Set a watch point on the counter: (gdb) watch var And make that watchpoint conditional: (gdb) cond <watchpoint_number> var>=value If you want to log to a file: (gdb) set logging file <filename> (gdb) set logging on By default gdb logs to gdb.txt
Yes. Using Watchpoints: watch – only breaks on write (and only if the value changes) rwatch – breaks on read, and awatch – breaks on read/write. A more detailed brief from some internet sources: watch watch is gdb’s way of setting data breakpoints which will halt the execution of a program if memory changes at … Read more
In a command prompt I browsed to C:\MinGW\bin and ran: mingw-get.exe install gdb That fixed it for me. Not sure if it matters but I have C:\MinGW\bin in my path (guess I probably didn’t need to browse to C:\MinGW\bin).
To do full source code debugging of the C library on Ubuntu, there are just a few steps to take: Install the debuginfo version of libc6. It’s probably already installed – the gdb package on Ubuntu has a dependency on it – but in case it isn’t, run sudo apt install libc6-dbg. Prepare the package … Read more
You need the /t switch which works with both p and x: (gdb) p /t 0x0000000000400398 $1 = 10000000000001110011000 See help x for more info on the FMT (format) switches.
This script, not written by me, pretty prints STL containers, such as vector, map, etc: http://www.yolinux.com/TUTORIALS/src/dbinit_stl_views-1.03.txt Totally awesome.
x/16xb $edx+0x14 The +0x14 will give you what you are looking for.
You can use ptype. Suppose I add these lines to your example: A alpha; B beta; Now in gdb I can ask for a description of a class type (or an instance of one): (gdb) ptype alpha type = class A { public: virtual void foo(); } (gdb) ptype A type = class A { … Read more
Basing on blog post by Debugging of CPython processes with gdb One more way to resolve the issue is to source python3.5-gdb.py file. Run command info auto-load to check that files are loaded (if so) and if not — load it manually: source /usr/share/gdb/auto-load/usr/bin/python3.5-gdb.py (! path may be different). Then py-bt should work! EDITED: changed … Read more
You can dynamically allocate some space and use it to store a new variable. Depending on what you mean by “scope of the current function” it may not be what you want. But here is how it looks like, when you have function func() that takes a pointer to an output parameter: set $foo = … Read more