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