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annotate truffle/com.oracle.truffle.sl/src/com/oracle/truffle/sl/nodes/SLTypes.java @ 22157:dc83cc1f94f2

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Using fully qualified imports
author Jaroslav Tulach <jaroslav.tulach@oracle.com>
date Wed, 16 Sep 2015 11:33:22 +0200
parents 503529c65456
children 414e82b9fc35
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1 /*
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2 * Copyright (c) 2012, 2014, 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 * The Universal Permissive License (UPL), Version 1.0
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6 *
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7 * Subject to the condition set forth below, permission is hereby granted to any
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8 * person obtaining a copy of this software, associated documentation and/or
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9 * data (collectively the "Software"), free of charge and under any and all
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10 * copyright rights in the Software, and any and all patent rights owned or
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11 * freely licensable by each licensor hereunder covering either (i) the
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12 * unmodified Software as contributed to or provided by such licensor, or (ii)
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13 * the Larger Works (as defined below), to deal in both
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14 *
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15 * (a) the Software, and
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16 *
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17 * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
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18 * one is included with the Software each a "Larger Work" to which the Software
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19 * is contributed by such licensors),
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20 *
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21 * without restriction, including without limitation the rights to copy, create
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22 * derivative works of, display, perform, and distribute the Software and make,
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23 * use, sell, offer for sale, import, export, have made, and have sold the
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24 * Software and the Larger Work(s), and to sublicense the foregoing rights on
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25 * either these or other terms.
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26 *
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27 * This license is subject to the following condition:
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28 *
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29 * The above copyright notice and either this complete permission notice or at a
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30 * minimum a reference to the UPL must be included in all copies or substantial
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31 * portions of the Software.
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32 *
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33 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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34 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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35 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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36 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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37 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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38 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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39 * SOFTWARE.
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40 */
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41 package com.oracle.truffle.sl.nodes;
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42
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43 import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary;
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44 import com.oracle.truffle.api.dsl.ImplicitCast;
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45 import com.oracle.truffle.api.dsl.TypeCast;
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46 import com.oracle.truffle.api.dsl.TypeCheck;
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47 import com.oracle.truffle.api.dsl.TypeSystem;
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48 import com.oracle.truffle.api.dsl.internal.DSLOptions;
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49 import com.oracle.truffle.sl.SLLanguage;
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50 import com.oracle.truffle.sl.runtime.SLFunction;
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51 import com.oracle.truffle.sl.runtime.SLNull;
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52 import java.math.BigInteger;
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53
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54 /**
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55 * The type system of SL, as explained in {@link SLLanguage}. Based on the {@link TypeSystem}
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56 * annotation, the Truffle DSL generates the subclass {@link SLTypesGen} with type test and type
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57 * conversion methods for all types. In this class, we only cover types where the automatically
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58 * generated ones would not be sufficient.
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59 */
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60 @TypeSystem({long.class, BigInteger.class, boolean.class, String.class, SLFunction.class, SLNull.class})
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61 @DSLOptions(useNewLayout = true)
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62 public abstract class SLTypes {
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63
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64 /**
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65 * Example of a manually specified type check that replaces the automatically generated type
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66 * check that the Truffle DSL would generate. For {@link SLNull}, we do not need an
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67 * {@code instanceof} check, because we know that there is only a {@link SLNull#SINGLETON
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68 * singleton} instance.
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69 */
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70 @TypeCheck(SLNull.class)
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71 public static boolean isSLNull(Object value) {
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72 return value == SLNull.SINGLETON;
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73 }
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74
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75 /**
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76 * Example of a manually specified type cast that replaces the automatically generated type cast
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77 * that the Truffle DSL would generate. For {@link SLNull}, we do not need an actual cast,
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78 * because we know that there is only a {@link SLNull#SINGLETON singleton} instance.
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79 */
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80 @TypeCast(SLNull.class)
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81 public static SLNull asSLNull(Object value) {
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82 assert isSLNull(value);
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83 return SLNull.SINGLETON;
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84 }
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85
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86 /**
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87 * Informs the Truffle DSL that a primitive {@code long} value can be used in all
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88 * specializations where a {@link BigInteger} is expected. This models the semantic of SL: It
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89 * only has an arbitrary precision Number type (implemented as {@link BigInteger}, and
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90 * {@code long} is only used as a performance optimization to avoid the costly
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91 * {@link BigInteger} arithmetic for values that fit into a 64-bit primitive value.
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92 */
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93 @ImplicitCast
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94 @TruffleBoundary
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95 public static BigInteger castBigInteger(long value) {
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96 return BigInteger.valueOf(value);
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97 }
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98 }