watchpoint

Watchpoints on function-local variables usually get removed upon the function return, with a message «Watchpoint 7 deleted because the program has left the block in». Illustration: struct mystruct{ int a, b, c; }; void MyFunc(){ mystruct obj; obj.a = 2; } int main(){ MyFunc(); } gdb session example (gdb) b 7 Breakpoint 1 at 0x4004f1: file /tmp/test2.cpp, line 7. (gdb) r Starting program: /tmp/test2 Breakpoint 1, MyFunc () at /tmp/test2.cpp:7 7 obj.a = 2; (gdb) wa obj Hardware watchpoint 2: obj (gdb) c Continuing. Hardware watchpoint 2: obj Old value = {a = 4195600, b = 0, c = 4195328} New

If I try to set a watchpoint I get a gdb error: " can't clear hardware watchpoints without the 'Z2' (write-watchpoint) packet " Then it seems to corrupt the device (on restarting the device it complains that the OS is too old for the SDK, even though it's OS 3.1.2). I've got a bug to track down that really would be easy to track down with a watchpoint so this really is a pain. Anybody know if watchpoints are supposed to work? How to get them to work? Unfortunately this is a known bug in OS 3.1.2. There's rumour of a new 3.1.3 build around the corner, but I don't know if that will fix this

I am trying to track a change of a value using watchpoint in a Java program in Eclipse debugger. The class hierarchy is pretty complex and the value I am tracking is wrapped in container, which is used on many places. To be more specific, there is a container SizeRequirement , which has a property minimum , which I am tracking. This class is used by many layout managers on many places for many components to define requirement for component's sizes. I need to catch exact call, where the value changes/is set for one specific layout manager and one specific component in it. Is it possible to

You can easily set a watchpoint in XCode by following these steps (btw if there is a simpler way, I'd like to know it...): - Run your program - Set a breakpoint in the code where your variable is used - when reaching breakpoint, use a right click on the variable and select 'Watch "nameOfTheVariable"' - Continue execution. The only problem is that execution will stop every time the variable value changes. I would like XCode to continue the execution without stopping, i.e. merely display the value changes in the console output. This feature seems available in command line mode, and although I

Is there any way to track variable changes or memory changes in Xcode? I'm looking for functionality like Visual Studio's data breakpoint. I want to know where my object's view frame is being changed. I want to set a breakpoint at a member variable and run it. Then I could determine where it's changed. Sedate Alien Xcode uses gdb (or lldb , but that's another story) to implement its debugging functionality. gdb has the ability to set hardware watchpoints and hence so does Xcode. This is a useful page for generic debugging of memory errors. Xcode's debugging console window is really just a gdb

I want to set a watchpoint (break on hardware write) temporarily in my C++ program to find memory corruption. I've seen all the ways to do it manually through gdb, but I would like to actually set the watchpoint via some method in my code so I don't have to break into gdb, find out the address, set the watchpoint and then continue. Something like: #define SET_WATCHPOINT(addr) asm ("set break on hardware write %addr") Set hardware watchpoint from child process. #include <signal.h> #include <syscall.h> #include <unistd.h> #include <stdio.h> #include <stdlib.h> #include <stddef.h> #include <sys