Thu, 23 May 2013 12:44:18 +0100
Merge
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 */
25 #ifndef SHARE_VM_MEMORY_ALLOCATION_HPP
26 #define SHARE_VM_MEMORY_ALLOCATION_HPP
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
38 #include <new>
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)
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
56 class AllocFailStrategy {
57 public:
58 enum AllocFailEnum { EXIT_OOM, RETURN_NULL };
59 };
60 typedef AllocFailStrategy::AllocFailEnum AllocFailType;
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.
112 // Base class for objects allocated in the C-heap.
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.
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;
129 virtual void print_on(outputStream* st) const;
130 virtual void print_value_on(outputStream* st) const;
131 };
132 #endif
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 mt_number_of_types = 0x000E, // number of memory types (mtDontTrack
161 // is not included as validate type)
162 mtDontTrack = 0x0F00, // memory we do not or cannot track
163 mt_masks = 0x7F00,
165 // object type mask
166 otArena = 0x0010, // an arena object
167 otNMTRecorder = 0x0020, // memory recorder object
168 ot_masks = 0x00F0
169 };
171 #define IS_MEMORY_TYPE(flags, type) ((flags & mt_masks) == type)
172 #define HAS_VALID_MEMORY_TYPE(flags)((flags & mt_masks) != mtNone)
173 #define FLAGS_TO_MEMORY_TYPE(flags) (flags & mt_masks)
175 #define IS_ARENA_OBJ(flags) ((flags & ot_masks) == otArena)
176 #define IS_NMT_RECORDER(flags) ((flags & ot_masks) == otNMTRecorder)
177 #define NMT_CAN_TRACK(flags) (!IS_NMT_RECORDER(flags) && !(IS_MEMORY_TYPE(flags, mtDontTrack)))
179 typedef unsigned short MEMFLAGS;
181 #if INCLUDE_NMT
183 extern bool NMT_track_callsite;
185 #else
187 const bool NMT_track_callsite = false;
189 #endif // INCLUDE_NMT
191 // debug build does not inline
192 #if defined(_NMT_NOINLINE_)
193 #define CURRENT_PC (NMT_track_callsite ? os::get_caller_pc(1) : 0)
194 #define CALLER_PC (NMT_track_callsite ? os::get_caller_pc(2) : 0)
195 #define CALLER_CALLER_PC (NMT_track_callsite ? os::get_caller_pc(3) : 0)
196 #else
197 #define CURRENT_PC (NMT_track_callsite? os::get_caller_pc(0) : 0)
198 #define CALLER_PC (NMT_track_callsite ? os::get_caller_pc(1) : 0)
199 #define CALLER_CALLER_PC (NMT_track_callsite ? os::get_caller_pc(2) : 0)
200 #endif
204 template <MEMFLAGS F> class CHeapObj ALLOCATION_SUPER_CLASS_SPEC {
205 public:
206 _NOINLINE_ void* operator new(size_t size, address caller_pc = 0);
207 _NOINLINE_ void* operator new (size_t size, const std::nothrow_t& nothrow_constant,
208 address caller_pc = 0);
209 _NOINLINE_ void* operator new [](size_t size, address caller_pc = 0);
210 _NOINLINE_ void* operator new [](size_t size, const std::nothrow_t& nothrow_constant,
211 address caller_pc = 0);
212 void operator delete(void* p);
213 void operator delete [] (void* p);
214 };
216 // Base class for objects allocated on the stack only.
217 // Calling new or delete will result in fatal error.
219 class StackObj ALLOCATION_SUPER_CLASS_SPEC {
220 private:
221 void* operator new(size_t size);
222 void operator delete(void* p);
223 void* operator new [](size_t size);
224 void operator delete [](void* p);
225 };
227 // Base class for objects used as value objects.
228 // Calling new or delete will result in fatal error.
229 //
230 // Portability note: Certain compilers (e.g. gcc) will
231 // always make classes bigger if it has a superclass, even
232 // if the superclass does not have any virtual methods or
233 // instance fields. The HotSpot implementation relies on this
234 // not to happen. So never make a ValueObj class a direct subclass
235 // of this object, but use the VALUE_OBJ_CLASS_SPEC class instead, e.g.,
236 // like this:
237 //
238 // class A VALUE_OBJ_CLASS_SPEC {
239 // ...
240 // }
241 //
242 // With gcc and possible other compilers the VALUE_OBJ_CLASS_SPEC can
243 // be defined as a an empty string "".
244 //
245 class _ValueObj {
246 private:
247 void* operator new(size_t size);
248 void operator delete(void* p);
249 void* operator new [](size_t size);
250 void operator delete [](void* p);
251 };
254 // Base class for objects stored in Metaspace.
255 // Calling delete will result in fatal error.
256 //
257 // Do not inherit from something with a vptr because this class does
258 // not introduce one. This class is used to allocate both shared read-only
259 // and shared read-write classes.
260 //
262 class ClassLoaderData;
264 class MetaspaceObj {
265 public:
266 bool is_metadata() const;
267 bool is_metaspace_object() const; // more specific test but slower
268 bool is_shared() const;
269 void print_address_on(outputStream* st) const; // nonvirtual address printing
271 void* operator new(size_t size, ClassLoaderData* loader_data,
272 size_t word_size, bool read_only, Thread* thread);
273 // can't use TRAPS from this header file.
274 void operator delete(void* p) { ShouldNotCallThis(); }
275 };
277 // Base class for classes that constitute name spaces.
279 class AllStatic {
280 public:
281 AllStatic() { ShouldNotCallThis(); }
282 ~AllStatic() { ShouldNotCallThis(); }
283 };
286 //------------------------------Chunk------------------------------------------
287 // Linked list of raw memory chunks
288 class Chunk: CHeapObj<mtChunk> {
289 friend class VMStructs;
291 protected:
292 Chunk* _next; // Next Chunk in list
293 const size_t _len; // Size of this Chunk
294 public:
295 void* operator new(size_t size, AllocFailType alloc_failmode, size_t length);
296 void operator delete(void* p);
297 Chunk(size_t length);
299 enum {
300 // default sizes; make them slightly smaller than 2**k to guard against
301 // buddy-system style malloc implementations
302 #ifdef _LP64
303 slack = 40, // [RGV] Not sure if this is right, but make it
304 // a multiple of 8.
305 #else
306 slack = 20, // suspected sizeof(Chunk) + internal malloc headers
307 #endif
309 init_size = 1*K - slack, // Size of first chunk
310 medium_size= 10*K - slack, // Size of medium-sized chunk
311 size = 32*K - slack, // Default size of an Arena chunk (following the first)
312 non_pool_size = init_size + 32 // An initial size which is not one of above
313 };
315 void chop(); // Chop this chunk
316 void next_chop(); // Chop next chunk
317 static size_t aligned_overhead_size(void) { return ARENA_ALIGN(sizeof(Chunk)); }
318 static size_t aligned_overhead_size(size_t byte_size) { return ARENA_ALIGN(byte_size); }
320 size_t length() const { return _len; }
321 Chunk* next() const { return _next; }
322 void set_next(Chunk* n) { _next = n; }
323 // Boundaries of data area (possibly unused)
324 char* bottom() const { return ((char*) this) + aligned_overhead_size(); }
325 char* top() const { return bottom() + _len; }
326 bool contains(char* p) const { return bottom() <= p && p <= top(); }
328 // Start the chunk_pool cleaner task
329 static void start_chunk_pool_cleaner_task();
331 static void clean_chunk_pool();
332 };
334 //------------------------------Arena------------------------------------------
335 // Fast allocation of memory
336 class Arena : public CHeapObj<mtNone|otArena> {
337 protected:
338 friend class ResourceMark;
339 friend class HandleMark;
340 friend class NoHandleMark;
341 friend class VMStructs;
343 Chunk *_first; // First chunk
344 Chunk *_chunk; // current chunk
345 char *_hwm, *_max; // High water mark and max in current chunk
346 // Get a new Chunk of at least size x
347 void* grow(size_t x, AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM);
348 size_t _size_in_bytes; // Size of arena (used for native memory tracking)
350 NOT_PRODUCT(static julong _bytes_allocated;) // total #bytes allocated since start
351 friend class AllocStats;
352 debug_only(void* malloc(size_t size);)
353 debug_only(void* internal_malloc_4(size_t x);)
354 NOT_PRODUCT(void inc_bytes_allocated(size_t x);)
356 void signal_out_of_memory(size_t request, const char* whence) const;
358 bool check_for_overflow(size_t request, const char* whence,
359 AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM) const {
360 if (UINTPTR_MAX - request < (uintptr_t)_hwm) {
361 if (alloc_failmode == AllocFailStrategy::RETURN_NULL) {
362 return false;
363 }
364 signal_out_of_memory(request, whence);
365 }
366 return true;
367 }
369 public:
370 Arena();
371 Arena(size_t init_size);
372 ~Arena();
373 void destruct_contents();
374 char* hwm() const { return _hwm; }
376 // new operators
377 void* operator new (size_t size);
378 void* operator new (size_t size, const std::nothrow_t& nothrow_constant);
380 // dynamic memory type tagging
381 void* operator new(size_t size, MEMFLAGS flags);
382 void* operator new(size_t size, const std::nothrow_t& nothrow_constant, MEMFLAGS flags);
383 void operator delete(void* p);
385 // Fast allocate in the arena. Common case is: pointer test + increment.
386 void* Amalloc(size_t x, AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM) {
387 assert(is_power_of_2(ARENA_AMALLOC_ALIGNMENT) , "should be a power of 2");
388 x = ARENA_ALIGN(x);
389 debug_only(if (UseMallocOnly) return malloc(x);)
390 if (!check_for_overflow(x, "Arena::Amalloc", alloc_failmode))
391 return NULL;
392 NOT_PRODUCT(inc_bytes_allocated(x);)
393 if (_hwm + x > _max) {
394 return grow(x, alloc_failmode);
395 } else {
396 char *old = _hwm;
397 _hwm += x;
398 return old;
399 }
400 }
401 // Further assume size is padded out to words
402 void *Amalloc_4(size_t x, AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM) {
403 assert( (x&(sizeof(char*)-1)) == 0, "misaligned size" );
404 debug_only(if (UseMallocOnly) return malloc(x);)
405 if (!check_for_overflow(x, "Arena::Amalloc_4", alloc_failmode))
406 return NULL;
407 NOT_PRODUCT(inc_bytes_allocated(x);)
408 if (_hwm + x > _max) {
409 return grow(x, alloc_failmode);
410 } else {
411 char *old = _hwm;
412 _hwm += x;
413 return old;
414 }
415 }
417 // Allocate with 'double' alignment. It is 8 bytes on sparc.
418 // In other cases Amalloc_D() should be the same as Amalloc_4().
419 void* Amalloc_D(size_t x, AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM) {
420 assert( (x&(sizeof(char*)-1)) == 0, "misaligned size" );
421 debug_only(if (UseMallocOnly) return malloc(x);)
422 #if defined(SPARC) && !defined(_LP64)
423 #define DALIGN_M1 7
424 size_t delta = (((size_t)_hwm + DALIGN_M1) & ~DALIGN_M1) - (size_t)_hwm;
425 x += delta;
426 #endif
427 if (!check_for_overflow(x, "Arena::Amalloc_D", alloc_failmode))
428 return NULL;
429 NOT_PRODUCT(inc_bytes_allocated(x);)
430 if (_hwm + x > _max) {
431 return grow(x, alloc_failmode); // grow() returns a result aligned >= 8 bytes.
432 } else {
433 char *old = _hwm;
434 _hwm += x;
435 #if defined(SPARC) && !defined(_LP64)
436 old += delta; // align to 8-bytes
437 #endif
438 return old;
439 }
440 }
442 // Fast delete in area. Common case is: NOP (except for storage reclaimed)
443 void Afree(void *ptr, size_t size) {
444 #ifdef ASSERT
445 if (ZapResourceArea) memset(ptr, badResourceValue, size); // zap freed memory
446 if (UseMallocOnly) return;
447 #endif
448 if (((char*)ptr) + size == _hwm) _hwm = (char*)ptr;
449 }
451 void *Arealloc( void *old_ptr, size_t old_size, size_t new_size,
452 AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM);
454 // Move contents of this arena into an empty arena
455 Arena *move_contents(Arena *empty_arena);
457 // Determine if pointer belongs to this Arena or not.
458 bool contains( const void *ptr ) const;
460 // Total of all chunks in use (not thread-safe)
461 size_t used() const;
463 // Total # of bytes used
464 size_t size_in_bytes() const { return _size_in_bytes; };
465 void set_size_in_bytes(size_t size);
467 static void free_malloced_objects(Chunk* chunk, char* hwm, char* max, char* hwm2) PRODUCT_RETURN;
468 static void free_all(char** start, char** end) PRODUCT_RETURN;
470 // how many arena instances
471 NOT_PRODUCT(static volatile jint _instance_count;)
472 private:
473 // Reset this Arena to empty, access will trigger grow if necessary
474 void reset(void) {
475 _first = _chunk = NULL;
476 _hwm = _max = NULL;
477 set_size_in_bytes(0);
478 }
479 };
481 // One of the following macros must be used when allocating
482 // an array or object from an arena
483 #define NEW_ARENA_ARRAY(arena, type, size) \
484 (type*) (arena)->Amalloc((size) * sizeof(type))
486 #define REALLOC_ARENA_ARRAY(arena, type, old, old_size, new_size) \
487 (type*) (arena)->Arealloc((char*)(old), (old_size) * sizeof(type), \
488 (new_size) * sizeof(type) )
490 #define FREE_ARENA_ARRAY(arena, type, old, size) \
491 (arena)->Afree((char*)(old), (size) * sizeof(type))
493 #define NEW_ARENA_OBJ(arena, type) \
494 NEW_ARENA_ARRAY(arena, type, 1)
497 //%note allocation_1
498 extern char* resource_allocate_bytes(size_t size,
499 AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM);
500 extern char* resource_allocate_bytes(Thread* thread, size_t size,
501 AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM);
502 extern char* resource_reallocate_bytes( char *old, size_t old_size, size_t new_size,
503 AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM);
504 extern void resource_free_bytes( char *old, size_t size );
506 //----------------------------------------------------------------------
507 // Base class for objects allocated in the resource area per default.
508 // Optionally, objects may be allocated on the C heap with
509 // new(ResourceObj::C_HEAP) Foo(...) or in an Arena with new (&arena)
510 // ResourceObj's can be allocated within other objects, but don't use
511 // new or delete (allocation_type is unknown). If new is used to allocate,
512 // use delete to deallocate.
513 class ResourceObj ALLOCATION_SUPER_CLASS_SPEC {
514 public:
515 enum allocation_type { STACK_OR_EMBEDDED = 0, RESOURCE_AREA, C_HEAP, ARENA, allocation_mask = 0x3 };
516 static void set_allocation_type(address res, allocation_type type) NOT_DEBUG_RETURN;
517 #ifdef ASSERT
518 private:
519 // When this object is allocated on stack the new() operator is not
520 // called but garbage on stack may look like a valid allocation_type.
521 // Store negated 'this' pointer when new() is called to distinguish cases.
522 // Use second array's element for verification value to distinguish garbage.
523 uintptr_t _allocation_t[2];
524 bool is_type_set() const;
525 public:
526 allocation_type get_allocation_type() const;
527 bool allocated_on_stack() const { return get_allocation_type() == STACK_OR_EMBEDDED; }
528 bool allocated_on_res_area() const { return get_allocation_type() == RESOURCE_AREA; }
529 bool allocated_on_C_heap() const { return get_allocation_type() == C_HEAP; }
530 bool allocated_on_arena() const { return get_allocation_type() == ARENA; }
531 ResourceObj(); // default construtor
532 ResourceObj(const ResourceObj& r); // default copy construtor
533 ResourceObj& operator=(const ResourceObj& r); // default copy assignment
534 ~ResourceObj();
535 #endif // ASSERT
537 public:
538 void* operator new(size_t size, allocation_type type, MEMFLAGS flags);
539 void* operator new [](size_t size, allocation_type type, MEMFLAGS flags);
540 void* operator new(size_t size, const std::nothrow_t& nothrow_constant,
541 allocation_type type, MEMFLAGS flags);
542 void* operator new [](size_t size, const std::nothrow_t& nothrow_constant,
543 allocation_type type, MEMFLAGS flags);
545 void* operator new(size_t size, Arena *arena) {
546 address res = (address)arena->Amalloc(size);
547 DEBUG_ONLY(set_allocation_type(res, ARENA);)
548 return res;
549 }
551 void* operator new [](size_t size, Arena *arena) {
552 address res = (address)arena->Amalloc(size);
553 DEBUG_ONLY(set_allocation_type(res, ARENA);)
554 return res;
555 }
557 void* operator new(size_t size) {
558 address res = (address)resource_allocate_bytes(size);
559 DEBUG_ONLY(set_allocation_type(res, RESOURCE_AREA);)
560 return res;
561 }
563 void* operator new(size_t size, const std::nothrow_t& nothrow_constant) {
564 address res = (address)resource_allocate_bytes(size, AllocFailStrategy::RETURN_NULL);
565 DEBUG_ONLY(if (res != NULL) set_allocation_type(res, RESOURCE_AREA);)
566 return res;
567 }
569 void* operator new [](size_t size) {
570 address res = (address)resource_allocate_bytes(size);
571 DEBUG_ONLY(set_allocation_type(res, RESOURCE_AREA);)
572 return res;
573 }
575 void* operator new [](size_t size, const std::nothrow_t& nothrow_constant) {
576 address res = (address)resource_allocate_bytes(size, AllocFailStrategy::RETURN_NULL);
577 DEBUG_ONLY(if (res != NULL) set_allocation_type(res, RESOURCE_AREA);)
578 return res;
579 }
581 void operator delete(void* p);
582 void operator delete [](void* p);
583 };
585 // One of the following macros must be used when allocating an array
586 // or object to determine whether it should reside in the C heap on in
587 // the resource area.
589 #define NEW_RESOURCE_ARRAY(type, size)\
590 (type*) resource_allocate_bytes((size) * sizeof(type))
592 #define NEW_RESOURCE_ARRAY_RETURN_NULL(type, size)\
593 (type*) resource_allocate_bytes((size) * sizeof(type), AllocFailStrategy::RETURN_NULL)
595 #define NEW_RESOURCE_ARRAY_IN_THREAD(thread, type, size)\
596 (type*) resource_allocate_bytes(thread, (size) * sizeof(type))
598 #define REALLOC_RESOURCE_ARRAY(type, old, old_size, new_size)\
599 (type*) resource_reallocate_bytes((char*)(old), (old_size) * sizeof(type), (new_size) * sizeof(type) )
601 #define FREE_RESOURCE_ARRAY(type, old, size)\
602 resource_free_bytes((char*)(old), (size) * sizeof(type))
604 #define FREE_FAST(old)\
605 /* nop */
607 #define NEW_RESOURCE_OBJ(type)\
608 NEW_RESOURCE_ARRAY(type, 1)
610 #define NEW_C_HEAP_ARRAY(type, size, memflags)\
611 (type*) (AllocateHeap((size) * sizeof(type), memflags))
613 #define REALLOC_C_HEAP_ARRAY(type, old, size, memflags)\
614 (type*) (ReallocateHeap((char*)old, (size) * sizeof(type), memflags))
616 #define FREE_C_HEAP_ARRAY(type, old, memflags) \
617 FreeHeap((char*)(old), memflags)
619 #define NEW_C_HEAP_ARRAY2(type, size, memflags, pc)\
620 (type*) (AllocateHeap((size) * sizeof(type), memflags, pc))
622 #define REALLOC_C_HEAP_ARRAY2(type, old, size, memflags, pc)\
623 (type*) (ReallocateHeap((char*)old, (size) * sizeof(type), memflags, pc))
625 #define NEW_C_HEAP_ARRAY3(type, size, memflags, pc, allocfail) \
626 (type*) AllocateHeap(size * sizeof(type), memflags, pc, allocfail)
628 // allocate type in heap without calling ctor
629 #define NEW_C_HEAP_OBJ(type, memflags)\
630 NEW_C_HEAP_ARRAY(type, 1, memflags)
632 // deallocate obj of type in heap without calling dtor
633 #define FREE_C_HEAP_OBJ(objname, memflags)\
634 FreeHeap((char*)objname, memflags);
636 // for statistics
637 #ifndef PRODUCT
638 class AllocStats : StackObj {
639 julong start_mallocs, start_frees;
640 julong start_malloc_bytes, start_mfree_bytes, start_res_bytes;
641 public:
642 AllocStats();
644 julong num_mallocs(); // since creation of receiver
645 julong alloc_bytes();
646 julong num_frees();
647 julong free_bytes();
648 julong resource_bytes();
649 void print();
650 };
651 #endif
654 //------------------------------ReallocMark---------------------------------
655 // Code which uses REALLOC_RESOURCE_ARRAY should check an associated
656 // ReallocMark, which is declared in the same scope as the reallocated
657 // pointer. Any operation that could __potentially__ cause a reallocation
658 // should check the ReallocMark.
659 class ReallocMark: public StackObj {
660 protected:
661 NOT_PRODUCT(int _nesting;)
663 public:
664 ReallocMark() PRODUCT_RETURN;
665 void check() PRODUCT_RETURN;
666 };
668 // Helper class to allocate arrays that may become large.
669 // Uses the OS malloc for allocations smaller than ArrayAllocatorMallocLimit
670 // and uses mapped memory for larger allocations.
671 // Most OS mallocs do something similar but Solaris malloc does not revert
672 // to mapped memory for large allocations. By default ArrayAllocatorMallocLimit
673 // is set so that we always use malloc except for Solaris where we set the
674 // limit to get mapped memory.
675 template <class E, MEMFLAGS F>
676 class ArrayAllocator : StackObj {
677 char* _addr;
678 bool _use_malloc;
679 size_t _size;
680 public:
681 ArrayAllocator() : _addr(NULL), _use_malloc(false), _size(0) { }
682 ~ArrayAllocator() { free(); }
683 E* allocate(size_t length);
684 void free();
685 };
687 #endif // SHARE_VM_MEMORY_ALLOCATION_HPP