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src/share/vm/classfile/resolutionErrors.cpp@ac27a9c85bea (annotated)

src/share/vm/classfile/resolutionErrors.cpp

Thu, 24 May 2018 18:41:44 +0800

author

aoqi

date

Thu, 24 May 2018 18:41:44 +0800

changeset 8856

ac27a9c85bea

parent 6876

710a3c8b516e

child 10015

eb7ce841ccec

permissions

-rw-r--r--

Merge

aoqi@0	1	/*
aoqi@0	2	* Copyright (c) 2005, 2012, 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/resolutionErrors.hpp"
aoqi@0	27	#include "memory/resourceArea.hpp"
aoqi@0	28	#include "oops/oop.inline.hpp"
aoqi@0	29	#include "runtime/handles.inline.hpp"
aoqi@0	30	#include "runtime/safepoint.hpp"
aoqi@0	31	#include "utilities/hashtable.inline.hpp"
aoqi@0	32
aoqi@0	33	// add new entry to the table
aoqi@0	34	void ResolutionErrorTable::add_entry(int index, unsigned int hash,
aoqi@0	35	constantPoolHandle pool, int cp_index, Symbol* error)
aoqi@0	36	{
aoqi@0	37	assert_locked_or_safepoint(SystemDictionary_lock);
aoqi@0	38	assert(!pool.is_null() && error != NULL, "adding NULL obj");
aoqi@0	39
aoqi@0	40	ResolutionErrorEntry* entry = new_entry(hash, pool(), cp_index, error);
aoqi@0	41	add_entry(index, entry);
aoqi@0	42	}
aoqi@0	43
aoqi@0	44	// find entry in the table
aoqi@0	45	ResolutionErrorEntry* ResolutionErrorTable::find_entry(int index, unsigned int hash,
aoqi@0	46	constantPoolHandle pool, int cp_index)
aoqi@0	47	{
aoqi@0	48	assert_locked_or_safepoint(SystemDictionary_lock);
aoqi@0	49
aoqi@0	50	for (ResolutionErrorEntry *error_probe = bucket(index);
aoqi@0	51	error_probe != NULL;
aoqi@0	52	error_probe = error_probe->next()) {
aoqi@0	53	if (error_probe->hash() == hash && error_probe->pool() == pool()) {
aoqi@0	54	return error_probe;;
aoqi@0	55	}
aoqi@0	56	}
aoqi@0	57	return NULL;
aoqi@0	58	}
aoqi@0	59
aoqi@0	60	void ResolutionErrorEntry::set_error(Symbol* e) {
aoqi@0	61	assert(e == NULL || _error == NULL, "cannot reset error");
aoqi@0	62	_error = e;
aoqi@0	63	if (_error != NULL) _error->increment_refcount();
aoqi@0	64	}
aoqi@0	65
aoqi@0	66	// create new error entry
aoqi@0	67	ResolutionErrorEntry* ResolutionErrorTable::new_entry(int hash, ConstantPool* pool,
aoqi@0	68	int cp_index, Symbol* error)
aoqi@0	69	{
aoqi@0	70	ResolutionErrorEntry* entry = (ResolutionErrorEntry*)Hashtable<ConstantPool*, mtClass>::new_entry(hash, pool);
aoqi@0	71	entry->set_cp_index(cp_index);
aoqi@0	72	NOT_PRODUCT(entry->set_error(NULL);)
aoqi@0	73	entry->set_error(error);
aoqi@0	74
aoqi@0	75	return entry;
aoqi@0	76	}
aoqi@0	77
aoqi@0	78	void ResolutionErrorTable::free_entry(ResolutionErrorEntry *entry) {
aoqi@0	79	// decrement error refcount
aoqi@0	80	assert(entry->error() != NULL, "error should be set");
aoqi@0	81	entry->error()->decrement_refcount();
aoqi@0	82	Hashtable<ConstantPool*, mtClass>::free_entry(entry);
aoqi@0	83	}
aoqi@0	84
aoqi@0	85
aoqi@0	86	// create resolution error table
aoqi@0	87	ResolutionErrorTable::ResolutionErrorTable(int table_size)
aoqi@0	88	: Hashtable<ConstantPool*, mtClass>(table_size, sizeof(ResolutionErrorEntry)) {
aoqi@0	89	}
aoqi@0	90
aoqi@0	91	// RedefineClasses support - remove matching entry of a
aoqi@0	92	// constant pool that is going away
aoqi@0	93	void ResolutionErrorTable::delete_entry(ConstantPool* c) {
aoqi@0	94	assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
aoqi@0	95	for (int i = 0; i < table_size(); i++) {
aoqi@0	96	for (ResolutionErrorEntry** p = bucket_addr(i); *p != NULL; ) {
aoqi@0	97	ResolutionErrorEntry* entry = *p;
aoqi@0	98	assert(entry->pool() != NULL, "resolution error table is corrupt");
aoqi@0	99	if (entry->pool() == c) {
aoqi@0	100	*p = entry->next();
aoqi@0	101	free_entry(entry);
aoqi@0	102	} else {
aoqi@0	103	p = entry->next_addr();
aoqi@0	104	}
aoqi@0	105	}
aoqi@0	106	}
aoqi@0	107	}
aoqi@0	108
aoqi@0	109
aoqi@0	110	// Remove unloaded entries from the table
aoqi@0	111	void ResolutionErrorTable::purge_resolution_errors() {
aoqi@0	112	assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
aoqi@0	113	for (int i = 0; i < table_size(); i++) {
aoqi@0	114	for (ResolutionErrorEntry** p = bucket_addr(i); *p != NULL; ) {
aoqi@0	115	ResolutionErrorEntry* entry = *p;
aoqi@0	116	assert(entry->pool() != (ConstantPool*)NULL, "resolution error table is corrupt");
aoqi@0	117	ConstantPool* pool = entry->pool();
aoqi@0	118	assert(pool->pool_holder() != NULL, "Constant pool without a class?");
aoqi@0	119	ClassLoaderData* loader_data =
aoqi@0	120	pool->pool_holder()->class_loader_data();
aoqi@0	121	if (!loader_data->is_unloading()) {
aoqi@0	122	p = entry->next_addr();
aoqi@0	123	} else {
aoqi@0	124	*p = entry->next();
aoqi@0	125	free_entry(entry);
aoqi@0	126	}
aoqi@0	127	}
aoqi@0	128	}
aoqi@0	129	}