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src/share/vm/gc_implementation/parallelScavenge/psVirtualspace.hpp@710a3c8b516e (annotated)

src/share/vm/gc_implementation/parallelScavenge/psVirtualspace.hpp

Tue, 08 Aug 2017 15:57:29 +0800

author

aoqi

date

Tue, 08 Aug 2017 15:57:29 +0800

changeset 6876

710a3c8b516e

parent 4153

b9a9ed0f8eeb

parent 0

f90c822e73f8

permissions

-rw-r--r--

merge

aoqi@0	1	/*
aoqi@0	2	* Copyright (c) 2003, 2012, 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_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSVIRTUALSPACE_HPP
aoqi@0	26	#define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSVIRTUALSPACE_HPP
aoqi@0	27
aoqi@0	28	#include "runtime/virtualspace.hpp"
aoqi@0	29
aoqi@0	30	// VirtualSpace for the parallel scavenge collector.
aoqi@0	31	//
aoqi@0	32	// VirtualSpace is data structure for committing a previously reserved address
aoqi@0	33	// range in smaller chunks.
aoqi@0	34
aoqi@0	35	class PSVirtualSpace : public CHeapObj<mtGC> {
aoqi@0	36	friend class VMStructs;
aoqi@0	37	protected:
aoqi@0	38	// The space is committed/uncommited in chunks of size _alignment. The
aoqi@0	39	// ReservedSpace passed to initialize() must be aligned to this value.
aoqi@0	40	const size_t _alignment;
aoqi@0	41
aoqi@0	42	// Reserved area
aoqi@0	43	char* _reserved_low_addr;
aoqi@0	44	char* _reserved_high_addr;
aoqi@0	45
aoqi@0	46	// Committed area
aoqi@0	47	char* _committed_low_addr;
aoqi@0	48	char* _committed_high_addr;
aoqi@0	49
aoqi@0	50	// The entire space has been committed and pinned in memory, no
aoqi@0	51	// os::commit_memory() or os::uncommit_memory().
aoqi@0	52	bool _special;
aoqi@0	53
aoqi@0	54	// Convenience wrapper.
aoqi@0	55	inline static size_t pointer_delta(const char* left, const char* right);
aoqi@0	56
aoqi@0	57	public:
aoqi@0	58	PSVirtualSpace(ReservedSpace rs, size_t alignment);
aoqi@0	59	PSVirtualSpace(ReservedSpace rs);
aoqi@0	60
aoqi@0	61	~PSVirtualSpace();
aoqi@0	62
aoqi@0	63	// Eventually all instances should be created with the above 1- or 2-arg
aoqi@0	64	// constructors. Then the 1st constructor below should become protected and
aoqi@0	65	// the 2nd ctor and initialize() removed.
aoqi@0	66	PSVirtualSpace(size_t alignment): _alignment(alignment) { }
aoqi@0	67	PSVirtualSpace();
aoqi@0	68	bool initialize(ReservedSpace rs, size_t commit_size);
aoqi@0	69
aoqi@0	70	bool contains(void* p) const;
aoqi@0	71
aoqi@0	72	// Accessors (all sizes are bytes).
aoqi@0	73	size_t alignment() const { return _alignment; }
aoqi@0	74	char* reserved_low_addr() const { return _reserved_low_addr; }
aoqi@0	75	char* reserved_high_addr() const { return _reserved_high_addr; }
aoqi@0	76	char* committed_low_addr() const { return _committed_low_addr; }
aoqi@0	77	char* committed_high_addr() const { return _committed_high_addr; }
aoqi@0	78	bool special() const { return _special; }
aoqi@0	79
aoqi@0	80	inline size_t committed_size() const;
aoqi@0	81	inline size_t reserved_size() const;
aoqi@0	82	inline size_t uncommitted_size() const;
aoqi@0	83
aoqi@0	84	// Operations.
aoqi@0	85	inline void set_reserved(char* low_addr, char* high_addr, bool special);
aoqi@0	86	inline void set_reserved(ReservedSpace rs);
aoqi@0	87	inline void set_committed(char* low_addr, char* high_addr);
aoqi@0	88	virtual bool expand_by(size_t bytes);
aoqi@0	89	virtual bool shrink_by(size_t bytes);
aoqi@0	90	virtual size_t expand_into(PSVirtualSpace* space, size_t bytes);
aoqi@0	91	void release();
aoqi@0	92
aoqi@0	93	#ifndef PRODUCT
aoqi@0	94	// Debugging
aoqi@0	95	static bool is_aligned(size_t val, size_t align);
aoqi@0	96	bool is_aligned(size_t val) const;
aoqi@0	97	bool is_aligned(char* val) const;
aoqi@0	98	void verify() const;
aoqi@0	99	void print() const;
aoqi@0	100	virtual bool grows_up() const { return true; }
aoqi@0	101	bool grows_down() const { return !grows_up(); }
aoqi@0	102
aoqi@0	103	// Helper class to verify a space when entering/leaving a block.
aoqi@0	104	class PSVirtualSpaceVerifier: public StackObj {
aoqi@0	105	private:
aoqi@0	106	const PSVirtualSpace* const _space;
aoqi@0	107	public:
aoqi@0	108	PSVirtualSpaceVerifier(PSVirtualSpace* space): _space(space) {
aoqi@0	109	_space->verify();
aoqi@0	110	}
aoqi@0	111	~PSVirtualSpaceVerifier() { _space->verify(); }
aoqi@0	112	};
aoqi@0	113	#endif
aoqi@0	114
aoqi@0	115	virtual void print_space_boundaries_on(outputStream* st) const;
aoqi@0	116
aoqi@0	117	// Included for compatibility with the original VirtualSpace.
aoqi@0	118	public:
aoqi@0	119	// Committed area
aoqi@0	120	char* low() const { return committed_low_addr(); }
aoqi@0	121	char* high() const { return committed_high_addr(); }
aoqi@0	122
aoqi@0	123	// Reserved area
aoqi@0	124	char* low_boundary() const { return reserved_low_addr(); }
aoqi@0	125	char* high_boundary() const { return reserved_high_addr(); }
aoqi@0	126	};
aoqi@0	127
aoqi@0	128	// A virtual space that grows from high addresses to low addresses.
aoqi@0	129	class PSVirtualSpaceHighToLow : public PSVirtualSpace {
aoqi@0	130	friend class VMStructs;
aoqi@0	131	public:
aoqi@0	132	PSVirtualSpaceHighToLow(ReservedSpace rs, size_t alignment);
aoqi@0	133	PSVirtualSpaceHighToLow(ReservedSpace rs);
aoqi@0	134
aoqi@0	135	virtual bool expand_by(size_t bytes);
aoqi@0	136	virtual bool shrink_by(size_t bytes);
aoqi@0	137	virtual size_t expand_into(PSVirtualSpace* space, size_t bytes);
aoqi@0	138
aoqi@0	139	virtual void print_space_boundaries_on(outputStream* st) const;
aoqi@0	140
aoqi@0	141	#ifndef PRODUCT
aoqi@0	142	// Debugging
aoqi@0	143	virtual bool grows_up() const { return false; }
aoqi@0	144	#endif
aoqi@0	145	};
aoqi@0	146
aoqi@0	147	//
aoqi@0	148	// PSVirtualSpace inlines.
aoqi@0	149	//
aoqi@0	150	inline size_t
aoqi@0	151	PSVirtualSpace::pointer_delta(const char* left, const char* right) {
aoqi@0	152	return ::pointer_delta((void *)left, (void*)right, sizeof(char));
aoqi@0	153	}
aoqi@0	154
aoqi@0	155	inline size_t PSVirtualSpace::committed_size() const {
aoqi@0	156	return pointer_delta(committed_high_addr(), committed_low_addr());
aoqi@0	157	}
aoqi@0	158
aoqi@0	159	inline size_t PSVirtualSpace::reserved_size() const {
aoqi@0	160	return pointer_delta(reserved_high_addr(), reserved_low_addr());
aoqi@0	161	}
aoqi@0	162
aoqi@0	163	inline size_t PSVirtualSpace::uncommitted_size() const {
aoqi@0	164	return reserved_size() - committed_size();
aoqi@0	165	}
aoqi@0	166
aoqi@0	167	inline void PSVirtualSpace::set_reserved(char* low_addr, char* high_addr, bool special) {
aoqi@0	168	_reserved_low_addr = low_addr;
aoqi@0	169	_reserved_high_addr = high_addr;
aoqi@0	170	_special = special;
aoqi@0	171	}
aoqi@0	172
aoqi@0	173	inline void PSVirtualSpace::set_reserved(ReservedSpace rs) {
aoqi@0	174	set_reserved(rs.base(), rs.base() + rs.size(), rs.special());
aoqi@0	175	}
aoqi@0	176
aoqi@0	177	inline void PSVirtualSpace::set_committed(char* low_addr, char* high_addr) {
aoqi@0	178	_committed_low_addr = low_addr;
aoqi@0	179	_committed_high_addr = high_addr;
aoqi@0	180	}
aoqi@0	181
aoqi@0	182	#endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSVIRTUALSPACE_HPP