/* * Win32 heap functions * * Copyright 1996 Alexandre Julliard * Copyright 1998 Ulrich Weigand * * 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA */ #include "config.h" #include #include #include #include #include #ifdef HAVE_VALGRIND_MEMCHECK_H #include #endif #define NONAMELESSUNION #define NONAMELESSSTRUCT #include "ntstatus.h" #define WIN32_NO_STATUS #include "windef.h" #include "winternl.h" #include "winnt.h" #include "winternl.h" #include "wine/list.h" #include "wine/debug.h" #include "wine/server.h" WINE_DEFAULT_DEBUG_CHANNEL(heap); /* 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. */ /* FIXME: use SIZE_T for 'size' structure members, but we need to make sure * that there is no unaligned accesses to structure fields. */ typedef struct tagARENA_INUSE { DWORD size; /* Block size; must be the first field */ DWORD magic : 24; /* Magic number */ 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) */ } ARENA_INUSE; typedef struct tagARENA_FREE { DWORD size; /* Block size; must be the first field */ DWORD magic; /* Magic number */ struct list entry; /* Entry in free list */ } 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 0x455355 /* 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 #define ALIGNMENT 8 /* everything is aligned on 8 byte boundaries */ #define ROUND_SIZE(size) (((size) + ALIGNMENT - 1) & ~(ALIGNMENT-1)) #define QUIET 1 /* Suppress messages */ #define NOISY 0 /* Report all errors */ /* minimum data size (without arenas) of an allocated block */ /* make sure that it's larger than a free list entry */ #define HEAP_MIN_DATA_SIZE (2 * sizeof(struct list)) /* minimum size that must remain to shrink an allocated block */ #define HEAP_MIN_SHRINK_SIZE (HEAP_MIN_DATA_SIZE+sizeof(ARENA_FREE)) /* Max size of the blocks on the free lists */ static const DWORD HEAP_freeListSizes[] = { 0x10, 0x20, 0x30, 0x40, 0x60, 0x80, 0x100, 0x200, 0x400, 0x1000, ~0UL }; #define HEAP_NB_FREE_LISTS (sizeof(HEAP_freeListSizes)/sizeof(HEAP_freeListSizes[0])) typedef struct { 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 list entry; /* Entry in process heap list */ RTL_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 COMMIT_MASK 0xffff /* bitmask for commit/decommit granularity */ static HEAP *processHeap; /* main process heap */ static BOOL HEAP_IsRealArena( HEAP *heapPtr, DWORD flags, LPCVOID block, BOOL quiet ); /* 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 ); } /* notify that a new block of memory has been allocated for debugging purposes */ static inline void notify_alloc( void *ptr, SIZE_T size, BOOL init ) { #ifdef VALGRIND_MALLOCLIKE_BLOCK VALGRIND_MALLOCLIKE_BLOCK( ptr, size, 0, init ); #endif } /* notify that a block of memory has been freed for debugging purposes */ static inline void notify_free( void *ptr ) { #ifdef VALGRIND_FREELIKE_BLOCK VALGRIND_FREELIKE_BLOCK( ptr, 0 ); #endif } /* locate a free list entry of the appropriate size */ /* size is the size of the whole block including the arena header */ static inline unsigned int get_freelist_index( SIZE_T size ) { unsigned int i; size -= sizeof(ARENA_FREE); for (i = 0; i < HEAP_NB_FREE_LISTS - 1; i++) if (size <= HEAP_freeListSizes[i]) break; return i; } /* get the memory protection type to use for a given heap */ static inline ULONG get_protection_type( DWORD flags ) { return (flags & HEAP_CREATE_ENABLE_EXECUTE) ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE; } static RTL_CRITICAL_SECTION_DEBUG process_heap_critsect_debug = { 0, 0, NULL, /* will be set later */ { &process_heap_critsect_debug.ProcessLocksList, &process_heap_critsect_debug.ProcessLocksList }, 0, 0, { (DWORD_PTR)(__FILE__ ": main process heap section") } }; /*********************************************************************** * HEAP_Dump */ static void HEAP_Dump( HEAP *heap ) { int i; SUBHEAP *subheap; char *ptr; DPRINTF( "Heap: %p\n", heap ); DPRINTF( "Next: %p Sub-heaps: %p", LIST_ENTRY( heap->entry.next, HEAP, entry ), &heap->subheap ); subheap = &heap->subheap; while (subheap->next) { DPRINTF( " -> %p", subheap->next ); subheap = subheap->next; } DPRINTF( "\nFree lists:\n Block Stat Size Id\n" ); for (i = 0; i < HEAP_NB_FREE_LISTS; i++) DPRINTF( "%p free %08x prev=%p next=%p\n", &heap->freeList[i].arena, HEAP_freeListSizes[i], LIST_ENTRY( heap->freeList[i].arena.entry.prev, ARENA_FREE, entry ), LIST_ENTRY( heap->freeList[i].arena.entry.next, ARENA_FREE, entry )); subheap = &heap->subheap; while (subheap) { SIZE_T freeSize = 0, usedSize = 0, arenaSize = subheap->headerSize; DPRINTF( "\n\nSub-heap %p: size=%08x committed=%08x\n", subheap, subheap->size, subheap->commitSize ); 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( "%p free %08x prev=%p next=%p\n", pArena, pArena->size & ARENA_SIZE_MASK, LIST_ENTRY( pArena->entry.prev, ARENA_FREE, entry ), LIST_ENTRY( pArena->entry.next, ARENA_FREE, entry ) ); 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( "%p Used %08x back=%p\n", pArena, pArena->size & ARENA_SIZE_MASK, *((ARENA_FREE **)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( "%p used %08x\n", 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=%08x Committed=%08x Free=%08lx Used=%08lx Arenas=%08lx (%ld%%)\n\n", subheap->size, subheap->commitSize, freeSize, usedSize, arenaSize, (arenaSize * 100) / subheap->size ); subheap = subheap->next; } } static void HEAP_DumpEntry( LPPROCESS_HEAP_ENTRY entry ) { WORD rem_flags; TRACE( "Dumping entry %p\n", entry ); TRACE( "lpData\t\t: %p\n", entry->lpData ); TRACE( "cbData\t\t: %08x\n", entry->cbData); TRACE( "cbOverhead\t: %08x\n", entry->cbOverhead); TRACE( "iRegionIndex\t: %08x\n", entry->iRegionIndex); TRACE( "WFlags\t\t: "); if (entry->wFlags & PROCESS_HEAP_REGION) TRACE( "PROCESS_HEAP_REGION "); if (entry->wFlags & PROCESS_HEAP_UNCOMMITTED_RANGE) TRACE( "PROCESS_HEAP_UNCOMMITTED_RANGE "); if (entry->wFlags & PROCESS_HEAP_ENTRY_BUSY) TRACE( "PROCESS_HEAP_ENTRY_BUSY "); if (entry->wFlags & PROCESS_HEAP_ENTRY_MOVEABLE) TRACE( "PROCESS_HEAP_ENTRY_MOVEABLE "); if (entry->wFlags & PROCESS_HEAP_ENTRY_DDESHARE) TRACE( "PROCESS_HEAP_ENTRY_DDESHARE "); rem_flags = entry->wFlags & ~(PROCESS_HEAP_REGION | PROCESS_HEAP_UNCOMMITTED_RANGE | PROCESS_HEAP_ENTRY_BUSY | PROCESS_HEAP_ENTRY_MOVEABLE| PROCESS_HEAP_ENTRY_DDESHARE); if (rem_flags) TRACE( "Unknown %08x", rem_flags); TRACE( "\n"); if ((entry->wFlags & PROCESS_HEAP_ENTRY_BUSY ) && (entry->wFlags & PROCESS_HEAP_ENTRY_MOVEABLE)) { /* Treat as block */ TRACE( "BLOCK->hMem\t\t:%p\n", entry->u.Block.hMem); } if (entry->wFlags & PROCESS_HEAP_REGION) { TRACE( "Region.dwCommittedSize\t:%08x\n",entry->u.Region.dwCommittedSize); TRACE( "Region.dwUnCommittedSize\t:%08x\n",entry->u.Region.dwUnCommittedSize); TRACE( "Region.lpFirstBlock\t:%p\n",entry->u.Region.lpFirstBlock); TRACE( "Region.lpLastBlock\t:%p\n",entry->u.Region.lpLastBlock); } } /*********************************************************************** * 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)) { ERR("Invalid heap %p!\n", heap ); 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. */ static inline void HEAP_InsertFreeBlock( HEAP *heap, ARENA_FREE *pArena, BOOL last ) { FREE_LIST_ENTRY *pEntry = heap->freeList + get_freelist_index( pArena->size + sizeof(*pArena) ); 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; list_add_before( &pEntry->arena.entry, &pArena->entry ); } else { /* insert at head of free list */ list_add_after( &pEntry->arena.entry, &pArena->entry ); } pArena->size |= ARENA_FLAG_FREE; } /*********************************************************************** * HEAP_FindSubHeap * Find the sub-heap containing a given address. * * RETURNS * Pointer: Success * NULL: Failure */ static SUBHEAP *HEAP_FindSubHeap( const HEAP *heap, /* [in] Heap pointer */ LPCVOID ptr /* [in] Address */ ) { const SUBHEAP *sub = &heap->subheap; while (sub) { if (((const char *)ptr >= (const char *)sub) && ((const char *)ptr < (const char *)sub + sub->size - sizeof(ARENA_INUSE))) return (SUBHEAP *)sub; sub = sub->next; } return NULL; } /*********************************************************************** * HEAP_Commit * * Make sure the heap storage is committed for a given size in the specified arena. */ static inline BOOL HEAP_Commit( SUBHEAP *subheap, ARENA_INUSE *pArena, SIZE_T data_size ) { void *ptr = (char *)(pArena + 1) + data_size + sizeof(ARENA_FREE); SIZE_T size = (char *)ptr - (char *)subheap; size = (size + COMMIT_MASK) & ~COMMIT_MASK; if (size > subheap->size) size = subheap->size; if (size <= subheap->commitSize) return TRUE; size -= subheap->commitSize; ptr = (char *)subheap + subheap->commitSize; if (NtAllocateVirtualMemory( NtCurrentProcess(), &ptr, 0, &size, MEM_COMMIT, get_protection_type( subheap->heap->flags ) )) { WARN("Could not commit %08lx bytes at %p for heap %p\n", size, ptr, subheap->heap ); return FALSE; } subheap->commitSize += size; return TRUE; } /*********************************************************************** * HEAP_Decommit * * If possible, decommit the heap storage from (including) 'ptr'. */ static inline BOOL HEAP_Decommit( SUBHEAP *subheap, void *ptr ) { void *addr; SIZE_T decommit_size; SIZE_T size = (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; decommit_size = subheap->commitSize - size; addr = (char *)subheap + size; if (NtFreeVirtualMemory( NtCurrentProcess(), &addr, &decommit_size, MEM_DECOMMIT )) { WARN("Could not decommit %08lx bytes at %p for heap %p\n", decommit_size, (char *)subheap + size, subheap->heap ); return FALSE; } subheap->commitSize -= decommit_size; 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, SIZE_T size ) { ARENA_FREE *pFree; char *pEnd; BOOL last; /* Create a free arena */ mark_block_uninitialized( ptr, sizeof( ARENA_FREE ) ); pFree = (ARENA_FREE *)ptr; pFree->magic = ARENA_FREE_MAGIC; /* If debugging, erase the freed block content */ 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) ); /* 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); list_remove( &pNext->entry ); size += (pNext->size & ARENA_SIZE_MASK) + sizeof(*pNext); mark_block_free( pNext, sizeof(ARENA_FREE) ); } /* Set the next block PREV_FREE flag and pointer */ last = ((char *)ptr + size >= (char *)subheap + subheap->size); if (!last) { DWORD *pNext = (DWORD *)((char *)ptr + size); *pNext |= ARENA_FLAG_PREV_FREE; mark_block_initialized( pNext - 1, sizeof( ARENA_FREE * ) ); *((ARENA_FREE **)pNext - 1) = pFree; } /* Last, insert the new block into the free list */ pFree->size = size - sizeof(*pFree); HEAP_InsertFreeBlock( subheap->heap, pFree, last ); } /*********************************************************************** * 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; SIZE_T 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 */ list_remove( &pFree->entry ); } 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)) { SIZE_T size = 0; SUBHEAP *pPrev = &subheap->heap->subheap; /* Remove the free block from the list */ list_remove( &pFree->entry ); /* 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; NtFreeVirtualMemory( NtCurrentProcess(), (void **)&subheap, &size, MEM_RELEASE ); 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, SIZE_T size) { if ((pArena->size & ARENA_SIZE_MASK) >= size + HEAP_MIN_SHRINK_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, SIZE_T commitSize, SIZE_T totalSize ) { SUBHEAP *subheap; FREE_LIST_ENTRY *pEntry; int i; /* Commit memory */ if (flags & HEAP_SHARED) commitSize = totalSize; /* always commit everything in a shared heap */ if (NtAllocateVirtualMemory( NtCurrentProcess(), &address, 0, &commitSize, MEM_COMMIT, get_protection_type( flags ) )) { WARN("Could not commit %08lx bytes for sub-heap %p\n", commitSize, address ); return FALSE; } /* Fill the sub-heap structure */ subheap = (SUBHEAP *)address; 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 */ subheap->headerSize = ROUND_SIZE( sizeof(SUBHEAP) ); subheap->next = heap->subheap.next; heap->subheap.next = subheap; } else { /* If this is a primary subheap, initialize main heap */ subheap->headerSize = ROUND_SIZE( sizeof(HEAP) ); subheap->next = NULL; heap->flags = flags; heap->magic = HEAP_MAGIC; /* Build the free lists */ list_init( &heap->freeList[0].arena.entry ); for (i = 0, pEntry = heap->freeList; i < HEAP_NB_FREE_LISTS; i++, pEntry++) { pEntry->arena.size = 0 | ARENA_FLAG_FREE; pEntry->arena.magic = ARENA_FREE_MAGIC; if (i) list_add_after( &pEntry[-1].arena.entry, &pEntry->arena.entry ); } /* Initialize critical section */ if (!processHeap) /* do it by hand to avoid memory allocations */ { heap->critSection.DebugInfo = &process_heap_critsect_debug; heap->critSection.LockCount = -1; heap->critSection.RecursionCount = 0; heap->critSection.OwningThread = 0; heap->critSection.LockSemaphore = 0; heap->critSection.SpinCount = 0; process_heap_critsect_debug.CriticalSection = &heap->critSection; } else { RtlInitializeCriticalSection( &heap->critSection ); heap->critSection.DebugInfo->Spare[0] = (DWORD_PTR)(__FILE__ ": HEAP.critSection"); } if (flags & HEAP_SHARED) { /* 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( NtCurrentProcess(), sem, NtCurrentProcess(), &sem, 0, 0, DUP_HANDLE_MAKE_GLOBAL | DUP_HANDLE_SAME_ACCESS | DUP_HANDLE_CLOSE_SOURCE ); heap->critSection.LockSemaphore = sem; RtlFreeHeap( processHeap, 0, heap->critSection.DebugInfo ); heap->critSection.DebugInfo = NULL; } } /* Create the first free block */ HEAP_CreateFreeBlock( subheap, (LPBYTE)subheap + subheap->headerSize, 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, SIZE_T commitSize, SIZE_T totalSize ) { LPVOID address = base; /* round-up sizes on a 64K boundary */ totalSize = (totalSize + 0xffff) & 0xffff0000; commitSize = (commitSize + 0xffff) & 0xffff0000; if (!commitSize) commitSize = 0x10000; if (totalSize < commitSize) totalSize = commitSize; if (!address) { /* allocate the memory block */ if (NtAllocateVirtualMemory( NtCurrentProcess(), &address, 0, &totalSize, MEM_RESERVE, get_protection_type( flags ) )) { WARN("Could not allocate %08lx bytes\n", totalSize ); return NULL; } } /* Initialize subheap */ if (!HEAP_InitSubHeap( heap ? heap : (HEAP *)address, address, flags, commitSize, totalSize )) { SIZE_T size = 0; if (!base) NtFreeVirtualMemory( NtCurrentProcess(), &address, &size, MEM_RELEASE ); 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, SIZE_T size, SUBHEAP **ppSubHeap ) { SUBHEAP *subheap; struct list *ptr; FREE_LIST_ENTRY *pEntry = heap->freeList + get_freelist_index( size + sizeof(ARENA_INUSE) ); /* Find a suitable free list, and in it find a block large enough */ ptr = &pEntry->arena.entry; while ((ptr = list_next( &heap->freeList[0].arena.entry, ptr ))) { ARENA_FREE *pArena = LIST_ENTRY( ptr, ARENA_FREE, entry ); SIZE_T 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, (ARENA_INUSE *)pArena, size )) return NULL; *ppSubHeap = subheap; return pArena; } } /* If no block was found, attempt to grow the heap */ if (!(heap->flags & HEAP_GROWABLE)) { WARN("Not enough space in heap %p for %08lx bytes\n", 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 used, and a second free arena that might get assigned all remaining * free space in HEAP_ShrinkBlock() */ size += ROUND_SIZE(sizeof(SUBHEAP)) + sizeof(ARENA_INUSE) + sizeof(ARENA_FREE); if (!(subheap = HEAP_CreateSubHeap( heap, NULL, heap->flags, size, max( HEAP_DEF_SIZE, size ) ))) return NULL; TRACE("created new sub-heap %p of %08lx bytes for heap %p\n", subheap, size, 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( const HEAP *heap, const ARENA_FREE *ptr ) { int i; const SUBHEAP *subheap = HEAP_FindSubHeap( heap, ptr ); if (!subheap) return FALSE; if ((const char *)ptr >= (const char *)subheap + subheap->headerSize) return TRUE; if (subheap != &heap->subheap) return FALSE; for (i = 0; i < HEAP_NB_FREE_LISTS; i++) if (ptr == (const void *)&heap->freeList[i].arena) return TRUE; return FALSE; } /*********************************************************************** * HEAP_ValidateFreeArena */ static BOOL HEAP_ValidateFreeArena( SUBHEAP *subheap, ARENA_FREE *pArena ) { ARENA_FREE *prev, *next; char *heapEnd = (char *)subheap + subheap->size; /* Check for unaligned pointers */ if ( (ULONG_PTR)pArena % ALIGNMENT != 0 ) { ERR("Heap %p: unaligned arena pointer %p\n", subheap->heap, pArena ); return FALSE; } /* Check magic number */ if (pArena->magic != ARENA_FREE_MAGIC) { ERR("Heap %p: invalid free arena magic for %p\n", subheap->heap, pArena ); return FALSE; } /* Check size flags */ if (!(pArena->size & ARENA_FLAG_FREE) || (pArena->size & ARENA_FLAG_PREV_FREE)) { ERR("Heap %p: bad flags %08x for free arena %p\n", subheap->heap, pArena->size & ~ARENA_SIZE_MASK, pArena ); return FALSE; } /* Check arena size */ if ((char *)(pArena + 1) + (pArena->size & ARENA_SIZE_MASK) > heapEnd) { ERR("Heap %p: bad size %08x for free arena %p\n", subheap->heap, pArena->size & ARENA_SIZE_MASK, pArena ); return FALSE; } /* Check that next pointer is valid */ next = LIST_ENTRY( pArena->entry.next, ARENA_FREE, entry ); if (!HEAP_IsValidArenaPtr( subheap->heap, next )) { ERR("Heap %p: bad next ptr %p for arena %p\n", subheap->heap, next, pArena ); return FALSE; } /* Check that next arena is free */ if (!(next->size & ARENA_FLAG_FREE) || (next->magic != ARENA_FREE_MAGIC)) { ERR("Heap %p: next arena %p invalid for %p\n", subheap->heap, next, pArena ); return FALSE; } /* Check that prev pointer is valid */ prev = LIST_ENTRY( pArena->entry.prev, ARENA_FREE, entry ); if (!HEAP_IsValidArenaPtr( subheap->heap, prev )) { ERR("Heap %p: bad prev ptr %p for arena %p\n", subheap->heap, prev, pArena ); return FALSE; } /* Check that prev arena is free */ if (!(prev->size & ARENA_FLAG_FREE) || (prev->magic != ARENA_FREE_MAGIC)) { /* this often means that the prev arena got overwritten * by a memory write before that prev arena */ ERR("Heap %p: prev arena %p invalid for %p\n", subheap->heap, prev, 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 %p: free arena %p next block has no PREV_FREE flag\n", subheap->heap, pArena ); return FALSE; } /* Check next block back pointer */ if (*((ARENA_FREE **)((char *)(pArena + 1) + (pArena->size & ARENA_SIZE_MASK)) - 1) != pArena) { ERR("Heap %p: arena %p has wrong back ptr %p\n", subheap->heap, pArena, *((ARENA_FREE **)((char *)(pArena+1) + (pArena->size & ARENA_SIZE_MASK)) - 1)); return FALSE; } } return TRUE; } /*********************************************************************** * HEAP_ValidateInUseArena */ static BOOL HEAP_ValidateInUseArena( const SUBHEAP *subheap, const ARENA_INUSE *pArena, BOOL quiet ) { const char *heapEnd = (const char *)subheap + subheap->size; /* Check for unaligned pointers */ if ( (ULONG_PTR)pArena % ALIGNMENT != 0 ) { if ( quiet == NOISY ) { ERR( "Heap %p: unaligned arena pointer %p\n", subheap->heap, pArena ); if ( TRACE_ON(heap) ) HEAP_Dump( subheap->heap ); } else if ( WARN_ON(heap) ) { WARN( "Heap %p: unaligned arena pointer %p\n", subheap->heap, 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 %p: invalid in-use arena magic for %p\n", subheap->heap, pArena ); if (TRACE_ON(heap)) HEAP_Dump( subheap->heap ); } else if (WARN_ON(heap)) { WARN("Heap %p: invalid in-use arena magic for %p\n", subheap->heap, pArena ); if (TRACE_ON(heap)) HEAP_Dump( subheap->heap ); } return FALSE; } /* Check size flags */ if (pArena->size & ARENA_FLAG_FREE) { ERR("Heap %p: bad flags %08x for in-use arena %p\n", subheap->heap, pArena->size & ~ARENA_SIZE_MASK, pArena ); return FALSE; } /* Check arena size */ if ((const char *)(pArena + 1) + (pArena->size & ARENA_SIZE_MASK) > heapEnd) { ERR("Heap %p: bad size %08x for in-use arena %p\n", subheap->heap, pArena->size & ARENA_SIZE_MASK, pArena ); return FALSE; } /* Check next arena PREV_FREE flag */ if (((const char *)(pArena + 1) + (pArena->size & ARENA_SIZE_MASK) < heapEnd) && (*(const DWORD *)((const char *)(pArena + 1) + (pArena->size & ARENA_SIZE_MASK)) & ARENA_FLAG_PREV_FREE)) { ERR("Heap %p: in-use arena %p next block has PREV_FREE flag\n", subheap->heap, pArena ); return FALSE; } /* Check prev free arena */ if (pArena->size & ARENA_FLAG_PREV_FREE) { const ARENA_FREE *pPrev = *((const ARENA_FREE * const*)pArena - 1); /* Check prev pointer */ if (!HEAP_IsValidArenaPtr( subheap->heap, pPrev )) { ERR("Heap %p: bad back ptr %p for arena %p\n", subheap->heap, pPrev, pArena ); return FALSE; } /* Check that prev arena is free */ if (!(pPrev->size & ARENA_FLAG_FREE) || (pPrev->magic != ARENA_FREE_MAGIC)) { ERR("Heap %p: prev arena %p invalid for in-use %p\n", subheap->heap, pPrev, pArena ); return FALSE; } /* Check that prev arena is really the previous block */ if ((const char *)(pPrev + 1) + (pPrev->size & ARENA_SIZE_MASK) != (const char *)pArena) { ERR("Heap %p: prev arena %p is not prev for in-use %p\n", subheap->heap, pPrev, 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; 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 */ { const ARENA_INUSE *arena = (const ARENA_INUSE *)block - 1; if (!(subheap = HEAP_FindSubHeap( heapPtr, arena )) || ((const char *)arena < (char *)subheap + subheap->headerSize)) { if (quiet == NOISY) ERR("Heap %p: block %p is not inside heap\n", heapPtr, block ); else if (WARN_ON(heap)) WARN("Heap %p: block %p is not inside heap\n", heapPtr, block ); ret = FALSE; } else ret = HEAP_ValidateInUseArena( subheap, arena, 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.@) * * 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. */ HANDLE WINAPI RtlCreateHeap( ULONG flags, PVOID addr, SIZE_T totalSize, SIZE_T 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; RtlEnterCriticalSection( &processHeap->critSection ); list_add_head( &processHeap->entry, &heapPtr->entry ); RtlLeaveCriticalSection( &processHeap->critSection ); } else { processHeap = subheap->heap; /* assume the first heap we create is the process main heap */ list_init( &processHeap->entry ); } return (HANDLE)subheap; } /*********************************************************************** * RtlDestroyHeap (NTDLL.@) * * 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. */ HANDLE WINAPI RtlDestroyHeap( HANDLE heap ) { HEAP *heapPtr = HEAP_GetPtr( heap ); SUBHEAP *subheap; TRACE("%p\n", heap ); if (!heapPtr) return heap; if (heap == processHeap) return heap; /* cannot delete the main process heap */ /* remove it from the per-process list */ RtlEnterCriticalSection( &processHeap->critSection ); list_remove( &heapPtr->entry ); RtlLeaveCriticalSection( &processHeap->critSection ); heapPtr->critSection.DebugInfo->Spare[0] = 0; RtlDeleteCriticalSection( &heapPtr->critSection ); subheap = &heapPtr->subheap; while (subheap) { SUBHEAP *next = subheap->next; SIZE_T size = 0; void *addr = subheap; NtFreeVirtualMemory( NtCurrentProcess(), &addr, &size, MEM_RELEASE ); subheap = next; } return 0; } /*********************************************************************** * RtlAllocateHeap (NTDLL.@) * * 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(). */ PVOID WINAPI RtlAllocateHeap( HANDLE heap, ULONG flags, SIZE_T size ) { ARENA_FREE *pArena; ARENA_INUSE *pInUse; SUBHEAP *subheap; HEAP *heapPtr = HEAP_GetPtr( heap ); SIZE_T rounded_size; /* Validate the parameters */ if (!heapPtr) return NULL; flags &= HEAP_GENERATE_EXCEPTIONS | HEAP_NO_SERIALIZE | HEAP_ZERO_MEMORY; flags |= heapPtr->flags; rounded_size = ROUND_SIZE(size); if (rounded_size < HEAP_MIN_DATA_SIZE) rounded_size = HEAP_MIN_DATA_SIZE; if (!(flags & HEAP_NO_SERIALIZE)) RtlEnterCriticalSection( &heapPtr->critSection ); /* Locate a suitable free block */ if (!(pArena = HEAP_FindFreeBlock( heapPtr, rounded_size, &subheap ))) { TRACE("(%p,%08x,%08lx): returning NULL\n", 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 */ list_remove( &pArena->entry ); /* 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, rounded_size ); pInUse->unused_bytes = (pInUse->size & ARENA_SIZE_MASK) - size; notify_alloc( pInUse + 1, size, flags & HEAP_ZERO_MEMORY ); if (flags & HEAP_ZERO_MEMORY) clear_block( pInUse + 1, pInUse->size & ARENA_SIZE_MASK ); else mark_block_uninitialized( pInUse + 1, pInUse->size & ARENA_SIZE_MASK ); if (!(flags & HEAP_NO_SERIALIZE)) RtlLeaveCriticalSection( &heapPtr->critSection ); TRACE("(%p,%08x,%08lx): returning %p\n", heap, flags, size, pInUse + 1 ); return (LPVOID)(pInUse + 1); } /*********************************************************************** * RtlFreeHeap (NTDLL.@) * * 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. */ BOOLEAN WINAPI RtlFreeHeap( HANDLE heap, ULONG flags, PVOID ptr ) { ARENA_INUSE *pInUse; SUBHEAP *subheap; HEAP *heapPtr; /* Validate the parameters */ if (!ptr) return TRUE; /* freeing a NULL ptr isn't an error in Win2k */ heapPtr = HEAP_GetPtr( heap ); if (!heapPtr) { RtlSetLastWin32ErrorAndNtStatusFromNtStatus( STATUS_INVALID_HANDLE ); return FALSE; } flags &= HEAP_NO_SERIALIZE; flags |= heapPtr->flags; if (!(flags & HEAP_NO_SERIALIZE)) RtlEnterCriticalSection( &heapPtr->critSection ); /* Some sanity checks */ pInUse = (ARENA_INUSE *)ptr - 1; if (!(subheap = HEAP_FindSubHeap( heapPtr, pInUse ))) goto error; if ((char *)pInUse < (char *)subheap + subheap->headerSize) goto error; if (!HEAP_ValidateInUseArena( subheap, pInUse, QUIET )) goto error; /* Turn the block into a free block */ notify_free( ptr ); HEAP_MakeInUseBlockFree( subheap, pInUse ); if (!(flags & HEAP_NO_SERIALIZE)) RtlLeaveCriticalSection( &heapPtr->critSection ); TRACE("(%p,%08x,%p): returning TRUE\n", heap, flags, ptr ); return TRUE; error: if (!(flags & HEAP_NO_SERIALIZE)) RtlLeaveCriticalSection( &heapPtr->critSection ); RtlSetLastWin32ErrorAndNtStatusFromNtStatus( STATUS_INVALID_PARAMETER ); TRACE("(%p,%08x,%p): returning FALSE\n", heap, flags, ptr ); return FALSE; } /*********************************************************************** * RtlReAllocateHeap (NTDLL.@) * * 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. */ PVOID WINAPI RtlReAllocateHeap( HANDLE heap, ULONG flags, PVOID ptr, SIZE_T size ) { ARENA_INUSE *pArena; HEAP *heapPtr; SUBHEAP *subheap; SIZE_T oldSize, rounded_size; if (!ptr) return NULL; if (!(heapPtr = HEAP_GetPtr( heap ))) { RtlSetLastWin32ErrorAndNtStatusFromNtStatus( STATUS_INVALID_HANDLE ); return NULL; } /* Validate the parameters */ flags &= HEAP_GENERATE_EXCEPTIONS | HEAP_NO_SERIALIZE | HEAP_ZERO_MEMORY | HEAP_REALLOC_IN_PLACE_ONLY; flags |= heapPtr->flags; rounded_size = ROUND_SIZE(size); if (rounded_size < HEAP_MIN_DATA_SIZE) rounded_size = HEAP_MIN_DATA_SIZE; if (!(flags & HEAP_NO_SERIALIZE)) RtlEnterCriticalSection( &heapPtr->critSection ); pArena = (ARENA_INUSE *)ptr - 1; if (!(subheap = HEAP_FindSubHeap( heapPtr, pArena ))) goto error; if ((char *)pArena < (char *)subheap + subheap->headerSize) goto error; if (!HEAP_ValidateInUseArena( subheap, pArena, QUIET )) goto error; /* Check if we need to grow the block */ oldSize = (pArena->size & ARENA_SIZE_MASK); if (rounded_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) >= rounded_size)) { /* The next block is free and large enough */ ARENA_FREE *pFree = (ARENA_FREE *)pNext; list_remove( &pFree->entry ); pArena->size += (pFree->size & ARENA_SIZE_MASK) + sizeof(*pFree); if (!HEAP_Commit( subheap, pArena, rounded_size )) { if (!(flags & HEAP_NO_SERIALIZE)) RtlLeaveCriticalSection( &heapPtr->critSection ); if (flags & HEAP_GENERATE_EXCEPTIONS) RtlRaiseStatus( STATUS_NO_MEMORY ); RtlSetLastWin32ErrorAndNtStatusFromNtStatus( STATUS_NO_MEMORY ); return NULL; } notify_free( pArena + 1 ); HEAP_ShrinkBlock( subheap, pArena, rounded_size ); notify_alloc( pArena + 1, size, FALSE ); /* FIXME: this is wrong as we may lose old VBits settings */ mark_block_initialized( pArena + 1, oldSize ); } 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, rounded_size, &newsubheap ))) { if (!(flags & HEAP_NO_SERIALIZE)) RtlLeaveCriticalSection( &heapPtr->critSection ); if (flags & HEAP_GENERATE_EXCEPTIONS) RtlRaiseStatus( STATUS_NO_MEMORY ); RtlSetLastWin32ErrorAndNtStatusFromNtStatus( STATUS_NO_MEMORY ); return NULL; } /* Build the in-use arena */ list_remove( &pNew->entry ); 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, rounded_size ); mark_block_initialized( pInUse + 1, oldSize ); notify_alloc( pInUse + 1, size, FALSE ); memcpy( pInUse + 1, pArena + 1, oldSize ); /* Free the previous block */ notify_free( pArena + 1 ); HEAP_MakeInUseBlockFree( subheap, pArena ); subheap = newsubheap; pArena = pInUse; } } else { /* Shrink the block */ notify_free( pArena + 1 ); HEAP_ShrinkBlock( subheap, pArena, rounded_size ); notify_alloc( pArena + 1, size, FALSE ); /* FIXME: this is wrong as we may lose old VBits settings */ mark_block_initialized( pArena + 1, size ); } pArena->unused_bytes = (pArena->size & ARENA_SIZE_MASK) - size; /* Clear the extra bytes if needed */ if (rounded_size > oldSize) { if (flags & HEAP_ZERO_MEMORY) 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 ); } /* Return the new arena */ if (!(flags & HEAP_NO_SERIALIZE)) RtlLeaveCriticalSection( &heapPtr->critSection ); TRACE("(%p,%08x,%p,%08lx): returning %p\n", heap, flags, ptr, size, pArena + 1 ); return (LPVOID)(pArena + 1); error: if (!(flags & HEAP_NO_SERIALIZE)) RtlLeaveCriticalSection( &heapPtr->critSection ); RtlSetLastWin32ErrorAndNtStatusFromNtStatus( STATUS_INVALID_PARAMETER ); TRACE("(%p,%08x,%p,%08lx): returning NULL\n", heap, flags, ptr, size ); return NULL; } /*********************************************************************** * RtlCompactHeap (NTDLL.@) * * 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. */ ULONG WINAPI RtlCompactHeap( HANDLE heap, ULONG flags ) { FIXME( "stub\n" ); return 0; } /*********************************************************************** * RtlLockHeap (NTDLL.@) * * Lock a Heap. * * PARAMS * heap [I] Heap to lock * * RETURNS * Success: TRUE. The Heap is locked. * Failure: FALSE, if heap is invalid. */ BOOLEAN WINAPI RtlLockHeap( HANDLE heap ) { HEAP *heapPtr = HEAP_GetPtr( heap ); if (!heapPtr) return FALSE; RtlEnterCriticalSection( &heapPtr->critSection ); return TRUE; } /*********************************************************************** * RtlUnlockHeap (NTDLL.@) * * Unlock a Heap. * * PARAMS * heap [I] Heap to unlock * * RETURNS * Success: TRUE. The Heap is unlocked. * Failure: FALSE, if heap is invalid. */ BOOLEAN WINAPI RtlUnlockHeap( HANDLE heap ) { HEAP *heapPtr = HEAP_GetPtr( heap ); if (!heapPtr) return FALSE; RtlLeaveCriticalSection( &heapPtr->critSection ); return TRUE; } /*********************************************************************** * RtlSizeHeap (NTDLL.@) * * 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(). */ SIZE_T WINAPI RtlSizeHeap( HANDLE heap, ULONG flags, const void *ptr ) { SIZE_T ret; HEAP *heapPtr = HEAP_GetPtr( heap ); if (!heapPtr) { RtlSetLastWin32ErrorAndNtStatusFromNtStatus( STATUS_INVALID_HANDLE ); return ~0UL; } flags &= HEAP_NO_SERIALIZE; flags |= heapPtr->flags; if (!(flags & HEAP_NO_SERIALIZE)) RtlEnterCriticalSection( &heapPtr->critSection ); if (!HEAP_IsRealArena( heapPtr, HEAP_NO_SERIALIZE, ptr, QUIET )) { RtlSetLastWin32ErrorAndNtStatusFromNtStatus( STATUS_INVALID_PARAMETER ); ret = ~0UL; } else { const ARENA_INUSE *pArena = (const ARENA_INUSE *)ptr - 1; ret = (pArena->size & ARENA_SIZE_MASK) - pArena->unused_bytes; } if (!(flags & HEAP_NO_SERIALIZE)) RtlLeaveCriticalSection( &heapPtr->critSection ); TRACE("(%p,%08x,%p): returning %08lx\n", heap, flags, ptr, ret ); return ret; } /*********************************************************************** * RtlValidateHeap (NTDLL.@) * * Determine if a block is a valid allocation 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. */ BOOLEAN WINAPI RtlValidateHeap( HANDLE heap, ULONG flags, LPCVOID ptr ) { HEAP *heapPtr = HEAP_GetPtr( heap ); if (!heapPtr) return FALSE; return HEAP_IsRealArena( heapPtr, flags, ptr, QUIET ); } /*********************************************************************** * RtlWalkHeap (NTDLL.@) * * FIXME * The PROCESS_HEAP_ENTRY flag values seem different between this * function and HeapWalk(). To be checked. */ 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; if (!heapPtr || !entry) return STATUS_INVALID_PARAMETER; if (!(heapPtr->flags & HEAP_NO_SERIALIZE)) RtlEnterCriticalSection( &heapPtr->critSection ); /* set ptr to the next arena to be examined */ if (!entry->lpData) /* first call (init) ? */ { TRACE("begin walking of heap %p.\n", heap); 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; } if (((ARENA_INUSE *)ptr - 1)->magic == ARENA_INUSE_MAGIC) { ARENA_INUSE *pArena = (ARENA_INUSE *)ptr - 1; ptr += pArena->size & ARENA_SIZE_MASK; } else if (((ARENA_FREE *)ptr - 1)->magic == ARENA_FREE_MAGIC) { ARENA_FREE *pArena = (ARENA_FREE *)ptr - 1; ptr += pArena->size & ARENA_SIZE_MASK; } else 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; if (TRACE_ON(heap)) HEAP_DumpEntry(entry); HW_end: if (!(heapPtr->flags & HEAP_NO_SERIALIZE)) RtlLeaveCriticalSection( &heapPtr->critSection ); return ret; } /*********************************************************************** * RtlGetProcessHeaps (NTDLL.@) * * 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. */ ULONG WINAPI RtlGetProcessHeaps( ULONG count, HANDLE *heaps ) { ULONG total = 1; /* main heap */ struct list *ptr; RtlEnterCriticalSection( &processHeap->critSection ); LIST_FOR_EACH( ptr, &processHeap->entry ) total++; if (total <= count) { *heaps++ = processHeap; LIST_FOR_EACH( ptr, &processHeap->entry ) *heaps++ = LIST_ENTRY( ptr, HEAP, entry ); } RtlLeaveCriticalSection( &processHeap->critSection ); return total; }