Thu, 13 Jun 2013 22:02:40 -0700
8014431: cleanup warnings indicated by the -Wunused-value compiler option on linux
Reviewed-by: dholmes, coleenp
Contributed-by: jeremymanson@google.com, calvin.cheung@oracle.com
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 mtTracing = 0x0F00, // memory used for Tracing
161 mt_number_of_types = 0x000F, // number of memory types (mtDontTrack
162 // is not included as validate type)
163 mtDontTrack = 0x0F00, // memory we do not or cannot track
164 mt_masks = 0x7F00,
166 // object type mask
167 otArena = 0x0010, // an arena object
168 otNMTRecorder = 0x0020, // memory recorder object
169 ot_masks = 0x00F0
170 };
172 #define IS_MEMORY_TYPE(flags, type) ((flags & mt_masks) == type)
173 #define HAS_VALID_MEMORY_TYPE(flags)((flags & mt_masks) != mtNone)
174 #define FLAGS_TO_MEMORY_TYPE(flags) (flags & mt_masks)
176 #define IS_ARENA_OBJ(flags) ((flags & ot_masks) == otArena)
177 #define IS_NMT_RECORDER(flags) ((flags & ot_masks) == otNMTRecorder)
178 #define NMT_CAN_TRACK(flags) (!IS_NMT_RECORDER(flags) && !(IS_MEMORY_TYPE(flags, mtDontTrack)))
180 typedef unsigned short MEMFLAGS;
182 #if INCLUDE_NMT
184 extern bool NMT_track_callsite;
186 #else
188 const bool NMT_track_callsite = false;
190 #endif // INCLUDE_NMT
192 // debug build does not inline
193 #if defined(_NMT_NOINLINE_)
194 #define CURRENT_PC (NMT_track_callsite ? os::get_caller_pc(1) : 0)
195 #define CALLER_PC (NMT_track_callsite ? os::get_caller_pc(2) : 0)
196 #define CALLER_CALLER_PC (NMT_track_callsite ? os::get_caller_pc(3) : 0)
197 #else
198 #define CURRENT_PC (NMT_track_callsite? os::get_caller_pc(0) : 0)
199 #define CALLER_PC (NMT_track_callsite ? os::get_caller_pc(1) : 0)
200 #define CALLER_CALLER_PC (NMT_track_callsite ? os::get_caller_pc(2) : 0)
201 #endif
205 template <MEMFLAGS F> class CHeapObj ALLOCATION_SUPER_CLASS_SPEC {
206 public:
207 _NOINLINE_ void* operator new(size_t size, address caller_pc = 0);
208 _NOINLINE_ void* operator new (size_t size, const std::nothrow_t& nothrow_constant,
209 address caller_pc = 0);
210 _NOINLINE_ void* operator new [](size_t size, address caller_pc = 0);
211 _NOINLINE_ void* operator new [](size_t size, const std::nothrow_t& nothrow_constant,
212 address caller_pc = 0);
213 void operator delete(void* p);
214 void operator delete [] (void* p);
215 };
217 // Base class for objects allocated on the stack only.
218 // Calling new or delete will result in fatal error.
220 class StackObj ALLOCATION_SUPER_CLASS_SPEC {
221 private:
222 void* operator new(size_t size);
223 void operator delete(void* p);
224 void* operator new [](size_t size);
225 void operator delete [](void* p);
226 };
228 // Base class for objects used as value objects.
229 // Calling new or delete will result in fatal error.
230 //
231 // Portability note: Certain compilers (e.g. gcc) will
232 // always make classes bigger if it has a superclass, even
233 // if the superclass does not have any virtual methods or
234 // instance fields. The HotSpot implementation relies on this
235 // not to happen. So never make a ValueObj class a direct subclass
236 // of this object, but use the VALUE_OBJ_CLASS_SPEC class instead, e.g.,
237 // like this:
238 //
239 // class A VALUE_OBJ_CLASS_SPEC {
240 // ...
241 // }
242 //
243 // With gcc and possible other compilers the VALUE_OBJ_CLASS_SPEC can
244 // be defined as a an empty string "".
245 //
246 class _ValueObj {
247 private:
248 void* operator new(size_t size);
249 void operator delete(void* p);
250 void* operator new [](size_t size);
251 void operator delete [](void* p);
252 };
255 // Base class for objects stored in Metaspace.
256 // Calling delete will result in fatal error.
257 //
258 // Do not inherit from something with a vptr because this class does
259 // not introduce one. This class is used to allocate both shared read-only
260 // and shared read-write classes.
261 //
263 class ClassLoaderData;
265 class MetaspaceObj {
266 public:
267 bool is_metadata() const;
268 bool is_metaspace_object() const; // more specific test but slower
269 bool is_shared() const;
270 void print_address_on(outputStream* st) const; // nonvirtual address printing
272 #define METASPACE_OBJ_TYPES_DO(f) \
273 f(Unknown) \
274 f(Class) \
275 f(Symbol) \
276 f(TypeArrayU1) \
277 f(TypeArrayU2) \
278 f(TypeArrayU4) \
279 f(TypeArrayU8) \
280 f(TypeArrayOther) \
281 f(Method) \
282 f(ConstMethod) \
283 f(MethodData) \
284 f(ConstantPool) \
285 f(ConstantPoolCache) \
286 f(Annotation) \
287 f(MethodCounters)
289 #define METASPACE_OBJ_TYPE_DECLARE(name) name ## Type,
290 #define METASPACE_OBJ_TYPE_NAME_CASE(name) case name ## Type: return #name;
292 enum Type {
293 // Types are MetaspaceObj::ClassType, MetaspaceObj::SymbolType, etc
294 METASPACE_OBJ_TYPES_DO(METASPACE_OBJ_TYPE_DECLARE)
295 _number_of_types
296 };
298 static const char * type_name(Type type) {
299 switch(type) {
300 METASPACE_OBJ_TYPES_DO(METASPACE_OBJ_TYPE_NAME_CASE)
301 default:
302 ShouldNotReachHere();
303 return NULL;
304 }
305 }
307 static MetaspaceObj::Type array_type(size_t elem_size) {
308 switch (elem_size) {
309 case 1: return TypeArrayU1Type;
310 case 2: return TypeArrayU2Type;
311 case 4: return TypeArrayU4Type;
312 case 8: return TypeArrayU8Type;
313 default:
314 return TypeArrayOtherType;
315 }
316 }
318 void* operator new(size_t size, ClassLoaderData* loader_data,
319 size_t word_size, bool read_only,
320 Type type, Thread* thread);
321 // can't use TRAPS from this header file.
322 void operator delete(void* p) { ShouldNotCallThis(); }
323 };
325 // Base class for classes that constitute name spaces.
327 class AllStatic {
328 public:
329 AllStatic() { ShouldNotCallThis(); }
330 ~AllStatic() { ShouldNotCallThis(); }
331 };
334 //------------------------------Chunk------------------------------------------
335 // Linked list of raw memory chunks
336 class Chunk: CHeapObj<mtChunk> {
337 friend class VMStructs;
339 protected:
340 Chunk* _next; // Next Chunk in list
341 const size_t _len; // Size of this Chunk
342 public:
343 void* operator new(size_t size, size_t length);
344 void operator delete(void* p);
345 Chunk(size_t length);
347 enum {
348 // default sizes; make them slightly smaller than 2**k to guard against
349 // buddy-system style malloc implementations
350 #ifdef _LP64
351 slack = 40, // [RGV] Not sure if this is right, but make it
352 // a multiple of 8.
353 #else
354 slack = 20, // suspected sizeof(Chunk) + internal malloc headers
355 #endif
357 init_size = 1*K - slack, // Size of first chunk
358 medium_size= 10*K - slack, // Size of medium-sized chunk
359 size = 32*K - slack, // Default size of an Arena chunk (following the first)
360 non_pool_size = init_size + 32 // An initial size which is not one of above
361 };
363 void chop(); // Chop this chunk
364 void next_chop(); // Chop next chunk
365 static size_t aligned_overhead_size(void) { return ARENA_ALIGN(sizeof(Chunk)); }
366 static size_t aligned_overhead_size(size_t byte_size) { return ARENA_ALIGN(byte_size); }
368 size_t length() const { return _len; }
369 Chunk* next() const { return _next; }
370 void set_next(Chunk* n) { _next = n; }
371 // Boundaries of data area (possibly unused)
372 char* bottom() const { return ((char*) this) + aligned_overhead_size(); }
373 char* top() const { return bottom() + _len; }
374 bool contains(char* p) const { return bottom() <= p && p <= top(); }
376 // Start the chunk_pool cleaner task
377 static void start_chunk_pool_cleaner_task();
379 static void clean_chunk_pool();
380 };
382 //------------------------------Arena------------------------------------------
383 // Fast allocation of memory
384 class Arena : public CHeapObj<mtNone|otArena> {
385 protected:
386 friend class ResourceMark;
387 friend class HandleMark;
388 friend class NoHandleMark;
389 friend class VMStructs;
391 Chunk *_first; // First chunk
392 Chunk *_chunk; // current chunk
393 char *_hwm, *_max; // High water mark and max in current chunk
394 // Get a new Chunk of at least size x
395 void* grow(size_t x, AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM);
396 size_t _size_in_bytes; // Size of arena (used for native memory tracking)
398 NOT_PRODUCT(static julong _bytes_allocated;) // total #bytes allocated since start
399 friend class AllocStats;
400 debug_only(void* malloc(size_t size);)
401 debug_only(void* internal_malloc_4(size_t x);)
402 NOT_PRODUCT(void inc_bytes_allocated(size_t x);)
404 void signal_out_of_memory(size_t request, const char* whence) const;
406 void check_for_overflow(size_t request, const char* whence) const {
407 if (UINTPTR_MAX - request < (uintptr_t)_hwm) {
408 signal_out_of_memory(request, whence);
409 }
410 }
412 public:
413 Arena();
414 Arena(size_t init_size);
415 ~Arena();
416 void destruct_contents();
417 char* hwm() const { return _hwm; }
419 // new operators
420 void* operator new (size_t size);
421 void* operator new (size_t size, const std::nothrow_t& nothrow_constant);
423 // dynamic memory type tagging
424 void* operator new(size_t size, MEMFLAGS flags);
425 void* operator new(size_t size, const std::nothrow_t& nothrow_constant, MEMFLAGS flags);
426 void operator delete(void* p);
428 // Fast allocate in the arena. Common case is: pointer test + increment.
429 void* Amalloc(size_t x, AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM) {
430 assert(is_power_of_2(ARENA_AMALLOC_ALIGNMENT) , "should be a power of 2");
431 x = ARENA_ALIGN(x);
432 debug_only(if (UseMallocOnly) return malloc(x);)
433 check_for_overflow(x, "Arena::Amalloc");
434 NOT_PRODUCT(inc_bytes_allocated(x);)
435 if (_hwm + x > _max) {
436 return grow(x, alloc_failmode);
437 } else {
438 char *old = _hwm;
439 _hwm += x;
440 return old;
441 }
442 }
443 // Further assume size is padded out to words
444 void *Amalloc_4(size_t x, AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM) {
445 assert( (x&(sizeof(char*)-1)) == 0, "misaligned size" );
446 debug_only(if (UseMallocOnly) return malloc(x);)
447 check_for_overflow(x, "Arena::Amalloc_4");
448 NOT_PRODUCT(inc_bytes_allocated(x);)
449 if (_hwm + x > _max) {
450 return grow(x, alloc_failmode);
451 } else {
452 char *old = _hwm;
453 _hwm += x;
454 return old;
455 }
456 }
458 // Allocate with 'double' alignment. It is 8 bytes on sparc.
459 // In other cases Amalloc_D() should be the same as Amalloc_4().
460 void* Amalloc_D(size_t x, AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM) {
461 assert( (x&(sizeof(char*)-1)) == 0, "misaligned size" );
462 debug_only(if (UseMallocOnly) return malloc(x);)
463 #if defined(SPARC) && !defined(_LP64)
464 #define DALIGN_M1 7
465 size_t delta = (((size_t)_hwm + DALIGN_M1) & ~DALIGN_M1) - (size_t)_hwm;
466 x += delta;
467 #endif
468 check_for_overflow(x, "Arena::Amalloc_D");
469 NOT_PRODUCT(inc_bytes_allocated(x);)
470 if (_hwm + x > _max) {
471 return grow(x, alloc_failmode); // grow() returns a result aligned >= 8 bytes.
472 } else {
473 char *old = _hwm;
474 _hwm += x;
475 #if defined(SPARC) && !defined(_LP64)
476 old += delta; // align to 8-bytes
477 #endif
478 return old;
479 }
480 }
482 // Fast delete in area. Common case is: NOP (except for storage reclaimed)
483 void Afree(void *ptr, size_t size) {
484 #ifdef ASSERT
485 if (ZapResourceArea) memset(ptr, badResourceValue, size); // zap freed memory
486 if (UseMallocOnly) return;
487 #endif
488 if (((char*)ptr) + size == _hwm) _hwm = (char*)ptr;
489 }
491 void *Arealloc( void *old_ptr, size_t old_size, size_t new_size,
492 AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM);
494 // Move contents of this arena into an empty arena
495 Arena *move_contents(Arena *empty_arena);
497 // Determine if pointer belongs to this Arena or not.
498 bool contains( const void *ptr ) const;
500 // Total of all chunks in use (not thread-safe)
501 size_t used() const;
503 // Total # of bytes used
504 size_t size_in_bytes() const { return _size_in_bytes; };
505 void set_size_in_bytes(size_t size);
507 static void free_malloced_objects(Chunk* chunk, char* hwm, char* max, char* hwm2) PRODUCT_RETURN;
508 static void free_all(char** start, char** end) PRODUCT_RETURN;
510 // how many arena instances
511 NOT_PRODUCT(static volatile jint _instance_count;)
512 private:
513 // Reset this Arena to empty, access will trigger grow if necessary
514 void reset(void) {
515 _first = _chunk = NULL;
516 _hwm = _max = NULL;
517 set_size_in_bytes(0);
518 }
519 };
521 // One of the following macros must be used when allocating
522 // an array or object from an arena
523 #define NEW_ARENA_ARRAY(arena, type, size) \
524 (type*) (arena)->Amalloc((size) * sizeof(type))
526 #define REALLOC_ARENA_ARRAY(arena, type, old, old_size, new_size) \
527 (type*) (arena)->Arealloc((char*)(old), (old_size) * sizeof(type), \
528 (new_size) * sizeof(type) )
530 #define FREE_ARENA_ARRAY(arena, type, old, size) \
531 (arena)->Afree((char*)(old), (size) * sizeof(type))
533 #define NEW_ARENA_OBJ(arena, type) \
534 NEW_ARENA_ARRAY(arena, type, 1)
537 //%note allocation_1
538 extern char* resource_allocate_bytes(size_t size,
539 AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM);
540 extern char* resource_allocate_bytes(Thread* thread, size_t size,
541 AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM);
542 extern char* resource_reallocate_bytes( char *old, size_t old_size, size_t new_size,
543 AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM);
544 extern void resource_free_bytes( char *old, size_t size );
546 //----------------------------------------------------------------------
547 // Base class for objects allocated in the resource area per default.
548 // Optionally, objects may be allocated on the C heap with
549 // new(ResourceObj::C_HEAP) Foo(...) or in an Arena with new (&arena)
550 // ResourceObj's can be allocated within other objects, but don't use
551 // new or delete (allocation_type is unknown). If new is used to allocate,
552 // use delete to deallocate.
553 class ResourceObj ALLOCATION_SUPER_CLASS_SPEC {
554 public:
555 enum allocation_type { STACK_OR_EMBEDDED = 0, RESOURCE_AREA, C_HEAP, ARENA, allocation_mask = 0x3 };
556 static void set_allocation_type(address res, allocation_type type) NOT_DEBUG_RETURN;
557 #ifdef ASSERT
558 private:
559 // When this object is allocated on stack the new() operator is not
560 // called but garbage on stack may look like a valid allocation_type.
561 // Store negated 'this' pointer when new() is called to distinguish cases.
562 // Use second array's element for verification value to distinguish garbage.
563 uintptr_t _allocation_t[2];
564 bool is_type_set() const;
565 public:
566 allocation_type get_allocation_type() const;
567 bool allocated_on_stack() const { return get_allocation_type() == STACK_OR_EMBEDDED; }
568 bool allocated_on_res_area() const { return get_allocation_type() == RESOURCE_AREA; }
569 bool allocated_on_C_heap() const { return get_allocation_type() == C_HEAP; }
570 bool allocated_on_arena() const { return get_allocation_type() == ARENA; }
571 ResourceObj(); // default construtor
572 ResourceObj(const ResourceObj& r); // default copy construtor
573 ResourceObj& operator=(const ResourceObj& r); // default copy assignment
574 ~ResourceObj();
575 #endif // ASSERT
577 public:
578 void* operator new(size_t size, allocation_type type, MEMFLAGS flags);
579 void* operator new [](size_t size, allocation_type type, MEMFLAGS flags);
580 void* operator new(size_t size, const std::nothrow_t& nothrow_constant,
581 allocation_type type, MEMFLAGS flags);
582 void* operator new [](size_t size, const std::nothrow_t& nothrow_constant,
583 allocation_type type, MEMFLAGS flags);
585 void* operator new(size_t size, Arena *arena) {
586 address res = (address)arena->Amalloc(size);
587 DEBUG_ONLY(set_allocation_type(res, ARENA);)
588 return res;
589 }
591 void* operator new [](size_t size, Arena *arena) {
592 address res = (address)arena->Amalloc(size);
593 DEBUG_ONLY(set_allocation_type(res, ARENA);)
594 return res;
595 }
597 void* operator new(size_t size) {
598 address res = (address)resource_allocate_bytes(size);
599 DEBUG_ONLY(set_allocation_type(res, RESOURCE_AREA);)
600 return res;
601 }
603 void* operator new(size_t size, const std::nothrow_t& nothrow_constant) {
604 address res = (address)resource_allocate_bytes(size, AllocFailStrategy::RETURN_NULL);
605 DEBUG_ONLY(if (res != NULL) set_allocation_type(res, RESOURCE_AREA);)
606 return res;
607 }
609 void* operator new [](size_t size) {
610 address res = (address)resource_allocate_bytes(size);
611 DEBUG_ONLY(set_allocation_type(res, RESOURCE_AREA);)
612 return res;
613 }
615 void* operator new [](size_t size, const std::nothrow_t& nothrow_constant) {
616 address res = (address)resource_allocate_bytes(size, AllocFailStrategy::RETURN_NULL);
617 DEBUG_ONLY(if (res != NULL) set_allocation_type(res, RESOURCE_AREA);)
618 return res;
619 }
621 void operator delete(void* p);
622 void operator delete [](void* p);
623 };
625 // One of the following macros must be used when allocating an array
626 // or object to determine whether it should reside in the C heap on in
627 // the resource area.
629 #define NEW_RESOURCE_ARRAY(type, size)\
630 (type*) resource_allocate_bytes((size) * sizeof(type))
632 #define NEW_RESOURCE_ARRAY_RETURN_NULL(type, size)\
633 (type*) resource_allocate_bytes((size) * sizeof(type), AllocFailStrategy::RETURN_NULL)
635 #define NEW_RESOURCE_ARRAY_IN_THREAD(thread, type, size)\
636 (type*) resource_allocate_bytes(thread, (size) * sizeof(type))
638 #define REALLOC_RESOURCE_ARRAY(type, old, old_size, new_size)\
639 (type*) resource_reallocate_bytes((char*)(old), (old_size) * sizeof(type), (new_size) * sizeof(type) )
641 #define FREE_RESOURCE_ARRAY(type, old, size)\
642 resource_free_bytes((char*)(old), (size) * sizeof(type))
644 #define FREE_FAST(old)\
645 /* nop */
647 #define NEW_RESOURCE_OBJ(type)\
648 NEW_RESOURCE_ARRAY(type, 1)
650 #define NEW_C_HEAP_ARRAY(type, size, memflags)\
651 (type*) (AllocateHeap((size) * sizeof(type), memflags))
653 #define REALLOC_C_HEAP_ARRAY(type, old, size, memflags)\
654 (type*) (ReallocateHeap((char*)old, (size) * sizeof(type), memflags))
656 #define FREE_C_HEAP_ARRAY(type, old, memflags) \
657 FreeHeap((char*)(old), memflags)
659 #define NEW_C_HEAP_ARRAY2(type, size, memflags, pc)\
660 (type*) (AllocateHeap((size) * sizeof(type), memflags, pc))
662 #define REALLOC_C_HEAP_ARRAY2(type, old, size, memflags, pc)\
663 (type*) (ReallocateHeap((char*)old, (size) * sizeof(type), memflags, pc))
665 #define NEW_C_HEAP_ARRAY3(type, size, memflags, pc, allocfail) \
666 (type*) AllocateHeap(size * sizeof(type), memflags, pc, allocfail)
668 // allocate type in heap without calling ctor
669 #define NEW_C_HEAP_OBJ(type, memflags)\
670 NEW_C_HEAP_ARRAY(type, 1, memflags)
672 // deallocate obj of type in heap without calling dtor
673 #define FREE_C_HEAP_OBJ(objname, memflags)\
674 FreeHeap((char*)objname, memflags);
676 // for statistics
677 #ifndef PRODUCT
678 class AllocStats : StackObj {
679 julong start_mallocs, start_frees;
680 julong start_malloc_bytes, start_mfree_bytes, start_res_bytes;
681 public:
682 AllocStats();
684 julong num_mallocs(); // since creation of receiver
685 julong alloc_bytes();
686 julong num_frees();
687 julong free_bytes();
688 julong resource_bytes();
689 void print();
690 };
691 #endif
694 //------------------------------ReallocMark---------------------------------
695 // Code which uses REALLOC_RESOURCE_ARRAY should check an associated
696 // ReallocMark, which is declared in the same scope as the reallocated
697 // pointer. Any operation that could __potentially__ cause a reallocation
698 // should check the ReallocMark.
699 class ReallocMark: public StackObj {
700 protected:
701 NOT_PRODUCT(int _nesting;)
703 public:
704 ReallocMark() PRODUCT_RETURN;
705 void check() PRODUCT_RETURN;
706 };
708 // Helper class to allocate arrays that may become large.
709 // Uses the OS malloc for allocations smaller than ArrayAllocatorMallocLimit
710 // and uses mapped memory for larger allocations.
711 // Most OS mallocs do something similar but Solaris malloc does not revert
712 // to mapped memory for large allocations. By default ArrayAllocatorMallocLimit
713 // is set so that we always use malloc except for Solaris where we set the
714 // limit to get mapped memory.
715 template <class E, MEMFLAGS F>
716 class ArrayAllocator : StackObj {
717 char* _addr;
718 bool _use_malloc;
719 size_t _size;
720 public:
721 ArrayAllocator() : _addr(NULL), _use_malloc(false), _size(0) { }
722 ~ArrayAllocator() { free(); }
723 E* allocate(size_t length);
724 void free();
725 };
727 #endif // SHARE_VM_MEMORY_ALLOCATION_HPP