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src/share/vm/oops/instanceMirrorKlass.hpp@63997f575155 (annotated)

src/share/vm/oops/instanceMirrorKlass.hpp

Wed, 30 Mar 2011 07:47:19 -0700

author

never

date

Wed, 30 Mar 2011 07:47:19 -0700

changeset 2693

63997f575155

parent 2658

c7f3d0b4570f

child 4037

da91efe96a93

permissions

-rw-r--r--

7031614: jmap -permstat fails with java.lang.InternalError in sun.jvm.hotspot.oops.OopField.getValue
Reviewed-by: kvn, dcubed

never@2658	1	/*
never@2658	2	* Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
never@2658	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
never@2658	4	*
never@2658	5	* This code is free software; you can redistribute it and/or modify it
never@2658	6	* under the terms of the GNU General Public License version 2 only, as
never@2658	7	* published by the Free Software Foundation.
never@2658	8	*
never@2658	9	* This code is distributed in the hope that it will be useful, but WITHOUT
never@2658	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
never@2658	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
never@2658	12	* version 2 for more details (a copy is included in the LICENSE file that
never@2658	13	* accompanied this code).
never@2658	14	*
never@2658	15	* You should have received a copy of the GNU General Public License version
never@2658	16	* 2 along with this work; if not, write to the Free Software Foundation,
never@2658	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
never@2658	18	*
never@2658	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
never@2658	20	* or visit www.oracle.com if you need additional information or have any
never@2658	21	* questions.
never@2658	22	*
never@2658	23	*/
never@2658	24
never@2658	25	#ifndef SHARE_VM_OOPS_INSTANCEMIRRORKLASS_HPP
never@2658	26	#define SHARE_VM_OOPS_INSTANCEMIRRORKLASS_HPP
never@2658	27
never@2658	28	#include "oops/instanceKlass.hpp"
never@2658	29
never@2658	30	// An instanceMirrorKlass is a specialized instanceKlass for
never@2658	31	// java.lang.Class instances. These instances are special because
never@2658	32	// they contain the static fields of the class in addition to the
never@2658	33	// normal fields of Class. This means they are variable sized
never@2658	34	// instances and need special logic for computing their size and for
never@2658	35	// iteration of their oops.
never@2658	36
never@2658	37
never@2658	38	class instanceMirrorKlass: public instanceKlass {
never@2693	39	friend class VMStructs;
never@2693	40
never@2658	41	private:
never@2658	42	static int _offset_of_static_fields;
never@2658	43
never@2658	44	public:
never@2658	45	// Type testing
never@2658	46	bool oop_is_instanceMirror() const { return true; }
never@2658	47
never@2658	48	// Casting from klassOop
never@2658	49	static instanceMirrorKlass* cast(klassOop k) {
never@2658	50	assert(k->klass_part()->oop_is_instanceMirror(), "cast to instanceMirrorKlass");
never@2658	51	return (instanceMirrorKlass*) k->klass_part();
never@2658	52	}
never@2658	53
never@2658	54	// Returns the size of the instance including the extra static fields.
never@2658	55	virtual int oop_size(oop obj) const;
never@2658	56
never@2658	57	// Static field offset is an offset into the Heap, should be converted by
never@2658	58	// based on UseCompressedOop for traversal
never@2658	59	static HeapWord* start_of_static_fields(oop obj) {
never@2658	60	return (HeapWord*)((intptr_t)obj + offset_of_static_fields());
never@2658	61	}
never@2658	62
never@2658	63	static void init_offset_of_static_fields() {
never@2658	64	// Cache the offset of the static fields in the Class instance
never@2658	65	assert(_offset_of_static_fields == 0, "once");
never@2658	66	_offset_of_static_fields = instanceMirrorKlass::cast(SystemDictionary::Class_klass())->size_helper() << LogHeapWordSize;
never@2658	67	}
never@2658	68
never@2658	69	static int offset_of_static_fields() {
never@2658	70	return _offset_of_static_fields;
never@2658	71	}
never@2658	72
never@2658	73	int compute_static_oop_field_count(oop obj);
never@2658	74
never@2658	75	// Given a Klass return the size of the instance
never@2658	76	int instance_size(KlassHandle k);
never@2658	77
never@2658	78	// allocation
never@2658	79	DEFINE_ALLOCATE_PERMANENT(instanceMirrorKlass);
never@2658	80	instanceOop allocate_instance(KlassHandle k, TRAPS);
never@2658	81
never@2658	82	// Garbage collection
never@2658	83	int oop_adjust_pointers(oop obj);
never@2658	84	void oop_follow_contents(oop obj);
never@2658	85
never@2658	86	// Parallel Scavenge and Parallel Old
never@2658	87	PARALLEL_GC_DECLS
never@2658	88
never@2658	89	int oop_oop_iterate(oop obj, OopClosure* blk) {
never@2658	90	return oop_oop_iterate_v(obj, blk);
never@2658	91	}
never@2658	92	int oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr) {
never@2658	93	return oop_oop_iterate_v_m(obj, blk, mr);
never@2658	94	}
never@2658	95
never@2658	96	#define InstanceMirrorKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \
never@2658	97	int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk); \
never@2658	98	int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, MemRegion mr);
never@2658	99
never@2658	100	ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceMirrorKlass_OOP_OOP_ITERATE_DECL)
never@2658	101	ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceMirrorKlass_OOP_OOP_ITERATE_DECL)
never@2658	102
never@2658	103	#ifndef SERIALGC
never@2658	104	#define InstanceMirrorKlass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \
never@2658	105	int oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* blk);
never@2658	106
never@2658	107	ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceMirrorKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
never@2658	108	ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceMirrorKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
never@2658	109	#endif // !SERIALGC
never@2658	110	};
never@2658	111
never@2658	112	#endif // SHARE_VM_OOPS_INSTANCEMIRRORKLASS_HPP