ltm.c File Reference

#include <string.h>
#include "lua.h"
#include "lobject.h"
#include "lstate.h"
#include "lstring.h"
#include "ltable.h"
#include "ltm.h"

Go to the source code of this file.

Macros
#define	ltm_c
#define	LUA_CORE

Functions
void	luaT_init (lua_State *L)
const TValue *	luaT_gettm (Table *events, TMS event, TString *ename)
const TValue *	luaT_gettmbyobj (lua_State *L, const TValue *o, TMS event)

Variables
static const char	udatatypename [] = "userdata"
LUAI_DDEF const char *const	luaT_typenames_ [LUA_TOTALTAGS]

Macro Definition Documentation

ltm_c

#define ltm_c

Definition at line 10 of file lua-5.2.4/src/ltm.c.

LUA_CORE

#define LUA_CORE

Definition at line 11 of file lua-5.2.4/src/ltm.c.

Function Documentation

luaT_gettm()

const TValue * luaT_gettm	(	Table *	events,
		TMS	event,
		TString *	ename )

Definition at line 52 of file lua-5.2.4/src/ltm.c.

                                                                    {
  const TValue *tm = luaH_getstr(events, ename);
  lua_assert(event <= TM_EQ);
  if (ttisnil(tm)) {  /* no tag method? */
    events->flags |= cast_byte(1u<<event);  /* cache this fact */
    return NULL;
  }
  else return tm;
}

References cast_byte, Table::flags, lua_assert, luaH_getstr(), NULL, TM_EQ, and ttisnil.

luaT_gettmbyobj()

const TValue * luaT_gettmbyobj	(	lua_State *	L,
		const TValue *	o,
		TMS	event )

Definition at line 63 of file lua-5.2.4/src/ltm.c.

                                                                         {
  Table *mt;
  switch (ttypenv(o)) {
    case LUA_TTABLE:
      mt = hvalue(o)->metatable;
      break;
    case LUA_TUSERDATA:
      mt = uvalue(o)->metatable;
      break;
    default:
      mt = G(L)->mt[ttypenv(o)];
  }
  return (mt ? luaH_getstr(mt, G(L)->tmname[event]) : luaO_nilobject);
}

References G, hvalue, LUA_TTABLE, LUA_TUSERDATA, luaH_getstr(), luaO_nilobject, Table::metatable, tmname, ttypenv, and uvalue.

luaT_init()

void luaT_init

(

lua_State *

L

)

Definition at line 32 of file lua-5.2.4/src/ltm.c.

                              {
  static const char *const luaT_eventname[] = {  /* ORDER TM */
    "__index", "__newindex",
    "__gc", "__mode", "__len", "__eq",
    "__add", "__sub", "__mul", "__div", "__mod",
    "__pow", "__unm", "__lt", "__le",
    "__concat", "__call"
  };
  int i;
  for (i=0; i<TM_N; i++) {
    G(L)->tmname[i] = luaS_new(L, luaT_eventname[i]);
    luaS_fix(G(L)->tmname[i]);  /* never collect these names */
  }
}

References G, luaS_fix, luaS_new, TM_N, and tmname.

Variable Documentation

luaT_typenames_

LUAI_DDEF const char* const luaT_typenames_[LUA_TOTALTAGS]

Initial value:

= {
  "no value",
  "nil", "boolean", udatatypename, "number",
  "string", "table", "function", udatatypename, "thread",
  "proto", "upval"  
}

Definition at line 24 of file lua-5.2.4/src/ltm.c.

                                                             {
  "no value",
  "nil", "boolean", udatatypename, "number",
  "string", "table", "function", udatatypename, "thread",
  "proto", "upval"  /* these last two cases are used for tests only */
};

udatatypename

const char udatatypename[] = "userdata"

static

Definition at line 22 of file lua-5.2.4/src/ltm.c.