author | attila |
Mon, 02 Mar 2015 14:33:55 +0100 | |
changeset 29282 | a8523237b66c |
parent 28125 | 118973efb1d3 |
child 32889 | aef39bbfac15 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package jdk.nashorn.internal.runtime.linker; |
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import static jdk.nashorn.internal.runtime.JSType.isString; |
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import static jdk.nashorn.internal.runtime.linker.BrowserJSObjectLinker.JSObjectHandles.JSOBJECT_CALL; |
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import static jdk.nashorn.internal.runtime.linker.BrowserJSObjectLinker.JSObjectHandles.JSOBJECT_GETMEMBER; |
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import static jdk.nashorn.internal.runtime.linker.BrowserJSObjectLinker.JSObjectHandles.JSOBJECT_GETSLOT; |
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import static jdk.nashorn.internal.runtime.linker.BrowserJSObjectLinker.JSObjectHandles.JSOBJECT_SETMEMBER; |
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import static jdk.nashorn.internal.runtime.linker.BrowserJSObjectLinker.JSObjectHandles.JSOBJECT_SETSLOT; |
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import java.lang.invoke.MethodHandle; |
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import java.lang.invoke.MethodHandles; |
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import jdk.internal.dynalink.CallSiteDescriptor; |
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import jdk.internal.dynalink.linker.GuardedInvocation; |
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import jdk.internal.dynalink.linker.LinkRequest; |
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import jdk.internal.dynalink.linker.LinkerServices; |
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import jdk.internal.dynalink.linker.TypeBasedGuardingDynamicLinker; |
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import jdk.internal.dynalink.support.CallSiteDescriptorFactory; |
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import jdk.nashorn.internal.lookup.MethodHandleFactory; |
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import jdk.nashorn.internal.lookup.MethodHandleFunctionality; |
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import jdk.nashorn.internal.runtime.JSType; |
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/** |
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* A Dynalink linker to handle web browser built-in JS (DOM etc.) objects. |
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*/ |
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final class BrowserJSObjectLinker implements TypeBasedGuardingDynamicLinker { |
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private static ClassLoader extLoader; |
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static { |
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extLoader = BrowserJSObjectLinker.class.getClassLoader(); |
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// in case nashorn is loaded as bootstrap! |
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if (extLoader == null) { |
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extLoader = ClassLoader.getSystemClassLoader().getParent(); |
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} |
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} |
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private static final String JSOBJECT_CLASS = "netscape.javascript.JSObject"; |
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// not final because this is lazily initialized |
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// when we hit a subclass for the first time. |
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private static volatile Class<?> jsObjectClass; |
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private final NashornBeansLinker nashornBeansLinker; |
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BrowserJSObjectLinker(final NashornBeansLinker nashornBeansLinker) { |
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this.nashornBeansLinker = nashornBeansLinker; |
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} |
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@Override |
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public boolean canLinkType(final Class<?> type) { |
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return canLinkTypeStatic(type); |
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} |
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static boolean canLinkTypeStatic(final Class<?> type) { |
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if (jsObjectClass != null && jsObjectClass.isAssignableFrom(type)) { |
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return true; |
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} |
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// check if this class is a subclass of JSObject |
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Class<?> clazz = type; |
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while (clazz != null) { |
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if (clazz.getClassLoader() == extLoader && |
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clazz.getName().equals(JSOBJECT_CLASS)) { |
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jsObjectClass = clazz; |
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return true; |
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} |
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clazz = clazz.getSuperclass(); |
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} |
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return false; |
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} |
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private static void checkJSObjectClass() { |
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assert jsObjectClass != null : JSOBJECT_CLASS + " not found!"; |
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} |
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@Override |
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public GuardedInvocation getGuardedInvocation(final LinkRequest request, final LinkerServices linkerServices) throws Exception { |
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final LinkRequest requestWithoutContext = request.withoutRuntimeContext(); // Nashorn has no runtime context |
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final Object self = requestWithoutContext.getReceiver(); |
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final CallSiteDescriptor desc = requestWithoutContext.getCallSiteDescriptor(); |
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checkJSObjectClass(); |
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if (desc.getNameTokenCount() < 2 || !"dyn".equals(desc.getNameToken(CallSiteDescriptor.SCHEME))) { |
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// We only support standard "dyn:*[:*]" operations |
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return null; |
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} |
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final GuardedInvocation inv; |
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if (jsObjectClass.isInstance(self)) { |
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inv = lookup(desc, request, linkerServices); |
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} else { |
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throw new AssertionError(); // Should never reach here. |
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} |
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return Bootstrap.asTypeSafeReturn(inv, linkerServices, desc); |
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} |
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private GuardedInvocation lookup(final CallSiteDescriptor desc, final LinkRequest request, final LinkerServices linkerServices) throws Exception { |
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final String operator = CallSiteDescriptorFactory.tokenizeOperators(desc).get(0); |
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final int c = desc.getNameTokenCount(); |
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GuardedInvocation inv; |
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try { |
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inv = nashornBeansLinker.getGuardedInvocation(request, linkerServices); |
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} catch (Throwable th) { |
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inv = null; |
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} |
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|
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switch (operator) { |
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case "getProp": |
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case "getElem": |
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case "getMethod": |
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return c > 2? findGetMethod(desc, inv) : findGetIndexMethod(inv); |
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case "setProp": |
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case "setElem": |
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return c > 2? findSetMethod(desc, inv) : findSetIndexMethod(); |
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case "call": |
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return findCallMethod(desc); |
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default: |
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return null; |
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} |
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} |
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|
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private static GuardedInvocation findGetMethod(final CallSiteDescriptor desc, final GuardedInvocation inv) { |
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if (inv != null) { |
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return inv; |
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} |
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final String name = desc.getNameToken(CallSiteDescriptor.NAME_OPERAND); |
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final MethodHandle getter = MH.insertArguments(JSOBJECT_GETMEMBER, 1, name); |
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return new GuardedInvocation(getter, IS_JSOBJECT_GUARD); |
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} |
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|
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private static GuardedInvocation findGetIndexMethod(final GuardedInvocation inv) { |
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final MethodHandle getter = MH.insertArguments(JSOBJECTLINKER_GET, 0, inv.getInvocation()); |
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return inv.replaceMethods(getter, inv.getGuard()); |
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} |
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|
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private static GuardedInvocation findSetMethod(final CallSiteDescriptor desc, final GuardedInvocation inv) { |
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if (inv != null) { |
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return inv; |
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} |
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final MethodHandle getter = MH.insertArguments(JSOBJECT_SETMEMBER, 1, desc.getNameToken(2)); |
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return new GuardedInvocation(getter, IS_JSOBJECT_GUARD); |
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} |
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|
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private static GuardedInvocation findSetIndexMethod() { |
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return new GuardedInvocation(JSOBJECTLINKER_PUT, IS_JSOBJECT_GUARD); |
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} |
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|
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private static GuardedInvocation findCallMethod(final CallSiteDescriptor desc) { |
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final MethodHandle call = MH.insertArguments(JSOBJECT_CALL, 1, "call"); |
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return new GuardedInvocation(MH.asCollector(call, Object[].class, desc.getMethodType().parameterCount() - 1), IS_JSOBJECT_GUARD); |
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} |
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|
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176 |
@SuppressWarnings("unused") |
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177 |
private static boolean isJSObject(final Object self) { |
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return jsObjectClass.isInstance(self); |
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179 |
} |
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180 |
|
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181 |
@SuppressWarnings("unused") |
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private static Object get(final MethodHandle fallback, final Object jsobj, final Object key) throws Throwable { |
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if (key instanceof Integer) { |
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184 |
return JSOBJECT_GETSLOT.invokeExact(jsobj, (int)key); |
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185 |
} else if (key instanceof Number) { |
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186 |
final int index = getIndex((Number)key); |
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187 |
if (index > -1) { |
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188 |
return JSOBJECT_GETSLOT.invokeExact(jsobj, index); |
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189 |
} |
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} else if (isString(key)) { |
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final String name = key.toString(); |
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if (name.indexOf('(') != -1) { |
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return fallback.invokeExact(jsobj, (Object) name); |
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} |
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return JSOBJECT_GETMEMBER.invokeExact(jsobj, name); |
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196 |
} |
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197 |
return null; |
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|
198 |
} |
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|
199 |
|
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200 |
@SuppressWarnings("unused") |
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201 |
private static void put(final Object jsobj, final Object key, final Object value) throws Throwable { |
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|
202 |
if (key instanceof Integer) { |
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203 |
JSOBJECT_SETSLOT.invokeExact(jsobj, (int)key, value); |
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204 |
} else if (key instanceof Number) { |
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205 |
JSOBJECT_SETSLOT.invokeExact(jsobj, getIndex((Number)key), value); |
29282 | 206 |
} else if (isString(key)) { |
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JSOBJECT_SETMEMBER.invokeExact(jsobj, key.toString(), value); |
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208 |
} |
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209 |
} |
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|
210 |
|
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211 |
private static int getIndex(final Number n) { |
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|
212 |
final double value = n.doubleValue(); |
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213 |
return JSType.isRepresentableAsInt(value) ? (int)value : -1; |
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|
214 |
} |
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|
215 |
|
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216 |
private static final MethodHandleFunctionality MH = MethodHandleFactory.getFunctionality(); |
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217 |
// method handles of the current class |
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218 |
private static final MethodHandle IS_JSOBJECT_GUARD = findOwnMH_S("isJSObject", boolean.class, Object.class); |
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219 |
private static final MethodHandle JSOBJECTLINKER_GET = findOwnMH_S("get", Object.class, MethodHandle.class, Object.class, Object.class); |
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private static final MethodHandle JSOBJECTLINKER_PUT = findOwnMH_S("put", Void.TYPE, Object.class, Object.class, Object.class); |
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|
221 |
|
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222 |
private static MethodHandle findOwnMH_S(final String name, final Class<?> rtype, final Class<?>... types) { |
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223 |
return MH.findStatic(MethodHandles.lookup(), BrowserJSObjectLinker.class, name, MH.type(rtype, types)); |
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|
224 |
} |
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|
225 |
|
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226 |
// method handles of netscape.javascript.JSObject class |
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227 |
// These are in separate class as we lazily initialize these |
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228 |
// method handles when we hit a subclass of JSObject first time. |
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|
229 |
static class JSObjectHandles { |
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230 |
// method handles of JSObject class |
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231 |
static final MethodHandle JSOBJECT_GETMEMBER = findJSObjectMH_V("getMember", Object.class, String.class).asType(MH.type(Object.class, Object.class, String.class)); |
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232 |
static final MethodHandle JSOBJECT_GETSLOT = findJSObjectMH_V("getSlot", Object.class, int.class).asType(MH.type(Object.class, Object.class, int.class)); |
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233 |
static final MethodHandle JSOBJECT_SETMEMBER = findJSObjectMH_V("setMember", Void.TYPE, String.class, Object.class).asType(MH.type(Void.TYPE, Object.class, String.class, Object.class)); |
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234 |
static final MethodHandle JSOBJECT_SETSLOT = findJSObjectMH_V("setSlot", Void.TYPE, int.class, Object.class).asType(MH.type(Void.TYPE, Object.class, int.class, Object.class)); |
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static final MethodHandle JSOBJECT_CALL = findJSObjectMH_V("call", Object.class, String.class, Object[].class).asType(MH.type(Object.class, Object.class, String.class, Object[].class)); |
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|
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237 |
private static MethodHandle findJSObjectMH_V(final String name, final Class<?> rtype, final Class<?>... types) { |
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238 |
checkJSObjectClass(); |
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239 |
return MH.findVirtual(MethodHandles.publicLookup(), jsObjectClass, name, MH.type(rtype, types)); |
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240 |
} |
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241 |
} |
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242 |
} |