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src/share/vm/ci/ciKlass.hpp@2c6ef90f030a (annotated)

src/share/vm/ci/ciKlass.hpp

Mon, 07 Jul 2014 10:12:40 +0200

author

stefank

date

Mon, 07 Jul 2014 10:12:40 +0200

changeset 6992

2c6ef90f030a

parent 6198

55fb97c4c58d

child 7535

7ae4e26cb1e0

permissions

-rw-r--r--

8049421: G1 Class Unloading after completing a concurrent mark cycle
Reviewed-by: tschatzl, ehelin, brutisso, coleenp, roland, iveresov
Contributed-by: stefan.karlsson@oracle.com, mikael.gerdin@oracle.com

duke@435	1	/*
mikael@6198	2	* Copyright (c) 1999, 2013, 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_CI_CIKLASS_HPP
stefank@2314	26	#define SHARE_VM_CI_CIKLASS_HPP
stefank@2314	27
stefank@2314	28	#include "ci/ciType.hpp"
stefank@2314	29
duke@435	30	// ciKlass
duke@435	31	//
coleenp@4037	32	// This class and its subclasses represent Klass*s in the
coleenp@4037	33	// HotSpot virtual machine. In the vm, each Klass* contains an
duke@435	34	// embedded Klass object. ciKlass is subclassed to explicitly
coleenp@4037	35	// represent the kind of Klass embedded in the Klass*. For
coleenp@4142	36	// example, a Klass* with an embedded ObjArrayKlass object is
duke@435	37	// represented in the ciObject hierarchy by the class
duke@435	38	// ciObjArrayKlass.
duke@435	39	class ciKlass : public ciType {
duke@435	40	CI_PACKAGE_ACCESS
duke@435	41	friend class ciEnv;
duke@435	42	friend class ciField;
duke@435	43	friend class ciMethod;
roland@5914	44	friend class ciMethodData;
duke@435	45	friend class ciObjArrayKlass;
stefank@6992	46	friend class ciReceiverTypeData;
duke@435	47
duke@435	48	private:
duke@435	49	ciSymbol* _name;
duke@435	50	jint _layout_helper;
duke@435	51
duke@435	52	protected:
duke@435	53	ciKlass(KlassHandle k_h, ciSymbol* name);
coleenp@4037	54	ciKlass(ciSymbol* name, BasicType bt);
duke@435	55
coleenp@4037	56	Klass* get_Klass() const {
coleenp@4037	57	Klass* k = (Klass*)_metadata;
duke@435	58	assert(k != NULL, "illegal use of unloaded klass");
duke@435	59	return k;
duke@435	60	}
duke@435	61
duke@435	62	// Certain subklasses have an associated class loader.
duke@435	63	virtual oop loader() { return NULL; }
duke@435	64	virtual jobject loader_handle() { return NULL; }
duke@435	65
duke@435	66	virtual oop protection_domain() { return NULL; }
duke@435	67	virtual jobject protection_domain_handle() { return NULL; }
duke@435	68
duke@435	69	const char* type_string() { return "ciKlass"; }
duke@435	70
duke@435	71	void print_impl(outputStream* st);
duke@435	72
duke@435	73	public:
duke@435	74	ciKlass(KlassHandle k_h);
duke@435	75
duke@435	76	// What is the name of this klass?
twisti@1573	77	ciSymbol* name() const { return _name; }
duke@435	78
duke@435	79	// What is its layout helper value?
duke@435	80	jint layout_helper() { return _layout_helper; }
duke@435	81
duke@435	82	bool is_subtype_of(ciKlass* klass);
duke@435	83	bool is_subclass_of(ciKlass* klass);
duke@435	84	juint super_depth();
duke@435	85	juint super_check_offset();
duke@435	86	ciKlass* super_of_depth(juint i);
duke@435	87	bool can_be_primary_super();
duke@435	88	static juint primary_super_limit() { return Klass::primary_super_limit(); }
duke@435	89
coleenp@4037	90	// Is this ciObject the ciInstanceKlass representing java.lang.Object()?
coleenp@4037	91	virtual bool is_java_lang_Object() const { return false; }
coleenp@4037	92
duke@435	93	// Get the shared parent of two klasses.
duke@435	94	ciKlass* least_common_ancestor(ciKlass* k);
duke@435	95
duke@435	96	virtual bool is_interface() {
duke@435	97	return false;
duke@435	98	}
duke@435	99
duke@435	100	virtual bool is_abstract() {
duke@435	101	return false;
duke@435	102	}
duke@435	103
duke@435	104	// Does this type (array, class, interface) have no subtypes?
duke@435	105	virtual bool is_leaf_type() {
duke@435	106	return false;
duke@435	107	}
duke@435	108
duke@435	109	// Attempt to get a klass using this ciKlass's loader.
duke@435	110	ciKlass* find_klass(ciSymbol* klass_name);
duke@435	111	// Note: To find a class from its name string, use ciSymbol::make,
duke@435	112	// but consider adding to vmSymbols.hpp instead.
duke@435	113
duke@435	114	// Get the instance of java.lang.Class corresponding to this klass.
duke@435	115	ciInstance* java_mirror();
duke@435	116
duke@435	117	// Fetch Klass::modifier_flags.
duke@435	118	jint modifier_flags();
duke@435	119
duke@435	120	// Fetch Klass::access_flags.
duke@435	121	jint access_flags();
duke@435	122
duke@435	123	// What kind of ciObject is this?
coleenp@4037	124	bool is_klass() const { return true; }
duke@435	125
roland@5914	126	virtual ciKlass* exact_klass() = 0;
roland@5914	127
duke@435	128	void print_name_on(outputStream* st);
duke@435	129	};
stefank@2314	130
stefank@2314	131	#endif // SHARE_VM_CI_CIKLASS_HPP