| /* |
| * Copyright (c) 2010, 2016, 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 java.lang.invoke.MethodHandle; |
| import java.lang.invoke.MethodHandles; |
| import java.lang.invoke.MethodType; |
| import java.util.Map; |
| import javax.script.Bindings; |
| import jdk.dynalink.CallSiteDescriptor; |
| import jdk.dynalink.Operation; |
| import jdk.dynalink.StandardOperation; |
| import jdk.dynalink.linker.GuardedInvocation; |
| import jdk.dynalink.linker.LinkRequest; |
| import jdk.dynalink.linker.LinkerServices; |
| import jdk.dynalink.linker.TypeBasedGuardingDynamicLinker; |
| import jdk.nashorn.api.scripting.JSObject; |
| import jdk.nashorn.api.scripting.ScriptObjectMirror; |
| import jdk.nashorn.internal.lookup.MethodHandleFactory; |
| import jdk.nashorn.internal.lookup.MethodHandleFunctionality; |
| import jdk.nashorn.internal.runtime.Context; |
| import jdk.nashorn.internal.runtime.JSType; |
| import jdk.nashorn.internal.runtime.ScriptRuntime; |
| import jdk.nashorn.internal.objects.Global; |
| |
| /** |
| * A Dynalink linker to handle web browser built-in JS (DOM etc.) objects as well |
| * as ScriptObjects from other Nashorn contexts. |
| */ |
| final class JSObjectLinker implements TypeBasedGuardingDynamicLinker { |
| private final NashornBeansLinker nashornBeansLinker; |
| |
| JSObjectLinker(final NashornBeansLinker nashornBeansLinker) { |
| this.nashornBeansLinker = nashornBeansLinker; |
| } |
| |
| @Override |
| public boolean canLinkType(final Class<?> type) { |
| return canLinkTypeStatic(type); |
| } |
| |
| static boolean canLinkTypeStatic(final Class<?> type) { |
| // can link JSObject also handles Map, Bindings to make |
| // sure those are not JSObjects. |
| return Map.class.isAssignableFrom(type) || |
| Bindings.class.isAssignableFrom(type) || |
| JSObject.class.isAssignableFrom(type); |
| } |
| |
| @Override |
| public GuardedInvocation getGuardedInvocation(final LinkRequest request, final LinkerServices linkerServices) throws Exception { |
| final Object self = request.getReceiver(); |
| final CallSiteDescriptor desc = request.getCallSiteDescriptor(); |
| if (self == null || !canLinkTypeStatic(self.getClass())) { |
| return null; |
| } |
| |
| GuardedInvocation inv; |
| if (self instanceof JSObject) { |
| inv = lookup(desc, request, linkerServices); |
| inv = inv.replaceMethods(linkerServices.filterInternalObjects(inv.getInvocation()), inv.getGuard()); |
| } else if (self instanceof Map || self instanceof Bindings) { |
| // guard to make sure the Map or Bindings does not turn into JSObject later! |
| final GuardedInvocation beanInv = nashornBeansLinker.getGuardedInvocation(request, linkerServices); |
| inv = new GuardedInvocation(beanInv.getInvocation(), |
| NashornGuards.combineGuards(beanInv.getGuard(), NashornGuards.getNotJSObjectGuard())); |
| } else { |
| throw new AssertionError("got instanceof: " + self.getClass()); // 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 Operation op = NashornCallSiteDescriptor.getBaseOperation(desc); |
| if (op instanceof StandardOperation) { |
| final String name = NashornCallSiteDescriptor.getOperand(desc); |
| switch ((StandardOperation)op) { |
| case GET: |
| if (NashornCallSiteDescriptor.hasStandardNamespace(desc)) { |
| if (name != null) { |
| return findGetMethod(name); |
| } |
| // For indexed get, we want get GuardedInvocation beans linker and pass it. |
| // JSObjectLinker.get uses this fallback getter for explicit signature method access. |
| return findGetIndexMethod(nashornBeansLinker.getGuardedInvocation(request, linkerServices)); |
| } |
| break; |
| case SET: |
| if (NashornCallSiteDescriptor.hasStandardNamespace(desc)) { |
| return name != null ? findSetMethod(name) : findSetIndexMethod(); |
| } |
| break; |
| case CALL: |
| return findCallMethod(desc); |
| case NEW: |
| return findNewMethod(desc); |
| default: |
| } |
| } |
| return null; |
| } |
| |
| private static GuardedInvocation findGetMethod(final String name) { |
| 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 String name) { |
| final MethodHandle getter = MH.insertArguments(JSOBJECT_SETMEMBER, 1, name); |
| 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) { |
| MethodHandle mh = NashornCallSiteDescriptor.isScope(desc)? JSOBJECT_SCOPE_CALL : JSOBJECT_CALL; |
| if (NashornCallSiteDescriptor.isApplyToCall(desc)) { |
| mh = MH.insertArguments(JSOBJECT_CALL_TO_APPLY, 0, mh); |
| } |
| final MethodType type = desc.getMethodType(); |
| mh = type.parameterType(type.parameterCount() - 1) == Object[].class ? |
| mh : |
| MH.asCollector(mh, Object[].class, type.parameterCount() - 2); |
| return new GuardedInvocation(mh, IS_JSOBJECT_GUARD); |
| } |
| |
| private static GuardedInvocation findNewMethod(final CallSiteDescriptor desc) { |
| final MethodHandle func = MH.asCollector(JSOBJECT_NEW, Object[].class, desc.getMethodType().parameterCount() - 1); |
| return new GuardedInvocation(func, IS_JSOBJECT_GUARD); |
| } |
| |
| @SuppressWarnings("unused") |
| private static boolean isJSObject(final Object self) { |
| return self instanceof JSObject; |
| } |
| |
| @SuppressWarnings("unused") |
| private static Object get(final MethodHandle fallback, final Object jsobj, final Object key) |
| throws Throwable { |
| if (key instanceof Integer) { |
| return ((JSObject)jsobj).getSlot((Integer)key); |
| } else if (key instanceof Number) { |
| final int index = getIndex((Number)key); |
| if (index > -1) { |
| return ((JSObject)jsobj).getSlot(index); |
| } else { |
| return ((JSObject)jsobj).getMember(JSType.toString(key)); |
| } |
| } else if (isString(key)) { |
| final String name = key.toString(); |
| // get with method name and signature. delegate it to beans linker! |
| if (name.indexOf('(') != -1) { |
| return fallback.invokeExact(jsobj, (Object) name); |
| } |
| return ((JSObject)jsobj).getMember(name); |
| } |
| return null; |
| } |
| |
| @SuppressWarnings("unused") |
| private static void put(final Object jsobj, final Object key, final Object value) { |
| if (key instanceof Integer) { |
| ((JSObject)jsobj).setSlot((Integer)key, value); |
| } else if (key instanceof Number) { |
| final int index = getIndex((Number)key); |
| if (index > -1) { |
| ((JSObject)jsobj).setSlot(index, value); |
| } else { |
| ((JSObject)jsobj).setMember(JSType.toString(key), value); |
| } |
| } else if (isString(key)) { |
| ((JSObject)jsobj).setMember(key.toString(), value); |
| } |
| } |
| |
| private static int getIndex(final Number n) { |
| final double value = n.doubleValue(); |
| return JSType.isRepresentableAsInt(value) ? (int)value : -1; |
| } |
| |
| @SuppressWarnings("unused") |
| private static Object callToApply(final MethodHandle mh, final JSObject obj, final Object thiz, final Object... args) { |
| assert args.length >= 1; |
| final Object receiver = args[0]; |
| final Object[] arguments = new Object[args.length - 1]; |
| System.arraycopy(args, 1, arguments, 0, arguments.length); |
| try { |
| return mh.invokeExact(obj, thiz, new Object[] { receiver, arguments }); |
| } catch (final RuntimeException | Error e) { |
| throw e; |
| } catch (final Throwable e) { |
| throw new RuntimeException(e); |
| } |
| } |
| |
| // This is used when a JSObject is called as scope call to do undefined -> Global this translation. |
| @SuppressWarnings("unused") |
| private static Object jsObjectScopeCall(final JSObject jsObj, final Object thiz, final Object[] args) { |
| final Object modifiedThiz; |
| if (thiz == ScriptRuntime.UNDEFINED && !jsObj.isStrictFunction()) { |
| final Global global = Context.getGlobal(); |
| modifiedThiz = ScriptObjectMirror.wrap(global, global); |
| } else { |
| modifiedThiz = thiz; |
| } |
| return jsObj.call(modifiedThiz, args); |
| } |
| |
| 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); |
| |
| // method handles of JSObject class |
| private static final MethodHandle JSOBJECT_GETMEMBER = findJSObjectMH_V("getMember", Object.class, String.class); |
| private static final MethodHandle JSOBJECT_SETMEMBER = findJSObjectMH_V("setMember", Void.TYPE, String.class, Object.class); |
| private static final MethodHandle JSOBJECT_CALL = findJSObjectMH_V("call", Object.class, Object.class, Object[].class); |
| private static final MethodHandle JSOBJECT_SCOPE_CALL = findOwnMH_S("jsObjectScopeCall", Object.class, JSObject.class, Object.class, Object[].class); |
| private static final MethodHandle JSOBJECT_CALL_TO_APPLY = findOwnMH_S("callToApply", Object.class, MethodHandle.class, JSObject.class, Object.class, Object[].class); |
| private static final MethodHandle JSOBJECT_NEW = findJSObjectMH_V("newObject", Object.class, Object[].class); |
| |
| private static MethodHandle findJSObjectMH_V(final String name, final Class<?> rtype, final Class<?>... types) { |
| return MH.findVirtual(MethodHandles.lookup(), JSObject.class, name, MH.type(rtype, types)); |
| } |
| |
| private static MethodHandle findOwnMH_S(final String name, final Class<?> rtype, final Class<?>... types) { |
| return MH.findStatic(MethodHandles.lookup(), JSObjectLinker.class, name, MH.type(rtype, types)); |
| } |
| } |