mirror of
https://github.com/lua/lua
synced 2024-11-26 06:39:41 +03:00
83 lines
2.3 KiB
C
83 lines
2.3 KiB
C
/*
|
|
** $Id: lparser.h,v 1.40 2002/03/14 18:01:52 roberto Exp roberto $
|
|
** Lua Parser
|
|
** See Copyright Notice in lua.h
|
|
*/
|
|
|
|
#ifndef lparser_h
|
|
#define lparser_h
|
|
|
|
#include "llimits.h"
|
|
#include "lobject.h"
|
|
#include "ltable.h"
|
|
#include "lzio.h"
|
|
|
|
|
|
/*
|
|
** Expression descriptor
|
|
*/
|
|
|
|
typedef enum {
|
|
VVOID, /* no value */
|
|
VNIL,
|
|
VTRUE,
|
|
VFALSE,
|
|
VK, /* info = index of constant in `k' */
|
|
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') */
|
|
VRELOCABLE, /* info = instruction pc */
|
|
VNONRELOC, /* info = result register */
|
|
VJMP, /* info = result register */
|
|
VCALL /* info = result register */
|
|
} expkind;
|
|
|
|
typedef struct expdesc {
|
|
expkind k;
|
|
int info, aux;
|
|
int t; /* patch list of `exit when true' */
|
|
int f; /* patch list of `exit when false' */
|
|
} expdesc;
|
|
|
|
|
|
/* describe declared variables */
|
|
typedef struct vardesc {
|
|
int i; /* if local, its index in `locvars';
|
|
if global, its name index in `k' */
|
|
lu_byte k;
|
|
lu_byte level; /* if local, stack level;
|
|
if global, corresponding local (NO_REG for free globals) */
|
|
} vardesc;
|
|
|
|
|
|
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 jlt; /* list of jumps to `lasttarget' */
|
|
int freereg; /* first free register */
|
|
int defaultglob; /* where to look for non-declared globals */
|
|
int nk; /* number of elements in `k' */
|
|
int np; /* number of elements in `p' */
|
|
int nlocvars; /* number of elements in `locvars' */
|
|
int nactloc; /* number of active local variables */
|
|
int nactvar; /* number of elements in array `actvar' */
|
|
expdesc upvalues[MAXUPVALUES]; /* upvalues */
|
|
vardesc actvar[MAXVARS]; /* declared-variable stack */
|
|
} FuncState;
|
|
|
|
|
|
Proto *luaY_parser (lua_State *L, ZIO *z);
|
|
|
|
|
|
#endif
|