| /* |
| * 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.linker; |
| |
| import static jdk.nashorn.internal.lookup.Lookup.MH; |
| |
| import java.lang.invoke.MethodHandle; |
| import java.lang.invoke.MethodType; |
| import jdk.internal.dynalink.CallSiteDescriptor; |
| import jdk.internal.dynalink.linker.GuardedInvocation; |
| import jdk.internal.dynalink.linker.LinkRequest; |
| import jdk.internal.dynalink.support.CallSiteDescriptorFactory; |
| import jdk.internal.dynalink.support.Guards; |
| import jdk.nashorn.internal.lookup.Lookup; |
| import jdk.nashorn.internal.runtime.FindProperty; |
| import jdk.nashorn.internal.runtime.ScriptObject; |
| |
| /** |
| * Implements lookup of methods to link for dynamic operations on JavaScript primitive values (booleans, strings, and |
| * numbers). This class is only public so it can be accessed by classes in the {@code jdk.nashorn.internal.objects} |
| * package. |
| */ |
| public final class PrimitiveLookup { |
| |
| private PrimitiveLookup() { |
| } |
| |
| /** |
| * Returns a guarded invocation representing the linkage for a dynamic operation on a primitive Java value. |
| * @param request the link request for the dynamic call site. |
| * @param receiverClass the class of the receiver value (e.g., {@link java.lang.Boolean}, {@link java.lang.String} etc.) |
| * @param wrappedReceiver a transient JavaScript native wrapper object created as the object proxy for the primitive |
| * value; see ECMAScript 5.1, section 8.7.1 for discussion of using {@code [[Get]]} on a property reference with a |
| * primitive base value. This instance will be used to delegate actual lookup. |
| * @param wrapFilter A method handle that takes a primitive value of type specified in the {@code receiverClass} and |
| * creates a transient native wrapper of the same type as {@code wrappedReceiver} for subsequent invocations of the |
| * method - it will be combined into the returned invocation as an argument filter on the receiver. |
| * @return a guarded invocation representing the operation at the call site when performed on a JavaScript primitive |
| * @param protoFilter A method handle that walks up the proto chain of this receiver object |
| * type {@code receiverClass}. |
| */ |
| public static GuardedInvocation lookupPrimitive(final LinkRequest request, final Class<?> receiverClass, |
| final ScriptObject wrappedReceiver, final MethodHandle wrapFilter, |
| final MethodHandle protoFilter) { |
| return lookupPrimitive(request, Guards.getInstanceOfGuard(receiverClass), wrappedReceiver, wrapFilter, protoFilter); |
| } |
| |
| /** |
| * Returns a guarded invocation representing the linkage for a dynamic operation on a primitive Java value. |
| * @param request the link request for the dynamic call site. |
| * @param guard an explicit guard that will be used for the returned guarded invocation. |
| * @param wrappedReceiver a transient JavaScript native wrapper object created as the object proxy for the primitive |
| * value; see ECMAScript 5.1, section 8.7.1 for discussion of using {@code [[Get]]} on a property reference with a |
| * primitive base value. This instance will be used to delegate actual lookup. |
| * @param wrapFilter A method handle that takes a primitive value of type guarded by the {@code guard} and |
| * creates a transient native wrapper of the same type as {@code wrappedReceiver} for subsequent invocations of the |
| * method - it will be combined into the returned invocation as an argument filter on the receiver. |
| * @param protoFilter A method handle that walks up the proto chain of this receiver object |
| * @return a guarded invocation representing the operation at the call site when performed on a JavaScript primitive |
| * type (that is implied by both {@code guard} and {@code wrappedReceiver}). |
| */ |
| public static GuardedInvocation lookupPrimitive(final LinkRequest request, final MethodHandle guard, |
| final ScriptObject wrappedReceiver, final MethodHandle wrapFilter, |
| final MethodHandle protoFilter) { |
| final CallSiteDescriptor desc = request.getCallSiteDescriptor(); |
| final String operator = CallSiteDescriptorFactory.tokenizeOperators(desc).get(0); |
| if ("setProp".equals(operator) || "setElem".equals(operator)) { |
| final MethodType type = desc.getMethodType(); |
| MethodHandle method = MH.asType(Lookup.EMPTY_SETTER, MH.type(void.class, Object.class, type.parameterType(1))); |
| if (type.parameterCount() == 3) { |
| method = MH.dropArguments(method, 2, type.parameterType(2)); |
| } |
| return new GuardedInvocation(method, guard); |
| } |
| |
| if(desc.getNameTokenCount() > 2) { |
| final String name = desc.getNameToken(CallSiteDescriptor.NAME_OPERAND); |
| final FindProperty find = wrappedReceiver.findProperty(name, true); |
| if(find == null) { |
| // Give up early, give chance to BeanLinker and NashornBottomLinker to deal with it. |
| return null; |
| } else if (find.isInherited() && !find.getProperty().hasGetterFunction(find.getOwner())) { |
| // If property is found in the prototype object bind the method handle directly to |
| // the proto filter instead of going through wrapper instantiation below. |
| final ScriptObject proto = wrappedReceiver.getProto(); |
| final GuardedInvocation link = proto.lookup(desc, request); |
| |
| if (link != null) { |
| final MethodHandle invocation = link.getInvocation(); |
| final MethodHandle adaptedInvocation = MH.asType(invocation, invocation.type().changeParameterType(0, Object.class)); |
| final MethodHandle method = MH.filterArguments(adaptedInvocation, 0, protoFilter); |
| final MethodHandle protoGuard = MH.filterArguments(link.getGuard(), 0, protoFilter); |
| return new GuardedInvocation(method, NashornGuards.combineGuards(guard, protoGuard)); |
| } |
| } |
| } |
| final GuardedInvocation link = wrappedReceiver.lookup(desc, request); |
| if (link != null) { |
| MethodHandle method = link.getInvocation(); |
| final Class<?> receiverType = method.type().parameterType(0); |
| if (receiverType != Object.class) { |
| final MethodType wrapType = wrapFilter.type(); |
| assert receiverType.isAssignableFrom(wrapType.returnType()); |
| method = MH.filterArguments(method, 0, MH.asType(wrapFilter, wrapType.changeReturnType(receiverType))); |
| } |
| return new GuardedInvocation(method, guard, link.getSwitchPoints(), null); |
| } |
| return null; |
| } |
| } |
