| /* |
| ** $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 |
| |