1 /*
   2  * Copyright (c) 1997, 2016, 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 class AllocFailStrategy {
  45 public:
  46   enum AllocFailEnum { EXIT_OOM, RETURN_NULL };
  47 };
  48 typedef AllocFailStrategy::AllocFailEnum AllocFailType;
  49 
  50 // All classes in the virtual machine must be subclassed
  51 // by one of the following allocation classes:
  52 //
  53 // For objects allocated in the resource area (see resourceArea.hpp).
  54 // - ResourceObj
  55 //
  56 // For objects allocated in the C-heap (managed by: free & malloc).
  57 // - CHeapObj
  58 //
  59 // For objects allocated on the stack.
  60 // - StackObj
  61 //
  62 // For embedded objects.
  63 // - ValueObj
  64 //
  65 // For classes used as name spaces.
  66 // - AllStatic
  67 //
  68 // For classes in Metaspace (class data)
  69 // - MetaspaceObj
  70 //
  71 // The printable subclasses are used for debugging and define virtual
  72 // member functions for printing. Classes that avoid allocating the
  73 // vtbl entries in the objects should therefore not be the printable
  74 // subclasses.
  75 //
  76 // The following macros and function should be used to allocate memory
  77 // directly in the resource area or in the C-heap, The _OBJ variants
  78 // of the NEW/FREE_C_HEAP macros are used for alloc/dealloc simple
  79 // objects which are not inherited from CHeapObj, note constructor and
  80 // destructor are not called. The preferable way to allocate objects
  81 // is using the new operator.
  82 //
  83 // WARNING: The array variant must only be used for a homogenous array
  84 // where all objects are of the exact type specified. If subtypes are
  85 // stored in the array then must pay attention to calling destructors
  86 // at needed.
  87 //
  88 //   NEW_RESOURCE_ARRAY(type, size)
  89 //   NEW_RESOURCE_OBJ(type)
  90 //   NEW_C_HEAP_ARRAY(type, size)
  91 //   NEW_C_HEAP_OBJ(type, memflags)
  92 //   FREE_C_HEAP_ARRAY(type, old)
  93 //   FREE_C_HEAP_OBJ(objname, type, memflags)
  94 //   char* AllocateHeap(size_t size, const char* name);
  95 //   void  FreeHeap(void* p);
  96 //
  97 // C-heap allocation can be traced using +PrintHeapAllocation.
  98 // malloc and free should therefore never called directly.
  99 
 100 // Base class for objects allocated in the C-heap.
 101 
 102 // In non product mode we introduce a super class for all allocation classes
 103 // that supports printing.
 104 // We avoid the superclass in product mode since some C++ compilers add
 105 // a word overhead for empty super classes.
 106 
 107 #ifdef PRODUCT
 108 #define ALLOCATION_SUPER_CLASS_SPEC
 109 #else
 110 #define ALLOCATION_SUPER_CLASS_SPEC : public AllocatedObj
 111 class AllocatedObj {
 112  public:
 113   // Printing support
 114   void print() const;
 115   void print_value() const;
 116 
 117   virtual void print_on(outputStream* st) const;
 118   virtual void print_value_on(outputStream* st) const;
 119 };
 120 #endif
 121 
 122 
 123 /*
 124  * Memory types
 125  */
 126 enum MemoryType {
 127   // Memory type by sub systems. It occupies lower byte.
 128   mtJavaHeap          = 0x00,  // Java heap
 129   mtClass             = 0x01,  // memory class for Java classes
 130   mtThread            = 0x02,  // memory for thread objects
 131   mtThreadStack       = 0x03,
 132   mtCode              = 0x04,  // memory for generated code
 133   mtGC                = 0x05,  // memory for GC
 134   mtCompiler          = 0x06,  // memory for compiler
 135   mtInternal          = 0x07,  // memory used by VM, but does not belong to
 136                                  // any of above categories, and not used for
 137                                  // native memory tracking
 138   mtOther             = 0x08,  // memory not used by VM
 139   mtSymbol            = 0x09,  // symbol
 140   mtNMT               = 0x0A,  // memory used by native memory tracking
 141   mtClassShared       = 0x0B,  // class data sharing
 142   mtChunk             = 0x0C,  // chunk that holds content of arenas
 143   mtTest              = 0x0D,  // Test type for verifying NMT
 144   mtTracing           = 0x0E,  // memory used for Tracing
 145   mtLogging           = 0x0F,  // memory for logging
 146   mtArguments         = 0x10,  // memory for argument processing
 147   mtModule            = 0x11,  // memory for module processing
 148   mtNone              = 0x12,  // undefined
 149   mt_number_of_types  = 0x13   // number of memory types (mtDontTrack
 150                                  // is not included as validate type)
 151 };
 152 
 153 typedef MemoryType MEMFLAGS;
 154 
 155 
 156 #if INCLUDE_NMT
 157 
 158 extern bool NMT_track_callsite;
 159 
 160 #else
 161 
 162 const bool NMT_track_callsite = false;
 163 
 164 #endif // INCLUDE_NMT
 165 
 166 class NativeCallStack;
 167 
 168 
 169 template <MEMFLAGS F> class CHeapObj ALLOCATION_SUPER_CLASS_SPEC {
 170  public:
 171   NOINLINE void* operator new(size_t size, const NativeCallStack& stack) throw();
 172   NOINLINE void* operator new(size_t size) throw();
 173   NOINLINE void* operator new (size_t size, const std::nothrow_t&  nothrow_constant,
 174                                const NativeCallStack& stack) throw();
 175   NOINLINE void* operator new (size_t size, const std::nothrow_t&  nothrow_constant)
 176                                throw();
 177   NOINLINE void* operator new [](size_t size, const NativeCallStack& stack) throw();
 178   NOINLINE void* operator new [](size_t size) throw();
 179   NOINLINE void* operator new [](size_t size, const std::nothrow_t&  nothrow_constant,
 180                                const NativeCallStack& stack) throw();
 181   NOINLINE void* operator new [](size_t size, const std::nothrow_t&  nothrow_constant)
 182                                throw();
 183   void  operator delete(void* p);
 184   void  operator delete [] (void* p);
 185 };
 186 
 187 // Base class for objects allocated on the stack only.
 188 // Calling new or delete will result in fatal error.
 189 
 190 class StackObj ALLOCATION_SUPER_CLASS_SPEC {
 191  private:
 192   void* operator new(size_t size) throw();
 193   void* operator new [](size_t size) throw();
 194 #ifdef __IBMCPP__
 195  public:
 196 #endif
 197   void  operator delete(void* p);
 198   void  operator delete [](void* p);
 199 };
 200 
 201 // Base class for objects used as value objects.
 202 // Calling new or delete will result in fatal error.
 203 //
 204 // Portability note: Certain compilers (e.g. gcc) will
 205 // always make classes bigger if it has a superclass, even
 206 // if the superclass does not have any virtual methods or
 207 // instance fields. The HotSpot implementation relies on this
 208 // not to happen. So never make a ValueObj class a direct subclass
 209 // of this object, but use the VALUE_OBJ_CLASS_SPEC class instead, e.g.,
 210 // like this:
 211 //
 212 //   class A VALUE_OBJ_CLASS_SPEC {
 213 //     ...
 214 //   }
 215 //
 216 // With gcc and possible other compilers the VALUE_OBJ_CLASS_SPEC can
 217 // be defined as a an empty string "".
 218 //
 219 class _ValueObj {
 220  private:
 221   void* operator new(size_t size) throw();
 222   void  operator delete(void* p);
 223   void* operator new [](size_t size) throw();
 224   void  operator delete [](void* p);
 225 };
 226 
 227 
 228 // Base class for objects stored in Metaspace.
 229 // Calling delete will result in fatal error.
 230 //
 231 // Do not inherit from something with a vptr because this class does
 232 // not introduce one.  This class is used to allocate both shared read-only
 233 // and shared read-write classes.
 234 //
 235 
 236 class ClassLoaderData;
 237 
 238 class MetaspaceObj {
 239  public:
 240   bool is_metaspace_object() const;
 241   bool is_shared() const;
 242   void print_address_on(outputStream* st) const;  // nonvirtual address printing
 243 
 244 #define METASPACE_OBJ_TYPES_DO(f) \
 245   f(Unknown) \
 246   f(Class) \
 247   f(Symbol) \
 248   f(TypeArrayU1) \
 249   f(TypeArrayU2) \
 250   f(TypeArrayU4) \
 251   f(TypeArrayU8) \
 252   f(TypeArrayOther) \
 253   f(Method) \
 254   f(ConstMethod) \
 255   f(MethodData) \
 256   f(ConstantPool) \
 257   f(ConstantPoolCache) \
 258   f(Annotation) \
 259   f(MethodCounters) \
 260   f(Deallocated)
 261 
 262 #define METASPACE_OBJ_TYPE_DECLARE(name) name ## Type,
 263 #define METASPACE_OBJ_TYPE_NAME_CASE(name) case name ## Type: return #name;
 264 
 265   enum Type {
 266     // Types are MetaspaceObj::ClassType, MetaspaceObj::SymbolType, etc
 267     METASPACE_OBJ_TYPES_DO(METASPACE_OBJ_TYPE_DECLARE)
 268     _number_of_types
 269   };
 270 
 271   static const char * type_name(Type type) {
 272     switch(type) {
 273     METASPACE_OBJ_TYPES_DO(METASPACE_OBJ_TYPE_NAME_CASE)
 274     default:
 275       ShouldNotReachHere();
 276       return NULL;
 277     }
 278   }
 279 
 280   static MetaspaceObj::Type array_type(size_t elem_size) {
 281     switch (elem_size) {
 282     case 1: return TypeArrayU1Type;
 283     case 2: return TypeArrayU2Type;
 284     case 4: return TypeArrayU4Type;
 285     case 8: return TypeArrayU8Type;
 286     default:
 287       return TypeArrayOtherType;
 288     }
 289   }
 290 
 291   void* operator new(size_t size, ClassLoaderData* loader_data,
 292                      size_t word_size, bool read_only,
 293                      Type type, Thread* thread) throw();
 294                      // can't use TRAPS from this header file.
 295   void operator delete(void* p) { ShouldNotCallThis(); }
 296 };
 297 
 298 // Base class for classes that constitute name spaces.
 299 
 300 class AllStatic {
 301  public:
 302   AllStatic()  { ShouldNotCallThis(); }
 303   ~AllStatic() { ShouldNotCallThis(); }
 304 };
 305 
 306 
 307 //------------------------------Chunk------------------------------------------
 308 // Linked list of raw memory chunks
 309 class Chunk: CHeapObj<mtChunk> {
 310   friend class VMStructs;
 311 
 312  protected:
 313   Chunk*       _next;     // Next Chunk in list
 314   const size_t _len;      // Size of this Chunk
 315  public:
 316   void* operator new(size_t size, AllocFailType alloc_failmode, size_t length) throw();
 317   void  operator delete(void* p);
 318   Chunk(size_t length);
 319 
 320   enum {
 321     // default sizes; make them slightly smaller than 2**k to guard against
 322     // buddy-system style malloc implementations
 323 #ifdef _LP64
 324     slack      = 40,            // [RGV] Not sure if this is right, but make it
 325                                 //       a multiple of 8.
 326 #else
 327     slack      = 20,            // suspected sizeof(Chunk) + internal malloc headers
 328 #endif
 329 
 330     tiny_size  =  256  - slack, // Size of first chunk (tiny)
 331     init_size  =  1*K  - slack, // Size of first chunk (normal aka small)
 332     medium_size= 10*K  - slack, // Size of medium-sized chunk
 333     size       = 32*K  - slack, // Default size of an Arena chunk (following the first)
 334     non_pool_size = init_size + 32 // An initial size which is not one of above
 335   };
 336 
 337   void chop();                  // Chop this chunk
 338   void next_chop();             // Chop next chunk
 339   static size_t aligned_overhead_size(void) { return ARENA_ALIGN(sizeof(Chunk)); }
 340   static size_t aligned_overhead_size(size_t byte_size) { return ARENA_ALIGN(byte_size); }
 341 
 342   size_t length() const         { return _len;  }
 343   Chunk* next() const           { return _next;  }
 344   void set_next(Chunk* n)       { _next = n;  }
 345   // Boundaries of data area (possibly unused)
 346   char* bottom() const          { return ((char*) this) + aligned_overhead_size();  }
 347   char* top()    const          { return bottom() + _len; }
 348   bool contains(char* p) const  { return bottom() <= p && p <= top(); }
 349 
 350   // Start the chunk_pool cleaner task
 351   static void start_chunk_pool_cleaner_task();
 352 
 353   static void clean_chunk_pool();
 354 };
 355 
 356 //------------------------------Arena------------------------------------------
 357 // Fast allocation of memory
 358 class Arena : public CHeapObj<mtNone> {
 359 protected:
 360   friend class ResourceMark;
 361   friend class HandleMark;
 362   friend class NoHandleMark;
 363   friend class VMStructs;
 364 
 365   MEMFLAGS    _flags;           // Memory tracking flags
 366 
 367   Chunk *_first;                // First chunk
 368   Chunk *_chunk;                // current chunk
 369   char *_hwm, *_max;            // High water mark and max in current chunk
 370   // Get a new Chunk of at least size x
 371   void* grow(size_t x, AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM);
 372   size_t _size_in_bytes;        // Size of arena (used for native memory tracking)
 373 
 374   NOT_PRODUCT(static julong _bytes_allocated;) // total #bytes allocated since start
 375   friend class AllocStats;
 376   debug_only(void* malloc(size_t size);)
 377   debug_only(void* internal_malloc_4(size_t x);)
 378   NOT_PRODUCT(void inc_bytes_allocated(size_t x);)
 379 
 380   void signal_out_of_memory(size_t request, const char* whence) const;
 381 
 382   bool check_for_overflow(size_t request, const char* whence,
 383       AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM) const {
 384     if (UINTPTR_MAX - request < (uintptr_t)_hwm) {
 385       if (alloc_failmode == AllocFailStrategy::RETURN_NULL) {
 386         return false;
 387       }
 388       signal_out_of_memory(request, whence);
 389     }
 390     return true;
 391  }
 392 
 393  public:
 394   Arena(MEMFLAGS memflag);
 395   Arena(MEMFLAGS memflag, size_t init_size);
 396   ~Arena();
 397   void  destruct_contents();
 398   char* hwm() const             { return _hwm; }
 399 
 400   // new operators
 401   void* operator new (size_t size) throw();
 402   void* operator new (size_t size, const std::nothrow_t& nothrow_constant) throw();
 403 
 404   // dynamic memory type tagging
 405   void* operator new(size_t size, MEMFLAGS flags) throw();
 406   void* operator new(size_t size, const std::nothrow_t& nothrow_constant, MEMFLAGS flags) throw();
 407   void  operator delete(void* p);
 408 
 409   // Fast allocate in the arena.  Common case is: pointer test + increment.
 410   void* Amalloc(size_t x, AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM) {
 411     assert(is_power_of_2(ARENA_AMALLOC_ALIGNMENT) , "should be a power of 2");
 412     x = ARENA_ALIGN(x);
 413     debug_only(if (UseMallocOnly) return malloc(x);)
 414     if (!check_for_overflow(x, "Arena::Amalloc", alloc_failmode))
 415       return NULL;
 416     NOT_PRODUCT(inc_bytes_allocated(x);)
 417     if (_hwm + x > _max) {
 418       return grow(x, alloc_failmode);
 419     } else {
 420       char *old = _hwm;
 421       _hwm += x;
 422       return old;
 423     }
 424   }
 425   // Further assume size is padded out to words
 426   void *Amalloc_4(size_t x, AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM) {
 427     assert( (x&(sizeof(char*)-1)) == 0, "misaligned size" );
 428     debug_only(if (UseMallocOnly) return malloc(x);)
 429     if (!check_for_overflow(x, "Arena::Amalloc_4", alloc_failmode))
 430       return NULL;
 431     NOT_PRODUCT(inc_bytes_allocated(x);)
 432     if (_hwm + x > _max) {
 433       return grow(x, alloc_failmode);
 434     } else {
 435       char *old = _hwm;
 436       _hwm += x;
 437       return old;
 438     }
 439   }
 440 
 441   // Allocate with 'double' alignment. It is 8 bytes on sparc.
 442   // In other cases Amalloc_D() should be the same as Amalloc_4().
 443   void* Amalloc_D(size_t x, AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM) {
 444     assert( (x&(sizeof(char*)-1)) == 0, "misaligned size" );
 445     debug_only(if (UseMallocOnly) return malloc(x);)
 446 #if defined(SPARC) && !defined(_LP64)
 447 #define DALIGN_M1 7
 448     size_t delta = (((size_t)_hwm + DALIGN_M1) & ~DALIGN_M1) - (size_t)_hwm;
 449     x += delta;
 450 #endif
 451     if (!check_for_overflow(x, "Arena::Amalloc_D", alloc_failmode))
 452       return NULL;
 453     NOT_PRODUCT(inc_bytes_allocated(x);)
 454     if (_hwm + x > _max) {
 455       return grow(x, alloc_failmode); // grow() returns a result aligned >= 8 bytes.
 456     } else {
 457       char *old = _hwm;
 458       _hwm += x;
 459 #if defined(SPARC) && !defined(_LP64)
 460       old += delta; // align to 8-bytes
 461 #endif
 462       return old;
 463     }
 464   }
 465 
 466   // Fast delete in area.  Common case is: NOP (except for storage reclaimed)
 467   void Afree(void *ptr, size_t size) {
 468 #ifdef ASSERT
 469     if (ZapResourceArea) memset(ptr, badResourceValue, size); // zap freed memory
 470     if (UseMallocOnly) return;
 471 #endif
 472     if (((char*)ptr) + size == _hwm) _hwm = (char*)ptr;
 473   }
 474 
 475   void *Arealloc( void *old_ptr, size_t old_size, size_t new_size,
 476       AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM);
 477 
 478   // Move contents of this arena into an empty arena
 479   Arena *move_contents(Arena *empty_arena);
 480 
 481   // Determine if pointer belongs to this Arena or not.
 482   bool contains( const void *ptr ) const;
 483 
 484   // Total of all chunks in use (not thread-safe)
 485   size_t used() const;
 486 
 487   // Total # of bytes used
 488   size_t size_in_bytes() const         {  return _size_in_bytes; };
 489   void set_size_in_bytes(size_t size);
 490 
 491   static void free_malloced_objects(Chunk* chunk, char* hwm, char* max, char* hwm2)  PRODUCT_RETURN;
 492   static void free_all(char** start, char** end)                                     PRODUCT_RETURN;
 493 
 494 private:
 495   // Reset this Arena to empty, access will trigger grow if necessary
 496   void   reset(void) {
 497     _first = _chunk = NULL;
 498     _hwm = _max = NULL;
 499     set_size_in_bytes(0);
 500   }
 501 };
 502 
 503 // One of the following macros must be used when allocating
 504 // an array or object from an arena
 505 #define NEW_ARENA_ARRAY(arena, type, size) \
 506   (type*) (arena)->Amalloc((size) * sizeof(type))
 507 
 508 #define REALLOC_ARENA_ARRAY(arena, type, old, old_size, new_size)    \
 509   (type*) (arena)->Arealloc((char*)(old), (old_size) * sizeof(type), \
 510                             (new_size) * sizeof(type) )
 511 
 512 #define FREE_ARENA_ARRAY(arena, type, old, size) \
 513   (arena)->Afree((char*)(old), (size) * sizeof(type))
 514 
 515 #define NEW_ARENA_OBJ(arena, type) \
 516   NEW_ARENA_ARRAY(arena, type, 1)
 517 
 518 
 519 //%note allocation_1
 520 extern char* resource_allocate_bytes(size_t size,
 521     AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM);
 522 extern char* resource_allocate_bytes(Thread* thread, size_t size,
 523     AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM);
 524 extern char* resource_reallocate_bytes( char *old, size_t old_size, size_t new_size,
 525     AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM);
 526 extern void resource_free_bytes( char *old, size_t size );
 527 
 528 //----------------------------------------------------------------------
 529 // Base class for objects allocated in the resource area per default.
 530 // Optionally, objects may be allocated on the C heap with
 531 // new(ResourceObj::C_HEAP) Foo(...) or in an Arena with new (&arena)
 532 // ResourceObj's can be allocated within other objects, but don't use
 533 // new or delete (allocation_type is unknown).  If new is used to allocate,
 534 // use delete to deallocate.
 535 class ResourceObj ALLOCATION_SUPER_CLASS_SPEC {
 536  public:
 537   enum allocation_type { STACK_OR_EMBEDDED = 0, RESOURCE_AREA, C_HEAP, ARENA, allocation_mask = 0x3 };
 538   static void set_allocation_type(address res, allocation_type type) NOT_DEBUG_RETURN;
 539 #ifdef ASSERT
 540  private:
 541   // When this object is allocated on stack the new() operator is not
 542   // called but garbage on stack may look like a valid allocation_type.
 543   // Store negated 'this' pointer when new() is called to distinguish cases.
 544   // Use second array's element for verification value to distinguish garbage.
 545   uintptr_t _allocation_t[2];
 546   bool is_type_set() const;
 547  public:
 548   allocation_type get_allocation_type() const;
 549   bool allocated_on_stack()    const { return get_allocation_type() == STACK_OR_EMBEDDED; }
 550   bool allocated_on_res_area() const { return get_allocation_type() == RESOURCE_AREA; }
 551   bool allocated_on_C_heap()   const { return get_allocation_type() == C_HEAP; }
 552   bool allocated_on_arena()    const { return get_allocation_type() == ARENA; }
 553   ResourceObj(); // default constructor
 554   ResourceObj(const ResourceObj& r); // default copy constructor
 555   ResourceObj& operator=(const ResourceObj& r); // default copy assignment
 556   ~ResourceObj();
 557 #endif // ASSERT
 558 
 559  public:
 560   void* operator new(size_t size, allocation_type type, MEMFLAGS flags) throw();
 561   void* operator new [](size_t size, allocation_type type, MEMFLAGS flags) throw();
 562   void* operator new(size_t size, const std::nothrow_t&  nothrow_constant,
 563       allocation_type type, MEMFLAGS flags) throw();
 564   void* operator new [](size_t size, const std::nothrow_t&  nothrow_constant,
 565       allocation_type type, MEMFLAGS flags) throw();
 566 
 567   void* operator new(size_t size, Arena *arena) throw() {
 568       address res = (address)arena->Amalloc(size);
 569       DEBUG_ONLY(set_allocation_type(res, ARENA);)
 570       return res;
 571   }
 572 
 573   void* operator new [](size_t size, Arena *arena) throw() {
 574       address res = (address)arena->Amalloc(size);
 575       DEBUG_ONLY(set_allocation_type(res, ARENA);)
 576       return res;
 577   }
 578 
 579   void* operator new(size_t size) throw() {
 580       address res = (address)resource_allocate_bytes(size);
 581       DEBUG_ONLY(set_allocation_type(res, RESOURCE_AREA);)
 582       return res;
 583   }
 584 
 585   void* operator new(size_t size, const std::nothrow_t& nothrow_constant) throw() {
 586       address res = (address)resource_allocate_bytes(size, AllocFailStrategy::RETURN_NULL);
 587       DEBUG_ONLY(if (res != NULL) set_allocation_type(res, RESOURCE_AREA);)
 588       return res;
 589   }
 590 
 591   void* operator new [](size_t size) throw() {
 592       address res = (address)resource_allocate_bytes(size);
 593       DEBUG_ONLY(set_allocation_type(res, RESOURCE_AREA);)
 594       return res;
 595   }
 596 
 597   void* operator new [](size_t size, const std::nothrow_t& nothrow_constant) throw() {
 598       address res = (address)resource_allocate_bytes(size, AllocFailStrategy::RETURN_NULL);
 599       DEBUG_ONLY(if (res != NULL) set_allocation_type(res, RESOURCE_AREA);)
 600       return res;
 601   }
 602 
 603   void  operator delete(void* p);
 604   void  operator delete [](void* p);
 605 };
 606 
 607 // One of the following macros must be used when allocating an array
 608 // or object to determine whether it should reside in the C heap on in
 609 // the resource area.
 610 
 611 #define NEW_RESOURCE_ARRAY(type, size)\
 612   (type*) resource_allocate_bytes((size) * sizeof(type))
 613 
 614 #define NEW_RESOURCE_ARRAY_RETURN_NULL(type, size)\
 615   (type*) resource_allocate_bytes((size) * sizeof(type), AllocFailStrategy::RETURN_NULL)
 616 
 617 #define NEW_RESOURCE_ARRAY_IN_THREAD(thread, type, size)\
 618   (type*) resource_allocate_bytes(thread, (size) * sizeof(type))
 619 
 620 #define NEW_RESOURCE_ARRAY_IN_THREAD_RETURN_NULL(thread, type, size)\
 621   (type*) resource_allocate_bytes(thread, (size) * sizeof(type), AllocFailStrategy::RETURN_NULL)
 622 
 623 #define REALLOC_RESOURCE_ARRAY(type, old, old_size, new_size)\
 624   (type*) resource_reallocate_bytes((char*)(old), (old_size) * sizeof(type), (new_size) * sizeof(type))
 625 
 626 #define REALLOC_RESOURCE_ARRAY_RETURN_NULL(type, old, old_size, new_size)\
 627   (type*) resource_reallocate_bytes((char*)(old), (old_size) * sizeof(type),\
 628                                     (new_size) * sizeof(type), AllocFailStrategy::RETURN_NULL)
 629 
 630 #define FREE_RESOURCE_ARRAY(type, old, size)\
 631   resource_free_bytes((char*)(old), (size) * sizeof(type))
 632 
 633 #define FREE_FAST(old)\
 634     /* nop */
 635 
 636 #define NEW_RESOURCE_OBJ(type)\
 637   NEW_RESOURCE_ARRAY(type, 1)
 638 
 639 #define NEW_RESOURCE_OBJ_RETURN_NULL(type)\
 640   NEW_RESOURCE_ARRAY_RETURN_NULL(type, 1)
 641 
 642 #define NEW_C_HEAP_ARRAY3(type, size, memflags, pc, allocfail)\
 643   (type*) AllocateHeap((size) * sizeof(type), memflags, pc, allocfail)
 644 
 645 #define NEW_C_HEAP_ARRAY2(type, size, memflags, pc)\
 646   (type*) (AllocateHeap((size) * sizeof(type), memflags, pc))
 647 
 648 #define NEW_C_HEAP_ARRAY(type, size, memflags)\
 649   (type*) (AllocateHeap((size) * sizeof(type), memflags))
 650 
 651 #define NEW_C_HEAP_ARRAY2_RETURN_NULL(type, size, memflags, pc)\
 652   NEW_C_HEAP_ARRAY3(type, (size), memflags, pc, AllocFailStrategy::RETURN_NULL)
 653 
 654 #define NEW_C_HEAP_ARRAY_RETURN_NULL(type, size, memflags)\
 655   NEW_C_HEAP_ARRAY3(type, (size), memflags, CURRENT_PC, AllocFailStrategy::RETURN_NULL)
 656 
 657 #define REALLOC_C_HEAP_ARRAY(type, old, size, memflags)\
 658   (type*) (ReallocateHeap((char*)(old), (size) * sizeof(type), memflags))
 659 
 660 #define REALLOC_C_HEAP_ARRAY_RETURN_NULL(type, old, size, memflags)\
 661   (type*) (ReallocateHeap((char*)(old), (size) * sizeof(type), memflags, AllocFailStrategy::RETURN_NULL))
 662 
 663 #define FREE_C_HEAP_ARRAY(type, old) \
 664   FreeHeap((char*)(old))
 665 
 666 // allocate type in heap without calling ctor
 667 #define NEW_C_HEAP_OBJ(type, memflags)\
 668   NEW_C_HEAP_ARRAY(type, 1, memflags)
 669 
 670 #define NEW_C_HEAP_OBJ_RETURN_NULL(type, memflags)\
 671   NEW_C_HEAP_ARRAY_RETURN_NULL(type, 1, memflags)
 672 
 673 // deallocate obj of type in heap without calling dtor
 674 #define FREE_C_HEAP_OBJ(objname)\
 675   FreeHeap((char*)objname);
 676 
 677 // for statistics
 678 #ifndef PRODUCT
 679 class AllocStats : StackObj {
 680   julong start_mallocs, start_frees;
 681   julong start_malloc_bytes, start_mfree_bytes, start_res_bytes;
 682  public:
 683   AllocStats();
 684 
 685   julong num_mallocs();    // since creation of receiver
 686   julong alloc_bytes();
 687   julong num_frees();
 688   julong free_bytes();
 689   julong resource_bytes();
 690   void   print();
 691 };
 692 #endif
 693 
 694 
 695 //------------------------------ReallocMark---------------------------------
 696 // Code which uses REALLOC_RESOURCE_ARRAY should check an associated
 697 // ReallocMark, which is declared in the same scope as the reallocated
 698 // pointer.  Any operation that could __potentially__ cause a reallocation
 699 // should check the ReallocMark.
 700 class ReallocMark: public StackObj {
 701 protected:
 702   NOT_PRODUCT(int _nesting;)
 703 
 704 public:
 705   ReallocMark()   PRODUCT_RETURN;
 706   void check()    PRODUCT_RETURN;
 707 };
 708 
 709 // Helper class to allocate arrays that may become large.
 710 // Uses the OS malloc for allocations smaller than ArrayAllocatorMallocLimit
 711 // and uses mapped memory for larger allocations.
 712 // Most OS mallocs do something similar but Solaris malloc does not revert
 713 // to mapped memory for large allocations. By default ArrayAllocatorMallocLimit
 714 // is set so that we always use malloc except for Solaris where we set the
 715 // limit to get mapped memory.
 716 template <class E, MEMFLAGS F>
 717 class ArrayAllocator : public AllStatic {
 718  private:
 719   static bool should_use_malloc(size_t length);
 720 
 721   static E* allocate_malloc(size_t length);
 722   static E* allocate_mmap(size_t length);
 723 
 724   static void free_malloc(E* addr, size_t length);
 725   static void free_mmap(E* addr, size_t length);
 726 
 727  public:
 728   static E* allocate(size_t length);
 729   static E* reallocate(E* old_addr, size_t old_length, size_t new_length);
 730   static void free(E* addr, size_t length);
 731 };
 732 
 733 // Uses mmaped memory for all allocations. All allocations are initially
 734 // zero-filled. No pre-touching.
 735 template <class E, MEMFLAGS F>
 736 class MmapArrayAllocator : public AllStatic {
 737  private:
 738   static size_t size_for(size_t length);
 739 
 740  public:
 741   static E* allocate_or_null(size_t length);
 742   static E* allocate(size_t length);
 743   static void free(E* addr, size_t length);
 744 };
 745 
 746 // Uses malloc:ed memory for all allocations.
 747 template <class E, MEMFLAGS F>
 748 class MallocArrayAllocator : public AllStatic {
 749  public:
 750   static size_t size_for(size_t length);
 751 
 752   static E* allocate(size_t length);
 753   static void free(E* addr, size_t length);
 754 };
 755 
 756 #endif // SHARE_VM_MEMORY_ALLOCATION_HPP