1 /* 2 * Copyright (c) 1997, 2012, 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_ALLOCATION_HPP 26 #define SHARE_VM_MEMORY_ALLOCATION_HPP 27 28 #include "runtime/globals.hpp" 29 #include "utilities/globalDefinitions.hpp" 30 #include "utilities/macros.hpp" 31 #ifdef COMPILER1 32 #include "c1/c1_globals.hpp" 33 #endif 34 #ifdef COMPILER2 35 #include "opto/c2_globals.hpp" 36 #endif 37 38 #include <new> 39 40 #define ARENA_ALIGN_M1 (((size_t)(ARENA_AMALLOC_ALIGNMENT)) - 1) 41 #define ARENA_ALIGN_MASK (~((size_t)ARENA_ALIGN_M1)) 42 #define ARENA_ALIGN(x) ((((size_t)(x)) + ARENA_ALIGN_M1) & ARENA_ALIGN_MASK) 43 44 45 // noinline attribute 46 #ifdef _WINDOWS 47 #define _NOINLINE_ __declspec(noinline) 48 #else 49 #if __GNUC__ < 3 // gcc 2.x does not support noinline attribute 50 #define _NOINLINE_ 51 #else 52 #define _NOINLINE_ __attribute__ ((noinline)) 53 #endif 54 #endif 55 56 class AllocFailStrategy { 57 public: 58 enum AllocFailEnum { EXIT_OOM, RETURN_NULL }; 59 }; 60 typedef AllocFailStrategy::AllocFailEnum AllocFailType; 61 62 // All classes in the virtual machine must be subclassed 63 // by one of the following allocation classes: 64 // 65 // For objects allocated in the resource area (see resourceArea.hpp). 66 // - ResourceObj 67 // 68 // For objects allocated in the C-heap (managed by: free & malloc). 69 // - CHeapObj 70 // 71 // For objects allocated on the stack. 72 // - StackObj 73 // 74 // For embedded objects. 75 // - ValueObj 76 // 77 // For classes used as name spaces. 78 // - AllStatic 79 // 80 // For classes in Metaspace (class data) 81 // - MetaspaceObj 82 // 83 // The printable subclasses are used for debugging and define virtual 84 // member functions for printing. Classes that avoid allocating the 85 // vtbl entries in the objects should therefore not be the printable 86 // subclasses. 87 // 88 // The following macros and function should be used to allocate memory 89 // directly in the resource area or in the C-heap: 90 // 91 // NEW_RESOURCE_ARRAY(type,size) 92 // NEW_RESOURCE_OBJ(type) 93 // NEW_C_HEAP_ARRAY(type,size) 94 // NEW_C_HEAP_OBJ(type) 95 // char* AllocateHeap(size_t size, const char* name); 96 // void FreeHeap(void* p); 97 // 98 // C-heap allocation can be traced using +PrintHeapAllocation. 99 // malloc and free should therefore never called directly. 100 101 // Base class for objects allocated in the C-heap. 102 103 // In non product mode we introduce a super class for all allocation classes 104 // that supports printing. 105 // We avoid the superclass in product mode since some C++ compilers add 106 // a word overhead for empty super classes. 107 108 #ifdef PRODUCT 109 #define ALLOCATION_SUPER_CLASS_SPEC 110 #else 111 #define ALLOCATION_SUPER_CLASS_SPEC : public AllocatedObj 112 class AllocatedObj { 113 public: 114 // Printing support 115 void print() const; 116 void print_value() const; 117 118 virtual void print_on(outputStream* st) const; 119 virtual void print_value_on(outputStream* st) const; 120 }; 121 #endif 122 123 124 /* 125 * MemoryType bitmap layout: 126 * | 16 15 14 13 12 11 10 09 | 08 07 06 05 | 04 03 02 01 | 127 * | memory type | object | reserved | 128 * | | type | | 129 */ 130 enum MemoryType { 131 // Memory type by sub systems. It occupies lower byte. 132 mtNone = 0x0000, // undefined 133 mtClass = 0x0100, // memory class for Java classes 134 mtThread = 0x0200, // memory for thread objects 135 mtThreadStack = 0x0300, 136 mtCode = 0x0400, // memory for generated code 137 mtGC = 0x0500, // memory for GC 138 mtCompiler = 0x0600, // memory for compiler 139 mtInternal = 0x0700, // memory used by VM, but does not belong to 140 // any of above categories, and not used for 141 // native memory tracking 142 mtOther = 0x0800, // memory not used by VM 143 mtSymbol = 0x0900, // symbol 144 mtNMT = 0x0A00, // memory used by native memory tracking 145 mtChunk = 0x0B00, // chunk that holds content of arenas 146 mtJavaHeap = 0x0C00, // Java heap 147 mtClassShared = 0x0D00, // class data sharing 148 mt_number_of_types = 0x000D, // number of memory types (mtDontTrack 149 // is not included as validate type) 150 mtDontTrack = 0x0E00, // memory we do not or cannot track 151 mt_masks = 0x7F00, 152 153 // object type mask 154 otArena = 0x0010, // an arena object 155 otNMTRecorder = 0x0020, // memory recorder object 156 ot_masks = 0x00F0 157 }; 158 159 #define IS_MEMORY_TYPE(flags, type) ((flags & mt_masks) == type) 160 #define HAS_VALID_MEMORY_TYPE(flags)((flags & mt_masks) != mtNone) 161 #define FLAGS_TO_MEMORY_TYPE(flags) (flags & mt_masks) 162 163 #define IS_ARENA_OBJ(flags) ((flags & ot_masks) == otArena) 164 #define IS_NMT_RECORDER(flags) ((flags & ot_masks) == otNMTRecorder) 165 #define NMT_CAN_TRACK(flags) (!IS_NMT_RECORDER(flags) && !(IS_MEMORY_TYPE(flags, mtDontTrack))) 166 167 typedef unsigned short MEMFLAGS; 168 169 #if INCLUDE_NMT 170 171 extern bool NMT_track_callsite; 172 173 #else 174 175 const bool NMT_track_callsite = false; 176 177 #endif // INCLUDE_NMT 178 179 // debug build does not inline 180 #if defined(_DEBUG_) 181 #define CURRENT_PC (NMT_track_callsite ? os::get_caller_pc(1) : 0) 182 #define CALLER_PC (NMT_track_callsite ? os::get_caller_pc(2) : 0) 183 #define CALLER_CALLER_PC (NMT_track_callsite ? os::get_caller_pc(3) : 0) 184 #else 185 #define CURRENT_PC (NMT_track_callsite? os::get_caller_pc(0) : 0) 186 #define CALLER_PC (NMT_track_callsite ? os::get_caller_pc(1) : 0) 187 #define CALLER_CALLER_PC (NMT_track_callsite ? os::get_caller_pc(2) : 0) 188 #endif 189 190 191 192 template <MEMFLAGS F> class CHeapObj ALLOCATION_SUPER_CLASS_SPEC { 193 public: 194 _NOINLINE_ void* operator new(size_t size, address caller_pc = 0); 195 _NOINLINE_ void* operator new (size_t size, const std::nothrow_t& nothrow_constant, 196 address caller_pc = 0); 197 198 void operator delete(void* p); 199 }; 200 201 // Base class for objects allocated on the stack only. 202 // Calling new or delete will result in fatal error. 203 204 class StackObj ALLOCATION_SUPER_CLASS_SPEC { 205 public: 206 void* operator new(size_t size); 207 void operator delete(void* p); 208 }; 209 210 // Base class for objects used as value objects. 211 // Calling new or delete will result in fatal error. 212 // 213 // Portability note: Certain compilers (e.g. gcc) will 214 // always make classes bigger if it has a superclass, even 215 // if the superclass does not have any virtual methods or 216 // instance fields. The HotSpot implementation relies on this 217 // not to happen. So never make a ValueObj class a direct subclass 218 // of this object, but use the VALUE_OBJ_CLASS_SPEC class instead, e.g., 219 // like this: 220 // 221 // class A VALUE_OBJ_CLASS_SPEC { 222 // ... 223 // } 224 // 225 // With gcc and possible other compilers the VALUE_OBJ_CLASS_SPEC can 226 // be defined as a an empty string "". 227 // 228 class _ValueObj { 229 public: 230 void* operator new(size_t size); 231 void operator delete(void* p); 232 }; 233 234 235 // Base class for objects stored in Metaspace. 236 // Calling delete will result in fatal error. 237 // 238 // Do not inherit from something with a vptr because this class does 239 // not introduce one. This class is used to allocate both shared read-only 240 // and shared read-write classes. 241 // 242 243 class ClassLoaderData; 244 245 class MetaspaceObj { 246 public: 247 bool is_metadata() const; 248 bool is_metaspace_object() const; // more specific test but slower 249 bool is_shared() const; 250 void print_address_on(outputStream* st) const; // nonvirtual address printing 251 252 void* operator new(size_t size, ClassLoaderData* loader_data, 253 size_t word_size, bool read_only, Thread* thread); 254 // can't use TRAPS from this header file. 255 void operator delete(void* p) { ShouldNotCallThis(); } 256 }; 257 258 // Base class for classes that constitute name spaces. 259 260 class AllStatic { 261 public: 262 AllStatic() { ShouldNotCallThis(); } 263 ~AllStatic() { ShouldNotCallThis(); } 264 }; 265 266 267 //------------------------------Chunk------------------------------------------ 268 // Linked list of raw memory chunks 269 class Chunk: CHeapObj<mtChunk> { 270 friend class VMStructs; 271 272 protected: 273 Chunk* _next; // Next Chunk in list 274 const size_t _len; // Size of this Chunk 275 public: 276 void* operator new(size_t size, size_t length); 277 void operator delete(void* p); 278 Chunk(size_t length); 279 280 enum { 281 // default sizes; make them slightly smaller than 2**k to guard against 282 // buddy-system style malloc implementations 283 #ifdef _LP64 284 slack = 40, // [RGV] Not sure if this is right, but make it 285 // a multiple of 8. 286 #else 287 slack = 20, // suspected sizeof(Chunk) + internal malloc headers 288 #endif 289 290 init_size = 1*K - slack, // Size of first chunk 291 medium_size= 10*K - slack, // Size of medium-sized chunk 292 size = 32*K - slack, // Default size of an Arena chunk (following the first) 293 non_pool_size = init_size + 32 // An initial size which is not one of above 294 }; 295 296 void chop(); // Chop this chunk 297 void next_chop(); // Chop next chunk 298 static size_t aligned_overhead_size(void) { return ARENA_ALIGN(sizeof(Chunk)); } 299 static size_t aligned_overhead_size(size_t byte_size) { return ARENA_ALIGN(byte_size); } 300 301 size_t length() const { return _len; } 302 Chunk* next() const { return _next; } 303 void set_next(Chunk* n) { _next = n; } 304 // Boundaries of data area (possibly unused) 305 char* bottom() const { return ((char*) this) + aligned_overhead_size(); } 306 char* top() const { return bottom() + _len; } 307 bool contains(char* p) const { return bottom() <= p && p <= top(); } 308 309 // Start the chunk_pool cleaner task 310 static void start_chunk_pool_cleaner_task(); 311 312 static void clean_chunk_pool(); 313 }; 314 315 //------------------------------Arena------------------------------------------ 316 // Fast allocation of memory 317 class Arena : public CHeapObj<mtNone|otArena> { 318 protected: 319 friend class ResourceMark; 320 friend class HandleMark; 321 friend class NoHandleMark; 322 friend class VMStructs; 323 324 Chunk *_first; // First chunk 325 Chunk *_chunk; // current chunk 326 char *_hwm, *_max; // High water mark and max in current chunk 327 // Get a new Chunk of at least size x 328 void* grow(size_t x, AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM); 329 size_t _size_in_bytes; // Size of arena (used for native memory tracking) 330 331 NOT_PRODUCT(static julong _bytes_allocated;) // total #bytes allocated since start 332 friend class AllocStats; 333 debug_only(void* malloc(size_t size);) 334 debug_only(void* internal_malloc_4(size_t x);) 335 NOT_PRODUCT(void inc_bytes_allocated(size_t x);) 336 337 void signal_out_of_memory(size_t request, const char* whence) const; 338 339 void check_for_overflow(size_t request, const char* whence) const { 340 if (UINTPTR_MAX - request < (uintptr_t)_hwm) { 341 signal_out_of_memory(request, whence); 342 } 343 } 344 345 public: 346 Arena(); 347 Arena(size_t init_size); 348 ~Arena(); 349 void destruct_contents(); 350 char* hwm() const { return _hwm; } 351 352 // new operators 353 void* operator new (size_t size); 354 void* operator new (size_t size, const std::nothrow_t& nothrow_constant); 355 356 // dynamic memory type tagging 357 void* operator new(size_t size, MEMFLAGS flags); 358 void* operator new(size_t size, const std::nothrow_t& nothrow_constant, MEMFLAGS flags); 359 void operator delete(void* p); 360 361 // Fast allocate in the arena. Common case is: pointer test + increment. 362 void* Amalloc(size_t x, AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM) { 363 assert(is_power_of_2(ARENA_AMALLOC_ALIGNMENT) , "should be a power of 2"); 364 x = ARENA_ALIGN(x); 365 debug_only(if (UseMallocOnly) return malloc(x);) 366 check_for_overflow(x, "Arena::Amalloc"); 367 NOT_PRODUCT(inc_bytes_allocated(x);) 368 if (_hwm + x > _max) { 369 return grow(x, alloc_failmode); 370 } else { 371 char *old = _hwm; 372 _hwm += x; 373 return old; 374 } 375 } 376 // Further assume size is padded out to words 377 void *Amalloc_4(size_t x, AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM) { 378 assert( (x&(sizeof(char*)-1)) == 0, "misaligned size" ); 379 debug_only(if (UseMallocOnly) return malloc(x);) 380 check_for_overflow(x, "Arena::Amalloc_4"); 381 NOT_PRODUCT(inc_bytes_allocated(x);) 382 if (_hwm + x > _max) { 383 return grow(x, alloc_failmode); 384 } else { 385 char *old = _hwm; 386 _hwm += x; 387 return old; 388 } 389 } 390 391 // Allocate with 'double' alignment. It is 8 bytes on sparc. 392 // In other cases Amalloc_D() should be the same as Amalloc_4(). 393 void* Amalloc_D(size_t x, AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM) { 394 assert( (x&(sizeof(char*)-1)) == 0, "misaligned size" ); 395 debug_only(if (UseMallocOnly) return malloc(x);) 396 #if defined(SPARC) && !defined(_LP64) 397 #define DALIGN_M1 7 398 size_t delta = (((size_t)_hwm + DALIGN_M1) & ~DALIGN_M1) - (size_t)_hwm; 399 x += delta; 400 #endif 401 check_for_overflow(x, "Arena::Amalloc_D"); 402 NOT_PRODUCT(inc_bytes_allocated(x);) 403 if (_hwm + x > _max) { 404 return grow(x, alloc_failmode); // grow() returns a result aligned >= 8 bytes. 405 } else { 406 char *old = _hwm; 407 _hwm += x; 408 #if defined(SPARC) && !defined(_LP64) 409 old += delta; // align to 8-bytes 410 #endif 411 return old; 412 } 413 } 414 415 // Fast delete in area. Common case is: NOP (except for storage reclaimed) 416 void Afree(void *ptr, size_t size) { 417 #ifdef ASSERT 418 if (ZapResourceArea) memset(ptr, badResourceValue, size); // zap freed memory 419 if (UseMallocOnly) return; 420 #endif 421 if (((char*)ptr) + size == _hwm) _hwm = (char*)ptr; 422 } 423 424 void *Arealloc( void *old_ptr, size_t old_size, size_t new_size, 425 AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM); 426 427 // Move contents of this arena into an empty arena 428 Arena *move_contents(Arena *empty_arena); 429 430 // Determine if pointer belongs to this Arena or not. 431 bool contains( const void *ptr ) const; 432 433 // Total of all chunks in use (not thread-safe) 434 size_t used() const; 435 436 // Total # of bytes used 437 size_t size_in_bytes() const { return _size_in_bytes; }; 438 void set_size_in_bytes(size_t size); 439 440 static void free_malloced_objects(Chunk* chunk, char* hwm, char* max, char* hwm2) PRODUCT_RETURN; 441 static void free_all(char** start, char** end) PRODUCT_RETURN; 442 443 // how many arena instances 444 NOT_PRODUCT(static volatile jint _instance_count;) 445 private: 446 // Reset this Arena to empty, access will trigger grow if necessary 447 void reset(void) { 448 _first = _chunk = NULL; 449 _hwm = _max = NULL; 450 set_size_in_bytes(0); 451 } 452 }; 453 454 // One of the following macros must be used when allocating 455 // an array or object from an arena 456 #define NEW_ARENA_ARRAY(arena, type, size) \ 457 (type*) (arena)->Amalloc((size) * sizeof(type)) 458 459 #define REALLOC_ARENA_ARRAY(arena, type, old, old_size, new_size) \ 460 (type*) (arena)->Arealloc((char*)(old), (old_size) * sizeof(type), \ 461 (new_size) * sizeof(type) ) 462 463 #define FREE_ARENA_ARRAY(arena, type, old, size) \ 464 (arena)->Afree((char*)(old), (size) * sizeof(type)) 465 466 #define NEW_ARENA_OBJ(arena, type) \ 467 NEW_ARENA_ARRAY(arena, type, 1) 468 469 470 //%note allocation_1 471 extern char* resource_allocate_bytes(size_t size, 472 AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM); 473 extern char* resource_allocate_bytes(Thread* thread, size_t size, 474 AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM); 475 extern char* resource_reallocate_bytes( char *old, size_t old_size, size_t new_size, 476 AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM); 477 extern void resource_free_bytes( char *old, size_t size ); 478 479 //---------------------------------------------------------------------- 480 // Base class for objects allocated in the resource area per default. 481 // Optionally, objects may be allocated on the C heap with 482 // new(ResourceObj::C_HEAP) Foo(...) or in an Arena with new (&arena) 483 // ResourceObj's can be allocated within other objects, but don't use 484 // new or delete (allocation_type is unknown). If new is used to allocate, 485 // use delete to deallocate. 486 class ResourceObj ALLOCATION_SUPER_CLASS_SPEC { 487 public: 488 enum allocation_type { STACK_OR_EMBEDDED = 0, RESOURCE_AREA, C_HEAP, ARENA, allocation_mask = 0x3 }; 489 static void set_allocation_type(address res, allocation_type type) NOT_DEBUG_RETURN; 490 #ifdef ASSERT 491 private: 492 // When this object is allocated on stack the new() operator is not 493 // called but garbage on stack may look like a valid allocation_type. 494 // Store negated 'this' pointer when new() is called to distinguish cases. 495 // Use second array's element for verification value to distinguish garbage. 496 uintptr_t _allocation_t[2]; 497 bool is_type_set() const; 498 public: 499 allocation_type get_allocation_type() const; 500 bool allocated_on_stack() const { return get_allocation_type() == STACK_OR_EMBEDDED; } 501 bool allocated_on_res_area() const { return get_allocation_type() == RESOURCE_AREA; } 502 bool allocated_on_C_heap() const { return get_allocation_type() == C_HEAP; } 503 bool allocated_on_arena() const { return get_allocation_type() == ARENA; } 504 ResourceObj(); // default construtor 505 ResourceObj(const ResourceObj& r); // default copy construtor 506 ResourceObj& operator=(const ResourceObj& r); // default copy assignment 507 ~ResourceObj(); 508 #endif // ASSERT 509 510 public: 511 void* operator new(size_t size, allocation_type type, MEMFLAGS flags); 512 void* operator new(size_t size, const std::nothrow_t& nothrow_constant, 513 allocation_type type, MEMFLAGS flags); 514 void* operator new(size_t size, Arena *arena) { 515 address res = (address)arena->Amalloc(size); 516 DEBUG_ONLY(set_allocation_type(res, ARENA);) 517 return res; 518 } 519 void* operator new(size_t size) { 520 address res = (address)resource_allocate_bytes(size); 521 DEBUG_ONLY(set_allocation_type(res, RESOURCE_AREA);) 522 return res; 523 } 524 525 void* operator new(size_t size, const std::nothrow_t& nothrow_constant) { 526 address res = (address)resource_allocate_bytes(size, AllocFailStrategy::RETURN_NULL); 527 DEBUG_ONLY(if (res != NULL) set_allocation_type(res, RESOURCE_AREA);) 528 return res; 529 } 530 531 void operator delete(void* p); 532 }; 533 534 // One of the following macros must be used when allocating an array 535 // or object to determine whether it should reside in the C heap on in 536 // the resource area. 537 538 #define NEW_RESOURCE_ARRAY(type, size)\ 539 (type*) resource_allocate_bytes((size) * sizeof(type)) 540 541 #define NEW_RESOURCE_ARRAY_IN_THREAD(thread, type, size)\ 542 (type*) resource_allocate_bytes(thread, (size) * sizeof(type)) 543 544 #define REALLOC_RESOURCE_ARRAY(type, old, old_size, new_size)\ 545 (type*) resource_reallocate_bytes((char*)(old), (old_size) * sizeof(type), (new_size) * sizeof(type) ) 546 547 #define FREE_RESOURCE_ARRAY(type, old, size)\ 548 resource_free_bytes((char*)(old), (size) * sizeof(type)) 549 550 #define FREE_FAST(old)\ 551 /* nop */ 552 553 #define NEW_RESOURCE_OBJ(type)\ 554 NEW_RESOURCE_ARRAY(type, 1) 555 556 #define NEW_C_HEAP_ARRAY(type, size, memflags)\ 557 (type*) (AllocateHeap((size) * sizeof(type), memflags)) 558 559 #define REALLOC_C_HEAP_ARRAY(type, old, size, memflags)\ 560 (type*) (ReallocateHeap((char*)old, (size) * sizeof(type), memflags)) 561 562 #define FREE_C_HEAP_ARRAY(type,old,memflags) \ 563 FreeHeap((char*)(old), memflags) 564 565 #define NEW_C_HEAP_OBJ(type, memflags)\ 566 NEW_C_HEAP_ARRAY(type, 1, memflags) 567 568 569 #define NEW_C_HEAP_ARRAY2(type, size, memflags, pc)\ 570 (type*) (AllocateHeap((size) * sizeof(type), memflags, pc)) 571 572 #define REALLOC_C_HEAP_ARRAY2(type, old, size, memflags, pc)\ 573 (type*) (ReallocateHeap((char*)old, (size) * sizeof(type), memflags, pc)) 574 575 #define NEW_C_HEAP_OBJ2(type, memflags, pc)\ 576 NEW_C_HEAP_ARRAY2(type, 1, memflags, pc) 577 578 579 extern bool warn_new_operator; 580 581 // for statistics 582 #ifndef PRODUCT 583 class AllocStats : StackObj { 584 julong start_mallocs, start_frees; 585 julong start_malloc_bytes, start_mfree_bytes, start_res_bytes; 586 public: 587 AllocStats(); 588 589 julong num_mallocs(); // since creation of receiver 590 julong alloc_bytes(); 591 julong num_frees(); 592 julong free_bytes(); 593 julong resource_bytes(); 594 void print(); 595 }; 596 #endif 597 598 599 //------------------------------ReallocMark--------------------------------- 600 // Code which uses REALLOC_RESOURCE_ARRAY should check an associated 601 // ReallocMark, which is declared in the same scope as the reallocated 602 // pointer. Any operation that could __potentially__ cause a reallocation 603 // should check the ReallocMark. 604 class ReallocMark: public StackObj { 605 protected: 606 NOT_PRODUCT(int _nesting;) 607 608 public: 609 ReallocMark() PRODUCT_RETURN; 610 void check() PRODUCT_RETURN; 611 }; 612 613 #endif // SHARE_VM_MEMORY_ALLOCATION_HPP