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src/share/vm/oops/instanceMirrorKlass.hpp@f90c822e73f8 (annotated)

src/share/vm/oops/instanceMirrorKlass.hpp

Wed, 27 Apr 2016 01:25:04 +0800

author

aoqi

date

Wed, 27 Apr 2016 01:25:04 +0800

changeset 0

f90c822e73f8

child 6876

710a3c8b516e

permissions

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Initial load
http://hg.openjdk.java.net/jdk8u/jdk8u/hotspot/
changeset: 6782:28b50d07f6f8
tag: jdk8u25-b17

aoqi@0	1	/*
aoqi@0	2	* Copyright (c) 2011, 2013, Oracle and/or its affiliates. All rights reserved.
aoqi@0	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0	4	*
aoqi@0	5	* This code is free software; you can redistribute it and/or modify it
aoqi@0	6	* under the terms of the GNU General Public License version 2 only, as
aoqi@0	7	* published by the Free Software Foundation.
aoqi@0	8	*
aoqi@0	9	* This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
aoqi@0	12	* version 2 for more details (a copy is included in the LICENSE file that
aoqi@0	13	* accompanied this code).
aoqi@0	14	*
aoqi@0	15	* You should have received a copy of the GNU General Public License version
aoqi@0	16	* 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0	18	*
aoqi@0	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0	20	* or visit www.oracle.com if you need additional information or have any
aoqi@0	21	* questions.
aoqi@0	22	*
aoqi@0	23	*/
aoqi@0	24
aoqi@0	25	#ifndef SHARE_VM_OOPS_INSTANCEMIRRORKLASS_HPP
aoqi@0	26	#define SHARE_VM_OOPS_INSTANCEMIRRORKLASS_HPP
aoqi@0	27
aoqi@0	28	#include "classfile/systemDictionary.hpp"
aoqi@0	29	#include "oops/instanceKlass.hpp"
aoqi@0	30	#include "runtime/handles.hpp"
aoqi@0	31	#include "utilities/macros.hpp"
aoqi@0	32
aoqi@0	33	// An InstanceMirrorKlass is a specialized InstanceKlass for
aoqi@0	34	// java.lang.Class instances. These instances are special because
aoqi@0	35	// they contain the static fields of the class in addition to the
aoqi@0	36	// normal fields of Class. This means they are variable sized
aoqi@0	37	// instances and need special logic for computing their size and for
aoqi@0	38	// iteration of their oops.
aoqi@0	39
aoqi@0	40
aoqi@0	41	class InstanceMirrorKlass: public InstanceKlass {
aoqi@0	42	friend class VMStructs;
aoqi@0	43	friend class InstanceKlass;
aoqi@0	44
aoqi@0	45	private:
aoqi@0	46	static int _offset_of_static_fields;
aoqi@0	47
aoqi@0	48	// Constructor
aoqi@0	49	InstanceMirrorKlass(int vtable_len, int itable_len, int static_field_size, int nonstatic_oop_map_size, ReferenceType rt, AccessFlags access_flags, bool is_anonymous)
aoqi@0	50	: InstanceKlass(vtable_len, itable_len, static_field_size, nonstatic_oop_map_size, rt, access_flags, is_anonymous) {}
aoqi@0	51
aoqi@0	52	public:
aoqi@0	53	InstanceMirrorKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); }
aoqi@0	54	// Type testing
aoqi@0	55	bool oop_is_instanceMirror() const { return true; }
aoqi@0	56
aoqi@0	57	// Casting from Klass*
aoqi@0	58	static InstanceMirrorKlass* cast(Klass* k) {
aoqi@0	59	assert(k->oop_is_instanceMirror(), "cast to InstanceMirrorKlass");
aoqi@0	60	return (InstanceMirrorKlass*) k;
aoqi@0	61	}
aoqi@0	62
aoqi@0	63	// Returns the size of the instance including the extra static fields.
aoqi@0	64	virtual int oop_size(oop obj) const;
aoqi@0	65
aoqi@0	66	// Static field offset is an offset into the Heap, should be converted by
aoqi@0	67	// based on UseCompressedOop for traversal
aoqi@0	68	static HeapWord* start_of_static_fields(oop obj) {
aoqi@0	69	return (HeapWord*)(cast_from_oop<intptr_t>(obj) + offset_of_static_fields());
aoqi@0	70	}
aoqi@0	71
aoqi@0	72	static void init_offset_of_static_fields() {
aoqi@0	73	// Cache the offset of the static fields in the Class instance
aoqi@0	74	assert(_offset_of_static_fields == 0, "once");
aoqi@0	75	_offset_of_static_fields = InstanceMirrorKlass::cast(SystemDictionary::Class_klass())->size_helper() << LogHeapWordSize;
aoqi@0	76	}
aoqi@0	77
aoqi@0	78	static int offset_of_static_fields() {
aoqi@0	79	return _offset_of_static_fields;
aoqi@0	80	}
aoqi@0	81
aoqi@0	82	int compute_static_oop_field_count(oop obj);
aoqi@0	83
aoqi@0	84	// Given a Klass return the size of the instance
aoqi@0	85	int instance_size(KlassHandle k);
aoqi@0	86
aoqi@0	87	// allocation
aoqi@0	88	instanceOop allocate_instance(KlassHandle k, TRAPS);
aoqi@0	89
aoqi@0	90	// Garbage collection
aoqi@0	91	int oop_adjust_pointers(oop obj);
aoqi@0	92	void oop_follow_contents(oop obj);
aoqi@0	93
aoqi@0	94	// Parallel Scavenge and Parallel Old
aoqi@0	95	PARALLEL_GC_DECLS
aoqi@0	96
aoqi@0	97	int oop_oop_iterate(oop obj, ExtendedOopClosure* blk) {
aoqi@0	98	return oop_oop_iterate_v(obj, blk);
aoqi@0	99	}
aoqi@0	100	int oop_oop_iterate_m(oop obj, ExtendedOopClosure* blk, MemRegion mr) {
aoqi@0	101	return oop_oop_iterate_v_m(obj, blk, mr);
aoqi@0	102	}
aoqi@0	103
aoqi@0	104	#define InstanceMirrorKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \
aoqi@0	105	int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk); \
aoqi@0	106	int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, MemRegion mr);
aoqi@0	107
aoqi@0	108	ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceMirrorKlass_OOP_OOP_ITERATE_DECL)
aoqi@0	109	ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceMirrorKlass_OOP_OOP_ITERATE_DECL)
aoqi@0	110
aoqi@0	111	#if INCLUDE_ALL_GCS
aoqi@0	112	#define InstanceMirrorKlass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \
aoqi@0	113	int oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* blk);
aoqi@0	114
aoqi@0	115	ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceMirrorKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
aoqi@0	116	ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceMirrorKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
aoqi@0	117	#endif // INCLUDE_ALL_GCS
aoqi@0	118	};
aoqi@0	119
aoqi@0	120	#endif // SHARE_VM_OOPS_INSTANCEMIRRORKLASS_HPP