/* * Copyright (c) 2011 Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ #ifndef SHARE_VM_OOPS_INSTANCEMIRRORKLASS_HPP #define SHARE_VM_OOPS_INSTANCEMIRRORKLASS_HPP #include "oops/instanceKlass.hpp" // An instanceMirrorKlass is a specialized instanceKlass for // java.lang.Class instances. These instances are special because // they contain the static fields of the class in addition to the // normal fields of Class. This means they are variable sized // instances and need special logic for computing their size and for // iteration of their oops. class instanceMirrorKlass: public instanceKlass { private: static int _offset_of_static_fields; public: // Type testing bool oop_is_instanceMirror() const { return true; } // Casting from klassOop static instanceMirrorKlass* cast(klassOop k) { assert(k->klass_part()->oop_is_instanceMirror(), "cast to instanceMirrorKlass"); return (instanceMirrorKlass*) k->klass_part(); } // Returns the size of the instance including the extra static fields. virtual int oop_size(oop obj) const; // Static field offset is an offset into the Heap, should be converted by // based on UseCompressedOop for traversal static HeapWord* start_of_static_fields(oop obj) { return (HeapWord*)((intptr_t)obj + offset_of_static_fields()); } static void set_offset_of_static_fields(int offset) { assert(_offset_of_static_fields == 0, "once"); _offset_of_static_fields = offset; } static int offset_of_static_fields() { return _offset_of_static_fields; } int compute_static_oop_field_size(oop obj); // Given a Klass return the size of the instance int instance_size(KlassHandle k); // allocation DEFINE_ALLOCATE_PERMANENT(instanceMirrorKlass); instanceOop allocate_instance(KlassHandle k, TRAPS); // Garbage collection int oop_adjust_pointers(oop obj); void oop_follow_contents(oop obj); // Parallel Scavenge and Parallel Old PARALLEL_GC_DECLS int oop_oop_iterate(oop obj, OopClosure* blk) { return oop_oop_iterate_v(obj, blk); } int oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr) { return oop_oop_iterate_v_m(obj, blk, mr); } #define InstanceMirrorKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \ int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk); \ int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, MemRegion mr); ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceMirrorKlass_OOP_OOP_ITERATE_DECL) ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceMirrorKlass_OOP_OOP_ITERATE_DECL) #ifndef SERIALGC #define InstanceMirrorKlass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \ int oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* blk); ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceMirrorKlass_OOP_OOP_ITERATE_BACKWARDS_DECL) ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceMirrorKlass_OOP_OOP_ITERATE_BACKWARDS_DECL) #endif // !SERIALGC }; #endif // SHARE_VM_OOPS_INSTANCEMIRRORKLASS_HPP