| commit | author | age | ||
| 6e1425 | 1 | /* |
| H | 2 | ** $Id: lstate.h,v 2.24.1.2 2008/01/03 15:20:39 roberto Exp $ |
| 3 | ** Global State | |
| 4 | ** See Copyright Notice in lua.h | |
| 5 | */ | |
| 6 | ||
| 7 | #ifndef lstate_h | |
| 8 | #define lstate_h | |
| 9 | ||
| 10 | #include "lua.h" | |
| 11 | ||
| 12 | #include "lobject.h" | |
| 13 | #include "ltm.h" | |
| 14 | #include "lzio.h" | |
| 15 | ||
| 16 | ||
| 17 | ||
| 18 | struct lua_longjmp; /* defined in ldo.c */ | |
| 19 | ||
| 20 | ||
| 21 | /* table of globals */ | |
| 22 | #define gt(L) (&L->l_gt) | |
| 23 | ||
| 24 | /* registry */ | |
| 25 | #define registry(L) (&G(L)->l_registry) | |
| 26 | ||
| 27 | ||
| 28 | /* extra stack space to handle TM calls and some other extras */ | |
| 29 | #define EXTRA_STACK 5 | |
| 30 | ||
| 31 | ||
| 32 | #define BASIC_CI_SIZE 8 | |
| 33 | ||
| 34 | #define BASIC_STACK_SIZE (2*LUA_MINSTACK) | |
| 35 | ||
| 36 | ||
| 37 | ||
| 38 | typedef struct stringtable { | |
| 39 | GCObject **hash; | |
| 40 | lu_int32 nuse; /* number of elements */ | |
| 41 | int size; | |
| 42 | } stringtable; | |
| 43 | ||
| 44 | ||
| 45 | /* | |
| 46 | ** informations about a call | |
| 47 | */ | |
| 48 | typedef struct CallInfo { | |
| 49 | StkId base; /* base for this function */ | |
| 50 | StkId func; /* function index in the stack */ | |
| 51 | StkId top; /* top for this function */ | |
| 52 | const Instruction *savedpc; | |
| 53 | int nresults; /* expected number of results from this function */ | |
| 54 | int tailcalls; /* number of tail calls lost under this entry */ | |
| 55 | } CallInfo; | |
| 56 | ||
| 57 | ||
| 58 | ||
| 59 | #define curr_func(L) (clvalue(L->ci->func)) | |
| 60 | #define ci_func(ci) (clvalue((ci)->func)) | |
| 61 | #define f_isLua(ci) (!ci_func(ci)->c.isC) | |
| 62 | #define isLua(ci) (ttisfunction((ci)->func) && f_isLua(ci)) | |
| 63 | ||
| 64 | ||
| 65 | /* | |
| 66 | ** `global state', shared by all threads of this state | |
| 67 | */ | |
| 68 | typedef struct global_State { | |
| 69 | stringtable strt; /* hash table for strings */ | |
| 70 | lua_Alloc frealloc; /* function to reallocate memory */ | |
| 71 | void *ud; /* auxiliary data to `frealloc' */ | |
| 72 | lu_byte currentwhite; | |
| 73 | lu_byte gcstate; /* state of garbage collector */ | |
| 74 | int sweepstrgc; /* position of sweep in `strt' */ | |
| 75 | GCObject *rootgc; /* list of all collectable objects */ | |
| 76 | GCObject **sweepgc; /* position of sweep in `rootgc' */ | |
| 77 | GCObject *gray; /* list of gray objects */ | |
| 78 | GCObject *grayagain; /* list of objects to be traversed atomically */ | |
| 79 | GCObject *weak; /* list of weak tables (to be cleared) */ | |
| 80 | GCObject *tmudata; /* last element of list of userdata to be GC */ | |
| 81 | Mbuffer buff; /* temporary buffer for string concatentation */ | |
| 82 | lu_mem GCthreshold; | |
| 83 | lu_mem totalbytes; /* number of bytes currently allocated */ | |
| 84 | lu_mem estimate; /* an estimate of number of bytes actually in use */ | |
| 85 | lu_mem gcdept; /* how much GC is `behind schedule' */ | |
| 86 | int gcpause; /* size of pause between successive GCs */ | |
| 87 | int gcstepmul; /* GC `granularity' */ | |
| 88 | lua_CFunction panic; /* to be called in unprotected errors */ | |
| 89 | TValue l_registry; | |
| 90 | struct lua_State *mainthread; | |
| 91 | UpVal uvhead; /* head of double-linked list of all open upvalues */ | |
| 92 | struct Table *mt[NUM_TAGS]; /* metatables for basic types */ | |
| 93 | TString *tmname[TM_N]; /* array with tag-method names */ | |
| 94 | } global_State; | |
| 95 | ||
| 96 | ||
| 97 | /* | |
| 98 | ** `per thread' state | |
| 99 | */ | |
| 100 | struct lua_State { | |
| 101 | CommonHeader; | |
| 102 | lu_byte status; | |
| 103 | StkId top; /* first free slot in the stack */ | |
| 104 | StkId base; /* base of current function */ | |
| 105 | global_State *l_G; | |
| 106 | CallInfo *ci; /* call info for current function */ | |
| 107 | const Instruction *savedpc; /* `savedpc' of current function */ | |
| 108 | StkId stack_last; /* last free slot in the stack */ | |
| 109 | StkId stack; /* stack base */ | |
| 110 | CallInfo *end_ci; /* points after end of ci array*/ | |
| 111 | CallInfo *base_ci; /* array of CallInfo's */ | |
| 112 | int stacksize; | |
| 113 | int size_ci; /* size of array `base_ci' */ | |
| 114 | unsigned short nCcalls; /* number of nested C calls */ | |
| 115 | unsigned short baseCcalls; /* nested C calls when resuming coroutine */ | |
| 116 | lu_byte hookmask; | |
| 117 | lu_byte allowhook; | |
| 118 | int basehookcount; | |
| 119 | int hookcount; | |
| 120 | lua_Hook hook; | |
| 121 | TValue l_gt; /* table of globals */ | |
| 122 | TValue env; /* temporary place for environments */ | |
| 123 | GCObject *openupval; /* list of open upvalues in this stack */ | |
| 124 | GCObject *gclist; | |
| 125 | struct lua_longjmp *errorJmp; /* current error recover point */ | |
| 126 | ptrdiff_t errfunc; /* current error handling function (stack index) */ | |
| 127 | }; | |
| 128 | ||
| 129 | ||
| 130 | #define G(L) (L->l_G) | |
| 131 | ||
| 132 | ||
| 133 | /* | |
| 134 | ** Union of all collectable objects | |
| 135 | */ | |
| 136 | union GCObject { | |
| 137 | GCheader gch; | |
| 138 | union TString ts; | |
| 139 | union Udata u; | |
| 140 | union Closure cl; | |
| 141 | struct Table h; | |
| 142 | struct Proto p; | |
| 143 | struct UpVal uv; | |
| 144 | struct lua_State th; /* thread */ | |
| 145 | }; | |
| 146 | ||
| 147 | ||
| 148 | /* macros to convert a GCObject into a specific value */ | |
| 149 | #define rawgco2ts(o) check_exp((o)->gch.tt == LUA_TSTRING, &((o)->ts)) | |
| 150 | #define gco2ts(o) (&rawgco2ts(o)->tsv) | |
| 151 | #define rawgco2u(o) check_exp((o)->gch.tt == LUA_TUSERDATA, &((o)->u)) | |
| 152 | #define gco2u(o) (&rawgco2u(o)->uv) | |
| 153 | #define gco2cl(o) check_exp((o)->gch.tt == LUA_TFUNCTION, &((o)->cl)) | |
| 154 | #define gco2h(o) check_exp((o)->gch.tt == LUA_TTABLE, &((o)->h)) | |
| 155 | #define gco2p(o) check_exp((o)->gch.tt == LUA_TPROTO, &((o)->p)) | |
| 156 | #define gco2uv(o) check_exp((o)->gch.tt == LUA_TUPVAL, &((o)->uv)) | |
| 157 | #define ngcotouv(o) \ | |
| 158 | check_exp((o) == NULL || (o)->gch.tt == LUA_TUPVAL, &((o)->uv)) | |
| 159 | #define gco2th(o) check_exp((o)->gch.tt == LUA_TTHREAD, &((o)->th)) | |
| 160 | ||
| 161 | /* macro to convert any Lua object into a GCObject */ | |
| 162 | #define obj2gco(v) (cast(GCObject *, (v))) | |
| 163 | ||
| 164 | ||
| 165 | LUAI_FUNC lua_State *luaE_newthread (lua_State *L); | |
| 166 | LUAI_FUNC void luaE_freethread (lua_State *L, lua_State *L1); | |
| 167 | ||
| 168 | #endif | |
| 169 | ||
