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comparison src/share/vm/oops/oop.hpp @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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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 };