How Can I Monitor Variable Changes Using Watchpoints in GDB?

Monitoring Variable Changes in GDB: Access Watchpoints

In GDB, you can set breakpoints to monitor specific events, including memory access. For monitoring variable changes, GDB provides watchpoints.

rwatch and awatch Commands

To set a breakpoint on read access to a variable, use the rwatch command:

gdb$ rwatch <variable>

To set a breakpoint on read/write access, use the awatch command:

gdb$ awatch <variable>

Memory Address Watchpoints

You can also set read watchpoints on memory locations using the rwatch command:

gdb$ rwatch *<address>

Limitations

• rwatch and awatch cannot break on expressions involving GDB variables.
• Hardware or software support is required for watchpoints. To check if hardware watchpoints are supported, use:

gdb$ show can-use-hw-watchpoints

The above is the detailed content of How Can I Monitor Variable Changes Using Watchpoints in GDB?. For more information, please follow other related articles on the PHP Chinese website!