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src/share/vm/runtime/fieldDescriptor.hpp@da91efe96a93 (annotated)

src/share/vm/runtime/fieldDescriptor.hpp

Sat, 01 Sep 2012 13:25:18 -0400

author

coleenp

date

Sat, 01 Sep 2012 13:25:18 -0400

changeset 4037

da91efe96a93

parent 3969

1d7922586cf6

child 4251

18fb7da42534

permissions

-rw-r--r--

6964458: Reimplement class meta-data storage to use native memory
Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes
Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland
Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>

duke@435	1	/*
coleenp@4037	2	* Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
duke@435	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435	4	*
duke@435	5	* This code is free software; you can redistribute it and/or modify it
duke@435	6	* under the terms of the GNU General Public License version 2 only, as
duke@435	7	* published by the Free Software Foundation.
duke@435	8	*
duke@435	9	* This code is distributed in the hope that it will be useful, but WITHOUT
duke@435	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
duke@435	12	* version 2 for more details (a copy is included in the LICENSE file that
duke@435	13	* accompanied this code).
duke@435	14	*
duke@435	15	* You should have received a copy of the GNU General Public License version
duke@435	16	* 2 along with this work; if not, write to the Free Software Foundation,
duke@435	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435	18	*
trims@1907	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907	20	* or visit www.oracle.com if you need additional information or have any
trims@1907	21	* questions.
duke@435	22	*
duke@435	23	*/
duke@435	24
stefank@2314	25	#ifndef SHARE_VM_RUNTIME_FIELDDESCRIPTOR_HPP
stefank@2314	26	#define SHARE_VM_RUNTIME_FIELDDESCRIPTOR_HPP
stefank@2314	27
coleenp@4037	28	#include "oops/constantPool.hpp"
coleenp@2497	29	#include "oops/symbol.hpp"
stefank@2314	30	#include "runtime/fieldType.hpp"
stefank@2314	31	#include "utilities/accessFlags.hpp"
stefank@2314	32	#include "utilities/constantTag.hpp"
stefank@2314	33
duke@435	34	// A fieldDescriptor describes the attributes of a single field (instance or class variable).
duke@435	35	// It needs the class constant pool to work (because it only holds indices into the pool
duke@435	36	// rather than the actual info).
duke@435	37
duke@435	38	class fieldDescriptor VALUE_OBJ_CLASS_SPEC {
duke@435	39	private:
duke@435	40	AccessFlags _access_flags;
never@3137	41	int _index; // the field index
duke@435	42	constantPoolHandle _cp;
duke@435	43
never@3137	44	// update the access_flags for the field in the klass
never@3137	45	void update_klass_field_access_flag() {
coleenp@4037	46	InstanceKlass* ik = InstanceKlass::cast(field_holder());
never@3137	47	ik->field(index())->set_access_flags(_access_flags.as_short());
never@3137	48	}
never@3137	49
never@3137	50	FieldInfo* field() const {
coleenp@4037	51	InstanceKlass* ik = InstanceKlass::cast(field_holder());
never@3137	52	return ik->field(_index);
never@3137	53	}
never@3137	54
duke@435	55	public:
never@3137	56	Symbol* name() const {
never@3137	57	return field()->name(_cp);
never@3137	58	}
never@3137	59	Symbol* signature() const {
never@3137	60	return field()->signature(_cp);
never@3137	61	}
coleenp@4037	62	Klass* field_holder() const { return _cp->pool_holder(); }
coleenp@4037	63	ConstantPool* constants() const { return _cp(); }
duke@435	64	AccessFlags access_flags() const { return _access_flags; }
duke@435	65	oop loader() const;
coleenp@4037	66	// Offset (in words) of field from start of instanceOop / Klass*
never@3137	67	int offset() const { return field()->offset(); }
jiangli@3803	68	Symbol* generic_signature() const;
duke@435	69	int index() const { return _index; }
coleenp@4037	70	AnnotationArray* annotations() const;
duke@435	71
duke@435	72	// Initial field value
never@3137	73	bool has_initial_value() const { return field()->initval_index() != 0; }
never@3137	74	int initial_value_index() const { return field()->initval_index(); }
duke@435	75	constantTag initial_value_tag() const; // The tag will return true on one of is_int(), is_long(), is_single(), is_double()
duke@435	76	jint int_initial_value() const;
duke@435	77	jlong long_initial_value() const;
duke@435	78	jfloat float_initial_value() const;
duke@435	79	jdouble double_initial_value() const;
duke@435	80	oop string_initial_value(TRAPS) const;
duke@435	81
duke@435	82	// Field signature type
duke@435	83	BasicType field_type() const { return FieldType::basic_type(signature()); }
duke@435	84
duke@435	85	// Access flags
never@3137	86	bool is_public() const { return access_flags().is_public(); }
never@3137	87	bool is_private() const { return access_flags().is_private(); }
never@3137	88	bool is_protected() const { return access_flags().is_protected(); }
duke@435	89	bool is_package_private() const { return !is_public() && !is_private() && !is_protected(); }
duke@435	90
never@3137	91	bool is_static() const { return access_flags().is_static(); }
never@3137	92	bool is_final() const { return access_flags().is_final(); }
never@3137	93	bool is_volatile() const { return access_flags().is_volatile(); }
never@3137	94	bool is_transient() const { return access_flags().is_transient(); }
duke@435	95
never@3137	96	bool is_synthetic() const { return access_flags().is_synthetic(); }
duke@435	97
never@3137	98	bool is_field_access_watched() const { return access_flags().is_field_access_watched(); }
duke@435	99	bool is_field_modification_watched() const
never@3137	100	{ return access_flags().is_field_modification_watched(); }
jiangli@3879	101	bool has_generic_signature() const { return access_flags().field_has_generic_signature(); }
never@3137	102
never@3137	103	void set_is_field_access_watched(const bool value) {
never@3137	104	_access_flags.set_is_field_access_watched(value);
never@3137	105	update_klass_field_access_flag();
never@3137	106	}
never@3137	107
never@3137	108	void set_is_field_modification_watched(const bool value) {
never@3137	109	_access_flags.set_is_field_modification_watched(value);
never@3137	110	update_klass_field_access_flag();
never@3137	111	}
duke@435	112
duke@435	113	// Initialization
coleenp@4037	114	void initialize(InstanceKlass* ik, int index);
duke@435	115
duke@435	116	// Print
twisti@3969	117	void print() { print_on(tty); }
duke@435	118	void print_on(outputStream* st) const PRODUCT_RETURN;
duke@435	119	void print_on_for(outputStream* st, oop obj) PRODUCT_RETURN;
duke@435	120	};
stefank@2314	121
stefank@2314	122	#endif // SHARE_VM_RUNTIME_FIELDDESCRIPTOR_HPP