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/*
** $Id: lparser.h,v 1.5 1999/11/22 13:12:07 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 "lopcodes.h"
#include "lzio.h"
/* maximum number of local variables */
#ifndef MAXLOCALS
#define MAXLOCALS 200 /* arbitrary limit (<=MAXARG_B) */
#endif
/* maximum number of upvalues */
#ifndef MAXUPVALUES
#define MAXUPVALUES 32 /* arbitrary limit (<=MAXARG_B) */
#endif
/* maximum number of variables in the left side of an assignment */
#ifndef MAXVARSLH
#define MAXVARSLH 100 /* arbitrary limit (<=MAXARG_B) */
#endif
/* maximum number of parameters in a function */
#ifndef MAXPARAMS
#define MAXPARAMS 100 /* arbitrary limit (<=MAXLOCALS) */
#endif
/* maximum stack size in a function */
#ifndef MAXSTACK
#define MAXSTACK 256 /* arbitrary limit (<=MAXARG_A) */
#endif
#if MAXLOCALS>MAXARG_U || MAXUPVALUES>MAXARG_B || MAXVARSLH>MAXARG_B || \
MAXPARAMS>MAXLOCALS || MAXSTACK>MAXARG_A || LFIELDS_PER_FLUSH>MAXARG_B
#error invalid limits
#endif
/*
** Variable descriptor:
** must include an `exp' option because LL(1) cannot distinguish
** between variables, upvalues and function calls on first sight.
*/
typedef enum {
VGLOBAL, /* info is constant index of global name */
VLOCAL, /* info is stack index */
VINDEXED, /* no info (table and index are on the stack) */
VEXP /* info is pc index of a call (or 0 if exp is closed) */
} varkind;
typedef struct vardesc {
varkind k;
int info;
} vardesc;
/* state needed to generate code for a given function */
typedef struct FuncState {
TProtoFunc *f; /* current function header */
struct FuncState *prev; /* enclosing function */
int pc; /* next position to code */
int last_pc; /* last instruction coded (for optimizations) */
int stacksize; /* number of values on activation register */
int nlocalvar; /* number of active local variables */
int nupvalues; /* number of upvalues */
int nvars; /* number of entries in f->locvars (-1 if no debug information) */
int lastsetline; /* line where last SETLINE was issued */
vardesc upvalues[MAXUPVALUES]; /* upvalues */
TaggedString *localvar[MAXLOCALS]; /* store local variable names */
} FuncState;
TProtoFunc *luaY_parser (lua_State *L, ZIO *z);
#endif
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