/* BEGIN CSTYLED */ /* ** $Id: lstate.h,v 2.82.1.1 2013/04/12 18:48:47 roberto Exp $ ** Global State ** See Copyright Notice in lua.h */ #ifndef lstate_h #define lstate_h #include #include "lobject.h" #include "ltm.h" #include "lzio.h" /* ** Some notes about garbage-collected objects: All objects in Lua must ** be kept somehow accessible until being freed. ** ** Lua keeps most objects linked in list g->allgc. The link uses field ** 'next' of the CommonHeader. ** ** Strings are kept in several lists headed by the array g->strt.hash. ** ** Open upvalues are not subject to independent garbage collection. They ** are collected together with their respective threads. Lua keeps a ** double-linked list with all open upvalues (g->uvhead) so that it can ** mark objects referred by them. (They are always gray, so they must ** be remarked in the atomic step. Usually their contents would be marked ** when traversing the respective threads, but the thread may already be ** dead, while the upvalue is still accessible through closures.) ** ** Objects with finalizers are kept in the list g->finobj. ** ** The list g->tobefnz links all objects being finalized. */ struct lua_longjmp; /* defined in ldo.c */ /* extra stack space to handle TM calls and some other extras */ #define EXTRA_STACK 5 #define BASIC_STACK_SIZE (2*LUA_MINSTACK) /* kinds of Garbage Collection */ #define KGC_NORMAL 0 #define KGC_EMERGENCY 1 /* gc was forced by an allocation failure */ #define KGC_GEN 2 /* generational collection */ typedef struct stringtable { GCObject **hash; lu_int32 nuse; /* number of elements */ int size; } stringtable; /* ** information about a call */ typedef struct CallInfo { StkId func; /* function index in the stack */ StkId top; /* top for this function */ struct CallInfo *previous, *next; /* dynamic call link */ short nresults; /* expected number of results from this function */ lu_byte callstatus; ptrdiff_t extra; union { struct { /* only for Lua functions */ StkId base; /* base for this function */ const Instruction *savedpc; } l; struct { /* only for C functions */ int ctx; /* context info. in case of yields */ lua_CFunction k; /* continuation in case of yields */ ptrdiff_t old_errfunc; lu_byte old_allowhook; lu_byte status; } c; } u; } CallInfo; /* ** Bits in CallInfo status */ #define CIST_LUA (1<<0) /* call is running a Lua function */ #define CIST_HOOKED (1<<1) /* call is running a debug hook */ #define CIST_REENTRY (1<<2) /* call is running on same invocation of luaV_execute of previous call */ #define CIST_YIELDED (1<<3) /* call reentered after suspension */ #define CIST_YPCALL (1<<4) /* call is a yieldable protected call */ #define CIST_STAT (1<<5) /* call has an error status (pcall) */ #define CIST_TAIL (1<<6) /* call was tail called */ #define CIST_HOOKYIELD (1<<7) /* last hook called yielded */ #define isLua(ci) ((ci)->callstatus & CIST_LUA) /* ** `global state', shared by all threads of this state */ typedef struct global_State { lua_Alloc frealloc; /* function to reallocate memory */ void *ud; /* auxiliary data to `frealloc' */ lu_mem totalbytes; /* number of bytes currently allocated - GCdebt */ l_mem GCdebt; /* bytes allocated not yet compensated by the collector */ lu_mem GCmemtrav; /* memory traversed by the GC */ lu_mem GCestimate; /* an estimate of the non-garbage memory in use */ stringtable strt; /* hash table for strings */ TValue l_registry; unsigned int seed; /* randomized seed for hashes */ lu_byte currentwhite; lu_byte gcstate; /* state of garbage collector */ lu_byte gckind; /* kind of GC running */ lu_byte gcrunning; /* true if GC is running */ int sweepstrgc; /* position of sweep in `strt' */ GCObject *allgc; /* list of all collectable objects */ GCObject *finobj; /* list of collectable objects with finalizers */ GCObject **sweepgc; /* current position of sweep in list 'allgc' */ GCObject **sweepfin; /* current position of sweep in list 'finobj' */ GCObject *gray; /* list of gray objects */ GCObject *grayagain; /* list of objects to be traversed atomically */ GCObject *weak; /* list of tables with weak values */ GCObject *ephemeron; /* list of ephemeron tables (weak keys) */ GCObject *allweak; /* list of all-weak tables */ GCObject *tobefnz; /* list of userdata to be GC */ UpVal uvhead; /* head of double-linked list of all open upvalues */ Mbuffer buff; /* temporary buffer for string concatenation */ int gcpause; /* size of pause between successive GCs */ int gcmajorinc; /* pause between major collections (only in gen. mode) */ int gcstepmul; /* GC `granularity' */ lua_CFunction panic; /* to be called in unprotected errors */ struct lua_State *mainthread; const lua_Number *version; /* pointer to version number */ TString *memerrmsg; /* memory-error message */ TString *tmname[TM_N]; /* array with tag-method names */ struct Table *mt[LUA_NUMTAGS]; /* metatables for basic types */ } global_State; /* ** `per thread' state */ struct lua_State { CommonHeader; lu_byte status; StkId top; /* first free slot in the stack */ global_State *l_G; CallInfo *ci; /* call info for current function */ const Instruction *oldpc; /* last pc traced */ StkId stack_last; /* last free slot in the stack */ StkId stack; /* stack base */ int stacksize; unsigned short nny; /* number of non-yieldable calls in stack */ unsigned short nCcalls; /* number of nested C calls */ lu_byte hookmask; lu_byte allowhook; int basehookcount; int hookcount; lua_Hook hook; 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) */ CallInfo base_ci; /* CallInfo for first level (C calling Lua) */ }; #define G(L) (L->l_G) /* ** Union of all collectable objects */ union GCObject { GCheader gch; /* common header */ union TString ts; union Udata u; union Closure cl; struct Table h; struct Proto p; struct UpVal uv; struct lua_State th; /* thread */ }; #define gch(o) (&(o)->gch) /* macros to convert a GCObject into a specific value */ #define rawgco2ts(o) \ check_exp(novariant((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 gco2lcl(o) check_exp((o)->gch.tt == LUA_TLCL, &((o)->cl.l)) #define gco2ccl(o) check_exp((o)->gch.tt == LUA_TCCL, &((o)->cl.c)) #define gco2cl(o) \ check_exp(novariant((o)->gch.tt) == LUA_TFUNCTION, &((o)->cl)) #define gco2t(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 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))) /* actual number of total bytes allocated */ #define gettotalbytes(g) ((g)->totalbytes + (g)->GCdebt) LUAI_FUNC void luaE_setdebt (global_State *g, l_mem debt); LUAI_FUNC void luaE_freethread (lua_State *L, lua_State *L1); LUAI_FUNC CallInfo *luaE_extendCI (lua_State *L); LUAI_FUNC void luaE_freeCI (lua_State *L); #endif /* END CSTYLED */