author | sherman |
Tue, 30 Aug 2011 11:53:11 -0700 | |
changeset 10419 | 12c063b39232 |
parent 9752 | 88ab34b6da6d |
child 11006 | 734080358bec |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2008, 2011, 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 sun.misc.Unsafe; |
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import static java.lang.invoke.MethodHandles.Lookup.IMPL_LOOKUP; |
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|
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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><!-- see indy-demo/src/PrintArgsDemo.java --> |
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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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// Fields used only by the JVM. Do not use or change. |
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private MemberName vmmethod; // supplied by the JVM (ref. to calling method) |
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private int vmindex; // supplied by the JVM (BCI within calling method) |
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// The actual payload of this call site: |
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/*package-private*/ |
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MethodHandle target; |
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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 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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/** |
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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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/** Called from JVM (or low-level Java code) after the BSM returns the newly created CallSite. |
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* The parameters are JVM-specific. |
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*/ |
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void initializeFromJVM(String name, |
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MethodType type, |
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MemberName callerMethod, |
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int callerBCI) { |
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if (this.vmmethod != null) { |
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// FIXME |
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throw new BootstrapMethodError("call site has already been linked to an invokedynamic instruction"); |
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} |
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if (!this.type().equals(type)) { |
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throw wrongTargetType(target, type); |
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} |
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this.vmindex = callerBCI; |
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this.vmmethod = callerMethod; |
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} |
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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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/** |
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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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|
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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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|
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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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/** |
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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> |
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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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|
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/*non-public*/ MethodHandle makeDynamicInvoker() { |
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MethodHandle getTarget = MethodHandleImpl.bindReceiver(GET_TARGET, 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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|
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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 new InternalError(e); |
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} |
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} |
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|
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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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|
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// unsafe stuff: |
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private static final Unsafe unsafe = Unsafe.getUnsafe(); |
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private static final long TARGET_OFFSET; |
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|
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static { |
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try { |
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TARGET_OFFSET = unsafe.objectFieldOffset(CallSite.class.getDeclaredField("target")); |
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} catch (Exception ex) { throw new Error(ex); } |
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} |
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|
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/*package-private*/ |
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void setTargetNormal(MethodHandle newTarget) { |
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target = newTarget; |
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} |
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/*package-private*/ |
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MethodHandle getTargetVolatile() { |
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return (MethodHandle) unsafe.getObjectVolatile(this, TARGET_OFFSET); |
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} |
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/*package-private*/ |
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void setTargetVolatile(MethodHandle newTarget) { |
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unsafe.putObjectVolatile(this, TARGET_OFFSET, newTarget); |
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} |
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|
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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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String name, MethodType type, |
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// Extra arguments for BSM, if any: |
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Object info, |
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// Caller information: |
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MemberName callerMethod, int callerBCI) { |
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Class<?> callerClass = callerMethod.getDeclaringClass(); |
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Object caller = IMPL_LOOKUP.in(callerClass); |
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CallSite site; |
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try { |
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Object binding; |
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info = maybeReBox(info); |
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if (info == null) { |
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binding = bootstrapMethod.invoke(caller, name, type); |
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} else if (!info.getClass().isArray()) { |
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binding = bootstrapMethod.invoke(caller, name, type, info); |
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} else { |
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Object[] argv = (Object[]) info; |
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maybeReBoxElements(argv); |
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if (3 + argv.length > 255) |
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throw new BootstrapMethodError("too many bootstrap method arguments"); |
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MethodType bsmType = bootstrapMethod.type(); |
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if (bsmType.parameterCount() == 4 && bsmType.parameterType(3) == Object[].class) |
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binding = bootstrapMethod.invoke(caller, name, type, argv); |
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else |
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binding = MethodHandles.spreadInvoker(bsmType, 3) |
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.invoke(bootstrapMethod, caller, name, type, argv); |
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} |
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//System.out.println("BSM for "+name+type+" => "+binding); |
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if (binding instanceof CallSite) { |
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site = (CallSite) binding; |
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} else { |
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throw new ClassCastException("bootstrap method failed to produce a CallSite"); |
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} |
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if (!site.getTarget().type().equals(type)) |
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throw new WrongMethodTypeException("wrong type: "+site.getTarget()); |
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} catch (Throwable ex) { |
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BootstrapMethodError bex; |
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if (ex instanceof BootstrapMethodError) |
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bex = (BootstrapMethodError) ex; |
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else |
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bex = new BootstrapMethodError("call site initialization exception", ex); |
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throw bex; |
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325 |
} |
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return site; |
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327 |
} |
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|
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private static Object maybeReBox(Object x) { |
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330 |
if (x instanceof Integer) { |
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331 |
int xi = (int) x; |
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if (xi == (byte) xi) |
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x = xi; // must rebox; see JLS 5.1.7 |
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334 |
} |
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335 |
return x; |
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336 |
} |
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private static void maybeReBoxElements(Object[] xa) { |
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for (int i = 0; i < xa.length; i++) { |
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xa[i] = maybeReBox(xa[i]); |
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340 |
} |
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341 |
} |
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} |