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src/share/vm/gc_implementation/parallelScavenge/psPromotionLAB.hpp@fb69749583e8 (annotated)

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

Thu, 09 Apr 2015 15:58:49 +0200

author

mlarsson

date

Thu, 09 Apr 2015 15:58:49 +0200

changeset 7686

fb69749583e8

parent 7031

ee019285a52c

child 7535

7ae4e26cb1e0

permissions

-rw-r--r--

8072621: Clean up around VM_GC_Operations
Reviewed-by: brutisso, jmasa

duke@435	1	/*
mikael@4153	2	* Copyright (c) 2002, 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_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSPROMOTIONLAB_HPP
stefank@2314	26	#define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSPROMOTIONLAB_HPP
stefank@2314	27
stefank@2314	28	#include "gc_implementation/parallelScavenge/objectStartArray.hpp"
jmasa@7031	29	#include "gc_interface/collectedHeap.inline.hpp"
stefank@2314	30	#include "memory/allocation.hpp"
stefank@2314	31
duke@435	32	//
duke@435	33	// PSPromotionLAB is a parallel scavenge promotion lab. This class acts very
duke@435	34	// much like a MutableSpace. We couldn't embed a MutableSpace, though, as
duke@435	35	// it has a considerable number of asserts and invariants that are violated.
duke@435	36	//
duke@435	37
duke@435	38	class ObjectStartArray;
duke@435	39
zgu@3900	40	class PSPromotionLAB : public CHeapObj<mtGC> {
duke@435	41	protected:
coleenp@548	42	static size_t filler_header_size;
duke@435	43
duke@435	44	enum LabState {
duke@435	45	needs_flush,
duke@435	46	flushed,
duke@435	47	zero_size
duke@435	48	};
duke@435	49
duke@435	50	HeapWord* _top;
duke@435	51	HeapWord* _bottom;
duke@435	52	HeapWord* _end;
duke@435	53	LabState _state;
duke@435	54
duke@435	55	void set_top(HeapWord* value) { _top = value; }
duke@435	56	void set_bottom(HeapWord* value) { _bottom = value; }
duke@435	57	void set_end(HeapWord* value) { _end = value; }
duke@435	58
duke@435	59	// The shared initialize code invokes this.
duke@435	60	debug_only(virtual bool lab_is_valid(MemRegion lab) { return false; });
duke@435	61
duke@435	62	PSPromotionLAB() : _top(NULL), _bottom(NULL), _end(NULL) { }
duke@435	63
duke@435	64	public:
duke@435	65	// Filling and flushing.
duke@435	66	void initialize(MemRegion lab);
duke@435	67
duke@435	68	virtual void flush();
duke@435	69
duke@435	70	// Accessors
duke@435	71	HeapWord* bottom() const { return _bottom; }
duke@435	72	HeapWord* end() const { return _end; }
duke@435	73	HeapWord* top() const { return _top; }
duke@435	74
duke@435	75	bool is_flushed() { return _state == flushed; }
duke@435	76
stefank@3181	77	bool unallocate_object(HeapWord* obj, size_t obj_size);
duke@435	78
duke@435	79	// Returns a subregion containing all objects in this space.
duke@435	80	MemRegion used_region() { return MemRegion(bottom(), top()); }
duke@435	81
duke@435	82	// Boolean querries.
duke@435	83	bool is_empty() const { return used() == 0; }
duke@435	84	bool not_empty() const { return used() > 0; }
duke@435	85	bool contains(const void* p) const { return _bottom <= p && p < _end; }
duke@435	86
duke@435	87	// Size computations. Sizes are in bytes.
duke@435	88	size_t capacity() const { return byte_size(bottom(), end()); }
duke@435	89	size_t used() const { return byte_size(bottom(), top()); }
duke@435	90	size_t free() const { return byte_size(top(), end()); }
duke@435	91	};
duke@435	92
duke@435	93	class PSYoungPromotionLAB : public PSPromotionLAB {
duke@435	94	public:
duke@435	95	PSYoungPromotionLAB() { }
duke@435	96
duke@435	97	// Not MT safe
jmasa@7031	98	inline HeapWord* allocate(size_t size);
duke@435	99
jmasa@7031	100	debug_only(virtual bool lab_is_valid(MemRegion lab);)
duke@435	101	};
duke@435	102
duke@435	103	class PSOldPromotionLAB : public PSPromotionLAB {
duke@435	104	private:
duke@435	105	ObjectStartArray* _start_array;
duke@435	106
duke@435	107	public:
duke@435	108	PSOldPromotionLAB() : _start_array(NULL) { }
duke@435	109	PSOldPromotionLAB(ObjectStartArray* start_array) : _start_array(start_array) { }
duke@435	110
duke@435	111	void set_start_array(ObjectStartArray* start_array) { _start_array = start_array; }
duke@435	112
duke@435	113	void flush();
duke@435	114
duke@435	115	// Not MT safe
duke@435	116	HeapWord* allocate(size_t size) {
duke@435	117	// Cannot test for this now that we're doing promotion failures
duke@435	118	// assert(_state != flushed, "Sanity");
duke@435	119	assert(_start_array != NULL, "Sanity");
duke@435	120	HeapWord* obj = top();
duke@435	121	HeapWord* new_top = obj + size;
duke@435	122	// The 'new_top>obj' check is needed to detect overflow of obj+size.
duke@435	123	if (new_top > obj && new_top <= end()) {
duke@435	124	set_top(new_top);
duke@435	125	assert(is_object_aligned((intptr_t)obj) && is_object_aligned((intptr_t)new_top),
duke@435	126	"checking alignment");
duke@435	127	_start_array->allocate_block(obj);
duke@435	128	return obj;
duke@435	129	}
duke@435	130
duke@435	131	return NULL;
duke@435	132	}
duke@435	133
duke@435	134	debug_only(virtual bool lab_is_valid(MemRegion lab));
duke@435	135	};
stefank@2314	136
stefank@2314	137	#endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSPROMOTIONLAB_HPP