I have been trying to find a way for some time to automate the progress in GDB of tracing the control flow of a program.
Even just a simple way of automating the n command so you can see in what order routines are called.
I realise that you can issues n x where x is the number of times GDB steps through, but the trouble with that is that it shows the command but not the address of the routine! But if you press n manually in GDB (then press return to issue the previous command) it shows the address.
I have tried the following in GDB:
(after setting a breakpoint at say 0x0123456)
b *0x0123456
GDB says <breakpoint 1 at 0x123456>. I type:
commands 1
n 1000
c
end
but it doesn't loop as expected, and it doesn't show the address location :-(.
Any help would be appreciated! Surely it must be simple to automatically log the order routines are called??
This is easy, actually. I'll give you the bare bones, and you can modify to suit.
(gdb) define nstep
> set $foo = $arg0
> while ($foo--)
> step
> end
> end
(gdb) nstep 100
I've done this many times. Hope this helps!
How about using strace for system calls and ltrace for library calls to see traces instead of using gdb? strace for system calls and ltrace for library calls work with any application, even if you don't have the source code.
If you have access to the source code, then you could also instrument your own code to do traces. Gcc has a mode that allows you to do that. Here's an example.
Then you would only have to analyze the log files.
If you want to use plain GDB, then you can use Breakpoint Command Lists
You can give any breakpoint (or watchpoint or catchpoint) a series of commands to execute when your program stops due to that breakpoint. For example, you might want to print the values of certain expressions, or enable other breakpoints.
And in particular:
for example, here is how you could use breakpoint commands to print the value of x at entry to foo whenever x is positive.
break foo if x>0
commands
silent
printf "x is %d\n",x
cont
end
There is a shell script for automatized tracing function calls with gdb:
http://blog.superadditive.com/2007/12/01/call-graphs-using-the-gnu-project-debugger/
Because the link is dead now, I'm posting copy of text here (author is Juan M. Bello Rivas - jmbr): http://web.archive.org/web/20090317091725/http://blog.superadditive.com/2007/12/01/call-graphs-using-the-gnu-project-debugger/
Call graphs using the GNU Project Debugger
Chris Ball asked everyone who likes Unix for a tool which would be to function calls what strace and ltrace are for system and library calls respectively.
I wanted to write this myself for a long time but what prevented me from doing so was the fact that I had come up with a trivial shell/awk script that achieved almost the same goal. Since that little program was useful for someone other than me, I thought I’d polish it slightly and post it here.
This tool’s original intent was to print a call graph from a given program. It works by taking control of GDB and automatically setting breakpoints at each function call. Of course, the executable must include debugging symbols (that is, it must have been compiled with gcc’s -g option). Here’s some sample output (the format is: caller callee arguments):
xmltree_parse xmltree_itor_next (self=0x80571e8)
xmltree_itor_next xmlnode_stack_push (stack=0x80571f0, n=0x8056780)
xmltree_parse h_requires (n=0x8056808, u=0xbff9d504)
h_requires xmlnode_get_attr (self=0x8056808, name=0x80520ea "plugin")
h_requires probe_get_name (self=0x8056af0)
h_requires htab_lookup (self=0x8058100, key=0x8056868, len=3, create=0, value=0x0)
You can use the included
cg2dot.awkscript to produce files suitable for processing withgraphviz.
The program (archive size 2110bytes, md5 54b583e637d19be0502ccadfa6174756):
http://web.archive.org/web/20110902010824/http://superadditive.com/software/callgraph.tar.gz
It dumps all functions from program and generate a gdb command file with breakpoints on each function. At each breakpoint, "backtrace 2" and "continue" are executed (via commands).
This script is rather slow on big project (~ thousands of functions), so I added a filter on function list (via egrep). It was very easy. I use this script almost every month.
PS: There is a copy of callgraph.tar.gz for the case when archive.org will delete it from archives. Use xxd -r to restore
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Fenris, is THE tool your looking for, not gdb. Fenris homepage
Authored by the legondary Michal Zalewski, is exactally what your looking for.
Here is my attempt of something similar, using the gdb python API - c - GDB auto stepping - automatic printout of lines, while free running?
I have created a script to do this specifically, it automates gdb to send 's' and then read gdb's output, continuously, and then output the result to a text file and to terminal.
The script is in C, and it is posted on my blog.
http://www.codeground.net/coding/gdb-step-into-all-lines-to-get-full-application-flow/
I came to this question while searching for that script, and couldn't find something exactly like it, so hope this helps someone else.
wget http://www.codeground.net/downloads/gdbwalkthrough.c
gcc gdbwalkthrough.c -o gdbwalkthrough
./gdbwalkthrough <application full path> [application arguments]
This script can be modified easily to step only through a set of lines, or to step only a predefined number of times, just replace
while(1)
writeDebugger("s",NULL);
with this
int x=1000;
while(x--)
writeDebugger("s",NULL);
来源：https://stackoverflow.com/questions/764382/how-to-print-the-next-n-executed-lines-automatically-in-gdb