| /* |
| ** $Id: lstate.h,v 2.82 2012/07/02 13:37:04 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" |
| |
| |
| /* |
| |
| ** 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 |