Mercurial > hg > graal-jvmci-8
comparison graal/Compiler/src/com/sun/c1x/ir/LoadField.java @ 2507:9ec15d6914ca
Pull over of compiler from maxine repository.
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
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date | Wed, 27 Apr 2011 11:43:22 +0200 |
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2506:4a3bf8a5bf41 | 2507:9ec15d6914ca |
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1 /* | |
2 * Copyright (c) 2009, 2011, 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.sun.c1x.ir; | |
24 | |
25 import com.sun.c1x.*; | |
26 import com.sun.c1x.debug.*; | |
27 import com.sun.c1x.value.*; | |
28 import com.sun.cri.ci.*; | |
29 import com.sun.cri.ri.*; | |
30 | |
31 /** | |
32 * The {@code LoadField} instruction represents a read of a static or instance field. | |
33 * | |
34 * @author Ben L. Titzer | |
35 */ | |
36 public final class LoadField extends AccessField { | |
37 | |
38 /** | |
39 * Creates a new LoadField instance. | |
40 * @param object the receiver object | |
41 * @param field the compiler interface field | |
42 * @param isStatic indicates if the field is static | |
43 * @param stateBefore the state before the field access | |
44 * @param isLoaded indicates if the class is loaded | |
45 */ | |
46 public LoadField(Value object, RiField field, boolean isStatic, FrameState stateBefore, boolean isLoaded) { | |
47 super(field.kind().stackKind(), object, field, isStatic, stateBefore, isLoaded); | |
48 } | |
49 | |
50 /** | |
51 * Gets the declared type of the field being accessed. | |
52 * @return the declared type of the field being accessed. | |
53 */ | |
54 @Override | |
55 public RiType declaredType() { | |
56 return field().type(); | |
57 } | |
58 | |
59 /** | |
60 * Gets the exact type of the field being accessed. If the field type is | |
61 * a primitive array or an instance class and the class is loaded and final, | |
62 * then the exact type is the same as the declared type. Otherwise it is {@code null} | |
63 * @return the exact type of the field if known; {@code null} otherwise | |
64 */ | |
65 @Override | |
66 public RiType exactType() { | |
67 RiType declaredType = declaredType(); | |
68 return declaredType.isResolved() ? declaredType.exactType() : null; | |
69 } | |
70 | |
71 @Override | |
72 public void accept(ValueVisitor v) { | |
73 v.visitLoadField(this); | |
74 } | |
75 | |
76 /** | |
77 * Gets a constant value to which this load can be reduced. | |
78 * | |
79 * @return {@code null} if this load cannot be reduced to a constant | |
80 */ | |
81 public CiConstant constantValue() { | |
82 if (!C1XOptions.CanonicalizeConstantFields) { | |
83 return null; | |
84 } | |
85 if (isStatic()) { | |
86 return field.constantValue(null); | |
87 } else if (object().isConstant()) { | |
88 CiConstant cons = field.constantValue(object().asConstant()); | |
89 if (cons != null) { | |
90 return cons; | |
91 } | |
92 return cons; | |
93 } | |
94 return null; | |
95 } | |
96 | |
97 @Override | |
98 public void print(LogStream out) { | |
99 out.print(object()). | |
100 print("."). | |
101 print(field.name()). | |
102 print(" [field: "). | |
103 print(CiUtil.format("%h.%n:%t", field, false)). | |
104 print("]"); | |
105 } | |
106 } |