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  1. /*
  2. ** $Id: lparser.h,v 1.65 2010/07/07 16:27:29 roberto Exp $
  3. ** Lua Parser
  4. ** See Copyright Notice in lua.h
  5. */
  6.  
  7. #ifndef lparser_h
  8. #define lparser_h
  9.  
  10. #include "llimits.h"
  11. #include "lobject.h"
  12. #include "lzio.h"
  13.  
  14.  
  15. /*
  16. ** Expression descriptor
  17. */
  18.  
  19. typedef enum {
  20.   VVOID,        /* no value */
  21.   VNIL,
  22.   VTRUE,
  23.   VFALSE,
  24.   VK,           /* info = index of constant in `k' */
  25.   VKNUM,        /* nval = numerical value */
  26.   VNONRELOC,    /* info = result register */
  27.   VLOCAL,       /* info = local register */
  28.   VUPVAL,       /* info = index of upvalue in 'upvalues' */
  29.   VINDEXED,     /* t = table register/upvalue; idx = index R/K */
  30.   VJMP,         /* info = instruction pc */
  31.   VRELOCABLE,   /* info = instruction pc */
  32.   VCALL,        /* info = instruction pc */
  33.   VVARARG       /* info = instruction pc */
  34. } expkind;
  35.  
  36.  
  37. #define vkisvar(k)      (VLOCAL <= (k) && (k) <= VINDEXED)
  38. #define vkisinreg(k)    ((k) == VNONRELOC || (k) == VLOCAL)
  39.  
  40. typedef struct expdesc {
  41.   expkind k;
  42.   union {
  43.     struct {  /* for indexed variables (VINDEXED) */
  44.       short idx;  /* index (R/K) */
  45.       lu_byte t;  /* table (register or upvalue) */
  46.       lu_byte vt;  /* whether 't' is register (VLOCAL) or upvalue (VUPVAL) */
  47.     } ind;
  48.     int info;  /* for generic use */
  49.     lua_Number nval;  /* for VKNUM */
  50.   } u;
  51.   int t;  /* patch list of `exit when true' */
  52.   int f;  /* patch list of `exit when false' */
  53. } expdesc;
  54.  
  55.  
  56. typedef struct vardesc {
  57.   unsigned short idx;
  58. } vardesc;
  59.  
  60.  
  61. /* list of all active local variables */
  62. typedef struct Varlist {
  63.   vardesc *actvar;
  64.   int nactvar;
  65.   int actvarsize;
  66. } Varlist;
  67.  
  68.  
  69. struct BlockCnt;  /* defined in lparser.c */
  70.  
  71.  
  72. /* state needed to generate code for a given function */
  73. typedef struct FuncState {
  74.   Proto *f;  /* current function header */
  75.   Table *h;  /* table to find (and reuse) elements in `k' */
  76.   struct FuncState *prev;  /* enclosing function */
  77.   struct LexState *ls;  /* lexical state */
  78.   struct lua_State *L;  /* copy of the Lua state */
  79.   struct BlockCnt *bl;  /* chain of current blocks */
  80.   int pc;  /* next position to code (equivalent to `ncode') */
  81.   int lasttarget;   /* `pc' of last `jump target' */
  82.   int jpc;  /* list of pending jumps to `pc' */
  83.   int freereg;  /* first free register */
  84.   int nk;  /* number of elements in `k' */
  85.   int np;  /* number of elements in `p' */
  86.   int firstlocal;  /* index of first local var of this function */
  87.   short nlocvars;  /* number of elements in `locvars' */
  88.   lu_byte nactvar;  /* number of active local variables */
  89.   lu_byte nups;  /* number of upvalues */
  90. } FuncState;
  91.  
  92.  
  93. LUAI_FUNC Proto *luaY_parser (lua_State *L, ZIO *z, Mbuffer *buff,
  94.                               Varlist *varl, const char *name);
  95.  
  96.  
  97. #endif
  98.