value of "self" in gdb becomes nil
lazarus / 12-Debugger

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tparry_venture · 2016-04-15 18:46

Here is the error message I get:
Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i The GDB
command:"whatis SELF"did not return any result. 
Now this may or may not be a debugger error.
Not sure if something else is clobbering the self pointer.
I call a method of a class and when it returns the self pointer is
nil.

Where would I look for the cause?
This was running fine until recently (is that my code?)It was also
running fine under Laz 1.4.4.

Project is a console app.
Using Dwarf2 in project options


Using Laz 1.6 (ie FPC 3.0.0) 2016-02-14  on WIN 10 64 bit but Laz is
for 32 bit

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Martin_fr · 2016-04-15 20:06

IIRC that message means that gdb neither gave an error, nor a result.
Something that shouldnt happen, but does....

So far, in my tests all versions of gdb fail at some point. So I dont
know if this can be worked around or not.

1) You can try the older gdb from our source forge download page (in
the win32 section)
But first make sure which one you use.

2) Supply more info.
a) sample code / a few lines of context, and what line you are on
b) all the basics from  http://wiki.lazarus.freepascal.org/GDB_Debugge
r_Tips#Create_a_new_Report

You may also alter your settings. Optimization level 0 / no opt. Try
stabs vs dwarf. (but not dwarf 3). Dwarf (2) is preferred.

While stepping is on a begin or end, things may not work.