text: /*
  ** $Id: lparser.h,v 1.57.1.1 2007/12/27 13:02:25 roberto Exp $
  ** Lua Parser
  ** See Copyright Notice in lua.h
  */
  
  #ifndef lparser_h
  #define lparser_h
  
  #include "llimits.h"
  #include "lobject.h"
  #include "lzio.h"
  
  NAMESPACE_LUA_BEGIN
  
  /*
  ** Expression descriptor
  */
  
  typedef enum {
    VVOID,	/* no value */
    VNIL,
    VTRUE,
    VFALSE,
    VK,		/* info = index of constant in `k' */
    VKNUM,	/* nval = numerical value */
    VLOCAL,	/* info = local register */
    VUPVAL,       /* info = index of upvalue in `upvalues' */
    VGLOBAL,	/* info = index of table; aux = index of global name in `k' */
    VINDEXED,	/* info = table register; aux = index register (or `k') */
    VJMP,		/* info = instruction pc */
    VRELOCABLE,	/* info = instruction pc */
    VNONRELOC,	/* info = result register */
    VCALL,	/* info = instruction pc */
    VVARARG	/* info = instruction pc */
  } expkind;
  
  typedef struct expdesc {
    expkind k;
    union {
      struct { int info, aux; } s;
      lua_Number nval;
    } u;
    int t;  /* patch list of `exit when true' */
    int f;  /* patch list of `exit when false' */
  } expdesc;
  
  
  typedef struct upvaldesc {
    lu_byte k;
    lu_byte info;
  } upvaldesc;
  
  
  struct BlockCnt;  /* defined in lparser.c */
  
  
  /* state needed to generate code for a given function */
  typedef struct FuncState {
    Proto *f;  /* current function header */
    Table *h;  /* table to find (and reuse) elements in `k' */
    struct FuncState *prev;  /* enclosing function */
    struct LexState *ls;  /* lexical state */
    struct lua_State *L;  /* copy of the Lua state */
    struct BlockCnt *bl;  /* chain of current blocks */
    int pc;  /* next position to code (equivalent to `ncode') */
    int lasttarget;   /* `pc' of last `jump target' */
    int jpc;  /* list of pending jumps to `pc' */
    int freereg;  /* first free register */
    int nk;  /* number of elements in `k' */
    int np;  /* number of elements in `p' */
  #if LUA_EXT_CONTINUE
    int prohibitedloc;  /* index (into actvar) of first prohibited local */
  #endif /* LUA_EXT_CONTINUE */
    short nlocvars;  /* number of elements in `locvars' */
    lu_byte nactvar;  /* number of active local variables */
    upvaldesc upvalues[LUAI_MAXUPVALUES];  /* upvalues */
    unsigned short actvar[LUAI_MAXVARS];  /* declared-variable stack */
  } FuncState;
  
  
  LUAI_FUNC Proto *luaY_parser (lua_State *L, ZIO *z, Mbuffer *buff,
                                              const char *name);
  
  NAMESPACE_LUA_END
  
  #endif
  