Mercurial > hg > graal-compiler
view graal/com.oracle.truffle.api.dsl/src/com/oracle/truffle/api/dsl/TypeCheck.java @ 20133:d7d33c72fdc8
Truffle: cache threshold in constant to speed up defer compilation check.
author | Christian Humer <christian.humer@gmail.com> |
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date | Thu, 02 Apr 2015 16:30:52 +0200 |
parents | 3ea386a1036f |
children |
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/* * Copyright (c) 2012, 2012, 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. */ package com.oracle.truffle.api.dsl; import java.lang.annotation.*; /** * Overrides the standard way of checking for a certain type in a {@link TypeSystem}. This is useful * for types where the guest language specific type check can be implemented more efficiently than a * direct cast. The annotated method must be contained in a {@link TypeSystem} annotated class. Type * checks must conform to the following signature: <code>public static boolean is{TypeName}(Object * value)</code>. The checked type must be a type declared in the {@link TypeSystem}. * * <p> * If no {@link TypeCheck} is declared then the type system implicitly uses a type check that can be * declared as follows: * * <pre> * {@literal @}TypeCheck(Type.class) * public static boolean isType(Object value) { * return value instanceof Type; * } * </pre> * * @see TypeCast */ @Retention(RetentionPolicy.CLASS) @Target({ElementType.METHOD}) public @interface TypeCheck { Class<?> value(); }