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wine/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 "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))
#define SB_HEAP_ALIGN 16
static HANDLE heap, sb_heap;
typedef int (CDECL *MSVCRT_new_handler_func)(MSVCRT_size_t 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;
static void* msvcrt_heap_alloc(DWORD flags, MSVCRT_size_t size)
{
if(size < MSVCRT_sbh_threshold)
{
void *memblock, *temp, **saved;
temp = HeapAlloc(sb_heap, flags, size+sizeof(void*)+SB_HEAP_ALIGN);
if(!temp) return NULL;
memblock = ALIGN_PTR(temp, SB_HEAP_ALIGN, 0);
saved = SAVED_PTR(memblock);
*saved = temp;
return memblock;
}
return HeapAlloc(heap, flags, size);
}
static void* msvcrt_heap_realloc(DWORD flags, void *ptr, MSVCRT_size_t size)
{
if(sb_heap && ptr && !HeapValidate(heap, 0, ptr))
{
/* TODO: move data to normal heap if it exceeds sbh_threshold limit */
void *memblock, *temp, **saved;
MSVCRT_size_t old_padding, new_padding, old_size;
saved = SAVED_PTR(ptr);
old_padding = (char*)ptr - (char*)*saved;
old_size = HeapSize(sb_heap, 0, *saved);
if(old_size == -1)
return NULL;
old_size -= old_padding;
temp = HeapReAlloc(sb_heap, flags, *saved, size+sizeof(void*)+SB_HEAP_ALIGN);
if(!temp) return NULL;
memblock = ALIGN_PTR(temp, SB_HEAP_ALIGN, 0);
saved = SAVED_PTR(memblock);
new_padding = (char*)memblock - (char*)temp;
if(new_padding != old_padding)
memmove(memblock, (char*)temp+old_padding, old_size>size ? size : old_size);
*saved = temp;
return memblock;
}
return HeapReAlloc(heap, flags, ptr, size);
}
static BOOL msvcrt_heap_free(void *ptr)
{
if(sb_heap && ptr && !HeapValidate(heap, 0, ptr))
{
void **saved = SAVED_PTR(ptr);
return HeapFree(sb_heap, 0, *saved);
}
return HeapFree(heap, 0, ptr);
}
static MSVCRT_size_t msvcrt_heap_size(void *ptr)
{
if(sb_heap && ptr && !HeapValidate(heap, 0, ptr))
{
void **saved = SAVED_PTR(ptr);
return HeapSize(sb_heap, 0, *saved);
}
return HeapSize(heap, 0, ptr);
}
/*********************************************************************
* ??2@YAPAXI@Z (MSVCRT.@)
*/
void* CDECL MSVCRT_operator_new(MSVCRT_size_t size)
{
void *retval;
int freed;
do
{
retval = msvcrt_heap_alloc(0, size);
if(retval)
{
TRACE("(%ld) returning %p\n", size, retval);
return retval;
}
LOCK_HEAP;
if(MSVCRT_new_handler)
freed = (*MSVCRT_new_handler)(size);
else
freed = 0;
UNLOCK_HEAP;
} while(freed);
TRACE("(%ld) out of memory\n", size);
return NULL;
}
/*********************************************************************
* ??2@YAPAXIHPBDH@Z (MSVCRT.@)
*/
void* CDECL MSVCRT_operator_new_dbg(MSVCRT_size_t size, int type, const char *file, int line)
{
return MSVCRT_operator_new( size );
}
/*********************************************************************
* ??3@YAXPAX@Z (MSVCRT.@)
*/
void CDECL MSVCRT_operator_delete(void *mem)
{
TRACE("(%p)\n", mem);
msvcrt_heap_free(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(MSVCRT_size_t size)
{
if(MSVCRT_new_handler)
(*MSVCRT_new_handler)(size);
return 0;
}
/*********************************************************************
* _expand (MSVCRT.@)
*/
void* CDECL _expand(void* mem, MSVCRT_size_t size)
{
return msvcrt_heap_realloc(HEAP_REALLOC_IN_PLACE_ONLY, mem, size);
}
/*********************************************************************
* _heapchk (MSVCRT.@)
*/
int CDECL _heapchk(void)
{
if (!HeapValidate(heap, 0, NULL) ||
(sb_heap && !HeapValidate(sb_heap, 0, NULL)))
{
msvcrt_set_errno(GetLastError());
return MSVCRT__HEAPBADNODE;
}
return MSVCRT__HEAPOK;
}
/*********************************************************************
* _heapmin (MSVCRT.@)
*/
int CDECL _heapmin(void)
{
if (!HeapCompact( heap, 0 ) ||
(sb_heap && !HeapCompact( sb_heap, 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;
if (sb_heap)
FIXME("small blocks heap not supported\n");
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( heap, 0, phe.lpData ))
{
UNLOCK_HEAP;
msvcrt_set_errno(GetLastError());
return MSVCRT__HEAPBADNODE;
}
do
{
if (!HeapWalk( heap, &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,%ld) unsupported in Win32\n", mem,size);
*MSVCRT__errno() = MSVCRT_ENOSYS;
return -1;
}
/*********************************************************************
* _get_heap_handle (MSVCRT.@)
*/
MSVCRT_intptr_t CDECL _get_heap_handle(void)
{
return (MSVCRT_intptr_t)heap;
}
/*********************************************************************
* _msize (MSVCRT.@)
*/
MSVCRT_size_t CDECL _msize(void* mem)
{
MSVCRT_size_t size = msvcrt_heap_size(mem);
if (size == ~(MSVCRT_size_t)0)
{
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;
}
/*********************************************************************
* _aligned_msize (MSVCR100.@)
*/
size_t CDECL _aligned_msize(void *p, MSVCRT_size_t alignment, MSVCRT_size_t offset)
{
void **alloc_ptr;
if(!MSVCRT_CHECK_PMT(p)) return -1;
if(alignment < sizeof(void*))
alignment = sizeof(void*);
alloc_ptr = SAVED_PTR(p);
return _msize(*alloc_ptr)-alignment-sizeof(void*);
}
/*********************************************************************
* calloc (MSVCRT.@)
*/
void* CDECL MSVCRT_calloc(MSVCRT_size_t size, MSVCRT_size_t count)
{
return msvcrt_heap_alloc(HEAP_ZERO_MEMORY, size*count);
}
/*********************************************************************
* free (MSVCRT.@)
*/
void CDECL MSVCRT_free(void* ptr)
{
msvcrt_heap_free(ptr);
}
/*********************************************************************
* malloc (MSVCRT.@)
*/
void* CDECL MSVCRT_malloc(MSVCRT_size_t size)
{
void *ret = msvcrt_heap_alloc(0, size);
if (!ret)
*MSVCRT__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 msvcrt_heap_realloc(0, ptr, size);
MSVCRT_free(ptr);
return NULL;
}
/*********************************************************************
* _recalloc (MSVCR100.@)
*/
void* CDECL _recalloc(void *mem, MSVCRT_size_t num, MSVCRT_size_t size)
{
MSVCRT_size_t old_size;
void *ret;
if(!mem)
return MSVCRT_calloc(num, size);
size = num*size;
old_size = _msize(mem);
ret = MSVCRT_realloc(mem, size);
if(!ret) {
*MSVCRT__errno() = MSVCRT_ENOMEM;
return NULL;
}
if(size>old_size)
memset((BYTE*)ret+old_size, 0, size-old_size);
return ret;
}
/*********************************************************************
* __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)
{
#ifdef _WIN64
return 0;
#else
if(threshold > 1016)
return 0;
if(!sb_heap)
{
sb_heap = HeapCreate(0, 0, 0);
if(!sb_heap)
return 0;
}
MSVCRT_sbh_threshold = (threshold+0xf) & ~0xf;
return 1;
#endif
}
/*********************************************************************
* _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("(%lu, %lu, %lu)\n", size, alignment, offset);
/* alignment must be a power of 2 */
if ((alignment & (alignment - 1)) != 0)
{
*MSVCRT__errno() = MSVCRT_EINVAL;
return NULL;
}
/* offset must be less than size */
if (offset && offset >= size)
{
*MSVCRT__errno() = MSVCRT_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("(%lu, %lu)\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, %lu, %lu, %lu)\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__errno() = MSVCRT_EINVAL;
return NULL;
}
/* offset must be less than size */
if (offset >= size)
{
*MSVCRT__errno() = MSVCRT_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__errno() = MSVCRT_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. */
if (old_size < old_padding)
{
/* Shouldn't happen. Something's weird, so bail out. */
return NULL;
}
old_size -= old_padding;
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, %lu, %lu)\n", memblock, size, alignment);
return _aligned_offset_realloc(memblock, size, alignment, 0);
}
/*********************************************************************
* memmove_s (MSVCRT.@)
*/
int CDECL MSVCRT_memmove_s(void *dest, MSVCRT_size_t numberOfElements, const void *src, MSVCRT_size_t count)
{
TRACE("(%p %lu %p %lu)\n", dest, numberOfElements, src, count);
if(!count)
return 0;
if (!MSVCRT_CHECK_PMT(dest != NULL)) return MSVCRT_EINVAL;
if (!MSVCRT_CHECK_PMT(src != NULL)) return MSVCRT_EINVAL;
if (!MSVCRT_CHECK_PMT_ERR( count <= numberOfElements, MSVCRT_ERANGE )) return MSVCRT_ERANGE;
memmove(dest, src, count);
return 0;
}
/*********************************************************************
* wmemmove_s (MSVCR100.@)
*/
int CDECL wmemmove_s(MSVCRT_wchar_t *dest, MSVCRT_size_t numberOfElements,
const MSVCRT_wchar_t *src, MSVCRT_size_t count)
{
TRACE("(%p %lu %p %lu)\n", dest, numberOfElements, src, count);
if (!count)
return 0;
/* Native does not seem to conform to 6.7.1.2.3 in
* http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1225.pdf
* in that it does not zero the output buffer on constraint violation.
*/
if (!MSVCRT_CHECK_PMT(dest != NULL)) return MSVCRT_EINVAL;
if (!MSVCRT_CHECK_PMT(src != NULL)) return MSVCRT_EINVAL;
if (!MSVCRT_CHECK_PMT_ERR(count <= numberOfElements, MSVCRT_ERANGE)) return MSVCRT_ERANGE;
memmove(dest, src, sizeof(MSVCRT_wchar_t)*count);
return 0;
}
/*********************************************************************
* memcpy_s (MSVCRT.@)
*/
int CDECL MSVCRT_memcpy_s(void *dest, MSVCRT_size_t numberOfElements, const void *src, MSVCRT_size_t count)
{
TRACE("(%p %lu %p %lu)\n", dest, numberOfElements, src, count);
if(!count)
return 0;
if (!MSVCRT_CHECK_PMT(dest != NULL)) return MSVCRT_EINVAL;
if (!MSVCRT_CHECK_PMT(src != NULL))
{
memset(dest, 0, numberOfElements);
return MSVCRT_EINVAL;
}
if (!MSVCRT_CHECK_PMT_ERR( count <= numberOfElements, MSVCRT_ERANGE ))
{
memset(dest, 0, numberOfElements);
return MSVCRT_ERANGE;
}
memcpy(dest, src, count);
return 0;
}
/*********************************************************************
* wmemcpy_s (MSVCR100.@)
*/
int CDECL wmemcpy_s(MSVCRT_wchar_t *dest, MSVCRT_size_t numberOfElements,
const MSVCRT_wchar_t *src, MSVCRT_size_t count)
{
TRACE("(%p %lu %p %lu)\n", dest, numberOfElements, src, count);
if (!count)
return 0;
if (!MSVCRT_CHECK_PMT(dest != NULL)) return MSVCRT_EINVAL;
if (!MSVCRT_CHECK_PMT(src != NULL)) {
memset(dest, 0, numberOfElements*sizeof(MSVCRT_wchar_t));
return MSVCRT_EINVAL;
}
if (!MSVCRT_CHECK_PMT_ERR(count <= numberOfElements, MSVCRT_ERANGE)) {
memset(dest, 0, numberOfElements*sizeof(MSVCRT_wchar_t));
return MSVCRT_ERANGE;
}
memcpy(dest, src, sizeof(MSVCRT_wchar_t)*count);
return 0;
}
/*********************************************************************
* strncpy_s (MSVCRT.@)
*/
int CDECL MSVCRT_strncpy_s(char *dest, MSVCRT_size_t numberOfElements,
const char *src, MSVCRT_size_t count)
{
MSVCRT_size_t i, end;
TRACE("(%p %lu %s %lu)\n", dest, numberOfElements, debugstr_a(src), count);
if(!count) {
if(dest && numberOfElements)
*dest = 0;
return 0;
}
if (!MSVCRT_CHECK_PMT(dest != NULL)) return MSVCRT_EINVAL;
if (!MSVCRT_CHECK_PMT(src != NULL)) return MSVCRT_EINVAL;
if (!MSVCRT_CHECK_PMT(numberOfElements != 0)) return MSVCRT_EINVAL;
if(count!=MSVCRT__TRUNCATE && count<numberOfElements)
end = count;
else
end = numberOfElements-1;
for(i=0; i<end && src[i]; i++)
dest[i] = src[i];
if(!src[i] || end==count || count==MSVCRT__TRUNCATE) {
dest[i] = '\0';
return 0;
}
MSVCRT_INVALID_PMT("dest[numberOfElements] is too small", MSVCRT_EINVAL);
dest[0] = '\0';
return MSVCRT_EINVAL;
}
BOOL msvcrt_init_heap(void)
{
heap = HeapCreate(0, 0, 0);
return heap != NULL;
}
void msvcrt_destroy_heap(void)
{
HeapDestroy(heap);
if(sb_heap)
HeapDestroy(sb_heap);
}
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