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From Lua 5.2: Allow mixed metamethods for ordered comparisons.

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Needs -DLUAJIT_ENABLE_LUA52COMPAT.
This commit is contained in:
Mike Pall 2012-09-28 19:30:08 +02:00
parent 550ac44e41
commit d08e7bd518
2 changed files with 22 additions and 3 deletions
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10
src/lj_meta.c
View File

@ -386,7 +386,8 @@ TValue *lj_meta_comp(lua_State *L, cTValue *o1, cTValue *o2, int op)
cTValue *mo = lj_meta_lookup(L, tviscdata(o1) ? o1 : o2, mm);
if (LJ_UNLIKELY(tvisnil(mo))) goto err;
return mmcall(L, cont, mo, o1, o2);
} else if (itype(o1) == itype(o2)) { /* Never called with two numbers. */
} else if (LJ_52 || itype(o1) == itype(o2)) {
/* Never called with two numbers. */
if (tvisstr(o1) && tvisstr(o2)) {
int32_t res = lj_str_cmp(strV(o1), strV(o2));
return (TValue *)(intptr_t)(((op&2) ? res <= 0 : res < 0) ^ (op&1));
@ -396,8 +397,13 @@ TValue *lj_meta_comp(lua_State *L, cTValue *o1, cTValue *o2, int op)
ASMFunction cont = (op & 1) ? lj_cont_condf : lj_cont_condt;
MMS mm = (op & 2) ? MM_le : MM_lt;
cTValue *mo = lj_meta_lookup(L, o1, mm);
#if LJ_52
if (tvisnil(mo) && tvisnil((mo = lj_meta_lookup(L, o2, mm))))
#else
cTValue *mo2 = lj_meta_lookup(L, o2, mm);
if (tvisnil(mo) || !lj_obj_equal(mo, mo2)) {
if (tvisnil(mo) || !lj_obj_equal(mo, mo2))
#endif
{
if (op & 2) { /* MM_le not found: retry with MM_lt. */
cTValue *ot = o1; o1 = o2; o2 = ot; /* Swap operands. */
op ^= 3; /* Use LT and flip condition. */

15
src/lj_record.c
View File

@ -969,6 +969,16 @@ static void rec_mm_comp(jit_State *J, RecordIndex *ix, int op)
copyTV(J->L, &ix->tabv, &ix->valv);
while (1) {
MMS mm = (op & 2) ? MM_le : MM_lt; /* Try __le + __lt or only __lt. */
#if LJ_52
if (!lj_record_mm_lookup(J, ix, mm)) { /* Lookup mm on 1st operand. */
ix->tab = ix->key;
copyTV(J->L, &ix->tabv, &ix->keyv);
if (!lj_record_mm_lookup(J, ix, mm)) /* Lookup mm on 2nd operand. */
goto nomatch;
}
rec_mm_callcomp(J, ix, op);
return;
#else
if (lj_record_mm_lookup(J, ix, mm)) { /* Lookup mm on 1st operand. */
cTValue *bv;
TRef mo1 = ix->mobj;
@ -992,8 +1002,9 @@ static void rec_mm_comp(jit_State *J, RecordIndex *ix, int op)
rec_mm_callcomp(J, ix, op);
return;
}
#endif
nomatch:
/* First lookup failed. Retry with __lt and swapped operands. */
/* Lookup failed. Retry with __lt and swapped operands. */
if (!(op & 2)) break; /* Already at __lt. Interpreter will throw. */
ix->tab = ix->key; ix->key = ix->val; ix->val = ix->tab;
copyTV(J->L, &ix->tabv, &ix->keyv);
@ -1742,6 +1753,8 @@ void lj_record_ins(jit_State *J)
ta = IRT_NUM;
} else if (ta == IRT_NUM && tc == IRT_INT) {
rc = emitir(IRTN(IR_CONV), rc, IRCONV_NUM_INT);
} else if (LJ_52) {
ta = IRT_NIL; /* Force metamethod for different types. */
} else if (!((ta == IRT_FALSE || ta == IRT_TRUE) &&
(tc == IRT_FALSE || tc == IRT_TRUE))) {
break; /* Interpreter will throw for two different types. */