jdk8-mips64-public/nashorn: comparison src/jdk/internal/dynalink/beans/MaximallySpecific.java

-:43e32b36153c
+:5a820fb11814
+/*
+* Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
+* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+*
+* This code is free software; you can redistribute it and/or modify it
+* under the terms of the GNU General Public License version 2 only, as
+* published by the Free Software Foundation.  Oracle designates this
+* particular file as subject to the "Classpath" exception as provided
+* by Oracle in the LICENSE file that accompanied this code.
+*
+* This code is distributed in the hope that it will be useful, but WITHOUT
+* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+* FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+* version 2 for more details (a copy is included in the LICENSE file that
+* accompanied this code).
+*
+* You should have received a copy of the GNU General Public License version
+* 2 along with this work; if not, write to the Free Software Foundation,
+* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+*
+* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+* or visit www.oracle.com if you need additional information or have any
+* questions.
+*/
+/*
+* This file is available under and governed by the GNU General Public
+* License version 2 only, as published by the Free Software Foundation.
+* However, the following notice accompanied the original version of this
+* file, and Oracle licenses the original version of this file under the BSD
+* license:
+*/
+/*
+Copyright 2009-2013 Attila Szegedi
+Licensed under both the Apache License, Version 2.0 (the "Apache License")
+and the BSD License (the "BSD License"), with licensee being free to
+choose either of the two at their discretion.
+You may not use this file except in compliance with either the Apache
+License or the BSD License.
+If you choose to use this file in compliance with the Apache License, the
+following notice applies to you:
+You may obtain a copy of the Apache License at
+http://www.apache.org/licenses/LICENSE-2.0
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+implied. See the License for the specific language governing
+permissions and limitations under the License.
+If you choose to use this file in compliance with the BSD License, the
+following notice applies to you:
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+* Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+* Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+* Neither the name of the copyright holder nor the names of
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDER
+BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+package jdk.internal.dynalink.beans;
+import java.lang.invoke.MethodHandle;
+import java.lang.invoke.MethodType;
+import java.util.Iterator;
+import java.util.LinkedList;
+import java.util.List;
+import jdk.internal.dynalink.linker.ConversionComparator.Comparison;
+import jdk.internal.dynalink.linker.LinkerServices;
+import jdk.internal.dynalink.support.TypeUtilities;
+/**
+* Utility class that encapsulates the algorithm for choosing the maximally specific methods.
+*
+* @author Attila Szegedi
+*/
+class MaximallySpecific {
+/**
+* Given a list of methods, returns a list of maximally specific methods.
+*
+* @param methods the list of methods
+* @param varArgs whether to assume the methods are varargs
+* @return the list of maximally specific methods.
+*/
+static List<MethodHandle> getMaximallySpecificMethods(List<MethodHandle> methods, boolean varArgs) {
+return getMaximallySpecificMethods(methods, varArgs, null, null);
+}
+/**
+* Given a list of methods, returns a list of maximally specific methods, applying language-runtime specific
+* conversion preferences.
+*
+* @param methods the list of methods
+* @param varArgs whether to assume the methods are varargs
+* @param argTypes concrete argument types for the invocation
+* @return the list of maximally specific methods.
+*/
+static List<MethodHandle> getMaximallySpecificMethods(List<MethodHandle> methods, boolean varArgs,
+Class<?>[] argTypes, LinkerServices ls) {
+if(methods.size() < 2) {
+return methods;
+}
+final LinkedList<MethodHandle> maximals = new LinkedList<>();
+for(MethodHandle m: methods) {
+final MethodType methodType = m.type();
+boolean lessSpecific = false;
+for(Iterator<MethodHandle> maximal = maximals.iterator(); maximal.hasNext();) {
+final MethodHandle max = maximal.next();
+switch(isMoreSpecific(methodType, max.type(), varArgs, argTypes, ls)) {
+case TYPE_1_BETTER: {
+maximal.remove();
+break;
+}
+case TYPE_2_BETTER: {
+lessSpecific = true;
+break;
+}
+case INDETERMINATE: {
+// do nothing
+}
+}
+}
+if(!lessSpecific) {
+maximals.addLast(m);
+}
+}
+return maximals;
+}
+private static Comparison isMoreSpecific(MethodType t1, MethodType t2, boolean varArgs, Class<?>[] argTypes,
+LinkerServices ls) {
+final int pc1 = t1.parameterCount();
+final int pc2 = t2.parameterCount();
+assert varArgs || (pc1 == pc2) && (argTypes == null || argTypes.length == pc1);
+assert (argTypes == null) == (ls == null);
+final int maxPc = Math.max(Math.max(pc1, pc2), argTypes == null ? 0 : argTypes.length);
+boolean t1MoreSpecific = false;
+boolean t2MoreSpecific = false;
+// NOTE: Starting from 1 as overloaded method resolution doesn't depend on 0th element, which is the type of
+// 'this'. We're only dealing with instance methods here, not static methods. Actually, static methods will have
+// a fake 'this' of type StaticClass.
+for(int i = 1; i < maxPc; ++i) {
+final Class<?> c1 = getParameterClass(t1, pc1, i, varArgs);
+final Class<?> c2 = getParameterClass(t2, pc2, i, varArgs);
+if(c1 != c2) {
+final Comparison cmp = compare(c1, c2, argTypes, i, ls);
+if(cmp == Comparison.TYPE_1_BETTER && !t1MoreSpecific) {
+t1MoreSpecific = true;
+if(t2MoreSpecific) {
+return Comparison.INDETERMINATE;
+}
+}
+if(cmp == Comparison.TYPE_2_BETTER && !t2MoreSpecific) {
+t2MoreSpecific = true;
+if(t1MoreSpecific) {
+return Comparison.INDETERMINATE;
+}
+}
+}
+}
+if(t1MoreSpecific) {
+return Comparison.TYPE_1_BETTER;
+} else if(t2MoreSpecific) {
+return Comparison.TYPE_2_BETTER;
+}
+return Comparison.INDETERMINATE;
+}
+private static Comparison compare(Class<?> c1, Class<?> c2, Class<?>[] argTypes, int i, LinkerServices cmp) {
+if(cmp != null) {
+final Comparison c = cmp.compareConversion(argTypes[i], c1, c2);
+if(c != Comparison.INDETERMINATE) {
+return c;
+}
+}
+if(TypeUtilities.isSubtype(c1, c2)) {
+return Comparison.TYPE_1_BETTER;
+} if(TypeUtilities.isSubtype(c2, c1)) {
+return Comparison.TYPE_2_BETTER;
+}
+return Comparison.INDETERMINATE;
+}
+private static Class<?> getParameterClass(MethodType t, int l, int i, boolean varArgs) {
+return varArgs && i >= l - 1 ? t.parameterType(l - 1).getComponentType() : t.parameterType(i);
+}
+}

Mercurial > jdk8-mips64-public > nashorn / file comparison

comparison: src/jdk/internal/dynalink/beans/MaximallySpecific.java

src/jdk/internal/dynalink/beans/MaximallySpecific.java