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src/share/vm/memory/generationSpec.hpp@8ce625481709 (annotated)

src/share/vm/memory/generationSpec.hpp

Fri, 15 Apr 2011 09:36:28 -0400

author

coleenp

date

Fri, 15 Apr 2011 09:36:28 -0400

changeset 2777

8ce625481709

parent 2314

f95d63e2154a

child 3900

d2a62e0f25eb

permissions

-rw-r--r--

7032407: Crash in LinkResolver::runtime_resolve_virtual_method()
Summary: Make CDS reorder vtables so that dump time vtables match run time order, so when redefine classes reinitializes them, they aren't in the wrong order.
Reviewed-by: dcubed, acorn

duke@435	1	/*
stefank@2314	2	* Copyright (c) 2001, 2010, 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_MEMORY_GENERATIONSPEC_HPP
stefank@2314	26	#define SHARE_VM_MEMORY_GENERATIONSPEC_HPP
stefank@2314	27
stefank@2314	28	#include "memory/generation.hpp"
stefank@2314	29	#include "memory/permGen.hpp"
stefank@2314	30
duke@435	31	// The specification of a generation. This class also encapsulates
duke@435	32	// some generation-specific behavior. This is done here rather than as a
duke@435	33	// virtual function of Generation because these methods are needed in
duke@435	34	// initialization of the Generations.
duke@435	35	class GenerationSpec : public CHeapObj {
duke@435	36	friend class VMStructs;
duke@435	37	private:
duke@435	38	Generation::Name _name;
duke@435	39	size_t _init_size;
duke@435	40	size_t _max_size;
duke@435	41
duke@435	42	public:
duke@435	43	GenerationSpec(Generation::Name name, size_t init_size, size_t max_size) {
duke@435	44	_name = name;
duke@435	45	_init_size = init_size;
duke@435	46	_max_size = max_size;
duke@435	47	}
duke@435	48
duke@435	49	Generation* init(ReservedSpace rs, int level, GenRemSet* remset);
duke@435	50
duke@435	51	// Accessors
duke@435	52	Generation::Name name() const { return _name; }
duke@435	53	size_t init_size() const { return _init_size; }
duke@435	54	void set_init_size(size_t size) { _init_size = size; }
duke@435	55	size_t max_size() const { return _max_size; }
duke@435	56	void set_max_size(size_t size) { _max_size = size; }
duke@435	57
duke@435	58	// Alignment
duke@435	59	void align(size_t alignment) {
duke@435	60	set_init_size(align_size_up(init_size(), alignment));
duke@435	61	set_max_size(align_size_up(max_size(), alignment));
duke@435	62	}
duke@435	63
duke@435	64	// Return the number of regions contained in the generation which
duke@435	65	// might need to be independently covered by a remembered set.
duke@435	66	virtual int n_covered_regions() const { return 1; }
duke@435	67	};
duke@435	68
duke@435	69	typedef GenerationSpec* GenerationSpecPtr;
duke@435	70
duke@435	71	// The specification of a permanent generation. This class is very
duke@435	72	// similar to GenerationSpec in use. Due to PermGen's not being a
duke@435	73	// true Generation, we cannot combine the spec classes either.
duke@435	74	class PermanentGenerationSpec : public CHeapObj {
duke@435	75	friend class VMStructs;
duke@435	76	private:
duke@435	77	PermGen::Name _name;
duke@435	78	size_t _init_size;
duke@435	79	size_t _max_size;
duke@435	80	size_t _read_only_size;
duke@435	81	size_t _read_write_size;
duke@435	82	size_t _misc_data_size;
duke@435	83	size_t _misc_code_size;
duke@435	84	bool _enable_shared_spaces;
duke@435	85
duke@435	86	enum {
duke@435	87	_n_spaces = 2
duke@435	88	};
duke@435	89
duke@435	90	public:
duke@435	91	PermanentGenerationSpec(PermGen::Name name, size_t init_size,
duke@435	92	size_t max_size, size_t read_only_size,
duke@435	93	size_t read_write_size, size_t misc_data_size,
duke@435	94	size_t misc_code_size);
duke@435	95
duke@435	96	PermGen* init(ReservedSpace rs, size_t init_size, GenRemSet* remset);
duke@435	97
duke@435	98	void disable_sharing() {
duke@435	99	_enable_shared_spaces = false;
duke@435	100	_read_only_size = 0;
duke@435	101	_read_write_size = 0;
duke@435	102	_misc_data_size = 0;
duke@435	103	_misc_code_size = 0;
duke@435	104	}
duke@435	105
duke@435	106	// Accessors
duke@435	107	PermGen::Name name() const { return _name; }
duke@435	108	size_t init_size() const { return _init_size; }
duke@435	109	void set_init_size(size_t size) { _init_size = size; }
duke@435	110
duke@435	111	// Max size for user DOES NOT include shared spaces.
duke@435	112	// Max size for space allocation DOES include shared spaces.
duke@435	113	size_t max_size() const {
duke@435	114	return _max_size + _read_only_size + _read_write_size;
duke@435	115	}
duke@435	116
duke@435	117	// Need one covered region for the main space, and one for the shared
duke@435	118	// spaces (together).
duke@435	119	int n_covered_regions() const { return 2; }
duke@435	120
duke@435	121	void align(size_t alignment);
duke@435	122
duke@435	123	size_t read_only_size() const { return _read_only_size; }
duke@435	124	size_t read_write_size() const { return _read_write_size; }
duke@435	125	size_t misc_data_size() const { return _misc_data_size; }
duke@435	126	size_t misc_code_size() const { return _misc_code_size; }
duke@435	127	bool enable_shared_spaces() const { return _enable_shared_spaces; }
duke@435	128	};
stefank@2314	129
stefank@2314	130	#endif // SHARE_VM_MEMORY_GENERATIONSPEC_HPP