rlm@1: /*
rlm@1: ** $Id: lstate.h,v 2.24.1.2 2008/01/03 15:20:39 roberto Exp $
rlm@1: ** Global State
rlm@1: ** See Copyright Notice in lua.h
rlm@1: */
rlm@1: 
rlm@1: #ifndef lstate_h
rlm@1: #define lstate_h
rlm@1: 
rlm@1: #include "lua.h"
rlm@1: 
rlm@1: #include "lobject.h"
rlm@1: #include "ltm.h"
rlm@1: #include "lzio.h"
rlm@1: 
rlm@1: 
rlm@1: 
rlm@1: struct lua_longjmp;  /* defined in ldo.c */
rlm@1: 
rlm@1: 
rlm@1: /* table of globals */
rlm@1: #define gt(L)	(&L->l_gt)
rlm@1: 
rlm@1: /* registry */
rlm@1: #define registry(L)	(&G(L)->l_registry)
rlm@1: 
rlm@1: 
rlm@1: /* extra stack space to handle TM calls and some other extras */
rlm@1: #define EXTRA_STACK   5
rlm@1: 
rlm@1: 
rlm@1: #define BASIC_CI_SIZE           8
rlm@1: 
rlm@1: #define BASIC_STACK_SIZE        (2*LUA_MINSTACK)
rlm@1: 
rlm@1: 
rlm@1: 
rlm@1: typedef struct stringtable {
rlm@1:   GCObject **hash;
rlm@1:   lu_int32 nuse;  /* number of elements */
rlm@1:   int size;
rlm@1: } stringtable;
rlm@1: 
rlm@1: 
rlm@1: /*
rlm@1: ** informations about a call
rlm@1: */
rlm@1: typedef struct CallInfo {
rlm@1:   StkId base;  /* base for this function */
rlm@1:   StkId func;  /* function index in the stack */
rlm@1:   StkId	top;  /* top for this function */
rlm@1:   const Instruction *savedpc;
rlm@1:   int nresults;  /* expected number of results from this function */
rlm@1:   int tailcalls;  /* number of tail calls lost under this entry */
rlm@1: } CallInfo;
rlm@1: 
rlm@1: 
rlm@1: 
rlm@1: #define curr_func(L)	(clvalue(L->ci->func))
rlm@1: #define ci_func(ci)	(clvalue((ci)->func))
rlm@1: #define f_isLua(ci)	(!ci_func(ci)->c.isC)
rlm@1: #define isLua(ci)	(ttisfunction((ci)->func) && f_isLua(ci))
rlm@1: 
rlm@1: 
rlm@1: /*
rlm@1: ** `global state', shared by all threads of this state
rlm@1: */
rlm@1: typedef struct global_State {
rlm@1:   stringtable strt;  /* hash table for strings */
rlm@1:   lua_Alloc frealloc;  /* function to reallocate memory */
rlm@1:   void *ud;         /* auxiliary data to `frealloc' */
rlm@1:   lu_byte currentwhite;
rlm@1:   lu_byte gcstate;  /* state of garbage collector */
rlm@1:   int sweepstrgc;  /* position of sweep in `strt' */
rlm@1:   GCObject *rootgc;  /* list of all collectable objects */
rlm@1:   GCObject **sweepgc;  /* position of sweep in `rootgc' */
rlm@1:   GCObject *gray;  /* list of gray objects */
rlm@1:   GCObject *grayagain;  /* list of objects to be traversed atomically */
rlm@1:   GCObject *weak;  /* list of weak tables (to be cleared) */
rlm@1:   GCObject *tmudata;  /* last element of list of userdata to be GC */
rlm@1:   Mbuffer buff;  /* temporary buffer for string concatentation */
rlm@1:   lu_mem GCthreshold;
rlm@1:   lu_mem totalbytes;  /* number of bytes currently allocated */
rlm@1:   lu_mem estimate;  /* an estimate of number of bytes actually in use */
rlm@1:   lu_mem gcdept;  /* how much GC is `behind schedule' */
rlm@1:   int gcpause;  /* size of pause between successive GCs */
rlm@1:   int gcstepmul;  /* GC `granularity' */
rlm@1:   lua_CFunction panic;  /* to be called in unprotected errors */
rlm@1:   TValue l_registry;
rlm@1:   struct lua_State *mainthread;
rlm@1:   UpVal uvhead;  /* head of double-linked list of all open upvalues */
rlm@1:   struct Table *mt[NUM_TAGS];  /* metatables for basic types */
rlm@1:   TString *tmname[TM_N];  /* array with tag-method names */
rlm@1: } global_State;
rlm@1: 
rlm@1: 
rlm@1: /*
rlm@1: ** `per thread' state
rlm@1: */
rlm@1: struct lua_State {
rlm@1:   CommonHeader;
rlm@1:   lu_byte status;
rlm@1:   StkId top;  /* first free slot in the stack */
rlm@1:   StkId base;  /* base of current function */
rlm@1:   global_State *l_G;
rlm@1:   CallInfo *ci;  /* call info for current function */
rlm@1:   const Instruction *savedpc;  /* `savedpc' of current function */
rlm@1:   StkId stack_last;  /* last free slot in the stack */
rlm@1:   StkId stack;  /* stack base */
rlm@1:   CallInfo *end_ci;  /* points after end of ci array*/
rlm@1:   CallInfo *base_ci;  /* array of CallInfo's */
rlm@1:   int stacksize;
rlm@1:   int size_ci;  /* size of array `base_ci' */
rlm@1:   unsigned short nCcalls;  /* number of nested C calls */
rlm@1:   unsigned short baseCcalls;  /* nested C calls when resuming coroutine */
rlm@1:   lu_byte hookmask;
rlm@1:   lu_byte allowhook;
rlm@1:   int basehookcount;
rlm@1:   int hookcount;
rlm@1:   lua_Hook hook;
rlm@1:   TValue l_gt;  /* table of globals */
rlm@1:   TValue env;  /* temporary place for environments */
rlm@1:   GCObject *openupval;  /* list of open upvalues in this stack */
rlm@1:   GCObject *gclist;
rlm@1:   struct lua_longjmp *errorJmp;  /* current error recover point */
rlm@1:   ptrdiff_t errfunc;  /* current error handling function (stack index) */
rlm@1: };
rlm@1: 
rlm@1: 
rlm@1: #define G(L)	(L->l_G)
rlm@1: 
rlm@1: 
rlm@1: /*
rlm@1: ** Union of all collectable objects
rlm@1: */
rlm@1: union GCObject {
rlm@1:   GCheader gch;
rlm@1:   union TString ts;
rlm@1:   union Udata u;
rlm@1:   union Closure cl;
rlm@1:   struct Table h;
rlm@1:   struct Proto p;
rlm@1:   struct UpVal uv;
rlm@1:   struct lua_State th;  /* thread */
rlm@1: };
rlm@1: 
rlm@1: 
rlm@1: /* macros to convert a GCObject into a specific value */
rlm@1: #define rawgco2ts(o)	check_exp((o)->gch.tt == LUA_TSTRING, &((o)->ts))
rlm@1: #define gco2ts(o)	(&rawgco2ts(o)->tsv)
rlm@1: #define rawgco2u(o)	check_exp((o)->gch.tt == LUA_TUSERDATA, &((o)->u))
rlm@1: #define gco2u(o)	(&rawgco2u(o)->uv)
rlm@1: #define gco2cl(o)	check_exp((o)->gch.tt == LUA_TFUNCTION, &((o)->cl))
rlm@1: #define gco2h(o)	check_exp((o)->gch.tt == LUA_TTABLE, &((o)->h))
rlm@1: #define gco2p(o)	check_exp((o)->gch.tt == LUA_TPROTO, &((o)->p))
rlm@1: #define gco2uv(o)	check_exp((o)->gch.tt == LUA_TUPVAL, &((o)->uv))
rlm@1: #define ngcotouv(o) \
rlm@1: 	check_exp((o) == NULL || (o)->gch.tt == LUA_TUPVAL, &((o)->uv))
rlm@1: #define gco2th(o)	check_exp((o)->gch.tt == LUA_TTHREAD, &((o)->th))
rlm@1: 
rlm@1: /* macro to convert any Lua object into a GCObject */
rlm@1: #define obj2gco(v)	(cast(GCObject *, (v)))
rlm@1: 
rlm@1: 
rlm@1: LUAI_FUNC lua_State *luaE_newthread (lua_State *L);
rlm@1: LUAI_FUNC void luaE_freethread (lua_State *L, lua_State *L1);
rlm@1: 
rlm@1: #endif
rlm@1: