wip

Author: iluuu1994

Zend/zend_execute.c

@@ -2819,9 +2819,11 @@ static zend_always_inline zval *zend_fetch_dimension_address_inner(HashTable *ht
 					zend_undefined_offset(hval);
 					ZEND_FALLTHROUGH;
 				case BP_VAR_UNSET:
-				case BP_VAR_IS:
 					retval = &EG(uninitialized_zval);
 					break;
+				case BP_VAR_IS:
+					retval = &EG(undef_zval);
+					break;
 				case BP_VAR_RW:
 					retval = zend_undefined_offset_write(ht, hval);
 					break;
@@ -2845,9 +2847,11 @@ static zend_always_inline zval *zend_fetch_dimension_address_inner(HashTable *ht
 						zend_undefined_index(offset_key);
 						ZEND_FALLTHROUGH;
 					case BP_VAR_UNSET:
-					case BP_VAR_IS:
 						retval = &EG(uninitialized_zval);
 						break;
+					case BP_VAR_IS:
+						retval = &EG(undef_zval);
+						break;
 					case BP_VAR_RW:
 						retval = zend_undefined_index_write(ht, offset_key);
 						break;

Zend/zend_execute_API.c

@@ -131,6 +131,7 @@ void init_executor(void) /* {{{ */
 
 	ZVAL_NULL(&EG(uninitialized_zval));
 	ZVAL_ERROR(&EG(error_zval));
+	ZVAL_UNDEF(&EG(undef_zval));
 /* destroys stack frame, therefore makes core dumps worthless */
 #if 0&&ZEND_DEBUG
 	original_sigsegv_handler = signal(SIGSEGV, zend_handle_sigsegv);

Zend/zend_globals.h

@@ -167,6 +167,7 @@ struct _zend_compiler_globals {
 struct _zend_executor_globals {
 	zval uninitialized_zval;
 	zval error_zval;
+	zval undef_zval;
 
 	/* symbol table cache */
 	zend_array *symtable_cache[SYMTABLE_CACHE_SIZE];