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a small optimization

This commit is contained in:
Roberto Ierusalimschy 2001-01-24 14:20:54 -02:00
parent 71ae4801d6
commit c8559e3c8d
2 changed files with 23 additions and 6 deletions
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17
ltm.h
View File

@ -1,5 +1,5 @@
/* /*
** $Id: ltm.h,v 1.19 2000/12/26 18:46:09 roberto Exp roberto $ ** $Id: ltm.h,v 1.20 2001/01/19 13:20:30 roberto Exp roberto $
** Tag methods ** Tag methods
** See Copyright Notice in lua.h ** See Copyright Notice in lua.h
*/ */
@ -35,6 +35,21 @@ typedef enum {
} TMS; } TMS;
/*
** masks for allowable tag methods
*/
#define HAS_TM_GETGLOBAL(L,t) (1<<(t) & ((1<<LUA_TUSERDATA) | \
(1<<LUA_TTABLE) | \
(1<<LUA_TNIL)))
#define HAS_TM_SETGLOBAL(L,t) (1<<(t) & ((1<<LUA_TUSERDATA) | \
(1<<LUA_TTABLE) | \
(1<<LUA_TNIL) | \
(1<<LUA_TFUNCTION)))
struct TM { struct TM {
Closure *method[TM_N]; Closure *method[TM_N];
TString *collected; /* list of garbage-collected udata with this tag */ TString *collected; /* list of garbage-collected udata with this tag */

12
lvm.c
View File

@ -1,5 +1,5 @@
/* /*
** $Id: lvm.c,v 1.155 2001/01/19 13:20:30 roberto Exp roberto $ ** $Id: lvm.c,v 1.156 2001/01/24 15:45:33 roberto Exp roberto $
** Lua virtual machine ** Lua virtual machine
** See Copyright Notice in lua.h ** See Copyright Notice in lua.h
*/ */
@ -174,8 +174,9 @@ void luaV_settable (lua_State *L, StkId t, StkId key) {
const TObject *luaV_getglobal (lua_State *L, TString *s) { const TObject *luaV_getglobal (lua_State *L, TString *s) {
const TObject *value = luaH_getstr(L->gt, s); const TObject *value = luaH_getstr(L->gt, s);
Closure *tm = luaT_gettmbyObj(G(L), value, TM_GETGLOBAL); Closure *tm;
if (tm == NULL) /* is there a tag method? */ if (!HAS_TM_GETGLOBAL(L, ttype(value)) || /* is there a tag method? */
(tm = luaT_gettmbyObj(G(L), value, TM_GETGLOBAL)) == NULL)
return value; /* default behavior */ return value; /* default behavior */
else { /* tag method */ else { /* tag method */
luaD_checkstack(L, 3); luaD_checkstack(L, 3);
@ -191,8 +192,9 @@ const TObject *luaV_getglobal (lua_State *L, TString *s) {
void luaV_setglobal (lua_State *L, TString *s) { void luaV_setglobal (lua_State *L, TString *s) {
TObject *oldvalue = luaH_setstr(L, L->gt, s); TObject *oldvalue = luaH_setstr(L, L->gt, s);
Closure *tm = luaT_gettmbyObj(G(L), oldvalue, TM_SETGLOBAL); Closure *tm;
if (tm == NULL) { /* no tag methods? */ if (!HAS_TM_SETGLOBAL(L, ttype(oldvalue)) || /* no tag methods? */
(tm = luaT_gettmbyObj(G(L), oldvalue, TM_SETGLOBAL)) == NULL) {
setobj(oldvalue, L->top - 1); /* raw set */ setobj(oldvalue, L->top - 1); /* raw set */
} }
else { /* call tag method */ else { /* call tag method */