src/hotspot/share/classfile/placeholders.hpp
author erikj
Tue, 12 Sep 2017 19:03:39 +0200
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parent 46742 hotspot/src/share/vm/classfile/placeholders.hpp@24ec8a039c90
child 53244 9807daeb47c4
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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_PLACEHOLDERS_HPP
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#define SHARE_VM_CLASSFILE_PLACEHOLDERS_HPP
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#include "runtime/thread.hpp"
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#include "utilities/hashtable.hpp"
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class PlaceholderEntry;
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// Placeholder objects. These represent classes currently
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// being loaded, as well as arrays of primitives.
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//
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class PlaceholderTable : public Hashtable<Symbol*, mtClass> {
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public:
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  PlaceholderTable(int table_size);
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  PlaceholderEntry* new_entry(int hash, Symbol* name, ClassLoaderData* loader_data, bool havesupername, Symbol* supername);
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  void free_entry(PlaceholderEntry* entry);
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  PlaceholderEntry* bucket(int i) const {
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    return (PlaceholderEntry*)Hashtable<Symbol*, mtClass>::bucket(i);
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  }
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  PlaceholderEntry** bucket_addr(int i) {
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    return (PlaceholderEntry**)Hashtable<Symbol*, mtClass>::bucket_addr(i);
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  }
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  void add_entry(int index, PlaceholderEntry* new_entry) {
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    Hashtable<Symbol*, mtClass>::add_entry(index, (HashtableEntry<Symbol*, mtClass>*)new_entry);
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  }
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  void add_entry(int index, unsigned int hash, Symbol* name,
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                ClassLoaderData* loader_data, bool havesupername, Symbol* supername);
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  // This returns a Symbol* to match type for SystemDictionary
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  Symbol* find_entry(int index, unsigned int hash,
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                       Symbol* name, ClassLoaderData* loader_data);
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  PlaceholderEntry* get_entry(int index, unsigned int hash,
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                       Symbol* name, ClassLoaderData* loader_data);
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// caller to create a placeholder entry must enumerate an action
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// caller claims ownership of that action
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// For parallel classloading:
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// multiple LOAD_INSTANCE threads can proceed in parallel
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// multiple LOAD_SUPER threads can proceed in parallel
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// LOAD_SUPER needed to check for class circularity
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// DEFINE_CLASS: ultimately define class must be single threaded
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// on a class/classloader basis
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// so the head of that queue owns the token
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// and the rest of the threads return the result the first thread gets
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 enum classloadAction {
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    LOAD_INSTANCE = 1,             // calling load_instance_class
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    LOAD_SUPER = 2,                // loading superclass for this class
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    DEFINE_CLASS = 3               // find_or_define class
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 };
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  // find_and_add returns probe pointer - old or new
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  // If no entry exists, add a placeholder entry and push SeenThread for classloadAction
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  // If entry exists, reuse entry and push SeenThread for classloadAction
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  PlaceholderEntry* find_and_add(int index, unsigned int hash,
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                                 Symbol* name, ClassLoaderData* loader_data,
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                                 classloadAction action, Symbol* supername,
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                                 Thread* thread);
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  void remove_entry(int index, unsigned int hash,
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                    Symbol* name, ClassLoaderData* loader_data);
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  // find_and_remove first removes SeenThread for classloadAction
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  // If all queues are empty and definer is null, remove the PlacheholderEntry completely
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  void find_and_remove(int index, unsigned int hash,
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                       Symbol* name, ClassLoaderData* loader_data,
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                       classloadAction action, Thread* thread);
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  void print_on(outputStream* st) const;
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  void verify();
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};
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// SeenThread objects represent list of threads that are
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// currently performing a load action on a class.
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// For class circularity, set before loading a superclass.
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// For bootclasssearchpath, set before calling load_instance_class.
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// Defining must be single threaded on a class/classloader basis
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// For DEFINE_CLASS, the head of the queue owns the
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// define token and the rest of the threads wait to return the
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// result the first thread gets.
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class SeenThread: public CHeapObj<mtInternal> {
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   Thread *_thread;
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   SeenThread* _stnext;
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   SeenThread* _stprev;
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   SeenThread(Thread *thread) {
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       _thread = thread;
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       _stnext = NULL;
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       _stprev = NULL;
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   }
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   Thread* thread()                const { return _thread;}
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   void set_thread(Thread *thread) { _thread = thread; }
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   SeenThread* next()              const { return _stnext;}
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   void set_next(SeenThread *seen) { _stnext = seen; }
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   void set_prev(SeenThread *seen) { _stprev = seen; }
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  void print_action_queue(outputStream* st) {
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    SeenThread* seen = this;
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    while (seen != NULL) {
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      seen->thread()->print_value_on(st);
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      st->print(", ");
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      seen = seen->next();
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    }
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  }
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};
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// Placeholder objects represent classes currently being loaded.
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// All threads examining the placeholder table must hold the
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// SystemDictionary_lock, so we don't need special precautions
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// on store ordering here.
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// The system dictionary is the only user of this class.
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class PlaceholderEntry : public HashtableEntry<Symbol*, mtClass> {
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 private:
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  ClassLoaderData*  _loader_data;   // initiating loader
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  bool              _havesupername; // distinguish between null supername, and unknown
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  Symbol*           _supername;
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  Thread*           _definer;       // owner of define token
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  InstanceKlass*    _instanceKlass; // InstanceKlass from successful define
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  SeenThread*       _superThreadQ;  // doubly-linked queue of Threads loading a superclass for this class
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  SeenThread*       _loadInstanceThreadQ;  // loadInstance thread
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                                    // can be multiple threads if classloader object lock broken by application
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                                    // or if classloader supports parallel classloading
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  SeenThread*       _defineThreadQ; // queue of Threads trying to define this class
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                                    // including _definer
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                                    // _definer owns token
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                                    // queue waits for and returns results from _definer
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  // Simple accessors, used only by SystemDictionary
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  Symbol*            klassname()           const { return literal(); }
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  ClassLoaderData*   loader_data()         const { return _loader_data; }
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  void               set_loader_data(ClassLoaderData* loader_data) { _loader_data = loader_data; }
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  bool               havesupername()       const { return _havesupername; }
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  void               set_havesupername(bool havesupername) { _havesupername = havesupername; }
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  Symbol*            supername()           const { return _supername; }
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  void               set_supername(Symbol* supername) {
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    _supername = supername;
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    if (_supername != NULL) _supername->increment_refcount();
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  }
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  Thread*            definer()             const {return _definer; }
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  void               set_definer(Thread* definer) { _definer = definer; }
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  InstanceKlass*     instance_klass()      const {return _instanceKlass; }
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  void               set_instance_klass(InstanceKlass* ik) { _instanceKlass = ik; }
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  SeenThread*        superThreadQ()        const { return _superThreadQ; }
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  void               set_superThreadQ(SeenThread* SeenThread) { _superThreadQ = SeenThread; }
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  SeenThread*        loadInstanceThreadQ() const { return _loadInstanceThreadQ; }
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  void               set_loadInstanceThreadQ(SeenThread* SeenThread) { _loadInstanceThreadQ = SeenThread; }
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  SeenThread*        defineThreadQ()        const { return _defineThreadQ; }
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  void               set_defineThreadQ(SeenThread* SeenThread) { _defineThreadQ = SeenThread; }
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  PlaceholderEntry* next() const {
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    return (PlaceholderEntry*)HashtableEntry<Symbol*, mtClass>::next();
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  }
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  PlaceholderEntry** next_addr() {
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    return (PlaceholderEntry**)HashtableEntry<Symbol*, mtClass>::next_addr();
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  }
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  // Test for equality
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  // Entries are unique for class/classloader name pair
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  bool equals(Symbol* class_name, ClassLoaderData* loader) const {
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    return (klassname() == class_name && loader_data() == loader);
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  }
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  SeenThread* actionToQueue(PlaceholderTable::classloadAction action) {
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    SeenThread* queuehead = NULL;
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    switch (action) {
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      case PlaceholderTable::LOAD_INSTANCE:
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         queuehead = _loadInstanceThreadQ;
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         break;
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      case PlaceholderTable::LOAD_SUPER:
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         queuehead = _superThreadQ;
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         break;
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      case PlaceholderTable::DEFINE_CLASS:
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         queuehead = _defineThreadQ;
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         break;
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      default: Unimplemented();
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    }
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    return queuehead;
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  }
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  void set_threadQ(SeenThread* seenthread, PlaceholderTable::classloadAction action) {
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    switch (action) {
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      case PlaceholderTable::LOAD_INSTANCE:
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         _loadInstanceThreadQ = seenthread;
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         break;
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      case PlaceholderTable::LOAD_SUPER:
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         _superThreadQ = seenthread;
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         break;
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      case PlaceholderTable::DEFINE_CLASS:
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         _defineThreadQ = seenthread;
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         break;
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      default: Unimplemented();
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    }
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    return;
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  }
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  bool super_load_in_progress() {
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     return (_superThreadQ != NULL);
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  }
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  bool instance_load_in_progress() {
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    return (_loadInstanceThreadQ != NULL);
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  }
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  bool define_class_in_progress() {
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    return (_defineThreadQ != NULL);
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  }
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// Doubly-linked list of Threads per action for class/classloader pair
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// Class circularity support: links in thread before loading superclass
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// bootstrapsearchpath support: links in a thread before load_instance_class
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// definers: use as queue of define requestors, including owner of
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// define token. Appends for debugging of requestor order
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  void add_seen_thread(Thread* thread, PlaceholderTable::classloadAction action) {
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    assert_lock_strong(SystemDictionary_lock);
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    SeenThread* threadEntry = new SeenThread(thread);
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    SeenThread* seen = actionToQueue(action);
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    if (seen == NULL) {
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      set_threadQ(threadEntry, action);
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      return;
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    }
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    SeenThread* next;
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    while ((next = seen->next()) != NULL) {
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      seen = next;
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    }
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    seen->set_next(threadEntry);
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    threadEntry->set_prev(seen);
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    return;
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  }
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  bool check_seen_thread(Thread* thread, PlaceholderTable::classloadAction action) {
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    assert_lock_strong(SystemDictionary_lock);
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    SeenThread* threadQ = actionToQueue(action);
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    SeenThread* seen = threadQ;
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    while (seen) {
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      if (thread == seen->thread()) {
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        return true;
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      }
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      seen = seen->next();
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    }
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    return false;
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  }
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  // returns true if seenthreadQ is now empty
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  // Note, caller must ensure probe still exists while holding
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  // SystemDictionary_lock
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  // ignores if cleanup has already been done
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  // if found, deletes SeenThread
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  bool remove_seen_thread(Thread* thread, PlaceholderTable::classloadAction action) {
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    assert_lock_strong(SystemDictionary_lock);
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    SeenThread* threadQ = actionToQueue(action);
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    SeenThread* seen = threadQ;
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    SeenThread* prev = NULL;
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    while (seen) {
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      if (thread == seen->thread()) {
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        if (prev) {
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          prev->set_next(seen->next());
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        } else {
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          set_threadQ(seen->next(), action);
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        }
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        if (seen->next()) {
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          seen->next()->set_prev(prev);
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        }
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        delete seen;
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        break;
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      }
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      prev = seen;
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      seen = seen->next();
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    }
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    return (actionToQueue(action) == NULL);
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  }
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  // Print method doesn't append a cr
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  void print_entry(outputStream* st) const;
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  void verify() const;
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};
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#endif // SHARE_VM_CLASSFILE_PLACEHOLDERS_HPP