FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/module/lua/lstate.h

     /*
     ** $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 <sys/lua/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;
     lu_byte runerror; /* handling a runtime error */
     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

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