#45904 [Opn]: extends from a class which is extends from another cause executor failed

[laruence at yahoo dot com dot cn]

 ID:               45904
 User updated by:  laruence at yahoo dot com dot cn
 Reported By:      laruence at yahoo dot com dot cn
 Status:           Open
 Bug Type:         Scripting Engine problem
 Operating System: rhel-4.x
 PHP Version:      5.2.6
 New Comment:

sorry , but I found that the realy  reson is:

top_statement:
        statement
 ...
    |   class_declaration_statement     {
zend_do_early_binding(TSRMLS_C); }
...
;

while the :
             void zend_do_early_binding(TSRMLS_D){
...
...
                    if (zend_lookup_class(Z_STRVAL_P(parent_name),
Z_STRLEN_P(parent_name), &pce TSR
MLS_CC) == FAILURE) {
                        return;
                    }
...
...

}

so, early_binding couldn't add the class a in to class_table ,because
the class b is also a drived class and its parent class c is defined 
last in the script , so when zend_do_early_binding processing class b
declaration, it will not be able to find class c in class_table .

so the ZE delay the process until executing process ,  while the
declaration of class a is on the same way .

I think this must be the really reason ...

;)


Previous Comments:
------------------------------------------------------------------------

[2008-08-24 18:33:19] laruence at yahoo dot com dot cn

Description:
------------
I found when I extends from a class which is also extended from a class
cause the complie failed .

the parsing process:
starr:
    top_statement_list
;

top_statement_list:
        top_statement_list 
.... //有省略
;

top_statement:
.... //有省略
    |   class_declaration_statement   
 .... //有省略
;

class_declaration_statement:
        unticked_class_declaration_statement 
;

unticked_class_declaration_statement:
        class_entry_type T_STRING extends_from
.... //有省略
;

class_entry_type:
        T_CLASS
.... //有省略
;

extends_from:
        /* empty */   
    |   T_EXTENDS fully_qualified_class_name
.... //有省略
;
fully_qualified_class_name:
        T_STRING { zend_do_fetch_class(&$$, &$1 TSRMLS_CC); }
;

but if class with named fully_qualified_class_name is also a inherited
class , it cause executor failed.

  after I tracing the parser, I found the reason maybe:

  when opcode ZEND_FETCH_CLASS(op2 is b) which is used to generated
class  a was executed.  the class b was not in the class table yet,
because  class b is a drived class too ,it also  need
ZEND_DECLARE_INHERITED_CLASS belong to its to be executed for add
itself to class_table.

so ,I think this should be a bug, am I wrong?



Reproduce code:
---------------
<?php
class a extends b {
};
class b extends c{
};
class c{
};
?>

Expected result:
----------------
PHP Fatal error:  Class 'b' not found in /home/xinchen/1.php on line 2
Fatal error: Class 'b' not found in /home/xinchen/1.php on line 2


Actual result:
--------------
http://www.laruence.com/2008/08/24/427.html


------------------------------------------------------------------------


-- 
Edit this bug report at http://bugs.php.net/?id=45904&edit=1