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another (better?) implementation for "pushsubscript".

This commit is contained in:
Roberto Ierusalimschy 1997-05-26 11:23:55 -03:00
parent bd9e68cfcd
commit b546a042e8
1 changed files with 16 additions and 10 deletions
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26
opcode.c
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@ -3,7 +3,7 @@
** TecCGraf - PUC-Rio ** TecCGraf - PUC-Rio
*/ */
char *rcs_opcode="$Id: opcode.c,v 4.3 1997/04/15 17:32:47 roberto Exp roberto $"; char *rcs_opcode="$Id: opcode.c,v 4.4 1997/04/24 22:59:57 roberto Exp roberto $";
#include <setjmp.h> #include <setjmp.h>
#include <stdio.h> #include <stdio.h>
@ -320,9 +320,13 @@ static void do_call (StkId base, int nResults)
*/ */
static void pushsubscript (void) static void pushsubscript (void)
{ {
int tg = luaI_efectivetag(top-2); TObject *im;
TObject *im = luaI_getim(tg, IM_GETTABLE); if (ttype(top-2) != LUA_T_ARRAY) /* not a table, get "gettable" method */
if (ttype(top-2) == LUA_T_ARRAY && ttype(im) == LUA_T_NIL) { im = luaI_getimbyObj(top-2, IM_GETTABLE);
else { /* object is a table... */
int tg = (top-2)->value.a->htag;
im = luaI_getim(tg, IM_GETTABLE);
if (ttype(im) == LUA_T_NIL) { /* and does not have a "gettable" method */
TObject *h = lua_hashget(avalue(top-2), top-1); TObject *h = lua_hashget(avalue(top-2), top-1);
if (h != NULL && ttype(h) != LUA_T_NIL) { if (h != NULL && ttype(h) != LUA_T_NIL) {
--top; --top;
@ -334,13 +338,15 @@ static void pushsubscript (void)
--top; --top;
ttype(top-1) = LUA_T_NIL; ttype(top-1) = LUA_T_NIL;
} }
return;
}
/* else it has a "gettable" method, go through to next command */
} }
else { /* object is not a table, and/or has a specific "gettable" method */ /* object is not a table, or it has a "gettable" method */
if (ttype(im) != LUA_T_NIL) if (ttype(im) != LUA_T_NIL)
callIM(im, 2, 1); callIM(im, 2, 1);
else else
lua_error("indexed expression not a table"); lua_error("indexed expression not a table");
}
} }