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/*
** $Id: lparser.h,v 1.25 2000/09/29 12:42:13 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 {
VGLOBAL,
VLOCAL,
VINDEXED,
VEXP
} expkind;
typedef struct expdesc {
expkind k;
union {
int index; /* VGLOBAL: `kstr' index of global name; VLOCAL: stack index */
struct {
int t; /* patch list of `exit when true' */
int f; /* patch list of `exit when false' */
} l;
} u;
} 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 */
int lasttarget; /* `pc' of last `jump target' */
int jlt; /* list of jumps to `lasttarget' */
short stacklevel; /* number of values on activation register */
short nactloc; /* number of active local variables */
short nupvalues; /* number of upvalues */
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