How to debug ns3 code with eclipse

[TSuai]

Hello:

 I have studied ns for some days, and I've done everything with the official instructions how to config ns3 with eclipse(ns3 wiki), but I still can debug my code with eclipse.

I set a breakpoint in my code which I was sure to be call. but when click dubeg button of eclipse, it done nothing but to end, my breakpoint just bi skipped.can some body help me?

thanks

[Tommaso Pecorella]

Hi,

double check that the breakpoint is active (sometimes eclipse fails in setting up them) and that the code is actually called. It wouldn't be the first time that a similar thing happens (and it did happen to me too).

Try placing a cost just before the breakpoint, and see if it is printed...

Cheers,

T.

[TSuai]

thanks for you reply.

1. I'v done what you siad and I'm sure my code is called, but it still can't work.

2. instead, I try to debug with the waf command(./waf --command-template="gdb %s" --run demo), and my code is simply to print a "helloword". I want to set a breakpoint at the cout statement,but it said that "no debugging symbols found", I think the problem is the "-g" options of g++ command,  am I right? but i dont't know how to do with this? as the following

Reading symbols from /root/AAA/ns3projcets/ns-allinone-3.24.1/ns-3.24.1/build/scratch/demo...(no debugging symbols found)...done.

在 2015年12月28日星期一 UTC+8下午11:52:08，Tommaso Pecorella写道：

[Tommaso Pecorella]

Hi,

make sure you did configure waf with the debug option (-d debug) and that you did include the library path in eclipse. Search the ns-3 wiki for an outdated, but still valid, eclipse configuration guideline.

Cheers,

T.

[TSuai]

Thanks for you help, Tommaso Pecorella!

It works.

在 2015年12月29日星期二 UTC+8下午4:46:56，Tommaso Pecorella写道：

[Yubo Liu]

Hi, Mr. T

I met the same problem with you. I have tried many ways to solve it, but all failed. Could you give me any more details about your solution?

在 2015年12月29日星期二 UTC+8下午10:01:13，Mr. T写道：

[HM]

I have configured debugger based on wiki, library is also set. Debugger just runs the whole program and prints out result instead of stopping at (toggled) breakpoint. I set /usr/local/bin/gdb in GDB debugger field under "debugger" tab. I wrote the full path to my test execution file vanet-routing-compare ".../ns-allinone-3.26/ns-3.26/build/scratch/vanet-routing-compare" in C/C++ application field under "Main" tab. I think every other thing is set in the correct way. Anything missed ?

HM

[Noel Farrugia]

Try and debug it using gdb from the command line maybe it will output some information that will help you solve the problem.

[HM]

The same happens there in terminal, it ignores my breakpoints, there should be something wrong with my application path and .cc code. In Eclipse debug configuration, I set c++ application "ns3.26/build/scratch/APPNAME" which is an executable file (created by waf), however, I set my breakpoints in "ns3.26/scratch/APPNAME.cc". I tried LLDB debugger as well. The same issue exists with LLDB. Am I right in setting up my "debug configuration" ? I just put the code in scratch folder under ns3.26 folder and ./waf it (by eclipse or command). 

[Noel Farrugia]

Is gdb from the terminal outputting some kind of error or message?

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[HM]

No error, it just runs the whole program and quit. The program runs good. I am trying debugger on one of NS-3 examples. But it ignores breakpoints. 

What I do in terminal shell is:

$ gdb

then

(gdb) file /.../ns-allinone-3.26/ns-3.26/build/scratch/test

then

(gdb) break /.../ns-allinone-3.26/ns-3.26/scratch/test.cc:2494

No symbol table is loaded.  Use the "file" command.

Make breakpoint pending on future shared library load? (y or [n]) y

Breakpoint 1 (/.../ns-allinone-3.26/ns-3.26/scratch/test.cc:2494) pending.

then

(gdb) run

Starting program: /.../ns-allinone-3.26/ns-3.26/build/scratch/test 

[New Thread 0x2203 of process 36870]

and it prints out all the results and quit. So it ignores pausing at line 2494 from which I would like to step in. I already configured my ./waf with -d debug argument.

On the other side, after configuring LLDB in eclipse and switching to debug mode it pops up a new tab "Main ()" as can be seen in the image below and by stepping in, debug console shows it is moving over different lines in some other files. I have no idea where it goes through. It doesn't stop at my breakpoint line.

[Noel Farrugia]

GDB is clearly telling you that no symbol table is loaded. Make sure that you’re building ns3 in debug mode. Once that is done, use the command ./waf shell before running gdb because that will set the necessary environment variables for ns3 to run. If that works, check what environments the ./waf shell command is setting and replicate them.