Mon, 08 Jul 2013 10:58:48 -0700
8016903: Thread::_handle_area initial size too big
Summary: Changed initial size to Chunk::tiny_size (216 bytes)
Reviewed-by: coleenp, dholmes, sspitsyn
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 #include "precompiled.hpp"
26 #include "memory/allocation.hpp"
27 #include "memory/allocation.inline.hpp"
28 #include "memory/genCollectedHeap.hpp"
29 #include "memory/metaspaceShared.hpp"
30 #include "memory/resourceArea.hpp"
31 #include "memory/universe.hpp"
32 #include "runtime/atomic.hpp"
33 #include "runtime/os.hpp"
34 #include "runtime/task.hpp"
35 #include "runtime/threadCritical.hpp"
36 #include "services/memTracker.hpp"
37 #include "utilities/ostream.hpp"
39 #ifdef TARGET_OS_FAMILY_linux
40 # include "os_linux.inline.hpp"
41 #endif
42 #ifdef TARGET_OS_FAMILY_solaris
43 # include "os_solaris.inline.hpp"
44 #endif
45 #ifdef TARGET_OS_FAMILY_windows
46 # include "os_windows.inline.hpp"
47 #endif
48 #ifdef TARGET_OS_FAMILY_bsd
49 # include "os_bsd.inline.hpp"
50 #endif
52 void* StackObj::operator new(size_t size) { ShouldNotCallThis(); return 0; }
53 void StackObj::operator delete(void* p) { ShouldNotCallThis(); }
54 void* StackObj::operator new [](size_t size) { ShouldNotCallThis(); return 0; }
55 void StackObj::operator delete [](void* p) { ShouldNotCallThis(); }
57 void* _ValueObj::operator new(size_t size) { ShouldNotCallThis(); return 0; }
58 void _ValueObj::operator delete(void* p) { ShouldNotCallThis(); }
59 void* _ValueObj::operator new [](size_t size) { ShouldNotCallThis(); return 0; }
60 void _ValueObj::operator delete [](void* p) { ShouldNotCallThis(); }
62 void* MetaspaceObj::operator new(size_t size, ClassLoaderData* loader_data,
63 size_t word_size, bool read_only,
64 MetaspaceObj::Type type, TRAPS) {
65 // Klass has it's own operator new
66 return Metaspace::allocate(loader_data, word_size, read_only,
67 type, CHECK_NULL);
68 }
70 bool MetaspaceObj::is_shared() const {
71 return MetaspaceShared::is_in_shared_space(this);
72 }
75 bool MetaspaceObj::is_metaspace_object() const {
76 return Metaspace::contains((void*)this);
77 }
79 void MetaspaceObj::print_address_on(outputStream* st) const {
80 st->print(" {"INTPTR_FORMAT"}", this);
81 }
83 void* ResourceObj::operator new(size_t size, allocation_type type, MEMFLAGS flags) {
84 address res;
85 switch (type) {
86 case C_HEAP:
87 res = (address)AllocateHeap(size, flags, CALLER_PC);
88 DEBUG_ONLY(set_allocation_type(res, C_HEAP);)
89 break;
90 case RESOURCE_AREA:
91 // new(size) sets allocation type RESOURCE_AREA.
92 res = (address)operator new(size);
93 break;
94 default:
95 ShouldNotReachHere();
96 }
97 return res;
98 }
100 void* ResourceObj::operator new [](size_t size, allocation_type type, MEMFLAGS flags) {
101 return (address) operator new(size, type, flags);
102 }
104 void* ResourceObj::operator new(size_t size, const std::nothrow_t& nothrow_constant,
105 allocation_type type, MEMFLAGS flags) {
106 //should only call this with std::nothrow, use other operator new() otherwise
107 address res;
108 switch (type) {
109 case C_HEAP:
110 res = (address)AllocateHeap(size, flags, CALLER_PC, AllocFailStrategy::RETURN_NULL);
111 DEBUG_ONLY(if (res!= NULL) set_allocation_type(res, C_HEAP);)
112 break;
113 case RESOURCE_AREA:
114 // new(size) sets allocation type RESOURCE_AREA.
115 res = (address)operator new(size, std::nothrow);
116 break;
117 default:
118 ShouldNotReachHere();
119 }
120 return res;
121 }
123 void* ResourceObj::operator new [](size_t size, const std::nothrow_t& nothrow_constant,
124 allocation_type type, MEMFLAGS flags) {
125 return (address)operator new(size, nothrow_constant, type, flags);
126 }
128 void ResourceObj::operator delete(void* p) {
129 assert(((ResourceObj *)p)->allocated_on_C_heap(),
130 "delete only allowed for C_HEAP objects");
131 DEBUG_ONLY(((ResourceObj *)p)->_allocation_t[0] = (uintptr_t)badHeapOopVal;)
132 FreeHeap(p);
133 }
135 void ResourceObj::operator delete [](void* p) {
136 operator delete(p);
137 }
139 #ifdef ASSERT
140 void ResourceObj::set_allocation_type(address res, allocation_type type) {
141 // Set allocation type in the resource object
142 uintptr_t allocation = (uintptr_t)res;
143 assert((allocation & allocation_mask) == 0, "address should be aligned to 4 bytes at least");
144 assert(type <= allocation_mask, "incorrect allocation type");
145 ResourceObj* resobj = (ResourceObj *)res;
146 resobj->_allocation_t[0] = ~(allocation + type);
147 if (type != STACK_OR_EMBEDDED) {
148 // Called from operator new() and CollectionSetChooser(),
149 // set verification value.
150 resobj->_allocation_t[1] = (uintptr_t)&(resobj->_allocation_t[1]) + type;
151 }
152 }
154 ResourceObj::allocation_type ResourceObj::get_allocation_type() const {
155 assert(~(_allocation_t[0] | allocation_mask) == (uintptr_t)this, "lost resource object");
156 return (allocation_type)((~_allocation_t[0]) & allocation_mask);
157 }
159 bool ResourceObj::is_type_set() const {
160 allocation_type type = (allocation_type)(_allocation_t[1] & allocation_mask);
161 return get_allocation_type() == type &&
162 (_allocation_t[1] - type) == (uintptr_t)(&_allocation_t[1]);
163 }
165 ResourceObj::ResourceObj() { // default constructor
166 if (~(_allocation_t[0] | allocation_mask) != (uintptr_t)this) {
167 // Operator new() is not called for allocations
168 // on stack and for embedded objects.
169 set_allocation_type((address)this, STACK_OR_EMBEDDED);
170 } else if (allocated_on_stack()) { // STACK_OR_EMBEDDED
171 // For some reason we got a value which resembles
172 // an embedded or stack object (operator new() does not
173 // set such type). Keep it since it is valid value
174 // (even if it was garbage).
175 // Ignore garbage in other fields.
176 } else if (is_type_set()) {
177 // Operator new() was called and type was set.
178 assert(!allocated_on_stack(),
179 err_msg("not embedded or stack, this(" PTR_FORMAT ") type %d a[0]=(" PTR_FORMAT ") a[1]=(" PTR_FORMAT ")",
180 this, get_allocation_type(), _allocation_t[0], _allocation_t[1]));
181 } else {
182 // Operator new() was not called.
183 // Assume that it is embedded or stack object.
184 set_allocation_type((address)this, STACK_OR_EMBEDDED);
185 }
186 _allocation_t[1] = 0; // Zap verification value
187 }
189 ResourceObj::ResourceObj(const ResourceObj& r) { // default copy constructor
190 // Used in ClassFileParser::parse_constant_pool_entries() for ClassFileStream.
191 // Note: garbage may resembles valid value.
192 assert(~(_allocation_t[0] | allocation_mask) != (uintptr_t)this || !is_type_set(),
193 err_msg("embedded or stack only, this(" PTR_FORMAT ") type %d a[0]=(" PTR_FORMAT ") a[1]=(" PTR_FORMAT ")",
194 this, get_allocation_type(), _allocation_t[0], _allocation_t[1]));
195 set_allocation_type((address)this, STACK_OR_EMBEDDED);
196 _allocation_t[1] = 0; // Zap verification value
197 }
199 ResourceObj& ResourceObj::operator=(const ResourceObj& r) { // default copy assignment
200 // Used in InlineTree::ok_to_inline() for WarmCallInfo.
201 assert(allocated_on_stack(),
202 err_msg("copy only into local, this(" PTR_FORMAT ") type %d a[0]=(" PTR_FORMAT ") a[1]=(" PTR_FORMAT ")",
203 this, get_allocation_type(), _allocation_t[0], _allocation_t[1]));
204 // Keep current _allocation_t value;
205 return *this;
206 }
208 ResourceObj::~ResourceObj() {
209 // allocated_on_C_heap() also checks that encoded (in _allocation) address == this.
210 if (!allocated_on_C_heap()) { // ResourceObj::delete() will zap _allocation for C_heap.
211 _allocation_t[0] = (uintptr_t)badHeapOopVal; // zap type
212 }
213 }
214 #endif // ASSERT
217 void trace_heap_malloc(size_t size, const char* name, void* p) {
218 // A lock is not needed here - tty uses a lock internally
219 tty->print_cr("Heap malloc " INTPTR_FORMAT " " SIZE_FORMAT " %s", p, size, name == NULL ? "" : name);
220 }
223 void trace_heap_free(void* p) {
224 // A lock is not needed here - tty uses a lock internally
225 tty->print_cr("Heap free " INTPTR_FORMAT, p);
226 }
228 //--------------------------------------------------------------------------------------
229 // ChunkPool implementation
231 // MT-safe pool of chunks to reduce malloc/free thrashing
232 // NB: not using Mutex because pools are used before Threads are initialized
233 class ChunkPool: public CHeapObj<mtInternal> {
234 Chunk* _first; // first cached Chunk; its first word points to next chunk
235 size_t _num_chunks; // number of unused chunks in pool
236 size_t _num_used; // number of chunks currently checked out
237 const size_t _size; // size of each chunk (must be uniform)
239 // Our four static pools
240 static ChunkPool* _large_pool;
241 static ChunkPool* _medium_pool;
242 static ChunkPool* _small_pool;
243 static ChunkPool* _tiny_pool;
245 // return first element or null
246 void* get_first() {
247 Chunk* c = _first;
248 if (_first) {
249 _first = _first->next();
250 _num_chunks--;
251 }
252 return c;
253 }
255 public:
256 // All chunks in a ChunkPool has the same size
257 ChunkPool(size_t size) : _size(size) { _first = NULL; _num_chunks = _num_used = 0; }
259 // Allocate a new chunk from the pool (might expand the pool)
260 _NOINLINE_ void* allocate(size_t bytes, AllocFailType alloc_failmode) {
261 assert(bytes == _size, "bad size");
262 void* p = NULL;
263 // No VM lock can be taken inside ThreadCritical lock, so os::malloc
264 // should be done outside ThreadCritical lock due to NMT
265 { ThreadCritical tc;
266 _num_used++;
267 p = get_first();
268 }
269 if (p == NULL) p = os::malloc(bytes, mtChunk, CURRENT_PC);
270 if (p == NULL && alloc_failmode == AllocFailStrategy::EXIT_OOM) {
271 vm_exit_out_of_memory(bytes, OOM_MALLOC_ERROR, "ChunkPool::allocate");
272 }
273 return p;
274 }
276 // Return a chunk to the pool
277 void free(Chunk* chunk) {
278 assert(chunk->length() + Chunk::aligned_overhead_size() == _size, "bad size");
279 ThreadCritical tc;
280 _num_used--;
282 // Add chunk to list
283 chunk->set_next(_first);
284 _first = chunk;
285 _num_chunks++;
286 }
288 // Prune the pool
289 void free_all_but(size_t n) {
290 Chunk* cur = NULL;
291 Chunk* next;
292 {
293 // if we have more than n chunks, free all of them
294 ThreadCritical tc;
295 if (_num_chunks > n) {
296 // free chunks at end of queue, for better locality
297 cur = _first;
298 for (size_t i = 0; i < (n - 1) && cur != NULL; i++) cur = cur->next();
300 if (cur != NULL) {
301 next = cur->next();
302 cur->set_next(NULL);
303 cur = next;
305 _num_chunks = n;
306 }
307 }
308 }
310 // Free all remaining chunks, outside of ThreadCritical
311 // to avoid deadlock with NMT
312 while(cur != NULL) {
313 next = cur->next();
314 os::free(cur, mtChunk);
315 cur = next;
316 }
317 }
319 // Accessors to preallocated pool's
320 static ChunkPool* large_pool() { assert(_large_pool != NULL, "must be initialized"); return _large_pool; }
321 static ChunkPool* medium_pool() { assert(_medium_pool != NULL, "must be initialized"); return _medium_pool; }
322 static ChunkPool* small_pool() { assert(_small_pool != NULL, "must be initialized"); return _small_pool; }
323 static ChunkPool* tiny_pool() { assert(_tiny_pool != NULL, "must be initialized"); return _tiny_pool; }
325 static void initialize() {
326 _large_pool = new ChunkPool(Chunk::size + Chunk::aligned_overhead_size());
327 _medium_pool = new ChunkPool(Chunk::medium_size + Chunk::aligned_overhead_size());
328 _small_pool = new ChunkPool(Chunk::init_size + Chunk::aligned_overhead_size());
329 _tiny_pool = new ChunkPool(Chunk::tiny_size + Chunk::aligned_overhead_size());
330 }
332 static void clean() {
333 enum { BlocksToKeep = 5 };
334 _tiny_pool->free_all_but(BlocksToKeep);
335 _small_pool->free_all_but(BlocksToKeep);
336 _medium_pool->free_all_but(BlocksToKeep);
337 _large_pool->free_all_but(BlocksToKeep);
338 }
339 };
341 ChunkPool* ChunkPool::_large_pool = NULL;
342 ChunkPool* ChunkPool::_medium_pool = NULL;
343 ChunkPool* ChunkPool::_small_pool = NULL;
344 ChunkPool* ChunkPool::_tiny_pool = NULL;
346 void chunkpool_init() {
347 ChunkPool::initialize();
348 }
350 void
351 Chunk::clean_chunk_pool() {
352 ChunkPool::clean();
353 }
356 //--------------------------------------------------------------------------------------
357 // ChunkPoolCleaner implementation
358 //
360 class ChunkPoolCleaner : public PeriodicTask {
361 enum { CleaningInterval = 5000 }; // cleaning interval in ms
363 public:
364 ChunkPoolCleaner() : PeriodicTask(CleaningInterval) {}
365 void task() {
366 ChunkPool::clean();
367 }
368 };
370 //--------------------------------------------------------------------------------------
371 // Chunk implementation
373 void* Chunk::operator new (size_t requested_size, AllocFailType alloc_failmode, size_t length) {
374 // requested_size is equal to sizeof(Chunk) but in order for the arena
375 // allocations to come out aligned as expected the size must be aligned
376 // to expected arena alignment.
377 // expect requested_size but if sizeof(Chunk) doesn't match isn't proper size we must align it.
378 assert(ARENA_ALIGN(requested_size) == aligned_overhead_size(), "Bad alignment");
379 size_t bytes = ARENA_ALIGN(requested_size) + length;
380 switch (length) {
381 case Chunk::size: return ChunkPool::large_pool()->allocate(bytes, alloc_failmode);
382 case Chunk::medium_size: return ChunkPool::medium_pool()->allocate(bytes, alloc_failmode);
383 case Chunk::init_size: return ChunkPool::small_pool()->allocate(bytes, alloc_failmode);
384 case Chunk::tiny_size: return ChunkPool::tiny_pool()->allocate(bytes, alloc_failmode);
385 default: {
386 void* p = os::malloc(bytes, mtChunk, CALLER_PC);
387 if (p == NULL && alloc_failmode == AllocFailStrategy::EXIT_OOM) {
388 vm_exit_out_of_memory(bytes, OOM_MALLOC_ERROR, "Chunk::new");
389 }
390 return p;
391 }
392 }
393 }
395 void Chunk::operator delete(void* p) {
396 Chunk* c = (Chunk*)p;
397 switch (c->length()) {
398 case Chunk::size: ChunkPool::large_pool()->free(c); break;
399 case Chunk::medium_size: ChunkPool::medium_pool()->free(c); break;
400 case Chunk::init_size: ChunkPool::small_pool()->free(c); break;
401 case Chunk::tiny_size: ChunkPool::tiny_pool()->free(c); break;
402 default: os::free(c, mtChunk);
403 }
404 }
406 Chunk::Chunk(size_t length) : _len(length) {
407 _next = NULL; // Chain on the linked list
408 }
411 void Chunk::chop() {
412 Chunk *k = this;
413 while( k ) {
414 Chunk *tmp = k->next();
415 // clear out this chunk (to detect allocation bugs)
416 if (ZapResourceArea) memset(k->bottom(), badResourceValue, k->length());
417 delete k; // Free chunk (was malloc'd)
418 k = tmp;
419 }
420 }
422 void Chunk::next_chop() {
423 _next->chop();
424 _next = NULL;
425 }
428 void Chunk::start_chunk_pool_cleaner_task() {
429 #ifdef ASSERT
430 static bool task_created = false;
431 assert(!task_created, "should not start chuck pool cleaner twice");
432 task_created = true;
433 #endif
434 ChunkPoolCleaner* cleaner = new ChunkPoolCleaner();
435 cleaner->enroll();
436 }
438 //------------------------------Arena------------------------------------------
439 NOT_PRODUCT(volatile jint Arena::_instance_count = 0;)
441 Arena::Arena(size_t init_size) {
442 size_t round_size = (sizeof (char *)) - 1;
443 init_size = (init_size+round_size) & ~round_size;
444 _first = _chunk = new (AllocFailStrategy::EXIT_OOM, init_size) Chunk(init_size);
445 _hwm = _chunk->bottom(); // Save the cached hwm, max
446 _max = _chunk->top();
447 set_size_in_bytes(init_size);
448 NOT_PRODUCT(Atomic::inc(&_instance_count);)
449 }
451 Arena::Arena() {
452 _first = _chunk = new (AllocFailStrategy::EXIT_OOM, Chunk::init_size) Chunk(Chunk::init_size);
453 _hwm = _chunk->bottom(); // Save the cached hwm, max
454 _max = _chunk->top();
455 set_size_in_bytes(Chunk::init_size);
456 NOT_PRODUCT(Atomic::inc(&_instance_count);)
457 }
459 Arena *Arena::move_contents(Arena *copy) {
460 copy->destruct_contents();
461 copy->_chunk = _chunk;
462 copy->_hwm = _hwm;
463 copy->_max = _max;
464 copy->_first = _first;
466 // workaround rare racing condition, which could double count
467 // the arena size by native memory tracking
468 size_t size = size_in_bytes();
469 set_size_in_bytes(0);
470 copy->set_size_in_bytes(size);
471 // Destroy original arena
472 reset();
473 return copy; // Return Arena with contents
474 }
476 Arena::~Arena() {
477 destruct_contents();
478 NOT_PRODUCT(Atomic::dec(&_instance_count);)
479 }
481 void* Arena::operator new(size_t size) {
482 assert(false, "Use dynamic memory type binding");
483 return NULL;
484 }
486 void* Arena::operator new (size_t size, const std::nothrow_t& nothrow_constant) {
487 assert(false, "Use dynamic memory type binding");
488 return NULL;
489 }
491 // dynamic memory type binding
492 void* Arena::operator new(size_t size, MEMFLAGS flags) {
493 #ifdef ASSERT
494 void* p = (void*)AllocateHeap(size, flags|otArena, CALLER_PC);
495 if (PrintMallocFree) trace_heap_malloc(size, "Arena-new", p);
496 return p;
497 #else
498 return (void *) AllocateHeap(size, flags|otArena, CALLER_PC);
499 #endif
500 }
502 void* Arena::operator new(size_t size, const std::nothrow_t& nothrow_constant, MEMFLAGS flags) {
503 #ifdef ASSERT
504 void* p = os::malloc(size, flags|otArena, CALLER_PC);
505 if (PrintMallocFree) trace_heap_malloc(size, "Arena-new", p);
506 return p;
507 #else
508 return os::malloc(size, flags|otArena, CALLER_PC);
509 #endif
510 }
512 void Arena::operator delete(void* p) {
513 FreeHeap(p);
514 }
516 // Destroy this arenas contents and reset to empty
517 void Arena::destruct_contents() {
518 if (UseMallocOnly && _first != NULL) {
519 char* end = _first->next() ? _first->top() : _hwm;
520 free_malloced_objects(_first, _first->bottom(), end, _hwm);
521 }
522 // reset size before chop to avoid a rare racing condition
523 // that can have total arena memory exceed total chunk memory
524 set_size_in_bytes(0);
525 _first->chop();
526 reset();
527 }
529 // This is high traffic method, but many calls actually don't
530 // change the size
531 void Arena::set_size_in_bytes(size_t size) {
532 if (_size_in_bytes != size) {
533 _size_in_bytes = size;
534 MemTracker::record_arena_size((address)this, size);
535 }
536 }
538 // Total of all Chunks in arena
539 size_t Arena::used() const {
540 size_t sum = _chunk->length() - (_max-_hwm); // Size leftover in this Chunk
541 register Chunk *k = _first;
542 while( k != _chunk) { // Whilst have Chunks in a row
543 sum += k->length(); // Total size of this Chunk
544 k = k->next(); // Bump along to next Chunk
545 }
546 return sum; // Return total consumed space.
547 }
549 void Arena::signal_out_of_memory(size_t sz, const char* whence) const {
550 vm_exit_out_of_memory(sz, OOM_MALLOC_ERROR, whence);
551 }
553 // Grow a new Chunk
554 void* Arena::grow(size_t x, AllocFailType alloc_failmode) {
555 // Get minimal required size. Either real big, or even bigger for giant objs
556 size_t len = MAX2(x, (size_t) Chunk::size);
558 Chunk *k = _chunk; // Get filled-up chunk address
559 _chunk = new (alloc_failmode, len) Chunk(len);
561 if (_chunk == NULL) {
562 return NULL;
563 }
564 if (k) k->set_next(_chunk); // Append new chunk to end of linked list
565 else _first = _chunk;
566 _hwm = _chunk->bottom(); // Save the cached hwm, max
567 _max = _chunk->top();
568 set_size_in_bytes(size_in_bytes() + len);
569 void* result = _hwm;
570 _hwm += x;
571 return result;
572 }
576 // Reallocate storage in Arena.
577 void *Arena::Arealloc(void* old_ptr, size_t old_size, size_t new_size, AllocFailType alloc_failmode) {
578 assert(new_size >= 0, "bad size");
579 if (new_size == 0) return NULL;
580 #ifdef ASSERT
581 if (UseMallocOnly) {
582 // always allocate a new object (otherwise we'll free this one twice)
583 char* copy = (char*)Amalloc(new_size, alloc_failmode);
584 if (copy == NULL) {
585 return NULL;
586 }
587 size_t n = MIN2(old_size, new_size);
588 if (n > 0) memcpy(copy, old_ptr, n);
589 Afree(old_ptr,old_size); // Mostly done to keep stats accurate
590 return copy;
591 }
592 #endif
593 char *c_old = (char*)old_ptr; // Handy name
594 // Stupid fast special case
595 if( new_size <= old_size ) { // Shrink in-place
596 if( c_old+old_size == _hwm) // Attempt to free the excess bytes
597 _hwm = c_old+new_size; // Adjust hwm
598 return c_old;
599 }
601 // make sure that new_size is legal
602 size_t corrected_new_size = ARENA_ALIGN(new_size);
604 // See if we can resize in-place
605 if( (c_old+old_size == _hwm) && // Adjusting recent thing
606 (c_old+corrected_new_size <= _max) ) { // Still fits where it sits
607 _hwm = c_old+corrected_new_size; // Adjust hwm
608 return c_old; // Return old pointer
609 }
611 // Oops, got to relocate guts
612 void *new_ptr = Amalloc(new_size, alloc_failmode);
613 if (new_ptr == NULL) {
614 return NULL;
615 }
616 memcpy( new_ptr, c_old, old_size );
617 Afree(c_old,old_size); // Mostly done to keep stats accurate
618 return new_ptr;
619 }
622 // Determine if pointer belongs to this Arena or not.
623 bool Arena::contains( const void *ptr ) const {
624 #ifdef ASSERT
625 if (UseMallocOnly) {
626 // really slow, but not easy to make fast
627 if (_chunk == NULL) return false;
628 char** bottom = (char**)_chunk->bottom();
629 for (char** p = (char**)_hwm - 1; p >= bottom; p--) {
630 if (*p == ptr) return true;
631 }
632 for (Chunk *c = _first; c != NULL; c = c->next()) {
633 if (c == _chunk) continue; // current chunk has been processed
634 char** bottom = (char**)c->bottom();
635 for (char** p = (char**)c->top() - 1; p >= bottom; p--) {
636 if (*p == ptr) return true;
637 }
638 }
639 return false;
640 }
641 #endif
642 if( (void*)_chunk->bottom() <= ptr && ptr < (void*)_hwm )
643 return true; // Check for in this chunk
644 for (Chunk *c = _first; c; c = c->next()) {
645 if (c == _chunk) continue; // current chunk has been processed
646 if ((void*)c->bottom() <= ptr && ptr < (void*)c->top()) {
647 return true; // Check for every chunk in Arena
648 }
649 }
650 return false; // Not in any Chunk, so not in Arena
651 }
654 #ifdef ASSERT
655 void* Arena::malloc(size_t size) {
656 assert(UseMallocOnly, "shouldn't call");
657 // use malloc, but save pointer in res. area for later freeing
658 char** save = (char**)internal_malloc_4(sizeof(char*));
659 return (*save = (char*)os::malloc(size, mtChunk));
660 }
662 // for debugging with UseMallocOnly
663 void* Arena::internal_malloc_4(size_t x) {
664 assert( (x&(sizeof(char*)-1)) == 0, "misaligned size" );
665 check_for_overflow(x, "Arena::internal_malloc_4");
666 if (_hwm + x > _max) {
667 return grow(x);
668 } else {
669 char *old = _hwm;
670 _hwm += x;
671 return old;
672 }
673 }
674 #endif
677 //--------------------------------------------------------------------------------------
678 // Non-product code
680 #ifndef PRODUCT
681 // The global operator new should never be called since it will usually indicate
682 // a memory leak. Use CHeapObj as the base class of such objects to make it explicit
683 // that they're allocated on the C heap.
684 // Commented out in product version to avoid conflicts with third-party C++ native code.
685 // On certain platforms, such as Mac OS X (Darwin), in debug version, new is being called
686 // from jdk source and causing data corruption. Such as
687 // Java_sun_security_ec_ECKeyPairGenerator_generateECKeyPair
688 // define ALLOW_OPERATOR_NEW_USAGE for platform on which global operator new allowed.
689 //
690 #ifndef ALLOW_OPERATOR_NEW_USAGE
691 void* operator new(size_t size){
692 assert(false, "Should not call global operator new");
693 return 0;
694 }
696 void* operator new [](size_t size){
697 assert(false, "Should not call global operator new[]");
698 return 0;
699 }
701 void* operator new(size_t size, const std::nothrow_t& nothrow_constant){
702 assert(false, "Should not call global operator new");
703 return 0;
704 }
706 void* operator new [](size_t size, std::nothrow_t& nothrow_constant){
707 assert(false, "Should not call global operator new[]");
708 return 0;
709 }
711 void operator delete(void* p) {
712 assert(false, "Should not call global delete");
713 }
715 void operator delete [](void* p) {
716 assert(false, "Should not call global delete []");
717 }
718 #endif // ALLOW_OPERATOR_NEW_USAGE
720 void AllocatedObj::print() const { print_on(tty); }
721 void AllocatedObj::print_value() const { print_value_on(tty); }
723 void AllocatedObj::print_on(outputStream* st) const {
724 st->print_cr("AllocatedObj(" INTPTR_FORMAT ")", this);
725 }
727 void AllocatedObj::print_value_on(outputStream* st) const {
728 st->print("AllocatedObj(" INTPTR_FORMAT ")", this);
729 }
731 julong Arena::_bytes_allocated = 0;
733 void Arena::inc_bytes_allocated(size_t x) { inc_stat_counter(&_bytes_allocated, x); }
735 AllocStats::AllocStats() {
736 start_mallocs = os::num_mallocs;
737 start_frees = os::num_frees;
738 start_malloc_bytes = os::alloc_bytes;
739 start_mfree_bytes = os::free_bytes;
740 start_res_bytes = Arena::_bytes_allocated;
741 }
743 julong AllocStats::num_mallocs() { return os::num_mallocs - start_mallocs; }
744 julong AllocStats::alloc_bytes() { return os::alloc_bytes - start_malloc_bytes; }
745 julong AllocStats::num_frees() { return os::num_frees - start_frees; }
746 julong AllocStats::free_bytes() { return os::free_bytes - start_mfree_bytes; }
747 julong AllocStats::resource_bytes() { return Arena::_bytes_allocated - start_res_bytes; }
748 void AllocStats::print() {
749 tty->print_cr(UINT64_FORMAT " mallocs (" UINT64_FORMAT "MB), "
750 UINT64_FORMAT" frees (" UINT64_FORMAT "MB), " UINT64_FORMAT "MB resrc",
751 num_mallocs(), alloc_bytes()/M, num_frees(), free_bytes()/M, resource_bytes()/M);
752 }
755 // debugging code
756 inline void Arena::free_all(char** start, char** end) {
757 for (char** p = start; p < end; p++) if (*p) os::free(*p);
758 }
760 void Arena::free_malloced_objects(Chunk* chunk, char* hwm, char* max, char* hwm2) {
761 assert(UseMallocOnly, "should not call");
762 // free all objects malloced since resource mark was created; resource area
763 // contains their addresses
764 if (chunk->next()) {
765 // this chunk is full, and some others too
766 for (Chunk* c = chunk->next(); c != NULL; c = c->next()) {
767 char* top = c->top();
768 if (c->next() == NULL) {
769 top = hwm2; // last junk is only used up to hwm2
770 assert(c->contains(hwm2), "bad hwm2");
771 }
772 free_all((char**)c->bottom(), (char**)top);
773 }
774 assert(chunk->contains(hwm), "bad hwm");
775 assert(chunk->contains(max), "bad max");
776 free_all((char**)hwm, (char**)max);
777 } else {
778 // this chunk was partially used
779 assert(chunk->contains(hwm), "bad hwm");
780 assert(chunk->contains(hwm2), "bad hwm2");
781 free_all((char**)hwm, (char**)hwm2);
782 }
783 }
786 ReallocMark::ReallocMark() {
787 #ifdef ASSERT
788 Thread *thread = ThreadLocalStorage::get_thread_slow();
789 _nesting = thread->resource_area()->nesting();
790 #endif
791 }
793 void ReallocMark::check() {
794 #ifdef ASSERT
795 if (_nesting != Thread::current()->resource_area()->nesting()) {
796 fatal("allocation bug: array could grow within nested ResourceMark");
797 }
798 #endif
799 }
801 #endif // Non-product