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src/share/vm/classfile/metadataOnStackMark.cpp@710a3c8b516e (annotated)

src/share/vm/classfile/metadataOnStackMark.cpp

Tue, 08 Aug 2017 15:57:29 +0800

author

aoqi

date

Tue, 08 Aug 2017 15:57:29 +0800

changeset 6876

710a3c8b516e

parent 6122

0b9ea9a72436

parent 0

f90c822e73f8

child 7535

7ae4e26cb1e0

permissions

-rw-r--r--

merge

aoqi@0	1	/*
aoqi@0	2	* Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
aoqi@0	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0	4	*
aoqi@0	5	* This code is free software; you can redistribute it and/or modify it
aoqi@0	6	* under the terms of the GNU General Public License version 2 only, as
aoqi@0	7	* published by the Free Software Foundation.
aoqi@0	8	*
aoqi@0	9	* This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
aoqi@0	12	* version 2 for more details (a copy is included in the LICENSE file that
aoqi@0	13	* accompanied this code).
aoqi@0	14	*
aoqi@0	15	* You should have received a copy of the GNU General Public License version
aoqi@0	16	* 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0	18	*
aoqi@0	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0	20	* or visit www.oracle.com if you need additional information or have any
aoqi@0	21	* questions.
aoqi@0	22	*
aoqi@0	23	*/
aoqi@0	24
aoqi@0	25	#include "precompiled.hpp"
aoqi@0	26	#include "classfile/metadataOnStackMark.hpp"
aoqi@0	27	#include "code/codeCache.hpp"
aoqi@0	28	#include "compiler/compileBroker.hpp"
aoqi@0	29	#include "oops/metadata.hpp"
aoqi@0	30	#include "prims/jvmtiImpl.hpp"
aoqi@0	31	#include "runtime/synchronizer.hpp"
aoqi@0	32	#include "runtime/thread.hpp"
aoqi@0	33	#include "services/threadService.hpp"
aoqi@0	34	#include "utilities/growableArray.hpp"
aoqi@0	35
aoqi@0	36
aoqi@0	37	// Keep track of marked on-stack metadata so it can be cleared.
aoqi@0	38	GrowableArray<Metadata*>* _marked_objects = NULL;
aoqi@0	39	NOT_PRODUCT(bool MetadataOnStackMark::_is_active = false;)
aoqi@0	40
aoqi@0	41	// Walk metadata on the stack and mark it so that redefinition doesn't delete
aoqi@0	42	// it. Class unloading also walks the previous versions and might try to
aoqi@0	43	// delete it, so this class is used by class unloading also.
aoqi@0	44	MetadataOnStackMark::MetadataOnStackMark() {
aoqi@0	45	assert(SafepointSynchronize::is_at_safepoint(), "sanity check");
aoqi@0	46	NOT_PRODUCT(_is_active = true;)
aoqi@0	47	if (_marked_objects == NULL) {
aoqi@0	48	_marked_objects = new (ResourceObj::C_HEAP, mtClass) GrowableArray<Metadata*>(1000, true);
aoqi@0	49	}
aoqi@0	50	Threads::metadata_do(Metadata::mark_on_stack);
aoqi@0	51	CodeCache::alive_nmethods_do(nmethod::mark_on_stack);
aoqi@0	52	CompileBroker::mark_on_stack();
aoqi@0	53	JvmtiCurrentBreakpoints::metadata_do(Metadata::mark_on_stack);
aoqi@0	54	ThreadService::metadata_do(Metadata::mark_on_stack);
aoqi@0	55	}
aoqi@0	56
aoqi@0	57	MetadataOnStackMark::~MetadataOnStackMark() {
aoqi@0	58	assert(SafepointSynchronize::is_at_safepoint(), "sanity check");
aoqi@0	59	// Unmark everything that was marked. Can't do the same walk because
aoqi@0	60	// redefine classes messes up the code cache so the set of methods
aoqi@0	61	// might not be the same.
aoqi@0	62	for (int i = 0; i< _marked_objects->length(); i++) {
aoqi@0	63	_marked_objects->at(i)->set_on_stack(false);
aoqi@0	64	}
aoqi@0	65	_marked_objects->clear(); // reuse growable array for next time.
aoqi@0	66	NOT_PRODUCT(_is_active = false;)
aoqi@0	67	}
aoqi@0	68
aoqi@0	69	// Record which objects are marked so we can unmark the same objects.
aoqi@0	70	void MetadataOnStackMark::record(Metadata* m) {
aoqi@0	71	assert(_is_active, "metadata on stack marking is active");
aoqi@0	72	_marked_objects->push(m);
aoqi@0	73	}