1 /*
   2  * Copyright (c) 1997, 2014, 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)
 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  * Memory types
 137  */
 138 enum MemoryType {
 139   // Memory type by sub systems. It occupies lower byte.
 140   mtJavaHeap          = 0x00,  // Java heap
 141   mtClass             = 0x01,  // memory class for Java classes
 142   mtThread            = 0x02,  // memory for thread objects
 143   mtThreadStack       = 0x03,
 144   mtCode              = 0x04,  // memory for generated code
 145   mtGC                = 0x05,  // memory for GC
 146   mtCompiler          = 0x06,  // memory for compiler
 147   mtInternal          = 0x07,  // memory used by VM, but does not belong to
 148                                  // any of above categories, and not used for
 149                                  // native memory tracking
 150   mtOther             = 0x08,  // memory not used by VM
 151   mtSymbol            = 0x09,  // symbol
 152   mtNMT               = 0x0A,  // memory used by native memory tracking
 153   mtClassShared       = 0x0B,  // class data sharing
 154   mtChunk             = 0x0C,  // chunk that holds content of arenas
 155   mtTest              = 0x0D,  // Test type for verifying NMT
 156   mtTracing           = 0x0E,  // memory used for Tracing
 157   mtNone              = 0x0F,  // undefined
 158   mt_number_of_types  = 0x10   // number of memory types (mtDontTrack
 159                                  // is not included as validate type)
 160 };
 161 
 162 typedef MemoryType MEMFLAGS;
 163 
 164 
 165 #if INCLUDE_NMT
 166 
 167 extern bool NMT_track_callsite;
 168 
 169 #else
 170 
 171 const bool NMT_track_callsite = false;
 172 
 173 #endif // INCLUDE_NMT
 174 
 175 class NativeCallStack;
 176 
 177 
 178 template <MEMFLAGS F> class CHeapObj ALLOCATION_SUPER_CLASS_SPEC {
 179  public:
 180   _NOINLINE_ void* operator new(size_t size, const NativeCallStack& stack) throw();
 181   _NOINLINE_ void* operator new(size_t size) throw();
 182   _NOINLINE_ void* operator new (size_t size, const std::nothrow_t&  nothrow_constant,
 183                                const NativeCallStack& stack) throw();
 184   _NOINLINE_ void* operator new (size_t size, const std::nothrow_t&  nothrow_constant)
 185                                throw();
 186   _NOINLINE_ void* operator new [](size_t size, const NativeCallStack& stack) throw();
 187   _NOINLINE_ void* operator new [](size_t size) throw();
 188   _NOINLINE_ void* operator new [](size_t size, const std::nothrow_t&  nothrow_constant,
 189                                const NativeCallStack& stack) throw();
 190   _NOINLINE_ void* operator new [](size_t size, const std::nothrow_t&  nothrow_constant)
 191                                throw();
 192   void  operator delete(void* p);
 193   void  operator delete [] (void* p);
 194 };
 195 
 196 // Base class for objects allocated on the stack only.
 197 // Calling new or delete will result in fatal error.
 198 
 199 class StackObj ALLOCATION_SUPER_CLASS_SPEC {
 200  private:
 201   void* operator new(size_t size) throw();
 202   void* operator new [](size_t size) throw();
 203 #ifdef __IBMCPP__
 204  public:
 205 #endif
 206   void  operator delete(void* p);
 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) throw();
 231   void  operator delete(void* p);
 232   void* operator new [](size_t size) throw();
 233   void  operator delete [](void* p);
 234 };
 235 
 236 
 237 // Base class for objects stored in Metaspace.
 238 // Calling delete will result in fatal error.
 239 //
 240 // Do not inherit from something with a vptr because this class does
 241 // not introduce one.  This class is used to allocate both shared read-only
 242 // and shared read-write classes.
 243 //
 244 
 245 class ClassLoaderData;
 246 
 247 class MetaspaceObj {
 248  public:
 249   bool is_metaspace_object() const;
 250   bool is_shared() const;
 251   void print_address_on(outputStream* st) const;  // nonvirtual address printing
 252 
 253 #define METASPACE_OBJ_TYPES_DO(f) \
 254   f(Unknown) \
 255   f(Class) \
 256   f(Symbol) \
 257   f(TypeArrayU1) \
 258   f(TypeArrayU2) \
 259   f(TypeArrayU4) \
 260   f(TypeArrayU8) \
 261   f(TypeArrayOther) \
 262   f(Method) \
 263   f(ConstMethod) \
 264   f(MethodData) \
 265   f(ConstantPool) \
 266   f(ConstantPoolCache) \
 267   f(Annotation) \
 268   f(MethodCounters) \
 269   f(Deallocated)
 270 
 271 #define METASPACE_OBJ_TYPE_DECLARE(name) name ## Type,
 272 #define METASPACE_OBJ_TYPE_NAME_CASE(name) case name ## Type: return #name;
 273 
 274   enum Type {
 275     // Types are MetaspaceObj::ClassType, MetaspaceObj::SymbolType, etc
 276     METASPACE_OBJ_TYPES_DO(METASPACE_OBJ_TYPE_DECLARE)
 277     _number_of_types
 278   };
 279 
 280   static const char * type_name(Type type) {
 281     switch(type) {
 282     METASPACE_OBJ_TYPES_DO(METASPACE_OBJ_TYPE_NAME_CASE)
 283     default:
 284       ShouldNotReachHere();
 285       return NULL;
 286     }
 287   }
 288 
 289   static MetaspaceObj::Type array_type(size_t elem_size) {
 290     switch (elem_size) {
 291     case 1: return TypeArrayU1Type;
 292     case 2: return TypeArrayU2Type;
 293     case 4: return TypeArrayU4Type;
 294     case 8: return TypeArrayU8Type;
 295     default:
 296       return TypeArrayOtherType;
 297     }
 298   }
 299 
 300   void* operator new(size_t size, ClassLoaderData* loader_data,
 301                      size_t word_size, bool read_only,
 302                      Type type, Thread* thread) throw();
 303                      // can't use TRAPS from this header file.
 304   void operator delete(void* p) { ShouldNotCallThis(); }
 305 };
 306 
 307 // Base class for classes that constitute name spaces.
 308 
 309 class AllStatic {
 310  public:
 311   AllStatic()  { ShouldNotCallThis(); }
 312   ~AllStatic() { ShouldNotCallThis(); }
 313 };
 314 
 315 
 316 //------------------------------Chunk------------------------------------------
 317 // Linked list of raw memory chunks
 318 class Chunk: CHeapObj<mtChunk> {
 319   friend class VMStructs;
 320 
 321  protected:
 322   Chunk*       _next;     // Next Chunk in list
 323   const size_t _len;      // Size of this Chunk
 324  public:
 325   void* operator new(size_t size, AllocFailType alloc_failmode, size_t length) throw();
 326   void  operator delete(void* p);
 327   Chunk(size_t length);
 328 
 329   enum {
 330     // default sizes; make them slightly smaller than 2**k to guard against
 331     // buddy-system style malloc implementations
 332 #ifdef _LP64
 333     slack      = 40,            // [RGV] Not sure if this is right, but make it
 334                                 //       a multiple of 8.
 335 #else
 336     slack      = 20,            // suspected sizeof(Chunk) + internal malloc headers
 337 #endif
 338 
 339     tiny_size  =  256  - slack, // Size of first chunk (tiny)
 340     init_size  =  1*K  - slack, // Size of first chunk (normal aka small)
 341     medium_size= 10*K  - slack, // Size of medium-sized chunk
 342     size       = 32*K  - slack, // Default size of an Arena chunk (following the first)
 343     non_pool_size = init_size + 32 // An initial size which is not one of above
 344   };
 345 
 346   void chop();                  // Chop this chunk
 347   void next_chop();             // Chop next chunk
 348   static size_t aligned_overhead_size(void) { return ARENA_ALIGN(sizeof(Chunk)); }
 349   static size_t aligned_overhead_size(size_t byte_size) { return ARENA_ALIGN(byte_size); }
 350 
 351   size_t length() const         { return _len;  }
 352   Chunk* next() const           { return _next;  }
 353   void set_next(Chunk* n)       { _next = n;  }
 354   // Boundaries of data area (possibly unused)
 355   char* bottom() const          { return ((char*) this) + aligned_overhead_size();  }
 356   char* top()    const          { return bottom() + _len; }
 357   bool contains(char* p) const  { return bottom() <= p && p <= top(); }
 358 
 359   // Start the chunk_pool cleaner task
 360   static void start_chunk_pool_cleaner_task();
 361 
 362   static void clean_chunk_pool();
 363 };
 364 
 365 //------------------------------Arena------------------------------------------
 366 // Fast allocation of memory
 367 class Arena : public CHeapObj<mtNone> {
 368 protected:
 369   friend class ResourceMark;
 370   friend class HandleMark;
 371   friend class NoHandleMark;
 372   friend class VMStructs;
 373 
 374   MEMFLAGS    _flags;           // Memory tracking flags
 375 
 376   Chunk *_first;                // First chunk
 377   Chunk *_chunk;                // current chunk
 378   char *_hwm, *_max;            // High water mark and max in current chunk
 379   // Get a new Chunk of at least size x
 380   void* grow(size_t x, AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM);
 381   size_t _size_in_bytes;        // Size of arena (used for native memory tracking)
 382 
 383   NOT_PRODUCT(static julong _bytes_allocated;) // total #bytes allocated since start
 384   friend class AllocStats;
 385   debug_only(void* malloc(size_t size);)
 386   debug_only(void* internal_malloc_4(size_t x);)
 387   NOT_PRODUCT(void inc_bytes_allocated(size_t x);)
 388 
 389   void signal_out_of_memory(size_t request, const char* whence) const;
 390 
 391   bool check_for_overflow(size_t request, const char* whence,
 392       AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM) const {
 393     if (UINTPTR_MAX - request < (uintptr_t)_hwm) {
 394       if (alloc_failmode == AllocFailStrategy::RETURN_NULL) {
 395         return false;
 396       }
 397       signal_out_of_memory(request, whence);
 398     }
 399     return true;
 400  }
 401 
 402  public:
 403   Arena(MEMFLAGS memflag);
 404   Arena(MEMFLAGS memflag, size_t init_size);
 405   ~Arena();
 406   void  destruct_contents();
 407   char* hwm() const             { return _hwm; }
 408 
 409   // new operators
 410   void* operator new (size_t size) throw();
 411   void* operator new (size_t size, const std::nothrow_t& nothrow_constant) throw();
 412 
 413   // dynamic memory type tagging
 414   void* operator new(size_t size, MEMFLAGS flags) throw();
 415   void* operator new(size_t size, const std::nothrow_t& nothrow_constant, MEMFLAGS flags) throw();
 416   void  operator delete(void* p);
 417 
 418   // Fast allocate in the arena.  Common case is: pointer test + increment.
 419   void* Amalloc(size_t x, AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM) {
 420     assert(is_power_of_2(ARENA_AMALLOC_ALIGNMENT) , "should be a power of 2");
 421     x = ARENA_ALIGN(x);
 422     debug_only(if (UseMallocOnly) return malloc(x);)
 423     if (!check_for_overflow(x, "Arena::Amalloc", alloc_failmode))
 424       return NULL;
 425     NOT_PRODUCT(inc_bytes_allocated(x);)
 426     if (_hwm + x > _max) {
 427       return grow(x, alloc_failmode);
 428     } else {
 429       char *old = _hwm;
 430       _hwm += x;
 431       return old;
 432     }
 433   }
 434   // Further assume size is padded out to words
 435   void *Amalloc_4(size_t x, AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM) {
 436     assert( (x&(sizeof(char*)-1)) == 0, "misaligned size" );
 437     debug_only(if (UseMallocOnly) return malloc(x);)
 438     if (!check_for_overflow(x, "Arena::Amalloc_4", alloc_failmode))
 439       return NULL;
 440     NOT_PRODUCT(inc_bytes_allocated(x);)
 441     if (_hwm + x > _max) {
 442       return grow(x, alloc_failmode);
 443     } else {
 444       char *old = _hwm;
 445       _hwm += x;
 446       return old;
 447     }
 448   }
 449 
 450   // Allocate with 'double' alignment. It is 8 bytes on sparc.
 451   // In other cases Amalloc_D() should be the same as Amalloc_4().
 452   void* Amalloc_D(size_t x, AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM) {
 453     assert( (x&(sizeof(char*)-1)) == 0, "misaligned size" );
 454     debug_only(if (UseMallocOnly) return malloc(x);)
 455 #if defined(SPARC) && !defined(_LP64)
 456 #define DALIGN_M1 7
 457     size_t delta = (((size_t)_hwm + DALIGN_M1) & ~DALIGN_M1) - (size_t)_hwm;
 458     x += delta;
 459 #endif
 460     if (!check_for_overflow(x, "Arena::Amalloc_D", alloc_failmode))
 461       return NULL;
 462     NOT_PRODUCT(inc_bytes_allocated(x);)
 463     if (_hwm + x > _max) {
 464       return grow(x, alloc_failmode); // grow() returns a result aligned >= 8 bytes.
 465     } else {
 466       char *old = _hwm;
 467       _hwm += x;
 468 #if defined(SPARC) && !defined(_LP64)
 469       old += delta; // align to 8-bytes
 470 #endif
 471       return old;
 472     }
 473   }
 474 
 475   // Fast delete in area.  Common case is: NOP (except for storage reclaimed)
 476   void Afree(void *ptr, size_t size) {
 477 #ifdef ASSERT
 478     if (ZapResourceArea) memset(ptr, badResourceValue, size); // zap freed memory
 479     if (UseMallocOnly) return;
 480 #endif
 481     if (((char*)ptr) + size == _hwm) _hwm = (char*)ptr;
 482   }
 483 
 484   void *Arealloc( void *old_ptr, size_t old_size, size_t new_size,
 485       AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM);
 486 
 487   // Move contents of this arena into an empty arena
 488   Arena *move_contents(Arena *empty_arena);
 489 
 490   // Determine if pointer belongs to this Arena or not.
 491   bool contains( const void *ptr ) const;
 492 
 493   // Total of all chunks in use (not thread-safe)
 494   size_t used() const;
 495 
 496   // Total # of bytes used
 497   size_t size_in_bytes() const         {  return _size_in_bytes; };
 498   void set_size_in_bytes(size_t size);
 499 
 500   static void free_malloced_objects(Chunk* chunk, char* hwm, char* max, char* hwm2)  PRODUCT_RETURN;
 501   static void free_all(char** start, char** end)                                     PRODUCT_RETURN;
 502 
 503 private:
 504   // Reset this Arena to empty, access will trigger grow if necessary
 505   void   reset(void) {
 506     _first = _chunk = NULL;
 507     _hwm = _max = NULL;
 508     set_size_in_bytes(0);
 509   }
 510 };
 511 
 512 // One of the following macros must be used when allocating
 513 // an array or object from an arena
 514 #define NEW_ARENA_ARRAY(arena, type, size) \
 515   (type*) (arena)->Amalloc((size) * sizeof(type))
 516 
 517 #define REALLOC_ARENA_ARRAY(arena, type, old, old_size, new_size)    \
 518   (type*) (arena)->Arealloc((char*)(old), (old_size) * sizeof(type), \
 519                             (new_size) * sizeof(type) )
 520 
 521 #define FREE_ARENA_ARRAY(arena, type, old, size) \
 522   (arena)->Afree((char*)(old), (size) * sizeof(type))
 523 
 524 #define NEW_ARENA_OBJ(arena, type) \
 525   NEW_ARENA_ARRAY(arena, type, 1)
 526 
 527 
 528 //%note allocation_1
 529 extern char* resource_allocate_bytes(size_t size,
 530     AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM);
 531 extern char* resource_allocate_bytes(Thread* thread, size_t size,
 532     AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM);
 533 extern char* resource_reallocate_bytes( char *old, size_t old_size, size_t new_size,
 534     AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM);
 535 extern void resource_free_bytes( char *old, size_t size );
 536 
 537 //----------------------------------------------------------------------
 538 // Base class for objects allocated in the resource area per default.
 539 // Optionally, objects may be allocated on the C heap with
 540 // new(ResourceObj::C_HEAP) Foo(...) or in an Arena with new (&arena)
 541 // ResourceObj's can be allocated within other objects, but don't use
 542 // new or delete (allocation_type is unknown).  If new is used to allocate,
 543 // use delete to deallocate.
 544 class ResourceObj ALLOCATION_SUPER_CLASS_SPEC {
 545  public:
 546   enum allocation_type { STACK_OR_EMBEDDED = 0, RESOURCE_AREA, C_HEAP, ARENA, allocation_mask = 0x3 };
 547   static void set_allocation_type(address res, allocation_type type) NOT_DEBUG_RETURN;
 548 #ifdef ASSERT
 549  private:
 550   // When this object is allocated on stack the new() operator is not
 551   // called but garbage on stack may look like a valid allocation_type.
 552   // Store negated 'this' pointer when new() is called to distinguish cases.
 553   // Use second array's element for verification value to distinguish garbage.
 554   uintptr_t _allocation_t[2];
 555   bool is_type_set() const;
 556  public:
 557   allocation_type get_allocation_type() const;
 558   bool allocated_on_stack()    const { return get_allocation_type() == STACK_OR_EMBEDDED; }
 559   bool allocated_on_res_area() const { return get_allocation_type() == RESOURCE_AREA; }
 560   bool allocated_on_C_heap()   const { return get_allocation_type() == C_HEAP; }
 561   bool allocated_on_arena()    const { return get_allocation_type() == ARENA; }
 562   ResourceObj(); // default constructor
 563   ResourceObj(const ResourceObj& r); // default copy constructor
 564   ResourceObj& operator=(const ResourceObj& r); // default copy assignment
 565   ~ResourceObj();
 566 #endif // ASSERT
 567 
 568  public:
 569   void* operator new(size_t size, allocation_type type, MEMFLAGS flags) throw();
 570   void* operator new [](size_t size, allocation_type type, MEMFLAGS flags) throw();
 571   void* operator new(size_t size, const std::nothrow_t&  nothrow_constant,
 572       allocation_type type, MEMFLAGS flags) throw();
 573   void* operator new [](size_t size, const std::nothrow_t&  nothrow_constant,
 574       allocation_type type, MEMFLAGS flags) throw();
 575 
 576   void* operator new(size_t size, Arena *arena) throw() {
 577       address res = (address)arena->Amalloc(size);
 578       DEBUG_ONLY(set_allocation_type(res, ARENA);)
 579       return res;
 580   }
 581 
 582   void* operator new [](size_t size, Arena *arena) throw() {
 583       address res = (address)arena->Amalloc(size);
 584       DEBUG_ONLY(set_allocation_type(res, ARENA);)
 585       return res;
 586   }
 587 
 588   void* operator new(size_t size) throw() {
 589       address res = (address)resource_allocate_bytes(size);
 590       DEBUG_ONLY(set_allocation_type(res, RESOURCE_AREA);)
 591       return res;
 592   }
 593 
 594   void* operator new(size_t size, const std::nothrow_t& nothrow_constant) throw() {
 595       address res = (address)resource_allocate_bytes(size, AllocFailStrategy::RETURN_NULL);
 596       DEBUG_ONLY(if (res != NULL) set_allocation_type(res, RESOURCE_AREA);)
 597       return res;
 598   }
 599 
 600   void* operator new [](size_t size) throw() {
 601       address res = (address)resource_allocate_bytes(size);
 602       DEBUG_ONLY(set_allocation_type(res, RESOURCE_AREA);)
 603       return res;
 604   }
 605 
 606   void* operator new [](size_t size, const std::nothrow_t& nothrow_constant) throw() {
 607       address res = (address)resource_allocate_bytes(size, AllocFailStrategy::RETURN_NULL);
 608       DEBUG_ONLY(if (res != NULL) set_allocation_type(res, RESOURCE_AREA);)
 609       return res;
 610   }
 611 
 612   void  operator delete(void* p);
 613   void  operator delete [](void* p);
 614 };
 615 
 616 // One of the following macros must be used when allocating an array
 617 // or object to determine whether it should reside in the C heap on in
 618 // the resource area.
 619 
 620 #define NEW_RESOURCE_ARRAY(type, size)\
 621   (type*) resource_allocate_bytes((size) * sizeof(type))
 622 
 623 #define NEW_RESOURCE_ARRAY_RETURN_NULL(type, size)\
 624   (type*) resource_allocate_bytes((size) * sizeof(type), AllocFailStrategy::RETURN_NULL)
 625 
 626 #define NEW_RESOURCE_ARRAY_IN_THREAD(thread, type, size)\
 627   (type*) resource_allocate_bytes(thread, (size) * sizeof(type))
 628 
 629 #define NEW_RESOURCE_ARRAY_IN_THREAD_RETURN_NULL(thread, type, size)\
 630   (type*) resource_allocate_bytes(thread, (size) * sizeof(type), AllocFailStrategy::RETURN_NULL)
 631 
 632 #define REALLOC_RESOURCE_ARRAY(type, old, old_size, new_size)\
 633   (type*) resource_reallocate_bytes((char*)(old), (old_size) * sizeof(type), (new_size) * sizeof(type))
 634 
 635 #define REALLOC_RESOURCE_ARRAY_RETURN_NULL(type, old, old_size, new_size)\
 636   (type*) resource_reallocate_bytes((char*)(old), (old_size) * sizeof(type),\
 637                                     (new_size) * sizeof(type), AllocFailStrategy::RETURN_NULL)
 638 
 639 #define FREE_RESOURCE_ARRAY(type, old, size)\
 640   resource_free_bytes((char*)(old), (size) * sizeof(type))
 641 
 642 #define FREE_FAST(old)\
 643     /* nop */
 644 
 645 #define NEW_RESOURCE_OBJ(type)\
 646   NEW_RESOURCE_ARRAY(type, 1)
 647 
 648 #define NEW_RESOURCE_OBJ_RETURN_NULL(type)\
 649   NEW_RESOURCE_ARRAY_RETURN_NULL(type, 1)
 650 
 651 #define NEW_C_HEAP_ARRAY3(type, size, memflags, pc, allocfail)\
 652   (type*) AllocateHeap((size) * sizeof(type), memflags, pc, allocfail)
 653 
 654 #define NEW_C_HEAP_ARRAY2(type, size, memflags, pc)\
 655   (type*) (AllocateHeap((size) * sizeof(type), memflags, pc))
 656 
 657 #define NEW_C_HEAP_ARRAY(type, size, memflags)\
 658   (type*) (AllocateHeap((size) * sizeof(type), memflags))
 659 
 660 #define NEW_C_HEAP_ARRAY2_RETURN_NULL(type, size, memflags, pc)\
 661   NEW_C_HEAP_ARRAY3(type, (size), memflags, pc, AllocFailStrategy::RETURN_NULL)
 662 
 663 #define NEW_C_HEAP_ARRAY_RETURN_NULL(type, size, memflags)\
 664   NEW_C_HEAP_ARRAY3(type, (size), memflags, CURRENT_PC, AllocFailStrategy::RETURN_NULL)
 665 
 666 #define REALLOC_C_HEAP_ARRAY(type, old, size, memflags)\
 667   (type*) (ReallocateHeap((char*)(old), (size) * sizeof(type), memflags))
 668 
 669 #define REALLOC_C_HEAP_ARRAY_RETURN_NULL(type, old, size, memflags)\
 670   (type*) (ReallocateHeap((char*)(old), (size) * sizeof(type), memflags, AllocFailStrategy::RETURN_NULL))
 671 
 672 #define FREE_C_HEAP_ARRAY(type, old) \
 673   FreeHeap((char*)(old))
 674 
 675 // allocate type in heap without calling ctor
 676 #define NEW_C_HEAP_OBJ(type, memflags)\
 677   NEW_C_HEAP_ARRAY(type, 1, memflags)
 678 
 679 #define NEW_C_HEAP_OBJ_RETURN_NULL(type, memflags)\
 680   NEW_C_HEAP_ARRAY_RETURN_NULL(type, 1, memflags)
 681 
 682 // deallocate obj of type in heap without calling dtor
 683 #define FREE_C_HEAP_OBJ(objname)\
 684   FreeHeap((char*)objname);
 685 
 686 // for statistics
 687 #ifndef PRODUCT
 688 class AllocStats : StackObj {
 689   julong start_mallocs, start_frees;
 690   julong start_malloc_bytes, start_mfree_bytes, start_res_bytes;
 691  public:
 692   AllocStats();
 693 
 694   julong num_mallocs();    // since creation of receiver
 695   julong alloc_bytes();
 696   julong num_frees();
 697   julong free_bytes();
 698   julong resource_bytes();
 699   void   print();
 700 };
 701 #endif
 702 
 703 
 704 //------------------------------ReallocMark---------------------------------
 705 // Code which uses REALLOC_RESOURCE_ARRAY should check an associated
 706 // ReallocMark, which is declared in the same scope as the reallocated
 707 // pointer.  Any operation that could __potentially__ cause a reallocation
 708 // should check the ReallocMark.
 709 class ReallocMark: public StackObj {
 710 protected:
 711   NOT_PRODUCT(int _nesting;)
 712 
 713 public:
 714   ReallocMark()   PRODUCT_RETURN;
 715   void check()    PRODUCT_RETURN;
 716 };
 717 
 718 // Helper class to allocate arrays that may become large.
 719 // Uses the OS malloc for allocations smaller than ArrayAllocatorMallocLimit
 720 // and uses mapped memory for larger allocations.
 721 // Most OS mallocs do something similar but Solaris malloc does not revert
 722 // to mapped memory for large allocations. By default ArrayAllocatorMallocLimit
 723 // is set so that we always use malloc except for Solaris where we set the
 724 // limit to get mapped memory.
 725 template <class E, MEMFLAGS F>
 726 class ArrayAllocator VALUE_OBJ_CLASS_SPEC {
 727   char* _addr;
 728   bool _use_malloc;
 729   size_t _size;
 730   bool _free_in_destructor;
 731 
 732   static bool should_use_malloc(size_t size) {
 733     return size < ArrayAllocatorMallocLimit;
 734   }
 735 
 736   static char* allocate_inner(size_t& size, bool& use_malloc);
 737  public:
 738   ArrayAllocator(bool free_in_destructor = true) :
 739     _addr(NULL), _use_malloc(false), _size(0), _free_in_destructor(free_in_destructor) { }
 740 
 741   ~ArrayAllocator() {
 742     if (_free_in_destructor) {
 743       free();
 744     }
 745   }
 746 
 747   E* allocate(size_t length);
 748   E* reallocate(size_t new_length);
 749   void free();
 750 };
 751 
 752 #endif // SHARE_VM_MEMORY_ALLOCATION_HPP