Mercurial > hg > graal-compiler
annotate graal/com.oracle.truffle.api.codegen/src/com/oracle/truffle/api/codegen/TypeSystem.java @ 9189:0331f7512be2
CPU capability detection.
author | Roland Schatz <roland.schatz@oracle.com> |
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date | Thu, 18 Apr 2013 16:25:08 +0200 |
parents | 33e08aca06ff |
children | 8b2573c8d47f |
rev | line source |
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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} or {@link TypeCheck}. These methods alter the default behavior of the type |
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32 * 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 && ((BigInteger) value).bitLength() < 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 */ |
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66 @Retention(RetentionPolicy.CLASS) |
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67 @Target({ElementType.TYPE}) |
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68 public @interface TypeSystem { |
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69 |
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70 /** |
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71 * Sets the types contained by this type system. The order of types also determines the order of |
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72 * specialization. |
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73 */ |
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74 Class[] value(); |
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75 |
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76 } |