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src/share/vm/classfile/loaderConstraints.hpp@246d977b51f2 (annotated)

src/share/vm/classfile/loaderConstraints.hpp

Mon, 25 Jun 2012 21:33:35 -0400

author

coleenp

date

Mon, 25 Jun 2012 21:33:35 -0400

changeset 3875

246d977b51f2

parent 2708

1d1603768966

child 3900

d2a62e0f25eb

permissions

-rw-r--r--

7178670: runtime/7158800/BadUtf8.java fails in SymbolTable::rehash_table
Summary: Cannot delete _buckets and HashtableEntries in shared space (CDS)
Reviewed-by: acorn, kvn, dlong, dcubed, kamg

duke@435	1	/*
trims@2708	2	* Copyright (c) 2003, 2011, 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	#ifndef SHARE_VM_CLASSFILE_LOADERCONSTRAINTS_HPP
stefank@2314	26	#define SHARE_VM_CLASSFILE_LOADERCONSTRAINTS_HPP
stefank@2314	27
stefank@2314	28	#include "classfile/dictionary.hpp"
stefank@2314	29	#include "classfile/placeholders.hpp"
stefank@2314	30	#include "utilities/hashtable.hpp"
stefank@2314	31
duke@435	32	class LoaderConstraintEntry;
duke@435	33
coleenp@2497	34	class LoaderConstraintTable : public Hashtable<klassOop> {
duke@435	35	friend class VMStructs;
duke@435	36	private:
duke@435	37
duke@435	38	enum Constants {
duke@435	39	_loader_constraint_size = 107, // number of entries in constraint table
duke@435	40	_nof_buckets = 1009 // number of buckets in hash table
duke@435	41	};
duke@435	42
coleenp@2497	43	LoaderConstraintEntry** find_loader_constraint(Symbol* name,
duke@435	44	Handle loader);
duke@435	45
duke@435	46	public:
duke@435	47
duke@435	48	LoaderConstraintTable(int nof_buckets);
duke@435	49
coleenp@2497	50	LoaderConstraintEntry* new_entry(unsigned int hash, Symbol* name,
duke@435	51	klassOop klass, int num_loaders,
duke@435	52	int max_loaders);
coleenp@2497	53	void free_entry(LoaderConstraintEntry *entry);
duke@435	54
duke@435	55	LoaderConstraintEntry* bucket(int i) {
coleenp@2497	56	return (LoaderConstraintEntry*)Hashtable<klassOop>::bucket(i);
duke@435	57	}
duke@435	58
duke@435	59	LoaderConstraintEntry** bucket_addr(int i) {
coleenp@2497	60	return (LoaderConstraintEntry**)Hashtable<klassOop>::bucket_addr(i);
duke@435	61	}
duke@435	62
duke@435	63	// GC support
duke@435	64	void oops_do(OopClosure* f);
duke@435	65
duke@435	66	// Check class loader constraints
coleenp@2497	67	bool add_entry(Symbol* name, klassOop klass1, Handle loader1,
duke@435	68	klassOop klass2, Handle loader2);
duke@435	69
jrose@1100	70	// Note: The main entry point for this module is via SystemDictionary.
coleenp@2497	71	// SystemDictionary::check_signature_loaders(Symbol* signature,
jrose@1100	72	// Handle loader1, Handle loader2,
jrose@1100	73	// bool is_method, TRAPS)
duke@435	74
coleenp@2497	75	klassOop find_constrained_klass(Symbol* name, Handle loader);
duke@435	76
duke@435	77	// Class loader constraints
duke@435	78
duke@435	79	void ensure_loader_constraint_capacity(LoaderConstraintEntry *p, int nfree);
duke@435	80	void extend_loader_constraint(LoaderConstraintEntry* p, Handle loader,
duke@435	81	klassOop klass);
duke@435	82	void merge_loader_constraints(LoaderConstraintEntry** pp1,
duke@435	83	LoaderConstraintEntry** pp2, klassOop klass);
duke@435	84
duke@435	85	bool check_or_update(instanceKlassHandle k, Handle loader,
coleenp@2497	86	Symbol* name);
duke@435	87
duke@435	88
duke@435	89	void purge_loader_constraints(BoolObjectClosure* is_alive);
duke@435	90
tonyp@1693	91	void verify(Dictionary* dictionary, PlaceholderTable* placeholders);
duke@435	92	#ifndef PRODUCT
duke@435	93	void print();
duke@435	94	#endif
duke@435	95	};
duke@435	96
coleenp@2497	97	class LoaderConstraintEntry : public HashtableEntry<klassOop> {
duke@435	98	friend class VMStructs;
duke@435	99	private:
coleenp@2497	100	Symbol* _name; // class name
duke@435	101	int _num_loaders;
duke@435	102	int _max_loaders;
duke@435	103	oop* _loaders; // initiating loaders
duke@435	104
duke@435	105	public:
duke@435	106
coleenp@2497	107	klassOop klass() { return literal(); }
coleenp@2497	108	klassOop* klass_addr() { return literal_addr(); }
duke@435	109	void set_klass(klassOop k) { set_literal(k); }
duke@435	110
duke@435	111	LoaderConstraintEntry* next() {
coleenp@2497	112	return (LoaderConstraintEntry*)HashtableEntry<klassOop>::next();
duke@435	113	}
duke@435	114
duke@435	115	LoaderConstraintEntry** next_addr() {
coleenp@2497	116	return (LoaderConstraintEntry**)HashtableEntry<klassOop>::next_addr();
duke@435	117	}
duke@435	118	void set_next(LoaderConstraintEntry* next) {
coleenp@2497	119	HashtableEntry<klassOop>::set_next(next);
duke@435	120	}
duke@435	121
coleenp@2497	122	Symbol* name() { return _name; }
coleenp@2497	123	void set_name(Symbol* name) {
coleenp@2497	124	_name = name;
coleenp@2497	125	if (name != NULL) name->increment_refcount();
coleenp@2497	126	}
duke@435	127
duke@435	128	int num_loaders() { return _num_loaders; }
duke@435	129	void set_num_loaders(int i) { _num_loaders = i; }
duke@435	130
duke@435	131	int max_loaders() { return _max_loaders; }
duke@435	132	void set_max_loaders(int i) { _max_loaders = i; }
duke@435	133
duke@435	134	oop* loaders() { return _loaders; }
duke@435	135	void set_loaders(oop* loaders) { _loaders = loaders; }
duke@435	136
duke@435	137	oop loader(int i) { return _loaders[i]; }
duke@435	138	oop* loader_addr(int i) { return &_loaders[i]; }
duke@435	139	void set_loader(int i, oop p) { _loaders[i] = p; }
duke@435	140
duke@435	141	};
stefank@2314	142
stefank@2314	143	#endif // SHARE_VM_CLASSFILE_LOADERCONSTRAINTS_HPP