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