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1 /*
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2 ** $Id: ltm.c,v 2.8.1.1 2007/12/27 13:02:25 roberto Exp $
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3 ** Tag methods
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4 ** See Copyright Notice in lua.h
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5 */
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6
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7
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8 #include <string.h>
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9
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10 #define ltm_c
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11 #define LUA_CORE
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12
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13 #include "lua.h"
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14
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15 #include "lobject.h"
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16 #include "lstate.h"
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17 #include "lstring.h"
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18 #include "ltable.h"
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19 #include "ltm.h"
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20
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21
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22
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23 const char *const luaT_typenames[] = {
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24 "nil", "boolean", "userdata", "number",
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25 "string", "table", "function", "userdata", "thread",
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26 "proto", "upval"
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27 };
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28
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29
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30 void luaT_init (lua_State *L) {
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31 static const char *const luaT_eventname[] = { /* ORDER TM */
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32 "__index", "__newindex",
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33 "__gc", "__mode", "__eq",
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34 "__add", "__sub", "__mul", "__div", "__mod",
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35 "__pow", "__unm", "__len", "__lt", "__le",
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36 "__concat", "__call"
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37 };
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38 int i;
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39 for (i=0; i<TM_N; i++) {
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40 G(L)->tmname[i] = luaS_new(L, luaT_eventname[i]);
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41 luaS_fix(G(L)->tmname[i]); /* never collect these names */
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42 }
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43 }
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44
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45
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46 /*
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47 ** function to be used with macro "fasttm": optimized for absence of
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48 ** tag methods
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49 */
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50 const TValue *luaT_gettm (Table *events, TMS event, TString *ename) {
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51 const TValue *tm = luaH_getstr(events, ename);
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52 lua_assert(event <= TM_EQ);
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53 if (ttisnil(tm)) { /* no tag method? */
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54 events->flags |= cast_byte(1u<<event); /* cache this fact */
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55 return NULL;
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56 }
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57 else return tm;
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58 }
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59
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60
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61 const TValue *luaT_gettmbyobj (lua_State *L, const TValue *o, TMS event) {
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62 Table *mt;
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63 switch (ttype(o)) {
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64 case LUA_TTABLE:
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65 mt = hvalue(o)->metatable;
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66 break;
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67 case LUA_TUSERDATA:
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68 mt = uvalue(o)->metatable;
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69 break;
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70 default:
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71 mt = G(L)->mt[ttype(o)];
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72 }
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73 return (mt ? luaH_getstr(mt, G(L)->tmname[event]) : luaO_nilobject);
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74 }
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75
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