Mon, 21 Nov 2016 23:13:27 -0800
Merge
attila@90 | 1 | /* |
attila@90 | 2 | * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved. |
attila@90 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
attila@90 | 4 | * |
attila@90 | 5 | * This code is free software; you can redistribute it and/or modify it |
attila@90 | 6 | * under the terms of the GNU General Public License version 2 only, as |
attila@90 | 7 | * published by the Free Software Foundation. Oracle designates this |
attila@90 | 8 | * particular file as subject to the "Classpath" exception as provided |
attila@90 | 9 | * by Oracle in the LICENSE file that accompanied this code. |
attila@90 | 10 | * |
attila@90 | 11 | * This code is distributed in the hope that it will be useful, but WITHOUT |
attila@90 | 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
attila@90 | 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
attila@90 | 14 | * version 2 for more details (a copy is included in the LICENSE file that |
attila@90 | 15 | * accompanied this code). |
attila@90 | 16 | * |
attila@90 | 17 | * You should have received a copy of the GNU General Public License version |
attila@90 | 18 | * 2 along with this work; if not, write to the Free Software Foundation, |
attila@90 | 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
attila@90 | 20 | * |
attila@90 | 21 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
attila@90 | 22 | * or visit www.oracle.com if you need additional information or have any |
attila@90 | 23 | * questions. |
attila@90 | 24 | */ |
attila@90 | 25 | |
attila@90 | 26 | /* |
attila@90 | 27 | * This file is available under and governed by the GNU General Public |
attila@90 | 28 | * License version 2 only, as published by the Free Software Foundation. |
attila@90 | 29 | * However, the following notice accompanied the original version of this |
attila@90 | 30 | * file, and Oracle licenses the original version of this file under the BSD |
attila@90 | 31 | * license: |
attila@90 | 32 | */ |
attila@90 | 33 | /* |
attila@90 | 34 | Copyright 2009-2013 Attila Szegedi |
attila@90 | 35 | |
attila@90 | 36 | Licensed under both the Apache License, Version 2.0 (the "Apache License") |
attila@90 | 37 | and the BSD License (the "BSD License"), with licensee being free to |
attila@90 | 38 | choose either of the two at their discretion. |
attila@90 | 39 | |
attila@90 | 40 | You may not use this file except in compliance with either the Apache |
attila@90 | 41 | License or the BSD License. |
attila@90 | 42 | |
attila@90 | 43 | If you choose to use this file in compliance with the Apache License, the |
attila@90 | 44 | following notice applies to you: |
attila@90 | 45 | |
attila@90 | 46 | You may obtain a copy of the Apache License at |
attila@90 | 47 | |
attila@90 | 48 | http://www.apache.org/licenses/LICENSE-2.0 |
attila@90 | 49 | |
attila@90 | 50 | Unless required by applicable law or agreed to in writing, software |
attila@90 | 51 | distributed under the License is distributed on an "AS IS" BASIS, |
attila@90 | 52 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or |
attila@90 | 53 | implied. See the License for the specific language governing |
attila@90 | 54 | permissions and limitations under the License. |
attila@90 | 55 | |
attila@90 | 56 | If you choose to use this file in compliance with the BSD License, the |
attila@90 | 57 | following notice applies to you: |
attila@90 | 58 | |
attila@90 | 59 | Redistribution and use in source and binary forms, with or without |
attila@90 | 60 | modification, are permitted provided that the following conditions are |
attila@90 | 61 | met: |
attila@90 | 62 | * Redistributions of source code must retain the above copyright |
attila@90 | 63 | notice, this list of conditions and the following disclaimer. |
attila@90 | 64 | * Redistributions in binary form must reproduce the above copyright |
attila@90 | 65 | notice, this list of conditions and the following disclaimer in the |
attila@90 | 66 | documentation and/or other materials provided with the distribution. |
attila@90 | 67 | * Neither the name of the copyright holder nor the names of |
attila@90 | 68 | contributors may be used to endorse or promote products derived from |
attila@90 | 69 | this software without specific prior written permission. |
attila@90 | 70 | |
attila@90 | 71 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS |
attila@90 | 72 | IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
attila@90 | 73 | TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A |
attila@90 | 74 | PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDER |
attila@90 | 75 | BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
attila@90 | 76 | CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
attila@90 | 77 | SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR |
attila@90 | 78 | BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
attila@90 | 79 | WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR |
attila@90 | 80 | OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
attila@90 | 81 | ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
attila@90 | 82 | */ |
attila@90 | 83 | |
attila@90 | 84 | package jdk.internal.dynalink; |
attila@90 | 85 | |
attila@90 | 86 | import java.lang.invoke.MethodHandle; |
attila@90 | 87 | import java.lang.invoke.MethodHandles; |
attila@90 | 88 | import java.lang.invoke.MethodType; |
attila@90 | 89 | import java.lang.invoke.MutableCallSite; |
attila@90 | 90 | import java.util.List; |
sundar@1231 | 91 | import java.util.Objects; |
attila@90 | 92 | import jdk.internal.dynalink.linker.GuardedInvocation; |
attila@90 | 93 | import jdk.internal.dynalink.linker.GuardingDynamicLinker; |
attila@90 | 94 | import jdk.internal.dynalink.linker.LinkRequest; |
attila@90 | 95 | import jdk.internal.dynalink.linker.LinkerServices; |
attila@90 | 96 | import jdk.internal.dynalink.support.CallSiteDescriptorFactory; |
attila@90 | 97 | import jdk.internal.dynalink.support.LinkRequestImpl; |
attila@90 | 98 | import jdk.internal.dynalink.support.Lookup; |
attila@90 | 99 | import jdk.internal.dynalink.support.RuntimeContextLinkRequestImpl; |
attila@90 | 100 | |
attila@90 | 101 | /** |
mhaupt@1402 | 102 | * The linker for {@link RelinkableCallSite} objects. Users of it (scripting |
mhaupt@1402 | 103 | * frameworks and language runtimes) have to create a linker using the |
mhaupt@1402 | 104 | * {@link DynamicLinkerFactory} and invoke its link method from the invokedynamic |
mhaupt@1402 | 105 | * bootstrap methods to set the target of all the call sites in the code they |
mhaupt@1402 | 106 | * generate. Usual usage would be to create one class per language runtime to |
mhaupt@1402 | 107 | * contain one linker instance as: |
attila@90 | 108 | * |
attila@90 | 109 | * <pre> |
attila@90 | 110 | * class MyLanguageRuntime { |
attila@90 | 111 | * private static final GuardingDynamicLinker myLanguageLinker = new MyLanguageLinker(); |
attila@90 | 112 | * private static final DynamicLinker dynamicLinker = createDynamicLinker(); |
attila@90 | 113 | * |
attila@90 | 114 | * private static DynamicLinker createDynamicLinker() { |
attila@90 | 115 | * final DynamicLinkerFactory factory = new DynamicLinkerFactory(); |
attila@90 | 116 | * factory.setPrioritizedLinker(myLanguageLinker); |
attila@90 | 117 | * return factory.createLinker(); |
attila@90 | 118 | * } |
attila@90 | 119 | * |
sundar@1530 | 120 | * public static CallSite bootstrap(MethodHandles.Lookup lookup, String name, MethodType type) { |
attila@90 | 121 | * return dynamicLinker.link(new MonomorphicCallSite(CallSiteDescriptorFactory.create(lookup, name, type))); |
attila@90 | 122 | * } |
attila@90 | 123 | * } |
attila@90 | 124 | * </pre> |
attila@90 | 125 | * |
attila@90 | 126 | * Note how there are three components you will need to provide here: |
attila@90 | 127 | * <ul> |
mhaupt@1402 | 128 | * |
mhaupt@1402 | 129 | * <li>You're expected to provide a {@link GuardingDynamicLinker} for your own |
mhaupt@1402 | 130 | * language. If your runtime doesn't have its own language and/or object model |
mhaupt@1402 | 131 | * (i.e., it's a generic scripting shell), you don't need to implement a dynamic |
mhaupt@1402 | 132 | * linker; you would simply not invoke the {@code setPrioritizedLinker} method |
mhaupt@1402 | 133 | * on the factory, or even better, simply use {@link DefaultBootstrapper}.</li> |
mhaupt@1402 | 134 | * |
mhaupt@1402 | 135 | * <li>The performance of the programs can depend on your choice of the class to |
mhaupt@1402 | 136 | * represent call sites. The above example used {@link MonomorphicCallSite}, but |
mhaupt@1402 | 137 | * you might want to use {@link ChainedCallSite} instead. You'll need to |
mhaupt@1402 | 138 | * experiment and decide what fits your language runtime the best. You can |
mhaupt@1402 | 139 | * subclass either of these or roll your own if you need to.</li> |
mhaupt@1402 | 140 | * |
mhaupt@1402 | 141 | * <li>You also need to provide {@link CallSiteDescriptor}s to your call sites. |
mhaupt@1402 | 142 | * They are immutable objects that contain all the information about the call |
mhaupt@1402 | 143 | * site: the class performing the lookups, the name of the method being invoked, |
mhaupt@1402 | 144 | * and the method signature. The library has a default {@link CallSiteDescriptorFactory} |
mhaupt@1402 | 145 | * for descriptors that you can use, or you can create your own descriptor |
mhaupt@1402 | 146 | * classes, especially if you need to add further information (values passed in |
attila@90 | 147 | * additional parameters to the bootstrap method) to them.</li> |
mhaupt@1402 | 148 | * |
attila@90 | 149 | * </ul> |
attila@90 | 150 | * |
attila@90 | 151 | * @author Attila Szegedi |
attila@90 | 152 | */ |
attila@90 | 153 | public class DynamicLinker { |
attila@90 | 154 | private static final String CLASS_NAME = DynamicLinker.class.getName(); |
attila@90 | 155 | private static final String RELINK_METHOD_NAME = "relink"; |
attila@90 | 156 | |
attila@443 | 157 | private static final String INITIAL_LINK_CLASS_NAME = "java.lang.invoke.MethodHandleNatives"; |
attila@443 | 158 | private static final String INITIAL_LINK_METHOD_NAME = "linkCallSite"; |
attila@443 | 159 | |
attila@90 | 160 | private final LinkerServices linkerServices; |
attila@963 | 161 | private final GuardedInvocationFilter prelinkFilter; |
attila@90 | 162 | private final int runtimeContextArgCount; |
attila@90 | 163 | private final boolean syncOnRelink; |
attila@90 | 164 | private final int unstableRelinkThreshold; |
attila@90 | 165 | |
attila@90 | 166 | /** |
attila@90 | 167 | * Creates a new dynamic linker. |
attila@90 | 168 | * |
attila@90 | 169 | * @param linkerServices the linkerServices used by the linker, created by the factory. |
attila@963 | 170 | * @param prelinkFilter see {@link DynamicLinkerFactory#setPrelinkFilter(GuardedInvocationFilter)} |
attila@90 | 171 | * @param runtimeContextArgCount see {@link DynamicLinkerFactory#setRuntimeContextArgCount(int)} |
attila@90 | 172 | */ |
attila@963 | 173 | DynamicLinker(final LinkerServices linkerServices, final GuardedInvocationFilter prelinkFilter, final int runtimeContextArgCount, |
attila@963 | 174 | final boolean syncOnRelink, final int unstableRelinkThreshold) { |
attila@90 | 175 | if(runtimeContextArgCount < 0) { |
attila@90 | 176 | throw new IllegalArgumentException("runtimeContextArgCount < 0"); |
attila@90 | 177 | } |
attila@90 | 178 | if(unstableRelinkThreshold < 0) { |
attila@90 | 179 | throw new IllegalArgumentException("unstableRelinkThreshold < 0"); |
attila@90 | 180 | } |
attila@963 | 181 | this.linkerServices = linkerServices; |
attila@963 | 182 | this.prelinkFilter = prelinkFilter; |
attila@90 | 183 | this.runtimeContextArgCount = runtimeContextArgCount; |
attila@90 | 184 | this.syncOnRelink = syncOnRelink; |
attila@90 | 185 | this.unstableRelinkThreshold = unstableRelinkThreshold; |
attila@90 | 186 | } |
attila@90 | 187 | |
attila@90 | 188 | /** |
mhaupt@1402 | 189 | * Links an invokedynamic call site. It will install a method handle into |
mhaupt@1402 | 190 | * the call site that invokes the relinking mechanism of this linker. Next |
mhaupt@1402 | 191 | * time the call site is invoked, it will be linked for the actual arguments |
mhaupt@1402 | 192 | * it was invoked with. |
attila@90 | 193 | * |
mhaupt@1402 | 194 | * @param <T> the particular subclass of {@link RelinkableCallSite} for |
mhaupt@1402 | 195 | * which to create a link. |
attila@90 | 196 | * @param callSite the call site to link. |
mhaupt@1402 | 197 | * |
attila@90 | 198 | * @return the callSite, for easy call chaining. |
attila@90 | 199 | */ |
attila@90 | 200 | public <T extends RelinkableCallSite> T link(final T callSite) { |
attila@90 | 201 | callSite.initialize(createRelinkAndInvokeMethod(callSite, 0)); |
attila@90 | 202 | return callSite; |
attila@90 | 203 | } |
attila@90 | 204 | |
attila@90 | 205 | /** |
mhaupt@1402 | 206 | * Returns the object representing the lower level linker services of this |
mhaupt@1402 | 207 | * class that are normally exposed to individual language-specific linkers. |
mhaupt@1402 | 208 | * While as a user of this class you normally only care about the |
mhaupt@1402 | 209 | * {@link #link(RelinkableCallSite)} method, in certain circumstances you |
mhaupt@1402 | 210 | * might want to use the lower level services directly; either to lookup |
mhaupt@1402 | 211 | * specific method handles, to access the type converters, and so on. |
mhaupt@1402 | 212 | * |
attila@90 | 213 | * @return the object representing the linker services of this class. |
attila@90 | 214 | */ |
attila@90 | 215 | public LinkerServices getLinkerServices() { |
attila@90 | 216 | return linkerServices; |
attila@90 | 217 | } |
attila@90 | 218 | |
attila@90 | 219 | private static final MethodHandle RELINK = Lookup.findOwnSpecial(MethodHandles.lookup(), RELINK_METHOD_NAME, |
attila@90 | 220 | MethodHandle.class, RelinkableCallSite.class, int.class, Object[].class); |
attila@90 | 221 | |
attila@962 | 222 | private MethodHandle createRelinkAndInvokeMethod(final RelinkableCallSite callSite, final int relinkCount) { |
attila@90 | 223 | // Make a bound MH of invoke() for this linker and call site |
attila@90 | 224 | final MethodHandle boundRelinker = MethodHandles.insertArguments(RELINK, 0, this, callSite, Integer.valueOf( |
attila@90 | 225 | relinkCount)); |
attila@90 | 226 | // Make a MH that gathers all arguments to the invocation into an Object[] |
attila@90 | 227 | final MethodType type = callSite.getDescriptor().getMethodType(); |
attila@90 | 228 | final MethodHandle collectingRelinker = boundRelinker.asCollector(Object[].class, type.parameterCount()); |
attila@90 | 229 | return MethodHandles.foldArguments(MethodHandles.exactInvoker(type), collectingRelinker.asType( |
attila@90 | 230 | type.changeReturnType(MethodHandle.class))); |
attila@90 | 231 | } |
attila@90 | 232 | |
attila@90 | 233 | /** |
attila@90 | 234 | * Relinks a call site conforming to the invocation arguments. |
attila@90 | 235 | * |
attila@90 | 236 | * @param callSite the call site itself |
attila@90 | 237 | * @param arguments arguments to the invocation |
mhaupt@1402 | 238 | * |
attila@90 | 239 | * @return return the method handle for the invocation |
mhaupt@1402 | 240 | * |
attila@90 | 241 | * @throws Exception rethrows any exception thrown by the linkers |
attila@90 | 242 | */ |
attila@90 | 243 | @SuppressWarnings("unused") |
attila@962 | 244 | private MethodHandle relink(final RelinkableCallSite callSite, final int relinkCount, final Object... arguments) throws Exception { |
attila@90 | 245 | final CallSiteDescriptor callSiteDescriptor = callSite.getDescriptor(); |
attila@90 | 246 | final boolean unstableDetectionEnabled = unstableRelinkThreshold > 0; |
attila@90 | 247 | final boolean callSiteUnstable = unstableDetectionEnabled && relinkCount >= unstableRelinkThreshold; |
attila@90 | 248 | final LinkRequest linkRequest = |
attila@963 | 249 | runtimeContextArgCount == 0 ? |
attila@963 | 250 | new LinkRequestImpl(callSiteDescriptor, callSite, relinkCount, callSiteUnstable, arguments) : |
attila@963 | 251 | new RuntimeContextLinkRequestImpl(callSiteDescriptor, callSite, relinkCount, callSiteUnstable, arguments, runtimeContextArgCount); |
attila@90 | 252 | |
attila@90 | 253 | GuardedInvocation guardedInvocation = linkerServices.getGuardedInvocation(linkRequest); |
attila@90 | 254 | |
attila@90 | 255 | // None found - throw an exception |
attila@90 | 256 | if(guardedInvocation == null) { |
attila@90 | 257 | throw new NoSuchDynamicMethodException(callSiteDescriptor.toString()); |
attila@90 | 258 | } |
attila@90 | 259 | |
attila@90 | 260 | // If our call sites have a runtime context, and the linker produced a context-stripped invocation, adapt the |
attila@90 | 261 | // produced invocation into contextual invocation (by dropping the context...) |
attila@90 | 262 | if(runtimeContextArgCount > 0) { |
attila@90 | 263 | final MethodType origType = callSiteDescriptor.getMethodType(); |
attila@90 | 264 | final MethodHandle invocation = guardedInvocation.getInvocation(); |
attila@90 | 265 | if(invocation.type().parameterCount() == origType.parameterCount() - runtimeContextArgCount) { |
attila@90 | 266 | final List<Class<?>> prefix = origType.parameterList().subList(1, runtimeContextArgCount + 1); |
attila@90 | 267 | final MethodHandle guard = guardedInvocation.getGuard(); |
attila@90 | 268 | guardedInvocation = guardedInvocation.dropArguments(1, prefix); |
attila@90 | 269 | } |
attila@90 | 270 | } |
attila@90 | 271 | |
attila@963 | 272 | // Make sure we filter the invocation before linking it into the call site. This is typically used to match the |
attila@963 | 273 | // return type of the invocation to the call site. |
attila@963 | 274 | guardedInvocation = prelinkFilter.filter(guardedInvocation, linkRequest, linkerServices); |
sundar@1231 | 275 | Objects.requireNonNull(guardedInvocation); |
attila@963 | 276 | |
attila@101 | 277 | int newRelinkCount = relinkCount; |
attila@101 | 278 | // Note that the short-circuited "&&" evaluation below ensures we'll increment the relinkCount until |
attila@101 | 279 | // threshold + 1 but not beyond that. Threshold + 1 is treated as a special value to signal that resetAndRelink |
attila@101 | 280 | // has already executed once for the unstable call site; we only want the call site to throw away its current |
attila@101 | 281 | // linkage once, when it transitions to unstable. |
attila@101 | 282 | if(unstableDetectionEnabled && newRelinkCount <= unstableRelinkThreshold && newRelinkCount++ == unstableRelinkThreshold) { |
attila@101 | 283 | callSite.resetAndRelink(guardedInvocation, createRelinkAndInvokeMethod(callSite, newRelinkCount)); |
attila@90 | 284 | } else { |
attila@101 | 285 | callSite.relink(guardedInvocation, createRelinkAndInvokeMethod(callSite, newRelinkCount)); |
attila@90 | 286 | } |
attila@90 | 287 | if(syncOnRelink) { |
attila@90 | 288 | MutableCallSite.syncAll(new MutableCallSite[] { (MutableCallSite)callSite }); |
attila@90 | 289 | } |
attila@90 | 290 | return guardedInvocation.getInvocation(); |
attila@90 | 291 | } |
attila@90 | 292 | |
attila@90 | 293 | /** |
mhaupt@1402 | 294 | * Returns a stack trace element describing the location of the call site |
mhaupt@1402 | 295 | * currently being linked on the current thread. The operation internally |
mhaupt@1402 | 296 | * creates a Throwable object and inspects its stack trace, so it's |
mhaupt@1402 | 297 | * potentially expensive. The recommended usage for it is in writing |
mhaupt@1402 | 298 | * diagnostics code. |
mhaupt@1402 | 299 | * |
mhaupt@1402 | 300 | * @return a stack trace element describing the location of the call site |
mhaupt@1402 | 301 | * currently being linked, or null if it is not invoked while a call |
mhaupt@1402 | 302 | * site is being linked. |
attila@90 | 303 | */ |
attila@443 | 304 | public static StackTraceElement getLinkedCallSiteLocation() { |
attila@90 | 305 | final StackTraceElement[] trace = new Throwable().getStackTrace(); |
attila@90 | 306 | for(int i = 0; i < trace.length - 1; ++i) { |
attila@90 | 307 | final StackTraceElement frame = trace[i]; |
attila@443 | 308 | if(isRelinkFrame(frame) || isInitialLinkFrame(frame)) { |
attila@90 | 309 | return trace[i + 1]; |
attila@90 | 310 | } |
attila@90 | 311 | } |
attila@90 | 312 | return null; |
attila@90 | 313 | } |
attila@443 | 314 | |
attila@443 | 315 | /** |
mhaupt@1402 | 316 | * Deprecated because of imprecise name. |
mhaupt@1402 | 317 | * |
attila@443 | 318 | * @deprecated Use {@link #getLinkedCallSiteLocation()} instead. |
mhaupt@1402 | 319 | * |
attila@443 | 320 | * @return see non-deprecated method |
attila@443 | 321 | */ |
attila@443 | 322 | @Deprecated |
attila@443 | 323 | public static StackTraceElement getRelinkedCallSiteLocation() { |
attila@443 | 324 | return getLinkedCallSiteLocation(); |
attila@443 | 325 | } |
attila@443 | 326 | |
attila@443 | 327 | /** |
mhaupt@1402 | 328 | * Returns {@code true} if the frame represents {@code MethodHandleNatives.linkCallSite()}, |
mhaupt@1402 | 329 | * the frame immediately on top of the call site frame when the call site is |
mhaupt@1402 | 330 | * being linked for the first time. |
mhaupt@1402 | 331 | * |
attila@443 | 332 | * @param frame the frame |
mhaupt@1402 | 333 | * |
mhaupt@1402 | 334 | * @return {@code true} if this frame represents {@code MethodHandleNatives.linkCallSite()}. |
attila@443 | 335 | */ |
attila@443 | 336 | private static boolean isInitialLinkFrame(final StackTraceElement frame) { |
attila@443 | 337 | return testFrame(frame, INITIAL_LINK_METHOD_NAME, INITIAL_LINK_CLASS_NAME); |
attila@443 | 338 | } |
attila@443 | 339 | |
attila@443 | 340 | /** |
mhaupt@1402 | 341 | * Returns {@code true} if the frame represents {@code DynamicLinker.relink()}, |
mhaupt@1402 | 342 | * the frame immediately on top of the call site frame when the call site is |
mhaupt@1402 | 343 | * being relinked (linked for second and subsequent times). |
mhaupt@1402 | 344 | * |
attila@443 | 345 | * @param frame the frame |
mhaupt@1402 | 346 | * |
mhaupt@1402 | 347 | * @return {@code true} if this frame represents {@code DynamicLinker.relink()}. |
attila@443 | 348 | */ |
attila@443 | 349 | private static boolean isRelinkFrame(final StackTraceElement frame) { |
attila@443 | 350 | return testFrame(frame, RELINK_METHOD_NAME, CLASS_NAME); |
attila@443 | 351 | } |
attila@443 | 352 | |
attila@443 | 353 | private static boolean testFrame(final StackTraceElement frame, final String methodName, final String className) { |
attila@443 | 354 | return methodName.equals(frame.getMethodName()) && className.equals(frame.getClassName()); |
attila@443 | 355 | } |
attila@90 | 356 | } |