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Bug 319180

Summary:

"Variables" window shows wrong data if pointer is equal to zero

Product:

[Tools] CDT

Reporter:

Alex <alexei.kornienko>

Component:

cdt-debug

Assignee:

cdt-debug-inbox <cdt-debug-inbox>

Status:

NEW ---

QA Contact:

Jonah Graham <jonah>

Severity:

normal

Priority:

CC:

alexei.kornienko, elaskavaia.cdt, pawel.1.piech

Version:

7.0

Target Milestone:

---

Hardware:

OS:

Windows 7

Whiteboard:

Attachments:

Description	Flags
example class to test the problem	none
Screenshot of the problem	none
CDI traces showing problem	none
DSF-GDB traces showing problem	none

Description Alex

2010-07-07 14:42:36 EDT

Build Identifier: 20100617-1415

I have pointer to an object and it is equal zero.
In "Variables" view eclipse is trying to read memory at address 0x0 and shows empty object of that class.
This is wrong cause in case of data structure such as linked list this happens recursively.
Please see screenshot attached.

Reproducible: Always

Steps to Reproduce:
1. Create object of the class attached
2. Start debug
3. See "Variables" window, open next item

Comment 1 Alex

2010-07-07 14:43:28 EDT

Created attachment 173698 [details]
example class to test the problem

Comment 2 Alex

2010-07-07 14:44:17 EDT

Created attachment 173699 [details]
Screenshot of the problem

Comment 3 Elena Laskavaia

2010-07-07 21:22:49 EDT

Do you have gdb log? I don't think it is CDT problem...

Comment 4 Alex

2010-07-08 05:16:17 EDT

(In reply to comment #3)
> Do you have gdb log? I don't think it is CDT problem...

No I don't :(, you can easily reproduce this bug and get all the logs for yourself. I don't insist that this bug is in CDT cause I don't know eclipse structure well, but it is definitely a bug

Comment 5 Marc Khouzam

2010-07-08 10:05:24 EDT

This happens with both CDI and DSF and, as Elena guessed, seems to be a GDB quirk.  I'll attach the traces and one can see that GDB keeps reporting more and more children.  It would be interesting to as the gdb mailing list if there is a good reason for this behavior.  I used GDB 7.1

Comment 6 Marc Khouzam

2010-07-08 10:06:15 EDT

Created attachment 173773 [details]
CDI traces showing problem

Comment 7 Marc Khouzam

2010-07-08 10:06:41 EDT

Created attachment 173774 [details]
DSF-GDB traces showing problem