1 /*
2 * Copyright (c) 1997, 2018, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_VM_MEMORY_UNIVERSE_HPP
26 #define SHARE_VM_MEMORY_UNIVERSE_HPP
27
28 #include "oops/array.hpp"
29 #include "runtime/handles.hpp"
30 #include "utilities/growableArray.hpp"
31
32 // Universe is a name space holding known system classes and objects in the VM.
33 //
34 // Loaded classes are accessible through the SystemDictionary.
35 //
36 // The object heap is allocated and accessed through Universe, and various allocation
37 // support is provided. Allocation by the interpreter and compiled code is done inline
38 // and bails out to Scavenge::invoke_and_allocate.
39
40 class CollectedHeap;
41 class DeferredObjAllocEvent;
42 class OopStorage;
43
44
45 // A helper class for caching a Method* when the user of the cache
46 // only cares about the latest version of the Method*. This cache safely
47 // interacts with the RedefineClasses API.
48
49 class LatestMethodCache : public CHeapObj<mtClass> {
50 // We save the Klass* and the idnum of Method* in order to get
51 // the current cached Method*.
52 private:
53 Klass* _klass;
54 int _method_idnum;
55
56 public:
57 LatestMethodCache() { _klass = NULL; _method_idnum = -1; }
58 ~LatestMethodCache() { _klass = NULL; _method_idnum = -1; }
59
60 void init(Klass* k, Method* m);
61 Klass* klass() const { return _klass; }
62 int method_idnum() const { return _method_idnum; }
63
64 Method* get_method();
65
66 // CDS support. Replace the klass in this with the archive version
67 // could use this for Enhanced Class Redefinition also.
68 void serialize(SerializeClosure* f) {
69 f->do_ptr((void**)&_klass);
70 }
71 void metaspace_pointers_do(MetaspaceClosure* it);
72 };
73
74
75 // For UseCompressedOops.
76 struct NarrowPtrStruct {
77 // Base address for oop-within-java-object materialization.
78 // NULL if using wide oops or zero based narrow oops.
79 address _base;
80 // Number of shift bits for encoding/decoding narrow ptrs.
81 // 0 if using wide ptrs or zero based unscaled narrow ptrs,
82 // LogMinObjAlignmentInBytes/LogKlassAlignmentInBytes otherwise.
83 int _shift;
84 // Generate code with implicit null checks for narrow ptrs.
85 bool _use_implicit_null_checks;
86 };
87
88 enum VerifyOption {
89 VerifyOption_Default = 0,
90
91 // G1
92 VerifyOption_G1UsePrevMarking = VerifyOption_Default,
93 VerifyOption_G1UseNextMarking = VerifyOption_G1UsePrevMarking + 1,
94 VerifyOption_G1UseFullMarking = VerifyOption_G1UseNextMarking + 1
95 };
96
97 class Universe: AllStatic {
98 // Ugh. Universe is much too friendly.
99 friend class MarkSweep;
100 friend class oopDesc;
101 friend class ClassLoader;
102 friend class SystemDictionary;
103 friend class ReservedHeapSpace;
104 friend class VMStructs;
105 friend class VM_PopulateDumpSharedSpace;
106 friend class Metaspace;
107 friend class MetaspaceShared;
108
109 friend jint universe_init();
110 friend void universe2_init();
111 friend bool universe_post_init();
112 friend void universe_post_module_init();
113
114 private:
115 // Known classes in the VM
116 static Klass* _boolArrayKlassObj;
117 static Klass* _byteArrayKlassObj;
118 static Klass* _charArrayKlassObj;
119 static Klass* _intArrayKlassObj;
120 static Klass* _shortArrayKlassObj;
121 static Klass* _longArrayKlassObj;
122 static Klass* _singleArrayKlassObj;
123 static Klass* _doubleArrayKlassObj;
124 static Klass* _typeArrayKlassObjs[T_VOID+1];
125
126 static Klass* _objectArrayKlassObj;
127
128 // VM weak OopStorage object.
129 static OopStorage* _vm_weak_oop_storage;
130
131 // Known objects in the VM
132
133 // Primitive objects
134 static oop _int_mirror;
135 static oop _float_mirror;
136 static oop _double_mirror;
137 static oop _byte_mirror;
138 static oop _bool_mirror;
139 static oop _char_mirror;
140 static oop _long_mirror;
141 static oop _short_mirror;
142 static oop _void_mirror;
143
144 static oop _main_thread_group; // Reference to the main thread group object
145 static oop _system_thread_group; // Reference to the system thread group object
146
147 static objArrayOop _the_empty_class_klass_array; // Canonicalized obj array of type java.lang.Class
148 static oop _the_null_sentinel; // A unique object pointer unused except as a sentinel for null.
149 static oop _the_null_string; // A cache of "null" as a Java string
150 static oop _the_min_jint_string; // A cache of "-2147483648" as a Java string
151 static LatestMethodCache* _finalizer_register_cache; // static method for registering finalizable objects
152 static LatestMethodCache* _loader_addClass_cache; // method for registering loaded classes in class loader vector
153 static LatestMethodCache* _pd_implies_cache; // method for checking protection domain attributes
154 static LatestMethodCache* _throw_illegal_access_error_cache; // Unsafe.throwIllegalAccessError() method
155 static LatestMethodCache* _do_stack_walk_cache; // method for stack walker callback
156
157 // preallocated error objects (no backtrace)
158 static oop _out_of_memory_error_java_heap;
159 static oop _out_of_memory_error_metaspace;
160 static oop _out_of_memory_error_class_metaspace;
161 static oop _out_of_memory_error_array_size;
162 static oop _out_of_memory_error_gc_overhead_limit;
163 static oop _out_of_memory_error_realloc_objects;
164
165 // preallocated cause message for delayed StackOverflowError
166 static oop _delayed_stack_overflow_error_message;
167
168 static Array<int>* _the_empty_int_array; // Canonicalized int array
169 static Array<u2>* _the_empty_short_array; // Canonicalized short array
170 static Array<Klass*>* _the_empty_klass_array; // Canonicalized klass obj array
171 static Array<Method*>* _the_empty_method_array; // Canonicalized method obj array
172
173 static Array<Klass*>* _the_array_interfaces_array;
174
175 // array of preallocated error objects with backtrace
176 static objArrayOop _preallocated_out_of_memory_error_array;
177
178 // number of preallocated error objects available for use
179 static volatile jint _preallocated_out_of_memory_error_avail_count;
180
181 static oop _null_ptr_exception_instance; // preallocated exception object
182 static oop _arithmetic_exception_instance; // preallocated exception object
183 static oop _virtual_machine_error_instance; // preallocated exception object
184 // The object used as an exception dummy when exceptions are thrown for
185 // the vm thread.
186 static oop _vm_exception;
187
188 // References waiting to be transferred to the ReferenceHandler
189 static oop _reference_pending_list;
190
191 // The particular choice of collected heap.
192 static CollectedHeap* _collectedHeap;
193
194 static intptr_t _non_oop_bits;
195
196 // For UseCompressedOops.
197 static struct NarrowPtrStruct _narrow_oop;
198 // For UseCompressedClassPointers.
199 static struct NarrowPtrStruct _narrow_klass;
200 static address _narrow_ptrs_base;
201 // CompressedClassSpaceSize set to 1GB, but appear 3GB away from _narrow_ptrs_base during CDS dump.
202 static uint64_t _narrow_klass_range;
203 // array of dummy objects used with +FullGCAlot
204 debug_only(static objArrayOop _fullgc_alot_dummy_array;)
205 // index of next entry to clear
206 debug_only(static int _fullgc_alot_dummy_next;)
207
208 // Compiler/dispatch support
209 static int _base_vtable_size; // Java vtbl size of klass Object (in words)
210
211 // Initialization
212 static bool _bootstrapping; // true during genesis
213 static bool _module_initialized; // true after call_initPhase2 called
214 static bool _fully_initialized; // true after universe_init and initialize_vtables called
215
216 // the array of preallocated errors with backtraces
217 static objArrayOop preallocated_out_of_memory_errors() { return _preallocated_out_of_memory_error_array; }
218
219 // generate an out of memory error; if possible using an error with preallocated backtrace;
220 // otherwise return the given default error.
221 static oop gen_out_of_memory_error(oop default_err);
222
223 // Historic gc information
224 static size_t _heap_capacity_at_last_gc;
225 static size_t _heap_used_at_last_gc;
226
227 static CollectedHeap* create_heap();
228 static jint initialize_heap();
229 static void initialize_basic_type_mirrors(TRAPS);
230 static void fixup_mirrors(TRAPS);
231
232 static void reinitialize_vtable_of(Klass* k, TRAPS);
233 static void reinitialize_itables(TRAPS);
234 static void compute_base_vtable_size(); // compute vtable size of class Object
235
236 static void initialize_oop_storage();
237
238 static void genesis(TRAPS); // Create the initial world
239
240 // Mirrors for primitive classes (created eagerly)
241 static oop check_mirror(oop m) {
242 assert(m != NULL, "mirror not initialized");
243 return m;
244 }
245
246 static void set_narrow_oop_base(address base) {
247 assert(UseCompressedOops, "no compressed oops?");
248 _narrow_oop._base = base;
249 }
250 static void set_narrow_klass_base(address base) {
251 assert(UseCompressedClassPointers, "no compressed klass ptrs?");
252 _narrow_klass._base = base;
253 }
254 static void set_narrow_klass_range(uint64_t range) {
255 assert(UseCompressedClassPointers, "no compressed klass ptrs?");
256 _narrow_klass_range = range;
257 }
258 static void set_narrow_oop_use_implicit_null_checks(bool use) {
259 assert(UseCompressedOops, "no compressed ptrs?");
260 _narrow_oop._use_implicit_null_checks = use;
261 }
262
263 // Debugging
264 static int _verify_count; // number of verifies done
265
266 // True during call to verify(). Should only be set/cleared in verify().
267 static bool _verify_in_progress;
268 static long verify_flags;
269
270 static uintptr_t _verify_oop_mask;
271 static uintptr_t _verify_oop_bits;
272
273 static void calculate_verify_data(HeapWord* low_boundary, HeapWord* high_boundary) PRODUCT_RETURN;
274 static void compute_verify_oop_data();
275
276 public:
277 // Known classes in the VM
278 static Klass* boolArrayKlassObj() { return _boolArrayKlassObj; }
279 static Klass* byteArrayKlassObj() { return _byteArrayKlassObj; }
280 static Klass* charArrayKlassObj() { return _charArrayKlassObj; }
281 static Klass* intArrayKlassObj() { return _intArrayKlassObj; }
282 static Klass* shortArrayKlassObj() { return _shortArrayKlassObj; }
283 static Klass* longArrayKlassObj() { return _longArrayKlassObj; }
284 static Klass* singleArrayKlassObj() { return _singleArrayKlassObj; }
285 static Klass* doubleArrayKlassObj() { return _doubleArrayKlassObj; }
286
287 static Klass* objectArrayKlassObj() {
288 return _objectArrayKlassObj;
289 }
290
291 static Klass* typeArrayKlassObj(BasicType t) {
292 assert((uint)t < T_VOID+1, "range check for type: %s", type2name(t));
293 assert(_typeArrayKlassObjs[t] != NULL, "domain check");
294 return _typeArrayKlassObjs[t];
295 }
296
297 static OopStorage* vm_weak_oop_storage();
298
299 // Known objects in the VM
300 static oop int_mirror() { return check_mirror(_int_mirror); }
301 static oop float_mirror() { return check_mirror(_float_mirror); }
302 static oop double_mirror() { return check_mirror(_double_mirror); }
303 static oop byte_mirror() { return check_mirror(_byte_mirror); }
304 static oop bool_mirror() { return check_mirror(_bool_mirror); }
305 static oop char_mirror() { return check_mirror(_char_mirror); }
306 static oop long_mirror() { return check_mirror(_long_mirror); }
307 static oop short_mirror() { return check_mirror(_short_mirror); }
308 static oop void_mirror() { return check_mirror(_void_mirror); }
309
310 static void set_int_mirror(oop m) { _int_mirror = m; }
311 static void set_float_mirror(oop m) { _float_mirror = m; }
312 static void set_double_mirror(oop m) { _double_mirror = m; }
313 static void set_byte_mirror(oop m) { _byte_mirror = m; }
314 static void set_bool_mirror(oop m) { _bool_mirror = m; }
315 static void set_char_mirror(oop m) { _char_mirror = m; }
316 static void set_long_mirror(oop m) { _long_mirror = m; }
317 static void set_short_mirror(oop m) { _short_mirror = m; }
318 static void set_void_mirror(oop m) { _void_mirror = m; }
319
320 // table of same
321 static oop _mirrors[T_VOID+1];
322
323 static oop java_mirror(BasicType t) {
324 assert((uint)t < T_VOID+1, "range check");
325 return check_mirror(_mirrors[t]);
326 }
327 static oop main_thread_group() { return _main_thread_group; }
328 static void set_main_thread_group(oop group) { _main_thread_group = group;}
329
330 static oop system_thread_group() { return _system_thread_group; }
331 static void set_system_thread_group(oop group) { _system_thread_group = group;}
332
333 static objArrayOop the_empty_class_klass_array () { return _the_empty_class_klass_array; }
334 static Array<Klass*>* the_array_interfaces_array() { return _the_array_interfaces_array; }
335 static oop the_null_string() { return _the_null_string; }
336 static oop the_min_jint_string() { return _the_min_jint_string; }
337
338 static Method* finalizer_register_method() { return _finalizer_register_cache->get_method(); }
339 static Method* loader_addClass_method() { return _loader_addClass_cache->get_method(); }
340
341 static Method* protection_domain_implies_method() { return _pd_implies_cache->get_method(); }
342 static Method* throw_illegal_access_error() { return _throw_illegal_access_error_cache->get_method(); }
343
344 static Method* do_stack_walk_method() { return _do_stack_walk_cache->get_method(); }
345
346 static oop the_null_sentinel() { return _the_null_sentinel; }
347 static address the_null_sentinel_addr() { return (address) &_the_null_sentinel; }
348
349 // Function to initialize these
350 static void initialize_known_methods(TRAPS);
351
352 static oop null_ptr_exception_instance() { return _null_ptr_exception_instance; }
353 static oop arithmetic_exception_instance() { return _arithmetic_exception_instance; }
354 static oop virtual_machine_error_instance() { return _virtual_machine_error_instance; }
355 static oop vm_exception() { return _vm_exception; }
356
357 // Reference pending list manipulation. Access is protected by
358 // Heap_lock. The getter, setter and predicate require the caller
359 // owns the lock. Swap is used by parallel non-concurrent reference
360 // processing threads, where some higher level controller owns
361 // Heap_lock, so requires the lock is locked, but not necessarily by
362 // the current thread.
363 static oop reference_pending_list();
364 static void set_reference_pending_list(oop list);
365 static bool has_reference_pending_list();
366 static oop swap_reference_pending_list(oop list);
367
368 static Array<int>* the_empty_int_array() { return _the_empty_int_array; }
369 static Array<u2>* the_empty_short_array() { return _the_empty_short_array; }
370 static Array<Method*>* the_empty_method_array() { return _the_empty_method_array; }
371 static Array<Klass*>* the_empty_klass_array() { return _the_empty_klass_array; }
372
373 // OutOfMemoryError support. Returns an error with the required message. The returned error
374 // may or may not have a backtrace. If error has a backtrace then the stack trace is already
375 // filled in.
376 static oop out_of_memory_error_java_heap() { return gen_out_of_memory_error(_out_of_memory_error_java_heap); }
377 static oop out_of_memory_error_metaspace() { return gen_out_of_memory_error(_out_of_memory_error_metaspace); }
378 static oop out_of_memory_error_class_metaspace() { return gen_out_of_memory_error(_out_of_memory_error_class_metaspace); }
379 static oop out_of_memory_error_array_size() { return gen_out_of_memory_error(_out_of_memory_error_array_size); }
380 static oop out_of_memory_error_gc_overhead_limit() { return gen_out_of_memory_error(_out_of_memory_error_gc_overhead_limit); }
381 static oop out_of_memory_error_realloc_objects() { return gen_out_of_memory_error(_out_of_memory_error_realloc_objects); }
382 static oop delayed_stack_overflow_error_message() { return _delayed_stack_overflow_error_message; }
383
384 // Accessors needed for fast allocation
385 static Klass** boolArrayKlassObj_addr() { return &_boolArrayKlassObj; }
386 static Klass** byteArrayKlassObj_addr() { return &_byteArrayKlassObj; }
387 static Klass** charArrayKlassObj_addr() { return &_charArrayKlassObj; }
388 static Klass** intArrayKlassObj_addr() { return &_intArrayKlassObj; }
389 static Klass** shortArrayKlassObj_addr() { return &_shortArrayKlassObj; }
390 static Klass** longArrayKlassObj_addr() { return &_longArrayKlassObj; }
391 static Klass** singleArrayKlassObj_addr() { return &_singleArrayKlassObj; }
392 static Klass** doubleArrayKlassObj_addr() { return &_doubleArrayKlassObj; }
393 static Klass** objectArrayKlassObj_addr() { return &_objectArrayKlassObj; }
394
395 // The particular choice of collected heap.
396 static CollectedHeap* heap() { return _collectedHeap; }
397
398 // For UseCompressedOops
399 // Narrow Oop encoding mode:
400 // 0 - Use 32-bits oops without encoding when
401 // NarrowOopHeapBaseMin + heap_size < 4Gb
402 // 1 - Use zero based compressed oops with encoding when
403 // NarrowOopHeapBaseMin + heap_size < 32Gb
404 // 2 - Use compressed oops with disjoint heap base if
405 // base is 32G-aligned and base > 0. This allows certain
406 // optimizations in encoding/decoding.
407 // Disjoint: Bits used in base are disjoint from bits used
408 // for oops ==> oop = (cOop << 3) | base. One can disjoint
409 // the bits of an oop into base and compressed oop.
410 // 3 - Use compressed oops with heap base + encoding.
411 enum NARROW_OOP_MODE {
412 UnscaledNarrowOop = 0,
413 ZeroBasedNarrowOop = 1,
414 DisjointBaseNarrowOop = 2,
415 HeapBasedNarrowOop = 3,
416 AnyNarrowOopMode = 4
417 };
418 static NARROW_OOP_MODE narrow_oop_mode();
419 static const char* narrow_oop_mode_to_string(NARROW_OOP_MODE mode);
420 static char* preferred_heap_base(size_t heap_size, size_t alignment, NARROW_OOP_MODE mode);
421 static char* preferred_metaspace_base(size_t heap_size, NARROW_OOP_MODE mode);
422 static address narrow_oop_base() { return _narrow_oop._base; }
423 // Test whether bits of addr and possible offsets into the heap overlap.
424 static bool is_disjoint_heap_base_address(address addr) {
425 return (((uint64_t)(intptr_t)addr) &
426 (((uint64_t)UCONST64(0xFFFFffffFFFFffff)) >> (32-LogMinObjAlignmentInBytes))) == 0;
427 }
428 // Check for disjoint base compressed oops.
429 static bool narrow_oop_base_disjoint() {
430 return _narrow_oop._base != NULL && is_disjoint_heap_base_address(_narrow_oop._base);
431 }
432 // Check for real heapbased compressed oops.
433 // We must subtract the base as the bits overlap.
434 // If we negate above function, we also get unscaled and zerobased.
435 static bool narrow_oop_base_overlaps() {
436 return _narrow_oop._base != NULL && !is_disjoint_heap_base_address(_narrow_oop._base);
437 }
438 static bool is_narrow_oop_base(void* addr) { return (narrow_oop_base() == (address)addr); }
439 static int narrow_oop_shift() { return _narrow_oop._shift; }
440 static bool narrow_oop_use_implicit_null_checks() { return _narrow_oop._use_implicit_null_checks; }
441
442 // For UseCompressedClassPointers
443 static address narrow_klass_base() { return _narrow_klass._base; }
444 static bool is_narrow_klass_base(void* addr) { return (narrow_klass_base() == (address)addr); }
445 static uint64_t narrow_klass_range() { return _narrow_klass_range; }
446 static int narrow_klass_shift() { return _narrow_klass._shift; }
447 static bool narrow_klass_use_implicit_null_checks() { return _narrow_klass._use_implicit_null_checks; }
448
449 static address* narrow_ptrs_base_addr() { return &_narrow_ptrs_base; }
450 static void set_narrow_ptrs_base(address a) { _narrow_ptrs_base = a; }
451 static address narrow_ptrs_base() { return _narrow_ptrs_base; }
452
453 static void print_compressed_oops_mode(outputStream* st);
454
455 // this is set in vm_version on sparc (and then reset in universe afaict)
456 static void set_narrow_oop_shift(int shift) {
457 _narrow_oop._shift = shift;
458 }
459
460 static void set_narrow_klass_shift(int shift) {
461 assert(shift == 0 || shift == LogKlassAlignmentInBytes, "invalid shift for klass ptrs");
462 _narrow_klass._shift = shift;
463 }
464
465 // Reserve Java heap and determine CompressedOops mode
466 static ReservedSpace reserve_heap(size_t heap_size, size_t alignment);
467
468 // Historic gc information
469 static size_t get_heap_capacity_at_last_gc() { return _heap_capacity_at_last_gc; }
470 static size_t get_heap_free_at_last_gc() { return _heap_capacity_at_last_gc - _heap_used_at_last_gc; }
471 static size_t get_heap_used_at_last_gc() { return _heap_used_at_last_gc; }
472 static void update_heap_info_at_gc();
473
474 // Testers
475 static bool is_bootstrapping() { return _bootstrapping; }
476 static bool is_module_initialized() { return _module_initialized; }
477 static bool is_fully_initialized() { return _fully_initialized; }
478
479 static bool on_page_boundary(void* addr);
480 static bool should_fill_in_stack_trace(Handle throwable);
481 static void check_alignment(uintx size, uintx alignment, const char* name);
482
483 // Iteration
484
485 // Apply "f" to the addresses of all the direct heap pointers maintained
486 // as static fields of "Universe".
487 static void oops_do(OopClosure* f, bool do_all = false);
488
489 // CDS support
490 static void serialize(SerializeClosure* f, bool do_all = false);
491
492 // Apply "f" to all klasses for basic types (classes not present in
493 // SystemDictionary).
494 static void basic_type_classes_do(void f(Klass*));
495 static void metaspace_pointers_do(MetaspaceClosure* it);
496
497 // Debugging
498 enum VERIFY_FLAGS {
499 Verify_Threads = 1,
500 Verify_Heap = 2,
501 Verify_SymbolTable = 4,
502 Verify_StringTable = 8,
503 Verify_CodeCache = 16,
504 Verify_SystemDictionary = 32,
505 Verify_ClassLoaderDataGraph = 64,
506 Verify_MetaspaceUtils = 128,
507 Verify_JNIHandles = 256,
508 Verify_CodeCacheOops = 512,
509 Verify_All = -1
510 };
511 static void initialize_verify_flags();
512 static bool should_verify_subset(uint subset);
513 static bool verify_in_progress() { return _verify_in_progress; }
514 static void verify(VerifyOption option, const char* prefix);
515 static void verify(const char* prefix) {
516 verify(VerifyOption_Default, prefix);
517 }
518 static void verify() {
519 verify("");
520 }
521
522 static int verify_count() { return _verify_count; }
523 static void print_on(outputStream* st);
524 static void print_heap_at_SIGBREAK();
525 static void print_heap_before_gc();
526 static void print_heap_after_gc();
527
528 // Change the number of dummy objects kept reachable by the full gc dummy
529 // array; this should trigger relocation in a sliding compaction collector.
530 debug_only(static bool release_fullgc_alot_dummy();)
531 // The non-oop pattern (see compiledIC.hpp, etc)
532 static void* non_oop_word();
533
534 // Oop verification (see MacroAssembler::verify_oop)
535 static uintptr_t verify_oop_mask() PRODUCT_RETURN0;
536 static uintptr_t verify_oop_bits() PRODUCT_RETURN0;
537 static uintptr_t verify_mark_bits() PRODUCT_RETURN0;
538 static uintptr_t verify_mark_mask() PRODUCT_RETURN0;
539
540 // Compiler support
541 static int base_vtable_size() { return _base_vtable_size; }
542 };
543
544 class DeferredObjAllocEvent : public CHeapObj<mtInternal> {
545 private:
546 oop _oop;
547 size_t _bytesize;
548 jint _arena_id;
549
550 public:
551 DeferredObjAllocEvent(const oop o, const size_t s, const jint id) {
552 _oop = o;
553 _bytesize = s;
554 _arena_id = id;
555 }
556
557 ~DeferredObjAllocEvent() {
558 }
559
560 jint arena_id() { return _arena_id; }
561 size_t bytesize() { return _bytesize; }
562 oop get_oop() { return _oop; }
563 };
564
565 #endif // SHARE_VM_MEMORY_UNIVERSE_HPP