Mon, 26 Aug 2013 09:33:01 +0200
8022683: JNI GetStringUTFChars should return NULL on allocation failure not abort the VM
Summary: Return NULL on OOM from GetStringChars, GetStringUTFChars and Get<PrimitiveType>ArrayElements family of functions.
Reviewed-by: dholmes, coleenp
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_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 #define METASPACE_OBJ_TYPES_DO(f) \
272 f(Unknown) \
273 f(Class) \
274 f(Symbol) \
275 f(TypeArrayU1) \
276 f(TypeArrayU2) \
277 f(TypeArrayU4) \
278 f(TypeArrayU8) \
279 f(TypeArrayOther) \
280 f(Method) \
281 f(ConstMethod) \
282 f(MethodData) \
283 f(ConstantPool) \
284 f(ConstantPoolCache) \
285 f(Annotation) \
286 f(MethodCounters)
288 #define METASPACE_OBJ_TYPE_DECLARE(name) name ## Type,
289 #define METASPACE_OBJ_TYPE_NAME_CASE(name) case name ## Type: return #name;
291 enum Type {
292 // Types are MetaspaceObj::ClassType, MetaspaceObj::SymbolType, etc
293 METASPACE_OBJ_TYPES_DO(METASPACE_OBJ_TYPE_DECLARE)
294 _number_of_types
295 };
297 static const char * type_name(Type type) {
298 switch(type) {
299 METASPACE_OBJ_TYPES_DO(METASPACE_OBJ_TYPE_NAME_CASE)
300 default:
301 ShouldNotReachHere();
302 return NULL;
303 }
304 }
306 static MetaspaceObj::Type array_type(size_t elem_size) {
307 switch (elem_size) {
308 case 1: return TypeArrayU1Type;
309 case 2: return TypeArrayU2Type;
310 case 4: return TypeArrayU4Type;
311 case 8: return TypeArrayU8Type;
312 default:
313 return TypeArrayOtherType;
314 }
315 }
317 void* operator new(size_t size, ClassLoaderData* loader_data,
318 size_t word_size, bool read_only,
319 Type type, Thread* thread);
320 // can't use TRAPS from this header file.
321 void operator delete(void* p) { ShouldNotCallThis(); }
322 };
324 // Base class for classes that constitute name spaces.
326 class AllStatic {
327 public:
328 AllStatic() { ShouldNotCallThis(); }
329 ~AllStatic() { ShouldNotCallThis(); }
330 };
333 //------------------------------Chunk------------------------------------------
334 // Linked list of raw memory chunks
335 class Chunk: CHeapObj<mtChunk> {
336 friend class VMStructs;
338 protected:
339 Chunk* _next; // Next Chunk in list
340 const size_t _len; // Size of this Chunk
341 public:
342 void* operator new(size_t size, AllocFailType alloc_failmode, size_t length);
343 void operator delete(void* p);
344 Chunk(size_t length);
346 enum {
347 // default sizes; make them slightly smaller than 2**k to guard against
348 // buddy-system style malloc implementations
349 #ifdef _LP64
350 slack = 40, // [RGV] Not sure if this is right, but make it
351 // a multiple of 8.
352 #else
353 slack = 20, // suspected sizeof(Chunk) + internal malloc headers
354 #endif
356 tiny_size = 256 - slack, // Size of first chunk (tiny)
357 init_size = 1*K - slack, // Size of first chunk (normal aka small)
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 bool check_for_overflow(size_t request, const char* whence,
407 AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM) const {
408 if (UINTPTR_MAX - request < (uintptr_t)_hwm) {
409 if (alloc_failmode == AllocFailStrategy::RETURN_NULL) {
410 return false;
411 }
412 signal_out_of_memory(request, whence);
413 }
414 return true;
415 }
417 public:
418 Arena();
419 Arena(size_t init_size);
420 ~Arena();
421 void destruct_contents();
422 char* hwm() const { return _hwm; }
424 // new operators
425 void* operator new (size_t size);
426 void* operator new (size_t size, const std::nothrow_t& nothrow_constant);
428 // dynamic memory type tagging
429 void* operator new(size_t size, MEMFLAGS flags);
430 void* operator new(size_t size, const std::nothrow_t& nothrow_constant, MEMFLAGS flags);
431 void operator delete(void* p);
433 // Fast allocate in the arena. Common case is: pointer test + increment.
434 void* Amalloc(size_t x, AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM) {
435 assert(is_power_of_2(ARENA_AMALLOC_ALIGNMENT) , "should be a power of 2");
436 x = ARENA_ALIGN(x);
437 debug_only(if (UseMallocOnly) return malloc(x);)
438 if (!check_for_overflow(x, "Arena::Amalloc", alloc_failmode))
439 return NULL;
440 NOT_PRODUCT(inc_bytes_allocated(x);)
441 if (_hwm + x > _max) {
442 return grow(x, alloc_failmode);
443 } else {
444 char *old = _hwm;
445 _hwm += x;
446 return old;
447 }
448 }
449 // Further assume size is padded out to words
450 void *Amalloc_4(size_t x, AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM) {
451 assert( (x&(sizeof(char*)-1)) == 0, "misaligned size" );
452 debug_only(if (UseMallocOnly) return malloc(x);)
453 if (!check_for_overflow(x, "Arena::Amalloc_4", alloc_failmode))
454 return NULL;
455 NOT_PRODUCT(inc_bytes_allocated(x);)
456 if (_hwm + x > _max) {
457 return grow(x, alloc_failmode);
458 } else {
459 char *old = _hwm;
460 _hwm += x;
461 return old;
462 }
463 }
465 // Allocate with 'double' alignment. It is 8 bytes on sparc.
466 // In other cases Amalloc_D() should be the same as Amalloc_4().
467 void* Amalloc_D(size_t x, AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM) {
468 assert( (x&(sizeof(char*)-1)) == 0, "misaligned size" );
469 debug_only(if (UseMallocOnly) return malloc(x);)
470 #if defined(SPARC) && !defined(_LP64)
471 #define DALIGN_M1 7
472 size_t delta = (((size_t)_hwm + DALIGN_M1) & ~DALIGN_M1) - (size_t)_hwm;
473 x += delta;
474 #endif
475 if (!check_for_overflow(x, "Arena::Amalloc_D", alloc_failmode))
476 return NULL;
477 NOT_PRODUCT(inc_bytes_allocated(x);)
478 if (_hwm + x > _max) {
479 return grow(x, alloc_failmode); // grow() returns a result aligned >= 8 bytes.
480 } else {
481 char *old = _hwm;
482 _hwm += x;
483 #if defined(SPARC) && !defined(_LP64)
484 old += delta; // align to 8-bytes
485 #endif
486 return old;
487 }
488 }
490 // Fast delete in area. Common case is: NOP (except for storage reclaimed)
491 void Afree(void *ptr, size_t size) {
492 #ifdef ASSERT
493 if (ZapResourceArea) memset(ptr, badResourceValue, size); // zap freed memory
494 if (UseMallocOnly) return;
495 #endif
496 if (((char*)ptr) + size == _hwm) _hwm = (char*)ptr;
497 }
499 void *Arealloc( void *old_ptr, size_t old_size, size_t new_size,
500 AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM);
502 // Move contents of this arena into an empty arena
503 Arena *move_contents(Arena *empty_arena);
505 // Determine if pointer belongs to this Arena or not.
506 bool contains( const void *ptr ) const;
508 // Total of all chunks in use (not thread-safe)
509 size_t used() const;
511 // Total # of bytes used
512 size_t size_in_bytes() const { return _size_in_bytes; };
513 void set_size_in_bytes(size_t size);
515 static void free_malloced_objects(Chunk* chunk, char* hwm, char* max, char* hwm2) PRODUCT_RETURN;
516 static void free_all(char** start, char** end) PRODUCT_RETURN;
518 // how many arena instances
519 NOT_PRODUCT(static volatile jint _instance_count;)
520 private:
521 // Reset this Arena to empty, access will trigger grow if necessary
522 void reset(void) {
523 _first = _chunk = NULL;
524 _hwm = _max = NULL;
525 set_size_in_bytes(0);
526 }
527 };
529 // One of the following macros must be used when allocating
530 // an array or object from an arena
531 #define NEW_ARENA_ARRAY(arena, type, size) \
532 (type*) (arena)->Amalloc((size) * sizeof(type))
534 #define REALLOC_ARENA_ARRAY(arena, type, old, old_size, new_size) \
535 (type*) (arena)->Arealloc((char*)(old), (old_size) * sizeof(type), \
536 (new_size) * sizeof(type) )
538 #define FREE_ARENA_ARRAY(arena, type, old, size) \
539 (arena)->Afree((char*)(old), (size) * sizeof(type))
541 #define NEW_ARENA_OBJ(arena, type) \
542 NEW_ARENA_ARRAY(arena, type, 1)
545 //%note allocation_1
546 extern char* resource_allocate_bytes(size_t size,
547 AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM);
548 extern char* resource_allocate_bytes(Thread* thread, size_t size,
549 AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM);
550 extern char* resource_reallocate_bytes( char *old, size_t old_size, size_t new_size,
551 AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM);
552 extern void resource_free_bytes( char *old, size_t size );
554 //----------------------------------------------------------------------
555 // Base class for objects allocated in the resource area per default.
556 // Optionally, objects may be allocated on the C heap with
557 // new(ResourceObj::C_HEAP) Foo(...) or in an Arena with new (&arena)
558 // ResourceObj's can be allocated within other objects, but don't use
559 // new or delete (allocation_type is unknown). If new is used to allocate,
560 // use delete to deallocate.
561 class ResourceObj ALLOCATION_SUPER_CLASS_SPEC {
562 public:
563 enum allocation_type { STACK_OR_EMBEDDED = 0, RESOURCE_AREA, C_HEAP, ARENA, allocation_mask = 0x3 };
564 static void set_allocation_type(address res, allocation_type type) NOT_DEBUG_RETURN;
565 #ifdef ASSERT
566 private:
567 // When this object is allocated on stack the new() operator is not
568 // called but garbage on stack may look like a valid allocation_type.
569 // Store negated 'this' pointer when new() is called to distinguish cases.
570 // Use second array's element for verification value to distinguish garbage.
571 uintptr_t _allocation_t[2];
572 bool is_type_set() const;
573 public:
574 allocation_type get_allocation_type() const;
575 bool allocated_on_stack() const { return get_allocation_type() == STACK_OR_EMBEDDED; }
576 bool allocated_on_res_area() const { return get_allocation_type() == RESOURCE_AREA; }
577 bool allocated_on_C_heap() const { return get_allocation_type() == C_HEAP; }
578 bool allocated_on_arena() const { return get_allocation_type() == ARENA; }
579 ResourceObj(); // default construtor
580 ResourceObj(const ResourceObj& r); // default copy construtor
581 ResourceObj& operator=(const ResourceObj& r); // default copy assignment
582 ~ResourceObj();
583 #endif // ASSERT
585 public:
586 void* operator new(size_t size, allocation_type type, MEMFLAGS flags);
587 void* operator new [](size_t size, allocation_type type, MEMFLAGS flags);
588 void* operator new(size_t size, const std::nothrow_t& nothrow_constant,
589 allocation_type type, MEMFLAGS flags);
590 void* operator new [](size_t size, const std::nothrow_t& nothrow_constant,
591 allocation_type type, MEMFLAGS flags);
593 void* operator new(size_t size, Arena *arena) {
594 address res = (address)arena->Amalloc(size);
595 DEBUG_ONLY(set_allocation_type(res, ARENA);)
596 return res;
597 }
599 void* operator new [](size_t size, Arena *arena) {
600 address res = (address)arena->Amalloc(size);
601 DEBUG_ONLY(set_allocation_type(res, ARENA);)
602 return res;
603 }
605 void* operator new(size_t size) {
606 address res = (address)resource_allocate_bytes(size);
607 DEBUG_ONLY(set_allocation_type(res, RESOURCE_AREA);)
608 return res;
609 }
611 void* operator new(size_t size, const std::nothrow_t& nothrow_constant) {
612 address res = (address)resource_allocate_bytes(size, AllocFailStrategy::RETURN_NULL);
613 DEBUG_ONLY(if (res != NULL) set_allocation_type(res, RESOURCE_AREA);)
614 return res;
615 }
617 void* operator new [](size_t size) {
618 address res = (address)resource_allocate_bytes(size);
619 DEBUG_ONLY(set_allocation_type(res, RESOURCE_AREA);)
620 return res;
621 }
623 void* operator new [](size_t size, const std::nothrow_t& nothrow_constant) {
624 address res = (address)resource_allocate_bytes(size, AllocFailStrategy::RETURN_NULL);
625 DEBUG_ONLY(if (res != NULL) set_allocation_type(res, RESOURCE_AREA);)
626 return res;
627 }
629 void operator delete(void* p);
630 void operator delete [](void* p);
631 };
633 // One of the following macros must be used when allocating an array
634 // or object to determine whether it should reside in the C heap on in
635 // the resource area.
637 #define NEW_RESOURCE_ARRAY(type, size)\
638 (type*) resource_allocate_bytes((size) * sizeof(type))
640 #define NEW_RESOURCE_ARRAY_RETURN_NULL(type, size)\
641 (type*) resource_allocate_bytes((size) * sizeof(type), AllocFailStrategy::RETURN_NULL)
643 #define NEW_RESOURCE_ARRAY_IN_THREAD(thread, type, size)\
644 (type*) resource_allocate_bytes(thread, (size) * sizeof(type))
646 #define NEW_RESOURCE_ARRAY_IN_THREAD_RETURN_NULL(thread, type, size)\
647 (type*) resource_allocate_bytes(thread, (size) * sizeof(type), AllocFailStrategy::RETURN_NULL)
649 #define REALLOC_RESOURCE_ARRAY(type, old, old_size, new_size)\
650 (type*) resource_reallocate_bytes((char*)(old), (old_size) * sizeof(type), (new_size) * sizeof(type))
652 #define REALLOC_RESOURCE_ARRAY_RETURN_NULL(type, old, old_size, new_size)\
653 (type*) resource_reallocate_bytes((char*)(old), (old_size) * sizeof(type),\
654 (new_size) * sizeof(type), AllocFailStrategy::RETURN_NULL)
656 #define FREE_RESOURCE_ARRAY(type, old, size)\
657 resource_free_bytes((char*)(old), (size) * sizeof(type))
659 #define FREE_FAST(old)\
660 /* nop */
662 #define NEW_RESOURCE_OBJ(type)\
663 NEW_RESOURCE_ARRAY(type, 1)
665 #define NEW_RESOURCE_OBJ_RETURN_NULL(type)\
666 NEW_RESOURCE_ARRAY_RETURN_NULL(type, 1)
668 #define NEW_C_HEAP_ARRAY3(type, size, memflags, pc, allocfail)\
669 (type*) AllocateHeap((size) * sizeof(type), memflags, pc, allocfail)
671 #define NEW_C_HEAP_ARRAY2(type, size, memflags, pc)\
672 (type*) (AllocateHeap((size) * sizeof(type), memflags, pc))
674 #define NEW_C_HEAP_ARRAY(type, size, memflags)\
675 (type*) (AllocateHeap((size) * sizeof(type), memflags))
677 #define NEW_C_HEAP_ARRAY2_RETURN_NULL(type, size, memflags, pc)\
678 NEW_C_HEAP_ARRAY3(type, (size), memflags, pc, AllocFailStrategy::RETURN_NULL)
680 #define NEW_C_HEAP_ARRAY_RETURN_NULL(type, size, memflags)\
681 NEW_C_HEAP_ARRAY3(type, (size), memflags, (address)0, AllocFailStrategy::RETURN_NULL)
683 #define REALLOC_C_HEAP_ARRAY(type, old, size, memflags)\
684 (type*) (ReallocateHeap((char*)(old), (size) * sizeof(type), memflags))
686 #define REALLOC_C_HEAP_ARRAY_RETURN_NULL(type, old, size, memflags)\
687 (type*) (ReallocateHeap((char*)(old), (size) * sizeof(type), memflags, AllocFailStrategy::RETURN_NULL))
689 #define FREE_C_HEAP_ARRAY(type, old, memflags) \
690 FreeHeap((char*)(old), memflags)
692 // allocate type in heap without calling ctor
693 #define NEW_C_HEAP_OBJ(type, memflags)\
694 NEW_C_HEAP_ARRAY(type, 1, memflags)
696 #define NEW_C_HEAP_OBJ_RETURN_NULL(type, memflags)\
697 NEW_C_HEAP_ARRAY_RETURN_NULL(type, 1, memflags)
699 // deallocate obj of type in heap without calling dtor
700 #define FREE_C_HEAP_OBJ(objname, memflags)\
701 FreeHeap((char*)objname, memflags);
703 // for statistics
704 #ifndef PRODUCT
705 class AllocStats : StackObj {
706 julong start_mallocs, start_frees;
707 julong start_malloc_bytes, start_mfree_bytes, start_res_bytes;
708 public:
709 AllocStats();
711 julong num_mallocs(); // since creation of receiver
712 julong alloc_bytes();
713 julong num_frees();
714 julong free_bytes();
715 julong resource_bytes();
716 void print();
717 };
718 #endif
721 //------------------------------ReallocMark---------------------------------
722 // Code which uses REALLOC_RESOURCE_ARRAY should check an associated
723 // ReallocMark, which is declared in the same scope as the reallocated
724 // pointer. Any operation that could __potentially__ cause a reallocation
725 // should check the ReallocMark.
726 class ReallocMark: public StackObj {
727 protected:
728 NOT_PRODUCT(int _nesting;)
730 public:
731 ReallocMark() PRODUCT_RETURN;
732 void check() PRODUCT_RETURN;
733 };
735 // Helper class to allocate arrays that may become large.
736 // Uses the OS malloc for allocations smaller than ArrayAllocatorMallocLimit
737 // and uses mapped memory for larger allocations.
738 // Most OS mallocs do something similar but Solaris malloc does not revert
739 // to mapped memory for large allocations. By default ArrayAllocatorMallocLimit
740 // is set so that we always use malloc except for Solaris where we set the
741 // limit to get mapped memory.
742 template <class E, MEMFLAGS F>
743 class ArrayAllocator VALUE_OBJ_CLASS_SPEC {
744 char* _addr;
745 bool _use_malloc;
746 size_t _size;
747 bool _free_in_destructor;
748 public:
749 ArrayAllocator(bool free_in_destructor = true) :
750 _addr(NULL), _use_malloc(false), _size(0), _free_in_destructor(free_in_destructor) { }
752 ~ArrayAllocator() {
753 if (_free_in_destructor) {
754 free();
755 }
756 }
758 E* allocate(size_t length);
759 void free();
760 };
762 #endif // SHARE_VM_MEMORY_ALLOCATION_HPP