Thu, 24 May 2018 16:39:31 +0800
Merge
aoqi@0 | 1 | /* |
aoqi@0 | 2 | * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved. |
aoqi@0 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
aoqi@0 | 4 | * |
aoqi@0 | 5 | * This code is free software; you can redistribute it and/or modify it |
aoqi@0 | 6 | * under the terms of the GNU General Public License version 2 only, as |
aoqi@0 | 7 | * published by the Free Software Foundation. Oracle designates this |
aoqi@0 | 8 | * particular file as subject to the "Classpath" exception as provided |
aoqi@0 | 9 | * by Oracle in the LICENSE file that accompanied this code. |
aoqi@0 | 10 | * |
aoqi@0 | 11 | * This code is distributed in the hope that it will be useful, but WITHOUT |
aoqi@0 | 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
aoqi@0 | 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
aoqi@0 | 14 | * version 2 for more details (a copy is included in the LICENSE file that |
aoqi@0 | 15 | * accompanied this code). |
aoqi@0 | 16 | * |
aoqi@0 | 17 | * You should have received a copy of the GNU General Public License version |
aoqi@0 | 18 | * 2 along with this work; if not, write to the Free Software Foundation, |
aoqi@0 | 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
aoqi@0 | 20 | * |
aoqi@0 | 21 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
aoqi@0 | 22 | * or visit www.oracle.com if you need additional information or have any |
aoqi@0 | 23 | * questions. |
aoqi@0 | 24 | */ |
aoqi@0 | 25 | |
aoqi@0 | 26 | /* |
aoqi@0 | 27 | * This file is available under and governed by the GNU General Public |
aoqi@0 | 28 | * License version 2 only, as published by the Free Software Foundation. |
aoqi@0 | 29 | * However, the following notice accompanied the original version of this |
aoqi@0 | 30 | * file, and Oracle licenses the original version of this file under the BSD |
aoqi@0 | 31 | * license: |
aoqi@0 | 32 | */ |
aoqi@0 | 33 | /* |
aoqi@0 | 34 | Copyright 2009-2013 Attila Szegedi |
aoqi@0 | 35 | |
aoqi@0 | 36 | Licensed under both the Apache License, Version 2.0 (the "Apache License") |
aoqi@0 | 37 | and the BSD License (the "BSD License"), with licensee being free to |
aoqi@0 | 38 | choose either of the two at their discretion. |
aoqi@0 | 39 | |
aoqi@0 | 40 | You may not use this file except in compliance with either the Apache |
aoqi@0 | 41 | License or the BSD License. |
aoqi@0 | 42 | |
aoqi@0 | 43 | If you choose to use this file in compliance with the Apache License, the |
aoqi@0 | 44 | following notice applies to you: |
aoqi@0 | 45 | |
aoqi@0 | 46 | You may obtain a copy of the Apache License at |
aoqi@0 | 47 | |
aoqi@0 | 48 | http://www.apache.org/licenses/LICENSE-2.0 |
aoqi@0 | 49 | |
aoqi@0 | 50 | Unless required by applicable law or agreed to in writing, software |
aoqi@0 | 51 | distributed under the License is distributed on an "AS IS" BASIS, |
aoqi@0 | 52 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or |
aoqi@0 | 53 | implied. See the License for the specific language governing |
aoqi@0 | 54 | permissions and limitations under the License. |
aoqi@0 | 55 | |
aoqi@0 | 56 | If you choose to use this file in compliance with the BSD License, the |
aoqi@0 | 57 | following notice applies to you: |
aoqi@0 | 58 | |
aoqi@0 | 59 | Redistribution and use in source and binary forms, with or without |
aoqi@0 | 60 | modification, are permitted provided that the following conditions are |
aoqi@0 | 61 | met: |
aoqi@0 | 62 | * Redistributions of source code must retain the above copyright |
aoqi@0 | 63 | notice, this list of conditions and the following disclaimer. |
aoqi@0 | 64 | * Redistributions in binary form must reproduce the above copyright |
aoqi@0 | 65 | notice, this list of conditions and the following disclaimer in the |
aoqi@0 | 66 | documentation and/or other materials provided with the distribution. |
aoqi@0 | 67 | * Neither the name of the copyright holder nor the names of |
aoqi@0 | 68 | contributors may be used to endorse or promote products derived from |
aoqi@0 | 69 | this software without specific prior written permission. |
aoqi@0 | 70 | |
aoqi@0 | 71 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS |
aoqi@0 | 72 | IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
aoqi@0 | 73 | TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A |
aoqi@0 | 74 | PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDER |
aoqi@0 | 75 | BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
aoqi@0 | 76 | CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
aoqi@0 | 77 | SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR |
aoqi@0 | 78 | BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
aoqi@0 | 79 | WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR |
aoqi@0 | 80 | OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
aoqi@0 | 81 | ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
aoqi@0 | 82 | */ |
aoqi@0 | 83 | |
aoqi@0 | 84 | package jdk.internal.dynalink.beans; |
aoqi@0 | 85 | |
aoqi@0 | 86 | import java.lang.invoke.MethodHandle; |
aoqi@0 | 87 | import java.lang.invoke.MethodHandles; |
aoqi@0 | 88 | import java.lang.invoke.MethodType; |
aoqi@0 | 89 | import java.lang.reflect.Array; |
aoqi@0 | 90 | import java.util.StringTokenizer; |
aoqi@0 | 91 | import jdk.internal.dynalink.CallSiteDescriptor; |
aoqi@0 | 92 | import jdk.internal.dynalink.linker.LinkerServices; |
aoqi@0 | 93 | import jdk.internal.dynalink.support.Guards; |
aoqi@0 | 94 | import jdk.internal.dynalink.support.Lookup; |
aoqi@0 | 95 | |
aoqi@0 | 96 | /** |
aoqi@0 | 97 | * Base class for dynamic methods that dispatch to a single target Java method or constructor. Handles adaptation of the |
aoqi@0 | 98 | * target method to a call site type (including mapping variable arity methods to a call site signature with different |
aoqi@0 | 99 | * arity). |
aoqi@0 | 100 | * @author Attila Szegedi |
aoqi@0 | 101 | */ |
aoqi@0 | 102 | abstract class SingleDynamicMethod extends DynamicMethod { |
aoqi@0 | 103 | |
aoqi@0 | 104 | private static final MethodHandle CAN_CONVERT_TO = Lookup.findOwnStatic(MethodHandles.lookup(), "canConvertTo", boolean.class, LinkerServices.class, Class.class, Object.class); |
aoqi@0 | 105 | |
attila@962 | 106 | SingleDynamicMethod(final String name) { |
aoqi@0 | 107 | super(name); |
aoqi@0 | 108 | } |
aoqi@0 | 109 | |
aoqi@0 | 110 | /** |
aoqi@0 | 111 | * Returns true if this method is variable arity. |
aoqi@0 | 112 | * @return true if this method is variable arity. |
aoqi@0 | 113 | */ |
aoqi@0 | 114 | abstract boolean isVarArgs(); |
aoqi@0 | 115 | |
aoqi@0 | 116 | /** |
aoqi@0 | 117 | * Returns this method's native type. |
aoqi@0 | 118 | * @return this method's native type. |
aoqi@0 | 119 | */ |
aoqi@0 | 120 | abstract MethodType getMethodType(); |
aoqi@0 | 121 | |
aoqi@0 | 122 | /** |
aoqi@0 | 123 | * Given a specified lookup, returns a method handle to this method's target. |
aoqi@0 | 124 | * @param lookup the lookup to use. |
aoqi@0 | 125 | * @return the handle to this method's target method. |
aoqi@0 | 126 | */ |
aoqi@0 | 127 | abstract MethodHandle getTarget(MethodHandles.Lookup lookup); |
aoqi@0 | 128 | |
aoqi@0 | 129 | @Override |
attila@962 | 130 | MethodHandle getInvocation(final CallSiteDescriptor callSiteDescriptor, final LinkerServices linkerServices) { |
aoqi@0 | 131 | return getInvocation(getTarget(callSiteDescriptor.getLookup()), callSiteDescriptor.getMethodType(), |
aoqi@0 | 132 | linkerServices); |
aoqi@0 | 133 | } |
aoqi@0 | 134 | |
aoqi@0 | 135 | @Override |
attila@962 | 136 | SingleDynamicMethod getMethodForExactParamTypes(final String paramTypes) { |
aoqi@0 | 137 | return typeMatchesDescription(paramTypes, getMethodType()) ? this : null; |
aoqi@0 | 138 | } |
aoqi@0 | 139 | |
aoqi@0 | 140 | @Override |
attila@962 | 141 | boolean contains(final SingleDynamicMethod method) { |
aoqi@0 | 142 | return getMethodType().parameterList().equals(method.getMethodType().parameterList()); |
aoqi@0 | 143 | } |
aoqi@0 | 144 | |
attila@1539 | 145 | static String getMethodNameWithSignature(final MethodType type, final String methodName, final boolean withReturnType) { |
aoqi@0 | 146 | final String typeStr = type.toString(); |
aoqi@0 | 147 | final int retTypeIndex = typeStr.lastIndexOf(')') + 1; |
aoqi@0 | 148 | int secondParamIndex = typeStr.indexOf(',') + 1; |
aoqi@0 | 149 | if(secondParamIndex == 0) { |
aoqi@0 | 150 | secondParamIndex = retTypeIndex - 1; |
aoqi@0 | 151 | } |
attila@1539 | 152 | final StringBuilder b = new StringBuilder(); |
attila@1539 | 153 | if (withReturnType) { |
attila@1539 | 154 | b.append(typeStr, retTypeIndex, typeStr.length()).append(' '); |
attila@1539 | 155 | } |
attila@1539 | 156 | return b.append(methodName).append('(').append(typeStr, secondParamIndex, retTypeIndex).toString(); |
aoqi@0 | 157 | } |
aoqi@0 | 158 | |
aoqi@0 | 159 | /** |
aoqi@0 | 160 | * Given a method handle and a call site type, adapts the method handle to the call site type. Performs type |
aoqi@0 | 161 | * conversions as needed using the specified linker services, and in case that the method handle is a vararg |
attila@963 | 162 | * collector, matches it to the arity of the call site. The type of the return value is only changed if it can be |
attila@963 | 163 | * converted using a conversion that loses neither precision nor magnitude, see |
attila@963 | 164 | * {@link LinkerServices#asTypeLosslessReturn(MethodHandle, MethodType)}. |
aoqi@0 | 165 | * @param target the method handle to adapt |
aoqi@0 | 166 | * @param callSiteType the type of the call site |
aoqi@0 | 167 | * @param linkerServices the linker services used for type conversions |
aoqi@0 | 168 | * @return the adapted method handle. |
aoqi@0 | 169 | */ |
attila@962 | 170 | static MethodHandle getInvocation(final MethodHandle target, final MethodType callSiteType, final LinkerServices linkerServices) { |
attila@1239 | 171 | final MethodHandle filteredTarget = linkerServices.filterInternalObjects(target); |
attila@1239 | 172 | final MethodType methodType = filteredTarget.type(); |
aoqi@0 | 173 | final int paramsLen = methodType.parameterCount(); |
aoqi@0 | 174 | final boolean varArgs = target.isVarargsCollector(); |
attila@1239 | 175 | final MethodHandle fixTarget = varArgs ? filteredTarget.asFixedArity() : filteredTarget; |
aoqi@0 | 176 | final int fixParamsLen = varArgs ? paramsLen - 1 : paramsLen; |
aoqi@0 | 177 | final int argsLen = callSiteType.parameterCount(); |
aoqi@0 | 178 | if(argsLen < fixParamsLen) { |
aoqi@0 | 179 | // Less actual arguments than number of fixed declared arguments; can't invoke. |
aoqi@0 | 180 | return null; |
aoqi@0 | 181 | } |
aoqi@0 | 182 | // Method handle has the same number of fixed arguments as the call site type |
aoqi@0 | 183 | if(argsLen == fixParamsLen) { |
aoqi@0 | 184 | // Method handle that matches the number of actual arguments as the number of fixed arguments |
aoqi@0 | 185 | final MethodHandle matchedMethod; |
aoqi@0 | 186 | if(varArgs) { |
aoqi@0 | 187 | // If vararg, add a zero-length array of the expected type as the last argument to signify no variable |
aoqi@0 | 188 | // arguments. |
aoqi@0 | 189 | matchedMethod = MethodHandles.insertArguments(fixTarget, fixParamsLen, Array.newInstance( |
aoqi@0 | 190 | methodType.parameterType(fixParamsLen).getComponentType(), 0)); |
aoqi@0 | 191 | } else { |
aoqi@0 | 192 | // Otherwise, just use the method |
aoqi@0 | 193 | matchedMethod = fixTarget; |
aoqi@0 | 194 | } |
aoqi@0 | 195 | return createConvertingInvocation(matchedMethod, linkerServices, callSiteType); |
aoqi@0 | 196 | } |
aoqi@0 | 197 | |
aoqi@0 | 198 | // What's below only works for varargs |
aoqi@0 | 199 | if(!varArgs) { |
aoqi@0 | 200 | return null; |
aoqi@0 | 201 | } |
aoqi@0 | 202 | |
aoqi@0 | 203 | final Class<?> varArgType = methodType.parameterType(fixParamsLen); |
aoqi@0 | 204 | // Handle a somewhat sinister corner case: caller passes exactly one argument in the vararg position, and we |
aoqi@0 | 205 | // must handle both a prepacked vararg array as well as a genuine 1-long vararg sequence. |
aoqi@0 | 206 | if(argsLen == paramsLen) { |
aoqi@0 | 207 | final Class<?> callSiteLastArgType = callSiteType.parameterType(fixParamsLen); |
aoqi@0 | 208 | if(varArgType.isAssignableFrom(callSiteLastArgType)) { |
aoqi@0 | 209 | // Call site signature guarantees we'll always be passed a single compatible array; just link directly |
aoqi@0 | 210 | // to the method, introducing necessary conversions. Also, preserve it being a variable arity method. |
attila@1239 | 211 | return createConvertingInvocation(filteredTarget, linkerServices, callSiteType).asVarargsCollector( |
aoqi@0 | 212 | callSiteLastArgType); |
aoqi@0 | 213 | } |
aoqi@0 | 214 | |
aoqi@0 | 215 | // This method handle takes the single argument and packs it into a newly allocated single-element array. It |
aoqi@0 | 216 | // will be used when the incoming argument can't be converted to the vararg array type (the "vararg packer" |
aoqi@0 | 217 | // method). |
aoqi@0 | 218 | final MethodHandle varArgCollectingInvocation = createConvertingInvocation(collectArguments(fixTarget, |
aoqi@0 | 219 | argsLen), linkerServices, callSiteType); |
aoqi@0 | 220 | |
aoqi@0 | 221 | // Is call site type assignable from an array type (e.g. Object:int[], or Object[]:String[]) |
aoqi@0 | 222 | final boolean isAssignableFromArray = callSiteLastArgType.isAssignableFrom(varArgType); |
aoqi@0 | 223 | // Do we have a custom conversion that can potentially convert the call site type to an array? |
aoqi@0 | 224 | final boolean isCustomConvertible = linkerServices.canConvert(callSiteLastArgType, varArgType); |
aoqi@0 | 225 | if(!isAssignableFromArray && !isCustomConvertible) { |
aoqi@0 | 226 | // Call site signature guarantees the argument can definitely not be converted to an array (i.e. it is |
aoqi@0 | 227 | // primitive), and no conversion can help with it either. Link immediately to a vararg-packing method |
aoqi@0 | 228 | // handle. |
aoqi@0 | 229 | return varArgCollectingInvocation; |
aoqi@0 | 230 | } |
aoqi@0 | 231 | |
aoqi@0 | 232 | // This method handle employs language-specific conversions to convert the last argument into an array of |
aoqi@0 | 233 | // vararg type. |
aoqi@0 | 234 | final MethodHandle arrayConvertingInvocation = createConvertingInvocation(MethodHandles.filterArguments( |
aoqi@0 | 235 | fixTarget, fixParamsLen, linkerServices.getTypeConverter(callSiteLastArgType, varArgType)), |
aoqi@0 | 236 | linkerServices, callSiteType); |
aoqi@0 | 237 | |
aoqi@0 | 238 | // This method handle determines whether the value can be converted to the array of vararg type using a |
aoqi@0 | 239 | // language-specific conversion. |
aoqi@0 | 240 | final MethodHandle canConvertArgToArray = MethodHandles.insertArguments(CAN_CONVERT_TO, 0, linkerServices, |
aoqi@0 | 241 | varArgType); |
aoqi@0 | 242 | |
aoqi@0 | 243 | // This one adjusts the previous one for the location of the argument and the call site type. |
aoqi@0 | 244 | final MethodHandle canConvertLastArgToArray = MethodHandles.dropArguments(canConvertArgToArray, 0, |
aoqi@0 | 245 | MethodType.genericMethodType(fixParamsLen).parameterList()).asType(callSiteType.changeReturnType(boolean.class)); |
aoqi@0 | 246 | |
aoqi@0 | 247 | // This one takes the previous ones and combines them into a method handle that converts the argument into |
aoqi@0 | 248 | // a vararg array when it can, otherwise falls back to the vararg packer. |
aoqi@0 | 249 | final MethodHandle convertToArrayWhenPossible = MethodHandles.guardWithTest(canConvertLastArgToArray, |
aoqi@0 | 250 | arrayConvertingInvocation, varArgCollectingInvocation); |
aoqi@0 | 251 | |
aoqi@0 | 252 | if(isAssignableFromArray) { |
aoqi@0 | 253 | return MethodHandles.guardWithTest( |
aoqi@0 | 254 | // Is incoming parameter already a compatible array? |
aoqi@0 | 255 | Guards.isInstance(varArgType, fixParamsLen, callSiteType), |
aoqi@0 | 256 | // Yes: just pass it to the method |
aoqi@0 | 257 | createConvertingInvocation(fixTarget, linkerServices, callSiteType), |
aoqi@0 | 258 | // No: either go through a custom conversion, or if it is not possible, go directly to the |
aoqi@0 | 259 | // vararg packer. |
aoqi@0 | 260 | isCustomConvertible ? convertToArrayWhenPossible : varArgCollectingInvocation); |
aoqi@0 | 261 | } |
aoqi@0 | 262 | |
aoqi@0 | 263 | // Just do the custom conversion with fallback to the vararg packer logic. |
aoqi@0 | 264 | assert isCustomConvertible; |
aoqi@0 | 265 | return convertToArrayWhenPossible; |
aoqi@0 | 266 | } |
aoqi@0 | 267 | |
aoqi@0 | 268 | // Remaining case: more than one vararg. |
aoqi@0 | 269 | return createConvertingInvocation(collectArguments(fixTarget, argsLen), linkerServices, callSiteType); |
aoqi@0 | 270 | } |
aoqi@0 | 271 | |
aoqi@0 | 272 | @SuppressWarnings("unused") |
attila@962 | 273 | private static boolean canConvertTo(final LinkerServices linkerServices, final Class<?> to, final Object obj) { |
aoqi@0 | 274 | return obj == null ? false : linkerServices.canConvert(obj.getClass(), to); |
aoqi@0 | 275 | } |
aoqi@0 | 276 | |
aoqi@0 | 277 | /** |
aoqi@0 | 278 | * Creates a method handle out of the original target that will collect the varargs for the exact component type of |
aoqi@0 | 279 | * the varArg array. Note that this will nicely trigger language-specific type converters for exactly those varargs |
aoqi@0 | 280 | * for which it is necessary when later passed to linkerServices.convertArguments(). |
aoqi@0 | 281 | * |
aoqi@0 | 282 | * @param target the original method handle |
aoqi@0 | 283 | * @param parameterCount the total number of arguments in the new method handle |
aoqi@0 | 284 | * @return a collecting method handle |
aoqi@0 | 285 | */ |
attila@962 | 286 | static MethodHandle collectArguments(final MethodHandle target, final int parameterCount) { |
aoqi@0 | 287 | final MethodType methodType = target.type(); |
aoqi@0 | 288 | final int fixParamsLen = methodType.parameterCount() - 1; |
aoqi@0 | 289 | final Class<?> arrayType = methodType.parameterType(fixParamsLen); |
aoqi@0 | 290 | return target.asCollector(arrayType, parameterCount - fixParamsLen); |
aoqi@0 | 291 | } |
aoqi@0 | 292 | |
aoqi@0 | 293 | private static MethodHandle createConvertingInvocation(final MethodHandle sizedMethod, |
aoqi@0 | 294 | final LinkerServices linkerServices, final MethodType callSiteType) { |
attila@963 | 295 | return linkerServices.asTypeLosslessReturn(sizedMethod, callSiteType); |
aoqi@0 | 296 | } |
aoqi@0 | 297 | |
attila@962 | 298 | private static boolean typeMatchesDescription(final String paramTypes, final MethodType type) { |
aoqi@0 | 299 | final StringTokenizer tok = new StringTokenizer(paramTypes, ", "); |
aoqi@0 | 300 | for(int i = 1; i < type.parameterCount(); ++i) { // i = 1 as we ignore the receiver |
aoqi@0 | 301 | if(!(tok.hasMoreTokens() && typeNameMatches(tok.nextToken(), type.parameterType(i)))) { |
aoqi@0 | 302 | return false; |
aoqi@0 | 303 | } |
aoqi@0 | 304 | } |
aoqi@0 | 305 | return !tok.hasMoreTokens(); |
aoqi@0 | 306 | } |
aoqi@0 | 307 | |
attila@962 | 308 | private static boolean typeNameMatches(final String typeName, final Class<?> type) { |
aoqi@0 | 309 | return typeName.equals(typeName.indexOf('.') == -1 ? type.getSimpleName() : type.getCanonicalName()); |
aoqi@0 | 310 | } |
aoqi@0 | 311 | } |