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[RTL]
[reactos.git] / reactos / sdk / lib / rtl / heap.c
1 /*
2 * COPYRIGHT: See COPYING in the top level directory
3 * PROJECT: ReactOS system libraries
4 * FILE: lib/rtl/heap.c
5 * PURPOSE: RTL Heap backend allocator
6 * PROGRAMMERS: Copyright 2010 Aleksey Bragin
7 */
8
9 /* Useful references:
10 http://msdn.microsoft.com/en-us/library/ms810466.aspx
11 http://msdn.microsoft.com/en-us/library/ms810603.aspx
12 http://www.securitylab.ru/analytics/216376.php
13 http://binglongx.spaces.live.com/blog/cns!142CBF6D49079DE8!596.entry
14 http://www.phreedom.org/research/exploits/asn1-bitstring/
15 http://illmatics.com/Understanding_the_LFH.pdf
16 http://www.alex-ionescu.com/?p=18
17 */
18
19 /* INCLUDES *****************************************************************/
20
21 #include <rtl.h>
22 #include <heap.h>
23
24 #define NDEBUG
25 #include <debug.h>
26
27 /* Bitmaps stuff */
28
29 /* How many least significant bits are clear */
30 UCHAR RtlpBitsClearLow[] =
31 {
32 8,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,
33 4,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,
34 5,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,
35 4,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,
36 6,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,
37 4,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,
38 5,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,
39 4,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,
40 7,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,
41 4,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,
42 5,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,
43 4,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,
44 6,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,
45 4,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,
46 5,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,
47 4,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0
48 };
49
50 FORCEINLINE
51 UCHAR
52 RtlpFindLeastSetBit(ULONG Bits)
53 {
54 if (Bits & 0xFFFF)
55 {
56 if (Bits & 0xFF)
57 return RtlpBitsClearLow[Bits & 0xFF]; /* Lowest byte */
58 else
59 return RtlpBitsClearLow[(Bits >> 8) & 0xFF] + 8; /* 2nd byte */
60 }
61 else
62 {
63 if ((Bits >> 16) & 0xFF)
64 return RtlpBitsClearLow[(Bits >> 16) & 0xFF] + 16; /* 3rd byte */
65 else
66 return RtlpBitsClearLow[(Bits >> 24) & 0xFF] + 24; /* Highest byte */
67 }
68 }
69
70 /* Maximum size of a tail-filling pattern used for compare operation */
71 UCHAR FillPattern[HEAP_ENTRY_SIZE] =
72 {
73 HEAP_TAIL_FILL,
74 HEAP_TAIL_FILL,
75 HEAP_TAIL_FILL,
76 HEAP_TAIL_FILL,
77 HEAP_TAIL_FILL,
78 HEAP_TAIL_FILL,
79 HEAP_TAIL_FILL,
80 HEAP_TAIL_FILL
81 };
82
83 /* FUNCTIONS *****************************************************************/
84
85 NTSTATUS NTAPI
86 RtlpInitializeHeap(OUT PHEAP Heap,
87 IN ULONG Flags,
88 IN PHEAP_LOCK Lock OPTIONAL,
89 IN PRTL_HEAP_PARAMETERS Parameters)
90 {
91 ULONG NumUCRs = 8;
92 ULONG Index;
93 SIZE_T HeaderSize;
94 NTSTATUS Status;
95 PHEAP_UCR_DESCRIPTOR UcrDescriptor;
96
97 /* Preconditions */
98 ASSERT(Heap != NULL);
99 ASSERT(Parameters != NULL);
100 ASSERT(!(Flags & HEAP_LOCK_USER_ALLOCATED));
101 ASSERT(!(Flags & HEAP_NO_SERIALIZE) || (Lock == NULL)); /* HEAP_NO_SERIALIZE => no lock */
102
103 /* Start out with the size of a plain Heap header */
104 HeaderSize = ROUND_UP(sizeof(HEAP), sizeof(HEAP_ENTRY));
105
106 /* Check if space needs to be added for the Heap Lock */
107 if (!(Flags & HEAP_NO_SERIALIZE))
108 {
109 if (Lock != NULL)
110 /* The user manages the Heap Lock */
111 Flags |= HEAP_LOCK_USER_ALLOCATED;
112 else
113 if (RtlpGetMode() == UserMode)
114 {
115 /* In user mode, the Heap Lock trails the Heap header */
116 Lock = (PHEAP_LOCK) ((ULONG_PTR) (Heap) + HeaderSize);
117 HeaderSize += ROUND_UP(sizeof(HEAP_LOCK), sizeof(HEAP_ENTRY));
118 }
119 }
120
121 /* Add space for the initial Heap UnCommitted Range Descriptor list */
122 UcrDescriptor = (PHEAP_UCR_DESCRIPTOR) ((ULONG_PTR) (Heap) + HeaderSize);
123 HeaderSize += ROUND_UP(NumUCRs * sizeof(HEAP_UCR_DESCRIPTOR), sizeof(HEAP_ENTRY));
124
125 /* Sanity check */
126 ASSERT(HeaderSize <= PAGE_SIZE);
127
128 /* Initialise the Heap Entry header containing the Heap header */
129 Heap->Entry.Size = (USHORT)(HeaderSize >> HEAP_ENTRY_SHIFT);
130 Heap->Entry.Flags = HEAP_ENTRY_BUSY;
131 Heap->Entry.SmallTagIndex = LOBYTE(Heap->Entry.Size) ^ HIBYTE(Heap->Entry.Size) ^ Heap->Entry.Flags;
132 Heap->Entry.PreviousSize = 0;
133 Heap->Entry.SegmentOffset = 0;
134 Heap->Entry.UnusedBytes = 0;
135
136 /* Initialise the Heap header */
137 Heap->Signature = HEAP_SIGNATURE;
138 Heap->Flags = Flags;
139 Heap->ForceFlags = (Flags & (HEAP_NO_SERIALIZE |
140 HEAP_GENERATE_EXCEPTIONS |
141 HEAP_ZERO_MEMORY |
142 HEAP_REALLOC_IN_PLACE_ONLY |
143 HEAP_VALIDATE_PARAMETERS_ENABLED |
144 HEAP_VALIDATE_ALL_ENABLED |
145 HEAP_TAIL_CHECKING_ENABLED |
146 HEAP_CREATE_ALIGN_16 |
147 HEAP_FREE_CHECKING_ENABLED));
148
149 /* Initialise the Heap parameters */
150 Heap->VirtualMemoryThreshold = ROUND_UP(Parameters->VirtualMemoryThreshold, sizeof(HEAP_ENTRY)) >> HEAP_ENTRY_SHIFT;
151 Heap->SegmentReserve = Parameters->SegmentReserve;
152 Heap->SegmentCommit = Parameters->SegmentCommit;
153 Heap->DeCommitFreeBlockThreshold = Parameters->DeCommitFreeBlockThreshold >> HEAP_ENTRY_SHIFT;
154 Heap->DeCommitTotalFreeThreshold = Parameters->DeCommitTotalFreeThreshold >> HEAP_ENTRY_SHIFT;
155 Heap->MaximumAllocationSize = Parameters->MaximumAllocationSize;
156 Heap->CommitRoutine = Parameters->CommitRoutine;
157
158 /* Initialise the Heap validation info */
159 Heap->HeaderValidateCopy = NULL;
160 Heap->HeaderValidateLength = (USHORT)HeaderSize;
161
162 /* Initialise the Heap Lock */
163 if (!(Flags & HEAP_NO_SERIALIZE) && !(Flags & HEAP_LOCK_USER_ALLOCATED))
164 {
165 Status = RtlInitializeHeapLock(&Lock);
166 if (!NT_SUCCESS(Status))
167 return Status;
168 }
169 Heap->LockVariable = Lock;
170
171 /* Initialise the Heap alignment info */
172 if (Flags & HEAP_CREATE_ALIGN_16)
173 {
174 Heap->AlignMask = (ULONG) ~15;
175 Heap->AlignRound = 15 + sizeof(HEAP_ENTRY);
176 }
177 else
178 {
179 Heap->AlignMask = (ULONG) ~(sizeof(HEAP_ENTRY) - 1);
180 Heap->AlignRound = 2 * sizeof(HEAP_ENTRY) - 1;
181 }
182
183 if (Flags & HEAP_TAIL_CHECKING_ENABLED)
184 Heap->AlignRound += sizeof(HEAP_ENTRY);
185
186 /* Initialise the Heap Segment list */
187 for (Index = 0; Index < HEAP_SEGMENTS; ++Index)
188 Heap->Segments[Index] = NULL;
189
190 /* Initialise the Heap Free Heap Entry lists */
191 for (Index = 0; Index < HEAP_FREELISTS; ++Index)
192 InitializeListHead(&Heap->FreeLists[Index]);
193
194 /* Initialise the Heap Virtual Allocated Blocks list */
195 InitializeListHead(&Heap->VirtualAllocdBlocks);
196
197 /* Initialise the Heap UnCommitted Region lists */
198 InitializeListHead(&Heap->UCRSegments);
199 InitializeListHead(&Heap->UCRList);
200
201 /* Register the initial Heap UnCommitted Region Descriptors */
202 for (Index = 0; Index < NumUCRs; ++Index)
203 InsertTailList(&Heap->UCRList, &UcrDescriptor[Index].ListEntry);
204
205 return STATUS_SUCCESS;
206 }
207
208 FORCEINLINE
209 VOID
210 RtlpSetFreeListsBit(PHEAP Heap,
211 PHEAP_FREE_ENTRY FreeEntry)
212 {
213 ULONG Index, Bit;
214
215 ASSERT(FreeEntry->Size < HEAP_FREELISTS);
216
217 /* Calculate offset in the free list bitmap */
218 Index = FreeEntry->Size >> 3; /* = FreeEntry->Size / (sizeof(UCHAR) * 8)*/
219 Bit = 1 << (FreeEntry->Size & 7);
220
221 /* Assure it's not already set */
222 ASSERT((Heap->u.FreeListsInUseBytes[Index] & Bit) == 0);
223
224 /* Set it */
225 Heap->u.FreeListsInUseBytes[Index] |= Bit;
226 }
227
228 FORCEINLINE
229 VOID
230 RtlpClearFreeListsBit(PHEAP Heap,
231 PHEAP_FREE_ENTRY FreeEntry)
232 {
233 ULONG Index, Bit;
234
235 ASSERT(FreeEntry->Size < HEAP_FREELISTS);
236
237 /* Calculate offset in the free list bitmap */
238 Index = FreeEntry->Size >> 3; /* = FreeEntry->Size / (sizeof(UCHAR) * 8)*/
239 Bit = 1 << (FreeEntry->Size & 7);
240
241 /* Assure it was set and the corresponding free list is empty */
242 ASSERT(Heap->u.FreeListsInUseBytes[Index] & Bit);
243 ASSERT(IsListEmpty(&Heap->FreeLists[FreeEntry->Size]));
244
245 /* Clear it */
246 Heap->u.FreeListsInUseBytes[Index] ^= Bit;
247 }
248
249 VOID NTAPI
250 RtlpInsertFreeBlockHelper(PHEAP Heap,
251 PHEAP_FREE_ENTRY FreeEntry,
252 SIZE_T BlockSize,
253 BOOLEAN NoFill)
254 {
255 PLIST_ENTRY FreeListHead, Current;
256 PHEAP_FREE_ENTRY CurrentEntry;
257
258 ASSERT(FreeEntry->Size == BlockSize);
259
260 /* Fill if it's not denied */
261 if (!NoFill)
262 {
263 FreeEntry->Flags &= ~(HEAP_ENTRY_FILL_PATTERN |
264 HEAP_ENTRY_EXTRA_PRESENT |
265 HEAP_ENTRY_BUSY);
266
267 if (Heap->Flags & HEAP_FREE_CHECKING_ENABLED)
268 {
269 RtlFillMemoryUlong((PCHAR)(FreeEntry + 1),
270 (BlockSize << HEAP_ENTRY_SHIFT) - sizeof(*FreeEntry),
271 ARENA_FREE_FILLER);
272
273 FreeEntry->Flags |= HEAP_ENTRY_FILL_PATTERN;
274 }
275 }
276 else
277 {
278 /* Clear out all flags except the last entry one */
279 FreeEntry->Flags &= HEAP_ENTRY_LAST_ENTRY;
280 }
281
282 /* Insert it either into dedicated or non-dedicated list */
283 if (BlockSize < HEAP_FREELISTS)
284 {
285 /* Dedicated list */
286 FreeListHead = &Heap->FreeLists[BlockSize];
287
288 if (IsListEmpty(FreeListHead))
289 {
290 RtlpSetFreeListsBit(Heap, FreeEntry);
291 }
292 }
293 else
294 {
295 /* Non-dedicated one */
296 FreeListHead = &Heap->FreeLists[0];
297 Current = FreeListHead->Flink;
298
299 /* Find a position where to insert it to (the list must be sorted) */
300 while (FreeListHead != Current)
301 {
302 CurrentEntry = CONTAINING_RECORD(Current, HEAP_FREE_ENTRY, FreeList);
303
304 if (BlockSize <= CurrentEntry->Size)
305 break;
306
307 Current = Current->Flink;
308 }
309
310 FreeListHead = Current;
311 }
312
313 /* Actually insert it into the list */
314 InsertTailList(FreeListHead, &FreeEntry->FreeList);
315 }
316
317 VOID NTAPI
318 RtlpInsertFreeBlock(PHEAP Heap,
319 PHEAP_FREE_ENTRY FreeEntry,
320 SIZE_T BlockSize)
321 {
322 USHORT Size, PreviousSize;
323 UCHAR SegmentOffset, Flags;
324 PHEAP_SEGMENT Segment;
325
326 DPRINT("RtlpInsertFreeBlock(%p %p %x)\n", Heap, FreeEntry, BlockSize);
327
328 /* Increase the free size counter */
329 Heap->TotalFreeSize += BlockSize;
330
331 /* Remember certain values */
332 Flags = FreeEntry->Flags;
333 PreviousSize = FreeEntry->PreviousSize;
334 SegmentOffset = FreeEntry->SegmentOffset;
335 Segment = Heap->Segments[SegmentOffset];
336
337 /* Process it */
338 while (BlockSize)
339 {
340 /* Check for the max size */
341 if (BlockSize > HEAP_MAX_BLOCK_SIZE)
342 {
343 Size = HEAP_MAX_BLOCK_SIZE;
344
345 /* Special compensation if it goes above limit just by 1 */
346 if (BlockSize == (HEAP_MAX_BLOCK_SIZE + 1))
347 Size -= 16;
348
349 FreeEntry->Flags = 0;
350 }
351 else
352 {
353 Size = (USHORT)BlockSize;
354 FreeEntry->Flags = Flags;
355 }
356
357 /* Change its size and insert it into a free list */
358 FreeEntry->Size = Size;
359 FreeEntry->PreviousSize = PreviousSize;
360 FreeEntry->SegmentOffset = SegmentOffset;
361
362 /* Call a helper to actually insert the block */
363 RtlpInsertFreeBlockHelper(Heap, FreeEntry, Size, FALSE);
364
365 /* Update sizes */
366 PreviousSize = Size;
367 BlockSize -= Size;
368
369 /* Go to the next entry */
370 FreeEntry = (PHEAP_FREE_ENTRY)((PHEAP_ENTRY)FreeEntry + Size);
371
372 /* Check if that's all */
373 if ((PHEAP_ENTRY)FreeEntry >= Segment->LastValidEntry) return;
374 }
375
376 /* Update previous size if needed */
377 if (!(Flags & HEAP_ENTRY_LAST_ENTRY))
378 FreeEntry->PreviousSize = PreviousSize;
379 }
380
381 VOID NTAPI
382 RtlpRemoveFreeBlock(PHEAP Heap,
383 PHEAP_FREE_ENTRY FreeEntry,
384 BOOLEAN Dedicated,
385 BOOLEAN NoFill)
386 {
387 SIZE_T Result, RealSize;
388
389 /* Remove the free block and update the freelists bitmap */
390 if (RemoveEntryList(&FreeEntry->FreeList) &&
391 (Dedicated || (!Dedicated && FreeEntry->Size < HEAP_FREELISTS)))
392 {
393 RtlpClearFreeListsBit(Heap, FreeEntry);
394 }
395
396 /* Fill with pattern if necessary */
397 if (!NoFill &&
398 (FreeEntry->Flags & HEAP_ENTRY_FILL_PATTERN))
399 {
400 RealSize = (FreeEntry->Size << HEAP_ENTRY_SHIFT) - sizeof(*FreeEntry);
401
402 /* Deduct extra stuff from block's real size */
403 if (FreeEntry->Flags & HEAP_ENTRY_EXTRA_PRESENT &&
404 RealSize > sizeof(HEAP_FREE_ENTRY_EXTRA))
405 {
406 RealSize -= sizeof(HEAP_FREE_ENTRY_EXTRA);
407 }
408
409 /* Check if the free filler is intact */
410 Result = RtlCompareMemoryUlong((PCHAR)(FreeEntry + 1),
411 RealSize,
412 ARENA_FREE_FILLER);
413
414 if (Result != RealSize)
415 {
416 DPRINT1("Free heap block %p modified at %p after it was freed\n",
417 FreeEntry,
418 (PCHAR)(FreeEntry + 1) + Result);
419 }
420 }
421 }
422
423 SIZE_T NTAPI
424 RtlpGetSizeOfBigBlock(PHEAP_ENTRY HeapEntry)
425 {
426 PHEAP_VIRTUAL_ALLOC_ENTRY VirtualEntry;
427
428 /* Get pointer to the containing record */
429 VirtualEntry = CONTAINING_RECORD(HeapEntry, HEAP_VIRTUAL_ALLOC_ENTRY, BusyBlock);
430 ASSERT(VirtualEntry->BusyBlock.Size >= sizeof(HEAP_VIRTUAL_ALLOC_ENTRY));
431
432 /* Restore the real size */
433 return VirtualEntry->CommitSize - HeapEntry->Size;
434 }
435
436 PHEAP_UCR_DESCRIPTOR NTAPI
437 RtlpCreateUnCommittedRange(PHEAP_SEGMENT Segment)
438 {
439 PLIST_ENTRY Entry;
440 PHEAP_UCR_DESCRIPTOR UcrDescriptor;
441 PHEAP_UCR_SEGMENT UcrSegment;
442 PHEAP Heap = Segment->Heap;
443 SIZE_T ReserveSize = 16 * PAGE_SIZE;
444 SIZE_T CommitSize = 1 * PAGE_SIZE;
445 NTSTATUS Status;
446
447 DPRINT("RtlpCreateUnCommittedRange(%p)\n", Segment);
448
449 /* Check if we have unused UCRs */
450 if (IsListEmpty(&Heap->UCRList))
451 {
452 /* Get a pointer to the first UCR segment */
453 UcrSegment = CONTAINING_RECORD(Heap->UCRSegments.Flink, HEAP_UCR_SEGMENT, ListEntry);
454
455 /* Check the list of UCR segments */
456 if (IsListEmpty(&Heap->UCRSegments) ||
457 UcrSegment->ReservedSize == UcrSegment->CommittedSize)
458 {
459 /* We need to create a new one. Reserve 16 pages for it */
460 UcrSegment = NULL;
461 Status = ZwAllocateVirtualMemory(NtCurrentProcess(),
462 (PVOID *)&UcrSegment,
463 0,
464 &ReserveSize,
465 MEM_RESERVE,
466 PAGE_READWRITE);
467
468 if (!NT_SUCCESS(Status)) return NULL;
469
470 /* Commit one page */
471 Status = ZwAllocateVirtualMemory(NtCurrentProcess(),
472 (PVOID *)&UcrSegment,
473 0,
474 &CommitSize,
475 MEM_COMMIT,
476 PAGE_READWRITE);
477
478 if (!NT_SUCCESS(Status))
479 {
480 /* Release reserved memory */
481 ZwFreeVirtualMemory(NtCurrentProcess(),
482 (PVOID *)&UcrSegment,
483 &ReserveSize,
484 MEM_RELEASE);
485 return NULL;
486 }
487
488 /* Set it's data */
489 UcrSegment->ReservedSize = ReserveSize;
490 UcrSegment->CommittedSize = CommitSize;
491
492 /* Add it to the head of the list */
493 InsertHeadList(&Heap->UCRSegments, &UcrSegment->ListEntry);
494
495 /* Get a pointer to the first available UCR descriptor */
496 UcrDescriptor = (PHEAP_UCR_DESCRIPTOR)(UcrSegment + 1);
497 }
498 else
499 {
500 /* It's possible to use existing UCR segment. Commit one more page */
501 UcrDescriptor = (PHEAP_UCR_DESCRIPTOR)((PCHAR)UcrSegment + UcrSegment->CommittedSize);
502 Status = ZwAllocateVirtualMemory(NtCurrentProcess(),
503 (PVOID *)&UcrDescriptor,
504 0,
505 &CommitSize,
506 MEM_COMMIT,
507 PAGE_READWRITE);
508
509 if (!NT_SUCCESS(Status)) return NULL;
510
511 /* Update sizes */
512 UcrSegment->CommittedSize += CommitSize;
513 }
514
515 /* There is a whole bunch of new UCR descriptors. Put them into the unused list */
516 while ((PCHAR)(UcrDescriptor + 1) <= (PCHAR)UcrSegment + UcrSegment->CommittedSize)
517 {
518 InsertTailList(&Heap->UCRList, &UcrDescriptor->ListEntry);
519 UcrDescriptor++;
520 }
521 }
522
523 /* There are unused UCRs, just get the first one */
524 Entry = RemoveHeadList(&Heap->UCRList);
525 UcrDescriptor = CONTAINING_RECORD(Entry, HEAP_UCR_DESCRIPTOR, ListEntry);
526 return UcrDescriptor;
527 }
528
529 VOID NTAPI
530 RtlpDestroyUnCommittedRange(PHEAP_SEGMENT Segment,
531 PHEAP_UCR_DESCRIPTOR UcrDescriptor)
532 {
533 /* Zero it out */
534 UcrDescriptor->Address = NULL;
535 UcrDescriptor->Size = 0;
536
537 /* Put it into the heap's list of unused UCRs */
538 InsertHeadList(&Segment->Heap->UCRList, &UcrDescriptor->ListEntry);
539 }
540
541 VOID NTAPI
542 RtlpInsertUnCommittedPages(PHEAP_SEGMENT Segment,
543 ULONG_PTR Address,
544 SIZE_T Size)
545 {
546 PLIST_ENTRY Current;
547 PHEAP_UCR_DESCRIPTOR UcrDescriptor;
548
549 DPRINT("RtlpInsertUnCommittedPages(%p %08Ix %Ix)\n", Segment, Address, Size);
550
551 /* Go through the list of UCR descriptors, they are sorted from lowest address
552 to the highest */
553 Current = Segment->UCRSegmentList.Flink;
554 while (Current != &Segment->UCRSegmentList)
555 {
556 UcrDescriptor = CONTAINING_RECORD(Current, HEAP_UCR_DESCRIPTOR, SegmentEntry);
557
558 if ((ULONG_PTR)UcrDescriptor->Address > Address)
559 {
560 /* Check for a really lucky case */
561 if ((Address + Size) == (ULONG_PTR)UcrDescriptor->Address)
562 {
563 /* Exact match */
564 UcrDescriptor->Address = (PVOID)Address;
565 UcrDescriptor->Size += Size;
566 return;
567 }
568
569 /* We found the block before which the new one should go */
570 break;
571 }
572 else if (((ULONG_PTR)UcrDescriptor->Address + UcrDescriptor->Size) == Address)
573 {
574 /* Modify this entry */
575 Address = (ULONG_PTR)UcrDescriptor->Address;
576 Size += UcrDescriptor->Size;
577
578 /* Advance to the next descriptor */
579 Current = Current->Flink;
580
581 /* Remove the current descriptor from the list and destroy it */
582 RemoveEntryList(&UcrDescriptor->SegmentEntry);
583 RtlpDestroyUnCommittedRange(Segment, UcrDescriptor);
584
585 Segment->NumberOfUnCommittedRanges--;
586 }
587 else
588 {
589 /* Advance to the next descriptor */
590 Current = Current->Flink;
591 }
592 }
593
594 /* Create a new UCR descriptor */
595 UcrDescriptor = RtlpCreateUnCommittedRange(Segment);
596 if (!UcrDescriptor) return;
597
598 UcrDescriptor->Address = (PVOID)Address;
599 UcrDescriptor->Size = Size;
600
601 /* "Current" is the descriptor before which our one should go */
602 InsertTailList(Current, &UcrDescriptor->SegmentEntry);
603
604 DPRINT("Added segment UCR with base %08Ix, size 0x%x\n", Address, Size);
605
606 /* Increase counters */
607 Segment->NumberOfUnCommittedRanges++;
608 }
609
610 PHEAP_FREE_ENTRY NTAPI
611 RtlpFindAndCommitPages(PHEAP Heap,
612 PHEAP_SEGMENT Segment,
613 PSIZE_T Size,
614 PVOID AddressRequested)
615 {
616 PLIST_ENTRY Current;
617 ULONG_PTR Address = 0;
618 PHEAP_UCR_DESCRIPTOR UcrDescriptor, PreviousUcr = NULL;
619 PHEAP_ENTRY FirstEntry, LastEntry;
620 NTSTATUS Status;
621
622 DPRINT("RtlpFindAndCommitPages(%p %p %Ix %08Ix)\n", Heap, Segment, *Size, Address);
623
624 /* Go through UCRs in a segment */
625 Current = Segment->UCRSegmentList.Flink;
626 while (Current != &Segment->UCRSegmentList)
627 {
628 UcrDescriptor = CONTAINING_RECORD(Current, HEAP_UCR_DESCRIPTOR, SegmentEntry);
629
630 /* Check if we can use that one right away */
631 if (UcrDescriptor->Size >= *Size &&
632 (UcrDescriptor->Address == AddressRequested || !AddressRequested))
633 {
634 /* Get the address */
635 Address = (ULONG_PTR)UcrDescriptor->Address;
636
637 /* Commit it */
638 if (Heap->CommitRoutine)
639 {
640 Status = Heap->CommitRoutine(Heap, (PVOID *)&Address, Size);
641 }
642 else
643 {
644 Status = ZwAllocateVirtualMemory(NtCurrentProcess(),
645 (PVOID *)&Address,
646 0,
647 Size,
648 MEM_COMMIT,
649 PAGE_READWRITE);
650 }
651
652 DPRINT("Committed %Iu bytes at base %08Ix, UCR size is %lu\n", *Size, Address, UcrDescriptor->Size);
653
654 /* Fail in unsuccessful case */
655 if (!NT_SUCCESS(Status))
656 {
657 DPRINT1("Committing page failed with status 0x%08X\n", Status);
658 return NULL;
659 }
660
661 /* Update tracking numbers */
662 Segment->NumberOfUnCommittedPages -= (ULONG)(*Size / PAGE_SIZE);
663
664 /* Calculate first and last entries */
665 FirstEntry = (PHEAP_ENTRY)Address;
666
667 /* Go through the entries to find the last one */
668 if (PreviousUcr)
669 LastEntry = (PHEAP_ENTRY)((ULONG_PTR)PreviousUcr->Address + PreviousUcr->Size);
670 else
671 LastEntry = &Segment->Entry;
672
673 while (!(LastEntry->Flags & HEAP_ENTRY_LAST_ENTRY))
674 {
675 ASSERT(LastEntry->Size != 0);
676 LastEntry += LastEntry->Size;
677 }
678 ASSERT((LastEntry + LastEntry->Size) == FirstEntry);
679
680 /* Unmark it as a last entry */
681 LastEntry->Flags &= ~HEAP_ENTRY_LAST_ENTRY;
682
683 /* Update UCR descriptor */
684 UcrDescriptor->Address = (PVOID)((ULONG_PTR)UcrDescriptor->Address + *Size);
685 UcrDescriptor->Size -= *Size;
686
687 DPRINT("Updating UcrDescriptor %p, new Address %p, size %lu\n",
688 UcrDescriptor, UcrDescriptor->Address, UcrDescriptor->Size);
689
690 /* Set various first entry fields */
691 FirstEntry->SegmentOffset = LastEntry->SegmentOffset;
692 FirstEntry->Size = (USHORT)(*Size >> HEAP_ENTRY_SHIFT);
693 FirstEntry->PreviousSize = LastEntry->Size;
694
695 /* Check if anything left in this UCR */
696 if (UcrDescriptor->Size == 0)
697 {
698 /* It's fully exhausted */
699
700 /* Check if this is the end of the segment */
701 if(UcrDescriptor->Address == Segment->LastValidEntry)
702 {
703 FirstEntry->Flags = HEAP_ENTRY_LAST_ENTRY;
704 }
705 else
706 {
707 FirstEntry->Flags = 0;
708 /* Update field of next entry */
709 ASSERT((FirstEntry + FirstEntry->Size)->PreviousSize == 0);
710 (FirstEntry + FirstEntry->Size)->PreviousSize = FirstEntry->Size;
711 }
712
713 /* This UCR needs to be removed because it became useless */
714 RemoveEntryList(&UcrDescriptor->SegmentEntry);
715
716 RtlpDestroyUnCommittedRange(Segment, UcrDescriptor);
717 Segment->NumberOfUnCommittedRanges--;
718 }
719 else
720 {
721 FirstEntry->Flags = HEAP_ENTRY_LAST_ENTRY;
722 }
723
724 /* We're done */
725 return (PHEAP_FREE_ENTRY)FirstEntry;
726 }
727
728 /* Advance to the next descriptor */
729 PreviousUcr = UcrDescriptor;
730 Current = Current->Flink;
731 }
732
733 return NULL;
734 }
735
736 VOID NTAPI
737 RtlpDeCommitFreeBlock(PHEAP Heap,
738 PHEAP_FREE_ENTRY FreeEntry,
739 SIZE_T Size)
740 {
741 PHEAP_SEGMENT Segment;
742 PHEAP_ENTRY PrecedingInUseEntry = NULL, NextInUseEntry = NULL;
743 PHEAP_FREE_ENTRY NextFreeEntry;
744 PHEAP_UCR_DESCRIPTOR UcrDescriptor;
745 SIZE_T PrecedingSize, NextSize, DecommitSize;
746 ULONG_PTR DecommitBase;
747 NTSTATUS Status;
748
749 DPRINT("Decommitting %p %p %x\n", Heap, FreeEntry, Size);
750
751 /* We can't decommit if there is a commit routine! */
752 if (Heap->CommitRoutine)
753 {
754 /* Just add it back the usual way */
755 RtlpInsertFreeBlock(Heap, FreeEntry, Size);
756 return;
757 }
758
759 /* Get the segment */
760 Segment = Heap->Segments[FreeEntry->SegmentOffset];
761
762 /* Get the preceding entry */
763 DecommitBase = ROUND_UP(FreeEntry, PAGE_SIZE);
764 PrecedingSize = (PHEAP_ENTRY)DecommitBase - (PHEAP_ENTRY)FreeEntry;
765
766 if (PrecedingSize == 1)
767 {
768 /* Just 1 heap entry, increase the base/size */
769 DecommitBase += PAGE_SIZE;
770 PrecedingSize += PAGE_SIZE >> HEAP_ENTRY_SHIFT;
771 }
772 else if (FreeEntry->PreviousSize &&
773 (DecommitBase == (ULONG_PTR)FreeEntry))
774 {
775 PrecedingInUseEntry = (PHEAP_ENTRY)FreeEntry - FreeEntry->PreviousSize;
776 }
777
778 /* Get the next entry */
779 NextFreeEntry = (PHEAP_FREE_ENTRY)((PHEAP_ENTRY)FreeEntry + Size);
780 DecommitSize = ROUND_DOWN(NextFreeEntry, PAGE_SIZE);
781 NextSize = (PHEAP_ENTRY)NextFreeEntry - (PHEAP_ENTRY)DecommitSize;
782
783 if (NextSize == 1)
784 {
785 /* Just 1 heap entry, increase the size */
786 DecommitSize -= PAGE_SIZE;
787 NextSize += PAGE_SIZE >> HEAP_ENTRY_SHIFT;
788 }
789 else if (NextSize == 0 &&
790 !(FreeEntry->Flags & HEAP_ENTRY_LAST_ENTRY))
791 {
792 NextInUseEntry = (PHEAP_ENTRY)NextFreeEntry;
793 }
794
795 NextFreeEntry = (PHEAP_FREE_ENTRY)((PHEAP_ENTRY)NextFreeEntry - NextSize);
796
797 /* Calculate real decommit size */
798 if (DecommitSize > DecommitBase)
799 {
800 DecommitSize -= DecommitBase;
801 }
802 else
803 {
804 /* Nothing to decommit */
805 RtlpInsertFreeBlock(Heap, FreeEntry, Size);
806 return;
807 }
808
809 /* A decommit is necessary. Create a UCR descriptor */
810 UcrDescriptor = RtlpCreateUnCommittedRange(Segment);
811 if (!UcrDescriptor)
812 {
813 DPRINT1("HEAP: Failed to create UCR descriptor\n");
814 RtlpInsertFreeBlock(Heap, FreeEntry, PrecedingSize);
815 return;
816 }
817
818 /* Decommit the memory */
819 Status = ZwFreeVirtualMemory(NtCurrentProcess(),
820 (PVOID *)&DecommitBase,
821 &DecommitSize,
822 MEM_DECOMMIT);
823
824 /* Delete that UCR. This is needed to assure there is an unused UCR entry in the list */
825 RtlpDestroyUnCommittedRange(Segment, UcrDescriptor);
826
827 if (!NT_SUCCESS(Status))
828 {
829 RtlpInsertFreeBlock(Heap, FreeEntry, Size);
830 return;
831 }
832
833 /* Insert uncommitted pages */
834 RtlpInsertUnCommittedPages(Segment, DecommitBase, DecommitSize);
835 Segment->NumberOfUnCommittedPages += (ULONG)(DecommitSize / PAGE_SIZE);
836
837 if (PrecedingSize)
838 {
839 /* Adjust size of this free entry and insert it */
840 FreeEntry->Flags = HEAP_ENTRY_LAST_ENTRY;
841 FreeEntry->Size = (USHORT)PrecedingSize;
842 Heap->TotalFreeSize += PrecedingSize;
843
844 /* Insert it into the free list */
845 RtlpInsertFreeBlockHelper(Heap, FreeEntry, PrecedingSize, FALSE);
846 }
847 else if (PrecedingInUseEntry)
848 {
849 /* Adjust preceding in use entry */
850 PrecedingInUseEntry->Flags |= HEAP_ENTRY_LAST_ENTRY;
851 }
852
853 /* Now the next one */
854 if (NextSize)
855 {
856 /* Adjust size of this free entry and insert it */
857 NextFreeEntry->Flags = 0;
858 NextFreeEntry->PreviousSize = 0;
859 NextFreeEntry->SegmentOffset = Segment->Entry.SegmentOffset;
860 NextFreeEntry->Size = (USHORT)NextSize;
861
862 ((PHEAP_FREE_ENTRY)((PHEAP_ENTRY)NextFreeEntry + NextSize))->PreviousSize = (USHORT)NextSize;
863
864 Heap->TotalFreeSize += NextSize;
865 RtlpInsertFreeBlockHelper(Heap, NextFreeEntry, NextSize, FALSE);
866 }
867 else if (NextInUseEntry)
868 {
869 NextInUseEntry->PreviousSize = 0;
870 }
871 }
872
873 NTSTATUS
874 NTAPI
875 RtlpInitializeHeapSegment(IN OUT PHEAP Heap,
876 OUT PHEAP_SEGMENT Segment,
877 IN UCHAR SegmentIndex,
878 IN ULONG SegmentFlags,
879 IN SIZE_T SegmentReserve,
880 IN SIZE_T SegmentCommit)
881 {
882 PHEAP_ENTRY HeapEntry;
883
884 /* Preconditions */
885 ASSERT(Heap != NULL);
886 ASSERT(Segment != NULL);
887 ASSERT(SegmentCommit >= PAGE_SIZE);
888 ASSERT(ROUND_DOWN(SegmentCommit, PAGE_SIZE) == SegmentCommit);
889 ASSERT(SegmentReserve >= SegmentCommit);
890 ASSERT(ROUND_DOWN(SegmentReserve, PAGE_SIZE) == SegmentReserve);
891
892 DPRINT("RtlpInitializeHeapSegment(%p %p %x %x %lx %lx)\n", Heap, Segment, SegmentIndex, SegmentFlags, SegmentReserve, SegmentCommit);
893
894 /* Initialise the Heap Entry header if this is not the first Heap Segment */
895 if ((PHEAP_SEGMENT) (Heap) != Segment)
896 {
897 Segment->Entry.Size = ROUND_UP(sizeof(HEAP_SEGMENT), sizeof(HEAP_ENTRY)) >> HEAP_ENTRY_SHIFT;
898 Segment->Entry.Flags = HEAP_ENTRY_BUSY;
899 Segment->Entry.SmallTagIndex = LOBYTE(Segment->Entry.Size) ^ HIBYTE(Segment->Entry.Size) ^ Segment->Entry.Flags;
900 Segment->Entry.PreviousSize = 0;
901 Segment->Entry.SegmentOffset = SegmentIndex;
902 Segment->Entry.UnusedBytes = 0;
903 }
904
905 /* Sanity check */
906 ASSERT((Segment->Entry.Size << HEAP_ENTRY_SHIFT) <= PAGE_SIZE);
907
908 /* Initialise the Heap Segment header */
909 Segment->SegmentSignature = HEAP_SEGMENT_SIGNATURE;
910 Segment->SegmentFlags = SegmentFlags;
911 Segment->Heap = Heap;
912 Heap->Segments[SegmentIndex] = Segment;
913
914 /* Initialise the Heap Segment location information */
915 Segment->BaseAddress = Segment;
916 Segment->NumberOfPages = (ULONG)(SegmentReserve >> PAGE_SHIFT);
917
918 /* Initialise the Heap Entries contained within the Heap Segment */
919 Segment->FirstEntry = &Segment->Entry + Segment->Entry.Size;
920 Segment->LastValidEntry = (PHEAP_ENTRY)((ULONG_PTR)Segment + SegmentReserve);
921
922 if (((SIZE_T)Segment->Entry.Size << HEAP_ENTRY_SHIFT) < SegmentCommit)
923 {
924 HeapEntry = Segment->FirstEntry;
925
926 /* Prepare a Free Heap Entry header */
927 HeapEntry->Flags = HEAP_ENTRY_LAST_ENTRY;
928 HeapEntry->PreviousSize = Segment->Entry.Size;
929 HeapEntry->SegmentOffset = SegmentIndex;
930
931 /* Register the Free Heap Entry */
932 RtlpInsertFreeBlock(Heap, (PHEAP_FREE_ENTRY) HeapEntry, (SegmentCommit >> HEAP_ENTRY_SHIFT) - Segment->Entry.Size);
933 }
934
935 /* Initialise the Heap Segment UnCommitted Range information */
936 Segment->NumberOfUnCommittedPages = (ULONG)((SegmentReserve - SegmentCommit) >> PAGE_SHIFT);
937 Segment->NumberOfUnCommittedRanges = 0;
938 InitializeListHead(&Segment->UCRSegmentList);
939
940 /* Register the UnCommitted Range of the Heap Segment */
941 if (Segment->NumberOfUnCommittedPages != 0)
942 RtlpInsertUnCommittedPages(Segment, (ULONG_PTR) (Segment) + SegmentCommit, SegmentReserve - SegmentCommit);
943
944 return STATUS_SUCCESS;
945 }
946
947 VOID NTAPI
948 RtlpDestroyHeapSegment(PHEAP_SEGMENT Segment)
949 {
950 NTSTATUS Status;
951 PVOID BaseAddress;
952 SIZE_T Size = 0;
953
954 /* Make sure it's not user allocated */
955 if (Segment->SegmentFlags & HEAP_USER_ALLOCATED) return;
956
957 BaseAddress = Segment->BaseAddress;
958 DPRINT("Destroying segment %p, BA %p\n", Segment, BaseAddress);
959
960 /* Release virtual memory */
961 Status = ZwFreeVirtualMemory(NtCurrentProcess(),
962 &BaseAddress,
963 &Size,
964 MEM_RELEASE);
965
966 if (!NT_SUCCESS(Status))
967 {
968 DPRINT1("HEAP: Failed to release segment's memory with status 0x%08X\n", Status);
969 }
970 }
971
972 PHEAP_FREE_ENTRY NTAPI
973 RtlpCoalesceHeap(PHEAP Heap)
974 {
975 UNIMPLEMENTED;
976 return NULL;
977 }
978
979 PHEAP_FREE_ENTRY NTAPI
980 RtlpCoalesceFreeBlocks (PHEAP Heap,
981 PHEAP_FREE_ENTRY FreeEntry,
982 PSIZE_T FreeSize,
983 BOOLEAN Remove)
984 {
985 PHEAP_FREE_ENTRY CurrentEntry, NextEntry;
986
987 /* Get the previous entry */
988 CurrentEntry = (PHEAP_FREE_ENTRY)((PHEAP_ENTRY)FreeEntry - FreeEntry->PreviousSize);
989
990 /* Check it */
991 if (CurrentEntry != FreeEntry &&
992 !(CurrentEntry->Flags & HEAP_ENTRY_BUSY) &&
993 (*FreeSize + CurrentEntry->Size) <= HEAP_MAX_BLOCK_SIZE)
994 {
995 ASSERT(FreeEntry->PreviousSize == CurrentEntry->Size);
996
997 /* Remove it if asked for */
998 if (Remove)
999 {
1000 RtlpRemoveFreeBlock(Heap, FreeEntry, FALSE, FALSE);
1001 Heap->TotalFreeSize -= FreeEntry->Size;
1002
1003 /* Remove it only once! */
1004 Remove = FALSE;
1005 }
1006
1007 /* Remove previous entry too */
1008 RtlpRemoveFreeBlock(Heap, CurrentEntry, FALSE, FALSE);
1009
1010 /* Copy flags */
1011 CurrentEntry->Flags = FreeEntry->Flags & HEAP_ENTRY_LAST_ENTRY;
1012
1013 /* Advance FreeEntry and update sizes */
1014 FreeEntry = CurrentEntry;
1015 *FreeSize = *FreeSize + CurrentEntry->Size;
1016 Heap->TotalFreeSize -= CurrentEntry->Size;
1017 FreeEntry->Size = (USHORT)(*FreeSize);
1018
1019 /* Also update previous size if needed */
1020 if (!(FreeEntry->Flags & HEAP_ENTRY_LAST_ENTRY))
1021 {
1022 ((PHEAP_ENTRY)FreeEntry + *FreeSize)->PreviousSize = (USHORT)(*FreeSize);
1023 }
1024 }
1025
1026 /* Check the next block if it exists */
1027 if (!(FreeEntry->Flags & HEAP_ENTRY_LAST_ENTRY))
1028 {
1029 NextEntry = (PHEAP_FREE_ENTRY)((PHEAP_ENTRY)FreeEntry + *FreeSize);
1030
1031 if (!(NextEntry->Flags & HEAP_ENTRY_BUSY) &&
1032 NextEntry->Size + *FreeSize <= HEAP_MAX_BLOCK_SIZE)
1033 {
1034 ASSERT(*FreeSize == NextEntry->PreviousSize);
1035
1036 /* Remove it if asked for */
1037 if (Remove)
1038 {
1039 RtlpRemoveFreeBlock(Heap, FreeEntry, FALSE, FALSE);
1040 Heap->TotalFreeSize -= FreeEntry->Size;
1041 }
1042
1043 /* Copy flags */
1044 FreeEntry->Flags = NextEntry->Flags & HEAP_ENTRY_LAST_ENTRY;
1045
1046 /* Remove next entry now */
1047 RtlpRemoveFreeBlock(Heap, NextEntry, FALSE, FALSE);
1048
1049 /* Update sizes */
1050 *FreeSize = *FreeSize + NextEntry->Size;
1051 Heap->TotalFreeSize -= NextEntry->Size;
1052 FreeEntry->Size = (USHORT)(*FreeSize);
1053
1054 /* Also update previous size if needed */
1055 if (!(FreeEntry->Flags & HEAP_ENTRY_LAST_ENTRY))
1056 {
1057 ((PHEAP_ENTRY)FreeEntry + *FreeSize)->PreviousSize = (USHORT)(*FreeSize);
1058 }
1059 }
1060 }
1061 return FreeEntry;
1062 }
1063
1064 PHEAP_FREE_ENTRY NTAPI
1065 RtlpExtendHeap(PHEAP Heap,
1066 SIZE_T Size)
1067 {
1068 ULONG Pages;
1069 UCHAR Index, EmptyIndex;
1070 SIZE_T FreeSize, CommitSize, ReserveSize;
1071 PHEAP_SEGMENT Segment;
1072 PHEAP_FREE_ENTRY FreeEntry;
1073 NTSTATUS Status;
1074
1075 DPRINT("RtlpExtendHeap(%p %x)\n", Heap, Size);
1076
1077 /* Calculate amount in pages */
1078 Pages = (ULONG)((Size + PAGE_SIZE - 1) / PAGE_SIZE);
1079 FreeSize = Pages * PAGE_SIZE;
1080 DPRINT("Pages %x, FreeSize %x. Going through segments...\n", Pages, FreeSize);
1081
1082 /* Find an empty segment */
1083 EmptyIndex = HEAP_SEGMENTS;
1084 for (Index = 0; Index < HEAP_SEGMENTS; Index++)
1085 {
1086 Segment = Heap->Segments[Index];
1087
1088 if (Segment) DPRINT("Segment[%u] %p with NOUCP %x\n", Index, Segment, Segment->NumberOfUnCommittedPages);
1089
1090 /* Check if its size suits us */
1091 if (Segment &&
1092 Pages <= Segment->NumberOfUnCommittedPages)
1093 {
1094 DPRINT("This segment is suitable\n");
1095
1096 /* Commit needed amount */
1097 FreeEntry = RtlpFindAndCommitPages(Heap, Segment, &FreeSize, NULL);
1098
1099 /* Coalesce it with adjacent entries */
1100 if (FreeEntry)
1101 {
1102 FreeSize = FreeSize >> HEAP_ENTRY_SHIFT;
1103 FreeEntry = RtlpCoalesceFreeBlocks(Heap, FreeEntry, &FreeSize, FALSE);
1104 RtlpInsertFreeBlock(Heap, FreeEntry, FreeSize);
1105 return FreeEntry;
1106 }
1107 }
1108 else if (!Segment &&
1109 EmptyIndex == HEAP_SEGMENTS)
1110 {
1111 /* Remember the first unused segment index */
1112 EmptyIndex = Index;
1113 }
1114 }
1115
1116 /* No luck, need to grow the heap */
1117 if ((Heap->Flags & HEAP_GROWABLE) &&
1118 (EmptyIndex != HEAP_SEGMENTS))
1119 {
1120 Segment = NULL;
1121
1122 /* Reserve the memory */
1123 if ((Size + PAGE_SIZE) <= Heap->SegmentReserve)
1124 ReserveSize = Heap->SegmentReserve;
1125 else
1126 ReserveSize = Size + PAGE_SIZE;
1127
1128 Status = ZwAllocateVirtualMemory(NtCurrentProcess(),
1129 (PVOID)&Segment,
1130 0,
1131 &ReserveSize,
1132 MEM_RESERVE,
1133 PAGE_READWRITE);
1134
1135 /* If it failed, retry again with a half division algorithm */
1136 while (!NT_SUCCESS(Status) &&
1137 ReserveSize != Size + PAGE_SIZE)
1138 {
1139 ReserveSize /= 2;
1140
1141 if (ReserveSize < (Size + PAGE_SIZE))
1142 ReserveSize = Size + PAGE_SIZE;
1143
1144 Status = ZwAllocateVirtualMemory(NtCurrentProcess(),
1145 (PVOID)&Segment,
1146 0,
1147 &ReserveSize,
1148 MEM_RESERVE,
1149 PAGE_READWRITE);
1150 }
1151
1152 /* Proceed only if it's success */
1153 if (NT_SUCCESS(Status))
1154 {
1155 Heap->SegmentReserve += ReserveSize;
1156
1157 /* Now commit the memory */
1158 if ((Size + PAGE_SIZE) <= Heap->SegmentCommit)
1159 CommitSize = Heap->SegmentCommit;
1160 else
1161 CommitSize = Size + PAGE_SIZE;
1162
1163 Status = ZwAllocateVirtualMemory(NtCurrentProcess(),
1164 (PVOID)&Segment,
1165 0,
1166 &CommitSize,
1167 MEM_COMMIT,
1168 PAGE_READWRITE);
1169
1170 DPRINT("Committed %lu bytes at base %p\n", CommitSize, Segment);
1171
1172 /* Initialize heap segment if commit was successful */
1173 if (NT_SUCCESS(Status))
1174 Status = RtlpInitializeHeapSegment(Heap, Segment, EmptyIndex, 0, ReserveSize, CommitSize);
1175
1176 /* If everything worked - cool */
1177 if (NT_SUCCESS(Status)) return (PHEAP_FREE_ENTRY)Segment->FirstEntry;
1178
1179 DPRINT1("Committing failed with status 0x%08X\n", Status);
1180
1181 /* Nope, we failed. Free memory */
1182 ZwFreeVirtualMemory(NtCurrentProcess(),
1183 (PVOID)&Segment,
1184 &ReserveSize,
1185 MEM_RELEASE);
1186 }
1187 else
1188 {
1189 DPRINT1("Reserving failed with status 0x%08X\n", Status);
1190 }
1191 }
1192
1193 if (RtlpGetMode() == UserMode)
1194 {
1195 /* If coalescing on free is disabled in usermode, then do it here */
1196 if (Heap->Flags & HEAP_DISABLE_COALESCE_ON_FREE)
1197 {
1198 FreeEntry = RtlpCoalesceHeap(Heap);
1199
1200 /* If it's a suitable one - return it */
1201 if (FreeEntry &&
1202 FreeEntry->Size >= Size)
1203 {
1204 return FreeEntry;
1205 }
1206 }
1207 }
1208
1209 return NULL;
1210 }
1211
1212 /***********************************************************************
1213 * RtlCreateHeap
1214 * RETURNS
1215 * Handle of heap: Success
1216 * NULL: Failure
1217 *
1218 * @implemented
1219 */
1220 HANDLE NTAPI
1221 RtlCreateHeap(ULONG Flags,
1222 PVOID Addr,
1223 SIZE_T TotalSize,
1224 SIZE_T CommitSize,
1225 PVOID Lock,
1226 PRTL_HEAP_PARAMETERS Parameters)
1227 {
1228 PVOID CommittedAddress = NULL, UncommittedAddress = NULL;
1229 PHEAP Heap = NULL;
1230 RTL_HEAP_PARAMETERS SafeParams = {0};
1231 ULONG_PTR MaximumUserModeAddress;
1232 SYSTEM_BASIC_INFORMATION SystemInformation;
1233 MEMORY_BASIC_INFORMATION MemoryInfo;
1234 ULONG NtGlobalFlags = RtlGetNtGlobalFlags();
1235 ULONG HeapSegmentFlags = 0;
1236 NTSTATUS Status;
1237 ULONG MaxBlockSize;
1238
1239 /* Check for a special heap */
1240 if (RtlpPageHeapEnabled && !Addr && !Lock)
1241 {
1242 Heap = RtlpPageHeapCreate(Flags, Addr, TotalSize, CommitSize, Lock, Parameters);
1243 if (Heap) return Heap;
1244
1245 /* Reset a special Parameters == -1 hack */
1246 if ((ULONG_PTR)Parameters == (ULONG_PTR)-1)
1247 Parameters = NULL;
1248 else
1249 DPRINT1("Enabling page heap failed\n");
1250 }
1251
1252 /* Check validation flags */
1253 if (!(Flags & HEAP_SKIP_VALIDATION_CHECKS) && (Flags & ~HEAP_CREATE_VALID_MASK))
1254 {
1255 DPRINT1("Invalid flags 0x%08x, fixing...\n", Flags);
1256 Flags &= HEAP_CREATE_VALID_MASK;
1257 }
1258
1259 /* TODO: Capture parameters, once we decide to use SEH */
1260 if (!Parameters) Parameters = &SafeParams;
1261
1262 /* Check global flags */
1263 if (NtGlobalFlags & FLG_HEAP_DISABLE_COALESCING)
1264 Flags |= HEAP_DISABLE_COALESCE_ON_FREE;
1265
1266 if (NtGlobalFlags & FLG_HEAP_ENABLE_FREE_CHECK)
1267 Flags |= HEAP_FREE_CHECKING_ENABLED;
1268
1269 if (NtGlobalFlags & FLG_HEAP_ENABLE_TAIL_CHECK)
1270 Flags |= HEAP_TAIL_CHECKING_ENABLED;
1271
1272 if (RtlpGetMode() == UserMode)
1273 {
1274 /* Also check these flags if in usermode */
1275 if (NtGlobalFlags & FLG_HEAP_VALIDATE_ALL)
1276 Flags |= HEAP_VALIDATE_ALL_ENABLED;
1277
1278 if (NtGlobalFlags & FLG_HEAP_VALIDATE_PARAMETERS)
1279 Flags |= HEAP_VALIDATE_PARAMETERS_ENABLED;
1280
1281 if (NtGlobalFlags & FLG_USER_STACK_TRACE_DB)
1282 Flags |= HEAP_CAPTURE_STACK_BACKTRACES;
1283 }
1284
1285 /* Set tunable parameters */
1286 RtlpSetHeapParameters(Parameters);
1287
1288 /* Get the max um address */
1289 Status = ZwQuerySystemInformation(SystemBasicInformation,
1290 &SystemInformation,
1291 sizeof(SystemInformation),
1292 NULL);
1293
1294 if (!NT_SUCCESS(Status))
1295 {
1296 DPRINT1("Getting max usermode address failed with status 0x%08x\n", Status);
1297 return NULL;
1298 }
1299
1300 MaximumUserModeAddress = SystemInformation.MaximumUserModeAddress;
1301
1302 /* Calculate max alloc size */
1303 if (!Parameters->MaximumAllocationSize)
1304 Parameters->MaximumAllocationSize = MaximumUserModeAddress - (ULONG_PTR)0x10000 - PAGE_SIZE;
1305
1306 MaxBlockSize = 0x80000 - PAGE_SIZE;
1307
1308 if (!Parameters->VirtualMemoryThreshold ||
1309 Parameters->VirtualMemoryThreshold > MaxBlockSize)
1310 {
1311 Parameters->VirtualMemoryThreshold = MaxBlockSize;
1312 }
1313
1314 /* Check reserve/commit sizes and set default values */
1315 if (!CommitSize)
1316 {
1317 CommitSize = PAGE_SIZE;
1318 if (TotalSize)
1319 TotalSize = ROUND_UP(TotalSize, PAGE_SIZE);
1320 else
1321 TotalSize = 64 * PAGE_SIZE;
1322 }
1323 else
1324 {
1325 /* Round up the commit size to be at least the page size */
1326 CommitSize = ROUND_UP(CommitSize, PAGE_SIZE);
1327
1328 if (TotalSize)
1329 TotalSize = ROUND_UP(TotalSize, PAGE_SIZE);
1330 else
1331 TotalSize = ROUND_UP(CommitSize, 16 * PAGE_SIZE);
1332 }
1333
1334 /* Call special heap */
1335 if (RtlpHeapIsSpecial(Flags))
1336 return RtlDebugCreateHeap(Flags, Addr, TotalSize, CommitSize, Lock, Parameters);
1337
1338 /* Without serialization, a lock makes no sense */
1339 if ((Flags & HEAP_NO_SERIALIZE) && (Lock != NULL))
1340 return NULL;
1341
1342 /* See if we are already provided with an address for the heap */
1343 if (Addr)
1344 {
1345 if (Parameters->CommitRoutine)
1346 {
1347 /* There is a commit routine, so no problem here, check params */
1348 if ((Flags & HEAP_GROWABLE) ||
1349 !Parameters->InitialCommit ||
1350 !Parameters->InitialReserve ||
1351 (Parameters->InitialCommit > Parameters->InitialReserve))
1352 {
1353 /* Fail */
1354 return NULL;
1355 }
1356
1357 /* Calculate committed and uncommitted addresses */
1358 CommittedAddress = Addr;
1359 UncommittedAddress = (PCHAR)Addr + Parameters->InitialCommit;
1360 TotalSize = Parameters->InitialReserve;
1361
1362 /* Zero the initial page ourselves */
1363 RtlZeroMemory(CommittedAddress, PAGE_SIZE);
1364 }
1365 else
1366 {
1367 /* Commit routine is absent, so query how much memory caller reserved */
1368 Status = ZwQueryVirtualMemory(NtCurrentProcess(),
1369 Addr,
1370 MemoryBasicInformation,
1371 &MemoryInfo,
1372 sizeof(MemoryInfo),
1373 NULL);
1374
1375 if (!NT_SUCCESS(Status))
1376 {
1377 DPRINT1("Querying amount of user supplied memory failed with status 0x%08X\n", Status);
1378 return NULL;
1379 }
1380
1381 /* Validate it */
1382 if (MemoryInfo.BaseAddress != Addr ||
1383 MemoryInfo.State == MEM_FREE)
1384 {
1385 return NULL;
1386 }
1387
1388 /* Validation checks passed, set committed/uncommitted addresses */
1389 CommittedAddress = Addr;
1390
1391 /* Check if it's committed or not */
1392 if (MemoryInfo.State == MEM_COMMIT)
1393 {
1394 /* Zero it out because it's already committed */
1395 RtlZeroMemory(CommittedAddress, PAGE_SIZE);
1396
1397 /* Calculate uncommitted address value */
1398 CommitSize = MemoryInfo.RegionSize;
1399 TotalSize = CommitSize;
1400 UncommittedAddress = (PCHAR)Addr + CommitSize;
1401
1402 /* Check if uncommitted address is reserved */
1403 Status = ZwQueryVirtualMemory(NtCurrentProcess(),
1404 UncommittedAddress,
1405 MemoryBasicInformation,
1406 &MemoryInfo,
1407 sizeof(MemoryInfo),
1408 NULL);
1409
1410 if (NT_SUCCESS(Status) &&
1411 MemoryInfo.State == MEM_RESERVE)
1412 {
1413 /* It is, so add it up to the reserve size */
1414 TotalSize += MemoryInfo.RegionSize;
1415 }
1416 }
1417 else
1418 {
1419 /* It's not committed, inform following code that a commit is necessary */
1420 CommitSize = PAGE_SIZE;
1421 UncommittedAddress = Addr;
1422 }
1423 }
1424
1425 /* Mark this as a user-committed mem */
1426 HeapSegmentFlags = HEAP_USER_ALLOCATED;
1427 Heap = (PHEAP)Addr;
1428 }
1429 else
1430 {
1431 /* Check commit routine */
1432 if (Parameters->CommitRoutine) return NULL;
1433
1434 /* Reserve memory */
1435 Status = ZwAllocateVirtualMemory(NtCurrentProcess(),
1436 (PVOID *)&Heap,
1437 0,
1438 &TotalSize,
1439 MEM_RESERVE,
1440 PAGE_READWRITE);
1441
1442 if (!NT_SUCCESS(Status))
1443 {
1444 DPRINT1("Failed to reserve memory with status 0x%08x\n", Status);
1445 return NULL;
1446 }
1447
1448 /* Set base addresses */
1449 CommittedAddress = Heap;
1450 UncommittedAddress = Heap;
1451 }
1452
1453 /* Check if we need to commit something */
1454 if (CommittedAddress == UncommittedAddress)
1455 {
1456 /* Commit the required size */
1457 Status = ZwAllocateVirtualMemory(NtCurrentProcess(),
1458 &CommittedAddress,
1459 0,
1460 &CommitSize,
1461 MEM_COMMIT,
1462 PAGE_READWRITE);
1463
1464 DPRINT("Committed %Iu bytes at base %p\n", CommitSize, CommittedAddress);
1465
1466 if (!NT_SUCCESS(Status))
1467 {
1468 DPRINT1("Failure, Status 0x%08X\n", Status);
1469
1470 /* Release memory if it was reserved */
1471 if (!Addr) ZwFreeVirtualMemory(NtCurrentProcess(),
1472 (PVOID *)&Heap,
1473 &TotalSize,
1474 MEM_RELEASE);
1475
1476 return NULL;
1477 }
1478
1479 /* Calculate new uncommitted address */
1480 UncommittedAddress = (PCHAR)UncommittedAddress + CommitSize;
1481 }
1482
1483 /* Initialize the heap */
1484 Status = RtlpInitializeHeap(Heap, Flags, Lock, Parameters);
1485 if (!NT_SUCCESS(Status))
1486 {
1487 DPRINT1("Failed to initialize heap (%x)\n", Status);
1488 return NULL;
1489 }
1490
1491 /* Initialize heap's first segment */
1492 Status = RtlpInitializeHeapSegment(Heap, (PHEAP_SEGMENT) (Heap), 0, HeapSegmentFlags, TotalSize, CommitSize);
1493 if (!NT_SUCCESS(Status))
1494 {
1495 DPRINT1("Failed to initialize heap segment (%x)\n", Status);
1496 return NULL;
1497 }
1498
1499 DPRINT("Created heap %p, CommitSize %x, ReserveSize %x\n", Heap, CommitSize, TotalSize);
1500
1501 /* Add heap to process list in case of usermode heap */
1502 if (RtlpGetMode() == UserMode)
1503 {
1504 RtlpAddHeapToProcessList(Heap);
1505
1506 // FIXME: What about lookasides?
1507 }
1508
1509 return Heap;
1510 }
1511
1512 /***********************************************************************
1513 * RtlDestroyHeap
1514 * RETURNS
1515 * TRUE: Success
1516 * FALSE: Failure
1517 *
1518 * @implemented
1519 *
1520 * RETURNS
1521 * Success: A NULL HANDLE, if heap is NULL or it was destroyed
1522 * Failure: The Heap handle, if heap is the process heap.
1523 */
1524 HANDLE NTAPI
1525 RtlDestroyHeap(HANDLE HeapPtr) /* [in] Handle of heap */
1526 {
1527 PHEAP Heap = (PHEAP)HeapPtr;
1528 PLIST_ENTRY Current;
1529 PHEAP_UCR_SEGMENT UcrSegment;
1530 PHEAP_VIRTUAL_ALLOC_ENTRY VirtualEntry;
1531 PVOID BaseAddress;
1532 SIZE_T Size;
1533 LONG i;
1534 PHEAP_SEGMENT Segment;
1535
1536 if (!HeapPtr) return NULL;
1537
1538 /* Call page heap routine if required */
1539 if (Heap->ForceFlags & HEAP_FLAG_PAGE_ALLOCS) return RtlpPageHeapDestroy(HeapPtr);
1540
1541 /* Call special heap */
1542 if (RtlpHeapIsSpecial(Heap->Flags))
1543 {
1544 if (!RtlDebugDestroyHeap(Heap)) return HeapPtr;
1545 }
1546
1547 /* Check for a process heap */
1548 if (RtlpGetMode() == UserMode &&
1549 HeapPtr == NtCurrentPeb()->ProcessHeap) return HeapPtr;
1550
1551 /* Free up all big allocations */
1552 Current = Heap->VirtualAllocdBlocks.Flink;
1553 while (Current != &Heap->VirtualAllocdBlocks)
1554 {
1555 VirtualEntry = CONTAINING_RECORD(Current, HEAP_VIRTUAL_ALLOC_ENTRY, Entry);
1556 BaseAddress = (PVOID)VirtualEntry;
1557 Current = Current->Flink;
1558 Size = 0;
1559 ZwFreeVirtualMemory(NtCurrentProcess(),
1560 &BaseAddress,
1561 &Size,
1562 MEM_RELEASE);
1563 }
1564
1565 /* Delete tags and remove heap from the process heaps list in user mode */
1566 if (RtlpGetMode() == UserMode)
1567 {
1568 // FIXME DestroyTags
1569 RtlpRemoveHeapFromProcessList(Heap);
1570 }
1571
1572 /* Delete the heap lock */
1573 if (!(Heap->Flags & HEAP_NO_SERIALIZE))
1574 {
1575 /* Delete it if it wasn't user allocated */
1576 if (!(Heap->Flags & HEAP_LOCK_USER_ALLOCATED))
1577 RtlDeleteHeapLock(Heap->LockVariable);
1578
1579 /* Clear out the lock variable */
1580 Heap->LockVariable = NULL;
1581 }
1582
1583 /* Free UCR segments if any were created */
1584 Current = Heap->UCRSegments.Flink;
1585 while (Current != &Heap->UCRSegments)
1586 {
1587 UcrSegment = CONTAINING_RECORD(Current, HEAP_UCR_SEGMENT, ListEntry);
1588
1589 /* Advance to the next descriptor */
1590 Current = Current->Flink;
1591
1592 BaseAddress = (PVOID)UcrSegment;
1593 Size = 0;
1594
1595 /* Release that memory */
1596 ZwFreeVirtualMemory(NtCurrentProcess(),
1597 &BaseAddress,
1598 &Size,
1599 MEM_RELEASE);
1600 }
1601
1602 /* Go through segments and destroy them */
1603 for (i = HEAP_SEGMENTS - 1; i >= 0; i--)
1604 {
1605 Segment = Heap->Segments[i];
1606 if (Segment) RtlpDestroyHeapSegment(Segment);
1607 }
1608
1609 return NULL;
1610 }
1611
1612 PHEAP_ENTRY NTAPI
1613 RtlpSplitEntry(PHEAP Heap,
1614 ULONG Flags,
1615 PHEAP_FREE_ENTRY FreeBlock,
1616 SIZE_T AllocationSize,
1617 SIZE_T Index,
1618 SIZE_T Size)
1619 {
1620 PHEAP_FREE_ENTRY SplitBlock, SplitBlock2;
1621 UCHAR FreeFlags, EntryFlags = HEAP_ENTRY_BUSY;
1622 PHEAP_ENTRY InUseEntry;
1623 SIZE_T FreeSize;
1624
1625 /* Add extra flags in case of settable user value feature is requested,
1626 or there is a tag (small or normal) or there is a request to
1627 capture stack backtraces */
1628 if ((Flags & HEAP_EXTRA_FLAGS_MASK) ||
1629 Heap->PseudoTagEntries)
1630 {
1631 /* Add flag which means that the entry will have extra stuff attached */
1632 EntryFlags |= HEAP_ENTRY_EXTRA_PRESENT;
1633
1634 /* NB! AllocationSize is already adjusted by RtlAllocateHeap */
1635 }
1636
1637 /* Add settable user flags, if any */
1638 EntryFlags |= (Flags & HEAP_SETTABLE_USER_FLAGS) >> 4;
1639
1640 /* Save flags, update total free size */
1641 FreeFlags = FreeBlock->Flags;
1642 Heap->TotalFreeSize -= FreeBlock->Size;
1643
1644 /* Make this block an in-use one */
1645 InUseEntry = (PHEAP_ENTRY)FreeBlock;
1646 InUseEntry->Flags = EntryFlags;
1647 InUseEntry->SmallTagIndex = 0;
1648
1649 /* Calculate the extra amount */
1650 FreeSize = InUseEntry->Size - Index;
1651
1652 /* Update it's size fields (we don't need their data anymore) */
1653 InUseEntry->Size = (USHORT)Index;
1654 InUseEntry->UnusedBytes = (UCHAR)(AllocationSize - Size);
1655
1656 /* If there is something to split - do the split */
1657 if (FreeSize != 0)
1658 {
1659 /* Don't split if resulting entry can't contain any payload data
1660 (i.e. being just HEAP_ENTRY_SIZE) */
1661 if (FreeSize == 1)
1662 {
1663 /* Increase sizes of the in-use entry */
1664 InUseEntry->Size++;
1665 InUseEntry->UnusedBytes += sizeof(HEAP_ENTRY);
1666 }
1667 else
1668 {
1669 /* Calculate a pointer to the new entry */
1670 SplitBlock = (PHEAP_FREE_ENTRY)(InUseEntry + Index);
1671
1672 /* Initialize it */
1673 SplitBlock->Flags = FreeFlags;
1674 SplitBlock->SegmentOffset = InUseEntry->SegmentOffset;
1675 SplitBlock->Size = (USHORT)FreeSize;
1676 SplitBlock->PreviousSize = (USHORT)Index;
1677
1678 /* Check if it's the last entry */
1679 if (FreeFlags & HEAP_ENTRY_LAST_ENTRY)
1680 {
1681 /* Insert it to the free list if it's the last entry */
1682 RtlpInsertFreeBlockHelper(Heap, SplitBlock, FreeSize, FALSE);
1683 Heap->TotalFreeSize += FreeSize;
1684 }
1685 else
1686 {
1687 /* Not so easy - need to update next's previous size too */
1688 SplitBlock2 = (PHEAP_FREE_ENTRY)((PHEAP_ENTRY)SplitBlock + FreeSize);
1689
1690 if (SplitBlock2->Flags & HEAP_ENTRY_BUSY)
1691 {
1692 SplitBlock2->PreviousSize = (USHORT)FreeSize;
1693 RtlpInsertFreeBlockHelper(Heap, SplitBlock, FreeSize, FALSE);
1694 Heap->TotalFreeSize += FreeSize;
1695 }
1696 else
1697 {
1698 /* Even more complex - the next entry is free, so we can merge them into one! */
1699 SplitBlock->Flags = SplitBlock2->Flags;
1700
1701 /* Remove that next entry */
1702 RtlpRemoveFreeBlock(Heap, SplitBlock2, FALSE, FALSE);
1703
1704 /* Update sizes */
1705 FreeSize += SplitBlock2->Size;
1706 Heap->TotalFreeSize -= SplitBlock2->Size;
1707
1708 if (FreeSize <= HEAP_MAX_BLOCK_SIZE)
1709 {
1710 /* Insert it back */
1711 SplitBlock->Size = (USHORT)FreeSize;
1712
1713 /* Don't forget to update previous size of the next entry! */
1714 if (!(SplitBlock->Flags & HEAP_ENTRY_LAST_ENTRY))
1715 {
1716 ((PHEAP_FREE_ENTRY)((PHEAP_ENTRY)SplitBlock + FreeSize))->PreviousSize = (USHORT)FreeSize;
1717 }
1718
1719 /* Actually insert it */
1720 RtlpInsertFreeBlockHelper(Heap, SplitBlock, (USHORT)FreeSize, FALSE);
1721
1722 /* Update total size */
1723 Heap->TotalFreeSize += FreeSize;
1724 }
1725 else
1726 {
1727 /* Resulting block is quite big */
1728 RtlpInsertFreeBlock(Heap, SplitBlock, FreeSize);
1729 }
1730 }
1731 }
1732
1733 /* Reset flags of the free entry */
1734 FreeFlags = 0;
1735 }
1736 }
1737
1738 /* Set last entry flag */
1739 if (FreeFlags & HEAP_ENTRY_LAST_ENTRY)
1740 InUseEntry->Flags |= HEAP_ENTRY_LAST_ENTRY;
1741
1742 return InUseEntry;
1743 }
1744
1745 PVOID NTAPI
1746 RtlpAllocateNonDedicated(PHEAP Heap,
1747 ULONG Flags,
1748 SIZE_T Size,
1749 SIZE_T AllocationSize,
1750 SIZE_T Index,
1751 BOOLEAN HeapLocked)
1752 {
1753 PLIST_ENTRY FreeListHead, Next;
1754 PHEAP_FREE_ENTRY FreeBlock;
1755 PHEAP_ENTRY InUseEntry;
1756 PHEAP_ENTRY_EXTRA Extra;
1757 EXCEPTION_RECORD ExceptionRecord;
1758
1759 /* Go through the zero list to find a place where to insert the new entry */
1760 FreeListHead = &Heap->FreeLists[0];
1761
1762 /* Start from the largest block to reduce time */
1763 Next = FreeListHead->Blink;
1764 if (FreeListHead != Next)
1765 {
1766 FreeBlock = CONTAINING_RECORD(Next, HEAP_FREE_ENTRY, FreeList);
1767
1768 if (FreeBlock->Size >= Index)
1769 {
1770 /* Our request is smaller than the largest entry in the zero list */
1771
1772 /* Go through the list to find insertion place */
1773 Next = FreeListHead->Flink;
1774 while (FreeListHead != Next)
1775 {
1776 FreeBlock = CONTAINING_RECORD(Next, HEAP_FREE_ENTRY, FreeList);
1777
1778 if (FreeBlock->Size >= Index)
1779 {
1780 /* Found minimally fitting entry. Proceed to either using it as it is
1781 or splitting it to two entries */
1782 RemoveEntryList(&FreeBlock->FreeList);
1783
1784 /* Split it */
1785 InUseEntry = RtlpSplitEntry(Heap, Flags, FreeBlock, AllocationSize, Index, Size);
1786
1787 /* Release the lock */
1788 if (HeapLocked) RtlLeaveHeapLock(Heap->LockVariable);
1789
1790 /* Zero memory if that was requested */
1791 if (Flags & HEAP_ZERO_MEMORY)
1792 RtlZeroMemory(InUseEntry + 1, Size);
1793 else if (Heap->Flags & HEAP_FREE_CHECKING_ENABLED)
1794 {
1795 /* Fill this block with a special pattern */
1796 RtlFillMemoryUlong(InUseEntry + 1, Size & ~0x3, ARENA_INUSE_FILLER);
1797 }
1798
1799 /* Fill tail of the block with a special pattern too if requested */
1800 if (Heap->Flags & HEAP_TAIL_CHECKING_ENABLED)
1801 {
1802 RtlFillMemory((PCHAR)(InUseEntry + 1) + Size, sizeof(HEAP_ENTRY), HEAP_TAIL_FILL);
1803 InUseEntry->Flags |= HEAP_ENTRY_FILL_PATTERN;
1804 }
1805
1806 /* Prepare extra if it's present */
1807 if (InUseEntry->Flags & HEAP_ENTRY_EXTRA_PRESENT)
1808 {
1809 Extra = RtlpGetExtraStuffPointer(InUseEntry);
1810 RtlZeroMemory(Extra, sizeof(HEAP_ENTRY_EXTRA));
1811
1812 // TODO: Tagging
1813 }
1814
1815 /* Return pointer to the */
1816 return InUseEntry + 1;
1817 }
1818
1819 /* Advance to the next entry */
1820 Next = Next->Flink;
1821 }
1822 }
1823 }
1824
1825 /* Extend the heap, 0 list didn't have anything suitable */
1826 FreeBlock = RtlpExtendHeap(Heap, AllocationSize);
1827
1828 /* Use the new biggest entry we've got */
1829 if (FreeBlock)
1830 {
1831 RemoveEntryList(&FreeBlock->FreeList);
1832
1833 /* Split it */
1834 InUseEntry = RtlpSplitEntry(Heap, Flags, FreeBlock, AllocationSize, Index, Size);
1835
1836 /* Release the lock */
1837 if (HeapLocked) RtlLeaveHeapLock(Heap->LockVariable);
1838
1839 /* Zero memory if that was requested */
1840 if (Flags & HEAP_ZERO_MEMORY)
1841 RtlZeroMemory(InUseEntry + 1, Size);
1842 else if (Heap->Flags & HEAP_FREE_CHECKING_ENABLED)
1843 {
1844 /* Fill this block with a special pattern */
1845 RtlFillMemoryUlong(InUseEntry + 1, Size & ~0x3, ARENA_INUSE_FILLER);
1846 }
1847
1848 /* Fill tail of the block with a special pattern too if requested */
1849 if (Heap->Flags & HEAP_TAIL_CHECKING_ENABLED)
1850 {
1851 RtlFillMemory((PCHAR)(InUseEntry + 1) + Size, sizeof(HEAP_ENTRY), HEAP_TAIL_FILL);
1852 InUseEntry->Flags |= HEAP_ENTRY_FILL_PATTERN;
1853 }
1854
1855 /* Prepare extra if it's present */
1856 if (InUseEntry->Flags & HEAP_ENTRY_EXTRA_PRESENT)
1857 {
1858 Extra = RtlpGetExtraStuffPointer(InUseEntry);
1859 RtlZeroMemory(Extra, sizeof(HEAP_ENTRY_EXTRA));
1860
1861 // TODO: Tagging
1862 }
1863
1864 /* Return pointer to the */
1865 return InUseEntry + 1;
1866 }
1867
1868 /* Really unfortunate, out of memory condition */
1869 RtlSetLastWin32ErrorAndNtStatusFromNtStatus(STATUS_NO_MEMORY);
1870
1871 /* Generate an exception */
1872 if (Flags & HEAP_GENERATE_EXCEPTIONS)
1873 {
1874 ExceptionRecord.ExceptionCode = STATUS_NO_MEMORY;
1875 ExceptionRecord.ExceptionRecord = NULL;
1876 ExceptionRecord.NumberParameters = 1;
1877 ExceptionRecord.ExceptionFlags = 0;
1878 ExceptionRecord.ExceptionInformation[0] = AllocationSize;
1879
1880 RtlRaiseException(&ExceptionRecord);
1881 }
1882
1883 /* Release the lock */
1884 if (HeapLocked) RtlLeaveHeapLock(Heap->LockVariable);
1885 DPRINT1("HEAP: Allocation failed!\n");
1886 DPRINT1("Flags %x\n", Heap->Flags);
1887 return NULL;
1888 }
1889
1890 /***********************************************************************
1891 * HeapAlloc (KERNEL32.334)
1892 * RETURNS
1893 * Pointer to allocated memory block
1894 * NULL: Failure
1895 * 0x7d030f60--invalid flags in RtlHeapAllocate
1896 * @implemented
1897 */
1898 PVOID NTAPI
1899 RtlAllocateHeap(IN PVOID HeapPtr,
1900 IN ULONG Flags,
1901 IN SIZE_T Size)
1902 {
1903 PHEAP Heap = (PHEAP)HeapPtr;
1904 PULONG FreeListsInUse;
1905 ULONG FreeListsInUseUlong;
1906 SIZE_T AllocationSize;
1907 SIZE_T Index, InUseIndex, i;
1908 PLIST_ENTRY FreeListHead;
1909 PHEAP_ENTRY InUseEntry;
1910 PHEAP_FREE_ENTRY FreeBlock;
1911 UCHAR FreeFlags, EntryFlags = HEAP_ENTRY_BUSY;
1912 EXCEPTION_RECORD ExceptionRecord;
1913 BOOLEAN HeapLocked = FALSE;
1914 PHEAP_VIRTUAL_ALLOC_ENTRY VirtualBlock = NULL;
1915 PHEAP_ENTRY_EXTRA Extra;
1916 NTSTATUS Status;
1917
1918 /* Force flags */
1919 Flags |= Heap->ForceFlags;
1920
1921 /* Call special heap */
1922 if (RtlpHeapIsSpecial(Flags))
1923 return RtlDebugAllocateHeap(Heap, Flags, Size);
1924
1925 /* Check for the maximum size */
1926 if (Size >= 0x80000000)
1927 {
1928 RtlSetLastWin32ErrorAndNtStatusFromNtStatus(STATUS_NO_MEMORY);
1929 DPRINT1("HEAP: Allocation failed!\n");
1930 return NULL;
1931 }
1932
1933 if (Flags & (HEAP_CREATE_ENABLE_TRACING))
1934 {
1935 DPRINT1("HEAP: RtlAllocateHeap is called with unsupported flags %x, ignoring\n", Flags);
1936 }
1937
1938 //DPRINT("RtlAllocateHeap(%p %x %x)\n", Heap, Flags, Size);
1939
1940 /* Calculate allocation size and index */
1941 if (Size)
1942 AllocationSize = Size;
1943 else
1944 AllocationSize = 1;
1945 AllocationSize = (AllocationSize + Heap->AlignRound) & Heap->AlignMask;
1946
1947 /* Add extra flags in case of settable user value feature is requested,
1948 or there is a tag (small or normal) or there is a request to
1949 capture stack backtraces */
1950 if ((Flags & HEAP_EXTRA_FLAGS_MASK) ||
1951 Heap->PseudoTagEntries)
1952 {
1953 /* Add flag which means that the entry will have extra stuff attached */
1954 EntryFlags |= HEAP_ENTRY_EXTRA_PRESENT;
1955
1956 /* Account for extra stuff size */
1957 AllocationSize += sizeof(HEAP_ENTRY_EXTRA);
1958 }
1959
1960 /* Add settable user flags, if any */
1961 EntryFlags |= (Flags & HEAP_SETTABLE_USER_FLAGS) >> 4;
1962
1963 Index = AllocationSize >> HEAP_ENTRY_SHIFT;
1964
1965 /* Acquire the lock if necessary */
1966 if (!(Flags & HEAP_NO_SERIALIZE))
1967 {
1968 RtlEnterHeapLock(Heap->LockVariable, TRUE);
1969 HeapLocked = TRUE;
1970 }
1971
1972 /* Depending on the size, the allocation is going to be done from dedicated,
1973 non-dedicated lists or a virtual block of memory */
1974 if (Index < HEAP_FREELISTS)
1975 {
1976 FreeListHead = &Heap->FreeLists[Index];
1977
1978 if (!IsListEmpty(FreeListHead))
1979 {
1980 /* There is a free entry in this list */
1981 FreeBlock = CONTAINING_RECORD(FreeListHead->Blink,
1982 HEAP_FREE_ENTRY,
1983 FreeList);
1984
1985 /* Save flags and remove the free entry */
1986 FreeFlags = FreeBlock->Flags;
1987 RtlpRemoveFreeBlock(Heap, FreeBlock, TRUE, FALSE);
1988
1989 /* Update the total free size of the heap */
1990 Heap->TotalFreeSize -= Index;
1991
1992 /* Initialize this block */
1993 InUseEntry = (PHEAP_ENTRY)FreeBlock;
1994 InUseEntry->Flags = EntryFlags | (FreeFlags & HEAP_ENTRY_LAST_ENTRY);
1995 InUseEntry->UnusedBytes = (UCHAR)(AllocationSize - Size);
1996 InUseEntry->SmallTagIndex = 0;
1997 }
1998 else
1999 {
2000 /* Find smallest free block which this request could fit in */
2001 InUseIndex = Index >> 5;
2002 FreeListsInUse = &Heap->u.FreeListsInUseUlong[InUseIndex];
2003
2004 /* This bit magic disables all sizes which are less than the requested allocation size */
2005 FreeListsInUseUlong = *FreeListsInUse++ & ~((1 << ((ULONG)Index & 0x1f)) - 1);
2006
2007 /* If size is definitily more than our lists - go directly to the non-dedicated one */
2008 if (InUseIndex > 3)
2009 return RtlpAllocateNonDedicated(Heap, Flags, Size, AllocationSize, Index, HeapLocked);
2010
2011 /* Go through the list */
2012 for (i = InUseIndex; i < 4; i++)
2013 {
2014 if (FreeListsInUseUlong)
2015 {
2016 FreeListHead = &Heap->FreeLists[i * 32];
2017 break;
2018 }
2019
2020 if (i < 3) FreeListsInUseUlong = *FreeListsInUse++;
2021 }
2022
2023 /* Nothing found, search in the non-dedicated list */
2024 if (i == 4)
2025 return RtlpAllocateNonDedicated(Heap, Flags, Size, AllocationSize, Index, HeapLocked);
2026
2027 /* That list is found, now calculate exact block */
2028 FreeListHead += RtlpFindLeastSetBit(FreeListsInUseUlong);
2029
2030 /* Take this entry and remove it from the list of free blocks */
2031 FreeBlock = CONTAINING_RECORD(FreeListHead->Blink,
2032 HEAP_FREE_ENTRY,
2033 FreeList);
2034 RtlpRemoveFreeBlock(Heap, FreeBlock, TRUE, FALSE);
2035
2036 /* Split it */
2037 InUseEntry = RtlpSplitEntry(Heap, Flags, FreeBlock, AllocationSize, Index, Size);
2038 }
2039
2040 /* Release the lock */
2041 if (HeapLocked) RtlLeaveHeapLock(Heap->LockVariable);
2042
2043 /* Zero memory if that was requested */
2044 if (Flags & HEAP_ZERO_MEMORY)
2045 RtlZeroMemory(InUseEntry + 1, Size);
2046 else if (Heap->Flags & HEAP_FREE_CHECKING_ENABLED)
2047 {
2048 /* Fill this block with a special pattern */
2049 RtlFillMemoryUlong(InUseEntry + 1, Size & ~0x3, ARENA_INUSE_FILLER);
2050 }
2051
2052 /* Fill tail of the block with a special pattern too if requested */
2053 if (Heap->Flags & HEAP_TAIL_CHECKING_ENABLED)
2054 {
2055 RtlFillMemory((PCHAR)(InUseEntry + 1) + Size, sizeof(HEAP_ENTRY), HEAP_TAIL_FILL);
2056 InUseEntry->Flags |= HEAP_ENTRY_FILL_PATTERN;
2057 }
2058
2059 /* Prepare extra if it's present */
2060 if (InUseEntry->Flags & HEAP_ENTRY_EXTRA_PRESENT)
2061 {
2062 Extra = RtlpGetExtraStuffPointer(InUseEntry);
2063 RtlZeroMemory(Extra, sizeof(HEAP_ENTRY_EXTRA));
2064
2065 // TODO: Tagging
2066 }
2067
2068 /* User data starts right after the entry's header */
2069 return InUseEntry + 1;
2070 }
2071 else if (Index <= Heap->VirtualMemoryThreshold)
2072 {
2073 /* The block is too large for dedicated lists, but fine for a non-dedicated one */
2074 return RtlpAllocateNonDedicated(Heap, Flags, Size, AllocationSize, Index, HeapLocked);
2075 }
2076 else if (Heap->Flags & HEAP_GROWABLE)
2077 {
2078 /* We've got a very big allocation request, satisfy it by directly allocating virtual memory */
2079 AllocationSize += sizeof(HEAP_VIRTUAL_ALLOC_ENTRY) - sizeof(HEAP_ENTRY);
2080
2081 Status = ZwAllocateVirtualMemory(NtCurrentProcess(),
2082 (PVOID *)&VirtualBlock,
2083 0,
2084 &AllocationSize,
2085 MEM_COMMIT,
2086 PAGE_READWRITE);
2087
2088 if (!NT_SUCCESS(Status))
2089 {
2090 // Set STATUS!
2091 /* Release the lock */
2092 if (HeapLocked) RtlLeaveHeapLock(Heap->LockVariable);
2093 DPRINT1("HEAP: Allocation failed!\n");
2094 return NULL;
2095 }
2096
2097 /* Initialize the newly allocated block */
2098 VirtualBlock->BusyBlock.Size = (USHORT)(AllocationSize - Size);
2099 ASSERT(VirtualBlock->BusyBlock.Size >= sizeof(HEAP_VIRTUAL_ALLOC_ENTRY));
2100 VirtualBlock->BusyBlock.Flags = EntryFlags | HEAP_ENTRY_VIRTUAL_ALLOC | HEAP_ENTRY_EXTRA_PRESENT;
2101 VirtualBlock->CommitSize = AllocationSize;
2102 VirtualBlock->ReserveSize = AllocationSize;
2103
2104 /* Insert it into the list of virtual allocations */
2105 InsertTailList(&Heap->VirtualAllocdBlocks, &VirtualBlock->Entry);
2106
2107 /* Release the lock */
2108 if (HeapLocked) RtlLeaveHeapLock(Heap->LockVariable);
2109
2110 /* Return pointer to user data */
2111 return VirtualBlock + 1;
2112 }
2113
2114 /* Generate an exception */
2115 if (Flags & HEAP_GENERATE_EXCEPTIONS)
2116 {
2117 ExceptionRecord.ExceptionCode = STATUS_NO_MEMORY;
2118 ExceptionRecord.ExceptionRecord = NULL;
2119 ExceptionRecord.NumberParameters = 1;
2120 ExceptionRecord.ExceptionFlags = 0;
2121 ExceptionRecord.ExceptionInformation[0] = AllocationSize;
2122
2123 RtlRaiseException(&ExceptionRecord);
2124 }
2125
2126 RtlSetLastWin32ErrorAndNtStatusFromNtStatus(STATUS_BUFFER_TOO_SMALL);
2127
2128 /* Release the lock */
2129 if (HeapLocked) RtlLeaveHeapLock(Heap->LockVariable);
2130 DPRINT1("HEAP: Allocation failed!\n");
2131 return NULL;
2132 }
2133
2134
2135 /***********************************************************************
2136 * HeapFree (KERNEL32.338)
2137 * RETURNS
2138 * TRUE: Success
2139 * FALSE: Failure
2140 *
2141 * @implemented
2142 */
2143 BOOLEAN NTAPI RtlFreeHeap(
2144 HANDLE HeapPtr, /* [in] Handle of heap */
2145 ULONG Flags, /* [in] Heap freeing flags */
2146 PVOID Ptr /* [in] Address of memory to free */
2147 )
2148 {
2149 PHEAP Heap;
2150 PHEAP_ENTRY HeapEntry;
2151 USHORT TagIndex = 0;
2152 SIZE_T BlockSize;
2153 PHEAP_VIRTUAL_ALLOC_ENTRY VirtualEntry;
2154 BOOLEAN Locked = FALSE;
2155 NTSTATUS Status;
2156
2157 /* Freeing NULL pointer is a legal operation */
2158 if (!Ptr) return TRUE;
2159
2160 /* Get pointer to the heap and force flags */
2161 Heap = (PHEAP)HeapPtr;
2162 Flags |= Heap->ForceFlags;
2163
2164 /* Call special heap */
2165 if (RtlpHeapIsSpecial(Flags))
2166 return RtlDebugFreeHeap(Heap, Flags, Ptr);
2167
2168 /* Lock if necessary */
2169 if (!(Flags & HEAP_NO_SERIALIZE))
2170 {
2171 RtlEnterHeapLock(Heap->LockVariable, TRUE);
2172 Locked = TRUE;
2173 }
2174
2175 /* Get pointer to the heap entry */
2176 HeapEntry = (PHEAP_ENTRY)Ptr - 1;
2177
2178 /* Check this entry, fail if it's invalid */
2179 if (!(HeapEntry->Flags & HEAP_ENTRY_BUSY) ||
2180 (((ULONG_PTR)Ptr & 0x7) != 0) ||
2181 (HeapEntry->SegmentOffset >= HEAP_SEGMENTS))
2182 {
2183 /* This is an invalid block */
2184 DPRINT1("HEAP: Trying to free an invalid address %p!\n", Ptr);
2185 RtlSetLastWin32ErrorAndNtStatusFromNtStatus(STATUS_INVALID_PARAMETER);
2186
2187 /* Release the heap lock */
2188 if (Locked) RtlLeaveHeapLock(Heap->LockVariable);
2189 return FALSE;
2190 }
2191
2192 if (HeapEntry->Flags & HEAP_ENTRY_VIRTUAL_ALLOC)
2193 {
2194 /* Big allocation */
2195 VirtualEntry = CONTAINING_RECORD(HeapEntry, HEAP_VIRTUAL_ALLOC_ENTRY, BusyBlock);
2196
2197 /* Remove it from the list */
2198 RemoveEntryList(&VirtualEntry->Entry);
2199
2200 // TODO: Tagging
2201
2202 BlockSize = 0;
2203 Status = ZwFreeVirtualMemory(NtCurrentProcess(),
2204 (PVOID *)&VirtualEntry,
2205 &BlockSize,
2206 MEM_RELEASE);
2207
2208 if (!NT_SUCCESS(Status))
2209 {
2210 DPRINT1("HEAP: Failed releasing memory with Status 0x%08X. Heap %p, ptr %p, base address %p\n",
2211 Status, Heap, Ptr, VirtualEntry);
2212 RtlSetLastWin32ErrorAndNtStatusFromNtStatus(Status);
2213 }
2214 }
2215 else
2216 {
2217 /* Normal allocation */
2218 BlockSize = HeapEntry->Size;
2219
2220 // TODO: Tagging
2221
2222 /* Coalesce in kernel mode, and in usermode if it's not disabled */
2223 if (RtlpGetMode() == KernelMode ||
2224 (RtlpGetMode() == UserMode && !(Heap->Flags & HEAP_DISABLE_COALESCE_ON_FREE)))
2225 {
2226 HeapEntry = (PHEAP_ENTRY)RtlpCoalesceFreeBlocks(Heap,
2227 (PHEAP_FREE_ENTRY)HeapEntry,
2228 &BlockSize,
2229 FALSE);
2230 }
2231
2232 /* If there is no need to decommit the block - put it into a free list */
2233 if (BlockSize < Heap->DeCommitFreeBlockThreshold ||
2234 (Heap->TotalFreeSize + BlockSize < Heap->DeCommitTotalFreeThreshold))
2235 {
2236 /* Check if it needs to go to a 0 list */
2237 if (BlockSize > HEAP_MAX_BLOCK_SIZE)
2238 {
2239 /* General-purpose 0 list */
2240 RtlpInsertFreeBlock(Heap, (PHEAP_FREE_ENTRY)HeapEntry, BlockSize);
2241 }
2242 else
2243 {
2244 /* Usual free list */
2245 RtlpInsertFreeBlockHelper(Heap, (PHEAP_FREE_ENTRY)HeapEntry, BlockSize, FALSE);
2246
2247 /* Assert sizes are consistent */
2248 if (!(HeapEntry->Flags & HEAP_ENTRY_LAST_ENTRY))
2249 {
2250 ASSERT((HeapEntry + BlockSize)->PreviousSize == BlockSize);
2251 }
2252
2253 /* Increase the free size */
2254 Heap->TotalFreeSize += BlockSize;
2255 }
2256
2257
2258 if (RtlpGetMode() == UserMode &&
2259 TagIndex != 0)
2260 {
2261 // FIXME: Tagging
2262 UNIMPLEMENTED;
2263 }
2264 }
2265 else
2266 {
2267 /* Decommit this block */
2268 RtlpDeCommitFreeBlock(Heap, (PHEAP_FREE_ENTRY)HeapEntry, BlockSize);
2269 }
2270 }
2271
2272 /* Release the heap lock */
2273 if (Locked) RtlLeaveHeapLock(Heap->LockVariable);
2274
2275 return TRUE;
2276 }
2277
2278 BOOLEAN NTAPI
2279 RtlpGrowBlockInPlace (IN PHEAP Heap,
2280 IN ULONG Flags,
2281 IN PHEAP_ENTRY InUseEntry,
2282 IN SIZE_T Size,
2283 IN SIZE_T Index)
2284 {
2285 UCHAR EntryFlags, RememberFlags;
2286 PHEAP_FREE_ENTRY FreeEntry, UnusedEntry, FollowingEntry;
2287 SIZE_T FreeSize, PrevSize, TailPart, AddedSize = 0;
2288 PHEAP_ENTRY_EXTRA OldExtra, NewExtra;
2289
2290 /* We can't grow beyond specified threshold */
2291 if (Index > Heap->VirtualMemoryThreshold)
2292 return FALSE;
2293
2294 /* Get entry flags */
2295 EntryFlags = InUseEntry->Flags;
2296
2297 /* Get the next free entry */
2298 FreeEntry = (PHEAP_FREE_ENTRY)(InUseEntry + InUseEntry->Size);
2299
2300 if (EntryFlags & HEAP_ENTRY_LAST_ENTRY)
2301 {
2302 /* There is no next block, just uncommitted space. Calculate how much is needed */
2303 FreeSize = (Index - InUseEntry->Size) << HEAP_ENTRY_SHIFT;
2304 FreeSize = ROUND_UP(FreeSize, PAGE_SIZE);
2305
2306 /* Find and commit those pages */
2307 FreeEntry = RtlpFindAndCommitPages(Heap,
2308 Heap->Segments[InUseEntry->SegmentOffset],
2309 &FreeSize,
2310 FreeEntry);
2311
2312 /* Fail if it failed... */
2313 if (!FreeEntry) return FALSE;
2314
2315 /* It was successful, perform coalescing */
2316 FreeSize = FreeSize >> HEAP_ENTRY_SHIFT;
2317 FreeEntry = RtlpCoalesceFreeBlocks(Heap, FreeEntry, &FreeSize, FALSE);
2318
2319 /* Check if it's enough */
2320 if (FreeSize + InUseEntry->Size < Index)
2321 {
2322 /* Still not enough */
2323 RtlpInsertFreeBlock(Heap, FreeEntry, FreeSize);
2324 Heap->TotalFreeSize += FreeSize;
2325 return FALSE;
2326 }
2327
2328 /* Remember flags of this free entry */
2329 RememberFlags = FreeEntry->Flags;
2330
2331 /* Sum up sizes */
2332 FreeSize += InUseEntry->Size;
2333 }
2334 else
2335 {
2336 /* The next block indeed exists. Check if it's free or in use */
2337 if (FreeEntry->Flags & HEAP_ENTRY_BUSY) return FALSE;
2338
2339 /* Next entry is free, check if it can fit the block we need */
2340 FreeSize = InUseEntry->Size + FreeEntry->Size;
2341 if (FreeSize < Index) return FALSE;
2342
2343 /* Remember flags of this free entry */
2344 RememberFlags = FreeEntry->Flags;
2345
2346 /* Remove this block from the free list */
2347 RtlpRemoveFreeBlock(Heap, FreeEntry, FALSE, FALSE);
2348 Heap->TotalFreeSize -= FreeEntry->Size;
2349 }
2350
2351 PrevSize = (InUseEntry->Size << HEAP_ENTRY_SHIFT) - InUseEntry->UnusedBytes;
2352 FreeSize -= Index;
2353
2354 /* Don't produce too small blocks */
2355 if (FreeSize <= 2)
2356 {
2357 Index += FreeSize;
2358 FreeSize = 0;
2359 }
2360
2361 /* Process extra stuff */
2362 if (EntryFlags & HEAP_ENTRY_EXTRA_PRESENT)
2363 {
2364 /* Calculate pointers */
2365 OldExtra = (PHEAP_ENTRY_EXTRA)(InUseEntry + InUseEntry->Size - 1);
2366 NewExtra = (PHEAP_ENTRY_EXTRA)(InUseEntry + Index - 1);
2367
2368 /* Copy contents */
2369 *NewExtra = *OldExtra;
2370
2371 // FIXME Tagging
2372 }
2373
2374 /* Update sizes */
2375 InUseEntry->Size = (USHORT)Index;
2376 InUseEntry->UnusedBytes = (UCHAR)((Index << HEAP_ENTRY_SHIFT) - Size);
2377
2378 /* Check if there is a free space remaining after merging those blocks */
2379 if (!FreeSize)
2380 {
2381 /* Update flags and sizes */
2382 InUseEntry->Flags |= RememberFlags & HEAP_ENTRY_LAST_ENTRY;
2383
2384 /* Either update previous size of the next entry or mark it as a last
2385 entry in the segment*/
2386 if (!(RememberFlags & HEAP_ENTRY_LAST_ENTRY))
2387 (InUseEntry + InUseEntry->Size)->PreviousSize = InUseEntry->Size;
2388 }
2389 else
2390 {
2391 /* Complex case, we need to split the block to give unused free space
2392 back to the heap */
2393 UnusedEntry = (PHEAP_FREE_ENTRY)(InUseEntry + Index);
2394 UnusedEntry->PreviousSize = (USHORT)Index;
2395 UnusedEntry->SegmentOffset = InUseEntry->SegmentOffset;
2396
2397 /* Update the following block or set the last entry in the segment */
2398 if (RememberFlags & HEAP_ENTRY_LAST_ENTRY)
2399 {
2400 /* Set flags and size */
2401 UnusedEntry->Flags = RememberFlags;
2402 UnusedEntry->Size = (USHORT)FreeSize;
2403
2404 /* Insert it to the heap and update total size */
2405 RtlpInsertFreeBlockHelper(Heap, UnusedEntry, FreeSize, FALSE);
2406 Heap->TotalFreeSize += FreeSize;
2407 }
2408 else
2409 {
2410 /* There is a block after this one */
2411 FollowingEntry = (PHEAP_FREE_ENTRY)((PHEAP_ENTRY)UnusedEntry + FreeSize);
2412
2413 if (FollowingEntry->Flags & HEAP_ENTRY_BUSY)
2414 {
2415 /* Update flags and set size of the unused space entry */
2416 UnusedEntry->Flags = RememberFlags & (~HEAP_ENTRY_LAST_ENTRY);
2417 UnusedEntry->Size = (USHORT)FreeSize;
2418
2419 /* Update previous size of the following entry */
2420 FollowingEntry->PreviousSize = (USHORT)FreeSize;
2421
2422 /* Insert it to the heap and update total free size */
2423 RtlpInsertFreeBlockHelper(Heap, UnusedEntry, FreeSize, FALSE);
2424 Heap->TotalFreeSize += FreeSize;
2425 }
2426 else
2427 {
2428 /* That following entry is also free, what a fortune! */
2429 RememberFlags = FollowingEntry->Flags;
2430
2431 /* Remove it */
2432 RtlpRemoveFreeBlock(Heap, FollowingEntry, FALSE, FALSE);
2433 Heap->TotalFreeSize -= FollowingEntry->Size;
2434
2435 /* And make up a new combined block */
2436 FreeSize += FollowingEntry->Size;
2437 UnusedEntry->Flags = RememberFlags;
2438
2439 /* Check where to put it */
2440 if (FreeSize <= HEAP_MAX_BLOCK_SIZE)
2441 {
2442 /* Fine for a dedicated list */
2443 UnusedEntry->Size = (USHORT)FreeSize;
2444
2445 if (!(RememberFlags & HEAP_ENTRY_LAST_ENTRY))
2446 ((PHEAP_ENTRY)UnusedEntry + FreeSize)->PreviousSize = (USHORT)FreeSize;
2447
2448 /* Insert it back and update total size */
2449 RtlpInsertFreeBlockHelper(Heap, UnusedEntry, FreeSize, FALSE);
2450 Heap->TotalFreeSize += FreeSize;
2451 }
2452 else
2453 {
2454 /* The block is very large, leave all the hassle to the insertion routine */
2455 RtlpInsertFreeBlock(Heap, UnusedEntry, FreeSize);
2456 }
2457 }
2458 }
2459 }
2460
2461 /* Properly "zero out" (and fill!) the space */
2462 if (Flags & HEAP_ZERO_MEMORY)
2463 {
2464 RtlZeroMemory((PCHAR)(InUseEntry + 1) + PrevSize, Size - PrevSize);
2465 }
2466 else if (Heap->Flags & HEAP_FREE_CHECKING_ENABLED)
2467 {
2468 /* Calculate tail part which we need to fill */
2469 TailPart = PrevSize & (sizeof(ULONG) - 1);
2470
2471 /* "Invert" it as usual */
2472 if (TailPart) TailPart = 4 - TailPart;
2473
2474 if (Size > (PrevSize + TailPart))
2475 AddedSize = (Size - (PrevSize + TailPart)) & ~(sizeof(ULONG) - 1);
2476
2477 if (AddedSize)
2478 {
2479 RtlFillMemoryUlong((PCHAR)(InUseEntry + 1) + PrevSize + TailPart,
2480 AddedSize,
2481 ARENA_INUSE_FILLER);
2482 }
2483 }
2484
2485 /* Fill the new tail */
2486 if (Heap->Flags & HEAP_TAIL_CHECKING_ENABLED)
2487 {
2488 RtlFillMemory((PCHAR)(InUseEntry + 1) + Size,
2489 HEAP_ENTRY_SIZE,
2490 HEAP_TAIL_FILL);
2491 }
2492
2493 /* Copy user settable flags */
2494 InUseEntry->Flags &= ~HEAP_ENTRY_SETTABLE_FLAGS;
2495 InUseEntry->Flags |= ((Flags & HEAP_SETTABLE_USER_FLAGS) >> 4);
2496
2497 /* Return success */
2498 return TRUE;
2499 }
2500
2501 PHEAP_ENTRY_EXTRA NTAPI
2502 RtlpGetExtraStuffPointer(PHEAP_ENTRY HeapEntry)
2503 {
2504 PHEAP_VIRTUAL_ALLOC_ENTRY VirtualEntry;
2505
2506 /* Check if it's a big block */
2507 if (HeapEntry->Flags & HEAP_ENTRY_VIRTUAL_ALLOC)
2508 {
2509 VirtualEntry = CONTAINING_RECORD(HeapEntry, HEAP_VIRTUAL_ALLOC_ENTRY, BusyBlock);
2510
2511 /* Return a pointer to the extra stuff*/
2512 return &VirtualEntry->ExtraStuff;
2513 }
2514 else
2515 {
2516 /* This is a usual entry, which means extra stuff follows this block */
2517 return (PHEAP_ENTRY_EXTRA)(HeapEntry + HeapEntry->Size - 1);
2518 }
2519 }
2520
2521
2522 /***********************************************************************
2523 * RtlReAllocateHeap
2524 * PARAMS
2525 * Heap [in] Handle of heap block
2526 * Flags [in] Heap reallocation flags
2527 * Ptr, [in] Address of memory to reallocate
2528 * Size [in] Number of bytes to reallocate
2529 *
2530 * RETURNS
2531 * Pointer to reallocated memory block
2532 * NULL: Failure
2533 * 0x7d030f60--invalid flags in RtlHeapAllocate
2534 * @implemented
2535 */
2536 PVOID NTAPI
2537 RtlReAllocateHeap(HANDLE HeapPtr,
2538 ULONG Flags,
2539 PVOID Ptr,
2540 SIZE_T Size)
2541 {
2542 PHEAP Heap = (PHEAP)HeapPtr;
2543 PHEAP_ENTRY InUseEntry, NewInUseEntry;
2544 PHEAP_ENTRY_EXTRA OldExtra, NewExtra;
2545 SIZE_T AllocationSize, FreeSize, DecommitSize;
2546 BOOLEAN HeapLocked = FALSE;
2547 PVOID NewBaseAddress;
2548 PHEAP_FREE_ENTRY SplitBlock, SplitBlock2;
2549 SIZE_T OldSize, Index, OldIndex;
2550 UCHAR FreeFlags;
2551 NTSTATUS Status;
2552 PVOID DecommitBase;
2553 SIZE_T RemainderBytes, ExtraSize;
2554 PHEAP_VIRTUAL_ALLOC_ENTRY VirtualAllocBlock;
2555 EXCEPTION_RECORD ExceptionRecord;
2556
2557 /* Return success in case of a null pointer */
2558 if (!Ptr)
2559 {
2560 RtlSetLastWin32ErrorAndNtStatusFromNtStatus(STATUS_SUCCESS);
2561 return NULL;
2562 }
2563
2564 /* Force heap flags */
2565 Flags |= Heap->ForceFlags;
2566
2567 /* Call special heap */
2568 if (RtlpHeapIsSpecial(Flags))
2569 return RtlDebugReAllocateHeap(Heap, Flags, Ptr, Size);
2570
2571 /* Make sure size is valid */
2572 if (Size >= 0x80000000)
2573 {
2574 RtlSetLastWin32ErrorAndNtStatusFromNtStatus(STATUS_NO_MEMORY);
2575 return NULL;
2576 }
2577
2578 /* Calculate allocation size and index */
2579 if (Size)
2580 AllocationSize = Size;
2581 else
2582 AllocationSize = 1;
2583 AllocationSize = (AllocationSize + Heap->AlignRound) & Heap->AlignMask;
2584
2585 /* Add up extra stuff, if it is present anywhere */
2586 if (((((PHEAP_ENTRY)Ptr)-1)->Flags & HEAP_ENTRY_EXTRA_PRESENT) ||
2587 (Flags & HEAP_EXTRA_FLAGS_MASK) ||
2588 Heap->PseudoTagEntries)
2589 {
2590 AllocationSize += sizeof(HEAP_ENTRY_EXTRA);
2591 }
2592
2593 /* Acquire the lock if necessary */
2594 if (!(Flags & HEAP_NO_SERIALIZE))
2595 {
2596 RtlEnterHeapLock(Heap->LockVariable, TRUE);
2597 HeapLocked = TRUE;
2598 Flags &= ~HEAP_NO_SERIALIZE;
2599 }
2600
2601 /* Get the pointer to the in-use entry */
2602 InUseEntry = (PHEAP_ENTRY)Ptr - 1;
2603
2604 /* If that entry is not really in-use, we have a problem */
2605 if (!(InUseEntry->Flags & HEAP_ENTRY_BUSY))
2606 {
2607 RtlSetLastWin32ErrorAndNtStatusFromNtStatus(STATUS_INVALID_PARAMETER);
2608
2609 /* Release the lock and return */
2610 if (HeapLocked)
2611 RtlLeaveHeapLock(Heap->LockVariable);
2612 return Ptr;
2613 }
2614
2615 if (InUseEntry->Flags & HEAP_ENTRY_VIRTUAL_ALLOC)
2616 {
2617 /* This is a virtually allocated block. Get its size */
2618 OldSize = RtlpGetSizeOfBigBlock(InUseEntry);
2619
2620 /* Convert it to an index */
2621 OldIndex = (OldSize + InUseEntry->Size) >> HEAP_ENTRY_SHIFT;
2622
2623 /* Calculate new allocation size and round it to the page size */
2624 AllocationSize += FIELD_OFFSET(HEAP_VIRTUAL_ALLOC_ENTRY, BusyBlock);
2625 AllocationSize = ROUND_UP(AllocationSize, PAGE_SIZE);
2626 }
2627 else
2628 {
2629 /* Usual entry */
2630 OldIndex = InUseEntry->Size;
2631
2632 OldSize = (OldIndex << HEAP_ENTRY_SHIFT) - InUseEntry->UnusedBytes;
2633 }
2634
2635 /* Calculate new index */
2636 Index = AllocationSize >> HEAP_ENTRY_SHIFT;
2637
2638 /* Check for 4 different scenarios (old size, new size, old index, new index) */
2639 if (Index <= OldIndex)
2640 {
2641 /* Difference must be greater than 1, adjust if it's not so */
2642 if (Index + 1 == OldIndex)
2643 {
2644 Index++;
2645 AllocationSize += sizeof(HEAP_ENTRY);
2646 }
2647
2648 /* Calculate new size */
2649 if (InUseEntry->Flags & HEAP_ENTRY_VIRTUAL_ALLOC)
2650 {
2651 /* Simple in case of a virtual alloc - just an unused size */
2652 InUseEntry->Size = (USHORT)(AllocationSize - Size);
2653 ASSERT(InUseEntry->Size >= sizeof(HEAP_VIRTUAL_ALLOC_ENTRY));
2654 }
2655 else if (InUseEntry->Flags & HEAP_ENTRY_EXTRA_PRESENT)
2656 {
2657 /* There is extra stuff, take it into account */
2658 OldExtra = (PHEAP_ENTRY_EXTRA)(InUseEntry + InUseEntry->Size - 1);
2659 NewExtra = (PHEAP_ENTRY_EXTRA)(InUseEntry + Index - 1);
2660 *NewExtra = *OldExtra;
2661
2662 // FIXME Tagging, TagIndex
2663
2664 /* Update unused bytes count */
2665 InUseEntry->UnusedBytes = (UCHAR)(AllocationSize - Size);
2666 }
2667 else
2668 {
2669 // FIXME Tagging, SmallTagIndex
2670 InUseEntry->UnusedBytes = (UCHAR)(AllocationSize - Size);
2671 }
2672
2673 /* If new size is bigger than the old size */
2674 if (Size > OldSize)
2675 {
2676 /* Zero out that additional space if required */
2677 if (Flags & HEAP_ZERO_MEMORY)
2678 {
2679 RtlZeroMemory((PCHAR)Ptr + OldSize, Size - OldSize);
2680 }
2681 else if (Heap->Flags & HEAP_FREE_CHECKING_ENABLED)
2682 {
2683 /* Fill it on free if required */
2684 RemainderBytes = OldSize & (sizeof(ULONG) - 1);
2685
2686 if (RemainderBytes)
2687 RemainderBytes = 4 - RemainderBytes;
2688
2689 if (Size > (OldSize + RemainderBytes))
2690 {
2691 /* Calculate actual amount of extra bytes to fill */
2692 ExtraSize = (Size - (OldSize + RemainderBytes)) & ~(sizeof(ULONG) - 1);
2693
2694 /* Fill them if there are any */
2695 if (ExtraSize != 0)
2696 {
2697 RtlFillMemoryUlong((PCHAR)(InUseEntry + 1) + OldSize + RemainderBytes,
2698 ExtraSize,
2699 ARENA_INUSE_FILLER);
2700 }
2701 }
2702 }
2703 }
2704
2705 /* Fill tail of the heap entry if required */
2706 if (Heap->Flags & HEAP_TAIL_CHECKING_ENABLED)
2707 {
2708 RtlFillMemory((PCHAR)(InUseEntry + 1) + Size,
2709 HEAP_ENTRY_SIZE,
2710 HEAP_TAIL_FILL);
2711 }
2712
2713 /* Check if the difference is significant or not */
2714 if (Index != OldIndex)
2715 {
2716 /* Save flags */
2717 FreeFlags = InUseEntry->Flags & ~HEAP_ENTRY_BUSY;
2718
2719 if (FreeFlags & HEAP_ENTRY_VIRTUAL_ALLOC)
2720 {
2721 /* This is a virtual block allocation */
2722 VirtualAllocBlock = CONTAINING_RECORD(InUseEntry, HEAP_VIRTUAL_ALLOC_ENTRY, BusyBlock);
2723
2724 // FIXME Tagging!
2725
2726 DecommitBase = (PCHAR)VirtualAllocBlock + AllocationSize;
2727 DecommitSize = (OldIndex << HEAP_ENTRY_SHIFT) - AllocationSize;
2728
2729 /* Release the memory */
2730 Status = ZwFreeVirtualMemory(NtCurrentProcess(),
2731 (PVOID *)&DecommitBase,
2732 &DecommitSize,
2733 MEM_RELEASE);
2734
2735 if (!NT_SUCCESS(Status))
2736 {
2737 DPRINT1("HEAP: Unable to release memory (pointer %p, size 0x%x), Status %08x\n", DecommitBase, DecommitSize, Status);
2738 }
2739 else
2740 {
2741 /* Otherwise reduce the commit size */
2742 VirtualAllocBlock->CommitSize -= DecommitSize;
2743 }
2744 }
2745 else
2746 {
2747 /* Reduce size of the block and possibly split it */
2748 SplitBlock = (PHEAP_FREE_ENTRY)(InUseEntry + Index);
2749
2750 /* Initialize this entry */
2751 SplitBlock->Flags = FreeFlags;
2752 SplitBlock->PreviousSize = (USHORT)Index;
2753 SplitBlock->SegmentOffset = InUseEntry->SegmentOffset;
2754
2755 /* Remember free size */
2756 FreeSize = InUseEntry->Size - Index;
2757
2758 /* Set new size */
2759 InUseEntry->Size = (USHORT)Index;
2760 InUseEntry->Flags &= ~HEAP_ENTRY_LAST_ENTRY;
2761
2762 /* Is that the last entry */
2763 if (FreeFlags & HEAP_ENTRY_LAST_ENTRY)
2764 {
2765 /* Set its size and insert it to the list */
2766 SplitBlock->Size = (USHORT)FreeSize;
2767 RtlpInsertFreeBlockHelper(Heap, SplitBlock, FreeSize, FALSE);
2768
2769 /* Update total free size */
2770 Heap->TotalFreeSize += FreeSize;
2771 }
2772 else
2773 {
2774 /* Get the block after that one */
2775 SplitBlock2 = (PHEAP_FREE_ENTRY)((PHEAP_ENTRY)SplitBlock + FreeSize);
2776
2777 if (SplitBlock2->Flags & HEAP_ENTRY_BUSY)
2778 {
2779 /* It's in use, add it here*/
2780 SplitBlock->Size = (USHORT)FreeSize;
2781
2782 /* Update previous size of the next entry */
2783 ((PHEAP_FREE_ENTRY)((PHEAP_ENTRY)SplitBlock + FreeSize))->PreviousSize = (USHORT)FreeSize;
2784
2785 /* Insert it to the list */
2786 RtlpInsertFreeBlockHelper(Heap, SplitBlock, FreeSize, FALSE);
2787
2788 /* Update total size */
2789 Heap->TotalFreeSize += FreeSize;
2790 }
2791 else
2792 {
2793 /* Next entry is free, so merge with it */
2794 SplitBlock->Flags = SplitBlock2->Flags;
2795
2796 /* Remove it, update total size */
2797 RtlpRemoveFreeBlock(Heap, SplitBlock2, FALSE, FALSE);
2798 Heap->TotalFreeSize -= SplitBlock2->Size;
2799
2800 /* Calculate total free size */
2801 FreeSize += SplitBlock2->Size;
2802
2803 if (FreeSize <= HEAP_MAX_BLOCK_SIZE)
2804 {
2805 SplitBlock->Size = (USHORT)FreeSize;
2806
2807 if (!(SplitBlock->Flags & HEAP_ENTRY_LAST_ENTRY))
2808 {
2809 /* Update previous size of the next entry */
2810 ((PHEAP_FREE_ENTRY)((PHEAP_ENTRY)SplitBlock + FreeSize))->PreviousSize = (USHORT)FreeSize;
2811 }
2812
2813 /* Insert the new one back and update total size */
2814 RtlpInsertFreeBlockHelper(Heap, SplitBlock, FreeSize, FALSE);
2815 Heap->TotalFreeSize += FreeSize;
2816 }
2817 else
2818 {
2819 /* Just add it */
2820 RtlpInsertFreeBlock(Heap, SplitBlock, FreeSize);
2821 }
2822 }
2823 }
2824 }
2825 }
2826 }
2827 else
2828 {
2829 /* We're growing the block */
2830 if ((InUseEntry->Flags & HEAP_ENTRY_VIRTUAL_ALLOC) ||
2831 !RtlpGrowBlockInPlace(Heap, Flags, InUseEntry, Size, Index))
2832 {
2833 /* Growing in place failed, so growing out of place */
2834 if (Flags & HEAP_REALLOC_IN_PLACE_ONLY)
2835 {
2836 DPRINT1("Realloc in place failed, but it was the only option\n");
2837 Ptr = NULL;
2838 }
2839 else
2840 {
2841 /* Clear tag bits */
2842 Flags &= ~HEAP_TAG_MASK;
2843
2844 /* Process extra stuff */
2845 if (InUseEntry->Flags & HEAP_ENTRY_EXTRA_PRESENT)
2846 {
2847 /* Preserve user settable flags */
2848 Flags &= ~HEAP_SETTABLE_USER_FLAGS;
2849
2850 Flags |= HEAP_SETTABLE_USER_VALUE | ((InUseEntry->Flags & HEAP_ENTRY_SETTABLE_FLAGS) << 4);
2851
2852 /* Get pointer to the old extra data */
2853 OldExtra = RtlpGetExtraStuffPointer(InUseEntry);
2854
2855 /* Save tag index if it was set */
2856 if (OldExtra->TagIndex &&
2857 !(OldExtra->TagIndex & HEAP_PSEUDO_TAG_FLAG))
2858 {
2859 Flags |= OldExtra->TagIndex << HEAP_TAG_SHIFT;
2860 }
2861 }
2862 else if (InUseEntry->SmallTagIndex)
2863 {
2864 /* Take small tag index into account */
2865 Flags |= InUseEntry->SmallTagIndex << HEAP_TAG_SHIFT;
2866 }
2867
2868 /* Allocate new block from the heap */
2869 NewBaseAddress = RtlAllocateHeap(HeapPtr,
2870 Flags & ~HEAP_ZERO_MEMORY,
2871 Size);
2872
2873 /* Proceed if it didn't fail */
2874 if (NewBaseAddress)
2875 {
2876 /* Get new entry pointer */
2877 NewInUseEntry = (PHEAP_ENTRY)NewBaseAddress - 1;
2878
2879 /* Process extra stuff if it exists */
2880 if (NewInUseEntry->Flags & HEAP_ENTRY_EXTRA_PRESENT)
2881 {
2882 NewExtra = RtlpGetExtraStuffPointer(NewInUseEntry);
2883
2884 if (InUseEntry->Flags & HEAP_ENTRY_EXTRA_PRESENT)
2885 {
2886 OldExtra = RtlpGetExtraStuffPointer(InUseEntry);
2887 NewExtra->Settable = OldExtra->Settable;
2888 }
2889 else
2890 {
2891 RtlZeroMemory(NewExtra, sizeof(*NewExtra));
2892 }
2893 }
2894
2895 /* Copy actual user bits */
2896 if (Size < OldSize)
2897 RtlMoveMemory(NewBaseAddress, Ptr, Size);
2898 else
2899 RtlMoveMemory(NewBaseAddress, Ptr, OldSize);
2900
2901 /* Zero remaining part if required */
2902 if (Size > OldSize &&
2903 (Flags & HEAP_ZERO_MEMORY))
2904 {
2905 RtlZeroMemory((PCHAR)NewBaseAddress + OldSize, Size - OldSize);
2906 }
2907
2908 /* Free the old block */
2909 RtlFreeHeap(HeapPtr, Flags, Ptr);
2910 }
2911
2912 Ptr = NewBaseAddress;
2913 }
2914 }
2915 }
2916
2917 /* Did resizing fail? */
2918 if (!Ptr && (Flags & HEAP_GENERATE_EXCEPTIONS))
2919 {
2920 /* Generate an exception if required */
2921 ExceptionRecord.ExceptionCode = STATUS_NO_MEMORY;
2922 ExceptionRecord.ExceptionRecord = NULL;
2923 ExceptionRecord.NumberParameters = 1;
2924 ExceptionRecord.ExceptionFlags = 0;
2925 ExceptionRecord.ExceptionInformation[0] = AllocationSize;
2926
2927 RtlRaiseException(&ExceptionRecord);
2928 }
2929
2930 /* Release the heap lock if it was acquired */
2931 if (HeapLocked)
2932 RtlLeaveHeapLock(Heap->LockVariable);
2933
2934 return Ptr;
2935 }
2936
2937
2938 /***********************************************************************
2939 * RtlCompactHeap
2940 *
2941 * @unimplemented
2942 */
2943 ULONG NTAPI
2944 RtlCompactHeap(HANDLE Heap,
2945 ULONG Flags)
2946 {
2947 UNIMPLEMENTED;
2948 return 0;
2949 }
2950
2951
2952 /***********************************************************************
2953 * RtlLockHeap
2954 * Attempts to acquire the critical section object for a specified heap.
2955 *
2956 * PARAMS
2957 * Heap [in] Handle of heap to lock for exclusive access
2958 *
2959 * RETURNS
2960 * TRUE: Success
2961 * FALSE: Failure
2962 *
2963 * @implemented
2964 */
2965 BOOLEAN NTAPI
2966 RtlLockHeap(IN HANDLE HeapPtr)
2967 {
2968 PHEAP Heap = (PHEAP)HeapPtr;
2969
2970 // FIXME Check for special heap
2971
2972 /* Check if it's really a heap */
2973 if (Heap->Signature != HEAP_SIGNATURE) return FALSE;
2974
2975 /* Lock if it's lockable */
2976 if (!(Heap->Flags & HEAP_NO_SERIALIZE))
2977 {
2978 RtlEnterHeapLock(Heap->LockVariable, TRUE);
2979 }
2980
2981 return TRUE;
2982 }
2983
2984
2985 /***********************************************************************
2986 * RtlUnlockHeap
2987 * Releases ownership of the critical section object.
2988 *
2989 * PARAMS
2990 * Heap [in] Handle to the heap to unlock
2991 *
2992 * RETURNS
2993 * TRUE: Success
2994 * FALSE: Failure
2995 *
2996 * @implemented
2997 */
2998 BOOLEAN NTAPI
2999 RtlUnlockHeap(HANDLE HeapPtr)
3000 {
3001 PHEAP Heap = (PHEAP)HeapPtr;
3002
3003 // FIXME Check for special heap
3004
3005 /* Check if it's really a heap */
3006 if (Heap->Signature != HEAP_SIGNATURE) return FALSE;
3007
3008 /* Unlock if it's lockable */
3009 if (!(Heap->Flags & HEAP_NO_SERIALIZE))
3010 {
3011 RtlLeaveHeapLock(Heap->LockVariable);
3012 }
3013
3014 return TRUE;
3015 }
3016
3017
3018 /***********************************************************************
3019 * RtlSizeHeap
3020 * PARAMS
3021 * Heap [in] Handle of heap
3022 * Flags [in] Heap size control flags
3023 * Ptr [in] Address of memory to return size for
3024 *
3025 * RETURNS
3026 * Size in bytes of allocated memory
3027 * 0xffffffff: Failure
3028 *
3029 * @implemented
3030 */
3031 SIZE_T NTAPI
3032 RtlSizeHeap(
3033 HANDLE HeapPtr,
3034 ULONG Flags,
3035 PVOID Ptr
3036 )
3037 {
3038 PHEAP Heap = (PHEAP)HeapPtr;
3039 PHEAP_ENTRY HeapEntry;
3040 SIZE_T EntrySize;
3041
3042 // FIXME This is a hack around missing SEH support!
3043 if (!Heap)
3044 {
3045 RtlSetLastWin32ErrorAndNtStatusFromNtStatus(STATUS_INVALID_HANDLE);
3046 return (SIZE_T)-1;
3047 }
3048
3049 /* Force flags */
3050 Flags |= Heap->ForceFlags;
3051
3052 /* Call special heap */
3053 if (RtlpHeapIsSpecial(Flags))
3054 return RtlDebugSizeHeap(Heap, Flags, Ptr);
3055
3056 /* Get the heap entry pointer */
3057 HeapEntry = (PHEAP_ENTRY)Ptr - 1;
3058
3059 /* Return -1 if that entry is free */
3060 if (!(HeapEntry->Flags & HEAP_ENTRY_BUSY))
3061 {
3062 RtlSetLastWin32ErrorAndNtStatusFromNtStatus(STATUS_INVALID_PARAMETER);
3063 return (SIZE_T)-1;
3064 }
3065
3066 /* Get size of this block depending if it's a usual or a big one */
3067 if (HeapEntry->Flags & HEAP_ENTRY_VIRTUAL_ALLOC)
3068 {
3069 EntrySize = RtlpGetSizeOfBigBlock(HeapEntry);
3070 }
3071 else
3072 {
3073 /* Calculate it */
3074 EntrySize = (HeapEntry->Size << HEAP_ENTRY_SHIFT) - HeapEntry->UnusedBytes;
3075 }
3076
3077 /* Return calculated size */
3078 return EntrySize;
3079 }
3080
3081 BOOLEAN NTAPI
3082 RtlpCheckInUsePattern(PHEAP_ENTRY HeapEntry)
3083 {
3084 SIZE_T Size, Result;
3085 PCHAR TailPart;
3086
3087 /* Calculate size */
3088 if (HeapEntry->Flags & HEAP_ENTRY_VIRTUAL_ALLOC)
3089 Size = RtlpGetSizeOfBigBlock(HeapEntry);
3090 else
3091 Size = (HeapEntry->Size << HEAP_ENTRY_SHIFT) - HeapEntry->UnusedBytes;
3092
3093 /* Calculate pointer to the tail part of the block */
3094 TailPart = (PCHAR)(HeapEntry + 1) + Size;
3095
3096 /* Compare tail pattern */
3097 Result = RtlCompareMemory(TailPart,
3098 FillPattern,
3099 HEAP_ENTRY_SIZE);
3100
3101 if (Result != HEAP_ENTRY_SIZE)
3102 {
3103 DPRINT1("HEAP: Heap entry (size %x) %p tail is modified at %p\n", Size, HeapEntry, TailPart + Result);
3104 return FALSE;
3105 }
3106
3107 /* All is fine */
3108 return TRUE;
3109 }
3110
3111 BOOLEAN NTAPI
3112 RtlpValidateHeapHeaders(
3113 PHEAP Heap,
3114 BOOLEAN Recalculate)
3115 {
3116 // We skip header validation for now
3117 return TRUE;
3118 }
3119
3120 BOOLEAN NTAPI
3121 RtlpValidateHeapEntry(
3122 PHEAP Heap,
3123 PHEAP_ENTRY HeapEntry)
3124 {
3125 BOOLEAN BigAllocation, EntryFound = FALSE;
3126 PHEAP_SEGMENT Segment;
3127 ULONG SegmentOffset;
3128
3129 /* Perform various consistency checks of this entry */
3130 if (!HeapEntry) goto invalid_entry;
3131 if ((ULONG_PTR)HeapEntry & (HEAP_ENTRY_SIZE - 1)) goto invalid_entry;
3132 if (!(HeapEntry->Flags & HEAP_ENTRY_BUSY)) goto invalid_entry;
3133
3134 BigAllocation = HeapEntry->Flags & HEAP_ENTRY_VIRTUAL_ALLOC;
3135 Segment = Heap->Segments[HeapEntry->SegmentOffset];
3136
3137 if (BigAllocation &&
3138 (((ULONG_PTR)HeapEntry & (PAGE_SIZE - 1)) != FIELD_OFFSET(HEAP_VIRTUAL_ALLOC_ENTRY, BusyBlock)))
3139 goto invalid_entry;
3140
3141 if (!BigAllocation && (HeapEntry->SegmentOffset >= HEAP_SEGMENTS ||
3142 !Segment ||
3143 HeapEntry < Segment->FirstEntry ||
3144 HeapEntry >= Segment->LastValidEntry))
3145 goto invalid_entry;
3146
3147 if ((HeapEntry->Flags & HEAP_ENTRY_FILL_PATTERN) &&
3148 !RtlpCheckInUsePattern(HeapEntry))
3149 goto invalid_entry;
3150
3151 /* Checks are done, if this is a virtual entry, that's all */
3152 if (HeapEntry->Flags & HEAP_ENTRY_VIRTUAL_ALLOC) return TRUE;
3153
3154 /* Go through segments and check if this entry fits into any of them */
3155 for (SegmentOffset = 0; SegmentOffset < HEAP_SEGMENTS; SegmentOffset++)
3156 {
3157 Segment = Heap->Segments[SegmentOffset];
3158 if (!Segment) continue;
3159
3160 if ((HeapEntry >= Segment->FirstEntry) &&
3161 (HeapEntry < Segment->LastValidEntry))
3162 {
3163 /* Got it */
3164 EntryFound = TRUE;
3165 break;
3166 }
3167 }
3168
3169 /* Return our result of finding entry in the segments */
3170 return EntryFound;
3171
3172 invalid_entry:
3173 DPRINT1("HEAP: Invalid heap entry %p in heap %p\n", HeapEntry, Heap);
3174 return FALSE;
3175 }
3176
3177 BOOLEAN NTAPI
3178 RtlpValidateHeapSegment(
3179 PHEAP Heap,
3180 PHEAP_SEGMENT Segment,
3181 UCHAR SegmentOffset,
3182 PULONG FreeEntriesCount,
3183 PSIZE_T TotalFreeSize,
3184 PSIZE_T TagEntries,
3185 PSIZE_T PseudoTagEntries)
3186 {
3187 PHEAP_UCR_DESCRIPTOR UcrDescriptor;
3188 PLIST_ENTRY UcrEntry;
3189 SIZE_T ByteSize, Size, Result;
3190 PHEAP_ENTRY CurrentEntry;
3191 ULONG UnCommittedPages;
3192 ULONG UnCommittedRanges;
3193 ULONG PreviousSize;
3194
3195 UnCommittedPages = 0;
3196 UnCommittedRanges = 0;
3197
3198 if (IsListEmpty(&Segment->UCRSegmentList))
3199 {
3200 UcrEntry = NULL;
3201 UcrDescriptor = NULL;
3202 }
3203 else
3204 {
3205 UcrEntry = Segment->UCRSegmentList.Flink;
3206 UcrDescriptor = CONTAINING_RECORD(UcrEntry, HEAP_UCR_DESCRIPTOR, SegmentEntry);
3207 }
3208
3209 if (Segment->BaseAddress == Heap)
3210 CurrentEntry = &Heap->Entry;
3211 else
3212 CurrentEntry = &Segment->Entry;
3213
3214 while (CurrentEntry < Segment->LastValidEntry)
3215 {
3216 if (UcrDescriptor &&
3217 ((PVOID)CurrentEntry >= UcrDescriptor->Address))
3218 {
3219 DPRINT1("HEAP: Entry %p is not inside uncommited range [%p .. %p)\n",
3220 CurrentEntry, UcrDescriptor->Address,
3221 (PCHAR)UcrDescriptor->Address + UcrDescriptor->Size);
3222
3223 return FALSE;
3224 }
3225
3226 PreviousSize = 0;
3227
3228 while (CurrentEntry < Segment->LastValidEntry)
3229 {
3230 if (PreviousSize != CurrentEntry->PreviousSize)
3231 {
3232 DPRINT1("HEAP: Entry %p has incorrect PreviousSize %x instead of %x\n",
3233 CurrentEntry, CurrentEntry->PreviousSize, PreviousSize);
3234
3235 return FALSE;
3236 }
3237
3238 PreviousSize = CurrentEntry->Size;
3239 Size = CurrentEntry->Size << HEAP_ENTRY_SHIFT;
3240
3241 if (CurrentEntry->Flags & HEAP_ENTRY_BUSY)
3242 {
3243 if (TagEntries)
3244 {
3245 UNIMPLEMENTED;
3246 }
3247
3248 /* Check fill pattern */
3249 if (CurrentEntry->Flags & HEAP_ENTRY_FILL_PATTERN)
3250 {
3251 if (!RtlpCheckInUsePattern(CurrentEntry))
3252 return FALSE;
3253 }
3254 }
3255 else
3256 {
3257 /* The entry is free, increase free entries count and total free size */
3258 *FreeEntriesCount = *FreeEntriesCount + 1;
3259 *TotalFreeSize += CurrentEntry->Size;
3260
3261 if ((Heap->Flags & HEAP_FREE_CHECKING_ENABLED) &&
3262 (CurrentEntry->Flags & HEAP_ENTRY_FILL_PATTERN))
3263 {
3264 ByteSize = Size - sizeof(HEAP_FREE_ENTRY);
3265
3266 if ((CurrentEntry->Flags & HEAP_ENTRY_EXTRA_PRESENT) &&
3267 (ByteSize > sizeof(HEAP_FREE_ENTRY_EXTRA)))
3268 {
3269 ByteSize -= sizeof(HEAP_FREE_ENTRY_EXTRA);
3270 }
3271
3272 Result = RtlCompareMemoryUlong((PCHAR)((PHEAP_FREE_ENTRY)CurrentEntry + 1),
3273 ByteSize,
3274 ARENA_FREE_FILLER);
3275
3276 if (Result != ByteSize)
3277 {
3278 DPRINT1("HEAP: Free heap block %p modified at %p after it was freed\n",
3279 CurrentEntry,
3280 (PCHAR)(CurrentEntry + 1) + Result);
3281
3282 return FALSE;
3283 }
3284 }
3285 }
3286
3287 if (CurrentEntry->SegmentOffset != SegmentOffset)
3288 {
3289 DPRINT1("HEAP: Heap entry %p SegmentOffset is incorrect %x (should be %x)\n",
3290 CurrentEntry, SegmentOffset, CurrentEntry->SegmentOffset);
3291 return FALSE;
3292 }
3293
3294 /* Check if it's the last entry */
3295 if (CurrentEntry->Flags & HEAP_ENTRY_LAST_ENTRY)
3296 {
3297 CurrentEntry = (PHEAP_ENTRY)((PCHAR)CurrentEntry + Size);
3298
3299 if (!UcrDescriptor)
3300 {
3301 /* Check if it's not really the last one */
3302 if (CurrentEntry != Segment->LastValidEntry)
3303 {
3304 DPRINT1("HEAP: Heap entry %p is not last block in segment (%p)\n",
3305 CurrentEntry, Segment->LastValidEntry);
3306 return FALSE;
3307 }
3308 }
3309 else if (CurrentEntry != UcrDescriptor->Address)
3310 {
3311 DPRINT1("HEAP: Heap entry %p does not match next uncommitted address (%p)\n",
3312 CurrentEntry, UcrDescriptor->Address);
3313
3314 return FALSE;
3315 }
3316 else
3317 {
3318 UnCommittedPages += (ULONG)(UcrDescriptor->Size / PAGE_SIZE);
3319 UnCommittedRanges++;
3320
3321 CurrentEntry = (PHEAP_ENTRY)((PCHAR)UcrDescriptor->Address + UcrDescriptor->Size);
3322
3323 /* Go to the next UCR descriptor */
3324 UcrEntry = UcrEntry->Flink;
3325 if (UcrEntry == &Segment->UCRSegmentList)
3326 {
3327 UcrEntry = NULL;
3328 UcrDescriptor = NULL;
3329 }
3330 else
3331 {
3332 UcrDescriptor = CONTAINING_RECORD(UcrEntry, HEAP_UCR_DESCRIPTOR, SegmentEntry);
3333 }
3334 }
3335
3336 break;
3337 }
3338
3339 /* Advance to the next entry */
3340 CurrentEntry = (PHEAP_ENTRY)((PCHAR)CurrentEntry + Size);
3341 }
3342 }
3343
3344 /* Check total numbers of UCP and UCR */
3345 if (Segment->NumberOfUnCommittedPages != UnCommittedPages)
3346 {
3347 DPRINT1("HEAP: Segment %p NumberOfUnCommittedPages is invalid (%x != %x)\n",
3348 Segment, Segment->NumberOfUnCommittedPages, UnCommittedPages);
3349
3350 return FALSE;
3351 }
3352
3353 if (Segment->NumberOfUnCommittedRanges != UnCommittedRanges)
3354 {
3355 DPRINT1("HEAP: Segment %p NumberOfUnCommittedRanges is invalid (%x != %x)\n",
3356 Segment, Segment->NumberOfUnCommittedRanges, UnCommittedRanges);
3357
3358 return FALSE;
3359 }
3360
3361 return TRUE;
3362 }
3363
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