zone.c

   1 /*
   2 Copyright (C) 1996-1997 Id Software, Inc.
   3
   4 This program is free software; you can redistribute it and/or
   5 modify it under the terms of the GNU General Public License
   6 as published by the Free Software Foundation; either version 2
   7 of the License, or (at your option) any later version.
   8
   9 This program is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  12
  13 See the GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with this program; if not, write to the Free Software
  17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  18
  19 */
  20 // Z_zone.c
  21
  22 #include "quakedef.h"
  23 #include "thread.h"
  24
  25 #ifdef WIN32
  26 #include <windows.h>
  27 #include <winbase.h>
  28 #else
  29 #include <unistd.h>
  30 #endif
  31
  32 #ifdef _MSC_VER
  33 #include <vadefs.h>
  34 #else
  35 #include <stdint.h>
  36 #endif
  37 #define MEMHEADER_SENTINEL_FOR_ADDRESS(p) ((sentinel_seed ^ (unsigned int) (uintptr_t) (p)) + sentinel_seed)
  38 unsigned int sentinel_seed;
  39
  40 qboolean mem_bigendian = false;
  41 void *mem_mutex = NULL;
  42
  43 // divVerent: enables file backed malloc using mmap to conserve swap space (instead of malloc)
  44 #ifndef FILE_BACKED_MALLOC
  45 # define FILE_BACKED_MALLOC 0
  46 #endif
  47
  48 // LordHavoc: enables our own low-level allocator (instead of malloc)
  49 #ifndef MEMCLUMPING
  50 # define MEMCLUMPING 0
  51 #endif
  52 #ifndef MEMCLUMPING_FREECLUMPS
  53 # define MEMCLUMPING_FREECLUMPS 0
  54 #endif
  55
  56 #if MEMCLUMPING
  57 // smallest unit we care about is this many bytes
  58 #define MEMUNIT 128
  59 // try to do 32MB clumps, but overhead eats into this
  60 #ifndef MEMWANTCLUMPSIZE
  61 # define MEMWANTCLUMPSIZE (1<<27)
  62 #endif
  63 // give malloc padding so we can't waste most of a page at the end
  64 #define MEMCLUMPSIZE (MEMWANTCLUMPSIZE - MEMWANTCLUMPSIZE/MEMUNIT/32 - 128)
  65 #define MEMBITS (MEMCLUMPSIZE / MEMUNIT)
  66 #define MEMBITINTS (MEMBITS / 32)
  67
  68 typedef struct memclump_s
  69 {
  70         // contents of the clump
  71         unsigned char block[MEMCLUMPSIZE];
  72         // should always be MEMCLUMP_SENTINEL
  73         unsigned int sentinel1;
  74         // if a bit is on, it means that the MEMUNIT bytes it represents are
  75         // allocated, otherwise free
  76         unsigned int bits[MEMBITINTS];
  77         // should always be MEMCLUMP_SENTINEL
  78         unsigned int sentinel2;
  79         // if this drops to 0, the clump is freed
  80         size_t blocksinuse;
  81         // largest block of memory available (this is reset to an optimistic
  82         // number when anything is freed, and updated when alloc fails the clump)
  83         size_t largestavailable;
  84         // next clump in the chain
  85         struct memclump_s *chain;
  86 }
  87 memclump_t;
  88
  89 #if MEMCLUMPING == 2
  90 static memclump_t masterclump;
  91 #endif
  92 static memclump_t *clumpchain = NULL;
  93 #endif
  94
  95
  96 cvar_t developer_memory = {0, "developer_memory", "0", "prints debugging information about memory allocations"};
  97 cvar_t developer_memorydebug = {0, "developer_memorydebug", "0", "enables memory corruption checks (very slow)"};
  98 cvar_t sys_memsize_physical = {CVAR_READONLY, "sys_memsize_physical", "", "physical memory size in MB (or empty if unknown)"};
  99 cvar_t sys_memsize_virtual = {CVAR_READONLY, "sys_memsize_virtual", "", "virtual memory size in MB (or empty if unknown)"};
 100
 101 static mempool_t *poolchain = NULL;
 102
 103 void Mem_PrintStats(void);
 104 void Mem_PrintList(size_t minallocationsize);
 105
 106 #if FILE_BACKED_MALLOC
 107 #include <stdlib.h>
 108 #include <sys/mman.h>
 109 typedef struct mmap_data_s
 110 {
 111         size_t len;
 112 }
 113 mmap_data_t;
 114 static void *mmap_malloc(size_t size)
 115 {
 116         char vabuf[MAX_OSPATH + 1];
 117         char *tmpdir = getenv("TEMP");
 118         mmap_data_t *data;
 119         int fd;
 120         size += sizeof(mmap_data_t); // waste block
 121         dpsnprintf(vabuf, sizeof(vabuf), "%s/darkplaces.XXXXXX", tmpdir ? tmpdir : "/tmp");
 122         fd = mkstemp(vabuf);
 123         if(fd < 0)
 124                 return NULL;
 125         ftruncate(fd, size);
 126         data = (unsigned char *) mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_NORESERVE, fd, 0);
 127         close(fd);
 128         unlink(vabuf);
 129         if(!data)
 130                 return NULL;
 131         data->len = size;
 132         return (void *) (data + 1);
 133 }
 134 static void mmap_free(void *mem)
 135 {
 136         mmap_data_t *data;
 137         if(!mem)
 138                 return;
 139         data = ((mmap_data_t *) mem) - 1;
 140         munmap(data, data->len);
 141 }
 142 #define malloc mmap_malloc
 143 #define free mmap_free
 144 #endif
 145
 146 #if MEMCLUMPING != 2
 147 // some platforms have a malloc that returns NULL but succeeds later
 148 // (Windows growing its swapfile for example)
 149 static void *attempt_malloc(size_t size)
 150 {
 151         void *base;
 152         // try for half a second or so
 153         unsigned int attempts = 500;
 154         while (attempts--)
 155         {
 156                 base = (void *)malloc(size);
 157                 if (base)
 158                         return base;
 159                 Sys_Sleep(1000);
 160         }
 161         return NULL;
 162 }
 163 #endif
 164
 165 #if MEMCLUMPING
 166 static memclump_t *Clump_NewClump(void)
 167 {
 168         memclump_t **clumpchainpointer;
 169         memclump_t *clump;
 170 #if MEMCLUMPING == 2
 171         if (clumpchain)
 172                 return NULL;
 173         clump = &masterclump;
 174 #else
 175         clump = (memclump_t*)attempt_malloc(sizeof(memclump_t));
 176         if (!clump)
 177                 return NULL;
 178 #endif
 179
 180         // initialize clump
 181         if (developer_memorydebug.integer)
 182                 memset(clump, 0xEF, sizeof(*clump));
 183         clump->sentinel1 = MEMHEADER_SENTINEL_FOR_ADDRESS(&clump->sentinel1);
 184         memset(clump->bits, 0, sizeof(clump->bits));
 185         clump->sentinel2 = MEMHEADER_SENTINEL_FOR_ADDRESS(&clump->sentinel2);
 186         clump->blocksinuse = 0;
 187         clump->largestavailable = 0;
 188         clump->chain = NULL;
 189
 190         // link clump into chain
 191         for (clumpchainpointer = &clumpchain;*clumpchainpointer;clumpchainpointer = &(*clumpchainpointer)->chain)
 192                 ;
 193         *clumpchainpointer = clump;
 194
 195         return clump;
 196 }
 197 #endif
 198
 199 // low level clumping functions, all other memory functions use these
 200 static void *Clump_AllocBlock(size_t size)
 201 {
 202         unsigned char *base;
 203 #if MEMCLUMPING
 204         if (size <= MEMCLUMPSIZE)
 205         {
 206                 int index;
 207                 unsigned int bit;
 208                 unsigned int needbits;
 209                 unsigned int startbit;
 210                 unsigned int endbit;
 211                 unsigned int needints;
 212                 int startindex;
 213                 int endindex;
 214                 unsigned int value;
 215                 unsigned int mask;
 216                 unsigned int *array;
 217                 memclump_t **clumpchainpointer;
 218                 memclump_t *clump;
 219                 needbits = (size + MEMUNIT - 1) / MEMUNIT;
 220                 needints = (needbits+31)>>5;
 221                 for (clumpchainpointer = &clumpchain;;clumpchainpointer = &(*clumpchainpointer)->chain)
 222                 {
 223                         clump = *clumpchainpointer;
 224                         if (!clump)
 225                         {
 226                                 clump = Clump_NewClump();
 227                                 if (!clump)
 228                                         return NULL;
 229                         }
 230                         if (clump->sentinel1 != MEMHEADER_SENTINEL_FOR_ADDRESS(&clump->sentinel1))
 231                                 Sys_Error("Clump_AllocBlock: trashed sentinel1\n");
 232                         if (clump->sentinel2 != MEMHEADER_SENTINEL_FOR_ADDRESS(&clump->sentinel2))
 233                                 Sys_Error("Clump_AllocBlock: trashed sentinel2\n");
 234                         startbit = 0;
 235                         endbit = startbit + needbits;
 236                         array = clump->bits;
 237                         // do as fast a search as possible, even if it means crude alignment
 238                         if (needbits >= 32)
 239                         {
 240                                 // large allocations are aligned to large boundaries
 241                                 // furthermore, they are allocated downward from the top...
 242                                 endindex = MEMBITINTS;
 243                                 startindex = endindex - needints;
 244                                 index = endindex;
 245                                 while (--index >= startindex)
 246                                 {
 247                                         if (array[index])
 248                                         {
 249                                                 endindex = index;
 250                                                 startindex = endindex - needints;
 251                                                 if (startindex < 0)
 252                                                         goto nofreeblock;
 253                                         }
 254                                 }
 255                                 startbit = startindex*32;
 256                                 goto foundblock;
 257                         }
 258                         else
 259                         {
 260                                 // search for a multi-bit gap in a single int
 261                                 // (not dealing with the cases that cross two ints)
 262                                 mask = (1<<needbits)-1;
 263                                 endbit = 32-needbits;
 264                                 bit = endbit;
 265                                 for (index = 0;index < MEMBITINTS;index++)
 266                                 {
 267                                         value = array[index];
 268                                         if (value != 0xFFFFFFFFu)
 269                                         {
 270                                                 // there may be room in this one...
 271                                                 for (bit = 0;bit < endbit;bit++)
 272                                                 {
 273                                                         if (!(value & (mask<<bit)))
 274                                                         {
 275                                                                 startbit = index*32+bit;
 276                                                                 goto foundblock;
 277                                                         }
 278                                                 }
 279                                         }
 280                                 }
 281                                 goto nofreeblock;
 282                         }
 283 foundblock:
 284                         endbit = startbit + needbits;
 285                         // mark this range as used
 286                         // TODO: optimize
 287                         for (bit = startbit;bit < endbit;bit++)
 288                                 if (clump->bits[bit>>5] & (1<<(bit & 31)))
 289                                         Sys_Error("Clump_AllocBlock: internal error (%i needbits)\n", needbits);
 290                         for (bit = startbit;bit < endbit;bit++)
 291                                 clump->bits[bit>>5] |= (1<<(bit & 31));
 292                         clump->blocksinuse += needbits;
 293                         base = clump->block + startbit * MEMUNIT;
 294                         if (developer_memorydebug.integer)
 295                                 memset(base, 0xBF, needbits * MEMUNIT);
 296                         return base;
 297 nofreeblock:
 298                         ;
 299                 }
 300                 // never reached
 301                 return NULL;
 302         }
 303         // too big, allocate it directly
 304 #endif
 305 #if MEMCLUMPING == 2
 306         return NULL;
 307 #else
 308         base = (unsigned char *)attempt_malloc(size);
 309         if (base && developer_memorydebug.integer)
 310                 memset(base, 0xAF, size);
 311         return base;
 312 #endif
 313 }
 314 static void Clump_FreeBlock(void *base, size_t size)
 315 {
 316 #if MEMCLUMPING
 317         unsigned int needbits;
 318         unsigned int startbit;
 319         unsigned int endbit;
 320         unsigned int bit;
 321         memclump_t **clumpchainpointer;
 322         memclump_t *clump;
 323         unsigned char *start = (unsigned char *)base;
 324         for (clumpchainpointer = &clumpchain;(clump = *clumpchainpointer);clumpchainpointer = &(*clumpchainpointer)->chain)
 325         {
 326                 if (start >= clump->block && start < clump->block + MEMCLUMPSIZE)
 327                 {
 328                         if (clump->sentinel1 != MEMHEADER_SENTINEL_FOR_ADDRESS(&clump->sentinel1))
 329                                 Sys_Error("Clump_FreeBlock: trashed sentinel1\n");
 330                         if (clump->sentinel2 != MEMHEADER_SENTINEL_FOR_ADDRESS(&clump->sentinel2))
 331                                 Sys_Error("Clump_FreeBlock: trashed sentinel2\n");
 332                         if (start + size > clump->block + MEMCLUMPSIZE)
 333                                 Sys_Error("Clump_FreeBlock: block overrun\n");
 334                         // the block belongs to this clump, clear the range
 335                         needbits = (size + MEMUNIT - 1) / MEMUNIT;
 336                         startbit = (start - clump->block) / MEMUNIT;
 337                         endbit = startbit + needbits;
 338                         // first verify all bits are set, otherwise this may be misaligned or a double free
 339                         for (bit = startbit;bit < endbit;bit++)
 340                                 if ((clump->bits[bit>>5] & (1<<(bit & 31))) == 0)
 341                                         Sys_Error("Clump_FreeBlock: double free\n");
 342                         for (bit = startbit;bit < endbit;bit++)
 343                                 clump->bits[bit>>5] &= ~(1<<(bit & 31));
 344                         clump->blocksinuse -= needbits;
 345                         memset(base, 0xFF, needbits * MEMUNIT);
 346                         // if all has been freed, free the clump itself
 347                         if (clump->blocksinuse == 0)
 348                         {
 349                                 *clumpchainpointer = clump->chain;
 350                                 if (developer_memorydebug.integer)
 351                                         memset(clump, 0xFF, sizeof(*clump));
 352 #if MEMCLUMPING != 2
 353                                 free(clump);
 354 #endif
 355                         }
 356                         return;
 357                 }
 358         }
 359         // does not belong to any known chunk...  assume it was a direct allocation
 360 #endif
 361 #if MEMCLUMPING != 2
 362         memset(base, 0xFF, size);
 363         free(base);
 364 #endif
 365 }
 366
 367 void *_Mem_Alloc(mempool_t *pool, void *olddata, size_t size, size_t alignment, const char *filename, int fileline)
 368 {
 369         unsigned int sentinel1;
 370         unsigned int sentinel2;
 371         size_t realsize;
 372         size_t sharedsize;
 373         size_t remainsize;
 374         memheader_t *mem;
 375         memheader_t *oldmem;
 376         unsigned char *base;
 377
 378         if (size <= 0)
 379         {
 380                 if (olddata)
 381                         _Mem_Free(olddata, filename, fileline);
 382                 return NULL;
 383         }
 384         if (pool == NULL)
 385         {
 386                 if(olddata)
 387                         pool = ((memheader_t *)((unsigned char *) olddata - sizeof(memheader_t)))->pool;
 388                 else
 389                         Sys_Error("Mem_Alloc: pool == NULL (alloc at %s:%i)", filename, fileline);
 390         }
 391         if (mem_mutex)
 392                 Thread_LockMutex(mem_mutex);
 393         if (developer_memory.integer)
 394                 Con_DPrintf("Mem_Alloc: pool %s, file %s:%i, size %i bytes\n", pool->name, filename, fileline, (int)size);
 395         //if (developer.integer > 0 && developer_memorydebug.integer)
 396         //      _Mem_CheckSentinelsGlobal(filename, fileline);
 397         pool->totalsize += size;
 398         realsize = alignment + sizeof(memheader_t) + size + sizeof(sentinel2);
 399         pool->realsize += realsize;
 400         base = (unsigned char *)Clump_AllocBlock(realsize);
 401         if (base== NULL)
 402         {
 403                 Mem_PrintList(0);
 404                 Mem_PrintStats();
 405                 Mem_PrintList(1<<30);
 406                 Mem_PrintStats();
 407                 Sys_Error("Mem_Alloc: out of memory (alloc at %s:%i)", filename, fileline);
 408         }
 409         // calculate address that aligns the end of the memheader_t to the specified alignment
 410         mem = (memheader_t*)((((size_t)base + sizeof(memheader_t) + (alignment-1)) & ~(alignment-1)) - sizeof(memheader_t));
 411         mem->baseaddress = (void*)base;
 412         mem->filename = filename;
 413         mem->fileline = fileline;
 414         mem->size = size;
 415         mem->pool = pool;
 416
 417         // calculate sentinels (detects buffer overruns, in a way that is hard to exploit)
 418         sentinel1 = MEMHEADER_SENTINEL_FOR_ADDRESS(&mem->sentinel);
 419         sentinel2 = MEMHEADER_SENTINEL_FOR_ADDRESS((unsigned char *) mem + sizeof(memheader_t) + mem->size);
 420         mem->sentinel = sentinel1;
 421         memcpy((unsigned char *) mem + sizeof(memheader_t) + mem->size, &sentinel2, sizeof(sentinel2));
 422
 423         // append to head of list
 424         mem->next = pool->chain;
 425         mem->prev = NULL;
 426         pool->chain = mem;
 427         if (mem->next)
 428                 mem->next->prev = mem;
 429
 430         if (mem_mutex)
 431                 Thread_UnlockMutex(mem_mutex);
 432
 433         // copy the shared portion in the case of a realloc, then memset the rest
 434         sharedsize = 0;
 435         remainsize = size;
 436         if (olddata)
 437         {
 438                 oldmem = (memheader_t*)olddata - 1;
 439                 sharedsize = min(oldmem->size, size);
 440                 memcpy((void *)((unsigned char *) mem + sizeof(memheader_t)), olddata, sharedsize);
 441                 remainsize -= sharedsize;
 442                 _Mem_Free(olddata, filename, fileline);
 443         }
 444         memset((void *)((unsigned char *) mem + sizeof(memheader_t) + sharedsize), 0, remainsize);
 445         return (void *)((unsigned char *) mem + sizeof(memheader_t));
 446 }
 447
 448 // only used by _Mem_Free and _Mem_FreePool
 449 static void _Mem_FreeBlock(memheader_t *mem, const char *filename, int fileline)
 450 {
 451         mempool_t *pool;
 452         size_t size;
 453         size_t realsize;
 454         unsigned int sentinel1;
 455         unsigned int sentinel2;
 456
 457         // check sentinels (detects buffer overruns, in a way that is hard to exploit)
 458         sentinel1 = MEMHEADER_SENTINEL_FOR_ADDRESS(&mem->sentinel);
 459         sentinel2 = MEMHEADER_SENTINEL_FOR_ADDRESS((unsigned char *) mem + sizeof(memheader_t) + mem->size);
 460         if (mem->sentinel != sentinel1)
 461                 Sys_Error("Mem_Free: trashed head sentinel (alloc at %s:%i, free at %s:%i)", mem->filename, mem->fileline, filename, fileline);
 462         if (memcmp((unsigned char *) mem + sizeof(memheader_t) + mem->size, &sentinel2, sizeof(sentinel2)))
 463                 Sys_Error("Mem_Free: trashed tail sentinel (alloc at %s:%i, free at %s:%i)", mem->filename, mem->fileline, filename, fileline);
 464
 465         pool = mem->pool;
 466         if (developer_memory.integer)
 467                 Con_DPrintf("Mem_Free: pool %s, alloc %s:%i, free %s:%i, size %i bytes\n", pool->name, mem->filename, mem->fileline, filename, fileline, (int)(mem->size));
 468         // unlink memheader from doubly linked list
 469         if ((mem->prev ? mem->prev->next != mem : pool->chain != mem) || (mem->next && mem->next->prev != mem))
 470                 Sys_Error("Mem_Free: not allocated or double freed (free at %s:%i)", filename, fileline);
 471         if (mem_mutex)
 472                 Thread_LockMutex(mem_mutex);
 473         if (mem->prev)
 474                 mem->prev->next = mem->next;
 475         else
 476                 pool->chain = mem->next;
 477         if (mem->next)
 478                 mem->next->prev = mem->prev;
 479         // memheader has been unlinked, do the actual free now
 480         size = mem->size;
 481         realsize = sizeof(memheader_t) + size + sizeof(sentinel2);
 482         pool->totalsize -= size;
 483         pool->realsize -= realsize;
 484         Clump_FreeBlock(mem->baseaddress, realsize);
 485         if (mem_mutex)
 486                 Thread_UnlockMutex(mem_mutex);
 487 }
 488
 489 void _Mem_Free(void *data, const char *filename, int fileline)
 490 {
 491         if (data == NULL)
 492         {
 493                 Con_DPrintf("Mem_Free: data == NULL (called at %s:%i)\n", filename, fileline);
 494                 return;
 495         }
 496
 497         if (developer_memorydebug.integer)
 498         {
 499                 //_Mem_CheckSentinelsGlobal(filename, fileline);
 500                 if (!Mem_IsAllocated(NULL, data))
 501                         Sys_Error("Mem_Free: data is not allocated (called at %s:%i)", filename, fileline);
 502         }
 503
 504         _Mem_FreeBlock((memheader_t *)((unsigned char *) data - sizeof(memheader_t)), filename, fileline);
 505 }
 506
 507 mempool_t *_Mem_AllocPool(const char *name, int flags, mempool_t *parent, const char *filename, int fileline)
 508 {
 509         mempool_t *pool;
 510         if (developer_memorydebug.integer)
 511                 _Mem_CheckSentinelsGlobal(filename, fileline);
 512         pool = (mempool_t *)Clump_AllocBlock(sizeof(mempool_t));
 513         if (pool == NULL)
 514         {
 515                 Mem_PrintList(0);
 516                 Mem_PrintStats();
 517                 Mem_PrintList(1<<30);
 518                 Mem_PrintStats();
 519                 Sys_Error("Mem_AllocPool: out of memory (allocpool at %s:%i)", filename, fileline);
 520         }
 521         memset(pool, 0, sizeof(mempool_t));
 522         pool->sentinel1 = MEMHEADER_SENTINEL_FOR_ADDRESS(&pool->sentinel1);
 523         pool->sentinel2 = MEMHEADER_SENTINEL_FOR_ADDRESS(&pool->sentinel2);
 524         pool->filename = filename;
 525         pool->fileline = fileline;
 526         pool->flags = flags;
 527         pool->chain = NULL;
 528         pool->totalsize = 0;
 529         pool->realsize = sizeof(mempool_t);
 530         strlcpy (pool->name, name, sizeof (pool->name));
 531         pool->parent = parent;
 532         pool->next = poolchain;
 533         poolchain = pool;
 534         return pool;
 535 }
 536
 537 void _Mem_FreePool(mempool_t **poolpointer, const char *filename, int fileline)
 538 {
 539         mempool_t *pool = *poolpointer;
 540         mempool_t **chainaddress, *iter, *temp;
 541
 542         if (developer_memorydebug.integer)
 543                 _Mem_CheckSentinelsGlobal(filename, fileline);
 544         if (pool)
 545         {
 546                 // unlink pool from chain
 547                 for (chainaddress = &poolchain;*chainaddress && *chainaddress != pool;chainaddress = &((*chainaddress)->next));
 548                 if (*chainaddress != pool)
 549                         Sys_Error("Mem_FreePool: pool already free (freepool at %s:%i)", filename, fileline);
 550                 if (pool->sentinel1 != MEMHEADER_SENTINEL_FOR_ADDRESS(&pool->sentinel1))
 551                         Sys_Error("Mem_FreePool: trashed pool sentinel 1 (allocpool at %s:%i, freepool at %s:%i)", pool->filename, pool->fileline, filename, fileline);
 552                 if (pool->sentinel2 != MEMHEADER_SENTINEL_FOR_ADDRESS(&pool->sentinel2))
 553                         Sys_Error("Mem_FreePool: trashed pool sentinel 2 (allocpool at %s:%i, freepool at %s:%i)", pool->filename, pool->fileline, filename, fileline);
 554                 *chainaddress = pool->next;
 555
 556                 // free memory owned by the pool
 557                 while (pool->chain)
 558                         _Mem_FreeBlock(pool->chain, filename, fileline);
 559
 560                 // free child pools, too
 561                 for(iter = poolchain; iter; iter = temp) {
 562                         temp = iter->next;
 563                         if(iter->parent == pool)
 564                                 _Mem_FreePool(&temp, filename, fileline);
 565                 }
 566
 567                 // free the pool itself
 568                 Clump_FreeBlock(pool, sizeof(*pool));
 569
 570                 *poolpointer = NULL;
 571         }
 572 }
 573
 574 void _Mem_EmptyPool(mempool_t *pool, const char *filename, int fileline)
 575 {
 576         mempool_t *chainaddress;
 577
 578         if (developer_memorydebug.integer)
 579         {
 580                 //_Mem_CheckSentinelsGlobal(filename, fileline);
 581                 // check if this pool is in the poolchain
 582                 for (chainaddress = poolchain;chainaddress;chainaddress = chainaddress->next)
 583                         if (chainaddress == pool)
 584                                 break;
 585                 if (!chainaddress)
 586                         Sys_Error("Mem_EmptyPool: pool is already free (emptypool at %s:%i)", filename, fileline);
 587         }
 588         if (pool == NULL)
 589                 Sys_Error("Mem_EmptyPool: pool == NULL (emptypool at %s:%i)", filename, fileline);
 590         if (pool->sentinel1 != MEMHEADER_SENTINEL_FOR_ADDRESS(&pool->sentinel1))
 591                 Sys_Error("Mem_EmptyPool: trashed pool sentinel 1 (allocpool at %s:%i, emptypool at %s:%i)", pool->filename, pool->fileline, filename, fileline);
 592         if (pool->sentinel2 != MEMHEADER_SENTINEL_FOR_ADDRESS(&pool->sentinel2))
 593                 Sys_Error("Mem_EmptyPool: trashed pool sentinel 2 (allocpool at %s:%i, emptypool at %s:%i)", pool->filename, pool->fileline, filename, fileline);
 594
 595         // free memory owned by the pool
 596         while (pool->chain)
 597                 _Mem_FreeBlock(pool->chain, filename, fileline);
 598
 599         // empty child pools, too
 600         for(chainaddress = poolchain; chainaddress; chainaddress = chainaddress->next)
 601                 if(chainaddress->parent == pool)
 602                         _Mem_EmptyPool(chainaddress, filename, fileline);
 603
 604 }
 605
 606 void _Mem_CheckSentinels(void *data, const char *filename, int fileline)
 607 {
 608         memheader_t *mem;
 609         unsigned int sentinel1;
 610         unsigned int sentinel2;
 611
 612         if (data == NULL)
 613                 Sys_Error("Mem_CheckSentinels: data == NULL (sentinel check at %s:%i)", filename, fileline);
 614
 615         mem = (memheader_t *)((unsigned char *) data - sizeof(memheader_t));
 616         sentinel1 = MEMHEADER_SENTINEL_FOR_ADDRESS(&mem->sentinel);
 617         sentinel2 = MEMHEADER_SENTINEL_FOR_ADDRESS((unsigned char *) mem + sizeof(memheader_t) + mem->size);
 618         if (mem->sentinel != sentinel1)
 619                 Sys_Error("Mem_Free: trashed head sentinel (alloc at %s:%i, sentinel check at %s:%i)", mem->filename, mem->fileline, filename, fileline);
 620         if (memcmp((unsigned char *) mem + sizeof(memheader_t) + mem->size, &sentinel2, sizeof(sentinel2)))
 621                 Sys_Error("Mem_Free: trashed tail sentinel (alloc at %s:%i, sentinel check at %s:%i)", mem->filename, mem->fileline, filename, fileline);
 622 }
 623
 624 #if MEMCLUMPING
 625 static void _Mem_CheckClumpSentinels(memclump_t *clump, const char *filename, int fileline)
 626 {
 627         // this isn't really very useful
 628         if (clump->sentinel1 != MEMHEADER_SENTINEL_FOR_ADDRESS(&clump->sentinel1))
 629                 Sys_Error("Mem_CheckClumpSentinels: trashed sentinel 1 (sentinel check at %s:%i)", filename, fileline);
 630         if (clump->sentinel2 != MEMHEADER_SENTINEL_FOR_ADDRESS(&clump->sentinel2))
 631                 Sys_Error("Mem_CheckClumpSentinels: trashed sentinel 2 (sentinel check at %s:%i)", filename, fileline);
 632 }
 633 #endif
 634
 635 void _Mem_CheckSentinelsGlobal(const char *filename, int fileline)
 636 {
 637         memheader_t *mem;
 638 #if MEMCLUMPING
 639         memclump_t *clump;
 640 #endif
 641         mempool_t *pool;
 642         for (pool = poolchain;pool;pool = pool->next)
 643         {
 644                 if (pool->sentinel1 != MEMHEADER_SENTINEL_FOR_ADDRESS(&pool->sentinel1))
 645                         Sys_Error("Mem_CheckSentinelsGlobal: trashed pool sentinel 1 (allocpool at %s:%i, sentinel check at %s:%i)", pool->filename, pool->fileline, filename, fileline);
 646                 if (pool->sentinel2 != MEMHEADER_SENTINEL_FOR_ADDRESS(&pool->sentinel2))
 647                         Sys_Error("Mem_CheckSentinelsGlobal: trashed pool sentinel 2 (allocpool at %s:%i, sentinel check at %s:%i)", pool->filename, pool->fileline, filename, fileline);
 648         }
 649         for (pool = poolchain;pool;pool = pool->next)
 650                 for (mem = pool->chain;mem;mem = mem->next)
 651                         _Mem_CheckSentinels((void *)((unsigned char *) mem + sizeof(memheader_t)), filename, fileline);
 652 #if MEMCLUMPING
 653         for (pool = poolchain;pool;pool = pool->next)
 654                 for (clump = clumpchain;clump;clump = clump->chain)
 655                         _Mem_CheckClumpSentinels(clump, filename, fileline);
 656 #endif
 657 }
 658
 659 qboolean Mem_IsAllocated(mempool_t *pool, void *data)
 660 {
 661         memheader_t *header;
 662         memheader_t *target;
 663
 664         if (pool)
 665         {
 666                 // search only one pool
 667                 target = (memheader_t *)((unsigned char *) data - sizeof(memheader_t));
 668                 for( header = pool->chain ; header ; header = header->next )
 669                         if( header == target )
 670                                 return true;
 671         }
 672         else
 673         {
 674                 // search all pools
 675                 for (pool = poolchain;pool;pool = pool->next)
 676                         if (Mem_IsAllocated(pool, data))
 677                                 return true;
 678         }
 679         return false;
 680 }
 681
 682 void Mem_ExpandableArray_NewArray(memexpandablearray_t *l, mempool_t *mempool, size_t recordsize, int numrecordsperarray)
 683 {
 684         memset(l, 0, sizeof(*l));
 685         l->mempool = mempool;
 686         l->recordsize = recordsize;
 687         l->numrecordsperarray = numrecordsperarray;
 688 }
 689
 690 void Mem_ExpandableArray_FreeArray(memexpandablearray_t *l)
 691 {
 692         size_t i;
 693         if (l->maxarrays)
 694         {
 695                 for (i = 0;i != l->numarrays;i++)
 696                         Mem_Free(l->arrays[i].data);
 697                 Mem_Free(l->arrays);
 698         }
 699         memset(l, 0, sizeof(*l));
 700 }
 701
 702 void *Mem_ExpandableArray_AllocRecord(memexpandablearray_t *l)
 703 {
 704         size_t i, j;
 705         for (i = 0;;i++)
 706         {
 707                 if (i == l->numarrays)
 708                 {
 709                         if (l->numarrays == l->maxarrays)
 710                         {
 711                                 memexpandablearray_array_t *oldarrays = l->arrays;
 712                                 l->maxarrays = max(l->maxarrays * 2, 128);
 713                                 l->arrays = (memexpandablearray_array_t*) Mem_Alloc(l->mempool, l->maxarrays * sizeof(*l->arrays));
 714                                 if (oldarrays)
 715                                 {
 716                                         memcpy(l->arrays, oldarrays, l->numarrays * sizeof(*l->arrays));
 717                                         Mem_Free(oldarrays);
 718                                 }
 719                         }
 720                         l->arrays[i].numflaggedrecords = 0;
 721                         l->arrays[i].data = (unsigned char *) Mem_Alloc(l->mempool, (l->recordsize + 1) * l->numrecordsperarray);
 722                         l->arrays[i].allocflags = l->arrays[i].data + l->recordsize * l->numrecordsperarray;
 723                         l->numarrays++;
 724                 }
 725                 if (l->arrays[i].numflaggedrecords < l->numrecordsperarray)
 726                 {
 727                         for (j = 0;j < l->numrecordsperarray;j++)
 728                         {
 729                                 if (!l->arrays[i].allocflags[j])
 730                                 {
 731                                         l->arrays[i].allocflags[j] = true;
 732                                         l->arrays[i].numflaggedrecords++;
 733                                         memset(l->arrays[i].data + l->recordsize * j, 0, l->recordsize);
 734                                         return (void *)(l->arrays[i].data + l->recordsize * j);
 735                                 }
 736                         }
 737                 }
 738         }
 739 }
 740
 741 /*****************************************************************************
 742  * IF YOU EDIT THIS:
 743  * If this function was to change the size of the "expandable" array, you have
 744  * to update r_shadow.c
 745  * Just do a search for "range =", R_ShadowClearWorldLights would be the first
 746  * function to look at. (And also seems like the only one?) You  might have to
 747  * move the  call to Mem_ExpandableArray_IndexRange  back into for(...) loop's
 748  * condition
 749  */
 750 void Mem_ExpandableArray_FreeRecord(memexpandablearray_t *l, void *record) // const!
 751 {
 752         size_t i, j;
 753         unsigned char *p = (unsigned char *)record;
 754         for (i = 0;i != l->numarrays;i++)
 755         {
 756                 if (p >= l->arrays[i].data && p < (l->arrays[i].data + l->recordsize * l->numrecordsperarray))
 757                 {
 758                         j = (p - l->arrays[i].data) / l->recordsize;
 759                         if (p != l->arrays[i].data + j * l->recordsize)
 760                                 Sys_Error("Mem_ExpandableArray_FreeRecord: no such record %p\n", p);
 761                         if (!l->arrays[i].allocflags[j])
 762                                 Sys_Error("Mem_ExpandableArray_FreeRecord: record %p is already free!\n", p);
 763                         l->arrays[i].allocflags[j] = false;
 764                         l->arrays[i].numflaggedrecords--;
 765                         return;
 766                 }
 767         }
 768 }
 769
 770 size_t Mem_ExpandableArray_IndexRange(const memexpandablearray_t *l)
 771 {
 772         size_t i, j, k, end = 0;
 773         for (i = 0;i < l->numarrays;i++)
 774         {
 775                 for (j = 0, k = 0;k < l->arrays[i].numflaggedrecords;j++)
 776                 {
 777                         if (l->arrays[i].allocflags[j])
 778                         {
 779                                 end = l->numrecordsperarray * i + j + 1;
 780                                 k++;
 781                         }
 782                 }
 783         }
 784         return end;
 785 }
 786
 787 void *Mem_ExpandableArray_RecordAtIndex(const memexpandablearray_t *l, size_t index)
 788 {
 789         size_t i, j;
 790         i = index / l->numrecordsperarray;
 791         j = index % l->numrecordsperarray;
 792         if (i >= l->numarrays || !l->arrays[i].allocflags[j])
 793                 return NULL;
 794         return (void *)(l->arrays[i].data + j * l->recordsize);
 795 }
 796
 797
 798 // used for temporary memory allocations around the engine, not for longterm
 799 // storage, if anything in this pool stays allocated during gameplay, it is
 800 // considered a leak
 801 mempool_t *tempmempool;
 802 // only for zone
 803 mempool_t *zonemempool;
 804
 805 void Mem_PrintStats(void)
 806 {
 807         size_t count = 0, size = 0, realsize = 0;
 808         mempool_t *pool;
 809         memheader_t *mem;
 810         Mem_CheckSentinelsGlobal();
 811         for (pool = poolchain;pool;pool = pool->next)
 812         {
 813                 count++;
 814                 size += pool->totalsize;
 815                 realsize += pool->realsize;
 816         }
 817         Con_Printf("%lu memory pools, totalling %lu bytes (%.3fMB)\n", (unsigned long)count, (unsigned long)size, size / 1048576.0);
 818         Con_Printf("total allocated size: %lu bytes (%.3fMB)\n", (unsigned long)realsize, realsize / 1048576.0);
 819         for (pool = poolchain;pool;pool = pool->next)
 820         {
 821                 if ((pool->flags & POOLFLAG_TEMP) && pool->chain)
 822                 {
 823                         Con_Printf("Memory pool %p has sprung a leak totalling %lu bytes (%.3fMB)!  Listing contents...\n", (void *)pool, (unsigned long)pool->totalsize, pool->totalsize / 1048576.0);
 824                         for (mem = pool->chain;mem;mem = mem->next)
 825                                 Con_Printf("%10lu bytes allocated at %s:%i\n", (unsigned long)mem->size, mem->filename, mem->fileline);
 826                 }
 827         }
 828 }
 829
 830 void Mem_PrintList(size_t minallocationsize)
 831 {
 832         mempool_t *pool;
 833         memheader_t *mem;
 834         Mem_CheckSentinelsGlobal();
 835         Con_Print("memory pool list:\n"
 836                    "size    name\n");
 837         for (pool = poolchain;pool;pool = pool->next)
 838         {
 839                 Con_Printf("%10luk (%10luk actual) %s (%+li byte change) %s\n", (unsigned long) ((pool->totalsize + 1023) / 1024), (unsigned long)((pool->realsize + 1023) / 1024), pool->name, (long)(pool->totalsize - pool->lastchecksize), (pool->flags & POOLFLAG_TEMP) ? "TEMP" : "");
 840                 pool->lastchecksize = pool->totalsize;
 841                 for (mem = pool->chain;mem;mem = mem->next)
 842                         if (mem->size >= minallocationsize)
 843                                 Con_Printf("%10lu bytes allocated at %s:%i\n", (unsigned long)mem->size, mem->filename, mem->fileline);
 844         }
 845 }
 846
 847 static void MemList_f(void)
 848 {
 849         switch(Cmd_Argc())
 850         {
 851         case 1:
 852                 Mem_PrintList(1<<30);
 853                 Mem_PrintStats();
 854                 break;
 855         case 2:
 856                 Mem_PrintList(atoi(Cmd_Argv(1)) * 1024);
 857                 Mem_PrintStats();
 858                 break;
 859         default:
 860                 Con_Print("MemList_f: unrecognized options\nusage: memlist [all]\n");
 861                 break;
 862         }
 863 }
 864
 865 static void MemStats_f(void)
 866 {
 867         Mem_CheckSentinelsGlobal();
 868         R_TextureStats_Print(false, false, true);
 869         GL_Mesh_ListVBOs(false);
 870         Mem_PrintStats();
 871 }
 872
 873
 874 char* Mem_strdup (mempool_t *pool, const char* s)
 875 {
 876         char* p;
 877         size_t sz;
 878         if (s == NULL)
 879                 return NULL;
 880         sz = strlen (s) + 1;
 881         p = (char*)Mem_Alloc (pool, sz);
 882         strlcpy (p, s, sz);
 883         return p;
 884 }
 885
 886 /*
 887 ========================
 888 Memory_Init
 889 ========================
 890 */
 891 void Memory_Init (void)
 892 {
 893         static union {unsigned short s;unsigned char b[2];} u;
 894         u.s = 0x100;
 895         mem_bigendian = u.b[0] != 0;
 896
 897         sentinel_seed = rand();
 898         poolchain = NULL;
 899         tempmempool = Mem_AllocPool("Temporary Memory", POOLFLAG_TEMP, NULL);
 900         zonemempool = Mem_AllocPool("Zone", 0, NULL);
 901
 902         if (Thread_HasThreads())
 903                 mem_mutex = Thread_CreateMutex();
 904 }
 905
 906 void Memory_Shutdown (void)
 907 {
 908 //      Mem_FreePool (&zonemempool);
 909 //      Mem_FreePool (&tempmempool);
 910
 911         if (mem_mutex)
 912                 Thread_DestroyMutex(mem_mutex);
 913         mem_mutex = NULL;
 914 }
 915
 916 void Memory_Init_Commands (void)
 917 {
 918         Cmd_AddCommand ("memstats", MemStats_f, "prints memory system statistics");
 919         Cmd_AddCommand ("memlist", MemList_f, "prints memory pool information (or if used as memlist 5 lists individual allocations of 5K or larger, 0 lists all allocations)");
 920         Cvar_RegisterVariable (&developer_memory);
 921         Cvar_RegisterVariable (&developer_memorydebug);
 922         Cvar_RegisterVariable (&sys_memsize_physical);
 923         Cvar_RegisterVariable (&sys_memsize_virtual);
 924
 925 #if defined(WIN32)
 926 #ifdef _WIN64
 927         {
 928                 MEMORYSTATUSEX status;
 929                 // first guess
 930                 Cvar_SetValueQuick(&sys_memsize_virtual, 8388608);
 931                 // then improve
 932                 status.dwLength = sizeof(status);
 933                 if(GlobalMemoryStatusEx(&status))
 934                 {
 935                         Cvar_SetValueQuick(&sys_memsize_physical, status.ullTotalPhys / 1048576.0);
 936                         Cvar_SetValueQuick(&sys_memsize_virtual, min(sys_memsize_virtual.value, status.ullTotalVirtual / 1048576.0));
 937                 }
 938         }
 939 #else
 940         {
 941                 MEMORYSTATUS status;
 942                 // first guess
 943                 Cvar_SetValueQuick(&sys_memsize_virtual, 2048);
 944                 // then improve
 945                 status.dwLength = sizeof(status);
 946                 GlobalMemoryStatus(&status);
 947                 Cvar_SetValueQuick(&sys_memsize_physical, status.dwTotalPhys / 1048576.0);
 948                 Cvar_SetValueQuick(&sys_memsize_virtual, min(sys_memsize_virtual.value, status.dwTotalVirtual / 1048576.0));
 949         }
 950 #endif
 951 #else
 952         {
 953                 // first guess
 954                 Cvar_SetValueQuick(&sys_memsize_virtual, (sizeof(void*) == 4) ? 2048 : 268435456);
 955                 // then improve
 956                 {
 957                         // Linux, and BSD with linprocfs mounted
 958                         FILE *f = fopen("/proc/meminfo", "r");
 959                         if(f)
 960                         {
 961                                 static char buf[1024];
 962                                 while(fgets(buf, sizeof(buf), f))
 963                                 {
 964                                         const char *p = buf;
 965                                         if(!COM_ParseToken_Console(&p))
 966                                                 continue;
 967                                         if(!strcmp(com_token, "MemTotal:"))
 968                                         {
 969                                                 if(!COM_ParseToken_Console(&p))
 970                                                         continue;
 971                                                 Cvar_SetValueQuick(&sys_memsize_physical, atof(com_token) / 1024.0);
 972                                         }
 973                                         if(!strcmp(com_token, "SwapTotal:"))
 974                                         {
 975                                                 if(!COM_ParseToken_Console(&p))
 976                                                         continue;
 977                                                 Cvar_SetValueQuick(&sys_memsize_virtual, min(sys_memsize_virtual.value , atof(com_token) / 1024.0 + sys_memsize_physical.value));
 978                                         }
 979                                 }
 980                                 fclose(f);
 981                         }
 982                 }
 983         }
 984 #endif
 985 }
 986