author | jrose |
Tue, 17 May 2011 19:48:14 -0700 | |
changeset 9730 | e4b334d47f4b |
parent 8822 | 8145ab9f5f86 |
child 9731 | d0f7a3e441c4 |
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/* |
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* Copyright (c) 2008, 2011, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package java.lang.invoke; |
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import sun.invoke.util.VerifyType; |
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import sun.invoke.util.Wrapper; |
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import static java.lang.invoke.MethodHandleStatics.*; |
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/** |
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* The flavor of method handle which emulates an invoke instruction |
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* on a predetermined argument. The JVM dispatches to the correct method |
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* when the handle is created, not when it is invoked. |
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* @author jrose |
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*/ |
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class BoundMethodHandle extends MethodHandle { |
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//MethodHandle vmtarget; // next BMH or final DMH or methodOop |
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private final Object argument; // argument to insert |
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private final int vmargslot; // position at which it is inserted |
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// Constructors in this class *must* be package scoped or private. |
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/** Bind a direct MH to its receiver (or first ref. argument). |
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* The JVM will pre-dispatch the MH if it is not already static. |
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*/ |
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/*non-public*/ BoundMethodHandle(DirectMethodHandle mh, Object argument) { |
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super(mh.type().dropParameterTypes(0, 1)); |
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// check the type now, once for all: |
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this.argument = checkReferenceArgument(argument, mh, 0); |
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this.vmargslot = this.type().parameterSlotCount(); |
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initTarget(mh, 0); |
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} |
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/** Insert an argument into an arbitrary method handle. |
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* If argnum is zero, inserts the first argument, etc. |
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* The argument type must be a reference. |
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*/ |
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/*non-public*/ BoundMethodHandle(MethodHandle mh, Object argument, int argnum) { |
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this(mh.type().dropParameterTypes(argnum, argnum+1), |
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mh, argument, argnum); |
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} |
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/** Insert an argument into an arbitrary method handle. |
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* If argnum is zero, inserts the first argument, etc. |
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*/ |
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/*non-public*/ BoundMethodHandle(MethodType type, MethodHandle mh, Object argument, int argnum) { |
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super(type); |
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if (mh.type().parameterType(argnum).isPrimitive()) |
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this.argument = bindPrimitiveArgument(argument, mh, argnum); |
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else { |
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this.argument = checkReferenceArgument(argument, mh, argnum); |
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} |
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this.vmargslot = type.parameterSlotDepth(argnum); |
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initTarget(mh, argnum); |
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} |
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private void initTarget(MethodHandle mh, int argnum) { |
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//this.vmtarget = mh; // maybe updated by JVM |
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MethodHandleNatives.init(this, mh, argnum); |
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} |
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/** For the AdapterMethodHandle subclass. |
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*/ |
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/*non-public*/ BoundMethodHandle(MethodType type, Object argument, int vmargslot) { |
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super(type); |
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this.argument = argument; |
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this.vmargslot = vmargslot; |
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assert(this instanceof AdapterMethodHandle); |
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} |
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/** Initialize the current object as a self-bound method handle, binding it |
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* as the first argument of the method handle {@code entryPoint}. |
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* The invocation type of the resulting method handle will be the |
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* same as {@code entryPoint}, except that the first argument |
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* type will be dropped. |
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*/ |
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/*non-public*/ BoundMethodHandle(MethodHandle entryPoint) { |
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super(entryPoint.type().dropParameterTypes(0, 1)); |
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this.argument = this; // kludge; get rid of |
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this.vmargslot = this.type().parameterSlotDepth(0); |
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initTarget(entryPoint, 0); |
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} |
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/** Make sure the given {@code argument} can be used as {@code argnum}-th |
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* parameter of the given method handle {@code mh}, which must be a reference. |
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* <p> |
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* If this fails, throw a suitable {@code WrongMethodTypeException}, |
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* which will prevent the creation of an illegally typed bound |
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* method handle. |
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*/ |
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final static Object checkReferenceArgument(Object argument, MethodHandle mh, int argnum) { |
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Class<?> ptype = mh.type().parameterType(argnum); |
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if (ptype.isPrimitive()) { |
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// fail |
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} else if (argument == null) { |
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return null; |
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} else if (VerifyType.isNullReferenceConversion(argument.getClass(), ptype)) { |
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return argument; |
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} |
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throw badBoundArgumentException(argument, mh, argnum); |
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} |
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/** Make sure the given {@code argument} can be used as {@code argnum}-th |
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* parameter of the given method handle {@code mh}, which must be a primitive. |
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* <p> |
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* If this fails, throw a suitable {@code WrongMethodTypeException}, |
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* which will prevent the creation of an illegally typed bound |
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* method handle. |
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*/ |
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final static Object bindPrimitiveArgument(Object argument, MethodHandle mh, int argnum) { |
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Class<?> ptype = mh.type().parameterType(argnum); |
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Wrapper wrap = Wrapper.forPrimitiveType(ptype); |
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Object zero = wrap.zero(); |
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if (zero == null) { |
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// fail |
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} else if (argument == null) { |
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if (ptype != int.class && wrap.isSubwordOrInt()) |
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return Integer.valueOf(0); |
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else |
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return zero; |
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} else if (VerifyType.isNullReferenceConversion(argument.getClass(), zero.getClass())) { |
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if (ptype != int.class && wrap.isSubwordOrInt()) |
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return Wrapper.INT.wrap(argument); |
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else |
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return argument; |
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} |
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throw badBoundArgumentException(argument, mh, argnum); |
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} |
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|
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final static RuntimeException badBoundArgumentException(Object argument, MethodHandle mh, int argnum) { |
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String atype = (argument == null) ? "null" : argument.getClass().toString(); |
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return new WrongMethodTypeException("cannot bind "+atype+" argument to parameter #"+argnum+" of "+mh.type()); |
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} |
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156 |
|
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@Override |
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public String toString() { |
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return addTypeString(baseName(), this); |
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} |
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|
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/** Component of toString() before the type string. */ |
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protected String baseName() { |
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MethodHandle mh = this; |
165 |
while (mh instanceof BoundMethodHandle) { |
|
166 |
Object info = MethodHandleNatives.getTargetInfo(mh); |
|
167 |
if (info instanceof MethodHandle) { |
|
168 |
mh = (MethodHandle) info; |
|
169 |
} else { |
|
170 |
String name = null; |
|
171 |
if (info instanceof MemberName) |
|
172 |
name = ((MemberName)info).getName(); |
|
173 |
if (name != null) |
|
174 |
return name; |
|
175 |
else |
|
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return noParens(super.toString()); // "invoke", probably |
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} |
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assert(mh != this); |
|
179 |
} |
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return noParens(mh.toString()); |
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} |
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|
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private static String noParens(String str) { |
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int paren = str.indexOf('('); |
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if (paren >= 0) str = str.substring(0, paren); |
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return str; |
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} |
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} |