summaryrefslogtreecommitdiffstats
path: root/db/mork/src/morkZone.cpp
blob: 239e86bba02cdb8494235968c197ef482e0f62d5 (plain)
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
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-  */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef _MDB_
#include "mdb.h"
#endif

#ifndef _MORK_
#include "mork.h"
#endif

#ifndef _MORKNODE_
#include "morkNode.h"
#endif

#ifndef _MORKZONE_
#include "morkZone.h"
#endif

#ifndef _MORKENV_
#include "morkEnv.h"
#endif

//3456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789

// { ===== begin morkNode interface =====
// public: // morkNode virtual methods
void morkZone::CloseMorkNode(morkEnv* ev) // CloseZone() only if open
{
  if ( this->IsOpenNode() )
  {
    this->MarkClosing();
    this->CloseZone(ev);
    this->MarkShut();
  }
}

morkZone::~morkZone() // assert that CloseZone() executed earlier
{
  MORK_ASSERT(this->IsShutNode());
}

// public: // morkMap construction & destruction
morkZone::morkZone(morkEnv* ev, const morkUsage& inUsage,
  nsIMdbHeap* ioNodeHeap, nsIMdbHeap* ioZoneHeap)
: morkNode(ev, inUsage, ioNodeHeap)
, mZone_Heap( 0 )
, mZone_HeapVolume( 0 )
, mZone_BlockVolume( 0 )
, mZone_RunVolume( 0 )
, mZone_ChipVolume( 0 )
  
, mZone_FreeOldRunVolume( 0 )
  
, mZone_HunkCount( 0 )
, mZone_FreeOldRunCount( 0 )

, mZone_HunkList( 0 )
, mZone_FreeOldRunList( 0 )
  
, mZone_At( 0 )
, mZone_AtSize( 0 )
    
  // morkRun*     mZone_FreeRuns[ morkZone_kBuckets + 1 ];
{

  morkRun** runs = mZone_FreeRuns;
  morkRun** end = runs + (morkZone_kBuckets + 1); // one past last slot
  --runs; // prepare for preincrement
  while ( ++runs < end ) // another slot in array?
    *runs = 0; // clear all the slots
  
  if ( ev->Good() )
  {
    if ( ioZoneHeap )
    {
      nsIMdbHeap_SlotStrongHeap(ioZoneHeap, ev, &mZone_Heap);
      if ( ev->Good() )
        mNode_Derived = morkDerived_kZone;
    }
    else
      ev->NilPointerError();
  }
}

void morkZone::CloseZone(morkEnv* ev) // called by CloseMorkNode()
{
    if ( this->IsNode() )
    {
      nsIMdbHeap* heap = mZone_Heap;
      if ( heap )
      {
        morkHunk* hunk = 0;
        nsIMdbEnv* mev = ev->AsMdbEnv();
        
        morkHunk* next = mZone_HunkList;
        while ( ( hunk = next ) != 0 )
        {
#ifdef morkHunk_USE_TAG_SLOT
          if ( !hunk->HunkGoodTag()  )
            hunk->BadHunkTagWarning(ev);
#endif /* morkHunk_USE_TAG_SLOT */

          next = hunk->HunkNext();
          heap->Free(mev, hunk);
        }
      }
      nsIMdbHeap_SlotStrongHeap((nsIMdbHeap*) 0, ev, &mZone_Heap);
      this->MarkShut();
    }
    else
      this->NonNodeError(ev);
}

// } ===== end morkNode methods =====

/*static*/ void
morkZone::NonZoneTypeError(morkEnv* ev)
{
  ev->NewError("non morkZone");
}

/*static*/ void
morkZone::NilZoneHeapError(morkEnv* ev)
{
  ev->NewError("nil mZone_Heap");
}

/*static*/ void
morkHunk::BadHunkTagWarning(morkEnv* ev)
{
  ev->NewWarning("bad mHunk_Tag");
}

/*static*/ void
morkRun::BadRunTagError(morkEnv* ev)
{
  ev->NewError("bad mRun_Tag");
}

/*static*/ void
morkRun::RunSizeAlignError(morkEnv* ev)
{
  ev->NewError("bad RunSize() alignment");
}

// { ===== begin morkZone methods =====


mork_size morkZone::zone_grow_at(morkEnv* ev, mork_size inNeededSize)
{
  mZone_At = 0;       // remove any ref to current hunk
  mZone_AtSize = 0;   // zero available bytes in current hunk
  
  mork_size runSize = 0; // actual size of a particular run
  
  // try to find a run in old run list with at least inNeededSize bytes:
  morkRun* run = mZone_FreeOldRunList; // cursor in list scan
  morkRun* prev = 0; // the node before run in the list scan
 
  while ( run ) // another run in list to check?
  {
    morkOldRun* oldRun = (morkOldRun*) run;
    mork_size oldSize = oldRun->OldSize();
    if ( oldSize >= inNeededSize ) // found one big enough?
    {
      runSize = oldSize;
      break; // end while loop early
    }
    prev = run; // remember last position in singly linked list
    run = run->RunNext(); // advance cursor to next node in list
  }
  if ( runSize && run ) // found a usable old run?
  {
    morkRun* next = run->RunNext();
    if ( prev ) // another node in free list precedes run?
      prev->RunSetNext(next); // unlink run
    else
      mZone_FreeOldRunList = next; // unlink run from head of list
      
    morkOldRun *oldRun = (morkOldRun *) run;
    oldRun->OldSetSize(runSize);
    mZone_At = (mork_u1*) run;
    mZone_AtSize = runSize;

#ifdef morkZone_CONFIG_DEBUG
#ifdef morkZone_CONFIG_ALIGN_8
    mork_ip lowThree = ((mork_ip) mZone_At) & 7;
    if ( lowThree ) // not 8 byte aligned?
#else /*morkZone_CONFIG_ALIGN_8*/
    mork_ip lowTwo = ((mork_ip) mZone_At) & 3;
    if ( lowTwo ) // not 4 byte aligned?
#endif /*morkZone_CONFIG_ALIGN_8*/
      ev->NewWarning("mZone_At not aligned");
#endif /*morkZone_CONFIG_DEBUG*/
  }
  else // need to allocate a brand new run
  {
    inNeededSize += 7; // allow for possible alignment padding
    mork_size newSize = ( inNeededSize > morkZone_kNewHunkSize )?
      inNeededSize : morkZone_kNewHunkSize;
      
    morkHunk* hunk = this->zone_new_hunk(ev, newSize);
    if ( hunk )
    {
      morkRun* hunkRun = hunk->HunkRun();
      mork_u1* at = (mork_u1*) hunkRun->RunAsBlock();
      mork_ip lowBits = ((mork_ip) at) & 7;
      if ( lowBits ) // not 8 byte aligned?
      {
        mork_ip skip = (8 - lowBits); // skip the complement to align
        at += skip;
        newSize -= skip;
      }
      mZone_At = at;
      mZone_AtSize = newSize;
    }
  }
  
  return mZone_AtSize;
}

morkHunk* morkZone::zone_new_hunk(morkEnv* ev, mdb_size inSize) // alloc  
{
  mdb_size hunkSize = inSize + sizeof(morkHunk);
  void* outBlock = 0; // we are going straight to the heap:
  mZone_Heap->Alloc(ev->AsMdbEnv(), hunkSize, &outBlock);
  if ( outBlock )
  {
#ifdef morkZone_CONFIG_VOL_STATS
    mZone_HeapVolume += hunkSize; // track all heap allocations
#endif /* morkZone_CONFIG_VOL_STATS */
  
    morkHunk* hunk = (morkHunk*) outBlock;
#ifdef morkHunk_USE_TAG_SLOT
    hunk->HunkInitTag();
#endif /* morkHunk_USE_TAG_SLOT */
  
    hunk->HunkSetNext(mZone_HunkList);
    mZone_HunkList = hunk;
    ++mZone_HunkCount;
    
    morkRun* run = hunk->HunkRun();
    run->RunSetSize(inSize);
#ifdef morkRun_USE_TAG_SLOT
    run->RunInitTag();
#endif /* morkRun_USE_TAG_SLOT */
    
    return hunk;
  }
  if ( ev->Good() ) // got this far without any error reported yet?
    ev->OutOfMemoryError();
  return (morkHunk*) 0;
}

void* morkZone::zone_new_chip(morkEnv* ev, mdb_size inSize) // alloc  
{
#ifdef morkZone_CONFIG_VOL_STATS
  mZone_BlockVolume += inSize; // sum sizes of both chips and runs
#endif /* morkZone_CONFIG_VOL_STATS */
  
  mork_u1* at = mZone_At;
  mork_size atSize = mZone_AtSize; // available bytes in current hunk
  if ( atSize >= inSize ) // current hunk can satisfy request?
  {
    mZone_At = at + inSize;
    mZone_AtSize = atSize - inSize;
    return at;
  }
  else if ( atSize > morkZone_kMaxHunkWaste ) // over max waste allowed?
  {
    morkHunk* hunk = this->zone_new_hunk(ev, inSize);
    if ( hunk )
      return hunk->HunkRun();
      
    return (void*) 0; // show allocation has failed
  }
  else // get ourselves a new hunk for suballocation:
  {
    atSize = this->zone_grow_at(ev, inSize); // get a new hunk
  }

  if ( atSize >= inSize ) // current hunk can satisfy request?
  {
    at = mZone_At;
    mZone_At = at + inSize;
    mZone_AtSize = atSize - inSize;
    return at;
  }
  
  if ( ev->Good() ) // got this far without any error reported yet?
    ev->OutOfMemoryError();
    
  return (void*) 0; // show allocation has failed
}

void* morkZone::ZoneNewChip(morkEnv* ev, mdb_size inSize) // alloc  
{
#ifdef morkZone_CONFIG_ARENA

#ifdef morkZone_CONFIG_DEBUG
  if ( !this->IsZone() )
    this->NonZoneTypeError(ev);
  else if ( !mZone_Heap )
    this->NilZoneHeapError(ev);
#endif /*morkZone_CONFIG_DEBUG*/

#ifdef morkZone_CONFIG_ALIGN_8
  inSize += 7;
  inSize &= ~((mork_ip) 7); // force to multiple of 8 bytes
#else /*morkZone_CONFIG_ALIGN_8*/
  inSize += 3;
  inSize &= ~((mork_ip) 3); // force to multiple of 4 bytes
#endif /*morkZone_CONFIG_ALIGN_8*/

#ifdef morkZone_CONFIG_VOL_STATS
  mZone_ChipVolume += inSize; // sum sizes of chips only
#endif /* morkZone_CONFIG_VOL_STATS */

  return this->zone_new_chip(ev, inSize);

#else /*morkZone_CONFIG_ARENA*/
  void* outBlock = 0;
  mZone_Heap->Alloc(ev->AsMdbEnv(), inSize, &outBlock);
  return outBlock;
#endif /*morkZone_CONFIG_ARENA*/
  
}
  
// public: // ...but runs do indeed know how big they are
void* morkZone::ZoneNewRun(morkEnv* ev, mdb_size inSize) // alloc  
{
#ifdef morkZone_CONFIG_ARENA

#ifdef morkZone_CONFIG_DEBUG
  if ( !this->IsZone() )
    this->NonZoneTypeError(ev);
  else if ( !mZone_Heap )
    this->NilZoneHeapError(ev);
#endif /*morkZone_CONFIG_DEBUG*/

  inSize += morkZone_kRoundAdd;
  inSize &= morkZone_kRoundMask;
  if ( inSize <= morkZone_kMaxCachedRun )
  {
    morkRun** bucket = mZone_FreeRuns + (inSize >> morkZone_kRoundBits);
    morkRun* hit = *bucket;
    if ( hit ) // cache hit?
    {
      *bucket = hit->RunNext();
      hit->RunSetSize(inSize);
      return hit->RunAsBlock();
    }
  }
  mdb_size blockSize = inSize + sizeof(morkRun); // plus run overhead
#ifdef morkZone_CONFIG_VOL_STATS
  mZone_RunVolume += blockSize; // sum sizes of runs only
#endif /* morkZone_CONFIG_VOL_STATS */
  morkRun* run = (morkRun*) this->zone_new_chip(ev, blockSize);
  if ( run )
  {
    run->RunSetSize(inSize);
#ifdef morkRun_USE_TAG_SLOT
    run->RunInitTag();
#endif /* morkRun_USE_TAG_SLOT */
    return run->RunAsBlock();
  }
  
  if ( ev->Good() ) // got this far without any error reported yet?
    ev->OutOfMemoryError();
  
  return (void*) 0; // indicate failed allocation

#else /*morkZone_CONFIG_ARENA*/
  void* outBlock = 0;
  mZone_Heap->Alloc(ev->AsMdbEnv(), inSize, &outBlock);
  return outBlock;
#endif /*morkZone_CONFIG_ARENA*/
}

void morkZone::ZoneZapRun(morkEnv* ev, void* ioRunBlock) // free
{
#ifdef morkZone_CONFIG_ARENA

  morkRun* run = morkRun::BlockAsRun(ioRunBlock);
  mdb_size runSize = run->RunSize();
#ifdef morkZone_CONFIG_VOL_STATS
  mZone_BlockVolume -= runSize; // tracking sizes of both chips and runs
#endif /* morkZone_CONFIG_VOL_STATS */

#ifdef morkZone_CONFIG_DEBUG
  if ( !this->IsZone() )
    this->NonZoneTypeError(ev);
  else if ( !mZone_Heap )
    this->NilZoneHeapError(ev);
  else if ( !ioRunBlock )
    ev->NilPointerError();
  else if ( runSize & morkZone_kRoundAdd )
    run->RunSizeAlignError(ev);
#ifdef morkRun_USE_TAG_SLOT
  else if ( !run->RunGoodTag() )
    run->BadRunTagError(ev);
#endif /* morkRun_USE_TAG_SLOT */
#endif /*morkZone_CONFIG_DEBUG*/

  if ( runSize <= morkZone_kMaxCachedRun ) // goes into free run list?
  {
    morkRun** bucket = mZone_FreeRuns + (runSize >> morkZone_kRoundBits);
    run->RunSetNext(*bucket); // push onto free run list
    *bucket = run;
  }
  else // free old run list
  {
    run->RunSetNext(mZone_FreeOldRunList); // push onto free old run list
    mZone_FreeOldRunList = run;
    ++mZone_FreeOldRunCount;
#ifdef morkZone_CONFIG_VOL_STATS
    mZone_FreeOldRunVolume += runSize;
#endif /* morkZone_CONFIG_VOL_STATS */

    morkOldRun* oldRun = (morkOldRun*) run; // to access extra size slot
    oldRun->OldSetSize(runSize); // so we know how big this is later
  }

#else /*morkZone_CONFIG_ARENA*/
  mZone_Heap->Free(ev->AsMdbEnv(), ioRunBlock);
#endif /*morkZone_CONFIG_ARENA*/
}

void* morkZone::ZoneGrowRun(morkEnv* ev, void* ioRunBlock, mdb_size inSize)
{
#ifdef morkZone_CONFIG_ARENA

  morkRun* run = morkRun::BlockAsRun(ioRunBlock);
  mdb_size runSize = run->RunSize();

#ifdef morkZone_CONFIG_DEBUG
  if ( !this->IsZone() )
    this->NonZoneTypeError(ev);
  else if ( !mZone_Heap )
    this->NilZoneHeapError(ev);
#endif /*morkZone_CONFIG_DEBUG*/

#ifdef morkZone_CONFIG_ALIGN_8
  inSize += 7;
  inSize &= ~((mork_ip) 7); // force to multiple of 8 bytes
#else /*morkZone_CONFIG_ALIGN_8*/
  inSize += 3;
  inSize &= ~((mork_ip) 3); // force to multiple of 4 bytes
#endif /*morkZone_CONFIG_ALIGN_8*/

  if ( inSize > runSize )
  {
    void* newBuf = this->ZoneNewRun(ev, inSize);
    if ( newBuf )
    {
      MORK_MEMCPY(newBuf, ioRunBlock, runSize);
      this->ZoneZapRun(ev, ioRunBlock);
      
      return newBuf;
    }
  }
  else
    return ioRunBlock; // old size is big enough
  
  if ( ev->Good() ) // got this far without any error reported yet?
    ev->OutOfMemoryError();
  
  return (void*) 0; // indicate failed allocation

#else /*morkZone_CONFIG_ARENA*/
  void* outBlock = 0;
  mZone_Heap->Free(ev->AsMdbEnv(), ioRunBlock);
  return outBlock;
#endif /*morkZone_CONFIG_ARENA*/
}

//3456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789

// { ===== begin nsIMdbHeap methods =====
/*virtual*/ nsresult
morkZone::Alloc(nsIMdbEnv* mev, // allocate a piece of memory
  mdb_size inSize,   // requested size of new memory block 
  void** outBlock)  // memory block of inSize bytes, or nil
{
  nsresult outErr = NS_OK;
  void* block = 0;
  morkEnv* ev = morkEnv::FromMdbEnv(mev);
  if ( ev )
  {
    block = this->ZoneNewRun(ev, inSize);
    outErr = ev->AsErr();
  }
  else
    outErr = morkEnv_kOutOfMemoryError;

  if ( outBlock )
    *outBlock = block;
    
  return outErr;
}
  
/*virtual*/ nsresult
morkZone::Free(nsIMdbEnv* mev, // free block allocated earlier by Alloc()
  void* inBlock)
{
  nsresult outErr = NS_OK;
  if ( inBlock )
  {
    morkEnv* ev = morkEnv::FromMdbEnv(mev);
    if ( ev )
    {
      this->ZoneZapRun(ev, inBlock);
      outErr = ev->AsErr();
    }
    else
      // XXX 1 is not a valid nsresult
      outErr = static_cast<nsresult>(1);
  }
    
  return outErr;
}

// } ===== end nsIMdbHeap methods =====