillMethodHandle(nextSpill, property), property); } 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 PropertyMap getNewMap(Property property) { return getMap().addProperty(property); } } Other Java examples (source code examples)Here is a short list of links related to this Java SetMethodCreator.java source code file: |
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