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view graal/com.oracle.truffle.api.dsl/src/com/oracle/truffle/api/dsl/TypeSystem.java @ 16755:bd28da642eea
Truffle-DSL: Several new features implemented:
Implementation of a new code generation layout which shares code between generated nodes.
Declaration order of specializations is now used as specialization order.
Specializations do no longer perform fallthrough on respecialization, they now always respecialize from the first specialization.
Implemented support for contains relations between specializations.
Improved reachability error messages.
Preliminary support for @Implies.
author | Christian Humer <christian.humer@gmail.com> |
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date | Mon, 11 Aug 2014 15:53:05 +0200 |
parents | 288c23143d47 |
children | f57d86eb036f |
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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(); }