jdk/src/share/classes/java/lang/invoke/MethodHandles.java
author mchung
Tue, 16 Apr 2013 21:39:52 -0700
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8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive Reviewed-by: jrose, alanb, twisti
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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 java.lang.reflect.*;
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import java.security.AccessController;
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import java.security.PrivilegedAction;
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import java.util.List;
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import java.util.ArrayList;
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import java.util.Arrays;
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import sun.invoke.util.ValueConversions;
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import sun.invoke.util.VerifyAccess;
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import sun.invoke.util.Wrapper;
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import sun.reflect.CallerSensitive;
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import sun.reflect.Reflection;
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import sun.security.util.SecurityConstants;
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import static java.lang.invoke.MethodHandleStatics.*;
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import static java.lang.invoke.MethodHandleNatives.Constants.*;
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/**
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 * This class consists exclusively of static methods that operate on or return
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 * method handles. They fall into several categories:
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 * <ul>
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 * <li>Lookup methods which help create method handles for methods and fields.
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 * <li>Combinator methods, which combine or transform pre-existing method handles into new ones.
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 * <li>Other factory methods to create method handles that emulate other common JVM operations or control flow patterns.
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 * <li>Wrapper methods which can convert between method handles and interface types.
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 * </ul>
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 * <p>
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 * @author John Rose, JSR 292 EG
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 */
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public class MethodHandles {
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    private MethodHandles() { }  // do not instantiate
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    private static final MemberName.Factory IMPL_NAMES = MemberName.getFactory();
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    static { MethodHandleImpl.initStatics(); }
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    // See IMPL_LOOKUP below.
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    //// Method handle creation from ordinary methods.
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    /**
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     * Returns a {@link Lookup lookup object} on the caller,
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     * which has the capability to access any method handle that the caller has access to,
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     * including direct method handles to private fields and methods.
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     * This lookup object is a <em>capability</em> which may be delegated to trusted agents.
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     * Do not store it in place where untrusted code can access it.
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     */
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    @CallerSensitive
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    public static Lookup lookup() {
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        return new Lookup(Reflection.getCallerClass());
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    }
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    /**
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     * Returns a {@link Lookup lookup object} which is trusted minimally.
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     * It can only be used to create method handles to
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     * publicly accessible fields and methods.
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     * <p>
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     * As a matter of pure convention, the {@linkplain Lookup#lookupClass lookup class}
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     * of this lookup object will be {@link java.lang.Object}.
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     * <p>
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     * The lookup class can be changed to any other class {@code C} using an expression of the form
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     * {@linkplain Lookup#in <code>publicLookup().in(C.class)</code>}.
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     * Since all classes have equal access to public names,
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     * such a change would confer no new access rights.
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     */
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    public static Lookup publicLookup() {
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        return Lookup.PUBLIC_LOOKUP;
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    }
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    /**
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     * A <em>lookup object</em> is a factory for creating method handles,
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     * when the creation requires access checking.
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     * Method handles do not perform
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     * access checks when they are called, but rather when they are created.
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     * Therefore, method handle access
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     * restrictions must be enforced when a method handle is created.
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     * The caller class against which those restrictions are enforced
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     * is known as the {@linkplain #lookupClass lookup class}.
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     * <p>
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     * A lookup class which needs to create method handles will call
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     * {@link MethodHandles#lookup MethodHandles.lookup} to create a factory for itself.
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     * When the {@code Lookup} factory object is created, the identity of the lookup class is
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     * determined, and securely stored in the {@code Lookup} object.
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     * The lookup class (or its delegates) may then use factory methods
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     * on the {@code Lookup} object to create method handles for access-checked members.
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     * This includes all methods, constructors, and fields which are allowed to the lookup class,
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     * even private ones.
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     * <p>
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     * The factory methods on a {@code Lookup} object correspond to all major
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     * use cases for methods, constructors, and fields.
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     * Here is a summary of the correspondence between these factory methods and
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     * the behavior the resulting method handles:
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     * <code>
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     * <table border=1 cellpadding=5 summary="lookup method behaviors">
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     * <tr><th>lookup expression</th><th>member</th><th>behavior</th></tr>
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     * <tr>
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     *     <td>{@linkplain java.lang.invoke.MethodHandles.Lookup#findGetter lookup.findGetter(C.class,"f",FT.class)}</td>
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     *     <td>FT f;</td><td>(T) this.f;</td>
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     * </tr>
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     * <tr>
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     *     <td>{@linkplain java.lang.invoke.MethodHandles.Lookup#findStaticGetter lookup.findStaticGetter(C.class,"f",FT.class)}</td>
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     *     <td>static<br>FT f;</td><td>(T) C.f;</td>
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     * </tr>
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     * <tr>
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     *     <td>{@linkplain java.lang.invoke.MethodHandles.Lookup#findSetter lookup.findSetter(C.class,"f",FT.class)}</td>
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     *     <td>FT f;</td><td>this.f = x;</td>
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     * </tr>
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     * <tr>
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     *     <td>{@linkplain java.lang.invoke.MethodHandles.Lookup#findStaticSetter lookup.findStaticSetter(C.class,"f",FT.class)}</td>
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     *     <td>static<br>FT f;</td><td>C.f = arg;</td>
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     * </tr>
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     * <tr>
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     *     <td>{@linkplain java.lang.invoke.MethodHandles.Lookup#findVirtual lookup.findVirtual(C.class,"m",MT)}</td>
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     *     <td>T m(A*);</td><td>(T) this.m(arg*);</td>
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     * </tr>
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     * <tr>
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     *     <td>{@linkplain java.lang.invoke.MethodHandles.Lookup#findStatic lookup.findStatic(C.class,"m",MT)}</td>
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     *     <td>static<br>T m(A*);</td><td>(T) C.m(arg*);</td>
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     * </tr>
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     * <tr>
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     *     <td>{@linkplain java.lang.invoke.MethodHandles.Lookup#findSpecial lookup.findSpecial(C.class,"m",MT,this.class)}</td>
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     *     <td>T m(A*);</td><td>(T) super.m(arg*);</td>
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     * </tr>
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     * <tr>
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     *     <td>{@linkplain java.lang.invoke.MethodHandles.Lookup#findConstructor lookup.findConstructor(C.class,MT)}</td>
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     *     <td>C(A*);</td><td>(T) new C(arg*);</td>
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     * </tr>
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     * <tr>
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     *     <td>{@linkplain java.lang.invoke.MethodHandles.Lookup#unreflectGetter lookup.unreflectGetter(aField)}</td>
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     *     <td>(static)?<br>FT f;</td><td>(FT) aField.get(thisOrNull);</td>
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     * </tr>
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     * <tr>
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     *     <td>{@linkplain java.lang.invoke.MethodHandles.Lookup#unreflectSetter lookup.unreflectSetter(aField)}</td>
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     *     <td>(static)?<br>FT f;</td><td>aField.set(thisOrNull, arg);</td>
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     * </tr>
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     * <tr>
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     *     <td>{@linkplain java.lang.invoke.MethodHandles.Lookup#unreflect lookup.unreflect(aMethod)}</td>
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     *     <td>(static)?<br>T m(A*);</td><td>(T) aMethod.invoke(thisOrNull, arg*);</td>
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     * </tr>
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     * <tr>
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     *     <td>{@linkplain java.lang.invoke.MethodHandles.Lookup#unreflectConstructor lookup.unreflectConstructor(aConstructor)}</td>
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     *     <td>C(A*);</td><td>(C) aConstructor.newInstance(arg*);</td>
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     * </tr>
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     * <tr>
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     *     <td>{@linkplain java.lang.invoke.MethodHandles.Lookup#unreflect lookup.unreflect(aMethod)}</td>
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     *     <td>(static)?<br>T m(A*);</td><td>(T) aMethod.invoke(thisOrNull, arg*);</td>
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     * </tr>
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     * </table>
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     * </code>
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     * Here, the type {@code C} is the class or interface being searched for a member,
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     * documented as a parameter named {@code refc} in the lookup methods.
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     * The method or constructor type {@code MT} is composed from the return type {@code T}
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     * and the sequence of argument types {@code A*}.
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     * Both {@code MT} and the field type {@code FT} are documented as a parameter named {@code type}.
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     * The formal parameter {@code this} stands for the self-reference of type {@code C};
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     * if it is present, it is always the leading argument to the method handle invocation.
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     * (In the case of some {@code protected} members, {@code this} may be
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     * restricted in type to the lookup class; see below.)
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     * The name {@code arg} stands for all the other method handle arguments.
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     * In the code examples for the Core Reflection API, the name {@code thisOrNull}
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     * stands for a null reference if the accessed method or field is static,
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     * and {@code this} otherwise.
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     * The names {@code aMethod}, {@code aField}, and {@code aConstructor} stand
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     * for reflective objects corresponding to the given members.
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     * <p>
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     * In cases where the given member is of variable arity (i.e., a method or constructor)
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     * the returned method handle will also be of {@linkplain MethodHandle#asVarargsCollector variable arity}.
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     * In all other cases, the returned method handle will be of fixed arity.
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     * <p>
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     * The equivalence between looked-up method handles and underlying
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     * class members can break down in a few ways:
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     * <ul>
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     * <li>If {@code C} is not symbolically accessible from the lookup class's loader,
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     * the lookup can still succeed, even when there is no equivalent
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     * Java expression or bytecoded constant.
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     * <li>Likewise, if {@code T} or {@code MT}
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     * is not symbolically accessible from the lookup class's loader,
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     * the lookup can still succeed.
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     * For example, lookups for {@code MethodHandle.invokeExact} and
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     * {@code MethodHandle.invoke} will always succeed, regardless of requested type.
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     * <li>If there is a security manager installed, it can forbid the lookup
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     * on various grounds (<a href="#secmgr">see below</a>).
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     * By contrast, the {@code ldc} instruction is not subject to
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     * security manager checks.
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     * </ul>
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     *
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     * <h3><a name="access"></a>Access checking</h3>
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     * Access checks are applied in the factory methods of {@code Lookup},
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     * when a method handle is created.
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     * This is a key difference from the Core Reflection API, since
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     * {@link java.lang.reflect.Method#invoke java.lang.reflect.Method.invoke}
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     * performs access checking against every caller, on every call.
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     * <p>
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     * All access checks start from a {@code Lookup} object, which
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     * compares its recorded lookup class against all requests to
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     * create method handles.
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     * A single {@code Lookup} object can be used to create any number
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     * of access-checked method handles, all checked against a single
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     * lookup class.
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     * <p>
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     * A {@code Lookup} object can be shared with other trusted code,
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     * such as a metaobject protocol.
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     * A shared {@code Lookup} object delegates the capability
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     * to create method handles on private members of the lookup class.
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     * Even if privileged code uses the {@code Lookup} object,
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     * the access checking is confined to the privileges of the
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     * original lookup class.
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     * <p>
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     * A lookup can fail, because
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     * the containing class is not accessible to the lookup class, or
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     * because the desired class member is missing, or because the
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     * desired class member is not accessible to the lookup class.
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     * In any of these cases, a {@code ReflectiveOperationException} will be
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     * thrown from the attempted lookup.  The exact class will be one of
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     * the following:
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     * <ul>
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     * <li>NoSuchMethodException &mdash; if a method is requested but does not exist
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     * <li>NoSuchFieldException &mdash; if a field is requested but does not exist
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     * <li>IllegalAccessException &mdash; if the member exists but an access check fails
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     * </ul>
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     * <p>
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     * In general, the conditions under which a method handle may be
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     * looked up for a method {@code M} are exactly equivalent to the conditions
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     * under which the lookup class could have compiled and resolved a call to {@code M}.
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     * And the effect of invoking the method handle resulting from the lookup
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     * is exactly equivalent to executing the compiled and resolved call to {@code M}.
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     * The same point is true of fields and constructors.
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     * <p>
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     * If the desired member is {@code protected}, the usual JVM rules apply,
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     * including the requirement that the lookup class must be either be in the
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     * same package as the desired member, or must inherit that member.
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     * (See the Java Virtual Machine Specification, sections 4.9.2, 5.4.3.5, and 6.4.)
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     * In addition, if the desired member is a non-static field or method
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     * in a different package, the resulting method handle may only be applied
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     * to objects of the lookup class or one of its subclasses.
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     * This requirement is enforced by narrowing the type of the leading
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     * {@code this} parameter from {@code C}
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     * (which will necessarily be a superclass of the lookup class)
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     * to the lookup class itself.
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     * <p>
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     * In some cases, access between nested classes is obtained by the Java compiler by creating
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     * an wrapper method to access a private method of another class
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     * in the same top-level declaration.
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     * For example, a nested class {@code C.D}
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     * can access private members within other related classes such as
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     * {@code C}, {@code C.D.E}, or {@code C.B},
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     * but the Java compiler may need to generate wrapper methods in
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     * those related classes.  In such cases, a {@code Lookup} object on
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     * {@code C.E} would be unable to those private members.
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     * A workaround for this limitation is the {@link Lookup#in Lookup.in} method,
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     * which can transform a lookup on {@code C.E} into one on any of those other
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     * classes, without special elevation of privilege.
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     * <p>
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     * Although bytecode instructions can only refer to classes in
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     * a related class loader, this API can search for methods in any
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     * class, as long as a reference to its {@code Class} object is
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     * available.  Such cross-loader references are also possible with the
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     * Core Reflection API, and are impossible to bytecode instructions
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     * such as {@code invokestatic} or {@code getfield}.
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     * There is a {@linkplain java.lang.SecurityManager security manager API}
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     * to allow applications to check such cross-loader references.
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     * These checks apply to both the {@code MethodHandles.Lookup} API
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     * and the Core Reflection API
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     * (as found on {@link java.lang.Class Class}).
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     * <p>
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     * Access checks only apply to named and reflected methods,
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     * constructors, and fields.
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     * Other method handle creation methods, such as
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     * {@link MethodHandle#asType MethodHandle.asType},
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     * do not require any access checks, and are done
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     * with static methods of {@link MethodHandles},
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     * independently of any {@code Lookup} object.
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     *
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     * <h3>Security manager interactions</h3>
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     * <a name="secmgr"></a>
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     * If a security manager is present, member lookups are subject to
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     * additional checks.
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     * From one to four calls are made to the security manager.
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     * Any of these calls can refuse access by throwing a
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     * {@link java.lang.SecurityException SecurityException}.
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     * Define {@code smgr} as the security manager,
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     * {@code refc} as the containing class in which the member
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     * is being sought, and {@code defc} as the class in which the
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     * member is actually defined.
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     * The calls are made according to the following rules:
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     * <ul>
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     * <li>In all cases, {@link SecurityManager#checkMemberAccess
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     *     smgr.checkMemberAccess(refc, Member.PUBLIC)} is called.
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     * <li>If the class loader of the lookup class is not
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     *     the same as or an ancestor of the class loader of {@code refc},
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     *     then {@link SecurityManager#checkPackageAccess
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     *     smgr.checkPackageAccess(refcPkg)} is called,
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     *     where {@code refcPkg} is the package of {@code refc}.
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     * <li>If the retrieved member is not public,
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     *     {@link SecurityManager#checkMemberAccess
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     *     smgr.checkMemberAccess(defc, Member.DECLARED)} is called.
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     *     (Note that {@code defc} might be the same as {@code refc}.)
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     *     The default implementation of this security manager method
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     *     inspects the stack to determine the original caller of
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     *     the reflective request (such as {@code findStatic}),
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     *     and performs additional permission checks if the
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     *     class loader of {@code defc} differs from the class
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     *     loader of the class from which the reflective request came.
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     * <li>If the retrieved member is not public,
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     *     and if {@code defc} and {@code refc} are in different class loaders,
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     *     and if the class loader of the lookup class is not
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     *     the same as or an ancestor of the class loader of {@code defc},
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     *     then {@link SecurityManager#checkPackageAccess
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     *     smgr.checkPackageAccess(defcPkg)} is called,
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     *     where {@code defcPkg} is the package of {@code defc}.
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     * </ul>
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     */
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    // FIXME in MR1: clarify that the bytecode behavior of a caller-ID method (like Class.forName) is relative to the lookupClass used to create the method handle, not the dynamic caller of the method handle
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    public static final
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    class Lookup {
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        /** The class on behalf of whom the lookup is being performed. */
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        private final Class<?> lookupClass;
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        /** The allowed sorts of members which may be looked up (PUBLIC, etc.). */
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        private final int allowedModes;
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        /** A single-bit mask representing {@code public} access,
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         *  which may contribute to the result of {@link #lookupModes lookupModes}.
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         *  The value, {@code 0x01}, happens to be the same as the value of the
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         *  {@code public} {@linkplain java.lang.reflect.Modifier#PUBLIC modifier bit}.
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         */
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        public static final int PUBLIC = Modifier.PUBLIC;
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        /** A single-bit mask representing {@code private} access,
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         *  which may contribute to the result of {@link #lookupModes lookupModes}.
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         *  The value, {@code 0x02}, happens to be the same as the value of the
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         *  {@code private} {@linkplain java.lang.reflect.Modifier#PRIVATE modifier bit}.
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         */
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        public static final int PRIVATE = Modifier.PRIVATE;
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        /** A single-bit mask representing {@code protected} access,
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         *  which may contribute to the result of {@link #lookupModes lookupModes}.
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         *  The value, {@code 0x04}, happens to be the same as the value of the
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         *  {@code protected} {@linkplain java.lang.reflect.Modifier#PROTECTED modifier bit}.
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         */
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        public static final int PROTECTED = Modifier.PROTECTED;
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        /** A single-bit mask representing {@code package} access (default access),
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         *  which may contribute to the result of {@link #lookupModes lookupModes}.
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         *  The value is {@code 0x08}, which does not correspond meaningfully to
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         *  any particular {@linkplain java.lang.reflect.Modifier modifier bit}.
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         */
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        public static final int PACKAGE = Modifier.STATIC;
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        private static final int ALL_MODES = (PUBLIC | PRIVATE | PROTECTED | PACKAGE);
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        private static final int TRUSTED   = -1;
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        private static int fixmods(int mods) {
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            mods &= (ALL_MODES - PACKAGE);
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            return (mods != 0) ? mods : PACKAGE;
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        }
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        /** Tells which class is performing the lookup.  It is this class against
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         *  which checks are performed for visibility and access permissions.
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         *  <p>
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         *  The class implies a maximum level of access permission,
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         *  but the permissions may be additionally limited by the bitmask
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         *  {@link #lookupModes lookupModes}, which controls whether non-public members
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         *  can be accessed.
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         */
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        public Class<?> lookupClass() {
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   391
            return lookupClass;
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        }
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        // This is just for calling out to MethodHandleImpl.
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   395
        private Class<?> lookupClassOrNull() {
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   396
            return (allowedModes == TRUSTED) ? null : lookupClass;
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   397
        }
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        /** Tells which access-protection classes of members this lookup object can produce.
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         *  The result is a bit-mask of the bits
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         *  {@linkplain #PUBLIC PUBLIC (0x01)},
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   402
         *  {@linkplain #PRIVATE PRIVATE (0x02)},
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   403
         *  {@linkplain #PROTECTED PROTECTED (0x04)},
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   404
         *  and {@linkplain #PACKAGE PACKAGE (0x08)}.
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   405
         *  <p>
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         *  A freshly-created lookup object
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         *  on the {@linkplain java.lang.invoke.MethodHandles#lookup() caller's class}
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         *  has all possible bits set, since the caller class can access all its own members.
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         *  A lookup object on a new lookup class
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         *  {@linkplain java.lang.invoke.MethodHandles.Lookup#in created from a previous lookup object}
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   411
         *  may have some mode bits set to zero.
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         *  The purpose of this is to restrict access via the new lookup object,
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diff changeset
   413
         *  so that it can access only names which can be reached by the original
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
   414
         *  lookup object, and also by the new lookup class.
5722
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   415
         */
7052
963a5baf2ba3 6980096: JSR 292 reflective lookup should throw checked exceptions
jrose
parents: 5727
diff changeset
   416
        public int lookupModes() {
5722
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   417
            return allowedModes & ALL_MODES;
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   418
        }
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   419
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   420
        /** Embody the current class (the lookupClass) as a lookup class
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   421
         * for method handle creation.
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   422
         * Must be called by from a method in this package,
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   423
         * which in turn is called by a method not in this package.
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   424
         */
16906
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
   425
        Lookup(Class<?> lookupClass) {
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
   426
            this(lookupClass, ALL_MODES);
5722
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   427
            // make sure we haven't accidentally picked up a privileged class:
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   428
            checkUnprivilegedlookupClass(lookupClass);
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
   429
        }
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
   430
5722
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   431
        private Lookup(Class<?> lookupClass, int allowedModes) {
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
   432
            this.lookupClass = lookupClass;
5722
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   433
            this.allowedModes = allowedModes;
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
   434
        }
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
   435
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
   436
        /**
8346
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
   437
         * Creates a lookup on the specified new lookup class.
5722
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   438
         * The resulting object will report the specified
7562
a0ad195efe2c 7001424: implement JSR 292 EG adjustments, November 2010
jrose
parents: 7555
diff changeset
   439
         * class as its own {@link #lookupClass lookupClass}.
5722
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   440
         * <p>
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   441
         * However, the resulting {@code Lookup} object is guaranteed
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   442
         * to have no more access capabilities than the original.
7555
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
   443
         * In particular, access capabilities can be lost as follows:<ul>
5722
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   444
         * <li>If the new lookup class differs from the old one,
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   445
         * protected members will not be accessible by virtue of inheritance.
7555
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
   446
         * (Protected members may continue to be accessible because of package sharing.)
5722
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   447
         * <li>If the new lookup class is in a different package
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   448
         * than the old one, protected and default (package) members will not be accessible.
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   449
         * <li>If the new lookup class is not within the same package member
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   450
         * as the old one, private members will not be accessible.
7555
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
   451
         * <li>If the new lookup class is not accessible to the old lookup class,
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
   452
         * then no members, not even public members, will be accessible.
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
   453
         * (In all other cases, public members will continue to be accessible.)
5722
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   454
         * </ul>
8346
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
   455
         *
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
   456
         * @param requestedLookupClass the desired lookup class for the new lookup object
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
   457
         * @return a lookup object which reports the desired lookup class
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
   458
         * @throws NullPointerException if the argument is null
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
   459
         */
5722
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   460
        public Lookup in(Class<?> requestedLookupClass) {
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   461
            requestedLookupClass.getClass();  // null check
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   462
            if (allowedModes == TRUSTED)  // IMPL_LOOKUP can make any lookup at all
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   463
                return new Lookup(requestedLookupClass, ALL_MODES);
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   464
            if (requestedLookupClass == this.lookupClass)
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   465
                return this;  // keep same capabilities
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   466
            int newModes = (allowedModes & (ALL_MODES & ~PROTECTED));
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   467
            if ((newModes & PACKAGE) != 0
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   468
                && !VerifyAccess.isSamePackage(this.lookupClass, requestedLookupClass)) {
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   469
                newModes &= ~(PACKAGE|PRIVATE);
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
   470
            }
7555
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
   471
            // Allow nestmate lookups to be created without special privilege:
5722
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   472
            if ((newModes & PRIVATE) != 0
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   473
                && !VerifyAccess.isSamePackageMember(this.lookupClass, requestedLookupClass)) {
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   474
                newModes &= ~PRIVATE;
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   475
            }
13044
8411854afc2b 7165628: Issues with java.lang.invoke.MethodHandles.Lookup
jrose
parents: 11535
diff changeset
   476
            if ((newModes & PUBLIC) != 0
8411854afc2b 7165628: Issues with java.lang.invoke.MethodHandles.Lookup
jrose
parents: 11535
diff changeset
   477
                && !VerifyAccess.isClassAccessible(requestedLookupClass, this.lookupClass, allowedModes)) {
7555
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
   478
                // The requested class it not accessible from the lookup class.
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
   479
                // No permissions.
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
   480
                newModes = 0;
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
   481
            }
5722
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   482
            checkUnprivilegedlookupClass(requestedLookupClass);
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   483
            return new Lookup(requestedLookupClass, newModes);
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   484
        }
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   485
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
   486
        // Make sure outer class is initialized first.
8821
2836ee97ee27 6839872: remove implementation inheritance from JSR 292 APIs
jrose
parents: 8349
diff changeset
   487
        static { IMPL_NAMES.getClass(); }
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
   488
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   489
        /** Version of lookup which is trusted minimally.
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   490
         *  It can only be used to create method handles to
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   491
         *  publicly accessible members.
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   492
         */
5722
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   493
        static final Lookup PUBLIC_LOOKUP = new Lookup(Object.class, PUBLIC);
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   494
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   495
        /** Package-private version of lookup which is trusted. */
5722
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   496
        static final Lookup IMPL_LOOKUP = new Lookup(Object.class, TRUSTED);
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   497
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   498
        private static void checkUnprivilegedlookupClass(Class<?> lookupClass) {
2764
2e45af54c0f9 6839839: access checking logic is wrong at three points in MethodHandles
jrose
parents: 2763
diff changeset
   499
            String name = lookupClass.getName();
8822
8145ab9f5f86 7012648: move JSR 292 to package java.lang.invoke and adjust names
jrose
parents: 8821
diff changeset
   500
            if (name.startsWith("java.lang.invoke."))
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   501
                throw newIllegalArgumentException("illegal lookupClass: "+lookupClass);
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   502
        }
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   503
7562
a0ad195efe2c 7001424: implement JSR 292 EG adjustments, November 2010
jrose
parents: 7555
diff changeset
   504
        /**
8346
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
   505
         * Displays the name of the class from which lookups are to be made.
7562
a0ad195efe2c 7001424: implement JSR 292 EG adjustments, November 2010
jrose
parents: 7555
diff changeset
   506
         * (The name is the one reported by {@link java.lang.Class#getName() Class.getName}.)
a0ad195efe2c 7001424: implement JSR 292 EG adjustments, November 2010
jrose
parents: 7555
diff changeset
   507
         * If there are restrictions on the access permitted to this lookup,
a0ad195efe2c 7001424: implement JSR 292 EG adjustments, November 2010
jrose
parents: 7555
diff changeset
   508
         * this is indicated by adding a suffix to the class name, consisting
8346
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
   509
         * of a slash and a keyword.  The keyword represents the strongest
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
   510
         * allowed access, and is chosen as follows:
7562
a0ad195efe2c 7001424: implement JSR 292 EG adjustments, November 2010
jrose
parents: 7555
diff changeset
   511
         * <ul>
a0ad195efe2c 7001424: implement JSR 292 EG adjustments, November 2010
jrose
parents: 7555
diff changeset
   512
         * <li>If no access is allowed, the suffix is "/noaccess".
a0ad195efe2c 7001424: implement JSR 292 EG adjustments, November 2010
jrose
parents: 7555
diff changeset
   513
         * <li>If only public access is allowed, the suffix is "/public".
a0ad195efe2c 7001424: implement JSR 292 EG adjustments, November 2010
jrose
parents: 7555
diff changeset
   514
         * <li>If only public and package access are allowed, the suffix is "/package".
a0ad195efe2c 7001424: implement JSR 292 EG adjustments, November 2010
jrose
parents: 7555
diff changeset
   515
         * <li>If only public, package, and private access are allowed, the suffix is "/private".
a0ad195efe2c 7001424: implement JSR 292 EG adjustments, November 2010
jrose
parents: 7555
diff changeset
   516
         * </ul>
a0ad195efe2c 7001424: implement JSR 292 EG adjustments, November 2010
jrose
parents: 7555
diff changeset
   517
         * If none of the above cases apply, it is the case that full
a0ad195efe2c 7001424: implement JSR 292 EG adjustments, November 2010
jrose
parents: 7555
diff changeset
   518
         * access (public, package, private, and protected) is allowed.
a0ad195efe2c 7001424: implement JSR 292 EG adjustments, November 2010
jrose
parents: 7555
diff changeset
   519
         * In this case, no suffix is added.
a0ad195efe2c 7001424: implement JSR 292 EG adjustments, November 2010
jrose
parents: 7555
diff changeset
   520
         * This is true only of an object obtained originally from
8822
8145ab9f5f86 7012648: move JSR 292 to package java.lang.invoke and adjust names
jrose
parents: 8821
diff changeset
   521
         * {@link java.lang.invoke.MethodHandles#lookup MethodHandles.lookup}.
8145ab9f5f86 7012648: move JSR 292 to package java.lang.invoke and adjust names
jrose
parents: 8821
diff changeset
   522
         * Objects created by {@link java.lang.invoke.MethodHandles.Lookup#in Lookup.in}
7562
a0ad195efe2c 7001424: implement JSR 292 EG adjustments, November 2010
jrose
parents: 7555
diff changeset
   523
         * always have restricted access, and will display a suffix.
8346
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
   524
         * <p>
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
   525
         * (It may seem strange that protected access should be
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
   526
         * stronger than private access.  Viewed independently from
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
   527
         * package access, protected access is the first to be lost,
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
   528
         * because it requires a direct subclass relationship between
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
   529
         * caller and callee.)
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
   530
         * @see #in
5722
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   531
         */
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   532
        @Override
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   533
        public String toString() {
5722
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   534
            String cname = lookupClass.getName();
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   535
            switch (allowedModes) {
8346
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
   536
            case 0:  // no privileges
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
   537
                return cname + "/noaccess";
5722
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   538
            case PUBLIC:
7562
a0ad195efe2c 7001424: implement JSR 292 EG adjustments, November 2010
jrose
parents: 7555
diff changeset
   539
                return cname + "/public";
5722
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   540
            case PUBLIC|PACKAGE:
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   541
                return cname + "/package";
8346
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
   542
            case ALL_MODES & ~PROTECTED:
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
   543
                return cname + "/private";
5722
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   544
            case ALL_MODES:
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   545
                return cname;
8346
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
   546
            case TRUSTED:
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
   547
                return "/trusted";  // internal only; not exported
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
   548
            default:  // Should not happen, but it's a bitfield...
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
   549
                cname = cname + "/" + Integer.toHexString(allowedModes);
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
   550
                assert(false) : cname;
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
   551
                return cname;
5722
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   552
            }
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   553
        }
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   554
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   555
        /**
8346
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
   556
         * Produces a method handle for a static method.
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   557
         * The type of the method handle will be that of the method.
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
   558
         * (Since static methods do not take receivers, there is no
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
   559
         * additional receiver argument inserted into the method handle type,
8346
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
   560
         * as there would be with {@link #findVirtual findVirtual} or {@link #findSpecial findSpecial}.)
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   561
         * The method and all its argument types must be accessible to the lookup class.
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   562
         * If the method's class has not yet been initialized, that is done
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   563
         * immediately, before the method handle is returned.
8345
9e2483e6cfab 7013417: JSR 292 needs to support variadic method handle calls
jrose
parents: 7562
diff changeset
   564
         * <p>
9e2483e6cfab 7013417: JSR 292 needs to support variadic method handle calls
jrose
parents: 7562
diff changeset
   565
         * The returned method handle will have
9e2483e6cfab 7013417: JSR 292 needs to support variadic method handle calls
jrose
parents: 7562
diff changeset
   566
         * {@linkplain MethodHandle#asVarargsCollector variable arity} if and only if
9e2483e6cfab 7013417: JSR 292 needs to support variadic method handle calls
jrose
parents: 7562
diff changeset
   567
         * the method's variable arity modifier bit ({@code 0x0080}) is set.
5722
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   568
         * @param refc the class from which the method is accessed
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   569
         * @param name the name of the method
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   570
         * @param type the type of the method
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   571
         * @return the desired method handle
8347
e5daa5772ffd 7013730: JSR 292 reflective operations should report errors with standard exception types
jrose
parents: 8346
diff changeset
   572
         * @throws NoSuchMethodException if the method does not exist
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
   573
         * @throws IllegalAccessException if access checking fails,
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
   574
         *                                or if the method is not {@code static},
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
   575
         *                                or if the method's variable arity modifier bit
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
   576
         *                                is set and {@code asVarargsCollector} fails
8349
e1ba54c43609 7014755: JSR 292 member lookup interaction with security manager
jrose
parents: 8347
diff changeset
   577
         * @exception SecurityException if a security manager is present and it
e1ba54c43609 7014755: JSR 292 member lookup interaction with security manager
jrose
parents: 8347
diff changeset
   578
         *                              <a href="MethodHandles.Lookup.html#secmgr">refuses access</a>
8347
e5daa5772ffd 7013730: JSR 292 reflective operations should report errors with standard exception types
jrose
parents: 8346
diff changeset
   579
         * @throws NullPointerException if any argument is null
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   580
         */
16906
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
   581
        @CallerSensitive
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   582
        public
8347
e5daa5772ffd 7013730: JSR 292 reflective operations should report errors with standard exception types
jrose
parents: 8346
diff changeset
   583
        MethodHandle findStatic(Class<?> refc, String name, MethodType type) throws NoSuchMethodException, IllegalAccessException {
13423
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
   584
            MemberName method = resolveOrFail(REF_invokeStatic, refc, name, type);
16906
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
   585
            Class<?> callerClass = Reflection.getCallerClass();
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
   586
            checkSecurityManager(refc, method, callerClass);
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
   587
            return getDirectMethod(REF_invokeStatic, refc, method,
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
   588
                                   findBoundCallerClass(method, callerClass));
9780
6fc3b49cfee4 7050328: (jsr-292) findConstructor throws ExceptionInInitializerError if run under SecurityManager
jrose
parents: 9752
diff changeset
   589
        }
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   590
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   591
        /**
8346
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
   592
         * Produces a method handle for a virtual method.
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   593
         * The type of the method handle will be that of the method,
5722
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   594
         * with the receiver type (usually {@code refc}) prepended.
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   595
         * The method and all its argument types must be accessible to the lookup class.
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   596
         * <p>
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   597
         * When called, the handle will treat the first argument as a receiver
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   598
         * and dispatch on the receiver's type to determine which method
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   599
         * implementation to enter.
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   600
         * (The dispatching action is identical with that performed by an
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   601
         * {@code invokevirtual} or {@code invokeinterface} instruction.)
8345
9e2483e6cfab 7013417: JSR 292 needs to support variadic method handle calls
jrose
parents: 7562
diff changeset
   602
         * <p>
13423
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
   603
         * The first argument will be of type {@code refc} if the lookup
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
   604
         * class has full privileges to access the member.  Otherwise
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
   605
         * the member must be {@code protected} and the first argument
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
   606
         * will be restricted in type to the lookup class.
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
   607
         * <p>
8345
9e2483e6cfab 7013417: JSR 292 needs to support variadic method handle calls
jrose
parents: 7562
diff changeset
   608
         * The returned method handle will have
9e2483e6cfab 7013417: JSR 292 needs to support variadic method handle calls
jrose
parents: 7562
diff changeset
   609
         * {@linkplain MethodHandle#asVarargsCollector variable arity} if and only if
9e2483e6cfab 7013417: JSR 292 needs to support variadic method handle calls
jrose
parents: 7562
diff changeset
   610
         * the method's variable arity modifier bit ({@code 0x0080}) is set.
8346
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
   611
         * <p>
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
   612
         * Because of the general equivalence between {@code invokevirtual}
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
   613
         * instructions and method handles produced by {@code findVirtual},
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
   614
         * if the class is {@code MethodHandle} and the name string is
9645
dabb5e4edc4c 7034977: JSR 292 MethodHandle.invokeGeneric should be renamed MethodHandle.invoke
jrose
parents: 8822
diff changeset
   615
         * {@code invokeExact} or {@code invoke}, the resulting
8346
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
   616
         * method handle is equivalent to one produced by
8822
8145ab9f5f86 7012648: move JSR 292 to package java.lang.invoke and adjust names
jrose
parents: 8821
diff changeset
   617
         * {@link java.lang.invoke.MethodHandles#exactInvoker MethodHandles.exactInvoker} or
9645
dabb5e4edc4c 7034977: JSR 292 MethodHandle.invokeGeneric should be renamed MethodHandle.invoke
jrose
parents: 8822
diff changeset
   618
         * {@link java.lang.invoke.MethodHandles#invoker MethodHandles.invoker}
8346
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
   619
         * with the same {@code type} argument.
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
   620
         *
5722
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   621
         * @param refc the class or interface from which the method is accessed
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   622
         * @param name the name of the method
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   623
         * @param type the type of the method, with the receiver argument omitted
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   624
         * @return the desired method handle
8347
e5daa5772ffd 7013730: JSR 292 reflective operations should report errors with standard exception types
jrose
parents: 8346
diff changeset
   625
         * @throws NoSuchMethodException if the method does not exist
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
   626
         * @throws IllegalAccessException if access checking fails,
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
   627
         *                                or if the method is {@code static}
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
   628
         *                                or if the method's variable arity modifier bit
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
   629
         *                                is set and {@code asVarargsCollector} fails
8349
e1ba54c43609 7014755: JSR 292 member lookup interaction with security manager
jrose
parents: 8347
diff changeset
   630
         * @exception SecurityException if a security manager is present and it
e1ba54c43609 7014755: JSR 292 member lookup interaction with security manager
jrose
parents: 8347
diff changeset
   631
         *                              <a href="MethodHandles.Lookup.html#secmgr">refuses access</a>
8347
e5daa5772ffd 7013730: JSR 292 reflective operations should report errors with standard exception types
jrose
parents: 8346
diff changeset
   632
         * @throws NullPointerException if any argument is null
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   633
         */
16906
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
   634
        @CallerSensitive
8347
e5daa5772ffd 7013730: JSR 292 reflective operations should report errors with standard exception types
jrose
parents: 8346
diff changeset
   635
        public MethodHandle findVirtual(Class<?> refc, String name, MethodType type) throws NoSuchMethodException, IllegalAccessException {
13423
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
   636
            if (refc == MethodHandle.class) {
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
   637
                MethodHandle mh = findVirtualForMH(name, type);
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
   638
                if (mh != null)  return mh;
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
   639
            }
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
   640
            byte refKind = (refc.isInterface() ? REF_invokeInterface : REF_invokeVirtual);
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
   641
            MemberName method = resolveOrFail(refKind, refc, name, type);
16906
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
   642
            Class<?> callerClass = Reflection.getCallerClass();
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
   643
            checkSecurityManager(refc, method, callerClass);
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
   644
            return getDirectMethod(refKind, refc, method,
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
   645
                                   findBoundCallerClass(method, callerClass));
9780
6fc3b49cfee4 7050328: (jsr-292) findConstructor throws ExceptionInInitializerError if run under SecurityManager
jrose
parents: 9752
diff changeset
   646
        }
13423
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
   647
        private MethodHandle findVirtualForMH(String name, MethodType type) {
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
   648
            // these names require special lookups because of the implicit MethodType argument
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
   649
            if ("invoke".equals(name))
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
   650
                return invoker(type);
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
   651
            if ("invokeExact".equals(name))
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
   652
                return exactInvoker(type);
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
   653
            return null;
5722
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   654
        }
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   655
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   656
        /**
8346
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
   657
         * Produces a method handle which creates an object and initializes it, using
5722
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   658
         * the constructor of the specified type.
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   659
         * The parameter types of the method handle will be those of the constructor,
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   660
         * while the return type will be a reference to the constructor's class.
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   661
         * The constructor and all its argument types must be accessible to the lookup class.
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   662
         * If the constructor's class has not yet been initialized, that is done
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   663
         * immediately, before the method handle is returned.
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   664
         * <p>
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   665
         * Note:  The requested type must have a return type of {@code void}.
8346
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
   666
         * This is consistent with the JVM's treatment of constructor type descriptors.
8345
9e2483e6cfab 7013417: JSR 292 needs to support variadic method handle calls
jrose
parents: 7562
diff changeset
   667
         * <p>
9e2483e6cfab 7013417: JSR 292 needs to support variadic method handle calls
jrose
parents: 7562
diff changeset
   668
         * The returned method handle will have
9e2483e6cfab 7013417: JSR 292 needs to support variadic method handle calls
jrose
parents: 7562
diff changeset
   669
         * {@linkplain MethodHandle#asVarargsCollector variable arity} if and only if
9e2483e6cfab 7013417: JSR 292 needs to support variadic method handle calls
jrose
parents: 7562
diff changeset
   670
         * the constructor's variable arity modifier bit ({@code 0x0080}) is set.
5722
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   671
         * @param refc the class or interface from which the method is accessed
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   672
         * @param type the type of the method, with the receiver argument omitted, and a void return type
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   673
         * @return the desired method handle
8347
e5daa5772ffd 7013730: JSR 292 reflective operations should report errors with standard exception types
jrose
parents: 8346
diff changeset
   674
         * @throws NoSuchMethodException if the constructor does not exist
e5daa5772ffd 7013730: JSR 292 reflective operations should report errors with standard exception types
jrose
parents: 8346
diff changeset
   675
         * @throws IllegalAccessException if access checking fails
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
   676
         *                                or if the method's variable arity modifier bit
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
   677
         *                                is set and {@code asVarargsCollector} fails
8349
e1ba54c43609 7014755: JSR 292 member lookup interaction with security manager
jrose
parents: 8347
diff changeset
   678
         * @exception SecurityException if a security manager is present and it
e1ba54c43609 7014755: JSR 292 member lookup interaction with security manager
jrose
parents: 8347
diff changeset
   679
         *                              <a href="MethodHandles.Lookup.html#secmgr">refuses access</a>
8347
e5daa5772ffd 7013730: JSR 292 reflective operations should report errors with standard exception types
jrose
parents: 8346
diff changeset
   680
         * @throws NullPointerException if any argument is null
5722
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   681
         */
16906
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
   682
        @CallerSensitive
8347
e5daa5772ffd 7013730: JSR 292 reflective operations should report errors with standard exception types
jrose
parents: 8346
diff changeset
   683
        public MethodHandle findConstructor(Class<?> refc, MethodType type) throws NoSuchMethodException, IllegalAccessException {
5722
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   684
            String name = "<init>";
13423
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
   685
            MemberName ctor = resolveOrFail(REF_newInvokeSpecial, refc, name, type);
16906
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
   686
            checkSecurityManager(refc, ctor, Reflection.getCallerClass());
13423
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
   687
            return getDirectConstructor(refc, ctor);
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   688
        }
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   689
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   690
        /**
8346
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
   691
         * Produces an early-bound method handle for a virtual method,
2763
172d44ffd1e5 6839802: java.dyn needs to be on the CORE_PKGS list
jrose
parents: 2707
diff changeset
   692
         * as if called from an {@code invokespecial}
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   693
         * instruction from {@code caller}.
2763
172d44ffd1e5 6839802: java.dyn needs to be on the CORE_PKGS list
jrose
parents: 2707
diff changeset
   694
         * The type of the method handle will be that of the method,
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   695
         * with a suitably restricted receiver type (such as {@code caller}) prepended.
2763
172d44ffd1e5 6839802: java.dyn needs to be on the CORE_PKGS list
jrose
parents: 2707
diff changeset
   696
         * The method and all its argument types must be accessible
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   697
         * to the caller.
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   698
         * <p>
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   699
         * When called, the handle will treat the first argument as a receiver,
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   700
         * but will not dispatch on the receiver's type.
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   701
         * (This direct invocation action is identical with that performed by an
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   702
         * {@code invokespecial} instruction.)
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   703
         * <p>
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   704
         * If the explicitly specified caller class is not identical with the
7555
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
   705
         * lookup class, or if this lookup object does not have private access
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
   706
         * privileges, the access fails.
8345
9e2483e6cfab 7013417: JSR 292 needs to support variadic method handle calls
jrose
parents: 7562
diff changeset
   707
         * <p>
9e2483e6cfab 7013417: JSR 292 needs to support variadic method handle calls
jrose
parents: 7562
diff changeset
   708
         * The returned method handle will have
9e2483e6cfab 7013417: JSR 292 needs to support variadic method handle calls
jrose
parents: 7562
diff changeset
   709
         * {@linkplain MethodHandle#asVarargsCollector variable arity} if and only if
9e2483e6cfab 7013417: JSR 292 needs to support variadic method handle calls
jrose
parents: 7562
diff changeset
   710
         * the method's variable arity modifier bit ({@code 0x0080}) is set.
5722
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   711
         * @param refc the class or interface from which the method is accessed
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   712
         * @param name the name of the method (which must not be "&lt;init&gt;")
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   713
         * @param type the type of the method, with the receiver argument omitted
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   714
         * @param specialCaller the proposed calling class to perform the {@code invokespecial}
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   715
         * @return the desired method handle
8347
e5daa5772ffd 7013730: JSR 292 reflective operations should report errors with standard exception types
jrose
parents: 8346
diff changeset
   716
         * @throws NoSuchMethodException if the method does not exist
e5daa5772ffd 7013730: JSR 292 reflective operations should report errors with standard exception types
jrose
parents: 8346
diff changeset
   717
         * @throws IllegalAccessException if access checking fails
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
   718
         *                                or if the method's variable arity modifier bit
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
   719
         *                                is set and {@code asVarargsCollector} fails
8349
e1ba54c43609 7014755: JSR 292 member lookup interaction with security manager
jrose
parents: 8347
diff changeset
   720
         * @exception SecurityException if a security manager is present and it
e1ba54c43609 7014755: JSR 292 member lookup interaction with security manager
jrose
parents: 8347
diff changeset
   721
         *                              <a href="MethodHandles.Lookup.html#secmgr">refuses access</a>
8347
e5daa5772ffd 7013730: JSR 292 reflective operations should report errors with standard exception types
jrose
parents: 8346
diff changeset
   722
         * @throws NullPointerException if any argument is null
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   723
         */
16906
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
   724
        @CallerSensitive
5722
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   725
        public MethodHandle findSpecial(Class<?> refc, String name, MethodType type,
8347
e5daa5772ffd 7013730: JSR 292 reflective operations should report errors with standard exception types
jrose
parents: 8346
diff changeset
   726
                                        Class<?> specialCaller) throws NoSuchMethodException, IllegalAccessException {
5722
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   727
            checkSpecialCaller(specialCaller);
13423
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
   728
            Lookup specialLookup = this.in(specialCaller);
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
   729
            MemberName method = specialLookup.resolveOrFail(REF_invokeSpecial, refc, name, type);
16906
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
   730
            Class<?> callerClass = Reflection.getCallerClass();
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
   731
            checkSecurityManager(refc, method, callerClass);
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
   732
            return specialLookup.getDirectMethod(REF_invokeSpecial, refc, method,
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
   733
                                                 findBoundCallerClass(method, callerClass));
9780
6fc3b49cfee4 7050328: (jsr-292) findConstructor throws ExceptionInInitializerError if run under SecurityManager
jrose
parents: 9752
diff changeset
   734
        }
5722
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   735
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   736
        /**
8346
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
   737
         * Produces a method handle giving read access to a non-static field.
5722
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   738
         * The type of the method handle will have a return type of the field's
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   739
         * value type.
5726
72c9d793224b 6939203: JSR 292 needs method handle constants
jrose
parents: 5722
diff changeset
   740
         * The method handle's single argument will be the instance containing
5722
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   741
         * the field.
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   742
         * Access checking is performed immediately on behalf of the lookup class.
8346
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
   743
         * @param refc the class or interface from which the method is accessed
5722
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   744
         * @param name the field's name
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   745
         * @param type the field's type
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   746
         * @return a method handle which can load values from the field
8347
e5daa5772ffd 7013730: JSR 292 reflective operations should report errors with standard exception types
jrose
parents: 8346
diff changeset
   747
         * @throws NoSuchFieldException if the field does not exist
e5daa5772ffd 7013730: JSR 292 reflective operations should report errors with standard exception types
jrose
parents: 8346
diff changeset
   748
         * @throws IllegalAccessException if access checking fails, or if the field is {@code static}
8349
e1ba54c43609 7014755: JSR 292 member lookup interaction with security manager
jrose
parents: 8347
diff changeset
   749
         * @exception SecurityException if a security manager is present and it
e1ba54c43609 7014755: JSR 292 member lookup interaction with security manager
jrose
parents: 8347
diff changeset
   750
         *                              <a href="MethodHandles.Lookup.html#secmgr">refuses access</a>
8347
e5daa5772ffd 7013730: JSR 292 reflective operations should report errors with standard exception types
jrose
parents: 8346
diff changeset
   751
         * @throws NullPointerException if any argument is null
5722
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   752
         */
16906
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
   753
        @CallerSensitive
8347
e5daa5772ffd 7013730: JSR 292 reflective operations should report errors with standard exception types
jrose
parents: 8346
diff changeset
   754
        public MethodHandle findGetter(Class<?> refc, String name, Class<?> type) throws NoSuchFieldException, IllegalAccessException {
13423
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
   755
            MemberName field = resolveOrFail(REF_getField, refc, name, type);
16906
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
   756
            checkSecurityManager(refc, field, Reflection.getCallerClass());
13423
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
   757
            return getDirectField(REF_getField, refc, field);
9780
6fc3b49cfee4 7050328: (jsr-292) findConstructor throws ExceptionInInitializerError if run under SecurityManager
jrose
parents: 9752
diff changeset
   758
        }
5726
72c9d793224b 6939203: JSR 292 needs method handle constants
jrose
parents: 5722
diff changeset
   759
72c9d793224b 6939203: JSR 292 needs method handle constants
jrose
parents: 5722
diff changeset
   760
        /**
8346
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
   761
         * Produces a method handle giving write access to a non-static field.
5726
72c9d793224b 6939203: JSR 292 needs method handle constants
jrose
parents: 5722
diff changeset
   762
         * The type of the method handle will have a void return type.
72c9d793224b 6939203: JSR 292 needs method handle constants
jrose
parents: 5722
diff changeset
   763
         * The method handle will take two arguments, the instance containing
72c9d793224b 6939203: JSR 292 needs method handle constants
jrose
parents: 5722
diff changeset
   764
         * the field, and the value to be stored.
72c9d793224b 6939203: JSR 292 needs method handle constants
jrose
parents: 5722
diff changeset
   765
         * The second argument will be of the field's value type.
72c9d793224b 6939203: JSR 292 needs method handle constants
jrose
parents: 5722
diff changeset
   766
         * Access checking is performed immediately on behalf of the lookup class.
8346
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
   767
         * @param refc the class or interface from which the method is accessed
5726
72c9d793224b 6939203: JSR 292 needs method handle constants
jrose
parents: 5722
diff changeset
   768
         * @param name the field's name
72c9d793224b 6939203: JSR 292 needs method handle constants
jrose
parents: 5722
diff changeset
   769
         * @param type the field's type
72c9d793224b 6939203: JSR 292 needs method handle constants
jrose
parents: 5722
diff changeset
   770
         * @return a method handle which can store values into the field
8347
e5daa5772ffd 7013730: JSR 292 reflective operations should report errors with standard exception types
jrose
parents: 8346
diff changeset
   771
         * @throws NoSuchFieldException if the field does not exist
e5daa5772ffd 7013730: JSR 292 reflective operations should report errors with standard exception types
jrose
parents: 8346
diff changeset
   772
         * @throws IllegalAccessException if access checking fails, or if the field is {@code static}
8349
e1ba54c43609 7014755: JSR 292 member lookup interaction with security manager
jrose
parents: 8347
diff changeset
   773
         * @exception SecurityException if a security manager is present and it
e1ba54c43609 7014755: JSR 292 member lookup interaction with security manager
jrose
parents: 8347
diff changeset
   774
         *                              <a href="MethodHandles.Lookup.html#secmgr">refuses access</a>
8347
e5daa5772ffd 7013730: JSR 292 reflective operations should report errors with standard exception types
jrose
parents: 8346
diff changeset
   775
         * @throws NullPointerException if any argument is null
5726
72c9d793224b 6939203: JSR 292 needs method handle constants
jrose
parents: 5722
diff changeset
   776
         */
16906
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
   777
        @CallerSensitive
8347
e5daa5772ffd 7013730: JSR 292 reflective operations should report errors with standard exception types
jrose
parents: 8346
diff changeset
   778
        public MethodHandle findSetter(Class<?> refc, String name, Class<?> type) throws NoSuchFieldException, IllegalAccessException {
13423
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
   779
            MemberName field = resolveOrFail(REF_putField, refc, name, type);
16906
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
   780
            checkSecurityManager(refc, field, Reflection.getCallerClass());
13423
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
   781
            return getDirectField(REF_putField, refc, field);
9780
6fc3b49cfee4 7050328: (jsr-292) findConstructor throws ExceptionInInitializerError if run under SecurityManager
jrose
parents: 9752
diff changeset
   782
        }
5722
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   783
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   784
        /**
8346
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
   785
         * Produces a method handle giving read access to a static field.
5726
72c9d793224b 6939203: JSR 292 needs method handle constants
jrose
parents: 5722
diff changeset
   786
         * The type of the method handle will have a return type of the field's
72c9d793224b 6939203: JSR 292 needs method handle constants
jrose
parents: 5722
diff changeset
   787
         * value type.
72c9d793224b 6939203: JSR 292 needs method handle constants
jrose
parents: 5722
diff changeset
   788
         * The method handle will take no arguments.
5722
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   789
         * Access checking is performed immediately on behalf of the lookup class.
8346
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
   790
         * @param refc the class or interface from which the method is accessed
5722
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   791
         * @param name the field's name
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   792
         * @param type the field's type
5726
72c9d793224b 6939203: JSR 292 needs method handle constants
jrose
parents: 5722
diff changeset
   793
         * @return a method handle which can load values from the field
8347
e5daa5772ffd 7013730: JSR 292 reflective operations should report errors with standard exception types
jrose
parents: 8346
diff changeset
   794
         * @throws NoSuchFieldException if the field does not exist
e5daa5772ffd 7013730: JSR 292 reflective operations should report errors with standard exception types
jrose
parents: 8346
diff changeset
   795
         * @throws IllegalAccessException if access checking fails, or if the field is not {@code static}
8349
e1ba54c43609 7014755: JSR 292 member lookup interaction with security manager
jrose
parents: 8347
diff changeset
   796
         * @exception SecurityException if a security manager is present and it
e1ba54c43609 7014755: JSR 292 member lookup interaction with security manager
jrose
parents: 8347
diff changeset
   797
         *                              <a href="MethodHandles.Lookup.html#secmgr">refuses access</a>
8347
e5daa5772ffd 7013730: JSR 292 reflective operations should report errors with standard exception types
jrose
parents: 8346
diff changeset
   798
         * @throws NullPointerException if any argument is null
5722
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   799
         */
16906
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
   800
        @CallerSensitive
8347
e5daa5772ffd 7013730: JSR 292 reflective operations should report errors with standard exception types
jrose
parents: 8346
diff changeset
   801
        public MethodHandle findStaticGetter(Class<?> refc, String name, Class<?> type) throws NoSuchFieldException, IllegalAccessException {
13423
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
   802
            MemberName field = resolveOrFail(REF_getStatic, refc, name, type);
16906
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
   803
            checkSecurityManager(refc, field, Reflection.getCallerClass());
13423
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
   804
            return getDirectField(REF_getStatic, refc, field);
9780
6fc3b49cfee4 7050328: (jsr-292) findConstructor throws ExceptionInInitializerError if run under SecurityManager
jrose
parents: 9752
diff changeset
   805
        }
5726
72c9d793224b 6939203: JSR 292 needs method handle constants
jrose
parents: 5722
diff changeset
   806
72c9d793224b 6939203: JSR 292 needs method handle constants
jrose
parents: 5722
diff changeset
   807
        /**
8346
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
   808
         * Produces a method handle giving write access to a static field.
5726
72c9d793224b 6939203: JSR 292 needs method handle constants
jrose
parents: 5722
diff changeset
   809
         * The type of the method handle will have a void return type.
72c9d793224b 6939203: JSR 292 needs method handle constants
jrose
parents: 5722
diff changeset
   810
         * The method handle will take a single
72c9d793224b 6939203: JSR 292 needs method handle constants
jrose
parents: 5722
diff changeset
   811
         * argument, of the field's value type, the value to be stored.
72c9d793224b 6939203: JSR 292 needs method handle constants
jrose
parents: 5722
diff changeset
   812
         * Access checking is performed immediately on behalf of the lookup class.
8346
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
   813
         * @param refc the class or interface from which the method is accessed
5726
72c9d793224b 6939203: JSR 292 needs method handle constants
jrose
parents: 5722
diff changeset
   814
         * @param name the field's name
72c9d793224b 6939203: JSR 292 needs method handle constants
jrose
parents: 5722
diff changeset
   815
         * @param type the field's type
72c9d793224b 6939203: JSR 292 needs method handle constants
jrose
parents: 5722
diff changeset
   816
         * @return a method handle which can store values into the field
8347
e5daa5772ffd 7013730: JSR 292 reflective operations should report errors with standard exception types
jrose
parents: 8346
diff changeset
   817
         * @throws NoSuchFieldException if the field does not exist
e5daa5772ffd 7013730: JSR 292 reflective operations should report errors with standard exception types
jrose
parents: 8346
diff changeset
   818
         * @throws IllegalAccessException if access checking fails, or if the field is not {@code static}
8349
e1ba54c43609 7014755: JSR 292 member lookup interaction with security manager
jrose
parents: 8347
diff changeset
   819
         * @exception SecurityException if a security manager is present and it
e1ba54c43609 7014755: JSR 292 member lookup interaction with security manager
jrose
parents: 8347
diff changeset
   820
         *                              <a href="MethodHandles.Lookup.html#secmgr">refuses access</a>
8347
e5daa5772ffd 7013730: JSR 292 reflective operations should report errors with standard exception types
jrose
parents: 8346
diff changeset
   821
         * @throws NullPointerException if any argument is null
5726
72c9d793224b 6939203: JSR 292 needs method handle constants
jrose
parents: 5722
diff changeset
   822
         */
16906
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
   823
        @CallerSensitive
8347
e5daa5772ffd 7013730: JSR 292 reflective operations should report errors with standard exception types
jrose
parents: 8346
diff changeset
   824
        public MethodHandle findStaticSetter(Class<?> refc, String name, Class<?> type) throws NoSuchFieldException, IllegalAccessException {
13423
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
   825
            MemberName field = resolveOrFail(REF_putStatic, refc, name, type);
16906
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
   826
            checkSecurityManager(refc, field, Reflection.getCallerClass());
13423
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
   827
            return getDirectField(REF_putStatic, refc, field);
9780
6fc3b49cfee4 7050328: (jsr-292) findConstructor throws ExceptionInInitializerError if run under SecurityManager
jrose
parents: 9752
diff changeset
   828
        }
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   829
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   830
        /**
8346
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
   831
         * Produces an early-bound method handle for a non-static method.
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   832
         * The receiver must have a supertype {@code defc} in which a method
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   833
         * of the given name and type is accessible to the lookup class.
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   834
         * The method and all its argument types must be accessible to the lookup class.
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
   835
         * The type of the method handle will be that of the method,
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
   836
         * without any insertion of an additional receiver parameter.
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
   837
         * The given receiver will be bound into the method handle,
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
   838
         * so that every call to the method handle will invoke the
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
   839
         * requested method on the given receiver.
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   840
         * <p>
8345
9e2483e6cfab 7013417: JSR 292 needs to support variadic method handle calls
jrose
parents: 7562
diff changeset
   841
         * The returned method handle will have
9e2483e6cfab 7013417: JSR 292 needs to support variadic method handle calls
jrose
parents: 7562
diff changeset
   842
         * {@linkplain MethodHandle#asVarargsCollector variable arity} if and only if
9e2483e6cfab 7013417: JSR 292 needs to support variadic method handle calls
jrose
parents: 7562
diff changeset
   843
         * the method's variable arity modifier bit ({@code 0x0080}) is set
9e2483e6cfab 7013417: JSR 292 needs to support variadic method handle calls
jrose
parents: 7562
diff changeset
   844
         * <em>and</em> the trailing array argument is not the only argument.
9e2483e6cfab 7013417: JSR 292 needs to support variadic method handle calls
jrose
parents: 7562
diff changeset
   845
         * (If the trailing array argument is the only argument,
9e2483e6cfab 7013417: JSR 292 needs to support variadic method handle calls
jrose
parents: 7562
diff changeset
   846
         * the given receiver value will be bound to it.)
9e2483e6cfab 7013417: JSR 292 needs to support variadic method handle calls
jrose
parents: 7562
diff changeset
   847
         * <p>
9e2483e6cfab 7013417: JSR 292 needs to support variadic method handle calls
jrose
parents: 7562
diff changeset
   848
         * This is equivalent to the following code:
9e2483e6cfab 7013417: JSR 292 needs to support variadic method handle calls
jrose
parents: 7562
diff changeset
   849
         * <blockquote><pre>
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
   850
import static java.lang.invoke.MethodHandles.*;
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
   851
import static java.lang.invoke.MethodType.*;
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
   852
...
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
   853
MethodHandle mh0 = lookup().{@link #findVirtual findVirtual}(defc, name, type);
8345
9e2483e6cfab 7013417: JSR 292 needs to support variadic method handle calls
jrose
parents: 7562
diff changeset
   854
MethodHandle mh1 = mh0.{@link MethodHandle#bindTo bindTo}(receiver);
9e2483e6cfab 7013417: JSR 292 needs to support variadic method handle calls
jrose
parents: 7562
diff changeset
   855
MethodType mt1 = mh1.type();
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
   856
if (mh0.isVarargsCollector())
8345
9e2483e6cfab 7013417: JSR 292 needs to support variadic method handle calls
jrose
parents: 7562
diff changeset
   857
  mh1 = mh1.asVarargsCollector(mt1.parameterType(mt1.parameterCount()-1));
9e2483e6cfab 7013417: JSR 292 needs to support variadic method handle calls
jrose
parents: 7562
diff changeset
   858
return mh1;
9e2483e6cfab 7013417: JSR 292 needs to support variadic method handle calls
jrose
parents: 7562
diff changeset
   859
         * </pre></blockquote>
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
   860
         * where {@code defc} is either {@code receiver.getClass()} or a super
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
   861
         * type of that class, in which the requested method is accessible
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
   862
         * to the lookup class.
8345
9e2483e6cfab 7013417: JSR 292 needs to support variadic method handle calls
jrose
parents: 7562
diff changeset
   863
         * (Note that {@code bindTo} does not preserve variable arity.)
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   864
         * @param receiver the object from which the method is accessed
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   865
         * @param name the name of the method
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   866
         * @param type the type of the method, with the receiver argument omitted
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   867
         * @return the desired method handle
8347
e5daa5772ffd 7013730: JSR 292 reflective operations should report errors with standard exception types
jrose
parents: 8346
diff changeset
   868
         * @throws NoSuchMethodException if the method does not exist
e5daa5772ffd 7013730: JSR 292 reflective operations should report errors with standard exception types
jrose
parents: 8346
diff changeset
   869
         * @throws IllegalAccessException if access checking fails
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
   870
         *                                or if the method's variable arity modifier bit
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
   871
         *                                is set and {@code asVarargsCollector} fails
8349
e1ba54c43609 7014755: JSR 292 member lookup interaction with security manager
jrose
parents: 8347
diff changeset
   872
         * @exception SecurityException if a security manager is present and it
e1ba54c43609 7014755: JSR 292 member lookup interaction with security manager
jrose
parents: 8347
diff changeset
   873
         *                              <a href="MethodHandles.Lookup.html#secmgr">refuses access</a>
8347
e5daa5772ffd 7013730: JSR 292 reflective operations should report errors with standard exception types
jrose
parents: 8346
diff changeset
   874
         * @throws NullPointerException if any argument is null
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   875
         */
16906
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
   876
        @CallerSensitive
8347
e5daa5772ffd 7013730: JSR 292 reflective operations should report errors with standard exception types
jrose
parents: 8346
diff changeset
   877
        public MethodHandle bind(Object receiver, String name, MethodType type) throws NoSuchMethodException, IllegalAccessException {
5722
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   878
            Class<? extends Object> refc = receiver.getClass(); // may get NPE
13423
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
   879
            MemberName method = resolveOrFail(REF_invokeSpecial, refc, name, type);
16906
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
   880
            Class<?> callerClass = Reflection.getCallerClass();
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
   881
            checkSecurityManager(refc, method, callerClass);
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
   882
            MethodHandle mh = getDirectMethodNoRestrict(REF_invokeSpecial, refc, method,
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
   883
                                                        findBoundCallerClass(method, callerClass));
13423
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
   884
            return mh.bindReceiver(receiver).setVarargs(method);
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   885
        }
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   886
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   887
        /**
8822
8145ab9f5f86 7012648: move JSR 292 to package java.lang.invoke and adjust names
jrose
parents: 8821
diff changeset
   888
         * Makes a direct method handle to <i>m</i>, if the lookup class has permission.
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   889
         * If <i>m</i> is non-static, the receiver argument is treated as an initial argument.
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   890
         * If <i>m</i> is virtual, overriding is respected on every call.
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   891
         * Unlike the Core Reflection API, exceptions are <em>not</em> wrapped.
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   892
         * The type of the method handle will be that of the method,
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   893
         * with the receiver type prepended (but only if it is non-static).
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   894
         * If the method's {@code accessible} flag is not set,
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   895
         * access checking is performed immediately on behalf of the lookup class.
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   896
         * If <i>m</i> is not public, do not share the resulting handle with untrusted parties.
8345
9e2483e6cfab 7013417: JSR 292 needs to support variadic method handle calls
jrose
parents: 7562
diff changeset
   897
         * <p>
9e2483e6cfab 7013417: JSR 292 needs to support variadic method handle calls
jrose
parents: 7562
diff changeset
   898
         * The returned method handle will have
9e2483e6cfab 7013417: JSR 292 needs to support variadic method handle calls
jrose
parents: 7562
diff changeset
   899
         * {@linkplain MethodHandle#asVarargsCollector variable arity} if and only if
9e2483e6cfab 7013417: JSR 292 needs to support variadic method handle calls
jrose
parents: 7562
diff changeset
   900
         * the method's variable arity modifier bit ({@code 0x0080}) is set.
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   901
         * @param m the reflected method
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   902
         * @return a method handle which can invoke the reflected method
8347
e5daa5772ffd 7013730: JSR 292 reflective operations should report errors with standard exception types
jrose
parents: 8346
diff changeset
   903
         * @throws IllegalAccessException if access checking fails
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
   904
         *                                or if the method's variable arity modifier bit
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
   905
         *                                is set and {@code asVarargsCollector} fails
8347
e5daa5772ffd 7013730: JSR 292 reflective operations should report errors with standard exception types
jrose
parents: 8346
diff changeset
   906
         * @throws NullPointerException if the argument is null
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   907
         */
16906
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
   908
        @CallerSensitive
8347
e5daa5772ffd 7013730: JSR 292 reflective operations should report errors with standard exception types
jrose
parents: 8346
diff changeset
   909
        public MethodHandle unreflect(Method m) throws IllegalAccessException {
5722
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   910
            MemberName method = new MemberName(m);
13423
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
   911
            byte refKind = method.getReferenceKind();
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
   912
            if (refKind == REF_invokeSpecial)
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
   913
                refKind = REF_invokeVirtual;
5722
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   914
            assert(method.isMethod());
16906
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
   915
            Class<?> callerClass = findBoundCallerClass(method, Reflection.getCallerClass());
13423
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
   916
            Lookup lookup = m.isAccessible() ? IMPL_LOOKUP : this;
16118
9f3390f42157 8006439: Improve MethodHandles coverage
vlivanov
parents: 14222
diff changeset
   917
            return lookup.getDirectMethod(refKind, method.getDeclaringClass(), method, callerClass);
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   918
        }
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   919
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   920
        /**
8346
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
   921
         * Produces a method handle for a reflected method.
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   922
         * It will bypass checks for overriding methods on the receiver,
5722
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   923
         * as if by a {@code invokespecial} instruction from within the {@code specialCaller}.
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   924
         * The type of the method handle will be that of the method,
5722
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   925
         * with the special caller type prepended (and <em>not</em> the receiver of the method).
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   926
         * If the method's {@code accessible} flag is not set,
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   927
         * access checking is performed immediately on behalf of the lookup class,
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   928
         * as if {@code invokespecial} instruction were being linked.
8345
9e2483e6cfab 7013417: JSR 292 needs to support variadic method handle calls
jrose
parents: 7562
diff changeset
   929
         * <p>
9e2483e6cfab 7013417: JSR 292 needs to support variadic method handle calls
jrose
parents: 7562
diff changeset
   930
         * The returned method handle will have
9e2483e6cfab 7013417: JSR 292 needs to support variadic method handle calls
jrose
parents: 7562
diff changeset
   931
         * {@linkplain MethodHandle#asVarargsCollector variable arity} if and only if
9e2483e6cfab 7013417: JSR 292 needs to support variadic method handle calls
jrose
parents: 7562
diff changeset
   932
         * the method's variable arity modifier bit ({@code 0x0080}) is set.
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   933
         * @param m the reflected method
5722
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   934
         * @param specialCaller the class nominally calling the method
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   935
         * @return a method handle which can invoke the reflected method
8347
e5daa5772ffd 7013730: JSR 292 reflective operations should report errors with standard exception types
jrose
parents: 8346
diff changeset
   936
         * @throws IllegalAccessException if access checking fails
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
   937
         *                                or if the method's variable arity modifier bit
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
   938
         *                                is set and {@code asVarargsCollector} fails
8347
e5daa5772ffd 7013730: JSR 292 reflective operations should report errors with standard exception types
jrose
parents: 8346
diff changeset
   939
         * @throws NullPointerException if any argument is null
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   940
         */
16906
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
   941
        @CallerSensitive
8347
e5daa5772ffd 7013730: JSR 292 reflective operations should report errors with standard exception types
jrose
parents: 8346
diff changeset
   942
        public MethodHandle unreflectSpecial(Method m, Class<?> specialCaller) throws IllegalAccessException {
5722
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   943
            checkSpecialCaller(specialCaller);
13423
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
   944
            Lookup specialLookup = this.in(specialCaller);
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
   945
            MemberName method = new MemberName(m, true);
5722
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   946
            assert(method.isMethod());
16906
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
   947
            Class<?> callerClass = findBoundCallerClass(method, Reflection.getCallerClass());
5722
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   948
            // ignore m.isAccessible:  this is a new kind of access
16118
9f3390f42157 8006439: Improve MethodHandles coverage
vlivanov
parents: 14222
diff changeset
   949
            return specialLookup.getDirectMethod(REF_invokeSpecial, method.getDeclaringClass(), method, callerClass);
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   950
        }
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   951
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   952
        /**
8346
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
   953
         * Produces a method handle for a reflected constructor.
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
   954
         * The type of the method handle will be that of the constructor,
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
   955
         * with the return type changed to the declaring class.
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   956
         * The method handle will perform a {@code newInstance} operation,
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   957
         * creating a new instance of the constructor's class on the
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   958
         * arguments passed to the method handle.
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   959
         * <p>
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   960
         * If the constructor's {@code accessible} flag is not set,
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
   961
         * access checking is performed immediately on behalf of the lookup class.
8345
9e2483e6cfab 7013417: JSR 292 needs to support variadic method handle calls
jrose
parents: 7562
diff changeset
   962
         * <p>
9e2483e6cfab 7013417: JSR 292 needs to support variadic method handle calls
jrose
parents: 7562
diff changeset
   963
         * The returned method handle will have
9e2483e6cfab 7013417: JSR 292 needs to support variadic method handle calls
jrose
parents: 7562
diff changeset
   964
         * {@linkplain MethodHandle#asVarargsCollector variable arity} if and only if
9e2483e6cfab 7013417: JSR 292 needs to support variadic method handle calls
jrose
parents: 7562
diff changeset
   965
         * the constructor's variable arity modifier bit ({@code 0x0080}) is set.
5722
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   966
         * @param c the reflected constructor
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   967
         * @return a method handle which can invoke the reflected constructor
8347
e5daa5772ffd 7013730: JSR 292 reflective operations should report errors with standard exception types
jrose
parents: 8346
diff changeset
   968
         * @throws IllegalAccessException if access checking fails
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
   969
         *                                or if the method's variable arity modifier bit
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
   970
         *                                is set and {@code asVarargsCollector} fails
8347
e5daa5772ffd 7013730: JSR 292 reflective operations should report errors with standard exception types
jrose
parents: 8346
diff changeset
   971
         * @throws NullPointerException if the argument is null
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   972
         */
11534
9949ffb8eb3a 7117167: Misc warnings in java.lang.invoke and sun.invoke.*
jrose
parents: 10082
diff changeset
   973
        @SuppressWarnings("rawtypes")  // Will be Constructor<?> after JSR 292 MR
8347
e5daa5772ffd 7013730: JSR 292 reflective operations should report errors with standard exception types
jrose
parents: 8346
diff changeset
   974
        public MethodHandle unreflectConstructor(Constructor c) throws IllegalAccessException {
5722
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   975
            MemberName ctor = new MemberName(c);
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
   976
            assert(ctor.isConstructor());
13423
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
   977
            Lookup lookup = c.isAccessible() ? IMPL_LOOKUP : this;
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
   978
            return lookup.getDirectConstructor(ctor.getDeclaringClass(), ctor);
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   979
        }
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   980
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   981
        /**
8346
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
   982
         * Produces a method handle giving read access to a reflected field.
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   983
         * The type of the method handle will have a return type of the field's
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
   984
         * value type.
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
   985
         * If the field is static, the method handle will take no arguments.
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
   986
         * Otherwise, its single argument will be the instance containing
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
   987
         * the field.
8822
8145ab9f5f86 7012648: move JSR 292 to package java.lang.invoke and adjust names
jrose
parents: 8821
diff changeset
   988
         * If the field's {@code accessible} flag is not set,
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   989
         * access checking is performed immediately on behalf of the lookup class.
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   990
         * @param f the reflected field
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   991
         * @return a method handle which can load values from the reflected field
8347
e5daa5772ffd 7013730: JSR 292 reflective operations should report errors with standard exception types
jrose
parents: 8346
diff changeset
   992
         * @throws IllegalAccessException if access checking fails
e5daa5772ffd 7013730: JSR 292 reflective operations should report errors with standard exception types
jrose
parents: 8346
diff changeset
   993
         * @throws NullPointerException if the argument is null
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
   994
         */
8347
e5daa5772ffd 7013730: JSR 292 reflective operations should report errors with standard exception types
jrose
parents: 8346
diff changeset
   995
        public MethodHandle unreflectGetter(Field f) throws IllegalAccessException {
13423
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
   996
            return unreflectField(f, false);
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
   997
        }
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
   998
        private MethodHandle unreflectField(Field f, boolean isSetter) throws IllegalAccessException {
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
   999
            MemberName field = new MemberName(f, isSetter);
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1000
            assert(isSetter
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1001
                    ? MethodHandleNatives.refKindIsSetter(field.getReferenceKind())
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1002
                    : MethodHandleNatives.refKindIsGetter(field.getReferenceKind()));
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1003
            Lookup lookup = f.isAccessible() ? IMPL_LOOKUP : this;
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1004
            return lookup.getDirectField(field.getReferenceKind(), f.getDeclaringClass(), field);
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1005
        }
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1006
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1007
        /**
8346
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1008
         * Produces a method handle giving write access to a reflected field.
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1009
         * The type of the method handle will have a void return type.
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1010
         * If the field is static, the method handle will take a single
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1011
         * argument, of the field's value type, the value to be stored.
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1012
         * Otherwise, the two arguments will be the instance containing
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1013
         * the field, and the value to be stored.
8822
8145ab9f5f86 7012648: move JSR 292 to package java.lang.invoke and adjust names
jrose
parents: 8821
diff changeset
  1014
         * If the field's {@code accessible} flag is not set,
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1015
         * access checking is performed immediately on behalf of the lookup class.
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1016
         * @param f the reflected field
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1017
         * @return a method handle which can store values into the reflected field
8347
e5daa5772ffd 7013730: JSR 292 reflective operations should report errors with standard exception types
jrose
parents: 8346
diff changeset
  1018
         * @throws IllegalAccessException if access checking fails
e5daa5772ffd 7013730: JSR 292 reflective operations should report errors with standard exception types
jrose
parents: 8346
diff changeset
  1019
         * @throws NullPointerException if the argument is null
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1020
         */
8347
e5daa5772ffd 7013730: JSR 292 reflective operations should report errors with standard exception types
jrose
parents: 8346
diff changeset
  1021
        public MethodHandle unreflectSetter(Field f) throws IllegalAccessException {
13423
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1022
            return unreflectField(f, true);
5722
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
  1023
        }
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
  1024
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
  1025
        /// Helper methods, all package-private.
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
  1026
13423
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1027
        MemberName resolveOrFail(byte refKind, Class<?> refc, String name, Class<?> type) throws NoSuchFieldException, IllegalAccessException {
5722
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
  1028
            checkSymbolicClass(refc);  // do this before attempting to resolve
8347
e5daa5772ffd 7013730: JSR 292 reflective operations should report errors with standard exception types
jrose
parents: 8346
diff changeset
  1029
            name.getClass(); type.getClass();  // NPE
13423
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1030
            return IMPL_NAMES.resolveOrFail(refKind, new MemberName(refc, name, type, refKind), lookupClassOrNull(),
8347
e5daa5772ffd 7013730: JSR 292 reflective operations should report errors with standard exception types
jrose
parents: 8346
diff changeset
  1031
                                            NoSuchFieldException.class);
5722
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
  1032
        }
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
  1033
13423
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1034
        MemberName resolveOrFail(byte refKind, Class<?> refc, String name, MethodType type) throws NoSuchMethodException, IllegalAccessException {
5722
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
  1035
            checkSymbolicClass(refc);  // do this before attempting to resolve
8347
e5daa5772ffd 7013730: JSR 292 reflective operations should report errors with standard exception types
jrose
parents: 8346
diff changeset
  1036
            name.getClass(); type.getClass();  // NPE
13423
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1037
            return IMPL_NAMES.resolveOrFail(refKind, new MemberName(refc, name, type, refKind), lookupClassOrNull(),
8347
e5daa5772ffd 7013730: JSR 292 reflective operations should report errors with standard exception types
jrose
parents: 8346
diff changeset
  1038
                                            NoSuchMethodException.class);
5722
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
  1039
        }
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
  1040
8347
e5daa5772ffd 7013730: JSR 292 reflective operations should report errors with standard exception types
jrose
parents: 8346
diff changeset
  1041
        void checkSymbolicClass(Class<?> refc) throws IllegalAccessException {
5722
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
  1042
            Class<?> caller = lookupClassOrNull();
13044
8411854afc2b 7165628: Issues with java.lang.invoke.MethodHandles.Lookup
jrose
parents: 11535
diff changeset
  1043
            if (caller != null && !VerifyAccess.isClassAccessible(refc, caller, allowedModes))
8821
2836ee97ee27 6839872: remove implementation inheritance from JSR 292 APIs
jrose
parents: 8349
diff changeset
  1044
                throw new MemberName(refc).makeAccessException("symbolic reference class is not public", this);
5722
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
  1045
        }
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
  1046
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1047
        /**
16118
9f3390f42157 8006439: Improve MethodHandles coverage
vlivanov
parents: 14222
diff changeset
  1048
         * Find my trustable caller class if m is a caller sensitive method.
9f3390f42157 8006439: Improve MethodHandles coverage
vlivanov
parents: 14222
diff changeset
  1049
         * If this lookup object has private access, then the caller class is the lookupClass.
9f3390f42157 8006439: Improve MethodHandles coverage
vlivanov
parents: 14222
diff changeset
  1050
         * Otherwise, it is the caller of the currently executing public API method (e.g., findVirtual).
9f3390f42157 8006439: Improve MethodHandles coverage
vlivanov
parents: 14222
diff changeset
  1051
         * This is the same caller class as is used by checkSecurityManager.
9f3390f42157 8006439: Improve MethodHandles coverage
vlivanov
parents: 14222
diff changeset
  1052
         */
16906
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
  1053
        Class<?> findBoundCallerClass(MemberName m, Class<?> callerAtEntryPoint) {
16118
9f3390f42157 8006439: Improve MethodHandles coverage
vlivanov
parents: 14222
diff changeset
  1054
            Class<?> callerClass = null;
9f3390f42157 8006439: Improve MethodHandles coverage
vlivanov
parents: 14222
diff changeset
  1055
            if (MethodHandleNatives.isCallerSensitive(m)) {
9f3390f42157 8006439: Improve MethodHandles coverage
vlivanov
parents: 14222
diff changeset
  1056
                // Do not refactor this to a more "logical" place, since it is stack walk magic.
9f3390f42157 8006439: Improve MethodHandles coverage
vlivanov
parents: 14222
diff changeset
  1057
                // Note that this is the same expression as in Step 2 below in checkSecurityManager.
9f3390f42157 8006439: Improve MethodHandles coverage
vlivanov
parents: 14222
diff changeset
  1058
                callerClass = ((allowedModes & PRIVATE) != 0
9f3390f42157 8006439: Improve MethodHandles coverage
vlivanov
parents: 14222
diff changeset
  1059
                               ? lookupClass  // for strong access modes, no extra check
16906
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
  1060
                               : callerAtEntryPoint);
16118
9f3390f42157 8006439: Improve MethodHandles coverage
vlivanov
parents: 14222
diff changeset
  1061
            }
9f3390f42157 8006439: Improve MethodHandles coverage
vlivanov
parents: 14222
diff changeset
  1062
            return callerClass;
9f3390f42157 8006439: Improve MethodHandles coverage
vlivanov
parents: 14222
diff changeset
  1063
        }
16906
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
  1064
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
  1065
        /**
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
  1066
         * Determine whether a security manager has an overridden
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
  1067
         * SecurityManager.checkMemberAccess method.
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
  1068
         */
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
  1069
        private boolean isCheckMemberAccessOverridden(SecurityManager sm) {
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
  1070
            final Class<? extends SecurityManager> cls = sm.getClass();
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
  1071
            if (cls == SecurityManager.class) return false;
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
  1072
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
  1073
            try {
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
  1074
                return cls.getMethod("checkMemberAccess", Class.class, int.class).
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
  1075
                    getDeclaringClass() != SecurityManager.class;
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
  1076
            } catch (NoSuchMethodException e) {
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
  1077
                throw new InternalError("should not reach here");
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
  1078
            }
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
  1079
        }
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
  1080
16118
9f3390f42157 8006439: Improve MethodHandles coverage
vlivanov
parents: 14222
diff changeset
  1081
        /**
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1082
         * Perform necessary <a href="MethodHandles.Lookup.html#secmgr">access checks</a>.
16118
9f3390f42157 8006439: Improve MethodHandles coverage
vlivanov
parents: 14222
diff changeset
  1083
         * Determines a trustable caller class to compare with refc, the symbolic reference class.
9f3390f42157 8006439: Improve MethodHandles coverage
vlivanov
parents: 14222
diff changeset
  1084
         * If this lookup object has private access, then the caller class is the lookupClass.
9f3390f42157 8006439: Improve MethodHandles coverage
vlivanov
parents: 14222
diff changeset
  1085
         * Otherwise, it is the caller of the currently executing public API method (e.g., findVirtual).
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1086
         * This function performs stack walk magic: do not refactor it.
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1087
         */
16906
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
  1088
        void checkSecurityManager(Class<?> refc, MemberName m, Class<?> caller) {
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1089
            SecurityManager smgr = System.getSecurityManager();
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1090
            if (smgr == null)  return;
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1091
            if (allowedModes == TRUSTED)  return;
16906
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
  1092
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
  1093
            final boolean overridden = isCheckMemberAccessOverridden(smgr);
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1094
            // Step 1:
16906
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
  1095
            {
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
  1096
                // Default policy is to allow Member.PUBLIC; no need to check
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
  1097
                // permission if SecurityManager is the default implementation
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
  1098
                final int which = Member.PUBLIC;
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
  1099
                final Class<?> clazz = refc;
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
  1100
                if (overridden) {
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
  1101
                    // Don't refactor; otherwise break the stack depth for
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
  1102
                    // checkMemberAccess of subclasses of SecurityManager as specified.
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
  1103
                    smgr.checkMemberAccess(clazz, which);
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
  1104
                }
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
  1105
            }
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
  1106
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1107
            // Step 2:
13044
8411854afc2b 7165628: Issues with java.lang.invoke.MethodHandles.Lookup
jrose
parents: 11535
diff changeset
  1108
            Class<?> callerClass = ((allowedModes & PRIVATE) != 0
8411854afc2b 7165628: Issues with java.lang.invoke.MethodHandles.Lookup
jrose
parents: 11535
diff changeset
  1109
                                    ? lookupClass  // for strong access modes, no extra check
16906
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
  1110
                                    : caller);
13044
8411854afc2b 7165628: Issues with java.lang.invoke.MethodHandles.Lookup
jrose
parents: 11535
diff changeset
  1111
            if (!VerifyAccess.classLoaderIsAncestor(lookupClass, refc) ||
8411854afc2b 7165628: Issues with java.lang.invoke.MethodHandles.Lookup
jrose
parents: 11535
diff changeset
  1112
                (callerClass != lookupClass &&
8411854afc2b 7165628: Issues with java.lang.invoke.MethodHandles.Lookup
jrose
parents: 11535
diff changeset
  1113
                 !VerifyAccess.classLoaderIsAncestor(callerClass, refc)))
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1114
                smgr.checkPackageAccess(VerifyAccess.getPackageName(refc));
16906
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
  1115
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1116
            // Step 3:
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1117
            if (m.isPublic()) return;
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1118
            Class<?> defc = m.getDeclaringClass();
16906
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
  1119
            {
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
  1120
                // Inline SecurityManager.checkMemberAccess
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
  1121
                final int which = Member.DECLARED;
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
  1122
                final Class<?> clazz = defc;
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
  1123
                if (!overridden) {
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
  1124
                    if (caller.getClassLoader() != clazz.getClassLoader()) {
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
  1125
                        smgr.checkPermission(SecurityConstants.CHECK_MEMBER_ACCESS_PERMISSION);
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
  1126
                    }
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
  1127
                } else {
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
  1128
                    // Don't refactor; otherwise break the stack depth for
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
  1129
                    // checkMemberAccess of subclasses of SecurityManager as specified.
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
  1130
                    smgr.checkMemberAccess(clazz, which);
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
  1131
                }
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
  1132
            }
44dfee24cb71 8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents: 16898
diff changeset
  1133
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1134
            // Step 4:
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1135
            if (defc != refc)
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1136
                smgr.checkPackageAccess(VerifyAccess.getPackageName(defc));
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1137
        }
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1138
13423
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1139
        void checkMethod(byte refKind, Class<?> refc, MemberName m) throws IllegalAccessException {
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1140
            boolean wantStatic = (refKind == REF_invokeStatic);
5722
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
  1141
            String message;
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
  1142
            if (m.isConstructor())
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
  1143
                message = "expected a method, not a constructor";
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
  1144
            else if (!m.isMethod())
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
  1145
                message = "expected a method";
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
  1146
            else if (wantStatic != m.isStatic())
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
  1147
                message = wantStatic ? "expected a static method" : "expected a non-static method";
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
  1148
            else
13423
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1149
                { checkAccess(refKind, refc, m); return; }
8821
2836ee97ee27 6839872: remove implementation inheritance from JSR 292 APIs
jrose
parents: 8349
diff changeset
  1150
            throw m.makeAccessException(message, this);
5722
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
  1151
        }
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
  1152
13423
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1153
        void checkField(byte refKind, Class<?> refc, MemberName m) throws IllegalAccessException {
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1154
            boolean wantStatic = !MethodHandleNatives.refKindHasReceiver(refKind);
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1155
            String message;
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1156
            if (wantStatic != m.isStatic())
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1157
                message = wantStatic ? "expected a static field" : "expected a non-static field";
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1158
            else
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1159
                { checkAccess(refKind, refc, m); return; }
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1160
            throw m.makeAccessException(message, this);
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1161
        }
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1162
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1163
        void checkAccess(byte refKind, Class<?> refc, MemberName m) throws IllegalAccessException {
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1164
            assert(m.referenceKindIsConsistentWith(refKind) &&
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1165
                   MethodHandleNatives.refKindIsValid(refKind) &&
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1166
                   (MethodHandleNatives.refKindIsField(refKind) == m.isField()));
5722
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
  1167
            int allowedModes = this.allowedModes;
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
  1168
            if (allowedModes == TRUSTED)  return;
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
  1169
            int mods = m.getModifiers();
13423
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1170
            if (Modifier.isFinal(mods) &&
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1171
                    MethodHandleNatives.refKindIsSetter(refKind))
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1172
                throw m.makeAccessException("unexpected set of a final field", this);
7555
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1173
            if (Modifier.isPublic(mods) && Modifier.isPublic(refc.getModifiers()) && allowedModes != 0)
5722
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
  1174
                return;  // common case
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
  1175
            int requestedModes = fixmods(mods);  // adjust 0 => PACKAGE
13423
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1176
            if ((requestedModes & allowedModes) != 0) {
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1177
                if (VerifyAccess.isMemberAccessible(refc, m.getDeclaringClass(),
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1178
                                                    mods, lookupClass(), allowedModes))
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1179
                    return;
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1180
            } else {
5722
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
  1181
                // Protected members can also be checked as if they were package-private.
13423
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1182
                if ((requestedModes & PROTECTED) != 0 && (allowedModes & PACKAGE) != 0
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1183
                        && VerifyAccess.isSamePackage(m.getDeclaringClass(), lookupClass()))
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1184
                    return;
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1185
            }
8821
2836ee97ee27 6839872: remove implementation inheritance from JSR 292 APIs
jrose
parents: 8349
diff changeset
  1186
            throw m.makeAccessException(accessFailedMessage(refc, m), this);
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1187
        }
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1188
5722
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
  1189
        String accessFailedMessage(Class<?> refc, MemberName m) {
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
  1190
            Class<?> defc = m.getDeclaringClass();
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
  1191
            int mods = m.getModifiers();
8347
e5daa5772ffd 7013730: JSR 292 reflective operations should report errors with standard exception types
jrose
parents: 8346
diff changeset
  1192
            // check the class first:
e5daa5772ffd 7013730: JSR 292 reflective operations should report errors with standard exception types
jrose
parents: 8346
diff changeset
  1193
            boolean classOK = (Modifier.isPublic(defc.getModifiers()) &&
e5daa5772ffd 7013730: JSR 292 reflective operations should report errors with standard exception types
jrose
parents: 8346
diff changeset
  1194
                               (defc == refc ||
e5daa5772ffd 7013730: JSR 292 reflective operations should report errors with standard exception types
jrose
parents: 8346
diff changeset
  1195
                                Modifier.isPublic(refc.getModifiers())));
e5daa5772ffd 7013730: JSR 292 reflective operations should report errors with standard exception types
jrose
parents: 8346
diff changeset
  1196
            if (!classOK && (allowedModes & PACKAGE) != 0) {
13044
8411854afc2b 7165628: Issues with java.lang.invoke.MethodHandles.Lookup
jrose
parents: 11535
diff changeset
  1197
                classOK = (VerifyAccess.isClassAccessible(defc, lookupClass(), ALL_MODES) &&
8347
e5daa5772ffd 7013730: JSR 292 reflective operations should report errors with standard exception types
jrose
parents: 8346
diff changeset
  1198
                           (defc == refc ||
13044
8411854afc2b 7165628: Issues with java.lang.invoke.MethodHandles.Lookup
jrose
parents: 11535
diff changeset
  1199
                            VerifyAccess.isClassAccessible(refc, lookupClass(), ALL_MODES)));
8347
e5daa5772ffd 7013730: JSR 292 reflective operations should report errors with standard exception types
jrose
parents: 8346
diff changeset
  1200
            }
e5daa5772ffd 7013730: JSR 292 reflective operations should report errors with standard exception types
jrose
parents: 8346
diff changeset
  1201
            if (!classOK)
5722
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
  1202
                return "class is not public";
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
  1203
            if (Modifier.isPublic(mods))
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
  1204
                return "access to public member failed";  // (how?)
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
  1205
            if (Modifier.isPrivate(mods))
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
  1206
                return "member is private";
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
  1207
            if (Modifier.isProtected(mods))
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
  1208
                return "member is protected";
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
  1209
            return "member is private to package";
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
  1210
        }
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1211
7555
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1212
        private static final boolean ALLOW_NESTMATE_ACCESS = false;
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1213
13423
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1214
        private void checkSpecialCaller(Class<?> specialCaller) throws IllegalAccessException {
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1215
            int allowedModes = this.allowedModes;
5722
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
  1216
            if (allowedModes == TRUSTED)  return;
7555
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1217
            if ((allowedModes & PRIVATE) == 0
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1218
                || (specialCaller != lookupClass()
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1219
                    && !(ALLOW_NESTMATE_ACCESS &&
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1220
                         VerifyAccess.isSamePackageMember(specialCaller, lookupClass()))))
8821
2836ee97ee27 6839872: remove implementation inheritance from JSR 292 APIs
jrose
parents: 8349
diff changeset
  1221
                throw new MemberName(specialCaller).
2836ee97ee27 6839872: remove implementation inheritance from JSR 292 APIs
jrose
parents: 8349
diff changeset
  1222
                    makeAccessException("no private access for invokespecial", this);
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1223
        }
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1224
13423
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1225
        private boolean restrictProtectedReceiver(MemberName method) {
5722
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
  1226
            // The accessing class only has the right to use a protected member
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
  1227
            // on itself or a subclass.  Enforce that restriction, from JVMS 5.4.4, etc.
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
  1228
            if (!method.isProtected() || method.isStatic()
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
  1229
                || allowedModes == TRUSTED
7555
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1230
                || method.getDeclaringClass() == lookupClass()
9731
d0f7a3e441c4 7044892: JSR 292: API entry points sometimes throw the wrong exceptions or doesn't throw the expected one
jrose
parents: 9730
diff changeset
  1231
                || VerifyAccess.isSamePackage(method.getDeclaringClass(), lookupClass())
7555
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1232
                || (ALLOW_NESTMATE_ACCESS &&
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1233
                    VerifyAccess.isSamePackageMember(method.getDeclaringClass(), lookupClass())))
13423
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1234
                return false;
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1235
            return true;
5722
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
  1236
        }
13423
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1237
        private MethodHandle restrictReceiver(MemberName method, MethodHandle mh, Class<?> caller) throws IllegalAccessException {
5722
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
  1238
            assert(!method.isStatic());
13423
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1239
            // receiver type of mh is too wide; narrow to caller
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1240
            if (!method.getDeclaringClass().isAssignableFrom(caller)) {
8821
2836ee97ee27 6839872: remove implementation inheritance from JSR 292 APIs
jrose
parents: 8349
diff changeset
  1241
                throw method.makeAccessException("caller class must be a subclass below the method", caller);
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1242
            }
5722
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
  1243
            MethodType rawType = mh.type();
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
  1244
            if (rawType.parameterType(0) == caller)  return mh;
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
  1245
            MethodType narrowType = rawType.changeParameterType(0, caller);
13423
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1246
            return mh.viewAsType(narrowType);
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1247
        }
5722
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
  1248
16118
9f3390f42157 8006439: Improve MethodHandles coverage
vlivanov
parents: 14222
diff changeset
  1249
        private MethodHandle getDirectMethod(byte refKind, Class<?> refc, MemberName method, Class<?> callerClass) throws IllegalAccessException {
13423
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1250
            return getDirectMethodCommon(refKind, refc, method,
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1251
                    (refKind == REF_invokeSpecial ||
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1252
                        (MethodHandleNatives.refKindHasReceiver(refKind) &&
16118
9f3390f42157 8006439: Improve MethodHandles coverage
vlivanov
parents: 14222
diff changeset
  1253
                            restrictProtectedReceiver(method))), callerClass);
13423
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1254
        }
16118
9f3390f42157 8006439: Improve MethodHandles coverage
vlivanov
parents: 14222
diff changeset
  1255
        private MethodHandle getDirectMethodNoRestrict(byte refKind, Class<?> refc, MemberName method, Class<?> callerClass) throws IllegalAccessException {
9f3390f42157 8006439: Improve MethodHandles coverage
vlivanov
parents: 14222
diff changeset
  1256
            return getDirectMethodCommon(refKind, refc, method, false, callerClass);
13423
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1257
        }
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1258
        private MethodHandle getDirectMethodCommon(byte refKind, Class<?> refc, MemberName method,
16118
9f3390f42157 8006439: Improve MethodHandles coverage
vlivanov
parents: 14222
diff changeset
  1259
                                                   boolean doRestrict, Class<?> callerClass) throws IllegalAccessException {
13423
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1260
            checkMethod(refKind, refc, method);
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1261
            if (method.isMethodHandleInvoke())
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1262
                return fakeMethodHandleInvoke(method);
16898
b321dfd1163f 8008140: Better method handle resolution
vlivanov
parents: 16123
diff changeset
  1263
b321dfd1163f 8008140: Better method handle resolution
vlivanov
parents: 16123
diff changeset
  1264
            Class<?> refcAsSuper;
b321dfd1163f 8008140: Better method handle resolution
vlivanov
parents: 16123
diff changeset
  1265
            if (refKind == REF_invokeSpecial &&
b321dfd1163f 8008140: Better method handle resolution
vlivanov
parents: 16123
diff changeset
  1266
                refc != lookupClass() &&
b321dfd1163f 8008140: Better method handle resolution
vlivanov
parents: 16123
diff changeset
  1267
                refc != (refcAsSuper = lookupClass().getSuperclass()) &&
b321dfd1163f 8008140: Better method handle resolution
vlivanov
parents: 16123
diff changeset
  1268
                refc.isAssignableFrom(lookupClass())) {
b321dfd1163f 8008140: Better method handle resolution
vlivanov
parents: 16123
diff changeset
  1269
                assert(!method.getName().equals("<init>"));  // not this code path
b321dfd1163f 8008140: Better method handle resolution
vlivanov
parents: 16123
diff changeset
  1270
                // Per JVMS 6.5, desc. of invokespecial instruction:
b321dfd1163f 8008140: Better method handle resolution
vlivanov
parents: 16123
diff changeset
  1271
                // If the method is in a superclass of the LC,
b321dfd1163f 8008140: Better method handle resolution
vlivanov
parents: 16123
diff changeset
  1272
                // and if our original search was above LC.super,
b321dfd1163f 8008140: Better method handle resolution
vlivanov
parents: 16123
diff changeset
  1273
                // repeat the search (symbolic lookup) from LC.super.
b321dfd1163f 8008140: Better method handle resolution
vlivanov
parents: 16123
diff changeset
  1274
                // FIXME: MemberName.resolve should handle this instead.
b321dfd1163f 8008140: Better method handle resolution
vlivanov
parents: 16123
diff changeset
  1275
                MemberName m2 = new MemberName(refcAsSuper,
b321dfd1163f 8008140: Better method handle resolution
vlivanov
parents: 16123
diff changeset
  1276
                                               method.getName(),
b321dfd1163f 8008140: Better method handle resolution
vlivanov
parents: 16123
diff changeset
  1277
                                               method.getMethodType(),
b321dfd1163f 8008140: Better method handle resolution
vlivanov
parents: 16123
diff changeset
  1278
                                               REF_invokeSpecial);
b321dfd1163f 8008140: Better method handle resolution
vlivanov
parents: 16123
diff changeset
  1279
                m2 = IMPL_NAMES.resolveOrNull(refKind, m2, lookupClassOrNull());
b321dfd1163f 8008140: Better method handle resolution
vlivanov
parents: 16123
diff changeset
  1280
                if (m2 == null)  throw new InternalError(method.toString());
b321dfd1163f 8008140: Better method handle resolution
vlivanov
parents: 16123
diff changeset
  1281
                method = m2;
b321dfd1163f 8008140: Better method handle resolution
vlivanov
parents: 16123
diff changeset
  1282
                refc = refcAsSuper;
b321dfd1163f 8008140: Better method handle resolution
vlivanov
parents: 16123
diff changeset
  1283
                // redo basic checks
b321dfd1163f 8008140: Better method handle resolution
vlivanov
parents: 16123
diff changeset
  1284
                checkMethod(refKind, refc, method);
b321dfd1163f 8008140: Better method handle resolution
vlivanov
parents: 16123
diff changeset
  1285
            }
b321dfd1163f 8008140: Better method handle resolution
vlivanov
parents: 16123
diff changeset
  1286
16030
265a0d86c9ff 7087570: java.lang.invoke.MemberName information wrong for method handles created with findConstructor
kmo
parents: 14222
diff changeset
  1287
            MethodHandle mh = DirectMethodHandle.make(refKind, refc, method);
16118
9f3390f42157 8006439: Improve MethodHandles coverage
vlivanov
parents: 14222
diff changeset
  1288
            mh = maybeBindCaller(method, mh, callerClass);
13423
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1289
            mh = mh.setVarargs(method);
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1290
            if (doRestrict)
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1291
                mh = restrictReceiver(method, mh, lookupClass());
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1292
            return mh;
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1293
        }
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1294
        private MethodHandle fakeMethodHandleInvoke(MemberName method) {
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1295
            return throwException(method.getReturnType(), UnsupportedOperationException.class);
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1296
        }
16118
9f3390f42157 8006439: Improve MethodHandles coverage
vlivanov
parents: 14222
diff changeset
  1297
        private MethodHandle maybeBindCaller(MemberName method, MethodHandle mh,
9f3390f42157 8006439: Improve MethodHandles coverage
vlivanov
parents: 14222
diff changeset
  1298
                                             Class<?> callerClass)
9f3390f42157 8006439: Improve MethodHandles coverage
vlivanov
parents: 14222
diff changeset
  1299
                                             throws IllegalAccessException {
14222
58f55d4dde46 7196190: Improve method of handling MethodHandles
jrose
parents: 13610
diff changeset
  1300
            if (allowedModes == TRUSTED || !MethodHandleNatives.isCallerSensitive(method))
58f55d4dde46 7196190: Improve method of handling MethodHandles
jrose
parents: 13610
diff changeset
  1301
                return mh;
58f55d4dde46 7196190: Improve method of handling MethodHandles
jrose
parents: 13610
diff changeset
  1302
            Class<?> hostClass = lookupClass;
58f55d4dde46 7196190: Improve method of handling MethodHandles
jrose
parents: 13610
diff changeset
  1303
            if ((allowedModes & PRIVATE) == 0)  // caller must use full-power lookup
16118
9f3390f42157 8006439: Improve MethodHandles coverage
vlivanov
parents: 14222
diff changeset
  1304
                hostClass = callerClass;  // callerClass came from a security manager style stack walk
14222
58f55d4dde46 7196190: Improve method of handling MethodHandles
jrose
parents: 13610
diff changeset
  1305
            MethodHandle cbmh = MethodHandleImpl.bindCaller(mh, hostClass);
58f55d4dde46 7196190: Improve method of handling MethodHandles
jrose
parents: 13610
diff changeset
  1306
            // Note: caller will apply varargs after this step happens.
58f55d4dde46 7196190: Improve method of handling MethodHandles
jrose
parents: 13610
diff changeset
  1307
            return cbmh;
58f55d4dde46 7196190: Improve method of handling MethodHandles
jrose
parents: 13610
diff changeset
  1308
        }
13423
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1309
        private MethodHandle getDirectField(byte refKind, Class<?> refc, MemberName field) throws IllegalAccessException {
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1310
            checkField(refKind, refc, field);
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1311
            MethodHandle mh = DirectMethodHandle.make(refc, field);
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1312
            boolean doRestrict = (MethodHandleNatives.refKindHasReceiver(refKind) &&
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1313
                                    restrictProtectedReceiver(field));
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1314
            if (doRestrict)
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1315
                mh = restrictReceiver(field, mh, lookupClass());
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1316
            return mh;
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1317
        }
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1318
        private MethodHandle getDirectConstructor(Class<?> refc, MemberName ctor) throws IllegalAccessException {
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1319
            assert(ctor.isConstructor());
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1320
            checkAccess(REF_newInvokeSpecial, refc, ctor);
14222
58f55d4dde46 7196190: Improve method of handling MethodHandles
jrose
parents: 13610
diff changeset
  1321
            assert(!MethodHandleNatives.isCallerSensitive(ctor));  // maybeBindCaller not relevant here
13423
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1322
            return DirectMethodHandle.make(ctor).setVarargs(ctor);
5722
4ada807383c8 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 4537
diff changeset
  1323
        }
9780
6fc3b49cfee4 7050328: (jsr-292) findConstructor throws ExceptionInInitializerError if run under SecurityManager
jrose
parents: 9752
diff changeset
  1324
6fc3b49cfee4 7050328: (jsr-292) findConstructor throws ExceptionInInitializerError if run under SecurityManager
jrose
parents: 9752
diff changeset
  1325
        /** Hook called from the JVM (via MethodHandleNatives) to link MH constants:
6fc3b49cfee4 7050328: (jsr-292) findConstructor throws ExceptionInInitializerError if run under SecurityManager
jrose
parents: 9752
diff changeset
  1326
         */
6fc3b49cfee4 7050328: (jsr-292) findConstructor throws ExceptionInInitializerError if run under SecurityManager
jrose
parents: 9752
diff changeset
  1327
        /*non-public*/
13423
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1328
        MethodHandle linkMethodHandleConstant(byte refKind, Class<?> defc, String name, Object type) throws ReflectiveOperationException {
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1329
            MemberName resolved = null;
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1330
            if (type instanceof MemberName) {
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1331
                resolved = (MemberName) type;
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1332
                if (!resolved.isResolved())  throw new InternalError("unresolved MemberName");
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1333
                assert(name == null || name.equals(resolved.getName()));
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1334
            }
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1335
            if (MethodHandleNatives.refKindIsField(refKind)) {
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1336
                MemberName field = (resolved != null) ? resolved
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1337
                        : resolveOrFail(refKind, defc, name, (Class<?>) type);
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1338
                return getDirectField(refKind, defc, field);
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1339
            } else if (MethodHandleNatives.refKindIsMethod(refKind)) {
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1340
                MemberName method = (resolved != null) ? resolved
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1341
                        : resolveOrFail(refKind, defc, name, (MethodType) type);
16118
9f3390f42157 8006439: Improve MethodHandles coverage
vlivanov
parents: 14222
diff changeset
  1342
                return getDirectMethod(refKind, defc, method, lookupClass);
13423
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1343
            } else if (refKind == REF_newInvokeSpecial) {
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1344
                assert(name == null || name.equals("<init>"));
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1345
                MemberName ctor = (resolved != null) ? resolved
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1346
                        : resolveOrFail(REF_newInvokeSpecial, defc, name, (MethodType) type);
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1347
                return getDirectConstructor(defc, ctor);
9780
6fc3b49cfee4 7050328: (jsr-292) findConstructor throws ExceptionInInitializerError if run under SecurityManager
jrose
parents: 9752
diff changeset
  1348
            }
6fc3b49cfee4 7050328: (jsr-292) findConstructor throws ExceptionInInitializerError if run under SecurityManager
jrose
parents: 9752
diff changeset
  1349
            // oops
6fc3b49cfee4 7050328: (jsr-292) findConstructor throws ExceptionInInitializerError if run under SecurityManager
jrose
parents: 9752
diff changeset
  1350
            throw new ReflectiveOperationException("bad MethodHandle constant #"+refKind+" "+name+" : "+type);
6fc3b49cfee4 7050328: (jsr-292) findConstructor throws ExceptionInInitializerError if run under SecurityManager
jrose
parents: 9752
diff changeset
  1351
        }
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1352
    }
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1353
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1354
    /**
8346
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1355
     * Produces a method handle giving read access to elements of an array.
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1356
     * The type of the method handle will have a return type of the array's
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1357
     * element type.  Its first argument will be the array type,
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1358
     * and the second will be {@code int}.
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1359
     * @param arrayClass an array type
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1360
     * @return a method handle which can load values from the given array type
8346
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1361
     * @throws NullPointerException if the argument is null
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1362
     * @throws  IllegalArgumentException if arrayClass is not an array type
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1363
     */
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1364
    public static
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1365
    MethodHandle arrayElementGetter(Class<?> arrayClass) throws IllegalArgumentException {
13423
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1366
        return MethodHandleImpl.makeArrayElementAccessor(arrayClass, false);
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1367
    }
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1368
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1369
    /**
8346
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1370
     * Produces a method handle giving write access to elements of an array.
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1371
     * The type of the method handle will have a void return type.
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1372
     * Its last argument will be the array's element type.
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1373
     * The first and second arguments will be the array type and int.
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1374
     * @return a method handle which can store values into the array type
8346
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1375
     * @throws NullPointerException if the argument is null
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1376
     * @throws IllegalArgumentException if arrayClass is not an array type
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1377
     */
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1378
    public static
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1379
    MethodHandle arrayElementSetter(Class<?> arrayClass) throws IllegalArgumentException {
13423
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1380
        return MethodHandleImpl.makeArrayElementAccessor(arrayClass, true);
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1381
    }
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1382
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1383
    /// method handle invocation (reflective style)
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1384
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1385
    /**
8346
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1386
     * Produces a method handle which will invoke any method handle of the
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1387
     * given {@code type}, with a given number of trailing arguments replaced by
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1388
     * a single trailing {@code Object[]} array.
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1389
     * The resulting invoker will be a method handle with the following
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1390
     * arguments:
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1391
     * <ul>
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1392
     * <li>a single {@code MethodHandle} target
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1393
     * <li>zero or more leading values (counted by {@code leadingArgCount})
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1394
     * <li>an {@code Object[]} array containing trailing arguments
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1395
     * </ul>
7555
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1396
     * <p>
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1397
     * The invoker will invoke its target like a call to {@link MethodHandle#invoke invoke} with
7555
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1398
     * the indicated {@code type}.
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1399
     * That is, if the target is exactly of the given {@code type}, it will behave
8346
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1400
     * like {@code invokeExact}; otherwise it behave as if {@link MethodHandle#asType asType}
7555
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1401
     * is used to convert the target to the required {@code type}.
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1402
     * <p>
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1403
     * The type of the returned invoker will not be the given {@code type}, but rather
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1404
     * will have all parameters except the first {@code leadingArgCount}
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1405
     * replaced by a single array of type {@code Object[]}, which will be
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1406
     * the final parameter.
7555
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1407
     * <p>
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1408
     * Before invoking its target, the invoker will spread the final array, apply
7555
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1409
     * reference casts as necessary, and unbox and widen primitive arguments.
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1410
     * <p>
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1411
     * This method is equivalent to the following code (though it may be more efficient):
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1412
     * <p><blockquote><pre>
9645
dabb5e4edc4c 7034977: JSR 292 MethodHandle.invokeGeneric should be renamed MethodHandle.invoke
jrose
parents: 8822
diff changeset
  1413
MethodHandle invoker = MethodHandles.invoker(type);
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1414
int spreadArgCount = type.parameterCount() - leadingArgCount;
8345
9e2483e6cfab 7013417: JSR 292 needs to support variadic method handle calls
jrose
parents: 7562
diff changeset
  1415
invoker = invoker.asSpreader(Object[].class, spreadArgCount);
9e2483e6cfab 7013417: JSR 292 needs to support variadic method handle calls
jrose
parents: 7562
diff changeset
  1416
return invoker;
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1417
     * </pre></blockquote>
8346
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1418
     * <p>
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1419
     * This method throws no reflective or security exceptions.
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1420
     * @param type the desired target type
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1421
     * @param leadingArgCount number of fixed arguments, to be passed unchanged to the target
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1422
     * @return a method handle suitable for invoking any method handle of the given type
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1423
     * @throws NullPointerException if {@code type} is null
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1424
     * @throws IllegalArgumentException if {@code leadingArgCount} is not in
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1425
     *                  the range from 0 to {@code type.parameterCount()} inclusive
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1426
     */
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1427
    static public
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1428
    MethodHandle spreadInvoker(MethodType type, int leadingArgCount) {
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1429
        if (leadingArgCount < 0 || leadingArgCount > type.parameterCount())
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1430
            throw new IllegalArgumentException("bad argument count "+leadingArgCount);
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1431
        return type.invokers().spreadInvoker(leadingArgCount);
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1432
    }
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1433
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1434
    /**
8346
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1435
     * Produces a special <em>invoker method handle</em> which can be used to
9645
dabb5e4edc4c 7034977: JSR 292 MethodHandle.invokeGeneric should be renamed MethodHandle.invoke
jrose
parents: 8822
diff changeset
  1436
     * invoke any method handle of the given type, as if by {@link MethodHandle#invokeExact invokeExact}.
8346
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1437
     * The resulting invoker will have a type which is
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1438
     * exactly equal to the desired type, except that it will accept
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1439
     * an additional leading argument of type {@code MethodHandle}.
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1440
     * <p>
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1441
     * This method is equivalent to the following code (though it may be more efficient):
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1442
     * <p><blockquote><pre>
8346
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1443
publicLookup().findVirtual(MethodHandle.class, "invokeExact", type)
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1444
     * </pre></blockquote>
8346
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1445
     *
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1446
     * <p style="font-size:smaller;">
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1447
     * <em>Discussion:</em>
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1448
     * Invoker method handles can be useful when working with variable method handles
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1449
     * of unknown types.
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1450
     * For example, to emulate an {@code invokeExact} call to a variable method
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1451
     * handle {@code M}, extract its type {@code T},
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1452
     * look up the invoker method {@code X} for {@code T},
9645
dabb5e4edc4c 7034977: JSR 292 MethodHandle.invokeGeneric should be renamed MethodHandle.invoke
jrose
parents: 8822
diff changeset
  1453
     * and call the invoker method, as {@code X.invoke(T, A...)}.
8346
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1454
     * (It would not work to call {@code X.invokeExact}, since the type {@code T}
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1455
     * is unknown.)
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1456
     * If spreading, collecting, or other argument transformations are required,
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1457
     * they can be applied once to the invoker {@code X} and reused on many {@code M}
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1458
     * method handle values, as long as they are compatible with the type of {@code X}.
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1459
     * <p>
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1460
     * <em>(Note:  The invoker method is not available via the Core Reflection API.
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1461
     * An attempt to call {@linkplain java.lang.reflect.Method#invoke java.lang.reflect.Method.invoke}
9645
dabb5e4edc4c 7034977: JSR 292 MethodHandle.invokeGeneric should be renamed MethodHandle.invoke
jrose
parents: 8822
diff changeset
  1462
     * on the declared {@code invokeExact} or {@code invoke} method will raise an
8346
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1463
     * {@link java.lang.UnsupportedOperationException UnsupportedOperationException}.)</em>
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1464
     * <p>
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1465
     * This method throws no reflective or security exceptions.
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1466
     * @param type the desired target type
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1467
     * @return a method handle suitable for invoking any method handle of the given type
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1468
     */
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1469
    static public
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1470
    MethodHandle exactInvoker(MethodType type) {
8821
2836ee97ee27 6839872: remove implementation inheritance from JSR 292 APIs
jrose
parents: 8349
diff changeset
  1471
        return type.invokers().exactInvoker();
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1472
    }
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1473
8346
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1474
    /**
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1475
     * Produces a special <em>invoker method handle</em> which can be used to
9645
dabb5e4edc4c 7034977: JSR 292 MethodHandle.invokeGeneric should be renamed MethodHandle.invoke
jrose
parents: 8822
diff changeset
  1476
     * invoke any method handle compatible with the given type, as if by {@link MethodHandle#invoke invoke}.
8346
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1477
     * The resulting invoker will have a type which is
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1478
     * exactly equal to the desired type, except that it will accept
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1479
     * an additional leading argument of type {@code MethodHandle}.
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1480
     * <p>
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1481
     * Before invoking its target, if the target differs from the expected type,
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1482
     * the invoker will apply reference casts as
9645
dabb5e4edc4c 7034977: JSR 292 MethodHandle.invokeGeneric should be renamed MethodHandle.invoke
jrose
parents: 8822
diff changeset
  1483
     * necessary and box, unbox, or widen primitive values, as if by {@link MethodHandle#asType asType}.
dabb5e4edc4c 7034977: JSR 292 MethodHandle.invokeGeneric should be renamed MethodHandle.invoke
jrose
parents: 8822
diff changeset
  1484
     * Similarly, the return value will be converted as necessary.
dabb5e4edc4c 7034977: JSR 292 MethodHandle.invokeGeneric should be renamed MethodHandle.invoke
jrose
parents: 8822
diff changeset
  1485
     * If the target is a {@linkplain MethodHandle#asVarargsCollector variable arity method handle},
dabb5e4edc4c 7034977: JSR 292 MethodHandle.invokeGeneric should be renamed MethodHandle.invoke
jrose
parents: 8822
diff changeset
  1486
     * the required arity conversion will be made, again as if by {@link MethodHandle#asType asType}.
8346
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1487
     * <p>
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1488
     * A {@linkplain MethodType#genericMethodType general method type},
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1489
     * mentions only {@code Object} arguments and return values.
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1490
     * An invoker for such a type is capable of calling any method handle
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1491
     * of the same arity as the general type.
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1492
     * <p>
8346
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1493
     * This method is equivalent to the following code (though it may be more efficient):
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1494
     * <p><blockquote><pre>
9645
dabb5e4edc4c 7034977: JSR 292 MethodHandle.invokeGeneric should be renamed MethodHandle.invoke
jrose
parents: 8822
diff changeset
  1495
publicLookup().findVirtual(MethodHandle.class, "invoke", type)
8346
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1496
     * </pre></blockquote>
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1497
     * <p>
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1498
     * This method throws no reflective or security exceptions.
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1499
     * @param type the desired target type
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1500
     * @return a method handle suitable for invoking any method handle convertible to the given type
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1501
     */
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1502
    static public
9645
dabb5e4edc4c 7034977: JSR 292 MethodHandle.invokeGeneric should be renamed MethodHandle.invoke
jrose
parents: 8822
diff changeset
  1503
    MethodHandle invoker(MethodType type) {
dabb5e4edc4c 7034977: JSR 292 MethodHandle.invokeGeneric should be renamed MethodHandle.invoke
jrose
parents: 8822
diff changeset
  1504
        return type.invokers().generalInvoker();
dabb5e4edc4c 7034977: JSR 292 MethodHandle.invokeGeneric should be renamed MethodHandle.invoke
jrose
parents: 8822
diff changeset
  1505
    }
dabb5e4edc4c 7034977: JSR 292 MethodHandle.invokeGeneric should be renamed MethodHandle.invoke
jrose
parents: 8822
diff changeset
  1506
13423
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1507
    static /*non-public*/
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1508
    MethodHandle basicInvoker(MethodType type) {
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1509
        return type.form().basicInvoker();
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1510
    }
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1511
13423
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1512
     /// method handle modification (creation from other method handles)
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1513
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1514
    /**
8346
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1515
     * Produces a method handle which adapts the type of the
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1516
     * given method handle to a new type by pairwise argument and return type conversion.
7555
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1517
     * The original type and new type must have the same number of arguments.
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1518
     * The resulting method handle is guaranteed to report a type
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1519
     * which is equal to the desired new type.
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1520
     * <p>
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1521
     * If the original type and new type are equal, returns target.
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1522
     * <p>
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1523
     * The same conversions are allowed as for {@link MethodHandle#asType MethodHandle.asType},
7555
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1524
     * and some additional conversions are also applied if those conversions fail.
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1525
     * Given types <em>T0</em>, <em>T1</em>, one of the following conversions is applied
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1526
     * if possible, before or instead of any conversions done by {@code asType}:
7555
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1527
     * <ul>
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1528
     * <li>If <em>T0</em> and <em>T1</em> are references, and <em>T1</em> is an interface type,
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1529
     *     then the value of type <em>T0</em> is passed as a <em>T1</em> without a cast.
7555
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1530
     *     (This treatment of interfaces follows the usage of the bytecode verifier.)
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1531
     * <li>If <em>T0</em> is boolean and <em>T1</em> is another primitive,
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1532
     *     the boolean is converted to a byte value, 1 for true, 0 for false.
7555
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1533
     *     (This treatment follows the usage of the bytecode verifier.)
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1534
     * <li>If <em>T1</em> is boolean and <em>T0</em> is another primitive,
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1535
     *     <em>T0</em> is converted to byte via Java casting conversion (JLS 5.5),
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1536
     *     and the low order bit of the result is tested, as if by {@code (x & 1) != 0}.
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1537
     * <li>If <em>T0</em> and <em>T1</em> are primitives other than boolean,
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1538
     *     then a Java casting conversion (JLS 5.5) is applied.
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1539
     *     (Specifically, <em>T0</em> will convert to <em>T1</em> by
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1540
     *     widening and/or narrowing.)
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1541
     * <li>If <em>T0</em> is a reference and <em>T1</em> a primitive, an unboxing
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1542
     *     conversion will be applied at runtime, possibly followed
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1543
     *     by a Java casting conversion (JLS 5.5) on the primitive value,
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1544
     *     possibly followed by a conversion from byte to boolean by testing
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1545
     *     the low-order bit.
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1546
     * <li>If <em>T0</em> is a reference and <em>T1</em> a primitive,
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1547
     *     and if the reference is null at runtime, a zero value is introduced.
7555
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1548
     * </ul>
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1549
     * @param target the method handle to invoke after arguments are retyped
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1550
     * @param newType the expected type of the new method handle
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1551
     * @return a method handle which delegates to the target after performing
7555
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1552
     *           any necessary argument conversions, and arranges for any
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1553
     *           necessary return value conversions
8346
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1554
     * @throws NullPointerException if either argument is null
7555
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1555
     * @throws WrongMethodTypeException if the conversion cannot be made
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1556
     * @see MethodHandle#asType
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1557
     */
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1558
    public static
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1559
    MethodHandle explicitCastArguments(MethodHandle target, MethodType newType) {
13423
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1560
        if (!target.type().isCastableTo(newType)) {
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1561
            throw new WrongMethodTypeException("cannot explicitly cast "+target+" to "+newType);
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1562
        }
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1563
        return MethodHandleImpl.makePairwiseConvert(target, newType, 2);
7555
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1564
    }
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1565
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1566
    /**
8346
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1567
     * Produces a method handle which adapts the calling sequence of the
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1568
     * given method handle to a new type, by reordering the arguments.
7555
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1569
     * The resulting method handle is guaranteed to report a type
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1570
     * which is equal to the desired new type.
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1571
     * <p>
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1572
     * The given array controls the reordering.
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1573
     * Call {@code #I} the number of incoming parameters (the value
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1574
     * {@code newType.parameterCount()}, and call {@code #O} the number
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1575
     * of outgoing parameters (the value {@code target.type().parameterCount()}).
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1576
     * Then the length of the reordering array must be {@code #O},
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1577
     * and each element must be a non-negative number less than {@code #I}.
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1578
     * For every {@code N} less than {@code #O}, the {@code N}-th
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1579
     * outgoing argument will be taken from the {@code I}-th incoming
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1580
     * argument, where {@code I} is {@code reorder[N]}.
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1581
     * <p>
7555
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1582
     * No argument or return value conversions are applied.
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1583
     * The type of each incoming argument, as determined by {@code newType},
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1584
     * must be identical to the type of the corresponding outgoing parameter
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1585
     * or parameters in the target method handle.
7555
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1586
     * The return type of {@code newType} must be identical to the return
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1587
     * type of the original target.
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1588
     * <p>
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1589
     * The reordering array need not specify an actual permutation.
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1590
     * An incoming argument will be duplicated if its index appears
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1591
     * more than once in the array, and an incoming argument will be dropped
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1592
     * if its index does not appear in the array.
7555
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1593
     * As in the case of {@link #dropArguments(MethodHandle,int,List) dropArguments},
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1594
     * incoming arguments which are not mentioned in the reordering array
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1595
     * are may be any type, as determined only by {@code newType}.
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1596
     * <blockquote><pre>
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1597
import static java.lang.invoke.MethodHandles.*;
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1598
import static java.lang.invoke.MethodType.*;
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1599
...
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1600
MethodType intfn1 = methodType(int.class, int.class);
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1601
MethodType intfn2 = methodType(int.class, int.class, int.class);
7555
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1602
MethodHandle sub = ... {int x, int y => x-y} ...;
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1603
assert(sub.type().equals(intfn2));
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1604
MethodHandle sub1 = permuteArguments(sub, intfn2, 0, 1);
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1605
MethodHandle rsub = permuteArguments(sub, intfn2, 1, 0);
7555
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1606
assert((int)rsub.invokeExact(1, 100) == 99);
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1607
MethodHandle add = ... {int x, int y => x+y} ...;
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1608
assert(add.type().equals(intfn2));
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1609
MethodHandle twice = permuteArguments(add, intfn1, 0, 0);
7555
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1610
assert(twice.type().equals(intfn1));
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1611
assert((int)twice.invokeExact(21) == 42);
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1612
     * </pre></blockquote>
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1613
     * @param target the method handle to invoke after arguments are reordered
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1614
     * @param newType the expected type of the new method handle
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1615
     * @param reorder an index array which controls the reordering
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1616
     * @return a method handle which delegates to the target after it
7555
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1617
     *           drops unused arguments and moves and/or duplicates the other arguments
8346
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1618
     * @throws NullPointerException if any argument is null
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1619
     * @throws IllegalArgumentException if the index array length is not equal to
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1620
     *                  the arity of the target, or if any index array element
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1621
     *                  not a valid index for a parameter of {@code newType},
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1622
     *                  or if two corresponding parameter types in
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1623
     *                  {@code target.type()} and {@code newType} are not identical,
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1624
     */
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1625
    public static
7555
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1626
    MethodHandle permuteArguments(MethodHandle target, MethodType newType, int... reorder) {
13423
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1627
        checkReorder(reorder, newType, target.type());
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1628
        return target.permuteArguments(newType, reorder);
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1629
    }
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1630
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1631
    private static void checkReorder(int[] reorder, MethodType newType, MethodType oldType) {
9646
5ebbe5ab084f 6939861: JVM should handle more conversion operations
jrose
parents: 9645
diff changeset
  1632
        if (newType.returnType() != oldType.returnType())
5ebbe5ab084f 6939861: JVM should handle more conversion operations
jrose
parents: 9645
diff changeset
  1633
            throw newIllegalArgumentException("return types do not match",
5ebbe5ab084f 6939861: JVM should handle more conversion operations
jrose
parents: 9645
diff changeset
  1634
                    oldType, newType);
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1635
        if (reorder.length == oldType.parameterCount()) {
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1636
            int limit = newType.parameterCount();
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1637
            boolean bad = false;
9646
5ebbe5ab084f 6939861: JVM should handle more conversion operations
jrose
parents: 9645
diff changeset
  1638
            for (int j = 0; j < reorder.length; j++) {
5ebbe5ab084f 6939861: JVM should handle more conversion operations
jrose
parents: 9645
diff changeset
  1639
                int i = reorder[j];
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1640
                if (i < 0 || i >= limit) {
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1641
                    bad = true; break;
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1642
                }
9646
5ebbe5ab084f 6939861: JVM should handle more conversion operations
jrose
parents: 9645
diff changeset
  1643
                Class<?> src = newType.parameterType(i);
5ebbe5ab084f 6939861: JVM should handle more conversion operations
jrose
parents: 9645
diff changeset
  1644
                Class<?> dst = oldType.parameterType(j);
5ebbe5ab084f 6939861: JVM should handle more conversion operations
jrose
parents: 9645
diff changeset
  1645
                if (src != dst)
5ebbe5ab084f 6939861: JVM should handle more conversion operations
jrose
parents: 9645
diff changeset
  1646
                    throw newIllegalArgumentException("parameter types do not match after reorder",
5ebbe5ab084f 6939861: JVM should handle more conversion operations
jrose
parents: 9645
diff changeset
  1647
                            oldType, newType);
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1648
            }
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1649
            if (!bad)  return;
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1650
        }
9646
5ebbe5ab084f 6939861: JVM should handle more conversion operations
jrose
parents: 9645
diff changeset
  1651
        throw newIllegalArgumentException("bad reorder array: "+Arrays.toString(reorder));
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1652
    }
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1653
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1654
    /**
8346
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1655
     * Produces a method handle of the requested return type which returns the given
7555
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1656
     * constant value every time it is invoked.
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1657
     * <p>
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1658
     * Before the method handle is returned, the passed-in value is converted to the requested type.
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1659
     * If the requested type is primitive, widening primitive conversions are attempted,
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1660
     * else reference conversions are attempted.
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1661
     * <p>The returned method handle is equivalent to {@code identity(type).bindTo(value)}.
7555
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1662
     * @param type the return type of the desired method handle
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1663
     * @param value the value to return
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1664
     * @return a method handle of the given return type and no arguments, which always returns the given value
8346
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1665
     * @throws NullPointerException if the {@code type} argument is null
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1666
     * @throws ClassCastException if the value cannot be converted to the required return type
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1667
     * @throws IllegalArgumentException if the given type is {@code void.class}
7555
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1668
     */
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1669
    public static
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1670
    MethodHandle constant(Class<?> type, Object value) {
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1671
        if (type.isPrimitive()) {
8346
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1672
            if (type == void.class)
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1673
                throw newIllegalArgumentException("void type");
7555
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1674
            Wrapper w = Wrapper.forPrimitiveType(type);
9646
5ebbe5ab084f 6939861: JVM should handle more conversion operations
jrose
parents: 9645
diff changeset
  1675
            return insertArguments(identity(type), 0, w.convert(value, type));
7555
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1676
        } else {
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1677
            return identity(type).bindTo(type.cast(value));
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1678
        }
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1679
    }
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1680
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1681
    /**
8346
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1682
     * Produces a method handle which returns its sole argument when invoked.
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1683
     * @param type the type of the sole parameter and return value of the desired method handle
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1684
     * @return a unary method handle which accepts and returns the given type
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1685
     * @throws NullPointerException if the argument is null
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1686
     * @throws IllegalArgumentException if the given type is {@code void.class}
7555
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1687
     */
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1688
    public static
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1689
    MethodHandle identity(Class<?> type) {
8346
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1690
        if (type == void.class)
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1691
            throw newIllegalArgumentException("void type");
8821
2836ee97ee27 6839872: remove implementation inheritance from JSR 292 APIs
jrose
parents: 8349
diff changeset
  1692
        else if (type == Object.class)
2836ee97ee27 6839872: remove implementation inheritance from JSR 292 APIs
jrose
parents: 8349
diff changeset
  1693
            return ValueConversions.identity();
2836ee97ee27 6839872: remove implementation inheritance from JSR 292 APIs
jrose
parents: 8349
diff changeset
  1694
        else if (type.isPrimitive())
2836ee97ee27 6839872: remove implementation inheritance from JSR 292 APIs
jrose
parents: 8349
diff changeset
  1695
            return ValueConversions.identity(Wrapper.forPrimitiveType(type));
2836ee97ee27 6839872: remove implementation inheritance from JSR 292 APIs
jrose
parents: 8349
diff changeset
  1696
        else
13423
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1697
            return MethodHandleImpl.makeReferenceIdentity(type);
7555
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1698
    }
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1699
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1700
    /**
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1701
     * Provides a target method handle with one or more <em>bound arguments</em>
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1702
     * in advance of the method handle's invocation.
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1703
     * The formal parameters to the target corresponding to the bound
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1704
     * arguments are called <em>bound parameters</em>.
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1705
     * Returns a new method handle which saves away the bound arguments.
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1706
     * When it is invoked, it receives arguments for any non-bound parameters,
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1707
     * binds the saved arguments to their corresponding parameters,
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1708
     * and calls the original target.
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1709
     * <p>
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1710
     * The type of the new method handle will drop the types for the bound
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1711
     * parameters from the original target type, since the new method handle
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1712
     * will no longer require those arguments to be supplied by its callers.
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1713
     * <p>
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1714
     * Each given argument object must match the corresponding bound parameter type.
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1715
     * If a bound parameter type is a primitive, the argument object
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1716
     * must be a wrapper, and will be unboxed to produce the primitive value.
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1717
     * <p>
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1718
     * The {@code pos} argument selects which parameters are to be bound.
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1719
     * It may range between zero and <i>N-L</i> (inclusively),
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1720
     * where <i>N</i> is the arity of the target method handle
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1721
     * and <i>L</i> is the length of the values array.
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1722
     * @param target the method handle to invoke after the argument is inserted
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1723
     * @param pos where to insert the argument (zero for the first)
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1724
     * @param values the series of arguments to insert
7555
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1725
     * @return a method handle which inserts an additional argument,
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1726
     *         before calling the original method handle
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1727
     * @throws NullPointerException if the target or the {@code values} array is null
7555
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1728
     * @see MethodHandle#bindTo
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1729
     */
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1730
    public static
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1731
    MethodHandle insertArguments(MethodHandle target, int pos, Object... values) {
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1732
        int insCount = values.length;
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1733
        MethodType oldType = target.type();
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1734
        int outargs = oldType.parameterCount();
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1735
        int inargs  = outargs - insCount;
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1736
        if (inargs < 0)
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1737
            throw newIllegalArgumentException("too many values to insert");
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1738
        if (pos < 0 || pos > inargs)
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1739
            throw newIllegalArgumentException("no argument type to append");
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1740
        MethodHandle result = target;
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1741
        for (int i = 0; i < insCount; i++) {
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1742
            Object value = values[i];
13423
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1743
            Class<?> ptype = oldType.parameterType(pos+i);
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1744
            if (ptype.isPrimitive()) {
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1745
                char btype = 'I';
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1746
                Wrapper w = Wrapper.forPrimitiveType(ptype);
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1747
                switch (w) {
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1748
                case LONG:    btype = 'J'; break;
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1749
                case FLOAT:   btype = 'F'; break;
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1750
                case DOUBLE:  btype = 'D'; break;
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1751
                }
13423
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1752
                // perform unboxing and/or primitive conversion
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1753
                value = w.convert(value, ptype);
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1754
                result = result.bindArgument(pos, btype, value);
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1755
                continue;
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1756
            }
13423
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1757
            value = ptype.cast(value);  // throw CCE if needed
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1758
            if (pos == 0) {
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1759
                result = result.bindReceiver(value);
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1760
            } else {
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1761
                result = result.bindArgument(pos, 'L', value);
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1762
            }
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1763
        }
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1764
        return result;
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1765
    }
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1766
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1767
    /**
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1768
     * Produces a method handle which will discard some dummy arguments
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1769
     * before calling some other specified <i>target</i> method handle.
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1770
     * The type of the new method handle will be the same as the target's type,
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1771
     * except it will also include the dummy argument types,
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1772
     * at some given position.
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1773
     * <p>
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1774
     * The {@code pos} argument may range between zero and <i>N</i>,
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1775
     * where <i>N</i> is the arity of the target.
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1776
     * If {@code pos} is zero, the dummy arguments will precede
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1777
     * the target's real arguments; if {@code pos} is <i>N</i>
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1778
     * they will come after.
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1779
     * <p>
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1780
     * <b>Example:</b>
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1781
     * <p><blockquote><pre>
8822
8145ab9f5f86 7012648: move JSR 292 to package java.lang.invoke and adjust names
jrose
parents: 8821
diff changeset
  1782
import static java.lang.invoke.MethodHandles.*;
8145ab9f5f86 7012648: move JSR 292 to package java.lang.invoke and adjust names
jrose
parents: 8821
diff changeset
  1783
import static java.lang.invoke.MethodType.*;
7562
a0ad195efe2c 7001424: implement JSR 292 EG adjustments, November 2010
jrose
parents: 7555
diff changeset
  1784
...
a0ad195efe2c 7001424: implement JSR 292 EG adjustments, November 2010
jrose
parents: 7555
diff changeset
  1785
MethodHandle cat = lookup().findVirtual(String.class,
a0ad195efe2c 7001424: implement JSR 292 EG adjustments, November 2010
jrose
parents: 7555
diff changeset
  1786
  "concat", methodType(String.class, String.class));
a0ad195efe2c 7001424: implement JSR 292 EG adjustments, November 2010
jrose
parents: 7555
diff changeset
  1787
assertEquals("xy", (String) cat.invokeExact("x", "y"));
8822
8145ab9f5f86 7012648: move JSR 292 to package java.lang.invoke and adjust names
jrose
parents: 8821
diff changeset
  1788
MethodType bigType = cat.type().insertParameterTypes(0, int.class, String.class);
8145ab9f5f86 7012648: move JSR 292 to package java.lang.invoke and adjust names
jrose
parents: 8821
diff changeset
  1789
MethodHandle d0 = dropArguments(cat, 0, bigType.parameterList().subList(0,2));
8145ab9f5f86 7012648: move JSR 292 to package java.lang.invoke and adjust names
jrose
parents: 8821
diff changeset
  1790
assertEquals(bigType, d0.type());
8145ab9f5f86 7012648: move JSR 292 to package java.lang.invoke and adjust names
jrose
parents: 8821
diff changeset
  1791
assertEquals("yz", (String) d0.invokeExact(123, "x", "y", "z"));
8145ab9f5f86 7012648: move JSR 292 to package java.lang.invoke and adjust names
jrose
parents: 8821
diff changeset
  1792
     * </pre></blockquote>
8145ab9f5f86 7012648: move JSR 292 to package java.lang.invoke and adjust names
jrose
parents: 8821
diff changeset
  1793
     * <p>
8145ab9f5f86 7012648: move JSR 292 to package java.lang.invoke and adjust names
jrose
parents: 8821
diff changeset
  1794
     * This method is also equivalent to the following code:
8145ab9f5f86 7012648: move JSR 292 to package java.lang.invoke and adjust names
jrose
parents: 8821
diff changeset
  1795
     * <p><blockquote><pre>
8145ab9f5f86 7012648: move JSR 292 to package java.lang.invoke and adjust names
jrose
parents: 8821
diff changeset
  1796
     * {@link #dropArguments(MethodHandle,int,Class...) dropArguments}(target, pos, valueTypes.toArray(new Class[0]))
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1797
     * </pre></blockquote>
7555
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1798
     * @param target the method handle to invoke after the arguments are dropped
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1799
     * @param valueTypes the type(s) of the argument(s) to drop
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1800
     * @param pos position of first argument to drop (zero for the leftmost)
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1801
     * @return a method handle which drops arguments of the given types,
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1802
     *         before calling the original method handle
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1803
     * @throws NullPointerException if the target is null,
8346
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1804
     *                              or if the {@code valueTypes} list or any of its elements is null
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1805
     * @throws IllegalArgumentException if any element of {@code valueTypes} is {@code void.class},
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1806
     *                  or if {@code pos} is negative or greater than the arity of the target,
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1807
     *                  or if the new method handle's type would have too many parameters
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1808
     */
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1809
    public static
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1810
    MethodHandle dropArguments(MethodHandle target, int pos, List<Class<?>> valueTypes) {
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1811
        MethodType oldType = target.type();  // get NPE
13423
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1812
        int dropped = valueTypes.size();
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1813
        MethodType.checkSlotCount(dropped);
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1814
        if (dropped == 0)  return target;
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1815
        int outargs = oldType.parameterCount();
13423
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1816
        int inargs  = outargs + dropped;
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1817
        if (pos < 0 || pos >= inargs)
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1818
            throw newIllegalArgumentException("no argument type to remove");
13423
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1819
        ArrayList<Class<?>> ptypes = new ArrayList<>(oldType.parameterList());
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1820
        ptypes.addAll(pos, valueTypes);
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1821
        MethodType newType = MethodType.methodType(oldType.returnType(), ptypes);
13423
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1822
        return target.dropArguments(newType, pos, dropped);
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1823
    }
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  1824
7555
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1825
    /**
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1826
     * Produces a method handle which will discard some dummy arguments
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1827
     * before calling some other specified <i>target</i> method handle.
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1828
     * The type of the new method handle will be the same as the target's type,
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1829
     * except it will also include the dummy argument types,
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1830
     * at some given position.
8822
8145ab9f5f86 7012648: move JSR 292 to package java.lang.invoke and adjust names
jrose
parents: 8821
diff changeset
  1831
     * <p>
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1832
     * The {@code pos} argument may range between zero and <i>N</i>,
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1833
     * where <i>N</i> is the arity of the target.
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1834
     * If {@code pos} is zero, the dummy arguments will precede
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1835
     * the target's real arguments; if {@code pos} is <i>N</i>
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1836
     * they will come after.
8822
8145ab9f5f86 7012648: move JSR 292 to package java.lang.invoke and adjust names
jrose
parents: 8821
diff changeset
  1837
     * <p>
8145ab9f5f86 7012648: move JSR 292 to package java.lang.invoke and adjust names
jrose
parents: 8821
diff changeset
  1838
     * <b>Example:</b>
8145ab9f5f86 7012648: move JSR 292 to package java.lang.invoke and adjust names
jrose
parents: 8821
diff changeset
  1839
     * <p><blockquote><pre>
8145ab9f5f86 7012648: move JSR 292 to package java.lang.invoke and adjust names
jrose
parents: 8821
diff changeset
  1840
import static java.lang.invoke.MethodHandles.*;
8145ab9f5f86 7012648: move JSR 292 to package java.lang.invoke and adjust names
jrose
parents: 8821
diff changeset
  1841
import static java.lang.invoke.MethodType.*;
8145ab9f5f86 7012648: move JSR 292 to package java.lang.invoke and adjust names
jrose
parents: 8821
diff changeset
  1842
...
8145ab9f5f86 7012648: move JSR 292 to package java.lang.invoke and adjust names
jrose
parents: 8821
diff changeset
  1843
MethodHandle cat = lookup().findVirtual(String.class,
8145ab9f5f86 7012648: move JSR 292 to package java.lang.invoke and adjust names
jrose
parents: 8821
diff changeset
  1844
  "concat", methodType(String.class, String.class));
8145ab9f5f86 7012648: move JSR 292 to package java.lang.invoke and adjust names
jrose
parents: 8821
diff changeset
  1845
assertEquals("xy", (String) cat.invokeExact("x", "y"));
8145ab9f5f86 7012648: move JSR 292 to package java.lang.invoke and adjust names
jrose
parents: 8821
diff changeset
  1846
MethodHandle d0 = dropArguments(cat, 0, String.class);
8145ab9f5f86 7012648: move JSR 292 to package java.lang.invoke and adjust names
jrose
parents: 8821
diff changeset
  1847
assertEquals("yz", (String) d0.invokeExact("x", "y", "z"));
8145ab9f5f86 7012648: move JSR 292 to package java.lang.invoke and adjust names
jrose
parents: 8821
diff changeset
  1848
MethodHandle d1 = dropArguments(cat, 1, String.class);
8145ab9f5f86 7012648: move JSR 292 to package java.lang.invoke and adjust names
jrose
parents: 8821
diff changeset
  1849
assertEquals("xz", (String) d1.invokeExact("x", "y", "z"));
8145ab9f5f86 7012648: move JSR 292 to package java.lang.invoke and adjust names
jrose
parents: 8821
diff changeset
  1850
MethodHandle d2 = dropArguments(cat, 2, String.class);
8145ab9f5f86 7012648: move JSR 292 to package java.lang.invoke and adjust names
jrose
parents: 8821
diff changeset
  1851
assertEquals("xy", (String) d2.invokeExact("x", "y", "z"));
8145ab9f5f86 7012648: move JSR 292 to package java.lang.invoke and adjust names
jrose
parents: 8821
diff changeset
  1852
MethodHandle d12 = dropArguments(cat, 1, int.class, boolean.class);
8145ab9f5f86 7012648: move JSR 292 to package java.lang.invoke and adjust names
jrose
parents: 8821
diff changeset
  1853
assertEquals("xz", (String) d12.invokeExact("x", 12, true, "z"));
8145ab9f5f86 7012648: move JSR 292 to package java.lang.invoke and adjust names
jrose
parents: 8821
diff changeset
  1854
     * </pre></blockquote>
8145ab9f5f86 7012648: move JSR 292 to package java.lang.invoke and adjust names
jrose
parents: 8821
diff changeset
  1855
     * <p>
8145ab9f5f86 7012648: move JSR 292 to package java.lang.invoke and adjust names
jrose
parents: 8821
diff changeset
  1856
     * This method is also equivalent to the following code:
8145ab9f5f86 7012648: move JSR 292 to package java.lang.invoke and adjust names
jrose
parents: 8821
diff changeset
  1857
     * <p><blockquote><pre>
7555
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1858
     * {@link #dropArguments(MethodHandle,int,List) dropArguments}(target, pos, Arrays.asList(valueTypes))
8822
8145ab9f5f86 7012648: move JSR 292 to package java.lang.invoke and adjust names
jrose
parents: 8821
diff changeset
  1859
     * </pre></blockquote>
7555
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1860
     * @param target the method handle to invoke after the arguments are dropped
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1861
     * @param valueTypes the type(s) of the argument(s) to drop
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1862
     * @param pos position of first argument to drop (zero for the leftmost)
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1863
     * @return a method handle which drops arguments of the given types,
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1864
     *         before calling the original method handle
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1865
     * @throws NullPointerException if the target is null,
8346
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1866
     *                              or if the {@code valueTypes} array or any of its elements is null
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1867
     * @throws IllegalArgumentException if any element of {@code valueTypes} is {@code void.class},
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1868
     *                  or if {@code pos} is negative or greater than the arity of the target,
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1869
     *                  or if the new method handle's type would have too many parameters
7555
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1870
     */
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1871
    public static
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1872
    MethodHandle dropArguments(MethodHandle target, int pos, Class<?>... valueTypes) {
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1873
        return dropArguments(target, pos, Arrays.asList(valueTypes));
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1874
    }
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1875
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1876
    /**
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1877
     * Adapts a target method handle by pre-processing
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1878
     * one or more of its arguments, each with its own unary filter function,
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1879
     * and then calling the target with each pre-processed argument
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1880
     * replaced by the result of its corresponding filter function.
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1881
     * <p>
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1882
     * The pre-processing is performed by one or more method handles,
7555
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1883
     * specified in the elements of the {@code filters} array.
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1884
     * The first element of the filter array corresponds to the {@code pos}
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1885
     * argument of the target, and so on in sequence.
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1886
     * <p>
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1887
     * Null arguments in the array are treated as identity functions,
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1888
     * and the corresponding arguments left unchanged.
8346
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1889
     * (If there are no non-null elements in the array, the original target is returned.)
7555
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1890
     * Each filter is applied to the corresponding argument of the adapter.
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1891
     * <p>
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1892
     * If a filter {@code F} applies to the {@code N}th argument of
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1893
     * the target, then {@code F} must be a method handle which
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1894
     * takes exactly one argument.  The type of {@code F}'s sole argument
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1895
     * replaces the corresponding argument type of the target
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1896
     * in the resulting adapted method handle.
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1897
     * The return type of {@code F} must be identical to the corresponding
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1898
     * parameter type of the target.
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1899
     * <p>
7555
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1900
     * It is an error if there are elements of {@code filters}
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1901
     * (null or not)
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1902
     * which do not correspond to argument positions in the target.
7555
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1903
     * <b>Example:</b>
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1904
     * <p><blockquote><pre>
8822
8145ab9f5f86 7012648: move JSR 292 to package java.lang.invoke and adjust names
jrose
parents: 8821
diff changeset
  1905
import static java.lang.invoke.MethodHandles.*;
8145ab9f5f86 7012648: move JSR 292 to package java.lang.invoke and adjust names
jrose
parents: 8821
diff changeset
  1906
import static java.lang.invoke.MethodType.*;
7555
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1907
...
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1908
MethodHandle cat = lookup().findVirtual(String.class,
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1909
  "concat", methodType(String.class, String.class));
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1910
MethodHandle upcase = lookup().findVirtual(String.class,
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1911
  "toUpperCase", methodType(String.class));
7562
a0ad195efe2c 7001424: implement JSR 292 EG adjustments, November 2010
jrose
parents: 7555
diff changeset
  1912
assertEquals("xy", (String) cat.invokeExact("x", "y"));
7555
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1913
MethodHandle f0 = filterArguments(cat, 0, upcase);
7562
a0ad195efe2c 7001424: implement JSR 292 EG adjustments, November 2010
jrose
parents: 7555
diff changeset
  1914
assertEquals("Xy", (String) f0.invokeExact("x", "y")); // Xy
7555
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1915
MethodHandle f1 = filterArguments(cat, 1, upcase);
7562
a0ad195efe2c 7001424: implement JSR 292 EG adjustments, November 2010
jrose
parents: 7555
diff changeset
  1916
assertEquals("xY", (String) f1.invokeExact("x", "y")); // xY
7555
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1917
MethodHandle f2 = filterArguments(cat, 0, upcase, upcase);
7562
a0ad195efe2c 7001424: implement JSR 292 EG adjustments, November 2010
jrose
parents: 7555
diff changeset
  1918
assertEquals("XY", (String) f2.invokeExact("x", "y")); // XY
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1919
     * </pre></blockquote>
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1920
     * <p> Here is pseudocode for the resulting adapter:
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1921
     * <blockquote><pre>
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1922
     * V target(P... p, A[i]... a[i], B... b);
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1923
     * A[i] filter[i](V[i]);
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1924
     * T adapter(P... p, V[i]... v[i], B... b) {
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1925
     *   return target(p..., f[i](v[i])..., b...);
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1926
     * }
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1927
     * </pre></blockquote>
8346
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1928
     *
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1929
     * @param target the method handle to invoke after arguments are filtered
7555
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1930
     * @param pos the position of the first argument to filter
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1931
     * @param filters method handles to call initially on filtered arguments
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1932
     * @return method handle which incorporates the specified argument filtering logic
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1933
     * @throws NullPointerException if the target is null
8346
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1934
     *                              or if the {@code filters} array is null
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1935
     * @throws IllegalArgumentException if a non-null element of {@code filters}
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1936
     *          does not match a corresponding argument type of target as described above,
8346
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1937
     *          or if the {@code pos+filters.length} is greater than {@code target.type().parameterCount()}
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1938
     */
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1939
    public static
7555
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1940
    MethodHandle filterArguments(MethodHandle target, int pos, MethodHandle... filters) {
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1941
        MethodType targetType = target.type();
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1942
        MethodHandle adapter = target;
9646
5ebbe5ab084f 6939861: JVM should handle more conversion operations
jrose
parents: 9645
diff changeset
  1943
        MethodType adapterType = null;
5ebbe5ab084f 6939861: JVM should handle more conversion operations
jrose
parents: 9645
diff changeset
  1944
        assert((adapterType = targetType) != null);
7555
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1945
        int maxPos = targetType.parameterCount();
8346
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1946
        if (pos + filters.length > maxPos)
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1947
            throw newIllegalArgumentException("too many filters");
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1948
        int curPos = pos-1;  // pre-incremented
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1949
        for (MethodHandle filter : filters) {
8346
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1950
            curPos += 1;
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  1951
            if (filter == null)  continue;  // ignore null elements of filters
9646
5ebbe5ab084f 6939861: JVM should handle more conversion operations
jrose
parents: 9645
diff changeset
  1952
            adapter = filterArgument(adapter, curPos, filter);
5ebbe5ab084f 6939861: JVM should handle more conversion operations
jrose
parents: 9645
diff changeset
  1953
            assert((adapterType = adapterType.changeParameterType(curPos, filter.type().parameterType(0))) != null);
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1954
        }
9646
5ebbe5ab084f 6939861: JVM should handle more conversion operations
jrose
parents: 9645
diff changeset
  1955
        assert(adapterType.equals(adapter.type()));
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1956
        return adapter;
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1957
    }
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  1958
9646
5ebbe5ab084f 6939861: JVM should handle more conversion operations
jrose
parents: 9645
diff changeset
  1959
    /*non-public*/ static
5ebbe5ab084f 6939861: JVM should handle more conversion operations
jrose
parents: 9645
diff changeset
  1960
    MethodHandle filterArgument(MethodHandle target, int pos, MethodHandle filter) {
5ebbe5ab084f 6939861: JVM should handle more conversion operations
jrose
parents: 9645
diff changeset
  1961
        MethodType targetType = target.type();
5ebbe5ab084f 6939861: JVM should handle more conversion operations
jrose
parents: 9645
diff changeset
  1962
        MethodType filterType = filter.type();
5ebbe5ab084f 6939861: JVM should handle more conversion operations
jrose
parents: 9645
diff changeset
  1963
        if (filterType.parameterCount() != 1
5ebbe5ab084f 6939861: JVM should handle more conversion operations
jrose
parents: 9645
diff changeset
  1964
            || filterType.returnType() != targetType.parameterType(pos))
5ebbe5ab084f 6939861: JVM should handle more conversion operations
jrose
parents: 9645
diff changeset
  1965
            throw newIllegalArgumentException("target and filter types do not match", targetType, filterType);
13423
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  1966
        return MethodHandleImpl.makeCollectArguments(target, filter, pos, false);
9646
5ebbe5ab084f 6939861: JVM should handle more conversion operations
jrose
parents: 9645
diff changeset
  1967
    }
5ebbe5ab084f 6939861: JVM should handle more conversion operations
jrose
parents: 9645
diff changeset
  1968
13610
28122b96858e 7191102: nightly failures after JSR 292 lazy method handle update (round 3)
jrose
parents: 13423
diff changeset
  1969
    // FIXME: Make this public in M1.
28122b96858e 7191102: nightly failures after JSR 292 lazy method handle update (round 3)
jrose
parents: 13423
diff changeset
  1970
    /*non-public*/ static
28122b96858e 7191102: nightly failures after JSR 292 lazy method handle update (round 3)
jrose
parents: 13423
diff changeset
  1971
    MethodHandle collectArguments(MethodHandle target, int pos, MethodHandle collector) {
28122b96858e 7191102: nightly failures after JSR 292 lazy method handle update (round 3)
jrose
parents: 13423
diff changeset
  1972
        MethodType targetType = target.type();
28122b96858e 7191102: nightly failures after JSR 292 lazy method handle update (round 3)
jrose
parents: 13423
diff changeset
  1973
        MethodType filterType = collector.type();
28122b96858e 7191102: nightly failures after JSR 292 lazy method handle update (round 3)
jrose
parents: 13423
diff changeset
  1974
        if (filterType.returnType() != void.class &&
28122b96858e 7191102: nightly failures after JSR 292 lazy method handle update (round 3)
jrose
parents: 13423
diff changeset
  1975
            filterType.returnType() != targetType.parameterType(pos))
28122b96858e 7191102: nightly failures after JSR 292 lazy method handle update (round 3)
jrose
parents: 13423
diff changeset
  1976
            throw newIllegalArgumentException("target and filter types do not match", targetType, filterType);
28122b96858e 7191102: nightly failures after JSR 292 lazy method handle update (round 3)
jrose
parents: 13423
diff changeset
  1977
        return MethodHandleImpl.makeCollectArguments(target, collector, pos, false);
28122b96858e 7191102: nightly failures after JSR 292 lazy method handle update (round 3)
jrose
parents: 13423
diff changeset
  1978
    }
28122b96858e 7191102: nightly failures after JSR 292 lazy method handle update (round 3)
jrose
parents: 13423
diff changeset
  1979
7562
a0ad195efe2c 7001424: implement JSR 292 EG adjustments, November 2010
jrose
parents: 7555
diff changeset
  1980
    /**
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1981
     * Adapts a target method handle by post-processing
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1982
     * its return value (if any) with a filter (another method handle).
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1983
     * The result of the filter is returned from the adapter.
7555
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1984
     * <p>
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1985
     * If the target returns a value, the filter must accept that value as
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1986
     * its only argument.
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1987
     * If the target returns void, the filter must accept no arguments.
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1988
     * <p>
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1989
     * The return type of the filter
7555
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1990
     * replaces the return type of the target
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1991
     * in the resulting adapted method handle.
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  1992
     * The argument type of the filter (if any) must be identical to the
7555
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1993
     * return type of the target.
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1994
     * <b>Example:</b>
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1995
     * <p><blockquote><pre>
8822
8145ab9f5f86 7012648: move JSR 292 to package java.lang.invoke and adjust names
jrose
parents: 8821
diff changeset
  1996
import static java.lang.invoke.MethodHandles.*;
8145ab9f5f86 7012648: move JSR 292 to package java.lang.invoke and adjust names
jrose
parents: 8821
diff changeset
  1997
import static java.lang.invoke.MethodType.*;
7555
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1998
...
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  1999
MethodHandle cat = lookup().findVirtual(String.class,
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  2000
  "concat", methodType(String.class, String.class));
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  2001
MethodHandle length = lookup().findVirtual(String.class,
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  2002
  "length", methodType(int.class));
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  2003
System.out.println((String) cat.invokeExact("x", "y")); // xy
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  2004
MethodHandle f0 = filterReturnValue(cat, length);
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  2005
System.out.println((int) f0.invokeExact("x", "y")); // 2
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  2006
     * </pre></blockquote>
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2007
     * <p> Here is pseudocode for the resulting adapter:
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2008
     * <blockquote><pre>
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2009
     * V target(A...);
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2010
     * T filter(V);
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2011
     * T adapter(A... a) {
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2012
     *   V v = target(a...);
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2013
     *   return filter(v);
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2014
     * }
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2015
     * // and if the target has a void return:
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2016
     * void target2(A...);
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2017
     * T filter2();
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2018
     * T adapter2(A... a) {
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2019
     *   target2(a...);
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2020
     *   return filter2();
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2021
     * }
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2022
     * // and if the filter has a void return:
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2023
     * V target3(A...);
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2024
     * void filter3(V);
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2025
     * void adapter3(A... a) {
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2026
     *   V v = target3(a...);
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2027
     *   filter3(v);
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2028
     * }
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2029
     * </pre></blockquote>
7555
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  2030
     * @param target the method handle to invoke before filtering the return value
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  2031
     * @param filter method handle to call on the return value
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  2032
     * @return method handle which incorporates the specified return value filtering logic
8346
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  2033
     * @throws NullPointerException if either argument is null
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2034
     * @throws IllegalArgumentException if the argument list of {@code filter}
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2035
     *          does not match the return type of target as described above
7554
8a0ad9757002 6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
jrose
parents: 7053
diff changeset
  2036
     */
7555
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  2037
    public static
7554
8a0ad9757002 6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
jrose
parents: 7053
diff changeset
  2038
    MethodHandle filterReturnValue(MethodHandle target, MethodHandle filter) {
8a0ad9757002 6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
jrose
parents: 7053
diff changeset
  2039
        MethodType targetType = target.type();
8a0ad9757002 6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
jrose
parents: 7053
diff changeset
  2040
        MethodType filterType = filter.type();
9646
5ebbe5ab084f 6939861: JVM should handle more conversion operations
jrose
parents: 9645
diff changeset
  2041
        Class<?> rtype = targetType.returnType();
5ebbe5ab084f 6939861: JVM should handle more conversion operations
jrose
parents: 9645
diff changeset
  2042
        int filterValues = filterType.parameterCount();
5ebbe5ab084f 6939861: JVM should handle more conversion operations
jrose
parents: 9645
diff changeset
  2043
        if (filterValues == 0
5ebbe5ab084f 6939861: JVM should handle more conversion operations
jrose
parents: 9645
diff changeset
  2044
                ? (rtype != void.class)
5ebbe5ab084f 6939861: JVM should handle more conversion operations
jrose
parents: 9645
diff changeset
  2045
                : (rtype != filterType.parameterType(0)))
5ebbe5ab084f 6939861: JVM should handle more conversion operations
jrose
parents: 9645
diff changeset
  2046
            throw newIllegalArgumentException("target and filter types do not match", target, filter);
8346
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  2047
        // result = fold( lambda(retval, arg...) { filter(retval) },
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  2048
        //                lambda(        arg...) { target(arg...) } )
13423
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  2049
        return MethodHandleImpl.makeCollectArguments(filter, target, 0, false);
7554
8a0ad9757002 6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
jrose
parents: 7053
diff changeset
  2050
    }
8a0ad9757002 6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
jrose
parents: 7053
diff changeset
  2051
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2052
    /**
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2053
     * Adapts a target method handle by pre-processing
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2054
     * some of its arguments, and then calling the target with
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2055
     * the result of the pre-processing, inserted into the original
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2056
     * sequence of arguments.
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2057
     * <p>
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2058
     * The pre-processing is performed by {@code combiner}, a second method handle.
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2059
     * Of the arguments passed to the adapter, the first {@code N} arguments
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2060
     * are copied to the combiner, which is then called.
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2061
     * (Here, {@code N} is defined as the parameter count of the combiner.)
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2062
     * After this, control passes to the target, with any result
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2063
     * from the combiner inserted before the original {@code N} incoming
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2064
     * arguments.
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2065
     * <p>
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2066
     * If the combiner returns a value, the first parameter type of the target
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2067
     * must be identical with the return type of the combiner, and the next
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2068
     * {@code N} parameter types of the target must exactly match the parameters
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2069
     * of the combiner.
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2070
     * <p>
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2071
     * If the combiner has a void return, no result will be inserted,
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2072
     * and the first {@code N} parameter types of the target
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2073
     * must exactly match the parameters of the combiner.
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2074
     * <p>
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2075
     * The resulting adapter is the same type as the target, except that the
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2076
     * first parameter type is dropped,
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2077
     * if it corresponds to the result of the combiner.
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2078
     * <p>
7555
a279ebc3b25c 6981777: implement JSR 292 EG adjustments from summer 2010
jrose
parents: 7554
diff changeset
  2079
     * (Note that {@link #dropArguments(MethodHandle,int,List) dropArguments} can be used to remove any arguments
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2080
     * that either the combiner or the target does not wish to receive.
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2081
     * If some of the incoming arguments are destined only for the combiner,
8346
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  2082
     * consider using {@link MethodHandle#asCollector asCollector} instead, since those
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2083
     * arguments will not need to be live on the stack on entry to the
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2084
     * target.)
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2085
     * <b>Example:</b>
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2086
     * <p><blockquote><pre>
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2087
import static java.lang.invoke.MethodHandles.*;
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2088
import static java.lang.invoke.MethodType.*;
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2089
...
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2090
MethodHandle trace = publicLookup().findVirtual(java.io.PrintStream.class,
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2091
  "println", methodType(void.class, String.class))
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2092
    .bindTo(System.out);
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2093
MethodHandle cat = lookup().findVirtual(String.class,
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2094
  "concat", methodType(String.class, String.class));
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2095
assertEquals("boojum", (String) cat.invokeExact("boo", "jum"));
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2096
MethodHandle catTrace = foldArguments(cat, trace);
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2097
// also prints "boo":
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2098
assertEquals("boojum", (String) catTrace.invokeExact("boo", "jum"));
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2099
     * </pre></blockquote>
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2100
     * <p> Here is pseudocode for the resulting adapter:
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2101
     * <blockquote><pre>
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2102
     * // there are N arguments in A...
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2103
     * T target(V, A[N]..., B...);
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2104
     * V combiner(A...);
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2105
     * T adapter(A... a, B... b) {
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2106
     *   V v = combiner(a...);
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2107
     *   return target(v, a..., b...);
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2108
     * }
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2109
     * // and if the combiner has a void return:
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2110
     * T target2(A[N]..., B...);
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2111
     * void combiner2(A...);
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2112
     * T adapter2(A... a, B... b) {
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2113
     *   combiner2(a...);
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2114
     *   return target2(a..., b...);
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2115
     * }
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2116
     * </pre></blockquote>
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2117
     * @param target the method handle to invoke after arguments are combined
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2118
     * @param combiner method handle to call initially on the incoming arguments
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2119
     * @return method handle which incorporates the specified argument folding logic
8346
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  2120
     * @throws NullPointerException if either argument is null
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2121
     * @throws IllegalArgumentException if {@code combiner}'s return type
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2122
     *          is non-void and not the same as the first argument type of
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2123
     *          the target, or if the initial {@code N} argument types
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2124
     *          of the target
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2125
     *          (skipping one matching the {@code combiner}'s return type)
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2126
     *          are not identical with the argument types of {@code combiner}
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2127
     */
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2128
    public static
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2129
    MethodHandle foldArguments(MethodHandle target, MethodHandle combiner) {
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2130
        int pos = 0;
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2131
        MethodType targetType = target.type();
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2132
        MethodType combinerType = combiner.type();
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2133
        int foldPos = pos;
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2134
        int foldArgs = combinerType.parameterCount();
9646
5ebbe5ab084f 6939861: JVM should handle more conversion operations
jrose
parents: 9645
diff changeset
  2135
        int foldVals = combinerType.returnType() == void.class ? 0 : 1;
5ebbe5ab084f 6939861: JVM should handle more conversion operations
jrose
parents: 9645
diff changeset
  2136
        int afterInsertPos = foldPos + foldVals;
5ebbe5ab084f 6939861: JVM should handle more conversion operations
jrose
parents: 9645
diff changeset
  2137
        boolean ok = (targetType.parameterCount() >= afterInsertPos + foldArgs);
5ebbe5ab084f 6939861: JVM should handle more conversion operations
jrose
parents: 9645
diff changeset
  2138
        if (ok && !(combinerType.parameterList()
5ebbe5ab084f 6939861: JVM should handle more conversion operations
jrose
parents: 9645
diff changeset
  2139
                    .equals(targetType.parameterList().subList(afterInsertPos,
5ebbe5ab084f 6939861: JVM should handle more conversion operations
jrose
parents: 9645
diff changeset
  2140
                                                               afterInsertPos + foldArgs))))
7554
8a0ad9757002 6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
jrose
parents: 7053
diff changeset
  2141
            ok = false;
9646
5ebbe5ab084f 6939861: JVM should handle more conversion operations
jrose
parents: 9645
diff changeset
  2142
        if (ok && foldVals != 0 && !combinerType.returnType().equals(targetType.parameterType(0)))
7554
8a0ad9757002 6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
jrose
parents: 7053
diff changeset
  2143
            ok = false;
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2144
        if (!ok)
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2145
            throw misMatchedTypes("target and combiner types", targetType, combinerType);
9646
5ebbe5ab084f 6939861: JVM should handle more conversion operations
jrose
parents: 9645
diff changeset
  2146
        MethodType newType = targetType.dropParameterTypes(foldPos, afterInsertPos);
13423
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  2147
        return MethodHandleImpl.makeCollectArguments(target, combiner, foldPos, true);
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2148
    }
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2149
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  2150
    /**
8822
8145ab9f5f86 7012648: move JSR 292 to package java.lang.invoke and adjust names
jrose
parents: 8821
diff changeset
  2151
     * Makes a method handle which adapts a target method handle,
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  2152
     * by guarding it with a test, a boolean-valued method handle.
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  2153
     * If the guard fails, a fallback handle is called instead.
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  2154
     * All three method handles must have the same corresponding
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  2155
     * argument and return types, except that the return type
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2156
     * of the test must be boolean, and the test is allowed
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2157
     * to have fewer arguments than the other two method handles.
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  2158
     * <p> Here is pseudocode for the resulting adapter:
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  2159
     * <blockquote><pre>
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  2160
     * boolean test(A...);
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2161
     * T target(A...,B...);
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2162
     * T fallback(A...,B...);
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2163
     * T adapter(A... a,B... b) {
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  2164
     *   if (test(a...))
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2165
     *     return target(a..., b...);
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  2166
     *   else
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2167
     *     return fallback(a..., b...);
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  2168
     * }
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  2169
     * </pre></blockquote>
7562
a0ad195efe2c 7001424: implement JSR 292 EG adjustments, November 2010
jrose
parents: 7555
diff changeset
  2170
     * Note that the test arguments ({@code a...} in the pseudocode) cannot
a0ad195efe2c 7001424: implement JSR 292 EG adjustments, November 2010
jrose
parents: 7555
diff changeset
  2171
     * be modified by execution of the test, and so are passed unchanged
a0ad195efe2c 7001424: implement JSR 292 EG adjustments, November 2010
jrose
parents: 7555
diff changeset
  2172
     * from the caller to the target or fallback as appropriate.
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  2173
     * @param test method handle used for test, must return boolean
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  2174
     * @param target method handle to call if test passes
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  2175
     * @param fallback method handle to call if test fails
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  2176
     * @return method handle which incorporates the specified if/then/else logic
8346
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  2177
     * @throws NullPointerException if any argument is null
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  2178
     * @throws IllegalArgumentException if {@code test} does not return boolean,
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  2179
     *          or if all three method types do not match (with the return
9752
88ab34b6da6d 7032323: code changes for JSR 292 EG adjustments to API, through Public Review
jrose
parents: 9731
diff changeset
  2180
     *          type of {@code test} changed to match that of the target).
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  2181
     */
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  2182
    public static
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  2183
    MethodHandle guardWithTest(MethodHandle test,
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  2184
                               MethodHandle target,
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  2185
                               MethodHandle fallback) {
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2186
        MethodType gtype = test.type();
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2187
        MethodType ttype = target.type();
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2188
        MethodType ftype = fallback.type();
7562
a0ad195efe2c 7001424: implement JSR 292 EG adjustments, November 2010
jrose
parents: 7555
diff changeset
  2189
        if (!ttype.equals(ftype))
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2190
            throw misMatchedTypes("target and fallback types", ttype, ftype);
7562
a0ad195efe2c 7001424: implement JSR 292 EG adjustments, November 2010
jrose
parents: 7555
diff changeset
  2191
        if (gtype.returnType() != boolean.class)
a0ad195efe2c 7001424: implement JSR 292 EG adjustments, November 2010
jrose
parents: 7555
diff changeset
  2192
            throw newIllegalArgumentException("guard type is not a predicate "+gtype);
a0ad195efe2c 7001424: implement JSR 292 EG adjustments, November 2010
jrose
parents: 7555
diff changeset
  2193
        List<Class<?>> targs = ttype.parameterList();
a0ad195efe2c 7001424: implement JSR 292 EG adjustments, November 2010
jrose
parents: 7555
diff changeset
  2194
        List<Class<?>> gargs = gtype.parameterList();
a0ad195efe2c 7001424: implement JSR 292 EG adjustments, November 2010
jrose
parents: 7555
diff changeset
  2195
        if (!targs.equals(gargs)) {
a0ad195efe2c 7001424: implement JSR 292 EG adjustments, November 2010
jrose
parents: 7555
diff changeset
  2196
            int gpc = gargs.size(), tpc = targs.size();
a0ad195efe2c 7001424: implement JSR 292 EG adjustments, November 2010
jrose
parents: 7555
diff changeset
  2197
            if (gpc >= tpc || !targs.subList(0, gpc).equals(gargs))
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2198
                throw misMatchedTypes("target and test types", ttype, gtype);
7562
a0ad195efe2c 7001424: implement JSR 292 EG adjustments, November 2010
jrose
parents: 7555
diff changeset
  2199
            test = dropArguments(test, gpc, targs.subList(gpc, tpc));
a0ad195efe2c 7001424: implement JSR 292 EG adjustments, November 2010
jrose
parents: 7555
diff changeset
  2200
            gtype = test.type();
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2201
        }
8821
2836ee97ee27 6839872: remove implementation inheritance from JSR 292 APIs
jrose
parents: 8349
diff changeset
  2202
        return MethodHandleImpl.makeGuardWithTest(test, target, fallback);
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  2203
    }
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  2204
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2205
    static RuntimeException misMatchedTypes(String what, MethodType t1, MethodType t2) {
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2206
        return newIllegalArgumentException(what + " must match: " + t1 + " != " + t2);
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2207
    }
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2208
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  2209
    /**
8822
8145ab9f5f86 7012648: move JSR 292 to package java.lang.invoke and adjust names
jrose
parents: 8821
diff changeset
  2210
     * Makes a method handle which adapts a target method handle,
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2211
     * by running it inside an exception handler.
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2212
     * If the target returns normally, the adapter returns that value.
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2213
     * If an exception matching the specified type is thrown, the fallback
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2214
     * handle is called instead on the exception, plus the original arguments.
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  2215
     * <p>
7562
a0ad195efe2c 7001424: implement JSR 292 EG adjustments, November 2010
jrose
parents: 7555
diff changeset
  2216
     * The target and handler must have the same corresponding
a0ad195efe2c 7001424: implement JSR 292 EG adjustments, November 2010
jrose
parents: 7555
diff changeset
  2217
     * argument and return types, except that handler may omit trailing arguments
a0ad195efe2c 7001424: implement JSR 292 EG adjustments, November 2010
jrose
parents: 7555
diff changeset
  2218
     * (similarly to the predicate in {@link #guardWithTest guardWithTest}).
a0ad195efe2c 7001424: implement JSR 292 EG adjustments, November 2010
jrose
parents: 7555
diff changeset
  2219
     * Also, the handler must have an extra leading parameter of {@code exType} or a supertype.
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  2220
     * <p> Here is pseudocode for the resulting adapter:
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  2221
     * <blockquote><pre>
7562
a0ad195efe2c 7001424: implement JSR 292 EG adjustments, November 2010
jrose
parents: 7555
diff changeset
  2222
     * T target(A..., B...);
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2223
     * T handler(ExType, A...);
7562
a0ad195efe2c 7001424: implement JSR 292 EG adjustments, November 2010
jrose
parents: 7555
diff changeset
  2224
     * T adapter(A... a, B... b) {
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2225
     *   try {
7562
a0ad195efe2c 7001424: implement JSR 292 EG adjustments, November 2010
jrose
parents: 7555
diff changeset
  2226
     *     return target(a..., b...);
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2227
     *   } catch (ExType ex) {
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2228
     *     return handler(ex, a...);
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2229
     *   }
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  2230
     * }
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  2231
     * </pre></blockquote>
7562
a0ad195efe2c 7001424: implement JSR 292 EG adjustments, November 2010
jrose
parents: 7555
diff changeset
  2232
     * Note that the saved arguments ({@code a...} in the pseudocode) cannot
a0ad195efe2c 7001424: implement JSR 292 EG adjustments, November 2010
jrose
parents: 7555
diff changeset
  2233
     * be modified by execution of the target, and so are passed unchanged
a0ad195efe2c 7001424: implement JSR 292 EG adjustments, November 2010
jrose
parents: 7555
diff changeset
  2234
     * from the caller to the handler, if the handler is invoked.
a0ad195efe2c 7001424: implement JSR 292 EG adjustments, November 2010
jrose
parents: 7555
diff changeset
  2235
     * <p>
a0ad195efe2c 7001424: implement JSR 292 EG adjustments, November 2010
jrose
parents: 7555
diff changeset
  2236
     * The target and handler must return the same type, even if the handler
a0ad195efe2c 7001424: implement JSR 292 EG adjustments, November 2010
jrose
parents: 7555
diff changeset
  2237
     * always throws.  (This might happen, for instance, because the handler
a0ad195efe2c 7001424: implement JSR 292 EG adjustments, November 2010
jrose
parents: 7555
diff changeset
  2238
     * is simulating a {@code finally} clause).
a0ad195efe2c 7001424: implement JSR 292 EG adjustments, November 2010
jrose
parents: 7555
diff changeset
  2239
     * To create such a throwing handler, compose the handler creation logic
a0ad195efe2c 7001424: implement JSR 292 EG adjustments, November 2010
jrose
parents: 7555
diff changeset
  2240
     * with {@link #throwException throwException},
a0ad195efe2c 7001424: implement JSR 292 EG adjustments, November 2010
jrose
parents: 7555
diff changeset
  2241
     * in order to create a method handle of the correct return type.
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2242
     * @param target method handle to call
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2243
     * @param exType the type of exception which the handler will catch
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2244
     * @param handler method handle to call if a matching exception is thrown
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2245
     * @return method handle which incorporates the specified try/catch logic
8346
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  2246
     * @throws NullPointerException if any argument is null
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2247
     * @throws IllegalArgumentException if {@code handler} does not accept
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2248
     *          the given exception type, or if the method handle types do
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2249
     *          not match in their return types and their
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2250
     *          corresponding parameters
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  2251
     */
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  2252
    public static
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2253
    MethodHandle catchException(MethodHandle target,
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2254
                                Class<? extends Throwable> exType,
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2255
                                MethodHandle handler) {
7562
a0ad195efe2c 7001424: implement JSR 292 EG adjustments, November 2010
jrose
parents: 7555
diff changeset
  2256
        MethodType ttype = target.type();
a0ad195efe2c 7001424: implement JSR 292 EG adjustments, November 2010
jrose
parents: 7555
diff changeset
  2257
        MethodType htype = handler.type();
a0ad195efe2c 7001424: implement JSR 292 EG adjustments, November 2010
jrose
parents: 7555
diff changeset
  2258
        if (htype.parameterCount() < 1 ||
a0ad195efe2c 7001424: implement JSR 292 EG adjustments, November 2010
jrose
parents: 7555
diff changeset
  2259
            !htype.parameterType(0).isAssignableFrom(exType))
a0ad195efe2c 7001424: implement JSR 292 EG adjustments, November 2010
jrose
parents: 7555
diff changeset
  2260
            throw newIllegalArgumentException("handler does not accept exception type "+exType);
a0ad195efe2c 7001424: implement JSR 292 EG adjustments, November 2010
jrose
parents: 7555
diff changeset
  2261
        if (htype.returnType() != ttype.returnType())
a0ad195efe2c 7001424: implement JSR 292 EG adjustments, November 2010
jrose
parents: 7555
diff changeset
  2262
            throw misMatchedTypes("target and handler return types", ttype, htype);
a0ad195efe2c 7001424: implement JSR 292 EG adjustments, November 2010
jrose
parents: 7555
diff changeset
  2263
        List<Class<?>> targs = ttype.parameterList();
a0ad195efe2c 7001424: implement JSR 292 EG adjustments, November 2010
jrose
parents: 7555
diff changeset
  2264
        List<Class<?>> hargs = htype.parameterList();
a0ad195efe2c 7001424: implement JSR 292 EG adjustments, November 2010
jrose
parents: 7555
diff changeset
  2265
        hargs = hargs.subList(1, hargs.size());  // omit leading parameter from handler
a0ad195efe2c 7001424: implement JSR 292 EG adjustments, November 2010
jrose
parents: 7555
diff changeset
  2266
        if (!targs.equals(hargs)) {
a0ad195efe2c 7001424: implement JSR 292 EG adjustments, November 2010
jrose
parents: 7555
diff changeset
  2267
            int hpc = hargs.size(), tpc = targs.size();
a0ad195efe2c 7001424: implement JSR 292 EG adjustments, November 2010
jrose
parents: 7555
diff changeset
  2268
            if (hpc >= tpc || !targs.subList(0, hpc).equals(hargs))
a0ad195efe2c 7001424: implement JSR 292 EG adjustments, November 2010
jrose
parents: 7555
diff changeset
  2269
                throw misMatchedTypes("target and handler types", ttype, htype);
9730
e4b334d47f4b 7032850: MethodHandle.invokeGeneric throws unspecified RuntimeException if parameterized method is called
jrose
parents: 9646
diff changeset
  2270
            handler = dropArguments(handler, 1+hpc, targs.subList(hpc, tpc));
7562
a0ad195efe2c 7001424: implement JSR 292 EG adjustments, November 2010
jrose
parents: 7555
diff changeset
  2271
            htype = handler.type();
a0ad195efe2c 7001424: implement JSR 292 EG adjustments, November 2010
jrose
parents: 7555
diff changeset
  2272
        }
8821
2836ee97ee27 6839872: remove implementation inheritance from JSR 292 APIs
jrose
parents: 8349
diff changeset
  2273
        return MethodHandleImpl.makeGuardWithCatch(target, exType, handler);
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  2274
    }
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  2275
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2276
    /**
8346
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  2277
     * Produces a method handle which will throw exceptions of the given {@code exType}.
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2278
     * The method handle will accept a single argument of {@code exType},
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2279
     * and immediately throw it as an exception.
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2280
     * The method type will nominally specify a return of {@code returnType}.
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2281
     * The return type may be anything convenient:  It doesn't matter to the
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2282
     * method handle's behavior, since it will never return normally.
8346
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  2283
     * @return method handle which can throw the given exceptions
3b891698c4ec 7012650: implement JSR 292 EG adjustments through January 2010
jrose
parents: 8345
diff changeset
  2284
     * @throws NullPointerException if either argument is null
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2285
     */
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2286
    public static
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2287
    MethodHandle throwException(Class<?> returnType, Class<? extends Throwable> exType) {
13423
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  2288
        if (!Throwable.class.isAssignableFrom(exType))
17843fff200d 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 13044
diff changeset
  2289
            throw new ClassCastException(exType.getName());
8821
2836ee97ee27 6839872: remove implementation inheritance from JSR 292 APIs
jrose
parents: 8349
diff changeset
  2290
        return MethodHandleImpl.throwException(MethodType.methodType(returnType, exType));
4537
7c3c7f8d5195 6914665: update jdk code for JSR 292 (post 6858164)
jrose
parents: 2764
diff changeset
  2291
    }
2707
5a17df307cbc 6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff changeset
  2292
}