1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000 1.2 +++ b/src/share/vm/oops/instanceMirrorKlass.hpp Fri Mar 18 16:00:34 2011 -0700 1.3 @@ -0,0 +1,110 @@ 1.4 +/* 1.5 + * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved. 1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 1.7 + * 1.8 + * This code is free software; you can redistribute it and/or modify it 1.9 + * under the terms of the GNU General Public License version 2 only, as 1.10 + * published by the Free Software Foundation. 1.11 + * 1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT 1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 1.15 + * version 2 for more details (a copy is included in the LICENSE file that 1.16 + * accompanied this code). 1.17 + * 1.18 + * You should have received a copy of the GNU General Public License version 1.19 + * 2 along with this work; if not, write to the Free Software Foundation, 1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 1.21 + * 1.22 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 1.23 + * or visit www.oracle.com if you need additional information or have any 1.24 + * questions. 1.25 + * 1.26 + */ 1.27 + 1.28 +#ifndef SHARE_VM_OOPS_INSTANCEMIRRORKLASS_HPP 1.29 +#define SHARE_VM_OOPS_INSTANCEMIRRORKLASS_HPP 1.30 + 1.31 +#include "oops/instanceKlass.hpp" 1.32 + 1.33 +// An instanceMirrorKlass is a specialized instanceKlass for 1.34 +// java.lang.Class instances. These instances are special because 1.35 +// they contain the static fields of the class in addition to the 1.36 +// normal fields of Class. This means they are variable sized 1.37 +// instances and need special logic for computing their size and for 1.38 +// iteration of their oops. 1.39 + 1.40 + 1.41 +class instanceMirrorKlass: public instanceKlass { 1.42 + private: 1.43 + static int _offset_of_static_fields; 1.44 + 1.45 + public: 1.46 + // Type testing 1.47 + bool oop_is_instanceMirror() const { return true; } 1.48 + 1.49 + // Casting from klassOop 1.50 + static instanceMirrorKlass* cast(klassOop k) { 1.51 + assert(k->klass_part()->oop_is_instanceMirror(), "cast to instanceMirrorKlass"); 1.52 + return (instanceMirrorKlass*) k->klass_part(); 1.53 + } 1.54 + 1.55 + // Returns the size of the instance including the extra static fields. 1.56 + virtual int oop_size(oop obj) const; 1.57 + 1.58 + // Static field offset is an offset into the Heap, should be converted by 1.59 + // based on UseCompressedOop for traversal 1.60 + static HeapWord* start_of_static_fields(oop obj) { 1.61 + return (HeapWord*)((intptr_t)obj + offset_of_static_fields()); 1.62 + } 1.63 + 1.64 + static void init_offset_of_static_fields() { 1.65 + // Cache the offset of the static fields in the Class instance 1.66 + assert(_offset_of_static_fields == 0, "once"); 1.67 + _offset_of_static_fields = instanceMirrorKlass::cast(SystemDictionary::Class_klass())->size_helper() << LogHeapWordSize; 1.68 + } 1.69 + 1.70 + static int offset_of_static_fields() { 1.71 + return _offset_of_static_fields; 1.72 + } 1.73 + 1.74 + int compute_static_oop_field_count(oop obj); 1.75 + 1.76 + // Given a Klass return the size of the instance 1.77 + int instance_size(KlassHandle k); 1.78 + 1.79 + // allocation 1.80 + DEFINE_ALLOCATE_PERMANENT(instanceMirrorKlass); 1.81 + instanceOop allocate_instance(KlassHandle k, TRAPS); 1.82 + 1.83 + // Garbage collection 1.84 + int oop_adjust_pointers(oop obj); 1.85 + void oop_follow_contents(oop obj); 1.86 + 1.87 + // Parallel Scavenge and Parallel Old 1.88 + PARALLEL_GC_DECLS 1.89 + 1.90 + int oop_oop_iterate(oop obj, OopClosure* blk) { 1.91 + return oop_oop_iterate_v(obj, blk); 1.92 + } 1.93 + int oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr) { 1.94 + return oop_oop_iterate_v_m(obj, blk, mr); 1.95 + } 1.96 + 1.97 +#define InstanceMirrorKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \ 1.98 + int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk); \ 1.99 + int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, MemRegion mr); 1.100 + 1.101 + ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceMirrorKlass_OOP_OOP_ITERATE_DECL) 1.102 + ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceMirrorKlass_OOP_OOP_ITERATE_DECL) 1.103 + 1.104 +#ifndef SERIALGC 1.105 +#define InstanceMirrorKlass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \ 1.106 + int oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* blk); 1.107 + 1.108 + ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceMirrorKlass_OOP_OOP_ITERATE_BACKWARDS_DECL) 1.109 + ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceMirrorKlass_OOP_OOP_ITERATE_BACKWARDS_DECL) 1.110 +#endif // !SERIALGC 1.111 +}; 1.112 + 1.113 +#endif // SHARE_VM_OOPS_INSTANCEMIRRORKLASS_HPP