| /* |
| * Copyright (c) 2011, 2017, 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 "classfile/systemDictionary.hpp" |
| #include "gc/shared/specialized_oop_closures.hpp" |
| #include "oops/instanceKlass.hpp" |
| #include "runtime/handles.hpp" |
| #include "utilities/macros.hpp" |
| |
| class ClassFileParser; |
| |
| // 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 { |
| friend class VMStructs; |
| friend class InstanceKlass; |
| |
| private: |
| static int _offset_of_static_fields; |
| |
| InstanceMirrorKlass(const ClassFileParser& parser) : InstanceKlass(parser, InstanceKlass::_misc_kind_mirror) {} |
| |
| public: |
| InstanceMirrorKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); } |
| |
| // Casting from Klass* |
| static InstanceMirrorKlass* cast(Klass* k) { |
| assert(InstanceKlass::cast(k)->is_mirror_instance_klass(), |
| "cast to InstanceMirrorKlass"); |
| return static_cast<InstanceMirrorKlass*>(k); |
| } |
| |
| // 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*)(cast_from_oop<intptr_t>(obj) + offset_of_static_fields()); |
| } |
| |
| static void init_offset_of_static_fields() { |
| // Cache the offset of the static fields in the Class instance |
| assert(_offset_of_static_fields == 0, "once"); |
| _offset_of_static_fields = InstanceMirrorKlass::cast(SystemDictionary::Class_klass())->size_helper() << LogHeapWordSize; |
| } |
| |
| static int offset_of_static_fields() { |
| return _offset_of_static_fields; |
| } |
| |
| int compute_static_oop_field_count(oop obj); |
| |
| // Given a Klass return the size of the instance |
| int instance_size(Klass* k); |
| |
| // allocation |
| instanceOop allocate_instance(Klass* k, TRAPS); |
| |
| // GC specific object visitors |
| // |
| #if INCLUDE_ALL_GCS |
| // Parallel Scavenge |
| void oop_ps_push_contents( oop obj, PSPromotionManager* pm); |
| // Parallel Compact |
| void oop_pc_follow_contents(oop obj, ParCompactionManager* cm); |
| void oop_pc_update_pointers(oop obj, ParCompactionManager* cm); |
| #endif |
| |
| // Oop fields (and metadata) iterators |
| // [nv = true] Use non-virtual calls to do_oop_nv. |
| // [nv = false] Use virtual calls to do_oop. |
| // |
| // The InstanceMirrorKlass iterators also visit the hidden Klass pointer. |
| |
| public: |
| // Iterate over the static fields. |
| template <bool nv, class OopClosureType> |
| inline void oop_oop_iterate_statics(oop obj, OopClosureType* closure); |
| |
| private: |
| // Iterate over the static fields. |
| // Specialized for [T = oop] or [T = narrowOop]. |
| template <bool nv, typename T, class OopClosureType> |
| inline void oop_oop_iterate_statics_specialized(oop obj, OopClosureType* closure); |
| |
| // Forward iteration |
| // Iterate over the oop fields and metadata. |
| template <bool nv, class OopClosureType> |
| inline void oop_oop_iterate(oop obj, OopClosureType* closure); |
| |
| |
| // Reverse iteration |
| #if INCLUDE_ALL_GCS |
| // Iterate over the oop fields and metadata. |
| template <bool nv, class OopClosureType> |
| inline void oop_oop_iterate_reverse(oop obj, OopClosureType* closure); |
| #endif |
| |
| |
| // Bounded range iteration |
| // Iterate over the oop fields and metadata. |
| template <bool nv, class OopClosureType> |
| inline void oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr); |
| |
| // Iterate over the static fields. |
| template <bool nv, class OopClosureType> |
| inline void oop_oop_iterate_statics_bounded(oop obj, OopClosureType* closure, MemRegion mr); |
| |
| // Iterate over the static fields. |
| // Specialized for [T = oop] or [T = narrowOop]. |
| template <bool nv, typename T, class OopClosureType> |
| inline void oop_oop_iterate_statics_specialized_bounded(oop obj, OopClosureType* closure, MemRegion mr); |
| |
| |
| public: |
| |
| ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL) |
| ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL) |
| |
| #if INCLUDE_ALL_GCS |
| ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL_BACKWARDS) |
| ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL_BACKWARDS) |
| #endif // INCLUDE_ALL_GCS |
| }; |
| |
| #endif // SHARE_VM_OOPS_INSTANCEMIRRORKLASS_HPP |