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  private:
 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  private:
 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