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src/share/vm/runtime/handles.cpp@b92c45f2bc75 (annotated)

src/share/vm/runtime/handles.cpp

Wed, 02 Feb 2011 11:35:26 -0500

author

bobv

date

Wed, 02 Feb 2011 11:35:26 -0500

changeset 2508

b92c45f2bc75

parent 2314

f95d63e2154a

child 3156

f08d439fab8c

permissions

-rw-r--r--

7016023: Enable building ARM and PPC from src/closed repository
Reviewed-by: dholmes, bdelsart

duke@435	1	/*
stefank@2314	2	* Copyright (c) 1997, 2010, Oracle and/or its affiliates. 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	*
trims@1907	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907	20	* or visit www.oracle.com if you need additional information or have any
trims@1907	21	* questions.
duke@435	22	*
duke@435	23	*/
duke@435	24
stefank@2314	25	#include "precompiled.hpp"
stefank@2314	26	#include "memory/allocation.inline.hpp"
stefank@2314	27	#include "oops/oop.inline.hpp"
stefank@2314	28	#include "runtime/handles.inline.hpp"
stefank@2314	29	#ifdef TARGET_OS_FAMILY_linux
stefank@2314	30	# include "os_linux.inline.hpp"
stefank@2314	31	# include "thread_linux.inline.hpp"
stefank@2314	32	#endif
stefank@2314	33	#ifdef TARGET_OS_FAMILY_solaris
stefank@2314	34	# include "os_solaris.inline.hpp"
stefank@2314	35	# include "thread_solaris.inline.hpp"
stefank@2314	36	#endif
stefank@2314	37	#ifdef TARGET_OS_FAMILY_windows
stefank@2314	38	# include "os_windows.inline.hpp"
stefank@2314	39	# include "thread_windows.inline.hpp"
stefank@2314	40	#endif
duke@435	41
duke@435	42	#ifdef ASSERT
duke@435	43	oop* HandleArea::allocate_handle(oop obj) {
duke@435	44	assert(_handle_mark_nesting > 1, "memory leak: allocating handle outside HandleMark");
duke@435	45	assert(_no_handle_mark_nesting == 0, "allocating handle inside NoHandleMark");
duke@435	46	assert(SharedSkipVerify || obj->is_oop(), "sanity check");
duke@435	47	return real_allocate_handle(obj);
duke@435	48	}
duke@435	49
duke@435	50	Handle::Handle(Thread* thread, oop obj) {
duke@435	51	assert(thread == Thread::current(), "sanity check");
duke@435	52	if (obj == NULL) {
duke@435	53	_handle = NULL;
duke@435	54	} else {
duke@435	55	_handle = thread->handle_area()->allocate_handle(obj);
duke@435	56	}
duke@435	57	}
duke@435	58
duke@435	59	#endif
duke@435	60
duke@435	61	static uintx chunk_oops_do(OopClosure* f, Chunk* chunk, char* chunk_top) {
duke@435	62	oop* bottom = (oop*) chunk->bottom();
duke@435	63	oop* top = (oop*) chunk_top;
duke@435	64	uintx handles_visited = top - bottom;
duke@435	65	assert(top >= bottom && top <= (oop*) chunk->top(), "just checking");
duke@435	66	// during GC phase 3, a handle may be a forward pointer that
duke@435	67	// is not yet valid, so loosen the assertion
duke@435	68	while (bottom < top) {
duke@435	69	// assert((*bottom)->is_oop(), "handle should point to oop");
duke@435	70	assert(Universe::heap()->is_in(*bottom), "handle should be valid heap address");
duke@435	71	f->do_oop(bottom++);
duke@435	72	}
duke@435	73	return handles_visited;
duke@435	74	}
duke@435	75
duke@435	76	// Used for debugging handle allocation.
duke@435	77	NOT_PRODUCT(jint _nof_handlemarks = 0;)
duke@435	78
duke@435	79	void HandleArea::oops_do(OopClosure* f) {
duke@435	80	uintx handles_visited = 0;
duke@435	81	// First handle the current chunk. It is filled to the high water mark.
duke@435	82	handles_visited += chunk_oops_do(f, _chunk, _hwm);
duke@435	83	// Then handle all previous chunks. They are completely filled.
duke@435	84	Chunk* k = _first;
duke@435	85	while(k != _chunk) {
duke@435	86	handles_visited += chunk_oops_do(f, k, k->top());
duke@435	87	k = k->next();
duke@435	88	}
duke@435	89
duke@435	90	// The thread local handle areas should not get very large
duke@435	91	if (TraceHandleAllocation && handles_visited > TotalHandleAllocationLimit) {
duke@435	92	#ifdef ASSERT
duke@435	93	warning("%d: Visited in HandleMark : %d",
duke@435	94	_nof_handlemarks, handles_visited);
duke@435	95	#else
duke@435	96	warning("Visited in HandleMark : %d", handles_visited);
duke@435	97	#endif
duke@435	98	}
duke@435	99	if (_prev != NULL) _prev->oops_do(f);
duke@435	100	}
duke@435	101
duke@435	102	void HandleMark::initialize(Thread* thread) {
duke@435	103	_thread = thread;
duke@435	104	// Save area
duke@435	105	_area = thread->handle_area();
duke@435	106	// Save current top
duke@435	107	_chunk = _area->_chunk;
duke@435	108	_hwm = _area->_hwm;
duke@435	109	_max = _area->_max;
duke@435	110	NOT_PRODUCT(_size_in_bytes = _area->_size_in_bytes;)
duke@435	111	debug_only(_area->_handle_mark_nesting++);
duke@435	112	assert(_area->_handle_mark_nesting > 0, "must stack allocate HandleMarks");
duke@435	113	debug_only(Atomic::inc(&_nof_handlemarks);)
duke@435	114
duke@435	115	// Link this in the thread
duke@435	116	set_previous_handle_mark(thread->last_handle_mark());
duke@435	117	thread->set_last_handle_mark(this);
duke@435	118	}
duke@435	119
duke@435	120
duke@435	121	HandleMark::~HandleMark() {
duke@435	122	HandleArea* area = _area; // help compilers with poor alias analysis
duke@435	123	assert(area == _thread->handle_area(), "sanity check");
duke@435	124	assert(area->_handle_mark_nesting > 0, "must stack allocate HandleMarks" );
duke@435	125	debug_only(area->_handle_mark_nesting--);
duke@435	126
duke@435	127	// Debug code to trace the number of handles allocated per mark/
duke@435	128	#ifdef ASSERT
duke@435	129	if (TraceHandleAllocation) {
duke@435	130	size_t handles = 0;
duke@435	131	Chunk *c = _chunk->next();
duke@435	132	if (c == NULL) {
duke@435	133	handles = area->_hwm - _hwm; // no new chunk allocated
duke@435	134	} else {
duke@435	135	handles = _max - _hwm; // add rest in first chunk
duke@435	136	while(c != NULL) {
duke@435	137	handles += c->length();
duke@435	138	c = c->next();
duke@435	139	}
duke@435	140	handles -= area->_max - area->_hwm; // adjust for last trunk not full
duke@435	141	}
duke@435	142	handles /= sizeof(void *); // Adjust for size of a handle
duke@435	143	if (handles > HandleAllocationLimit) {
duke@435	144	// Note: _nof_handlemarks is only set in debug mode
duke@435	145	warning("%d: Allocated in HandleMark : %d", _nof_handlemarks, handles);
duke@435	146	}
duke@435	147	}
duke@435	148	#endif
duke@435	149
duke@435	150	// Delete later chunks
duke@435	151	if( _chunk->next() ) {
duke@435	152	_chunk->next_chop();
duke@435	153	}
duke@435	154	// Roll back arena to saved top markers
duke@435	155	area->_chunk = _chunk;
duke@435	156	area->_hwm = _hwm;
duke@435	157	area->_max = _max;
duke@435	158	NOT_PRODUCT(area->set_size_in_bytes(_size_in_bytes);)
duke@435	159	#ifdef ASSERT
duke@435	160	// clear out first chunk (to detect allocation bugs)
duke@435	161	if (ZapVMHandleArea) {
duke@435	162	memset(_hwm, badHandleValue, _max - _hwm);
duke@435	163	}
duke@435	164	Atomic::dec(&_nof_handlemarks);
duke@435	165	#endif
duke@435	166
duke@435	167	// Unlink this from the thread
duke@435	168	_thread->set_last_handle_mark(previous_handle_mark());
duke@435	169	}
duke@435	170
duke@435	171	#ifdef ASSERT
duke@435	172
duke@435	173	NoHandleMark::NoHandleMark() {
duke@435	174	HandleArea* area = Thread::current()->handle_area();
duke@435	175	area->_no_handle_mark_nesting++;
duke@435	176	assert(area->_no_handle_mark_nesting > 0, "must stack allocate NoHandleMark" );
duke@435	177	}
duke@435	178
duke@435	179
duke@435	180	NoHandleMark::~NoHandleMark() {
duke@435	181	HandleArea* area = Thread::current()->handle_area();
duke@435	182	assert(area->_no_handle_mark_nesting > 0, "must stack allocate NoHandleMark" );
duke@435	183	area->_no_handle_mark_nesting--;
duke@435	184	}
duke@435	185
duke@435	186
duke@435	187	ResetNoHandleMark::ResetNoHandleMark() {
duke@435	188	HandleArea* area = Thread::current()->handle_area();
duke@435	189	_no_handle_mark_nesting = area->_no_handle_mark_nesting;
duke@435	190	area->_no_handle_mark_nesting = 0;
duke@435	191	}
duke@435	192
duke@435	193
duke@435	194	ResetNoHandleMark::~ResetNoHandleMark() {
duke@435	195	HandleArea* area = Thread::current()->handle_area();
duke@435	196	area->_no_handle_mark_nesting = _no_handle_mark_nesting;
duke@435	197	}
duke@435	198
duke@435	199	#endif