Thu, 19 Mar 2009 09:13:24 -0700
Merge
1 /*
2 * Copyright 1997-2009 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 };
93 // For UseCompressedOops.
94 struct NarrowOopStruct {
95 // Base address for oop-within-java-object materialization.
96 // NULL if using wide oops or zero based narrow oops.
97 address _base;
98 // Number of shift bits for encoding/decoding narrow oops.
99 // 0 if using wide oops or zero based unscaled narrow oops,
100 // LogMinObjAlignmentInBytes otherwise.
101 int _shift;
102 // Generate code with implicit null checks for narrow oops.
103 bool _use_implicit_null_checks;
104 };
107 class Universe: AllStatic {
108 // Ugh. Universe is much too friendly.
109 friend class MarkSweep;
110 friend class oopDesc;
111 friend class ClassLoader;
112 friend class Arguments;
113 friend class SystemDictionary;
114 friend class VMStructs;
115 friend class CompactingPermGenGen;
116 friend class VM_PopulateDumpSharedSpace;
118 friend jint universe_init();
119 friend void universe2_init();
120 friend bool universe_post_init();
122 private:
123 // Known classes in the VM
124 static klassOop _boolArrayKlassObj;
125 static klassOop _byteArrayKlassObj;
126 static klassOop _charArrayKlassObj;
127 static klassOop _intArrayKlassObj;
128 static klassOop _shortArrayKlassObj;
129 static klassOop _longArrayKlassObj;
130 static klassOop _singleArrayKlassObj;
131 static klassOop _doubleArrayKlassObj;
132 static klassOop _typeArrayKlassObjs[T_VOID+1];
134 static klassOop _objectArrayKlassObj;
136 static klassOop _symbolKlassObj;
137 static klassOop _methodKlassObj;
138 static klassOop _constMethodKlassObj;
139 static klassOop _methodDataKlassObj;
140 static klassOop _klassKlassObj;
141 static klassOop _arrayKlassKlassObj;
142 static klassOop _objArrayKlassKlassObj;
143 static klassOop _typeArrayKlassKlassObj;
144 static klassOop _instanceKlassKlassObj;
145 static klassOop _constantPoolKlassObj;
146 static klassOop _constantPoolCacheKlassObj;
147 static klassOop _compiledICHolderKlassObj;
148 static klassOop _systemObjArrayKlassObj;
150 // Known objects in the VM
152 // Primitive objects
153 static oop _int_mirror;
154 static oop _float_mirror;
155 static oop _double_mirror;
156 static oop _byte_mirror;
157 static oop _bool_mirror;
158 static oop _char_mirror;
159 static oop _long_mirror;
160 static oop _short_mirror;
161 static oop _void_mirror;
163 static oop _main_thread_group; // Reference to the main thread group object
164 static oop _system_thread_group; // Reference to the system thread group object
166 static typeArrayOop _the_empty_byte_array; // Canonicalized byte array
167 static typeArrayOop _the_empty_short_array; // Canonicalized short array
168 static typeArrayOop _the_empty_int_array; // Canonicalized int array
169 static objArrayOop _the_empty_system_obj_array; // Canonicalized system obj array
170 static objArrayOop _the_empty_class_klass_array; // Canonicalized obj array of type java.lang.Class
171 static objArrayOop _the_array_interfaces_array; // Canonicalized 2-array of cloneable & serializable klasses
172 static LatestMethodOopCache* _finalizer_register_cache; // static method for registering finalizable objects
173 static LatestMethodOopCache* _loader_addClass_cache; // method for registering loaded classes in class loader vector
174 static ActiveMethodOopsCache* _reflect_invoke_cache; // method for security checks
175 static oop _out_of_memory_error_java_heap; // preallocated error object (no backtrace)
176 static oop _out_of_memory_error_perm_gen; // preallocated error object (no backtrace)
177 static oop _out_of_memory_error_array_size;// preallocated error object (no backtrace)
178 static oop _out_of_memory_error_gc_overhead_limit; // preallocated error object (no backtrace)
180 // array of preallocated error objects with backtrace
181 static objArrayOop _preallocated_out_of_memory_error_array;
183 // number of preallocated error objects available for use
184 static volatile jint _preallocated_out_of_memory_error_avail_count;
186 static oop _null_ptr_exception_instance; // preallocated exception object
187 static oop _arithmetic_exception_instance; // preallocated exception object
188 static oop _virtual_machine_error_instance; // preallocated exception object
189 // The object used as an exception dummy when exceptions are thrown for
190 // the vm thread.
191 static oop _vm_exception;
193 static oop _emptySymbol; // Canonical empty string ("") symbol
195 // The particular choice of collected heap.
196 static CollectedHeap* _collectedHeap;
198 // For UseCompressedOops.
199 static struct NarrowOopStruct _narrow_oop;
201 // array of dummy objects used with +FullGCAlot
202 debug_only(static objArrayOop _fullgc_alot_dummy_array;)
203 // index of next entry to clear
204 debug_only(static int _fullgc_alot_dummy_next;)
206 // Compiler/dispatch support
207 static int _base_vtable_size; // Java vtbl size of klass Object (in words)
209 // Initialization
210 static bool _bootstrapping; // true during genesis
211 static bool _fully_initialized; // true after universe_init and initialize_vtables called
213 // the array of preallocated errors with backtraces
214 static objArrayOop preallocated_out_of_memory_errors() { return _preallocated_out_of_memory_error_array; }
216 // generate an out of memory error; if possible using an error with preallocated backtrace;
217 // otherwise return the given default error.
218 static oop gen_out_of_memory_error(oop default_err);
220 // Historic gc information
221 static size_t _heap_capacity_at_last_gc;
222 static size_t _heap_used_at_last_gc;
224 static jint initialize_heap();
225 static void initialize_basic_type_mirrors(TRAPS);
226 static void fixup_mirrors(TRAPS);
228 static void reinitialize_vtable_of(KlassHandle h_k, TRAPS);
229 static void reinitialize_itables(TRAPS);
230 static void compute_base_vtable_size(); // compute vtable size of class Object
232 static void genesis(TRAPS); // Create the initial world
234 // Mirrors for primitive classes (created eagerly)
235 static oop check_mirror(oop m) {
236 assert(m != NULL, "mirror not initialized");
237 return m;
238 }
240 // Debugging
241 static int _verify_count; // number of verifies done
242 // True during call to verify(). Should only be set/cleared in verify().
243 static bool _verify_in_progress;
245 static void compute_verify_oop_data();
247 public:
248 // Known classes in the VM
249 static klassOop boolArrayKlassObj() { return _boolArrayKlassObj; }
250 static klassOop byteArrayKlassObj() { return _byteArrayKlassObj; }
251 static klassOop charArrayKlassObj() { return _charArrayKlassObj; }
252 static klassOop intArrayKlassObj() { return _intArrayKlassObj; }
253 static klassOop shortArrayKlassObj() { return _shortArrayKlassObj; }
254 static klassOop longArrayKlassObj() { return _longArrayKlassObj; }
255 static klassOop singleArrayKlassObj() { return _singleArrayKlassObj; }
256 static klassOop doubleArrayKlassObj() { return _doubleArrayKlassObj; }
258 static klassOop objectArrayKlassObj() {
259 return _objectArrayKlassObj;
260 }
262 static klassOop typeArrayKlassObj(BasicType t) {
263 assert((uint)t < T_VOID+1, "range check");
264 assert(_typeArrayKlassObjs[t] != NULL, "domain check");
265 return _typeArrayKlassObjs[t];
266 }
268 static klassOop symbolKlassObj() { return _symbolKlassObj; }
269 static klassOop methodKlassObj() { return _methodKlassObj; }
270 static klassOop constMethodKlassObj() { return _constMethodKlassObj; }
271 static klassOop methodDataKlassObj() { return _methodDataKlassObj; }
272 static klassOop klassKlassObj() { return _klassKlassObj; }
273 static klassOop arrayKlassKlassObj() { return _arrayKlassKlassObj; }
274 static klassOop objArrayKlassKlassObj() { return _objArrayKlassKlassObj; }
275 static klassOop typeArrayKlassKlassObj() { return _typeArrayKlassKlassObj; }
276 static klassOop instanceKlassKlassObj() { return _instanceKlassKlassObj; }
277 static klassOop constantPoolKlassObj() { return _constantPoolKlassObj; }
278 static klassOop constantPoolCacheKlassObj() { return _constantPoolCacheKlassObj; }
279 static klassOop compiledICHolderKlassObj() { return _compiledICHolderKlassObj; }
280 static klassOop systemObjArrayKlassObj() { return _systemObjArrayKlassObj; }
282 // Known objects in tbe VM
283 static oop int_mirror() { return check_mirror(_int_mirror);
284 }
285 static oop float_mirror() { return check_mirror(_float_mirror); }
286 static oop double_mirror() { return check_mirror(_double_mirror); }
287 static oop byte_mirror() { return check_mirror(_byte_mirror); }
288 static oop bool_mirror() { return check_mirror(_bool_mirror); }
289 static oop char_mirror() { return check_mirror(_char_mirror); }
290 static oop long_mirror() { return check_mirror(_long_mirror); }
291 static oop short_mirror() { return check_mirror(_short_mirror); }
292 static oop void_mirror() { return check_mirror(_void_mirror); }
294 // table of same
295 static oop _mirrors[T_VOID+1];
297 static oop java_mirror(BasicType t) {
298 assert((uint)t < T_VOID+1, "range check");
299 return check_mirror(_mirrors[t]);
300 }
301 static oop main_thread_group() { return _main_thread_group; }
302 static void set_main_thread_group(oop group) { _main_thread_group = group;}
304 static oop system_thread_group() { return _system_thread_group; }
305 static void set_system_thread_group(oop group) { _system_thread_group = group;}
307 static typeArrayOop the_empty_byte_array() { return _the_empty_byte_array; }
308 static typeArrayOop the_empty_short_array() { return _the_empty_short_array; }
309 static typeArrayOop the_empty_int_array() { return _the_empty_int_array; }
310 static objArrayOop the_empty_system_obj_array () { return _the_empty_system_obj_array; }
311 static objArrayOop the_empty_class_klass_array () { return _the_empty_class_klass_array; }
312 static objArrayOop the_array_interfaces_array() { return _the_array_interfaces_array; }
313 static methodOop finalizer_register_method() { return _finalizer_register_cache->get_methodOop(); }
314 static methodOop loader_addClass_method() { return _loader_addClass_cache->get_methodOop(); }
315 static ActiveMethodOopsCache* reflect_invoke_cache() { return _reflect_invoke_cache; }
316 static oop null_ptr_exception_instance() { return _null_ptr_exception_instance; }
317 static oop arithmetic_exception_instance() { return _arithmetic_exception_instance; }
318 static oop virtual_machine_error_instance() { return _virtual_machine_error_instance; }
319 static oop vm_exception() { return _vm_exception; }
320 static oop emptySymbol() { return _emptySymbol; }
322 // OutOfMemoryError support. Returns an error with the required message. The returned error
323 // may or may not have a backtrace. If error has a backtrace then the stack trace is already
324 // filled in.
325 static oop out_of_memory_error_java_heap() { return gen_out_of_memory_error(_out_of_memory_error_java_heap); }
326 static oop out_of_memory_error_perm_gen() { return gen_out_of_memory_error(_out_of_memory_error_perm_gen); }
327 static oop out_of_memory_error_array_size() { return gen_out_of_memory_error(_out_of_memory_error_array_size); }
328 static oop out_of_memory_error_gc_overhead_limit() { return gen_out_of_memory_error(_out_of_memory_error_gc_overhead_limit); }
330 // Accessors needed for fast allocation
331 static klassOop* boolArrayKlassObj_addr() { return &_boolArrayKlassObj; }
332 static klassOop* byteArrayKlassObj_addr() { return &_byteArrayKlassObj; }
333 static klassOop* charArrayKlassObj_addr() { return &_charArrayKlassObj; }
334 static klassOop* intArrayKlassObj_addr() { return &_intArrayKlassObj; }
335 static klassOop* shortArrayKlassObj_addr() { return &_shortArrayKlassObj; }
336 static klassOop* longArrayKlassObj_addr() { return &_longArrayKlassObj; }
337 static klassOop* singleArrayKlassObj_addr() { return &_singleArrayKlassObj; }
338 static klassOop* doubleArrayKlassObj_addr() { return &_doubleArrayKlassObj; }
340 // The particular choice of collected heap.
341 static CollectedHeap* heap() { return _collectedHeap; }
343 // For UseCompressedOops
344 static address* narrow_oop_base_addr() { return &_narrow_oop._base; }
345 static address narrow_oop_base() { return _narrow_oop._base; }
346 static int narrow_oop_shift() { return _narrow_oop._shift; }
347 static void set_narrow_oop_base(address base) { _narrow_oop._base = base; }
348 static void set_narrow_oop_shift(int shift) { _narrow_oop._shift = shift; }
349 static bool narrow_oop_use_implicit_null_checks() { return _narrow_oop._use_implicit_null_checks; }
350 static void set_narrow_oop_use_implicit_null_checks(bool use) { _narrow_oop._use_implicit_null_checks = use; }
351 // Narrow Oop encoding mode:
352 // 0 - Use 32-bits oops without encoding when
353 // NarrowOopHeapBaseMin + heap_size < 4Gb
354 // 1 - Use zero based compressed oops with encoding when
355 // NarrowOopHeapBaseMin + heap_size < 32Gb
356 // 2 - Use compressed oops with heap base + encoding.
357 enum NARROW_OOP_MODE {
358 UnscaledNarrowOop = 0,
359 ZeroBasedNarrowOop = 1,
360 HeapBasedNarrowOop = 2
361 };
362 static char* preferred_heap_base(size_t heap_size, NARROW_OOP_MODE mode);
364 // Historic gc information
365 static size_t get_heap_capacity_at_last_gc() { return _heap_capacity_at_last_gc; }
366 static size_t get_heap_free_at_last_gc() { return _heap_capacity_at_last_gc - _heap_used_at_last_gc; }
367 static size_t get_heap_used_at_last_gc() { return _heap_used_at_last_gc; }
368 static void update_heap_info_at_gc();
370 // Testers
371 static bool is_bootstrapping() { return _bootstrapping; }
372 static bool is_fully_initialized() { return _fully_initialized; }
374 static inline bool element_type_should_be_aligned(BasicType type);
375 static inline bool field_type_should_be_aligned(BasicType type);
376 static bool on_page_boundary(void* addr);
377 static bool should_fill_in_stack_trace(Handle throwable);
378 static void check_alignment(uintx size, uintx alignment, const char* name);
380 // Finalizer support.
381 static void run_finalizers_on_exit();
383 // Iteration
385 // Apply "f" to the addresses of all the direct heap pointers maintained
386 // as static fields of "Universe".
387 static void oops_do(OopClosure* f, bool do_all = false);
389 // Apply "f" to all klasses for basic types (classes not present in
390 // SystemDictionary).
391 static void basic_type_classes_do(void f(klassOop));
393 // Apply "f" to all system klasses (classes not present in SystemDictionary).
394 static void system_classes_do(void f(klassOop));
396 // For sharing -- fill in a list of known vtable pointers.
397 static void init_self_patching_vtbl_list(void** list, int count);
399 // Debugging
400 static bool verify_in_progress() { return _verify_in_progress; }
401 static void verify(bool allow_dirty = true, bool silent = false);
402 static int verify_count() { return _verify_count; }
403 static void print();
404 static void print_on(outputStream* st);
405 static void print_heap_at_SIGBREAK();
406 static void print_heap_before_gc() { print_heap_before_gc(gclog_or_tty); }
407 static void print_heap_after_gc() { print_heap_after_gc(gclog_or_tty); }
408 static void print_heap_before_gc(outputStream* st);
409 static void print_heap_after_gc(outputStream* st);
411 // Change the number of dummy objects kept reachable by the full gc dummy
412 // array; this should trigger relocation in a sliding compaction collector.
413 debug_only(static bool release_fullgc_alot_dummy();)
414 // The non-oop pattern (see compiledIC.hpp, etc)
415 static void* non_oop_word();
417 // Oop verification (see MacroAssembler::verify_oop)
418 static uintptr_t verify_oop_mask() PRODUCT_RETURN0;
419 static uintptr_t verify_oop_bits() PRODUCT_RETURN0;
420 static uintptr_t verify_mark_bits() PRODUCT_RETURN0;
421 static uintptr_t verify_mark_mask() PRODUCT_RETURN0;
422 static uintptr_t verify_klass_mask() PRODUCT_RETURN0;
423 static uintptr_t verify_klass_bits() PRODUCT_RETURN0;
425 // Flushing and deoptimization
426 static void flush_dependents_on(instanceKlassHandle dependee);
427 #ifdef HOTSWAP
428 // Flushing and deoptimization in case of evolution
429 static void flush_evol_dependents_on(instanceKlassHandle dependee);
430 #endif // HOTSWAP
431 // Support for fullspeed debugging
432 static void flush_dependents_on_method(methodHandle dependee);
434 // Compiler support
435 static int base_vtable_size() { return _base_vtable_size; }
436 };
438 class DeferredObjAllocEvent : public CHeapObj {
439 private:
440 oop _oop;
441 size_t _bytesize;
442 jint _arena_id;
444 public:
445 DeferredObjAllocEvent(const oop o, const size_t s, const jint id) {
446 _oop = o;
447 _bytesize = s;
448 _arena_id = id;
449 }
451 ~DeferredObjAllocEvent() {
452 }
454 jint arena_id() { return _arena_id; }
455 size_t bytesize() { return _bytesize; }
456 oop get_oop() { return _oop; }
457 };