0001296: Using $this in __debugInfo() causes issues

ID	Project	Category	View Status	Date Submitted	Last Update
0001296	Xdebug	Uncategorized	public	2016-04-26 11:22	2017-03-04 10:45

Reporter	greew	Assigned To
Priority	high	Severity	major	Reproducibility	have not tried
Status	resolved	Resolution	no change required
Platform	Mac	OS	OS X El Capitan	OS Version	10.11.4 (15E65)
Product Version	2.4.0

Summary	0001296: Using $this in __debugInfo() causes issues
Description	When debugging with Xdebug 2.4.0 on PHP 7.0.5, stepping into an object that has a defined debugInfo() method that refers to $this causes an uncaught LogicException; 'The object is in an invalid state as the parent constructor was not called' When single-stepping, the moment the first expression in the constructor is stepped into, execution skips to the debugInfo() method, where it dies upon encountering $this.
Steps To Reproduce	php -dxdebug.auto_trace=1 -dxdebug.collect_params=3 -r 'class Foo extends IteratorIterator{function __construct($items){if(is_array($items)){$items=new ArrayIterator($items);}}function __debugInfo(){return ["count"=>iterator_count($this)];}};$a=new Foo([1,2,3]);var_dump($a);'
Additional Information	13:17 $ php -dxdebug.auto_trace=1 -dxdebug.collect_params=3 -r 'class Foo extends IteratorIterator{function construct($items){if(is_array($items)){$items=new ArrayIterator($items);}}function __debugInfo(){return ["count"=>iterator_count($this)];}};$a=new Foo([1,2,3]);var_dump($a);' PHP Warning: Uncaught LogicException: The object is in an invalid state as the parent constructor was not called in Command line code:1 Stack trace: #0 [internal function]: IteratorIterator->rewind() #1 Command line code(1): iterator_count(Object(Foo)) 0000002 [internal function]: Foo->debugInfo() 0000003 Command line code(1): var_dump(Object(Foo)) 0000004 {main} thrown in Command line code on line 1 PHP Stack trace: PHP 1. {main}() Command line code:0 PHP 2. var_dump(class Foo { }) Command line code:1 Warning: Uncaught LogicException: The object is in an invalid state as the parent constructor was not called in Command line code:1 Stack trace: #0 [internal function]: IteratorIterator->rewind() #1 Command line code(1): iterator_count(Object(Foo)) 0000002 [internal function]: Foo->__debugInfo() 0000003 Command line code(1): var_dump(Object(Foo)) 0000004 {main} thrown in Command line code on line 1 Call Stack: 0.0005 349104 1. {main}() Command line code:0 0.0013 349296 2. var_dump(class Foo { }) Command line code:1 PHP Fatal error: __debuginfo() must return an array in Command line code on line 1 PHP Stack trace: PHP 1. {main}() Command line code:0 PHP 2. var_dump(class Foo { }) Command line code:1 Fatal error: __debuginfo() must return an array in Command line code on line 1 Call Stack: 0.0005 349104 1. {main}() Command line code:0 0.0013 349296 2. var_dump(class Foo { }) Command line code:1 ?-255 ~
Tags	No tags attached.

Operating System	OS X
PHP Version	7.0.0-7.0.4

derick 2016-05-29 08:13 administrator ~0003619	I am not sure how this creates "infinite recursion", but I can reproduce your output. I will need to investigate this.

greew 2016-05-29 11:41 reporter ~0003620	No, I thoughtlessly copied the title of the issue, that I also referenced in the title - but too late I remembered to change it. Sorry about that :)

greew 2016-05-29 11:44 reporter ~0003621	Just tried reproducing it again in PHP 7.0.6 and XDebug 2.5.0-dev - still an issue. 13:43 $ php -dxdebug.auto_trace=1 -dxdebug.collect_params=3 -r 'class Foo extends IteratorIterator{function construct($items){if(is_array($items)){$items=new ArrayIterator($items);}}function __debugInfo(){return ["count"=>iterator_count($this)];}};$a=new Foo([1,2,3]);var_dump($a);' PHP Warning: Uncaught LogicException: The object is in an invalid state as the parent constructor was not called in Command line code:1 Stack trace: #0 [internal function]: IteratorIterator->rewind() #1 Command line code(1): iterator_count(Object(Foo)) 0000002 [internal function]: Foo->debugInfo() 0000003 Command line code(1): var_dump(Object(Foo)) 0000004 {main} thrown in Command line code on line 1 PHP Stack trace: PHP 1. {main}() Command line code:0 PHP 2. var_dump(class Foo { }) Command line code:1 Warning: Uncaught LogicException: The object is in an invalid state as the parent constructor was not called in Command line code:1 Stack trace: #0 [internal function]: IteratorIterator->rewind() #1 Command line code(1): iterator_count(Object(Foo)) 0000002 [internal function]: Foo->__debugInfo() 0000003 Command line code(1): var_dump(Object(Foo)) 0000004 {main} thrown in Command line code on line 1 Call Stack: 0.0010 350840 1. {main}() Command line code:0 0.0032 351032 2. var_dump(class Foo { }) Command line code:1 PHP Fatal error: __debuginfo() must return an array in Command line code on line 1 PHP Stack trace: PHP 1. {main}() Command line code:0 PHP 2. var_dump(class Foo { }) Command line code:1 Fatal error: __debuginfo() must return an array in Command line code on line 1 Call Stack: 0.0010 350840 1. {main}() Command line code:0 0.0032 351032 2. var_dump(class Foo { }) Command line code:1

derick 2016-12-04 15:50 administrator ~0003908	I can reproduce this issue still with PHP 7.0.13 and Xdebug 2.5.0RC2-dev.

derick 2017-01-14 18:23 administrator ~0004185	I tried this again, this time without Xdebug loaded (see the -n), and the result is exactly the same: derick@whisky:~/dev/php/derickr-xdebug $ cat tests/bug01296.phpt --TEST-- Test for bug 0001296: Using $this in debugInfo() causes issues --FILE-- <?php class Foo extends IteratorIterator { function construct( $items ) { if ( is_array( $items ) ) { $items = new ArrayIterator( $items ); } } `function __debugInfo() { return [ "count" => iterator_count( $this ) ]; }` } $a = new Foo( [ 1, 2, 3] ); var_dump( $a ); [GIT: issue1296-debuginfo][PHP: 7.0.13-dev ] derick@whisky:~/dev/php/derickr-xdebug $ php -n tests/bug01296.phpt --TEST-- Test for bug 0001296: Using $this in __debugInfo() causes issues --FILE-- Warning: Uncaught LogicException: The object is in an invalid state as the parent constructor was not called in /home/derick/dev/php/derickr-xdebug/tests/bug01296.phpt:17 Stack trace: #0 [internal function]: IteratorIterator->rewind() #1 /home/derick/dev/php/derickr-xdebug/tests/bug01296.phpt(17): iterator_count(Object(Foo)) 0000002 [internal function]: Foo->__debugInfo() 0000003 /home/derick/dev/php/derickr-xdebug/tests/bug01296.phpt(22): var_dump(Object(Foo)) 0000004 {main} thrown in /home/derick/dev/php/derickr-xdebug/tests/bug01296.phpt on line 17 Fatal error: __debuginfo() must return an array in /home/derick/dev/php/derickr-xdebug/tests/bug01296.phpt on line 22 So I fail to see why this is an Xdebug issue. Can you clarify please?

derick 2017-02-07 17:11 administrator ~0004204	Ping?

derick 2017-03-04 10:45 administrator ~0004227	Closing this as no additional feedback was provided, and the behaviour was the same without Xdebug loaded.

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