Mercurial > hg > graal-jvmci-8
comparison graal/com.oracle.jvmci.meta/src/com/oracle/jvmci/meta/JavaTypeProfile.java @ 21556:48c1ebd24120
renamed com.oracle.graal.api[meta|code] modules to com.oracle.jvmci.[meta|code] (JBS:GRAAL-53)
author | Doug Simon <doug.simon@oracle.com> |
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date | Wed, 27 May 2015 00:36:16 +0200 |
parents | graal/com.oracle.graal.api.meta/src/com/oracle/graal/api/meta/JavaTypeProfile.java@082417ac43e4 |
children | 31fc2fce38f3 |
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1 /* | |
2 * Copyright (c) 2011, 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. | |
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.jvmci.meta; | |
24 | |
25 import java.util.*; | |
26 | |
27 import com.oracle.jvmci.meta.JavaTypeProfile.ProfiledType; | |
28 | |
29 /** | |
30 * This profile object represents the type profile at a specific BCI. The precision of the supplied | |
31 * values may vary, but a runtime that provides this information should be aware that it will be | |
32 * used to guide performance-critical decisions like speculative inlining, etc. | |
33 */ | |
34 public final class JavaTypeProfile extends AbstractJavaProfile<ProfiledType, ResolvedJavaType> { | |
35 | |
36 private static final ProfiledType[] EMPTY_ARRAY = new ProfiledType[0]; | |
37 | |
38 private final TriState nullSeen; | |
39 | |
40 public JavaTypeProfile(TriState nullSeen, double notRecordedProbability, ProfiledType[] pitems) { | |
41 super(notRecordedProbability, pitems); | |
42 this.nullSeen = nullSeen; | |
43 } | |
44 | |
45 /** | |
46 * Returns whether a null value was at the type check. | |
47 */ | |
48 public TriState getNullSeen() { | |
49 return nullSeen; | |
50 } | |
51 | |
52 /** | |
53 * A list of types for which the runtime has recorded probability information. Note that this | |
54 * includes both positive and negative types where a positive type is a subtype of the checked | |
55 * type and a negative type is not. | |
56 */ | |
57 public ProfiledType[] getTypes() { | |
58 return getItems(); | |
59 } | |
60 | |
61 public JavaTypeProfile restrict(JavaTypeProfile otherProfile) { | |
62 if (otherProfile.getNotRecordedProbability() > 0.0) { | |
63 // Not useful for restricting since there is an unknown set of types occurring. | |
64 return this; | |
65 } | |
66 | |
67 if (this.getNotRecordedProbability() > 0.0) { | |
68 // We are unrestricted, so the other profile is always a better estimate. | |
69 return otherProfile; | |
70 } | |
71 | |
72 ArrayList<ProfiledType> result = new ArrayList<>(); | |
73 for (int i = 0; i < getItems().length; i++) { | |
74 ProfiledType ptype = getItems()[i]; | |
75 ResolvedJavaType type = ptype.getItem(); | |
76 if (otherProfile.isIncluded(type)) { | |
77 result.add(ptype); | |
78 } | |
79 } | |
80 | |
81 TriState newNullSeen = (otherProfile.getNullSeen() == TriState.FALSE) ? TriState.FALSE : getNullSeen(); | |
82 double newNotRecorded = getNotRecordedProbability(); | |
83 return createAdjustedProfile(result, newNullSeen, newNotRecorded); | |
84 } | |
85 | |
86 public JavaTypeProfile restrict(ResolvedJavaType declaredType, boolean nonNull) { | |
87 ArrayList<ProfiledType> result = new ArrayList<>(); | |
88 for (int i = 0; i < getItems().length; i++) { | |
89 ProfiledType ptype = getItems()[i]; | |
90 ResolvedJavaType type = ptype.getItem(); | |
91 if (declaredType.isAssignableFrom(type)) { | |
92 result.add(ptype); | |
93 } | |
94 } | |
95 | |
96 TriState newNullSeen = (nonNull) ? TriState.FALSE : getNullSeen(); | |
97 double newNotRecorded = this.getNotRecordedProbability(); | |
98 // Assume for the types not recorded, the incompatibility rate is the same. | |
99 if (getItems().length != 0) { | |
100 newNotRecorded *= ((double) result.size() / (double) getItems().length); | |
101 } | |
102 return createAdjustedProfile(result, newNullSeen, newNotRecorded); | |
103 } | |
104 | |
105 private JavaTypeProfile createAdjustedProfile(ArrayList<ProfiledType> result, TriState newNullSeen, double newNotRecorded) { | |
106 if (result.size() != this.getItems().length || newNotRecorded != getNotRecordedProbability() || newNullSeen != getNullSeen()) { | |
107 if (result.size() == 0) { | |
108 return new JavaTypeProfile(newNullSeen, 1.0, EMPTY_ARRAY); | |
109 } | |
110 double factor; | |
111 if (result.size() == this.getItems().length) { | |
112 /* List of types did not change, no need to recompute probabilities. */ | |
113 factor = 1.0; | |
114 } else { | |
115 double probabilitySum = 0.0; | |
116 for (int i = 0; i < result.size(); i++) { | |
117 probabilitySum += result.get(i).getProbability(); | |
118 } | |
119 probabilitySum += newNotRecorded; | |
120 | |
121 factor = 1.0 / probabilitySum; // Normalize to 1.0 | |
122 assert factor >= 1.0; | |
123 } | |
124 ProfiledType[] newResult = new ProfiledType[result.size()]; | |
125 for (int i = 0; i < newResult.length; ++i) { | |
126 ProfiledType curType = result.get(i); | |
127 newResult[i] = new ProfiledType(curType.getItem(), Math.min(1.0, curType.getProbability() * factor)); | |
128 } | |
129 double newNotRecordedTypeProbability = Math.min(1.0, newNotRecorded * factor); | |
130 return new JavaTypeProfile(newNullSeen, newNotRecordedTypeProbability, newResult); | |
131 } | |
132 return this; | |
133 } | |
134 | |
135 @Override | |
136 public boolean equals(Object other) { | |
137 return super.equals(other) && nullSeen.equals(((JavaTypeProfile) other).nullSeen); | |
138 } | |
139 | |
140 @Override | |
141 public int hashCode() { | |
142 return nullSeen.hashCode() + super.hashCode(); | |
143 } | |
144 | |
145 public static class ProfiledType extends AbstractProfiledItem<ResolvedJavaType> { | |
146 | |
147 public ProfiledType(ResolvedJavaType type, double probability) { | |
148 super(type, probability); | |
149 assert type.isArray() || type.isConcrete() : type; | |
150 } | |
151 | |
152 /** | |
153 * Returns the type for this profile entry. | |
154 */ | |
155 public ResolvedJavaType getType() { | |
156 return getItem(); | |
157 } | |
158 | |
159 @Override | |
160 public String toString() { | |
161 return String.format("%.6f#%s", probability, item); | |
162 } | |
163 } | |
164 | |
165 @Override | |
166 public String toString() { | |
167 StringBuilder buf = new StringBuilder("JavaTypeProfile<nullSeen=").append(getNullSeen()).append(", types=["); | |
168 for (int j = 0; j < getTypes().length; j++) { | |
169 if (j != 0) { | |
170 buf.append(", "); | |
171 } | |
172 ProfiledType ptype = getTypes()[j]; | |
173 buf.append(String.format("%.6f:%s", ptype.getProbability(), ptype.getType())); | |
174 } | |
175 return buf.append(String.format("], notRecorded:%.6f>", getNotRecordedProbability())).toString(); | |
176 } | |
177 } |