Mercurial > hg > graal-compiler
annotate graal/com.oracle.truffle.sl/src/com/oracle/truffle/sl/nodes/SLTypes.java @ 18125:2a69cbe850a8
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author | Gilles Duboscq <duboscq@ssw.jku.at> |
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date | Mon, 20 Oct 2014 19:07:20 +0200 |
parents | 7392b9e0470b |
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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 * 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.sl.nodes; |
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24 |
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25 import java.math.*; |
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26 |
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27 import com.oracle.truffle.api.dsl.*; |
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28 import com.oracle.truffle.sl.*; |
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29 import com.oracle.truffle.sl.runtime.*; |
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30 |
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31 /** |
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32 * The type system of SL, as explained in {@link SLMain}. Based on the {@link TypeSystem} |
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33 * annotation, the Truffle DSL generates the subclass {@link SLTypesGen} with type test and type |
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34 * conversion methods for all types. In this class, we only cover types where the automatically |
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35 * generated ones would not be sufficient. |
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36 */ |
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37 @TypeSystem({long.class, BigInteger.class, boolean.class, String.class, SLFunction.class, SLNull.class}) |
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38 public abstract class SLTypes { |
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39 |
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40 /** |
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41 * Example of a manually specified type check that replaces the automatically generated type |
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42 * check that the Truffle DSL would generate. For {@link SLNull}, we do not need an |
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43 * {@code instanceof} check, because we know that there is only a {@link SLNull#SINGLETON |
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44 * singleton} instance. |
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45 */ |
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46 @TypeCheck |
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47 public boolean isSLNull(Object value) { |
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48 return value == SLNull.SINGLETON; |
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49 } |
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50 |
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51 /** |
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52 * Example of a manually specified type cast that replaces the automatically generated type cast |
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53 * that the Truffle DSL would generate. For {@link SLNull}, we do not need an actual cast, |
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54 * because we know that there is only a {@link SLNull#SINGLETON singleton} instance. |
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55 */ |
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56 @TypeCast |
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57 public SLNull asSLNull(Object value) { |
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58 assert isSLNull(value); |
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59 return SLNull.SINGLETON; |
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60 } |
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61 |
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62 /** |
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63 * Informs the Truffle DSL that a primitive {@code long} value can be used in all |
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64 * specializations where a {@link BigInteger} is expected. This models the semantic of SL: It |
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65 * only has an arbitrary precision Number type (implemented as {@link BigInteger}, and |
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66 * {@code long} is only used as a performance optimization to avoid the costly |
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67 * {@link BigInteger} arithmetic for values that fit into a 64-bit primitive value. |
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68 */ |
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69 @ImplicitCast |
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70 public BigInteger castBigInteger(long value) { |
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71 return BigInteger.valueOf(value); |
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72 } |
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73 } |