author | jrose |
Fri, 30 Apr 2010 23:48:23 -0700 | |
changeset 5722 | 4ada807383c8 |
parent 4537 | 7c3c7f8d5195 |
child 5725 | 16c1792b2ee6 |
permissions | -rw-r--r-- |
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/* |
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* Copyright 2008-2009 Sun Microsystems, Inc. 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. Sun designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
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* CA 95054 USA or visit www.sun.com if you need additional information or |
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* have any questions. |
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*/ |
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package sun.dyn; |
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import sun.dyn.util.VerifyType; |
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import sun.dyn.util.Wrapper; |
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import java.dyn.*; |
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import java.util.Arrays; |
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import static sun.dyn.MethodHandleNatives.Constants.*; |
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import static sun.dyn.MemberName.newIllegalArgumentException; |
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|
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/** |
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* This method handle performs simple conversion or checking of a single argument. |
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* @author jrose |
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*/ |
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public class AdapterMethodHandle extends BoundMethodHandle { |
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//MethodHandle vmtarget; // next AMH or BMH in chain or final DMH |
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//Object argument; // parameter to the conversion if needed |
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//int vmargslot; // which argument slot is affected |
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private final int conversion; // the type of conversion: RETYPE_ONLY, etc. |
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|
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// Constructors in this class *must* be package scoped or private. |
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private AdapterMethodHandle(MethodHandle target, MethodType newType, |
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long conv, Object convArg) { |
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super(newType, convArg, newType.parameterSlotDepth(1+convArgPos(conv))); |
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this.conversion = convCode(conv); |
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if (MethodHandleNatives.JVM_SUPPORT) { |
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// JVM might update VM-specific bits of conversion (ignore) |
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MethodHandleNatives.init(this, target, convArgPos(conv)); |
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} |
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} |
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private AdapterMethodHandle(MethodHandle target, MethodType newType, |
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long conv) { |
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this(target, newType, conv, null); |
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} |
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private static final Access IMPL_TOKEN = Access.getToken(); |
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// TO DO: When adapting another MH with a null conversion, clone |
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// the target and change its type, instead of adding another layer. |
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|
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/** Can a JVM-level adapter directly implement the proposed |
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* argument conversions, as if by MethodHandles.convertArguments? |
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*/ |
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public static boolean canPairwiseConvert(MethodType newType, MethodType oldType) { |
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// same number of args, of course |
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int len = newType.parameterCount(); |
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if (len != oldType.parameterCount()) |
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return false; |
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// Check return type. (Not much can be done with it.) |
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Class<?> exp = newType.returnType(); |
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Class<?> ret = oldType.returnType(); |
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if (!VerifyType.isNullConversion(ret, exp)) |
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return false; |
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// Check args pairwise. |
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for (int i = 0; i < len; i++) { |
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Class<?> src = newType.parameterType(i); // source type |
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Class<?> dst = oldType.parameterType(i); // destination type |
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if (!canConvertArgument(src, dst)) |
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return false; |
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} |
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return true; |
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} |
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/** Can a JVM-level adapter directly implement the proposed |
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* argument conversion, as if by MethodHandles.convertArguments? |
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*/ |
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public static boolean canConvertArgument(Class<?> src, Class<?> dst) { |
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// ? Retool this logic to use RETYPE_ONLY, CHECK_CAST, etc., as opcodes, |
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// so we don't need to repeat so much decision making. |
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if (VerifyType.isNullConversion(src, dst)) { |
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return true; |
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} else if (src.isPrimitive()) { |
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if (dst.isPrimitive()) |
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return canPrimCast(src, dst); |
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else |
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return canBoxArgument(src, dst); |
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} else { |
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if (dst.isPrimitive()) |
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return canUnboxArgument(src, dst); |
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else |
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return true; // any two refs can be interconverted |
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} |
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} |
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/** |
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* Create a JVM-level adapter method handle to conform the given method |
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* handle to the similar newType, using only pairwise argument conversions. |
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* For each argument, convert incoming argument to the exact type needed. |
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* Only null conversions are allowed on the return value (until |
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* the JVM supports ricochet adapters). |
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* The argument conversions allowed are casting, unboxing, |
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* integral widening or narrowing, and floating point widening or narrowing. |
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* @param token access check |
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* @param newType required call type |
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* @param target original method handle |
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* @return an adapter to the original handle with the desired new type, |
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* or the original target if the types are already identical |
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* or null if the adaptation cannot be made |
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*/ |
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public static MethodHandle makePairwiseConvert(Access token, |
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MethodType newType, MethodHandle target) { |
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Access.check(token); |
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MethodType oldType = target.type(); |
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if (newType == oldType) return target; |
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if (!canPairwiseConvert(newType, oldType)) |
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return null; |
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136 |
// (after this point, it is an assertion error to fail to convert) |
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|
137 |
|
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|
138 |
// Find last non-trivial conversion (if any). |
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|
139 |
int lastConv = newType.parameterCount()-1; |
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|
140 |
while (lastConv >= 0) { |
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|
141 |
Class<?> src = newType.parameterType(lastConv); // source type |
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142 |
Class<?> dst = oldType.parameterType(lastConv); // destination type |
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|
143 |
if (VerifyType.isNullConversion(src, dst)) { |
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|
144 |
--lastConv; |
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|
145 |
} else { |
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|
146 |
break; |
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|
147 |
} |
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|
148 |
} |
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|
149 |
// Now build a chain of one or more adapters. |
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|
150 |
MethodHandle adapter = target; |
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|
151 |
MethodType midType = oldType.changeReturnType(newType.returnType()); |
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|
152 |
for (int i = 0; i <= lastConv; i++) { |
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153 |
Class<?> src = newType.parameterType(i); // source type |
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154 |
Class<?> dst = midType.parameterType(i); // destination type |
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|
155 |
if (VerifyType.isNullConversion(src, dst)) { |
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|
156 |
// do nothing: difference is trivial |
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|
157 |
continue; |
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|
158 |
} |
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|
159 |
// Work the current type backward toward the desired caller type: |
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|
160 |
if (i != lastConv) { |
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|
161 |
midType = midType.changeParameterType(i, src); |
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|
162 |
} else { |
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|
163 |
// When doing the last (or only) real conversion, |
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|
164 |
// force all remaining null conversions to happen also. |
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|
165 |
assert(VerifyType.isNullConversion(newType, midType.changeParameterType(i, src))); |
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|
166 |
midType = newType; |
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|
167 |
} |
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|
168 |
|
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|
169 |
// Tricky case analysis follows. |
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|
170 |
// It parallels canConvertArgument() above. |
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|
171 |
if (src.isPrimitive()) { |
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|
172 |
if (dst.isPrimitive()) { |
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|
173 |
adapter = makePrimCast(token, midType, adapter, i, dst); |
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|
174 |
} else { |
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|
175 |
adapter = makeBoxArgument(token, midType, adapter, i, dst); |
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|
176 |
} |
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|
177 |
} else { |
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|
178 |
if (dst.isPrimitive()) { |
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|
179 |
// Caller has boxed a primitive. Unbox it for the target. |
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|
180 |
// The box type must correspond exactly to the primitive type. |
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|
181 |
// This is simpler than the powerful set of widening |
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|
182 |
// conversions supported by reflect.Method.invoke. |
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|
183 |
// Those conversions require a big nest of if/then/else logic, |
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|
184 |
// which we prefer to make a user responsibility. |
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|
185 |
adapter = makeUnboxArgument(token, midType, adapter, i, dst); |
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|
186 |
} else { |
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|
187 |
// Simple reference conversion. |
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|
188 |
// Note: Do not check for a class hierarchy relation |
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|
189 |
// between src and dst. In all cases a 'null' argument |
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|
190 |
// will pass the cast conversion. |
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|
191 |
adapter = makeCheckCast(token, midType, adapter, i, dst); |
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|
192 |
} |
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|
193 |
} |
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|
194 |
assert(adapter != null); |
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|
195 |
assert(adapter.type() == midType); |
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|
196 |
} |
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|
197 |
if (adapter.type() != newType) { |
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|
198 |
// Only trivial conversions remain. |
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|
199 |
adapter = makeRetypeOnly(IMPL_TOKEN, newType, adapter); |
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|
200 |
assert(adapter != null); |
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parents:
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|
201 |
// Actually, that's because there were no non-trivial ones: |
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diff
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|
202 |
assert(lastConv == -1); |
5a17df307cbc
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parents:
diff
changeset
|
203 |
} |
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diff
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|
204 |
assert(adapter.type() == newType); |
5a17df307cbc
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|
205 |
return adapter; |
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|
206 |
} |
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|
207 |
|
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|
208 |
/** |
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|
209 |
* Create a JVM-level adapter method handle to permute the arguments |
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|
210 |
* of the given method. |
5a17df307cbc
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|
211 |
* @param token access check |
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|
212 |
* @param newType required call type |
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|
213 |
* @param target original method handle |
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|
214 |
* @param argumentMap for each target argument, position of its source in newType |
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|
215 |
* @return an adapter to the original handle with the desired new type, |
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|
216 |
* or the original target if the types are already identical |
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|
217 |
* and the permutation is null |
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|
218 |
* @throws IllegalArgumentException if the adaptation cannot be made |
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|
219 |
* directly by a JVM-level adapter, without help from Java code |
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|
220 |
*/ |
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|
221 |
public static MethodHandle makePermutation(Access token, |
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|
222 |
MethodType newType, MethodHandle target, |
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|
223 |
int[] argumentMap) { |
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|
224 |
MethodType oldType = target.type(); |
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|
225 |
boolean nullPermutation = true; |
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|
226 |
for (int i = 0; i < argumentMap.length; i++) { |
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|
227 |
int pos = argumentMap[i]; |
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|
228 |
if (pos != i) |
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|
229 |
nullPermutation = false; |
5a17df307cbc
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|
230 |
if (pos < 0 || pos >= newType.parameterCount()) { |
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|
231 |
argumentMap = new int[0]; break; |
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|
232 |
} |
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|
233 |
} |
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|
234 |
if (argumentMap.length != oldType.parameterCount()) |
5a17df307cbc
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|
235 |
throw newIllegalArgumentException("bad permutation: "+Arrays.toString(argumentMap)); |
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|
236 |
if (nullPermutation) { |
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|
237 |
MethodHandle res = makePairwiseConvert(token, newType, target); |
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|
238 |
// well, that was easy |
5a17df307cbc
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|
239 |
if (res == null) |
5a17df307cbc
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|
240 |
throw newIllegalArgumentException("cannot convert pairwise: "+newType); |
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|
241 |
return res; |
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|
242 |
} |
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|
243 |
|
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|
244 |
// Check return type. (Not much can be done with it.) |
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|
245 |
Class<?> exp = newType.returnType(); |
5a17df307cbc
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|
246 |
Class<?> ret = oldType.returnType(); |
5a17df307cbc
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|
247 |
if (!VerifyType.isNullConversion(ret, exp)) |
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|
248 |
throw newIllegalArgumentException("bad return conversion for "+newType); |
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|
249 |
|
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|
250 |
// See if the argument types match up. |
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|
251 |
for (int i = 0; i < argumentMap.length; i++) { |
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|
252 |
int j = argumentMap[i]; |
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|
253 |
Class<?> src = newType.parameterType(j); |
5a17df307cbc
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|
254 |
Class<?> dst = oldType.parameterType(i); |
5a17df307cbc
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|
255 |
if (!VerifyType.isNullConversion(src, dst)) |
5a17df307cbc
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|
256 |
throw newIllegalArgumentException("bad argument #"+j+" conversion for "+newType); |
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|
257 |
} |
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|
258 |
|
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|
259 |
// Now figure out a nice mix of SWAP, ROT, DUP, and DROP adapters. |
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|
260 |
// A workable greedy algorithm is as follows: |
5a17df307cbc
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diff
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|
261 |
// Drop unused outgoing arguments (right to left: shallowest first). |
5a17df307cbc
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|
262 |
// Duplicate doubly-used outgoing arguments (left to right: deepest first). |
5a17df307cbc
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parents:
diff
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|
263 |
// Then the remaining problem is a true argument permutation. |
5a17df307cbc
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parents:
diff
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|
264 |
// Marshal the outgoing arguments as required from left to right. |
5a17df307cbc
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parents:
diff
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|
265 |
// That is, find the deepest outgoing stack position that does not yet |
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diff
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|
266 |
// have the correct argument value, and correct at least that position |
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|
267 |
// by swapping or rotating in the misplaced value (from a shallower place). |
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|
268 |
// If the misplaced value is followed by one or more consecutive values |
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|
269 |
// (also misplaced) issue a rotation which brings as many as possible |
5a17df307cbc
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diff
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|
270 |
// into position. Otherwise make progress with either a swap or a |
5a17df307cbc
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|
271 |
// rotation. Prefer the swap as cheaper, but do not use it if it |
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// breaks a slot pair. Prefer the rotation over the swap if it would |
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// preserve more consecutive values shallower than the target position. |
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// When more than one rotation will work (because the required value |
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// is already adjacent to the target position), then use a rotation |
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// which moves the old value in the target position adjacent to |
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// one of its consecutive values. Also, prefer shorter rotation |
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// spans, since they use fewer memory cycles for shuffling. |
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|
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throw new UnsupportedOperationException("NYI"); |
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} |
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282 |
|
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private static byte basicType(Class<?> type) { |
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if (type == null) return T_VOID; |
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switch (Wrapper.forBasicType(type)) { |
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case BOOLEAN: return T_BOOLEAN; |
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case CHAR: return T_CHAR; |
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case FLOAT: return T_FLOAT; |
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case DOUBLE: return T_DOUBLE; |
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case BYTE: return T_BYTE; |
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case SHORT: return T_SHORT; |
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case INT: return T_INT; |
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case LONG: return T_LONG; |
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case OBJECT: return T_OBJECT; |
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case VOID: return T_VOID; |
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296 |
} |
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return 99; // T_ILLEGAL or some such |
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298 |
} |
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299 |
|
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/** Number of stack slots for the given type. |
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* Two for T_DOUBLE and T_FLOAT, one for the rest. |
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*/ |
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303 |
private static int type2size(int type) { |
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assert(type >= T_BOOLEAN && type <= T_OBJECT); |
4537 | 305 |
return (type == T_LONG || type == T_DOUBLE) ? 2 : 1; |
306 |
} |
|
307 |
private static int type2size(Class<?> type) { |
|
308 |
return type2size(basicType(type)); |
|
309 |
} |
|
310 |
||
311 |
/** The given stackMove is the number of slots pushed. |
|
312 |
* It might be negative. Scale it (multiply) by the |
|
313 |
* VM's notion of how an address changes with a push, |
|
314 |
* to get the raw SP change for stackMove. |
|
315 |
* Then shift and mask it into the correct field. |
|
316 |
*/ |
|
317 |
private static long insertStackMove(int stackMove) { |
|
318 |
// following variable must be long to avoid sign extension after '<<' |
|
319 |
long spChange = stackMove * MethodHandleNatives.JVM_STACK_MOVE_UNIT; |
|
320 |
return (spChange & CONV_STACK_MOVE_MASK) << CONV_STACK_MOVE_SHIFT; |
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} |
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322 |
|
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/** Construct an adapter conversion descriptor for a single-argument conversion. */ |
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private static long makeConv(int convOp, int argnum, int src, int dest) { |
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assert(src == (src & 0xF)); |
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assert(dest == (dest & 0xF)); |
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assert(convOp >= OP_CHECK_CAST && convOp <= OP_PRIM_TO_REF); |
4537 | 328 |
int stackMove = type2size(dest) - type2size(src); |
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return ((long) argnum << 32 | |
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(long) convOp << CONV_OP_SHIFT | |
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(int) src << CONV_SRC_TYPE_SHIFT | |
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(int) dest << CONV_DEST_TYPE_SHIFT | |
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insertStackMove(stackMove) |
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); |
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335 |
} |
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private static long makeConv(int convOp, int argnum, int stackMove) { |
4537 | 337 |
assert(convOp >= OP_DUP_ARGS && convOp <= OP_SPREAD_ARGS); |
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byte src = 0, dest = 0; |
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if (convOp >= OP_COLLECT_ARGS && convOp <= OP_SPREAD_ARGS) |
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src = dest = T_OBJECT; |
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341 |
return ((long) argnum << 32 | |
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(long) convOp << CONV_OP_SHIFT | |
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(int) src << CONV_SRC_TYPE_SHIFT | |
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(int) dest << CONV_DEST_TYPE_SHIFT | |
4537 | 345 |
insertStackMove(stackMove) |
346 |
); |
|
347 |
} |
|
348 |
private static long makeSwapConv(int convOp, int srcArg, byte type, int destSlot) { |
|
349 |
assert(convOp >= OP_SWAP_ARGS && convOp <= OP_ROT_ARGS); |
|
350 |
return ((long) srcArg << 32 | |
|
351 |
(long) convOp << CONV_OP_SHIFT | |
|
352 |
(int) type << CONV_SRC_TYPE_SHIFT | |
|
353 |
(int) type << CONV_DEST_TYPE_SHIFT | |
|
354 |
(int) destSlot << CONV_VMINFO_SHIFT |
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); |
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356 |
} |
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357 |
private static long makeConv(int convOp) { |
4537 | 358 |
assert(convOp == OP_RETYPE_ONLY || convOp == OP_RETYPE_RAW); |
359 |
return ((long)-1 << 32) | (convOp << CONV_OP_SHIFT); // stackMove, src, dst all zero |
|
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} |
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private static int convCode(long conv) { |
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362 |
return (int)conv; |
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363 |
} |
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364 |
private static int convArgPos(long conv) { |
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|
365 |
return (int)(conv >>> 32); |
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|
366 |
} |
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367 |
private static boolean convOpSupported(int convOp) { |
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|
368 |
assert(convOp >= 0 && convOp <= CONV_OP_LIMIT); |
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return ((1<<convOp) & MethodHandleNatives.CONV_OP_IMPLEMENTED_MASK) != 0; |
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} |
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371 |
|
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372 |
/** One of OP_RETYPE_ONLY, etc. */ |
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373 |
int conversionOp() { return (conversion & CONV_OP_MASK) >> CONV_OP_SHIFT; } |
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374 |
|
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375 |
/* Return one plus the position of the first non-trivial difference |
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|
376 |
* between the given types. This is not a symmetric operation; |
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|
377 |
* we are considering adapting the targetType to adapterType. |
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|
378 |
* Trivial differences are those which could be ignored by the JVM |
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|
379 |
* without subverting the verifier. Otherwise, adaptable differences |
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380 |
* are ones for which we could create an adapter to make the type change. |
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381 |
* Return zero if there are no differences (other than trivial ones). |
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382 |
* Return 1+N if N is the only adaptable argument difference. |
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|
383 |
* Return the -2-N where N is the first of several adaptable |
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|
384 |
* argument differences. |
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|
385 |
* Return -1 if there there are differences which are not adaptable. |
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|
386 |
*/ |
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|
387 |
private static int diffTypes(MethodType adapterType, |
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|
388 |
MethodType targetType, |
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|
389 |
boolean raw) { |
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|
390 |
int diff; |
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|
391 |
diff = diffReturnTypes(adapterType, targetType, raw); |
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|
392 |
if (diff != 0) return diff; |
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|
393 |
int nargs = adapterType.parameterCount(); |
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|
394 |
if (nargs != targetType.parameterCount()) |
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|
395 |
return -1; |
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|
396 |
diff = diffParamTypes(adapterType, 0, targetType, 0, nargs, raw); |
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|
397 |
//System.out.println("diff "+adapterType); |
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|
398 |
//System.out.println(" "+diff+" "+targetType); |
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|
399 |
return diff; |
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|
400 |
} |
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|
401 |
private static int diffReturnTypes(MethodType adapterType, |
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|
402 |
MethodType targetType, |
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|
403 |
boolean raw) { |
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|
404 |
Class<?> src = targetType.returnType(); |
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|
405 |
Class<?> dst = adapterType.returnType(); |
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|
406 |
if ((!raw |
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|
407 |
? VerifyType.canPassUnchecked(src, dst) |
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|
408 |
: VerifyType.canPassRaw(src, dst) |
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|
409 |
) > 0) |
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|
410 |
return 0; // no significant difference |
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|
411 |
if (raw && !src.isPrimitive() && !dst.isPrimitive()) |
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|
412 |
return 0; // can force a reference return (very carefully!) |
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|
413 |
//if (false) return 1; // never adaptable! |
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|
414 |
return -1; // some significant difference |
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|
415 |
} |
4537 | 416 |
private static int diffParamTypes(MethodType adapterType, int astart, |
417 |
MethodType targetType, int tstart, |
|
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418 |
int nargs, boolean raw) { |
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|
419 |
assert(nargs >= 0); |
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|
420 |
int res = 0; |
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|
421 |
for (int i = 0; i < nargs; i++) { |
4537 | 422 |
Class<?> src = adapterType.parameterType(astart+i); |
423 |
Class<?> dest = targetType.parameterType(tstart+i); |
|
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|
424 |
if ((!raw |
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|
425 |
? VerifyType.canPassUnchecked(src, dest) |
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426 |
: VerifyType.canPassRaw(src, dest) |
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parents:
diff
changeset
|
427 |
) <= 0) { |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
428 |
// found a difference; is it the only one so far? |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
429 |
if (res != 0) |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
430 |
return -1-res; // return -2-i for prev. i |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
431 |
res = 1+i; |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
432 |
} |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
433 |
} |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
434 |
return res; |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
435 |
} |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
436 |
|
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
437 |
/** Can a retyping adapter (alone) validly convert the target to newType? */ |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
438 |
public static boolean canRetypeOnly(MethodType newType, MethodType targetType) { |
4537 | 439 |
return canRetype(newType, targetType, false); |
2707
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
440 |
} |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
441 |
/** Can a retyping adapter (alone) convert the target to newType? |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
442 |
* It is allowed to widen subword types and void to int, to make bitwise |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
443 |
* conversions between float/int and double/long, and to perform unchecked |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
444 |
* reference conversions on return. This last feature requires that the |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
445 |
* caller be trusted, and perform explicit cast conversions on return values. |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
446 |
*/ |
4537 | 447 |
public static boolean canRetypeRaw(MethodType newType, MethodType targetType) { |
448 |
return canRetype(newType, targetType, true); |
|
2707
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
449 |
} |
4537 | 450 |
static boolean canRetype(MethodType newType, MethodType targetType, boolean raw) { |
451 |
if (!convOpSupported(raw ? OP_RETYPE_RAW : OP_RETYPE_ONLY)) return false; |
|
2707
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
452 |
int diff = diffTypes(newType, targetType, raw); |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
453 |
// %%% This assert is too strong. Factor diff into VerifyType and reconcile. |
4537 | 454 |
assert(raw || (diff == 0) == VerifyType.isNullConversion(newType, targetType)); |
2707
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
455 |
return diff == 0; |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
456 |
} |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
457 |
|
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
458 |
/** Factory method: Performs no conversions; simply retypes the adapter. |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
459 |
* Allows unchecked argument conversions pairwise, if they are safe. |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
460 |
* Returns null if not possible. |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
461 |
*/ |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
462 |
public static MethodHandle makeRetypeOnly(Access token, |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
463 |
MethodType newType, MethodHandle target) { |
4537 | 464 |
return makeRetype(token, newType, target, false); |
2707
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
465 |
} |
4537 | 466 |
public static MethodHandle makeRetypeRaw(Access token, |
2707
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
467 |
MethodType newType, MethodHandle target) { |
4537 | 468 |
return makeRetype(token, newType, target, true); |
2707
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
469 |
} |
4537 | 470 |
static MethodHandle makeRetype(Access token, |
2707
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
471 |
MethodType newType, MethodHandle target, boolean raw) { |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
472 |
Access.check(token); |
4537 | 473 |
MethodType oldType = target.type(); |
474 |
if (oldType == newType) return target; |
|
475 |
if (!canRetype(newType, oldType, raw)) |
|
2707
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
476 |
return null; |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
477 |
// TO DO: clone the target guy, whatever he is, with new type. |
4537 | 478 |
return new AdapterMethodHandle(target, newType, makeConv(raw ? OP_RETYPE_RAW : OP_RETYPE_ONLY)); |
2707
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
479 |
} |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
480 |
|
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
481 |
/** Can a checkcast adapter validly convert the target to newType? |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
482 |
* The JVM supports all kind of reference casts, even silly ones. |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
483 |
*/ |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
484 |
public static boolean canCheckCast(MethodType newType, MethodType targetType, |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
485 |
int arg, Class<?> castType) { |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
486 |
if (!convOpSupported(OP_CHECK_CAST)) return false; |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
487 |
Class<?> src = newType.parameterType(arg); |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
488 |
Class<?> dst = targetType.parameterType(arg); |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
489 |
if (!canCheckCast(src, castType) |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
490 |
|| !VerifyType.isNullConversion(castType, dst)) |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
491 |
return false; |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
492 |
int diff = diffTypes(newType, targetType, false); |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
493 |
return (diff == arg+1); // arg is sole non-trivial diff |
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 |
/** Can an primitive conversion adapter validly convert src to dst? */ |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
496 |
public static boolean canCheckCast(Class<?> src, Class<?> dst) { |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
497 |
return (!src.isPrimitive() && !dst.isPrimitive()); |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
498 |
} |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
499 |
|
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
500 |
/** Factory method: Forces a cast at the given argument. |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
501 |
* The castType is the target of the cast, and can be any type |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
502 |
* with a null conversion to the corresponding target parameter. |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
503 |
* Return null if this cannot be done. |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
504 |
*/ |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
505 |
public static MethodHandle makeCheckCast(Access token, |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
506 |
MethodType newType, MethodHandle target, |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
507 |
int arg, Class<?> castType) { |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
508 |
Access.check(token); |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
509 |
if (!canCheckCast(newType, target.type(), arg, castType)) |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
510 |
return null; |
4537 | 511 |
long conv = makeConv(OP_CHECK_CAST, arg, T_OBJECT, T_OBJECT); |
2707
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
512 |
return new AdapterMethodHandle(target, newType, conv, castType); |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
513 |
} |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
514 |
|
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
515 |
/** Can an primitive conversion adapter validly convert the target to newType? |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
516 |
* The JVM currently supports all conversions except those between |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
517 |
* floating and integral types. |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
518 |
*/ |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
519 |
public static boolean canPrimCast(MethodType newType, MethodType targetType, |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
520 |
int arg, Class<?> convType) { |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
521 |
if (!convOpSupported(OP_PRIM_TO_PRIM)) return false; |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
522 |
Class<?> src = newType.parameterType(arg); |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
523 |
Class<?> dst = targetType.parameterType(arg); |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
524 |
if (!canPrimCast(src, convType) |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
525 |
|| !VerifyType.isNullConversion(convType, dst)) |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
526 |
return false; |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
527 |
int diff = diffTypes(newType, targetType, false); |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
528 |
return (diff == arg+1); // arg is sole non-trivial diff |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
529 |
} |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
530 |
/** Can an primitive conversion adapter validly convert src to dst? */ |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
531 |
public static boolean canPrimCast(Class<?> src, Class<?> dst) { |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
532 |
if (src == dst || !src.isPrimitive() || !dst.isPrimitive()) { |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
533 |
return false; |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
534 |
} else if (Wrapper.forPrimitiveType(dst).isFloating()) { |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
535 |
// both must be floating types |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
536 |
return Wrapper.forPrimitiveType(src).isFloating(); |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
537 |
} else { |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
538 |
// both are integral, and all combinations work fine |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
539 |
assert(Wrapper.forPrimitiveType(src).isIntegral() && |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
540 |
Wrapper.forPrimitiveType(dst).isIntegral()); |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
541 |
return true; |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
542 |
} |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
543 |
} |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
544 |
|
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
545 |
/** Factory method: Truncate the given argument with zero or sign extension, |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
546 |
* and/or convert between single and doubleword versions of integer or float. |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
547 |
* The convType is the target of the conversion, and can be any type |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
548 |
* with a null conversion to the corresponding target parameter. |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
549 |
* Return null if this cannot be done. |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
550 |
*/ |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
551 |
public static MethodHandle makePrimCast(Access token, |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
552 |
MethodType newType, MethodHandle target, |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
553 |
int arg, Class<?> convType) { |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
554 |
Access.check(token); |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
555 |
MethodType oldType = target.type(); |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
556 |
if (!canPrimCast(newType, oldType, arg, convType)) |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
557 |
return null; |
4537 | 558 |
Class<?> src = newType.parameterType(arg); |
2707
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
559 |
long conv = makeConv(OP_PRIM_TO_PRIM, arg, basicType(src), basicType(convType)); |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
560 |
return new AdapterMethodHandle(target, newType, conv); |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
561 |
} |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
562 |
|
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
563 |
/** Can an unboxing conversion validly convert src to dst? |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
564 |
* The JVM currently supports all kinds of casting and unboxing. |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
565 |
* The convType is the unboxed type; it can be either a primitive or wrapper. |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
566 |
*/ |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
567 |
public static boolean canUnboxArgument(MethodType newType, MethodType targetType, |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
568 |
int arg, Class<?> convType) { |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
569 |
if (!convOpSupported(OP_REF_TO_PRIM)) return false; |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
570 |
Class<?> src = newType.parameterType(arg); |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
571 |
Class<?> dst = targetType.parameterType(arg); |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
572 |
Class<?> boxType = Wrapper.asWrapperType(convType); |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
573 |
convType = Wrapper.asPrimitiveType(convType); |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
574 |
if (!canCheckCast(src, boxType) |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
575 |
|| boxType == convType |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
576 |
|| !VerifyType.isNullConversion(convType, dst)) |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
577 |
return false; |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
578 |
int diff = diffTypes(newType, targetType, false); |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
579 |
return (diff == arg+1); // arg is sole non-trivial diff |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
580 |
} |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
581 |
/** Can an primitive unboxing adapter validly convert src to dst? */ |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
582 |
public static boolean canUnboxArgument(Class<?> src, Class<?> dst) { |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
583 |
return (!src.isPrimitive() && Wrapper.asPrimitiveType(dst).isPrimitive()); |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
584 |
} |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
585 |
|
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
586 |
/** Factory method: Unbox the given argument. |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
587 |
* Return null if this cannot be done. |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
588 |
*/ |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
589 |
public static MethodHandle makeUnboxArgument(Access token, |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
590 |
MethodType newType, MethodHandle target, |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
591 |
int arg, Class<?> convType) { |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
592 |
MethodType oldType = target.type(); |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
593 |
Class<?> src = newType.parameterType(arg); |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
594 |
Class<?> dst = oldType.parameterType(arg); |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
595 |
Class<?> boxType = Wrapper.asWrapperType(convType); |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
596 |
Class<?> primType = Wrapper.asPrimitiveType(convType); |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
597 |
if (!canUnboxArgument(newType, oldType, arg, convType)) |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
598 |
return null; |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
599 |
MethodType castDone = newType; |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
600 |
if (!VerifyType.isNullConversion(src, boxType)) |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
601 |
castDone = newType.changeParameterType(arg, boxType); |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
602 |
long conv = makeConv(OP_REF_TO_PRIM, arg, T_OBJECT, basicType(primType)); |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
603 |
MethodHandle adapter = new AdapterMethodHandle(target, castDone, conv, boxType); |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
604 |
if (castDone == newType) |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
605 |
return adapter; |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
606 |
return makeCheckCast(token, newType, adapter, arg, boxType); |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
607 |
} |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
608 |
|
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
609 |
/** Can an primitive boxing adapter validly convert src to dst? */ |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
610 |
public static boolean canBoxArgument(Class<?> src, Class<?> dst) { |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
611 |
if (!convOpSupported(OP_PRIM_TO_REF)) return false; |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
612 |
throw new UnsupportedOperationException("NYI"); |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
613 |
} |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
614 |
|
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
615 |
/** Factory method: Unbox the given argument. |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
616 |
* Return null if this cannot be done. |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
617 |
*/ |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
618 |
public static MethodHandle makeBoxArgument(Access token, |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
619 |
MethodType newType, MethodHandle target, |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
620 |
int arg, Class<?> convType) { |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
621 |
// this is difficult to do in the JVM because it must GC |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
622 |
return null; |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
623 |
} |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
624 |
|
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
625 |
/** Can an adapter simply drop arguments to convert the target to newType? */ |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
626 |
public static boolean canDropArguments(MethodType newType, MethodType targetType, |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
627 |
int dropArgPos, int dropArgCount) { |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
628 |
if (dropArgCount == 0) |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
629 |
return canRetypeOnly(newType, targetType); |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
630 |
if (!convOpSupported(OP_DROP_ARGS)) return false; |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
631 |
if (diffReturnTypes(newType, targetType, false) != 0) |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
632 |
return false; |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
633 |
int nptypes = newType.parameterCount(); |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
634 |
// parameter types must be the same up to the drop point |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
635 |
if (dropArgPos != 0 && diffParamTypes(newType, 0, targetType, 0, dropArgPos, false) != 0) |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
636 |
return false; |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
637 |
int afterPos = dropArgPos + dropArgCount; |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
638 |
int afterCount = nptypes - afterPos; |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
639 |
if (dropArgPos < 0 || dropArgPos >= nptypes || |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
640 |
dropArgCount < 1 || afterPos > nptypes || |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
641 |
targetType.parameterCount() != nptypes - dropArgCount) |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
642 |
return false; |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
643 |
// parameter types after the drop point must also be the same |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
644 |
if (afterCount != 0 && diffParamTypes(newType, afterPos, targetType, dropArgPos, afterCount, false) != 0) |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
645 |
return false; |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
646 |
return true; |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
647 |
} |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
648 |
|
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
649 |
/** Factory method: Drop selected arguments. |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
650 |
* Allow unchecked retyping of remaining arguments, pairwise. |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
651 |
* Return null if this is not possible. |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
652 |
*/ |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
653 |
public static MethodHandle makeDropArguments(Access token, |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
654 |
MethodType newType, MethodHandle target, |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
655 |
int dropArgPos, int dropArgCount) { |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
656 |
Access.check(token); |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
657 |
if (dropArgCount == 0) |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
658 |
return makeRetypeOnly(IMPL_TOKEN, newType, target); |
4537 | 659 |
if (!canDropArguments(newType, target.type(), dropArgPos, dropArgCount)) |
660 |
return null; |
|
661 |
// in arglist: [0: ...keep1 | dpos: drop... | dpos+dcount: keep2... ] |
|
662 |
// out arglist: [0: ...keep1 | dpos: keep2... ] |
|
663 |
int keep2InPos = dropArgPos + dropArgCount; |
|
664 |
int dropSlot = newType.parameterSlotDepth(keep2InPos); |
|
665 |
int keep1InSlot = newType.parameterSlotDepth(dropArgPos); |
|
666 |
int slotCount = keep1InSlot - dropSlot; |
|
667 |
assert(slotCount >= dropArgCount); |
|
668 |
assert(target.type().parameterSlotCount() + slotCount == newType.parameterSlotCount()); |
|
669 |
long conv = makeConv(OP_DROP_ARGS, dropArgPos + dropArgCount - 1, -slotCount); |
|
670 |
return new AdapterMethodHandle(target, newType, conv); |
|
671 |
} |
|
672 |
||
673 |
/** Can an adapter duplicate an argument to convert the target to newType? */ |
|
674 |
public static boolean canDupArguments(MethodType newType, MethodType targetType, |
|
675 |
int dupArgPos, int dupArgCount) { |
|
676 |
if (!convOpSupported(OP_DUP_ARGS)) return false; |
|
677 |
if (diffReturnTypes(newType, targetType, false) != 0) |
|
678 |
return false; |
|
679 |
int nptypes = newType.parameterCount(); |
|
680 |
if (dupArgCount < 0 || dupArgPos + dupArgCount > nptypes) |
|
681 |
return false; |
|
682 |
if (targetType.parameterCount() != nptypes + dupArgCount) |
|
683 |
return false; |
|
684 |
// parameter types must be the same up to the duplicated arguments |
|
685 |
if (diffParamTypes(newType, 0, targetType, 0, nptypes, false) != 0) |
|
686 |
return false; |
|
687 |
// duplicated types must be, well, duplicates |
|
688 |
if (diffParamTypes(newType, dupArgPos, targetType, nptypes, dupArgCount, false) != 0) |
|
689 |
return false; |
|
690 |
return true; |
|
691 |
} |
|
692 |
||
693 |
/** Factory method: Duplicate the selected argument. |
|
694 |
* Return null if this is not possible. |
|
695 |
*/ |
|
696 |
public static MethodHandle makeDupArguments(Access token, |
|
697 |
MethodType newType, MethodHandle target, |
|
698 |
int dupArgPos, int dupArgCount) { |
|
699 |
Access.check(token); |
|
700 |
if (!canDupArguments(newType, target.type(), dupArgPos, dupArgCount)) |
|
2707
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
701 |
return null; |
4537 | 702 |
if (dupArgCount == 0) |
703 |
return target; |
|
704 |
// in arglist: [0: ...keep1 | dpos: dup... | dpos+dcount: keep2... ] |
|
705 |
// out arglist: [0: ...keep1 | dpos: dup... | dpos+dcount: keep2... | dup... ] |
|
706 |
int keep2InPos = dupArgPos + dupArgCount; |
|
707 |
int dupSlot = newType.parameterSlotDepth(keep2InPos); |
|
708 |
int keep1InSlot = newType.parameterSlotDepth(dupArgPos); |
|
709 |
int slotCount = keep1InSlot - dupSlot; |
|
710 |
assert(target.type().parameterSlotCount() - slotCount == newType.parameterSlotCount()); |
|
711 |
long conv = makeConv(OP_DUP_ARGS, dupArgPos + dupArgCount - 1, slotCount); |
|
712 |
return new AdapterMethodHandle(target, newType, conv); |
|
713 |
} |
|
714 |
||
715 |
/** Can an adapter swap two arguments to convert the target to newType? */ |
|
716 |
public static boolean canSwapArguments(MethodType newType, MethodType targetType, |
|
717 |
int swapArg1, int swapArg2) { |
|
718 |
if (!convOpSupported(OP_SWAP_ARGS)) return false; |
|
719 |
if (diffReturnTypes(newType, targetType, false) != 0) |
|
720 |
return false; |
|
721 |
if (swapArg1 >= swapArg2) return false; // caller resp |
|
722 |
int nptypes = newType.parameterCount(); |
|
723 |
if (targetType.parameterCount() != nptypes) |
|
724 |
return false; |
|
725 |
if (swapArg1 < 0 || swapArg2 >= nptypes) |
|
726 |
return false; |
|
727 |
if (diffParamTypes(newType, 0, targetType, 0, swapArg1, false) != 0) |
|
728 |
return false; |
|
729 |
if (diffParamTypes(newType, swapArg1, targetType, swapArg2, 1, false) != 0) |
|
730 |
return false; |
|
731 |
if (diffParamTypes(newType, swapArg1+1, targetType, swapArg1+1, swapArg2-swapArg1-1, false) != 0) |
|
732 |
return false; |
|
733 |
if (diffParamTypes(newType, swapArg2, targetType, swapArg1, 1, false) != 0) |
|
734 |
return false; |
|
735 |
if (diffParamTypes(newType, swapArg2+1, targetType, swapArg2+1, nptypes-swapArg2-1, false) != 0) |
|
736 |
return false; |
|
737 |
return true; |
|
738 |
} |
|
739 |
||
740 |
/** Factory method: Swap the selected arguments. |
|
741 |
* Return null if this is not possible. |
|
742 |
*/ |
|
743 |
public static MethodHandle makeSwapArguments(Access token, |
|
744 |
MethodType newType, MethodHandle target, |
|
745 |
int swapArg1, int swapArg2) { |
|
746 |
Access.check(token); |
|
747 |
if (swapArg1 == swapArg2) |
|
748 |
return target; |
|
749 |
if (swapArg1 > swapArg2) { int t = swapArg1; swapArg1 = swapArg2; swapArg2 = t; } |
|
750 |
if (!canSwapArguments(newType, target.type(), swapArg1, swapArg2)) |
|
751 |
return null; |
|
752 |
Class<?> swapType = newType.parameterType(swapArg1); |
|
753 |
// in arglist: [0: ...keep1 | pos1: a1 | pos1+1: keep2... | pos2: a2 | pos2+1: keep3... ] |
|
754 |
// out arglist: [0: ...keep1 | pos1: a2 | pos1+1: keep2... | pos2: a1 | pos2+1: keep3... ] |
|
755 |
int swapSlot2 = newType.parameterSlotDepth(swapArg2 + 1); |
|
756 |
long conv = makeSwapConv(OP_SWAP_ARGS, swapArg1, basicType(swapType), swapSlot2); |
|
757 |
return new AdapterMethodHandle(target, newType, conv); |
|
758 |
} |
|
759 |
||
760 |
static int positiveRotation(int argCount, int rotateBy) { |
|
761 |
assert(argCount > 0); |
|
762 |
if (rotateBy >= 0) { |
|
763 |
if (rotateBy < argCount) |
|
764 |
return rotateBy; |
|
765 |
return rotateBy % argCount; |
|
766 |
} else if (rotateBy >= -argCount) { |
|
767 |
return rotateBy + argCount; |
|
2707
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
768 |
} else { |
4537 | 769 |
return (-1-((-1-rotateBy) % argCount)) + argCount; |
2707
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
770 |
} |
4537 | 771 |
} |
772 |
||
773 |
final static int MAX_ARG_ROTATION = 1; |
|
774 |
||
775 |
/** Can an adapter rotate arguments to convert the target to newType? */ |
|
776 |
public static boolean canRotateArguments(MethodType newType, MethodType targetType, |
|
777 |
int firstArg, int argCount, int rotateBy) { |
|
778 |
if (!convOpSupported(OP_ROT_ARGS)) return false; |
|
779 |
if (argCount <= 2) return false; // must be a swap, not a rotate |
|
780 |
rotateBy = positiveRotation(argCount, rotateBy); |
|
781 |
if (rotateBy == 0) return false; // no rotation |
|
782 |
if (rotateBy > MAX_ARG_ROTATION && rotateBy < argCount - MAX_ARG_ROTATION) |
|
783 |
return false; // too many argument positions |
|
784 |
// Rotate incoming args right N to the out args, N in 1..(argCouunt-1). |
|
785 |
if (diffReturnTypes(newType, targetType, false) != 0) |
|
786 |
return false; |
|
787 |
int nptypes = newType.parameterCount(); |
|
788 |
if (targetType.parameterCount() != nptypes) |
|
789 |
return false; |
|
790 |
if (firstArg < 0 || firstArg >= nptypes) return false; |
|
791 |
int argLimit = firstArg + argCount; |
|
792 |
if (argLimit > nptypes) return false; |
|
793 |
if (diffParamTypes(newType, 0, targetType, 0, firstArg, false) != 0) |
|
794 |
return false; |
|
795 |
int newChunk1 = argCount - rotateBy, newChunk2 = rotateBy; |
|
796 |
// swap new chunk1 with target chunk2 |
|
797 |
if (diffParamTypes(newType, firstArg, targetType, argLimit-newChunk1, newChunk1, false) != 0) |
|
798 |
return false; |
|
799 |
// swap new chunk2 with target chunk1 |
|
800 |
if (diffParamTypes(newType, firstArg+newChunk1, targetType, firstArg, newChunk2, false) != 0) |
|
801 |
return false; |
|
802 |
return true; |
|
803 |
} |
|
804 |
||
805 |
/** Factory method: Rotate the selected argument range. |
|
806 |
* Return null if this is not possible. |
|
807 |
*/ |
|
808 |
public static MethodHandle makeRotateArguments(Access token, |
|
809 |
MethodType newType, MethodHandle target, |
|
810 |
int firstArg, int argCount, int rotateBy) { |
|
811 |
Access.check(token); |
|
812 |
rotateBy = positiveRotation(argCount, rotateBy); |
|
813 |
if (!canRotateArguments(newType, target.type(), firstArg, argCount, rotateBy)) |
|
814 |
return null; |
|
815 |
// Decide whether it should be done as a right or left rotation, |
|
816 |
// on the JVM stack. Return the number of stack slots to rotate by, |
|
817 |
// positive if right, negative if left. |
|
818 |
int limit = firstArg + argCount; |
|
819 |
int depth0 = newType.parameterSlotDepth(firstArg); |
|
820 |
int depth1 = newType.parameterSlotDepth(limit-rotateBy); |
|
821 |
int depth2 = newType.parameterSlotDepth(limit); |
|
822 |
int chunk1Slots = depth0 - depth1; assert(chunk1Slots > 0); |
|
823 |
int chunk2Slots = depth1 - depth2; assert(chunk2Slots > 0); |
|
824 |
// From here on out, it assumes a single-argument shift. |
|
825 |
assert(MAX_ARG_ROTATION == 1); |
|
826 |
int srcArg, dstArg; |
|
827 |
byte basicType; |
|
828 |
if (chunk2Slots <= chunk1Slots) { |
|
829 |
// Rotate right/down N (rotateBy = +N, N small, c2 small): |
|
830 |
// in arglist: [0: ...keep1 | arg1: c1... | limit-N: c2 | limit: keep2... ] |
|
831 |
// out arglist: [0: ...keep1 | arg1: c2 | arg1+N: c1... | limit: keep2... ] |
|
832 |
srcArg = limit-1; |
|
833 |
dstArg = firstArg; |
|
834 |
basicType = basicType(newType.parameterType(srcArg)); |
|
835 |
assert(chunk2Slots == type2size(basicType)); |
|
836 |
} else { |
|
837 |
// Rotate left/up N (rotateBy = -N, N small, c1 small): |
|
838 |
// in arglist: [0: ...keep1 | arg1: c1 | arg1+N: c2... | limit: keep2... ] |
|
839 |
// out arglist: [0: ...keep1 | arg1: c2 ... | limit-N: c1 | limit: keep2... ] |
|
840 |
srcArg = firstArg; |
|
841 |
dstArg = limit-1; |
|
842 |
basicType = basicType(newType.parameterType(srcArg)); |
|
843 |
assert(chunk1Slots == type2size(basicType)); |
|
844 |
} |
|
845 |
int dstSlot = newType.parameterSlotDepth(dstArg + 1); |
|
846 |
long conv = makeSwapConv(OP_ROT_ARGS, srcArg, basicType, dstSlot); |
|
847 |
return new AdapterMethodHandle(target, newType, conv); |
|
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|
848 |
} |
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|
849 |
|
5a17df307cbc
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|
850 |
/** Can an adapter spread an argument to convert the target to newType? */ |
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|
851 |
public static boolean canSpreadArguments(MethodType newType, MethodType targetType, |
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|
852 |
Class<?> spreadArgType, int spreadArgPos, int spreadArgCount) { |
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|
853 |
if (!convOpSupported(OP_SPREAD_ARGS)) return false; |
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|
854 |
if (diffReturnTypes(newType, targetType, false) != 0) |
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6829144: JSR 292 JVM features need a provisional Java API
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|
855 |
return false; |
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changeset
|
856 |
int nptypes = newType.parameterCount(); |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
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parents:
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|
857 |
// parameter types must be the same up to the spread point |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
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|
858 |
if (spreadArgPos != 0 && diffParamTypes(newType, 0, targetType, 0, spreadArgPos, false) != 0) |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
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|
859 |
return false; |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
860 |
int afterPos = spreadArgPos + spreadArgCount; |
4537 | 861 |
int afterCount = nptypes - (spreadArgPos + 1); |
2707
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|
862 |
if (spreadArgPos < 0 || spreadArgPos >= nptypes || |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
863 |
spreadArgCount < 0 || |
4537 | 864 |
targetType.parameterCount() != afterPos + afterCount) |
2707
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
865 |
return false; |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
866 |
// parameter types after the spread point must also be the same |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
867 |
if (afterCount != 0 && diffParamTypes(newType, spreadArgPos+1, targetType, afterPos, afterCount, false) != 0) |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
868 |
return false; |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
869 |
// match the array element type to the spread arg types |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
870 |
Class<?> rawSpreadArgType = newType.parameterType(spreadArgPos); |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
871 |
if (rawSpreadArgType != spreadArgType && !canCheckCast(rawSpreadArgType, spreadArgType)) |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
872 |
return false; |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
873 |
for (int i = 0; i < spreadArgCount; i++) { |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
874 |
Class<?> src = VerifyType.spreadArgElementType(spreadArgType, i); |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
875 |
Class<?> dst = targetType.parameterType(spreadArgPos + i); |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
876 |
if (src == null || !VerifyType.isNullConversion(src, dst)) |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
877 |
return false; |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
878 |
} |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
879 |
return true; |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
880 |
} |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
881 |
|
4537 | 882 |
|
2707
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
883 |
/** Factory method: Spread selected argument. */ |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
884 |
public static MethodHandle makeSpreadArguments(Access token, |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
885 |
MethodType newType, MethodHandle target, |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
886 |
Class<?> spreadArgType, int spreadArgPos, int spreadArgCount) { |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
887 |
Access.check(token); |
4537 | 888 |
MethodType targetType = target.type(); |
889 |
if (!canSpreadArguments(newType, targetType, spreadArgType, spreadArgPos, spreadArgCount)) |
|
2707
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
890 |
return null; |
4537 | 891 |
// in arglist: [0: ...keep1 | spos: spreadArg | spos+1: keep2... ] |
892 |
// out arglist: [0: ...keep1 | spos: spread... | spos+scount: keep2... ] |
|
893 |
int keep2OutPos = spreadArgPos + spreadArgCount; |
|
894 |
int spreadSlot = targetType.parameterSlotDepth(keep2OutPos); |
|
895 |
int keep1OutSlot = targetType.parameterSlotDepth(spreadArgPos); |
|
896 |
int slotCount = keep1OutSlot - spreadSlot; |
|
897 |
assert(spreadSlot == newType.parameterSlotDepth(spreadArgPos+1)); |
|
898 |
assert(slotCount >= spreadArgCount); |
|
899 |
long conv = makeConv(OP_SPREAD_ARGS, spreadArgPos, slotCount-1); |
|
900 |
MethodHandle res = new AdapterMethodHandle(target, newType, conv, spreadArgType); |
|
901 |
assert(res.type().parameterType(spreadArgPos) == spreadArgType); |
|
902 |
return res; |
|
2707
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
903 |
} |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
904 |
|
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
905 |
// TO DO: makeCollectArguments, makeFlyby, makeRicochet |
4537 | 906 |
|
907 |
@Override |
|
908 |
public String toString() { |
|
909 |
return nonAdapter((MethodHandle)vmtarget).toString(); |
|
910 |
} |
|
911 |
||
912 |
private static MethodHandle nonAdapter(MethodHandle mh) { |
|
913 |
while (mh instanceof AdapterMethodHandle) { |
|
914 |
mh = (MethodHandle) mh.vmtarget; |
|
915 |
} |
|
916 |
return mh; |
|
917 |
} |
|
2707
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
918 |
} |