Mercurial > hg > graal-compiler
view graal/com.oracle.truffle.api.dsl/src/com/oracle/truffle/api/dsl/TypeSystem.java @ 19513:3446ae32a2d8
Simplify LoopBeginNode#orderedLoopEnds.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Thu, 19 Feb 2015 21:26:31 +0100 |
parents | f57d86eb036f |
children | 1cde96b96673 |
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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.*; import com.oracle.truffle.api.nodes.*; /** * <p> * Each {@link Node} has one {@link TypeSystem} at its root to define the types that can be used * throughout the system. Multiple {@link TypeSystem}s are allowed, but they cannot be mixed inside * a single {@link Node} hierarchy. A {@link TypeSystem} defines a list of types as its child * elements, in which every type precedes its super types.The latter condition ensures that the most * concrete type is found first when searching the list sequentially for the type of a given generic * value. * </p> * * <p> * Each {@link #value()} is represented as a java type. A type can specify two annotations: * {@link TypeCheck} and {@link TypeCast}. The {@link TypeCheck} checks whether a given generic * value matches to the current type. The {@link TypeCast} casts a generic type value to the current * type. If the {@link TypeCheck} and {@link TypeCast} annotations are not declared in the * {@link TypeSystem} the a default implementation is provided. The default implementation of * {@link TypeCheck} returns <code>true</code> only on an exact type match and {@link TypeCast} is * only a cast to this type. Specified methods with {@link TypeCheck} and {@link TypeCast} may be * used to extend the definition of a type in the language. In our example, the * <code>isInteger</code> and <code>asInteger</code> methods are defined in a way so that they * accept also {@link Integer} values, implicitly converting them to {@link Double} . This example * points out how we express implicit type conversions. * </p> * * <p> * <b>Example:</b> The {@link TypeSystem} contains the types {@link Boolean}, {@link Integer}, and * {@link Double}. The type {@link Object} is always used implicitly as the generic type represent * all values. * * <pre> * * {@literal @}TypeSystem(types = {boolean.class, int.class, double.class}) * public abstract class ExampleTypeSystem { * * {@literal @}TypeCheck * public boolean isInteger(Object value) { * return value instanceof Integer || value instanceof Double; * } * * {@literal @}TypeCast * public double asInteger(Object value) { * return ((Number)value).doubleValue(); * } * } * </pre> * * * @see TypeCast * @see TypeCheck */ @Retention(RetentionPolicy.CLASS) @Target({ElementType.TYPE}) public @interface TypeSystem { /** * The list of types as child elements of the {@link TypeSystem}. Each precedes its super type. */ Class<?>[] value(); }