Mercurial > vba-linux

     1 /*

     2 ** $Id: lparser.h,v 1.57.1.1 2007/12/27 13:02:25 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   VLOCAL,	/* info = local register */

    27   VUPVAL,       /* info = index of upvalue in `upvalues' */

    28   VGLOBAL,	/* info = index of table; aux = index of global name in `k' */

    29   VINDEXED,	/* info = table register; aux = index register (or `k') */

    30   VJMP,		/* info = instruction pc */

    31   VRELOCABLE,	/* info = instruction pc */

    32   VNONRELOC,	/* info = result register */

    33   VCALL,	/* info = instruction pc */

    34   VVARARG	/* info = instruction pc */

    35 } expkind;

    36 

    37 typedef struct expdesc {

    38   expkind k;

    39   union {

    40     struct { int info, aux; } s;

    41     lua_Number nval;

    42   } u;

    43   int t;  /* patch list of `exit when true' */

    44   int f;  /* patch list of `exit when false' */

    45 } expdesc;

    46 

    47 

    48 typedef struct upvaldesc {

    49   lu_byte k;

    50   lu_byte info;

    51 } upvaldesc;

    52 

    53 

    54 struct BlockCnt;  /* defined in lparser.c */

    55 

    56 

    57 /* state needed to generate code for a given function */

    58 typedef struct FuncState {

    59   Proto *f;  /* current function header */

    60   Table *h;  /* table to find (and reuse) elements in `k' */

    61   struct FuncState *prev;  /* enclosing function */

    62   struct LexState *ls;  /* lexical state */

    63   struct lua_State *L;  /* copy of the Lua state */

    64   struct BlockCnt *bl;  /* chain of current blocks */

    65   int pc;  /* next position to code (equivalent to `ncode') */

    66   int lasttarget;   /* `pc' of last `jump target' */

    67   int jpc;  /* list of pending jumps to `pc' */

    68   int freereg;  /* first free register */

    69   int nk;  /* number of elements in `k' */

    70   int np;  /* number of elements in `p' */

    71   short nlocvars;  /* number of elements in `locvars' */

    72   lu_byte nactvar;  /* number of active local variables */

    73   upvaldesc upvalues[LUAI_MAXUPVALUES];  /* upvalues */

    74   unsigned short actvar[LUAI_MAXVARS];  /* declared-variable stack */

    75 } FuncState;

    76 

    77 

    78 LUAI_FUNC Proto *luaY_parser (lua_State *L, ZIO *z, Mbuffer *buff,

    79                                             const char *name);

    80 

    81 

    82 #endif
author	Robert McIntyre <rlm@mit.edu>
date	Sat, 03 Mar 2012 11:44:47 -0600
parents	27763b933818
children