Mercurial > hg > shenandoah-preopenjdk-archive > openjdk8 > nashorn
view src/jdk/nashorn/internal/runtime/linker/BrowserJSObjectLinker.java @ 1079:e1e27c4262be
8060204: Fix warnings in Joni and tests
Reviewed-by: hannesw, sundar, attila
author | lagergren |
---|---|
date | Mon, 03 Nov 2014 11:47:41 +0100 |
parents | 934689dc9f10 |
children |
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/* * Copyright (c) 2014, 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.runtime.linker.BrowserJSObjectLinker.JSObjectHandles.JSOBJECT_GETMEMBER; import static jdk.nashorn.internal.runtime.linker.BrowserJSObjectLinker.JSObjectHandles.JSOBJECT_GETSLOT; import static jdk.nashorn.internal.runtime.linker.BrowserJSObjectLinker.JSObjectHandles.JSOBJECT_SETMEMBER; import static jdk.nashorn.internal.runtime.linker.BrowserJSObjectLinker.JSObjectHandles.JSOBJECT_SETSLOT; import java.lang.invoke.MethodHandle; import java.lang.invoke.MethodHandles; import jdk.internal.dynalink.CallSiteDescriptor; import jdk.internal.dynalink.linker.GuardedInvocation; import jdk.internal.dynalink.linker.LinkRequest; import jdk.internal.dynalink.linker.LinkerServices; import jdk.internal.dynalink.linker.TypeBasedGuardingDynamicLinker; import jdk.internal.dynalink.support.CallSiteDescriptorFactory; import jdk.nashorn.internal.lookup.MethodHandleFactory; import jdk.nashorn.internal.lookup.MethodHandleFunctionality; import jdk.nashorn.internal.runtime.JSType; /** * A Dynalink linker to handle web browser built-in JS (DOM etc.) objects. */ final class BrowserJSObjectLinker implements TypeBasedGuardingDynamicLinker { private static final ClassLoader myLoader = BrowserJSObjectLinker.class.getClassLoader(); private static final String JSOBJECT_CLASS = "netscape.javascript.JSObject"; // not final because this is lazily initialized // when we hit a subclass for the first time. private static volatile Class<?> jsObjectClass; private final NashornBeansLinker nashornBeansLinker; BrowserJSObjectLinker(final NashornBeansLinker nashornBeansLinker) { this.nashornBeansLinker = nashornBeansLinker; } @Override public boolean canLinkType(final Class<?> type) { return canLinkTypeStatic(type); } static boolean canLinkTypeStatic(final Class<?> type) { if (jsObjectClass != null && jsObjectClass.isAssignableFrom(type)) { return true; } // check if this class is a subclass of JSObject Class<?> clazz = type; while (clazz != null) { if (clazz.getClassLoader() == myLoader && clazz.getName().equals(JSOBJECT_CLASS)) { jsObjectClass = clazz; return true; } clazz = clazz.getSuperclass(); } return false; } private static void checkJSObjectClass() { assert jsObjectClass != null : JSOBJECT_CLASS + " not found!"; } @Override public GuardedInvocation getGuardedInvocation(final LinkRequest request, final LinkerServices linkerServices) throws Exception { final LinkRequest requestWithoutContext = request.withoutRuntimeContext(); // Nashorn has no runtime context final Object self = requestWithoutContext.getReceiver(); final CallSiteDescriptor desc = requestWithoutContext.getCallSiteDescriptor(); checkJSObjectClass(); if (desc.getNameTokenCount() < 2 || !"dyn".equals(desc.getNameToken(CallSiteDescriptor.SCHEME))) { // We only support standard "dyn:*[:*]" operations return null; } final GuardedInvocation inv; if (jsObjectClass.isInstance(self)) { inv = lookup(desc, request, linkerServices); } else { throw new AssertionError(); // Should never reach here. } return Bootstrap.asTypeSafeReturn(inv, linkerServices, desc); } private GuardedInvocation lookup(final CallSiteDescriptor desc, final LinkRequest request, final LinkerServices linkerServices) throws Exception { final String operator = CallSiteDescriptorFactory.tokenizeOperators(desc).get(0); final int c = desc.getNameTokenCount(); switch (operator) { case "getProp": case "getElem": case "getMethod": if (c > 2) { return findGetMethod(desc); } // For indexed get, we want GuardedInvocation from beans linker and pass it. // BrowserJSObjectLinker.get uses this fallback getter for explicit signature method access. return findGetIndexMethod(nashornBeansLinker.getGuardedInvocation(request, linkerServices)); case "setProp": case "setElem": return c > 2 ? findSetMethod(desc) : findSetIndexMethod(); default: return null; } } private static GuardedInvocation findGetMethod(final CallSiteDescriptor desc) { final String name = desc.getNameToken(CallSiteDescriptor.NAME_OPERAND); final MethodHandle getter = MH.insertArguments(JSOBJECT_GETMEMBER, 1, name); return new GuardedInvocation(getter, IS_JSOBJECT_GUARD); } private static GuardedInvocation findGetIndexMethod(final GuardedInvocation inv) { final MethodHandle getter = MH.insertArguments(JSOBJECTLINKER_GET, 0, inv.getInvocation()); return inv.replaceMethods(getter, inv.getGuard()); } private static GuardedInvocation findSetMethod(final CallSiteDescriptor desc) { final MethodHandle getter = MH.insertArguments(JSOBJECT_SETMEMBER, 1, desc.getNameToken(2)); return new GuardedInvocation(getter, IS_JSOBJECT_GUARD); } private static GuardedInvocation findSetIndexMethod() { return new GuardedInvocation(JSOBJECTLINKER_PUT, IS_JSOBJECT_GUARD); } @SuppressWarnings("unused") private static boolean isJSObject(final Object self) { return jsObjectClass.isInstance(self); } @SuppressWarnings("unused") private static Object get(final MethodHandle fallback, final Object jsobj, final Object key) throws Throwable { if (key instanceof Integer) { return JSOBJECT_GETSLOT.invokeExact(jsobj, (int)key); } else if (key instanceof Number) { final int index = getIndex((Number)key); if (index > -1) { return JSOBJECT_GETSLOT.invokeExact(jsobj, index); } } else if (key instanceof String) { final String name = (String)key; if (name.indexOf('(') != -1) { return fallback.invokeExact(jsobj, key); } return JSOBJECT_GETMEMBER.invokeExact(jsobj, (String)key); } return null; } @SuppressWarnings("unused") private static void put(final Object jsobj, final Object key, final Object value) throws Throwable { if (key instanceof Integer) { JSOBJECT_SETSLOT.invokeExact(jsobj, (int)key, value); } else if (key instanceof Number) { JSOBJECT_SETSLOT.invokeExact(jsobj, getIndex((Number)key), value); } else if (key instanceof String) { JSOBJECT_SETMEMBER.invokeExact(jsobj, (String)key, value); } } private static int getIndex(final Number n) { final double value = n.doubleValue(); return JSType.isRepresentableAsInt(value) ? (int)value : -1; } private static final MethodHandleFunctionality MH = MethodHandleFactory.getFunctionality(); // method handles of the current class private static final MethodHandle IS_JSOBJECT_GUARD = findOwnMH_S("isJSObject", boolean.class, Object.class); private static final MethodHandle JSOBJECTLINKER_GET = findOwnMH_S("get", Object.class, MethodHandle.class, Object.class, Object.class); private static final MethodHandle JSOBJECTLINKER_PUT = findOwnMH_S("put", Void.TYPE, Object.class, Object.class, Object.class); private static MethodHandle findOwnMH_S(final String name, final Class<?> rtype, final Class<?>... types) { return MH.findStatic(MethodHandles.lookup(), BrowserJSObjectLinker.class, name, MH.type(rtype, types)); } // method handles of netscape.javascript.JSObject class // These are in separate class as we lazily initialize these // method handles when we hit a subclass of JSObject first time. static class JSObjectHandles { // method handles of JSObject class static final MethodHandle JSOBJECT_GETMEMBER = findJSObjectMH_V("getMember", Object.class, String.class).asType(MH.type(Object.class, Object.class, String.class)); static final MethodHandle JSOBJECT_GETSLOT = findJSObjectMH_V("getSlot", Object.class, int.class).asType(MH.type(Object.class, Object.class, int.class)); 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)); 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)); private static MethodHandle findJSObjectMH_V(final String name, final Class<?> rtype, final Class<?>... types) { checkJSObjectClass(); return MH.findVirtual(MethodHandles.publicLookup(), jsObjectClass, name, MH.type(rtype, types)); } } }