hotspot/src/share/vm/classfile/loaderConstraints.hpp
author coleenp
Wed, 12 Apr 2017 08:02:29 -0400
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8026985: Rewrite SystemDictionary::classes_do and Dictionary::classes_do to use KlassClosure Summary: Actually remove unused functions like classes_do and methods_do. Reviewed-by: iveresov, sspitsyn, dholmes
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/*
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 * Copyright (c) 2003, 2017, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#ifndef SHARE_VM_CLASSFILE_LOADERCONSTRAINTS_HPP
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#define SHARE_VM_CLASSFILE_LOADERCONSTRAINTS_HPP
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#include "classfile/dictionary.hpp"
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#include "classfile/placeholders.hpp"
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#include "utilities/hashtable.hpp"
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class LoaderConstraintEntry;
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class Symbol;
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class LoaderConstraintTable : public Hashtable<InstanceKlass*, mtClass> {
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  friend class VMStructs;
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private:
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  enum Constants {
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    _loader_constraint_size = 107,                     // number of entries in constraint table
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    _nof_buckets            = 1009                     // number of buckets in hash table
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  };
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  LoaderConstraintEntry** find_loader_constraint(Symbol* name,
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                                                 Handle loader);
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  LoaderConstraintTable(int nof_buckets);
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  LoaderConstraintEntry* new_entry(unsigned int hash, Symbol* name,
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                                   InstanceKlass* klass, int num_loaders,
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                                   int max_loaders);
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  void free_entry(LoaderConstraintEntry *entry);
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  LoaderConstraintEntry* bucket(int i) {
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    return (LoaderConstraintEntry*)Hashtable<InstanceKlass*, mtClass>::bucket(i);
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  }
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  LoaderConstraintEntry** bucket_addr(int i) {
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    return (LoaderConstraintEntry**)Hashtable<InstanceKlass*, mtClass>::bucket_addr(i);
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  }
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  // Check class loader constraints
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  bool add_entry(Symbol* name, InstanceKlass* klass1, Handle loader1,
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                                    InstanceKlass* klass2, Handle loader2);
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  // Note:  The main entry point for this module is via SystemDictionary.
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  // SystemDictionary::check_signature_loaders(Symbol* signature,
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  //                                           Handle loader1, Handle loader2,
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  //                                           bool is_method, TRAPS)
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  InstanceKlass* find_constrained_klass(Symbol* name, Handle loader);
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  // Class loader constraints
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  void ensure_loader_constraint_capacity(LoaderConstraintEntry *p, int nfree);
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  void extend_loader_constraint(LoaderConstraintEntry* p, Handle loader,
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                                InstanceKlass* klass);
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  void merge_loader_constraints(LoaderConstraintEntry** pp1,
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                                LoaderConstraintEntry** pp2, InstanceKlass* klass);
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  bool check_or_update(InstanceKlass* k, Handle loader, Symbol* name);
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  void purge_loader_constraints();
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  void verify(Dictionary* dictionary, PlaceholderTable* placeholders);
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#ifndef PRODUCT
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  void print();
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#endif
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};
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class LoaderConstraintEntry : public HashtableEntry<InstanceKlass*, mtClass> {
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  friend class VMStructs;
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  Symbol*                _name;                   // class name
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  int                    _num_loaders;
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  int                    _max_loaders;
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  // Loader constraints enforce correct linking behavior.
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  // Thus, it really operates on ClassLoaderData which represents linking domain,
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  // not class loaders.
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  ClassLoaderData**              _loaders;                // initiating loaders
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  InstanceKlass* klass() { return literal(); }
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  InstanceKlass** klass_addr() { return literal_addr(); }
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  void set_klass(InstanceKlass* k) { set_literal(k); }
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  LoaderConstraintEntry* next() {
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    return (LoaderConstraintEntry*)HashtableEntry<InstanceKlass*, mtClass>::next();
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  }
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  LoaderConstraintEntry** next_addr() {
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    return (LoaderConstraintEntry**)HashtableEntry<InstanceKlass*, mtClass>::next_addr();
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  }
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  void set_next(LoaderConstraintEntry* next) {
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    HashtableEntry<InstanceKlass*, mtClass>::set_next(next);
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  }
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  Symbol* name() { return _name; }
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  void set_name(Symbol* name) {
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    _name = name;
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    if (name != NULL) name->increment_refcount();
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  }
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  int num_loaders() { return _num_loaders; }
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  void set_num_loaders(int i) { _num_loaders = i; }
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  int max_loaders() { return _max_loaders; }
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  void set_max_loaders(int i) { _max_loaders = i; }
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  ClassLoaderData** loaders() { return _loaders; }
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  void set_loaders(ClassLoaderData** loaders) { _loaders = loaders; }
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  ClassLoaderData* loader_data(int i) { return _loaders[i]; }
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  void set_loader_data(int i, ClassLoaderData* p) { _loaders[i] = p; }
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  // convenience
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  void set_loader(int i, oop p);
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};
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#endif // SHARE_VM_CLASSFILE_LOADERCONSTRAINTS_HPP