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wine/dlls/ntdll/heap.c
Uwe Bonnes bfb6d642dd Dump HeapWalk entries.
2005-03-03 13:50:21 +00:00

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/*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "config.h"
#include <assert.h>
#include <stdlib.h>
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#ifdef HAVE_VALGRIND_MEMCHECK_H
#include <valgrind/memcheck.h>
#endif
#define NONAMELESSUNION
#define NONAMELESSSTRUCT
#include "ntstatus.h"
#include "windef.h"
#include "winbase.h"
#include "winreg.h"
#include "winternl.h"
#include "wine/winbase16.h"
#include "winerror.h"
#include "winnt.h"
#include "thread.h"
#include "wine/debug.h"
#include "winternl.h"
#include "wine/server_protocol.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.
*/
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
#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 */
#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 );
/* 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 );
}
/***********************************************************************
* 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",
(DWORD)&heap->freeList[i].arena, heap->freeList[i].size,
(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 );
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;
}
}
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: %08lx\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:%08lx\n",entry->u.Region.dwCommittedSize);
TRACE( "Region.dwUnCommittedSize\t:%08lx\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;
while (pEntry->size < pArena->size) pEntry++;
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;
}
/***********************************************************************
* 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)) return (SUBHEAP*)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;
size -= subheap->commitSize;
ptr = (char *)subheap + subheap->commitSize;
if (NtAllocateVirtualMemory( NtCurrentProcess(), &ptr, 0,
&size, MEM_COMMIT, PAGE_EXECUTE_READWRITE))
{
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;
ULONG decommit_size;
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;
decommit_size = subheap->commitSize - size;
addr = (char *)subheap + size;
if (NtFreeVirtualMemory( NtCurrentProcess(), &addr, &decommit_size, MEM_DECOMMIT ))
{
WARN("Could not decommit %08lx bytes at %08lx for heap %p\n",
decommit_size, (DWORD)((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, DWORD 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);
pNext->next->prev = pNext->prev;
pNext->prev->next = pNext->next;
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;
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))
{
ULONG size = 0;
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;
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, 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 )
{
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, PAGE_EXECUTE_READWRITE))
{
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->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 );
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;
}
}
/* 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,
DWORD commitSize, DWORD 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, PAGE_EXECUTE_READWRITE ))
{
WARN("Could not allocate %08lx bytes\n", totalSize );
return NULL;
}
}
/* Initialize subheap */
if (!HEAP_InitSubHeap( heap ? heap : (HEAP *)address,
address, flags, commitSize, totalSize ))
{
ULONG 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, 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() */
size += ROUND_SIZE(sizeof(SUBHEAP)) + sizeof(ARENA_INUSE) + HEAP_MIN_BLOCK_SIZE;
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( const HEAP *heap, const void *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 )
{
char *heapEnd = (char *)subheap + subheap->size;
/* Check for unaligned pointers */
if ( (long)pArena % ALIGNMENT != 0 )
{
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))
{
ERR("Heap %08lx: next arena %08lx invalid for %08lx\n",
(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))
{
/* this often means that the prev arena got overwritten
* by a memory write before that prev arena */
ERR("Heap %08lx: prev arena %08lx invalid for %08lx\n",
(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( const SUBHEAP *subheap, const ARENA_INUSE *pArena, BOOL quiet )
{
const char *heapEnd = (const char *)subheap + subheap->size;
/* Check for unaligned pointers */
if ( (long)pArena % ALIGNMENT != 0 )
{
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 */
if (pArena->size & ARENA_FLAG_FREE)
{
ERR("Heap %08lx: bad flags %lx for in-use arena %08lx\n",
(DWORD)subheap->heap, pArena->size & ~ARENA_SIZE_MASK, (DWORD)pArena );
return FALSE;
}
/* Check arena size */
if ((const 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 (((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 %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)
{
const ARENA_FREE *pPrev = *((const ARENA_FREE * const*)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))
{
ERR("Heap %08lx: prev arena %08lx invalid for in-use %08lx\n",
(DWORD)subheap->heap, (DWORD)pPrev, (DWORD)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 %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 )) ||
((const char *)block < (char *)subheap + subheap->headerSize
+ sizeof(ARENA_INUSE)))
{
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, (const 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.@)
*
* 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, 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 );
}
else processHeap = subheap->heap; /* assume the first heap we create is the process main heap */
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 */
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;
ULONG 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, 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;
size = ROUND_SIZE(size);
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 )))
{
TRACE("(%p,%08lx,%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 */
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)
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,%08lx,%08lx): returning %08lx\n",
heap, flags, size, (DWORD)(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 );
if (!HEAP_IsRealArena( heapPtr, HEAP_NO_SERIALIZE, ptr, QUIET ))
{
if (!(flags & HEAP_NO_SERIALIZE)) RtlLeaveCriticalSection( &heapPtr->critSection );
RtlSetLastWin32ErrorAndNtStatusFromNtStatus( STATUS_INVALID_PARAMETER );
TRACE("(%p,%08lx,%08lx): returning FALSE\n",
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 );
TRACE("(%p,%08lx,%08lx): returning TRUE\n",
heap, flags, (DWORD)ptr );
return TRUE;
}
/***********************************************************************
* 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, ULONG size )
{
ARENA_INUSE *pArena;
DWORD oldSize;
HEAP *heapPtr;
SUBHEAP *subheap;
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;
size = ROUND_SIZE(size);
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 );
RtlSetLastWin32ErrorAndNtStatusFromNtStatus( STATUS_INVALID_PARAMETER );
TRACE("(%p,%08lx,%08lx,%08lx): returning NULL\n",
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 );
RtlSetLastWin32ErrorAndNtStatusFromNtStatus( 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 );
RtlSetLastWin32ErrorAndNtStatusFromNtStatus( 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 );
mark_block_initialized( pInUse + 1, oldSize );
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)
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,%08lx,%08lx,%08lx): returning %08lx\n",
heap, flags, (DWORD)ptr, size, (DWORD)(pArena + 1) );
return (LPVOID)(pArena + 1);
}
/***********************************************************************
* 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().
*/
ULONG WINAPI RtlSizeHeap( HANDLE heap, ULONG flags, PVOID ptr )
{
DWORD ret;
HEAP *heapPtr = HEAP_GetPtr( heap );
if (!heapPtr)
{
RtlSetLastWin32ErrorAndNtStatusFromNtStatus( 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 ))
{
RtlSetLastWin32ErrorAndNtStatusFromNtStatus( 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 );
TRACE("(%p,%08lx,%08lx): returning %08lx\n",
heap, flags, (DWORD)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;
}
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 )
{
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;
}
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