Mercurial > hg > truffle
annotate src/share/vm/oops/fieldInfo.hpp @ 7788:dbbe8ce3bfa5
commands: accept 'server0' as a vm, accept version number which have '-...' suffix (-internal, -ea...)
author | Gilles Duboscq <duboscq@ssw.jku.at> |
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date | Wed, 13 Feb 2013 18:33:54 +0100 |
parents | 4a916f2ce331 |
children | be4d5c6c1f79 |
rev | line source |
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3938 | 1 /* |
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2 * Copyright (c) 2011, 2012, Oracle and/or its affiliates. All rights reserved. |
3938 | 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 */ | |
24 | |
25 #ifndef SHARE_VM_OOPS_FIELDINFO_HPP | |
26 #define SHARE_VM_OOPS_FIELDINFO_HPP | |
27 | |
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28 #include "oops/constantPool.hpp" |
3938 | 29 #include "oops/typeArrayOop.hpp" |
30 #include "classfile/vmSymbols.hpp" | |
31 | |
32 // This class represents the field information contained in the fields | |
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33 // array of an InstanceKlass. Currently it's laid on top an array of |
3938 | 34 // Java shorts but in the future it could simply be used as a real |
35 // array type. FieldInfo generally shouldn't be used directly. | |
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36 // Fields should be queried either through InstanceKlass or through |
3938 | 37 // the various FieldStreams. |
38 class FieldInfo VALUE_OBJ_CLASS_SPEC { | |
39 friend class fieldDescriptor; | |
40 friend class JavaFieldStream; | |
41 friend class ClassFileParser; | |
42 | |
43 public: | |
44 // fields | |
45 // Field info extracted from the class file and stored | |
7587 | 46 // as an array of 6 shorts. |
47 | |
48 #define FIELDINFO_TAG_SIZE 2 | |
49 #define FIELDINFO_TAG_BLANK 0 | |
50 #define FIELDINFO_TAG_OFFSET 1 | |
51 #define FIELDINFO_TAG_TYPE_PLAIN 2 | |
52 #define FIELDINFO_TAG_TYPE_CONTENDED 3 | |
53 #define FIELDINFO_TAG_MASK 3 | |
54 | |
55 // Packed field has the tag, and can be either of: | |
56 // hi bits <--------------------------- lo bits | |
57 // |---------high---------|---------low---------| | |
58 // ..........................................00 - blank | |
59 // [------------------offset----------------]01 - real field offset | |
60 // ......................[-------type-------]10 - plain field with type | |
61 // [--contention_group--][-------type-------]11 - contended field with type and contention group | |
3938 | 62 enum FieldOffset { |
63 access_flags_offset = 0, | |
64 name_index_offset = 1, | |
65 signature_index_offset = 2, | |
66 initval_index_offset = 3, | |
7587 | 67 low_packed_offset = 4, |
68 high_packed_offset = 5, | |
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69 field_slots = 6 |
3938 | 70 }; |
71 | |
72 private: | |
73 u2 _shorts[field_slots]; | |
74 | |
75 void set_name_index(u2 val) { _shorts[name_index_offset] = val; } | |
76 void set_signature_index(u2 val) { _shorts[signature_index_offset] = val; } | |
77 void set_initval_index(u2 val) { _shorts[initval_index_offset] = val; } | |
78 | |
79 u2 name_index() const { return _shorts[name_index_offset]; } | |
80 u2 signature_index() const { return _shorts[signature_index_offset]; } | |
81 u2 initval_index() const { return _shorts[initval_index_offset]; } | |
82 | |
83 public: | |
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84 static FieldInfo* from_field_array(Array<u2>* fields, int index) { |
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85 return ((FieldInfo*)fields->adr_at(index * field_slots)); |
3938 | 86 } |
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87 static FieldInfo* from_field_array(u2* fields, int index) { |
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88 return ((FieldInfo*)(fields + index * field_slots)); |
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89 } |
3938 | 90 |
91 void initialize(u2 access_flags, | |
92 u2 name_index, | |
93 u2 signature_index, | |
7587 | 94 u2 initval_index) { |
3938 | 95 _shorts[access_flags_offset] = access_flags; |
96 _shorts[name_index_offset] = name_index; | |
97 _shorts[signature_index_offset] = signature_index; | |
98 _shorts[initval_index_offset] = initval_index; | |
7587 | 99 _shorts[low_packed_offset] = 0; |
100 _shorts[high_packed_offset] = 0; | |
3938 | 101 } |
102 | |
103 u2 access_flags() const { return _shorts[access_flags_offset]; } | |
7587 | 104 u4 offset() const { |
105 u2 lo = _shorts[low_packed_offset]; | |
106 switch(lo & FIELDINFO_TAG_MASK) { | |
107 case FIELDINFO_TAG_OFFSET: | |
108 return build_int_from_shorts(_shorts[low_packed_offset], _shorts[high_packed_offset]) >> FIELDINFO_TAG_SIZE; | |
109 #ifndef PRODUCT | |
110 case FIELDINFO_TAG_TYPE_PLAIN: | |
111 ShouldNotReachHere2("Asking offset for the plain type field"); | |
112 case FIELDINFO_TAG_TYPE_CONTENDED: | |
113 ShouldNotReachHere2("Asking offset for the contended type field"); | |
114 case FIELDINFO_TAG_BLANK: | |
115 ShouldNotReachHere2("Asking offset for the blank field"); | |
116 #endif | |
117 } | |
118 ShouldNotReachHere(); | |
119 return 0; | |
120 } | |
121 | |
122 bool is_contended() const { | |
123 u2 lo = _shorts[low_packed_offset]; | |
124 switch(lo & FIELDINFO_TAG_MASK) { | |
125 case FIELDINFO_TAG_TYPE_PLAIN: | |
126 return false; | |
127 case FIELDINFO_TAG_TYPE_CONTENDED: | |
128 return true; | |
129 #ifndef PRODUCT | |
130 case FIELDINFO_TAG_OFFSET: | |
131 ShouldNotReachHere2("Asking contended flag for the field with offset"); | |
132 case FIELDINFO_TAG_BLANK: | |
133 ShouldNotReachHere2("Asking contended flag for the blank field"); | |
134 #endif | |
135 } | |
136 ShouldNotReachHere(); | |
137 return false; | |
138 } | |
139 | |
140 u2 contended_group() const { | |
141 u2 lo = _shorts[low_packed_offset]; | |
142 switch(lo & FIELDINFO_TAG_MASK) { | |
143 case FIELDINFO_TAG_TYPE_PLAIN: | |
144 return 0; | |
145 case FIELDINFO_TAG_TYPE_CONTENDED: | |
146 return _shorts[high_packed_offset]; | |
147 #ifndef PRODUCT | |
148 case FIELDINFO_TAG_OFFSET: | |
149 ShouldNotReachHere2("Asking the contended group for the field with offset"); | |
150 case FIELDINFO_TAG_BLANK: | |
151 ShouldNotReachHere2("Asking the contended group for the blank field"); | |
152 #endif | |
153 } | |
154 ShouldNotReachHere(); | |
155 return 0; | |
156 } | |
157 | |
158 u2 allocation_type() const { | |
159 u2 lo = _shorts[low_packed_offset]; | |
160 switch(lo & FIELDINFO_TAG_MASK) { | |
161 case FIELDINFO_TAG_TYPE_PLAIN: | |
162 case FIELDINFO_TAG_TYPE_CONTENDED: | |
163 return (lo >> FIELDINFO_TAG_SIZE); | |
164 #ifndef PRODUCT | |
165 case FIELDINFO_TAG_OFFSET: | |
166 ShouldNotReachHere2("Asking the field type for field with offset"); | |
167 case FIELDINFO_TAG_BLANK: | |
168 ShouldNotReachHere2("Asking the field type for the blank field"); | |
169 #endif | |
170 } | |
171 ShouldNotReachHere(); | |
172 return 0; | |
173 } | |
174 | |
175 bool is_offset_set() const { | |
176 return (_shorts[low_packed_offset] & FIELDINFO_TAG_MASK) == FIELDINFO_TAG_OFFSET; | |
177 } | |
3938 | 178 |
179 Symbol* name(constantPoolHandle cp) const { | |
180 int index = name_index(); | |
181 if (is_internal()) { | |
182 return lookup_symbol(index); | |
183 } | |
184 return cp->symbol_at(index); | |
185 } | |
186 | |
187 Symbol* signature(constantPoolHandle cp) const { | |
188 int index = signature_index(); | |
189 if (is_internal()) { | |
190 return lookup_symbol(index); | |
191 } | |
192 return cp->symbol_at(index); | |
193 } | |
194 | |
195 void set_access_flags(u2 val) { _shorts[access_flags_offset] = val; } | |
196 void set_offset(u4 val) { | |
7587 | 197 val = val << FIELDINFO_TAG_SIZE; // make room for tag |
198 _shorts[low_packed_offset] = extract_low_short_from_int(val) | FIELDINFO_TAG_OFFSET; | |
199 _shorts[high_packed_offset] = extract_high_short_from_int(val); | |
200 } | |
201 | |
202 void set_allocation_type(int type) { | |
203 u2 lo = _shorts[low_packed_offset]; | |
204 switch(lo & FIELDINFO_TAG_MASK) { | |
205 case FIELDINFO_TAG_BLANK: | |
206 _shorts[low_packed_offset] = ((type << FIELDINFO_TAG_SIZE)) & 0xFFFF; | |
207 _shorts[low_packed_offset] &= ~FIELDINFO_TAG_MASK; | |
208 _shorts[low_packed_offset] |= FIELDINFO_TAG_TYPE_PLAIN; | |
209 return; | |
210 #ifndef PRODUCT | |
211 case FIELDINFO_TAG_TYPE_PLAIN: | |
212 case FIELDINFO_TAG_TYPE_CONTENDED: | |
213 case FIELDINFO_TAG_OFFSET: | |
214 ShouldNotReachHere2("Setting the field type with overwriting"); | |
215 #endif | |
216 } | |
217 ShouldNotReachHere(); | |
218 } | |
219 | |
220 void set_contended_group(u2 val) { | |
221 u2 lo = _shorts[low_packed_offset]; | |
222 switch(lo & FIELDINFO_TAG_MASK) { | |
223 case FIELDINFO_TAG_TYPE_PLAIN: | |
224 _shorts[low_packed_offset] |= FIELDINFO_TAG_TYPE_CONTENDED; | |
225 _shorts[high_packed_offset] = val; | |
226 return; | |
227 #ifndef PRODUCT | |
228 case FIELDINFO_TAG_TYPE_CONTENDED: | |
229 ShouldNotReachHere2("Overwriting contended group"); | |
230 case FIELDINFO_TAG_BLANK: | |
231 ShouldNotReachHere2("Setting contended group for the blank field"); | |
232 case FIELDINFO_TAG_OFFSET: | |
233 ShouldNotReachHere2("Setting contended group for field with offset"); | |
234 #endif | |
235 } | |
236 ShouldNotReachHere(); | |
3938 | 237 } |
238 | |
239 bool is_internal() const { | |
240 return (access_flags() & JVM_ACC_FIELD_INTERNAL) != 0; | |
241 } | |
242 | |
243 Symbol* lookup_symbol(int symbol_index) const { | |
244 assert(is_internal(), "only internal fields"); | |
245 return vmSymbols::symbol_at((vmSymbols::SID)symbol_index); | |
246 } | |
247 }; | |
248 | |
249 #endif // SHARE_VM_OOPS_FIELDINFO_HPP |