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