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/*
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* Copyright (c) 2008, 2013, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package java.lang.invoke;
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import sun.invoke.empty.Empty;
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import static java.lang.invoke.MethodHandleStatics.*;
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import static java.lang.invoke.MethodHandles.Lookup.IMPL_LOOKUP;
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/**
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* A {@code CallSite} is a holder for a variable {@link MethodHandle},
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* which is called its {@code target}.
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* An {@code invokedynamic} instruction linked to a {@code CallSite} delegates
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* all calls to the site's current target.
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* A {@code CallSite} may be associated with several {@code invokedynamic}
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* instructions, or it may be "free floating", associated with none.
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* In any case, it may be invoked through an associated method handle
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* called its {@linkplain #dynamicInvoker dynamic invoker}.
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* <p>
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* {@code CallSite} is an abstract class which does not allow
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* direct subclassing by users. It has three immediate,
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* concrete subclasses that may be either instantiated or subclassed.
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* <ul>
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* <li>If a mutable target is not required, an {@code invokedynamic} instruction
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* may be permanently bound by means of a {@linkplain ConstantCallSite constant call site}.
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* <li>If a mutable target is required which has volatile variable semantics,
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* because updates to the target must be immediately and reliably witnessed by other threads,
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* a {@linkplain VolatileCallSite volatile call site} may be used.
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* <li>Otherwise, if a mutable target is required,
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* a {@linkplain MutableCallSite mutable call site} may be used.
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* </ul>
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* <p>
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* A non-constant call site may be <em>relinked</em> by changing its target.
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* The new target must have the same {@linkplain MethodHandle#type() type}
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* as the previous target.
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* Thus, though a call site can be relinked to a series of
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* successive targets, it cannot change its type.
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* <p>
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* Here is a sample use of call sites and bootstrap methods which links every
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* dynamic call site to print its arguments:
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<blockquote><pre>{@code
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static void test() throws Throwable {
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// THE FOLLOWING LINE IS PSEUDOCODE FOR A JVM INSTRUCTION
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InvokeDynamic[#bootstrapDynamic].baz("baz arg", 2, 3.14);
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}
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private static void printArgs(Object... args) {
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System.out.println(java.util.Arrays.deepToString(args));
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}
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private static final MethodHandle printArgs;
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static {
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MethodHandles.Lookup lookup = MethodHandles.lookup();
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Class thisClass = lookup.lookupClass(); // (who am I?)
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printArgs = lookup.findStatic(thisClass,
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"printArgs", MethodType.methodType(void.class, Object[].class));
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}
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private static CallSite bootstrapDynamic(MethodHandles.Lookup caller, String name, MethodType type) {
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// ignore caller and name, but match the type:
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return new ConstantCallSite(printArgs.asType(type));
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}
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}</pre></blockquote>
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* @author John Rose, JSR 292 EG
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*/
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abstract
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public class CallSite {
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static { MethodHandleImpl.initStatics(); }
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// The actual payload of this call site:
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/*package-private*/
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MethodHandle target; // Note: This field is known to the JVM. Do not change.
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/**
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* Make a blank call site object with the given method type.
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* An initial target method is supplied which will throw
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* an {@link IllegalStateException} if called.
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* <p>
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* Before this {@code CallSite} object is returned from a bootstrap method,
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* it is usually provided with a more useful target method,
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* via a call to {@link CallSite#setTarget(MethodHandle) setTarget}.
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* @throws NullPointerException if the proposed type is null
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*/
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/*package-private*/
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CallSite(MethodType type) {
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target = type.invokers().uninitializedCallSite();
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}
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/**
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* Make a call site object equipped with an initial target method handle.
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* @param target the method handle which will be the initial target of the call site
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* @throws NullPointerException if the proposed target is null
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*/
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/*package-private*/
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CallSite(MethodHandle target) {
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target.type(); // null check
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this.target = target;
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}
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/**
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* Make a call site object equipped with an initial target method handle.
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* @param targetType the desired type of the call site
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* @param createTargetHook a hook which will bind the call site to the target method handle
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* @throws WrongMethodTypeException if the hook cannot be invoked on the required arguments,
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* or if the target returned by the hook is not of the given {@code targetType}
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* @throws NullPointerException if the hook returns a null value
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* @throws ClassCastException if the hook returns something other than a {@code MethodHandle}
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* @throws Throwable anything else thrown by the hook function
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*/
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/*package-private*/
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CallSite(MethodType targetType, MethodHandle createTargetHook) throws Throwable {
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this(targetType);
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ConstantCallSite selfCCS = (ConstantCallSite) this;
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MethodHandle boundTarget = (MethodHandle) createTargetHook.invokeWithArguments(selfCCS);
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checkTargetChange(this.target, boundTarget);
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this.target = boundTarget;
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}
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/**
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* Returns the type of this call site's target.
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* Although targets may change, any call site's type is permanent, and can never change to an unequal type.
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* The {@code setTarget} method enforces this invariant by refusing any new target that does
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* not have the previous target's type.
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* @return the type of the current target, which is also the type of any future target
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*/
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public MethodType type() {
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// warning: do not call getTarget here, because CCS.getTarget can throw IllegalStateException
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return target.type();
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}
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/**
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* Returns the target method of the call site, according to the
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* behavior defined by this call site's specific class.
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* The immediate subclasses of {@code CallSite} document the
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* class-specific behaviors of this method.
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*
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* @return the current linkage state of the call site, its target method handle
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* @see ConstantCallSite
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* @see VolatileCallSite
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* @see #setTarget
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* @see ConstantCallSite#getTarget
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* @see MutableCallSite#getTarget
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* @see VolatileCallSite#getTarget
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*/
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public abstract MethodHandle getTarget();
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/**
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* Updates the target method of this call site, according to the
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* behavior defined by this call site's specific class.
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* The immediate subclasses of {@code CallSite} document the
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* class-specific behaviors of this method.
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* <p>
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* The type of the new target must be {@linkplain MethodType#equals equal to}
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* the type of the old target.
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*
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* @param newTarget the new target
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* @throws NullPointerException if the proposed new target is null
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* @throws WrongMethodTypeException if the proposed new target
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* has a method type that differs from the previous target
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* @see CallSite#getTarget
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* @see ConstantCallSite#setTarget
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* @see MutableCallSite#setTarget
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* @see VolatileCallSite#setTarget
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*/
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public abstract void setTarget(MethodHandle newTarget);
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void checkTargetChange(MethodHandle oldTarget, MethodHandle newTarget) {
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MethodType oldType = oldTarget.type();
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MethodType newType = newTarget.type(); // null check!
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if (!newType.equals(oldType))
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throw wrongTargetType(newTarget, oldType);
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}
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private static WrongMethodTypeException wrongTargetType(MethodHandle target, MethodType type) {
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return new WrongMethodTypeException(String.valueOf(target)+" should be of type "+type);
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}
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/**
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* Produces a method handle equivalent to an invokedynamic instruction
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* which has been linked to this call site.
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* <p>
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* This method is equivalent to the following code:
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* <blockquote><pre>{@code
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* MethodHandle getTarget, invoker, result;
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* getTarget = MethodHandles.publicLookup().bind(this, "getTarget", MethodType.methodType(MethodHandle.class));
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* invoker = MethodHandles.exactInvoker(this.type());
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* result = MethodHandles.foldArguments(invoker, getTarget)
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* }</pre></blockquote>
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*
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* @return a method handle which always invokes this call site's current target
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*/
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public abstract MethodHandle dynamicInvoker();
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/*non-public*/ MethodHandle makeDynamicInvoker() {
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MethodHandle getTarget = GET_TARGET.bindReceiver(this);
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MethodHandle invoker = MethodHandles.exactInvoker(this.type());
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return MethodHandles.foldArguments(invoker, getTarget);
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}
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private static final MethodHandle GET_TARGET;
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static {
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try {
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GET_TARGET = IMPL_LOOKUP.
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findVirtual(CallSite.class, "getTarget", MethodType.methodType(MethodHandle.class));
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} catch (ReflectiveOperationException e) {
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throw newInternalError(e);
|
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}
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}
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jaroslav@1646
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/** This guy is rolled into the default target if a MethodType is supplied to the constructor. */
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/*package-private*/
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static Empty uninitializedCallSite() {
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throw new IllegalStateException("uninitialized call site");
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}
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/*package-private*/
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void setTargetNormal(MethodHandle newTarget) {
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MethodHandleNatives.setCallSiteTargetNormal(this, newTarget);
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}
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jaroslav@1646
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/*package-private*/
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MethodHandle getTargetVolatile() {
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jaroslav@1651
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return target;
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}
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jaroslav@1646
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/*package-private*/
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void setTargetVolatile(MethodHandle newTarget) {
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MethodHandleNatives.setCallSiteTargetVolatile(this, newTarget);
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}
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jaroslav@1646
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jaroslav@1646
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// this implements the upcall from the JVM, MethodHandleNatives.makeDynamicCallSite:
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static CallSite makeSite(MethodHandle bootstrapMethod,
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// Callee information:
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jaroslav@1646
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String name, MethodType type,
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jaroslav@1646
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// Extra arguments for BSM, if any:
|
jaroslav@1646
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253 |
Object info,
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jaroslav@1646
|
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// Caller information:
|
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Class<?> callerClass) {
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jaroslav@1646
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MethodHandles.Lookup caller = IMPL_LOOKUP.in(callerClass);
|
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|
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CallSite site;
|
jaroslav@1646
|
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try {
|
jaroslav@1646
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Object binding;
|
jaroslav@1646
|
260 |
info = maybeReBox(info);
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jaroslav@1646
|
261 |
if (info == null) {
|
jaroslav@1646
|
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binding = bootstrapMethod.invoke(caller, name, type);
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jaroslav@1646
|
263 |
} else if (!info.getClass().isArray()) {
|
jaroslav@1646
|
264 |
binding = bootstrapMethod.invoke(caller, name, type, info);
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jaroslav@1646
|
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} else {
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jaroslav@1646
|
266 |
Object[] argv = (Object[]) info;
|
jaroslav@1646
|
267 |
maybeReBoxElements(argv);
|
jaroslav@1646
|
268 |
switch (argv.length) {
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jaroslav@1646
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case 0:
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jaroslav@1646
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binding = bootstrapMethod.invoke(caller, name, type);
|
jaroslav@1646
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271 |
break;
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jaroslav@1646
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case 1:
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jaroslav@1646
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binding = bootstrapMethod.invoke(caller, name, type,
|
jaroslav@1646
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argv[0]);
|
jaroslav@1646
|
275 |
break;
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jaroslav@1646
|
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case 2:
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jaroslav@1646
|
277 |
binding = bootstrapMethod.invoke(caller, name, type,
|
jaroslav@1646
|
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argv[0], argv[1]);
|
jaroslav@1646
|
279 |
break;
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jaroslav@1646
|
280 |
case 3:
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jaroslav@1646
|
281 |
binding = bootstrapMethod.invoke(caller, name, type,
|
jaroslav@1646
|
282 |
argv[0], argv[1], argv[2]);
|
jaroslav@1646
|
283 |
break;
|
jaroslav@1646
|
284 |
case 4:
|
jaroslav@1646
|
285 |
binding = bootstrapMethod.invoke(caller, name, type,
|
jaroslav@1646
|
286 |
argv[0], argv[1], argv[2], argv[3]);
|
jaroslav@1646
|
287 |
break;
|
jaroslav@1646
|
288 |
case 5:
|
jaroslav@1646
|
289 |
binding = bootstrapMethod.invoke(caller, name, type,
|
jaroslav@1646
|
290 |
argv[0], argv[1], argv[2], argv[3], argv[4]);
|
jaroslav@1646
|
291 |
break;
|
jaroslav@1646
|
292 |
case 6:
|
jaroslav@1646
|
293 |
binding = bootstrapMethod.invoke(caller, name, type,
|
jaroslav@1646
|
294 |
argv[0], argv[1], argv[2], argv[3], argv[4], argv[5]);
|
jaroslav@1646
|
295 |
break;
|
jaroslav@1646
|
296 |
default:
|
jaroslav@1646
|
297 |
final int NON_SPREAD_ARG_COUNT = 3; // (caller, name, type)
|
jaroslav@1646
|
298 |
if (NON_SPREAD_ARG_COUNT + argv.length > MethodType.MAX_MH_ARITY)
|
jaroslav@1646
|
299 |
throw new BootstrapMethodError("too many bootstrap method arguments");
|
jaroslav@1646
|
300 |
MethodType bsmType = bootstrapMethod.type();
|
jaroslav@1646
|
301 |
MethodType invocationType = MethodType.genericMethodType(NON_SPREAD_ARG_COUNT + argv.length);
|
jaroslav@1646
|
302 |
MethodHandle typedBSM = bootstrapMethod.asType(invocationType);
|
jaroslav@1646
|
303 |
MethodHandle spreader = invocationType.invokers().spreadInvoker(NON_SPREAD_ARG_COUNT);
|
jaroslav@1646
|
304 |
binding = spreader.invokeExact(typedBSM, (Object)caller, (Object)name, (Object)type, argv);
|
jaroslav@1646
|
305 |
}
|
jaroslav@1646
|
306 |
}
|
jaroslav@1646
|
307 |
//System.out.println("BSM for "+name+type+" => "+binding);
|
jaroslav@1646
|
308 |
if (binding instanceof CallSite) {
|
jaroslav@1646
|
309 |
site = (CallSite) binding;
|
jaroslav@1646
|
310 |
} else {
|
jaroslav@1646
|
311 |
throw new ClassCastException("bootstrap method failed to produce a CallSite");
|
jaroslav@1646
|
312 |
}
|
jaroslav@1646
|
313 |
if (!site.getTarget().type().equals(type))
|
jaroslav@1646
|
314 |
throw new WrongMethodTypeException("wrong type: "+site.getTarget());
|
jaroslav@1646
|
315 |
} catch (Throwable ex) {
|
jaroslav@1646
|
316 |
BootstrapMethodError bex;
|
jaroslav@1646
|
317 |
if (ex instanceof BootstrapMethodError)
|
jaroslav@1646
|
318 |
bex = (BootstrapMethodError) ex;
|
jaroslav@1646
|
319 |
else
|
jaroslav@1646
|
320 |
bex = new BootstrapMethodError("call site initialization exception", ex);
|
jaroslav@1646
|
321 |
throw bex;
|
jaroslav@1646
|
322 |
}
|
jaroslav@1646
|
323 |
return site;
|
jaroslav@1646
|
324 |
}
|
jaroslav@1646
|
325 |
|
jaroslav@1646
|
326 |
private static Object maybeReBox(Object x) {
|
jaroslav@1646
|
327 |
if (x instanceof Integer) {
|
jaroslav@1646
|
328 |
int xi = (int) x;
|
jaroslav@1646
|
329 |
if (xi == (byte) xi)
|
jaroslav@1646
|
330 |
x = xi; // must rebox; see JLS 5.1.7
|
jaroslav@1646
|
331 |
}
|
jaroslav@1646
|
332 |
return x;
|
jaroslav@1646
|
333 |
}
|
jaroslav@1646
|
334 |
private static void maybeReBoxElements(Object[] xa) {
|
jaroslav@1646
|
335 |
for (int i = 0; i < xa.length; i++) {
|
jaroslav@1646
|
336 |
xa[i] = maybeReBox(xa[i]);
|
jaroslav@1646
|
337 |
}
|
jaroslav@1646
|
338 |
}
|
jaroslav@1646
|
339 |
}
|