FFI: Always resolve metamethods for pointers to structs.

src/lj_carith.c

@@ -218,10 +218,18 @@ static int carith_int64(lua_State *L, CTState *cts, CDArith *ca, MMS mm)
 static int lj_carith_meta(lua_State *L, CTState *cts, CDArith *ca, MMS mm)
 {
   cTValue *tv = NULL;
-  if (tviscdata(L->base))
-    tv = lj_ctype_meta(cts, cdataV(L->base)->ctypeid, mm);
-  if (!tv && L->base+1 < L->top && tviscdata(L->base+1))
-    tv = lj_ctype_meta(cts, cdataV(L->base+1)->ctypeid, mm);
+  if (tviscdata(L->base)) {
+    CTypeID id = cdataV(L->base)->ctypeid;
+    CType *ct = ctype_raw(cts, id);
+    if (ctype_isptr(ct->info)) id = ctype_cid(ct->info);
+    tv = lj_ctype_meta(cts, id, mm);
+  }
+  if (!tv && L->base+1 < L->top && tviscdata(L->base+1)) {
+    CTypeID id = cdataV(L->base+1)->ctypeid;
+    CType *ct = ctype_raw(cts, id);
+    if (ctype_isptr(ct->info)) id = ctype_cid(ct->info);
+    tv = lj_ctype_meta(cts, id, mm);
+  }
   if (!tv) {
     const char *repr[2];
     int i, isenum = -1, isstr = -1;

src/lj_crecord.c

@@ -1081,12 +1081,18 @@ static void crec_arith_meta(jit_State *J, CTState *cts, RecordFFData *rd)
 {
   cTValue *tv = NULL;
   if (J->base[0]) {
-    if (tviscdata(&rd->argv[0]))
-      tv = lj_ctype_meta(cts, argv2cdata(J, J->base[0], &rd->argv[0])->ctypeid,
-			 (MMS)rd->data);
-    if (!tv && J->base[1] && tviscdata(&rd->argv[1]))
-      tv = lj_ctype_meta(cts, argv2cdata(J, J->base[1], &rd->argv[1])->ctypeid,
-			 (MMS)rd->data);
+    if (tviscdata(&rd->argv[0])) {
+      CTypeID id = argv2cdata(J, J->base[0], &rd->argv[0])->ctypeid;
+      CType *ct = ctype_raw(cts, id);
+      if (ctype_isptr(ct->info)) id = ctype_cid(ct->info);
+      tv = lj_ctype_meta(cts, id, (MMS)rd->data);
+    }
+    if (!tv && J->base[1] && tviscdata(&rd->argv[1])) {
+      CTypeID id = argv2cdata(J, J->base[1], &rd->argv[1])->ctypeid;
+      CType *ct = ctype_raw(cts, id);
+      if (ctype_isptr(ct->info)) id = ctype_cid(ct->info);
+      tv = lj_ctype_meta(cts, id, (MMS)rd->data);
+    }
   }
   if (tv) {
     if (tvisfunc(tv)) {