external/mit/lua/dist/src/lstate.h

   1 /*      $NetBSD: lstate.h,v 1.1.1.2 2012/03/15 00:08:04 alnsn Exp $     */
   2
   3 /*
   4 ** $Id: lstate.h,v 1.1.1.2 2012/03/15 00:08:04 alnsn Exp $
   5 ** Global State
   6 ** See Copyright Notice in lua.h
   7 */
   8
   9 #ifndef lstate_h
  10 #define lstate_h
  11
  12 #include "lua.h"
  13
  14 #include "lobject.h"
  15 #include "ltm.h"
  16 #include "lzio.h"
  17
  18
  19
  20 struct lua_longjmp;  /* defined in ldo.c */
  21
  22
  23 /* table of globals */
  24 #define gt(L)   (&L->l_gt)
  25
  26 /* registry */
  27 #define registry(L)     (&G(L)->l_registry)
  28
  29
  30 /* extra stack space to handle TM calls and some other extras */
  31 #define EXTRA_STACK   5
  32
  33
  34 #define BASIC_CI_SIZE           8
  35
  36 #define BASIC_STACK_SIZE        (2*LUA_MINSTACK)
  37
  38
  39
  40 typedef struct stringtable {
  41   GCObject **hash;
  42   lu_int32 nuse;  /* number of elements */
  43   int size;
  44 } stringtable;
  45
  46
  47 /*
  48 ** informations about a call
  49 */
  50 typedef struct CallInfo {
  51   StkId base;  /* base for this function */
  52   StkId func;  /* function index in the stack */
  53   StkId top;  /* top for this function */
  54   const Instruction *savedpc;
  55   int nresults;  /* expected number of results from this function */
  56   int tailcalls;  /* number of tail calls lost under this entry */
  57 } CallInfo;
  58
  59
  60
  61 #define curr_func(L)    (clvalue(L->ci->func))
  62 #define ci_func(ci)     (clvalue((ci)->func))
  63 #define f_isLua(ci)     (!ci_func(ci)->c.isC)
  64 #define isLua(ci)       (ttisfunction((ci)->func) && f_isLua(ci))
  65
  66
  67 /*
  68 ** `global state', shared by all threads of this state
  69 */
  70 typedef struct global_State {
  71   stringtable strt;  /* hash table for strings */
  72   lua_Alloc frealloc;  /* function to reallocate memory */
  73   void *ud;         /* auxiliary data to `frealloc' */
  74   lu_byte currentwhite;
  75   lu_byte gcstate;  /* state of garbage collector */
  76   int sweepstrgc;  /* position of sweep in `strt' */
  77   GCObject *rootgc;  /* list of all collectable objects */
  78   GCObject **sweepgc;  /* position of sweep in `rootgc' */
  79   GCObject *gray;  /* list of gray objects */
  80   GCObject *grayagain;  /* list of objects to be traversed atomically */
  81   GCObject *weak;  /* list of weak tables (to be cleared) */
  82   GCObject *tmudata;  /* last element of list of userdata to be GC */
  83   Mbuffer buff;  /* temporary buffer for string concatentation */
  84   lu_mem GCthreshold;
  85   lu_mem totalbytes;  /* number of bytes currently allocated */
  86   lu_mem estimate;  /* an estimate of number of bytes actually in use */
  87   lu_mem gcdept;  /* how much GC is `behind schedule' */
  88   int gcpause;  /* size of pause between successive GCs */
  89   int gcstepmul;  /* GC `granularity' */
  90   lua_CFunction panic;  /* to be called in unprotected errors */
  91   TValue l_registry;
  92   struct lua_State *mainthread;
  93   UpVal uvhead;  /* head of double-linked list of all open upvalues */
  94   struct Table *mt[NUM_TAGS];  /* metatables for basic types */
  95   TString *tmname[TM_N];  /* array with tag-method names */
  96 } global_State;
  97
  98
  99 /*
 100 ** `per thread' state
 101 */
 102 struct lua_State {
 103   CommonHeader;
 104   lu_byte status;
 105   StkId top;  /* first free slot in the stack */
 106   StkId base;  /* base of current function */
 107   global_State *l_G;
 108   CallInfo *ci;  /* call info for current function */
 109   const Instruction *savedpc;  /* `savedpc' of current function */
 110   StkId stack_last;  /* last free slot in the stack */
 111   StkId stack;  /* stack base */
 112   CallInfo *end_ci;  /* points after end of ci array*/
 113   CallInfo *base_ci;  /* array of CallInfo's */
 114   int stacksize;
 115   int size_ci;  /* size of array `base_ci' */
 116   unsigned short nCcalls;  /* number of nested C calls */
 117   unsigned short baseCcalls;  /* nested C calls when resuming coroutine */
 118   lu_byte hookmask;
 119   lu_byte allowhook;
 120   int basehookcount;
 121   int hookcount;
 122   lua_Hook hook;
 123   TValue l_gt;  /* table of globals */
 124   TValue env;  /* temporary place for environments */
 125   GCObject *openupval;  /* list of open upvalues in this stack */
 126   GCObject *gclist;
 127   struct lua_longjmp *errorJmp;  /* current error recover point */
 128   ptrdiff_t errfunc;  /* current error handling function (stack index) */
 129 };
 130
 131
 132 #define G(L)    (L->l_G)
 133
 134
 135 /*
 136 ** Union of all collectable objects
 137 */
 138 union GCObject {
 139   GCheader gch;
 140   union TString ts;
 141   union Udata u;
 142   union Closure cl;
 143   struct Table h;
 144   struct Proto p;
 145   struct UpVal uv;
 146   struct lua_State th;  /* thread */
 147 };
 148
 149
 150 /* macros to convert a GCObject into a specific value */
 151 #define rawgco2ts(o)    check_exp((o)->gch.tt == LUA_TSTRING, &((o)->ts))
 152 #define gco2ts(o)       (&rawgco2ts(o)->tsv)
 153 #define rawgco2u(o)     check_exp((o)->gch.tt == LUA_TUSERDATA, &((o)->u))
 154 #define gco2u(o)        (&rawgco2u(o)->uv)
 155 #define gco2cl(o)       check_exp((o)->gch.tt == LUA_TFUNCTION, &((o)->cl))
 156 #define gco2h(o)        check_exp((o)->gch.tt == LUA_TTABLE, &((o)->h))
 157 #define gco2p(o)        check_exp((o)->gch.tt == LUA_TPROTO, &((o)->p))
 158 #define gco2uv(o)       check_exp((o)->gch.tt == LUA_TUPVAL, &((o)->uv))
 159 #define ngcotouv(o) \
 160         check_exp((o) == NULL || (o)->gch.tt == LUA_TUPVAL, &((o)->uv))
 161 #define gco2th(o)       check_exp((o)->gch.tt == LUA_TTHREAD, &((o)->th))
 162
 163 /* macro to convert any Lua object into a GCObject */
 164 #define obj2gco(v)      (cast(GCObject *, (v)))
 165
 166
 167 LUAI_FUNC lua_State *luaE_newthread (lua_State *L);
 168 LUAI_FUNC void luaE_freethread (lua_State *L, lua_State *L1);
 169
 170 #endif
 171