SpecializedFunction.java revision 953:221a84ef44c0
1/* 2 * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26package jdk.nashorn.internal.objects.annotations; 27 28import java.lang.annotation.ElementType; 29import java.lang.annotation.Retention; 30import java.lang.annotation.RetentionPolicy; 31import java.lang.annotation.Target; 32 33/** 34 * The SpecializedFunction annotation is used to flag more type specific functions than the standard one in 35 * Native objects. For example {@link jdk.nashorn.internal.objects.NativeMath#max} takes an arbitrary number of 36 * Object elements as an array. Call this function, including the varargs collector that allocates the array 37 * upon each invocation, is much more expensive than calling a specialized function that takes two arguments 38 * of, e.g. int type from the call site, such as {@link jdk.nashorn.internal.objects.NativeMath#max(Object, int, int)}. 39 * {@link jdk.nashorn.internal.runtime.ScriptFunction} will try to look up the most specific function when 40 * linking the callsite. 41 */ 42@Retention(RetentionPolicy.RUNTIME) 43@Target(ElementType.METHOD) 44public @interface SpecializedFunction { 45 //empty 46} 47