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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170/*** 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 */ lu_byte gcflags; /* flags for the 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