6578152: fill_region_with_object has usability and safety issues
Reviewed-by: apetrusenko, ysr
/* * Copyright 1999-2007 Sun Microsystems, Inc. All Rights Reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, * CA 95054 USA or visit www.sun.com if you need additional information or * have any questions. * */// ciObjectFactory//// This class handles requests for the creation of new instances// of ciObject and its subclasses. It contains a caching mechanism// which ensures that for each oop, at most one ciObject is created.// This invariant allows efficient implementation of ciObject.class ciObjectFactory : public ResourceObj {private: static volatile bool _initialized; static GrowableArray<ciObject*>* _shared_ci_objects; static ciSymbol* _shared_ci_symbols[]; static int _shared_ident_limit; Arena* _arena; GrowableArray<ciObject*>* _ci_objects; GrowableArray<ciMethod*>* _unloaded_methods; GrowableArray<ciKlass*>* _unloaded_klasses; GrowableArray<ciReturnAddress*>* _return_addresses; int _next_ident;public: struct NonPermObject : public ResourceObj { ciObject* _object; NonPermObject* _next; inline NonPermObject(NonPermObject* &bucket, oop key, ciObject* object); ciObject* object() { return _object; } NonPermObject* &next() { return _next; } };private: enum { NON_PERM_BUCKETS = 61 }; NonPermObject* _non_perm_bucket[NON_PERM_BUCKETS]; int _non_perm_count; int find(oop key, GrowableArray<ciObject*>* objects); bool is_found_at(int index, oop key, GrowableArray<ciObject*>* objects); void insert(int index, ciObject* obj, GrowableArray<ciObject*>* objects); ciObject* create_new_object(oop o); static bool is_equal(NonPermObject* p, oop key) { return p->object()->get_oop() == key; } NonPermObject* &find_non_perm(oop key); void insert_non_perm(NonPermObject* &where, oop key, ciObject* obj); void init_ident_of(ciObject* obj); Arena* arena() { return _arena; } void print_contents_impl();public: static bool is_initialized() { return _initialized; } static void initialize(); void init_shared_objects(); ciObjectFactory(Arena* arena, int expected_size); // Get the ciObject corresponding to some oop. ciObject* get(oop key); // Get the ciSymbol corresponding to one of the vmSymbols. static ciSymbol* vm_symbol_at(int index); // Get the ciMethod representing an unloaded/unfound method. ciMethod* get_unloaded_method(ciInstanceKlass* holder, ciSymbol* name, ciSymbol* signature); // Get a ciKlass representing an unloaded klass. ciKlass* get_unloaded_klass(ciKlass* accessing_klass, ciSymbol* name, bool create_if_not_found); // Get the ciMethodData representing the methodData for a method // with none. ciMethodData* get_empty_methodData(); ciReturnAddress* get_return_address(int bci); void print_contents(); void print();};