1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
/* poolams.h: AUTOMATIC MARK & SWEEP POOL CLASS INTERFACE
 *
 * $Id: //info.ravenbrook.com/project/mps/custom/cet/main/code/poolams.h#8 $
 * Copyright (c) 2001-2014 Ravenbrook Limited.  See end of file for license.
 * Portions copyright (C) 2002 Global Graphics Software.
 *
 * .purpose: Internal interface to AMS functionality.  */

#ifndef poolams_h
#define poolams_h

#include "mpmtypes.h"
#include "mpm.h"
#include "mpmst.h"
#include "ring.h"
#include "bt.h"
#include "mpscams.h"
#include <stdarg.h>


typedef struct AMSStruct *AMS;
typedef struct AMSSegStruct *AMSSeg;


/* AMSRingFunction is the type of the method to find the ring that */
/* the AMS pool is allocating on. */
typedef Ring (*AMSRingFunction)(AMS ams, RankSet rankSet, Size size);
/* AMSSegClassFunction is the type of the method to indicate */
/* the segment class of an AMS pool. Returns a subclass of AMSSegClass. */
/* The type is congruent with SegClassGet functions.  */
typedef SegClass (*AMSSegClassFunction)(void);
/* AMSSegsDestroyFunction is the type of the method to destroy all */
/* segs of an AMS pool. */
typedef void (*AMSSegsDestroyFunction)(AMS ams);
/* AMSSegSizePolicyFunction is the type of the method which picks */
/* a segment size given an object size. */
typedef Res (*AMSSegSizePolicyFunction)(Size *sizeReturn,
                                        Pool pool, Size size,
                                        RankSet rankSet);


typedef struct AMSStruct {
  PoolStruct poolStruct;       /* generic pool structure */
  PoolGenStruct pgenStruct;    /* generation representing the pool */
  PoolGen pgen;                /* NULL or pointer to pgenStruct field */
  Size size;                   /* total segment size of the pool */
  AMSSegSizePolicyFunction segSize; /* SegSize policy */
  AMSSegsDestroyFunction segsDestroy;
  AMSSegClassFunction segClass;/* fn to get the class for segments */
  Bool shareAllocTable;        /* the alloc table is also used as white table */
  Sig sig;                     /* <design/pool/#outer-structure.sig> */
} AMSStruct;


typedef struct AMSSegStruct {
  GCSegStruct gcSegStruct;  /* superclass fields must come first */
  AMS ams;               /* owning ams */
  Count grains;          /* total grains */
  Count freeGrains;      /* free grains */
  Count bufferedGrains;  /* grains in buffers */
  Count newGrains;       /* grains allocated since last collection */
  Count oldGrains;       /* grains allocated prior to last collection */
  Bool allocTableInUse;  /* allocTable is used */
  Index firstFree;       /* 1st free grain, if allocTable is not used */
  BT allocTable;         /* set if grain is allocated */
  /* <design/poolams/#colour.single> */
  Bool marksChanged;     /* seg has been marked since last scan */
  Bool ambiguousFixes;   /* seg has been ambiguously marked since last scan */
  Bool colourTablesInUse;/* the colour tables are in use */
  BT nonwhiteTable;      /* set if grain not white */
  BT nongreyTable;       /* set if not first grain of grey object */
  Sig sig;
} AMSSegStruct;


/* macros to get between child and parent structures */

#define Seg2AMSSeg(seg) ((AMSSeg)(seg))
#define AMSSeg2Seg(amsseg) ((Seg)(amsseg))

#define PoolAMS(pool) PARENT(AMSStruct, poolStruct, pool)
#define AMSPool(ams) (&(ams)->poolStruct)


/* colour ops */

#define AMS_IS_WHITE(seg, index) \
  (!BTGet(Seg2AMSSeg(seg)->nonwhiteTable, index))

#define AMS_IS_GREY(seg, index) \
  (!BTGet(Seg2AMSSeg(seg)->nongreyTable, index))

#define AMS_IS_BLACK(seg, index) \
  (!AMS_IS_GREY(seg, index) && !AMS_IS_WHITE(seg, index))

#define AMS_IS_INVALID_COLOUR(seg, index) \
  (AMS_IS_GREY(seg, index) && !AMS_IS_WHITE(seg, index))

#define AMS_WHITE_GREYEN(seg, index) \
  BEGIN \
    BTRes(Seg2AMSSeg(seg)->nongreyTable, index); \
  END

#define AMS_GREY_BLACKEN(seg, index) \
  BEGIN \
    BTSet(Seg2AMSSeg(seg)->nongreyTable, index); \
    BTSet(Seg2AMSSeg(seg)->nonwhiteTable, index); \
  END

#define AMS_WHITE_BLACKEN(seg, index) \
  BEGIN \
    BTSet(Seg2AMSSeg(seg)->nonwhiteTable, index); \
  END

#define AMS_RANGE_WHITE_BLACKEN(seg, base, limit) \
  BEGIN \
    BTSetRange(Seg2AMSSeg(seg)->nonwhiteTable, base, limit); \
  END

#define AMS_RANGE_BLACKEN(seg, base, limit) \
  BEGIN \
    BTSetRange(Seg2AMSSeg(seg)->nonwhiteTable, base, limit); \
    BTSetRange(Seg2AMSSeg(seg)->nongreyTable, base, limit); \
  END

#define AMS_RANGE_WHITEN(seg, base, limit) \
  BEGIN \
    BTResRange(Seg2AMSSeg(seg)->nonwhiteTable, base, limit); \
    BTSetRange(Seg2AMSSeg(seg)->nongreyTable, base, limit); \
  END

#define AMSFindGrey(pos, dummy, seg, base, limit) \
  BTFindShortResRange(pos, dummy, Seg2AMSSeg(seg)->nongreyTable, \
                      base, limit, 1)

#define AMSFindWhite(pos, dummy, seg, base, limit) \
  BTFindShortResRange(pos, dummy, Seg2AMSSeg(seg)->nonwhiteTable, \
                      base, limit, 1)

#define AMS_FIND_WHITE_RANGE(baseOut, limitOut, seg, base, limit) \
  BTFindLongResRange(baseOut, limitOut, Seg2AMSSeg(seg)->nonwhiteTable, \
                     base, limit, 1)

#define AMS_ALLOCED(seg, index) \
  (Seg2AMSSeg(seg)->allocTableInUse \
   ? BTGet(Seg2AMSSeg(seg)->allocTable, index) \
   : (Seg2AMSSeg(seg)->firstFree > (index)))


/* the rest */

extern Res AMSInitInternal(AMS ams, Arena arena, PoolClass klass,
                           Chain chain, unsigned gen,
                           Bool shareAllocTable, ArgList args);
extern void AMSFinish(Inst inst);
extern Bool AMSCheck(AMS ams);

#define AMSChain(ams) ((ams)->chain)

extern void AMSSegFreeWalk(AMSSeg amsseg, FreeBlockVisitor f, void *p);

extern void AMSSegFreeCheck(AMSSeg amsseg);

extern Bool AMSSegCheck(AMSSeg seg);


/* class declarations */

typedef AMS AMSPool;
DECLARE_CLASS(Pool, AMSPool, AbstractCollectPool);

typedef AMS AMSDebugPool;
DECLARE_CLASS(Pool, AMSDebugPool, AMSPool);

DECLARE_CLASS(Seg, AMSSeg, MutatorSeg);


#endif /* poolams_h */


/* C. COPYRIGHT AND LICENSE
 *
 * Copyright (C) 2001-2014 Ravenbrook Limited <http://www.ravenbrook.com/>.
 * All rights reserved.  This is an open source license.  Contact
 * Ravenbrook for commercial licensing options.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 * 1. Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 *
 * 3. Redistributions in any form must be accompanied by information on how
 * to obtain complete source code for this software and any accompanying
 * software that uses this software.  The source code must either be
 * included in the distribution or be available for no more than the cost
 * of distribution plus a nominal fee, and must be freely redistributable
 * under reasonable conditions.  For an executable file, complete source
 * code means the source code for all modules it contains. It does not
 * include source code for modules or files that typically accompany the
 * major components of the operating system on which the executable file
 * runs.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
 * PURPOSE, OR NON-INFRINGEMENT, ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT HOLDERS AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */