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Fixed error recovery during thread creation.
[wine.git] / memory / heap.c
blob0437a0c9e5966aebbbd8ccc7f66711d7263c166e
1 /*
2 * Win32 heap functions
3 *
4 * Copyright 1996 Alexandre Julliard
5 * Copyright 1998 Ulrich Weigand
6 */
7
8 #include <assert.h>
9 #include <stdlib.h>
10 #include <stdio.h>
11 #include <string.h>
12 #include "wine/winbase16.h"
13 #include "wine/unicode.h"
14 #include "selectors.h"
15 #include "global.h"
16 #include "winbase.h"
17 #include "winerror.h"
18 #include "winnt.h"
19 #include "heap.h"
20 #include "toolhelp.h"
21 #include "debugtools.h"
22 #include "winnls.h"
23
24 DEFAULT_DEBUG_CHANNEL(heap);
25
26 /* Note: the heap data structures are based on what Pietrek describes in his
27 * book 'Windows 95 System Programming Secrets'. The layout is not exactly
28 * the same, but could be easily adapted if it turns out some programs
29 * require it.
30 */
31
32 typedef struct tagARENA_INUSE
33 {
34 DWORD size; /* Block size; must be the first field */
35 WORD magic; /* Magic number */
36 WORD threadId; /* Allocating thread id */
37 void *callerEIP; /* EIP of caller upon allocation */
38 } ARENA_INUSE;
39
40 typedef struct tagARENA_FREE
41 {
42 DWORD size; /* Block size; must be the first field */
43 WORD magic; /* Magic number */
44 WORD threadId; /* Freeing thread id */
45 struct tagARENA_FREE *next; /* Next free arena */
46 struct tagARENA_FREE *prev; /* Prev free arena */
47 } ARENA_FREE;
48
49 #define ARENA_FLAG_FREE 0x00000001 /* flags OR'ed with arena size */
50 #define ARENA_FLAG_PREV_FREE 0x00000002
51 #define ARENA_SIZE_MASK 0xfffffffc
52 #define ARENA_INUSE_MAGIC 0x4842 /* Value for arena 'magic' field */
53 #define ARENA_FREE_MAGIC 0x4846 /* Value for arena 'magic' field */
54
55 #define ARENA_INUSE_FILLER 0x55
56 #define ARENA_FREE_FILLER 0xaa
57
58 #define QUIET 1 /* Suppress messages */
59 #define NOISY 0 /* Report all errors */
60
61 #define HEAP_NB_FREE_LISTS 4 /* Number of free lists */
62
63 /* Max size of the blocks on the free lists */
64 static const DWORD HEAP_freeListSizes[HEAP_NB_FREE_LISTS] =
65 {
66 0x20, 0x80, 0x200, 0xffffffff
67 };
68
69 typedef struct
70 {
71 DWORD size;
72 ARENA_FREE arena;
73 } FREE_LIST_ENTRY;
74
75 struct tagHEAP;
76
77 typedef struct tagSUBHEAP
78 {
79 DWORD size; /* Size of the whole sub-heap */
80 DWORD commitSize; /* Committed size of the sub-heap */
81 DWORD headerSize; /* Size of the heap header */
82 struct tagSUBHEAP *next; /* Next sub-heap */
83 struct tagHEAP *heap; /* Main heap structure */
84 DWORD magic; /* Magic number */
85 WORD selector; /* Selector for HEAP_WINE_SEGPTR heaps */
86 } SUBHEAP;
87
88 #define SUBHEAP_MAGIC ((DWORD)('S' | ('U'<<8) | ('B'<<16) | ('H'<<24)))
89
90 typedef struct tagHEAP
91 {
92 SUBHEAP subheap; /* First sub-heap */
93 struct tagHEAP *next; /* Next heap for this process */
94 FREE_LIST_ENTRY freeList[HEAP_NB_FREE_LISTS]; /* Free lists */
95 CRITICAL_SECTION critSection; /* Critical section for serialization */
96 DWORD flags; /* Heap flags */
97 DWORD magic; /* Magic number */
98 void *private; /* Private pointer for the user of the heap */
99 } HEAP;
100
101 #define HEAP_MAGIC ((DWORD)('H' | ('E'<<8) | ('A'<<16) | ('P'<<24)))
102
103 #define HEAP_DEF_SIZE 0x110000 /* Default heap size = 1Mb + 64Kb */
104 #define HEAP_MIN_BLOCK_SIZE (8+sizeof(ARENA_FREE)) /* Min. heap block size */
105 #define COMMIT_MASK 0xffff /* bitmask for commit/decommit granularity */
106
107 HANDLE SystemHeap = 0;
108
109 SYSTEM_HEAP_DESCR *SystemHeapDescr = 0;
110
111 static HEAP *processHeap; /* main process heap */
112 static HEAP *segptrHeap; /* main segptr heap */
113 static HEAP *firstHeap; /* head of secondary heaps list */
114
115 /* address where we try to map the system heap */
116 #define SYSTEM_HEAP_BASE ((void*)0x65430000)
117
118 static BOOL HEAP_IsRealArena( HEAP *heapPtr, DWORD flags, LPCVOID block, BOOL quiet );
119
120 #ifdef __GNUC__
121 #define GET_EIP() (__builtin_return_address(0))
122 #define SET_EIP(ptr) ((ARENA_INUSE*)(ptr) - 1)->callerEIP = GET_EIP()
123 #else
124 #define GET_EIP() 0
125 #define SET_EIP(ptr) /* nothing */
126 #endif /* __GNUC__ */
127
128 /***********************************************************************
129 * HEAP_Dump
130 */
131 void HEAP_Dump( HEAP *heap )
132 {
133 int i;
134 SUBHEAP *subheap;
135 char *ptr;
136
137 DPRINTF( "Heap: %08lx\n", (DWORD)heap );
138 DPRINTF( "Next: %08lx Sub-heaps: %08lx",
139 (DWORD)heap->next, (DWORD)&heap->subheap );
140 subheap = &heap->subheap;
141 while (subheap->next)
142 {
143 DPRINTF( " -> %08lx", (DWORD)subheap->next );
144 subheap = subheap->next;
145 }
146
147 DPRINTF( "\nFree lists:\n Block Stat Size Id\n" );
148 for (i = 0; i < HEAP_NB_FREE_LISTS; i++)
149 DPRINTF( "%08lx free %08lx %04x prev=%08lx next=%08lx\n",
150 (DWORD)&heap->freeList[i].arena, heap->freeList[i].arena.size,
151 heap->freeList[i].arena.threadId,
152 (DWORD)heap->freeList[i].arena.prev,
153 (DWORD)heap->freeList[i].arena.next );
154
155 subheap = &heap->subheap;
156 while (subheap)
157 {
158 DWORD freeSize = 0, usedSize = 0, arenaSize = subheap->headerSize;
159 DPRINTF( "\n\nSub-heap %08lx: size=%08lx committed=%08lx\n",
160 (DWORD)subheap, subheap->size, subheap->commitSize );
161
162 DPRINTF( "\n Block Stat Size Id\n" );
163 ptr = (char*)subheap + subheap->headerSize;
164 while (ptr < (char *)subheap + subheap->size)
165 {
166 if (*(DWORD *)ptr & ARENA_FLAG_FREE)
167 {
168 ARENA_FREE *pArena = (ARENA_FREE *)ptr;
169 DPRINTF( "%08lx free %08lx %04x prev=%08lx next=%08lx\n",
170 (DWORD)pArena, pArena->size & ARENA_SIZE_MASK,
171 pArena->threadId, (DWORD)pArena->prev,
172 (DWORD)pArena->next);
173 ptr += sizeof(*pArena) + (pArena->size & ARENA_SIZE_MASK);
174 arenaSize += sizeof(ARENA_FREE);
175 freeSize += pArena->size & ARENA_SIZE_MASK;
176 }
177 else if (*(DWORD *)ptr & ARENA_FLAG_PREV_FREE)
178 {
179 ARENA_INUSE *pArena = (ARENA_INUSE *)ptr;
180 DPRINTF( "%08lx Used %08lx %04x back=%08lx EIP=%p\n",
181 (DWORD)pArena, pArena->size & ARENA_SIZE_MASK,
182 pArena->threadId, *((DWORD *)pArena - 1),
183 pArena->callerEIP );
184 ptr += sizeof(*pArena) + (pArena->size & ARENA_SIZE_MASK);
185 arenaSize += sizeof(ARENA_INUSE);
186 usedSize += pArena->size & ARENA_SIZE_MASK;
187 }
188 else
189 {
190 ARENA_INUSE *pArena = (ARENA_INUSE *)ptr;
191 DPRINTF( "%08lx used %08lx %04x EIP=%p\n",
192 (DWORD)pArena, pArena->size & ARENA_SIZE_MASK,
193 pArena->threadId, pArena->callerEIP );
194 ptr += sizeof(*pArena) + (pArena->size & ARENA_SIZE_MASK);
195 arenaSize += sizeof(ARENA_INUSE);
196 usedSize += pArena->size & ARENA_SIZE_MASK;
197 }
198 }
199 DPRINTF( "\nTotal: Size=%08lx Committed=%08lx Free=%08lx Used=%08lx Arenas=%08lx (%ld%%)\n\n",
200 subheap->size, subheap->commitSize, freeSize, usedSize,
201 arenaSize, (arenaSize * 100) / subheap->size );
202 subheap = subheap->next;
203 }
204 }
205
206
207 /***********************************************************************
208 * HEAP_GetPtr
209 * RETURNS
210 * Pointer to the heap
211 * NULL: Failure
212 */
213 static HEAP *HEAP_GetPtr(
214 HANDLE heap /* [in] Handle to the heap */
215 ) {
216 HEAP *heapPtr = (HEAP *)heap;
217 if (!heapPtr || (heapPtr->magic != HEAP_MAGIC))
218 {
219 ERR("Invalid heap %08x!\n", heap );
220 SetLastError( ERROR_INVALID_HANDLE );
221 return NULL;
222 }
223 if (TRACE_ON(heap) && !HEAP_IsRealArena( heapPtr, 0, NULL, NOISY ))
224 {
225 HEAP_Dump( heapPtr );
226 assert( FALSE );
227 SetLastError( ERROR_INVALID_HANDLE );
228 return NULL;
229 }
230 return heapPtr;
231 }
232
233
234 /***********************************************************************
235 * HEAP_InsertFreeBlock
236 *
237 * Insert a free block into the free list.
238 */
239 static void HEAP_InsertFreeBlock( HEAP *heap, ARENA_FREE *pArena )
240 {
241 FREE_LIST_ENTRY *pEntry = heap->freeList;
242 while (pEntry->size < pArena->size) pEntry++;
243 pArena->size |= ARENA_FLAG_FREE;
244 pArena->next = pEntry->arena.next;
245 pArena->next->prev = pArena;
246 pArena->prev = &pEntry->arena;
247 pEntry->arena.next = pArena;
248 }
249
250
251 /***********************************************************************
252 * HEAP_FindSubHeap
253 * Find the sub-heap containing a given address.
254 *
255 * RETURNS
256 * Pointer: Success
257 * NULL: Failure
258 */
259 static SUBHEAP *HEAP_FindSubHeap(
260 HEAP *heap, /* [in] Heap pointer */
261 LPCVOID ptr /* [in] Address */
262 ) {
263 SUBHEAP *sub = &heap->subheap;
264 while (sub)
265 {
266 if (((char *)ptr >= (char *)sub) &&
267 ((char *)ptr < (char *)sub + sub->size)) return sub;
268 sub = sub->next;
269 }
270 return NULL;
271 }
272
273
274 /***********************************************************************
275 * HEAP_Commit
276 *
277 * Make sure the heap storage is committed up to (not including) ptr.
278 */
279 static inline BOOL HEAP_Commit( SUBHEAP *subheap, void *ptr )
280 {
281 DWORD size = (DWORD)((char *)ptr - (char *)subheap);
282 size = (size + COMMIT_MASK) & ~COMMIT_MASK;
283 if (size > subheap->size) size = subheap->size;
284 if (size <= subheap->commitSize) return TRUE;
285 if (!VirtualAlloc( (char *)subheap + subheap->commitSize,
286 size - subheap->commitSize, MEM_COMMIT,
287 PAGE_EXECUTE_READWRITE))
288 {
289 WARN("Could not commit %08lx bytes at %08lx for heap %08lx\n",
290 size - subheap->commitSize,
291 (DWORD)((char *)subheap + subheap->commitSize),
292 (DWORD)subheap->heap );
293 return FALSE;
294 }
295 subheap->commitSize = size;
296 return TRUE;
297 }
298
299
300 /***********************************************************************
301 * HEAP_Decommit
302 *
303 * If possible, decommit the heap storage from (including) 'ptr'.
304 */
305 static inline BOOL HEAP_Decommit( SUBHEAP *subheap, void *ptr )
306 {
307 DWORD size = (DWORD)((char *)ptr - (char *)subheap);
308 /* round to next block and add one full block */
309 size = ((size + COMMIT_MASK) & ~COMMIT_MASK) + COMMIT_MASK + 1;
310 if (size >= subheap->commitSize) return TRUE;
311 if (!VirtualFree( (char *)subheap + size,
312 subheap->commitSize - size, MEM_DECOMMIT ))
313 {
314 WARN("Could not decommit %08lx bytes at %08lx for heap %08lx\n",
315 subheap->commitSize - size,
316 (DWORD)((char *)subheap + size),
317 (DWORD)subheap->heap );
318 return FALSE;
319 }
320 subheap->commitSize = size;
321 return TRUE;
322 }
323
324
325 /***********************************************************************
326 * HEAP_CreateFreeBlock
327 *
328 * Create a free block at a specified address. 'size' is the size of the
329 * whole block, including the new arena.
330 */
331 static void HEAP_CreateFreeBlock( SUBHEAP *subheap, void *ptr, DWORD size )
332 {
333 ARENA_FREE *pFree;
334
335 /* Create a free arena */
336
337 pFree = (ARENA_FREE *)ptr;
338 pFree->threadId = GetCurrentTask();
339 pFree->magic = ARENA_FREE_MAGIC;
340
341 /* If debugging, erase the freed block content */
342
343 if (TRACE_ON(heap))
344 {
345 char *pEnd = (char *)ptr + size;
346 if (pEnd > (char *)subheap + subheap->commitSize)
347 pEnd = (char *)subheap + subheap->commitSize;
348 if (pEnd > (char *)(pFree + 1))
349 memset( pFree + 1, ARENA_FREE_FILLER, pEnd - (char *)(pFree + 1) );
350 }
351
352 /* Check if next block is free also */
353
354 if (((char *)ptr + size < (char *)subheap + subheap->size) &&
355 (*(DWORD *)((char *)ptr + size) & ARENA_FLAG_FREE))
356 {
357 /* Remove the next arena from the free list */
358 ARENA_FREE *pNext = (ARENA_FREE *)((char *)ptr + size);
359 pNext->next->prev = pNext->prev;
360 pNext->prev->next = pNext->next;
361 size += (pNext->size & ARENA_SIZE_MASK) + sizeof(*pNext);
362 if (TRACE_ON(heap))
363 memset( pNext, ARENA_FREE_FILLER, sizeof(ARENA_FREE) );
364 }
365
366 /* Set the next block PREV_FREE flag and pointer */
367
368 if ((char *)ptr + size < (char *)subheap + subheap->size)
369 {
370 DWORD *pNext = (DWORD *)((char *)ptr + size);
371 *pNext |= ARENA_FLAG_PREV_FREE;
372 *(ARENA_FREE **)(pNext - 1) = pFree;
373 }
374
375 /* Last, insert the new block into the free list */
376
377 pFree->size = size - sizeof(*pFree);
378 HEAP_InsertFreeBlock( subheap->heap, pFree );
379 }
380
381
382 /***********************************************************************
383 * HEAP_MakeInUseBlockFree
384 *
385 * Turn an in-use block into a free block. Can also decommit the end of
386 * the heap, and possibly even free the sub-heap altogether.
387 */
388 static void HEAP_MakeInUseBlockFree( SUBHEAP *subheap, ARENA_INUSE *pArena )
389 {
390 ARENA_FREE *pFree;
391 DWORD size = (pArena->size & ARENA_SIZE_MASK) + sizeof(*pArena);
392
393 /* Check if we can merge with previous block */
394
395 if (pArena->size & ARENA_FLAG_PREV_FREE)
396 {
397 pFree = *((ARENA_FREE **)pArena - 1);
398 size += (pFree->size & ARENA_SIZE_MASK) + sizeof(ARENA_FREE);
399 /* Remove it from the free list */
400 pFree->next->prev = pFree->prev;
401 pFree->prev->next = pFree->next;
402 }
403 else pFree = (ARENA_FREE *)pArena;
404
405 /* Create a free block */
406
407 HEAP_CreateFreeBlock( subheap, pFree, size );
408 size = (pFree->size & ARENA_SIZE_MASK) + sizeof(ARENA_FREE);
409 if ((char *)pFree + size < (char *)subheap + subheap->size)
410 return; /* Not the last block, so nothing more to do */
411
412 /* Free the whole sub-heap if it's empty and not the original one */
413
414 if (((char *)pFree == (char *)subheap + subheap->headerSize) &&
415 (subheap != &subheap->heap->subheap))
416 {
417 SUBHEAP *pPrev = &subheap->heap->subheap;
418 /* Remove the free block from the list */
419 pFree->next->prev = pFree->prev;
420 pFree->prev->next = pFree->next;
421 /* Remove the subheap from the list */
422 while (pPrev && (pPrev->next != subheap)) pPrev = pPrev->next;
423 if (pPrev) pPrev->next = subheap->next;
424 /* Free the memory */
425 subheap->magic = 0;
426 if (subheap->selector) FreeSelector16( subheap->selector );
427 VirtualFree( subheap, 0, MEM_RELEASE );
428 return;
429 }
430
431 /* Decommit the end of the heap */
432
433 if (!(subheap->heap->flags & HEAP_SHARED)) HEAP_Decommit( subheap, pFree + 1 );
434 }
435
436
437 /***********************************************************************
438 * HEAP_ShrinkBlock
439 *
440 * Shrink an in-use block.
441 */
442 static void HEAP_ShrinkBlock(SUBHEAP *subheap, ARENA_INUSE *pArena, DWORD size)
443 {
444 if ((pArena->size & ARENA_SIZE_MASK) >= size + HEAP_MIN_BLOCK_SIZE)
445 {
446 HEAP_CreateFreeBlock( subheap, (char *)(pArena + 1) + size,
447 (pArena->size & ARENA_SIZE_MASK) - size );
448 /* assign size plus previous arena flags */
449 pArena->size = size | (pArena->size & ~ARENA_SIZE_MASK);
450 }
451 else
452 {
453 /* Turn off PREV_FREE flag in next block */
454 char *pNext = (char *)(pArena + 1) + (pArena->size & ARENA_SIZE_MASK);
455 if (pNext < (char *)subheap + subheap->size)
456 *(DWORD *)pNext &= ~ARENA_FLAG_PREV_FREE;
457 }
458 }
459
460 /***********************************************************************
461 * HEAP_InitSubHeap
462 */
463 static BOOL HEAP_InitSubHeap( HEAP *heap, LPVOID address, DWORD flags,
464 DWORD commitSize, DWORD totalSize )
465 {
466 SUBHEAP *subheap = (SUBHEAP *)address;
467 WORD selector = 0;
468 FREE_LIST_ENTRY *pEntry;
469 int i;
470
471 /* Commit memory */
472
473 if (flags & HEAP_SHARED)
474 commitSize = totalSize; /* always commit everything in a shared heap */
475 if (!VirtualAlloc(address, commitSize, MEM_COMMIT, PAGE_EXECUTE_READWRITE))
476 {
477 WARN("Could not commit %08lx bytes for sub-heap %08lx\n",
478 commitSize, (DWORD)address );
479 return FALSE;
480 }
481
482 /* Allocate a selector if needed */
483
484 if (flags & HEAP_WINE_SEGPTR)
485 {
486 unsigned char selflags = WINE_LDT_FLAGS_DATA;
487
488 if (flags & (HEAP_WINE_CODESEG | HEAP_WINE_CODE16SEG))
489 selflags = WINE_LDT_FLAGS_CODE;
490 if (flags & HEAP_WINE_CODESEG)
491 selflags |= WINE_LDT_FLAGS_32BIT;
492 selector = SELECTOR_AllocBlock( address, totalSize, selflags );
493 if (!selector)
494 {
495 ERR("Could not allocate selector\n" );
496 return FALSE;
497 }
498 }
499
500 /* Fill the sub-heap structure */
501
502 subheap->heap = heap;
503 subheap->selector = selector;
504 subheap->size = totalSize;
505 subheap->commitSize = commitSize;
506 subheap->magic = SUBHEAP_MAGIC;
507
508 if ( subheap != (SUBHEAP *)heap )
509 {
510 /* If this is a secondary subheap, insert it into list */
511
512 subheap->headerSize = sizeof(SUBHEAP);
513 subheap->next = heap->subheap.next;
514 heap->subheap.next = subheap;
515 }
516 else
517 {
518 /* If this is a primary subheap, initialize main heap */
519
520 subheap->headerSize = sizeof(HEAP);
521 subheap->next = NULL;
522 heap->next = NULL;
523 heap->flags = flags;
524 heap->magic = HEAP_MAGIC;
525
526 /* Build the free lists */
527
528 for (i = 0, pEntry = heap->freeList; i < HEAP_NB_FREE_LISTS; i++, pEntry++)
529 {
530 pEntry->size = HEAP_freeListSizes[i];
531 pEntry->arena.size = 0 | ARENA_FLAG_FREE;
532 pEntry->arena.next = i < HEAP_NB_FREE_LISTS-1 ?
533 &heap->freeList[i+1].arena : &heap->freeList[0].arena;
534 pEntry->arena.prev = i ? &heap->freeList[i-1].arena :
535 &heap->freeList[HEAP_NB_FREE_LISTS-1].arena;
536 pEntry->arena.threadId = 0;
537 pEntry->arena.magic = ARENA_FREE_MAGIC;
538 }
539
540 /* Initialize critical section */
541
542 InitializeCriticalSection( &heap->critSection );
543 if (!SystemHeap) MakeCriticalSectionGlobal( &heap->critSection );
544 }
545
546 /* Create the first free block */
547
548 HEAP_CreateFreeBlock( subheap, (LPBYTE)subheap + subheap->headerSize,
549 subheap->size - subheap->headerSize );
550
551 return TRUE;
552 }
553
554 /***********************************************************************
555 * HEAP_CreateSubHeap
556 *
557 * Create a sub-heap of the given size.
558 * If heap == NULL, creates a main heap.
559 */
560 static SUBHEAP *HEAP_CreateSubHeap( HEAP *heap, DWORD flags,
561 DWORD commitSize, DWORD totalSize )
562 {
563 LPVOID address;
564
565 /* Round-up sizes on a 64K boundary */
566
567 if (flags & HEAP_WINE_SEGPTR)
568 {
569 totalSize = commitSize = 0x10000; /* Only 64K at a time for SEGPTRs */
570 }
571 else
572 {
573 totalSize = (totalSize + 0xffff) & 0xffff0000;
574 commitSize = (commitSize + 0xffff) & 0xffff0000;
575 if (!commitSize) commitSize = 0x10000;
576 if (totalSize < commitSize) totalSize = commitSize;
577 }
578
579 /* Allocate the memory block */
580
581 if (!(address = VirtualAlloc( NULL, totalSize,
582 MEM_RESERVE, PAGE_EXECUTE_READWRITE )))
583 {
584 WARN("Could not VirtualAlloc %08lx bytes\n",
585 totalSize );
586 return NULL;
587 }
588
589 /* Initialize subheap */
590
591 if (!HEAP_InitSubHeap( heap? heap : (HEAP *)address,
592 address, flags, commitSize, totalSize ))
593 {
594 VirtualFree( address, 0, MEM_RELEASE );
595 return NULL;
596 }
597
598 return (SUBHEAP *)address;
599 }
600
601
602 /***********************************************************************
603 * HEAP_FindFreeBlock
604 *
605 * Find a free block at least as large as the requested size, and make sure
606 * the requested size is committed.
607 */
608 static ARENA_FREE *HEAP_FindFreeBlock( HEAP *heap, DWORD size,
609 SUBHEAP **ppSubHeap )
610 {
611 SUBHEAP *subheap;
612 ARENA_FREE *pArena;
613 FREE_LIST_ENTRY *pEntry = heap->freeList;
614
615 /* Find a suitable free list, and in it find a block large enough */
616
617 while (pEntry->size < size) pEntry++;
618 pArena = pEntry->arena.next;
619 while (pArena != &heap->freeList[0].arena)
620 {
621 if (pArena->size > size)
622 {
623 subheap = HEAP_FindSubHeap( heap, pArena );
624 if (!HEAP_Commit( subheap, (char *)pArena + sizeof(ARENA_INUSE)
625 + size + HEAP_MIN_BLOCK_SIZE))
626 return NULL;
627 *ppSubHeap = subheap;
628 return pArena;
629 }
630
631 pArena = pArena->next;
632 }
633
634 /* If no block was found, attempt to grow the heap */
635
636 if (!(heap->flags & HEAP_GROWABLE))
637 {
638 WARN("Not enough space in heap %08lx for %08lx bytes\n",
639 (DWORD)heap, size );
640 return NULL;
641 }
642 /* make sure that we have a big enough size *committed* to fit another
643 * last free arena in !
644 * So just one heap struct, one first free arena which will eventually
645 * get inuse, and HEAP_MIN_BLOCK_SIZE for the second free arena that
646 * might get assigned all remaining free space in HEAP_ShrinkBlock() */
647 size += sizeof(SUBHEAP) + sizeof(ARENA_INUSE) + HEAP_MIN_BLOCK_SIZE;
648 if (!(subheap = HEAP_CreateSubHeap( heap, heap->flags, size,
649 max( HEAP_DEF_SIZE, size ) )))
650 return NULL;
651
652 TRACE("created new sub-heap %08lx of %08lx bytes for heap %08lx\n",
653 (DWORD)subheap, size, (DWORD)heap );
654
655 *ppSubHeap = subheap;
656 return (ARENA_FREE *)(subheap + 1);
657 }
658
659
660 /***********************************************************************
661 * HEAP_IsValidArenaPtr
662 *
663 * Check that the pointer is inside the range possible for arenas.
664 */
665 static BOOL HEAP_IsValidArenaPtr( HEAP *heap, void *ptr )
666 {
667 int i;
668 SUBHEAP *subheap = HEAP_FindSubHeap( heap, ptr );
669 if (!subheap) return FALSE;
670 if ((char *)ptr >= (char *)subheap + subheap->headerSize) return TRUE;
671 if (subheap != &heap->subheap) return FALSE;
672 for (i = 0; i < HEAP_NB_FREE_LISTS; i++)
673 if (ptr == (void *)&heap->freeList[i].arena) return TRUE;
674 return FALSE;
675 }
676
677
678 /***********************************************************************
679 * HEAP_ValidateFreeArena
680 */
681 static BOOL HEAP_ValidateFreeArena( SUBHEAP *subheap, ARENA_FREE *pArena )
682 {
683 char *heapEnd = (char *)subheap + subheap->size;
684
685 /* Check magic number */
686 if (pArena->magic != ARENA_FREE_MAGIC)
687 {
688 ERR("Heap %08lx: invalid free arena magic for %08lx\n",
689 (DWORD)subheap->heap, (DWORD)pArena );
690 return FALSE;
691 }
692 /* Check size flags */
693 if (!(pArena->size & ARENA_FLAG_FREE) ||
694 (pArena->size & ARENA_FLAG_PREV_FREE))
695 {
696 ERR("Heap %08lx: bad flags %lx for free arena %08lx\n",
697 (DWORD)subheap->heap, pArena->size & ~ARENA_SIZE_MASK, (DWORD)pArena );
698 }
699 /* Check arena size */
700 if ((char *)(pArena + 1) + (pArena->size & ARENA_SIZE_MASK) > heapEnd)
701 {
702 ERR("Heap %08lx: bad size %08lx for free arena %08lx\n",
703 (DWORD)subheap->heap, (DWORD)pArena->size & ARENA_SIZE_MASK, (DWORD)pArena );
704 return FALSE;
705 }
706 /* Check that next pointer is valid */
707 if (!HEAP_IsValidArenaPtr( subheap->heap, pArena->next ))
708 {
709 ERR("Heap %08lx: bad next ptr %08lx for arena %08lx\n",
710 (DWORD)subheap->heap, (DWORD)pArena->next, (DWORD)pArena );
711 return FALSE;
712 }
713 /* Check that next arena is free */
714 if (!(pArena->next->size & ARENA_FLAG_FREE) ||
715 (pArena->next->magic != ARENA_FREE_MAGIC))
716 {
717 ERR("Heap %08lx: next arena %08lx invalid for %08lx\n",
718 (DWORD)subheap->heap, (DWORD)pArena->next, (DWORD)pArena );
719 return FALSE;
720 }
721 /* Check that prev pointer is valid */
722 if (!HEAP_IsValidArenaPtr( subheap->heap, pArena->prev ))
723 {
724 ERR("Heap %08lx: bad prev ptr %08lx for arena %08lx\n",
725 (DWORD)subheap->heap, (DWORD)pArena->prev, (DWORD)pArena );
726 return FALSE;
727 }
728 /* Check that prev arena is free */
729 if (!(pArena->prev->size & ARENA_FLAG_FREE) ||
730 (pArena->prev->magic != ARENA_FREE_MAGIC))
731 {
732 /* this often means that the prev arena got overwritten
733 * by a memory write before that prev arena */
734 ERR("Heap %08lx: prev arena %08lx invalid for %08lx\n",
735 (DWORD)subheap->heap, (DWORD)pArena->prev, (DWORD)pArena );
736 return FALSE;
737 }
738 /* Check that next block has PREV_FREE flag */
739 if ((char *)(pArena + 1) + (pArena->size & ARENA_SIZE_MASK) < heapEnd)
740 {
741 if (!(*(DWORD *)((char *)(pArena + 1) +
742 (pArena->size & ARENA_SIZE_MASK)) & ARENA_FLAG_PREV_FREE))
743 {
744 ERR("Heap %08lx: free arena %08lx next block has no PREV_FREE flag\n",
745 (DWORD)subheap->heap, (DWORD)pArena );
746 return FALSE;
747 }
748 /* Check next block back pointer */
749 if (*((ARENA_FREE **)((char *)(pArena + 1) +
750 (pArena->size & ARENA_SIZE_MASK)) - 1) != pArena)
751 {
752 ERR("Heap %08lx: arena %08lx has wrong back ptr %08lx\n",
753 (DWORD)subheap->heap, (DWORD)pArena,
754 *((DWORD *)((char *)(pArena+1)+ (pArena->size & ARENA_SIZE_MASK)) - 1));
755 return FALSE;
756 }
757 }
758 return TRUE;
759 }
760
761
762 /***********************************************************************
763 * HEAP_ValidateInUseArena
764 */
765 static BOOL HEAP_ValidateInUseArena( SUBHEAP *subheap, ARENA_INUSE *pArena, BOOL quiet )
766 {
767 char *heapEnd = (char *)subheap + subheap->size;
768
769 /* Check magic number */
770 if (pArena->magic != ARENA_INUSE_MAGIC)
771 {
772 if (quiet == NOISY) {
773 ERR("Heap %08lx: invalid in-use arena magic for %08lx\n",
774 (DWORD)subheap->heap, (DWORD)pArena );
775 if (TRACE_ON(heap))
776 HEAP_Dump( subheap->heap );
777 } else if (WARN_ON(heap)) {
778 WARN("Heap %08lx: invalid in-use arena magic for %08lx\n",
779 (DWORD)subheap->heap, (DWORD)pArena );
780 if (TRACE_ON(heap))
781 HEAP_Dump( subheap->heap );
782 }
783 return FALSE;
784 }
785 /* Check size flags */
786 if (pArena->size & ARENA_FLAG_FREE)
787 {
788 ERR("Heap %08lx: bad flags %lx for in-use arena %08lx\n",
789 (DWORD)subheap->heap, pArena->size & ~ARENA_SIZE_MASK, (DWORD)pArena );
790 }
791 /* Check arena size */
792 if ((char *)(pArena + 1) + (pArena->size & ARENA_SIZE_MASK) > heapEnd)
793 {
794 ERR("Heap %08lx: bad size %08lx for in-use arena %08lx\n",
795 (DWORD)subheap->heap, (DWORD)pArena->size & ARENA_SIZE_MASK, (DWORD)pArena );
796 return FALSE;
797 }
798 /* Check next arena PREV_FREE flag */
799 if (((char *)(pArena + 1) + (pArena->size & ARENA_SIZE_MASK) < heapEnd) &&
800 (*(DWORD *)((char *)(pArena + 1) + (pArena->size & ARENA_SIZE_MASK)) & ARENA_FLAG_PREV_FREE))
801 {
802 ERR("Heap %08lx: in-use arena %08lx next block has PREV_FREE flag\n",
803 (DWORD)subheap->heap, (DWORD)pArena );
804 return FALSE;
805 }
806 /* Check prev free arena */
807 if (pArena->size & ARENA_FLAG_PREV_FREE)
808 {
809 ARENA_FREE *pPrev = *((ARENA_FREE **)pArena - 1);
810 /* Check prev pointer */
811 if (!HEAP_IsValidArenaPtr( subheap->heap, pPrev ))
812 {
813 ERR("Heap %08lx: bad back ptr %08lx for arena %08lx\n",
814 (DWORD)subheap->heap, (DWORD)pPrev, (DWORD)pArena );
815 return FALSE;
816 }
817 /* Check that prev arena is free */
818 if (!(pPrev->size & ARENA_FLAG_FREE) ||
819 (pPrev->magic != ARENA_FREE_MAGIC))
820 {
821 ERR("Heap %08lx: prev arena %08lx invalid for in-use %08lx\n",
822 (DWORD)subheap->heap, (DWORD)pPrev, (DWORD)pArena );
823 return FALSE;
824 }
825 /* Check that prev arena is really the previous block */
826 if ((char *)(pPrev + 1) + (pPrev->size & ARENA_SIZE_MASK) != (char *)pArena)
827 {
828 ERR("Heap %08lx: prev arena %08lx is not prev for in-use %08lx\n",
829 (DWORD)subheap->heap, (DWORD)pPrev, (DWORD)pArena );
830 return FALSE;
831 }
832 }
833 return TRUE;
834 }
835
836
837 /***********************************************************************
838 * HEAP_GetSegptr
839 *
840 * Transform a linear pointer into a SEGPTR. The pointer must have been
841 * allocated from a HEAP_WINE_SEGPTR heap.
842 */
843 SEGPTR HEAP_GetSegptr( HANDLE heap, DWORD flags, LPCVOID ptr )
844 {
845 HEAP *heapPtr = HEAP_GetPtr( heap );
846 SUBHEAP *subheap;
847 SEGPTR ret = 0;
848
849 /* Validate the parameters */
850
851 if (!heapPtr) return 0;
852 flags |= heapPtr->flags;
853 if (!(flags & HEAP_WINE_SEGPTR))
854 {
855 ERR("Heap %08x is not a SEGPTR heap\n",
856 heap );
857 return 0;
858 }
859 if (!(flags & HEAP_NO_SERIALIZE)) EnterCriticalSection( &heapPtr->critSection );
860
861 /* Get the subheap */
862
863 if ((subheap = HEAP_FindSubHeap( heapPtr, ptr )))
864 ret = MAKESEGPTR(subheap->selector, (char *)ptr - (char *)subheap);
865
866 if (!(flags & HEAP_NO_SERIALIZE)) LeaveCriticalSection( &heapPtr->critSection );
867 return ret;
868 }
869
870 /***********************************************************************
871 * MapLS (KERNEL32.522)
872 *
873 * Maps linear pointer to segmented.
874 */
875 SEGPTR WINAPI MapLS( LPCVOID ptr )
876 {
877 SUBHEAP *subheap;
878 SEGPTR ret = 0;
879
880 if (!HIWORD(ptr)) return (SEGPTR)ptr;
881
882 /* check if the pointer is inside the segptr heap */
883 EnterCriticalSection( &segptrHeap->critSection );
884 if ((subheap = HEAP_FindSubHeap( segptrHeap, ptr )))
885 ret = MAKESEGPTR( subheap->selector, (char *)ptr - (char *)subheap );
886 LeaveCriticalSection( &segptrHeap->critSection );
887
888 /* otherwise, allocate a brand-new selector */
889 if (!ret)
890 {
891 WORD sel = SELECTOR_AllocBlock( ptr, 0x10000, WINE_LDT_FLAGS_DATA );
892 ret = MAKESEGPTR( sel, 0 );
893 }
894 return ret;
895 }
896
897
898 /***********************************************************************
899 * UnMapLS (KERNEL32.700)
900 *
901 * Free mapped selector.
902 */
903 void WINAPI UnMapLS( SEGPTR sptr )
904 {
905 SUBHEAP *subheap;
906 if (!SELECTOROF(sptr)) return;
907
908 /* check if ptr is inside segptr heap */
909 EnterCriticalSection( &segptrHeap->critSection );
910 subheap = HEAP_FindSubHeap( segptrHeap, MapSL(sptr) );
911 if ((subheap) && (subheap->selector != SELECTOROF(sptr))) subheap = NULL;
912 LeaveCriticalSection( &segptrHeap->critSection );
913 /* if not inside heap, free the selector */
914 if (!subheap) FreeSelector16( SELECTOROF(sptr) );
915 }
916
917 /***********************************************************************
918 * HEAP_IsRealArena [Internal]
919 * Validates a block is a valid arena.
920 *
921 * RETURNS
922 * TRUE: Success
923 * FALSE: Failure
924 */
925 static BOOL HEAP_IsRealArena( HEAP *heapPtr, /* [in] ptr to the heap */
926 DWORD flags, /* [in] Bit flags that control access during operation */
927 LPCVOID block, /* [in] Optional pointer to memory block to validate */
928 BOOL quiet ) /* [in] Flag - if true, HEAP_ValidateInUseArena
929 * does not complain */
930 {
931 SUBHEAP *subheap;
932 BOOL ret = TRUE;
933
934 if (!heapPtr || (heapPtr->magic != HEAP_MAGIC))
935 {
936 ERR("Invalid heap %p!\n", heapPtr );
937 return FALSE;
938 }
939
940 flags &= HEAP_NO_SERIALIZE;
941 flags |= heapPtr->flags;
942 /* calling HeapLock may result in infinite recursion, so do the critsect directly */
943 if (!(flags & HEAP_NO_SERIALIZE))
944 EnterCriticalSection( &heapPtr->critSection );
945
946 if (block)
947 {
948 /* Only check this single memory block */
949
950 if (!(subheap = HEAP_FindSubHeap( heapPtr, block )) ||
951 ((char *)block < (char *)subheap + subheap->headerSize
952 + sizeof(ARENA_INUSE)))
953 {
954 if (quiet == NOISY)
955 ERR("Heap %p: block %p is not inside heap\n", heapPtr, block );
956 else if (WARN_ON(heap))
957 WARN("Heap %p: block %p is not inside heap\n", heapPtr, block );
958 ret = FALSE;
959 } else
960 ret = HEAP_ValidateInUseArena( subheap, (ARENA_INUSE *)block - 1, quiet );
961
962 if (!(flags & HEAP_NO_SERIALIZE))
963 LeaveCriticalSection( &heapPtr->critSection );
964 return ret;
965 }
966
967 subheap = &heapPtr->subheap;
968 while (subheap && ret)
969 {
970 char *ptr = (char *)subheap + subheap->headerSize;
971 while (ptr < (char *)subheap + subheap->size)
972 {
973 if (*(DWORD *)ptr & ARENA_FLAG_FREE)
974 {
975 if (!HEAP_ValidateFreeArena( subheap, (ARENA_FREE *)ptr )) {
976 ret = FALSE;
977 break;
978 }
979 ptr += sizeof(ARENA_FREE) + (*(DWORD *)ptr & ARENA_SIZE_MASK);
980 }
981 else
982 {
983 if (!HEAP_ValidateInUseArena( subheap, (ARENA_INUSE *)ptr, NOISY )) {
984 ret = FALSE;
985 break;
986 }
987 ptr += sizeof(ARENA_INUSE) + (*(DWORD *)ptr & ARENA_SIZE_MASK);
988 }
989 }
990 subheap = subheap->next;
991 }
992
993 if (!(flags & HEAP_NO_SERIALIZE))
994 LeaveCriticalSection( &heapPtr->critSection );
995 return ret;
996 }
997
998
999 /***********************************************************************
1000 * HeapCreate (KERNEL32.336)
1001 * RETURNS
1002 * Handle of heap: Success
1003 * NULL: Failure
1004 */
1005 HANDLE WINAPI HeapCreate(
1006 DWORD flags, /* [in] Heap allocation flag */
1007 DWORD initialSize, /* [in] Initial heap size */
1008 DWORD maxSize /* [in] Maximum heap size */
1009 ) {
1010 SUBHEAP *subheap;
1011
1012 if ( flags & HEAP_SHARED ) {
1013 WARN( "Shared Heap requested, returning system heap.\n" );
1014 return SystemHeap;
1015 }
1016
1017 /* Allocate the heap block */
1018
1019 if (!maxSize)
1020 {
1021 maxSize = HEAP_DEF_SIZE;
1022 flags |= HEAP_GROWABLE;
1023 }
1024 if (!(subheap = HEAP_CreateSubHeap( NULL, flags, initialSize, maxSize )))
1025 {
1026 SetLastError( ERROR_OUTOFMEMORY );
1027 return 0;
1028 }
1029
1030 /* link it into the per-process heap list */
1031 if (processHeap)
1032 {
1033 HEAP *heapPtr = subheap->heap;
1034 EnterCriticalSection( &processHeap->critSection );
1035 heapPtr->next = firstHeap;
1036 firstHeap = heapPtr;
1037 LeaveCriticalSection( &processHeap->critSection );
1038 }
1039 else /* assume the first heap we create is the process main heap */
1040 {
1041 SUBHEAP *segptr;
1042 processHeap = subheap->heap;
1043 /* create the SEGPTR heap */
1044 if (!(segptr = HEAP_CreateSubHeap( NULL, flags|HEAP_WINE_SEGPTR|HEAP_GROWABLE, 0, 0 )))
1045 {
1046 SetLastError( ERROR_OUTOFMEMORY );
1047 return 0;
1048 }
1049 segptrHeap = segptr->heap;
1050 }
1051 return (HANDLE)subheap;
1052 }
1053
1054 /***********************************************************************
1055 * HeapDestroy (KERNEL32.337)
1056 * RETURNS
1057 * TRUE: Success
1058 * FALSE: Failure
1059 */
1060 BOOL WINAPI HeapDestroy( HANDLE heap /* [in] Handle of heap */ )
1061 {
1062 HEAP *heapPtr = HEAP_GetPtr( heap );
1063 SUBHEAP *subheap;
1064
1065 if ( heap == SystemHeap ) {
1066 WARN( "attempt to destroy system heap, returning TRUE!\n" );
1067 return TRUE;
1068 }
1069
1070 TRACE("%08x\n", heap );
1071 if (!heapPtr) return FALSE;
1072
1073 if (heapPtr == processHeap) /* cannot delete the main process heap */
1074 {
1075 SetLastError( ERROR_INVALID_PARAMETER );
1076 return FALSE;
1077 }
1078 else /* remove it from the per-process list */
1079 {
1080 HEAP **pptr;
1081 EnterCriticalSection( &processHeap->critSection );
1082 pptr = &firstHeap;
1083 while (*pptr && *pptr != heapPtr) pptr = &(*pptr)->next;
1084 if (*pptr) *pptr = (*pptr)->next;
1085 LeaveCriticalSection( &processHeap->critSection );
1086 }
1087
1088 DeleteCriticalSection( &heapPtr->critSection );
1089 subheap = &heapPtr->subheap;
1090 while (subheap)
1091 {
1092 SUBHEAP *next = subheap->next;
1093 if (subheap->selector) FreeSelector16( subheap->selector );
1094 VirtualFree( subheap, 0, MEM_RELEASE );
1095 subheap = next;
1096 }
1097 return TRUE;
1098 }
1099
1100
1101 /***********************************************************************
1102 * HeapAlloc (KERNEL32.334)
1103 * RETURNS
1104 * Pointer to allocated memory block
1105 * NULL: Failure
1106 */
1107 LPVOID WINAPI HeapAlloc(
1108 HANDLE heap, /* [in] Handle of private heap block */
1109 DWORD flags, /* [in] Heap allocation control flags */
1110 DWORD size /* [in] Number of bytes to allocate */
1111 ) {
1112 ARENA_FREE *pArena;
1113 ARENA_INUSE *pInUse;
1114 SUBHEAP *subheap;
1115 HEAP *heapPtr = HEAP_GetPtr( heap );
1116
1117 /* Validate the parameters */
1118
1119 if ((flags & HEAP_WINE_SEGPTR) && size < 0x10000) heapPtr = segptrHeap;
1120 if (!heapPtr) return NULL;
1121 flags &= HEAP_GENERATE_EXCEPTIONS | HEAP_NO_SERIALIZE | HEAP_ZERO_MEMORY;
1122 flags |= heapPtr->flags;
1123 size = (size + 3) & ~3;
1124 if (size < HEAP_MIN_BLOCK_SIZE) size = HEAP_MIN_BLOCK_SIZE;
1125
1126 if (!(flags & HEAP_NO_SERIALIZE)) EnterCriticalSection( &heapPtr->critSection );
1127 /* Locate a suitable free block */
1128
1129 if (!(pArena = HEAP_FindFreeBlock( heapPtr, size, &subheap )))
1130 {
1131 TRACE("(%08x,%08lx,%08lx): returning NULL\n",
1132 heap, flags, size );
1133 if (!(flags & HEAP_NO_SERIALIZE)) LeaveCriticalSection( &heapPtr->critSection );
1134 SetLastError( ERROR_COMMITMENT_LIMIT );
1135 return NULL;
1136 }
1137
1138 /* Remove the arena from the free list */
1139
1140 pArena->next->prev = pArena->prev;
1141 pArena->prev->next = pArena->next;
1142
1143 /* Build the in-use arena */
1144
1145 pInUse = (ARENA_INUSE *)pArena;
1146
1147 /* in-use arena is smaller than free arena,
1148 * so we have to add the difference to the size */
1149 pInUse->size = (pInUse->size & ~ARENA_FLAG_FREE)
1150 + sizeof(ARENA_FREE) - sizeof(ARENA_INUSE);
1151 pInUse->callerEIP = GET_EIP();
1152 pInUse->threadId = GetCurrentTask();
1153 pInUse->magic = ARENA_INUSE_MAGIC;
1154
1155 /* Shrink the block */
1156
1157 HEAP_ShrinkBlock( subheap, pInUse, size );
1158
1159 if (flags & HEAP_ZERO_MEMORY)
1160 memset( pInUse + 1, 0, pInUse->size & ARENA_SIZE_MASK );
1161 else if (TRACE_ON(heap))
1162 memset( pInUse + 1, ARENA_INUSE_FILLER, pInUse->size & ARENA_SIZE_MASK );
1163
1164 if (!(flags & HEAP_NO_SERIALIZE)) LeaveCriticalSection( &heapPtr->critSection );
1165
1166 TRACE("(%08x,%08lx,%08lx): returning %08lx\n",
1167 heap, flags, size, (DWORD)(pInUse + 1) );
1168 return (LPVOID)(pInUse + 1);
1169 }
1170
1171
1172 /***********************************************************************
1173 * HeapFree (KERNEL32.338)
1174 * RETURNS
1175 * TRUE: Success
1176 * FALSE: Failure
1177 */
1178 BOOL WINAPI HeapFree(
1179 HANDLE heap, /* [in] Handle of heap */
1180 DWORD flags, /* [in] Heap freeing flags */
1181 LPVOID ptr /* [in] Address of memory to free */
1182 ) {
1183 ARENA_INUSE *pInUse;
1184 SUBHEAP *subheap;
1185 HEAP *heapPtr = HEAP_GetPtr( heap );
1186
1187 /* Validate the parameters */
1188
1189 if (!ptr) return TRUE; /* freeing a NULL ptr is doesn't indicate an error in Win2k */
1190 if (flags & HEAP_WINE_SEGPTR) heapPtr = segptrHeap;
1191 if (!heapPtr) return FALSE;
1192
1193 flags &= HEAP_NO_SERIALIZE;
1194 flags |= heapPtr->flags;
1195 if (!(flags & HEAP_NO_SERIALIZE)) EnterCriticalSection( &heapPtr->critSection );
1196 if (!HEAP_IsRealArena( heapPtr, HEAP_NO_SERIALIZE, ptr, QUIET ))
1197 {
1198 if (!(flags & HEAP_NO_SERIALIZE)) LeaveCriticalSection( &heapPtr->critSection );
1199 SetLastError( ERROR_INVALID_PARAMETER );
1200 TRACE("(%08x,%08lx,%08lx): returning FALSE\n",
1201 heap, flags, (DWORD)ptr );
1202 return FALSE;
1203 }
1204
1205 /* Turn the block into a free block */
1206
1207 pInUse = (ARENA_INUSE *)ptr - 1;
1208 subheap = HEAP_FindSubHeap( heapPtr, pInUse );
1209 HEAP_MakeInUseBlockFree( subheap, pInUse );
1210
1211 if (!(flags & HEAP_NO_SERIALIZE)) LeaveCriticalSection( &heapPtr->critSection );
1212
1213 TRACE("(%08x,%08lx,%08lx): returning TRUE\n",
1214 heap, flags, (DWORD)ptr );
1215 return TRUE;
1216 }
1217
1218
1219 /***********************************************************************
1220 * HeapReAlloc (KERNEL32.340)
1221 * RETURNS
1222 * Pointer to reallocated memory block
1223 * NULL: Failure
1224 */
1225 LPVOID WINAPI HeapReAlloc(
1226 HANDLE heap, /* [in] Handle of heap block */
1227 DWORD flags, /* [in] Heap reallocation flags */
1228 LPVOID ptr, /* [in] Address of memory to reallocate */
1229 DWORD size /* [in] Number of bytes to reallocate */
1230 ) {
1231 ARENA_INUSE *pArena;
1232 DWORD oldSize;
1233 HEAP *heapPtr;
1234 SUBHEAP *subheap;
1235
1236 if (!ptr) return HeapAlloc( heap, flags, size ); /* FIXME: correct? */
1237 if ((flags & HEAP_WINE_SEGPTR) && size < 0x10000) heapPtr = segptrHeap;
1238 if (!(heapPtr = HEAP_GetPtr( heap ))) return FALSE;
1239
1240 /* Validate the parameters */
1241
1242 flags &= HEAP_GENERATE_EXCEPTIONS | HEAP_NO_SERIALIZE | HEAP_ZERO_MEMORY |
1243 HEAP_REALLOC_IN_PLACE_ONLY;
1244 flags |= heapPtr->flags;
1245 size = (size + 3) & ~3;
1246 if (size < HEAP_MIN_BLOCK_SIZE) size = HEAP_MIN_BLOCK_SIZE;
1247
1248 if (!(flags & HEAP_NO_SERIALIZE)) EnterCriticalSection( &heapPtr->critSection );
1249 if (!HEAP_IsRealArena( heapPtr, HEAP_NO_SERIALIZE, ptr, QUIET ))
1250 {
1251 if (!(flags & HEAP_NO_SERIALIZE)) LeaveCriticalSection( &heapPtr->critSection );
1252 SetLastError( ERROR_INVALID_PARAMETER );
1253 TRACE("(%08x,%08lx,%08lx,%08lx): returning NULL\n",
1254 heap, flags, (DWORD)ptr, size );
1255 return NULL;
1256 }
1257
1258 /* Check if we need to grow the block */
1259
1260 pArena = (ARENA_INUSE *)ptr - 1;
1261 pArena->threadId = GetCurrentTask();
1262 subheap = HEAP_FindSubHeap( heapPtr, pArena );
1263 oldSize = (pArena->size & ARENA_SIZE_MASK);
1264 if (size > oldSize)
1265 {
1266 char *pNext = (char *)(pArena + 1) + oldSize;
1267 if ((pNext < (char *)subheap + subheap->size) &&
1268 (*(DWORD *)pNext & ARENA_FLAG_FREE) &&
1269 (oldSize + (*(DWORD *)pNext & ARENA_SIZE_MASK) + sizeof(ARENA_FREE) >= size))
1270 {
1271 /* The next block is free and large enough */
1272 ARENA_FREE *pFree = (ARENA_FREE *)pNext;
1273 pFree->next->prev = pFree->prev;
1274 pFree->prev->next = pFree->next;
1275 pArena->size += (pFree->size & ARENA_SIZE_MASK) + sizeof(*pFree);
1276 if (!HEAP_Commit( subheap, (char *)pArena + sizeof(ARENA_INUSE)
1277 + size + HEAP_MIN_BLOCK_SIZE))
1278 {
1279 if (!(flags & HEAP_NO_SERIALIZE)) LeaveCriticalSection( &heapPtr->critSection );
1280 SetLastError( ERROR_OUTOFMEMORY );
1281 return NULL;
1282 }
1283 HEAP_ShrinkBlock( subheap, pArena, size );
1284 }
1285 else /* Do it the hard way */
1286 {
1287 ARENA_FREE *pNew;
1288 ARENA_INUSE *pInUse;
1289 SUBHEAP *newsubheap;
1290
1291 if ((flags & HEAP_REALLOC_IN_PLACE_ONLY) ||
1292 !(pNew = HEAP_FindFreeBlock( heapPtr, size, &newsubheap )))
1293 {
1294 if (!(flags & HEAP_NO_SERIALIZE)) LeaveCriticalSection( &heapPtr->critSection );
1295 SetLastError( ERROR_OUTOFMEMORY );
1296 return NULL;
1297 }
1298
1299 /* Build the in-use arena */
1300
1301 pNew->next->prev = pNew->prev;
1302 pNew->prev->next = pNew->next;
1303 pInUse = (ARENA_INUSE *)pNew;
1304 pInUse->size = (pInUse->size & ~ARENA_FLAG_FREE)
1305 + sizeof(ARENA_FREE) - sizeof(ARENA_INUSE);
1306 pInUse->threadId = GetCurrentTask();
1307 pInUse->magic = ARENA_INUSE_MAGIC;
1308 HEAP_ShrinkBlock( newsubheap, pInUse, size );
1309 memcpy( pInUse + 1, pArena + 1, oldSize );
1310
1311 /* Free the previous block */
1312
1313 HEAP_MakeInUseBlockFree( subheap, pArena );
1314 subheap = newsubheap;
1315 pArena = pInUse;
1316 }
1317 }
1318 else HEAP_ShrinkBlock( subheap, pArena, size ); /* Shrink the block */
1319
1320 /* Clear the extra bytes if needed */
1321
1322 if (size > oldSize)
1323 {
1324 if (flags & HEAP_ZERO_MEMORY)
1325 memset( (char *)(pArena + 1) + oldSize, 0,
1326 (pArena->size & ARENA_SIZE_MASK) - oldSize );
1327 else if (TRACE_ON(heap))
1328 memset( (char *)(pArena + 1) + oldSize, ARENA_INUSE_FILLER,
1329 (pArena->size & ARENA_SIZE_MASK) - oldSize );
1330 }
1331
1332 /* Return the new arena */
1333
1334 pArena->callerEIP = GET_EIP();
1335 if (!(flags & HEAP_NO_SERIALIZE)) LeaveCriticalSection( &heapPtr->critSection );
1336
1337 TRACE("(%08x,%08lx,%08lx,%08lx): returning %08lx\n",
1338 heap, flags, (DWORD)ptr, size, (DWORD)(pArena + 1) );
1339 return (LPVOID)(pArena + 1);
1340 }
1341
1342
1343 /***********************************************************************
1344 * HeapCompact (KERNEL32.335)
1345 */
1346 DWORD WINAPI HeapCompact( HANDLE heap, DWORD flags )
1347 {
1348 SetLastError(ERROR_CALL_NOT_IMPLEMENTED);
1349 return 0;
1350 }
1351
1352
1353 /***********************************************************************
1354 * HeapLock (KERNEL32.339)
1355 * Attempts to acquire the critical section object for a specified heap.
1356 *
1357 * RETURNS
1358 * TRUE: Success
1359 * FALSE: Failure
1360 */
1361 BOOL WINAPI HeapLock(
1362 HANDLE heap /* [in] Handle of heap to lock for exclusive access */
1363 ) {
1364 HEAP *heapPtr = HEAP_GetPtr( heap );
1365 if (!heapPtr) return FALSE;
1366 EnterCriticalSection( &heapPtr->critSection );
1367 return TRUE;
1368 }
1369
1370
1371 /***********************************************************************
1372 * HeapUnlock (KERNEL32.342)
1373 * Releases ownership of the critical section object.
1374 *
1375 * RETURNS
1376 * TRUE: Success
1377 * FALSE: Failure
1378 */
1379 BOOL WINAPI HeapUnlock(
1380 HANDLE heap /* [in] Handle to the heap to unlock */
1381 ) {
1382 HEAP *heapPtr = HEAP_GetPtr( heap );
1383 if (!heapPtr) return FALSE;
1384 LeaveCriticalSection( &heapPtr->critSection );
1385 return TRUE;
1386 }
1387
1388
1389 /***********************************************************************
1390 * HeapSize (KERNEL32.341)
1391 * RETURNS
1392 * Size in bytes of allocated memory
1393 * 0xffffffff: Failure
1394 */
1395 DWORD WINAPI HeapSize(
1396 HANDLE heap, /* [in] Handle of heap */
1397 DWORD flags, /* [in] Heap size control flags */
1398 LPVOID ptr /* [in] Address of memory to return size for */
1399 ) {
1400 DWORD ret;
1401 HEAP *heapPtr = HEAP_GetPtr( heap );
1402
1403 if (flags & HEAP_WINE_SEGPTR) heapPtr = segptrHeap;
1404 if (!heapPtr) return FALSE;
1405 flags &= HEAP_NO_SERIALIZE;
1406 flags |= heapPtr->flags;
1407 if (!(flags & HEAP_NO_SERIALIZE)) EnterCriticalSection( &heapPtr->critSection );
1408 if (!HEAP_IsRealArena( heapPtr, HEAP_NO_SERIALIZE, ptr, QUIET ))
1409 {
1410 SetLastError( ERROR_INVALID_PARAMETER );
1411 ret = 0xffffffff;
1412 }
1413 else
1414 {
1415 ARENA_INUSE *pArena = (ARENA_INUSE *)ptr - 1;
1416 ret = pArena->size & ARENA_SIZE_MASK;
1417 }
1418 if (!(flags & HEAP_NO_SERIALIZE)) LeaveCriticalSection( &heapPtr->critSection );
1419
1420 TRACE("(%08x,%08lx,%08lx): returning %08lx\n",
1421 heap, flags, (DWORD)ptr, ret );
1422 return ret;
1423 }
1424
1425
1426 /***********************************************************************
1427 * HeapValidate (KERNEL32.343)
1428 * Validates a specified heap.
1429 *
1430 * NOTES
1431 * Flags is ignored.
1432 *
1433 * RETURNS
1434 * TRUE: Success
1435 * FALSE: Failure
1436 */
1437 BOOL WINAPI HeapValidate(
1438 HANDLE heap, /* [in] Handle to the heap */
1439 DWORD flags, /* [in] Bit flags that control access during operation */
1440 LPCVOID block /* [in] Optional pointer to memory block to validate */
1441 ) {
1442 HEAP *heapPtr = HEAP_GetPtr( heap );
1443 if (flags & HEAP_WINE_SEGPTR) heapPtr = segptrHeap;
1444 if (!heapPtr) return FALSE;
1445 return HEAP_IsRealArena( heapPtr, flags, block, QUIET );
1446 }
1447
1448
1449 /***********************************************************************
1450 * HeapWalk (KERNEL32.344)
1451 * Enumerates the memory blocks in a specified heap.
1452 * See HEAP_Dump() for info on heap structure.
1453 *
1454 * TODO
1455 * - handling of PROCESS_HEAP_ENTRY_MOVEABLE and
1456 * PROCESS_HEAP_ENTRY_DDESHARE (needs heap.c support)
1457 *
1458 * RETURNS
1459 * TRUE: Success
1460 * FALSE: Failure
1461 */
1462 BOOL WINAPI HeapWalk(
1463 HANDLE heap, /* [in] Handle to heap to enumerate */
1464 LPPROCESS_HEAP_ENTRY entry /* [out] Pointer to structure of enumeration info */
1465 ) {
1466 HEAP *heapPtr = HEAP_GetPtr(heap);
1467 SUBHEAP *sub, *currentheap = NULL;
1468 BOOL ret = FALSE;
1469 char *ptr;
1470 int region_index = 0;
1471
1472 if (!heapPtr || !entry)
1473 {
1474 SetLastError(ERROR_INVALID_PARAMETER);
1475 return FALSE;
1476 }
1477
1478 if (!(heapPtr->flags & HEAP_NO_SERIALIZE)) EnterCriticalSection( &heapPtr->critSection );
1479
1480 /* set ptr to the next arena to be examined */
1481
1482 if (!entry->lpData) /* first call (init) ? */
1483 {
1484 TRACE("begin walking of heap 0x%08x.\n", heap);
1485 /*HEAP_Dump(heapPtr);*/
1486 currentheap = &heapPtr->subheap;
1487 ptr = (char*)currentheap + currentheap->headerSize;
1488 }
1489 else
1490 {
1491 ptr = entry->lpData;
1492 sub = &heapPtr->subheap;
1493 while (sub)
1494 {
1495 if (((char *)ptr >= (char *)sub) &&
1496 ((char *)ptr < (char *)sub + sub->size))
1497 {
1498 currentheap = sub;
1499 break;
1500 }
1501 sub = sub->next;
1502 region_index++;
1503 }
1504 if (currentheap == NULL)
1505 {
1506 ERR("no matching subheap found, shouldn't happen !\n");
1507 SetLastError(ERROR_NO_MORE_ITEMS);
1508 goto HW_end;
1509 }
1510
1511 ptr += entry->cbData; /* point to next arena */
1512 if (ptr > (char *)currentheap + currentheap->size - 1)
1513 { /* proceed with next subheap */
1514 if (!(currentheap = currentheap->next))
1515 { /* successfully finished */
1516 TRACE("end reached.\n");
1517 SetLastError(ERROR_NO_MORE_ITEMS);
1518 goto HW_end;
1519 }
1520 ptr = (char*)currentheap + currentheap->headerSize;
1521 }
1522 }
1523
1524 entry->wFlags = 0;
1525 if (*(DWORD *)ptr & ARENA_FLAG_FREE)
1526 {
1527 ARENA_FREE *pArena = (ARENA_FREE *)ptr;
1528
1529 /*TRACE("free, magic: %04x\n", pArena->magic);*/
1530
1531 entry->lpData = pArena + 1;
1532 entry->cbData = pArena->size & ARENA_SIZE_MASK;
1533 entry->cbOverhead = sizeof(ARENA_FREE);
1534 entry->wFlags = PROCESS_HEAP_UNCOMMITTED_RANGE;
1535 }
1536 else
1537 {
1538 ARENA_INUSE *pArena = (ARENA_INUSE *)ptr;
1539
1540 /*TRACE("busy, magic: %04x\n", pArena->magic);*/
1541
1542 entry->lpData = pArena + 1;
1543 entry->cbData = pArena->size & ARENA_SIZE_MASK;
1544 entry->cbOverhead = sizeof(ARENA_INUSE);
1545 entry->wFlags = PROCESS_HEAP_ENTRY_BUSY;
1546 /* FIXME: can't handle PROCESS_HEAP_ENTRY_MOVEABLE
1547 and PROCESS_HEAP_ENTRY_DDESHARE yet */
1548 }
1549
1550 entry->iRegionIndex = region_index;
1551
1552 /* first element of heap ? */
1553 if (ptr == (char *)(currentheap + currentheap->headerSize))
1554 {
1555 entry->wFlags |= PROCESS_HEAP_REGION;
1556 entry->u.Region.dwCommittedSize = currentheap->commitSize;
1557 entry->u.Region.dwUnCommittedSize =
1558 currentheap->size - currentheap->commitSize;
1559 entry->u.Region.lpFirstBlock = /* first valid block */
1560 currentheap + currentheap->headerSize;
1561 entry->u.Region.lpLastBlock = /* first invalid block */
1562 currentheap + currentheap->size;
1563 }
1564 ret = TRUE;
1565
1566 HW_end:
1567 if (!(heapPtr->flags & HEAP_NO_SERIALIZE)) LeaveCriticalSection( &heapPtr->critSection );
1568
1569 return ret;
1570 }
1571
1572
1573 /***********************************************************************
1574 * HEAP_CreateSystemHeap
1575 *
1576 * Create the system heap.
1577 */
1578 BOOL HEAP_CreateSystemHeap(void)
1579 {
1580 SYSTEM_HEAP_DESCR *descr;
1581 HANDLE heap;
1582 HEAP *heapPtr;
1583 int created;
1584
1585 HANDLE map = CreateFileMappingA( INVALID_HANDLE_VALUE, NULL, SEC_COMMIT | PAGE_READWRITE,
1586 0, HEAP_DEF_SIZE, "__SystemHeap" );
1587 if (!map) return FALSE;
1588 created = (GetLastError() != ERROR_ALREADY_EXISTS);
1589
1590 if (!(heapPtr = MapViewOfFileEx( map, FILE_MAP_ALL_ACCESS, 0, 0, 0, SYSTEM_HEAP_BASE )))
1591 {
1592 /* pre-defined address not available, use any one */
1593 fprintf( stderr, "Warning: system heap base address %p not available\n",
1594 SYSTEM_HEAP_BASE );
1595 if (!(heapPtr = MapViewOfFile( map, FILE_MAP_ALL_ACCESS, 0, 0, 0 )))
1596 {
1597 CloseHandle( map );
1598 return FALSE;
1599 }
1600 }
1601 heap = (HANDLE)heapPtr;
1602
1603 if (created) /* newly created heap */
1604 {
1605 HEAP_InitSubHeap( heapPtr, heapPtr, HEAP_SHARED, 0, HEAP_DEF_SIZE );
1606 HeapLock( heap );
1607 descr = heapPtr->private = HeapAlloc( heap, HEAP_ZERO_MEMORY, sizeof(*descr) );
1608 assert( descr );
1609 }
1610 else
1611 {
1612 /* wait for the heap to be initialized */
1613 while (!heapPtr->private) Sleep(1);
1614 HeapLock( heap );
1615 /* remap it to the right address if necessary */
1616 if (heapPtr->subheap.heap != heapPtr)
1617 {
1618 void *base = heapPtr->subheap.heap;
1619 HeapUnlock( heap );
1620 UnmapViewOfFile( heapPtr );
1621 if (!(heapPtr = MapViewOfFileEx( map, FILE_MAP_ALL_ACCESS, 0, 0, 0, base )))
1622 {
1623 fprintf( stderr, "Couldn't map system heap at the correct address (%p)\n", base );
1624 CloseHandle( map );
1625 return FALSE;
1626 }
1627 heap = (HANDLE)heapPtr;
1628 HeapLock( heap );
1629 }
1630 descr = heapPtr->private;
1631 assert( descr );
1632 }
1633 SystemHeap = heap;
1634 SystemHeapDescr = descr;
1635 HeapUnlock( heap );
1636 CloseHandle( map );
1637 return TRUE;
1638 }
1639
1640
1641 /***********************************************************************
1642 * GetProcessHeap (KERNEL32.259)
1643 */
1644 HANDLE WINAPI GetProcessHeap(void)
1645 {
1646 return (HANDLE)processHeap;
1647 }
1648
1649
1650 /***********************************************************************
1651 * GetProcessHeaps (KERNEL32.376)
1652 */
1653 DWORD WINAPI GetProcessHeaps( DWORD count, HANDLE *heaps )
1654 {
1655 DWORD total;
1656 HEAP *ptr;
1657
1658 if (!processHeap) return 0; /* should never happen */
1659 total = 1; /* main heap */
1660 EnterCriticalSection( &processHeap->critSection );
1661 for (ptr = firstHeap; ptr; ptr = ptr->next) total++;
1662 if (total <= count)
1663 {
1664 *heaps++ = (HANDLE)processHeap;
1665 for (ptr = firstHeap; ptr; ptr = ptr->next) *heaps++ = (HANDLE)ptr;
1666 }
1667 LeaveCriticalSection( &processHeap->critSection );
1668 return total;
1669 }
1670
1671
1672 /***********************************************************************
1673 * 32-bit local heap functions (Win95; undocumented)
1674 */
1675
1676 #define HTABLE_SIZE 0x10000
1677 #define HTABLE_PAGESIZE 0x1000
1678 #define HTABLE_NPAGES (HTABLE_SIZE / HTABLE_PAGESIZE)
1679
1680 #include "pshpack1.h"
1681 typedef struct _LOCAL32HEADER
1682 {
1683 WORD freeListFirst[HTABLE_NPAGES];
1684 WORD freeListSize[HTABLE_NPAGES];
1685 WORD freeListLast[HTABLE_NPAGES];
1686
1687 DWORD selectorTableOffset;
1688 WORD selectorTableSize;
1689 WORD selectorDelta;
1690
1691 DWORD segment;
1692 LPBYTE base;
1693
1694 DWORD limit;
1695 DWORD flags;
1696
1697 DWORD magic;
1698 HANDLE heap;
1699
1700 } LOCAL32HEADER;
1701 #include "poppack.h"
1702
1703 #define LOCAL32_MAGIC ((DWORD)('L' | ('H'<<8) | ('3'<<16) | ('2'<<24)))
1704
1705 /***********************************************************************
1706 * Local32Init (KERNEL.208)
1707 */
1708 HANDLE WINAPI Local32Init16( WORD segment, DWORD tableSize,
1709 DWORD heapSize, DWORD flags )
1710 {
1711 DWORD totSize, segSize = 0;
1712 LPBYTE base;
1713 LOCAL32HEADER *header;
1714 HEAP *heap;
1715 WORD *selectorTable;
1716 WORD selectorEven, selectorOdd;
1717 int i, nrBlocks;
1718
1719 /* Determine new heap size */
1720
1721 if ( segment )
1722 {
1723 if ( (segSize = GetSelectorLimit16( segment )) == 0 )
1724 return 0;
1725 else
1726 segSize++;
1727 }
1728
1729 if ( heapSize == -1L )
1730 heapSize = 1024L*1024L; /* FIXME */
1731
1732 heapSize = (heapSize + 0xffff) & 0xffff0000;
1733 segSize = (segSize + 0x0fff) & 0xfffff000;
1734 totSize = segSize + HTABLE_SIZE + heapSize;
1735
1736
1737 /* Allocate memory and initialize heap */
1738
1739 if ( !(base = VirtualAlloc( NULL, totSize, MEM_RESERVE, PAGE_READWRITE )) )
1740 return 0;
1741
1742 if ( !VirtualAlloc( base, segSize + HTABLE_PAGESIZE,
1743 MEM_COMMIT, PAGE_READWRITE ) )
1744 {
1745 VirtualFree( base, 0, MEM_RELEASE );
1746 return 0;
1747 }
1748
1749 heap = (HEAP *)(base + segSize + HTABLE_SIZE);
1750 if ( !HEAP_InitSubHeap( heap, (LPVOID)heap, 0, 0x10000, heapSize ) )
1751 {
1752 VirtualFree( base, 0, MEM_RELEASE );
1753 return 0;
1754 }
1755
1756
1757 /* Set up header and handle table */
1758
1759 header = (LOCAL32HEADER *)(base + segSize);
1760 header->base = base;
1761 header->limit = HTABLE_PAGESIZE-1;
1762 header->flags = 0;
1763 header->magic = LOCAL32_MAGIC;
1764 header->heap = (HANDLE)heap;
1765
1766 header->freeListFirst[0] = sizeof(LOCAL32HEADER);
1767 header->freeListLast[0] = HTABLE_PAGESIZE - 4;
1768 header->freeListSize[0] = (HTABLE_PAGESIZE - sizeof(LOCAL32HEADER)) / 4;
1769
1770 for (i = header->freeListFirst[0]; i < header->freeListLast[0]; i += 4)
1771 *(DWORD *)((LPBYTE)header + i) = i+4;
1772
1773 header->freeListFirst[1] = 0xffff;
1774
1775
1776 /* Set up selector table */
1777
1778 nrBlocks = (totSize + 0x7fff) >> 15;
1779 selectorTable = (LPWORD) HeapAlloc( header->heap, 0, nrBlocks * 2 );
1780 selectorEven = SELECTOR_AllocBlock( base, totSize, WINE_LDT_FLAGS_DATA );
1781 selectorOdd = SELECTOR_AllocBlock( base + 0x8000, totSize - 0x8000, WINE_LDT_FLAGS_DATA );
1782 if ( !selectorTable || !selectorEven || !selectorOdd )
1783 {
1784 if ( selectorTable ) HeapFree( header->heap, 0, selectorTable );
1785 if ( selectorEven ) SELECTOR_FreeBlock( selectorEven );
1786 if ( selectorOdd ) SELECTOR_FreeBlock( selectorOdd );
1787 HeapDestroy( header->heap );
1788 VirtualFree( base, 0, MEM_RELEASE );
1789 return 0;
1790 }
1791
1792 header->selectorTableOffset = (LPBYTE)selectorTable - header->base;
1793 header->selectorTableSize = nrBlocks * 4; /* ??? Win95 does it this way! */
1794 header->selectorDelta = selectorEven - selectorOdd;
1795 header->segment = segment? segment : selectorEven;
1796
1797 for (i = 0; i < nrBlocks; i++)
1798 selectorTable[i] = (i & 1)? selectorOdd + ((i >> 1) << __AHSHIFT)
1799 : selectorEven + ((i >> 1) << __AHSHIFT);
1800
1801 /* Move old segment */
1802
1803 if ( segment )
1804 {
1805 /* FIXME: This is somewhat ugly and relies on implementation
1806 details about 16-bit global memory handles ... */
1807
1808 LPBYTE oldBase = (LPBYTE)GetSelectorBase( segment );
1809 memcpy( base, oldBase, segSize );
1810 GLOBAL_MoveBlock( segment, base, totSize );
1811 HeapFree( SystemHeap, 0, oldBase );
1812 }
1813
1814 return (HANDLE)header;
1815 }
1816
1817 /***********************************************************************
1818 * Local32_SearchHandle
1819 */
1820 static LPDWORD Local32_SearchHandle( LOCAL32HEADER *header, DWORD addr )
1821 {
1822 LPDWORD handle;
1823
1824 for ( handle = (LPDWORD)((LPBYTE)header + sizeof(LOCAL32HEADER));
1825 handle < (LPDWORD)((LPBYTE)header + header->limit);
1826 handle++)
1827 {
1828 if (*handle == addr)
1829 return handle;
1830 }
1831
1832 return NULL;
1833 }
1834
1835 /***********************************************************************
1836 * Local32_ToHandle
1837 */
1838 static VOID Local32_ToHandle( LOCAL32HEADER *header, INT16 type,
1839 DWORD addr, LPDWORD *handle, LPBYTE *ptr )
1840 {
1841 *handle = NULL;
1842 *ptr = NULL;
1843
1844 switch (type)
1845 {
1846 case -2: /* 16:16 pointer, no handles */
1847 *ptr = MapSL( addr );
1848 *handle = (LPDWORD)*ptr;
1849 break;
1850
1851 case -1: /* 32-bit offset, no handles */
1852 *ptr = header->base + addr;
1853 *handle = (LPDWORD)*ptr;
1854 break;
1855
1856 case 0: /* handle */
1857 if ( addr >= sizeof(LOCAL32HEADER)
1858 && addr < header->limit && !(addr & 3)
1859 && *(LPDWORD)((LPBYTE)header + addr) >= HTABLE_SIZE )
1860 {
1861 *handle = (LPDWORD)((LPBYTE)header + addr);
1862 *ptr = header->base + **handle;
1863 }
1864 break;
1865
1866 case 1: /* 16:16 pointer */
1867 *ptr = MapSL( addr );
1868 *handle = Local32_SearchHandle( header, *ptr - header->base );
1869 break;
1870
1871 case 2: /* 32-bit offset */
1872 *ptr = header->base + addr;
1873 *handle = Local32_SearchHandle( header, *ptr - header->base );
1874 break;
1875 }
1876 }
1877
1878 /***********************************************************************
1879 * Local32_FromHandle
1880 */
1881 static VOID Local32_FromHandle( LOCAL32HEADER *header, INT16 type,
1882 DWORD *addr, LPDWORD handle, LPBYTE ptr )
1883 {
1884 switch (type)
1885 {
1886 case -2: /* 16:16 pointer */
1887 case 1:
1888 {
1889 WORD *selTable = (LPWORD)(header->base + header->selectorTableOffset);
1890 DWORD offset = (LPBYTE)ptr - header->base;
1891 *addr = MAKELONG( offset & 0x7fff, selTable[offset >> 15] );
1892 }
1893 break;
1894
1895 case -1: /* 32-bit offset */
1896 case 2:
1897 *addr = ptr - header->base;
1898 break;
1899
1900 case 0: /* handle */
1901 *addr = (LPBYTE)handle - (LPBYTE)header;
1902 break;
1903 }
1904 }
1905
1906 /***********************************************************************
1907 * Local32Alloc (KERNEL.209)
1908 */
1909 DWORD WINAPI Local32Alloc16( HANDLE heap, DWORD size, INT16 type, DWORD flags )
1910 {
1911 LOCAL32HEADER *header = (LOCAL32HEADER *)heap;
1912 LPDWORD handle;
1913 LPBYTE ptr;
1914 DWORD addr;
1915
1916 /* Allocate memory */
1917 ptr = HeapAlloc( header->heap,
1918 (flags & LMEM_MOVEABLE)? HEAP_ZERO_MEMORY : 0, size );
1919 if (!ptr) return 0;
1920
1921
1922 /* Allocate handle if requested */
1923 if (type >= 0)
1924 {
1925 int page, i;
1926
1927 /* Find first page of handle table with free slots */
1928 for (page = 0; page < HTABLE_NPAGES; page++)
1929 if (header->freeListFirst[page] != 0)
1930 break;
1931 if (page == HTABLE_NPAGES)
1932 {
1933 WARN("Out of handles!\n" );
1934 HeapFree( header->heap, 0, ptr );
1935 return 0;
1936 }
1937
1938 /* If virgin page, initialize it */
1939 if (header->freeListFirst[page] == 0xffff)
1940 {
1941 if ( !VirtualAlloc( (LPBYTE)header + (page << 12),
1942 0x1000, MEM_COMMIT, PAGE_READWRITE ) )
1943 {
1944 WARN("Cannot grow handle table!\n" );
1945 HeapFree( header->heap, 0, ptr );
1946 return 0;
1947 }
1948
1949 header->limit += HTABLE_PAGESIZE;
1950
1951 header->freeListFirst[page] = 0;
1952 header->freeListLast[page] = HTABLE_PAGESIZE - 4;
1953 header->freeListSize[page] = HTABLE_PAGESIZE / 4;
1954
1955 for (i = 0; i < HTABLE_PAGESIZE; i += 4)
1956 *(DWORD *)((LPBYTE)header + i) = i+4;
1957
1958 if (page < HTABLE_NPAGES-1)
1959 header->freeListFirst[page+1] = 0xffff;
1960 }
1961
1962 /* Allocate handle slot from page */
1963 handle = (LPDWORD)((LPBYTE)header + header->freeListFirst[page]);
1964 if (--header->freeListSize[page] == 0)
1965 header->freeListFirst[page] = header->freeListLast[page] = 0;
1966 else
1967 header->freeListFirst[page] = *handle;
1968
1969 /* Store 32-bit offset in handle slot */
1970 *handle = ptr - header->base;
1971 }
1972 else
1973 {
1974 handle = (LPDWORD)ptr;
1975 header->flags |= 1;
1976 }
1977
1978
1979 /* Convert handle to requested output type */
1980 Local32_FromHandle( header, type, &addr, handle, ptr );
1981 return addr;
1982 }
1983
1984 /***********************************************************************
1985 * Local32ReAlloc (KERNEL.210)
1986 */
1987 DWORD WINAPI Local32ReAlloc16( HANDLE heap, DWORD addr, INT16 type,
1988 DWORD size, DWORD flags )
1989 {
1990 LOCAL32HEADER *header = (LOCAL32HEADER *)heap;
1991 LPDWORD handle;
1992 LPBYTE ptr;
1993
1994 if (!addr)
1995 return Local32Alloc16( heap, size, type, flags );
1996
1997 /* Retrieve handle and pointer */
1998 Local32_ToHandle( header, type, addr, &handle, &ptr );
1999 if (!handle) return FALSE;
2000
2001 /* Reallocate memory block */
2002 ptr = HeapReAlloc( header->heap,
2003 (flags & LMEM_MOVEABLE)? HEAP_ZERO_MEMORY : 0,
2004 ptr, size );
2005 if (!ptr) return 0;
2006
2007 /* Modify handle */
2008 if (type >= 0)
2009 *handle = ptr - header->base;
2010 else
2011 handle = (LPDWORD)ptr;
2012
2013 /* Convert handle to requested output type */
2014 Local32_FromHandle( header, type, &addr, handle, ptr );
2015 return addr;
2016 }
2017
2018 /***********************************************************************
2019 * Local32Free (KERNEL.211)
2020 */
2021 BOOL WINAPI Local32Free16( HANDLE heap, DWORD addr, INT16 type )
2022 {
2023 LOCAL32HEADER *header = (LOCAL32HEADER *)heap;
2024 LPDWORD handle;
2025 LPBYTE ptr;
2026
2027 /* Retrieve handle and pointer */
2028 Local32_ToHandle( header, type, addr, &handle, &ptr );
2029 if (!handle) return FALSE;
2030
2031 /* Free handle if necessary */
2032 if (type >= 0)
2033 {
2034 int offset = (LPBYTE)handle - (LPBYTE)header;
2035 int page = offset >> 12;
2036
2037 /* Return handle slot to page free list */
2038 if (header->freeListSize[page]++ == 0)
2039 header->freeListFirst[page] = header->freeListLast[page] = offset;
2040 else
2041 *(LPDWORD)((LPBYTE)header + header->freeListLast[page]) = offset,
2042 header->freeListLast[page] = offset;
2043
2044 *handle = 0;
2045
2046 /* Shrink handle table when possible */
2047 while (page > 0 && header->freeListSize[page] == HTABLE_PAGESIZE / 4)
2048 {
2049 if ( VirtualFree( (LPBYTE)header +
2050 (header->limit & ~(HTABLE_PAGESIZE-1)),
2051 HTABLE_PAGESIZE, MEM_DECOMMIT ) )
2052 break;
2053
2054 header->limit -= HTABLE_PAGESIZE;
2055 header->freeListFirst[page] = 0xffff;
2056 page--;
2057 }
2058 }
2059
2060 /* Free memory */
2061 return HeapFree( header->heap, 0, ptr );
2062 }
2063
2064 /***********************************************************************
2065 * Local32Translate (KERNEL.213)
2066 */
2067 DWORD WINAPI Local32Translate16( HANDLE heap, DWORD addr, INT16 type1, INT16 type2 )
2068 {
2069 LOCAL32HEADER *header = (LOCAL32HEADER *)heap;
2070 LPDWORD handle;
2071 LPBYTE ptr;
2072
2073 Local32_ToHandle( header, type1, addr, &handle, &ptr );
2074 if (!handle) return 0;
2075
2076 Local32_FromHandle( header, type2, &addr, handle, ptr );
2077 return addr;
2078 }
2079
2080 /***********************************************************************
2081 * Local32Size (KERNEL.214)
2082 */
2083 DWORD WINAPI Local32Size16( HANDLE heap, DWORD addr, INT16 type )
2084 {
2085 LOCAL32HEADER *header = (LOCAL32HEADER *)heap;
2086 LPDWORD handle;
2087 LPBYTE ptr;
2088
2089 Local32_ToHandle( header, type, addr, &handle, &ptr );
2090 if (!handle) return 0;
2091
2092 return HeapSize( header->heap, 0, ptr );
2093 }
2094
2095 /***********************************************************************
2096 * Local32ValidHandle (KERNEL.215)
2097 */
2098 BOOL WINAPI Local32ValidHandle16( HANDLE heap, WORD addr )
2099 {
2100 LOCAL32HEADER *header = (LOCAL32HEADER *)heap;
2101 LPDWORD handle;
2102 LPBYTE ptr;
2103
2104 Local32_ToHandle( header, 0, addr, &handle, &ptr );
2105 return handle != NULL;
2106 }
2107
2108 /***********************************************************************
2109 * Local32GetSegment (KERNEL.229)
2110 */
2111 WORD WINAPI Local32GetSegment16( HANDLE heap )
2112 {
2113 LOCAL32HEADER *header = (LOCAL32HEADER *)heap;
2114 return header->segment;
2115 }
2116
2117 /***********************************************************************
2118 * Local32_GetHeap
2119 */
2120 static LOCAL32HEADER *Local32_GetHeap( HGLOBAL16 handle )
2121 {
2122 WORD selector = GlobalHandleToSel16( handle );
2123 DWORD base = GetSelectorBase( selector );
2124 DWORD limit = GetSelectorLimit16( selector );
2125
2126 /* Hmmm. This is a somewhat stupid heuristic, but Windows 95 does
2127 it this way ... */
2128
2129 if ( limit > 0x10000 && ((LOCAL32HEADER *)base)->magic == LOCAL32_MAGIC )
2130 return (LOCAL32HEADER *)base;
2131
2132 base += 0x10000;
2133 limit -= 0x10000;
2134
2135 if ( limit > 0x10000 && ((LOCAL32HEADER *)base)->magic == LOCAL32_MAGIC )
2136 return (LOCAL32HEADER *)base;
2137
2138 return NULL;
2139 }
2140
2141 /***********************************************************************
2142 * Local32Info (KERNEL.444) (TOOLHELP.84)
2143 */
2144 BOOL16 WINAPI Local32Info16( LOCAL32INFO *pLocal32Info, HGLOBAL16 handle )
2145 {
2146 SUBHEAP *heapPtr;
2147 LPBYTE ptr;
2148 int i;
2149
2150 LOCAL32HEADER *header = Local32_GetHeap( handle );
2151 if ( !header ) return FALSE;
2152
2153 if ( !pLocal32Info || pLocal32Info->dwSize < sizeof(LOCAL32INFO) )
2154 return FALSE;
2155
2156 heapPtr = (SUBHEAP *)HEAP_GetPtr( header->heap );
2157 pLocal32Info->dwMemReserved = heapPtr->size;
2158 pLocal32Info->dwMemCommitted = heapPtr->commitSize;
2159 pLocal32Info->dwTotalFree = 0L;
2160 pLocal32Info->dwLargestFreeBlock = 0L;
2161
2162 /* Note: Local32 heaps always have only one subheap! */
2163 ptr = (LPBYTE)heapPtr + heapPtr->headerSize;
2164 while ( ptr < (LPBYTE)heapPtr + heapPtr->size )
2165 {
2166 if (*(DWORD *)ptr & ARENA_FLAG_FREE)
2167 {
2168 ARENA_FREE *pArena = (ARENA_FREE *)ptr;
2169 DWORD size = (pArena->size & ARENA_SIZE_MASK);
2170 ptr += sizeof(*pArena) + size;
2171
2172 pLocal32Info->dwTotalFree += size;
2173 if ( size > pLocal32Info->dwLargestFreeBlock )
2174 pLocal32Info->dwLargestFreeBlock = size;
2175 }
2176 else
2177 {
2178 ARENA_INUSE *pArena = (ARENA_INUSE *)ptr;
2179 DWORD size = (pArena->size & ARENA_SIZE_MASK);
2180 ptr += sizeof(*pArena) + size;
2181 }
2182 }
2183
2184 pLocal32Info->dwcFreeHandles = 0;
2185 for ( i = 0; i < HTABLE_NPAGES; i++ )
2186 {
2187 if ( header->freeListFirst[i] == 0xffff ) break;
2188 pLocal32Info->dwcFreeHandles += header->freeListSize[i];
2189 }
2190 pLocal32Info->dwcFreeHandles += (HTABLE_NPAGES - i) * HTABLE_PAGESIZE/4;
2191
2192 return TRUE;
2193 }
2194
2195 /***********************************************************************
2196 * Local32First (KERNEL.445) (TOOLHELP.85)
2197 */
2198 BOOL16 WINAPI Local32First16( LOCAL32ENTRY *pLocal32Entry, HGLOBAL16 handle )
2199 {
2200 FIXME("(%p, %04X): stub!\n", pLocal32Entry, handle );
2201 return FALSE;
2202 }
2203
2204 /***********************************************************************
2205 * Local32Next (KERNEL.446) (TOOLHELP.86)
2206 */
2207 BOOL16 WINAPI Local32Next16( LOCAL32ENTRY *pLocal32Entry )
2208 {
2209 FIXME("(%p): stub!\n", pLocal32Entry );
2210 return FALSE;
2211 }
2212
Windows API implementation