/*

 ** $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 {

   GCObject **hash;

   lu_int32 nuse;  /* number of elements */

   int size;

 } stringtable;

 

 

 /*

 ** informations about a call

 */

 typedef struct CallInfo {

   StkId base;  /* base for this function */

   StkId func;  /* function index in the stack */

   StkId	top;  /* top for this function */

   const Instruction *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 */

   lua_Alloc frealloc;  /* function to reallocate memory */

   void *ud;         /* auxiliary data to `frealloc' */

   lu_byte currentwhite;

   lu_byte gcstate;  /* state of garbage collector */

   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 */

   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' */

   lua_CFunction panic;  /* to be called in unprotected errors */

   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 */

   TString *tmname[TM_N];  /* array with tag-method names */

 } global_State;

 

 

 /*

 ** `per thread' state

 */

 struct lua_State {

   CommonHeader;

   lu_byte status;

   StkId top;  /* first free slot in the stack */

   StkId base;  /* base of current function */

   global_State *l_G;

   CallInfo *ci;  /* call info for current function */

   const Instruction *savedpc;  /* `savedpc' of current function */

   StkId stack_last;  /* last free slot in the stack */

   StkId stack;  /* stack base */

   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' */

   unsigned short nCcalls;  /* number of nested C calls */

   unsigned short baseCcalls;  /* nested C calls when resuming coroutine */

   lu_byte hookmask;

   lu_byte allowhook;

   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