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push 091faec692ac84fbc736a6b002e76f7e78d28f7b
[wine/hacks.git] / dlls / ntdll / heap.c
blobdf944100f563fed3a3304a96684397da1f77e4ef
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 "wine/list.h"
44 #include "wine/debug.h"
45 #include "wine/server.h"
46
47 WINE_DEFAULT_DEBUG_CHANNEL(heap);
48
49 /* Note: the heap data structures are loosely based on what Pietrek describes in his
50 * book 'Windows 95 System Programming Secrets', with some adaptations for
51 * better compatibility with NT.
52 */
53
54 typedef struct tagARENA_INUSE
55 {
56 DWORD size; /* Block size; must be the first field */
57 DWORD magic : 24; /* Magic number */
58 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) */
59 } ARENA_INUSE;
60
61 typedef struct tagARENA_FREE
62 {
63 DWORD size; /* Block size; must be the first field */
64 DWORD magic; /* Magic number */
65 struct list entry; /* Entry in free list */
66 } ARENA_FREE;
67
68 typedef struct
69 {
70 struct list entry; /* entry in heap large blocks list */
71 SIZE_T data_size; /* size of user data */
72 SIZE_T block_size; /* total size of virtual memory block */
73 DWORD pad[2]; /* padding to ensure 16-byte alignment of data */
74 DWORD size; /* fields for compatibility with normal arenas */
75 DWORD magic; /* these must remain at the end of the structure */
76 } ARENA_LARGE;
77
78 #define ARENA_FLAG_FREE 0x00000001 /* flags OR'ed with arena size */
79 #define ARENA_FLAG_PREV_FREE 0x00000002
80 #define ARENA_SIZE_MASK (~3)
81 #define ARENA_LARGE_SIZE 0xfedcba90 /* magic value for 'size' field in large blocks */
82
83 /* Value for arena 'magic' field */
84 #define ARENA_INUSE_MAGIC 0x455355
85 #define ARENA_PENDING_MAGIC 0xbedead
86 #define ARENA_FREE_MAGIC 0x45455246
87 #define ARENA_LARGE_MAGIC 0x6752614c
88
89 #define ARENA_INUSE_FILLER 0x55
90 #define ARENA_TAIL_FILLER 0xab
91 #define ARENA_FREE_FILLER 0xfeeefeee
92
93 /* everything is aligned on 8 byte boundaries (16 for Win64) */
94 #define ALIGNMENT (2*sizeof(void*))
95 #define LARGE_ALIGNMENT 16 /* large blocks have stricter alignment */
96 #define ARENA_OFFSET (ALIGNMENT - sizeof(ARENA_INUSE))
97
98 C_ASSERT( sizeof(ARENA_LARGE) % LARGE_ALIGNMENT == 0 );
99
100 #define ROUND_SIZE(size) ((((size) + ALIGNMENT - 1) & ~(ALIGNMENT-1)) + ARENA_OFFSET)
101
102 #define QUIET 1 /* Suppress messages */
103 #define NOISY 0 /* Report all errors */
104
105 /* minimum data size (without arenas) of an allocated block */
106 /* make sure that it's larger than a free list entry */
107 #define HEAP_MIN_DATA_SIZE ROUND_SIZE(2 * sizeof(struct list))
108 /* minimum size that must remain to shrink an allocated block */
109 #define HEAP_MIN_SHRINK_SIZE (HEAP_MIN_DATA_SIZE+sizeof(ARENA_FREE))
110 /* minimum size to start allocating large blocks */
111 #define HEAP_MIN_LARGE_BLOCK_SIZE 0x7f000
112 /* extra size to add at the end of block for tail checking */
113 #define HEAP_TAIL_EXTRA_SIZE(flags) \
114 ((flags & HEAP_TAIL_CHECKING_ENABLED) || RUNNING_ON_VALGRIND ? ALIGNMENT : 0)
115
116 /* Max size of the blocks on the free lists */
117 static const SIZE_T HEAP_freeListSizes[] =
118 {
119 0x10, 0x20, 0x30, 0x40, 0x60, 0x80, 0x100, 0x200, 0x400, 0x1000, ~0UL
120 };
121 #define HEAP_NB_FREE_LISTS (sizeof(HEAP_freeListSizes)/sizeof(HEAP_freeListSizes[0]))
122
123 typedef union
124 {
125 ARENA_FREE arena;
126 void *alignment[4];
127 } FREE_LIST_ENTRY;
128
129 struct tagHEAP;
130
131 typedef struct tagSUBHEAP
132 {
133 void *base; /* Base address of the sub-heap memory block */
134 SIZE_T size; /* Size of the whole sub-heap */
135 SIZE_T min_commit; /* Minimum committed size */
136 SIZE_T commitSize; /* Committed size of the sub-heap */
137 struct list entry; /* Entry in sub-heap list */
138 struct tagHEAP *heap; /* Main heap structure */
139 DWORD headerSize; /* Size of the heap header */
140 DWORD magic; /* Magic number */
141 } SUBHEAP;
142
143 #define SUBHEAP_MAGIC ((DWORD)('S' | ('U'<<8) | ('B'<<16) | ('H'<<24)))
144
145 typedef struct tagHEAP
146 {
147 DWORD_PTR unknown1[2];
148 DWORD unknown2;
149 DWORD flags; /* Heap flags */
150 DWORD force_flags; /* Forced heap flags for debugging */
151 SUBHEAP subheap; /* First sub-heap */
152 struct list entry; /* Entry in process heap list */
153 struct list subheap_list; /* Sub-heap list */
154 struct list large_list; /* Large blocks list */
155 SIZE_T grow_size; /* Size of next subheap for growing heap */
156 DWORD magic; /* Magic number */
157 DWORD pending_pos; /* Position in pending free requests ring */
158 ARENA_INUSE **pending_free; /* Ring buffer for pending free requests */
159 RTL_CRITICAL_SECTION critSection; /* Critical section for serialization */
160 FREE_LIST_ENTRY *freeList; /* Free lists */
161 } HEAP;
162
163 #define HEAP_MAGIC ((DWORD)('H' | ('E'<<8) | ('A'<<16) | ('P'<<24)))
164
165 #define HEAP_DEF_SIZE 0x110000 /* Default heap size = 1Mb + 64Kb */
166 #define COMMIT_MASK 0xffff /* bitmask for commit/decommit granularity */
167 #define MAX_FREE_PENDING 1024 /* max number of free requests to delay */
168
169 /* some undocumented flags (names are made up) */
170 #define HEAP_PAGE_ALLOCS 0x01000000
171 #define HEAP_VALIDATE 0x10000000
172 #define HEAP_VALIDATE_ALL 0x20000000
173 #define HEAP_VALIDATE_PARAMS 0x40000000
174
175 static HEAP *processHeap; /* main process heap */
176
177 static BOOL HEAP_IsRealArena( HEAP *heapPtr, DWORD flags, LPCVOID block, BOOL quiet );
178
179 /* mark a block of memory as free for debugging purposes */
180 static inline void mark_block_free( void *ptr, SIZE_T size, DWORD flags )
181 {
182 if (flags & HEAP_FREE_CHECKING_ENABLED)
183 {
184 SIZE_T i;
185 for (i = 0; i < size / sizeof(DWORD); i++) ((DWORD *)ptr)[i] = ARENA_FREE_FILLER;
186 }
187 #if defined(VALGRIND_MAKE_MEM_NOACCESS)
188 VALGRIND_DISCARD( VALGRIND_MAKE_MEM_NOACCESS( ptr, size ));
189 #elif defined( VALGRIND_MAKE_NOACCESS)
190 VALGRIND_DISCARD( VALGRIND_MAKE_NOACCESS( ptr, size ));
191 #endif
192 }
193
194 /* mark a block of memory as initialized for debugging purposes */
195 static inline void mark_block_initialized( void *ptr, SIZE_T size )
196 {
197 #if defined(VALGRIND_MAKE_MEM_DEFINED)
198 VALGRIND_DISCARD( VALGRIND_MAKE_MEM_DEFINED( ptr, size ));
199 #elif defined(VALGRIND_MAKE_READABLE)
200 VALGRIND_DISCARD( VALGRIND_MAKE_READABLE( ptr, size ));
201 #endif
202 }
203
204 /* mark a block of memory as uninitialized for debugging purposes */
205 static inline void mark_block_uninitialized( void *ptr, SIZE_T size )
206 {
207 #if defined(VALGRIND_MAKE_MEM_UNDEFINED)
208 VALGRIND_DISCARD( VALGRIND_MAKE_MEM_UNDEFINED( ptr, size ));
209 #elif defined(VALGRIND_MAKE_WRITABLE)
210 VALGRIND_DISCARD( VALGRIND_MAKE_WRITABLE( ptr, size ));
211 #endif
212 }
213
214 /* mark a block of memory as a tail block */
215 static inline void mark_block_tail( void *ptr, SIZE_T size, DWORD flags )
216 {
217 if (flags & HEAP_TAIL_CHECKING_ENABLED)
218 {
219 mark_block_uninitialized( ptr, size );
220 memset( ptr, ARENA_TAIL_FILLER, size );
221 }
222 #if defined(VALGRIND_MAKE_MEM_NOACCESS)
223 VALGRIND_DISCARD( VALGRIND_MAKE_MEM_NOACCESS( ptr, size ));
224 #elif defined( VALGRIND_MAKE_NOACCESS)
225 VALGRIND_DISCARD( VALGRIND_MAKE_NOACCESS( ptr, size ));
226 #endif
227 }
228
229 /* initialize contents of a newly created block of memory */
230 static inline void initialize_block( void *ptr, SIZE_T size, SIZE_T unused, DWORD flags )
231 {
232 if (flags & HEAP_ZERO_MEMORY)
233 {
234 mark_block_initialized( ptr, size );
235 memset( ptr, 0, size );
236 }
237 else
238 {
239 mark_block_uninitialized( ptr, size );
240 if (flags & HEAP_FREE_CHECKING_ENABLED)
241 {
242 memset( ptr, ARENA_INUSE_FILLER, size );
243 mark_block_uninitialized( ptr, size );
244 }
245 }
246
247 mark_block_tail( (char *)ptr + size, unused, flags );
248 }
249
250 /* notify that a new block of memory has been allocated for debugging purposes */
251 static inline void notify_alloc( void *ptr, SIZE_T size, BOOL init )
252 {
253 #ifdef VALGRIND_MALLOCLIKE_BLOCK
254 VALGRIND_MALLOCLIKE_BLOCK( ptr, size, 0, init );
255 #endif
256 }
257
258 /* notify that a block of memory has been freed for debugging purposes */
259 static inline void notify_free( void const *ptr )
260 {
261 #ifdef VALGRIND_FREELIKE_BLOCK
262 VALGRIND_FREELIKE_BLOCK( ptr, 0 );
263 #endif
264 }
265
266 static void subheap_notify_free_all(SUBHEAP const *subheap)
267 {
268 #ifdef VALGRIND_FREELIKE_BLOCK
269 char const *ptr = (char const *)subheap->base + subheap->headerSize;
270
271 if (!RUNNING_ON_VALGRIND) return;
272
273 while (ptr < (char const *)subheap->base + subheap->size)
274 {
275 if (*(const DWORD *)ptr & ARENA_FLAG_FREE)
276 {
277 ARENA_FREE const *pArena = (ARENA_FREE const *)ptr;
278 if (pArena->magic!=ARENA_FREE_MAGIC) ERR("bad free_magic @%p\n", pArena);
279 ptr += sizeof(*pArena) + (pArena->size & ARENA_SIZE_MASK);
280 }
281 else
282 {
283 ARENA_INUSE const *pArena = (ARENA_INUSE const *)ptr;
284 if (pArena->magic == ARENA_INUSE_MAGIC) notify_free(pArena + 1);
285 else if (pArena->magic != ARENA_PENDING_MAGIC) ERR("bad inuse_magic @%p\n", pArena);
286 ptr += sizeof(*pArena) + (pArena->size & ARENA_SIZE_MASK);
287 }
288 }
289 #endif
290 }
291
292 /* locate a free list entry of the appropriate size */
293 /* size is the size of the whole block including the arena header */
294 static inline unsigned int get_freelist_index( SIZE_T size )
295 {
296 unsigned int i;
297
298 size -= sizeof(ARENA_FREE);
299 for (i = 0; i < HEAP_NB_FREE_LISTS - 1; i++) if (size <= HEAP_freeListSizes[i]) break;
300 return i;
301 }
302
303 /* get the memory protection type to use for a given heap */
304 static inline ULONG get_protection_type( DWORD flags )
305 {
306 return (flags & HEAP_CREATE_ENABLE_EXECUTE) ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
307 }
308
309 static RTL_CRITICAL_SECTION_DEBUG process_heap_critsect_debug =
310 {
311 0, 0, NULL, /* will be set later */
312 { &process_heap_critsect_debug.ProcessLocksList, &process_heap_critsect_debug.ProcessLocksList },
313 0, 0, { (DWORD_PTR)(__FILE__ ": main process heap section") }
314 };
315
316
317 /***********************************************************************
318 * HEAP_Dump
319 */
320 static void HEAP_Dump( HEAP *heap )
321 {
322 unsigned int i;
323 SUBHEAP *subheap;
324 char *ptr;
325
326 DPRINTF( "Heap: %p\n", heap );
327 DPRINTF( "Next: %p Sub-heaps:", LIST_ENTRY( heap->entry.next, HEAP, entry ) );
328 LIST_FOR_EACH_ENTRY( subheap, &heap->subheap_list, SUBHEAP, entry ) DPRINTF( " %p", subheap );
329
330 DPRINTF( "\nFree lists:\n Block Stat Size Id\n" );
331 for (i = 0; i < HEAP_NB_FREE_LISTS; i++)
332 DPRINTF( "%p free %08lx prev=%p next=%p\n",
333 &heap->freeList[i].arena, HEAP_freeListSizes[i],
334 LIST_ENTRY( heap->freeList[i].arena.entry.prev, ARENA_FREE, entry ),
335 LIST_ENTRY( heap->freeList[i].arena.entry.next, ARENA_FREE, entry ));
336
337 LIST_FOR_EACH_ENTRY( subheap, &heap->subheap_list, SUBHEAP, entry )
338 {
339 SIZE_T freeSize = 0, usedSize = 0, arenaSize = subheap->headerSize;
340 DPRINTF( "\n\nSub-heap %p: base=%p size=%08lx committed=%08lx\n",
341 subheap, subheap->base, subheap->size, subheap->commitSize );
342
343 DPRINTF( "\n Block Arena Stat Size Id\n" );
344 ptr = (char *)subheap->base + subheap->headerSize;
345 while (ptr < (char *)subheap->base + subheap->size)
346 {
347 if (*(DWORD *)ptr & ARENA_FLAG_FREE)
348 {
349 ARENA_FREE *pArena = (ARENA_FREE *)ptr;
350 DPRINTF( "%p %08x free %08x prev=%p next=%p\n",
351 pArena, pArena->magic,
352 pArena->size & ARENA_SIZE_MASK,
353 LIST_ENTRY( pArena->entry.prev, ARENA_FREE, entry ),
354 LIST_ENTRY( pArena->entry.next, ARENA_FREE, entry ) );
355 ptr += sizeof(*pArena) + (pArena->size & ARENA_SIZE_MASK);
356 arenaSize += sizeof(ARENA_FREE);
357 freeSize += pArena->size & ARENA_SIZE_MASK;
358 }
359 else if (*(DWORD *)ptr & ARENA_FLAG_PREV_FREE)
360 {
361 ARENA_INUSE *pArena = (ARENA_INUSE *)ptr;
362 DPRINTF( "%p %08x Used %08x back=%p\n",
363 pArena, pArena->magic, pArena->size & ARENA_SIZE_MASK, *((ARENA_FREE **)pArena - 1) );
364 ptr += sizeof(*pArena) + (pArena->size & ARENA_SIZE_MASK);
365 arenaSize += sizeof(ARENA_INUSE);
366 usedSize += pArena->size & ARENA_SIZE_MASK;
367 }
368 else
369 {
370 ARENA_INUSE *pArena = (ARENA_INUSE *)ptr;
371 DPRINTF( "%p %08x %s %08x\n",
372 pArena, pArena->magic, pArena->magic == ARENA_INUSE_MAGIC ? "used" : "pend",
373 pArena->size & ARENA_SIZE_MASK );
374 ptr += sizeof(*pArena) + (pArena->size & ARENA_SIZE_MASK);
375 arenaSize += sizeof(ARENA_INUSE);
376 usedSize += pArena->size & ARENA_SIZE_MASK;
377 }
378 }
379 DPRINTF( "\nTotal: Size=%08lx Committed=%08lx Free=%08lx Used=%08lx Arenas=%08lx (%ld%%)\n\n",
380 subheap->size, subheap->commitSize, freeSize, usedSize,
381 arenaSize, (arenaSize * 100) / subheap->size );
382 }
383 }
384
385
386 static void HEAP_DumpEntry( LPPROCESS_HEAP_ENTRY entry )
387 {
388 WORD rem_flags;
389 TRACE( "Dumping entry %p\n", entry );
390 TRACE( "lpData\t\t: %p\n", entry->lpData );
391 TRACE( "cbData\t\t: %08x\n", entry->cbData);
392 TRACE( "cbOverhead\t: %08x\n", entry->cbOverhead);
393 TRACE( "iRegionIndex\t: %08x\n", entry->iRegionIndex);
394 TRACE( "WFlags\t\t: ");
395 if (entry->wFlags & PROCESS_HEAP_REGION)
396 TRACE( "PROCESS_HEAP_REGION ");
397 if (entry->wFlags & PROCESS_HEAP_UNCOMMITTED_RANGE)
398 TRACE( "PROCESS_HEAP_UNCOMMITTED_RANGE ");
399 if (entry->wFlags & PROCESS_HEAP_ENTRY_BUSY)
400 TRACE( "PROCESS_HEAP_ENTRY_BUSY ");
401 if (entry->wFlags & PROCESS_HEAP_ENTRY_MOVEABLE)
402 TRACE( "PROCESS_HEAP_ENTRY_MOVEABLE ");
403 if (entry->wFlags & PROCESS_HEAP_ENTRY_DDESHARE)
404 TRACE( "PROCESS_HEAP_ENTRY_DDESHARE ");
405 rem_flags = entry->wFlags &
406 ~(PROCESS_HEAP_REGION | PROCESS_HEAP_UNCOMMITTED_RANGE |
407 PROCESS_HEAP_ENTRY_BUSY | PROCESS_HEAP_ENTRY_MOVEABLE|
408 PROCESS_HEAP_ENTRY_DDESHARE);
409 if (rem_flags)
410 TRACE( "Unknown %08x", rem_flags);
411 TRACE( "\n");
412 if ((entry->wFlags & PROCESS_HEAP_ENTRY_BUSY )
413 && (entry->wFlags & PROCESS_HEAP_ENTRY_MOVEABLE))
414 {
415 /* Treat as block */
416 TRACE( "BLOCK->hMem\t\t:%p\n", entry->u.Block.hMem);
417 }
418 if (entry->wFlags & PROCESS_HEAP_REGION)
419 {
420 TRACE( "Region.dwCommittedSize\t:%08x\n",entry->u.Region.dwCommittedSize);
421 TRACE( "Region.dwUnCommittedSize\t:%08x\n",entry->u.Region.dwUnCommittedSize);
422 TRACE( "Region.lpFirstBlock\t:%p\n",entry->u.Region.lpFirstBlock);
423 TRACE( "Region.lpLastBlock\t:%p\n",entry->u.Region.lpLastBlock);
424 }
425 }
426
427 /***********************************************************************
428 * HEAP_GetPtr
429 * RETURNS
430 * Pointer to the heap
431 * NULL: Failure
432 */
433 static HEAP *HEAP_GetPtr(
434 HANDLE heap /* [in] Handle to the heap */
435 ) {
436 HEAP *heapPtr = heap;
437 if (!heapPtr || (heapPtr->magic != HEAP_MAGIC))
438 {
439 ERR("Invalid heap %p!\n", heap );
440 return NULL;
441 }
442 if ((heapPtr->flags & HEAP_VALIDATE_ALL) && !HEAP_IsRealArena( heapPtr, 0, NULL, NOISY ))
443 {
444 if (TRACE_ON(heap))
445 {
446 HEAP_Dump( heapPtr );
447 assert( FALSE );
448 }
449 return NULL;
450 }
451 return heapPtr;
452 }
453
454
455 /***********************************************************************
456 * HEAP_InsertFreeBlock
457 *
458 * Insert a free block into the free list.
459 */
460 static inline void HEAP_InsertFreeBlock( HEAP *heap, ARENA_FREE *pArena, BOOL last )
461 {
462 FREE_LIST_ENTRY *pEntry = heap->freeList + get_freelist_index( pArena->size + sizeof(*pArena) );
463 if (last)
464 {
465 /* insert at end of free list, i.e. before the next free list entry */
466 pEntry++;
467 if (pEntry == &heap->freeList[HEAP_NB_FREE_LISTS]) pEntry = heap->freeList;
468 list_add_before( &pEntry->arena.entry, &pArena->entry );
469 }
470 else
471 {
472 /* insert at head of free list */
473 list_add_after( &pEntry->arena.entry, &pArena->entry );
474 }
475 pArena->size |= ARENA_FLAG_FREE;
476 }
477
478
479 /***********************************************************************
480 * HEAP_FindSubHeap
481 * Find the sub-heap containing a given address.
482 *
483 * RETURNS
484 * Pointer: Success
485 * NULL: Failure
486 */
487 static SUBHEAP *HEAP_FindSubHeap(
488 const HEAP *heap, /* [in] Heap pointer */
489 LPCVOID ptr ) /* [in] Address */
490 {
491 SUBHEAP *sub;
492 LIST_FOR_EACH_ENTRY( sub, &heap->subheap_list, SUBHEAP, entry )
493 if ((ptr >= sub->base) &&
494 ((const char *)ptr < (const char *)sub->base + sub->size - sizeof(ARENA_INUSE)))
495 return sub;
496 return NULL;
497 }
498
499
500 /***********************************************************************
501 * HEAP_Commit
502 *
503 * Make sure the heap storage is committed for a given size in the specified arena.
504 */
505 static inline BOOL HEAP_Commit( SUBHEAP *subheap, ARENA_INUSE *pArena, SIZE_T data_size )
506 {
507 void *ptr = (char *)(pArena + 1) + data_size + sizeof(ARENA_FREE);
508 SIZE_T size = (char *)ptr - (char *)subheap->base;
509 size = (size + COMMIT_MASK) & ~COMMIT_MASK;
510 if (size > subheap->size) size = subheap->size;
511 if (size <= subheap->commitSize) return TRUE;
512 size -= subheap->commitSize;
513 ptr = (char *)subheap->base + subheap->commitSize;
514 if (NtAllocateVirtualMemory( NtCurrentProcess(), &ptr, 0,
515 &size, MEM_COMMIT, get_protection_type( subheap->heap->flags ) ))
516 {
517 WARN("Could not commit %08lx bytes at %p for heap %p\n",
518 size, ptr, subheap->heap );
519 return FALSE;
520 }
521 subheap->commitSize += size;
522 return TRUE;
523 }
524
525
526 /***********************************************************************
527 * HEAP_Decommit
528 *
529 * If possible, decommit the heap storage from (including) 'ptr'.
530 */
531 static inline BOOL HEAP_Decommit( SUBHEAP *subheap, void *ptr )
532 {
533 void *addr;
534 SIZE_T decommit_size;
535 SIZE_T size = (char *)ptr - (char *)subheap->base;
536
537 /* round to next block and add one full block */
538 size = ((size + COMMIT_MASK) & ~COMMIT_MASK) + COMMIT_MASK + 1;
539 size = max( size, subheap->min_commit );
540 if (size >= subheap->commitSize) return TRUE;
541 decommit_size = subheap->commitSize - size;
542 addr = (char *)subheap->base + size;
543
544 if (NtFreeVirtualMemory( NtCurrentProcess(), &addr, &decommit_size, MEM_DECOMMIT ))
545 {
546 WARN("Could not decommit %08lx bytes at %p for heap %p\n",
547 decommit_size, (char *)subheap->base + size, subheap->heap );
548 return FALSE;
549 }
550 subheap->commitSize -= decommit_size;
551 return TRUE;
552 }
553
554
555 /***********************************************************************
556 * HEAP_CreateFreeBlock
557 *
558 * Create a free block at a specified address. 'size' is the size of the
559 * whole block, including the new arena.
560 */
561 static void HEAP_CreateFreeBlock( SUBHEAP *subheap, void *ptr, SIZE_T size )
562 {
563 ARENA_FREE *pFree;
564 char *pEnd;
565 BOOL last;
566 DWORD flags = subheap->heap->flags;
567
568 /* Create a free arena */
569 mark_block_uninitialized( ptr, sizeof(ARENA_FREE) );
570 pFree = ptr;
571 pFree->magic = ARENA_FREE_MAGIC;
572
573 /* If debugging, erase the freed block content */
574
575 pEnd = (char *)ptr + size;
576 if (pEnd > (char *)subheap->base + subheap->commitSize)
577 pEnd = (char *)subheap->base + subheap->commitSize;
578 if (pEnd > (char *)(pFree + 1)) mark_block_free( pFree + 1, pEnd - (char *)(pFree + 1), flags );
579
580 /* Check if next block is free also */
581
582 if (((char *)ptr + size < (char *)subheap->base + subheap->size) &&
583 (*(DWORD *)((char *)ptr + size) & ARENA_FLAG_FREE))
584 {
585 /* Remove the next arena from the free list */
586 ARENA_FREE *pNext = (ARENA_FREE *)((char *)ptr + size);
587 list_remove( &pNext->entry );
588 size += (pNext->size & ARENA_SIZE_MASK) + sizeof(*pNext);
589 mark_block_free( pNext, sizeof(ARENA_FREE), flags );
590 }
591
592 /* Set the next block PREV_FREE flag and pointer */
593
594 last = ((char *)ptr + size >= (char *)subheap->base + subheap->size);
595 if (!last)
596 {
597 DWORD *pNext = (DWORD *)((char *)ptr + size);
598 *pNext |= ARENA_FLAG_PREV_FREE;
599 mark_block_initialized( (ARENA_FREE **)pNext - 1, sizeof( ARENA_FREE * ) );
600 *((ARENA_FREE **)pNext - 1) = pFree;
601 }
602
603 /* Last, insert the new block into the free list */
604
605 pFree->size = size - sizeof(*pFree);
606 HEAP_InsertFreeBlock( subheap->heap, pFree, last );
607 }
608
609
610 /***********************************************************************
611 * HEAP_MakeInUseBlockFree
612 *
613 * Turn an in-use block into a free block. Can also decommit the end of
614 * the heap, and possibly even free the sub-heap altogether.
615 */
616 static void HEAP_MakeInUseBlockFree( SUBHEAP *subheap, ARENA_INUSE *pArena )
617 {
618 HEAP *heap = subheap->heap;
619 ARENA_FREE *pFree;
620 SIZE_T size;
621
622 if (heap->pending_free)
623 {
624 ARENA_INUSE *prev = heap->pending_free[heap->pending_pos];
625 heap->pending_free[heap->pending_pos] = pArena;
626 heap->pending_pos = (heap->pending_pos + 1) % MAX_FREE_PENDING;
627 pArena->magic = ARENA_PENDING_MAGIC;
628 mark_block_free( pArena + 1, pArena->size & ARENA_SIZE_MASK, heap->flags );
629 if (!prev) return;
630 pArena = prev;
631 subheap = HEAP_FindSubHeap( heap, pArena );
632 }
633
634 /* Check if we can merge with previous block */
635
636 size = (pArena->size & ARENA_SIZE_MASK) + sizeof(*pArena);
637 if (pArena->size & ARENA_FLAG_PREV_FREE)
638 {
639 pFree = *((ARENA_FREE **)pArena - 1);
640 size += (pFree->size & ARENA_SIZE_MASK) + sizeof(ARENA_FREE);
641 /* Remove it from the free list */
642 list_remove( &pFree->entry );
643 }
644 else pFree = (ARENA_FREE *)pArena;
645
646 /* Create a free block */
647
648 HEAP_CreateFreeBlock( subheap, pFree, size );
649 size = (pFree->size & ARENA_SIZE_MASK) + sizeof(ARENA_FREE);
650 if ((char *)pFree + size < (char *)subheap->base + subheap->size)
651 return; /* Not the last block, so nothing more to do */
652
653 /* Free the whole sub-heap if it's empty and not the original one */
654
655 if (((char *)pFree == (char *)subheap->base + subheap->headerSize) &&
656 (subheap != &subheap->heap->subheap))
657 {
658 SIZE_T size = 0;
659 void *addr = subheap->base;
660 /* Remove the free block from the list */
661 list_remove( &pFree->entry );
662 /* Remove the subheap from the list */
663 list_remove( &subheap->entry );
664 /* Free the memory */
665 subheap->magic = 0;
666 NtFreeVirtualMemory( NtCurrentProcess(), &addr, &size, MEM_RELEASE );
667 return;
668 }
669
670 /* Decommit the end of the heap */
671
672 if (!(subheap->heap->flags & HEAP_SHARED)) HEAP_Decommit( subheap, pFree + 1 );
673 }
674
675
676 /***********************************************************************
677 * HEAP_ShrinkBlock
678 *
679 * Shrink an in-use block.
680 */
681 static void HEAP_ShrinkBlock(SUBHEAP *subheap, ARENA_INUSE *pArena, SIZE_T size)
682 {
683 if ((pArena->size & ARENA_SIZE_MASK) >= size + HEAP_MIN_SHRINK_SIZE)
684 {
685 HEAP_CreateFreeBlock( subheap, (char *)(pArena + 1) + size,
686 (pArena->size & ARENA_SIZE_MASK) - size );
687 /* assign size plus previous arena flags */
688 pArena->size = size | (pArena->size & ~ARENA_SIZE_MASK);
689 }
690 else
691 {
692 /* Turn off PREV_FREE flag in next block */
693 char *pNext = (char *)(pArena + 1) + (pArena->size & ARENA_SIZE_MASK);
694 if (pNext < (char *)subheap->base + subheap->size)
695 *(DWORD *)pNext &= ~ARENA_FLAG_PREV_FREE;
696 }
697 }
698
699
700 /***********************************************************************
701 * allocate_large_block
702 */
703 static void *allocate_large_block( HEAP *heap, DWORD flags, SIZE_T size )
704 {
705 ARENA_LARGE *arena;
706 SIZE_T block_size = sizeof(*arena) + ROUND_SIZE(size) + HEAP_TAIL_EXTRA_SIZE(flags);
707 LPVOID address = NULL;
708
709 if (block_size < size) return NULL; /* overflow */
710 if (NtAllocateVirtualMemory( NtCurrentProcess(), &address, 5,
711 &block_size, MEM_COMMIT, get_protection_type( flags ) ))
712 {
713 WARN("Could not allocate block for %08lx bytes\n", size );
714 return NULL;
715 }
716 arena = address;
717 arena->data_size = size;
718 arena->block_size = block_size;
719 arena->size = ARENA_LARGE_SIZE;
720 arena->magic = ARENA_LARGE_MAGIC;
721 mark_block_tail( (char *)(arena + 1) + size, block_size - sizeof(*arena) - size, flags );
722 list_add_tail( &heap->large_list, &arena->entry );
723 notify_alloc( arena + 1, size, flags & HEAP_ZERO_MEMORY );
724 return arena + 1;
725 }
726
727
728 /***********************************************************************
729 * free_large_block
730 */
731 static void free_large_block( HEAP *heap, DWORD flags, void *ptr )
732 {
733 ARENA_LARGE *arena = (ARENA_LARGE *)ptr - 1;
734 LPVOID address = arena;
735 SIZE_T size = 0;
736
737 list_remove( &arena->entry );
738 NtFreeVirtualMemory( NtCurrentProcess(), &address, &size, MEM_RELEASE );
739 }
740
741
742 /***********************************************************************
743 * realloc_large_block
744 */
745 static void *realloc_large_block( HEAP *heap, DWORD flags, void *ptr, SIZE_T size )
746 {
747 ARENA_LARGE *arena = (ARENA_LARGE *)ptr - 1;
748 void *new_ptr;
749
750 if (arena->block_size - sizeof(*arena) >= size)
751 {
752 SIZE_T unused = arena->block_size - sizeof(*arena) - size;
753
754 /* FIXME: we could remap zero-pages instead */
755 if (size > arena->data_size)
756 initialize_block( (char *)ptr + arena->data_size, size - arena->data_size, unused, flags );
757 else
758 mark_block_tail( (char *)ptr + size, unused, flags );
759 arena->data_size = size;
760 return ptr;
761 }
762 if (flags & HEAP_REALLOC_IN_PLACE_ONLY) return NULL;
763 if (!(new_ptr = allocate_large_block( heap, flags, size )))
764 {
765 WARN("Could not allocate block for %08lx bytes\n", size );
766 return NULL;
767 }
768 memcpy( new_ptr, ptr, arena->data_size );
769 free_large_block( heap, flags, ptr );
770 notify_free( ptr );
771 return new_ptr;
772 }
773
774
775 /***********************************************************************
776 * find_large_block
777 */
778 static ARENA_LARGE *find_large_block( HEAP *heap, const void *ptr )
779 {
780 ARENA_LARGE *arena;
781
782 LIST_FOR_EACH_ENTRY( arena, &heap->large_list, ARENA_LARGE, entry )
783 if (ptr == arena + 1) return arena;
784
785 return NULL;
786 }
787
788
789 /***********************************************************************
790 * validate_large_arena
791 */
792 static BOOL validate_large_arena( HEAP *heap, const ARENA_LARGE *arena, BOOL quiet )
793 {
794 DWORD flags = heap->flags;
795
796 if ((ULONG_PTR)arena % getpagesize())
797 {
798 if (quiet == NOISY)
799 {
800 ERR( "Heap %p: invalid large arena pointer %p\n", heap, arena );
801 if (TRACE_ON(heap)) HEAP_Dump( heap );
802 }
803 else if (WARN_ON(heap))
804 {
805 WARN( "Heap %p: unaligned arena pointer %p\n", heap, arena );
806 if (TRACE_ON(heap)) HEAP_Dump( heap );
807 }
808 return FALSE;
809 }
810 if (arena->size != ARENA_LARGE_SIZE || arena->magic != ARENA_LARGE_MAGIC)
811 {
812 if (quiet == NOISY)
813 {
814 ERR( "Heap %p: invalid large arena %p values %x/%x\n",
815 heap, arena, arena->size, arena->magic );
816 if (TRACE_ON(heap)) HEAP_Dump( heap );
817 }
818 else if (WARN_ON(heap))
819 {
820 WARN( "Heap %p: invalid large arena %p values %x/%x\n",
821 heap, arena, arena->size, arena->magic );
822 if (TRACE_ON(heap)) HEAP_Dump( heap );
823 }
824 return FALSE;
825 }
826 if (arena->data_size > arena->block_size - sizeof(*arena))
827 {
828 ERR( "Heap %p: invalid large arena %p size %lx/%lx\n",
829 heap, arena, arena->data_size, arena->block_size );
830 return FALSE;
831 }
832 if (flags & HEAP_TAIL_CHECKING_ENABLED)
833 {
834 SIZE_T i, unused = arena->block_size - sizeof(*arena) - arena->data_size;
835 const unsigned char *data = (const unsigned char *)(arena + 1) + arena->data_size;
836
837 for (i = 0; i < unused; i++)
838 {
839 if (data[i] == ARENA_TAIL_FILLER) continue;
840 ERR("Heap %p: block %p tail overwritten at %p (byte %lu/%lu == 0x%02x)\n",
841 heap, arena + 1, data + i, i, unused, data[i] );
842 return FALSE;
843 }
844 }
845 return TRUE;
846 }
847
848
849 /***********************************************************************
850 * HEAP_CreateSubHeap
851 */
852 static SUBHEAP *HEAP_CreateSubHeap( HEAP *heap, LPVOID address, DWORD flags,
853 SIZE_T commitSize, SIZE_T totalSize )
854 {
855 SUBHEAP *subheap;
856 FREE_LIST_ENTRY *pEntry;
857 unsigned int i;
858
859 if (!address)
860 {
861 if (!commitSize) commitSize = COMMIT_MASK + 1;
862 totalSize = min( totalSize, 0xffff0000 ); /* don't allow a heap larger than 4Gb */
863 if (totalSize < commitSize) totalSize = commitSize;
864 if (flags & HEAP_SHARED) commitSize = totalSize; /* always commit everything in a shared heap */
865 commitSize = min( totalSize, (commitSize + COMMIT_MASK) & ~COMMIT_MASK );
866
867 /* allocate the memory block */
868 if (NtAllocateVirtualMemory( NtCurrentProcess(), &address, 5, &totalSize,
869 MEM_RESERVE, get_protection_type( flags ) ))
870 {
871 WARN("Could not allocate %08lx bytes\n", totalSize );
872 return NULL;
873 }
874 if (NtAllocateVirtualMemory( NtCurrentProcess(), &address, 0,
875 &commitSize, MEM_COMMIT, get_protection_type( flags ) ))
876 {
877 WARN("Could not commit %08lx bytes for sub-heap %p\n", commitSize, address );
878 return NULL;
879 }
880 }
881
882 if (heap)
883 {
884 /* If this is a secondary subheap, insert it into list */
885
886 subheap = address;
887 subheap->base = address;
888 subheap->heap = heap;
889 subheap->size = totalSize;
890 subheap->min_commit = 0x10000;
891 subheap->commitSize = commitSize;
892 subheap->magic = SUBHEAP_MAGIC;
893 subheap->headerSize = ROUND_SIZE( sizeof(SUBHEAP) );
894 list_add_head( &heap->subheap_list, &subheap->entry );
895 }
896 else
897 {
898 /* If this is a primary subheap, initialize main heap */
899
900 heap = address;
901 heap->flags = flags;
902 heap->magic = HEAP_MAGIC;
903 heap->grow_size = max( HEAP_DEF_SIZE, totalSize );
904 list_init( &heap->subheap_list );
905 list_init( &heap->large_list );
906
907 subheap = &heap->subheap;
908 subheap->base = address;
909 subheap->heap = heap;
910 subheap->size = totalSize;
911 subheap->min_commit = commitSize;
912 subheap->commitSize = commitSize;
913 subheap->magic = SUBHEAP_MAGIC;
914 subheap->headerSize = ROUND_SIZE( sizeof(HEAP) );
915 list_add_head( &heap->subheap_list, &subheap->entry );
916
917 /* Build the free lists */
918
919 heap->freeList = (FREE_LIST_ENTRY *)((char *)heap + subheap->headerSize);
920 subheap->headerSize += HEAP_NB_FREE_LISTS * sizeof(FREE_LIST_ENTRY);
921 list_init( &heap->freeList[0].arena.entry );
922 for (i = 0, pEntry = heap->freeList; i < HEAP_NB_FREE_LISTS; i++, pEntry++)
923 {
924 pEntry->arena.size = 0 | ARENA_FLAG_FREE;
925 pEntry->arena.magic = ARENA_FREE_MAGIC;
926 if (i) list_add_after( &pEntry[-1].arena.entry, &pEntry->arena.entry );
927 }
928
929 /* Initialize critical section */
930
931 if (!processHeap) /* do it by hand to avoid memory allocations */
932 {
933 heap->critSection.DebugInfo = &process_heap_critsect_debug;
934 heap->critSection.LockCount = -1;
935 heap->critSection.RecursionCount = 0;
936 heap->critSection.OwningThread = 0;
937 heap->critSection.LockSemaphore = 0;
938 heap->critSection.SpinCount = 0;
939 process_heap_critsect_debug.CriticalSection = &heap->critSection;
940 }
941 else
942 {
943 RtlInitializeCriticalSection( &heap->critSection );
944 heap->critSection.DebugInfo->Spare[0] = (DWORD_PTR)(__FILE__ ": HEAP.critSection");
945 }
946
947 if (flags & HEAP_SHARED)
948 {
949 /* let's assume that only one thread at a time will try to do this */
950 HANDLE sem = heap->critSection.LockSemaphore;
951 if (!sem) NtCreateSemaphore( &sem, SEMAPHORE_ALL_ACCESS, NULL, 0, 1 );
952
953 NtDuplicateObject( NtCurrentProcess(), sem, NtCurrentProcess(), &sem, 0, 0,
954 DUP_HANDLE_MAKE_GLOBAL | DUP_HANDLE_SAME_ACCESS | DUP_HANDLE_CLOSE_SOURCE );
955 heap->critSection.LockSemaphore = sem;
956 RtlFreeHeap( processHeap, 0, heap->critSection.DebugInfo );
957 heap->critSection.DebugInfo = NULL;
958 }
959 }
960
961 /* Create the first free block */
962
963 HEAP_CreateFreeBlock( subheap, (LPBYTE)subheap->base + subheap->headerSize,
964 subheap->size - subheap->headerSize );
965
966 return subheap;
967 }
968
969
970 /***********************************************************************
971 * HEAP_FindFreeBlock
972 *
973 * Find a free block at least as large as the requested size, and make sure
974 * the requested size is committed.
975 */
976 static ARENA_FREE *HEAP_FindFreeBlock( HEAP *heap, SIZE_T size,
977 SUBHEAP **ppSubHeap )
978 {
979 SUBHEAP *subheap;
980 struct list *ptr;
981 SIZE_T total_size;
982 FREE_LIST_ENTRY *pEntry = heap->freeList + get_freelist_index( size + sizeof(ARENA_INUSE) );
983
984 /* Find a suitable free list, and in it find a block large enough */
985
986 ptr = &pEntry->arena.entry;
987 while ((ptr = list_next( &heap->freeList[0].arena.entry, ptr )))
988 {
989 ARENA_FREE *pArena = LIST_ENTRY( ptr, ARENA_FREE, entry );
990 SIZE_T arena_size = (pArena->size & ARENA_SIZE_MASK) +
991 sizeof(ARENA_FREE) - sizeof(ARENA_INUSE);
992 if (arena_size >= size)
993 {
994 subheap = HEAP_FindSubHeap( heap, pArena );
995 if (!HEAP_Commit( subheap, (ARENA_INUSE *)pArena, size )) return NULL;
996 *ppSubHeap = subheap;
997 return pArena;
998 }
999 }
1000
1001 /* If no block was found, attempt to grow the heap */
1002
1003 if (!(heap->flags & HEAP_GROWABLE))
1004 {
1005 WARN("Not enough space in heap %p for %08lx bytes\n", heap, size );
1006 return NULL;
1007 }
1008 /* make sure that we have a big enough size *committed* to fit another
1009 * last free arena in !
1010 * So just one heap struct, one first free arena which will eventually
1011 * get used, and a second free arena that might get assigned all remaining
1012 * free space in HEAP_ShrinkBlock() */
1013 total_size = size + ROUND_SIZE(sizeof(SUBHEAP)) + sizeof(ARENA_INUSE) + sizeof(ARENA_FREE);
1014 if (total_size < size) return NULL; /* overflow */
1015
1016 if ((subheap = HEAP_CreateSubHeap( heap, NULL, heap->flags, total_size,
1017 max( heap->grow_size, total_size ) )))
1018 {
1019 if (heap->grow_size < 128 * 1024 * 1024) heap->grow_size *= 2;
1020 }
1021 else while (!subheap) /* shrink the grow size again if we are running out of space */
1022 {
1023 if (heap->grow_size <= total_size || heap->grow_size <= 4 * 1024 * 1024) return NULL;
1024 heap->grow_size /= 2;
1025 subheap = HEAP_CreateSubHeap( heap, NULL, heap->flags, total_size,
1026 max( heap->grow_size, total_size ) );
1027 }
1028
1029 TRACE("created new sub-heap %p of %08lx bytes for heap %p\n",
1030 subheap, subheap->size, heap );
1031
1032 *ppSubHeap = subheap;
1033 return (ARENA_FREE *)((char *)subheap->base + subheap->headerSize);
1034 }
1035
1036
1037 /***********************************************************************
1038 * HEAP_IsValidArenaPtr
1039 *
1040 * Check that the pointer is inside the range possible for arenas.
1041 */
1042 static BOOL HEAP_IsValidArenaPtr( const HEAP *heap, const ARENA_FREE *ptr )
1043 {
1044 unsigned int i;
1045 const SUBHEAP *subheap = HEAP_FindSubHeap( heap, ptr );
1046 if (!subheap) return FALSE;
1047 if ((const char *)ptr >= (const char *)subheap->base + subheap->headerSize) return TRUE;
1048 if (subheap != &heap->subheap) return FALSE;
1049 for (i = 0; i < HEAP_NB_FREE_LISTS; i++)
1050 if (ptr == &heap->freeList[i].arena) return TRUE;
1051 return FALSE;
1052 }
1053
1054
1055 /***********************************************************************
1056 * HEAP_ValidateFreeArena
1057 */
1058 static BOOL HEAP_ValidateFreeArena( SUBHEAP *subheap, ARENA_FREE *pArena )
1059 {
1060 DWORD flags = subheap->heap->flags;
1061 SIZE_T size;
1062 ARENA_FREE *prev, *next;
1063 char *heapEnd = (char *)subheap->base + subheap->size;
1064
1065 /* Check for unaligned pointers */
1066 if ((ULONG_PTR)pArena % ALIGNMENT != ARENA_OFFSET)
1067 {
1068 ERR("Heap %p: unaligned arena pointer %p\n", subheap->heap, pArena );
1069 return FALSE;
1070 }
1071
1072 /* Check magic number */
1073 if (pArena->magic != ARENA_FREE_MAGIC)
1074 {
1075 ERR("Heap %p: invalid free arena magic %08x for %p\n", subheap->heap, pArena->magic, pArena );
1076 return FALSE;
1077 }
1078 /* Check size flags */
1079 if (!(pArena->size & ARENA_FLAG_FREE) ||
1080 (pArena->size & ARENA_FLAG_PREV_FREE))
1081 {
1082 ERR("Heap %p: bad flags %08x for free arena %p\n",
1083 subheap->heap, pArena->size & ~ARENA_SIZE_MASK, pArena );
1084 return FALSE;
1085 }
1086 /* Check arena size */
1087 size = pArena->size & ARENA_SIZE_MASK;
1088 if ((char *)(pArena + 1) + size > heapEnd)
1089 {
1090 ERR("Heap %p: bad size %08lx for free arena %p\n", subheap->heap, size, pArena );
1091 return FALSE;
1092 }
1093 /* Check that next pointer is valid */
1094 next = LIST_ENTRY( pArena->entry.next, ARENA_FREE, entry );
1095 if (!HEAP_IsValidArenaPtr( subheap->heap, next ))
1096 {
1097 ERR("Heap %p: bad next ptr %p for arena %p\n",
1098 subheap->heap, next, pArena );
1099 return FALSE;
1100 }
1101 /* Check that next arena is free */
1102 if (!(next->size & ARENA_FLAG_FREE) || (next->magic != ARENA_FREE_MAGIC))
1103 {
1104 ERR("Heap %p: next arena %p invalid for %p\n",
1105 subheap->heap, next, pArena );
1106 return FALSE;
1107 }
1108 /* Check that prev pointer is valid */
1109 prev = LIST_ENTRY( pArena->entry.prev, ARENA_FREE, entry );
1110 if (!HEAP_IsValidArenaPtr( subheap->heap, prev ))
1111 {
1112 ERR("Heap %p: bad prev ptr %p for arena %p\n",
1113 subheap->heap, prev, pArena );
1114 return FALSE;
1115 }
1116 /* Check that prev arena is free */
1117 if (!(prev->size & ARENA_FLAG_FREE) || (prev->magic != ARENA_FREE_MAGIC))
1118 {
1119 /* this often means that the prev arena got overwritten
1120 * by a memory write before that prev arena */
1121 ERR("Heap %p: prev arena %p invalid for %p\n",
1122 subheap->heap, prev, pArena );
1123 return FALSE;
1124 }
1125 /* Check that next block has PREV_FREE flag */
1126 if ((char *)(pArena + 1) + size < heapEnd)
1127 {
1128 if (!(*(DWORD *)((char *)(pArena + 1) + size) & ARENA_FLAG_PREV_FREE))
1129 {
1130 ERR("Heap %p: free arena %p next block has no PREV_FREE flag\n",
1131 subheap->heap, pArena );
1132 return FALSE;
1133 }
1134 /* Check next block back pointer */
1135 if (*((ARENA_FREE **)((char *)(pArena + 1) + size) - 1) != pArena)
1136 {
1137 ERR("Heap %p: arena %p has wrong back ptr %p\n",
1138 subheap->heap, pArena,
1139 *((ARENA_FREE **)((char *)(pArena+1) + size) - 1));
1140 return FALSE;
1141 }
1142 }
1143 if (flags & HEAP_FREE_CHECKING_ENABLED)
1144 {
1145 DWORD *ptr = (DWORD *)(pArena + 1);
1146 char *end = (char *)(pArena + 1) + size;
1147
1148 if (end >= heapEnd) end = (char *)subheap->base + subheap->commitSize;
1149 else end -= sizeof(ARENA_FREE *);
1150 while (ptr < (DWORD *)end)
1151 {
1152 if (*ptr != ARENA_FREE_FILLER)
1153 {
1154 ERR("Heap %p: free block %p overwritten at %p by %08x\n",
1155 subheap->heap, (ARENA_INUSE *)pArena + 1, ptr, *ptr );
1156 return FALSE;
1157 }
1158 ptr++;
1159 }
1160 }
1161 return TRUE;
1162 }
1163
1164
1165 /***********************************************************************
1166 * HEAP_ValidateInUseArena
1167 */
1168 static BOOL HEAP_ValidateInUseArena( const SUBHEAP *subheap, const ARENA_INUSE *pArena, BOOL quiet )
1169 {
1170 SIZE_T size;
1171 DWORD i, flags = subheap->heap->flags;
1172 const char *heapEnd = (const char *)subheap->base + subheap->size;
1173
1174 /* Check for unaligned pointers */
1175 if ((ULONG_PTR)pArena % ALIGNMENT != ARENA_OFFSET)
1176 {
1177 if ( quiet == NOISY )
1178 {
1179 ERR( "Heap %p: unaligned arena pointer %p\n", subheap->heap, pArena );
1180 if ( TRACE_ON(heap) )
1181 HEAP_Dump( subheap->heap );
1182 }
1183 else if ( WARN_ON(heap) )
1184 {
1185 WARN( "Heap %p: unaligned arena pointer %p\n", subheap->heap, pArena );
1186 if ( TRACE_ON(heap) )
1187 HEAP_Dump( subheap->heap );
1188 }
1189 return FALSE;
1190 }
1191
1192 /* Check magic number */
1193 if (pArena->magic != ARENA_INUSE_MAGIC && pArena->magic != ARENA_PENDING_MAGIC)
1194 {
1195 if (quiet == NOISY) {
1196 ERR("Heap %p: invalid in-use arena magic %08x for %p\n", subheap->heap, pArena->magic, pArena );
1197 if (TRACE_ON(heap))
1198 HEAP_Dump( subheap->heap );
1199 } else if (WARN_ON(heap)) {
1200 WARN("Heap %p: invalid in-use arena magic %08x for %p\n", subheap->heap, pArena->magic, pArena );
1201 if (TRACE_ON(heap))
1202 HEAP_Dump( subheap->heap );
1203 }
1204 return FALSE;
1205 }
1206 /* Check size flags */
1207 if (pArena->size & ARENA_FLAG_FREE)
1208 {
1209 ERR("Heap %p: bad flags %08x for in-use arena %p\n",
1210 subheap->heap, pArena->size & ~ARENA_SIZE_MASK, pArena );
1211 return FALSE;
1212 }
1213 /* Check arena size */
1214 size = pArena->size & ARENA_SIZE_MASK;
1215 if ((const char *)(pArena + 1) + size > heapEnd ||
1216 (const char *)(pArena + 1) + size < (const char *)(pArena + 1))
1217 {
1218 ERR("Heap %p: bad size %08lx for in-use arena %p\n", subheap->heap, size, pArena );
1219 return FALSE;
1220 }
1221 /* Check next arena PREV_FREE flag */
1222 if (((const char *)(pArena + 1) + size < heapEnd) &&
1223 (*(const DWORD *)((const char *)(pArena + 1) + size) & ARENA_FLAG_PREV_FREE))
1224 {
1225 ERR("Heap %p: in-use arena %p next block %p has PREV_FREE flag %x\n",
1226 subheap->heap, pArena, (const char *)(pArena + 1) + size,*(const DWORD *)((const char *)(pArena + 1) + size) );
1227 return FALSE;
1228 }
1229 /* Check prev free arena */
1230 if (pArena->size & ARENA_FLAG_PREV_FREE)
1231 {
1232 const ARENA_FREE *pPrev = *((const ARENA_FREE * const*)pArena - 1);
1233 /* Check prev pointer */
1234 if (!HEAP_IsValidArenaPtr( subheap->heap, pPrev ))
1235 {
1236 ERR("Heap %p: bad back ptr %p for arena %p\n",
1237 subheap->heap, pPrev, pArena );
1238 return FALSE;
1239 }
1240 /* Check that prev arena is free */
1241 if (!(pPrev->size & ARENA_FLAG_FREE) ||
1242 (pPrev->magic != ARENA_FREE_MAGIC))
1243 {
1244 ERR("Heap %p: prev arena %p invalid for in-use %p\n",
1245 subheap->heap, pPrev, pArena );
1246 return FALSE;
1247 }
1248 /* Check that prev arena is really the previous block */
1249 if ((const char *)(pPrev + 1) + (pPrev->size & ARENA_SIZE_MASK) != (const char *)pArena)
1250 {
1251 ERR("Heap %p: prev arena %p is not prev for in-use %p\n",
1252 subheap->heap, pPrev, pArena );
1253 return FALSE;
1254 }
1255 }
1256 /* Check unused size */
1257 if (pArena->unused_bytes > size)
1258 {
1259 ERR("Heap %p: invalid unused size %08x/%08lx\n", subheap->heap, pArena->unused_bytes, size );
1260 return FALSE;
1261 }
1262 /* Check unused bytes */
1263 if (pArena->magic == ARENA_PENDING_MAGIC)
1264 {
1265 const DWORD *ptr = (const DWORD *)(pArena + 1);
1266 const DWORD *end = (const DWORD *)((const char *)ptr + size);
1267
1268 while (ptr < end)
1269 {
1270 if (*ptr != ARENA_FREE_FILLER)
1271 {
1272 ERR("Heap %p: free block %p overwritten at %p by %08x\n",
1273 subheap->heap, (const ARENA_INUSE *)pArena + 1, ptr, *ptr );
1274 if (!*ptr) { HEAP_Dump( subheap->heap ); DbgBreakPoint(); }
1275 return FALSE;
1276 }
1277 ptr++;
1278 }
1279 }
1280 else if (flags & HEAP_TAIL_CHECKING_ENABLED)
1281 {
1282 const unsigned char *data = (const unsigned char *)(pArena + 1) + size - pArena->unused_bytes;
1283
1284 for (i = 0; i < pArena->unused_bytes; i++)
1285 {
1286 if (data[i] == ARENA_TAIL_FILLER) continue;
1287 ERR("Heap %p: block %p tail overwritten at %p (byte %u/%u == 0x%02x)\n",
1288 subheap->heap, pArena + 1, data + i, i, pArena->unused_bytes, data[i] );
1289 return FALSE;
1290 }
1291 }
1292 return TRUE;
1293 }
1294
1295
1296 /***********************************************************************
1297 * HEAP_IsRealArena [Internal]
1298 * Validates a block is a valid arena.
1299 *
1300 * RETURNS
1301 * TRUE: Success
1302 * FALSE: Failure
1303 */
1304 static BOOL HEAP_IsRealArena( HEAP *heapPtr, /* [in] ptr to the heap */
1305 DWORD flags, /* [in] Bit flags that control access during operation */
1306 LPCVOID block, /* [in] Optional pointer to memory block to validate */
1307 BOOL quiet ) /* [in] Flag - if true, HEAP_ValidateInUseArena
1308 * does not complain */
1309 {
1310 SUBHEAP *subheap;
1311 BOOL ret = TRUE;
1312 const ARENA_LARGE *large_arena;
1313
1314 flags &= HEAP_NO_SERIALIZE;
1315 flags |= heapPtr->flags;
1316 /* calling HeapLock may result in infinite recursion, so do the critsect directly */
1317 if (!(flags & HEAP_NO_SERIALIZE))
1318 RtlEnterCriticalSection( &heapPtr->critSection );
1319
1320 if (block) /* only check this single memory block */
1321 {
1322 const ARENA_INUSE *arena = (const ARENA_INUSE *)block - 1;
1323
1324 if (!(subheap = HEAP_FindSubHeap( heapPtr, arena )) ||
1325 ((const char *)arena < (char *)subheap->base + subheap->headerSize))
1326 {
1327 if (!(large_arena = find_large_block( heapPtr, block )))
1328 {
1329 if (quiet == NOISY)
1330 ERR("Heap %p: block %p is not inside heap\n", heapPtr, block );
1331 else if (WARN_ON(heap))
1332 WARN("Heap %p: block %p is not inside heap\n", heapPtr, block );
1333 ret = FALSE;
1334 }
1335 else
1336 ret = validate_large_arena( heapPtr, large_arena, quiet );
1337 } else
1338 ret = HEAP_ValidateInUseArena( subheap, arena, quiet );
1339
1340 if (!(flags & HEAP_NO_SERIALIZE))
1341 RtlLeaveCriticalSection( &heapPtr->critSection );
1342 return ret;
1343 }
1344
1345 LIST_FOR_EACH_ENTRY( subheap, &heapPtr->subheap_list, SUBHEAP, entry )
1346 {
1347 char *ptr = (char *)subheap->base + subheap->headerSize;
1348 while (ptr < (char *)subheap->base + subheap->size)
1349 {
1350 if (*(DWORD *)ptr & ARENA_FLAG_FREE)
1351 {
1352 if (!HEAP_ValidateFreeArena( subheap, (ARENA_FREE *)ptr )) {
1353 ret = FALSE;
1354 break;
1355 }
1356 ptr += sizeof(ARENA_FREE) + (*(DWORD *)ptr & ARENA_SIZE_MASK);
1357 }
1358 else
1359 {
1360 if (!HEAP_ValidateInUseArena( subheap, (ARENA_INUSE *)ptr, NOISY )) {
1361 ret = FALSE;
1362 break;
1363 }
1364 ptr += sizeof(ARENA_INUSE) + (*(DWORD *)ptr & ARENA_SIZE_MASK);
1365 }
1366 }
1367 if (!ret) break;
1368 }
1369
1370 LIST_FOR_EACH_ENTRY( large_arena, &heapPtr->large_list, ARENA_LARGE, entry )
1371 if (!(ret = validate_large_arena( heapPtr, large_arena, quiet ))) break;
1372
1373 if (!(flags & HEAP_NO_SERIALIZE)) RtlLeaveCriticalSection( &heapPtr->critSection );
1374 return ret;
1375 }
1376
1377
1378 /***********************************************************************
1379 * validate_block_pointer
1380 *
1381 * Minimum validation needed to catch bad parameters in heap functions.
1382 */
1383 static BOOL validate_block_pointer( HEAP *heap, SUBHEAP **ret_subheap, const ARENA_INUSE *arena )
1384 {
1385 SUBHEAP *subheap;
1386 BOOL ret = FALSE;
1387
1388 if (!(*ret_subheap = subheap = HEAP_FindSubHeap( heap, arena )))
1389 {
1390 ARENA_LARGE *large_arena = find_large_block( heap, arena + 1 );
1391
1392 if (!large_arena)
1393 {
1394 WARN( "Heap %p: pointer %p is not inside heap\n", heap, arena + 1 );
1395 return FALSE;
1396 }
1397 if ((heap->flags & HEAP_VALIDATE) && !validate_large_arena( heap, large_arena, QUIET ))
1398 return FALSE;
1399 return TRUE;
1400 }
1401
1402 if ((const char *)arena < (char *)subheap->base + subheap->headerSize)
1403 WARN( "Heap %p: pointer %p is inside subheap %p header\n", subheap->heap, arena + 1, subheap );
1404 else if (subheap->heap->flags & HEAP_VALIDATE) /* do the full validation */
1405 ret = HEAP_ValidateInUseArena( subheap, arena, QUIET );
1406 else if ((ULONG_PTR)arena % ALIGNMENT != ARENA_OFFSET)
1407 WARN( "Heap %p: unaligned arena pointer %p\n", subheap->heap, arena );
1408 else if (arena->magic == ARENA_PENDING_MAGIC)
1409 WARN( "Heap %p: block %p used after free\n", subheap->heap, arena + 1 );
1410 else if (arena->magic != ARENA_INUSE_MAGIC)
1411 WARN( "Heap %p: invalid in-use arena magic %08x for %p\n", subheap->heap, arena->magic, arena );
1412 else if (arena->size & ARENA_FLAG_FREE)
1413 ERR( "Heap %p: bad flags %08x for in-use arena %p\n",
1414 subheap->heap, arena->size & ~ARENA_SIZE_MASK, arena );
1415 else if ((const char *)(arena + 1) + (arena->size & ARENA_SIZE_MASK) > (const char *)subheap->base + subheap->size ||
1416 (const char *)(arena + 1) + (arena->size & ARENA_SIZE_MASK) < (const char *)(arena + 1))
1417 ERR( "Heap %p: bad size %08x for in-use arena %p\n",
1418 subheap->heap, arena->size & ARENA_SIZE_MASK, arena );
1419 else
1420 ret = TRUE;
1421
1422 return ret;
1423 }
1424
1425
1426 /***********************************************************************
1427 * heap_set_debug_flags
1428 */
1429 void heap_set_debug_flags( HANDLE handle )
1430 {
1431 HEAP *heap = HEAP_GetPtr( handle );
1432 ULONG global_flags = RtlGetNtGlobalFlags();
1433 ULONG flags = 0;
1434
1435 if (TRACE_ON(heap)) global_flags |= FLG_HEAP_VALIDATE_ALL;
1436 if (WARN_ON(heap)) global_flags |= FLG_HEAP_VALIDATE_PARAMETERS;
1437
1438 if (global_flags & FLG_HEAP_ENABLE_TAIL_CHECK) flags |= HEAP_TAIL_CHECKING_ENABLED;
1439 if (global_flags & FLG_HEAP_ENABLE_FREE_CHECK) flags |= HEAP_FREE_CHECKING_ENABLED;
1440 if (global_flags & FLG_HEAP_DISABLE_COALESCING) flags |= HEAP_DISABLE_COALESCE_ON_FREE;
1441 if (global_flags & FLG_HEAP_PAGE_ALLOCS) flags |= HEAP_PAGE_ALLOCS | HEAP_GROWABLE;
1442
1443 if (global_flags & FLG_HEAP_VALIDATE_PARAMETERS)
1444 flags |= HEAP_VALIDATE | HEAP_VALIDATE_PARAMS |
1445 HEAP_TAIL_CHECKING_ENABLED | HEAP_FREE_CHECKING_ENABLED;
1446 if (global_flags & FLG_HEAP_VALIDATE_ALL)
1447 flags |= HEAP_VALIDATE | HEAP_VALIDATE_ALL |
1448 HEAP_TAIL_CHECKING_ENABLED | HEAP_FREE_CHECKING_ENABLED;
1449
1450 if (RUNNING_ON_VALGRIND) flags = 0; /* no sense in validating since Valgrind catches accesses */
1451
1452 heap->flags |= flags;
1453 heap->force_flags |= flags & ~(HEAP_VALIDATE | HEAP_DISABLE_COALESCE_ON_FREE);
1454
1455 if (flags & (HEAP_FREE_CHECKING_ENABLED | HEAP_TAIL_CHECKING_ENABLED)) /* fix existing blocks */
1456 {
1457 SUBHEAP *subheap;
1458 ARENA_LARGE *large;
1459
1460 LIST_FOR_EACH_ENTRY( subheap, &heap->subheap_list, SUBHEAP, entry )
1461 {
1462 char *ptr = (char *)subheap->base + subheap->headerSize;
1463 char *end = (char *)subheap->base + subheap->commitSize;
1464 while (ptr < end)
1465 {
1466 ARENA_INUSE *arena = (ARENA_INUSE *)ptr;
1467 SIZE_T size = arena->size & ARENA_SIZE_MASK;
1468 if (arena->size & ARENA_FLAG_FREE)
1469 {
1470 SIZE_T count = size;
1471
1472 ptr += sizeof(ARENA_FREE) + size;
1473 if (ptr >= end) count = end - (char *)((ARENA_FREE *)arena + 1);
1474 else count -= sizeof(ARENA_FREE *);
1475 mark_block_free( (ARENA_FREE *)arena + 1, count, flags );
1476 }
1477 else
1478 {
1479 if (arena->magic == ARENA_PENDING_MAGIC)
1480 mark_block_free( arena + 1, size, flags );
1481 else
1482 mark_block_tail( (char *)(arena + 1) + size - arena->unused_bytes,
1483 arena->unused_bytes, flags );
1484 ptr += sizeof(ARENA_INUSE) + size;
1485 }
1486 }
1487 }
1488
1489 LIST_FOR_EACH_ENTRY( large, &heap->large_list, ARENA_LARGE, entry )
1490 mark_block_tail( (char *)(large + 1) + large->data_size,
1491 large->block_size - sizeof(*large) - large->data_size, flags );
1492 }
1493
1494 if ((heap->flags & HEAP_GROWABLE) && !heap->pending_free &&
1495 ((flags & HEAP_FREE_CHECKING_ENABLED) || RUNNING_ON_VALGRIND))
1496 {
1497 void *ptr = NULL;
1498 SIZE_T size = MAX_FREE_PENDING * sizeof(*heap->pending_free);
1499
1500 if (!NtAllocateVirtualMemory( NtCurrentProcess(), &ptr, 4, &size, MEM_COMMIT, PAGE_READWRITE ))
1501 {
1502 heap->pending_free = ptr;
1503 heap->pending_pos = 0;
1504 }
1505 }
1506 }
1507
1508
1509 /***********************************************************************
1510 * RtlCreateHeap (NTDLL.@)
1511 *
1512 * Create a new Heap.
1513 *
1514 * PARAMS
1515 * flags [I] HEAP_ flags from "winnt.h"
1516 * addr [I] Desired base address
1517 * totalSize [I] Total size of the heap, or 0 for a growable heap
1518 * commitSize [I] Amount of heap space to commit
1519 * unknown [I] Not yet understood
1520 * definition [I] Heap definition
1521 *
1522 * RETURNS
1523 * Success: A HANDLE to the newly created heap.
1524 * Failure: a NULL HANDLE.
1525 */
1526 HANDLE WINAPI RtlCreateHeap( ULONG flags, PVOID addr, SIZE_T totalSize, SIZE_T commitSize,
1527 PVOID unknown, PRTL_HEAP_DEFINITION definition )
1528 {
1529 SUBHEAP *subheap;
1530
1531 /* Allocate the heap block */
1532
1533 if (!totalSize)
1534 {
1535 totalSize = HEAP_DEF_SIZE;
1536 flags |= HEAP_GROWABLE;
1537 }
1538
1539 if (!(subheap = HEAP_CreateSubHeap( NULL, addr, flags, commitSize, totalSize ))) return 0;
1540
1541 /* link it into the per-process heap list */
1542 if (processHeap)
1543 {
1544 HEAP *heapPtr = subheap->heap;
1545 RtlEnterCriticalSection( &processHeap->critSection );
1546 list_add_head( &processHeap->entry, &heapPtr->entry );
1547 RtlLeaveCriticalSection( &processHeap->critSection );
1548 }
1549 else if (!addr)
1550 {
1551 processHeap = subheap->heap; /* assume the first heap we create is the process main heap */
1552 list_init( &processHeap->entry );
1553 }
1554
1555 heap_set_debug_flags( subheap->heap );
1556 return subheap->heap;
1557 }
1558
1559
1560 /***********************************************************************
1561 * RtlDestroyHeap (NTDLL.@)
1562 *
1563 * Destroy a Heap created with RtlCreateHeap().
1564 *
1565 * PARAMS
1566 * heap [I] Heap to destroy.
1567 *
1568 * RETURNS
1569 * Success: A NULL HANDLE, if heap is NULL or it was destroyed
1570 * Failure: The Heap handle, if heap is the process heap.
1571 */
1572 HANDLE WINAPI RtlDestroyHeap( HANDLE heap )
1573 {
1574 HEAP *heapPtr = HEAP_GetPtr( heap );
1575 SUBHEAP *subheap, *next;
1576 ARENA_LARGE *arena, *arena_next;
1577 SIZE_T size;
1578 void *addr;
1579
1580 TRACE("%p\n", heap );
1581 if (!heapPtr) return heap;
1582
1583 if (heap == processHeap) return heap; /* cannot delete the main process heap */
1584
1585 /* remove it from the per-process list */
1586 RtlEnterCriticalSection( &processHeap->critSection );
1587 list_remove( &heapPtr->entry );
1588 RtlLeaveCriticalSection( &processHeap->critSection );
1589
1590 heapPtr->critSection.DebugInfo->Spare[0] = 0;
1591 RtlDeleteCriticalSection( &heapPtr->critSection );
1592
1593 LIST_FOR_EACH_ENTRY_SAFE( arena, arena_next, &heapPtr->large_list, ARENA_LARGE, entry )
1594 {
1595 list_remove( &arena->entry );
1596 size = 0;
1597 addr = arena;
1598 NtFreeVirtualMemory( NtCurrentProcess(), &addr, &size, MEM_RELEASE );
1599 }
1600 LIST_FOR_EACH_ENTRY_SAFE( subheap, next, &heapPtr->subheap_list, SUBHEAP, entry )
1601 {
1602 if (subheap == &heapPtr->subheap) continue; /* do this one last */
1603 subheap_notify_free_all(subheap);
1604 list_remove( &subheap->entry );
1605 size = 0;
1606 addr = subheap->base;
1607 NtFreeVirtualMemory( NtCurrentProcess(), &addr, &size, MEM_RELEASE );
1608 }
1609 subheap_notify_free_all(&heapPtr->subheap);
1610 if (heapPtr->pending_free)
1611 {
1612 size = 0;
1613 addr = heapPtr->pending_free;
1614 NtFreeVirtualMemory( NtCurrentProcess(), &addr, &size, MEM_RELEASE );
1615 }
1616 size = 0;
1617 addr = heapPtr->subheap.base;
1618 NtFreeVirtualMemory( NtCurrentProcess(), &addr, &size, MEM_RELEASE );
1619 return 0;
1620 }
1621
1622
1623 /***********************************************************************
1624 * RtlAllocateHeap (NTDLL.@)
1625 *
1626 * Allocate a memory block from a Heap.
1627 *
1628 * PARAMS
1629 * heap [I] Heap to allocate block from
1630 * flags [I] HEAP_ flags from "winnt.h"
1631 * size [I] Size of the memory block to allocate
1632 *
1633 * RETURNS
1634 * Success: A pointer to the newly allocated block
1635 * Failure: NULL.
1636 *
1637 * NOTES
1638 * This call does not SetLastError().
1639 */
1640 PVOID WINAPI RtlAllocateHeap( HANDLE heap, ULONG flags, SIZE_T size )
1641 {
1642 ARENA_FREE *pArena;
1643 ARENA_INUSE *pInUse;
1644 SUBHEAP *subheap;
1645 HEAP *heapPtr = HEAP_GetPtr( heap );
1646 SIZE_T rounded_size;
1647
1648 /* Validate the parameters */
1649
1650 if (!heapPtr) return NULL;
1651 flags &= HEAP_GENERATE_EXCEPTIONS | HEAP_NO_SERIALIZE | HEAP_ZERO_MEMORY;
1652 flags |= heapPtr->flags;
1653 rounded_size = ROUND_SIZE(size) + HEAP_TAIL_EXTRA_SIZE( flags );
1654 if (rounded_size < size) /* overflow */
1655 {
1656 if (flags & HEAP_GENERATE_EXCEPTIONS) RtlRaiseStatus( STATUS_NO_MEMORY );
1657 return NULL;
1658 }
1659 if (rounded_size < HEAP_MIN_DATA_SIZE) rounded_size = HEAP_MIN_DATA_SIZE;
1660
1661 if (!(flags & HEAP_NO_SERIALIZE)) RtlEnterCriticalSection( &heapPtr->critSection );
1662
1663 if (rounded_size >= HEAP_MIN_LARGE_BLOCK_SIZE && (flags & HEAP_GROWABLE))
1664 {
1665 void *ret = allocate_large_block( heap, flags, size );
1666 if (!(flags & HEAP_NO_SERIALIZE)) RtlLeaveCriticalSection( &heapPtr->critSection );
1667 if (!ret && (flags & HEAP_GENERATE_EXCEPTIONS)) RtlRaiseStatus( STATUS_NO_MEMORY );
1668 TRACE("(%p,%08x,%08lx): returning %p\n", heap, flags, size, ret );
1669 return ret;
1670 }
1671
1672 /* Locate a suitable free block */
1673
1674 if (!(pArena = HEAP_FindFreeBlock( heapPtr, rounded_size, &subheap )))
1675 {
1676 TRACE("(%p,%08x,%08lx): returning NULL\n",
1677 heap, flags, size );
1678 if (!(flags & HEAP_NO_SERIALIZE)) RtlLeaveCriticalSection( &heapPtr->critSection );
1679 if (flags & HEAP_GENERATE_EXCEPTIONS) RtlRaiseStatus( STATUS_NO_MEMORY );
1680 return NULL;
1681 }
1682
1683 /* Remove the arena from the free list */
1684
1685 list_remove( &pArena->entry );
1686
1687 /* Build the in-use arena */
1688
1689 pInUse = (ARENA_INUSE *)pArena;
1690
1691 /* in-use arena is smaller than free arena,
1692 * so we have to add the difference to the size */
1693 pInUse->size = (pInUse->size & ~ARENA_FLAG_FREE) + sizeof(ARENA_FREE) - sizeof(ARENA_INUSE);
1694 pInUse->magic = ARENA_INUSE_MAGIC;
1695
1696 /* Shrink the block */
1697
1698 HEAP_ShrinkBlock( subheap, pInUse, rounded_size );
1699 pInUse->unused_bytes = (pInUse->size & ARENA_SIZE_MASK) - size;
1700
1701 notify_alloc( pInUse + 1, size, flags & HEAP_ZERO_MEMORY );
1702 initialize_block( pInUse + 1, size, pInUse->unused_bytes, flags );
1703
1704 if (!(flags & HEAP_NO_SERIALIZE)) RtlLeaveCriticalSection( &heapPtr->critSection );
1705
1706 TRACE("(%p,%08x,%08lx): returning %p\n", heap, flags, size, pInUse + 1 );
1707 return pInUse + 1;
1708 }
1709
1710
1711 /***********************************************************************
1712 * RtlFreeHeap (NTDLL.@)
1713 *
1714 * Free a memory block allocated with RtlAllocateHeap().
1715 *
1716 * PARAMS
1717 * heap [I] Heap that block was allocated from
1718 * flags [I] HEAP_ flags from "winnt.h"
1719 * ptr [I] Block to free
1720 *
1721 * RETURNS
1722 * Success: TRUE, if ptr is NULL or was freed successfully.
1723 * Failure: FALSE.
1724 */
1725 BOOLEAN WINAPI RtlFreeHeap( HANDLE heap, ULONG flags, PVOID ptr )
1726 {
1727 ARENA_INUSE *pInUse;
1728 SUBHEAP *subheap;
1729 HEAP *heapPtr;
1730
1731 /* Validate the parameters */
1732
1733 if (!ptr) return TRUE; /* freeing a NULL ptr isn't an error in Win2k */
1734
1735 heapPtr = HEAP_GetPtr( heap );
1736 if (!heapPtr)
1737 {
1738 RtlSetLastWin32ErrorAndNtStatusFromNtStatus( STATUS_INVALID_HANDLE );
1739 return FALSE;
1740 }
1741
1742 flags &= HEAP_NO_SERIALIZE;
1743 flags |= heapPtr->flags;
1744 if (!(flags & HEAP_NO_SERIALIZE)) RtlEnterCriticalSection( &heapPtr->critSection );
1745
1746 /* Inform valgrind we are trying to free memory, so it can throw up an error message */
1747 notify_free( ptr );
1748
1749 /* Some sanity checks */
1750 pInUse = (ARENA_INUSE *)ptr - 1;
1751 if (!validate_block_pointer( heapPtr, &subheap, pInUse )) goto error;
1752
1753 if (!subheap)
1754 free_large_block( heapPtr, flags, ptr );
1755 else
1756 HEAP_MakeInUseBlockFree( subheap, pInUse );
1757
1758 if (!(flags & HEAP_NO_SERIALIZE)) RtlLeaveCriticalSection( &heapPtr->critSection );
1759 TRACE("(%p,%08x,%p): returning TRUE\n", heap, flags, ptr );
1760 return TRUE;
1761
1762 error:
1763 if (!(flags & HEAP_NO_SERIALIZE)) RtlLeaveCriticalSection( &heapPtr->critSection );
1764 RtlSetLastWin32ErrorAndNtStatusFromNtStatus( STATUS_INVALID_PARAMETER );
1765 TRACE("(%p,%08x,%p): returning FALSE\n", heap, flags, ptr );
1766 return FALSE;
1767 }
1768
1769
1770 /***********************************************************************
1771 * RtlReAllocateHeap (NTDLL.@)
1772 *
1773 * Change the size of a memory block allocated with RtlAllocateHeap().
1774 *
1775 * PARAMS
1776 * heap [I] Heap that block was allocated from
1777 * flags [I] HEAP_ flags from "winnt.h"
1778 * ptr [I] Block to resize
1779 * size [I] Size of the memory block to allocate
1780 *
1781 * RETURNS
1782 * Success: A pointer to the resized block (which may be different).
1783 * Failure: NULL.
1784 */
1785 PVOID WINAPI RtlReAllocateHeap( HANDLE heap, ULONG flags, PVOID ptr, SIZE_T size )
1786 {
1787 ARENA_INUSE *pArena;
1788 HEAP *heapPtr;
1789 SUBHEAP *subheap;
1790 SIZE_T oldBlockSize, oldActualSize, rounded_size;
1791 void *ret;
1792
1793 if (!ptr) return NULL;
1794 if (!(heapPtr = HEAP_GetPtr( heap )))
1795 {
1796 RtlSetLastWin32ErrorAndNtStatusFromNtStatus( STATUS_INVALID_HANDLE );
1797 return NULL;
1798 }
1799
1800 /* Validate the parameters */
1801
1802 flags &= HEAP_GENERATE_EXCEPTIONS | HEAP_NO_SERIALIZE | HEAP_ZERO_MEMORY |
1803 HEAP_REALLOC_IN_PLACE_ONLY;
1804 flags |= heapPtr->flags;
1805 if (!(flags & HEAP_NO_SERIALIZE)) RtlEnterCriticalSection( &heapPtr->critSection );
1806
1807 rounded_size = ROUND_SIZE(size) + HEAP_TAIL_EXTRA_SIZE(flags);
1808 if (rounded_size < size) goto oom; /* overflow */
1809 if (rounded_size < HEAP_MIN_DATA_SIZE) rounded_size = HEAP_MIN_DATA_SIZE;
1810
1811 pArena = (ARENA_INUSE *)ptr - 1;
1812 if (!validate_block_pointer( heapPtr, &subheap, pArena )) goto error;
1813 if (!subheap)
1814 {
1815 if (!(ret = realloc_large_block( heapPtr, flags, ptr, size ))) goto oom;
1816 goto done;
1817 }
1818
1819 /* Check if we need to grow the block */
1820
1821 oldBlockSize = (pArena->size & ARENA_SIZE_MASK);
1822 oldActualSize = (pArena->size & ARENA_SIZE_MASK) - pArena->unused_bytes;
1823 if (rounded_size > oldBlockSize)
1824 {
1825 char *pNext = (char *)(pArena + 1) + oldBlockSize;
1826
1827 if (rounded_size >= HEAP_MIN_LARGE_BLOCK_SIZE && (flags & HEAP_GROWABLE))
1828 {
1829 if (flags & HEAP_REALLOC_IN_PLACE_ONLY) goto oom;
1830 if (!(ret = allocate_large_block( heapPtr, flags, size ))) goto oom;
1831 memcpy( ret, pArena + 1, oldActualSize );
1832 notify_free( pArena + 1 );
1833 HEAP_MakeInUseBlockFree( subheap, pArena );
1834 goto done;
1835 }
1836 if ((pNext < (char *)subheap->base + subheap->size) &&
1837 (*(DWORD *)pNext & ARENA_FLAG_FREE) &&
1838 (oldBlockSize + (*(DWORD *)pNext & ARENA_SIZE_MASK) + sizeof(ARENA_FREE) >= rounded_size))
1839 {
1840 /* The next block is free and large enough */
1841 ARENA_FREE *pFree = (ARENA_FREE *)pNext;
1842 list_remove( &pFree->entry );
1843 pArena->size += (pFree->size & ARENA_SIZE_MASK) + sizeof(*pFree);
1844 if (!HEAP_Commit( subheap, pArena, rounded_size )) goto oom;
1845 notify_free( pArena + 1 );
1846 HEAP_ShrinkBlock( subheap, pArena, rounded_size );
1847 notify_alloc( pArena + 1, size, FALSE );
1848 /* FIXME: this is wrong as we may lose old VBits settings */
1849 mark_block_initialized( pArena + 1, oldActualSize );
1850 }
1851 else /* Do it the hard way */
1852 {
1853 ARENA_FREE *pNew;
1854 ARENA_INUSE *pInUse;
1855 SUBHEAP *newsubheap;
1856
1857 if ((flags & HEAP_REALLOC_IN_PLACE_ONLY) ||
1858 !(pNew = HEAP_FindFreeBlock( heapPtr, rounded_size, &newsubheap )))
1859 goto oom;
1860
1861 /* Build the in-use arena */
1862
1863 list_remove( &pNew->entry );
1864 pInUse = (ARENA_INUSE *)pNew;
1865 pInUse->size = (pInUse->size & ~ARENA_FLAG_FREE)
1866 + sizeof(ARENA_FREE) - sizeof(ARENA_INUSE);
1867 pInUse->magic = ARENA_INUSE_MAGIC;
1868 HEAP_ShrinkBlock( newsubheap, pInUse, rounded_size );
1869
1870 mark_block_initialized( pInUse + 1, oldActualSize );
1871 notify_alloc( pInUse + 1, size, FALSE );
1872 memcpy( pInUse + 1, pArena + 1, oldActualSize );
1873
1874 /* Free the previous block */
1875
1876 notify_free( pArena + 1 );
1877 HEAP_MakeInUseBlockFree( subheap, pArena );
1878 subheap = newsubheap;
1879 pArena = pInUse;
1880 }
1881 }
1882 else
1883 {
1884 /* Shrink the block */
1885 notify_free( pArena + 1 );
1886 HEAP_ShrinkBlock( subheap, pArena, rounded_size );
1887 notify_alloc( pArena + 1, size, FALSE );
1888 /* FIXME: this is wrong as we may lose old VBits settings */
1889 mark_block_initialized( pArena + 1, size );
1890 }
1891
1892 pArena->unused_bytes = (pArena->size & ARENA_SIZE_MASK) - size;
1893
1894 /* Clear the extra bytes if needed */
1895
1896 if (size > oldActualSize)
1897 initialize_block( (char *)(pArena + 1) + oldActualSize, size - oldActualSize,
1898 pArena->unused_bytes, flags );
1899 else
1900 mark_block_tail( (char *)(pArena + 1) + size, pArena->unused_bytes, flags );
1901
1902 /* Return the new arena */
1903
1904 ret = pArena + 1;
1905 done:
1906 if (!(flags & HEAP_NO_SERIALIZE)) RtlLeaveCriticalSection( &heapPtr->critSection );
1907 TRACE("(%p,%08x,%p,%08lx): returning %p\n", heap, flags, ptr, size, ret );
1908 return ret;
1909
1910 oom:
1911 if (!(flags & HEAP_NO_SERIALIZE)) RtlLeaveCriticalSection( &heapPtr->critSection );
1912 if (flags & HEAP_GENERATE_EXCEPTIONS) RtlRaiseStatus( STATUS_NO_MEMORY );
1913 RtlSetLastWin32ErrorAndNtStatusFromNtStatus( STATUS_NO_MEMORY );
1914 TRACE("(%p,%08x,%p,%08lx): returning NULL\n", heap, flags, ptr, size );
1915 return NULL;
1916
1917 error:
1918 if (!(flags & HEAP_NO_SERIALIZE)) RtlLeaveCriticalSection( &heapPtr->critSection );
1919 RtlSetLastWin32ErrorAndNtStatusFromNtStatus( STATUS_INVALID_PARAMETER );
1920 TRACE("(%p,%08x,%p,%08lx): returning NULL\n", heap, flags, ptr, size );
1921 return NULL;
1922 }
1923
1924
1925 /***********************************************************************
1926 * RtlCompactHeap (NTDLL.@)
1927 *
1928 * Compact the free space in a Heap.
1929 *
1930 * PARAMS
1931 * heap [I] Heap that block was allocated from
1932 * flags [I] HEAP_ flags from "winnt.h"
1933 *
1934 * RETURNS
1935 * The number of bytes compacted.
1936 *
1937 * NOTES
1938 * This function is a harmless stub.
1939 */
1940 ULONG WINAPI RtlCompactHeap( HANDLE heap, ULONG flags )
1941 {
1942 static BOOL reported;
1943 if (!reported++) FIXME( "(%p, 0x%x) stub\n", heap, flags );
1944 return 0;
1945 }
1946
1947
1948 /***********************************************************************
1949 * RtlLockHeap (NTDLL.@)
1950 *
1951 * Lock a Heap.
1952 *
1953 * PARAMS
1954 * heap [I] Heap to lock
1955 *
1956 * RETURNS
1957 * Success: TRUE. The Heap is locked.
1958 * Failure: FALSE, if heap is invalid.
1959 */
1960 BOOLEAN WINAPI RtlLockHeap( HANDLE heap )
1961 {
1962 HEAP *heapPtr = HEAP_GetPtr( heap );
1963 if (!heapPtr) return FALSE;
1964 RtlEnterCriticalSection( &heapPtr->critSection );
1965 return TRUE;
1966 }
1967
1968
1969 /***********************************************************************
1970 * RtlUnlockHeap (NTDLL.@)
1971 *
1972 * Unlock a Heap.
1973 *
1974 * PARAMS
1975 * heap [I] Heap to unlock
1976 *
1977 * RETURNS
1978 * Success: TRUE. The Heap is unlocked.
1979 * Failure: FALSE, if heap is invalid.
1980 */
1981 BOOLEAN WINAPI RtlUnlockHeap( HANDLE heap )
1982 {
1983 HEAP *heapPtr = HEAP_GetPtr( heap );
1984 if (!heapPtr) return FALSE;
1985 RtlLeaveCriticalSection( &heapPtr->critSection );
1986 return TRUE;
1987 }
1988
1989
1990 /***********************************************************************
1991 * RtlSizeHeap (NTDLL.@)
1992 *
1993 * Get the actual size of a memory block allocated from a Heap.
1994 *
1995 * PARAMS
1996 * heap [I] Heap that block was allocated from
1997 * flags [I] HEAP_ flags from "winnt.h"
1998 * ptr [I] Block to get the size of
1999 *
2000 * RETURNS
2001 * Success: The size of the block.
2002 * Failure: -1, heap or ptr are invalid.
2003 *
2004 * NOTES
2005 * The size may be bigger than what was passed to RtlAllocateHeap().
2006 */
2007 SIZE_T WINAPI RtlSizeHeap( HANDLE heap, ULONG flags, const void *ptr )
2008 {
2009 SIZE_T ret;
2010 const ARENA_INUSE *pArena;
2011 SUBHEAP *subheap;
2012 HEAP *heapPtr = HEAP_GetPtr( heap );
2013
2014 if (!heapPtr)
2015 {
2016 RtlSetLastWin32ErrorAndNtStatusFromNtStatus( STATUS_INVALID_HANDLE );
2017 return ~0UL;
2018 }
2019 flags &= HEAP_NO_SERIALIZE;
2020 flags |= heapPtr->flags;
2021 if (!(flags & HEAP_NO_SERIALIZE)) RtlEnterCriticalSection( &heapPtr->critSection );
2022
2023 pArena = (const ARENA_INUSE *)ptr - 1;
2024 if (!validate_block_pointer( heapPtr, &subheap, pArena ))
2025 {
2026 RtlSetLastWin32ErrorAndNtStatusFromNtStatus( STATUS_INVALID_PARAMETER );
2027 ret = ~0UL;
2028 }
2029 else if (!subheap)
2030 {
2031 const ARENA_LARGE *large_arena = (const ARENA_LARGE *)ptr - 1;
2032 ret = large_arena->data_size;
2033 }
2034 else
2035 {
2036 ret = (pArena->size & ARENA_SIZE_MASK) - pArena->unused_bytes;
2037 }
2038 if (!(flags & HEAP_NO_SERIALIZE)) RtlLeaveCriticalSection( &heapPtr->critSection );
2039
2040 TRACE("(%p,%08x,%p): returning %08lx\n", heap, flags, ptr, ret );
2041 return ret;
2042 }
2043
2044
2045 /***********************************************************************
2046 * RtlValidateHeap (NTDLL.@)
2047 *
2048 * Determine if a block is a valid allocation from a heap.
2049 *
2050 * PARAMS
2051 * heap [I] Heap that block was allocated from
2052 * flags [I] HEAP_ flags from "winnt.h"
2053 * ptr [I] Block to check
2054 *
2055 * RETURNS
2056 * Success: TRUE. The block was allocated from heap.
2057 * Failure: FALSE, if heap is invalid or ptr was not allocated from it.
2058 */
2059 BOOLEAN WINAPI RtlValidateHeap( HANDLE heap, ULONG flags, LPCVOID ptr )
2060 {
2061 HEAP *heapPtr = HEAP_GetPtr( heap );
2062 if (!heapPtr) return FALSE;
2063 return HEAP_IsRealArena( heapPtr, flags, ptr, QUIET );
2064 }
2065
2066
2067 /***********************************************************************
2068 * RtlWalkHeap (NTDLL.@)
2069 *
2070 * FIXME
2071 * The PROCESS_HEAP_ENTRY flag values seem different between this
2072 * function and HeapWalk(). To be checked.
2073 */
2074 NTSTATUS WINAPI RtlWalkHeap( HANDLE heap, PVOID entry_ptr )
2075 {
2076 LPPROCESS_HEAP_ENTRY entry = entry_ptr; /* FIXME */
2077 HEAP *heapPtr = HEAP_GetPtr(heap);
2078 SUBHEAP *sub, *currentheap = NULL;
2079 NTSTATUS ret;
2080 char *ptr;
2081 int region_index = 0;
2082
2083 if (!heapPtr || !entry) return STATUS_INVALID_PARAMETER;
2084
2085 if (!(heapPtr->flags & HEAP_NO_SERIALIZE)) RtlEnterCriticalSection( &heapPtr->critSection );
2086
2087 /* FIXME: enumerate large blocks too */
2088
2089 /* set ptr to the next arena to be examined */
2090
2091 if (!entry->lpData) /* first call (init) ? */
2092 {
2093 TRACE("begin walking of heap %p.\n", heap);
2094 currentheap = &heapPtr->subheap;
2095 ptr = (char*)currentheap->base + currentheap->headerSize;
2096 }
2097 else
2098 {
2099 ptr = entry->lpData;
2100 LIST_FOR_EACH_ENTRY( sub, &heapPtr->subheap_list, SUBHEAP, entry )
2101 {
2102 if ((ptr >= (char *)sub->base) &&
2103 (ptr < (char *)sub->base + sub->size))
2104 {
2105 currentheap = sub;
2106 break;
2107 }
2108 region_index++;
2109 }
2110 if (currentheap == NULL)
2111 {
2112 ERR("no matching subheap found, shouldn't happen !\n");
2113 ret = STATUS_NO_MORE_ENTRIES;
2114 goto HW_end;
2115 }
2116
2117 if (((ARENA_INUSE *)ptr - 1)->magic == ARENA_INUSE_MAGIC ||
2118 ((ARENA_INUSE *)ptr - 1)->magic == ARENA_PENDING_MAGIC)
2119 {
2120 ARENA_INUSE *pArena = (ARENA_INUSE *)ptr - 1;
2121 ptr += pArena->size & ARENA_SIZE_MASK;
2122 }
2123 else if (((ARENA_FREE *)ptr - 1)->magic == ARENA_FREE_MAGIC)
2124 {
2125 ARENA_FREE *pArena = (ARENA_FREE *)ptr - 1;
2126 ptr += pArena->size & ARENA_SIZE_MASK;
2127 }
2128 else
2129 ptr += entry->cbData; /* point to next arena */
2130
2131 if (ptr > (char *)currentheap->base + currentheap->size - 1)
2132 { /* proceed with next subheap */
2133 struct list *next = list_next( &heapPtr->subheap_list, &currentheap->entry );
2134 if (!next)
2135 { /* successfully finished */
2136 TRACE("end reached.\n");
2137 ret = STATUS_NO_MORE_ENTRIES;
2138 goto HW_end;
2139 }
2140 currentheap = LIST_ENTRY( next, SUBHEAP, entry );
2141 ptr = (char *)currentheap->base + currentheap->headerSize;
2142 }
2143 }
2144
2145 entry->wFlags = 0;
2146 if (*(DWORD *)ptr & ARENA_FLAG_FREE)
2147 {
2148 ARENA_FREE *pArena = (ARENA_FREE *)ptr;
2149
2150 /*TRACE("free, magic: %04x\n", pArena->magic);*/
2151
2152 entry->lpData = pArena + 1;
2153 entry->cbData = pArena->size & ARENA_SIZE_MASK;
2154 entry->cbOverhead = sizeof(ARENA_FREE);
2155 entry->wFlags = PROCESS_HEAP_UNCOMMITTED_RANGE;
2156 }
2157 else
2158 {
2159 ARENA_INUSE *pArena = (ARENA_INUSE *)ptr;
2160
2161 /*TRACE("busy, magic: %04x\n", pArena->magic);*/
2162
2163 entry->lpData = pArena + 1;
2164 entry->cbData = pArena->size & ARENA_SIZE_MASK;
2165 entry->cbOverhead = sizeof(ARENA_INUSE);
2166 entry->wFlags = (pArena->magic == ARENA_PENDING_MAGIC) ?
2167 PROCESS_HEAP_UNCOMMITTED_RANGE : PROCESS_HEAP_ENTRY_BUSY;
2168 /* FIXME: can't handle PROCESS_HEAP_ENTRY_MOVEABLE
2169 and PROCESS_HEAP_ENTRY_DDESHARE yet */
2170 }
2171
2172 entry->iRegionIndex = region_index;
2173
2174 /* first element of heap ? */
2175 if (ptr == (char *)currentheap->base + currentheap->headerSize)
2176 {
2177 entry->wFlags |= PROCESS_HEAP_REGION;
2178 entry->u.Region.dwCommittedSize = currentheap->commitSize;
2179 entry->u.Region.dwUnCommittedSize =
2180 currentheap->size - currentheap->commitSize;
2181 entry->u.Region.lpFirstBlock = /* first valid block */
2182 (char *)currentheap->base + currentheap->headerSize;
2183 entry->u.Region.lpLastBlock = /* first invalid block */
2184 (char *)currentheap->base + currentheap->size;
2185 }
2186 ret = STATUS_SUCCESS;
2187 if (TRACE_ON(heap)) HEAP_DumpEntry(entry);
2188
2189 HW_end:
2190 if (!(heapPtr->flags & HEAP_NO_SERIALIZE)) RtlLeaveCriticalSection( &heapPtr->critSection );
2191 return ret;
2192 }
2193
2194
2195 /***********************************************************************
2196 * RtlGetProcessHeaps (NTDLL.@)
2197 *
2198 * Get the Heaps belonging to the current process.
2199 *
2200 * PARAMS
2201 * count [I] size of heaps
2202 * heaps [O] Destination array for heap HANDLE's
2203 *
2204 * RETURNS
2205 * Success: The number of Heaps allocated by the process.
2206 * Failure: 0.
2207 */
2208 ULONG WINAPI RtlGetProcessHeaps( ULONG count, HANDLE *heaps )
2209 {
2210 ULONG total = 1; /* main heap */
2211 struct list *ptr;
2212
2213 RtlEnterCriticalSection( &processHeap->critSection );
2214 LIST_FOR_EACH( ptr, &processHeap->entry ) total++;
2215 if (total <= count)
2216 {
2217 *heaps++ = processHeap;
2218 LIST_FOR_EACH( ptr, &processHeap->entry )
2219 *heaps++ = LIST_ENTRY( ptr, HEAP, entry );
2220 }
2221 RtlLeaveCriticalSection( &processHeap->critSection );
2222 return total;
2223 }
2224
2225 /***********************************************************************
2226 * RtlQueryHeapInformation (NTDLL.@)
2227 */
2228 NTSTATUS WINAPI RtlQueryHeapInformation( HANDLE heap, HEAP_INFORMATION_CLASS info_class,
2229 PVOID info, SIZE_T size_in, PSIZE_T size_out)
2230 {
2231 switch (info_class)
2232 {
2233 case HeapCompatibilityInformation:
2234 if (size_out) *size_out = sizeof(ULONG);
2235
2236 if (size_in < sizeof(ULONG))
2237 return STATUS_BUFFER_TOO_SMALL;
2238
2239 *(ULONG *)info = 0; /* standard heap */
2240 return STATUS_SUCCESS;
2241
2242 default:
2243 FIXME("Unknown heap information class %u\n", info_class);
2244 return STATUS_INVALID_INFO_CLASS;
2245 }
2246 }
useful hacks and other patches not (yet) suitable for mainline