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comparison 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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21950:2a5011c7e641 21951:9c8c0937da41
1 /*
2 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23 package com.oracle.truffle.api.dsl.test.examples;
24
25 import com.oracle.truffle.api.*;
26 import com.oracle.truffle.api.dsl.*;
27 import com.oracle.truffle.api.frame.*;
28 import com.oracle.truffle.api.nodes.*;
29 import com.oracle.truffle.api.utilities.*;
30
31 /**
32 * This example is based on the SLDispatchNode of SimpleLanguage. It shows how to implement a simple
33 * inline cache with an assumption that needs to be checked.
34 *
35 * Note that if an assumption is invalidated the specialization instantiation is removed.
36 */
37 @SuppressWarnings("unused")
38 @NodeChildren({@NodeChild("function"), @NodeChild("arguments")})
39 public class StableDispatch {
40
41 public static class StableDispatchNode extends ExampleNode {
42
43 @Specialization(guards = "function == cachedFunction", assumptions = "cachedFunction.getCallTargetStable()")
44 protected static Object directDispatch(VirtualFrame frame, SLFunction function, Object[] arguments, //
45 @Cached("function") SLFunction cachedFunction, //
46 @Cached("create(cachedFunction.getCallTarget())") DirectCallNode callNode) {
47 return callNode.call(frame, arguments);
48 }
49
50 @Specialization(contains = "directDispatch")
51 protected static Object indirectDispatch(VirtualFrame frame, SLFunction function, Object[] arguments, //
52 @Cached("create()") IndirectCallNode callNode) {
53 return callNode.call(frame, function.getCallTarget(), arguments);
54 }
55 }
56
57 public static final class SLFunction {
58
59 private CallTarget callTarget;
60 private final CyclicAssumption callTargetStable;
61
62 protected SLFunction(String name) {
63 this.callTargetStable = new CyclicAssumption(name);
64 }
65
66 protected void setCallTarget(CallTarget callTarget) {
67 this.callTarget = callTarget;
68 this.callTargetStable.invalidate();
69 }
70
71 public CallTarget getCallTarget() {
72 return callTarget;
73 }
74
75 public Assumption getCallTargetStable() {
76 return callTargetStable.getAssumption();
77 }
78 }
79
80 }