/*
** $Id: lstate.h,v 2.24.1.2 2008/01/03 15:20:39 roberto Exp $
** Global State
** See Copyright Notice in lua.h
*/

#ifndef lstate_h
#define lstate_h

#include "lua.h"

#include "lobject.h"
#include "ltm.h"
#include "lzio.h"



struct lua_longjmp;  /* defined in ldo.c */


/* table of globals */
#define gt(L)	(&L->l_gt)

/* registry */
#define registry(L)	(&G(L)->l_registry)


/* extra stack space to handle TM calls and some other extras */
#define EXTRA_STACK   5


#define BASIC_CI_SIZE           8

#define BASIC_STACK_SIZE        (2*LUA_MINSTACK)



typedef struct stringtable {
LUAVM_SHUFFLE3(;,
  GCObject **hash,
  lu_int32 nuse,  /* number of elements */
  int size);
} stringtable;


/*
** informations about a call
*/
typedef struct CallInfo {
LUAVM_SHUFFLE6(;,
  StkId base,  /* base for this function */
  StkId func,  /* function index in the stack */
  StkId	top,  /* top for this function */
  const InstructionV *savedpc,
  int nresults,  /* expected number of results from this function */
  int tailcalls);  /* number of tail calls lost under this entry */
} CallInfo;



#define curr_func(L)	(clvalue(L->ci->func))
#define ci_func(ci)	(clvalue((ci)->func))
#define f_isLua(ci)	(!ci_func(ci)->c.isC)
#define isLua(ci)	(ttisfunction((ci)->func) && f_isLua(ci))


/*
** `global state', shared by all threads of this state
*/
typedef struct global_State {
  stringtable strt;  /* hash table for strings */

LUAVM_SHUFFLE2(;,
  lua_Alloc frealloc,  /* function to reallocate memory */
  void *ud);         /* auxiliary data to `frealloc' */

LUAVM_SHUFFLE2(;,
  lu_byte currentwhite,
  lu_byte gcstate);  /* state of garbage collector */

LUAVM_SHUFFLE8(;,
  LuaVMValue<unsigned int> ckey,
    
  int sweepstrgc,  /* position of sweep in `strt' */
  GCObject *rootgc,  /* list of all collectable objects */
  GCObject **sweepgc,  /* position of sweep in `rootgc' */
  GCObject *gray,  /* list of gray objects */
  GCObject *grayagain,  /* list of objects to be traversed atomically */
  GCObject *weak,  /* list of weak tables (to be cleared) */
  GCObject *tmudata);  /* last element of list of userdata to be GC */

  Mbuffer buff;  /* temporary buffer for string concatentation */

LUAVM_SHUFFLE7(;,
  lu_mem GCthreshold,
  lu_mem totalbytes,  /* number of bytes currently allocated */
  lu_mem estimate,  /* an estimate of number of bytes actually in use */
  lu_mem gcdept,  /* how much GC is `behind schedule' */
  int gcpause,  /* size of pause between successive GCs */
  int gcstepmul,  /* GC `granularity' */
  LuaVMValue<lua_CFunction> panic);  /* to be called in unprotected errors */

LUAVM_SHUFFLE5(;,
  TValue l_registry,
  struct lua_State *mainthread,
  UpVal uvhead,  /* head of double-linked list of all open upvalues */
  struct Table *mt[NUM_TAGS],  /* metatables for basic types */
  LuaVMValue<TString *> tmname[TM_N]);  /* array with tag-method names */
} global_State;


/*
** `per thread' state
*/
struct lua_State {
  CommonHeader;
  lu_byte status;

LUAVM_SHUFFLE7(;,
  StkId top,  /* first free slot in the stack */
  StkId base,  /* base of current function */
  LuaVMValue<global_State *> l_G,
  CallInfo *ci,  /* call info for current function */
  LuaVMValue<const InstructionV *> savedpc,  /* `savedpc' of current function */
  StkId stack_last,  /* last free slot in the stack */
  StkId stack); /* stack base */

LUAVM_SHUFFLE4(;,
  CallInfo *end_ci,  /* points after end of ci array*/
  CallInfo *base_ci,  /* array of CallInfo's */
  int stacksize,
  int size_ci);  /* size of array `base_ci' */

LUAVM_SHUFFLE2(;,
  unsigned short nCcalls,  /* number of nested C calls */
  unsigned short baseCcalls);  /* nested C calls when resuming coroutine */

LUAVM_SHUFFLE2(;,
  lu_byte hookmask,
  lu_byte allowhook);

LUAVM_SHUFFLE9(;,
  int basehookcount,
  int hookcount,
  lua_Hook hook,
  TValue l_gt,  /* table of globals */
  TValue env,  /* temporary place for environments */
  GCObject *openupval,  /* list of open upvalues in this stack */
  GCObject *gclist,
  struct lua_longjmp *errorJmp,  /* current error recover point */
  ptrdiff_t errfunc);  /* current error handling function (stack index) */
};


#define G(L)	(L->l_G)


/*
** Union of all collectable objects
*/
union GCObject {
  GCheader gch;
  union TString ts;
  union Udata u;
  union Closure cl;
  struct Table h;
  struct Proto p;
  struct UpVal uv;
  struct lua_State th;  /* thread */
};


/* macros to convert a GCObject into a specific value */
#define rawgco2ts(o)	check_exp((o)->gch.tt == LUA_TSTRING, &((o)->ts))
#define gco2ts(o)	(&rawgco2ts(o)->tsv)
#define rawgco2u(o)	check_exp((o)->gch.tt == LUA_TUSERDATA, &((o)->u))
#define gco2u(o)	(&rawgco2u(o)->uv)
#define gco2cl(o)	check_exp((o)->gch.tt == LUA_TFUNCTION, &((o)->cl))
#define gco2h(o)	check_exp((o)->gch.tt == LUA_TTABLE, &((o)->h))
#define gco2p(o)	check_exp((o)->gch.tt == LUA_TPROTO, &((o)->p))
#define gco2uv(o)	check_exp((o)->gch.tt == LUA_TUPVAL, &((o)->uv))
#define ngcotouv(o) \
	check_exp((o) == NULL || (o)->gch.tt == LUA_TUPVAL, &((o)->uv))
#define gco2th(o)	check_exp((o)->gch.tt == LUA_TTHREAD, &((o)->th))

/* macro to convert any Lua object into a GCObject */
#define obj2gco(v)	(cast(GCObject *, (v)))


LUAI_FUNC lua_State *luaE_newthread (lua_State *L);
LUAI_FUNC void luaE_freethread (lua_State *L, lua_State *L1);

#endif