On Mon, Mar 7, 2016, at 11:35, Evan Laforge wrote:
When you do GHC.Stack.getCallStack you get a [(String, SrcPos)]. The SrcPos is the position of the calling function, but the String is the callee function. So you can't get the name of the calling function. Instead, you get the name of the function with the call stack annotation. That's not so useful because in say a logging function, I'm interested in the caller's name. I don't need the name of the logging function, it's just something boring like "info" or "warn"!
Is there a reason it was done the way it was, or a way to get the name of the calling function?
The reason we provide the name of the callee is that the standard format for a stack trace is callee+pos :) You point about wanting the caller's name too is well-taken though. In most languages you can just look at the next item in the stack to grab the caller, but with HasCallStack there may be no next item... I doubt it would be hard to add the caller's name too, I'd be happy to look into it post-ICFP. Would you mind filing a ticket? Eric