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/*
** $Id: ldo.h,v 1.1 1997/09/16 19:25:59 roberto Exp roberto $
** Stack and Call structure of Lua
** See Copyright Notice in lua.h
*/
#ifndef ldo_h
#define ldo_h
#include "lobject.h"
typedef int StkId; /* index to luaD_stack.stack elements */
#define MULT_RET 255
extern struct Stack {
TObject *last;
TObject *stack;
TObject *top;
} luaD_stack;
extern struct C_Lua_Stack {
StkId base; /* when Lua calls C or C calls Lua, points to */
/* the first slot after the last parameter. */
StkId lua2C; /* points to first element of "array" lua2C */
int num; /* size of "array" lua2C */
} luaD_Cstack;
extern TObject luaD_errorim;
/*
** macro to increment stack top.
** There must be always an empty slot at the luaD_stack.top
*/
#define incr_top { if (luaD_stack.top >= luaD_stack.last) luaD_checkstack(1); \
luaD_stack.top++; }
/* macros to convert from lua_Object to (TObject *) and back */
#define Address(lo) ((lo)+luaD_stack.stack-1)
#define Ref(st) ((st)-luaD_stack.stack+1)
void luaD_init (void);
void luaD_adjusttop (StkId newtop);
void luaD_openstack (int nelems);
void luaD_lineHook (int line);
void luaD_callHook (StkId base, lua_Type type, int isreturn);
void luaD_call (StkId base, int nResults);
void luaD_callTM (TObject *f, int nParams, int nResults);
int luaD_protectedrun (int nResults);
void luaD_gcIM (TObject *o);
void luaD_travstack (int (*fn)(TObject *));
void luaD_checkstack (int n);
#endif
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