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annotate truffle/com.oracle.truffle.api.dsl.test/src/com/oracle/truffle/api/dsl/test/examples/StableDispatch.java @ 21951:9c8c0937da41

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Moving all sources into truffle subdirectory
author Jaroslav Tulach <jaroslav.tulach@oracle.com>
date Wed, 17 Jun 2015 10:58:08 +0200
parents graal/com.oracle.truffle.api.dsl.test/src/com/oracle/truffle/api/dsl/test/examples/StableDispatch.java@a79a3e467245
children dc83cc1f94f2
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1 /*
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2 * Copyright (c) 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.api.dsl.test.examples;
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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.api.utilities.*;
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30
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31 /**
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32 * This example is based on the SLDispatchNode of SimpleLanguage. It shows how to implement a simple
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33 * inline cache with an assumption that needs to be checked.
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34 *
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35 * Note that if an assumption is invalidated the specialization instantiation is removed.
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36 */
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37 @SuppressWarnings("unused")
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38 @NodeChildren({@NodeChild("function"), @NodeChild("arguments")})
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39 public class StableDispatch {
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40
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41 public static class StableDispatchNode extends ExampleNode {
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42
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43 @Specialization(guards = "function == cachedFunction", assumptions = "cachedFunction.getCallTargetStable()")
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44 protected static Object directDispatch(VirtualFrame frame, SLFunction function, Object[] arguments, //
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45 @Cached("function") SLFunction cachedFunction, //
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46 @Cached("create(cachedFunction.getCallTarget())") DirectCallNode callNode) {
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47 return callNode.call(frame, arguments);
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48 }
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49
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50 @Specialization(contains = "directDispatch")
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51 protected static Object indirectDispatch(VirtualFrame frame, SLFunction function, Object[] arguments, //
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52 @Cached("create()") IndirectCallNode callNode) {
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53 return callNode.call(frame, function.getCallTarget(), arguments);
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54 }
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55 }
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56
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57 public static final class SLFunction {
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58
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59 private CallTarget callTarget;
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60 private final CyclicAssumption callTargetStable;
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61
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62 protected SLFunction(String name) {
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63 this.callTargetStable = new CyclicAssumption(name);
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64 }
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65
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66 protected void setCallTarget(CallTarget callTarget) {
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67 this.callTarget = callTarget;
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68 this.callTargetStable.invalidate();
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69 }
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70
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71 public CallTarget getCallTarget() {
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72 return callTarget;
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73 }
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74
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75 public Assumption getCallTargetStable() {
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76 return callTargetStable.getAssumption();
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77 }
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78 }
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79
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80 }