Add inheritance test and fix some related issues

Zend/tests/type_declarations/union_types/inheritance.phpt

@@ -0,0 +1,46 @@
+--TEST--
+Various inheritance scenarios for properties/methods with union types
+--FILE--
+<?php
+
+class X {
+    public A|B|int $prop;
+    public function method(A|B|int $arg): A|B|int { }
+
+    private A|B|int $prop2;
+    private function method2(A|B|int $arg): A|B|int { }
+}
+
+class Y extends X {
+}
+
+trait T {
+    public A|B|int $prop;
+    public function method(A|B|int $arg): A|B|int { }
+
+    private A|B|int $prop2;
+    private function method2(A|B|int $arg): A|B|int { }
+}
+
+class Z {
+    use T;
+}
+
+class U extends X {
+    use T;
+}
+
+class V extends X {
+    use T;
+
+    public A|B|int $prop;
+    public function method(A|B|int $arg): A|B|int { }
+
+    private A|B|int $prop2;
+    private function method2(A|B|int $arg): A|B|int { }
+}
+
+?>
+===DONE===
+--EXPECT--
+===DONE===

Zend/zend_inheritance.c

@@ -43,7 +43,9 @@ static void overridden_ptr_dtor(zval *zv) /* {{{ */
 static void zend_type_copy_ctor(zend_type *type) {
 	if (ZEND_TYPE_HAS_LIST(*type)) {
 		zend_type_list *old_list = ZEND_TYPE_LIST(*type);
-		zend_type_list *new_list = emalloc(ZEND_TYPE_LIST_SIZE(old_list->num_types));
+		size_t size = ZEND_TYPE_LIST_SIZE(old_list->num_types);
+		zend_type_list *new_list = ZEND_TYPE_USES_ARENA(*type)
+			? zend_arena_alloc(&CG(arena), size) : emalloc(size);
 		memcpy(new_list, old_list, ZEND_TYPE_LIST_SIZE(old_list->num_types));
 		ZEND_TYPE_SET_PTR(*type, new_list);
 

ext/opcache/zend_accelerator_util_funcs.c

@@ -235,20 +235,21 @@ static void zend_hash_clone_prop_info(HashTable *ht)
 
 			if (ZEND_TYPE_HAS_LIST(prop_info->type)) {
 				zend_type_list *list = ZEND_TYPE_LIST(prop_info->type);
-				ZEND_ASSERT(IN_ARENA(list));
-				list = ARENA_REALLOC(list);
-				ZEND_TYPE_SET_PTR(prop_info->type, list);
-
-				void **entry;
-				ZEND_TYPE_LIST_FOREACH_PTR(ZEND_TYPE_LIST(prop_info->type), entry) {
-					if (ZEND_TYPE_LIST_IS_CE(*entry)) {
-						zend_class_entry *ce = ZEND_TYPE_LIST_GET_CE(*entry);
-						if (IN_ARENA(ce)) {
-							ce = ARENA_REALLOC(ce);
-							*entry = ZEND_TYPE_LIST_ENCODE_CE(ce);
+				if (IN_ARENA(list)) {
+					list = ARENA_REALLOC(list);
+					ZEND_TYPE_SET_PTR(prop_info->type, list);
+
+					void **entry;
+					ZEND_TYPE_LIST_FOREACH_PTR(ZEND_TYPE_LIST(prop_info->type), entry) {
+						if (ZEND_TYPE_LIST_IS_CE(*entry)) {
+							zend_class_entry *ce = ZEND_TYPE_LIST_GET_CE(*entry);
+							if (IN_ARENA(ce)) {
+								ce = ARENA_REALLOC(ce);
+								*entry = ZEND_TYPE_LIST_ENCODE_CE(ce);
+							}
 						}
-					}
-				} ZEND_TYPE_LIST_FOREACH_END();
+					} ZEND_TYPE_LIST_FOREACH_END();
+				}
 			} else if (ZEND_TYPE_HAS_CE(prop_info->type)) {
 				zend_class_entry *ce = ZEND_TYPE_CE(prop_info->type);
 				if (IN_ARENA(ce)) {