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comparison truffle/com.oracle.truffle.api/src/com/oracle/truffle/api/utilities/ExactClassValueProfile.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/src/com/oracle/truffle/api/utilities/ExactClassValueProfile.java@405257253e59
children 02015aac6be9
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21950:2a5011c7e641 21951:9c8c0937da41
1 /*
2 * Copyright (c) 2014, 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.utilities;
26
27 import com.oracle.truffle.api.*;
28 import com.oracle.truffle.api.CompilerDirectives.CompilationFinal;
29
30 /**
31 * Represents a {@link ValueProfile} that speculates on the exact class of a value.
32 */
33 public final class ExactClassValueProfile extends ValueProfile {
34
35 @CompilationFinal protected Class<?> cachedClass;
36
37 ExactClassValueProfile() {
38 }
39
40 @SuppressWarnings("unchecked")
41 @Override
42 public <T> T profile(T value) {
43 if (cachedClass != Object.class) {
44 if (cachedClass != null && cachedClass.isInstance(value)) {
45 return (T) cachedClass.cast(value);
46 } else {
47 CompilerDirectives.transferToInterpreterAndInvalidate();
48 if (cachedClass == null && value != null) {
49 cachedClass = value.getClass();
50 } else {
51 cachedClass = Object.class;
52 }
53 }
54 }
55 return value;
56 }
57
58 public boolean isGeneric() {
59 return cachedClass == Object.class;
60 }
61
62 public boolean isUninitialized() {
63 return cachedClass == null;
64 }
65
66 public Class<?> getCachedClass() {
67 return cachedClass;
68 }
69
70 @Override
71 public String toString() {
72 return String.format("%s(%s)@%x", getClass().getSimpleName(), isUninitialized() ? "uninitialized" : (isGeneric() ? "generic" : cachedClass.getName()), hashCode());
73 }
74 }