static PyObject *soomfunc_valuepos(PyObject *module, PyObject *args)
{
ArrayInfo *array_info, info_ret;
PyArrayObject *ret;
int shape[1];
int alloc_size;
int type_num, num_arrays;
array_info = check_array_args(args, 2, 2, 0);
if (array_info == NULL)
return NULL;
type_num = array_info->array->descr->type_num;
num_arrays = PyTuple_Size(args);
alloc_size = array_info->len;
INSTRUMENT(("ssii", "valuepos", "enter", array_info[0].len, array_info[1].len));
/* Build the array to capture the result */
shape[0] = alloc_size;
ret = (PyArrayObject *)PyArray_FromDims(1, shape, PyArray_LONG);
if (ret == NULL) {
free_array_info(array_info, num_arrays);
return NULL;
}
set_array_info(&info_ret, ret);
/* Generate the valuepos.
*/
switch (type_num) {
case PyArray_CHAR:
case PyArray_SBYTE:
valuepos_schar(&array_info[0], &array_info[1], &info_ret);
break;
case PyArray_UBYTE:
valuepos_uchar(&array_info[0], &array_info[1], &info_ret);
break;
case PyArray_SHORT:
valuepos_short(&array_info[0], &array_info[1], &info_ret);
break;
case PyArray_INT:
valuepos_int(&array_info[0], &array_info[1], &info_ret);
break;
case PyArray_LONG:
valuepos_long(&array_info[0], &array_info[1], &info_ret);
break;
case PyArray_FLOAT:
valuepos_float(&array_info[0], &array_info[1], &info_ret);
break;
case PyArray_DOUBLE:
valuepos_double(&array_info[0], &array_info[1], &info_ret);
break;
}
free_array_info(array_info, num_arrays);
ret->dimensions[0] = info_ret.len;
INSTRUMENT(("ssi", "valuepos", "exit", info_ret.len));
return (PyObject *)ret;
}
//
// Z_Init
//
void (Z_Init)(__string file, int line)
{
register size_t size;
// Allocate the memory
// davidph 06/17/12: For DS, memory is a static allocation.
zonebase = (memblock_t __near *)heap;
zonebase_size = HEAPSIZE;
// Align on cache boundary
// davidph 08/03/12 FIXME: This causes invalid codegen.
//zone = (memblock_t *)(((uintptr_t)zonebase + (CACHE_ALIGN - 1)) & ~(CACHE_ALIGN - 1));
zone = zonebase;
size = zonebase_size - ((char __near *)zone - (char __near *)zonebase);
rover = zone; // Rover points to base of zone mem
zone->next = zone->prev = zone; // Single node
zone->size = size - HEADER_SIZE; // All memory in one block
zone->tag = PU_FREE; // A free block
#ifdef ZONEIDCHECK
zone->id = 0;
#endif
INSTRUMENT(free_memory = zone->size);
INSTRUMENT(inactive_memory = zonebase_size - zone->size);
INSTRUMENT(active_memory = purgable_memory = 0);
Z_OpenLogFile();
Z_LogPrintf("Initialized zone heap with size of %u bytes (zonebase = %p)\n",
zonebase_size, (void *)zonebase);
}
//
// Z_Malloc
//
// You can pass a NULL user if the tag is < PU_PURGELEVEL.
//
void *(Z_Malloc)(size_t size, int tag, void **user, const char *file, int line)
{
memblock_t *block;
byte *ret;
DEBUG_CHECKHEAP();
Z_IDCheckNB(IDBOOL(tag >= PU_PURGELEVEL && !user),
"Z_Malloc: an owner is required for purgable blocks",
file, line);
if(!size)
return user ? *user = NULL : NULL; // malloc(0) returns NULL
if(!(block = (memblock_t *)(malloc(size + header_size))))
{
if(blockbytag[PU_CACHE])
{
Z_FreeTags(PU_CACHE, PU_CACHE);
block = (memblock_t *)(malloc(size + header_size));
}
}
if(!block)
{
I_FatalError(I_ERR_KILL, "Z_Malloc: Failure trying to allocate %u bytes\n"
"Source: %s:%d\n", (unsigned int)size, file, line);
}
block->size = size;
if((block->next = blockbytag[tag]))
block->next->prev = &block->next;
blockbytag[tag] = block;
block->prev = &blockbytag[tag];
INSTRUMENT(memorybytag[tag] += block->size);
INSTRUMENT(block->file = file);
INSTRUMENT(block->line = line);
IDCHECK(block->id = ZONEID); // signature required in block header
block->tag = tag; // tag
block->user = user; // user
ret = ((byte *) block + header_size);
if(user) // if there is a user
*user = ret; // set user to point to new block
// scramble memory -- weed out any bugs
SCRAMBLER(ret, size);
Z_LogPrintf("* %p = Z_Malloc(size=%lu, tag=%d, user=%p, source=%s:%d)\n",
ret, size, tag, user, file, line);
return ret;
}
static PyObject *soomfunc_preload(PyObject *module, PyObject *args)
{
PyObject *obj;
PyArrayObject *array;
int preload = -1;
if (!PyArg_ParseTuple(args, "O|i", &obj, &preload))
return NULL;
array = (PyArrayObject *)PyArray_FromObject(obj, PyArray_NOTYPE, 0, 0);
if (array == NULL)
return NULL;
if (array->nd != 1) {
PyErr_SetString(PyExc_ValueError, "arrays must be rank-1");
Py_DECREF(array);
return NULL;
}
if (preload < 0 || preload > array->dimensions[0])
preload = array->dimensions[0] - 1;
INSTRUMENT(("ssi", "preload", "enter", preload));
switch (array->descr->type_num) {
case PyArray_CHAR:
case PyArray_SBYTE:
preload_schar(array, preload);
break;
case PyArray_UBYTE:
preload_uchar(array, preload);
break;
case PyArray_SHORT:
preload_short(array, preload);
break;
case PyArray_INT:
preload_int(array, preload);
break;
case PyArray_LONG:
preload_long(array, preload);
break;
case PyArray_FLOAT:
preload_float(array, preload);
break;
case PyArray_DOUBLE:
preload_double(array, preload);
break;
}
Py_DECREF(array);
Py_INCREF(Py_None);
INSTRUMENT(("ss", "preload", "exit"));
return Py_None;
}
static PyObject *soomfunc_union(PyObject *module, PyObject *args)
{
ArrayInfo *array_info;
PyArrayObject *ret;
int type_num, num_arrays;
array_info = check_array_args(args, 2, -1, 0);
if (array_info == NULL)
return NULL;
type_num = array_info->array->descr->type_num;
num_arrays = PyTuple_Size(args);
INSTRUMENT(("ssi", "union", "enter", num_arrays));
/* Accumulate the difference cumulatively by comparing the first
* two arrays then comparing the result with the third and so on.
*/
ret = NULL;
switch (type_num) {
case PyArray_CHAR:
case PyArray_SBYTE:
ret = (PyArrayObject *)dense_union_schar(array_info, num_arrays);
break;
case PyArray_UBYTE:
ret = (PyArrayObject *)dense_union_uchar(array_info, num_arrays);
break;
case PyArray_SHORT:
ret = (PyArrayObject *)dense_union_short(array_info, num_arrays);
break;
case PyArray_INT:
ret = (PyArrayObject *)dense_union_int(array_info, num_arrays);
break;
case PyArray_LONG:
ret = (PyArrayObject *)dense_union_long(array_info, num_arrays);
break;
case PyArray_FLOAT:
ret = (PyArrayObject *)sparse_union_float(array_info, num_arrays);
break;
case PyArray_DOUBLE:
ret = (PyArrayObject *)sparse_union_double(array_info, num_arrays);
break;
default:
PyErr_SetString(PyExc_ValueError, "bogus - unhandled array type");
}
free_array_info(array_info, num_arrays);
INSTRUMENT(("ssi", "union", "exit", ret->dimensions[0]));
return (PyObject *)ret;
}
//
// Z_ChangeTag
//
void (Z_ChangeTag)(void *ptr, int tag, const char *file, int line)
{
memblock_t *block;
DEBUG_CHECKHEAP();
if(!ptr)
{
I_FatalError(I_ERR_KILL,
"Z_ChangeTag: can't change a NULL pointer at %s:%d\n",
file, line);
}
block = (memblock_t *)((byte *) ptr - header_size);
Z_IDCheck(IDBOOL(block->id != ZONEID),
"Z_ChangeTag: Changed a tag without ZONEID", block, file, line);
// haleyjd: permanent blocks are not re-tagged even if the code tries.
if(block->tag == PU_PERMANENT)
return;
Z_IDCheck(IDBOOL(tag >= PU_PURGELEVEL && !block->user),
"Z_ChangeTag: an owner is required for purgable blocks",
block, file, line);
if((*block->prev = block->next))
block->next->prev = block->prev;
if((block->next = blockbytag[tag]))
block->next->prev = &block->next;
block->prev = &blockbytag[tag];
blockbytag[tag] = block;
INSTRUMENT(memorybytag[block->tag] -= block->size);
INSTRUMENT(memorybytag[tag] += block->size);
block->tag = tag;
Z_LogPrintf("* Z_ChangeTag(p=%p, tag=%d, file=%s:%d)\n",
ptr, tag, file, line);
}
//
// Z_Free
//
void (Z_Free)(void *p, const char *file, int line)
{
DEBUG_CHECKHEAP();
if(p)
{
memblock_t *block = (memblock_t *)((byte *) p - header_size);
Z_IDCheck(IDBOOL(block->id != ZONEID),
"Z_Free: freed a pointer without ZONEID", block, file, line);
// haleyjd: permanent blocks are never freed even if the code tries.
if(block->tag == PU_PERMANENT)
return;
IDCHECK(block->id = 0); // Nullify id so another free fails
// haleyjd 01/20/09: check invalid tags
// catches double frees and possible selective heap corruption
if(block->tag == PU_FREE || block->tag >= PU_MAX)
{
I_FatalError(I_ERR_KILL,
"Z_Free: freed a pointer with invalid tag %d\n"
"Source: %s:%d\n"
#if defined(ZONEVERBOSE) && defined(INSTRUMENTED)
"Source of malloc: %s:%d\n"
, block->tag, file, line, block->file, block->line
#else
, block->tag, file, line
#endif
);
}
INSTRUMENT(memorybytag[block->tag] -= block->size);
block->tag = PU_FREE; // Mark block freed
// scramble memory -- weed out any bugs
SCRAMBLER(p, block->size);
if(block->user) // Nullify user if one exists
*block->user = NULL;
if((*block->prev = block->next))
block->next->prev = block->prev;
free(block);
Z_LogPrintf("* Z_Free(p=%p, file=%s:%d)\n", p, file, line);
}
}
//
// Z_Realloc
//
// For the native heap, this can easily behave as a real realloc, and not
// just an ignorant copy-and-free.
//
void *(Z_Realloc)(void *ptr, size_t n, int tag, void **user,
const char *file, int line)
{
void *p;
memblock_t *block, *newblock, *origblock;
// if not allocated at all, defer to Z_Malloc
if(!ptr)
return (Z_Malloc)(n, tag, user, file, line);
// size == 0 is a special case that cannot be handled below
if(n == 0)
{
(Z_Free)(ptr, file, line);
return NULL;
}
DEBUG_CHECKHEAP();
block = origblock = (memblock_t *)((byte *)ptr - header_size);
Z_IDCheck(IDBOOL(block->id != ZONEID),
"Z_Realloc: Reallocated a block without ZONEID\n",
block, file, line);
// haleyjd: realloc cannot change the tag of a permanent block
if(block->tag == PU_PERMANENT)
tag = PU_PERMANENT;
// nullify current user, if any
if(block->user)
*(block->user) = NULL;
// detach from list before reallocation
if((*block->prev = block->next))
block->next->prev = block->prev;
block->next = NULL;
block->prev = NULL;
INSTRUMENT(memorybytag[block->tag] -= block->size);
if(!(newblock = (memblock_t *)(realloc(block, n + header_size))))
{
// haleyjd 07/09/10: Note that unlinking the block above makes this safe
// even if the current block is PU_CACHE; Z_FreeTags won't find it.
if(blockbytag[PU_CACHE])
{
Z_FreeTags(PU_CACHE, PU_CACHE);
newblock = (memblock_t *)(realloc(block, n + header_size));
}
}
if(!(block = newblock))
{
if(origblock->size >= n)
{
block = origblock; // restore original block if size was equal or smaller
n = block->size; // keep same size in this event
}
else
{
I_FatalError(I_ERR_KILL, "Z_Realloc: Failure trying to allocate %u bytes\n"
"Source: %s:%d\n", (unsigned int)n, file, line);
}
}
block->size = n;
block->tag = tag;
p = (byte *)block + header_size;
// set new user, if any
block->user = user;
if(user)
*user = p;
// reattach to list at possibly new address, new tag
if((block->next = blockbytag[tag]))
block->next->prev = &block->next;
blockbytag[tag] = block;
block->prev = &blockbytag[tag];
INSTRUMENT(memorybytag[tag] += block->size);
INSTRUMENT(block->file = file);
INSTRUMENT(block->line = line);
Z_LogPrintf("* %p = Z_Realloc(ptr=%p, n=%lu, tag=%d, user=%p, source=%s:%d)\n",
p, ptr, n, tag, user, file, line);
return p;
}
static PyObject *soomfunc_unique(PyObject *module, PyObject *args)
{
ArrayInfo *array_info, *info, info_ret;
int type_num, num_arrays;
PyArrayObject *ret;
array_info = check_array_args(args, 1, 2, 0);
if (array_info == NULL)
return NULL;
type_num = array_info->array->descr->type_num;
num_arrays = PyTuple_Size(args);
INSTRUMENT(("ssi", "unique", "enter", array_info[0].len));
if (num_arrays != 2) {
int shape[1];
/* Build the array to capture the unique values.
*/
shape[0] = array_info->len;
ret = (PyArrayObject *)PyArray_FromDims(1, shape, type_num);
if (ret == NULL) {
free_array_info(array_info, num_arrays);
return NULL;
}
set_array_info(&info_ret, ret);
info = &info_ret;
} else {
info = &array_info[1];
ret = info->array;
}
/* Generate the unique array.
*/
switch (type_num) {
case PyArray_CHAR:
case PyArray_SBYTE:
unique_schar(array_info, info);
break;
case PyArray_UBYTE:
unique_uchar(array_info, info);
break;
case PyArray_SHORT:
unique_short(array_info, info);
break;
case PyArray_INT:
unique_int(array_info, info);
break;
case PyArray_LONG:
unique_long(array_info, info);
break;
case PyArray_FLOAT:
unique_float(array_info, info);
break;
case PyArray_DOUBLE:
unique_double(array_info, info);
break;
}
ret->dimensions[0] = info->len;
free_array_info(array_info, num_arrays);
INSTRUMENT(("ssi", "unique", "exit", ret->dimensions[0]));
return (PyObject *)ret;
}
//
// Z_Realloc
//
// haleyjd 09/18/06: Rewritten to be an actual realloc routine. The
// various cases are as follows:
//
// 1. If the block is NULL, is in virtual memory, or we're trying to set it to
// zero-byte size, we use Z_ReallocOld above.
// 2. If the block is smaller than the new size, we need to expand it. If the
// next block on the zone heap is free, check to see if it together with the
// current block is large enough. If so, merge the blocks. Now test to make
// sure the internal fragmentation does not exceed the split limit. If it
// does, resplit the blocks at the new boundary. If the next block wasn't
// free, we have to call Z_ReallocOld to move the entire block elsewhere.
// 3. If the block is larger than the new size, we can shrink it, but we only
// need to shrink it if the wasted space is larger than the split limit.
// If so, the block is split at its new boundary. If the next block on the
// zone heap is free, it is then necessary to merge the new free block with
// the next block on the heap. In the event the block is not shrunk, only the
// INSTRUMENTED data needs to be updated to reflect the new internal fragmen-
// tation.
// 4. If the block is already the same size as "n", we don't need to do anything
// aside from adjusting the INSTRUMENTED block data for debugging purposes.
//
void *(Z_Realloc)(void *ptr, size_t n, int tag, void **user, __string file, int line)
{
register memblock_t __near *block, *other;
register size_t curr_size = 0;
// davidph 12/09/12: Handle null and size 0 right here instead of in Z_ReallocOld.
if(n == 0) { (Z_Free)(ptr, file, line); return NULL; }
if(!ptr)
return (Z_Malloc)(n, tag, user, file, line);
// get current size of block
block = VoidToBlock(ptr);
Z_IDCheck(IDBOOL(block->id != ZONEID),
"Z_Realloc: Reallocated a block without ZONEID\n",
block, file, line);
other = block->next; // save pointer to next block
curr_size = block->size;
// round new size to CHUNK_SIZE
n = (n + CHUNK_SIZE - 1) & ~(CHUNK_SIZE - 1);
if(n > curr_size) // is new allocation size larger than current?
{
register size_t extra;
// haleyjd 10/03/06: free adjacent purgable blocks
while(other != zone && other != block &&
(other->tag == PU_FREE || other->tag >= PU_PURGELEVEL))
{
if(other->tag >= PU_PURGELEVEL)
{
(Z_Free)(BlockToVoid(other), file, line);
// reset pointer to next block
other = block->next;
}
// use current size of block; note it may have increased if it was
// merged with an adjacent free block
// if we've freed enough, stop
if(curr_size + other->size + HEADER_SIZE >= n)
break;
// move to next block
other = other->next;
}
// reset pointer
other = block->next;
// check to see if it can fit if we merge with the next block
if(other != zone && other->tag == PU_FREE &&
curr_size + other->size + HEADER_SIZE >= n)
{
// merge the blocks
if(rover == other)
rover = block;
(block->next = other->next)->prev = block;
block->size += other->size + HEADER_SIZE;
#ifdef INSTRUMENTED
// lost a block...
inactive_memory -= HEADER_SIZE;
// lost a free block...
free_memory -= other->size;
// increased active or purgable
if(block->tag >= PU_PURGELEVEL)
purgable_memory += other->size + HEADER_SIZE;
else
active_memory += other->size + HEADER_SIZE;
#endif
// check to see if there's enough extra to warrant splitting off
// a new free block
extra = block->size - n;
if(extra >= MIN_BLOCK_SPLIT + HEADER_SIZE)
{
register memblock_t __near *newb =
(memblock_t __near *)((char __near *)block + HEADER_SIZE + n);
(newb->next = block->next)->prev = newb;
(newb->prev = block)->next = newb;
block->size = n;
newb->size = extra - HEADER_SIZE;
newb->tag = PU_FREE;
if(rover == block)
rover = newb;
#ifdef INSTRUMENTED
// added a block...
inactive_memory += HEADER_SIZE;
// added a free block...
free_memory += newb->size;
// decreased active or purgable
if(block->tag >= PU_PURGELEVEL)
purgable_memory -= newb->size + HEADER_SIZE;
else
active_memory -= newb->size + HEADER_SIZE;
#endif
}
// subtract old internal fragmentation and add new
INSTRUMENT(inactive_memory -= block->extra);
INSTRUMENT(inactive_memory += (block->extra = block->size - n));
}
else // else, do old realloc (make new, copy old, free old)
{
// davidph 12/10/12: This was the only place Z_ReallocOld was called.
// And we know that ptr != NULL and n != 0 and n > curr_size.
register void *p = (Z_Malloc)(n, tag, user, file, line);
memcpy_near((void __near *)p, (void __near *)ptr, curr_size);
(Z_Free)(ptr, file, line);
if(user) // in case Z_Free nullified same user
*user = p;
return p;
}
}
else if(n < curr_size) // is new allocation size smaller than current?
{
// check to see if there's enough extra to warrant splitting off
// a new free block
size_t extra = curr_size - n;
if(extra >= MIN_BLOCK_SPLIT + HEADER_SIZE)
{
register memblock_t __near *newb =
(memblock_t __near *)((char __near *)block + HEADER_SIZE + n);
(newb->next = block->next)->prev = newb;
(newb->prev = block)->next = newb;
block->size = n;
newb->size = extra - HEADER_SIZE;
newb->tag = PU_FREE;
#ifdef INSTRUMENTED
// added a block...
inactive_memory += HEADER_SIZE;
// added a free block...
free_memory += newb->size;
// decreased purgable or active
if(block->tag >= PU_PURGELEVEL)
purgable_memory -= newb->size + HEADER_SIZE;
else
active_memory -= newb->size + HEADER_SIZE;
#endif
// may need to merge new block with next block
if(other && other->tag == PU_FREE && other != zone)
{
if(rover == other) // Move back rover if it points at next block
rover = newb;
(newb->next = other->next)->prev = newb;
newb->size += other->size + HEADER_SIZE;
// deleted a block...
INSTRUMENT(inactive_memory -= HEADER_SIZE);
// space between blocks is now free
INSTRUMENT(free_memory += HEADER_SIZE);
}
}
// else, leave block the same size
// subtract old internal fragmentation and add new
INSTRUMENT(inactive_memory -= block->extra);
INSTRUMENT(inactive_memory += (block->extra = block->size - n));
}
// else new allocation size is same as current, don't change it
// modify the block
INSTRUMENT(block->file = file);
INSTRUMENT(block->line = line);
// reset ptr for consistency
ptr = BlockToVoid(block);
if(block->user != user)
{
if(block->user) // nullify old user if any
*(block->user) = NULL;
block->user = user; // set block's new user
if(user) // if non-null, set user to allocation
*user = ptr;
}
// let Z_ChangeTag handle changing the tag
if(block->tag != tag)
(Z_ChangeTag)(ptr, tag, file, line);
Z_PrintStats(); // print memory allocation stats
Z_LogPrintf("* Z_Realloc(ptr=%p, n=%u, tag=%d, user=%p, source=%s:%d)\n",
ptr, n, tag, user, file, line);
return ptr;
}
//
// Z_Free
//
void (Z_Free)(void *p, __string file, int line)
{
register memblock_t __near *other, *block;
if(!p) return;
DEBUG_CHECKHEAP();
block = VoidToBlock(p);
Z_IDCheck(IDBOOL(block->id != ZONEID),
"Z_Free: freed a pointer without ZONEID", block, file, line);
IDCHECK(block->id = 0); // Nullify id so another free fails
// haleyjd 01/20/09: check invalid tags
// catches double frees and possible selective heap corruption
if(block->tag == PU_FREE || block->tag >= PU_MAX)
{
zonef("Z_Free: freed a pointer with invalid tag %d\nSource: %s:%d\n"
#ifdef INSTRUMENTED
"Source of malloc: %s:%d\n"
, block->tag, file, line, block->file, block->line
#else
, block->tag, file, line
#endif
);
abort();
}
SCRAMBLER(p, block->size);
if(block->user) // Nullify user if one exists
*block->user = NULL;
#ifdef INSTRUMENTED
free_memory += block->size;
inactive_memory -= block->extra;
if(block->tag >= PU_PURGELEVEL)
purgable_memory -= block->size - block->extra;
else
active_memory -= block->size - block->extra;
#endif
block->tag = PU_FREE; // Mark block freed
if(block != zone)
{
other = block->prev; // Possibly merge with previous block
if(other->tag == PU_FREE)
{
if(rover == block) // Move back rover if it points at block
rover = other;
(other->next = block->next)->prev = other;
other->size += block->size + HEADER_SIZE;
block = other;
INSTRUMENT(inactive_memory -= HEADER_SIZE);
INSTRUMENT(free_memory += HEADER_SIZE);
}
}
other = block->next; // Possibly merge with next block
if(other->tag == PU_FREE && other != zone)
{
if(rover == other) // Move back rover if it points at next block
rover = block;
(block->next = other->next)->prev = block;
block->size += other->size + HEADER_SIZE;
INSTRUMENT(inactive_memory -= HEADER_SIZE);
INSTRUMENT(free_memory += HEADER_SIZE);
}
Z_PrintStats(); // print memory allocation stats
Z_LogPrintf("* Z_Free(p=%p, file=%s:%d)\n", p, file, line);
}
//
// Z_Malloc
//
// You can pass a NULL user if the tag is < PU_PURGELEVEL.
//
void *(Z_Malloc)(size_t size, int tag, void **user, __string file, int line)
{
register memblock_t __near *block, *start;
INSTRUMENT(register size_t size_orig = size);
// davidph 12/10/12: If zone not initialized, do so now.
if(!zone) (Z_Init)(file, line);
DEBUG_CHECKHEAP();
Z_IDCheckNB(IDBOOL(tag >= PU_PURGELEVEL && !user),
"Z_Malloc: an owner is required for purgable blocks",
file, line);
if(!size)
return user ? *user = NULL : NULL; // malloc(0) returns NULL
size = (size+CHUNK_SIZE-1) & ~(CHUNK_SIZE-1); // round to chunk size
block = rover;
if(block->prev->tag == PU_FREE)
block = block->prev;
start = block;
// haleyjd 01/01/01 (happy new year!):
// the first if() inside the loop below contains cph's memory
// purging efficiency fix
do
{
// Free purgable blocks; replacement is roughly FIFO
if(block->tag >= PU_PURGELEVEL)
{
start = block->prev;
Z_Free((char __near *)block + HEADER_SIZE);
// cph - If start->next == block, we did not merge with the previous
// If !=, we did, so we continue from start.
// Important: we've reset start!
if(start->next == block)
start = start->next;
else
block = start;
}
if(block->tag == PU_FREE && block->size >= size) // First-fit
{
size_t extra = block->size - size;
if(extra >= MIN_BLOCK_SPLIT + HEADER_SIZE)
{
memblock_t __near *newb = (memblock_t __near *)((char __near *)block + HEADER_SIZE + size);
(newb->next = block->next)->prev = newb;
(newb->prev = block)->next = newb; // Split up block
block->size = size;
newb->size = extra - HEADER_SIZE;
newb->tag = PU_FREE;
INSTRUMENT(inactive_memory += HEADER_SIZE);
INSTRUMENT(free_memory -= HEADER_SIZE);
}
rover = block->next; // set roving pointer for next search
#ifdef INSTRUMENTED
inactive_memory += block->extra = block->size - size_orig;
if(tag >= PU_PURGELEVEL)
purgable_memory += size_orig;
else
active_memory += size_orig;
free_memory -= block->size;
#endif
INSTRUMENT(block->file = file);
INSTRUMENT(block->line = line);
IDCHECK(block->id = ZONEID);// signature required in block header
block->tag = tag; // tag
block->user = user; // user
block = BlockToVoid(block);
if(user) // if there is a user
*user = block; // set user to point to new block
Z_PrintStats(); // print memory allocation stats
// scramble memory -- weed out any bugs
SCRAMBLER(block, size);
Z_LogPrintf("* %p = Z_Malloc(size=%u, tag=%d, user=%p, source=%s:%d)\n",
block, size, tag, user, file, line);
return block;
}
}
while((block = block->next) != start); // detect cycles as failure
zonef("Z_Malloc: Failure trying to allocate %u bytes\nSource: %s:%d\n", size, file, line);
abort();
}