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