heap.c 52 KB
Newer Older
1 2 3 4 5
/*
 * Win32 heap functions
 *
 * Copyright 1996 Alexandre Julliard
 * Copyright 1998 Ulrich Weigand
6 7 8 9 10 11 12 13 14 15 16 17 18 19
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
20 21 22 23 24 25
 */

#include "config.h"

#include <assert.h>
#include <stdlib.h>
26
#include <stdarg.h>
27 28
#include <stdio.h>
#include <string.h>
29 30 31
#ifdef HAVE_VALGRIND_MEMCHECK_H
#include <valgrind/memcheck.h>
#endif
32

33 34
#define NONAMELESSUNION
#define NONAMELESSSTRUCT
35 36 37 38
#include "ntstatus.h"
#include "windef.h"
#include "winbase.h"
#include "winreg.h"
39
#include "winternl.h"
40 41 42 43
#include "wine/winbase16.h"
#include "winerror.h"
#include "winnt.h"
#include "thread.h"
44
#include "wine/debug.h"
45 46
#include "winternl.h"
#include "wine/server_protocol.h"
47

48
WINE_DEFAULT_DEBUG_CHANNEL(heap);
49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78

/* Note: the heap data structures are based on what Pietrek describes in his
 * book 'Windows 95 System Programming Secrets'. The layout is not exactly
 * the same, but could be easily adapted if it turns out some programs
 * require it.
 */

typedef struct tagARENA_INUSE
{
    DWORD  size;                    /* Block size; must be the first field */
    DWORD  magic;                   /* Magic number */
} ARENA_INUSE;

typedef struct tagARENA_FREE
{
    DWORD                 size;     /* Block size; must be the first field */
    DWORD                 magic;    /* Magic number */
    struct tagARENA_FREE *next;     /* Next free arena */
    struct tagARENA_FREE *prev;     /* Prev free arena */
} ARENA_FREE;

#define ARENA_FLAG_FREE        0x00000001  /* flags OR'ed with arena size */
#define ARENA_FLAG_PREV_FREE   0x00000002
#define ARENA_SIZE_MASK        (~3)
#define ARENA_INUSE_MAGIC      0x44455355      /* Value for arena 'magic' field */
#define ARENA_FREE_MAGIC       0x45455246      /* Value for arena 'magic' field */

#define ARENA_INUSE_FILLER     0x55
#define ARENA_FREE_FILLER      0xaa

79 80 81
#define ALIGNMENT              8   /* everything is aligned on 8 byte boundaries */
#define ROUND_SIZE(size)       (((size) + ALIGNMENT - 1) & ~(ALIGNMENT-1))

82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137
#define QUIET                  1           /* Suppress messages  */
#define NOISY                  0           /* Report all errors  */

#define HEAP_NB_FREE_LISTS   4   /* Number of free lists */

/* Max size of the blocks on the free lists */
static const DWORD HEAP_freeListSizes[HEAP_NB_FREE_LISTS] =
{
    0x20, 0x80, 0x200, ~0UL
};

typedef struct
{
    DWORD       size;
    ARENA_FREE  arena;
} FREE_LIST_ENTRY;

struct tagHEAP;

typedef struct tagSUBHEAP
{
    DWORD               size;       /* Size of the whole sub-heap */
    DWORD               commitSize; /* Committed size of the sub-heap */
    DWORD               headerSize; /* Size of the heap header */
    struct tagSUBHEAP  *next;       /* Next sub-heap */
    struct tagHEAP     *heap;       /* Main heap structure */
    DWORD               magic;      /* Magic number */
} SUBHEAP;

#define SUBHEAP_MAGIC    ((DWORD)('S' | ('U'<<8) | ('B'<<16) | ('H'<<24)))

typedef struct tagHEAP
{
    SUBHEAP          subheap;       /* First sub-heap */
    struct tagHEAP  *next;          /* Next heap for this process */
    CRITICAL_SECTION critSection;   /* Critical section for serialization */
    FREE_LIST_ENTRY  freeList[HEAP_NB_FREE_LISTS];  /* Free lists */
    DWORD            flags;         /* Heap flags */
    DWORD            magic;         /* Magic number */
} HEAP;

#define HEAP_MAGIC       ((DWORD)('H' | ('E'<<8) | ('A'<<16) | ('P'<<24)))

#define HEAP_DEF_SIZE        0x110000   /* Default heap size = 1Mb + 64Kb */
#define HEAP_MIN_BLOCK_SIZE  (8+sizeof(ARENA_FREE))  /* Min. heap block size */
#define COMMIT_MASK          0xffff  /* bitmask for commit/decommit granularity */

static HANDLE processHeap;  /* main process heap */

static HEAP *firstHeap;     /* head of secondary heaps list */

static BOOL HEAP_IsRealArena( HEAP *heapPtr, DWORD flags, LPCVOID block, BOOL quiet );

/* SetLastError for ntdll */
inline static void set_status( NTSTATUS status )
{
138
    NtCurrentTeb()->LastErrorValue = RtlNtStatusToDosError( status );
139 140
}

141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179
/* mark a block of memory as free for debugging purposes */
static inline void mark_block_free( void *ptr, size_t size )
{
    if (TRACE_ON(heap)) memset( ptr, ARENA_FREE_FILLER, size );
#ifdef VALGRIND_MAKE_NOACCESS
    VALGRIND_DISCARD( VALGRIND_MAKE_NOACCESS( ptr, size ));
#endif
}

/* mark a block of memory as initialized for debugging purposes */
static inline void mark_block_initialized( void *ptr, size_t size )
{
#ifdef VALGRIND_MAKE_READABLE
    VALGRIND_DISCARD( VALGRIND_MAKE_READABLE( ptr, size ));
#endif
}

/* mark a block of memory as uninitialized for debugging purposes */
static inline void mark_block_uninitialized( void *ptr, size_t size )
{
#ifdef VALGRIND_MAKE_WRITABLE
    VALGRIND_DISCARD( VALGRIND_MAKE_WRITABLE( ptr, size ));
#endif
    if (TRACE_ON(heap))
    {
        memset( ptr, ARENA_INUSE_FILLER, size );
#ifdef VALGRIND_MAKE_WRITABLE
        /* make it uninitialized to valgrind again */
        VALGRIND_DISCARD( VALGRIND_MAKE_WRITABLE( ptr, size ));
#endif
    }
}

/* clear contents of a block of memory */
static inline void clear_block( void *ptr, size_t size )
{
    mark_block_initialized( ptr, size );
    memset( ptr, 0, size );
}
180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202

/***********************************************************************
 *           HEAP_Dump
 */
void HEAP_Dump( HEAP *heap )
{
    int i;
    SUBHEAP *subheap;
    char *ptr;

    DPRINTF( "Heap: %08lx\n", (DWORD)heap );
    DPRINTF( "Next: %08lx  Sub-heaps: %08lx",
	  (DWORD)heap->next, (DWORD)&heap->subheap );
    subheap = &heap->subheap;
    while (subheap->next)
    {
        DPRINTF( " -> %08lx", (DWORD)subheap->next );
        subheap = subheap->next;
    }

    DPRINTF( "\nFree lists:\n Block   Stat   Size    Id\n" );
    for (i = 0; i < HEAP_NB_FREE_LISTS; i++)
        DPRINTF( "%08lx free %08lx prev=%08lx next=%08lx\n",
Alexandre Julliard's avatar
Alexandre Julliard committed
203
	      (DWORD)&heap->freeList[i].arena, heap->freeList[i].size,
204 205 206 207 208 209 210 211 212
	      (DWORD)heap->freeList[i].arena.prev,
	      (DWORD)heap->freeList[i].arena.next );

    subheap = &heap->subheap;
    while (subheap)
    {
        DWORD freeSize = 0, usedSize = 0, arenaSize = subheap->headerSize;
        DPRINTF( "\n\nSub-heap %08lx: size=%08lx committed=%08lx\n",
	      (DWORD)subheap, subheap->size, subheap->commitSize );
213

214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266
        DPRINTF( "\n Block   Stat   Size    Id\n" );
        ptr = (char*)subheap + subheap->headerSize;
        while (ptr < (char *)subheap + subheap->size)
        {
            if (*(DWORD *)ptr & ARENA_FLAG_FREE)
            {
                ARENA_FREE *pArena = (ARENA_FREE *)ptr;
                DPRINTF( "%08lx free %08lx prev=%08lx next=%08lx\n",
		      (DWORD)pArena, pArena->size & ARENA_SIZE_MASK,
		      (DWORD)pArena->prev, (DWORD)pArena->next);
                ptr += sizeof(*pArena) + (pArena->size & ARENA_SIZE_MASK);
                arenaSize += sizeof(ARENA_FREE);
                freeSize += pArena->size & ARENA_SIZE_MASK;
            }
            else if (*(DWORD *)ptr & ARENA_FLAG_PREV_FREE)
            {
                ARENA_INUSE *pArena = (ARENA_INUSE *)ptr;
                DPRINTF( "%08lx Used %08lx back=%08lx\n",
                         (DWORD)pArena, pArena->size & ARENA_SIZE_MASK, *((DWORD *)pArena - 1) );
                ptr += sizeof(*pArena) + (pArena->size & ARENA_SIZE_MASK);
                arenaSize += sizeof(ARENA_INUSE);
                usedSize += pArena->size & ARENA_SIZE_MASK;
            }
            else
            {
                ARENA_INUSE *pArena = (ARENA_INUSE *)ptr;
                DPRINTF( "%08lx used %08lx\n",
		      (DWORD)pArena, pArena->size & ARENA_SIZE_MASK );
                ptr += sizeof(*pArena) + (pArena->size & ARENA_SIZE_MASK);
                arenaSize += sizeof(ARENA_INUSE);
                usedSize += pArena->size & ARENA_SIZE_MASK;
            }
        }
        DPRINTF( "\nTotal: Size=%08lx Committed=%08lx Free=%08lx Used=%08lx Arenas=%08lx (%ld%%)\n\n",
	      subheap->size, subheap->commitSize, freeSize, usedSize,
	      arenaSize, (arenaSize * 100) / subheap->size );
        subheap = subheap->next;
    }
}


/***********************************************************************
 *           HEAP_GetPtr
 * RETURNS
 *	Pointer to the heap
 *	NULL: Failure
 */
static HEAP *HEAP_GetPtr(
             HANDLE heap /* [in] Handle to the heap */
) {
    HEAP *heapPtr = (HEAP *)heap;
    if (!heapPtr || (heapPtr->magic != HEAP_MAGIC))
    {
267
        ERR("Invalid heap %p!\n", heap );
268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284
        return NULL;
    }
    if (TRACE_ON(heap) && !HEAP_IsRealArena( heapPtr, 0, NULL, NOISY ))
    {
        HEAP_Dump( heapPtr );
        assert( FALSE );
        return NULL;
    }
    return heapPtr;
}


/***********************************************************************
 *           HEAP_InsertFreeBlock
 *
 * Insert a free block into the free list.
 */
285
static inline void HEAP_InsertFreeBlock( HEAP *heap, ARENA_FREE *pArena, BOOL last )
286 287 288
{
    FREE_LIST_ENTRY *pEntry = heap->freeList;
    while (pEntry->size < pArena->size) pEntry++;
289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307
    if (last)
    {
        /* insert at end of free list, i.e. before the next free list entry */
        pEntry++;
        if (pEntry == &heap->freeList[HEAP_NB_FREE_LISTS]) pEntry = heap->freeList;
        pArena->prev       = pEntry->arena.prev;
        pArena->prev->next = pArena;
        pArena->next       = &pEntry->arena;
        pEntry->arena.prev = pArena;
    }
    else
    {
        /* insert at head of free list */
        pArena->next       = pEntry->arena.next;
        pArena->next->prev = pArena;
        pArena->prev       = &pEntry->arena;
        pEntry->arena.next = pArena;
    }
    pArena->size |= ARENA_FLAG_FREE;
308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344
}


/***********************************************************************
 *           HEAP_FindSubHeap
 * Find the sub-heap containing a given address.
 *
 * RETURNS
 *	Pointer: Success
 *	NULL: Failure
 */
static SUBHEAP *HEAP_FindSubHeap(
                HEAP *heap, /* [in] Heap pointer */
                LPCVOID ptr /* [in] Address */
) {
    SUBHEAP *sub = &heap->subheap;
    while (sub)
    {
        if (((char *)ptr >= (char *)sub) &&
            ((char *)ptr < (char *)sub + sub->size)) return sub;
        sub = sub->next;
    }
    return NULL;
}


/***********************************************************************
 *           HEAP_Commit
 *
 * Make sure the heap storage is committed up to (not including) ptr.
 */
static inline BOOL HEAP_Commit( SUBHEAP *subheap, void *ptr )
{
    DWORD size = (DWORD)((char *)ptr - (char *)subheap);
    size = (size + COMMIT_MASK) & ~COMMIT_MASK;
    if (size > subheap->size) size = subheap->size;
    if (size <= subheap->commitSize) return TRUE;
345 346 347
    size -= subheap->commitSize;
    if (NtAllocateVirtualMemory( GetCurrentProcess(), &ptr, (char *)subheap + subheap->commitSize,
                                 &size, MEM_COMMIT, PAGE_EXECUTE_READWRITE))
348 349
    {
        WARN("Could not commit %08lx bytes at %08lx for heap %08lx\n",
350
                 size, (DWORD)((char *)subheap + subheap->commitSize),
351 352 353
                 (DWORD)subheap->heap );
        return FALSE;
    }
354
    subheap->commitSize += size;
355 356 357 358 359 360 361 362 363 364 365
    return TRUE;
}


/***********************************************************************
 *           HEAP_Decommit
 *
 * If possible, decommit the heap storage from (including) 'ptr'.
 */
static inline BOOL HEAP_Decommit( SUBHEAP *subheap, void *ptr )
{
366 367 368
    void *addr;
    ULONG decommit_size;

369 370 371 372
    DWORD size = (DWORD)((char *)ptr - (char *)subheap);
    /* round to next block and add one full block */
    size = ((size + COMMIT_MASK) & ~COMMIT_MASK) + COMMIT_MASK + 1;
    if (size >= subheap->commitSize) return TRUE;
373 374 375 376
    decommit_size = subheap->commitSize - size;
    addr = (char *)subheap + size;

    if (NtFreeVirtualMemory( GetCurrentProcess(), &addr, &decommit_size, MEM_DECOMMIT ))
377
    {
378 379
        WARN("Could not decommit %08lx bytes at %08lx for heap %p\n",
                 decommit_size, (DWORD)((char *)subheap + size), subheap->heap );
380 381
        return FALSE;
    }
382
    subheap->commitSize -= decommit_size;
383 384 385 386 387 388 389 390 391 392 393 394 395
    return TRUE;
}


/***********************************************************************
 *           HEAP_CreateFreeBlock
 *
 * Create a free block at a specified address. 'size' is the size of the
 * whole block, including the new arena.
 */
static void HEAP_CreateFreeBlock( SUBHEAP *subheap, void *ptr, DWORD size )
{
    ARENA_FREE *pFree;
396
    char *pEnd;
397
    BOOL last;
398 399

    /* Create a free arena */
400
    mark_block_uninitialized( ptr, sizeof( ARENA_FREE ) );
401 402 403 404 405
    pFree = (ARENA_FREE *)ptr;
    pFree->magic = ARENA_FREE_MAGIC;

    /* If debugging, erase the freed block content */

406 407 408
    pEnd = (char *)ptr + size;
    if (pEnd > (char *)subheap + subheap->commitSize) pEnd = (char *)subheap + subheap->commitSize;
    if (pEnd > (char *)(pFree + 1)) mark_block_free( pFree + 1, pEnd - (char *)(pFree + 1) );
409 410 411 412 413 414 415 416 417 418 419

    /* Check if next block is free also */

    if (((char *)ptr + size < (char *)subheap + subheap->size) &&
        (*(DWORD *)((char *)ptr + size) & ARENA_FLAG_FREE))
    {
        /* Remove the next arena from the free list */
        ARENA_FREE *pNext = (ARENA_FREE *)((char *)ptr + size);
        pNext->next->prev = pNext->prev;
        pNext->prev->next = pNext->next;
        size += (pNext->size & ARENA_SIZE_MASK) + sizeof(*pNext);
420
        mark_block_free( pNext, sizeof(ARENA_FREE) );
421 422 423 424
    }

    /* Set the next block PREV_FREE flag and pointer */

425 426
    last = ((char *)ptr + size >= (char *)subheap + subheap->size);
    if (!last)
427 428 429
    {
        DWORD *pNext = (DWORD *)((char *)ptr + size);
        *pNext |= ARENA_FLAG_PREV_FREE;
430
        mark_block_initialized( pNext - 1, sizeof( ARENA_FREE * ) );
431 432 433 434 435 436
        *(ARENA_FREE **)(pNext - 1) = pFree;
    }

    /* Last, insert the new block into the free list */

    pFree->size = size - sizeof(*pFree);
437
    HEAP_InsertFreeBlock( subheap->heap, pFree, last );
438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475
}


/***********************************************************************
 *           HEAP_MakeInUseBlockFree
 *
 * Turn an in-use block into a free block. Can also decommit the end of
 * the heap, and possibly even free the sub-heap altogether.
 */
static void HEAP_MakeInUseBlockFree( SUBHEAP *subheap, ARENA_INUSE *pArena )
{
    ARENA_FREE *pFree;
    DWORD size = (pArena->size & ARENA_SIZE_MASK) + sizeof(*pArena);

    /* Check if we can merge with previous block */

    if (pArena->size & ARENA_FLAG_PREV_FREE)
    {
        pFree = *((ARENA_FREE **)pArena - 1);
        size += (pFree->size & ARENA_SIZE_MASK) + sizeof(ARENA_FREE);
        /* Remove it from the free list */
        pFree->next->prev = pFree->prev;
        pFree->prev->next = pFree->next;
    }
    else pFree = (ARENA_FREE *)pArena;

    /* Create a free block */

    HEAP_CreateFreeBlock( subheap, pFree, size );
    size = (pFree->size & ARENA_SIZE_MASK) + sizeof(ARENA_FREE);
    if ((char *)pFree + size < (char *)subheap + subheap->size)
        return;  /* Not the last block, so nothing more to do */

    /* Free the whole sub-heap if it's empty and not the original one */

    if (((char *)pFree == (char *)subheap + subheap->headerSize) &&
        (subheap != &subheap->heap->subheap))
    {
476
        ULONG size = 0;
477 478 479 480 481 482 483 484 485
        SUBHEAP *pPrev = &subheap->heap->subheap;
        /* Remove the free block from the list */
        pFree->next->prev = pFree->prev;
        pFree->prev->next = pFree->next;
        /* Remove the subheap from the list */
        while (pPrev && (pPrev->next != subheap)) pPrev = pPrev->next;
        if (pPrev) pPrev->next = subheap->next;
        /* Free the memory */
        subheap->magic = 0;
486
        NtFreeVirtualMemory( GetCurrentProcess(), (void **)&subheap, &size, MEM_RELEASE );
487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524
        return;
    }

    /* Decommit the end of the heap */

    if (!(subheap->heap->flags & HEAP_SHARED)) HEAP_Decommit( subheap, pFree + 1 );
}


/***********************************************************************
 *           HEAP_ShrinkBlock
 *
 * Shrink an in-use block.
 */
static void HEAP_ShrinkBlock(SUBHEAP *subheap, ARENA_INUSE *pArena, DWORD size)
{
    if ((pArena->size & ARENA_SIZE_MASK) >= size + HEAP_MIN_BLOCK_SIZE)
    {
        HEAP_CreateFreeBlock( subheap, (char *)(pArena + 1) + size,
                              (pArena->size & ARENA_SIZE_MASK) - size );
	/* assign size plus previous arena flags */
        pArena->size = size | (pArena->size & ~ARENA_SIZE_MASK);
    }
    else
    {
        /* Turn off PREV_FREE flag in next block */
        char *pNext = (char *)(pArena + 1) + (pArena->size & ARENA_SIZE_MASK);
        if (pNext < (char *)subheap + subheap->size)
            *(DWORD *)pNext &= ~ARENA_FLAG_PREV_FREE;
    }
}

/***********************************************************************
 *           HEAP_InitSubHeap
 */
static BOOL HEAP_InitSubHeap( HEAP *heap, LPVOID address, DWORD flags,
                                DWORD commitSize, DWORD totalSize )
{
525
    SUBHEAP *subheap;
526 527 528 529 530 531 532
    FREE_LIST_ENTRY *pEntry;
    int i;

    /* Commit memory */

    if (flags & HEAP_SHARED)
        commitSize = totalSize;  /* always commit everything in a shared heap */
533 534
    if (NtAllocateVirtualMemory( GetCurrentProcess(), &address, address,
                                 &commitSize, MEM_COMMIT, PAGE_EXECUTE_READWRITE))
535
    {
536
        WARN("Could not commit %08lx bytes for sub-heap %p\n", commitSize, address );
537 538 539 540 541
        return FALSE;
    }

    /* Fill the sub-heap structure */

542
    subheap = (SUBHEAP *)address;
543 544 545 546 547 548 549 550 551
    subheap->heap       = heap;
    subheap->size       = totalSize;
    subheap->commitSize = commitSize;
    subheap->magic      = SUBHEAP_MAGIC;

    if ( subheap != (SUBHEAP *)heap )
    {
        /* If this is a secondary subheap, insert it into list */

552
        subheap->headerSize = ROUND_SIZE( sizeof(SUBHEAP) );
553 554 555 556 557 558 559
        subheap->next       = heap->subheap.next;
        heap->subheap.next  = subheap;
    }
    else
    {
        /* If this is a primary subheap, initialize main heap */

560
        subheap->headerSize = ROUND_SIZE( sizeof(HEAP) );
561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581
        subheap->next       = NULL;
        heap->next          = NULL;
        heap->flags         = flags;
        heap->magic         = HEAP_MAGIC;

        /* Build the free lists */

        for (i = 0, pEntry = heap->freeList; i < HEAP_NB_FREE_LISTS; i++, pEntry++)
        {
            pEntry->size       = HEAP_freeListSizes[i];
            pEntry->arena.size = 0 | ARENA_FLAG_FREE;
            pEntry->arena.next = i < HEAP_NB_FREE_LISTS-1 ?
                                 &heap->freeList[i+1].arena : &heap->freeList[0].arena;
            pEntry->arena.prev = i ? &heap->freeList[i-1].arena :
                                  &heap->freeList[HEAP_NB_FREE_LISTS-1].arena;
            pEntry->arena.magic = ARENA_FREE_MAGIC;
        }

        /* Initialize critical section */

        RtlInitializeCriticalSection( &heap->critSection );
582
        if (flags & HEAP_SHARED)
583 584 585 586 587 588 589 590 591
        {
            /* let's assume that only one thread at a time will try to do this */
            HANDLE sem = heap->critSection.LockSemaphore;
            if (!sem) NtCreateSemaphore( &sem, SEMAPHORE_ALL_ACCESS, NULL, 0, 1 );

            NtDuplicateObject( GetCurrentProcess(), sem, GetCurrentProcess(), &sem, 0, 0,
                               DUP_HANDLE_MAKE_GLOBAL | DUP_HANDLE_SAME_ACCESS | DUP_HANDLE_CLOSE_SOURCE );
            heap->critSection.LockSemaphore = sem;
        }
592 593 594 595
    }

    /* Create the first free block */

596
    HEAP_CreateFreeBlock( subheap, (LPBYTE)subheap + subheap->headerSize,
597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612
                          subheap->size - subheap->headerSize );

    return TRUE;
}

/***********************************************************************
 *           HEAP_CreateSubHeap
 *
 * Create a sub-heap of the given size.
 * If heap == NULL, creates a main heap.
 */
static SUBHEAP *HEAP_CreateSubHeap( HEAP *heap, void *base, DWORD flags,
                                    DWORD commitSize, DWORD totalSize )
{
    LPVOID address = base;

613 614 615 616 617 618
    /* round-up sizes on a 64K boundary */
    totalSize  = (totalSize + 0xffff) & 0xffff0000;
    commitSize = (commitSize + 0xffff) & 0xffff0000;
    if (!commitSize) commitSize = 0x10000;
    if (totalSize < commitSize) totalSize = commitSize;

619 620 621
    if (!address)
    {
        /* allocate the memory block */
622 623
        if (NtAllocateVirtualMemory( GetCurrentProcess(), &address, NULL, &totalSize,
                                     MEM_RESERVE, PAGE_EXECUTE_READWRITE ))
624
        {
625
            WARN("Could not allocate %08lx bytes\n", totalSize );
626 627 628 629 630 631 632 633 634
            return NULL;
        }
    }

    /* Initialize subheap */

    if (!HEAP_InitSubHeap( heap ? heap : (HEAP *)address,
                           address, flags, commitSize, totalSize ))
    {
635 636
        ULONG size = 0;
        if (!base) NtFreeVirtualMemory( GetCurrentProcess(), &address, &size, MEM_RELEASE );
637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689
        return NULL;
    }

    return (SUBHEAP *)address;
}


/***********************************************************************
 *           HEAP_FindFreeBlock
 *
 * Find a free block at least as large as the requested size, and make sure
 * the requested size is committed.
 */
static ARENA_FREE *HEAP_FindFreeBlock( HEAP *heap, DWORD size,
                                       SUBHEAP **ppSubHeap )
{
    SUBHEAP *subheap;
    ARENA_FREE *pArena;
    FREE_LIST_ENTRY *pEntry = heap->freeList;

    /* Find a suitable free list, and in it find a block large enough */

    while (pEntry->size < size) pEntry++;
    pArena = pEntry->arena.next;
    while (pArena != &heap->freeList[0].arena)
    {
        DWORD arena_size = (pArena->size & ARENA_SIZE_MASK) +
                            sizeof(ARENA_FREE) - sizeof(ARENA_INUSE);
        if (arena_size >= size)
        {
            subheap = HEAP_FindSubHeap( heap, pArena );
            if (!HEAP_Commit( subheap, (char *)pArena + sizeof(ARENA_INUSE)
                                               + size + HEAP_MIN_BLOCK_SIZE))
                return NULL;
            *ppSubHeap = subheap;
            return pArena;
        }
        pArena = pArena->next;
    }

    /* If no block was found, attempt to grow the heap */

    if (!(heap->flags & HEAP_GROWABLE))
    {
        WARN("Not enough space in heap %08lx for %08lx bytes\n",
                 (DWORD)heap, size );
        return NULL;
    }
    /* make sure that we have a big enough size *committed* to fit another
     * last free arena in !
     * So just one heap struct, one first free arena which will eventually
     * get inuse, and HEAP_MIN_BLOCK_SIZE for the second free arena that
     * might get assigned all remaining free space in HEAP_ShrinkBlock() */
690
    size += ROUND_SIZE(sizeof(SUBHEAP)) + sizeof(ARENA_INUSE) + HEAP_MIN_BLOCK_SIZE;
691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728
    if (!(subheap = HEAP_CreateSubHeap( heap, NULL, heap->flags, size,
                                        max( HEAP_DEF_SIZE, size ) )))
        return NULL;

    TRACE("created new sub-heap %08lx of %08lx bytes for heap %08lx\n",
                (DWORD)subheap, size, (DWORD)heap );

    *ppSubHeap = subheap;
    return (ARENA_FREE *)(subheap + 1);
}


/***********************************************************************
 *           HEAP_IsValidArenaPtr
 *
 * Check that the pointer is inside the range possible for arenas.
 */
static BOOL HEAP_IsValidArenaPtr( HEAP *heap, void *ptr )
{
    int i;
    SUBHEAP *subheap = HEAP_FindSubHeap( heap, ptr );
    if (!subheap) return FALSE;
    if ((char *)ptr >= (char *)subheap + subheap->headerSize) return TRUE;
    if (subheap != &heap->subheap) return FALSE;
    for (i = 0; i < HEAP_NB_FREE_LISTS; i++)
        if (ptr == (void *)&heap->freeList[i].arena) return TRUE;
    return FALSE;
}


/***********************************************************************
 *           HEAP_ValidateFreeArena
 */
static BOOL HEAP_ValidateFreeArena( SUBHEAP *subheap, ARENA_FREE *pArena )
{
    char *heapEnd = (char *)subheap + subheap->size;

    /* Check for unaligned pointers */
729
    if ( (long)pArena % ALIGNMENT != 0 )
730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766
    {
        ERR( "Heap %08lx: unaligned arena pointer %08lx\n",
             (DWORD)subheap->heap, (DWORD)pArena );
        return FALSE;
    }

    /* Check magic number */
    if (pArena->magic != ARENA_FREE_MAGIC)
    {
        ERR("Heap %08lx: invalid free arena magic for %08lx\n",
                 (DWORD)subheap->heap, (DWORD)pArena );
        return FALSE;
    }
    /* Check size flags */
    if (!(pArena->size & ARENA_FLAG_FREE) ||
        (pArena->size & ARENA_FLAG_PREV_FREE))
    {
        ERR("Heap %08lx: bad flags %lx for free arena %08lx\n",
                 (DWORD)subheap->heap, pArena->size & ~ARENA_SIZE_MASK, (DWORD)pArena );
    }
    /* Check arena size */
    if ((char *)(pArena + 1) + (pArena->size & ARENA_SIZE_MASK) > heapEnd)
    {
        ERR("Heap %08lx: bad size %08lx for free arena %08lx\n",
                 (DWORD)subheap->heap, (DWORD)pArena->size & ARENA_SIZE_MASK, (DWORD)pArena );
        return FALSE;
    }
    /* Check that next pointer is valid */
    if (!HEAP_IsValidArenaPtr( subheap->heap, pArena->next ))
    {
        ERR("Heap %08lx: bad next ptr %08lx for arena %08lx\n",
                 (DWORD)subheap->heap, (DWORD)pArena->next, (DWORD)pArena );
        return FALSE;
    }
    /* Check that next arena is free */
    if (!(pArena->next->size & ARENA_FLAG_FREE) ||
        (pArena->next->magic != ARENA_FREE_MAGIC))
767 768
    {
        ERR("Heap %08lx: next arena %08lx invalid for %08lx\n",
769 770 771 772 773 774 775 776 777 778 779 780 781
                 (DWORD)subheap->heap, (DWORD)pArena->next, (DWORD)pArena );
        return FALSE;
    }
    /* Check that prev pointer is valid */
    if (!HEAP_IsValidArenaPtr( subheap->heap, pArena->prev ))
    {
        ERR("Heap %08lx: bad prev ptr %08lx for arena %08lx\n",
                 (DWORD)subheap->heap, (DWORD)pArena->prev, (DWORD)pArena );
        return FALSE;
    }
    /* Check that prev arena is free */
    if (!(pArena->prev->size & ARENA_FLAG_FREE) ||
        (pArena->prev->magic != ARENA_FREE_MAGIC))
782
    {
783 784
	/* this often means that the prev arena got overwritten
	 * by a memory write before that prev arena */
785
        ERR("Heap %08lx: prev arena %08lx invalid for %08lx\n",
786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820
                 (DWORD)subheap->heap, (DWORD)pArena->prev, (DWORD)pArena );
        return FALSE;
    }
    /* Check that next block has PREV_FREE flag */
    if ((char *)(pArena + 1) + (pArena->size & ARENA_SIZE_MASK) < heapEnd)
    {
        if (!(*(DWORD *)((char *)(pArena + 1) +
            (pArena->size & ARENA_SIZE_MASK)) & ARENA_FLAG_PREV_FREE))
        {
            ERR("Heap %08lx: free arena %08lx next block has no PREV_FREE flag\n",
                     (DWORD)subheap->heap, (DWORD)pArena );
            return FALSE;
        }
        /* Check next block back pointer */
        if (*((ARENA_FREE **)((char *)(pArena + 1) +
            (pArena->size & ARENA_SIZE_MASK)) - 1) != pArena)
        {
            ERR("Heap %08lx: arena %08lx has wrong back ptr %08lx\n",
                     (DWORD)subheap->heap, (DWORD)pArena,
                     *((DWORD *)((char *)(pArena+1)+ (pArena->size & ARENA_SIZE_MASK)) - 1));
            return FALSE;
        }
    }
    return TRUE;
}


/***********************************************************************
 *           HEAP_ValidateInUseArena
 */
static BOOL HEAP_ValidateInUseArena( SUBHEAP *subheap, ARENA_INUSE *pArena, BOOL quiet )
{
    char *heapEnd = (char *)subheap + subheap->size;

    /* Check for unaligned pointers */
821
    if ( (long)pArena % ALIGNMENT != 0 )
822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856
    {
        if ( quiet == NOISY )
        {
            ERR( "Heap %08lx: unaligned arena pointer %08lx\n",
                  (DWORD)subheap->heap, (DWORD)pArena );
            if ( TRACE_ON(heap) )
                HEAP_Dump( subheap->heap );
        }
        else if ( WARN_ON(heap) )
        {
            WARN( "Heap %08lx: unaligned arena pointer %08lx\n",
                  (DWORD)subheap->heap, (DWORD)pArena );
            if ( TRACE_ON(heap) )
                HEAP_Dump( subheap->heap );
        }
        return FALSE;
    }

    /* Check magic number */
    if (pArena->magic != ARENA_INUSE_MAGIC)
    {
        if (quiet == NOISY) {
        ERR("Heap %08lx: invalid in-use arena magic for %08lx\n",
                 (DWORD)subheap->heap, (DWORD)pArena );
            if (TRACE_ON(heap))
               HEAP_Dump( subheap->heap );
        }  else if (WARN_ON(heap)) {
            WARN("Heap %08lx: invalid in-use arena magic for %08lx\n",
                 (DWORD)subheap->heap, (DWORD)pArena );
            if (TRACE_ON(heap))
               HEAP_Dump( subheap->heap );
        }
        return FALSE;
    }
    /* Check size flags */
857
    if (pArena->size & ARENA_FLAG_FREE)
858 859 860
    {
        ERR("Heap %08lx: bad flags %lx for in-use arena %08lx\n",
                 (DWORD)subheap->heap, pArena->size & ~ARENA_SIZE_MASK, (DWORD)pArena );
861
        return FALSE;
862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891
    }
    /* Check arena size */
    if ((char *)(pArena + 1) + (pArena->size & ARENA_SIZE_MASK) > heapEnd)
    {
        ERR("Heap %08lx: bad size %08lx for in-use arena %08lx\n",
                 (DWORD)subheap->heap, (DWORD)pArena->size & ARENA_SIZE_MASK, (DWORD)pArena );
        return FALSE;
    }
    /* Check next arena PREV_FREE flag */
    if (((char *)(pArena + 1) + (pArena->size & ARENA_SIZE_MASK) < heapEnd) &&
        (*(DWORD *)((char *)(pArena + 1) + (pArena->size & ARENA_SIZE_MASK)) & ARENA_FLAG_PREV_FREE))
    {
        ERR("Heap %08lx: in-use arena %08lx next block has PREV_FREE flag\n",
                 (DWORD)subheap->heap, (DWORD)pArena );
        return FALSE;
    }
    /* Check prev free arena */
    if (pArena->size & ARENA_FLAG_PREV_FREE)
    {
        ARENA_FREE *pPrev = *((ARENA_FREE **)pArena - 1);
        /* Check prev pointer */
        if (!HEAP_IsValidArenaPtr( subheap->heap, pPrev ))
        {
            ERR("Heap %08lx: bad back ptr %08lx for arena %08lx\n",
                    (DWORD)subheap->heap, (DWORD)pPrev, (DWORD)pArena );
            return FALSE;
        }
        /* Check that prev arena is free */
        if (!(pPrev->size & ARENA_FLAG_FREE) ||
            (pPrev->magic != ARENA_FREE_MAGIC))
892 893
        {
            ERR("Heap %08lx: prev arena %08lx invalid for in-use %08lx\n",
894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945
                     (DWORD)subheap->heap, (DWORD)pPrev, (DWORD)pArena );
            return FALSE;
        }
        /* Check that prev arena is really the previous block */
        if ((char *)(pPrev + 1) + (pPrev->size & ARENA_SIZE_MASK) != (char *)pArena)
        {
            ERR("Heap %08lx: prev arena %08lx is not prev for in-use %08lx\n",
                     (DWORD)subheap->heap, (DWORD)pPrev, (DWORD)pArena );
            return FALSE;
        }
    }
    return TRUE;
}


/***********************************************************************
 *           HEAP_IsRealArena  [Internal]
 * Validates a block is a valid arena.
 *
 * RETURNS
 *	TRUE: Success
 *	FALSE: Failure
 */
static BOOL HEAP_IsRealArena( HEAP *heapPtr,   /* [in] ptr to the heap */
              DWORD flags,   /* [in] Bit flags that control access during operation */
              LPCVOID block, /* [in] Optional pointer to memory block to validate */
              BOOL quiet )   /* [in] Flag - if true, HEAP_ValidateInUseArena
                              *             does not complain    */
{
    SUBHEAP *subheap;
    BOOL ret = TRUE;

    if (!heapPtr || (heapPtr->magic != HEAP_MAGIC))
    {
        ERR("Invalid heap %p!\n", heapPtr );
        return FALSE;
    }

    flags &= HEAP_NO_SERIALIZE;
    flags |= heapPtr->flags;
    /* calling HeapLock may result in infinite recursion, so do the critsect directly */
    if (!(flags & HEAP_NO_SERIALIZE))
        RtlEnterCriticalSection( &heapPtr->critSection );

    if (block)
    {
        /* Only check this single memory block */

        if (!(subheap = HEAP_FindSubHeap( heapPtr, block )) ||
            ((char *)block < (char *)subheap + subheap->headerSize
                              + sizeof(ARENA_INUSE)))
        {
946
            if (quiet == NOISY)
947
                ERR("Heap %p: block %p is not inside heap\n", heapPtr, block );
948
            else if (WARN_ON(heap))
949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991
                WARN("Heap %p: block %p is not inside heap\n", heapPtr, block );
            ret = FALSE;
        } else
            ret = HEAP_ValidateInUseArena( subheap, (ARENA_INUSE *)block - 1, quiet );

        if (!(flags & HEAP_NO_SERIALIZE))
            RtlLeaveCriticalSection( &heapPtr->critSection );
        return ret;
    }

    subheap = &heapPtr->subheap;
    while (subheap && ret)
    {
        char *ptr = (char *)subheap + subheap->headerSize;
        while (ptr < (char *)subheap + subheap->size)
        {
            if (*(DWORD *)ptr & ARENA_FLAG_FREE)
            {
                if (!HEAP_ValidateFreeArena( subheap, (ARENA_FREE *)ptr )) {
                    ret = FALSE;
                    break;
                }
                ptr += sizeof(ARENA_FREE) + (*(DWORD *)ptr & ARENA_SIZE_MASK);
            }
            else
            {
                if (!HEAP_ValidateInUseArena( subheap, (ARENA_INUSE *)ptr, NOISY )) {
                    ret = FALSE;
                    break;
                }
                ptr += sizeof(ARENA_INUSE) + (*(DWORD *)ptr & ARENA_SIZE_MASK);
            }
        }
        subheap = subheap->next;
    }

    if (!(flags & HEAP_NO_SERIALIZE)) RtlLeaveCriticalSection( &heapPtr->critSection );
    return ret;
}


/***********************************************************************
 *           RtlCreateHeap   (NTDLL.@)
Jon Griffiths's avatar
Jon Griffiths committed
992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005
 *
 * Create a new Heap.
 *
 * PARAMS
 *  flags      [I] HEAP_ flags from "winnt.h"
 *  addr       [I] Desired base address
 *  totalSize  [I] Total size of the heap, or 0 for a growable heap
 *  commitSize [I] Amount of heap space to commit
 *  unknown    [I] Not yet understood
 *  definition [I] Heap definition
 *
 * RETURNS
 *  Success: A HANDLE to the newly created heap.
 *  Failure: a NULL HANDLE.
1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030
 */
HANDLE WINAPI RtlCreateHeap( ULONG flags, PVOID addr, ULONG totalSize, ULONG commitSize,
                             PVOID unknown, PRTL_HEAP_DEFINITION definition )
{
    SUBHEAP *subheap;

    /* Allocate the heap block */

    if (!totalSize)
    {
        totalSize = HEAP_DEF_SIZE;
        flags |= HEAP_GROWABLE;
    }

    if (!(subheap = HEAP_CreateSubHeap( NULL, addr, flags, commitSize, totalSize ))) return 0;

    /* link it into the per-process heap list */
    if (processHeap)
    {
        HEAP *heapPtr = subheap->heap;
        RtlLockHeap( processHeap );
        heapPtr->next = firstHeap;
        firstHeap = heapPtr;
        RtlUnlockHeap( processHeap );
    }
1031 1032
    else processHeap = subheap->heap;  /* assume the first heap we create is the process main heap */

1033 1034 1035 1036 1037 1038
    return (HANDLE)subheap;
}


/***********************************************************************
 *           RtlDestroyHeap   (NTDLL.@)
Jon Griffiths's avatar
Jon Griffiths committed
1039 1040 1041 1042 1043 1044 1045 1046 1047
 *
 * Destroy a Heap created with RtlCreateHeap().
 *
 * PARAMS
 *  heap [I] Heap to destroy.
 *
 * RETURNS
 *  Success: A NULL HANDLE, if heap is NULL or it was destroyed
 *  Failure: The Heap handle, if heap is the process heap.
1048 1049 1050 1051 1052 1053
 */
HANDLE WINAPI RtlDestroyHeap( HANDLE heap )
{
    HEAP *heapPtr = HEAP_GetPtr( heap );
    SUBHEAP *subheap;

1054
    TRACE("%p\n", heap );
1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072
    if (!heapPtr) return heap;

    if (heap == processHeap) return heap; /* cannot delete the main process heap */
    else /* remove it from the per-process list */
    {
        HEAP **pptr;
        RtlLockHeap( processHeap );
        pptr = &firstHeap;
        while (*pptr && *pptr != heapPtr) pptr = &(*pptr)->next;
        if (*pptr) *pptr = (*pptr)->next;
        RtlUnlockHeap( processHeap );
    }

    RtlDeleteCriticalSection( &heapPtr->critSection );
    subheap = &heapPtr->subheap;
    while (subheap)
    {
        SUBHEAP *next = subheap->next;
1073 1074 1075
        ULONG size = 0;
        void *addr = subheap;
        NtFreeVirtualMemory( GetCurrentProcess(), &addr, &size, MEM_RELEASE );
1076 1077 1078 1079 1080 1081 1082 1083 1084
        subheap = next;
    }
    return 0;
}


/***********************************************************************
 *           RtlAllocateHeap   (NTDLL.@)
 *
Jon Griffiths's avatar
Jon Griffiths committed
1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097
 * Allocate a memory block from a Heap.
 *
 * PARAMS
 *  heap  [I] Heap to allocate block from
 *  flags [I] HEAP_ flags from "winnt.h"
 *  size  [I] Size of the memory block to allocate
 *
 * RETURNS
 *  Success: A pointer to the newly allocated block
 *  Failure: NULL.
 *
 * NOTES
 *  This call does not SetLastError().
1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110
 */
PVOID WINAPI RtlAllocateHeap( HANDLE heap, ULONG flags, ULONG size )
{
    ARENA_FREE *pArena;
    ARENA_INUSE *pInUse;
    SUBHEAP *subheap;
    HEAP *heapPtr = HEAP_GetPtr( heap );

    /* Validate the parameters */

    if (!heapPtr) return NULL;
    flags &= HEAP_GENERATE_EXCEPTIONS | HEAP_NO_SERIALIZE | HEAP_ZERO_MEMORY;
    flags |= heapPtr->flags;
1111
    size = ROUND_SIZE(size);
1112 1113 1114 1115 1116 1117 1118
    if (size < HEAP_MIN_BLOCK_SIZE) size = HEAP_MIN_BLOCK_SIZE;

    if (!(flags & HEAP_NO_SERIALIZE)) RtlEnterCriticalSection( &heapPtr->critSection );
    /* Locate a suitable free block */

    if (!(pArena = HEAP_FindFreeBlock( heapPtr, size, &subheap )))
    {
1119
        TRACE("(%p,%08lx,%08lx): returning NULL\n",
1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144
                  heap, flags, size  );
        if (!(flags & HEAP_NO_SERIALIZE)) RtlLeaveCriticalSection( &heapPtr->critSection );
        if (flags & HEAP_GENERATE_EXCEPTIONS) RtlRaiseStatus( STATUS_NO_MEMORY );
        return NULL;
    }

    /* Remove the arena from the free list */

    pArena->next->prev = pArena->prev;
    pArena->prev->next = pArena->next;

    /* Build the in-use arena */

    pInUse = (ARENA_INUSE *)pArena;

    /* in-use arena is smaller than free arena,
     * so we have to add the difference to the size */
    pInUse->size  = (pInUse->size & ~ARENA_FLAG_FREE) + sizeof(ARENA_FREE) - sizeof(ARENA_INUSE);
    pInUse->magic = ARENA_INUSE_MAGIC;

    /* Shrink the block */

    HEAP_ShrinkBlock( subheap, pInUse, size );

    if (flags & HEAP_ZERO_MEMORY)
1145 1146 1147
        clear_block( pInUse + 1, pInUse->size & ARENA_SIZE_MASK );
    else
        mark_block_uninitialized( pInUse + 1, pInUse->size & ARENA_SIZE_MASK );
1148 1149 1150

    if (!(flags & HEAP_NO_SERIALIZE)) RtlLeaveCriticalSection( &heapPtr->critSection );

1151
    TRACE("(%p,%08lx,%08lx): returning %08lx\n",
1152 1153 1154 1155 1156 1157 1158
                  heap, flags, size, (DWORD)(pInUse + 1) );
    return (LPVOID)(pInUse + 1);
}


/***********************************************************************
 *           RtlFreeHeap   (NTDLL.@)
Jon Griffiths's avatar
Jon Griffiths committed
1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169
 *
 * Free a memory block allocated with RtlAllocateHeap().
 *
 * PARAMS
 *  heap  [I] Heap that block was allocated from
 *  flags [I] HEAP_ flags from "winnt.h"
 *  ptr   [I] Block to free
 *
 * RETURNS
 *  Success: TRUE, if ptr is NULL or was freed successfully.
 *  Failure: FALSE.
1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192
 */
BOOLEAN WINAPI RtlFreeHeap( HANDLE heap, ULONG flags, PVOID ptr )
{
    ARENA_INUSE *pInUse;
    SUBHEAP *subheap;
    HEAP *heapPtr = HEAP_GetPtr( heap );

    /* Validate the parameters */

    if (!ptr) return TRUE;  /* freeing a NULL ptr isn't an error in Win2k */
    if (!heapPtr)
    {
        set_status( STATUS_INVALID_HANDLE );
        return FALSE;
    }

    flags &= HEAP_NO_SERIALIZE;
    flags |= heapPtr->flags;
    if (!(flags & HEAP_NO_SERIALIZE)) RtlEnterCriticalSection( &heapPtr->critSection );
    if (!HEAP_IsRealArena( heapPtr, HEAP_NO_SERIALIZE, ptr, QUIET ))
    {
        if (!(flags & HEAP_NO_SERIALIZE)) RtlLeaveCriticalSection( &heapPtr->critSection );
        set_status( STATUS_INVALID_PARAMETER );
1193
        TRACE("(%p,%08lx,%08lx): returning FALSE\n",
1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205
                      heap, flags, (DWORD)ptr );
        return FALSE;
    }

    /* Turn the block into a free block */

    pInUse  = (ARENA_INUSE *)ptr - 1;
    subheap = HEAP_FindSubHeap( heapPtr, pInUse );
    HEAP_MakeInUseBlockFree( subheap, pInUse );

    if (!(flags & HEAP_NO_SERIALIZE)) RtlLeaveCriticalSection( &heapPtr->critSection );

1206
    TRACE("(%p,%08lx,%08lx): returning TRUE\n",
1207 1208 1209 1210 1211 1212 1213
                  heap, flags, (DWORD)ptr );
    return TRUE;
}


/***********************************************************************
 *           RtlReAllocateHeap   (NTDLL.@)
Jon Griffiths's avatar
Jon Griffiths committed
1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225
 *
 * Change the size of a memory block allocated with RtlAllocateHeap().
 *
 * PARAMS
 *  heap  [I] Heap that block was allocated from
 *  flags [I] HEAP_ flags from "winnt.h"
 *  ptr   [I] Block to resize
 *  size  [I] Size of the memory block to allocate
 *
 * RETURNS
 *  Success: A pointer to the resized block (which may be different).
 *  Failure: NULL.
1226 1227 1228 1229 1230 1231 1232 1233
 */
PVOID WINAPI RtlReAllocateHeap( HANDLE heap, ULONG flags, PVOID ptr, ULONG size )
{
    ARENA_INUSE *pArena;
    DWORD oldSize;
    HEAP *heapPtr;
    SUBHEAP *subheap;

1234
    if (!ptr) return NULL;
1235 1236 1237
    if (!(heapPtr = HEAP_GetPtr( heap )))
    {
        set_status( STATUS_INVALID_HANDLE );
1238
        return NULL;
1239 1240 1241 1242 1243 1244 1245
    }

    /* Validate the parameters */

    flags &= HEAP_GENERATE_EXCEPTIONS | HEAP_NO_SERIALIZE | HEAP_ZERO_MEMORY |
             HEAP_REALLOC_IN_PLACE_ONLY;
    flags |= heapPtr->flags;
1246
    size = ROUND_SIZE(size);
1247 1248 1249 1250 1251 1252 1253
    if (size < HEAP_MIN_BLOCK_SIZE) size = HEAP_MIN_BLOCK_SIZE;

    if (!(flags & HEAP_NO_SERIALIZE)) RtlEnterCriticalSection( &heapPtr->critSection );
    if (!HEAP_IsRealArena( heapPtr, HEAP_NO_SERIALIZE, ptr, QUIET ))
    {
        if (!(flags & HEAP_NO_SERIALIZE)) RtlLeaveCriticalSection( &heapPtr->critSection );
        set_status( STATUS_INVALID_PARAMETER );
1254
        TRACE("(%p,%08lx,%08lx,%08lx): returning NULL\n",
1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309
                      heap, flags, (DWORD)ptr, size );
        return NULL;
    }

    /* Check if we need to grow the block */

    pArena = (ARENA_INUSE *)ptr - 1;
    subheap = HEAP_FindSubHeap( heapPtr, pArena );
    oldSize = (pArena->size & ARENA_SIZE_MASK);
    if (size > oldSize)
    {
        char *pNext = (char *)(pArena + 1) + oldSize;
        if ((pNext < (char *)subheap + subheap->size) &&
            (*(DWORD *)pNext & ARENA_FLAG_FREE) &&
            (oldSize + (*(DWORD *)pNext & ARENA_SIZE_MASK) + sizeof(ARENA_FREE) >= size))
        {
            /* The next block is free and large enough */
            ARENA_FREE *pFree = (ARENA_FREE *)pNext;
            pFree->next->prev = pFree->prev;
            pFree->prev->next = pFree->next;
            pArena->size += (pFree->size & ARENA_SIZE_MASK) + sizeof(*pFree);
            if (!HEAP_Commit( subheap, (char *)pArena + sizeof(ARENA_INUSE)
                                               + size + HEAP_MIN_BLOCK_SIZE))
            {
                if (!(flags & HEAP_NO_SERIALIZE)) RtlLeaveCriticalSection( &heapPtr->critSection );
                if (flags & HEAP_GENERATE_EXCEPTIONS) RtlRaiseStatus( STATUS_NO_MEMORY );
                set_status( STATUS_NO_MEMORY );
                return NULL;
            }
            HEAP_ShrinkBlock( subheap, pArena, size );
        }
        else  /* Do it the hard way */
        {
            ARENA_FREE *pNew;
            ARENA_INUSE *pInUse;
            SUBHEAP *newsubheap;

            if ((flags & HEAP_REALLOC_IN_PLACE_ONLY) ||
                !(pNew = HEAP_FindFreeBlock( heapPtr, size, &newsubheap )))
            {
                if (!(flags & HEAP_NO_SERIALIZE)) RtlLeaveCriticalSection( &heapPtr->critSection );
                if (flags & HEAP_GENERATE_EXCEPTIONS) RtlRaiseStatus( STATUS_NO_MEMORY );
                set_status( STATUS_NO_MEMORY );
                return NULL;
            }

            /* Build the in-use arena */

            pNew->next->prev = pNew->prev;
            pNew->prev->next = pNew->next;
            pInUse = (ARENA_INUSE *)pNew;
            pInUse->size = (pInUse->size & ~ARENA_FLAG_FREE)
                           + sizeof(ARENA_FREE) - sizeof(ARENA_INUSE);
            pInUse->magic = ARENA_INUSE_MAGIC;
            HEAP_ShrinkBlock( newsubheap, pInUse, size );
1310
            mark_block_initialized( pInUse + 1, oldSize );
1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326
            memcpy( pInUse + 1, pArena + 1, oldSize );

            /* Free the previous block */

            HEAP_MakeInUseBlockFree( subheap, pArena );
            subheap = newsubheap;
            pArena  = pInUse;
        }
    }
    else HEAP_ShrinkBlock( subheap, pArena, size );  /* Shrink the block */

    /* Clear the extra bytes if needed */

    if (size > oldSize)
    {
        if (flags & HEAP_ZERO_MEMORY)
1327 1328 1329 1330 1331
            clear_block( (char *)(pArena + 1) + oldSize,
                         (pArena->size & ARENA_SIZE_MASK) - oldSize );
        else
            mark_block_uninitialized( (char *)(pArena + 1) + oldSize,
                                      (pArena->size & ARENA_SIZE_MASK) - oldSize );
1332 1333 1334 1335 1336 1337
    }

    /* Return the new arena */

    if (!(flags & HEAP_NO_SERIALIZE)) RtlLeaveCriticalSection( &heapPtr->critSection );

1338
    TRACE("(%p,%08lx,%08lx,%08lx): returning %08lx\n",
1339 1340 1341 1342 1343 1344 1345
                  heap, flags, (DWORD)ptr, size, (DWORD)(pArena + 1) );
    return (LPVOID)(pArena + 1);
}


/***********************************************************************
 *           RtlCompactHeap   (NTDLL.@)
Jon Griffiths's avatar
Jon Griffiths committed
1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357
 *
 * Compact the free space in a Heap.
 *
 * PARAMS
 *  heap  [I] Heap that block was allocated from
 *  flags [I] HEAP_ flags from "winnt.h"
 *
 * RETURNS
 *  The number of bytes compacted.
 *
 * NOTES
 *  This function is a harmless stub.
1358 1359 1360 1361 1362 1363 1364 1365 1366 1367
 */
ULONG WINAPI RtlCompactHeap( HANDLE heap, ULONG flags )
{
    FIXME( "stub\n" );
    return 0;
}


/***********************************************************************
 *           RtlLockHeap   (NTDLL.@)
Jon Griffiths's avatar
Jon Griffiths committed
1368 1369 1370 1371 1372 1373 1374 1375 1376
 *
 * Lock a Heap.
 *
 * PARAMS
 *  heap  [I] Heap to lock
 *
 * RETURNS
 *  Success: TRUE. The Heap is locked.
 *  Failure: FALSE, if heap is invalid.
1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388
 */
BOOLEAN WINAPI RtlLockHeap( HANDLE heap )
{
    HEAP *heapPtr = HEAP_GetPtr( heap );
    if (!heapPtr) return FALSE;
    RtlEnterCriticalSection( &heapPtr->critSection );
    return TRUE;
}


/***********************************************************************
 *           RtlUnlockHeap   (NTDLL.@)
Jon Griffiths's avatar
Jon Griffiths committed
1389 1390 1391 1392 1393 1394 1395 1396 1397
 *
 * Unlock a Heap.
 *
 * PARAMS
 *  heap  [I] Heap to unlock
 *
 * RETURNS
 *  Success: TRUE. The Heap is unlocked.
 *  Failure: FALSE, if heap is invalid.
1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409
 */
BOOLEAN WINAPI RtlUnlockHeap( HANDLE heap )
{
    HEAP *heapPtr = HEAP_GetPtr( heap );
    if (!heapPtr) return FALSE;
    RtlLeaveCriticalSection( &heapPtr->critSection );
    return TRUE;
}


/***********************************************************************
 *           RtlSizeHeap   (NTDLL.@)
Jon Griffiths's avatar
Jon Griffiths committed
1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423
 *
 * Get the actual size of a memory block allocated from a Heap.
 *
 * PARAMS
 *  heap  [I] Heap that block was allocated from
 *  flags [I] HEAP_ flags from "winnt.h"
 *  ptr   [I] Block to get the size of
 *
 * RETURNS
 *  Success: The size of the block.
 *  Failure: -1, heap or ptr are invalid.
 *
 * NOTES
 *  The size may be bigger than what was passed to RtlAllocateHeap().
1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449
 */
ULONG WINAPI RtlSizeHeap( HANDLE heap, ULONG flags, PVOID ptr )
{
    DWORD ret;
    HEAP *heapPtr = HEAP_GetPtr( heap );

    if (!heapPtr)
    {
        set_status( STATUS_INVALID_HANDLE );
        return (ULONG)-1;
    }
    flags &= HEAP_NO_SERIALIZE;
    flags |= heapPtr->flags;
    if (!(flags & HEAP_NO_SERIALIZE)) RtlEnterCriticalSection( &heapPtr->critSection );
    if (!HEAP_IsRealArena( heapPtr, HEAP_NO_SERIALIZE, ptr, QUIET ))
    {
        set_status( STATUS_INVALID_PARAMETER );
        ret = (ULONG)-1;
    }
    else
    {
        ARENA_INUSE *pArena = (ARENA_INUSE *)ptr - 1;
        ret = pArena->size & ARENA_SIZE_MASK;
    }
    if (!(flags & HEAP_NO_SERIALIZE)) RtlLeaveCriticalSection( &heapPtr->critSection );

1450
    TRACE("(%p,%08lx,%08lx): returning %08lx\n",
1451 1452 1453 1454 1455 1456 1457
                  heap, flags, (DWORD)ptr, ret );
    return ret;
}


/***********************************************************************
 *           RtlValidateHeap   (NTDLL.@)
Jon Griffiths's avatar
Jon Griffiths committed
1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468
 *
 * Determine if a block is a valid alloction from a heap.
 *
 * PARAMS
 *  heap  [I] Heap that block was allocated from
 *  flags [I] HEAP_ flags from "winnt.h"
 *  ptr   [I] Block to check
 *
 * RETURNS
 *  Success: TRUE. The block was allocated from heap.
 *  Failure: FALSE, if heap is invalid or ptr was not allocated from it.
1469
 */
Jon Griffiths's avatar
Jon Griffiths committed
1470
BOOLEAN WINAPI RtlValidateHeap( HANDLE heap, ULONG flags, LPCVOID ptr )
1471 1472 1473
{
    HEAP *heapPtr = HEAP_GetPtr( heap );
    if (!heapPtr) return FALSE;
Jon Griffiths's avatar
Jon Griffiths committed
1474
    return HEAP_IsRealArena( heapPtr, flags, ptr, QUIET );
1475 1476 1477 1478 1479 1480
}


/***********************************************************************
 *           RtlWalkHeap    (NTDLL.@)
 *
Jon Griffiths's avatar
Jon Griffiths committed
1481 1482 1483
 * FIXME
 *  The PROCESS_HEAP_ENTRY flag values seem different between this
 *  function and HeapWalk(). To be checked.
1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497
 */
NTSTATUS WINAPI RtlWalkHeap( HANDLE heap, PVOID entry_ptr )
{
    LPPROCESS_HEAP_ENTRY entry = entry_ptr; /* FIXME */
    HEAP *heapPtr = HEAP_GetPtr(heap);
    SUBHEAP *sub, *currentheap = NULL;
    NTSTATUS ret;
    char *ptr;
    int region_index = 0;

    FIXME( "not fully compatible\n" );

    if (!heapPtr || !entry) return STATUS_INVALID_PARAMETER;

1498
    if (!(heapPtr->flags & HEAP_NO_SERIALIZE)) RtlEnterCriticalSection( &heapPtr->critSection );
1499 1500 1501 1502 1503

    /* set ptr to the next arena to be examined */

    if (!entry->lpData) /* first call (init) ? */
    {
Patrik Stridvall's avatar
Patrik Stridvall committed
1504
        TRACE("begin walking of heap %p.\n", heap);
1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585
        currentheap = &heapPtr->subheap;
        ptr = (char*)currentheap + currentheap->headerSize;
    }
    else
    {
        ptr = entry->lpData;
        sub = &heapPtr->subheap;
        while (sub)
        {
            if (((char *)ptr >= (char *)sub) &&
                ((char *)ptr < (char *)sub + sub->size))
            {
                currentheap = sub;
                break;
            }
            sub = sub->next;
            region_index++;
        }
        if (currentheap == NULL)
        {
            ERR("no matching subheap found, shouldn't happen !\n");
            ret = STATUS_NO_MORE_ENTRIES;
            goto HW_end;
        }

        ptr += entry->cbData; /* point to next arena */
        if (ptr > (char *)currentheap + currentheap->size - 1)
        {   /* proceed with next subheap */
            if (!(currentheap = currentheap->next))
            {  /* successfully finished */
                TRACE("end reached.\n");
                ret = STATUS_NO_MORE_ENTRIES;
                goto HW_end;
            }
            ptr = (char*)currentheap + currentheap->headerSize;
        }
    }

    entry->wFlags = 0;
    if (*(DWORD *)ptr & ARENA_FLAG_FREE)
    {
        ARENA_FREE *pArena = (ARENA_FREE *)ptr;

        /*TRACE("free, magic: %04x\n", pArena->magic);*/

        entry->lpData = pArena + 1;
        entry->cbData = pArena->size & ARENA_SIZE_MASK;
        entry->cbOverhead = sizeof(ARENA_FREE);
        entry->wFlags = PROCESS_HEAP_UNCOMMITTED_RANGE;
    }
    else
    {
        ARENA_INUSE *pArena = (ARENA_INUSE *)ptr;

        /*TRACE("busy, magic: %04x\n", pArena->magic);*/

        entry->lpData = pArena + 1;
        entry->cbData = pArena->size & ARENA_SIZE_MASK;
        entry->cbOverhead = sizeof(ARENA_INUSE);
        entry->wFlags = PROCESS_HEAP_ENTRY_BUSY;
        /* FIXME: can't handle PROCESS_HEAP_ENTRY_MOVEABLE
        and PROCESS_HEAP_ENTRY_DDESHARE yet */
    }

    entry->iRegionIndex = region_index;

    /* first element of heap ? */
    if (ptr == (char *)(currentheap + currentheap->headerSize))
    {
        entry->wFlags |= PROCESS_HEAP_REGION;
        entry->u.Region.dwCommittedSize = currentheap->commitSize;
        entry->u.Region.dwUnCommittedSize =
                currentheap->size - currentheap->commitSize;
        entry->u.Region.lpFirstBlock = /* first valid block */
                currentheap + currentheap->headerSize;
        entry->u.Region.lpLastBlock  = /* first invalid block */
                currentheap + currentheap->size;
    }
    ret = STATUS_SUCCESS;

HW_end:
1586
    if (!(heapPtr->flags & HEAP_NO_SERIALIZE)) RtlLeaveCriticalSection( &heapPtr->critSection );
1587 1588 1589 1590 1591 1592
    return ret;
}


/***********************************************************************
 *           RtlGetProcessHeaps    (NTDLL.@)
Jon Griffiths's avatar
Jon Griffiths committed
1593 1594 1595 1596 1597 1598 1599 1600 1601 1602
 *
 * Get the Heaps belonging to the current process.
 *
 * PARAMS
 *  count [I] size of heaps
 *  heaps [O] Destination array for heap HANDLE's
 *
 * RETURNS
 *  Success: The number of Heaps allocated by the process.
 *  Failure: 0.
1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620
 */
ULONG WINAPI RtlGetProcessHeaps( ULONG count, HANDLE *heaps )
{
    DWORD total;
    HEAP *ptr;

    if (!processHeap) return 0;  /* should never happen */
    total = 1;  /* main heap */
    RtlLockHeap( processHeap );
    for (ptr = firstHeap; ptr; ptr = ptr->next) total++;
    if (total <= count)
    {
        *heaps++ = (HANDLE)processHeap;
        for (ptr = firstHeap; ptr; ptr = ptr->next) *heaps++ = (HANDLE)ptr;
    }
    RtlUnlockHeap( processHeap );
    return total;
}