Watches / Data breakpoints

[Stephen Illingworth]

Hi all,

I have an awkward bug I'm trying to understand and I'm missing something in my toolbox. Is there any way of monitoring a variable for changes made to it? For example, I have a pointer type and I want a debugger to break whenever its value (ie. what it points to) changes.

I call this a "watch" but I believe it's sometimes referred to as a "data breakpoint".

I've looked at delve and can't see anything like it. I've had a quick look at VSCode and Goland and I can't see anything there either. Is there anything I've missed?

Help

Stephen Illingworth.

[David Finkel]

I don't see anything in Delve's docs either.

I'm pretty sure VSCode and Goland use Delve, so they won't work if Delve doesn't.

With that said, I think gdb works to some extent with Go, and it supports "watchpoints": https://sourceware.org/gdb/current/onlinedocs/gdb/Set-Watchpoints.html#Set-Watchpoints  (Note: I haven't tried debugging a go binary with gdb, so I can't do much more than point you at the manual)

Help

Stephen Illingworth.

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