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annotate graal/com.oracle.truffle.api.codegen/src/com/oracle/truffle/api/codegen/TypeSystem.java @ 10443:8b2573c8d47f
dsl cleanup.
author | Christian Humer <christian.humer@gmail.com> |
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date | Tue, 18 Jun 2013 10:10:54 +0200 |
parents | 33e08aca06ff |
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rev | line source |
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Truffle API to specify type-specalized Node classes; annotation processor for automatic code generation of the type-specialized Node classes during the build process
Christian Humer <christian.humer@gmail.com>
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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 |
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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 |
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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 |
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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 |
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16 * 2 along with this work; if not, write to the Free Software Foundation, |
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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 |
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21 * questions. |
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22 */ |
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23 package com.oracle.truffle.api.codegen; |
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24 |
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25 import java.lang.annotation.*; |
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26 |
10443 | 27 import com.oracle.truffle.api.nodes.*; |
28 | |
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29 /** |
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30 * <p> |
10443 | 31 * Each {@link Node} has one {@link TypeSystem} at its root to define the types that can be used |
32 * throughout the system. Multiple {@link TypeSystem}s are allowed, but they cannot be mixed inside | |
33 * a single {@link Node} hierarchy. A {@link TypeSystem} defines a list of types as its child | |
34 * elements, in which every type precedes its super types.The latter condition ensures that the most | |
35 * concrete type is found first when searching the list sequentially for the type of a given generic | |
36 * value. | |
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37 * </p> |
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38 * |
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39 * <p> |
10443 | 40 * Each {@link #value()} is represented as a java type. A type can specify two annotations: |
41 * {@link TypeCheck} and {@link TypeCast}. The {@link TypeCheck} checks whether a given generic | |
42 * value matches to the current type. The {@link TypeCast} casts a generic type value to the current | |
43 * type. If the {@link TypeCheck} and {@link TypeCast} annotations are not declared in the | |
44 * {@link TypeSystem} the a default implementation is provided. The default implementation of | |
45 * {@link TypeCheck} returns <code>true</code> only on an exact type match and {@link TypeCast} is | |
46 * only a cast to this type. Specified methods with {@link TypeCheck} and {@link TypeCast} may be | |
47 * used to extend the definition of a type in the language. In our example, the | |
48 * <code>isInteger</code> and <code>asInteger</code> methods are defined in a way so that they | |
49 * accept also {@link Integer} values, implicitly converting them to {@link Double} . This example | |
50 * points out how we express implicit type conversions. | |
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51 * </p> |
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52 * |
10443 | 53 * <p> |
54 * <b>Example:</b> The {@link TypeSystem} contains the types {@link Boolean}, {@link Integer}, and | |
55 * {@link Double}. The type {@link Object} is always used implicitly as the generic type represent | |
56 * all values. | |
57 * | |
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58 * <pre> |
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59 * |
10443 | 60 * {@literal @}TypeSystem(types = {boolean.class, int.class, double.class}) |
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) { |
10443 | 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 |
10443 | 69 * public double asInteger(Object value) { |
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 * |
10443 | 75 * </p> |
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 /** |
10443 | 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 } |