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comparison src/share/vm/memory/universe.hpp @ 0:a61af66fc99e jdk7-b24

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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 // Universe is a name space holding known system classes and objects in the VM.
26 //
27 // Loaded classes are accessible through the SystemDictionary.
28 //
29 // The object heap is allocated and accessed through Universe, and various allocation
30 // support is provided. Allocation by the interpreter and compiled code is done inline
31 // and bails out to Scavenge::invoke_and_allocate.
32
33 class CollectedHeap;
34 class DeferredObjAllocEvent;
35
36
37 // Common parts of a methodOop cache. This cache safely interacts with
38 // the RedefineClasses API.
39 //
40 class CommonMethodOopCache : public CHeapObj {
41 // We save the klassOop and the idnum of methodOop in order to get
42 // the current cached methodOop.
43 private:
44 klassOop _klass;
45 int _method_idnum;
46
47 public:
48 CommonMethodOopCache() { _klass = NULL; _method_idnum = -1; }
49 ~CommonMethodOopCache() { _klass = NULL; _method_idnum = -1; }
50
51 void init(klassOop k, methodOop m, TRAPS);
52 klassOop klass() const { return _klass; }
53 int method_idnum() const { return _method_idnum; }
54
55 // GC support
56 void oops_do(OopClosure* f) { f->do_oop((oop*)&_klass); }
57 };
58
59
60 // A helper class for caching a methodOop when the user of the cache
61 // cares about all versions of the methodOop.
62 //
63 class ActiveMethodOopsCache : public CommonMethodOopCache {
64 // This subclass adds weak references to older versions of the
65 // methodOop and a query method for a methodOop.
66
67 private:
68 // If the cached methodOop has not been redefined, then
69 // _prev_methods will be NULL. If all of the previous
70 // versions of the method have been collected, then
71 // _prev_methods can have a length of zero.
72 GrowableArray<jweak>* _prev_methods;
73
74 public:
75 ActiveMethodOopsCache() { _prev_methods = NULL; }
76 ~ActiveMethodOopsCache();
77
78 void add_previous_version(const methodOop method);
79 bool is_same_method(const methodOop method) const;
80 };
81
82
83 // A helper class for caching a methodOop when the user of the cache
84 // only cares about the latest version of the methodOop.
85 //
86 class LatestMethodOopCache : public CommonMethodOopCache {
87 // This subclass adds a getter method for the latest methodOop.
88
89 public:
90 methodOop get_methodOop();
91 };
92
93
94 class Universe: AllStatic {
95 friend class MarkSweep;
96 friend class oopDesc;
97 friend class ClassLoader;
98 friend class Arguments;
99 friend class SystemDictionary;
100 friend class VMStructs;
101 friend class CompactingPermGenGen;
102 friend class VM_PopulateDumpSharedSpace;
103
104 friend jint universe_init();
105 friend void universe2_init();
106 friend bool universe_post_init();
107
108 private:
109 // Known classes in the VM
110 static klassOop _boolArrayKlassObj;
111 static klassOop _byteArrayKlassObj;
112 static klassOop _charArrayKlassObj;
113 static klassOop _intArrayKlassObj;
114 static klassOop _shortArrayKlassObj;
115 static klassOop _longArrayKlassObj;
116 static klassOop _singleArrayKlassObj;
117 static klassOop _doubleArrayKlassObj;
118 static klassOop _typeArrayKlassObjs[T_VOID+1];
119
120 static klassOop _objectArrayKlassObj;
121
122 static klassOop _symbolKlassObj;
123 static klassOop _methodKlassObj;
124 static klassOop _constMethodKlassObj;
125 static klassOop _methodDataKlassObj;
126 static klassOop _klassKlassObj;
127 static klassOop _arrayKlassKlassObj;
128 static klassOop _objArrayKlassKlassObj;
129 static klassOop _typeArrayKlassKlassObj;
130 static klassOop _instanceKlassKlassObj;
131 static klassOop _constantPoolKlassObj;
132 static klassOop _constantPoolCacheKlassObj;
133 static klassOop _compiledICHolderKlassObj;
134 static klassOop _systemObjArrayKlassObj;
135
136 // Known objects in the VM
137
138 // Primitive objects
139 static oop _int_mirror;
140 static oop _float_mirror;
141 static oop _double_mirror;
142 static oop _byte_mirror;
143 static oop _bool_mirror;
144 static oop _char_mirror;
145 static oop _long_mirror;
146 static oop _short_mirror;
147 static oop _void_mirror;
148
149 static oop _main_thread_group; // Reference to the main thread group object
150 static oop _system_thread_group; // Reference to the system thread group object
151
152 static typeArrayOop _the_empty_byte_array; // Canonicalized byte array
153 static typeArrayOop _the_empty_short_array; // Canonicalized short array
154 static typeArrayOop _the_empty_int_array; // Canonicalized int array
155 static objArrayOop _the_empty_system_obj_array; // Canonicalized system obj array
156 static objArrayOop _the_empty_class_klass_array; // Canonicalized obj array of type java.lang.Class
157 static objArrayOop _the_array_interfaces_array; // Canonicalized 2-array of cloneable & serializable klasses
158 static LatestMethodOopCache* _finalizer_register_cache; // static method for registering finalizable objects
159 static LatestMethodOopCache* _loader_addClass_cache; // method for registering loaded classes in class loader vector
160 static ActiveMethodOopsCache* _reflect_invoke_cache; // method for security checks
161 static oop _out_of_memory_error_java_heap; // preallocated error object (no backtrace)
162 static oop _out_of_memory_error_perm_gen; // preallocated error object (no backtrace)
163 static oop _out_of_memory_error_array_size;// preallocated error object (no backtrace)
164 static oop _out_of_memory_error_gc_overhead_limit; // preallocated error object (no backtrace)
165
166 // array of preallocated error objects with backtrace
167 static objArrayOop _preallocated_out_of_memory_error_array;
168
169 // number of preallocated error objects available for use
170 static volatile jint _preallocated_out_of_memory_error_avail_count;
171
172 static oop _null_ptr_exception_instance; // preallocated exception object
173 static oop _arithmetic_exception_instance; // preallocated exception object
174 static oop _virtual_machine_error_instance; // preallocated exception object
175 // The object used as an exception dummy when exceptions are thrown for
176 // the vm thread.
177 static oop _vm_exception;
178
179 static oop _emptySymbol; // Canonical empty string ("") symbol
180
181 // The particular choice of collected heap.
182 static CollectedHeap* _collectedHeap;
183
184 // array of dummy objects used with +FullGCAlot
185 debug_only(static objArrayOop _fullgc_alot_dummy_array;)
186 // index of next entry to clear
187 debug_only(static int _fullgc_alot_dummy_next;)
188
189 // Compiler/dispatch support
190 static int _base_vtable_size; // Java vtbl size of klass Object (in words)
191
192 // Initialization
193 static bool _bootstrapping; // true during genesis
194 static bool _fully_initialized; // true after universe_init and initialize_vtables called
195
196 // the array of preallocated errors with backtraces
197 static objArrayOop preallocated_out_of_memory_errors() { return _preallocated_out_of_memory_error_array; }
198
199 // generate an out of memory error; if possible using an error with preallocated backtrace;
200 // otherwise return the given default error.
201 static oop gen_out_of_memory_error(oop default_err);
202
203 // Historic gc information
204 static size_t _heap_capacity_at_last_gc;
205 static size_t _heap_used_at_last_gc;
206
207 static jint initialize_heap();
208 static void initialize_basic_type_mirrors(TRAPS);
209 static void fixup_mirrors(TRAPS);
210
211 static void reinitialize_vtable_of(KlassHandle h_k, TRAPS);
212 static void reinitialize_itables(TRAPS);
213 static void compute_base_vtable_size(); // compute vtable size of class Object
214
215 static void genesis(TRAPS); // Create the initial world
216
217 // Mirrors for primitive classes (created eagerly)
218 static oop check_mirror(oop m) {
219 assert(m != NULL, "mirror not initialized");
220 return m;
221 }
222
223 // Debugging
224 static int _verify_count; // number of verifies done
225 // True during call to verify(). Should only be set/cleared in verify().
226 static bool _verify_in_progress;
227
228 static void compute_verify_oop_data();
229
230 public:
231 // Known classes in the VM
232 static klassOop boolArrayKlassObj() { return _boolArrayKlassObj; }
233 static klassOop byteArrayKlassObj() { return _byteArrayKlassObj; }
234 static klassOop charArrayKlassObj() { return _charArrayKlassObj; }
235 static klassOop intArrayKlassObj() { return _intArrayKlassObj; }
236 static klassOop shortArrayKlassObj() { return _shortArrayKlassObj; }
237 static klassOop longArrayKlassObj() { return _longArrayKlassObj; }
238 static klassOop singleArrayKlassObj() { return _singleArrayKlassObj; }
239 static klassOop doubleArrayKlassObj() { return _doubleArrayKlassObj; }
240
241 static klassOop objectArrayKlassObj() {
242 return _objectArrayKlassObj;
243 }
244
245 static klassOop typeArrayKlassObj(BasicType t) {
246 assert((uint)t < T_VOID+1, "range check");
247 assert(_typeArrayKlassObjs[t] != NULL, "domain check");
248 return _typeArrayKlassObjs[t];
249 }
250
251 static klassOop symbolKlassObj() { return _symbolKlassObj; }
252 static klassOop methodKlassObj() { return _methodKlassObj; }
253 static klassOop constMethodKlassObj() { return _constMethodKlassObj; }
254 static klassOop methodDataKlassObj() { return _methodDataKlassObj; }
255 static klassOop klassKlassObj() { return _klassKlassObj; }
256 static klassOop arrayKlassKlassObj() { return _arrayKlassKlassObj; }
257 static klassOop objArrayKlassKlassObj() { return _objArrayKlassKlassObj; }
258 static klassOop typeArrayKlassKlassObj() { return _typeArrayKlassKlassObj; }
259 static klassOop instanceKlassKlassObj() { return _instanceKlassKlassObj; }
260 static klassOop constantPoolKlassObj() { return _constantPoolKlassObj; }
261 static klassOop constantPoolCacheKlassObj() { return _constantPoolCacheKlassObj; }
262 static klassOop compiledICHolderKlassObj() { return _compiledICHolderKlassObj; }
263 static klassOop systemObjArrayKlassObj() { return _systemObjArrayKlassObj; }
264
265 // Known objects in tbe VM
266 static oop int_mirror() { return check_mirror(_int_mirror);
267 }
268 static oop float_mirror() { return check_mirror(_float_mirror); }
269 static oop double_mirror() { return check_mirror(_double_mirror); }
270 static oop byte_mirror() { return check_mirror(_byte_mirror); }
271 static oop bool_mirror() { return check_mirror(_bool_mirror); }
272 static oop char_mirror() { return check_mirror(_char_mirror); }
273 static oop long_mirror() { return check_mirror(_long_mirror); }
274 static oop short_mirror() { return check_mirror(_short_mirror); }
275 static oop void_mirror() { return check_mirror(_void_mirror); }
276
277 // table of same
278 static oop _mirrors[T_VOID+1];
279
280 static oop java_mirror(BasicType t) {
281 assert((uint)t < T_VOID+1, "range check");
282 return check_mirror(_mirrors[t]);
283 }
284 static oop main_thread_group() { return _main_thread_group; }
285 static void set_main_thread_group(oop group) { _main_thread_group = group;}
286
287 static oop system_thread_group() { return _system_thread_group; }
288 static void set_system_thread_group(oop group) { _system_thread_group = group;}
289
290 static typeArrayOop the_empty_byte_array() { return _the_empty_byte_array; }
291 static typeArrayOop the_empty_short_array() { return _the_empty_short_array; }
292 static typeArrayOop the_empty_int_array() { return _the_empty_int_array; }
293 static objArrayOop the_empty_system_obj_array () { return _the_empty_system_obj_array; }
294 static objArrayOop the_empty_class_klass_array () { return _the_empty_class_klass_array; }
295 static objArrayOop the_array_interfaces_array() { return _the_array_interfaces_array; }
296 static methodOop finalizer_register_method() { return _finalizer_register_cache->get_methodOop(); }
297 static methodOop loader_addClass_method() { return _loader_addClass_cache->get_methodOop(); }
298 static ActiveMethodOopsCache* reflect_invoke_cache() { return _reflect_invoke_cache; }
299 static oop null_ptr_exception_instance() { return _null_ptr_exception_instance; }
300 static oop arithmetic_exception_instance() { return _arithmetic_exception_instance; }
301 static oop virtual_machine_error_instance() { return _virtual_machine_error_instance; }
302 static oop vm_exception() { return _vm_exception; }
303 static oop emptySymbol() { return _emptySymbol; }
304
305 // OutOfMemoryError support. Returns an error with the required message. The returned error
306 // may or may not have a backtrace. If error has a backtrace then the stack trace is already
307 // filled in.
308 static oop out_of_memory_error_java_heap() { return gen_out_of_memory_error(_out_of_memory_error_java_heap); }
309 static oop out_of_memory_error_perm_gen() { return gen_out_of_memory_error(_out_of_memory_error_perm_gen); }
310 static oop out_of_memory_error_array_size() { return gen_out_of_memory_error(_out_of_memory_error_array_size); }
311 static oop out_of_memory_error_gc_overhead_limit() { return gen_out_of_memory_error(_out_of_memory_error_gc_overhead_limit); }
312
313 // Accessors needed for fast allocation
314 static klassOop* boolArrayKlassObj_addr() { return &_boolArrayKlassObj; }
315 static klassOop* byteArrayKlassObj_addr() { return &_byteArrayKlassObj; }
316 static klassOop* charArrayKlassObj_addr() { return &_charArrayKlassObj; }
317 static klassOop* intArrayKlassObj_addr() { return &_intArrayKlassObj; }
318 static klassOop* shortArrayKlassObj_addr() { return &_shortArrayKlassObj; }
319 static klassOop* longArrayKlassObj_addr() { return &_longArrayKlassObj; }
320 static klassOop* singleArrayKlassObj_addr() { return &_singleArrayKlassObj; }
321 static klassOop* doubleArrayKlassObj_addr() { return &_doubleArrayKlassObj; }
322
323 // The particular choice of collected heap.
324 static CollectedHeap* heap() { return _collectedHeap; }
325
326 // Historic gc information
327 static size_t get_heap_capacity_at_last_gc() { return _heap_capacity_at_last_gc; }
328 static size_t get_heap_free_at_last_gc() { return _heap_capacity_at_last_gc - _heap_used_at_last_gc; }
329 static size_t get_heap_used_at_last_gc() { return _heap_used_at_last_gc; }
330 static void update_heap_info_at_gc();
331
332 // Testers
333 static bool is_bootstrapping() { return _bootstrapping; }
334 static bool is_fully_initialized() { return _fully_initialized; }
335
336 static inline bool element_type_should_be_aligned(BasicType type);
337 static inline bool field_type_should_be_aligned(BasicType type);
338 static bool on_page_boundary(void* addr);
339 static bool should_fill_in_stack_trace(Handle throwable);
340 static void check_alignment(uintx size, uintx alignment, const char* name);
341
342 // Finalizer support.
343 static void run_finalizers_on_exit();
344
345 // Iteration
346
347 // Apply "f" to the addresses of all the direct heap pointers maintained
348 // as static fields of "Universe".
349 static void oops_do(OopClosure* f, bool do_all = false);
350
351 // Apply "f" to all klasses for basic types (classes not present in
352 // SystemDictionary).
353 static void basic_type_classes_do(void f(klassOop));
354
355 // Apply "f" to all system klasses (classes not present in SystemDictionary).
356 static void system_classes_do(void f(klassOop));
357
358 // For sharing -- fill in a list of known vtable pointers.
359 static void init_self_patching_vtbl_list(void** list, int count);
360
361 // Debugging
362 static bool verify_in_progress() { return _verify_in_progress; }
363 static void verify(bool allow_dirty = true, bool silent = false);
364 static int verify_count() { return _verify_count; }
365 static void print();
366 static void print_on(outputStream* st);
367 static void print_heap_at_SIGBREAK();
368 static void print_heap_before_gc() { print_heap_before_gc(gclog_or_tty); }
369 static void print_heap_after_gc() { print_heap_after_gc(gclog_or_tty); }
370 static void print_heap_before_gc(outputStream* st);
371 static void print_heap_after_gc(outputStream* st);
372
373 // Change the number of dummy objects kept reachable by the full gc dummy
374 // array; this should trigger relocation in a sliding compaction collector.
375 debug_only(static bool release_fullgc_alot_dummy();)
376 // The non-oop pattern (see compiledIC.hpp, etc)
377 static void* non_oop_word();
378
379 // Oop verification (see MacroAssembler::verify_oop)
380 static uintptr_t verify_oop_mask() PRODUCT_RETURN0;
381 static uintptr_t verify_oop_bits() PRODUCT_RETURN0;
382 static uintptr_t verify_mark_bits() PRODUCT_RETURN0;
383 static uintptr_t verify_mark_mask() PRODUCT_RETURN0;
384 static uintptr_t verify_klass_mask() PRODUCT_RETURN0;
385 static uintptr_t verify_klass_bits() PRODUCT_RETURN0;
386
387 // Flushing and deoptimization
388 static void flush_dependents_on(instanceKlassHandle dependee);
389 #ifdef HOTSWAP
390 // Flushing and deoptimization in case of evolution
391 static void flush_evol_dependents_on(instanceKlassHandle dependee);
392 #endif // HOTSWAP
393 // Support for fullspeed debugging
394 static void flush_dependents_on_method(methodHandle dependee);
395
396 // Compiler support
397 static int base_vtable_size() { return _base_vtable_size; }
398 };
399
400 class DeferredObjAllocEvent : public CHeapObj {
401 private:
402 oop _oop;
403 size_t _bytesize;
404 jint _arena_id;
405
406 public:
407 DeferredObjAllocEvent(const oop o, const size_t s, const jint id) {
408 _oop = o;
409 _bytesize = s;
410 _arena_id = id;
411 }
412
413 ~DeferredObjAllocEvent() {
414 }
415
416 jint arena_id() { return _arena_id; }
417 size_t bytesize() { return _bytesize; }
418 oop get_oop() { return _oop; }
419 };