Mercurial > hg > truffle
comparison truffle/com.oracle.truffle.api/src/com/oracle/truffle/api/nodes/NodeCost.java @ 21951:9c8c0937da41
Moving all sources into truffle subdirectory
author | Jaroslav Tulach <jaroslav.tulach@oracle.com> |
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date | Wed, 17 Jun 2015 10:58:08 +0200 |
parents | graal/com.oracle.truffle.api/src/com/oracle/truffle/api/nodes/NodeCost.java@5787218bad91 |
children | dc83cc1f94f2 |
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21950:2a5011c7e641 | 21951:9c8c0937da41 |
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1 /* | |
2 * Copyright (c) 2012, 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. Oracle designates this | |
8 * particular file as subject to the "Classpath" exception as provided | |
9 * by Oracle in the LICENSE file that accompanied this code. | |
10 * | |
11 * This code is distributed in the hope that it will be useful, but WITHOUT | |
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
14 * version 2 for more details (a copy is included in the LICENSE file that | |
15 * accompanied this code). | |
16 * | |
17 * You should have received a copy of the GNU General Public License version | |
18 * 2 along with this work; if not, write to the Free Software Foundation, | |
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
20 * | |
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
22 * or visit www.oracle.com if you need additional information or have any | |
23 * questions. | |
24 */ | |
25 package com.oracle.truffle.api.nodes; | |
26 | |
27 import com.oracle.truffle.api.*; | |
28 | |
29 /** | |
30 * Represents a rough estimate for the cost of a {@link Node}. This estimate can be used by runtime | |
31 * systems or guest languages to implement heuristics based on Truffle ASTs. | |
32 * | |
33 * @see Node#getCost() | |
34 */ | |
35 public enum NodeCost { | |
36 | |
37 /** | |
38 * This node has literally no costs and should be ignored for heuristics. This is particularly | |
39 * useful for wrapper and profiling nodes which should not influence the heuristics. | |
40 */ | |
41 NONE, | |
42 | |
43 /** | |
44 * This node has a {@link CompilerDirectives#transferToInterpreter()} or | |
45 * {@link CompilerDirectives#transferToInterpreterAndInvalidate()} as its first unconditional | |
46 * statement. | |
47 */ | |
48 UNINITIALIZED, | |
49 | |
50 /** | |
51 * This node represents a specialized monomorphic version of an operation. | |
52 */ | |
53 MONOMORPHIC, | |
54 | |
55 /** | |
56 * This node represents a polymorphic version of an operation. For multiple chained polymorphic | |
57 * nodes the first may return {@link #MONOMORPHIC} and all additional nodes should return | |
58 * {@link #POLYMORPHIC}. | |
59 */ | |
60 POLYMORPHIC, | |
61 | |
62 /** | |
63 * This node represents a megamorphic version of an operation. This value should only be used if | |
64 * the operation implementation supports monomorphism and polymorphism otherwise | |
65 * {@link #MONOMORPHIC} should be used instead. | |
66 */ | |
67 MEGAMORPHIC; | |
68 | |
69 public boolean isTrivial() { | |
70 return this == NONE || this == UNINITIALIZED; | |
71 } | |
72 | |
73 } |