| /* |
| * 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.JSType.isString; |
| import static jdk.nashorn.internal.runtime.linker.BrowserJSObjectLinker.JSObjectHandles.JSOBJECT_CALL; |
| 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; |
| } |
| |
| GuardedInvocation inv; |
| if (jsObjectClass.isInstance(self)) { |
| inv = lookup(desc, request, linkerServices); |
| inv = inv.replaceMethods(linkerServices.filterInternalObjects(inv.getInvocation()), inv.getGuard()); |
| } 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(); |
| GuardedInvocation inv; |
| try { |
| inv = nashornBeansLinker.getGuardedInvocation(request, linkerServices); |
| } catch (Throwable th) { |
| inv = null; |
| } |
| |
| switch (operator) { |
| case "getProp": |
| case "getElem": |
| case "getMethod": |
| return c > 2? findGetMethod(desc, inv) : findGetIndexMethod(inv); |
| case "setProp": |
| case "setElem": |
| return c > 2? findSetMethod(desc, inv) : findSetIndexMethod(); |
| case "call": |
| return findCallMethod(desc); |
| default: |
| return null; |
| } |
| } |
| |
| private static GuardedInvocation findGetMethod(final CallSiteDescriptor desc, final GuardedInvocation inv) { |
| if (inv != null) { |
| return inv; |
| } |
| 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 GuardedInvocation inv) { |
| if (inv != null) { |
| return inv; |
| } |
| 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); |
| } |
| |
| private static GuardedInvocation findCallMethod(final CallSiteDescriptor desc) { |
| final MethodHandle call = MH.insertArguments(JSOBJECT_CALL, 1, "call"); |
| return new GuardedInvocation(MH.asCollector(call, Object[].class, desc.getMethodType().parameterCount() - 1), 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 (isString(key)) { |
| final String name = key.toString(); |
| if (name.indexOf('(') != -1) { |
| return fallback.invokeExact(jsobj, (Object) name); |
| } |
| return JSOBJECT_GETMEMBER.invokeExact(jsobj, name); |
| } |
| 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 (isString(key)) { |
| JSOBJECT_SETMEMBER.invokeExact(jsobj, key.toString(), 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)); |
| 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)); |
| |
| 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)); |
| } |
| } |
| } |