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towards a "stackless" call of metamethods (?)

This commit is contained in:
Roberto Ierusalimschy 2003-10-27 17:14:31 -02:00
parent 275c150b17
commit 1e944de6cb
1 changed files with 24 additions and 18 deletions
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42
lvm.c
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@ -1,5 +1,5 @@
/*
** $Id: lvm.c,v 1.288 2003/07/07 13:37:56 roberto Exp roberto $
** $Id: lvm.c,v 1.289 2003/07/16 20:49:02 roberto Exp roberto $
** Lua virtual machine
** See Copyright Notice in lua.h
*/
@ -88,13 +88,17 @@ static void traceexec (lua_State *L, const Instruction *pc) {
}
static void callTMres (lua_State *L, const TObject *f,
const TObject *p1, const TObject *p2, StkId res) {
ptrdiff_t result = savestack(L, res);
static void prepTMcall (lua_State *L, const TObject *f,
const TObject *p1, const TObject *p2) {
setobj2s(L->top, f); /* push function */
setobj2s(L->top+1, p1); /* 1st argument */
setobj2s(L->top+2, p2); /* 2nd argument */
luaD_checkstack(L, 3); /* cannot check before (could invalidate p1, p2) */
}
static void callTMres (lua_State *L, StkId res) {
ptrdiff_t result = savestack(L, res);
luaD_checkstack(L, 3);
L->top += 3;
luaD_call(L, L->top - 3, 1);
res = restorestack(L, result);
@ -104,13 +108,8 @@ static void callTMres (lua_State *L, const TObject *f,
static void callTM (lua_State *L, const TObject *f,
const TObject *p1, const TObject *p2, const TObject *p3) {
setobj2s(L->top, f); /* push function */
setobj2s(L->top+1, p1); /* 1st argument */
setobj2s(L->top+2, p2); /* 2nd argument */
setobj2s(L->top+3, p3); /* 3th argument */
luaD_checkstack(L, 4); /* cannot check before (could invalidate p1...p3) */
static void callTM (lua_State *L) {
luaD_checkstack(L, 4);
L->top += 4;
luaD_call(L, L->top - 4, 0);
}
@ -133,7 +132,8 @@ void luaV_gettable (lua_State *L, const TObject *t, TObject *key, StkId val) {
else if (ttisnil(tm = luaT_gettmbyobj(L, t, TM_INDEX)))
luaG_typeerror(L, t, "index");
if (ttisfunction(tm)) {
callTMres(L, tm, t, key, val);
prepTMcall(L, tm, t, key);
callTMres(L, val);
return;
}
t = tm; /* else repeat with `tm' */
@ -159,7 +159,9 @@ void luaV_settable (lua_State *L, const TObject *t, TObject *key, StkId val) {
else if (ttisnil(tm = luaT_gettmbyobj(L, t, TM_NEWINDEX)))
luaG_typeerror(L, t, "index");
if (ttisfunction(tm)) {
callTM(L, tm, t, key, val);
prepTMcall(L, tm, t, key);
setobj2s(L->top+3, val); /* 3th argument */
callTM(L);
return;
}
t = tm; /* else repeat with `tm' */
@ -174,7 +176,8 @@ static int call_binTM (lua_State *L, const TObject *p1, const TObject *p2,
if (ttisnil(tm))
tm = luaT_gettmbyobj(L, p2, event); /* try second operand */
if (!ttisfunction(tm)) return 0;
callTMres(L, tm, p1, p2, res);
prepTMcall(L, tm, p1, p2);
callTMres(L, res);
return 1;
}
@ -201,7 +204,8 @@ static int call_orderTM (lua_State *L, const TObject *p1, const TObject *p2,
tm2 = luaT_gettmbyobj(L, p2, event);
if (!luaO_rawequalObj(tm1, tm2)) /* different metamethods? */
return -1;
callTMres(L, tm1, p1, p2, L->top);
prepTMcall(L, tm1, p1, p2);
callTMres(L, L->top);
return !l_isfalse(L->top);
}
@ -280,7 +284,8 @@ int luaV_equalval (lua_State *L, const TObject *t1, const TObject *t2) {
default: return gcvalue(t1) == gcvalue(t2);
}
if (tm == NULL) return 0; /* no TM? */
callTMres(L, tm, t1, t2, L->top); /* call TM */
prepTMcall(L, tm, t1, t2);
callTMres(L, L->top); /* call TM */
return !l_isfalse(L->top);
}
@ -334,7 +339,8 @@ static StkId Arith (lua_State *L, StkId ra, const TObject *rb,
const TObject *f = luaH_getstr(hvalue(gt(L)), G(L)->tmname[TM_POW]);
if (!ttisfunction(f))
luaG_runerror(L, "`__pow' (`^' operator) is not a function");
callTMres(L, f, b, c, ra);
prepTMcall(L, f, b, c);
callTMres(L, ra);
break;
}
default: lua_assert(0); break;