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explorer: Avoid crashing when the desktop launchers are not initialized.
[wine.git] / dlls / ntdll / heap.c
blobac78889ed519ad12602652a9bc4c4c2b802a50d1
1 /*
2 * Win32 heap functions
3 *
4 * Copyright 1996 Alexandre Julliard
5 * Copyright 1998 Ulrich Weigand
6 *
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with this library; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
20 */
21
22 #include "config.h"
23 #include "wine/port.h"
24
25 #include <assert.h>
26 #include <stdlib.h>
27 #include <stdarg.h>
28 #include <stdio.h>
29 #include <string.h>
30 #ifdef HAVE_VALGRIND_MEMCHECK_H
31 #include <valgrind/memcheck.h>
32 #else
33 #define RUNNING_ON_VALGRIND 0
34 #endif
35
36 #define NONAMELESSUNION
37 #define NONAMELESSSTRUCT
38 #include "ntstatus.h"
39 #define WIN32_NO_STATUS
40 #include "windef.h"
41 #include "winnt.h"
42 #include "winternl.h"
43 #include "ntdll_misc.h"
44 #include "wine/list.h"
45 #include "wine/debug.h"
46 #include "wine/server.h"
47
48 WINE_DEFAULT_DEBUG_CHANNEL(heap);
49
50 /* Note: the heap data structures are loosely based on what Pietrek describes in his
51 * book 'Windows 95 System Programming Secrets', with some adaptations for
52 * better compatibility with NT.
53 */
54
55 typedef struct tagARENA_INUSE
56 {
57 DWORD size; /* Block size; must be the first field */
58 DWORD magic : 24; /* Magic number */
59 DWORD unused_bytes : 8; /* Number of bytes in the block not used by user data (max value is HEAP_MIN_DATA_SIZE+HEAP_MIN_SHRINK_SIZE) */
60 } ARENA_INUSE;
61
62 typedef struct tagARENA_FREE
63 {
64 DWORD size; /* Block size; must be the first field */
65 DWORD magic; /* Magic number */
66 struct list entry; /* Entry in free list */
67 } ARENA_FREE;
68
69 typedef struct
70 {
71 struct list entry; /* entry in heap large blocks list */
72 SIZE_T data_size; /* size of user data */
73 SIZE_T block_size; /* total size of virtual memory block */
74 DWORD pad[2]; /* padding to ensure 16-byte alignment of data */
75 DWORD size; /* fields for compatibility with normal arenas */
76 DWORD magic; /* these must remain at the end of the structure */
77 } ARENA_LARGE;
78
79 #define ARENA_FLAG_FREE 0x00000001 /* flags OR'ed with arena size */
80 #define ARENA_FLAG_PREV_FREE 0x00000002
81 #define ARENA_SIZE_MASK (~3)
82 #define ARENA_LARGE_SIZE 0xfedcba90 /* magic value for 'size' field in large blocks */
83
84 /* Value for arena 'magic' field */
85 #define ARENA_INUSE_MAGIC 0x455355
86 #define ARENA_PENDING_MAGIC 0xbedead
87 #define ARENA_FREE_MAGIC 0x45455246
88 #define ARENA_LARGE_MAGIC 0x6752614c
89
90 #define ARENA_INUSE_FILLER 0x55
91 #define ARENA_TAIL_FILLER 0xab
92 #define ARENA_FREE_FILLER 0xfeeefeee
93
94 /* everything is aligned on 8 byte boundaries (16 for Win64) */
95 #define ALIGNMENT (2*sizeof(void*))
96 #define LARGE_ALIGNMENT 16 /* large blocks have stricter alignment */
97 #define ARENA_OFFSET (ALIGNMENT - sizeof(ARENA_INUSE))
98
99 C_ASSERT( sizeof(ARENA_LARGE) % LARGE_ALIGNMENT == 0 );
100
101 #define ROUND_SIZE(size) ((((size) + ALIGNMENT - 1) & ~(ALIGNMENT-1)) + ARENA_OFFSET)
102
103 #define QUIET 1 /* Suppress messages */
104 #define NOISY 0 /* Report all errors */
105
106 /* minimum data size (without arenas) of an allocated block */
107 /* make sure that it's larger than a free list entry */
108 #define HEAP_MIN_DATA_SIZE ROUND_SIZE(2 * sizeof(struct list))
109 /* minimum size that must remain to shrink an allocated block */
110 #define HEAP_MIN_SHRINK_SIZE (HEAP_MIN_DATA_SIZE+sizeof(ARENA_FREE))
111 /* minimum size to start allocating large blocks */
112 #define HEAP_MIN_LARGE_BLOCK_SIZE 0x7f000
113 /* extra size to add at the end of block for tail checking */
114 #define HEAP_TAIL_EXTRA_SIZE(flags) \
115 ((flags & HEAP_TAIL_CHECKING_ENABLED) || RUNNING_ON_VALGRIND ? ALIGNMENT : 0)
116
117 /* Max size of the blocks on the free lists */
118 static const SIZE_T HEAP_freeListSizes[] =
119 {
120 0x10, 0x20, 0x30, 0x40, 0x60, 0x80, 0x100, 0x200, 0x400, 0x1000, ~0UL
121 };
122 #define HEAP_NB_FREE_LISTS (sizeof(HEAP_freeListSizes)/sizeof(HEAP_freeListSizes[0]))
123
124 typedef union
125 {
126 ARENA_FREE arena;
127 void *alignment[4];
128 } FREE_LIST_ENTRY;
129
130 struct tagHEAP;
131
132 typedef struct tagSUBHEAP
133 {
134 void *base; /* Base address of the sub-heap memory block */
135 SIZE_T size; /* Size of the whole sub-heap */
136 SIZE_T min_commit; /* Minimum committed size */
137 SIZE_T commitSize; /* Committed size of the sub-heap */
138 struct list entry; /* Entry in sub-heap list */
139 struct tagHEAP *heap; /* Main heap structure */
140 DWORD headerSize; /* Size of the heap header */
141 DWORD magic; /* Magic number */
142 } SUBHEAP;
143
144 #define SUBHEAP_MAGIC ((DWORD)('S' | ('U'<<8) | ('B'<<16) | ('H'<<24)))
145
146 typedef struct tagHEAP
147 {
148 DWORD_PTR unknown1[2];
149 DWORD unknown2;
150 DWORD flags; /* Heap flags */
151 DWORD force_flags; /* Forced heap flags for debugging */
152 SUBHEAP subheap; /* First sub-heap */
153 struct list entry; /* Entry in process heap list */
154 struct list subheap_list; /* Sub-heap list */
155 struct list large_list; /* Large blocks list */
156 SIZE_T grow_size; /* Size of next subheap for growing heap */
157 DWORD magic; /* Magic number */
158 DWORD pending_pos; /* Position in pending free requests ring */
159 ARENA_INUSE **pending_free; /* Ring buffer for pending free requests */
160 RTL_CRITICAL_SECTION critSection; /* Critical section for serialization */
161 FREE_LIST_ENTRY *freeList; /* Free lists */
162 } HEAP;
163
164 #define HEAP_MAGIC ((DWORD)('H' | ('E'<<8) | ('A'<<16) | ('P'<<24)))
165
166 #define HEAP_DEF_SIZE 0x110000 /* Default heap size = 1Mb + 64Kb */
167 #define COMMIT_MASK 0xffff /* bitmask for commit/decommit granularity */
168 #define MAX_FREE_PENDING 1024 /* max number of free requests to delay */
169
170 /* some undocumented flags (names are made up) */
171 #define HEAP_PAGE_ALLOCS 0x01000000
172 #define HEAP_VALIDATE 0x10000000
173 #define HEAP_VALIDATE_ALL 0x20000000
174 #define HEAP_VALIDATE_PARAMS 0x40000000
175
176 static HEAP *processHeap; /* main process heap */
177
178 static BOOL HEAP_IsRealArena( HEAP *heapPtr, DWORD flags, LPCVOID block, BOOL quiet );
179
180 /* mark a block of memory as free for debugging purposes */
181 static inline void mark_block_free( void *ptr, SIZE_T size, DWORD flags )
182 {
183 if (flags & HEAP_FREE_CHECKING_ENABLED)
184 {
185 SIZE_T i;
186 for (i = 0; i < size / sizeof(DWORD); i++) ((DWORD *)ptr)[i] = ARENA_FREE_FILLER;
187 }
188 #if defined(VALGRIND_MAKE_MEM_NOACCESS)
189 VALGRIND_DISCARD( VALGRIND_MAKE_MEM_NOACCESS( ptr, size ));
190 #elif defined( VALGRIND_MAKE_NOACCESS)
191 VALGRIND_DISCARD( VALGRIND_MAKE_NOACCESS( ptr, size ));
192 #endif
193 }
194
195 /* mark a block of memory as initialized for debugging purposes */
196 static inline void mark_block_initialized( void *ptr, SIZE_T size )
197 {
198 #if defined(VALGRIND_MAKE_MEM_DEFINED)
199 VALGRIND_DISCARD( VALGRIND_MAKE_MEM_DEFINED( ptr, size ));
200 #elif defined(VALGRIND_MAKE_READABLE)
201 VALGRIND_DISCARD( VALGRIND_MAKE_READABLE( ptr, size ));
202 #endif
203 }
204
205 /* mark a block of memory as uninitialized for debugging purposes */
206 static inline void mark_block_uninitialized( void *ptr, SIZE_T size )
207 {
208 #if defined(VALGRIND_MAKE_MEM_UNDEFINED)
209 VALGRIND_DISCARD( VALGRIND_MAKE_MEM_UNDEFINED( ptr, size ));
210 #elif defined(VALGRIND_MAKE_WRITABLE)
211 VALGRIND_DISCARD( VALGRIND_MAKE_WRITABLE( ptr, size ));
212 #endif
213 }
214
215 /* mark a block of memory as a tail block */
216 static inline void mark_block_tail( void *ptr, SIZE_T size, DWORD flags )
217 {
218 if (flags & HEAP_TAIL_CHECKING_ENABLED)
219 {
220 mark_block_uninitialized( ptr, size );
221 memset( ptr, ARENA_TAIL_FILLER, size );
222 }
223 #if defined(VALGRIND_MAKE_MEM_NOACCESS)
224 VALGRIND_DISCARD( VALGRIND_MAKE_MEM_NOACCESS( ptr, size ));
225 #elif defined( VALGRIND_MAKE_NOACCESS)
226 VALGRIND_DISCARD( VALGRIND_MAKE_NOACCESS( ptr, size ));
227 #endif
228 }
229
230 /* initialize contents of a newly created block of memory */
231 static inline void initialize_block( void *ptr, SIZE_T size, SIZE_T unused, DWORD flags )
232 {
233 if (flags & HEAP_ZERO_MEMORY)
234 {
235 mark_block_initialized( ptr, size );
236 memset( ptr, 0, size );
237 }
238 else
239 {
240 mark_block_uninitialized( ptr, size );
241 if (flags & HEAP_FREE_CHECKING_ENABLED)
242 {
243 memset( ptr, ARENA_INUSE_FILLER, size );
244 mark_block_uninitialized( ptr, size );
245 }
246 }
247
248 mark_block_tail( (char *)ptr + size, unused, flags );
249 }
250
251 /* notify that a new block of memory has been allocated for debugging purposes */
252 static inline void notify_alloc( void *ptr, SIZE_T size, BOOL init )
253 {
254 #ifdef VALGRIND_MALLOCLIKE_BLOCK
255 VALGRIND_MALLOCLIKE_BLOCK( ptr, size, 0, init );
256 #endif
257 }
258
259 /* notify that a block of memory has been freed for debugging purposes */
260 static inline void notify_free( void const *ptr )
261 {
262 #ifdef VALGRIND_FREELIKE_BLOCK
263 VALGRIND_FREELIKE_BLOCK( ptr, 0 );
264 #endif
265 }
266
267 static inline void notify_realloc( void const *ptr, SIZE_T size_old, SIZE_T size_new )
268 {
269 #ifdef VALGRIND_RESIZEINPLACE_BLOCK
270 VALGRIND_RESIZEINPLACE_BLOCK( ptr, size_old, size_new, 0 );
271 #endif
272 }
273
274 static void subheap_notify_free_all(SUBHEAP const *subheap)
275 {
276 #ifdef VALGRIND_FREELIKE_BLOCK
277 char const *ptr = (char const *)subheap->base + subheap->headerSize;
278
279 if (!RUNNING_ON_VALGRIND) return;
280
281 while (ptr < (char const *)subheap->base + subheap->size)
282 {
283 if (*(const DWORD *)ptr & ARENA_FLAG_FREE)
284 {
285 ARENA_FREE const *pArena = (ARENA_FREE const *)ptr;
286 if (pArena->magic!=ARENA_FREE_MAGIC) ERR("bad free_magic @%p\n", pArena);
287 ptr += sizeof(*pArena) + (pArena->size & ARENA_SIZE_MASK);
288 }
289 else
290 {
291 ARENA_INUSE const *pArena = (ARENA_INUSE const *)ptr;
292 if (pArena->magic == ARENA_INUSE_MAGIC) notify_free(pArena + 1);
293 else if (pArena->magic != ARENA_PENDING_MAGIC) ERR("bad inuse_magic @%p\n", pArena);
294 ptr += sizeof(*pArena) + (pArena->size & ARENA_SIZE_MASK);
295 }
296 }
297 #endif
298 }
299
300 /* locate a free list entry of the appropriate size */
301 /* size is the size of the whole block including the arena header */
302 static inline unsigned int get_freelist_index( SIZE_T size )
303 {
304 unsigned int i;
305
306 size -= sizeof(ARENA_FREE);
307 for (i = 0; i < HEAP_NB_FREE_LISTS - 1; i++) if (size <= HEAP_freeListSizes[i]) break;
308 return i;
309 }
310
311 /* get the memory protection type to use for a given heap */
312 static inline ULONG get_protection_type( DWORD flags )
313 {
314 return (flags & HEAP_CREATE_ENABLE_EXECUTE) ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
315 }
316
317 static RTL_CRITICAL_SECTION_DEBUG process_heap_critsect_debug =
318 {
319 0, 0, NULL, /* will be set later */
320 { &process_heap_critsect_debug.ProcessLocksList, &process_heap_critsect_debug.ProcessLocksList },
321 0, 0, { (DWORD_PTR)(__FILE__ ": main process heap section") }
322 };
323
324
325 /***********************************************************************
326 * HEAP_Dump
327 */
328 static void HEAP_Dump( HEAP *heap )
329 {
330 unsigned int i;
331 SUBHEAP *subheap;
332 char *ptr;
333
334 DPRINTF( "Heap: %p\n", heap );
335 DPRINTF( "Next: %p Sub-heaps:", LIST_ENTRY( heap->entry.next, HEAP, entry ) );
336 LIST_FOR_EACH_ENTRY( subheap, &heap->subheap_list, SUBHEAP, entry ) DPRINTF( " %p", subheap );
337
338 DPRINTF( "\nFree lists:\n Block Stat Size Id\n" );
339 for (i = 0; i < HEAP_NB_FREE_LISTS; i++)
340 DPRINTF( "%p free %08lx prev=%p next=%p\n",
341 &heap->freeList[i].arena, HEAP_freeListSizes[i],
342 LIST_ENTRY( heap->freeList[i].arena.entry.prev, ARENA_FREE, entry ),
343 LIST_ENTRY( heap->freeList[i].arena.entry.next, ARENA_FREE, entry ));
344
345 LIST_FOR_EACH_ENTRY( subheap, &heap->subheap_list, SUBHEAP, entry )
346 {
347 SIZE_T freeSize = 0, usedSize = 0, arenaSize = subheap->headerSize;
348 DPRINTF( "\n\nSub-heap %p: base=%p size=%08lx committed=%08lx\n",
349 subheap, subheap->base, subheap->size, subheap->commitSize );
350
351 DPRINTF( "\n Block Arena Stat Size Id\n" );
352 ptr = (char *)subheap->base + subheap->headerSize;
353 while (ptr < (char *)subheap->base + subheap->size)
354 {
355 if (*(DWORD *)ptr & ARENA_FLAG_FREE)
356 {
357 ARENA_FREE *pArena = (ARENA_FREE *)ptr;
358 DPRINTF( "%p %08x free %08x prev=%p next=%p\n",
359 pArena, pArena->magic,
360 pArena->size & ARENA_SIZE_MASK,
361 LIST_ENTRY( pArena->entry.prev, ARENA_FREE, entry ),
362 LIST_ENTRY( pArena->entry.next, ARENA_FREE, entry ) );
363 ptr += sizeof(*pArena) + (pArena->size & ARENA_SIZE_MASK);
364 arenaSize += sizeof(ARENA_FREE);
365 freeSize += pArena->size & ARENA_SIZE_MASK;
366 }
367 else if (*(DWORD *)ptr & ARENA_FLAG_PREV_FREE)
368 {
369 ARENA_INUSE *pArena = (ARENA_INUSE *)ptr;
370 DPRINTF( "%p %08x Used %08x back=%p\n",
371 pArena, pArena->magic, pArena->size & ARENA_SIZE_MASK, *((ARENA_FREE **)pArena - 1) );
372 ptr += sizeof(*pArena) + (pArena->size & ARENA_SIZE_MASK);
373 arenaSize += sizeof(ARENA_INUSE);
374 usedSize += pArena->size & ARENA_SIZE_MASK;
375 }
376 else
377 {
378 ARENA_INUSE *pArena = (ARENA_INUSE *)ptr;
379 DPRINTF( "%p %08x %s %08x\n",
380 pArena, pArena->magic, pArena->magic == ARENA_INUSE_MAGIC ? "used" : "pend",
381 pArena->size & ARENA_SIZE_MASK );
382 ptr += sizeof(*pArena) + (pArena->size & ARENA_SIZE_MASK);
383 arenaSize += sizeof(ARENA_INUSE);
384 usedSize += pArena->size & ARENA_SIZE_MASK;
385 }
386 }
387 DPRINTF( "\nTotal: Size=%08lx Committed=%08lx Free=%08lx Used=%08lx Arenas=%08lx (%ld%%)\n\n",
388 subheap->size, subheap->commitSize, freeSize, usedSize,
389 arenaSize, (arenaSize * 100) / subheap->size );
390 }
391 }
392
393
394 static void HEAP_DumpEntry( LPPROCESS_HEAP_ENTRY entry )
395 {
396 WORD rem_flags;
397 TRACE( "Dumping entry %p\n", entry );
398 TRACE( "lpData\t\t: %p\n", entry->lpData );
399 TRACE( "cbData\t\t: %08x\n", entry->cbData);
400 TRACE( "cbOverhead\t: %08x\n", entry->cbOverhead);
401 TRACE( "iRegionIndex\t: %08x\n", entry->iRegionIndex);
402 TRACE( "WFlags\t\t: ");
403 if (entry->wFlags & PROCESS_HEAP_REGION)
404 TRACE( "PROCESS_HEAP_REGION ");
405 if (entry->wFlags & PROCESS_HEAP_UNCOMMITTED_RANGE)
406 TRACE( "PROCESS_HEAP_UNCOMMITTED_RANGE ");
407 if (entry->wFlags & PROCESS_HEAP_ENTRY_BUSY)
408 TRACE( "PROCESS_HEAP_ENTRY_BUSY ");
409 if (entry->wFlags & PROCESS_HEAP_ENTRY_MOVEABLE)
410 TRACE( "PROCESS_HEAP_ENTRY_MOVEABLE ");
411 if (entry->wFlags & PROCESS_HEAP_ENTRY_DDESHARE)
412 TRACE( "PROCESS_HEAP_ENTRY_DDESHARE ");
413 rem_flags = entry->wFlags &
414 ~(PROCESS_HEAP_REGION | PROCESS_HEAP_UNCOMMITTED_RANGE |
415 PROCESS_HEAP_ENTRY_BUSY | PROCESS_HEAP_ENTRY_MOVEABLE|
416 PROCESS_HEAP_ENTRY_DDESHARE);
417 if (rem_flags)
418 TRACE( "Unknown %08x", rem_flags);
419 TRACE( "\n");
420 if ((entry->wFlags & PROCESS_HEAP_ENTRY_BUSY )
421 && (entry->wFlags & PROCESS_HEAP_ENTRY_MOVEABLE))
422 {
423 /* Treat as block */
424 TRACE( "BLOCK->hMem\t\t:%p\n", entry->u.Block.hMem);
425 }
426 if (entry->wFlags & PROCESS_HEAP_REGION)
427 {
428 TRACE( "Region.dwCommittedSize\t:%08x\n",entry->u.Region.dwCommittedSize);
429 TRACE( "Region.dwUnCommittedSize\t:%08x\n",entry->u.Region.dwUnCommittedSize);
430 TRACE( "Region.lpFirstBlock\t:%p\n",entry->u.Region.lpFirstBlock);
431 TRACE( "Region.lpLastBlock\t:%p\n",entry->u.Region.lpLastBlock);
432 }
433 }
434
435 /***********************************************************************
436 * HEAP_GetPtr
437 * RETURNS
438 * Pointer to the heap
439 * NULL: Failure
440 */
441 static HEAP *HEAP_GetPtr(
442 HANDLE heap /* [in] Handle to the heap */
443 ) {
444 HEAP *heapPtr = heap;
445 if (!heapPtr || (heapPtr->magic != HEAP_MAGIC))
446 {
447 ERR("Invalid heap %p!\n", heap );
448 return NULL;
449 }
450 if ((heapPtr->flags & HEAP_VALIDATE_ALL) && !HEAP_IsRealArena( heapPtr, 0, NULL, NOISY ))
451 {
452 if (TRACE_ON(heap))
453 {
454 HEAP_Dump( heapPtr );
455 assert( FALSE );
456 }
457 return NULL;
458 }
459 return heapPtr;
460 }
461
462
463 /***********************************************************************
464 * HEAP_InsertFreeBlock
465 *
466 * Insert a free block into the free list.
467 */
468 static inline void HEAP_InsertFreeBlock( HEAP *heap, ARENA_FREE *pArena, BOOL last )
469 {
470 FREE_LIST_ENTRY *pEntry = heap->freeList + get_freelist_index( pArena->size + sizeof(*pArena) );
471 if (last)
472 {
473 /* insert at end of free list, i.e. before the next free list entry */
474 pEntry++;
475 if (pEntry == &heap->freeList[HEAP_NB_FREE_LISTS]) pEntry = heap->freeList;
476 list_add_before( &pEntry->arena.entry, &pArena->entry );
477 }
478 else
479 {
480 /* insert at head of free list */
481 list_add_after( &pEntry->arena.entry, &pArena->entry );
482 }
483 pArena->size |= ARENA_FLAG_FREE;
484 }
485
486
487 /***********************************************************************
488 * HEAP_FindSubHeap
489 * Find the sub-heap containing a given address.
490 *
491 * RETURNS
492 * Pointer: Success
493 * NULL: Failure
494 */
495 static SUBHEAP *HEAP_FindSubHeap(
496 const HEAP *heap, /* [in] Heap pointer */
497 LPCVOID ptr ) /* [in] Address */
498 {
499 SUBHEAP *sub;
500 LIST_FOR_EACH_ENTRY( sub, &heap->subheap_list, SUBHEAP, entry )
501 if ((ptr >= sub->base) &&
502 ((const char *)ptr < (const char *)sub->base + sub->size - sizeof(ARENA_INUSE)))
503 return sub;
504 return NULL;
505 }
506
507
508 /***********************************************************************
509 * HEAP_Commit
510 *
511 * Make sure the heap storage is committed for a given size in the specified arena.
512 */
513 static inline BOOL HEAP_Commit( SUBHEAP *subheap, ARENA_INUSE *pArena, SIZE_T data_size )
514 {
515 void *ptr = (char *)(pArena + 1) + data_size + sizeof(ARENA_FREE);
516 SIZE_T size = (char *)ptr - (char *)subheap->base;
517 size = (size + COMMIT_MASK) & ~COMMIT_MASK;
518 if (size > subheap->size) size = subheap->size;
519 if (size <= subheap->commitSize) return TRUE;
520 size -= subheap->commitSize;
521 ptr = (char *)subheap->base + subheap->commitSize;
522 if (NtAllocateVirtualMemory( NtCurrentProcess(), &ptr, 0,
523 &size, MEM_COMMIT, get_protection_type( subheap->heap->flags ) ))
524 {
525 WARN("Could not commit %08lx bytes at %p for heap %p\n",
526 size, ptr, subheap->heap );
527 return FALSE;
528 }
529 subheap->commitSize += size;
530 return TRUE;
531 }
532
533
534 /***********************************************************************
535 * HEAP_Decommit
536 *
537 * If possible, decommit the heap storage from (including) 'ptr'.
538 */
539 static inline BOOL HEAP_Decommit( SUBHEAP *subheap, void *ptr )
540 {
541 void *addr;
542 SIZE_T decommit_size;
543 SIZE_T size = (char *)ptr - (char *)subheap->base;
544
545 /* round to next block and add one full block */
546 size = ((size + COMMIT_MASK) & ~COMMIT_MASK) + COMMIT_MASK + 1;
547 size = max( size, subheap->min_commit );
548 if (size >= subheap->commitSize) return TRUE;
549 decommit_size = subheap->commitSize - size;
550 addr = (char *)subheap->base + size;
551
552 if (NtFreeVirtualMemory( NtCurrentProcess(), &addr, &decommit_size, MEM_DECOMMIT ))
553 {
554 WARN("Could not decommit %08lx bytes at %p for heap %p\n",
555 decommit_size, (char *)subheap->base + size, subheap->heap );
556 return FALSE;
557 }
558 subheap->commitSize -= decommit_size;
559 return TRUE;
560 }
561
562
563 /***********************************************************************
564 * HEAP_CreateFreeBlock
565 *
566 * Create a free block at a specified address. 'size' is the size of the
567 * whole block, including the new arena.
568 */
569 static void HEAP_CreateFreeBlock( SUBHEAP *subheap, void *ptr, SIZE_T size )
570 {
571 ARENA_FREE *pFree;
572 char *pEnd;
573 BOOL last;
574 DWORD flags = subheap->heap->flags;
575
576 /* Create a free arena */
577 mark_block_uninitialized( ptr, sizeof(ARENA_FREE) );
578 pFree = ptr;
579 pFree->magic = ARENA_FREE_MAGIC;
580
581 /* If debugging, erase the freed block content */
582
583 pEnd = (char *)ptr + size;
584 if (pEnd > (char *)subheap->base + subheap->commitSize)
585 pEnd = (char *)subheap->base + subheap->commitSize;
586 if (pEnd > (char *)(pFree + 1)) mark_block_free( pFree + 1, pEnd - (char *)(pFree + 1), flags );
587
588 /* Check if next block is free also */
589
590 if (((char *)ptr + size < (char *)subheap->base + subheap->size) &&
591 (*(DWORD *)((char *)ptr + size) & ARENA_FLAG_FREE))
592 {
593 /* Remove the next arena from the free list */
594 ARENA_FREE *pNext = (ARENA_FREE *)((char *)ptr + size);
595 list_remove( &pNext->entry );
596 size += (pNext->size & ARENA_SIZE_MASK) + sizeof(*pNext);
597 mark_block_free( pNext, sizeof(ARENA_FREE), flags );
598 }
599
600 /* Set the next block PREV_FREE flag and pointer */
601
602 last = ((char *)ptr + size >= (char *)subheap->base + subheap->size);
603 if (!last)
604 {
605 DWORD *pNext = (DWORD *)((char *)ptr + size);
606 *pNext |= ARENA_FLAG_PREV_FREE;
607 mark_block_initialized( (ARENA_FREE **)pNext - 1, sizeof( ARENA_FREE * ) );
608 *((ARENA_FREE **)pNext - 1) = pFree;
609 }
610
611 /* Last, insert the new block into the free list */
612
613 pFree->size = size - sizeof(*pFree);
614 HEAP_InsertFreeBlock( subheap->heap, pFree, last );
615 }
616
617
618 /***********************************************************************
619 * HEAP_MakeInUseBlockFree
620 *
621 * Turn an in-use block into a free block. Can also decommit the end of
622 * the heap, and possibly even free the sub-heap altogether.
623 */
624 static void HEAP_MakeInUseBlockFree( SUBHEAP *subheap, ARENA_INUSE *pArena )
625 {
626 HEAP *heap = subheap->heap;
627 ARENA_FREE *pFree;
628 SIZE_T size;
629
630 if (heap->pending_free)
631 {
632 ARENA_INUSE *prev = heap->pending_free[heap->pending_pos];
633 heap->pending_free[heap->pending_pos] = pArena;
634 heap->pending_pos = (heap->pending_pos + 1) % MAX_FREE_PENDING;
635 pArena->magic = ARENA_PENDING_MAGIC;
636 mark_block_free( pArena + 1, pArena->size & ARENA_SIZE_MASK, heap->flags );
637 if (!prev) return;
638 pArena = prev;
639 subheap = HEAP_FindSubHeap( heap, pArena );
640 }
641
642 /* Check if we can merge with previous block */
643
644 size = (pArena->size & ARENA_SIZE_MASK) + sizeof(*pArena);
645 if (pArena->size & ARENA_FLAG_PREV_FREE)
646 {
647 pFree = *((ARENA_FREE **)pArena - 1);
648 size += (pFree->size & ARENA_SIZE_MASK) + sizeof(ARENA_FREE);
649 /* Remove it from the free list */
650 list_remove( &pFree->entry );
651 }
652 else pFree = (ARENA_FREE *)pArena;
653
654 /* Create a free block */
655
656 HEAP_CreateFreeBlock( subheap, pFree, size );
657 size = (pFree->size & ARENA_SIZE_MASK) + sizeof(ARENA_FREE);
658 if ((char *)pFree + size < (char *)subheap->base + subheap->size)
659 return; /* Not the last block, so nothing more to do */
660
661 /* Free the whole sub-heap if it's empty and not the original one */
662
663 if (((char *)pFree == (char *)subheap->base + subheap->headerSize) &&
664 (subheap != &subheap->heap->subheap))
665 {
666 void *addr = subheap->base;
667
668 size = 0;
669 /* Remove the free block from the list */
670 list_remove( &pFree->entry );
671 /* Remove the subheap from the list */
672 list_remove( &subheap->entry );
673 /* Free the memory */
674 subheap->magic = 0;
675 NtFreeVirtualMemory( NtCurrentProcess(), &addr, &size, MEM_RELEASE );
676 return;
677 }
678
679 /* Decommit the end of the heap */
680
681 if (!(subheap->heap->flags & HEAP_SHARED)) HEAP_Decommit( subheap, pFree + 1 );
682 }
683
684
685 /***********************************************************************
686 * HEAP_ShrinkBlock
687 *
688 * Shrink an in-use block.
689 */
690 static void HEAP_ShrinkBlock(SUBHEAP *subheap, ARENA_INUSE *pArena, SIZE_T size)
691 {
692 if ((pArena->size & ARENA_SIZE_MASK) >= size + HEAP_MIN_SHRINK_SIZE)
693 {
694 HEAP_CreateFreeBlock( subheap, (char *)(pArena + 1) + size,
695 (pArena->size & ARENA_SIZE_MASK) - size );
696 /* assign size plus previous arena flags */
697 pArena->size = size | (pArena->size & ~ARENA_SIZE_MASK);
698 }
699 else
700 {
701 /* Turn off PREV_FREE flag in next block */
702 char *pNext = (char *)(pArena + 1) + (pArena->size & ARENA_SIZE_MASK);
703 if (pNext < (char *)subheap->base + subheap->size)
704 *(DWORD *)pNext &= ~ARENA_FLAG_PREV_FREE;
705 }
706 }
707
708
709 /***********************************************************************
710 * allocate_large_block
711 */
712 static void *allocate_large_block( HEAP *heap, DWORD flags, SIZE_T size )
713 {
714 ARENA_LARGE *arena;
715 SIZE_T block_size = sizeof(*arena) + ROUND_SIZE(size) + HEAP_TAIL_EXTRA_SIZE(flags);
716 LPVOID address = NULL;
717
718 if (block_size < size) return NULL; /* overflow */
719 if (NtAllocateVirtualMemory( NtCurrentProcess(), &address, 5,
720 &block_size, MEM_COMMIT, get_protection_type( flags ) ))
721 {
722 WARN("Could not allocate block for %08lx bytes\n", size );
723 return NULL;
724 }
725 arena = address;
726 arena->data_size = size;
727 arena->block_size = block_size;
728 arena->size = ARENA_LARGE_SIZE;
729 arena->magic = ARENA_LARGE_MAGIC;
730 mark_block_tail( (char *)(arena + 1) + size, block_size - sizeof(*arena) - size, flags );
731 list_add_tail( &heap->large_list, &arena->entry );
732 notify_alloc( arena + 1, size, flags & HEAP_ZERO_MEMORY );
733 return arena + 1;
734 }
735
736
737 /***********************************************************************
738 * free_large_block
739 */
740 static void free_large_block( HEAP *heap, DWORD flags, void *ptr )
741 {
742 ARENA_LARGE *arena = (ARENA_LARGE *)ptr - 1;
743 LPVOID address = arena;
744 SIZE_T size = 0;
745
746 list_remove( &arena->entry );
747 NtFreeVirtualMemory( NtCurrentProcess(), &address, &size, MEM_RELEASE );
748 }
749
750
751 /***********************************************************************
752 * realloc_large_block
753 */
754 static void *realloc_large_block( HEAP *heap, DWORD flags, void *ptr, SIZE_T size )
755 {
756 ARENA_LARGE *arena = (ARENA_LARGE *)ptr - 1;
757 void *new_ptr;
758
759 if (arena->block_size - sizeof(*arena) >= size)
760 {
761 SIZE_T unused = arena->block_size - sizeof(*arena) - size;
762
763 /* FIXME: we could remap zero-pages instead */
764 #ifdef VALGRIND_RESIZEINPLACE_BLOCK
765 if (RUNNING_ON_VALGRIND)
766 notify_realloc( arena + 1, arena->data_size, size );
767 else
768 #endif
769 if (size > arena->data_size)
770 initialize_block( (char *)ptr + arena->data_size, size - arena->data_size, unused, flags );
771 else
772 mark_block_tail( (char *)ptr + size, unused, flags );
773 arena->data_size = size;
774 return ptr;
775 }
776 if (flags & HEAP_REALLOC_IN_PLACE_ONLY) return NULL;
777 if (!(new_ptr = allocate_large_block( heap, flags, size )))
778 {
779 WARN("Could not allocate block for %08lx bytes\n", size );
780 return NULL;
781 }
782 memcpy( new_ptr, ptr, arena->data_size );
783 free_large_block( heap, flags, ptr );
784 notify_free( ptr );
785 return new_ptr;
786 }
787
788
789 /***********************************************************************
790 * find_large_block
791 */
792 static ARENA_LARGE *find_large_block( HEAP *heap, const void *ptr )
793 {
794 ARENA_LARGE *arena;
795
796 LIST_FOR_EACH_ENTRY( arena, &heap->large_list, ARENA_LARGE, entry )
797 if (ptr == arena + 1) return arena;
798
799 return NULL;
800 }
801
802
803 /***********************************************************************
804 * validate_large_arena
805 */
806 static BOOL validate_large_arena( HEAP *heap, const ARENA_LARGE *arena, BOOL quiet )
807 {
808 DWORD flags = heap->flags;
809
810 if ((ULONG_PTR)arena % page_size)
811 {
812 if (quiet == NOISY)
813 {
814 ERR( "Heap %p: invalid large arena pointer %p\n", heap, arena );
815 if (TRACE_ON(heap)) HEAP_Dump( heap );
816 }
817 else if (WARN_ON(heap))
818 {
819 WARN( "Heap %p: unaligned arena pointer %p\n", heap, arena );
820 if (TRACE_ON(heap)) HEAP_Dump( heap );
821 }
822 return FALSE;
823 }
824 if (arena->size != ARENA_LARGE_SIZE || arena->magic != ARENA_LARGE_MAGIC)
825 {
826 if (quiet == NOISY)
827 {
828 ERR( "Heap %p: invalid large arena %p values %x/%x\n",
829 heap, arena, arena->size, arena->magic );
830 if (TRACE_ON(heap)) HEAP_Dump( heap );
831 }
832 else if (WARN_ON(heap))
833 {
834 WARN( "Heap %p: invalid large arena %p values %x/%x\n",
835 heap, arena, arena->size, arena->magic );
836 if (TRACE_ON(heap)) HEAP_Dump( heap );
837 }
838 return FALSE;
839 }
840 if (arena->data_size > arena->block_size - sizeof(*arena))
841 {
842 ERR( "Heap %p: invalid large arena %p size %lx/%lx\n",
843 heap, arena, arena->data_size, arena->block_size );
844 return FALSE;
845 }
846 if (flags & HEAP_TAIL_CHECKING_ENABLED)
847 {
848 SIZE_T i, unused = arena->block_size - sizeof(*arena) - arena->data_size;
849 const unsigned char *data = (const unsigned char *)(arena + 1) + arena->data_size;
850
851 for (i = 0; i < unused; i++)
852 {
853 if (data[i] == ARENA_TAIL_FILLER) continue;
854 ERR("Heap %p: block %p tail overwritten at %p (byte %lu/%lu == 0x%02x)\n",
855 heap, arena + 1, data + i, i, unused, data[i] );
856 return FALSE;
857 }
858 }
859 return TRUE;
860 }
861
862
863 /***********************************************************************
864 * HEAP_CreateSubHeap
865 */
866 static SUBHEAP *HEAP_CreateSubHeap( HEAP *heap, LPVOID address, DWORD flags,
867 SIZE_T commitSize, SIZE_T totalSize )
868 {
869 SUBHEAP *subheap;
870 FREE_LIST_ENTRY *pEntry;
871 unsigned int i;
872
873 if (!address)
874 {
875 if (!commitSize) commitSize = COMMIT_MASK + 1;
876 totalSize = min( totalSize, 0xffff0000 ); /* don't allow a heap larger than 4Gb */
877 if (totalSize < commitSize) totalSize = commitSize;
878 if (flags & HEAP_SHARED) commitSize = totalSize; /* always commit everything in a shared heap */
879 commitSize = min( totalSize, (commitSize + COMMIT_MASK) & ~COMMIT_MASK );
880
881 /* allocate the memory block */
882 if (NtAllocateVirtualMemory( NtCurrentProcess(), &address, 5, &totalSize,
883 MEM_RESERVE, get_protection_type( flags ) ))
884 {
885 WARN("Could not allocate %08lx bytes\n", totalSize );
886 return NULL;
887 }
888 if (NtAllocateVirtualMemory( NtCurrentProcess(), &address, 0,
889 &commitSize, MEM_COMMIT, get_protection_type( flags ) ))
890 {
891 WARN("Could not commit %08lx bytes for sub-heap %p\n", commitSize, address );
892 return NULL;
893 }
894 }
895
896 if (heap)
897 {
898 /* If this is a secondary subheap, insert it into list */
899
900 subheap = address;
901 subheap->base = address;
902 subheap->heap = heap;
903 subheap->size = totalSize;
904 subheap->min_commit = 0x10000;
905 subheap->commitSize = commitSize;
906 subheap->magic = SUBHEAP_MAGIC;
907 subheap->headerSize = ROUND_SIZE( sizeof(SUBHEAP) );
908 list_add_head( &heap->subheap_list, &subheap->entry );
909 }
910 else
911 {
912 /* If this is a primary subheap, initialize main heap */
913
914 heap = address;
915 heap->flags = flags;
916 heap->magic = HEAP_MAGIC;
917 heap->grow_size = max( HEAP_DEF_SIZE, totalSize );
918 list_init( &heap->subheap_list );
919 list_init( &heap->large_list );
920
921 subheap = &heap->subheap;
922 subheap->base = address;
923 subheap->heap = heap;
924 subheap->size = totalSize;
925 subheap->min_commit = commitSize;
926 subheap->commitSize = commitSize;
927 subheap->magic = SUBHEAP_MAGIC;
928 subheap->headerSize = ROUND_SIZE( sizeof(HEAP) );
929 list_add_head( &heap->subheap_list, &subheap->entry );
930
931 /* Build the free lists */
932
933 heap->freeList = (FREE_LIST_ENTRY *)((char *)heap + subheap->headerSize);
934 subheap->headerSize += HEAP_NB_FREE_LISTS * sizeof(FREE_LIST_ENTRY);
935 list_init( &heap->freeList[0].arena.entry );
936 for (i = 0, pEntry = heap->freeList; i < HEAP_NB_FREE_LISTS; i++, pEntry++)
937 {
938 pEntry->arena.size = 0 | ARENA_FLAG_FREE;
939 pEntry->arena.magic = ARENA_FREE_MAGIC;
940 if (i) list_add_after( &pEntry[-1].arena.entry, &pEntry->arena.entry );
941 }
942
943 /* Initialize critical section */
944
945 if (!processHeap) /* do it by hand to avoid memory allocations */
946 {
947 heap->critSection.DebugInfo = &process_heap_critsect_debug;
948 heap->critSection.LockCount = -1;
949 heap->critSection.RecursionCount = 0;
950 heap->critSection.OwningThread = 0;
951 heap->critSection.LockSemaphore = 0;
952 heap->critSection.SpinCount = 0;
953 process_heap_critsect_debug.CriticalSection = &heap->critSection;
954 }
955 else
956 {
957 RtlInitializeCriticalSection( &heap->critSection );
958 heap->critSection.DebugInfo->Spare[0] = (DWORD_PTR)(__FILE__ ": HEAP.critSection");
959 }
960
961 if (flags & HEAP_SHARED)
962 {
963 /* let's assume that only one thread at a time will try to do this */
964 HANDLE sem = heap->critSection.LockSemaphore;
965 if (!sem) NtCreateSemaphore( &sem, SEMAPHORE_ALL_ACCESS, NULL, 0, 1 );
966
967 NtDuplicateObject( NtCurrentProcess(), sem, NtCurrentProcess(), &sem, 0, 0,
968 DUP_HANDLE_MAKE_GLOBAL | DUP_HANDLE_SAME_ACCESS | DUP_HANDLE_CLOSE_SOURCE );
969 heap->critSection.LockSemaphore = sem;
970 RtlFreeHeap( processHeap, 0, heap->critSection.DebugInfo );
971 heap->critSection.DebugInfo = NULL;
972 }
973 }
974
975 /* Create the first free block */
976
977 HEAP_CreateFreeBlock( subheap, (LPBYTE)subheap->base + subheap->headerSize,
978 subheap->size - subheap->headerSize );
979
980 return subheap;
981 }
982
983
984 /***********************************************************************
985 * HEAP_FindFreeBlock
986 *
987 * Find a free block at least as large as the requested size, and make sure
988 * the requested size is committed.
989 */
990 static ARENA_FREE *HEAP_FindFreeBlock( HEAP *heap, SIZE_T size,
991 SUBHEAP **ppSubHeap )
992 {
993 SUBHEAP *subheap;
994 struct list *ptr;
995 SIZE_T total_size;
996 FREE_LIST_ENTRY *pEntry = heap->freeList + get_freelist_index( size + sizeof(ARENA_INUSE) );
997
998 /* Find a suitable free list, and in it find a block large enough */
999
1000 ptr = &pEntry->arena.entry;
1001 while ((ptr = list_next( &heap->freeList[0].arena.entry, ptr )))
1002 {
1003 ARENA_FREE *pArena = LIST_ENTRY( ptr, ARENA_FREE, entry );
1004 SIZE_T arena_size = (pArena->size & ARENA_SIZE_MASK) +
1005 sizeof(ARENA_FREE) - sizeof(ARENA_INUSE);
1006 if (arena_size >= size)
1007 {
1008 subheap = HEAP_FindSubHeap( heap, pArena );
1009 if (!HEAP_Commit( subheap, (ARENA_INUSE *)pArena, size )) return NULL;
1010 *ppSubHeap = subheap;
1011 return pArena;
1012 }
1013 }
1014
1015 /* If no block was found, attempt to grow the heap */
1016
1017 if (!(heap->flags & HEAP_GROWABLE))
1018 {
1019 WARN("Not enough space in heap %p for %08lx bytes\n", heap, size );
1020 return NULL;
1021 }
1022 /* make sure that we have a big enough size *committed* to fit another
1023 * last free arena in !
1024 * So just one heap struct, one first free arena which will eventually
1025 * get used, and a second free arena that might get assigned all remaining
1026 * free space in HEAP_ShrinkBlock() */
1027 total_size = size + ROUND_SIZE(sizeof(SUBHEAP)) + sizeof(ARENA_INUSE) + sizeof(ARENA_FREE);
1028 if (total_size < size) return NULL; /* overflow */
1029
1030 if ((subheap = HEAP_CreateSubHeap( heap, NULL, heap->flags, total_size,
1031 max( heap->grow_size, total_size ) )))
1032 {
1033 if (heap->grow_size < 128 * 1024 * 1024) heap->grow_size *= 2;
1034 }
1035 else while (!subheap) /* shrink the grow size again if we are running out of space */
1036 {
1037 if (heap->grow_size <= total_size || heap->grow_size <= 4 * 1024 * 1024) return NULL;
1038 heap->grow_size /= 2;
1039 subheap = HEAP_CreateSubHeap( heap, NULL, heap->flags, total_size,
1040 max( heap->grow_size, total_size ) );
1041 }
1042
1043 TRACE("created new sub-heap %p of %08lx bytes for heap %p\n",
1044 subheap, subheap->size, heap );
1045
1046 *ppSubHeap = subheap;
1047 return (ARENA_FREE *)((char *)subheap->base + subheap->headerSize);
1048 }
1049
1050
1051 /***********************************************************************
1052 * HEAP_IsValidArenaPtr
1053 *
1054 * Check that the pointer is inside the range possible for arenas.
1055 */
1056 static BOOL HEAP_IsValidArenaPtr( const HEAP *heap, const ARENA_FREE *ptr )
1057 {
1058 unsigned int i;
1059 const SUBHEAP *subheap = HEAP_FindSubHeap( heap, ptr );
1060 if (!subheap) return FALSE;
1061 if ((const char *)ptr >= (const char *)subheap->base + subheap->headerSize) return TRUE;
1062 if (subheap != &heap->subheap) return FALSE;
1063 for (i = 0; i < HEAP_NB_FREE_LISTS; i++)
1064 if (ptr == &heap->freeList[i].arena) return TRUE;
1065 return FALSE;
1066 }
1067
1068
1069 /***********************************************************************
1070 * HEAP_ValidateFreeArena
1071 */
1072 static BOOL HEAP_ValidateFreeArena( SUBHEAP *subheap, ARENA_FREE *pArena )
1073 {
1074 DWORD flags = subheap->heap->flags;
1075 SIZE_T size;
1076 ARENA_FREE *prev, *next;
1077 char *heapEnd = (char *)subheap->base + subheap->size;
1078
1079 /* Check for unaligned pointers */
1080 if ((ULONG_PTR)pArena % ALIGNMENT != ARENA_OFFSET)
1081 {
1082 ERR("Heap %p: unaligned arena pointer %p\n", subheap->heap, pArena );
1083 return FALSE;
1084 }
1085
1086 /* Check magic number */
1087 if (pArena->magic != ARENA_FREE_MAGIC)
1088 {
1089 ERR("Heap %p: invalid free arena magic %08x for %p\n", subheap->heap, pArena->magic, pArena );
1090 return FALSE;
1091 }
1092 /* Check size flags */
1093 if (!(pArena->size & ARENA_FLAG_FREE) ||
1094 (pArena->size & ARENA_FLAG_PREV_FREE))
1095 {
1096 ERR("Heap %p: bad flags %08x for free arena %p\n",
1097 subheap->heap, pArena->size & ~ARENA_SIZE_MASK, pArena );
1098 return FALSE;
1099 }
1100 /* Check arena size */
1101 size = pArena->size & ARENA_SIZE_MASK;
1102 if ((char *)(pArena + 1) + size > heapEnd)
1103 {
1104 ERR("Heap %p: bad size %08lx for free arena %p\n", subheap->heap, size, pArena );
1105 return FALSE;
1106 }
1107 /* Check that next pointer is valid */
1108 next = LIST_ENTRY( pArena->entry.next, ARENA_FREE, entry );
1109 if (!HEAP_IsValidArenaPtr( subheap->heap, next ))
1110 {
1111 ERR("Heap %p: bad next ptr %p for arena %p\n",
1112 subheap->heap, next, pArena );
1113 return FALSE;
1114 }
1115 /* Check that next arena is free */
1116 if (!(next->size & ARENA_FLAG_FREE) || (next->magic != ARENA_FREE_MAGIC))
1117 {
1118 ERR("Heap %p: next arena %p invalid for %p\n",
1119 subheap->heap, next, pArena );
1120 return FALSE;
1121 }
1122 /* Check that prev pointer is valid */
1123 prev = LIST_ENTRY( pArena->entry.prev, ARENA_FREE, entry );
1124 if (!HEAP_IsValidArenaPtr( subheap->heap, prev ))
1125 {
1126 ERR("Heap %p: bad prev ptr %p for arena %p\n",
1127 subheap->heap, prev, pArena );
1128 return FALSE;
1129 }
1130 /* Check that prev arena is free */
1131 if (!(prev->size & ARENA_FLAG_FREE) || (prev->magic != ARENA_FREE_MAGIC))
1132 {
1133 /* this often means that the prev arena got overwritten
1134 * by a memory write before that prev arena */
1135 ERR("Heap %p: prev arena %p invalid for %p\n",
1136 subheap->heap, prev, pArena );
1137 return FALSE;
1138 }
1139 /* Check that next block has PREV_FREE flag */
1140 if ((char *)(pArena + 1) + size < heapEnd)
1141 {
1142 if (!(*(DWORD *)((char *)(pArena + 1) + size) & ARENA_FLAG_PREV_FREE))
1143 {
1144 ERR("Heap %p: free arena %p next block has no PREV_FREE flag\n",
1145 subheap->heap, pArena );
1146 return FALSE;
1147 }
1148 /* Check next block back pointer */
1149 if (*((ARENA_FREE **)((char *)(pArena + 1) + size) - 1) != pArena)
1150 {
1151 ERR("Heap %p: arena %p has wrong back ptr %p\n",
1152 subheap->heap, pArena,
1153 *((ARENA_FREE **)((char *)(pArena+1) + size) - 1));
1154 return FALSE;
1155 }
1156 }
1157 if (flags & HEAP_FREE_CHECKING_ENABLED)
1158 {
1159 DWORD *ptr = (DWORD *)(pArena + 1);
1160 char *end = (char *)(pArena + 1) + size;
1161
1162 if (end >= heapEnd) end = (char *)subheap->base + subheap->commitSize;
1163 else end -= sizeof(ARENA_FREE *);
1164 while (ptr < (DWORD *)end)
1165 {
1166 if (*ptr != ARENA_FREE_FILLER)
1167 {
1168 ERR("Heap %p: free block %p overwritten at %p by %08x\n",
1169 subheap->heap, (ARENA_INUSE *)pArena + 1, ptr, *ptr );
1170 return FALSE;
1171 }
1172 ptr++;
1173 }
1174 }
1175 return TRUE;
1176 }
1177
1178
1179 /***********************************************************************
1180 * HEAP_ValidateInUseArena
1181 */
1182 static BOOL HEAP_ValidateInUseArena( const SUBHEAP *subheap, const ARENA_INUSE *pArena, BOOL quiet )
1183 {
1184 SIZE_T size;
1185 DWORD i, flags = subheap->heap->flags;
1186 const char *heapEnd = (const char *)subheap->base + subheap->size;
1187
1188 /* Check for unaligned pointers */
1189 if ((ULONG_PTR)pArena % ALIGNMENT != ARENA_OFFSET)
1190 {
1191 if ( quiet == NOISY )
1192 {
1193 ERR( "Heap %p: unaligned arena pointer %p\n", subheap->heap, pArena );
1194 if ( TRACE_ON(heap) )
1195 HEAP_Dump( subheap->heap );
1196 }
1197 else if ( WARN_ON(heap) )
1198 {
1199 WARN( "Heap %p: unaligned arena pointer %p\n", subheap->heap, pArena );
1200 if ( TRACE_ON(heap) )
1201 HEAP_Dump( subheap->heap );
1202 }
1203 return FALSE;
1204 }
1205
1206 /* Check magic number */
1207 if (pArena->magic != ARENA_INUSE_MAGIC && pArena->magic != ARENA_PENDING_MAGIC)
1208 {
1209 if (quiet == NOISY) {
1210 ERR("Heap %p: invalid in-use arena magic %08x for %p\n", subheap->heap, pArena->magic, pArena );
1211 if (TRACE_ON(heap))
1212 HEAP_Dump( subheap->heap );
1213 } else if (WARN_ON(heap)) {
1214 WARN("Heap %p: invalid in-use arena magic %08x for %p\n", subheap->heap, pArena->magic, pArena );
1215 if (TRACE_ON(heap))
1216 HEAP_Dump( subheap->heap );
1217 }
1218 return FALSE;
1219 }
1220 /* Check size flags */
1221 if (pArena->size & ARENA_FLAG_FREE)
1222 {
1223 ERR("Heap %p: bad flags %08x for in-use arena %p\n",
1224 subheap->heap, pArena->size & ~ARENA_SIZE_MASK, pArena );
1225 return FALSE;
1226 }
1227 /* Check arena size */
1228 size = pArena->size & ARENA_SIZE_MASK;
1229 if ((const char *)(pArena + 1) + size > heapEnd ||
1230 (const char *)(pArena + 1) + size < (const char *)(pArena + 1))
1231 {
1232 ERR("Heap %p: bad size %08lx for in-use arena %p\n", subheap->heap, size, pArena );
1233 return FALSE;
1234 }
1235 /* Check next arena PREV_FREE flag */
1236 if (((const char *)(pArena + 1) + size < heapEnd) &&
1237 (*(const DWORD *)((const char *)(pArena + 1) + size) & ARENA_FLAG_PREV_FREE))
1238 {
1239 ERR("Heap %p: in-use arena %p next block %p has PREV_FREE flag %x\n",
1240 subheap->heap, pArena, (const char *)(pArena + 1) + size,*(const DWORD *)((const char *)(pArena + 1) + size) );
1241 return FALSE;
1242 }
1243 /* Check prev free arena */
1244 if (pArena->size & ARENA_FLAG_PREV_FREE)
1245 {
1246 const ARENA_FREE *pPrev = *((const ARENA_FREE * const*)pArena - 1);
1247 /* Check prev pointer */
1248 if (!HEAP_IsValidArenaPtr( subheap->heap, pPrev ))
1249 {
1250 ERR("Heap %p: bad back ptr %p for arena %p\n",
1251 subheap->heap, pPrev, pArena );
1252 return FALSE;
1253 }
1254 /* Check that prev arena is free */
1255 if (!(pPrev->size & ARENA_FLAG_FREE) ||
1256 (pPrev->magic != ARENA_FREE_MAGIC))
1257 {
1258 ERR("Heap %p: prev arena %p invalid for in-use %p\n",
1259 subheap->heap, pPrev, pArena );
1260 return FALSE;
1261 }
1262 /* Check that prev arena is really the previous block */
1263 if ((const char *)(pPrev + 1) + (pPrev->size & ARENA_SIZE_MASK) != (const char *)pArena)
1264 {
1265 ERR("Heap %p: prev arena %p is not prev for in-use %p\n",
1266 subheap->heap, pPrev, pArena );
1267 return FALSE;
1268 }
1269 }
1270 /* Check unused size */
1271 if (pArena->unused_bytes > size)
1272 {
1273 ERR("Heap %p: invalid unused size %08x/%08lx\n", subheap->heap, pArena->unused_bytes, size );
1274 return FALSE;
1275 }
1276 /* Check unused bytes */
1277 if (pArena->magic == ARENA_PENDING_MAGIC)
1278 {
1279 const DWORD *ptr = (const DWORD *)(pArena + 1);
1280 const DWORD *end = (const DWORD *)((const char *)ptr + size);
1281
1282 while (ptr < end)
1283 {
1284 if (*ptr != ARENA_FREE_FILLER)
1285 {
1286 ERR("Heap %p: free block %p overwritten at %p by %08x\n",
1287 subheap->heap, (const ARENA_INUSE *)pArena + 1, ptr, *ptr );
1288 if (!*ptr) { HEAP_Dump( subheap->heap ); DbgBreakPoint(); }
1289 return FALSE;
1290 }
1291 ptr++;
1292 }
1293 }
1294 else if (flags & HEAP_TAIL_CHECKING_ENABLED)
1295 {
1296 const unsigned char *data = (const unsigned char *)(pArena + 1) + size - pArena->unused_bytes;
1297
1298 for (i = 0; i < pArena->unused_bytes; i++)
1299 {
1300 if (data[i] == ARENA_TAIL_FILLER) continue;
1301 ERR("Heap %p: block %p tail overwritten at %p (byte %u/%u == 0x%02x)\n",
1302 subheap->heap, pArena + 1, data + i, i, pArena->unused_bytes, data[i] );
1303 return FALSE;
1304 }
1305 }
1306 return TRUE;
1307 }
1308
1309
1310 /***********************************************************************
1311 * HEAP_IsRealArena [Internal]
1312 * Validates a block is a valid arena.
1313 *
1314 * RETURNS
1315 * TRUE: Success
1316 * FALSE: Failure
1317 */
1318 static BOOL HEAP_IsRealArena( HEAP *heapPtr, /* [in] ptr to the heap */
1319 DWORD flags, /* [in] Bit flags that control access during operation */
1320 LPCVOID block, /* [in] Optional pointer to memory block to validate */
1321 BOOL quiet ) /* [in] Flag - if true, HEAP_ValidateInUseArena
1322 * does not complain */
1323 {
1324 SUBHEAP *subheap;
1325 BOOL ret = TRUE;
1326 const ARENA_LARGE *large_arena;
1327
1328 flags &= HEAP_NO_SERIALIZE;
1329 flags |= heapPtr->flags;
1330 /* calling HeapLock may result in infinite recursion, so do the critsect directly */
1331 if (!(flags & HEAP_NO_SERIALIZE))
1332 RtlEnterCriticalSection( &heapPtr->critSection );
1333
1334 if (block) /* only check this single memory block */
1335 {
1336 const ARENA_INUSE *arena = (const ARENA_INUSE *)block - 1;
1337
1338 if (!(subheap = HEAP_FindSubHeap( heapPtr, arena )) ||
1339 ((const char *)arena < (char *)subheap->base + subheap->headerSize))
1340 {
1341 if (!(large_arena = find_large_block( heapPtr, block )))
1342 {
1343 if (quiet == NOISY)
1344 ERR("Heap %p: block %p is not inside heap\n", heapPtr, block );
1345 else if (WARN_ON(heap))
1346 WARN("Heap %p: block %p is not inside heap\n", heapPtr, block );
1347 ret = FALSE;
1348 }
1349 else
1350 ret = validate_large_arena( heapPtr, large_arena, quiet );
1351 } else
1352 ret = HEAP_ValidateInUseArena( subheap, arena, quiet );
1353
1354 if (!(flags & HEAP_NO_SERIALIZE))
1355 RtlLeaveCriticalSection( &heapPtr->critSection );
1356 return ret;
1357 }
1358
1359 LIST_FOR_EACH_ENTRY( subheap, &heapPtr->subheap_list, SUBHEAP, entry )
1360 {
1361 char *ptr = (char *)subheap->base + subheap->headerSize;
1362 while (ptr < (char *)subheap->base + subheap->size)
1363 {
1364 if (*(DWORD *)ptr & ARENA_FLAG_FREE)
1365 {
1366 if (!HEAP_ValidateFreeArena( subheap, (ARENA_FREE *)ptr )) {
1367 ret = FALSE;
1368 break;
1369 }
1370 ptr += sizeof(ARENA_FREE) + (*(DWORD *)ptr & ARENA_SIZE_MASK);
1371 }
1372 else
1373 {
1374 if (!HEAP_ValidateInUseArena( subheap, (ARENA_INUSE *)ptr, NOISY )) {
1375 ret = FALSE;
1376 break;
1377 }
1378 ptr += sizeof(ARENA_INUSE) + (*(DWORD *)ptr & ARENA_SIZE_MASK);
1379 }
1380 }
1381 if (!ret) break;
1382 }
1383
1384 LIST_FOR_EACH_ENTRY( large_arena, &heapPtr->large_list, ARENA_LARGE, entry )
1385 if (!(ret = validate_large_arena( heapPtr, large_arena, quiet ))) break;
1386
1387 if (!(flags & HEAP_NO_SERIALIZE)) RtlLeaveCriticalSection( &heapPtr->critSection );
1388 return ret;
1389 }
1390
1391
1392 /***********************************************************************
1393 * validate_block_pointer
1394 *
1395 * Minimum validation needed to catch bad parameters in heap functions.
1396 */
1397 static BOOL validate_block_pointer( HEAP *heap, SUBHEAP **ret_subheap, const ARENA_INUSE *arena )
1398 {
1399 SUBHEAP *subheap;
1400 BOOL ret = FALSE;
1401
1402 if (!(*ret_subheap = subheap = HEAP_FindSubHeap( heap, arena )))
1403 {
1404 ARENA_LARGE *large_arena = find_large_block( heap, arena + 1 );
1405
1406 if (!large_arena)
1407 {
1408 WARN( "Heap %p: pointer %p is not inside heap\n", heap, arena + 1 );
1409 return FALSE;
1410 }
1411 if ((heap->flags & HEAP_VALIDATE) && !validate_large_arena( heap, large_arena, QUIET ))
1412 return FALSE;
1413 return TRUE;
1414 }
1415
1416 if ((const char *)arena < (char *)subheap->base + subheap->headerSize)
1417 WARN( "Heap %p: pointer %p is inside subheap %p header\n", subheap->heap, arena + 1, subheap );
1418 else if (subheap->heap->flags & HEAP_VALIDATE) /* do the full validation */
1419 ret = HEAP_ValidateInUseArena( subheap, arena, QUIET );
1420 else if ((ULONG_PTR)arena % ALIGNMENT != ARENA_OFFSET)
1421 WARN( "Heap %p: unaligned arena pointer %p\n", subheap->heap, arena );
1422 else if (arena->magic == ARENA_PENDING_MAGIC)
1423 WARN( "Heap %p: block %p used after free\n", subheap->heap, arena + 1 );
1424 else if (arena->magic != ARENA_INUSE_MAGIC)
1425 WARN( "Heap %p: invalid in-use arena magic %08x for %p\n", subheap->heap, arena->magic, arena );
1426 else if (arena->size & ARENA_FLAG_FREE)
1427 ERR( "Heap %p: bad flags %08x for in-use arena %p\n",
1428 subheap->heap, arena->size & ~ARENA_SIZE_MASK, arena );
1429 else if ((const char *)(arena + 1) + (arena->size & ARENA_SIZE_MASK) > (const char *)subheap->base + subheap->size ||
1430 (const char *)(arena + 1) + (arena->size & ARENA_SIZE_MASK) < (const char *)(arena + 1))
1431 ERR( "Heap %p: bad size %08x for in-use arena %p\n",
1432 subheap->heap, arena->size & ARENA_SIZE_MASK, arena );
1433 else
1434 ret = TRUE;
1435
1436 return ret;
1437 }
1438
1439
1440 /***********************************************************************
1441 * heap_set_debug_flags
1442 */
1443 void heap_set_debug_flags( HANDLE handle )
1444 {
1445 HEAP *heap = HEAP_GetPtr( handle );
1446 ULONG global_flags = RtlGetNtGlobalFlags();
1447 ULONG flags = 0;
1448
1449 if (TRACE_ON(heap)) global_flags |= FLG_HEAP_VALIDATE_ALL;
1450 if (WARN_ON(heap)) global_flags |= FLG_HEAP_VALIDATE_PARAMETERS;
1451
1452 if (global_flags & FLG_HEAP_ENABLE_TAIL_CHECK) flags |= HEAP_TAIL_CHECKING_ENABLED;
1453 if (global_flags & FLG_HEAP_ENABLE_FREE_CHECK) flags |= HEAP_FREE_CHECKING_ENABLED;
1454 if (global_flags & FLG_HEAP_DISABLE_COALESCING) flags |= HEAP_DISABLE_COALESCE_ON_FREE;
1455 if (global_flags & FLG_HEAP_PAGE_ALLOCS) flags |= HEAP_PAGE_ALLOCS | HEAP_GROWABLE;
1456
1457 if (global_flags & FLG_HEAP_VALIDATE_PARAMETERS)
1458 flags |= HEAP_VALIDATE | HEAP_VALIDATE_PARAMS |
1459 HEAP_TAIL_CHECKING_ENABLED | HEAP_FREE_CHECKING_ENABLED;
1460 if (global_flags & FLG_HEAP_VALIDATE_ALL)
1461 flags |= HEAP_VALIDATE | HEAP_VALIDATE_ALL |
1462 HEAP_TAIL_CHECKING_ENABLED | HEAP_FREE_CHECKING_ENABLED;
1463
1464 if (RUNNING_ON_VALGRIND) flags = 0; /* no sense in validating since Valgrind catches accesses */
1465
1466 heap->flags |= flags;
1467 heap->force_flags |= flags & ~(HEAP_VALIDATE | HEAP_DISABLE_COALESCE_ON_FREE);
1468
1469 if (flags & (HEAP_FREE_CHECKING_ENABLED | HEAP_TAIL_CHECKING_ENABLED)) /* fix existing blocks */
1470 {
1471 SUBHEAP *subheap;
1472 ARENA_LARGE *large;
1473
1474 LIST_FOR_EACH_ENTRY( subheap, &heap->subheap_list, SUBHEAP, entry )
1475 {
1476 char *ptr = (char *)subheap->base + subheap->headerSize;
1477 char *end = (char *)subheap->base + subheap->commitSize;
1478 while (ptr < end)
1479 {
1480 ARENA_INUSE *arena = (ARENA_INUSE *)ptr;
1481 SIZE_T size = arena->size & ARENA_SIZE_MASK;
1482 if (arena->size & ARENA_FLAG_FREE)
1483 {
1484 SIZE_T count = size;
1485
1486 ptr += sizeof(ARENA_FREE) + size;
1487 if (ptr >= end) count = end - (char *)((ARENA_FREE *)arena + 1);
1488 else count -= sizeof(ARENA_FREE *);
1489 mark_block_free( (ARENA_FREE *)arena + 1, count, flags );
1490 }
1491 else
1492 {
1493 if (arena->magic == ARENA_PENDING_MAGIC)
1494 mark_block_free( arena + 1, size, flags );
1495 else
1496 mark_block_tail( (char *)(arena + 1) + size - arena->unused_bytes,
1497 arena->unused_bytes, flags );
1498 ptr += sizeof(ARENA_INUSE) + size;
1499 }
1500 }
1501 }
1502
1503 LIST_FOR_EACH_ENTRY( large, &heap->large_list, ARENA_LARGE, entry )
1504 mark_block_tail( (char *)(large + 1) + large->data_size,
1505 large->block_size - sizeof(*large) - large->data_size, flags );
1506 }
1507
1508 if ((heap->flags & HEAP_GROWABLE) && !heap->pending_free &&
1509 ((flags & HEAP_FREE_CHECKING_ENABLED) || RUNNING_ON_VALGRIND))
1510 {
1511 void *ptr = NULL;
1512 SIZE_T size = MAX_FREE_PENDING * sizeof(*heap->pending_free);
1513
1514 if (!NtAllocateVirtualMemory( NtCurrentProcess(), &ptr, 4, &size, MEM_COMMIT, PAGE_READWRITE ))
1515 {
1516 heap->pending_free = ptr;
1517 heap->pending_pos = 0;
1518 }
1519 }
1520 }
1521
1522
1523 /***********************************************************************
1524 * RtlCreateHeap (NTDLL.@)
1525 *
1526 * Create a new Heap.
1527 *
1528 * PARAMS
1529 * flags [I] HEAP_ flags from "winnt.h"
1530 * addr [I] Desired base address
1531 * totalSize [I] Total size of the heap, or 0 for a growable heap
1532 * commitSize [I] Amount of heap space to commit
1533 * unknown [I] Not yet understood
1534 * definition [I] Heap definition
1535 *
1536 * RETURNS
1537 * Success: A HANDLE to the newly created heap.
1538 * Failure: a NULL HANDLE.
1539 */
1540 HANDLE WINAPI RtlCreateHeap( ULONG flags, PVOID addr, SIZE_T totalSize, SIZE_T commitSize,
1541 PVOID unknown, PRTL_HEAP_DEFINITION definition )
1542 {
1543 SUBHEAP *subheap;
1544
1545 /* Allocate the heap block */
1546
1547 if (!totalSize)
1548 {
1549 totalSize = HEAP_DEF_SIZE;
1550 flags |= HEAP_GROWABLE;
1551 }
1552
1553 if (!(subheap = HEAP_CreateSubHeap( NULL, addr, flags, commitSize, totalSize ))) return 0;
1554
1555 heap_set_debug_flags( subheap->heap );
1556
1557 /* link it into the per-process heap list */
1558 if (processHeap)
1559 {
1560 HEAP *heapPtr = subheap->heap;
1561 RtlEnterCriticalSection( &processHeap->critSection );
1562 list_add_head( &processHeap->entry, &heapPtr->entry );
1563 RtlLeaveCriticalSection( &processHeap->critSection );
1564 }
1565 else if (!addr)
1566 {
1567 processHeap = subheap->heap; /* assume the first heap we create is the process main heap */
1568 list_init( &processHeap->entry );
1569 }
1570
1571 return subheap->heap;
1572 }
1573
1574
1575 /***********************************************************************
1576 * RtlDestroyHeap (NTDLL.@)
1577 *
1578 * Destroy a Heap created with RtlCreateHeap().
1579 *
1580 * PARAMS
1581 * heap [I] Heap to destroy.
1582 *
1583 * RETURNS
1584 * Success: A NULL HANDLE, if heap is NULL or it was destroyed
1585 * Failure: The Heap handle, if heap is the process heap.
1586 */
1587 HANDLE WINAPI RtlDestroyHeap( HANDLE heap )
1588 {
1589 HEAP *heapPtr = HEAP_GetPtr( heap );
1590 SUBHEAP *subheap, *next;
1591 ARENA_LARGE *arena, *arena_next;
1592 SIZE_T size;
1593 void *addr;
1594
1595 TRACE("%p\n", heap );
1596 if (!heapPtr) return heap;
1597
1598 if (heap == processHeap) return heap; /* cannot delete the main process heap */
1599
1600 /* remove it from the per-process list */
1601 RtlEnterCriticalSection( &processHeap->critSection );
1602 list_remove( &heapPtr->entry );
1603 RtlLeaveCriticalSection( &processHeap->critSection );
1604
1605 heapPtr->critSection.DebugInfo->Spare[0] = 0;
1606 RtlDeleteCriticalSection( &heapPtr->critSection );
1607
1608 LIST_FOR_EACH_ENTRY_SAFE( arena, arena_next, &heapPtr->large_list, ARENA_LARGE, entry )
1609 {
1610 list_remove( &arena->entry );
1611 size = 0;
1612 addr = arena;
1613 NtFreeVirtualMemory( NtCurrentProcess(), &addr, &size, MEM_RELEASE );
1614 }
1615 LIST_FOR_EACH_ENTRY_SAFE( subheap, next, &heapPtr->subheap_list, SUBHEAP, entry )
1616 {
1617 if (subheap == &heapPtr->subheap) continue; /* do this one last */
1618 subheap_notify_free_all(subheap);
1619 list_remove( &subheap->entry );
1620 size = 0;
1621 addr = subheap->base;
1622 NtFreeVirtualMemory( NtCurrentProcess(), &addr, &size, MEM_RELEASE );
1623 }
1624 subheap_notify_free_all(&heapPtr->subheap);
1625 if (heapPtr->pending_free)
1626 {
1627 size = 0;
1628 addr = heapPtr->pending_free;
1629 NtFreeVirtualMemory( NtCurrentProcess(), &addr, &size, MEM_RELEASE );
1630 }
1631 size = 0;
1632 addr = heapPtr->subheap.base;
1633 NtFreeVirtualMemory( NtCurrentProcess(), &addr, &size, MEM_RELEASE );
1634 return 0;
1635 }
1636
1637
1638 /***********************************************************************
1639 * RtlAllocateHeap (NTDLL.@)
1640 *
1641 * Allocate a memory block from a Heap.
1642 *
1643 * PARAMS
1644 * heap [I] Heap to allocate block from
1645 * flags [I] HEAP_ flags from "winnt.h"
1646 * size [I] Size of the memory block to allocate
1647 *
1648 * RETURNS
1649 * Success: A pointer to the newly allocated block
1650 * Failure: NULL.
1651 *
1652 * NOTES
1653 * This call does not SetLastError().
1654 */
1655 PVOID WINAPI RtlAllocateHeap( HANDLE heap, ULONG flags, SIZE_T size )
1656 {
1657 ARENA_FREE *pArena;
1658 ARENA_INUSE *pInUse;
1659 SUBHEAP *subheap;
1660 HEAP *heapPtr = HEAP_GetPtr( heap );
1661 SIZE_T rounded_size;
1662
1663 /* Validate the parameters */
1664
1665 if (!heapPtr) return NULL;
1666 flags &= HEAP_GENERATE_EXCEPTIONS | HEAP_NO_SERIALIZE | HEAP_ZERO_MEMORY;
1667 flags |= heapPtr->flags;
1668 rounded_size = ROUND_SIZE(size) + HEAP_TAIL_EXTRA_SIZE( flags );
1669 if (rounded_size < size) /* overflow */
1670 {
1671 if (flags & HEAP_GENERATE_EXCEPTIONS) RtlRaiseStatus( STATUS_NO_MEMORY );
1672 return NULL;
1673 }
1674 if (rounded_size < HEAP_MIN_DATA_SIZE) rounded_size = HEAP_MIN_DATA_SIZE;
1675
1676 if (!(flags & HEAP_NO_SERIALIZE)) RtlEnterCriticalSection( &heapPtr->critSection );
1677
1678 if (rounded_size >= HEAP_MIN_LARGE_BLOCK_SIZE && (flags & HEAP_GROWABLE))
1679 {
1680 void *ret = allocate_large_block( heap, flags, size );
1681 if (!(flags & HEAP_NO_SERIALIZE)) RtlLeaveCriticalSection( &heapPtr->critSection );
1682 if (!ret && (flags & HEAP_GENERATE_EXCEPTIONS)) RtlRaiseStatus( STATUS_NO_MEMORY );
1683 TRACE("(%p,%08x,%08lx): returning %p\n", heap, flags, size, ret );
1684 return ret;
1685 }
1686
1687 /* Locate a suitable free block */
1688
1689 if (!(pArena = HEAP_FindFreeBlock( heapPtr, rounded_size, &subheap )))
1690 {
1691 TRACE("(%p,%08x,%08lx): returning NULL\n",
1692 heap, flags, size );
1693 if (!(flags & HEAP_NO_SERIALIZE)) RtlLeaveCriticalSection( &heapPtr->critSection );
1694 if (flags & HEAP_GENERATE_EXCEPTIONS) RtlRaiseStatus( STATUS_NO_MEMORY );
1695 return NULL;
1696 }
1697
1698 /* Remove the arena from the free list */
1699
1700 list_remove( &pArena->entry );
1701
1702 /* Build the in-use arena */
1703
1704 pInUse = (ARENA_INUSE *)pArena;
1705
1706 /* in-use arena is smaller than free arena,
1707 * so we have to add the difference to the size */
1708 pInUse->size = (pInUse->size & ~ARENA_FLAG_FREE) + sizeof(ARENA_FREE) - sizeof(ARENA_INUSE);
1709 pInUse->magic = ARENA_INUSE_MAGIC;
1710
1711 /* Shrink the block */
1712
1713 HEAP_ShrinkBlock( subheap, pInUse, rounded_size );
1714 pInUse->unused_bytes = (pInUse->size & ARENA_SIZE_MASK) - size;
1715
1716 notify_alloc( pInUse + 1, size, flags & HEAP_ZERO_MEMORY );
1717 initialize_block( pInUse + 1, size, pInUse->unused_bytes, flags );
1718
1719 if (!(flags & HEAP_NO_SERIALIZE)) RtlLeaveCriticalSection( &heapPtr->critSection );
1720
1721 TRACE("(%p,%08x,%08lx): returning %p\n", heap, flags, size, pInUse + 1 );
1722 return pInUse + 1;
1723 }
1724
1725
1726 /***********************************************************************
1727 * RtlFreeHeap (NTDLL.@)
1728 *
1729 * Free a memory block allocated with RtlAllocateHeap().
1730 *
1731 * PARAMS
1732 * heap [I] Heap that block was allocated from
1733 * flags [I] HEAP_ flags from "winnt.h"
1734 * ptr [I] Block to free
1735 *
1736 * RETURNS
1737 * Success: TRUE, if ptr is NULL or was freed successfully.
1738 * Failure: FALSE.
1739 */
1740 BOOLEAN WINAPI RtlFreeHeap( HANDLE heap, ULONG flags, PVOID ptr )
1741 {
1742 ARENA_INUSE *pInUse;
1743 SUBHEAP *subheap;
1744 HEAP *heapPtr;
1745
1746 /* Validate the parameters */
1747
1748 if (!ptr) return TRUE; /* freeing a NULL ptr isn't an error in Win2k */
1749
1750 heapPtr = HEAP_GetPtr( heap );
1751 if (!heapPtr)
1752 {
1753 RtlSetLastWin32ErrorAndNtStatusFromNtStatus( STATUS_INVALID_HANDLE );
1754 return FALSE;
1755 }
1756
1757 flags &= HEAP_NO_SERIALIZE;
1758 flags |= heapPtr->flags;
1759 if (!(flags & HEAP_NO_SERIALIZE)) RtlEnterCriticalSection( &heapPtr->critSection );
1760
1761 /* Inform valgrind we are trying to free memory, so it can throw up an error message */
1762 notify_free( ptr );
1763
1764 /* Some sanity checks */
1765 pInUse = (ARENA_INUSE *)ptr - 1;
1766 if (!validate_block_pointer( heapPtr, &subheap, pInUse )) goto error;
1767
1768 if (!subheap)
1769 free_large_block( heapPtr, flags, ptr );
1770 else
1771 HEAP_MakeInUseBlockFree( subheap, pInUse );
1772
1773 if (!(flags & HEAP_NO_SERIALIZE)) RtlLeaveCriticalSection( &heapPtr->critSection );
1774 TRACE("(%p,%08x,%p): returning TRUE\n", heap, flags, ptr );
1775 return TRUE;
1776
1777 error:
1778 if (!(flags & HEAP_NO_SERIALIZE)) RtlLeaveCriticalSection( &heapPtr->critSection );
1779 RtlSetLastWin32ErrorAndNtStatusFromNtStatus( STATUS_INVALID_PARAMETER );
1780 TRACE("(%p,%08x,%p): returning FALSE\n", heap, flags, ptr );
1781 return FALSE;
1782 }
1783
1784
1785 /***********************************************************************
1786 * RtlReAllocateHeap (NTDLL.@)
1787 *
1788 * Change the size of a memory block allocated with RtlAllocateHeap().
1789 *
1790 * PARAMS
1791 * heap [I] Heap that block was allocated from
1792 * flags [I] HEAP_ flags from "winnt.h"
1793 * ptr [I] Block to resize
1794 * size [I] Size of the memory block to allocate
1795 *
1796 * RETURNS
1797 * Success: A pointer to the resized block (which may be different).
1798 * Failure: NULL.
1799 */
1800 PVOID WINAPI RtlReAllocateHeap( HANDLE heap, ULONG flags, PVOID ptr, SIZE_T size )
1801 {
1802 ARENA_INUSE *pArena;
1803 HEAP *heapPtr;
1804 SUBHEAP *subheap;
1805 SIZE_T oldBlockSize, oldActualSize, rounded_size;
1806 void *ret;
1807
1808 if (!ptr) return NULL;
1809 if (!(heapPtr = HEAP_GetPtr( heap )))
1810 {
1811 RtlSetLastWin32ErrorAndNtStatusFromNtStatus( STATUS_INVALID_HANDLE );
1812 return NULL;
1813 }
1814
1815 /* Validate the parameters */
1816
1817 flags &= HEAP_GENERATE_EXCEPTIONS | HEAP_NO_SERIALIZE | HEAP_ZERO_MEMORY |
1818 HEAP_REALLOC_IN_PLACE_ONLY;
1819 flags |= heapPtr->flags;
1820 if (!(flags & HEAP_NO_SERIALIZE)) RtlEnterCriticalSection( &heapPtr->critSection );
1821
1822 rounded_size = ROUND_SIZE(size) + HEAP_TAIL_EXTRA_SIZE(flags);
1823 if (rounded_size < size) goto oom; /* overflow */
1824 if (rounded_size < HEAP_MIN_DATA_SIZE) rounded_size = HEAP_MIN_DATA_SIZE;
1825
1826 pArena = (ARENA_INUSE *)ptr - 1;
1827 if (!validate_block_pointer( heapPtr, &subheap, pArena )) goto error;
1828 if (!subheap)
1829 {
1830 if (!(ret = realloc_large_block( heapPtr, flags, ptr, size ))) goto oom;
1831 goto done;
1832 }
1833
1834 /* Check if we need to grow the block */
1835
1836 oldBlockSize = (pArena->size & ARENA_SIZE_MASK);
1837 oldActualSize = (pArena->size & ARENA_SIZE_MASK) - pArena->unused_bytes;
1838 if (rounded_size > oldBlockSize)
1839 {
1840 char *pNext = (char *)(pArena + 1) + oldBlockSize;
1841
1842 if (rounded_size >= HEAP_MIN_LARGE_BLOCK_SIZE && (flags & HEAP_GROWABLE))
1843 {
1844 if (flags & HEAP_REALLOC_IN_PLACE_ONLY) goto oom;
1845 if (!(ret = allocate_large_block( heapPtr, flags, size ))) goto oom;
1846 memcpy( ret, pArena + 1, oldActualSize );
1847 notify_free( pArena + 1 );
1848 HEAP_MakeInUseBlockFree( subheap, pArena );
1849 goto done;
1850 }
1851 if ((pNext < (char *)subheap->base + subheap->size) &&
1852 (*(DWORD *)pNext & ARENA_FLAG_FREE) &&
1853 (oldBlockSize + (*(DWORD *)pNext & ARENA_SIZE_MASK) + sizeof(ARENA_FREE) >= rounded_size))
1854 {
1855 /* The next block is free and large enough */
1856 ARENA_FREE *pFree = (ARENA_FREE *)pNext;
1857 list_remove( &pFree->entry );
1858 pArena->size += (pFree->size & ARENA_SIZE_MASK) + sizeof(*pFree);
1859 if (!HEAP_Commit( subheap, pArena, rounded_size )) goto oom;
1860 notify_realloc( pArena + 1, oldActualSize, size );
1861 HEAP_ShrinkBlock( subheap, pArena, rounded_size );
1862 }
1863 else /* Do it the hard way */
1864 {
1865 ARENA_FREE *pNew;
1866 ARENA_INUSE *pInUse;
1867 SUBHEAP *newsubheap;
1868
1869 if ((flags & HEAP_REALLOC_IN_PLACE_ONLY) ||
1870 !(pNew = HEAP_FindFreeBlock( heapPtr, rounded_size, &newsubheap )))
1871 goto oom;
1872
1873 /* Build the in-use arena */
1874
1875 list_remove( &pNew->entry );
1876 pInUse = (ARENA_INUSE *)pNew;
1877 pInUse->size = (pInUse->size & ~ARENA_FLAG_FREE)
1878 + sizeof(ARENA_FREE) - sizeof(ARENA_INUSE);
1879 pInUse->magic = ARENA_INUSE_MAGIC;
1880 HEAP_ShrinkBlock( newsubheap, pInUse, rounded_size );
1881
1882 mark_block_initialized( pInUse + 1, oldActualSize );
1883 notify_alloc( pInUse + 1, size, FALSE );
1884 memcpy( pInUse + 1, pArena + 1, oldActualSize );
1885
1886 /* Free the previous block */
1887
1888 notify_free( pArena + 1 );
1889 HEAP_MakeInUseBlockFree( subheap, pArena );
1890 subheap = newsubheap;
1891 pArena = pInUse;
1892 }
1893 }
1894 else
1895 {
1896 notify_realloc( pArena + 1, oldActualSize, size );
1897 HEAP_ShrinkBlock( subheap, pArena, rounded_size );
1898 }
1899
1900 pArena->unused_bytes = (pArena->size & ARENA_SIZE_MASK) - size;
1901
1902 /* Clear the extra bytes if needed */
1903
1904 if (size > oldActualSize)
1905 initialize_block( (char *)(pArena + 1) + oldActualSize, size - oldActualSize,
1906 pArena->unused_bytes, flags );
1907 else
1908 mark_block_tail( (char *)(pArena + 1) + size, pArena->unused_bytes, flags );
1909
1910 /* Return the new arena */
1911
1912 ret = pArena + 1;
1913 done:
1914 if (!(flags & HEAP_NO_SERIALIZE)) RtlLeaveCriticalSection( &heapPtr->critSection );
1915 TRACE("(%p,%08x,%p,%08lx): returning %p\n", heap, flags, ptr, size, ret );
1916 return ret;
1917
1918 oom:
1919 if (!(flags & HEAP_NO_SERIALIZE)) RtlLeaveCriticalSection( &heapPtr->critSection );
1920 if (flags & HEAP_GENERATE_EXCEPTIONS) RtlRaiseStatus( STATUS_NO_MEMORY );
1921 RtlSetLastWin32ErrorAndNtStatusFromNtStatus( STATUS_NO_MEMORY );
1922 TRACE("(%p,%08x,%p,%08lx): returning NULL\n", heap, flags, ptr, size );
1923 return NULL;
1924
1925 error:
1926 if (!(flags & HEAP_NO_SERIALIZE)) RtlLeaveCriticalSection( &heapPtr->critSection );
1927 RtlSetLastWin32ErrorAndNtStatusFromNtStatus( STATUS_INVALID_PARAMETER );
1928 TRACE("(%p,%08x,%p,%08lx): returning NULL\n", heap, flags, ptr, size );
1929 return NULL;
1930 }
1931
1932
1933 /***********************************************************************
1934 * RtlCompactHeap (NTDLL.@)
1935 *
1936 * Compact the free space in a Heap.
1937 *
1938 * PARAMS
1939 * heap [I] Heap that block was allocated from
1940 * flags [I] HEAP_ flags from "winnt.h"
1941 *
1942 * RETURNS
1943 * The number of bytes compacted.
1944 *
1945 * NOTES
1946 * This function is a harmless stub.
1947 */
1948 ULONG WINAPI RtlCompactHeap( HANDLE heap, ULONG flags )
1949 {
1950 static BOOL reported;
1951 if (!reported++) FIXME( "(%p, 0x%x) stub\n", heap, flags );
1952 return 0;
1953 }
1954
1955
1956 /***********************************************************************
1957 * RtlLockHeap (NTDLL.@)
1958 *
1959 * Lock a Heap.
1960 *
1961 * PARAMS
1962 * heap [I] Heap to lock
1963 *
1964 * RETURNS
1965 * Success: TRUE. The Heap is locked.
1966 * Failure: FALSE, if heap is invalid.
1967 */
1968 BOOLEAN WINAPI RtlLockHeap( HANDLE heap )
1969 {
1970 HEAP *heapPtr = HEAP_GetPtr( heap );
1971 if (!heapPtr) return FALSE;
1972 RtlEnterCriticalSection( &heapPtr->critSection );
1973 return TRUE;
1974 }
1975
1976
1977 /***********************************************************************
1978 * RtlUnlockHeap (NTDLL.@)
1979 *
1980 * Unlock a Heap.
1981 *
1982 * PARAMS
1983 * heap [I] Heap to unlock
1984 *
1985 * RETURNS
1986 * Success: TRUE. The Heap is unlocked.
1987 * Failure: FALSE, if heap is invalid.
1988 */
1989 BOOLEAN WINAPI RtlUnlockHeap( HANDLE heap )
1990 {
1991 HEAP *heapPtr = HEAP_GetPtr( heap );
1992 if (!heapPtr) return FALSE;
1993 RtlLeaveCriticalSection( &heapPtr->critSection );
1994 return TRUE;
1995 }
1996
1997
1998 /***********************************************************************
1999 * RtlSizeHeap (NTDLL.@)
2000 *
2001 * Get the actual size of a memory block allocated from a Heap.
2002 *
2003 * PARAMS
2004 * heap [I] Heap that block was allocated from
2005 * flags [I] HEAP_ flags from "winnt.h"
2006 * ptr [I] Block to get the size of
2007 *
2008 * RETURNS
2009 * Success: The size of the block.
2010 * Failure: -1, heap or ptr are invalid.
2011 *
2012 * NOTES
2013 * The size may be bigger than what was passed to RtlAllocateHeap().
2014 */
2015 SIZE_T WINAPI RtlSizeHeap( HANDLE heap, ULONG flags, const void *ptr )
2016 {
2017 SIZE_T ret;
2018 const ARENA_INUSE *pArena;
2019 SUBHEAP *subheap;
2020 HEAP *heapPtr = HEAP_GetPtr( heap );
2021
2022 if (!heapPtr)
2023 {
2024 RtlSetLastWin32ErrorAndNtStatusFromNtStatus( STATUS_INVALID_HANDLE );
2025 return ~0UL;
2026 }
2027 flags &= HEAP_NO_SERIALIZE;
2028 flags |= heapPtr->flags;
2029 if (!(flags & HEAP_NO_SERIALIZE)) RtlEnterCriticalSection( &heapPtr->critSection );
2030
2031 pArena = (const ARENA_INUSE *)ptr - 1;
2032 if (!validate_block_pointer( heapPtr, &subheap, pArena ))
2033 {
2034 RtlSetLastWin32ErrorAndNtStatusFromNtStatus( STATUS_INVALID_PARAMETER );
2035 ret = ~0UL;
2036 }
2037 else if (!subheap)
2038 {
2039 const ARENA_LARGE *large_arena = (const ARENA_LARGE *)ptr - 1;
2040 ret = large_arena->data_size;
2041 }
2042 else
2043 {
2044 ret = (pArena->size & ARENA_SIZE_MASK) - pArena->unused_bytes;
2045 }
2046 if (!(flags & HEAP_NO_SERIALIZE)) RtlLeaveCriticalSection( &heapPtr->critSection );
2047
2048 TRACE("(%p,%08x,%p): returning %08lx\n", heap, flags, ptr, ret );
2049 return ret;
2050 }
2051
2052
2053 /***********************************************************************
2054 * RtlValidateHeap (NTDLL.@)
2055 *
2056 * Determine if a block is a valid allocation from a heap.
2057 *
2058 * PARAMS
2059 * heap [I] Heap that block was allocated from
2060 * flags [I] HEAP_ flags from "winnt.h"
2061 * ptr [I] Block to check
2062 *
2063 * RETURNS
2064 * Success: TRUE. The block was allocated from heap.
2065 * Failure: FALSE, if heap is invalid or ptr was not allocated from it.
2066 */
2067 BOOLEAN WINAPI RtlValidateHeap( HANDLE heap, ULONG flags, LPCVOID ptr )
2068 {
2069 HEAP *heapPtr = HEAP_GetPtr( heap );
2070 if (!heapPtr) return FALSE;
2071 return HEAP_IsRealArena( heapPtr, flags, ptr, QUIET );
2072 }
2073
2074
2075 /***********************************************************************
2076 * RtlWalkHeap (NTDLL.@)
2077 *
2078 * FIXME
2079 * The PROCESS_HEAP_ENTRY flag values seem different between this
2080 * function and HeapWalk(). To be checked.
2081 */
2082 NTSTATUS WINAPI RtlWalkHeap( HANDLE heap, PVOID entry_ptr )
2083 {
2084 LPPROCESS_HEAP_ENTRY entry = entry_ptr; /* FIXME */
2085 HEAP *heapPtr = HEAP_GetPtr(heap);
2086 SUBHEAP *sub, *currentheap = NULL;
2087 NTSTATUS ret;
2088 char *ptr;
2089 int region_index = 0;
2090
2091 if (!heapPtr || !entry) return STATUS_INVALID_PARAMETER;
2092
2093 if (!(heapPtr->flags & HEAP_NO_SERIALIZE)) RtlEnterCriticalSection( &heapPtr->critSection );
2094
2095 /* FIXME: enumerate large blocks too */
2096
2097 /* set ptr to the next arena to be examined */
2098
2099 if (!entry->lpData) /* first call (init) ? */
2100 {
2101 TRACE("begin walking of heap %p.\n", heap);
2102 currentheap = &heapPtr->subheap;
2103 ptr = (char*)currentheap->base + currentheap->headerSize;
2104 }
2105 else
2106 {
2107 ptr = entry->lpData;
2108 LIST_FOR_EACH_ENTRY( sub, &heapPtr->subheap_list, SUBHEAP, entry )
2109 {
2110 if ((ptr >= (char *)sub->base) &&
2111 (ptr < (char *)sub->base + sub->size))
2112 {
2113 currentheap = sub;
2114 break;
2115 }
2116 region_index++;
2117 }
2118 if (currentheap == NULL)
2119 {
2120 ERR("no matching subheap found, shouldn't happen !\n");
2121 ret = STATUS_NO_MORE_ENTRIES;
2122 goto HW_end;
2123 }
2124
2125 if (((ARENA_INUSE *)ptr - 1)->magic == ARENA_INUSE_MAGIC ||
2126 ((ARENA_INUSE *)ptr - 1)->magic == ARENA_PENDING_MAGIC)
2127 {
2128 ARENA_INUSE *pArena = (ARENA_INUSE *)ptr - 1;
2129 ptr += pArena->size & ARENA_SIZE_MASK;
2130 }
2131 else if (((ARENA_FREE *)ptr - 1)->magic == ARENA_FREE_MAGIC)
2132 {
2133 ARENA_FREE *pArena = (ARENA_FREE *)ptr - 1;
2134 ptr += pArena->size & ARENA_SIZE_MASK;
2135 }
2136 else
2137 ptr += entry->cbData; /* point to next arena */
2138
2139 if (ptr > (char *)currentheap->base + currentheap->size - 1)
2140 { /* proceed with next subheap */
2141 struct list *next = list_next( &heapPtr->subheap_list, &currentheap->entry );
2142 if (!next)
2143 { /* successfully finished */
2144 TRACE("end reached.\n");
2145 ret = STATUS_NO_MORE_ENTRIES;
2146 goto HW_end;
2147 }
2148 currentheap = LIST_ENTRY( next, SUBHEAP, entry );
2149 ptr = (char *)currentheap->base + currentheap->headerSize;
2150 }
2151 }
2152
2153 entry->wFlags = 0;
2154 if (*(DWORD *)ptr & ARENA_FLAG_FREE)
2155 {
2156 ARENA_FREE *pArena = (ARENA_FREE *)ptr;
2157
2158 /*TRACE("free, magic: %04x\n", pArena->magic);*/
2159
2160 entry->lpData = pArena + 1;
2161 entry->cbData = pArena->size & ARENA_SIZE_MASK;
2162 entry->cbOverhead = sizeof(ARENA_FREE);
2163 entry->wFlags = PROCESS_HEAP_UNCOMMITTED_RANGE;
2164 }
2165 else
2166 {
2167 ARENA_INUSE *pArena = (ARENA_INUSE *)ptr;
2168
2169 /*TRACE("busy, magic: %04x\n", pArena->magic);*/
2170
2171 entry->lpData = pArena + 1;
2172 entry->cbData = pArena->size & ARENA_SIZE_MASK;
2173 entry->cbOverhead = sizeof(ARENA_INUSE);
2174 entry->wFlags = (pArena->magic == ARENA_PENDING_MAGIC) ?
2175 PROCESS_HEAP_UNCOMMITTED_RANGE : PROCESS_HEAP_ENTRY_BUSY;
2176 /* FIXME: can't handle PROCESS_HEAP_ENTRY_MOVEABLE
2177 and PROCESS_HEAP_ENTRY_DDESHARE yet */
2178 }
2179
2180 entry->iRegionIndex = region_index;
2181
2182 /* first element of heap ? */
2183 if (ptr == (char *)currentheap->base + currentheap->headerSize)
2184 {
2185 entry->wFlags |= PROCESS_HEAP_REGION;
2186 entry->u.Region.dwCommittedSize = currentheap->commitSize;
2187 entry->u.Region.dwUnCommittedSize =
2188 currentheap->size - currentheap->commitSize;
2189 entry->u.Region.lpFirstBlock = /* first valid block */
2190 (char *)currentheap->base + currentheap->headerSize;
2191 entry->u.Region.lpLastBlock = /* first invalid block */
2192 (char *)currentheap->base + currentheap->size;
2193 }
2194 ret = STATUS_SUCCESS;
2195 if (TRACE_ON(heap)) HEAP_DumpEntry(entry);
2196
2197 HW_end:
2198 if (!(heapPtr->flags & HEAP_NO_SERIALIZE)) RtlLeaveCriticalSection( &heapPtr->critSection );
2199 return ret;
2200 }
2201
2202
2203 /***********************************************************************
2204 * RtlGetProcessHeaps (NTDLL.@)
2205 *
2206 * Get the Heaps belonging to the current process.
2207 *
2208 * PARAMS
2209 * count [I] size of heaps
2210 * heaps [O] Destination array for heap HANDLE's
2211 *
2212 * RETURNS
2213 * Success: The number of Heaps allocated by the process.
2214 * Failure: 0.
2215 */
2216 ULONG WINAPI RtlGetProcessHeaps( ULONG count, HANDLE *heaps )
2217 {
2218 ULONG total = 1; /* main heap */
2219 struct list *ptr;
2220
2221 RtlEnterCriticalSection( &processHeap->critSection );
2222 LIST_FOR_EACH( ptr, &processHeap->entry ) total++;
2223 if (total <= count)
2224 {
2225 *heaps++ = processHeap;
2226 LIST_FOR_EACH( ptr, &processHeap->entry )
2227 *heaps++ = LIST_ENTRY( ptr, HEAP, entry );
2228 }
2229 RtlLeaveCriticalSection( &processHeap->critSection );
2230 return total;
2231 }
2232
2233 /***********************************************************************
2234 * RtlQueryHeapInformation (NTDLL.@)
2235 */
2236 NTSTATUS WINAPI RtlQueryHeapInformation( HANDLE heap, HEAP_INFORMATION_CLASS info_class,
2237 PVOID info, SIZE_T size_in, PSIZE_T size_out)
2238 {
2239 switch (info_class)
2240 {
2241 case HeapCompatibilityInformation:
2242 if (size_out) *size_out = sizeof(ULONG);
2243
2244 if (size_in < sizeof(ULONG))
2245 return STATUS_BUFFER_TOO_SMALL;
2246
2247 *(ULONG *)info = 0; /* standard heap */
2248 return STATUS_SUCCESS;
2249
2250 default:
2251 FIXME("Unknown heap information class %u\n", info_class);
2252 return STATUS_INVALID_INFO_CLASS;
2253 }
2254 }
Windows API implementation