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Full Discussion: Can't debug: assert error with gdb (no problem without)
Top Forums Programming Can't debug: assert error with gdb (no problem without) Post 302754889 by erupter on Friday 11th of January 2013 11:01:06 AM
Old 01-11-2013
Quote:
Originally Posted by jim mcnamara
Is this relevant to your example? (post #1)

warning: Source file is more recent than executable.
Not really, I had modified the phrasing of the if to see if gdb behaved any differently. It didn't.
Quote:
Originally Posted by jim mcnamara
Just because gdb shows line #1 of a multiline construct does not mean that line #1 of your if block is the problem.

If you actually want to debug it, break the if's into singletons(this is logical decompostion to monads, so by a theorem by Courcelle):
That's not exactly the problem: the if gives way to a goto statement.
But if any of the conditions triggered the conditional to go fordward, gdb ought to show the call to the goto instruction... at least for what I know.
It instead shows the program as jumping directly to the first line after the goto label.

If then it isn't so, I'll separate the various ifs.


I tried your suggestion anyway.
Code:
        if (pgm_error->domain == PGM_ERROR_DOMAIN_SOCKET)
        {     
           if(pgm_error->code != PGM_ERROR_INVAL)
           {
              if(pgm_error->code != PGM_ERROR_BADF )
              {
                  if(pgm_error->code != PGM_ERROR_FAULT)
                    do_this=1;
              }
           }
        }            
        if(pgm_error->domain == PGM_ERROR_DOMAIN_IF) 
        {     
           if(pgm_error->code != PGM_ERROR_INVAL)
           {
              if(pgm_error->code != PGM_ERROR_BADF )
              {
                  if(pgm_error->code != PGM_ERROR_FAULT)
                    do_this=1;
              }
           }
        }            
        if(do_this)
        {
            goto err_abort;
        }

And here is the output of gdb, i interleaved the step instructions with info locals to show the value of do_this
Code:
Breakpoint 1, zmq::pgm_socket_t::init (this=0x7ffff0000930, 
    udp_encapsulation_=true, network_=<optimized out>) at pgm_socket.cpp:311
311            if (pgm_error->domain == PGM_ERROR_DOMAIN_SOCKET)
(gdb) info locals
port_number = 5678
sa_family = 2
pgm_error = 0x7ffff0000f40
buf = {3829176425, 4105231441}
if_req = {ir_interface = 3, ir_scope_id = 0}
do_this = 0
res = 0x7ffff0001110
addr = {sa_port = 5678, sa_addr = {gsi = {
      identifier = "\310\362\033\036\237\200"}, sport = 0}}
(gdb) step
Too many open files (signaler.cpp:230)
313               if(pgm_error->code != PGM_ERROR_INVAL)
(gdb) info locals
port_number = 5678
sa_family = 2
pgm_error = 0x7ffff0000f40
buf = {3829176425, 4105231441}
if_req = {ir_interface = 3, ir_scope_id = 0}
do_this = 0
res = 0x7ffff0001110
addr = {sa_port = 5678, sa_addr = {gsi = {
      identifier = "\310\362\033\036\237\200"}, sport = 0}}
(gdb) step
315                  if(pgm_error->code != PGM_ERROR_BADF )
(gdb) info locals
port_number = 5678
sa_family = 2
pgm_error = 0x7ffff0000f40
buf = {3829176425, 4105231441}
if_req = {ir_interface = 3, ir_scope_id = 0}
do_this = 0
res = 0x7ffff0001110
addr = {sa_port = 5678, sa_addr = {gsi = {
      identifier = "\310\362\033\036\237\200"}, sport = 0}}
(gdb) step
333            if(do_this)
(gdb) 
405        if (sock != NULL) {
(gdb)

As you can see up to the last instruction do_this is zero, yet the jump happens anyway.
Last edited by erupter; 01-11-2013 at 12:19 PM..
 

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