CODEWITHSUNDEEP
gdbwatch
river
river

Reputation: 734

GDB: How to watch an address whenever new value is assigned to?

I use "watch" command of gdb to track the value of one address. However, gdb only stops when the value is changed to a different one. So how to stop the process whenever the value of the address is assigned a new value, so condition that the same value is assigned will also stops the process.

Upvotes: 1

Views: 1203

Answers (1)

Employed Russian
Employed Russian

Reputation: 213955

So how to stop the process whenever the value of the address is assigned a new value ... (which could be the same as old value).

There is currently no way to do that in GDB.

Although it's not hard to implement this in GDB, the need to do this is rare (the program state is not changed, so why do you care that the same value is written to memory as it was before?).

You can use rwatch to break whenever the value is read. That will give you a superset of your desired break locations, though if the variable is read a lot, and written rarely, rwatch may not be a good solution.

Upvotes: 1

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