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Sweden-Number/dlls/msvcrt/heap.c

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/*
* msvcrt.dll heap functions
*
* Copyright 2000 Jon Griffiths
*
* 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
*
* Note: Win32 heap operations are MT safe. We only lock the new
* handler and non atomic heap operations
*/
#include "msvcrt.h"
#include "mtdll.h"
#include "msvcrt/errno.h"
#include "wine/debug.h"
WINE_DEFAULT_DEBUG_CHANNEL(msvcrt);
/* MT */
#define LOCK_HEAP _mlock( _HEAP_LOCK )
#define UNLOCK_HEAP _munlock( _HEAP_LOCK )
/* _aligned */
#define SAVED_PTR(x) ((void *)((DWORD_PTR)((char *)x - sizeof(void *)) & \
~(sizeof(void *) - 1)))
#define ALIGN_PTR(ptr, alignment, offset) ((void *) \
((((DWORD_PTR)((char *)ptr + alignment + sizeof(void *) + offset)) & \
~(alignment - 1)) - offset))
typedef void (*MSVCRT_new_handler_func)(unsigned long size);
static MSVCRT_new_handler_func MSVCRT_new_handler;
static int MSVCRT_new_mode;
/* FIXME - According to documentation it should be 8*1024, at runtime it returns 16 */
static unsigned int MSVCRT_amblksiz = 16;
/* FIXME - According to documentation it should be 480 bytes, at runtime default is 0 */
static MSVCRT_size_t MSVCRT_sbh_threshold = 0;
/*********************************************************************
* ??2@YAPAXI@Z (MSVCRT.@)
*/
void* CDECL MSVCRT_operator_new(unsigned long size)
{
void *retval = HeapAlloc(GetProcessHeap(), 0, size);
TRACE("(%ld) returning %p\n", size, retval);
if(retval) return retval;
LOCK_HEAP;
if(MSVCRT_new_handler)
(*MSVCRT_new_handler)(size);
UNLOCK_HEAP;
return retval;
}
/*********************************************************************
* ??3@YAXPAX@Z (MSVCRT.@)
*/
void CDECL MSVCRT_operator_delete(void *mem)
{
TRACE("(%p)\n", mem);
HeapFree(GetProcessHeap(), 0, mem);
}
/*********************************************************************
* ?_query_new_handler@@YAP6AHI@ZXZ (MSVCRT.@)
*/
MSVCRT_new_handler_func CDECL MSVCRT__query_new_handler(void)
{
return MSVCRT_new_handler;
}
/*********************************************************************
* ?_query_new_mode@@YAHXZ (MSVCRT.@)
*/
int CDECL MSVCRT__query_new_mode(void)
{
return MSVCRT_new_mode;
}
/*********************************************************************
* ?_set_new_handler@@YAP6AHI@ZP6AHI@Z@Z (MSVCRT.@)
*/
MSVCRT_new_handler_func CDECL MSVCRT__set_new_handler(MSVCRT_new_handler_func func)
{
MSVCRT_new_handler_func old_handler;
LOCK_HEAP;
old_handler = MSVCRT_new_handler;
MSVCRT_new_handler = func;
UNLOCK_HEAP;
return old_handler;
}
/*********************************************************************
* ?set_new_handler@@YAP6AXXZP6AXXZ@Z (MSVCRT.@)
*/
MSVCRT_new_handler_func CDECL MSVCRT_set_new_handler(void *func)
{
TRACE("(%p)\n",func);
MSVCRT__set_new_handler(NULL);
return NULL;
}
/*********************************************************************
* ?_set_new_mode@@YAHH@Z (MSVCRT.@)
*/
int CDECL MSVCRT__set_new_mode(int mode)
{
int old_mode;
LOCK_HEAP;
old_mode = MSVCRT_new_mode;
MSVCRT_new_mode = mode;
UNLOCK_HEAP;
return old_mode;
}
/*********************************************************************
* _callnewh (MSVCRT.@)
*/
int CDECL _callnewh(unsigned long size)
{
if(MSVCRT_new_handler)
(*MSVCRT_new_handler)(size);
return 0;
}
/*********************************************************************
* _expand (MSVCRT.@)
*/
void* CDECL _expand(void* mem, MSVCRT_size_t size)
{
return HeapReAlloc(GetProcessHeap(), HEAP_REALLOC_IN_PLACE_ONLY, mem, size);
}
/*********************************************************************
* _heapchk (MSVCRT.@)
*/
int CDECL _heapchk(void)
{
if (!HeapValidate( GetProcessHeap(), 0, NULL))
{
msvcrt_set_errno(GetLastError());
return MSVCRT__HEAPBADNODE;
}
return MSVCRT__HEAPOK;
}
/*********************************************************************
* _heapmin (MSVCRT.@)
*/
int CDECL _heapmin(void)
{
if (!HeapCompact( GetProcessHeap(), 0 ))
{
if (GetLastError() != ERROR_CALL_NOT_IMPLEMENTED)
msvcrt_set_errno(GetLastError());
return -1;
}
return 0;
}
/*********************************************************************
* _heapwalk (MSVCRT.@)
*/
int CDECL _heapwalk(struct MSVCRT__heapinfo* next)
{
PROCESS_HEAP_ENTRY phe;
LOCK_HEAP;
phe.lpData = next->_pentry;
phe.cbData = next->_size;
phe.wFlags = next->_useflag == MSVCRT__USEDENTRY ? PROCESS_HEAP_ENTRY_BUSY : 0;
if (phe.lpData && phe.wFlags & PROCESS_HEAP_ENTRY_BUSY &&
!HeapValidate( GetProcessHeap(), 0, phe.lpData ))
{
UNLOCK_HEAP;
msvcrt_set_errno(GetLastError());
return MSVCRT__HEAPBADNODE;
}
do
{
if (!HeapWalk( GetProcessHeap(), &phe ))
{
UNLOCK_HEAP;
if (GetLastError() == ERROR_NO_MORE_ITEMS)
return MSVCRT__HEAPEND;
msvcrt_set_errno(GetLastError());
if (!phe.lpData)
return MSVCRT__HEAPBADBEGIN;
return MSVCRT__HEAPBADNODE;
}
} while (phe.wFlags & (PROCESS_HEAP_REGION|PROCESS_HEAP_UNCOMMITTED_RANGE));
UNLOCK_HEAP;
next->_pentry = phe.lpData;
next->_size = phe.cbData;
next->_useflag = phe.wFlags & PROCESS_HEAP_ENTRY_BUSY ? MSVCRT__USEDENTRY : MSVCRT__FREEENTRY;
return MSVCRT__HEAPOK;
}
/*********************************************************************
* _heapset (MSVCRT.@)
*/
int CDECL _heapset(unsigned int value)
{
int retval;
struct MSVCRT__heapinfo heap;
memset( &heap, 0, sizeof(heap) );
LOCK_HEAP;
while ((retval = _heapwalk(&heap)) == MSVCRT__HEAPOK)
{
if (heap._useflag == MSVCRT__FREEENTRY)
memset(heap._pentry, value, heap._size);
}
UNLOCK_HEAP;
return retval == MSVCRT__HEAPEND? MSVCRT__HEAPOK : retval;
}
/*********************************************************************
* _heapadd (MSVCRT.@)
*/
int CDECL _heapadd(void* mem, MSVCRT_size_t size)
{
TRACE("(%p,%d) unsupported in Win32\n", mem,size);
*MSVCRT__errno() = MSVCRT_ENOSYS;
return -1;
}
/*********************************************************************
* _msize (MSVCRT.@)
*/
MSVCRT_size_t CDECL _msize(void* mem)
{
long size = HeapSize(GetProcessHeap(),0,mem);
if (size == -1)
{
WARN(":Probably called with non wine-allocated memory, ret = -1\n");
/* At least the Win32 crtdll/msvcrt also return -1 in this case */
}
return size;
}
/*********************************************************************
* calloc (MSVCRT.@)
*/
void* CDECL MSVCRT_calloc(MSVCRT_size_t size, MSVCRT_size_t count)
{
return HeapAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY, size * count );
}
/*********************************************************************
* free (MSVCRT.@)
*/
void CDECL MSVCRT_free(void* ptr)
{
HeapFree(GetProcessHeap(),0,ptr);
}
/*********************************************************************
* malloc (MSVCRT.@)
*/
void* CDECL MSVCRT_malloc(MSVCRT_size_t size)
{
void *ret = HeapAlloc(GetProcessHeap(),0,size);
if (!ret)
msvcrt_set_errno(MSVCRT_ENOMEM);
return ret;
}
/*********************************************************************
* realloc (MSVCRT.@)
*/
void* CDECL MSVCRT_realloc(void* ptr, MSVCRT_size_t size)
{
if (!ptr) return MSVCRT_malloc(size);
if (size) return HeapReAlloc(GetProcessHeap(), 0, ptr, size);
MSVCRT_free(ptr);
return NULL;
}
/*********************************************************************
* __p__amblksiz (MSVCRT.@)
*/
unsigned int* CDECL __p__amblksiz(void)
{
return &MSVCRT_amblksiz;
}
/*********************************************************************
* _get_sbh_threshold (MSVCRT.@)
*/
MSVCRT_size_t CDECL _get_sbh_threshold(void)
{
return MSVCRT_sbh_threshold;
}
/*********************************************************************
* _set_sbh_threshold (MSVCRT.@)
*/
int CDECL _set_sbh_threshold(MSVCRT_size_t threshold)
{
if(threshold > 1016)
return 0;
else
MSVCRT_sbh_threshold = threshold;
return 1;
}
/*********************************************************************
* _aligned_free (MSVCRT.@)
*/
void CDECL _aligned_free(void *memblock)
{
TRACE("(%p)\n", memblock);
if (memblock)
{
void **saved = SAVED_PTR(memblock);
MSVCRT_free(*saved);
}
}
/*********************************************************************
* _aligned_offset_malloc (MSVCRT.@)
*/
void * CDECL _aligned_offset_malloc(MSVCRT_size_t size, MSVCRT_size_t alignment, MSVCRT_size_t offset)
{
void *memblock, *temp, **saved;
TRACE("(%u, %u, %u)\n", size, alignment, offset);
/* alignment must be a power of 2 */
if ((alignment & (alignment - 1)) != 0)
{
msvcrt_set_errno(EINVAL);
return NULL;
}
/* offset must be less than size */
if (offset >= size)
{
msvcrt_set_errno(EINVAL);
return NULL;
}
/* don't align to less than void pointer size */
if (alignment < sizeof(void *))
alignment = sizeof(void *);
/* allocate enough space for void pointer and alignment */
temp = MSVCRT_malloc(size + alignment + sizeof(void *));
if (!temp)
return NULL;
/* adjust pointer for proper alignment and offset */
memblock = ALIGN_PTR(temp, alignment, offset);
/* Save the real allocation address below returned address */
/* so it can be found later to free. */
saved = SAVED_PTR(memblock);
*saved = temp;
return memblock;
}
/*********************************************************************
* _aligned_malloc (MSVCRT.@)
*/
void * CDECL _aligned_malloc(MSVCRT_size_t size, MSVCRT_size_t alignment)
{
TRACE("(%u, %u)\n", size, alignment);
return _aligned_offset_malloc(size, alignment, 0);
}
/*********************************************************************
* _aligned_offset_realloc (MSVCRT.@)
*/
void * CDECL _aligned_offset_realloc(void *memblock, MSVCRT_size_t size,
MSVCRT_size_t alignment, MSVCRT_size_t offset)
{
void * temp, **saved;
MSVCRT_size_t old_padding, new_padding, old_size;
TRACE("(%p, %u, %u, %u)\n", memblock, size, alignment, offset);
if (!memblock)
return _aligned_offset_malloc(size, alignment, offset);
/* alignment must be a power of 2 */
if ((alignment & (alignment - 1)) != 0)
{
msvcrt_set_errno(EINVAL);
return NULL;
}
/* offset must be less than size */
if (offset >= size)
{
msvcrt_set_errno(EINVAL);
return NULL;
}
if (size == 0)
{
_aligned_free(memblock);
return NULL;
}
/* don't align to less than void pointer size */
if (alignment < sizeof(void *))
alignment = sizeof(void *);
/* make sure alignment and offset didn't change */
saved = SAVED_PTR(memblock);
if (memblock != ALIGN_PTR(*saved, alignment, offset))
{
msvcrt_set_errno(EINVAL);
return NULL;
}
old_padding = (char *)memblock - (char *)*saved;
/* Get previous size of block */
old_size = _msize(*saved);
if (old_size == -1)
{
/* It seems this function was called with an invalid pointer. Bail out. */
return NULL;
}
/* Adjust old_size to get amount of actual data in old block. */
old_size -= old_padding;
if (old_size < 0)
{
/* Shouldn't happen. Something's weird, so bail out. */
return NULL;
}
temp = MSVCRT_realloc(*saved, size + alignment + sizeof(void *));
if (!temp)
return NULL;
/* adjust pointer for proper alignment and offset */
memblock = ALIGN_PTR(temp, alignment, offset);
/* Save the real allocation address below returned address */
/* so it can be found later to free. */
saved = SAVED_PTR(memblock);
new_padding = (char *)memblock - (char *)temp;
/*
Memory layout of old block is as follows:
+-------+---------------------+-+--------------------------+-----------+
| ... | "old_padding" bytes | | ... "old_size" bytes ... | ... |
+-------+---------------------+-+--------------------------+-----------+
^ ^ ^
| | |
*saved saved memblock
Memory layout of new block is as follows:
+-------+-----------------------------+-+----------------------+-------+
| ... | "new_padding" bytes | | ... "size" bytes ... | ... |
+-------+-----------------------------+-+----------------------+-------+
^ ^ ^
| | |
temp saved memblock
However, in the new block, actual data is still written as follows
(because it was copied by MSVCRT_realloc):
+-------+---------------------+--------------------------------+-------+
| ... | "old_padding" bytes | ... "old_size" bytes ... | ... |
+-------+---------------------+--------------------------------+-------+
^ ^ ^
| | |
temp saved memblock
Therefore, min(old_size,size) bytes of actual data have to be moved
from the offset they were at in the old block (temp + old_padding),
to the offset they have to be in the new block (temp + new_padding == memblock).
*/
if (new_padding != old_padding)
memmove((char *)memblock, (char *)temp + old_padding, (old_size < size) ? old_size : size);
*saved = temp;
return memblock;
}
/*********************************************************************
* _aligned_realloc (MSVCRT.@)
*/
void * CDECL _aligned_realloc(void *memblock, MSVCRT_size_t size, MSVCRT_size_t alignment)
{
TRACE("(%p, %u, %u)\n", memblock, size, alignment);
return _aligned_offset_realloc(memblock, size, alignment, 0);
}
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