Mercurial > hg > truffle
annotate src/share/vm/ci/ciField.hpp @ 497:7aadaf46ecd7
Merge
author | jmasa |
---|---|
date | Fri, 19 Dec 2008 12:15:34 -0800 |
parents | d1605aabd0a1 |
children | dd57230ba8fe |
rev | line source |
---|---|
0 | 1 /* |
196 | 2 * Copyright 1999-2008 Sun Microsystems, Inc. All Rights Reserved. |
0 | 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 // ciField | |
26 // | |
27 // This class represents the result of a field lookup in the VM. | |
28 // The lookup may not succeed, in which case the information in | |
29 // the ciField will be incomplete. | |
30 class ciField : public ResourceObj { | |
31 CI_PACKAGE_ACCESS | |
32 friend class ciEnv; | |
33 friend class ciInstanceKlass; | |
34 friend class NonStaticFieldFiller; | |
35 | |
36 private: | |
37 ciFlags _flags; | |
38 ciInstanceKlass* _holder; | |
39 ciSymbol* _name; | |
40 ciSymbol* _signature; | |
41 ciType* _type; | |
42 int _offset; | |
43 bool _is_constant; | |
44 ciInstanceKlass* _known_to_link_with; | |
45 ciConstant _constant_value; | |
46 | |
47 // Used for will_link | |
48 int _cp_index; | |
49 | |
50 ciType* compute_type(); | |
51 ciType* compute_type_impl(); | |
52 | |
53 ciField(ciInstanceKlass* klass, int index); | |
54 ciField(fieldDescriptor* fd); | |
55 | |
56 // shared constructor code | |
57 void initialize_from(fieldDescriptor* fd); | |
58 | |
59 // The implementation of the print method. | |
60 void print_impl(outputStream* st); | |
61 | |
62 public: | |
63 ciFlags flags() { return _flags; } | |
64 | |
65 // Of which klass is this field a member? | |
66 // | |
67 // Usage note: the declared holder of a field is the class | |
68 // referenced by name in the bytecodes. The canonical holder | |
69 // is the most general class which holds the field. This | |
70 // method returns the canonical holder. The declared holder | |
71 // can be accessed via a method in ciBytecodeStream. | |
72 // | |
73 // Ex. | |
74 // class A { | |
75 // public int f = 7; | |
76 // } | |
77 // class B extends A { | |
78 // public void test() { | |
79 // System.out.println(f); | |
80 // } | |
81 // } | |
82 // | |
83 // A java compiler is permitted to compile the access to | |
84 // field f as: | |
85 // | |
86 // getfield B.f | |
87 // | |
88 // In that case the declared holder of f would be B and | |
89 // the canonical holder of f would be A. | |
90 ciInstanceKlass* holder() { return _holder; } | |
91 | |
92 // Name of this field? | |
93 ciSymbol* name() { return _name; } | |
94 | |
95 // Signature of this field? | |
96 ciSymbol* signature() { return _signature; } | |
97 | |
98 // Of what type is this field? | |
99 ciType* type() { return (_type == NULL) ? compute_type() : _type; } | |
100 | |
101 // How is this field actually stored in memory? | |
102 BasicType layout_type() { return type2field[(_type == NULL) ? T_OBJECT : _type->basic_type()]; } | |
103 | |
104 // How big is this field in memory? | |
29
d5fc211aea19
6633953: type2aelembytes{T_ADDRESS} should be 8 bytes in 64 bit VM
kvn
parents:
0
diff
changeset
|
105 int size_in_bytes() { return type2aelembytes(layout_type()); } |
0 | 106 |
107 // What is the offset of this field? | |
108 int offset() { | |
109 assert(_offset >= 1, "illegal call to offset()"); | |
110 return _offset; | |
111 } | |
112 | |
113 // Same question, explicit units. (Fields are aligned to the byte level.) | |
114 int offset_in_bytes() { | |
115 return offset(); | |
116 } | |
117 | |
118 // Is this field shared? | |
119 bool is_shared() { | |
120 // non-static fields of shared holders are cached | |
121 return _holder->is_shared() && !is_static(); | |
122 } | |
123 | |
124 // Is this field a constant? | |
125 // | |
126 // Clarification: A field is considered constant if: | |
127 // 1. The field is both static and final | |
128 // 2. The canonical holder of the field has undergone | |
129 // static initialization. | |
130 // 3. If the field is an object or array, then the oop | |
131 // in question is allocated in perm space. | |
132 // 4. The field is not one of the special static/final | |
133 // non-constant fields. These are java.lang.System.in | |
134 // and java.lang.System.out. Abomination. | |
135 // | |
136 // Note: the check for case 4 is not yet implemented. | |
137 bool is_constant() { return _is_constant; } | |
138 | |
139 // Get the constant value of this field. | |
140 ciConstant constant_value() { | |
141 assert(is_constant(), "illegal call to constant_value()"); | |
142 return _constant_value; | |
143 } | |
144 | |
145 // Check for link time errors. Accessing a field from a | |
146 // certain class via a certain bytecode may or may not be legal. | |
147 // This call checks to see if an exception may be raised by | |
148 // an access of this field. | |
149 // | |
150 // Usage note: if the same field is accessed multiple times | |
151 // in the same compilation, will_link will need to be checked | |
152 // at each point of access. | |
153 bool will_link(ciInstanceKlass* accessing_klass, | |
154 Bytecodes::Code bc); | |
155 | |
156 // Java access flags | |
157 bool is_public () { return flags().is_public(); } | |
158 bool is_private () { return flags().is_private(); } | |
159 bool is_protected () { return flags().is_protected(); } | |
160 bool is_static () { return flags().is_static(); } | |
161 bool is_final () { return flags().is_final(); } | |
162 bool is_volatile () { return flags().is_volatile(); } | |
163 bool is_transient () { return flags().is_transient(); } | |
164 | |
165 // Debugging output | |
166 void print(); | |
167 void print_name_on(outputStream* st); | |
168 }; |