1 /* $NetBSD: lstate.h,v 1.1.1.1 2010/10/31 11:16:58 mbalmer Exp $ */ 2 3 /* 4 ** Id: lstate.h,v 2.24.1.2 2008/01/03 15:20:39 roberto 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 171 172