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src/share/vm/runtime/handles.cpp@9f4457a14b58 (annotated)

src/share/vm/runtime/handles.cpp

Wed, 09 Apr 2008 15:10:22 -0700

author

rasbold

date

Wed, 09 Apr 2008 15:10:22 -0700

changeset 544

9f4457a14b58

parent 435

a61af66fc99e

child 1907

c18cbe5936b8

permissions

-rw-r--r--

Merge

duke@435	1	/*
duke@435	2	* Copyright 1997-2003 Sun Microsystems, Inc. All Rights Reserved.
duke@435	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435	4	*
duke@435	5	* This code is free software; you can redistribute it and/or modify it
duke@435	6	* under the terms of the GNU General Public License version 2 only, as
duke@435	7	* published by the Free Software Foundation.
duke@435	8	*
duke@435	9	* This code is distributed in the hope that it will be useful, but WITHOUT
duke@435	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
duke@435	12	* version 2 for more details (a copy is included in the LICENSE file that
duke@435	13	* accompanied this code).
duke@435	14	*
duke@435	15	* You should have received a copy of the GNU General Public License version
duke@435	16	* 2 along with this work; if not, write to the Free Software Foundation,
duke@435	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435	18	*
duke@435	19	* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
duke@435	20	* CA 95054 USA or visit www.sun.com if you need additional information or
duke@435	21	* have any questions.
duke@435	22	*
duke@435	23	*/
duke@435	24
duke@435	25	# include "incls/_precompiled.incl"
duke@435	26	# include "incls/_handles.cpp.incl"
duke@435	27
duke@435	28	#ifdef ASSERT
duke@435	29	oop* HandleArea::allocate_handle(oop obj) {
duke@435	30	assert(_handle_mark_nesting > 1, "memory leak: allocating handle outside HandleMark");
duke@435	31	assert(_no_handle_mark_nesting == 0, "allocating handle inside NoHandleMark");
duke@435	32	assert(SharedSkipVerify || obj->is_oop(), "sanity check");
duke@435	33	return real_allocate_handle(obj);
duke@435	34	}
duke@435	35
duke@435	36	Handle::Handle(Thread* thread, oop obj) {
duke@435	37	assert(thread == Thread::current(), "sanity check");
duke@435	38	if (obj == NULL) {
duke@435	39	_handle = NULL;
duke@435	40	} else {
duke@435	41	_handle = thread->handle_area()->allocate_handle(obj);
duke@435	42	}
duke@435	43	}
duke@435	44
duke@435	45	#endif
duke@435	46
duke@435	47	static uintx chunk_oops_do(OopClosure* f, Chunk* chunk, char* chunk_top) {
duke@435	48	oop* bottom = (oop*) chunk->bottom();
duke@435	49	oop* top = (oop*) chunk_top;
duke@435	50	uintx handles_visited = top - bottom;
duke@435	51	assert(top >= bottom && top <= (oop*) chunk->top(), "just checking");
duke@435	52	// during GC phase 3, a handle may be a forward pointer that
duke@435	53	// is not yet valid, so loosen the assertion
duke@435	54	while (bottom < top) {
duke@435	55	// assert((*bottom)->is_oop(), "handle should point to oop");
duke@435	56	assert(Universe::heap()->is_in(*bottom), "handle should be valid heap address");
duke@435	57	f->do_oop(bottom++);
duke@435	58	}
duke@435	59	return handles_visited;
duke@435	60	}
duke@435	61
duke@435	62	// Used for debugging handle allocation.
duke@435	63	NOT_PRODUCT(jint _nof_handlemarks = 0;)
duke@435	64
duke@435	65	void HandleArea::oops_do(OopClosure* f) {
duke@435	66	uintx handles_visited = 0;
duke@435	67	// First handle the current chunk. It is filled to the high water mark.
duke@435	68	handles_visited += chunk_oops_do(f, _chunk, _hwm);
duke@435	69	// Then handle all previous chunks. They are completely filled.
duke@435	70	Chunk* k = _first;
duke@435	71	while(k != _chunk) {
duke@435	72	handles_visited += chunk_oops_do(f, k, k->top());
duke@435	73	k = k->next();
duke@435	74	}
duke@435	75
duke@435	76	// The thread local handle areas should not get very large
duke@435	77	if (TraceHandleAllocation && handles_visited > TotalHandleAllocationLimit) {
duke@435	78	#ifdef ASSERT
duke@435	79	warning("%d: Visited in HandleMark : %d",
duke@435	80	_nof_handlemarks, handles_visited);
duke@435	81	#else
duke@435	82	warning("Visited in HandleMark : %d", handles_visited);
duke@435	83	#endif
duke@435	84	}
duke@435	85	if (_prev != NULL) _prev->oops_do(f);
duke@435	86	}
duke@435	87
duke@435	88	void HandleMark::initialize(Thread* thread) {
duke@435	89	_thread = thread;
duke@435	90	// Save area
duke@435	91	_area = thread->handle_area();
duke@435	92	// Save current top
duke@435	93	_chunk = _area->_chunk;
duke@435	94	_hwm = _area->_hwm;
duke@435	95	_max = _area->_max;
duke@435	96	NOT_PRODUCT(_size_in_bytes = _area->_size_in_bytes;)
duke@435	97	debug_only(_area->_handle_mark_nesting++);
duke@435	98	assert(_area->_handle_mark_nesting > 0, "must stack allocate HandleMarks");
duke@435	99	debug_only(Atomic::inc(&_nof_handlemarks);)
duke@435	100
duke@435	101	// Link this in the thread
duke@435	102	set_previous_handle_mark(thread->last_handle_mark());
duke@435	103	thread->set_last_handle_mark(this);
duke@435	104	}
duke@435	105
duke@435	106
duke@435	107	HandleMark::~HandleMark() {
duke@435	108	HandleArea* area = _area; // help compilers with poor alias analysis
duke@435	109	assert(area == _thread->handle_area(), "sanity check");
duke@435	110	assert(area->_handle_mark_nesting > 0, "must stack allocate HandleMarks" );
duke@435	111	debug_only(area->_handle_mark_nesting--);
duke@435	112
duke@435	113	// Debug code to trace the number of handles allocated per mark/
duke@435	114	#ifdef ASSERT
duke@435	115	if (TraceHandleAllocation) {
duke@435	116	size_t handles = 0;
duke@435	117	Chunk *c = _chunk->next();
duke@435	118	if (c == NULL) {
duke@435	119	handles = area->_hwm - _hwm; // no new chunk allocated
duke@435	120	} else {
duke@435	121	handles = _max - _hwm; // add rest in first chunk
duke@435	122	while(c != NULL) {
duke@435	123	handles += c->length();
duke@435	124	c = c->next();
duke@435	125	}
duke@435	126	handles -= area->_max - area->_hwm; // adjust for last trunk not full
duke@435	127	}
duke@435	128	handles /= sizeof(void *); // Adjust for size of a handle
duke@435	129	if (handles > HandleAllocationLimit) {
duke@435	130	// Note: _nof_handlemarks is only set in debug mode
duke@435	131	warning("%d: Allocated in HandleMark : %d", _nof_handlemarks, handles);
duke@435	132	}
duke@435	133	}
duke@435	134	#endif
duke@435	135
duke@435	136	// Delete later chunks
duke@435	137	if( _chunk->next() ) {
duke@435	138	_chunk->next_chop();
duke@435	139	}
duke@435	140	// Roll back arena to saved top markers
duke@435	141	area->_chunk = _chunk;
duke@435	142	area->_hwm = _hwm;
duke@435	143	area->_max = _max;
duke@435	144	NOT_PRODUCT(area->set_size_in_bytes(_size_in_bytes);)
duke@435	145	#ifdef ASSERT
duke@435	146	// clear out first chunk (to detect allocation bugs)
duke@435	147	if (ZapVMHandleArea) {
duke@435	148	memset(_hwm, badHandleValue, _max - _hwm);
duke@435	149	}
duke@435	150	Atomic::dec(&_nof_handlemarks);
duke@435	151	#endif
duke@435	152
duke@435	153	// Unlink this from the thread
duke@435	154	_thread->set_last_handle_mark(previous_handle_mark());
duke@435	155	}
duke@435	156
duke@435	157	#ifdef ASSERT
duke@435	158
duke@435	159	NoHandleMark::NoHandleMark() {
duke@435	160	HandleArea* area = Thread::current()->handle_area();
duke@435	161	area->_no_handle_mark_nesting++;
duke@435	162	assert(area->_no_handle_mark_nesting > 0, "must stack allocate NoHandleMark" );
duke@435	163	}
duke@435	164
duke@435	165
duke@435	166	NoHandleMark::~NoHandleMark() {
duke@435	167	HandleArea* area = Thread::current()->handle_area();
duke@435	168	assert(area->_no_handle_mark_nesting > 0, "must stack allocate NoHandleMark" );
duke@435	169	area->_no_handle_mark_nesting--;
duke@435	170	}
duke@435	171
duke@435	172
duke@435	173	ResetNoHandleMark::ResetNoHandleMark() {
duke@435	174	HandleArea* area = Thread::current()->handle_area();
duke@435	175	_no_handle_mark_nesting = area->_no_handle_mark_nesting;
duke@435	176	area->_no_handle_mark_nesting = 0;
duke@435	177	}
duke@435	178
duke@435	179
duke@435	180	ResetNoHandleMark::~ResetNoHandleMark() {
duke@435	181	HandleArea* area = Thread::current()->handle_area();
duke@435	182	area->_no_handle_mark_nesting = _no_handle_mark_nesting;
duke@435	183	}
duke@435	184
duke@435	185	#endif