Partial file cache support

Unfortunately this doesn't actually work, because the added
assertions trigger. We need to figure out how we can properly
persist and serialize the internal methods defined by enums.

Author: nikic

ext/opcache/zend_file_cache.c

@@ -622,12 +622,12 @@ static void zend_file_cache_serialize_func(zval                     *zv,
                                            zend_file_cache_metainfo *info,
                                            void                     *buf)
 {
-	zend_op_array *op_array;
-
+	zend_function *func;
 	SERIALIZE_PTR(Z_PTR_P(zv));
-	op_array = Z_PTR_P(zv);
-	UNSERIALIZE_PTR(op_array);
-	zend_file_cache_serialize_op_array(op_array, script, info, buf);
+	func = Z_PTR_P(zv);
+	UNSERIALIZE_PTR(func);
+	ZEND_ASSERT(func->type == ZEND_USER_FUNCTION);
+	zend_file_cache_serialize_op_array(&func->op_array, script, info, buf);
 }
 
 static void zend_file_cache_serialize_prop_info(zval                     *zv,
@@ -829,6 +829,14 @@ static void zend_file_cache_serialize_class(zval                     *zv,
 		}
 	}
 
+	if (ce->backed_enum_table) {
+		HashTable *ht;
+		SERIALIZE_PTR(ce->backed_enum_table);
+		ht = ce->backed_enum_table;
+		UNSERIALIZE_PTR(ht);
+		zend_file_cache_serialize_hash(ht, script, info, buf, zend_file_cache_serialize_zval);
+	}
+
 	SERIALIZE_PTR(ce->constructor);
 	SERIALIZE_PTR(ce->destructor);
 	SERIALIZE_PTR(ce->clone);
@@ -1408,11 +1416,11 @@ static void zend_file_cache_unserialize_func(zval                    *zv,
                                              zend_persistent_script  *script,
                                              void                    *buf)
 {
-	zend_op_array *op_array;
-
+	zend_function *func;
 	UNSERIALIZE_PTR(Z_PTR_P(zv));
-	op_array = Z_PTR_P(zv);
-	zend_file_cache_unserialize_op_array(op_array, script, buf);
+	func = Z_PTR_P(zv);
+	ZEND_ASSERT(func->type == ZEND_USER_FUNCTION);
+	zend_file_cache_unserialize_op_array(&func->op_array, script, buf);
 }
 
 static void zend_file_cache_unserialize_prop_info(zval                    *zv,
@@ -1591,6 +1599,12 @@ static void zend_file_cache_unserialize_class(zval                    *zv,
 		}
 	}
 
+	if (ce->backed_enum_table) {
+		UNSERIALIZE_PTR(ce->backed_enum_table);
+		zend_file_cache_unserialize_hash(
+			ce->backed_enum_table, script, buf, zend_file_cache_unserialize_zval, ZVAL_PTR_DTOR);
+	}
+
 	UNSERIALIZE_PTR(ce->constructor);
 	UNSERIALIZE_PTR(ce->destructor);
 	UNSERIALIZE_PTR(ce->clone);