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/*
** $Id: lparser.h,v 1.31 2001/06/05 18:17:01 roberto Exp roberto $
** LL(1) Parser and code generator for Lua
** See Copyright Notice in lua.h
*/
#ifndef lparser_h
#define lparser_h
#include "lobject.h"
#include "lzio.h"
/*
** Expression descriptor
*/
typedef enum {
VVOID, /* no value */
VNIL,
VNUMBER, /* n = value */
VK, /* info = index of constant in `k' */
VGLOBAL, /* info = index of global name in `k' */
VLOCAL, /* info = local register */
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;
union {
struct {
int info, aux;
} i;
lua_Number n;
} u;
int t; /* patch list of `exit when true' */
int f; /* patch list of `exit when false' */
} expdesc;
/* state needed to generate code for a given function */
typedef struct FuncState {
Proto *f; /* current function header */
struct FuncState *prev; /* enclosing function */
struct LexState *ls; /* lexical state */
struct lua_State *L; /* copy of the Lua state */
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 nk; /* number of elements in `k' */
int np; /* number of elements in `p' */
int nlineinfo; /* number of elements in `lineinfo' */
int nlocvars; /* number of elements in `locvars' */
int nactloc; /* number of active local variables */
int lastline; /* line where last `lineinfo' was generated */
struct Breaklabel *bl; /* chain of breakable blocks */
expdesc upvalues[MAXUPVALUES]; /* upvalues */
int actloc[MAXLOCALS]; /* local-variable stack (indices to locvars) */
} FuncState;
Proto *luaY_parser (lua_State *L, ZIO *z);
#endif
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