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annotate truffle/com.oracle.truffle.sl/src/com/oracle/truffle/sl/nodes/call/SLDispatchNode.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
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1 /*
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2 * Copyright (c) 2012, 2015, 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.call;
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42
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43 import com.oracle.truffle.api.CallTarget;
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44 import com.oracle.truffle.api.dsl.Cached;
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45 import com.oracle.truffle.api.dsl.Specialization;
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46 import com.oracle.truffle.api.frame.VirtualFrame;
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47 import com.oracle.truffle.api.nodes.DirectCallNode;
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48 import com.oracle.truffle.api.nodes.IndirectCallNode;
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49 import com.oracle.truffle.api.nodes.Node;
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50 import com.oracle.truffle.sl.runtime.SLFunction;
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51
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52 public abstract class SLDispatchNode extends Node {
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53
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54 protected static final int INLINE_CACHE_SIZE = 2;
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55
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56 public abstract Object executeDispatch(VirtualFrame frame, SLFunction function, Object[] arguments);
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57
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58 @Specialization(guards = "function.getCallTarget() == null")
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59 protected Object doUndefinedFunction(SLFunction function, @SuppressWarnings("unused") Object[] arguments) {
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60 throw new SLUndefinedFunctionException(function.getName());
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61 }
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62
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63 /**
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64 * Inline cached specialization of the dispatch.
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65 *
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66 * <p>
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67 * Since SL is a quite simple language, the benefit of the inline cache is quite small: after
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68 * checking that the actual function to be executed is the same as the cachedFuntion, we can
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69 * safely execute the cached call target. You can reasonably argue that caching the call target
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70 * is overkill, since we could just retrieve it via {@code function.getCallTarget()}. However,
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71 * in a more complex language the lookup of the call target is usually much more complicated
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72 * than in SL. In addition, caching the call target allows method inlining.
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73 * </p>
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74 *
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75 * <p>
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76 * {@code limit = "INLINE_CACHE_SIZE"} Specifies the limit number of inline cache specialization
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77 * instantiations.
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78 * </p>
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79 * <p>
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80 * {@code guards = "function == cachedFunction"} The inline cache check. Note that
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81 * cachedFunction is a final field so that the compiler can optimize the check.
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82 * </p>
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83 * <p>
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84 * {@code assumptions = "cachedFunction.getCallTargetStable()"} Support for function
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85 * redefinition: When a function is redefined, the call target maintained by the SLFunction
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86 * object is change. To avoid a check for that, we use an Assumption that is invalidated by the
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87 * SLFunction when the change is performed. Since checking an assumption is a no-op in compiled
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88 * code, the assumption check performed by the DSL does not add any overhead during optimized
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89 * execution.
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90 * </p>
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91 *
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92 * @see Cached
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93 * @see Specialization
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94 *
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95 * @param function the dynamically provided function
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96 * @param cachedFunction the cached function of the specialization instance
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97 * @param callNode the {@link DirectCallNode} specifically created for the {@link CallTarget} in
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98 * cachedFunction.
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99 */
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100 @Specialization(limit = "INLINE_CACHE_SIZE", guards = "function == cachedFunction", assumptions = "cachedFunction.getCallTargetStable()")
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101 protected static Object doDirect(VirtualFrame frame, SLFunction function, Object[] arguments, //
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102 @Cached("function") SLFunction cachedFunction, //
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103 @Cached("create(cachedFunction.getCallTarget())") DirectCallNode callNode) {
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104 /* Inline cache hit, we are safe to execute the cached call target. */
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105 return callNode.call(frame, arguments);
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106 }
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107
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108 /**
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109 * Slow-path code for a call, used when the polymorphic inline cache exceeded its maximum size
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110 * specified in <code>INLINE_CACHE_SIZE</code>. Such calls are not optimized any further, e.g.,
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111 * no method inlining is performed.
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112 */
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113 @Specialization(contains = "doDirect")
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114 protected static Object doIndirect(VirtualFrame frame, SLFunction function, Object[] arguments, //
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115 @Cached("create()") IndirectCallNode callNode) {
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116 /*
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117 * SL has a quite simple call lookup: just ask the function for the current call target, and
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118 * call it.
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119 */
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120 return callNode.call(frame, function.getCallTarget(), arguments);
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121 }
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122
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123 }