Thu, 12 Jun 2008 13:50:55 -0700
Merge
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 */
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.
33 class CollectedHeap;
34 class DeferredObjAllocEvent;
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;
47 public:
48 CommonMethodOopCache() { _klass = NULL; _method_idnum = -1; }
49 ~CommonMethodOopCache() { _klass = NULL; _method_idnum = -1; }
51 void init(klassOop k, methodOop m, TRAPS);
52 klassOop klass() const { return _klass; }
53 int method_idnum() const { return _method_idnum; }
55 // GC support
56 void oops_do(OopClosure* f) { f->do_oop((oop*)&_klass); }
57 };
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.
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;
74 public:
75 ActiveMethodOopsCache() { _prev_methods = NULL; }
76 ~ActiveMethodOopsCache();
78 void add_previous_version(const methodOop method);
79 bool is_same_method(const methodOop method) const;
80 };
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.
89 public:
90 methodOop get_methodOop();
91 };
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;
104 friend jint universe_init();
105 friend void universe2_init();
106 friend bool universe_post_init();
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];
120 static klassOop _objectArrayKlassObj;
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;
136 // Known objects in the VM
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;
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
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)
166 // array of preallocated error objects with backtrace
167 static objArrayOop _preallocated_out_of_memory_error_array;
169 // number of preallocated error objects available for use
170 static volatile jint _preallocated_out_of_memory_error_avail_count;
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;
179 static oop _emptySymbol; // Canonical empty string ("") symbol
181 // The particular choice of collected heap.
182 static CollectedHeap* _collectedHeap;
183 // Base address for oop-within-java-object materialization.
184 // NULL if using wide oops. Doubles as heap oop null value.
185 static address _heap_base;
187 // array of dummy objects used with +FullGCAlot
188 debug_only(static objArrayOop _fullgc_alot_dummy_array;)
189 // index of next entry to clear
190 debug_only(static int _fullgc_alot_dummy_next;)
192 // Compiler/dispatch support
193 static int _base_vtable_size; // Java vtbl size of klass Object (in words)
195 // Initialization
196 static bool _bootstrapping; // true during genesis
197 static bool _fully_initialized; // true after universe_init and initialize_vtables called
199 // the array of preallocated errors with backtraces
200 static objArrayOop preallocated_out_of_memory_errors() { return _preallocated_out_of_memory_error_array; }
202 // generate an out of memory error; if possible using an error with preallocated backtrace;
203 // otherwise return the given default error.
204 static oop gen_out_of_memory_error(oop default_err);
206 // Historic gc information
207 static size_t _heap_capacity_at_last_gc;
208 static size_t _heap_used_at_last_gc;
210 static jint initialize_heap();
211 static void initialize_basic_type_mirrors(TRAPS);
212 static void fixup_mirrors(TRAPS);
214 static void reinitialize_vtable_of(KlassHandle h_k, TRAPS);
215 static void reinitialize_itables(TRAPS);
216 static void compute_base_vtable_size(); // compute vtable size of class Object
218 static void genesis(TRAPS); // Create the initial world
220 // Mirrors for primitive classes (created eagerly)
221 static oop check_mirror(oop m) {
222 assert(m != NULL, "mirror not initialized");
223 return m;
224 }
226 // Debugging
227 static int _verify_count; // number of verifies done
228 // True during call to verify(). Should only be set/cleared in verify().
229 static bool _verify_in_progress;
231 static void compute_verify_oop_data();
233 public:
234 // Known classes in the VM
235 static klassOop boolArrayKlassObj() { return _boolArrayKlassObj; }
236 static klassOop byteArrayKlassObj() { return _byteArrayKlassObj; }
237 static klassOop charArrayKlassObj() { return _charArrayKlassObj; }
238 static klassOop intArrayKlassObj() { return _intArrayKlassObj; }
239 static klassOop shortArrayKlassObj() { return _shortArrayKlassObj; }
240 static klassOop longArrayKlassObj() { return _longArrayKlassObj; }
241 static klassOop singleArrayKlassObj() { return _singleArrayKlassObj; }
242 static klassOop doubleArrayKlassObj() { return _doubleArrayKlassObj; }
244 static klassOop objectArrayKlassObj() {
245 return _objectArrayKlassObj;
246 }
248 static klassOop typeArrayKlassObj(BasicType t) {
249 assert((uint)t < T_VOID+1, "range check");
250 assert(_typeArrayKlassObjs[t] != NULL, "domain check");
251 return _typeArrayKlassObjs[t];
252 }
254 static klassOop symbolKlassObj() { return _symbolKlassObj; }
255 static klassOop methodKlassObj() { return _methodKlassObj; }
256 static klassOop constMethodKlassObj() { return _constMethodKlassObj; }
257 static klassOop methodDataKlassObj() { return _methodDataKlassObj; }
258 static klassOop klassKlassObj() { return _klassKlassObj; }
259 static klassOop arrayKlassKlassObj() { return _arrayKlassKlassObj; }
260 static klassOop objArrayKlassKlassObj() { return _objArrayKlassKlassObj; }
261 static klassOop typeArrayKlassKlassObj() { return _typeArrayKlassKlassObj; }
262 static klassOop instanceKlassKlassObj() { return _instanceKlassKlassObj; }
263 static klassOop constantPoolKlassObj() { return _constantPoolKlassObj; }
264 static klassOop constantPoolCacheKlassObj() { return _constantPoolCacheKlassObj; }
265 static klassOop compiledICHolderKlassObj() { return _compiledICHolderKlassObj; }
266 static klassOop systemObjArrayKlassObj() { return _systemObjArrayKlassObj; }
268 // Known objects in tbe VM
269 static oop int_mirror() { return check_mirror(_int_mirror);
270 }
271 static oop float_mirror() { return check_mirror(_float_mirror); }
272 static oop double_mirror() { return check_mirror(_double_mirror); }
273 static oop byte_mirror() { return check_mirror(_byte_mirror); }
274 static oop bool_mirror() { return check_mirror(_bool_mirror); }
275 static oop char_mirror() { return check_mirror(_char_mirror); }
276 static oop long_mirror() { return check_mirror(_long_mirror); }
277 static oop short_mirror() { return check_mirror(_short_mirror); }
278 static oop void_mirror() { return check_mirror(_void_mirror); }
280 // table of same
281 static oop _mirrors[T_VOID+1];
283 static oop java_mirror(BasicType t) {
284 assert((uint)t < T_VOID+1, "range check");
285 return check_mirror(_mirrors[t]);
286 }
287 static oop main_thread_group() { return _main_thread_group; }
288 static void set_main_thread_group(oop group) { _main_thread_group = group;}
290 static oop system_thread_group() { return _system_thread_group; }
291 static void set_system_thread_group(oop group) { _system_thread_group = group;}
293 static typeArrayOop the_empty_byte_array() { return _the_empty_byte_array; }
294 static typeArrayOop the_empty_short_array() { return _the_empty_short_array; }
295 static typeArrayOop the_empty_int_array() { return _the_empty_int_array; }
296 static objArrayOop the_empty_system_obj_array () { return _the_empty_system_obj_array; }
297 static objArrayOop the_empty_class_klass_array () { return _the_empty_class_klass_array; }
298 static objArrayOop the_array_interfaces_array() { return _the_array_interfaces_array; }
299 static methodOop finalizer_register_method() { return _finalizer_register_cache->get_methodOop(); }
300 static methodOop loader_addClass_method() { return _loader_addClass_cache->get_methodOop(); }
301 static ActiveMethodOopsCache* reflect_invoke_cache() { return _reflect_invoke_cache; }
302 static oop null_ptr_exception_instance() { return _null_ptr_exception_instance; }
303 static oop arithmetic_exception_instance() { return _arithmetic_exception_instance; }
304 static oop virtual_machine_error_instance() { return _virtual_machine_error_instance; }
305 static oop vm_exception() { return _vm_exception; }
306 static oop emptySymbol() { return _emptySymbol; }
308 // OutOfMemoryError support. Returns an error with the required message. The returned error
309 // may or may not have a backtrace. If error has a backtrace then the stack trace is already
310 // filled in.
311 static oop out_of_memory_error_java_heap() { return gen_out_of_memory_error(_out_of_memory_error_java_heap); }
312 static oop out_of_memory_error_perm_gen() { return gen_out_of_memory_error(_out_of_memory_error_perm_gen); }
313 static oop out_of_memory_error_array_size() { return gen_out_of_memory_error(_out_of_memory_error_array_size); }
314 static oop out_of_memory_error_gc_overhead_limit() { return gen_out_of_memory_error(_out_of_memory_error_gc_overhead_limit); }
316 // Accessors needed for fast allocation
317 static klassOop* boolArrayKlassObj_addr() { return &_boolArrayKlassObj; }
318 static klassOop* byteArrayKlassObj_addr() { return &_byteArrayKlassObj; }
319 static klassOop* charArrayKlassObj_addr() { return &_charArrayKlassObj; }
320 static klassOop* intArrayKlassObj_addr() { return &_intArrayKlassObj; }
321 static klassOop* shortArrayKlassObj_addr() { return &_shortArrayKlassObj; }
322 static klassOop* longArrayKlassObj_addr() { return &_longArrayKlassObj; }
323 static klassOop* singleArrayKlassObj_addr() { return &_singleArrayKlassObj; }
324 static klassOop* doubleArrayKlassObj_addr() { return &_doubleArrayKlassObj; }
326 // The particular choice of collected heap.
327 static CollectedHeap* heap() { return _collectedHeap; }
329 // For UseCompressedOops
330 static address heap_base() { return _heap_base; }
331 static address* heap_base_addr() { return &_heap_base; }
333 // Historic gc information
334 static size_t get_heap_capacity_at_last_gc() { return _heap_capacity_at_last_gc; }
335 static size_t get_heap_free_at_last_gc() { return _heap_capacity_at_last_gc - _heap_used_at_last_gc; }
336 static size_t get_heap_used_at_last_gc() { return _heap_used_at_last_gc; }
337 static void update_heap_info_at_gc();
339 // Testers
340 static bool is_bootstrapping() { return _bootstrapping; }
341 static bool is_fully_initialized() { return _fully_initialized; }
343 static inline bool element_type_should_be_aligned(BasicType type);
344 static inline bool field_type_should_be_aligned(BasicType type);
345 static bool on_page_boundary(void* addr);
346 static bool should_fill_in_stack_trace(Handle throwable);
347 static void check_alignment(uintx size, uintx alignment, const char* name);
349 // Finalizer support.
350 static void run_finalizers_on_exit();
352 // Iteration
354 // Apply "f" to the addresses of all the direct heap pointers maintained
355 // as static fields of "Universe".
356 static void oops_do(OopClosure* f, bool do_all = false);
358 // Apply "f" to all klasses for basic types (classes not present in
359 // SystemDictionary).
360 static void basic_type_classes_do(void f(klassOop));
362 // Apply "f" to all system klasses (classes not present in SystemDictionary).
363 static void system_classes_do(void f(klassOop));
365 // For sharing -- fill in a list of known vtable pointers.
366 static void init_self_patching_vtbl_list(void** list, int count);
368 // Debugging
369 static bool verify_in_progress() { return _verify_in_progress; }
370 static void verify(bool allow_dirty = true, bool silent = false);
371 static int verify_count() { return _verify_count; }
372 static void print();
373 static void print_on(outputStream* st);
374 static void print_heap_at_SIGBREAK();
375 static void print_heap_before_gc() { print_heap_before_gc(gclog_or_tty); }
376 static void print_heap_after_gc() { print_heap_after_gc(gclog_or_tty); }
377 static void print_heap_before_gc(outputStream* st);
378 static void print_heap_after_gc(outputStream* st);
380 // Change the number of dummy objects kept reachable by the full gc dummy
381 // array; this should trigger relocation in a sliding compaction collector.
382 debug_only(static bool release_fullgc_alot_dummy();)
383 // The non-oop pattern (see compiledIC.hpp, etc)
384 static void* non_oop_word();
386 // Oop verification (see MacroAssembler::verify_oop)
387 static uintptr_t verify_oop_mask() PRODUCT_RETURN0;
388 static uintptr_t verify_oop_bits() PRODUCT_RETURN0;
389 static uintptr_t verify_mark_bits() PRODUCT_RETURN0;
390 static uintptr_t verify_mark_mask() PRODUCT_RETURN0;
391 static uintptr_t verify_klass_mask() PRODUCT_RETURN0;
392 static uintptr_t verify_klass_bits() PRODUCT_RETURN0;
394 // Flushing and deoptimization
395 static void flush_dependents_on(instanceKlassHandle dependee);
396 #ifdef HOTSWAP
397 // Flushing and deoptimization in case of evolution
398 static void flush_evol_dependents_on(instanceKlassHandle dependee);
399 #endif // HOTSWAP
400 // Support for fullspeed debugging
401 static void flush_dependents_on_method(methodHandle dependee);
403 // Compiler support
404 static int base_vtable_size() { return _base_vtable_size; }
405 };
407 class DeferredObjAllocEvent : public CHeapObj {
408 private:
409 oop _oop;
410 size_t _bytesize;
411 jint _arena_id;
413 public:
414 DeferredObjAllocEvent(const oop o, const size_t s, const jint id) {
415 _oop = o;
416 _bytesize = s;
417 _arena_id = id;
418 }
420 ~DeferredObjAllocEvent() {
421 }
423 jint arena_id() { return _arena_id; }
424 size_t bytesize() { return _bytesize; }
425 oop get_oop() { return _oop; }
426 };