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annotate graal/com.oracle.truffle.api.dsl/src/com/oracle/truffle/api/dsl/TypeSystem.java @ 10597:79041ab43660

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Truffle-DSL: API-change: Renamed truffle.api.codegen to truffle.api.dsl for all projects and packages.
author Christian Humer <christian.humer@gmail.com>
date Mon, 01 Jul 2013 20:58:32 +0200
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children 494b818b527c
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10597
79041ab43660 Truffle-DSL: API-change: Renamed truffle.api.codegen to truffle.api.dsl for all projects and packages.
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1 /*
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2 * Copyright (c) 2012, 2012, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
79041ab43660 Truffle-DSL: API-change: Renamed truffle.api.codegen to truffle.api.dsl for all projects and packages.
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
79041ab43660 Truffle-DSL: API-change: Renamed truffle.api.codegen to truffle.api.dsl for all projects and packages.
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
79041ab43660 Truffle-DSL: API-change: Renamed truffle.api.codegen to truffle.api.dsl for all projects and packages.
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
79041ab43660 Truffle-DSL: API-change: Renamed truffle.api.codegen to truffle.api.dsl for all projects and packages.
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16 * 2 along with this work; if not, write to the Free Software Foundation,
79041ab43660 Truffle-DSL: API-change: Renamed truffle.api.codegen to truffle.api.dsl for all projects and packages.
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
79041ab43660 Truffle-DSL: API-change: Renamed truffle.api.codegen to truffle.api.dsl for all projects and packages.
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21 * questions.
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22 */
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23 package com.oracle.truffle.api.dsl;
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24
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25 import java.lang.annotation.*;
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26
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27 import com.oracle.truffle.api.nodes.*;
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28
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29 /**
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30 * <p>
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31 * Each {@link Node} has one {@link TypeSystem} at its root to define the types that can be used
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32 * throughout the system. Multiple {@link TypeSystem}s are allowed, but they cannot be mixed inside
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33 * a single {@link Node} hierarchy. A {@link TypeSystem} defines a list of types as its child
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34 * elements, in which every type precedes its super types.The latter condition ensures that the most
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35 * concrete type is found first when searching the list sequentially for the type of a given generic
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36 * value.
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37 * </p>
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38 *
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39 * <p>
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40 * Each {@link #value()} is represented as a java type. A type can specify two annotations:
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41 * {@link TypeCheck} and {@link TypeCast}. The {@link TypeCheck} checks whether a given generic
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42 * value matches to the current type. The {@link TypeCast} casts a generic type value to the current
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43 * type. If the {@link TypeCheck} and {@link TypeCast} annotations are not declared in the
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44 * {@link TypeSystem} the a default implementation is provided. The default implementation of
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45 * {@link TypeCheck} returns <code>true</code> only on an exact type match and {@link TypeCast} is
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46 * only a cast to this type. Specified methods with {@link TypeCheck} and {@link TypeCast} may be
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47 * used to extend the definition of a type in the language. In our example, the
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48 * <code>isInteger</code> and <code>asInteger</code> methods are defined in a way so that they
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49 * accept also {@link Integer} values, implicitly converting them to {@link Double} . This example
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50 * points out how we express implicit type conversions.
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51 * </p>
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52 *
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53 * <p>
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54 * <b>Example:</b> The {@link TypeSystem} contains the types {@link Boolean}, {@link Integer}, and
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55 * {@link Double}. The type {@link Object} is always used implicitly as the generic type represent
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56 * all values.
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57 *
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58 * <pre>
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59 *
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60 * {@literal @}TypeSystem(types = {boolean.class, int.class, double.class})
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61 * public abstract class ExampleTypeSystem {
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62 *
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63 * {@literal @}TypeCheck
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64 * public boolean isInteger(Object value) {
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65 * return value instanceof Integer || value instanceof Double;
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66 * }
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67 *
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68 * {@literal @}TypeCast
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69 * public double asInteger(Object value) {
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70 * return ((Number)value).doubleValue();
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71 * }
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72 * }
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73 * </pre>
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74 *
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75 * </p>
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76 *
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77 * @see TypeCast
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78 * @see TypeCheck
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79 */
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80 @Retention(RetentionPolicy.CLASS)
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81 @Target({ElementType.TYPE})
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82 public @interface TypeSystem {
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83
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84 /**
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85 * The list of types as child elements of the {@link TypeSystem}. Each precedes its super type.
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86 */
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87 Class[] value();
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88
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89 }