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new experimental syntax using reserved word 'undef'

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This commit is contained in:
Roberto Ierusalimschy
2018-03-07 12:55:38 -03:00
parent 464658b16a
commit 4a1612ff9b
11 changed files with 113 additions and 43 deletions
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14
lvm.c
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@@ -1,5 +1,5 @@
/*
** $Id: lvm.c,v 2.348 2018/02/26 14:16:05 roberto Exp roberto $
** $Id: lvm.c,v 2.349 2018/03/02 18:59:19 roberto Exp roberto $
** Lua virtual machine
** See Copyright Notice in lua.h
*/
@@ -1552,6 +1552,18 @@ void luaV_execute (lua_State *L, CallInfo *ci) {
}
vmbreak;
}
vmcase(OP_UNDEF) {
TValue *rb = vRB(i);
luaT_keydef(L, vra, rb, 1);
vmbreak;
}
vmcase(OP_ISDEF) {
TValue *rb = vRB(i);
TValue *rc = vRC(i);
int res = luaT_keydef(L, rb, rc, 0);
setbvalue(vra, res == GETARG_k(i));
vmbreak;
}
vmcase(OP_CALL) {
int b = GETARG_B(i);
int nresults = GETARG_C(i) - 1;