jdk/src/share/classes/java/dyn/MethodHandleNatives.java
author jrose
Fri, 18 Mar 2011 00:03:24 -0700
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parent 8347 jdk/src/share/classes/sun/dyn/MethodHandleNatives.java@e5daa5772ffd
permissions -rw-r--r--
6839872: remove implementation inheritance from JSR 292 APIs Summary: move everything into a single package; remove all multi-package machinery Reviewed-by: twisti, forax
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/*
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 * Copyright (c) 2008, 2011, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.  Oracle designates this
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 * particular file as subject to the "Classpath" exception as provided
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 * by Oracle in the LICENSE file that accompanied this code.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 */
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package java.dyn;
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import java.dyn.MethodHandles.Lookup;
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import java.lang.reflect.AccessibleObject;
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import java.lang.reflect.Field;
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import static java.dyn.MethodHandleNatives.Constants.*;
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import static java.dyn.MethodHandles.Lookup.IMPL_LOOKUP;
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/**
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 * The JVM interface for the method handles package is all here.
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 * This is an interface internal and private to an implemetantion of JSR 292.
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 * <em>This class is not part of the JSR 292 standard.</em>
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 * @author jrose
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 */
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class MethodHandleNatives {
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    private MethodHandleNatives() { } // static only
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    /// MethodName support
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    static native void init(MemberName self, Object ref);
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    static native void expand(MemberName self);
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    static native void resolve(MemberName self, Class<?> caller);
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    static native int getMembers(Class<?> defc, String matchName, String matchSig,
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            int matchFlags, Class<?> caller, int skip, MemberName[] results);
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    /// MethodHandle support
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    /** Initialize the method handle to adapt the call. */
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    static native void init(AdapterMethodHandle self, MethodHandle target, int argnum);
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    /** Initialize the method handle to call the correct method, directly. */
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    static native void init(BoundMethodHandle self, Object target, int argnum);
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    /** Initialize the method handle to call as if by an invoke* instruction. */
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    static native void init(DirectMethodHandle self, Object ref, boolean doDispatch, Class<?> caller);
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    /** Initialize a method type, once per form. */
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    static native void init(MethodType self);
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    /** Tell the JVM about a class's bootstrap method. */
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    static native void registerBootstrap(Class<?> caller, MethodHandle bootstrapMethod);
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    /** Ask the JVM about a class's bootstrap method. */
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    static native MethodHandle getBootstrap(Class<?> caller);
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    /** Tell the JVM that we need to change the target of an invokedynamic. */
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    static native void setCallSiteTarget(CallSite site, MethodHandle target);
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    /** Fetch the vmtarget field.
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     *  It will be sanitized as necessary to avoid exposing non-Java references.
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     *  This routine is for debugging and reflection.
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     */
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    static native Object getTarget(MethodHandle self, int format);
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    /** Fetch the name of the handled method, if available.
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     *  This routine is for debugging and reflection.
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     */
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    static MemberName getMethodName(MethodHandle self) {
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        return (MemberName) getTarget(self, ETF_METHOD_NAME);
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    }
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    /** Fetch the reflective version of the handled method, if available.
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     */
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    static AccessibleObject getTargetMethod(MethodHandle self) {
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        return (AccessibleObject) getTarget(self, ETF_REFLECT_METHOD);
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    }
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    /** Fetch the target of this method handle.
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     *  If it directly targets a method, return a MemberName for the method.
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     *  If it is chained to another method handle, return that handle.
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     */
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    static Object getTargetInfo(MethodHandle self) {
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        return getTarget(self, ETF_HANDLE_OR_METHOD_NAME);
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    }
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    static Object[] makeTarget(Class<?> defc, String name, String sig, int mods, Class<?> refc) {
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        return new Object[] { defc, name, sig, mods, refc };
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    }
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    /** Fetch MH-related JVM parameter.
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     *  which=0 retrieves MethodHandlePushLimit
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     *  which=1 retrieves stack slot push size (in address units)
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     */
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    static native int getConstant(int which);
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    /** Java copy of MethodHandlePushLimit in range 2..255. */
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    static final int JVM_PUSH_LIMIT;
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    /** JVM stack motion (in words) after one slot is pushed, usually -1.
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     */
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    static final int JVM_STACK_MOVE_UNIT;
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    /** Which conv-ops are implemented by the JVM? */
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    static final int CONV_OP_IMPLEMENTED_MASK;
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    private static native void registerNatives();
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    static {
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        int     JVM_PUSH_LIMIT_;
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        int     JVM_STACK_MOVE_UNIT_;
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        int     CONV_OP_IMPLEMENTED_MASK_;
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        try {
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            registerNatives();
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            JVM_PUSH_LIMIT_ = getConstant(Constants.GC_JVM_PUSH_LIMIT);
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            JVM_STACK_MOVE_UNIT_ = getConstant(Constants.GC_JVM_STACK_MOVE_UNIT);
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            CONV_OP_IMPLEMENTED_MASK_ = getConstant(Constants.GC_CONV_OP_IMPLEMENTED_MASK);
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            //sun.reflect.Reflection.registerMethodsToFilter(MethodHandleImpl.class, "init");
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        } catch (UnsatisfiedLinkError ee) {
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            // ignore; if we use init() methods later we'll see linkage errors
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            JVM_PUSH_LIMIT_ = 3;  // arbitrary
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            JVM_STACK_MOVE_UNIT_ = -1;  // arbitrary
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            CONV_OP_IMPLEMENTED_MASK_ = 0;
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            JVM_PUSH_LIMIT = JVM_PUSH_LIMIT_;
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            JVM_STACK_MOVE_UNIT = JVM_STACK_MOVE_UNIT_;
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            throw ee;  // just die; hopeless to try to run with an older JVM
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        }
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        JVM_PUSH_LIMIT = JVM_PUSH_LIMIT_;
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        JVM_STACK_MOVE_UNIT = JVM_STACK_MOVE_UNIT_;
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        if (CONV_OP_IMPLEMENTED_MASK_ == 0)
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            CONV_OP_IMPLEMENTED_MASK_ = DEFAULT_CONV_OP_IMPLEMENTED_MASK;
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        CONV_OP_IMPLEMENTED_MASK = CONV_OP_IMPLEMENTED_MASK_;
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    }
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    // All compile-time constants go here.
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    // There is an opportunity to check them against the JVM's idea of them.
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    static class Constants {
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        Constants() { } // static only
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        // MethodHandleImpl
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        static final int // for getConstant
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                GC_JVM_PUSH_LIMIT = 0,
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                GC_JVM_STACK_MOVE_UNIT = 1,
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                GC_CONV_OP_IMPLEMENTED_MASK = 2;
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        static final int
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                ETF_HANDLE_OR_METHOD_NAME = 0, // all available data (immediate MH or method)
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                ETF_DIRECT_HANDLE         = 1, // ultimate method handle (will be a DMH, may be self)
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                ETF_METHOD_NAME           = 2, // ultimate method as MemberName
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                ETF_REFLECT_METHOD        = 3; // ultimate method as java.lang.reflect object (sans refClass)
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        // MemberName
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        // The JVM uses values of -2 and above for vtable indexes.
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        // Field values are simple positive offsets.
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        // Ref: src/share/vm/oops/methodOop.hpp
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        // This value is negative enough to avoid such numbers,
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        // but not too negative.
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        static final int
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                MN_IS_METHOD           = 0x00010000, // method (not constructor)
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                MN_IS_CONSTRUCTOR      = 0x00020000, // constructor
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                MN_IS_FIELD            = 0x00040000, // field
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                MN_IS_TYPE             = 0x00080000, // nested type
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                MN_SEARCH_SUPERCLASSES = 0x00100000, // for MHN.getMembers
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                MN_SEARCH_INTERFACES   = 0x00200000, // for MHN.getMembers
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                VM_INDEX_UNINITIALIZED = -99;
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        // AdapterMethodHandle
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        /** Conversions recognized by the JVM.
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         *  They must align with the constants in java.dyn_AdapterMethodHandle,
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         *  in the JVM file hotspot/src/share/vm/classfile/javaClasses.hpp.
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         */
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        static final int
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            OP_RETYPE_ONLY   = 0x0, // no argument changes; straight retype
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            OP_RETYPE_RAW    = 0x1, // no argument changes; straight retype
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            OP_CHECK_CAST    = 0x2, // ref-to-ref conversion; requires a Class argument
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            OP_PRIM_TO_PRIM  = 0x3, // converts from one primitive to another
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            OP_REF_TO_PRIM   = 0x4, // unboxes a wrapper to produce a primitive
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            OP_PRIM_TO_REF   = 0x5, // boxes a primitive into a wrapper (NYI)
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            OP_SWAP_ARGS     = 0x6, // swap arguments (vminfo is 2nd arg)
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            OP_ROT_ARGS      = 0x7, // rotate arguments (vminfo is displaced arg)
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            OP_DUP_ARGS      = 0x8, // duplicates one or more arguments (at TOS)
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            OP_DROP_ARGS     = 0x9, // remove one or more argument slots
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            OP_COLLECT_ARGS  = 0xA, // combine one or more arguments into a varargs (NYI)
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            OP_SPREAD_ARGS   = 0xB, // expand in place a varargs array (of known size)
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            OP_FLYBY         = 0xC, // operate first on reified argument list (NYI)
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            OP_RICOCHET      = 0xD, // run an adapter chain on the return value (NYI)
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            CONV_OP_LIMIT    = 0xE; // limit of CONV_OP enumeration
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        /** Shift and mask values for decoding the AMH.conversion field.
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         *  These numbers are shared with the JVM for creating AMHs.
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         */
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        static final int
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            CONV_OP_MASK     = 0xF00, // this nybble contains the conversion op field
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            CONV_VMINFO_MASK = 0x0FF, // LSB is reserved for JVM use
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            CONV_VMINFO_SHIFT     =  0, // position of bits in CONV_VMINFO_MASK
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            CONV_OP_SHIFT         =  8, // position of bits in CONV_OP_MASK
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            CONV_DEST_TYPE_SHIFT  = 12, // byte 2 has the adapter BasicType (if needed)
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            CONV_SRC_TYPE_SHIFT   = 16, // byte 2 has the source BasicType (if needed)
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            CONV_STACK_MOVE_SHIFT = 20, // high 12 bits give signed SP change
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            CONV_STACK_MOVE_MASK  = (1 << (32 - CONV_STACK_MOVE_SHIFT)) - 1;
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        /** Which conv-ops are implemented by the JVM? */
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        static final int DEFAULT_CONV_OP_IMPLEMENTED_MASK =
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                // Value to use if the corresponding JVM query fails.
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                ((1<<OP_RETYPE_ONLY)
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                |(1<<OP_RETYPE_RAW)
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                |(1<<OP_CHECK_CAST)
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                |(1<<OP_PRIM_TO_PRIM)
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                |(1<<OP_REF_TO_PRIM)
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                |(1<<OP_SWAP_ARGS)
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                |(1<<OP_ROT_ARGS)
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                |(1<<OP_DUP_ARGS)
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                |(1<<OP_DROP_ARGS)
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                //|(1<<OP_SPREAD_ARGS)
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                );
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        /**
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         * Basic types as encoded in the JVM.  These code values are not
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         * intended for use outside this class.  They are used as part of
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         * a private interface between the JVM and this class.
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         */
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        static final int
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            T_BOOLEAN  =  4,
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            T_CHAR     =  5,
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            T_FLOAT    =  6,
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            T_DOUBLE   =  7,
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            T_BYTE     =  8,
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            T_SHORT    =  9,
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            T_INT      = 10,
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            T_LONG     = 11,
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            T_OBJECT   = 12,
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            //T_ARRAY    = 13
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            T_VOID     = 14;
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            //T_ADDRESS  = 15
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        /**
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         * Constant pool reference-kind codes, as used by CONSTANT_MethodHandle CP entries.
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         */
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        static final int
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            REF_getField                = 1,
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            REF_getStatic               = 2,
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            REF_putField                = 3,
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            REF_putStatic               = 4,
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            REF_invokeVirtual           = 5,
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            REF_invokeStatic            = 6,
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            REF_invokeSpecial           = 7,
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            REF_newInvokeSpecial        = 8,
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            REF_invokeInterface         = 9;
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    }
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    private static native int getNamedCon(int which, Object[] name);
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    static boolean verifyConstants() {
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        Object[] box = { null };
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        for (int i = 0; ; i++) {
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            box[0] = null;
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            int vmval = getNamedCon(i, box);
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            if (box[0] == null)  break;
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            String name = (String) box[0];
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            try {
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                Field con = Constants.class.getDeclaredField(name);
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                int jval = con.getInt(null);
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                if (jval != vmval)
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                    throw new InternalError(name+": JVM has "+vmval+" while Java has "+jval);
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            } catch (Exception ex) {
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                throw new InternalError(name+": access failed, got "+ex);
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            }
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        }
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        return true;
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    }
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    static {
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        verifyConstants();
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    }
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    // Up-calls from the JVM.
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    // These must NOT be public.
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    /**
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     * The JVM is linking an invokedynamic instruction.  Create a reified call site for it.
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     */
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    static CallSite makeDynamicCallSite(MethodHandle bootstrapMethod,
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                                        String name, MethodType type,
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                                        Object info,
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                                        MemberName callerMethod, int callerBCI) {
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        return CallSite.makeSite(bootstrapMethod, name, type, info, callerMethod, callerBCI);
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    }
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    /**
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     * Called by the JVM to check the length of a spread array.
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     */
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    static void checkSpreadArgument(Object av, int n) {
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        MethodHandleStatics.checkSpreadArgument(av, n);
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    }
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    /**
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     * The JVM wants a pointer to a MethodType.  Oblige it by finding or creating one.
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     */
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    static MethodType findMethodHandleType(Class<?> rtype, Class<?>[] ptypes) {
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        return MethodType.makeImpl(rtype, ptypes, true);
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    }
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    /**
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     * The JVM wants to use a MethodType with invokeGeneric.  Give the runtime fair warning.
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     */
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    static void notifyGenericMethodType(MethodType type) {
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        type.form().notifyGenericMethodType();
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    }
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    /**
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     * The JVM wants to raise an exception.  Here's the path.
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     */
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    static void raiseException(int code, Object actual, Object required) {
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        String message;
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        // disregard the identity of the actual object, if it is not a class:
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        if (!(actual instanceof Class) && !(actual instanceof MethodType))
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            actual = actual.getClass();
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        if (actual != null)
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            message = "required "+required+" but encountered "+actual;
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        else
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            message = "required "+required;
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        switch (code) {
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        case 192: // checkcast
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            throw new ClassCastException(message);
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        default:
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            throw new InternalError("unexpected code "+code+": "+message);
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        }
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    }
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    /**
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     * The JVM is resolving a CONSTANT_MethodHandle CP entry.  And it wants our help.
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     * It will make an up-call to this method.  (Do not change the name or signature.)
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     */
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    static MethodHandle linkMethodHandleConstant(Class<?> callerClass, int refKind,
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                                                 Class<?> defc, String name, Object type) {
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        try {
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            Lookup lookup = IMPL_LOOKUP.in(callerClass);
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            switch (refKind) {
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            case REF_getField:          return lookup.findGetter(       defc, name, (Class<?>)   type );
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            case REF_getStatic:         return lookup.findStaticGetter( defc, name, (Class<?>)   type );
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            case REF_putField:          return lookup.findSetter(       defc, name, (Class<?>)   type );
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            case REF_putStatic:         return lookup.findStaticSetter( defc, name, (Class<?>)   type );
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            case REF_invokeVirtual:     return lookup.findVirtual(      defc, name, (MethodType) type );
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            case REF_invokeStatic:      return lookup.findStatic(       defc, name, (MethodType) type );
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            case REF_invokeSpecial:     return lookup.findSpecial(      defc, name, (MethodType) type, callerClass );
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            case REF_newInvokeSpecial:  return lookup.findConstructor(  defc,       (MethodType) type );
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            case REF_invokeInterface:   return lookup.findVirtual(      defc, name, (MethodType) type );
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            }
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            throw new IllegalArgumentException("bad MethodHandle constant "+name+" : "+type);
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        } catch (ReflectiveOperationException ex) {
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            Error err = new IncompatibleClassChangeError();
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            err.initCause(ex);
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            throw err;
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        }
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    }
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}