/* * 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.codegen.CompilerConstants.staticCallNoLookup; import java.lang.invoke.CallSite; import java.lang.invoke.MethodHandle; import java.lang.invoke.MethodHandles; import java.lang.invoke.MethodHandles.Lookup; import java.lang.invoke.MethodType; import jdk.internal.dynalink.CallSiteDescriptor; import jdk.internal.dynalink.DynamicLinker; import jdk.internal.dynalink.DynamicLinkerFactory; import jdk.internal.dynalink.beans.BeansLinker; import jdk.internal.dynalink.beans.StaticClass; import jdk.internal.dynalink.linker.GuardedInvocation; import jdk.internal.dynalink.linker.LinkerServices; import jdk.nashorn.api.scripting.JSObject; import jdk.nashorn.internal.codegen.CompilerConstants.Call; import jdk.nashorn.internal.codegen.RuntimeCallSite; import jdk.nashorn.internal.runtime.JSType; import jdk.nashorn.internal.runtime.ScriptFunction; import jdk.nashorn.internal.runtime.ScriptRuntime; import jdk.nashorn.internal.runtime.options.Options; /** * This class houses bootstrap method for invokedynamic instructions generated by compiler. */ public final class Bootstrap { /** Reference to the seed boostrap function */ public static final Call BOOTSTRAP = staticCallNoLookup(Bootstrap.class, "bootstrap", CallSite.class, Lookup.class, String.class, MethodType.class, int.class); // do not create me!! private Bootstrap() { } private static final DynamicLinker dynamicLinker; static { final DynamicLinkerFactory factory = new DynamicLinkerFactory(); final NashornBeansLinker nashornBeansLinker = new NashornBeansLinker(); final JSObjectLinker jsObjectLinker = new JSObjectLinker(nashornBeansLinker); factory.setPrioritizedLinkers( new NashornLinker(), new NashornPrimitiveLinker(), new NashornStaticClassLinker(), new BoundDynamicMethodLinker(), new JavaSuperAdapterLinker(), jsObjectLinker, new ReflectionCheckLinker()); factory.setFallbackLinkers(nashornBeansLinker, new NashornBottomLinker()); factory.setSyncOnRelink(true); final int relinkThreshold = Options.getIntProperty("nashorn.unstable.relink.threshold", -1); if (relinkThreshold > -1) { factory.setUnstableRelinkThreshold(relinkThreshold); } // Linkers for any additional language runtimes deployed alongside Nashorn will be picked up by the factory. factory.setClassLoader(Bootstrap.class.getClassLoader()); dynamicLinker = factory.createLinker(); } /** * Returns if the given object is a "callable" * @param obj object to be checked for callability * @return true if the obj is callable */ public static boolean isCallable(final Object obj) { if (obj == ScriptRuntime.UNDEFINED || obj == null) { return false; } return obj instanceof ScriptFunction || ((obj instanceof JSObject) && ((JSObject)obj).isFunction()) || isDynamicMethod(obj) || isFunctionalInterfaceObject(obj) || obj instanceof StaticClass; } /** * Returns if the given object is a dynalink Dynamic method * @param obj object to be checked * @return true if the obj is a dynamic method */ public static boolean isDynamicMethod(final Object obj) { return obj instanceof BoundDynamicMethod || BeansLinker.isDynamicMethod(obj); } /** * Returns if the given object is an instance of an interface annotated with * java.lang.FunctionalInterface * @param obj object to be checked * @return true if the obj is an instance of @FunctionalInterface interface */ public static boolean isFunctionalInterfaceObject(final Object obj) { return !JSType.isPrimitive(obj) && (NashornBottomLinker.getFunctionalInterfaceMethod(obj.getClass()) != null); } /** * Create a call site and link it for Nashorn. This version of the method conforms to the invokedynamic bootstrap * method expected signature and is referenced from Nashorn generated bytecode as the bootstrap method for all * invokedynamic instructions. * @param lookup MethodHandle lookup. Ignored as Nashorn only uses public lookup. * @param opDesc Dynalink dynamic operation descriptor. * @param type Method type. * @param flags flags for call type, trace/profile etc. * @return CallSite with MethodHandle to appropriate method or null if not found. */ public static CallSite bootstrap(final Lookup lookup, final String opDesc, final MethodType type, final int flags) { return dynamicLinker.link(LinkerCallSite.newLinkerCallSite(lookup, opDesc, type, flags)); } /** * Bootstrapper for a specialized Runtime call * * @param lookup lookup * @param initialName initial name for callsite * @param type method type for call site * * @return callsite for a runtime node */ public static CallSite runtimeBootstrap(final MethodHandles.Lookup lookup, final String initialName, final MethodType type) { return new RuntimeCallSite(type, initialName); } /** * Returns a dynamic invoker for a specified dynamic operation using the public lookup. You can use this method to * create a method handle that when invoked acts completely as if it were a Nashorn-linked call site. An overview of * available dynamic operations can be found in the * Dynalink User Guide, but we'll show few * examples here: *
* MethodHandle getColor = Boostrap.createDynamicInvoker("dyn:getProp:color", Object.class, Object.class); * Object obj = ...; // somehow obtain the object * Object color = getColor.invokeExact(obj); **
* MethodHandle getProperty = Boostrap.createDynamicInvoker("dyn:getElem", Object.class, Object.class, String.class); * Object obj = ...; // somehow obtain the object * Object color = getProperty.invokeExact(obj, "color"); * Object shape = getProperty.invokeExact(obj, "shape"); * MethodHandle getNumProperty = Boostrap.createDynamicInvoker("dyn:getElem", Object.class, Object.class, int.class); * Object elem42 = getNumProperty.invokeExact(obj, 42); **
* MethodHandle setColor = Boostrap.createDynamicInvoker("dyn:setProp:color", void.class, Object.class, Object.class); * Object obj = ...; // somehow obtain the object * setColor.invokeExact(obj, Color.BLUE); **
* MethodHandle setProperty = Boostrap.createDynamicInvoker("dyn:setElem", void.class, Object.class, String.class, Object.class); * Object obj = ...; // somehow obtain the object * setProperty.invokeExact(obj, "color", Color.BLUE); * setProperty.invokeExact(obj, "shape", Shape.CIRCLE); **
* MethodHandle findFooFunction = Boostrap.createDynamicInvoker("dyn:getMethod:foo", Object.class, Object.class); * Object obj = ...; // somehow obtain the object * Object foo_fn = findFooFunction.invokeExact(obj); * MethodHandle callFunctionWithTwoArgs = Boostrap.createDynamicInvoker("dyn:call", Object.class, Object.class, Object.class, Object.class, Object.class); * // Note: "call" operation takes a function, then a "this" value, then the arguments: * Object foo_retval = callFunctionWithTwoArgs.invokeExact(foo_fn, obj, arg1, arg2); **
* MethodHandle callFunctionFooWithTwoArgs = Boostrap.createDynamicInvoker("dyn:callMethod:foo", Object.class, Object.class, Object.class, Object.class); * Object obj = ...; // somehow obtain the object * Object foo_retval = callFunctionFooWithTwoArgs.invokeExact(obj, arg1, arg2); **