1 /* 2 * Copyright (c) 1997, 2013, 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, The _OBJ variants 90 // of the NEW/FREE_C_HEAP macros are used for alloc/dealloc simple 91 // objects which are not inherited from CHeapObj, note constructor and 92 // destructor are not called. The preferable way to allocate objects 93 // is using the new operator. 94 // 95 // WARNING: The array variant must only be used for a homogenous array 96 // where all objects are of the exact type specified. If subtypes are 97 // stored in the array then must pay attention to calling destructors 98 // at needed. 99 // 100 // NEW_RESOURCE_ARRAY(type, size) 101 // NEW_RESOURCE_OBJ(type) 102 // NEW_C_HEAP_ARRAY(type, size) 103 // NEW_C_HEAP_OBJ(type, memflags) 104 // FREE_C_HEAP_ARRAY(type, old, memflags) 105 // FREE_C_HEAP_OBJ(objname, type, memflags) 106 // char* AllocateHeap(size_t size, const char* name); 107 // void FreeHeap(void* p); 108 // 109 // C-heap allocation can be traced using +PrintHeapAllocation. 110 // malloc and free should therefore never called directly. 111 112 // Base class for objects allocated in the C-heap. 113 114 // In non product mode we introduce a super class for all allocation classes 115 // that supports printing. 116 // We avoid the superclass in product mode since some C++ compilers add 117 // a word overhead for empty super classes. 118 119 #ifdef PRODUCT 120 #define ALLOCATION_SUPER_CLASS_SPEC 121 #else 122 #define ALLOCATION_SUPER_CLASS_SPEC : public AllocatedObj 123 class AllocatedObj { 124 public: 125 // Printing support 126 void print() const; 127 void print_value() const; 128 129 virtual void print_on(outputStream* st) const; 130 virtual void print_value_on(outputStream* st) const; 131 }; 132 #endif 133 134 135 /* 136 * MemoryType bitmap layout: 137 * | 16 15 14 13 12 11 10 09 | 08 07 06 05 | 04 03 02 01 | 138 * | memory type | object | reserved | 139 * | | type | | 140 */ 141 enum MemoryType { 142 // Memory type by sub systems. It occupies lower byte. 143 mtNone = 0x0000, // undefined 144 mtClass = 0x0100, // memory class for Java classes 145 mtThread = 0x0200, // memory for thread objects 146 mtThreadStack = 0x0300, 147 mtCode = 0x0400, // memory for generated code 148 mtGC = 0x0500, // memory for GC 149 mtCompiler = 0x0600, // memory for compiler 150 mtInternal = 0x0700, // memory used by VM, but does not belong to 151 // any of above categories, and not used for 152 // native memory tracking 153 mtOther = 0x0800, // memory not used by VM 154 mtSymbol = 0x0900, // symbol 155 mtNMT = 0x0A00, // memory used by native memory tracking 156 mtChunk = 0x0B00, // chunk that holds content of arenas 157 mtJavaHeap = 0x0C00, // Java heap 158 mtClassShared = 0x0D00, // class data sharing 159 mtTest = 0x0E00, // Test type for verifying NMT 160 mtTracing = 0x0F00, // memory used for Tracing 161 mt_number_of_types = 0x000F, // number of memory types (mtDontTrack 162 // is not included as validate type) 163 mtDontTrack = 0x0F00, // memory we do not or cannot track 164 mt_masks = 0x7F00, 165 166 // object type mask 167 otArena = 0x0010, // an arena object 168 otNMTRecorder = 0x0020, // memory recorder object 169 ot_masks = 0x00F0 170 }; 171 172 #define IS_MEMORY_TYPE(flags, type) ((flags & mt_masks) == type) 173 #define HAS_VALID_MEMORY_TYPE(flags)((flags & mt_masks) != mtNone) 174 #define FLAGS_TO_MEMORY_TYPE(flags) (flags & mt_masks) 175 176 #define IS_ARENA_OBJ(flags) ((flags & ot_masks) == otArena) 177 #define IS_NMT_RECORDER(flags) ((flags & ot_masks) == otNMTRecorder) 178 #define NMT_CAN_TRACK(flags) (!IS_NMT_RECORDER(flags) && !(IS_MEMORY_TYPE(flags, mtDontTrack))) 179 180 typedef unsigned short MEMFLAGS; 181 182 #if INCLUDE_NMT 183 184 extern bool NMT_track_callsite; 185 186 #else 187 188 const bool NMT_track_callsite = false; 189 190 #endif // INCLUDE_NMT 191 192 // debug build does not inline 193 #if defined(_NMT_NOINLINE_) 194 #define CURRENT_PC (NMT_track_callsite ? os::get_caller_pc(1) : 0) 195 #define CALLER_PC (NMT_track_callsite ? os::get_caller_pc(2) : 0) 196 #define CALLER_CALLER_PC (NMT_track_callsite ? os::get_caller_pc(3) : 0) 197 #else 198 #define CURRENT_PC (NMT_track_callsite? os::get_caller_pc(0) : 0) 199 #define CALLER_PC (NMT_track_callsite ? os::get_caller_pc(1) : 0) 200 #define CALLER_CALLER_PC (NMT_track_callsite ? os::get_caller_pc(2) : 0) 201 #endif 202 203 204 205 template <MEMFLAGS F> class CHeapObj ALLOCATION_SUPER_CLASS_SPEC { 206 public: 207 _NOINLINE_ void* operator new(size_t size, address caller_pc = 0); 208 _NOINLINE_ void* operator new (size_t size, const std::nothrow_t& nothrow_constant, 209 address caller_pc = 0); 210 _NOINLINE_ void* operator new [](size_t size, address caller_pc = 0); 211 _NOINLINE_ void* operator new [](size_t size, const std::nothrow_t& nothrow_constant, 212 address caller_pc = 0); 213 void operator delete(void* p); 214 void operator delete [] (void* p); 215 }; 216 217 // Base class for objects allocated on the stack only. 218 // Calling new or delete will result in fatal error. 219 220 class StackObj ALLOCATION_SUPER_CLASS_SPEC { 221 private: 222 void* operator new(size_t size); 223 void operator delete(void* p); 224 void* operator new [](size_t size); 225 void operator delete [](void* p); 226 }; 227 228 // Base class for objects used as value objects. 229 // Calling new or delete will result in fatal error. 230 // 231 // Portability note: Certain compilers (e.g. gcc) will 232 // always make classes bigger if it has a superclass, even 233 // if the superclass does not have any virtual methods or 234 // instance fields. The HotSpot implementation relies on this 235 // not to happen. So never make a ValueObj class a direct subclass 236 // of this object, but use the VALUE_OBJ_CLASS_SPEC class instead, e.g., 237 // like this: 238 // 239 // class A VALUE_OBJ_CLASS_SPEC { 240 // ... 241 // } 242 // 243 // With gcc and possible other compilers the VALUE_OBJ_CLASS_SPEC can 244 // be defined as a an empty string "". 245 // 246 class _ValueObj { 247 private: 248 void* operator new(size_t size); 249 void operator delete(void* p); 250 void* operator new [](size_t size); 251 void operator delete [](void* p); 252 }; 253 254 255 // Base class for objects stored in Metaspace. 256 // Calling delete will result in fatal error. 257 // 258 // Do not inherit from something with a vptr because this class does 259 // not introduce one. This class is used to allocate both shared read-only 260 // and shared read-write classes. 261 // 262 263 class ClassLoaderData; 264 265 class MetaspaceObj { 266 public: 267 bool is_metadata() const; 268 bool is_metaspace_object() const; // more specific test but slower 269 bool is_shared() const; 270 void print_address_on(outputStream* st) const; // nonvirtual address printing 271 272 #define METASPACE_OBJ_TYPES_DO(f) \ 273 f(Unknown) \ 274 f(Class) \ 275 f(Symbol) \ 276 f(TypeArrayU1) \ 277 f(TypeArrayU2) \ 278 f(TypeArrayU4) \ 279 f(TypeArrayU8) \ 280 f(TypeArrayOther) \ 281 f(Method) \ 282 f(ConstMethod) \ 283 f(MethodData) \ 284 f(ConstantPool) \ 285 f(ConstantPoolCache) \ 286 f(Annotation) \ 287 f(MethodCounters) 288 289 #define METASPACE_OBJ_TYPE_DECLARE(name) name ## Type, 290 #define METASPACE_OBJ_TYPE_NAME_CASE(name) case name ## Type: return #name; 291 292 enum Type { 293 // Types are MetaspaceObj::ClassType, MetaspaceObj::SymbolType, etc 294 METASPACE_OBJ_TYPES_DO(METASPACE_OBJ_TYPE_DECLARE) 295 _number_of_types 296 }; 297 298 static const char * type_name(Type type) { 299 switch(type) { 300 METASPACE_OBJ_TYPES_DO(METASPACE_OBJ_TYPE_NAME_CASE) 301 default: 302 ShouldNotReachHere(); 303 return NULL; 304 } 305 } 306 307 static MetaspaceObj::Type array_type(size_t elem_size) { 308 switch (elem_size) { 309 case 1: return TypeArrayU1Type; 310 case 2: return TypeArrayU2Type; 311 case 4: return TypeArrayU4Type; 312 case 8: return TypeArrayU8Type; 313 default: 314 return TypeArrayOtherType; 315 } 316 } 317 318 void* operator new(size_t size, ClassLoaderData* loader_data, 319 size_t word_size, bool read_only, 320 Type type, Thread* thread); 321 // can't use TRAPS from this header file. 322 void operator delete(void* p) { ShouldNotCallThis(); } 323 }; 324 325 // Base class for classes that constitute name spaces. 326 327 class AllStatic { 328 public: 329 AllStatic() { ShouldNotCallThis(); } 330 ~AllStatic() { ShouldNotCallThis(); } 331 }; 332 333 334 //------------------------------Chunk------------------------------------------ 335 // Linked list of raw memory chunks 336 class Chunk: CHeapObj<mtChunk> { 337 friend class VMStructs; 338 339 protected: 340 Chunk* _next; // Next Chunk in list 341 const size_t _len; // Size of this Chunk 342 public: 343 void* operator new(size_t size, size_t length); 344 void operator delete(void* p); 345 Chunk(size_t length); 346 347 enum { 348 // default sizes; make them slightly smaller than 2**k to guard against 349 // buddy-system style malloc implementations 350 #ifdef _LP64 351 slack = 40, // [RGV] Not sure if this is right, but make it 352 // a multiple of 8. 353 #else 354 slack = 20, // suspected sizeof(Chunk) + internal malloc headers 355 #endif 356 357 init_size = 1*K - slack, // Size of first chunk 358 medium_size= 10*K - slack, // Size of medium-sized chunk 359 size = 32*K - slack, // Default size of an Arena chunk (following the first) 360 non_pool_size = init_size + 32 // An initial size which is not one of above 361 }; 362 363 void chop(); // Chop this chunk 364 void next_chop(); // Chop next chunk 365 static size_t aligned_overhead_size(void) { return ARENA_ALIGN(sizeof(Chunk)); } 366 static size_t aligned_overhead_size(size_t byte_size) { return ARENA_ALIGN(byte_size); } 367 368 size_t length() const { return _len; } 369 Chunk* next() const { return _next; } 370 void set_next(Chunk* n) { _next = n; } 371 // Boundaries of data area (possibly unused) 372 char* bottom() const { return ((char*) this) + aligned_overhead_size(); } 373 char* top() const { return bottom() + _len; } 374 bool contains(char* p) const { return bottom() <= p && p <= top(); } 375 376 // Start the chunk_pool cleaner task 377 static void start_chunk_pool_cleaner_task(); 378 379 static void clean_chunk_pool(); 380 }; 381 382 //------------------------------Arena------------------------------------------ 383 // Fast allocation of memory 384 class Arena : public CHeapObj<mtNone|otArena> { 385 protected: 386 friend class ResourceMark; 387 friend class HandleMark; 388 friend class NoHandleMark; 389 friend class VMStructs; 390 391 Chunk *_first; // First chunk 392 Chunk *_chunk; // current chunk 393 char *_hwm, *_max; // High water mark and max in current chunk 394 // Get a new Chunk of at least size x 395 void* grow(size_t x, AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM); 396 size_t _size_in_bytes; // Size of arena (used for native memory tracking) 397 398 NOT_PRODUCT(static julong _bytes_allocated;) // total #bytes allocated since start 399 friend class AllocStats; 400 debug_only(void* malloc(size_t size);) 401 debug_only(void* internal_malloc_4(size_t x);) 402 NOT_PRODUCT(void inc_bytes_allocated(size_t x);) 403 404 void signal_out_of_memory(size_t request, const char* whence) const; 405 406 void check_for_overflow(size_t request, const char* whence) const { 407 if (UINTPTR_MAX - request < (uintptr_t)_hwm) { 408 signal_out_of_memory(request, whence); 409 } 410 } 411 412 public: 413 Arena(); 414 Arena(size_t init_size); 415 ~Arena(); 416 void destruct_contents(); 417 char* hwm() const { return _hwm; } 418 419 // new operators 420 void* operator new (size_t size); 421 void* operator new (size_t size, const std::nothrow_t& nothrow_constant); 422 423 // dynamic memory type tagging 424 void* operator new(size_t size, MEMFLAGS flags); 425 void* operator new(size_t size, const std::nothrow_t& nothrow_constant, MEMFLAGS flags); 426 void operator delete(void* p); 427 428 // Fast allocate in the arena. Common case is: pointer test + increment. 429 void* Amalloc(size_t x, AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM) { 430 assert(is_power_of_2(ARENA_AMALLOC_ALIGNMENT) , "should be a power of 2"); 431 x = ARENA_ALIGN(x); 432 debug_only(if (UseMallocOnly) return malloc(x);) 433 check_for_overflow(x, "Arena::Amalloc"); 434 NOT_PRODUCT(inc_bytes_allocated(x);) 435 if (_hwm + x > _max) { 436 return grow(x, alloc_failmode); 437 } else { 438 char *old = _hwm; 439 _hwm += x; 440 return old; 441 } 442 } 443 // Further assume size is padded out to words 444 void *Amalloc_4(size_t x, AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM) { 445 assert( (x&(sizeof(char*)-1)) == 0, "misaligned size" ); 446 debug_only(if (UseMallocOnly) return malloc(x);) 447 check_for_overflow(x, "Arena::Amalloc_4"); 448 NOT_PRODUCT(inc_bytes_allocated(x);) 449 if (_hwm + x > _max) { 450 return grow(x, alloc_failmode); 451 } else { 452 char *old = _hwm; 453 _hwm += x; 454 return old; 455 } 456 } 457 458 // Allocate with 'double' alignment. It is 8 bytes on sparc. 459 // In other cases Amalloc_D() should be the same as Amalloc_4(). 460 void* Amalloc_D(size_t x, AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM) { 461 assert( (x&(sizeof(char*)-1)) == 0, "misaligned size" ); 462 debug_only(if (UseMallocOnly) return malloc(x);) 463 #if defined(SPARC) && !defined(_LP64) 464 #define DALIGN_M1 7 465 size_t delta = (((size_t)_hwm + DALIGN_M1) & ~DALIGN_M1) - (size_t)_hwm; 466 x += delta; 467 #endif 468 check_for_overflow(x, "Arena::Amalloc_D"); 469 NOT_PRODUCT(inc_bytes_allocated(x);) 470 if (_hwm + x > _max) { 471 return grow(x, alloc_failmode); // grow() returns a result aligned >= 8 bytes. 472 } else { 473 char *old = _hwm; 474 _hwm += x; 475 #if defined(SPARC) && !defined(_LP64) 476 old += delta; // align to 8-bytes 477 #endif 478 return old; 479 } 480 } 481 482 // Fast delete in area. Common case is: NOP (except for storage reclaimed) 483 void Afree(void *ptr, size_t size) { 484 #ifdef ASSERT 485 if (ZapResourceArea) memset(ptr, badResourceValue, size); // zap freed memory 486 if (UseMallocOnly) return; 487 #endif 488 if (((char*)ptr) + size == _hwm) _hwm = (char*)ptr; 489 } 490 491 void *Arealloc( void *old_ptr, size_t old_size, size_t new_size, 492 AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM); 493 494 // Move contents of this arena into an empty arena 495 Arena *move_contents(Arena *empty_arena); 496 497 // Determine if pointer belongs to this Arena or not. 498 bool contains( const void *ptr ) const; 499 500 // Total of all chunks in use (not thread-safe) 501 size_t used() const; 502 503 // Total # of bytes used 504 size_t size_in_bytes() const { return _size_in_bytes; }; 505 void set_size_in_bytes(size_t size); 506 507 static void free_malloced_objects(Chunk* chunk, char* hwm, char* max, char* hwm2) PRODUCT_RETURN; 508 static void free_all(char** start, char** end) PRODUCT_RETURN; 509 510 // how many arena instances 511 NOT_PRODUCT(static volatile jint _instance_count;) 512 private: 513 // Reset this Arena to empty, access will trigger grow if necessary 514 void reset(void) { 515 _first = _chunk = NULL; 516 _hwm = _max = NULL; 517 set_size_in_bytes(0); 518 } 519 }; 520 521 // One of the following macros must be used when allocating 522 // an array or object from an arena 523 #define NEW_ARENA_ARRAY(arena, type, size) \ 524 (type*) (arena)->Amalloc((size) * sizeof(type)) 525 526 #define REALLOC_ARENA_ARRAY(arena, type, old, old_size, new_size) \ 527 (type*) (arena)->Arealloc((char*)(old), (old_size) * sizeof(type), \ 528 (new_size) * sizeof(type) ) 529 530 #define FREE_ARENA_ARRAY(arena, type, old, size) \ 531 (arena)->Afree((char*)(old), (size) * sizeof(type)) 532 533 #define NEW_ARENA_OBJ(arena, type) \ 534 NEW_ARENA_ARRAY(arena, type, 1) 535 536 537 //%note allocation_1 538 extern char* resource_allocate_bytes(size_t size, 539 AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM); 540 extern char* resource_allocate_bytes(Thread* thread, size_t size, 541 AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM); 542 extern char* resource_reallocate_bytes( char *old, size_t old_size, size_t new_size, 543 AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM); 544 extern void resource_free_bytes( char *old, size_t size ); 545 546 //---------------------------------------------------------------------- 547 // Base class for objects allocated in the resource area per default. 548 // Optionally, objects may be allocated on the C heap with 549 // new(ResourceObj::C_HEAP) Foo(...) or in an Arena with new (&arena) 550 // ResourceObj's can be allocated within other objects, but don't use 551 // new or delete (allocation_type is unknown). If new is used to allocate, 552 // use delete to deallocate. 553 class ResourceObj ALLOCATION_SUPER_CLASS_SPEC { 554 public: 555 enum allocation_type { STACK_OR_EMBEDDED = 0, RESOURCE_AREA, C_HEAP, ARENA, allocation_mask = 0x3 }; 556 static void set_allocation_type(address res, allocation_type type) NOT_DEBUG_RETURN; 557 #ifdef ASSERT 558 private: 559 // When this object is allocated on stack the new() operator is not 560 // called but garbage on stack may look like a valid allocation_type. 561 // Store negated 'this' pointer when new() is called to distinguish cases. 562 // Use second array's element for verification value to distinguish garbage. 563 uintptr_t _allocation_t[2]; 564 bool is_type_set() const; 565 public: 566 allocation_type get_allocation_type() const; 567 bool allocated_on_stack() const { return get_allocation_type() == STACK_OR_EMBEDDED; } 568 bool allocated_on_res_area() const { return get_allocation_type() == RESOURCE_AREA; } 569 bool allocated_on_C_heap() const { return get_allocation_type() == C_HEAP; } 570 bool allocated_on_arena() const { return get_allocation_type() == ARENA; } 571 ResourceObj(); // default construtor 572 ResourceObj(const ResourceObj& r); // default copy construtor 573 ResourceObj& operator=(const ResourceObj& r); // default copy assignment 574 ~ResourceObj(); 575 #endif // ASSERT 576 577 public: 578 void* operator new(size_t size, allocation_type type, MEMFLAGS flags); 579 void* operator new [](size_t size, allocation_type type, MEMFLAGS flags); 580 void* operator new(size_t size, const std::nothrow_t& nothrow_constant, 581 allocation_type type, MEMFLAGS flags); 582 void* operator new [](size_t size, const std::nothrow_t& nothrow_constant, 583 allocation_type type, MEMFLAGS flags); 584 585 void* operator new(size_t size, Arena *arena) { 586 address res = (address)arena->Amalloc(size); 587 DEBUG_ONLY(set_allocation_type(res, ARENA);) 588 return res; 589 } 590 591 void* operator new [](size_t size, Arena *arena) { 592 address res = (address)arena->Amalloc(size); 593 DEBUG_ONLY(set_allocation_type(res, ARENA);) 594 return res; 595 } 596 597 void* operator new(size_t size) { 598 address res = (address)resource_allocate_bytes(size); 599 DEBUG_ONLY(set_allocation_type(res, RESOURCE_AREA);) 600 return res; 601 } 602 603 void* operator new(size_t size, const std::nothrow_t& nothrow_constant) { 604 address res = (address)resource_allocate_bytes(size, AllocFailStrategy::RETURN_NULL); 605 DEBUG_ONLY(if (res != NULL) set_allocation_type(res, RESOURCE_AREA);) 606 return res; 607 } 608 609 void* operator new [](size_t size) { 610 address res = (address)resource_allocate_bytes(size); 611 DEBUG_ONLY(set_allocation_type(res, RESOURCE_AREA);) 612 return res; 613 } 614 615 void* operator new [](size_t size, const std::nothrow_t& nothrow_constant) { 616 address res = (address)resource_allocate_bytes(size, AllocFailStrategy::RETURN_NULL); 617 DEBUG_ONLY(if (res != NULL) set_allocation_type(res, RESOURCE_AREA);) 618 return res; 619 } 620 621 void operator delete(void* p); 622 void operator delete [](void* p); 623 }; 624 625 // One of the following macros must be used when allocating an array 626 // or object to determine whether it should reside in the C heap on in 627 // the resource area. 628 629 #define NEW_RESOURCE_ARRAY(type, size)\ 630 (type*) resource_allocate_bytes((size) * sizeof(type)) 631 632 #define NEW_RESOURCE_ARRAY_RETURN_NULL(type, size)\ 633 (type*) resource_allocate_bytes((size) * sizeof(type), AllocFailStrategy::RETURN_NULL) 634 635 #define NEW_RESOURCE_ARRAY_IN_THREAD(thread, type, size)\ 636 (type*) resource_allocate_bytes(thread, (size) * sizeof(type)) 637 638 #define REALLOC_RESOURCE_ARRAY(type, old, old_size, new_size)\ 639 (type*) resource_reallocate_bytes((char*)(old), (old_size) * sizeof(type), (new_size) * sizeof(type) ) 640 641 #define FREE_RESOURCE_ARRAY(type, old, size)\ 642 resource_free_bytes((char*)(old), (size) * sizeof(type)) 643 644 #define FREE_FAST(old)\ 645 /* nop */ 646 647 #define NEW_RESOURCE_OBJ(type)\ 648 NEW_RESOURCE_ARRAY(type, 1) 649 650 #define NEW_C_HEAP_ARRAY(type, size, memflags)\ 651 (type*) (AllocateHeap((size) * sizeof(type), memflags)) 652 653 #define REALLOC_C_HEAP_ARRAY(type, old, size, memflags)\ 654 (type*) (ReallocateHeap((char*)old, (size) * sizeof(type), memflags)) 655 656 #define FREE_C_HEAP_ARRAY(type, old, memflags) \ 657 FreeHeap((char*)(old), memflags) 658 659 #define NEW_C_HEAP_ARRAY2(type, size, memflags, pc)\ 660 (type*) (AllocateHeap((size) * sizeof(type), memflags, pc)) 661 662 #define REALLOC_C_HEAP_ARRAY2(type, old, size, memflags, pc)\ 663 (type*) (ReallocateHeap((char*)old, (size) * sizeof(type), memflags, pc)) 664 665 #define NEW_C_HEAP_ARRAY3(type, size, memflags, pc, allocfail) \ 666 (type*) AllocateHeap(size * sizeof(type), memflags, pc, allocfail) 667 668 // allocate type in heap without calling ctor 669 #define NEW_C_HEAP_OBJ(type, memflags)\ 670 NEW_C_HEAP_ARRAY(type, 1, memflags) 671 672 // deallocate obj of type in heap without calling dtor 673 #define FREE_C_HEAP_OBJ(objname, memflags)\ 674 FreeHeap((char*)objname, memflags); 675 676 // for statistics 677 #ifndef PRODUCT 678 class AllocStats : StackObj { 679 julong start_mallocs, start_frees; 680 julong start_malloc_bytes, start_mfree_bytes, start_res_bytes; 681 public: 682 AllocStats(); 683 684 julong num_mallocs(); // since creation of receiver 685 julong alloc_bytes(); 686 julong num_frees(); 687 julong free_bytes(); 688 julong resource_bytes(); 689 void print(); 690 }; 691 #endif 692 693 694 //------------------------------ReallocMark--------------------------------- 695 // Code which uses REALLOC_RESOURCE_ARRAY should check an associated 696 // ReallocMark, which is declared in the same scope as the reallocated 697 // pointer. Any operation that could __potentially__ cause a reallocation 698 // should check the ReallocMark. 699 class ReallocMark: public StackObj { 700 protected: 701 NOT_PRODUCT(int _nesting;) 702 703 public: 704 ReallocMark() PRODUCT_RETURN; 705 void check() PRODUCT_RETURN; 706 }; 707 708 // Helper class to allocate arrays that may become large. 709 // Uses the OS malloc for allocations smaller than ArrayAllocatorMallocLimit 710 // and uses mapped memory for larger allocations. 711 // Most OS mallocs do something similar but Solaris malloc does not revert 712 // to mapped memory for large allocations. By default ArrayAllocatorMallocLimit 713 // is set so that we always use malloc except for Solaris where we set the 714 // limit to get mapped memory. 715 template <class E, MEMFLAGS F> 716 class ArrayAllocator : StackObj { 717 char* _addr; 718 bool _use_malloc; 719 size_t _size; 720 public: 721 ArrayAllocator() : _addr(NULL), _use_malloc(false), _size(0) { } 722 ~ArrayAllocator() { free(); } 723 E* allocate(size_t length); 724 void free(); 725 }; 726 727 #endif // SHARE_VM_MEMORY_ALLOCATION_HPP