mirror of
https://github.com/lua/lua
synced 2024-11-28 15:43:08 +03:00
7c3cb71fa4
Tables were using this bit to indicate their array sizes were real
('isrealasize'), but this bit can be useful for tests. Instead, they
can use bit 7 of their 'flag' field for that purpose. (There are only
six fast-access metamethods.) This 'flag' field only exists in tables,
so this use does not affect other types.
104 lines
2.8 KiB
C
104 lines
2.8 KiB
C
/*
|
|
** $Id: ltm.h $
|
|
** Tag methods
|
|
** See Copyright Notice in lua.h
|
|
*/
|
|
|
|
#ifndef ltm_h
|
|
#define ltm_h
|
|
|
|
|
|
#include "lobject.h"
|
|
|
|
|
|
/*
|
|
* WARNING: if you change the order of this enumeration,
|
|
* grep "ORDER TM" and "ORDER OP"
|
|
*/
|
|
typedef enum {
|
|
TM_INDEX,
|
|
TM_NEWINDEX,
|
|
TM_GC,
|
|
TM_MODE,
|
|
TM_LEN,
|
|
TM_EQ, /* last tag method with fast access */
|
|
TM_ADD,
|
|
TM_SUB,
|
|
TM_MUL,
|
|
TM_MOD,
|
|
TM_POW,
|
|
TM_DIV,
|
|
TM_IDIV,
|
|
TM_BAND,
|
|
TM_BOR,
|
|
TM_BXOR,
|
|
TM_SHL,
|
|
TM_SHR,
|
|
TM_UNM,
|
|
TM_BNOT,
|
|
TM_LT,
|
|
TM_LE,
|
|
TM_CONCAT,
|
|
TM_CALL,
|
|
TM_CLOSE,
|
|
TM_N /* number of elements in the enum */
|
|
} TMS;
|
|
|
|
|
|
/*
|
|
** Mask with 1 in all fast-access methods. A 1 in any of these bits
|
|
** in the flag of a (meta)table means the metatable does not have the
|
|
** corresponding metamethod field. (Bit 7 of the flag is used for
|
|
** 'isrealasize'.)
|
|
*/
|
|
#define maskflags (~(~0u << (TM_EQ + 1)))
|
|
|
|
|
|
/*
|
|
** Test whether there is no tagmethod.
|
|
** (Because tagmethods use raw accesses, the result may be an "empty" nil.)
|
|
*/
|
|
#define notm(tm) ttisnil(tm)
|
|
|
|
|
|
#define gfasttm(g,et,e) ((et) == NULL ? NULL : \
|
|
((et)->flags & (1u<<(e))) ? NULL : luaT_gettm(et, e, (g)->tmname[e]))
|
|
|
|
#define fasttm(l,et,e) gfasttm(G(l), et, e)
|
|
|
|
#define ttypename(x) luaT_typenames_[(x) + 1]
|
|
|
|
LUAI_DDEC(const char *const luaT_typenames_[LUA_TOTALTYPES];)
|
|
|
|
|
|
LUAI_FUNC const char *luaT_objtypename (lua_State *L, const TValue *o);
|
|
|
|
LUAI_FUNC const TValue *luaT_gettm (Table *events, TMS event, TString *ename);
|
|
LUAI_FUNC const TValue *luaT_gettmbyobj (lua_State *L, const TValue *o,
|
|
TMS event);
|
|
LUAI_FUNC void luaT_init (lua_State *L);
|
|
|
|
LUAI_FUNC void luaT_callTM (lua_State *L, const TValue *f, const TValue *p1,
|
|
const TValue *p2, const TValue *p3);
|
|
LUAI_FUNC void luaT_callTMres (lua_State *L, const TValue *f,
|
|
const TValue *p1, const TValue *p2, StkId p3);
|
|
LUAI_FUNC void luaT_trybinTM (lua_State *L, const TValue *p1, const TValue *p2,
|
|
StkId res, TMS event);
|
|
LUAI_FUNC void luaT_tryconcatTM (lua_State *L);
|
|
LUAI_FUNC void luaT_trybinassocTM (lua_State *L, const TValue *p1,
|
|
const TValue *p2, int inv, StkId res, TMS event);
|
|
LUAI_FUNC void luaT_trybiniTM (lua_State *L, const TValue *p1, lua_Integer i2,
|
|
int inv, StkId res, TMS event);
|
|
LUAI_FUNC int luaT_callorderTM (lua_State *L, const TValue *p1,
|
|
const TValue *p2, TMS event);
|
|
LUAI_FUNC int luaT_callorderiTM (lua_State *L, const TValue *p1, int v2,
|
|
int inv, int isfloat, TMS event);
|
|
|
|
LUAI_FUNC void luaT_adjustvarargs (lua_State *L, int nfixparams,
|
|
struct CallInfo *ci, const Proto *p);
|
|
LUAI_FUNC void luaT_getvarargs (lua_State *L, struct CallInfo *ci,
|
|
StkId where, int wanted);
|
|
|
|
|
|
#endif
|