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comparison graal/Compiler/src/com/sun/c1x/ir/AccessField.java @ 2507:9ec15d6914ca

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Pull over of compiler from maxine repository.
author Thomas Wuerthinger <thomas@wuerthinger.net>
date Wed, 27 Apr 2011 11:43:22 +0200
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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 java.lang.reflect.*;
26
27 import com.sun.c1x.*;
28 import com.sun.c1x.value.*;
29 import com.sun.cri.ci.*;
30 import com.sun.cri.ri.*;
31
32 /**
33 * The base class of all instructions that access fields.
34 *
35 * @author Ben L. Titzer
36 */
37 public abstract class AccessField extends StateSplit {
38
39 private Value object;
40 protected final RiField field;
41
42 /**
43 * Constructs a new access field object.
44 * @param kind the result kind of the access
45 * @param object the instruction producing the receiver object
46 * @param field the compiler interface representation of the field
47 * @param isStatic indicates if the field is static
48 * @param stateBefore the state before the field access
49 * @param isLoaded indicates if the class is loaded
50 */
51 public AccessField(CiKind kind, Value object, RiField field, boolean isStatic, FrameState stateBefore, boolean isLoaded) {
52 super(kind, stateBefore);
53 this.object = object;
54 this.field = field;
55 if (!isLoaded || (C1XOptions.TestPatching && !Modifier.isVolatile(field.accessFlags()))) {
56 // require patching if the field is not loaded (i.e. resolved),
57 // or if patch testing is turned on (but not if the field is volatile)
58 setFlag(Flag.NeedsPatching);
59 }
60 initFlag(Flag.IsLoaded, isLoaded);
61 initFlag(Flag.IsStatic, isStatic);
62 if (isLoaded && object.isNonNull()) {
63 eliminateNullCheck();
64 }
65 assert object != null : "every field access must reference some object";
66 }
67
68 /**
69 * Gets the instruction that produces the receiver object of this field access
70 * (for instance field accesses).
71 * @return the instruction that produces the receiver object
72 */
73 public Value object() {
74 return object;
75 }
76
77 /**
78 * Gets the compiler interface field for this field access.
79 * @return the compiler interface field for this field access
80 */
81 public RiField field() {
82 return field;
83 }
84
85 /**
86 * Checks whether this field access is an access to a static field.
87 * @return {@code true} if this field access is to a static field
88 */
89 public boolean isStatic() {
90 return checkFlag(Flag.IsStatic);
91 }
92
93 /**
94 * Checks whether the class of the field of this access is loaded.
95 * @return {@code true} if the class is loaded
96 */
97 public boolean isLoaded() {
98 return checkFlag(Flag.IsLoaded);
99 }
100
101 /**
102 * Checks whether this field is declared volatile.
103 * @return {@code true} if the field is resolved and declared volatile
104 */
105 public boolean isVolatile() {
106 return isLoaded() && Modifier.isVolatile(field.accessFlags());
107 }
108
109 @Override
110 public void runtimeCheckCleared() {
111 if (isLoaded()) {
112 clearState();
113 }
114 }
115
116 /**
117 * Checks whether this field access will require patching.
118 * @return {@code true} if this field access will require patching
119 */
120 public boolean needsPatching() {
121 return checkFlag(Flag.NeedsPatching);
122 }
123
124 /**
125 * Checks whether this field access may cause a trap or an exception, which
126 * is if it either requires a null check or needs patching.
127 * @return {@code true} if this field access can cause a trap
128 */
129 @Override
130 public boolean canTrap() {
131 return needsPatching() || needsNullCheck();
132 }
133
134 @Override
135 public void inputValuesDo(ValueClosure closure) {
136 object = closure.apply(object);
137 }
138 }