author | attila |
Wed, 03 Jul 2013 12:39:28 +0200 | |
changeset 18841 | 9bbc4b8832b2 |
parent 16245 | 6a1c6c8bc113 |
child 24778 | 2ff5d7041566 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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|
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/* |
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* This file is available under and governed by the GNU General Public |
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* License version 2 only, as published by the Free Software Foundation. |
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* However, the following notice accompanied the original version of this |
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* file, and Oracle licenses the original version of this file under the BSD |
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* license: |
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*/ |
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/* |
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Copyright 2009-2013 Attila Szegedi |
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|
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Licensed under both the Apache License, Version 2.0 (the "Apache License") |
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and the BSD License (the "BSD License"), with licensee being free to |
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choose either of the two at their discretion. |
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|
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You may not use this file except in compliance with either the Apache |
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License or the BSD License. |
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|
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If you choose to use this file in compliance with the Apache License, the |
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following notice applies to you: |
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|
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You may obtain a copy of the Apache License at |
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|
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http://www.apache.org/licenses/LICENSE-2.0 |
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|
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Unless required by applicable law or agreed to in writing, software |
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distributed under the License is distributed on an "AS IS" BASIS, |
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or |
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implied. See the License for the specific language governing |
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permissions and limitations under the License. |
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|
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If you choose to use this file in compliance with the BSD License, the |
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following notice applies to you: |
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|
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Redistribution and use in source and binary forms, with or without |
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modification, are permitted provided that the following conditions are |
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met: |
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* Redistributions of source code must retain the above copyright |
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notice, this list of conditions and the following disclaimer. |
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* Redistributions in binary form must reproduce the above copyright |
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notice, this list of conditions and the following disclaimer in the |
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documentation and/or other materials provided with the distribution. |
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* Neither the name of the copyright holder nor the names of |
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contributors may be used to endorse or promote products derived from |
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this software without specific prior written permission. |
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|
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS |
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IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
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TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A |
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PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDER |
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BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR |
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BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
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WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR |
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OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
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ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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|
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package jdk.internal.dynalink.support; |
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import java.lang.invoke.MethodHandles; |
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import java.lang.invoke.MethodHandles.Lookup; |
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import java.util.Objects; |
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import jdk.internal.dynalink.CallSiteDescriptor; |
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/** |
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* A base class for call site descriptor implementations. Provides reconstruction of the name from the tokens, as well |
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* as a generally useful {@code equals} and {@code hashCode} methods. |
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* @author Attila Szegedi |
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*/ |
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public abstract class AbstractCallSiteDescriptor implements CallSiteDescriptor { |
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@Override |
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public String getName() { |
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return appendName(new StringBuilder(getNameLength())).toString(); |
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} |
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|
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@Override |
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public Lookup getLookup() { |
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return MethodHandles.publicLookup(); |
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} |
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|
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@Override |
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public boolean equals(Object obj) { |
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return obj instanceof CallSiteDescriptor && equals((CallSiteDescriptor)obj); |
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} |
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|
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/** |
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* Returns true if this call site descriptor is equal to the passed call site descriptor. |
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* @param csd the other call site descriptor. |
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* @return true if they are equal. |
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*/ |
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public boolean equals(CallSiteDescriptor csd) { |
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if(csd == null) { |
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return false; |
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} |
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if(csd == this) { |
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return true; |
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} |
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final int ntc = getNameTokenCount(); |
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if(ntc != csd.getNameTokenCount()) { |
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return false; |
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} |
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for(int i = ntc; i-- > 0;) { // Reverse order as variability is higher at the end |
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if(!Objects.equals(getNameToken(i), csd.getNameToken(i))) { |
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return false; |
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} |
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} |
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if(!getMethodType().equals(csd.getMethodType())) { |
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return false; |
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} |
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return lookupsEqual(getLookup(), csd.getLookup()); |
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} |
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|
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@Override |
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public int hashCode() { |
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final MethodHandles.Lookup lookup = getLookup(); |
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int h = lookup.lookupClass().hashCode() + 31 * lookup.lookupModes(); |
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final int c = getNameTokenCount(); |
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for(int i = 0; i < c; ++i) { |
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h = h * 31 + getNameToken(i).hashCode(); |
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} |
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return h * 31 + getMethodType().hashCode(); |
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} |
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|
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@Override |
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public String toString() { |
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final String mt = getMethodType().toString(); |
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final String l = getLookup().toString(); |
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final StringBuilder b = new StringBuilder(l.length() + 1 + mt.length() + getNameLength()); |
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return appendName(b).append(mt).append("@").append(l).toString(); |
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} |
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|
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private int getNameLength() { |
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final int c = getNameTokenCount(); |
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int l = 0; |
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for(int i = 0; i < c; ++i) { |
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l += getNameToken(i).length(); |
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} |
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return l + c - 1; |
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} |
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|
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private StringBuilder appendName(StringBuilder b) { |
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b.append(getNameToken(0)); |
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final int c = getNameTokenCount(); |
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for(int i = 1; i < c; ++i) { |
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b.append(':').append(getNameToken(i)); |
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} |
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return b; |
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} |
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|
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private static boolean lookupsEqual(Lookup l1, Lookup l2) { |
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if(l1 == l2) { |
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return true; |
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} |
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if(l1.lookupClass() != l2.lookupClass()) { |
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return false; |
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183 |
} |
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return l1.lookupModes() == l2.lookupModes(); |
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185 |
} |
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} |