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  1. // Emacs style mode select   -*- C++ -*-
  2. //-----------------------------------------------------------------------------
  3. //
  4. // $Id:$
  5. //
  6. // Copyright (C) 1993-1996 by id Software, Inc.
  7. //
  8. // This source is available for distribution and/or modification
  9. // only under the terms of the DOOM Source Code License as
  10. // published by id Software. All rights reserved.
  11. //
  12. // The source is distributed in the hope that it will be useful,
  13. // but WITHOUT ANY WARRANTY; without even the implied warranty of
  14. // FITNESS FOR A PARTICULAR PURPOSE. See the DOOM Source Code License
  15. // for more details.
  16. //
  17. // DESCRIPTION:
  18. //      Zone Memory Allocation, perhaps NeXT ObjectiveC inspired.
  19. //      Remark: this was the only stuff that, according
  20. //       to John Carmack, might have been useful for
  21. //       Quake.
  22. //
  23. //---------------------------------------------------------------------
  24.  
  25.  
  26.  
  27. #ifndef __Z_ZONE__
  28. #define __Z_ZONE__
  29.  
  30. #include <stdio.h>
  31.  
  32. //
  33. // ZONE MEMORY
  34. // PU - purge tags.
  35. // Tags < 100 are not overwritten until freed.
  36. #define PU_STATIC               1       // static entire execution time
  37. #define PU_SOUND                2       // static while playing
  38. #define PU_MUSIC                3       // static while playing
  39. #define PU_DAVE         4       // anything else Dave wants static
  40. #define PU_LEVEL                50      // static until level exited
  41. #define PU_LEVSPEC              51      // a special thinker in a level
  42. // Tags >= 100 are purgable whenever needed.
  43. #define PU_PURGELEVEL   100
  44. #define PU_CACHE                101
  45.  
  46.  
  47. void    Z_Init (void);
  48. void*   Z_Malloc (int size, int tag, void *ptr);
  49. void    Z_Free (void *ptr);
  50. void    Z_FreeTags (int lowtag, int hightag);
  51. void    Z_DumpHeap (int lowtag, int hightag);
  52. void    Z_FileDumpHeap (FILE *f);
  53. void    Z_CheckHeap (void);
  54. void    Z_ChangeTag2 (void *ptr, int tag);
  55. int     Z_FreeMemory (void);
  56.  
  57.  
  58. typedef struct memblock_s
  59. {
  60.     int                 size;   // including the header and possibly tiny fragments
  61.     void**              user;   // NULL if a free block
  62.     int                 tag;    // purgelevel
  63.     int                 id;     // should be ZONEID
  64.     struct memblock_s*  next;
  65.     struct memblock_s*  prev;
  66. } memblock_t;
  67.  
  68. //
  69. // This is used to get the local FILE:LINE info from CPP
  70. // prior to really call the function in question.
  71. //
  72. #define Z_ChangeTag(p,t) \
  73. { \
  74.       if (( (memblock_t *)( (byte *)(p) - sizeof(memblock_t)))->id!=0x1d4a11) \
  75.           I_Error("Z_CT at "__FILE__":%i",__LINE__); \
  76.           Z_ChangeTag2(p,t); \
  77. };
  78.  
  79.  
  80.  
  81. #endif
  82. //-----------------------------------------------------------------------------
  83. //
  84. // $Log:$
  85. //
  86. //-----------------------------------------------------------------------------
  87.