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annotate graal/com.oracle.truffle.api.codegen/src/com/oracle/truffle/api/codegen/TypeSystem.java @ 7530:5e3d1a68664e

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applied mx eclipseformat to all Java files
author Doug Simon <doug.simon@oracle.com>
date Wed, 23 Jan 2013 16:34:57 +0100
parents 2232848be438
children 33e08aca06ff
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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
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27 /**
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28 * <p>
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29 * Annotates a type system class that represents type information for a node. Generates code for
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30 * converting and managing types. Methods contained in the type system may be annotated with
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31 * {@link TypeCast}, {@link TypeCheck} or {@link GuardCheck}. These methods alter the default
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32 * behavior of the type system.
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33 * </p>
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34 *
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35 *
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36 * <b>Example:</b>
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37 * <p>
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38 * Shows a <code>@TypeSystem</code> definition with three types. In this example BigIntegers can be
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39 * also treated as integers if their bit width is less than 32.
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40 * </p>
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41 *
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42 * <pre>
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43 *
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44 * {@literal @}TypeSystem(types = {int.class, BigInteger.class, String.class}, nodeBaseClass = TypedNode.class)
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45 * public abstract class Types {
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46 *
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47 * {@literal @}TypeCheck
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48 * public boolean isInteger(Object value) {
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49 * return value instanceof Integer || (value instanceof BigInteger &amp;&amp; ((BigInteger) value).bitLength() &lt; Integer.SIZE);
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50 * }
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51 *
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52 * {@literal @}TypeCast
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53 * public int asInteger(Object value) {
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54 * if (value instanceof Integer) {
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55 * return (int) value;
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56 * } else {
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57 * return ((BigInteger) value).intValue();
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58 * }
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59 * }
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60 * }
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61 * </pre>
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62 *
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63 * @see TypeCast
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64 * @see TypeCheck
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65 * @see GuardCheck
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66 */
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67 @Retention(RetentionPolicy.CLASS)
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68 @Target({ElementType.TYPE})
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69 public @interface TypeSystem {
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70
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71 /**
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72 * Sets the types contained by this type system. The order of types also determines the order of
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73 * specialization.
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74 */
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75 Class[] value();
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76
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77 }