//
// 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;
}
//
// Z_FreeAlloca
//
// haleyjd 12/06/06: Frees all blocks allocated with Z_Alloca.
//
void Z_FreeAlloca(void)
{
memblock_t *block = blockbytag[PU_AUTO];
if(!block)
return;
Z_LogPuts("* Freeing alloca blocks\n");
blockbytag[PU_AUTO] = NULL;
while(block)
{
memblock_t *next = block->next;
Z_IDCheckNB(IDBOOL(block->id != ZONEID),
"Z_FreeAlloca: Freed a tag without ZONEID",
__FILE__, __LINE__);
Z_Free((byte *)block + header_size);
block = next; // Advance to next block
}
}
//
// 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();
}