misc/liblua/lparser.h
author sheepluva
Wed, 31 Mar 2010 20:03:43 +0000
changeset 3215 a1a057f77ada
parent 2812 0a24853de796
child 10017 de822cd3df3a
permissions -rw-r--r--
YOUR AD HERE! (just fixed a typo)
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/*
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** $Id: lparser.h,v 1.57.1.1 2007/12/27 13:02:25 roberto Exp $
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** Lua Parser
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** See Copyright Notice in lua.h
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*/
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#ifndef lparser_h
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#define lparser_h
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#include "llimits.h"
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#include "lobject.h"
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#include "lzio.h"
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/*
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** Expression descriptor
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*/
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typedef enum {
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  VVOID,	/* no value */
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  VNIL,
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  VTRUE,
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  VFALSE,
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  VK,		/* info = index of constant in `k' */
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  VKNUM,	/* nval = numerical value */
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  VLOCAL,	/* info = local register */
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  VUPVAL,       /* info = index of upvalue in `upvalues' */
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  VGLOBAL,	/* info = index of table; aux = index of global name in `k' */
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  VINDEXED,	/* info = table register; aux = index register (or `k') */
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  VJMP,		/* info = instruction pc */
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  VRELOCABLE,	/* info = instruction pc */
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  VNONRELOC,	/* info = result register */
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  VCALL,	/* info = instruction pc */
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  VVARARG	/* info = instruction pc */
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} expkind;
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typedef struct expdesc {
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  expkind k;
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  union {
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    struct { int info, aux; } s;
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    lua_Number nval;
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  } u;
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  int t;  /* patch list of `exit when true' */
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  int f;  /* patch list of `exit when false' */
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} expdesc;
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typedef struct upvaldesc {
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  lu_byte k;
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  lu_byte info;
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} upvaldesc;
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struct BlockCnt;  /* defined in lparser.c */
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/* state needed to generate code for a given function */
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typedef struct FuncState {
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  Proto *f;  /* current function header */
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  Table *h;  /* table to find (and reuse) elements in `k' */
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  struct FuncState *prev;  /* enclosing function */
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  struct LexState *ls;  /* lexical state */
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  struct lua_State *L;  /* copy of the Lua state */
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  struct BlockCnt *bl;  /* chain of current blocks */
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  int pc;  /* next position to code (equivalent to `ncode') */
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  int lasttarget;   /* `pc' of last `jump target' */
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  int jpc;  /* list of pending jumps to `pc' */
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  int freereg;  /* first free register */
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  int nk;  /* number of elements in `k' */
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  int np;  /* number of elements in `p' */
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  short nlocvars;  /* number of elements in `locvars' */
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  lu_byte nactvar;  /* number of active local variables */
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  upvaldesc upvalues[LUAI_MAXUPVALUES];  /* upvalues */
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  unsigned short actvar[LUAI_MAXVARS];  /* declared-variable stack */
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} FuncState;
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LUAI_FUNC Proto *luaY_parser (lua_State *L, ZIO *z, Mbuffer *buff,
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                                            const char *name);
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#endif