Xash3D FWGS engine.
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/*
zone.c - zone memory allocation from DarkPlaces
Copyright (C) 1996-1997 Id Software, Inc.
Copyright (C) 2000-2007 DarkPlaces contributors
Copyright (C) 2007 Uncle Mike
Copyright (C) 2015-2023 Xash3D FWGS contributors
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
*/
#include "common.h"
#define MEMHEADER_SENTINEL1 0xDEADF00DU
#define MEMHEADER_SENTINEL2 0xDFU
#ifdef XASH_CUSTOM_SWAP
#include "platform/swap/swap.h"
#define Q_malloc SWAP_Malloc
#define Q_free SWAP_Free
#else
#define Q_malloc malloc
#define Q_free free
#endif
typedef struct memheader_s
{
struct memheader_s *next; // next and previous memheaders in chain belonging to pool
struct memheader_s *prev;
struct mempool_s *pool; // pool this memheader belongs to
size_t size; // size of the memory after the header (excluding header and sentinel2)
const char *filename; // file name and line where Mem_Alloc was called
int fileline;
#if !XASH_64BIT
uint32_t pad0; // doesn't have value, only to make Mem_Alloc return aligned addresses on ILP32
#endif
uint32_t sentinel1; // should always be MEMHEADER_SENTINEL1
// immediately followed by data, which is followed by a MEMHEADER_SENTINEL2 byte
} memheader_t;
typedef struct mempool_s
{
uint32_t sentinel1; // should always be MEMHEADER_SENTINEL1
struct memheader_s *chain; // chain of individual memory allocations
size_t totalsize; // total memory allocated in this pool (inside memheaders)
size_t realsize; // total memory allocated in this pool (actual malloc total)
size_t lastchecksize; // updated each time the pool is displayed by memlist
struct mempool_s *next; // linked into global mempool list
const char *filename; // file name and line where Mem_AllocPool was called
int fileline;
#if XASH_64BIT
poolhandle_t idx;
#endif
char name[64]; // name of the pool
uint32_t sentinel2; // should always be MEMHEADER_SENTINEL1
} mempool_t;
static mempool_t *poolchain = NULL; // critical stuff
#if XASH_64BIT
// a1ba: due to mempool being passed with the model through reused 32-bit field
// which makes engine incompatible with 64-bit pointers I changed mempool type
// from pointer to 32-bit handle, thankfully mempool structure is private
// But! Mempools are handled through linked list so we can't index them safely
static poolhandle_t lastidx = 0;
static mempool_t *Mem_FindPool( poolhandle_t poolptr )
{
mempool_t *pool;
for( pool = poolchain; pool; pool = pool->next )
{
if( pool->idx == poolptr )
return pool;
}
Sys_Error( "%s: not allocated or double freed pool %d", __FUNCTION__, poolptr );
return NULL;
}
#else
static mempool_t *Mem_FindPool( poolhandle_t poolptr )
{
return (mempool_t *)poolptr;
}
#endif
static inline void Mem_PoolAdd( mempool_t *pool, size_t size )
{
pool->totalsize += size;
pool->realsize += sizeof( memheader_t ) + size + sizeof( byte );
}
static inline void Mem_PoolSubtract( mempool_t *pool, size_t size )
{
pool->totalsize -= size;
pool->realsize -= sizeof( memheader_t ) + size + sizeof( byte );
}
static inline void Mem_PoolLinkAlloc( mempool_t *pool, memheader_t *mem )
{
mem->next = pool->chain;
if( mem->next ) mem->next->prev = mem;
pool->chain = mem;
mem->prev = NULL;
mem->pool = pool;
}
static inline void Mem_PoolUnlinkAlloc( mempool_t *pool, memheader_t *mem )
{
if( mem->next ) mem->next->prev = mem->prev;
if( mem->prev ) mem->prev->next = mem->next;
else pool->chain = mem->next;
mem->pool = NULL;
}
static inline void Mem_InitAlloc( memheader_t *mem, size_t size, const char *filename, int fileline )
{
mem->size = size;
mem->filename = filename;
mem->fileline = fileline;
mem->sentinel1 = MEMHEADER_SENTINEL1;
*((byte *)mem + sizeof( memheader_t ) + mem->size ) = MEMHEADER_SENTINEL2;
}
static const char *Mem_CheckFilename( const char *filename )
{
static const char *dummy = "<corrupted>\0";
if( !COM_CheckString( filename ))
return dummy;
if( memchr( filename, '\0', MAX_OSPATH ) != NULL )
return filename;
return dummy;
}
static qboolean Mem_CheckAllocHeader( const char *func, const memheader_t *mem, const char *filename, int fileline )
{
const char *memfilename;
if( mem->sentinel1 != MEMHEADER_SENTINEL1 )
{
memfilename = Mem_CheckFilename( mem->filename );
Sys_Error( "%s: trashed header sentinel 1 (alloc at %s:%i, check at %s:%i)\n", func, memfilename, mem->fileline, filename, fileline );
return false;
}
if( *((byte *)mem + sizeof( memheader_t ) + mem->size ) != MEMHEADER_SENTINEL2 )
{
memfilename = Mem_CheckFilename( mem->filename ); // make sure what we don't crash var_args
Sys_Error( "%s: trashed header sentinel 2 (alloc at %s:%i, check at %s:%i)\n", func, memfilename, mem->fileline, filename, fileline );
return false;
}
return true;
}
static qboolean Mem_CheckPool( const char *func, const mempool_t *pool, const char *filename, int fileline )
{
if( pool->sentinel1 != MEMHEADER_SENTINEL1 )
{
Sys_Error( "%s: trashed pool sentinel 1 (allocpool at %s:%i, freepool at %s:%i)\n", func, pool->filename, pool->fileline, filename, fileline );
return false;
}
if( pool->sentinel2 != MEMHEADER_SENTINEL1 )
{
Sys_Error( "%s: trashed pool sentinel 2 (allocpool at %s:%i, freepool at %s:%i)\n", func, pool->filename, pool->fileline, filename, fileline );
return false;
}
return true;
}
void *_Mem_Alloc( poolhandle_t poolptr, size_t size, qboolean clear, const char *filename, int fileline )
{
memheader_t *mem;
mempool_t *pool;
if( size <= 0 )
return NULL;
if( !poolptr )
{
Sys_Error( "%s: pool == NULL (alloc at %s:%i)\n", __func__, filename, fileline );
return NULL;
}
mem = (memheader_t *)Q_malloc( sizeof( memheader_t ) + size + sizeof( byte ));
if( mem == NULL )
{
Sys_Error( "%s: out of memory (alloc size %s at %s:%i)\n", __func__, Q_memprint( size ), filename, fileline );
return NULL;
}
Mem_InitAlloc( mem, size, filename, fileline );
pool = Mem_FindPool( poolptr );
Mem_PoolAdd( pool, size );
Mem_PoolLinkAlloc( pool, mem );
if( clear )
memset((void *)((byte *)mem + sizeof( memheader_t )), 0, mem->size );
return (void *)((byte *)mem + sizeof( memheader_t ));
}
static void Mem_FreeBlock( memheader_t *mem, const char *filename, int fileline )
{
mempool_t *pool;
if( !Mem_CheckAllocHeader( __func__, mem, filename, fileline ))
return;
pool = mem->pool;
// unlink memheader from doubly linked list
if(( mem->prev ? mem->prev->next != mem : pool->chain != mem ) || ( mem->next && mem->next->prev != mem ))
{
Sys_Error( "%s: not allocated or double freed (free at %s:%i)\n", __func__, filename, fileline );
return;
}
Mem_PoolSubtract( pool, mem->size );
Mem_PoolUnlinkAlloc( pool, mem );
Q_free( mem );
}
void _Mem_Free( void *data, const char *filename, int fileline )
{
if( data == NULL )
{
Sys_Error( "Mem_Free: data == NULL (called at %s:%i)\n", filename, fileline );
return;
}
Mem_FreeBlock((memheader_t *)((byte *)data - sizeof( memheader_t )), filename, fileline );
}
void *_Mem_Realloc( poolhandle_t poolptr, void *data, size_t size, qboolean clear, const char *filename, int fileline )
{
memheader_t *mem;
uintptr_t oldmem;
mempool_t *pool;
size_t oldsize;
if( size <= 0 )
return data; // no need to reallocate
if( !poolptr )
{
Sys_Error( "Mem_Realloc: pool == NULL (alloc at %s:%i)\n", filename, fileline );
return NULL;
}
if( !data )
return _Mem_Alloc( poolptr, size, clear, filename, fileline );
mem = (memheader_t *)((byte *)data - sizeof( memheader_t ));
if( !Mem_CheckAllocHeader( "Mem_Realloc", mem, filename, fileline ))
return NULL;
oldsize = mem->size;
if( size == oldsize )
return data;
#if XASH_CUSTOM_SWAP
{
char *nb = _Mem_Alloc( poolptr, size, clear, filename, fileline );
size_t newsize = mem->size < size ? mem->size : size; // upper data can be trucnated!
memcpy( nb, data, newsize );
_Mem_Free( data, filename, fileline ); // free unused old block
return nb;
}
#else // XASH_CUSTOM_SWAP
pool = Mem_FindPool( poolptr );
oldmem = (uintptr_t)mem;
mem = realloc( mem, sizeof( memheader_t ) + size + sizeof( byte ));
if( mem == NULL )
{
Sys_Error( "Mem_Realloc: out of memory (alloc size %s at %s:%i)\n", Q_memprint( size ), filename, fileline );
return NULL;
}
// Con_Printf( S_NOTE "%s: mem %s oldmem, size before %zu now %zu (alloc at %s:%i)\n",
// __func__, (uintptr_t)mem != oldmem ? "!=" : "==", oldsize, size, filename, fileline );
Mem_InitAlloc( mem, size, filename, fileline );
if( size > oldsize )
{
Mem_PoolAdd( pool, size - oldsize );
if( clear )
memset((byte *)mem + sizeof( memheader_t ) + oldsize, 0, size - oldsize );
}
else Mem_PoolSubtract( pool, oldsize - size );
// if allocation was migrated from one pool to another
// (this is possible with original Mem_Realloc func)
if( unlikely( mem->pool != pool ))
{
Mem_PoolUnlinkAlloc( mem->pool, mem );
Mem_PoolLinkAlloc( pool, mem );
}
else if( oldmem != (uintptr_t)mem ) // just relink pointers
{
if( mem->next ) mem->next->prev = mem;
if( mem->prev ) mem->prev->next = mem;
else pool->chain = mem;
}
return (void *)((byte *)mem + sizeof( memheader_t ));
#endif // XASH_CUSTOM_SWAP
}
poolhandle_t _Mem_AllocPool( const char *name, const char *filename, int fileline )
{
mempool_t *pool;
pool = (mempool_t *)Q_malloc( sizeof( mempool_t ));
if( pool == NULL )
{
Sys_Error( "Mem_AllocPool: out of memory (allocpool at %s:%i)\n", filename, fileline );
return 0;
}
memset( pool, 0, sizeof( mempool_t ));
// fill header
pool->sentinel1 = MEMHEADER_SENTINEL1;
pool->sentinel2 = MEMHEADER_SENTINEL1;
pool->filename = filename;
pool->fileline = fileline;
pool->chain = NULL;
pool->totalsize = 0;
pool->realsize = sizeof( mempool_t );
Q_strncpy( pool->name, name, sizeof( pool->name ));
pool->next = poolchain;
poolchain = pool;
#if XASH_64BIT
pool->idx = ++lastidx;
return pool->idx;
#else
return (poolhandle_t)pool;
#endif
}
void _Mem_FreePool( poolhandle_t *poolptr, const char *filename, int fileline )
{
mempool_t *pool;
mempool_t **chainaddress;
if( *poolptr && ( pool = Mem_FindPool( *poolptr )))
{
// unlink pool from chain
for( chainaddress = &poolchain; *chainaddress && *chainaddress != pool; chainaddress = &((*chainaddress)->next));
if( *chainaddress != pool ) Sys_Error( "Mem_FreePool: pool already free (freepool at %s:%i)\n", filename, fileline );
Mem_CheckPool( "Mem_FreePool", pool, filename, fileline );
*chainaddress = pool->next;
// free memory owned by the pool
while( pool->chain ) Mem_FreeBlock( pool->chain, filename, fileline );
// free the pool itself
memset( pool, 0xBF, sizeof( mempool_t ));
Q_free( pool );
*poolptr = 0;
}
}
void _Mem_EmptyPool( poolhandle_t poolptr, const char *filename, int fileline )
{
mempool_t *pool = Mem_FindPool( poolptr );
if( !poolptr ) Sys_Error( "Mem_EmptyPool: pool == NULL (emptypool at %s:%i)\n", filename, fileline );
Mem_CheckPool( "Mem_FreePool", pool, filename, fileline );
// free memory owned by the pool
while( pool->chain ) Mem_FreeBlock( pool->chain, filename, fileline );
}
static qboolean Mem_CheckAlloc( mempool_t *pool, void *data )
{
memheader_t *header, *target;
if( pool )
{
// search only one pool
target = (memheader_t *)((byte *)data - sizeof( memheader_t ));
for( header = pool->chain; header; header = header->next )
{
if( header == target )
return true;
}
}
else
{
// search all pools
for( pool = poolchain; pool; pool = pool->next )
{
if( Mem_CheckAlloc( pool, data ))
return true;
}
}
return false;
}
/*
========================
Check pointer for memory
========================
*/
qboolean Mem_IsAllocatedExt( poolhandle_t poolptr, void *data )
{
mempool_t *pool = NULL;
if( poolptr )
pool = Mem_FindPool( poolptr );
return Mem_CheckAlloc( pool, data );
}
void _Mem_Check( const char *filename, int fileline )
{
memheader_t *mem;
mempool_t *pool;
for( pool = poolchain; pool; pool = pool->next )
Mem_CheckPool( "Mem_CheckSentinels", pool, filename, fileline );
for( pool = poolchain; pool; pool = pool->next )
for( mem = pool->chain; mem; mem = mem->next )
Mem_CheckAllocHeader( "Mem_CheckSentinels", mem, filename, fileline );
}
void Mem_PrintStats( void )
{
size_t count = 0, size = 0, realsize = 0;
mempool_t *pool;
Mem_Check();
for( pool = poolchain; pool; pool = pool->next )
{
count++;
size += pool->totalsize;
realsize += pool->realsize;
}
Con_Printf( "^3%lu^7 memory pools, totalling: ^1%s\n", count, Q_memprint( size ));
Con_Printf( "total allocated size: ^1%s\n", Q_memprint( realsize ));
}
void Mem_PrintList( size_t minallocationsize )
{
mempool_t *pool;
memheader_t *mem;
Mem_Check();
Con_Printf( "memory pool list:\n" );
Con_Printf( "\t^3size\t\t\t\tname\n");
for( pool = poolchain; pool; pool = pool->next )
{
long changed_size = (long)pool->totalsize - (long)pool->lastchecksize;
// poolnames can contain color symbols, make sure what color is reset
if( pool->lastchecksize != 0 && changed_size != 0 )
{
char sign = (changed_size < 0) ? '-' : '+';
Con_Printf( "%10s (%10s real)\t%s (^7%c%s change)\n", Q_memprint( pool->totalsize ), Q_memprint( pool->realsize ),
pool->name, sign, Q_memprint( abs( changed_size )));
}
else
{
Con_Printf( "%10s (%10s real)\t%s\n", Q_memprint( pool->totalsize ), Q_memprint( pool->realsize ), pool->name );
}
pool->lastchecksize = pool->totalsize;
for( mem = pool->chain; mem; mem = mem->next )
{
if( mem->size >= minallocationsize )
Con_Printf( "%10s allocated at %s:%i\n", Q_memprint( mem->size ), mem->filename, mem->fileline );
}
}
}
/*
========================
Memory_Init
========================
*/
void Memory_Init( void )
{
poolchain = NULL; // init mem chain
}