Mercurial > hg > graal-compiler
annotate graal/com.oracle.truffle.api.dsl/src/com/oracle/truffle/api/dsl/Fallback.java @ 18319:56cc1a799a60
(re)converted Value to an interface
author | Doug Simon <doug.simon@oracle.com> |
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date | Fri, 07 Nov 2014 22:00:11 +0100 |
parents | 7b6a4ae58de4 |
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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. Oracle designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Oracle in the LICENSE file that accompanied this code. |
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10 * |
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Truffle-DSL: API-change: Renamed truffle.api.codegen to truffle.api.dsl for all projects and packages.
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11 * This code is distributed in the hope that it will be useful, but WITHOUT |
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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Truffle-DSL: API-change: Renamed truffle.api.codegen to truffle.api.dsl for all projects and packages.
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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Truffle-DSL: API-change: Renamed truffle.api.codegen to truffle.api.dsl for all projects and packages.
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14 * version 2 for more details (a copy is included in the LICENSE file that |
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Truffle-DSL: API-change: Renamed truffle.api.codegen to truffle.api.dsl for all projects and packages.
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15 * accompanied this code). |
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Truffle-DSL: API-change: Renamed truffle.api.codegen to truffle.api.dsl for all projects and packages.
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16 * |
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Truffle-DSL: API-change: Renamed truffle.api.codegen to truffle.api.dsl for all projects and packages.
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17 * You should have received a copy of the GNU General Public License version |
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18 * 2 along with this work; if not, write to the Free Software Foundation, |
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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20 * |
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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22 * or visit www.oracle.com if you need additional information or have any |
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23 * questions. |
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24 */ |
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25 package com.oracle.truffle.api.dsl; |
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26 |
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27 import java.lang.annotation.*; |
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28 |
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29 import com.oracle.truffle.api.nodes.*; |
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30 |
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31 /** |
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32 * <p> |
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33 * A method annotated with {@link Fallback} is treated as a {@link Specialization} that implicitly |
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34 * links all the guards of all other declared {@link Specialization} annotated methods of the |
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Christian Humer <christian.humer@gmail.com>
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35 * operation in a negated form. As a consequence it cannot declare any other guards. The expected |
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36 * signature of the method must match to the signature of a {@link Specialization} with the |
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37 * additional limitation that only generically executable argument types are allowed. A generically |
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38 * executable argument is a an argument hat can be executed from the child {@link Node} using an |
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39 * execute method without {@link UnsupportedOperationException}. In many cases the generically |
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40 * executable type is {@link Object}. An operation is limited to just one {@link Fallback} |
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41 * specialization which is always ordered at the end of the specialization chain. |
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42 * </p> |
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43 * |
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44 * <p> |
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45 * A simple example showing the use of the {@link Fallback} annotation in a DSL operation: |
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46 * </p> |
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47 * |
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48 * <pre> |
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49 * @Specialization int doInt(int a) {..} |
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50 * @Specialization int doDouble(double a) {..} |
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51 * @Fallback int orElse(Object a) {..} |
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52 * </pre> |
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53 * |
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54 * <p> |
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55 * The previous example could be redeclared just using {@link Specialization} annotated methods as |
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56 * follows: |
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57 * </p> |
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58 * |
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59 * <pre> |
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60 * @Specialization int doInt(int a) {..} |
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61 * @Specialization int doDouble(double a) {..} |
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62 * @Specialization(guard={"!isInt(a)", "!isDouble(a)"}) |
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63 * int orElse(Object a) {..} |
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64 * </pre> |
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65 * |
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66 * <p> |
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67 * <b>Performance note:</b> For operations with a lot of {@link Specialization} annotated methods |
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68 * the use of {@link Fallback} might generate a guard that is very big. Try to avoid the use of |
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69 * {@link Fallback} for specializations that are significantly important for peak performance. |
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70 * </p> |
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71 * |
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72 * @see Specialization |
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73 * @see NodeChild |
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74 */ |
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75 @Retention(RetentionPolicy.CLASS) |
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76 @Target({ElementType.METHOD}) |
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77 public @interface Fallback { |
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78 |
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79 } |