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  1. /*
  2. ** $Id: lgc.h,v 2.15.1.1 2007/12/27 13:02:25 roberto Exp $
  3. ** Garbage Collector
  4. ** See Copyright Notice in lua.h
  5. */
  6.  
  7. #ifndef lgc_h
  8. #define lgc_h
  9.  
  10.  
  11. #include "lobject.h"
  12.  
  13.  
  14. /*
  15. ** Possible states of the Garbage Collector
  16. */
  17. #define GCSpause        0
  18. #define GCSpropagate    1
  19. #define GCSsweepstring  2
  20. #define GCSsweep        3
  21. #define GCSfinalize     4
  22.  
  23.  
  24. /*
  25. ** some userful bit tricks
  26. */
  27. #define resetbits(x,m)  ((x) &= cast(lu_byte, ~(m)))
  28. #define setbits(x,m)    ((x) |= (m))
  29. #define testbits(x,m)   ((x) & (m))
  30. #define bitmask(b)      (1<<(b))
  31. #define bit2mask(b1,b2) (bitmask(b1) | bitmask(b2))
  32. #define l_setbit(x,b)   setbits(x, bitmask(b))
  33. #define resetbit(x,b)   resetbits(x, bitmask(b))
  34. #define testbit(x,b)    testbits(x, bitmask(b))
  35. #define set2bits(x,b1,b2)       setbits(x, (bit2mask(b1, b2)))
  36. #define reset2bits(x,b1,b2)     resetbits(x, (bit2mask(b1, b2)))
  37. #define test2bits(x,b1,b2)      testbits(x, (bit2mask(b1, b2)))
  38.  
  39.  
  40.  
  41. /*
  42. ** Layout for bit use in `marked' field:
  43. ** bit 0 - object is white (type 0)
  44. ** bit 1 - object is white (type 1)
  45. ** bit 2 - object is black
  46. ** bit 3 - for userdata: has been finalized
  47. ** bit 3 - for tables: has weak keys
  48. ** bit 4 - for tables: has weak values
  49. ** bit 5 - object is fixed (should not be collected)
  50. ** bit 6 - object is "super" fixed (only the main thread)
  51. */
  52.  
  53.  
  54. #define WHITE0BIT       0
  55. #define WHITE1BIT       1
  56. #define BLACKBIT        2
  57. #define FINALIZEDBIT    3
  58. #define KEYWEAKBIT      3
  59. #define VALUEWEAKBIT    4
  60. #define FIXEDBIT        5
  61. #define SFIXEDBIT       6
  62. #define WHITEBITS       bit2mask(WHITE0BIT, WHITE1BIT)
  63.  
  64.  
  65. #define iswhite(x)      test2bits((x)->gch.marked, WHITE0BIT, WHITE1BIT)
  66. #define isblack(x)      testbit((x)->gch.marked, BLACKBIT)
  67. #define isgray(x)       (!isblack(x) && !iswhite(x))
  68.  
  69. #define otherwhite(g)   (g->currentwhite ^ WHITEBITS)
  70. #define isdead(g,v)     ((v)->gch.marked & otherwhite(g) & WHITEBITS)
  71.  
  72. #define changewhite(x)  ((x)->gch.marked ^= WHITEBITS)
  73. #define gray2black(x)   l_setbit((x)->gch.marked, BLACKBIT)
  74.  
  75. #define valiswhite(x)   (iscollectable(x) && iswhite(gcvalue(x)))
  76.  
  77. #define luaC_white(g)   cast(lu_byte, (g)->currentwhite & WHITEBITS)
  78.  
  79.  
  80. #define luaC_checkGC(L) { \
  81.   condhardstacktests(luaD_reallocstack(L, L->stacksize - EXTRA_STACK - 1)); \
  82.   if (G(L)->totalbytes >= G(L)->GCthreshold) \
  83.         luaC_step(L); }
  84.  
  85.  
  86. #define luaC_barrier(L,p,v) { if (valiswhite(v) && isblack(obj2gco(p)))  \
  87.         luaC_barrierf(L,obj2gco(p),gcvalue(v)); }
  88.  
  89. #define luaC_barriert(L,t,v) { if (valiswhite(v) && isblack(obj2gco(t)))  \
  90.         luaC_barrierback(L,t); }
  91.  
  92. #define luaC_objbarrier(L,p,o)  \
  93.         { if (iswhite(obj2gco(o)) && isblack(obj2gco(p))) \
  94.                 luaC_barrierf(L,obj2gco(p),obj2gco(o)); }
  95.  
  96. #define luaC_objbarriert(L,t,o)  \
  97.    { if (iswhite(obj2gco(o)) && isblack(obj2gco(t))) luaC_barrierback(L,t); }
  98.  
  99. LUAI_FUNC size_t luaC_separateudata (lua_State *L, int all);
  100. LUAI_FUNC void luaC_callGCTM (lua_State *L);
  101. LUAI_FUNC void luaC_freeall (lua_State *L);
  102. LUAI_FUNC void luaC_step (lua_State *L);
  103. LUAI_FUNC void luaC_fullgc (lua_State *L);
  104. LUAI_FUNC void luaC_link (lua_State *L, GCObject *o, lu_byte tt);
  105. LUAI_FUNC void luaC_linkupval (lua_State *L, UpVal *uv);
  106. LUAI_FUNC void luaC_barrierf (lua_State *L, GCObject *o, GCObject *v);
  107. LUAI_FUNC void luaC_barrierback (lua_State *L, Table *t);
  108.  
  109.  
  110. #endif
  111.