Use interned strings for class names

Zend/zend_API.h

@@ -167,7 +167,10 @@ typedef struct _zend_fcall_info_cache {
 #define INIT_OVERLOADED_CLASS_ENTRY_EX(class_container, class_name, class_name_len, functions, handle_fcall, handle_propget, handle_propset, handle_propunset, handle_propisset) \
 	{															\
 		int _len = class_name_len;								\
-		class_container.name = zend_strndup(class_name, _len);	\
+		class_container.name = zend_new_interned_string(class_name, _len+1, 0);	\
+		if (class_container.name == class_name) {				\
+			class_container.name = zend_strndup(class_name, _len);	\
+		}														\
 		class_container.name_length = _len;						\
 		class_container.builtin_functions = functions;			\
 		class_container.constructor = NULL;						\

Zend/zend_compile.c

@@ -4486,8 +4486,8 @@ void zend_do_begin_class_declaration(const znode *class_token, znode *class_name
 
 	new_class_entry = emalloc(sizeof(zend_class_entry));
 	new_class_entry->type = ZEND_USER_CLASS;
-	new_class_entry->name = class_name->u.constant.value.str.val;
-	new_class_entry->name_length = class_name->u.constant.value.str.len;
+	new_class_entry->name = zend_new_interned_string(Z_STRVAL(class_name->u.constant), Z_STRLEN(class_name->u.constant) + 1, 1 TSRMLS_CC);
+	new_class_entry->name_length = Z_STRLEN(class_name->u.constant);
 
 	zend_initialize_class_data(new_class_entry, 1 TSRMLS_CC);
 	new_class_entry->filename = zend_get_compiled_filename(TSRMLS_C);

Zend/zend_iterators.c

@@ -51,8 +51,6 @@ static zend_object_handlers iterator_object_handlers = {
 ZEND_API void zend_register_iterator_wrapper(TSRMLS_D)
 {
 	INIT_CLASS_ENTRY(zend_iterator_class_entry, "__iterator_wrapper", NULL);
-	free(zend_iterator_class_entry.name);
-	zend_iterator_class_entry.name = "__iterator_wrapper";
 }
 
 static void iter_wrapper_dtor(void *object, zend_object_handle handle TSRMLS_DC)

Zend/zend_opcode.c

@@ -301,7 +301,9 @@ ZEND_API void destroy_zend_class(zend_class_entry **pce)
 				efree(ce->default_static_members_table);
 			}
 			zend_hash_destroy(&ce->properties_info);
-			efree(ce->name);
+			if (!IS_INTERNED(ce->name)) {
+				efree(ce->name);
+			}
 			zend_hash_destroy(&ce->function_table);
 			zend_hash_destroy(&ce->constants_table);
 			if (ce->num_interfaces > 0 && ce->interfaces) {
@@ -335,7 +337,9 @@ ZEND_API void destroy_zend_class(zend_class_entry **pce)
 				free(ce->default_static_members_table);
 			}
 			zend_hash_destroy(&ce->properties_info);
-			free(ce->name);
+			if (!IS_INTERNED(ce->name)) {
+				free(ce->name);
+			}
 			zend_hash_destroy(&ce->function_table);
 			zend_hash_destroy(&ce->constants_table);
 			if (ce->num_interfaces > 0) {