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Request #34986 New object field for debug_backtrace() result
Submitted: 2005-10-26 06:53 UTC Modified: 2005-10-28 22:08 UTC
From: sebastian@php.net Assigned:
Status: Closed Package: Feature/Change Request
PHP Version: 5.1.0RC3 OS: Irrelevant
Private report: No CVE-ID: None
View Developer Edit
 [2005-10-26 06:53 UTC] sebastian@php.net 
Description:
------------
For some Meta Programming it would be great if debug_backtrace() could return an [object] field (in addition to [class] that contains a reference to respective object.

Reproduce code:
---------------
<?php
class A {
  private $b;

  public function __construct()  {
    $this->b = new B;
  }

  public function aMethod() {
    $this->b->bMethod();
  }
}

class B {
  public function bMethod() {
    print_r(debug_backtrace());
  }
}

$a = new A;
$a->aMethod();
?>

Expected result:
----------------
Array
(
    [0] => Array
        (
            [file] => /home/sb/test.php
            [line] => 10
            [function] => bMethod
            [class] => B
            [object] => <Object id #2>
            [type] => ->
            [args] => Array
                (
                )

        )

    [1] => Array
        (
            [file] => /home/sb/test.php
            [line] => 21
            [function] => aMethod
            [class] => A
            [object] => <Object id #1>
            [type] => ->
            [args] => Array
                (
                )

        )

)

Actual result:
--------------
Array
(
    [0] => Array
        (
            [file] => /home/sb/test.php
            [line] => 10
            [function] => bMethod
            [class] => B
            [type] => ->
            [args] => Array
                (
                )

        )

    [1] => Array
        (
            [file] => /home/sb/test.php
            [line] => 21
            [function] => aMethod
            [class] => A
            [type] => ->
            [args] => Array
                (
                )

        )

)

Patches

Pull Requests

History

AllCommentsChangesGit/SVN commitsRelated reports
 [2005-10-26 09:40 UTC] sebastian@php.net 
Just a clarification: [object] should contain a reference to the object, not an "Object id #x" string. That is only in the example output as that is what would happen for print_r(debug_backtrace()).
 [2005-10-26 10:45 UTC] sebastian@php.net 
The patch below seems to work. If it really does, this was too easy :-)

Index: zend_builtin_functions.c
===================================================================
RCS file: /repository/ZendEngine2/zend_builtin_functions.c,v
retrieving revision 1.277.2.5
diff -u -b -B -r1.277.2.5 zend_builtin_functions.c
--- zend_builtin_functions.c	16 Sep 2005 17:05:06 -0000	1.277.2.5
+++ zend_builtin_functions.c	26 Oct 2005 08:44:25 -0000
@@ -1914,6 +1914,7 @@
 					
 				}
 				add_assoc_string_ex(stack_frame, "type", sizeof("type"), "->", 1);
+				add_assoc_zval_ex(stack_frame, "object", sizeof("object"), ptr->object);
 			} else if (ptr->function_state.function->common.scope) {
 				add_assoc_string_ex(stack_frame, "class", sizeof("class"), ptr->function_state.function->common.scope->name, 1);
 				add_assoc_string_ex(stack_frame, "type", sizeof("type"), "::", 1);
 [2005-10-26 11:03 UTC] sebastian@php.net 
Revised patch, takes care of reference counting (thanks to Derick for pointing this out):

Index: zend_builtin_functions.c
===================================================================
RCS file: /repository/ZendEngine2/zend_builtin_functions.c,v
retrieving revision 1.277.2.5
diff -u -b -B -r1.277.2.5 zend_builtin_functions.c
--- zend_builtin_functions.c	16 Sep 2005 17:05:06 -0000	1.277.2.5
+++ zend_builtin_functions.c	26 Oct 2005 08:56:29 -0000
@@ -1913,6 +1913,9 @@
 					add_assoc_string_ex(stack_frame, "class", sizeof("class"), class_name, dup);
 					
 				}
+				add_assoc_zval_ex(stack_frame, "object", sizeof("object"), ptr->object);
+				ptr->object->refcount++;
+
 				add_assoc_string_ex(stack_frame, "type", sizeof("type"), "->", 1);
 			} else if (ptr->function_state.function->common.scope) {
 				add_assoc_string_ex(stack_frame, "class", sizeof("class"), ptr->function_state.function->common.scope->name, 1);
 [2005-10-28 22:08 UTC] sebastian@php.net 
This bug has been fixed in CVS.

Snapshots of the sources are packaged every three hours; this change
will be in the next snapshot. You can grab the snapshot at
http://snaps.php.net/.
 
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