Mercurial > hg > truffle
comparison src/share/vm/oops/oop.hpp @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
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children | ba764ed4b6f2 |
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1 /* | |
2 * Copyright 1997-2007 Sun Microsystems, Inc. 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 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 // oopDesc is the top baseclass for objects classes. The {name}Desc classes describe | |
26 // the format of Java objects so the fields can be accessed from C++. | |
27 // oopDesc is abstract. | |
28 // (see oopHierarchy for complete oop class hierarchy) | |
29 // | |
30 // no virtual functions allowed | |
31 | |
32 // store into oop with store check | |
33 void oop_store(oop* p, oop v); | |
34 void oop_store(volatile oop* p, oop v); | |
35 | |
36 // store into oop without store check | |
37 void oop_store_without_check(oop* p, oop v); | |
38 void oop_store_without_check(volatile oop* p, oop v); | |
39 | |
40 | |
41 extern bool always_do_update_barrier; | |
42 | |
43 // Forward declarations. | |
44 class OopClosure; | |
45 class ScanClosure; | |
46 class FastScanClosure; | |
47 class FilteringClosure; | |
48 class BarrierSet; | |
49 class CMSIsAliveClosure; | |
50 | |
51 class PSPromotionManager; | |
52 class ParCompactionManager; | |
53 | |
54 class oopDesc { | |
55 friend class VMStructs; | |
56 private: | |
57 volatile markOop _mark; | |
58 klassOop _klass; | |
59 | |
60 // Fast access to barrier set. Must be initialized. | |
61 static BarrierSet* _bs; | |
62 | |
63 public: | |
64 markOop mark() const { return _mark; } | |
65 markOop* mark_addr() const { return (markOop*) &_mark; } | |
66 | |
67 void set_mark(volatile markOop m) { _mark = m; } | |
68 | |
69 void release_set_mark(markOop m); | |
70 markOop cas_set_mark(markOop new_mark, markOop old_mark); | |
71 | |
72 // Used only to re-initialize the mark word (e.g., of promoted | |
73 // objects during a GC) -- requires a valid klass pointer | |
74 void init_mark(); | |
75 | |
76 klassOop klass() const { return _klass; } | |
77 oop* klass_addr() const { return (oop*) &_klass; } | |
78 | |
79 void set_klass(klassOop k); | |
80 // For when the klass pointer is being used as a linked list "next" field. | |
81 void set_klass_to_list_ptr(oop k); | |
82 | |
83 // size of object header | |
84 static int header_size() { return sizeof(oopDesc)/HeapWordSize; } | |
85 static int header_size_in_bytes() { return sizeof(oopDesc); } | |
86 | |
87 Klass* blueprint() const; | |
88 | |
89 // Returns whether this is an instance of k or an instance of a subclass of k | |
90 bool is_a(klassOop k) const; | |
91 | |
92 // Returns the actual oop size of the object | |
93 int size(); | |
94 | |
95 // Sometimes (for complicated concurrency-related reasons), it is useful | |
96 // to be able to figure out the size of an object knowing its klass. | |
97 int size_given_klass(Klass* klass); | |
98 | |
99 // Some perm gen objects are not parseble immediately after | |
100 // installation of their klass pointer. | |
101 bool is_parsable(); | |
102 | |
103 // type test operations (inlined in oop.inline.h) | |
104 bool is_instance() const; | |
105 bool is_instanceRef() const; | |
106 bool is_array() const; | |
107 bool is_objArray() const; | |
108 bool is_symbol() const; | |
109 bool is_klass() const; | |
110 bool is_thread() const; | |
111 bool is_method() const; | |
112 bool is_constMethod() const; | |
113 bool is_methodData() const; | |
114 bool is_constantPool() const; | |
115 bool is_constantPoolCache() const; | |
116 bool is_typeArray() const; | |
117 bool is_javaArray() const; | |
118 bool is_compiledICHolder() const; | |
119 | |
120 private: | |
121 // field addresses in oop | |
122 // byte/char/bool/short fields are always stored as full words | |
123 void* field_base(int offset) const; | |
124 | |
125 jbyte* byte_field_addr(int offset) const; | |
126 jchar* char_field_addr(int offset) const; | |
127 jboolean* bool_field_addr(int offset) const; | |
128 jint* int_field_addr(int offset) const; | |
129 jshort* short_field_addr(int offset) const; | |
130 jlong* long_field_addr(int offset) const; | |
131 jfloat* float_field_addr(int offset) const; | |
132 jdouble* double_field_addr(int offset) const; | |
133 | |
134 public: | |
135 // need this as public for garbage collection | |
136 oop* obj_field_addr(int offset) const; | |
137 | |
138 oop obj_field(int offset) const; | |
139 void obj_field_put(int offset, oop value); | |
140 | |
141 jbyte byte_field(int offset) const; | |
142 void byte_field_put(int offset, jbyte contents); | |
143 | |
144 jchar char_field(int offset) const; | |
145 void char_field_put(int offset, jchar contents); | |
146 | |
147 jboolean bool_field(int offset) const; | |
148 void bool_field_put(int offset, jboolean contents); | |
149 | |
150 jint int_field(int offset) const; | |
151 void int_field_put(int offset, jint contents); | |
152 | |
153 jshort short_field(int offset) const; | |
154 void short_field_put(int offset, jshort contents); | |
155 | |
156 jlong long_field(int offset) const; | |
157 void long_field_put(int offset, jlong contents); | |
158 | |
159 jfloat float_field(int offset) const; | |
160 void float_field_put(int offset, jfloat contents); | |
161 | |
162 jdouble double_field(int offset) const; | |
163 void double_field_put(int offset, jdouble contents); | |
164 | |
165 oop obj_field_acquire(int offset) const; | |
166 void release_obj_field_put(int offset, oop value); | |
167 | |
168 jbyte byte_field_acquire(int offset) const; | |
169 void release_byte_field_put(int offset, jbyte contents); | |
170 | |
171 jchar char_field_acquire(int offset) const; | |
172 void release_char_field_put(int offset, jchar contents); | |
173 | |
174 jboolean bool_field_acquire(int offset) const; | |
175 void release_bool_field_put(int offset, jboolean contents); | |
176 | |
177 jint int_field_acquire(int offset) const; | |
178 void release_int_field_put(int offset, jint contents); | |
179 | |
180 jshort short_field_acquire(int offset) const; | |
181 void release_short_field_put(int offset, jshort contents); | |
182 | |
183 jlong long_field_acquire(int offset) const; | |
184 void release_long_field_put(int offset, jlong contents); | |
185 | |
186 jfloat float_field_acquire(int offset) const; | |
187 void release_float_field_put(int offset, jfloat contents); | |
188 | |
189 jdouble double_field_acquire(int offset) const; | |
190 void release_double_field_put(int offset, jdouble contents); | |
191 | |
192 // printing functions for VM debugging | |
193 void print_on(outputStream* st) const; // First level print | |
194 void print_value_on(outputStream* st) const; // Second level print. | |
195 void print_address_on(outputStream* st) const; // Address printing | |
196 | |
197 // printing on default output stream | |
198 void print(); | |
199 void print_value(); | |
200 void print_address(); | |
201 | |
202 // return the print strings | |
203 char* print_string(); | |
204 char* print_value_string(); | |
205 | |
206 // verification operations | |
207 void verify_on(outputStream* st); | |
208 void verify(); | |
209 void verify_old_oop(oop* p, bool allow_dirty); | |
210 | |
211 // tells whether this oop is partially constructed (gc during class loading) | |
212 bool partially_loaded(); | |
213 void set_partially_loaded(); | |
214 | |
215 // locking operations | |
216 bool is_locked() const; | |
217 bool is_unlocked() const; | |
218 bool has_bias_pattern() const; | |
219 | |
220 // asserts | |
221 bool is_oop(bool ignore_mark_word = false) const; | |
222 bool is_oop_or_null(bool ignore_mark_word = false) const; | |
223 #ifndef PRODUCT | |
224 bool is_unlocked_oop() const; | |
225 #endif | |
226 | |
227 // garbage collection | |
228 bool is_gc_marked() const; | |
229 // Apply "MarkSweep::mark_and_push" to (the address of) every non-NULL | |
230 // reference field in "this". | |
231 void follow_contents(); | |
232 void follow_header(); | |
233 | |
234 #ifndef SERIALGC | |
235 // Parallel Scavenge | |
236 void copy_contents(PSPromotionManager* pm); | |
237 void push_contents(PSPromotionManager* pm); | |
238 | |
239 // Parallel Old | |
240 void update_contents(ParCompactionManager* cm); | |
241 void update_contents(ParCompactionManager* cm, | |
242 HeapWord* begin_limit, | |
243 HeapWord* end_limit); | |
244 void update_contents(ParCompactionManager* cm, | |
245 klassOop old_klass, | |
246 HeapWord* begin_limit, | |
247 HeapWord* end_limit); | |
248 | |
249 void follow_contents(ParCompactionManager* cm); | |
250 void follow_header(ParCompactionManager* cm); | |
251 #endif // SERIALGC | |
252 | |
253 bool is_perm() const; | |
254 bool is_perm_or_null() const; | |
255 bool is_shared() const; | |
256 bool is_shared_readonly() const; | |
257 bool is_shared_readwrite() const; | |
258 | |
259 // Forward pointer operations for scavenge | |
260 bool is_forwarded() const; | |
261 | |
262 void forward_to(oop p); | |
263 bool cas_forward_to(oop p, markOop compare); | |
264 | |
265 #ifndef SERIALGC | |
266 // Like "forward_to", but inserts the forwarding pointer atomically. | |
267 // Exactly one thread succeeds in inserting the forwarding pointer, and | |
268 // this call returns "NULL" for that thread; any other thread has the | |
269 // value of the forwarding pointer returned and does not modify "this". | |
270 oop forward_to_atomic(oop p); | |
271 #endif // SERIALGC | |
272 | |
273 oop forwardee() const; | |
274 | |
275 // Age of object during scavenge | |
276 int age() const; | |
277 void incr_age(); | |
278 | |
279 // Adjust all pointers in this object to point at it's forwarded location and | |
280 // return the size of this oop. This is used by the MarkSweep collector. | |
281 int adjust_pointers(); | |
282 void adjust_header(); | |
283 | |
284 #ifndef SERIALGC | |
285 // Parallel old | |
286 void update_header(); | |
287 void update_header(HeapWord* beg_addr, HeapWord* end_addr); | |
288 #endif // SERIALGC | |
289 | |
290 // mark-sweep support | |
291 void follow_body(int begin, int end); | |
292 | |
293 // Fast access to barrier set | |
294 static BarrierSet* bs() { return _bs; } | |
295 static void set_bs(BarrierSet* bs) { _bs = bs; } | |
296 | |
297 // iterators, returns size of object | |
298 #define OOP_ITERATE_DECL(OopClosureType, nv_suffix) \ | |
299 int oop_iterate(OopClosureType* blk); \ | |
300 int oop_iterate(OopClosureType* blk, MemRegion mr); // Only in mr. | |
301 | |
302 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_ITERATE_DECL) | |
303 ALL_OOP_OOP_ITERATE_CLOSURES_3(OOP_ITERATE_DECL) | |
304 | |
305 void oop_iterate_header(OopClosure* blk); | |
306 void oop_iterate_header(OopClosure* blk, MemRegion mr); | |
307 | |
308 // identity hash; returns the identity hash key (computes it if necessary) | |
309 // NOTE with the introduction of UseBiasedLocking that identity_hash() might reach a | |
310 // safepoint if called on a biased object. Calling code must be aware of that. | |
311 intptr_t identity_hash(); | |
312 intptr_t slow_identity_hash(); | |
313 | |
314 // marks are forwarded to stack when object is locked | |
315 bool has_displaced_mark() const; | |
316 markOop displaced_mark() const; | |
317 void set_displaced_mark(markOop m); | |
318 | |
319 // for code generation | |
320 static int klass_offset_in_bytes() { return offset_of(oopDesc, _klass); } | |
321 static int mark_offset_in_bytes() { return offset_of(oopDesc, _mark); } | |
322 }; |