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annotate truffle/com.oracle.truffle.sl/src/com/oracle/truffle/sl/runtime/SLFunction.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 31eb066d75ac
children
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1 /*
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2 * Copyright (c) 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.runtime;
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42
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43 import com.oracle.truffle.api.Assumption;
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44 import com.oracle.truffle.api.RootCallTarget;
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45 import com.oracle.truffle.api.interop.ForeignAccess;
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46 import com.oracle.truffle.api.interop.TruffleObject;
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47 import com.oracle.truffle.api.utilities.CyclicAssumption;
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48
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49 /**
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50 * Represents a SL function. On the Truffle level, a callable element is represented by a
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51 * {@link RootCallTarget call target}. This class encapsulates a call target, and adds version
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52 * support: functions in SL can be redefined, i.e. changed at run time. When a function is
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53 * redefined, the call target managed by this function object is changed (and {@link #callTarget} is
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54 * therefore not a final field).
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55 * <p>
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56 * Function redefinition is expected to be rare, therefore optimized call nodes want to speculate
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57 * that the call target is stable. This is possible with the help of a Truffle {@link Assumption}: a
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58 * call node can keep the call target returned by {@link #getCallTarget()} cached until the
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59 * assumption returned by {@link #getCallTargetStable()} is valid.
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60 * <p>
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61 * The {@link #callTarget} can be {@code null}. To ensure that only one {@link SLFunction} instance
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62 * per name exists, the {@link SLFunctionRegistry} creates an instance also when performing name
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63 * lookup. A function that has been looked up, i.e., used, but not defined, has no call target.
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64 */
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65 public final class SLFunction implements TruffleObject {
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66
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67 /** The name of the function. */
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68 private final String name;
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69
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70 /** The current implementation of this function. */
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71 private RootCallTarget callTarget;
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72
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73 /**
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74 * Manages the assumption that the {@link #callTarget} is stable. We use the utility class
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75 * {@link CyclicAssumption}, which automatically creates a new {@link Assumption} when the old
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76 * one gets invalidated.
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77 */
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78 private final CyclicAssumption callTargetStable;
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79
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80 protected SLFunction(String name) {
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81 this.name = name;
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82 this.callTargetStable = new CyclicAssumption(name);
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83 }
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84
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85 public String getName() {
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86 return name;
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87 }
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88
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89 protected void setCallTarget(RootCallTarget callTarget) {
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90 this.callTarget = callTarget;
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91 /*
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92 * We have a new call target. Invalidate all code that speculated that the old call target
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93 * was stable.
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94 */
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95 callTargetStable.invalidate();
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96 }
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97
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98 public RootCallTarget getCallTarget() {
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99 return callTarget;
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100 }
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101
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102 public Assumption getCallTargetStable() {
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103 return callTargetStable.getAssumption();
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104 }
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105
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106 /**
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107 * This method is, e.g., called when using a function literal in a string concatenation. So
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108 * changing it has an effect on SL programs.
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109 */
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110 @Override
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111 public String toString() {
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112 return name;
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113 }
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114
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115 /**
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116 * In case you want some of your objects to co-operate with other languages, you need to make
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117 * them implement {@link TruffleObject} and provide additional {@link SLFunctionForeignAccess
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118 * foreign access implementation}.
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119 */
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120 @Override
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121 public ForeignAccess getForeignAccess() {
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122 return SLFunctionForeignAccess.create();
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123 }
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124 }