| /* |
| * 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.runtime.ECMAErrors.typeError; |
| import static jdk.nashorn.internal.runtime.ScriptRuntime.UNDEFINED; |
| import static jdk.nashorn.internal.lookup.Lookup.MH; |
| |
| import java.lang.invoke.MethodHandle; |
| import java.lang.invoke.MethodType; |
| import java.lang.reflect.Method; |
| import java.lang.reflect.Modifier; |
| import java.util.Map; |
| import java.util.HashMap; |
| import jdk.internal.dynalink.CallSiteDescriptor; |
| import jdk.internal.dynalink.beans.BeansLinker; |
| import jdk.internal.dynalink.linker.GuardedInvocation; |
| import jdk.internal.dynalink.linker.GuardingDynamicLinker; |
| import jdk.internal.dynalink.linker.GuardingTypeConverterFactory; |
| import jdk.internal.dynalink.linker.LinkRequest; |
| import jdk.internal.dynalink.linker.LinkerServices; |
| import jdk.internal.dynalink.support.Guards; |
| import jdk.nashorn.internal.runtime.Context; |
| import jdk.nashorn.internal.runtime.JSType; |
| import jdk.nashorn.internal.runtime.ScriptRuntime; |
| |
| /** |
| * Nashorn bottom linker; used as a last-resort catch-all linker for all linking requests that fall through all other |
| * linkers (see how {@link Bootstrap} class configures the dynamic linker in its static initializer). It will throw |
| * appropriate ECMAScript errors for attempts to invoke operations on {@code null}, link no-op property getters and |
| * setters for Java objects that couldn't be linked by any other linker, and throw appropriate ECMAScript errors for |
| * attempts to invoke arbitrary Java objects as functions or constructors. |
| */ |
| final class NashornBottomLinker implements GuardingDynamicLinker, GuardingTypeConverterFactory { |
| |
| @Override |
| public GuardedInvocation getGuardedInvocation(final LinkRequest linkRequest, final LinkerServices linkerServices) |
| throws Exception { |
| final Object self = linkRequest.getReceiver(); |
| |
| if (self == null) { |
| return linkNull(linkRequest); |
| } |
| |
| // None of the objects that can be linked by NashornLinker should ever reach here. Basically, anything below |
| // this point is a generic Java bean. Therefore, reaching here with a ScriptObject is a Nashorn bug. |
| assert isExpectedObject(self) : "Couldn't link " + linkRequest.getCallSiteDescriptor() + " for " + self.getClass().getName(); |
| |
| return linkBean(linkRequest, linkerServices); |
| } |
| |
| private static final MethodHandle EMPTY_PROP_GETTER = |
| MH.dropArguments(MH.constant(Object.class, UNDEFINED), 0, Object.class); |
| private static final MethodHandle EMPTY_ELEM_GETTER = |
| MH.dropArguments(EMPTY_PROP_GETTER, 0, Object.class); |
| private static final MethodHandle EMPTY_PROP_SETTER = |
| MH.asType(EMPTY_ELEM_GETTER, EMPTY_ELEM_GETTER.type().changeReturnType(void.class)); |
| private static final MethodHandle EMPTY_ELEM_SETTER = |
| MH.dropArguments(EMPTY_PROP_SETTER, 0, Object.class); |
| |
| private static GuardedInvocation linkBean(final LinkRequest linkRequest, final LinkerServices linkerServices) throws Exception { |
| final NashornCallSiteDescriptor desc = (NashornCallSiteDescriptor)linkRequest.getCallSiteDescriptor(); |
| final Object self = linkRequest.getReceiver(); |
| final String operator = desc.getFirstOperator(); |
| switch (operator) { |
| case "new": |
| if(BeansLinker.isDynamicMethod(self)) { |
| throw typeError("method.not.constructor", ScriptRuntime.safeToString(self)); |
| } |
| throw typeError("not.a.function", ScriptRuntime.safeToString(self)); |
| case "call": |
| // Support dyn:call on any object that supports some @FunctionalInterface |
| // annotated interface. This way Java method, constructor references or |
| // implementations of java.util.function.* interfaces can be called as though |
| // those are script functions. |
| final Method m = getFunctionalInterfaceMethod(self.getClass()); |
| if (m != null) { |
| final MethodType callType = desc.getMethodType(); |
| // 'callee' and 'thiz' passed from script + actual arguments |
| if (callType.parameterCount() != m.getParameterCount() + 2) { |
| throw typeError("no.method.matches.args", ScriptRuntime.safeToString(self)); |
| } |
| return new GuardedInvocation( |
| // drop 'thiz' passed from the script. |
| MH.dropArguments(desc.getLookup().unreflect(m), 1, callType.parameterType(1)), |
| Guards.getInstanceOfGuard(m.getDeclaringClass())).asType(callType); |
| } |
| if(BeansLinker.isDynamicMethod(self)) { |
| throw typeError("no.method.matches.args", ScriptRuntime.safeToString(self)); |
| } |
| throw typeError("not.a.function", ScriptRuntime.safeToString(self)); |
| case "callMethod": |
| case "getMethod": |
| throw typeError("no.such.function", getArgument(linkRequest), ScriptRuntime.safeToString(self)); |
| case "getProp": |
| case "getElem": |
| if (desc.getOperand() != null) { |
| return getInvocation(EMPTY_PROP_GETTER, self, linkerServices, desc); |
| } |
| return getInvocation(EMPTY_ELEM_GETTER, self, linkerServices, desc); |
| case "setProp": |
| case "setElem": |
| if (desc.getOperand() != null) { |
| return getInvocation(EMPTY_PROP_SETTER, self, linkerServices, desc); |
| } |
| return getInvocation(EMPTY_ELEM_SETTER, self, linkerServices, desc); |
| default: |
| break; |
| } |
| throw new AssertionError("unknown call type " + desc); |
| } |
| |
| @Override |
| public GuardedInvocation convertToType(final Class<?> sourceType, final Class<?> targetType) throws Exception { |
| final GuardedInvocation gi = convertToTypeNoCast(sourceType, targetType); |
| return gi == null ? null : gi.asType(MH.type(targetType, sourceType)); |
| } |
| |
| /** |
| * Main part of the implementation of {@link GuardingTypeConverterFactory#convertToType(Class, Class)} that doesn't |
| * care about adapting the method signature; that's done by the invoking method. Returns conversion from Object to String/number/boolean (JS primitive types). |
| * @param sourceType the source type |
| * @param targetType the target type |
| * @return a guarded invocation that converts from the source type to the target type. |
| * @throws Exception if something goes wrong |
| */ |
| private static GuardedInvocation convertToTypeNoCast(final Class<?> sourceType, final Class<?> targetType) throws Exception { |
| final MethodHandle mh = CONVERTERS.get(targetType); |
| if (mh != null) { |
| return new GuardedInvocation(mh, null); |
| } |
| |
| return null; |
| } |
| |
| private static GuardedInvocation getInvocation(final MethodHandle handle, final Object self, final LinkerServices linkerServices, final CallSiteDescriptor desc) { |
| return Bootstrap.asType(new GuardedInvocation(handle, Guards.getClassGuard(self.getClass())), linkerServices, desc); |
| } |
| |
| // Used solely in an assertion to figure out if the object we get here is something we in fact expect. Objects |
| // linked by NashornLinker should never reach here. |
| private static boolean isExpectedObject(final Object obj) { |
| return !(NashornLinker.canLinkTypeStatic(obj.getClass())); |
| } |
| |
| private static GuardedInvocation linkNull(final LinkRequest linkRequest) { |
| final NashornCallSiteDescriptor desc = (NashornCallSiteDescriptor)linkRequest.getCallSiteDescriptor(); |
| final String operator = desc.getFirstOperator(); |
| switch (operator) { |
| case "new": |
| case "call": |
| throw typeError("not.a.function", "null"); |
| case "callMethod": |
| case "getMethod": |
| throw typeError("no.such.function", getArgument(linkRequest), "null"); |
| case "getProp": |
| case "getElem": |
| throw typeError("cant.get.property", getArgument(linkRequest), "null"); |
| case "setProp": |
| case "setElem": |
| throw typeError("cant.set.property", getArgument(linkRequest), "null"); |
| default: |
| break; |
| } |
| throw new AssertionError("unknown call type " + desc); |
| } |
| |
| private static final Map<Class<?>, MethodHandle> CONVERTERS = new HashMap<>(); |
| static { |
| CONVERTERS.put(boolean.class, JSType.TO_BOOLEAN.methodHandle()); |
| CONVERTERS.put(double.class, JSType.TO_NUMBER.methodHandle()); |
| CONVERTERS.put(int.class, JSType.TO_INTEGER.methodHandle()); |
| CONVERTERS.put(long.class, JSType.TO_LONG.methodHandle()); |
| CONVERTERS.put(String.class, JSType.TO_STRING.methodHandle()); |
| } |
| |
| private static String getArgument(final LinkRequest linkRequest) { |
| final CallSiteDescriptor desc = linkRequest.getCallSiteDescriptor(); |
| if (desc.getNameTokenCount() > 2) { |
| return desc.getNameToken(2); |
| } |
| return ScriptRuntime.safeToString(linkRequest.getArguments()[1]); |
| } |
| |
| // cache of @FunctionalInterface method of implementor classes |
| private static final ClassValue<Method> FUNCTIONAL_IFACE_METHOD = new ClassValue<Method>() { |
| @Override |
| protected Method computeValue(final Class<?> type) { |
| return findFunctionalInterfaceMethod(type); |
| } |
| |
| private Method findFunctionalInterfaceMethod(final Class<?> clazz) { |
| if (clazz == null) { |
| return null; |
| } |
| |
| for (Class<?> iface : clazz.getInterfaces()) { |
| // check accessiblity up-front |
| if (! Context.isAccessibleClass(iface)) { |
| continue; |
| } |
| |
| // check for @FunctionalInterface |
| if (iface.isAnnotationPresent(FunctionalInterface.class)) { |
| // return the first abstract method |
| for (final Method m : iface.getMethods()) { |
| if (Modifier.isAbstract(m.getModifiers())) { |
| return m; |
| } |
| } |
| } |
| } |
| |
| // did not find here, try super class |
| return findFunctionalInterfaceMethod(clazz.getSuperclass()); |
| } |
| }; |
| |
| // Returns @FunctionalInterface annotated interface's single abstract |
| // method. If not found, returns null. |
| static Method getFunctionalInterfaceMethod(final Class<?> clazz) { |
| return FUNCTIONAL_IFACE_METHOD.get(clazz); |
| } |
| } |