Use stack memory for small name of Struct members
@@ -123,18 +123,29 @@ mrb_struct_ref(mrb_state *mrb, mrb_value obj)
static mrb_sym
mrb_id_attrset(mrb_state *mrb, mrb_sym id)
{
+#define STACKED_ALLOC_MAX 32
+#define STACKED_STRING_MAX (STACKED_ALLOC_MAX - 1) /* '=' character */
+
const char *name;
char *buf;
mrb_int len;
mrb_sym mid;
+ char stacked[STACKED_ALLOC_MAX];
name = mrb_sym2name_len(mrb, id, &len);
+ if (len > STACKED_STRING_MAX) {
buf = (char *)mrb_malloc(mrb, (size_t)len+1);
+ }
+ else {
+ buf = stacked;
+ }
memcpy(buf, name, (size_t)len);
buf[len] = '=';
mid = mrb_intern(mrb, buf, len+1);
+ if (buf != stacked) {
mrb_free(mrb, buf);
+ }
return mid;
}
