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 // The byte alignment to be used by Arena::Amalloc. See bugid 4169348.
41 // Note: this value must be a power of 2
42
43 #define ARENA_AMALLOC_ALIGNMENT (2*BytesPerWord)
44
45 #define ARENA_ALIGN_M1 (((size_t)(ARENA_AMALLOC_ALIGNMENT)) - 1)
46 #define ARENA_ALIGN_MASK (~((size_t)ARENA_ALIGN_M1))
47 #define ARENA_ALIGN(x) ((((size_t)(x)) + ARENA_ALIGN_M1) & ARENA_ALIGN_MASK)
48
49 class AllocFailStrategy {
50 public:
51 enum AllocFailEnum { EXIT_OOM, RETURN_NULL };
52 };
53 typedef AllocFailStrategy::AllocFailEnum AllocFailType;
54
55 // All classes in the virtual machine must be subclassed
56 // by one of the following allocation classes:
57 //
58 // For objects allocated in the resource area (see resourceArea.hpp).
59 // - ResourceObj
60 //
61 // For objects allocated in the C-heap (managed by: free & malloc).
62 // - CHeapObj
63 //
64 // For objects allocated on the stack.
65 // - StackObj
66 //
67 // For embedded objects.
68 // - ValueObj
69 //
70 // For classes used as name spaces.
71 // - AllStatic
72 //
73 // For classes in Metaspace (class data)
74 // - MetaspaceObj
75 //
76 // The printable subclasses are used for debugging and define virtual
77 // member functions for printing. Classes that avoid allocating the
78 // vtbl entries in the objects should therefore not be the printable
79 // subclasses.
80 //
81 // The following macros and function should be used to allocate memory
82 // directly in the resource area or in the C-heap, The _OBJ variants
83 // of the NEW/FREE_C_HEAP macros are used for alloc/dealloc simple
84 // objects which are not inherited from CHeapObj, note constructor and
85 // destructor are not called. The preferable way to allocate objects
86 // is using the new operator.
87 //
88 // WARNING: The array variant must only be used for a homogenous array
89 // where all objects are of the exact type specified. If subtypes are
90 // stored in the array then must pay attention to calling destructors
91 // at needed.
92 //
93 // NEW_RESOURCE_ARRAY(type, size)
94 // NEW_RESOURCE_OBJ(type)
95 // NEW_C_HEAP_ARRAY(type, size)
96 // NEW_C_HEAP_OBJ(type, memflags)
97 // FREE_C_HEAP_ARRAY(type, old)
98 // FREE_C_HEAP_OBJ(objname, type, memflags)
99 // char* AllocateHeap(size_t size, const char* name);
100 // void FreeHeap(void* p);
101 //
102 // C-heap allocation can be traced using +PrintHeapAllocation.
103 // malloc and free should therefore never called directly.
104
105 // Base class for objects allocated in the C-heap.
106
107 // In non product mode we introduce a super class for all allocation classes
108 // that supports printing.
109 // We avoid the superclass in product mode since some C++ compilers add
110 // a word overhead for empty super classes.
111
112 #ifdef PRODUCT
113 #define ALLOCATION_SUPER_CLASS_SPEC
114 #else
115 #define ALLOCATION_SUPER_CLASS_SPEC : public AllocatedObj
116 class AllocatedObj {
117 public:
118 // Printing support
119 void print() const;
120 void print_value() const;
121
122 virtual void print_on(outputStream* st) const;
123 virtual void print_value_on(outputStream* st) const;
124 };
125 #endif
126
127
128 /*
129 * Memory types
130 */
131 enum MemoryType {
132 // Memory type by sub systems. It occupies lower byte.
133 mtJavaHeap = 0x00, // Java heap
134 mtClass = 0x01, // memory class for Java classes
135 mtThread = 0x02, // memory for thread objects
136 mtThreadStack = 0x03,
137 mtCode = 0x04, // memory for generated code
138 mtGC = 0x05, // memory for GC
139 mtCompiler = 0x06, // memory for compiler
140 mtInternal = 0x07, // memory used by VM, but does not belong to
141 // any of above categories, and not used for
142 // native memory tracking
143 mtOther = 0x08, // memory not used by VM
144 mtSymbol = 0x09, // symbol
145 mtNMT = 0x0A, // memory used by native memory tracking
146 mtClassShared = 0x0B, // class data sharing
147 mtChunk = 0x0C, // chunk that holds content of arenas
148 mtTest = 0x0D, // Test type for verifying NMT
149 mtTracing = 0x0E, // memory used for Tracing
150 mtLogging = 0x0F, // memory for logging
151 mtArguments = 0x10, // memory for argument processing
152 mtModule = 0x11, // memory for module processing
153 mtNone = 0x12, // undefined
154 mt_number_of_types = 0x13 // number of memory types (mtDontTrack
155 // is not included as validate type)
156 };
157
158 typedef MemoryType MEMFLAGS;
159
160
161 #if INCLUDE_NMT
162
163 extern bool NMT_track_callsite;
164
165 #else
166
167 const bool NMT_track_callsite = false;
168
169 #endif // INCLUDE_NMT
170
171 class NativeCallStack;
172
173
174 template <MEMFLAGS F> class CHeapObj ALLOCATION_SUPER_CLASS_SPEC {
175 public:
176 NOINLINE void* operator new(size_t size, const NativeCallStack& stack) throw();
177 NOINLINE void* operator new(size_t size) throw();
178 NOINLINE void* operator new (size_t size, const std::nothrow_t& nothrow_constant,
179 const NativeCallStack& stack) throw();
180 NOINLINE void* operator new (size_t size, const std::nothrow_t& nothrow_constant)
181 throw();
182 NOINLINE void* operator new [](size_t size, const NativeCallStack& stack) throw();
183 NOINLINE void* operator new [](size_t size) throw();
184 NOINLINE void* operator new [](size_t size, const std::nothrow_t& nothrow_constant,
185 const NativeCallStack& stack) throw();
186 NOINLINE void* operator new [](size_t size, const std::nothrow_t& nothrow_constant)
187 throw();
188 void operator delete(void* p);
189 void operator delete [] (void* p);
190 };
191
192 // Base class for objects allocated on the stack only.
193 // Calling new or delete will result in fatal error.
194
195 class StackObj ALLOCATION_SUPER_CLASS_SPEC {
196 private:
197 void* operator new(size_t size) throw();
198 void* operator new [](size_t size) throw();
199 #ifdef __IBMCPP__
200 public:
201 #endif
202 void operator delete(void* p);
203 void operator delete [](void* p);
204 };
205
206 // Base class for objects used as value objects.
207 // Calling new or delete will result in fatal error.
208 //
209 // Portability note: Certain compilers (e.g. gcc) will
210 // always make classes bigger if it has a superclass, even
211 // if the superclass does not have any virtual methods or
212 // instance fields. The HotSpot implementation relies on this
213 // not to happen. So never make a ValueObj class a direct subclass
214 // of this object, but use the VALUE_OBJ_CLASS_SPEC class instead, e.g.,
215 // like this:
216 //
217 // class A VALUE_OBJ_CLASS_SPEC {
218 // ...
219 // }
220 //
221 // With gcc and possible other compilers the VALUE_OBJ_CLASS_SPEC can
222 // be defined as a an empty string "".
223 //
224 class _ValueObj {
225 private:
226 void* operator new(size_t size) throw();
227 void operator delete(void* p);
228 void* operator new [](size_t size) throw();
229 void operator delete [](void* p);
230 };
231
232
233 // Base class for objects stored in Metaspace.
234 // Calling delete will result in fatal error.
235 //
236 // Do not inherit from something with a vptr because this class does
237 // not introduce one. This class is used to allocate both shared read-only
238 // and shared read-write classes.
239 //
240
241 class ClassLoaderData;
242
243 class MetaspaceObj {
244 public:
245 bool is_metaspace_object() const;
246 bool is_shared() const;
247 void print_address_on(outputStream* st) const; // nonvirtual address printing
248
249 #define METASPACE_OBJ_TYPES_DO(f) \
250 f(Unknown) \
251 f(Class) \
252 f(Symbol) \
253 f(TypeArrayU1) \
254 f(TypeArrayU2) \
255 f(TypeArrayU4) \
256 f(TypeArrayU8) \
257 f(TypeArrayOther) \
258 f(Method) \
259 f(ConstMethod) \
260 f(MethodData) \
261 f(ConstantPool) \
262 f(ConstantPoolCache) \
263 f(Annotation) \
264 f(MethodCounters) \
265 f(Deallocated)
266
267 #define METASPACE_OBJ_TYPE_DECLARE(name) name ## Type,
268 #define METASPACE_OBJ_TYPE_NAME_CASE(name) case name ## Type: return #name;
269
270 enum Type {
271 // Types are MetaspaceObj::ClassType, MetaspaceObj::SymbolType, etc
272 METASPACE_OBJ_TYPES_DO(METASPACE_OBJ_TYPE_DECLARE)
273 _number_of_types
274 };
275
276 static const char * type_name(Type type) {
277 switch(type) {
278 METASPACE_OBJ_TYPES_DO(METASPACE_OBJ_TYPE_NAME_CASE)
279 default:
280 ShouldNotReachHere();
281 return NULL;
282 }
283 }
284
285 static MetaspaceObj::Type array_type(size_t elem_size) {
286 switch (elem_size) {
287 case 1: return TypeArrayU1Type;
288 case 2: return TypeArrayU2Type;
289 case 4: return TypeArrayU4Type;
290 case 8: return TypeArrayU8Type;
291 default:
292 return TypeArrayOtherType;
293 }
294 }
295
296 void* operator new(size_t size, ClassLoaderData* loader_data,
297 size_t word_size, bool read_only,
298 Type type, Thread* thread) throw();
299 // can't use TRAPS from this header file.
300 void operator delete(void* p) { ShouldNotCallThis(); }
301 };
302
303 // Base class for classes that constitute name spaces.
304
305 class AllStatic {
306 public:
307 AllStatic() { ShouldNotCallThis(); }
308 ~AllStatic() { ShouldNotCallThis(); }
309 };
310
311
312 //------------------------------Chunk------------------------------------------
313 // Linked list of raw memory chunks
314 class Chunk: CHeapObj<mtChunk> {
315 friend class VMStructs;
316
317 protected:
318 Chunk* _next; // Next Chunk in list
319 const size_t _len; // Size of this Chunk
320 public:
321 void* operator new(size_t size, AllocFailType alloc_failmode, size_t length) throw();
322 void operator delete(void* p);
323 Chunk(size_t length);
324
325 enum {
326 // default sizes; make them slightly smaller than 2**k to guard against
327 // buddy-system style malloc implementations
328 #ifdef _LP64
329 slack = 40, // [RGV] Not sure if this is right, but make it
330 // a multiple of 8.
331 #else
332 slack = 20, // suspected sizeof(Chunk) + internal malloc headers
333 #endif
334
335 tiny_size = 256 - slack, // Size of first chunk (tiny)
336 init_size = 1*K - slack, // Size of first chunk (normal aka small)
337 medium_size= 10*K - slack, // Size of medium-sized chunk
338 size = 32*K - slack, // Default size of an Arena chunk (following the first)
339 non_pool_size = init_size + 32 // An initial size which is not one of above
340 };
341
342 void chop(); // Chop this chunk
343 void next_chop(); // Chop next chunk
344 static size_t aligned_overhead_size(void) { return ARENA_ALIGN(sizeof(Chunk)); }
345 static size_t aligned_overhead_size(size_t byte_size) { return ARENA_ALIGN(byte_size); }
346
347 size_t length() const { return _len; }
348 Chunk* next() const { return _next; }
349 void set_next(Chunk* n) { _next = n; }
350 // Boundaries of data area (possibly unused)
351 char* bottom() const { return ((char*) this) + aligned_overhead_size(); }
352 char* top() const { return bottom() + _len; }
353 bool contains(char* p) const { return bottom() <= p && p <= top(); }
354
355 // Start the chunk_pool cleaner task
356 static void start_chunk_pool_cleaner_task();
357
358 static void clean_chunk_pool();
359 };
360
361 //------------------------------Arena------------------------------------------
362 // Fast allocation of memory
363 class Arena : public CHeapObj<mtNone> {
364 protected:
365 friend class ResourceMark;
366 friend class HandleMark;
367 friend class NoHandleMark;
368 friend class VMStructs;
369
370 MEMFLAGS _flags; // Memory tracking flags
371
372 Chunk *_first; // First chunk
373 Chunk *_chunk; // current chunk
374 char *_hwm, *_max; // High water mark and max in current chunk
375 // Get a new Chunk of at least size x
376 void* grow(size_t x, AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM);
377 size_t _size_in_bytes; // Size of arena (used for native memory tracking)
378
379 NOT_PRODUCT(static julong _bytes_allocated;) // total #bytes allocated since start
380 friend class AllocStats;
381 debug_only(void* malloc(size_t size);)
382 debug_only(void* internal_malloc_4(size_t x);)
383 NOT_PRODUCT(void inc_bytes_allocated(size_t x);)
384
385 void signal_out_of_memory(size_t request, const char* whence) const;
386
387 bool check_for_overflow(size_t request, const char* whence,
388 AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM) const {
389 if (UINTPTR_MAX - request < (uintptr_t)_hwm) {
390 if (alloc_failmode == AllocFailStrategy::RETURN_NULL) {
391 return false;
392 }
393 signal_out_of_memory(request, whence);
394 }
395 return true;
396 }
397
398 public:
399 Arena(MEMFLAGS memflag);
400 Arena(MEMFLAGS memflag, size_t init_size);
401 ~Arena();
402 void destruct_contents();
403 char* hwm() const { return _hwm; }
404
405 // new operators
406 void* operator new (size_t size) throw();
407 void* operator new (size_t size, const std::nothrow_t& nothrow_constant) throw();
408
409 // dynamic memory type tagging
410 void* operator new(size_t size, MEMFLAGS flags) throw();
411 void* operator new(size_t size, const std::nothrow_t& nothrow_constant, MEMFLAGS flags) throw();
412 void operator delete(void* p);
413
414 // Fast allocate in the arena. Common case is: pointer test + increment.
415 void* Amalloc(size_t x, AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM) {
416 assert(is_power_of_2(ARENA_AMALLOC_ALIGNMENT) , "should be a power of 2");
417 x = ARENA_ALIGN(x);
418 debug_only(if (UseMallocOnly) return malloc(x);)
419 if (!check_for_overflow(x, "Arena::Amalloc", alloc_failmode))
420 return NULL;
421 NOT_PRODUCT(inc_bytes_allocated(x);)
422 if (_hwm + x > _max) {
423 return grow(x, alloc_failmode);
424 } else {
425 char *old = _hwm;
426 _hwm += x;
427 return old;
428 }
429 }
430 // Further assume size is padded out to words
431 void *Amalloc_4(size_t x, AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM) {
432 assert( (x&(sizeof(char*)-1)) == 0, "misaligned size" );
433 debug_only(if (UseMallocOnly) return malloc(x);)
434 if (!check_for_overflow(x, "Arena::Amalloc_4", alloc_failmode))
435 return NULL;
436 NOT_PRODUCT(inc_bytes_allocated(x);)
437 if (_hwm + x > _max) {
438 return grow(x, alloc_failmode);
439 } else {
440 char *old = _hwm;
441 _hwm += x;
442 return old;
443 }
444 }
445
446 // Allocate with 'double' alignment. It is 8 bytes on sparc.
447 // In other cases Amalloc_D() should be the same as Amalloc_4().
448 void* Amalloc_D(size_t x, AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM) {
449 assert( (x&(sizeof(char*)-1)) == 0, "misaligned size" );
450 debug_only(if (UseMallocOnly) return malloc(x);)
451 #if defined(SPARC) && !defined(_LP64)
452 #define DALIGN_M1 7
453 size_t delta = (((size_t)_hwm + DALIGN_M1) & ~DALIGN_M1) - (size_t)_hwm;
454 x += delta;
455 #endif
456 if (!check_for_overflow(x, "Arena::Amalloc_D", alloc_failmode))
457 return NULL;
458 NOT_PRODUCT(inc_bytes_allocated(x);)
459 if (_hwm + x > _max) {
460 return grow(x, alloc_failmode); // grow() returns a result aligned >= 8 bytes.
461 } else {
462 char *old = _hwm;
463 _hwm += x;
464 #if defined(SPARC) && !defined(_LP64)
465 old += delta; // align to 8-bytes
466 #endif
467 return old;
468 }
469 }
470
471 // Fast delete in area. Common case is: NOP (except for storage reclaimed)
472 void Afree(void *ptr, size_t size) {
473 #ifdef ASSERT
474 if (ZapResourceArea) memset(ptr, badResourceValue, size); // zap freed memory
475 if (UseMallocOnly) return;
476 #endif
477 if (((char*)ptr) + size == _hwm) _hwm = (char*)ptr;
478 }
479
480 void *Arealloc( void *old_ptr, size_t old_size, size_t new_size,
481 AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM);
482
483 // Move contents of this arena into an empty arena
484 Arena *move_contents(Arena *empty_arena);
485
486 // Determine if pointer belongs to this Arena or not.
487 bool contains( const void *ptr ) const;
488
489 // Total of all chunks in use (not thread-safe)
490 size_t used() const;
491
492 // Total # of bytes used
493 size_t size_in_bytes() const { return _size_in_bytes; };
494 void set_size_in_bytes(size_t size);
495
496 static void free_malloced_objects(Chunk* chunk, char* hwm, char* max, char* hwm2) PRODUCT_RETURN;
497 static void free_all(char** start, char** end) PRODUCT_RETURN;
498
499 private:
500 // Reset this Arena to empty, access will trigger grow if necessary
501 void reset(void) {
502 _first = _chunk = NULL;
503 _hwm = _max = NULL;
504 set_size_in_bytes(0);
505 }
506 };
507
508 // One of the following macros must be used when allocating
509 // an array or object from an arena
510 #define NEW_ARENA_ARRAY(arena, type, size) \
511 (type*) (arena)->Amalloc((size) * sizeof(type))
512
513 #define REALLOC_ARENA_ARRAY(arena, type, old, old_size, new_size) \
514 (type*) (arena)->Arealloc((char*)(old), (old_size) * sizeof(type), \
515 (new_size) * sizeof(type) )
516
517 #define FREE_ARENA_ARRAY(arena, type, old, size) \
518 (arena)->Afree((char*)(old), (size) * sizeof(type))
519
520 #define NEW_ARENA_OBJ(arena, type) \
521 NEW_ARENA_ARRAY(arena, type, 1)
522
523
524 //%note allocation_1
525 extern char* resource_allocate_bytes(size_t size,
526 AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM);
527 extern char* resource_allocate_bytes(Thread* thread, size_t size,
528 AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM);
529 extern char* resource_reallocate_bytes( char *old, size_t old_size, size_t new_size,
530 AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM);
531 extern void resource_free_bytes( char *old, size_t size );
532
533 //----------------------------------------------------------------------
534 // Base class for objects allocated in the resource area per default.
535 // Optionally, objects may be allocated on the C heap with
536 // new(ResourceObj::C_HEAP) Foo(...) or in an Arena with new (&arena)
537 // ResourceObj's can be allocated within other objects, but don't use
538 // new or delete (allocation_type is unknown). If new is used to allocate,
539 // use delete to deallocate.
540 class ResourceObj ALLOCATION_SUPER_CLASS_SPEC {
541 public:
542 enum allocation_type { STACK_OR_EMBEDDED = 0, RESOURCE_AREA, C_HEAP, ARENA, allocation_mask = 0x3 };
543 static void set_allocation_type(address res, allocation_type type) NOT_DEBUG_RETURN;
544 #ifdef ASSERT
545 private:
546 // When this object is allocated on stack the new() operator is not
547 // called but garbage on stack may look like a valid allocation_type.
548 // Store negated 'this' pointer when new() is called to distinguish cases.
549 // Use second array's element for verification value to distinguish garbage.
550 uintptr_t _allocation_t[2];
551 bool is_type_set() const;
552 public:
553 allocation_type get_allocation_type() const;
554 bool allocated_on_stack() const { return get_allocation_type() == STACK_OR_EMBEDDED; }
555 bool allocated_on_res_area() const { return get_allocation_type() == RESOURCE_AREA; }
556 bool allocated_on_C_heap() const { return get_allocation_type() == C_HEAP; }
557 bool allocated_on_arena() const { return get_allocation_type() == ARENA; }
558 ResourceObj(); // default constructor
559 ResourceObj(const ResourceObj& r); // default copy constructor
560 ResourceObj& operator=(const ResourceObj& r); // default copy assignment
561 ~ResourceObj();
562 #endif // ASSERT
563
564 public:
565 void* operator new(size_t size, allocation_type type, MEMFLAGS flags) throw();
566 void* operator new [](size_t size, allocation_type type, MEMFLAGS flags) throw();
567 void* operator new(size_t size, const std::nothrow_t& nothrow_constant,
568 allocation_type type, MEMFLAGS flags) throw();
569 void* operator new [](size_t size, const std::nothrow_t& nothrow_constant,
570 allocation_type type, MEMFLAGS flags) throw();
571
572 void* operator new(size_t size, Arena *arena) throw() {
573 address res = (address)arena->Amalloc(size);
574 DEBUG_ONLY(set_allocation_type(res, ARENA);)
575 return res;
576 }
577
578 void* operator new [](size_t size, Arena *arena) throw() {
579 address res = (address)arena->Amalloc(size);
580 DEBUG_ONLY(set_allocation_type(res, ARENA);)
581 return res;
582 }
583
584 void* operator new(size_t size) throw() {
585 address res = (address)resource_allocate_bytes(size);
586 DEBUG_ONLY(set_allocation_type(res, RESOURCE_AREA);)
587 return res;
588 }
589
590 void* operator new(size_t size, const std::nothrow_t& nothrow_constant) throw() {
591 address res = (address)resource_allocate_bytes(size, AllocFailStrategy::RETURN_NULL);
592 DEBUG_ONLY(if (res != NULL) set_allocation_type(res, RESOURCE_AREA);)
593 return res;
594 }
595
596 void* operator new [](size_t size) throw() {
597 address res = (address)resource_allocate_bytes(size);
598 DEBUG_ONLY(set_allocation_type(res, RESOURCE_AREA);)
599 return res;
600 }
601
602 void* operator new [](size_t size, const std::nothrow_t& nothrow_constant) throw() {
603 address res = (address)resource_allocate_bytes(size, AllocFailStrategy::RETURN_NULL);
604 DEBUG_ONLY(if (res != NULL) set_allocation_type(res, RESOURCE_AREA);)
605 return res;
606 }
607
608 void operator delete(void* p);
609 void operator delete [](void* p);
610 };
611
612 // One of the following macros must be used when allocating an array
613 // or object to determine whether it should reside in the C heap on in
614 // the resource area.
615
616 #define NEW_RESOURCE_ARRAY(type, size)\
617 (type*) resource_allocate_bytes((size) * sizeof(type))
618
619 #define NEW_RESOURCE_ARRAY_RETURN_NULL(type, size)\
620 (type*) resource_allocate_bytes((size) * sizeof(type), AllocFailStrategy::RETURN_NULL)
621
622 #define NEW_RESOURCE_ARRAY_IN_THREAD(thread, type, size)\
623 (type*) resource_allocate_bytes(thread, (size) * sizeof(type))
624
625 #define NEW_RESOURCE_ARRAY_IN_THREAD_RETURN_NULL(thread, type, size)\
626 (type*) resource_allocate_bytes(thread, (size) * sizeof(type), AllocFailStrategy::RETURN_NULL)
627
628 #define REALLOC_RESOURCE_ARRAY(type, old, old_size, new_size)\
629 (type*) resource_reallocate_bytes((char*)(old), (old_size) * sizeof(type), (new_size) * sizeof(type))
630
631 #define REALLOC_RESOURCE_ARRAY_RETURN_NULL(type, old, old_size, new_size)\
632 (type*) resource_reallocate_bytes((char*)(old), (old_size) * sizeof(type),\
633 (new_size) * sizeof(type), AllocFailStrategy::RETURN_NULL)
634
635 #define FREE_RESOURCE_ARRAY(type, old, size)\
636 resource_free_bytes((char*)(old), (size) * sizeof(type))
637
638 #define FREE_FAST(old)\
639 /* nop */
640
641 #define NEW_RESOURCE_OBJ(type)\
642 NEW_RESOURCE_ARRAY(type, 1)
643
644 #define NEW_RESOURCE_OBJ_RETURN_NULL(type)\
645 NEW_RESOURCE_ARRAY_RETURN_NULL(type, 1)
646
647 #define NEW_C_HEAP_ARRAY3(type, size, memflags, pc, allocfail)\
648 (type*) AllocateHeap((size) * sizeof(type), memflags, pc, allocfail)
649
650 #define NEW_C_HEAP_ARRAY2(type, size, memflags, pc)\
651 (type*) (AllocateHeap((size) * sizeof(type), memflags, pc))
652
653 #define NEW_C_HEAP_ARRAY(type, size, memflags)\
654 (type*) (AllocateHeap((size) * sizeof(type), memflags))
655
656 #define NEW_C_HEAP_ARRAY2_RETURN_NULL(type, size, memflags, pc)\
657 NEW_C_HEAP_ARRAY3(type, (size), memflags, pc, AllocFailStrategy::RETURN_NULL)
658
659 #define NEW_C_HEAP_ARRAY_RETURN_NULL(type, size, memflags)\
660 NEW_C_HEAP_ARRAY3(type, (size), memflags, CURRENT_PC, AllocFailStrategy::RETURN_NULL)
661
662 #define REALLOC_C_HEAP_ARRAY(type, old, size, memflags)\
663 (type*) (ReallocateHeap((char*)(old), (size) * sizeof(type), memflags))
664
665 #define REALLOC_C_HEAP_ARRAY_RETURN_NULL(type, old, size, memflags)\
666 (type*) (ReallocateHeap((char*)(old), (size) * sizeof(type), memflags, AllocFailStrategy::RETURN_NULL))
667
668 #define FREE_C_HEAP_ARRAY(type, old) \
669 FreeHeap((char*)(old))
670
671 // allocate type in heap without calling ctor
672 #define NEW_C_HEAP_OBJ(type, memflags)\
673 NEW_C_HEAP_ARRAY(type, 1, memflags)
674
675 #define NEW_C_HEAP_OBJ_RETURN_NULL(type, memflags)\
676 NEW_C_HEAP_ARRAY_RETURN_NULL(type, 1, memflags)
677
678 // deallocate obj of type in heap without calling dtor
679 #define FREE_C_HEAP_OBJ(objname)\
680 FreeHeap((char*)objname);
681
682 // for statistics
683 #ifndef PRODUCT
684 class AllocStats : StackObj {
685 julong start_mallocs, start_frees;
686 julong start_malloc_bytes, start_mfree_bytes, start_res_bytes;
687 public:
688 AllocStats();
689
690 julong num_mallocs(); // since creation of receiver
691 julong alloc_bytes();
692 julong num_frees();
693 julong free_bytes();
694 julong resource_bytes();
695 void print();
696 };
697 #endif
698
699
700 //------------------------------ReallocMark---------------------------------
701 // Code which uses REALLOC_RESOURCE_ARRAY should check an associated
702 // ReallocMark, which is declared in the same scope as the reallocated
703 // pointer. Any operation that could __potentially__ cause a reallocation
704 // should check the ReallocMark.
705 class ReallocMark: public StackObj {
706 protected:
707 NOT_PRODUCT(int _nesting;)
708
709 public:
710 ReallocMark() PRODUCT_RETURN;
711 void check() PRODUCT_RETURN;
712 };
713
714 // Helper class to allocate arrays that may become large.
715 // Uses the OS malloc for allocations smaller than ArrayAllocatorMallocLimit
716 // and uses mapped memory for larger allocations.
717 // Most OS mallocs do something similar but Solaris malloc does not revert
718 // to mapped memory for large allocations. By default ArrayAllocatorMallocLimit
719 // is set so that we always use malloc except for Solaris where we set the
720 // limit to get mapped memory.
721 template <class E, MEMFLAGS F>
722 class ArrayAllocator : public AllStatic {
723 private:
724 static bool should_use_malloc(size_t length);
725
726 static E* allocate_malloc(size_t length);
727 static E* allocate_mmap(size_t length);
728
729 static void free_malloc(E* addr, size_t length);
730 static void free_mmap(E* addr, size_t length);
731
732 public:
733 static E* allocate(size_t length);
734 static E* reallocate(E* old_addr, size_t old_length, size_t new_length);
735 static void free(E* addr, size_t length);
736 };
737
738 // Uses mmaped memory for all allocations. All allocations are initially
739 // zero-filled. No pre-touching.
740 template <class E, MEMFLAGS F>
741 class MmapArrayAllocator : public AllStatic {
742 private:
743 static size_t size_for(size_t length);
744
745 public:
746 static E* allocate_or_null(size_t length);
747 static E* allocate(size_t length);
748 static void free(E* addr, size_t length);
749 };
750
751 // Uses malloc:ed memory for all allocations.
752 template <class E, MEMFLAGS F>
753 class MallocArrayAllocator : public AllStatic {
754 public:
755 static size_t size_for(size_t length);
756
757 static E* allocate(size_t length);
758 static void free(E* addr, size_t length);
759 };
760
761 #endif // SHARE_VM_MEMORY_ALLOCATION_HPP