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annotate graal/com.oracle.truffle.sl/src/com/oracle/truffle/sl/nodes/call/SLDispatchNode.java @ 20956:2170de9acab0

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SL: use DSL for call dispatches.
author Christian Humer <christian.humer@gmail.com>
date Tue, 14 Apr 2015 15:16:14 +0200
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20956
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1 /*
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2 * Copyright (c) 2013, 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 * 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.call;
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24
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25 import com.oracle.truffle.api.*;
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26 import com.oracle.truffle.api.dsl.*;
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27 import com.oracle.truffle.api.frame.*;
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28 import com.oracle.truffle.api.nodes.*;
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29 import com.oracle.truffle.sl.runtime.*;
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30
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31 public abstract class SLDispatchNode extends Node {
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32
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33 protected static final int INLINE_CACHE_SIZE = 2;
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34
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35 public abstract Object executeDispatch(VirtualFrame frame, SLFunction function, Object[] arguments);
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36
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37 /**
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38 * Inline cached specialization of the dispatch.
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39 *
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40 * <p>
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41 * Since SL is a quite simple language, the benefit of the inline cache is quite small: after
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42 * checking that the actual function to be executed is the same as the cachedFuntion, we can
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43 * safely execute the cached call target. You can reasonably argue that caching the call target
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44 * is overkill, since we could just retrieve it via {@code function.getCallTarget()}. However,
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45 * in a more complex language the lookup of the call target is usually much more complicated
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46 * than in SL. In addition, caching the call target allows method inlining.
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47 * </p>
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48 *
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49 * <p>
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50 * {@code limit = "INLINE_CACHE_SIZE"} Specifies the limit number of inline cache specialization
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51 * instantiations.
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52 * </p>
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53 * <p>
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54 * {@code guards = "function == cachedFunction"} The inline cache check. Note that
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55 * cachedFunction is a final field so that the compiler can optimize the check.
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56 * </p>
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57 * <p>
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58 * {@code assumptions = "cachedFunction.getCallTargetStable()"} Support for function
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59 * redefinition: When a function is redefined, the call target maintained by the SLFunction
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60 * object is change. To avoid a check for that, we use an Assumption that is invalidated by the
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61 * SLFunction when the change is performed. Since checking an assumption is a no-op in compiled
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62 * code, the assumption check performed by the DSL does not add any overhead during optimized
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63 * execution.
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64 * </p>
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65 *
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66 * @see Cached
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67 * @see Specialization
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68 *
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69 * @param function the dynamically provided function
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70 * @param cachedFunction the cached function of the specialization instance
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71 * @param callNode the {@link DirectCallNode} specifically created for the {@link CallTarget} in
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72 * cachedFunction.
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73 */
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74 @Specialization(limit = "INLINE_CACHE_SIZE", guards = "function == cachedFunction", assumptions = "cachedFunction.getCallTargetStable()")
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75 protected static Object doDirect(VirtualFrame frame, SLFunction function, Object[] arguments, //
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76 @Cached("function") SLFunction cachedFunction, //
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77 @Cached("create(cachedFunction.getCallTarget())") DirectCallNode callNode) {
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78 /* Inline cache hit, we are safe to execute the cached call target. */
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79 return callNode.call(frame, arguments);
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80 }
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81
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82 /**
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83 * Slow-path code for a call, used when the polymorphic inline cache exceeded its maximum size
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84 * specified in <code>INLINE_CACHE_SIZE</code>. Such calls are not optimized any further, e.g.,
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85 * no method inlining is performed.
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86 */
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87 @Specialization(contains = "doDirect")
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88 protected static Object doIndirect(VirtualFrame frame, SLFunction function, Object[] arguments, //
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89 @Cached("create()") IndirectCallNode callNode) {
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90 /*
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91 * SL has a quite simple call lookup: just ask the function for the current call target, and
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92 * call it.
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93 */
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94 return callNode.call(frame, function.getCallTarget(), arguments);
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95 }
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96
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97 }