JDevlieghere added a comment.

In D151497#4374080 <https://reviews.llvm.org/D151497#4374080>, @bulbazord wrote:

> I think it's good to improve the error messaging but I think we can probably 
> do better. "Function caller" is specific to the internals of LLDB and isn't 
> really meaningful for many users. It's also somewhat confusing from a user's 
> perspective when the expression you're running isn't calling a function.
>
> If I were an end user who didn't know much about LLDB, I would think "I'm 
> trying to print a variable, what's this about a function?" and "Why is memory 
> allocation involved?". I would suggest changing the error message to 
> something like: "Unable to evaluate expression while the process is $STATE: 
> the process must be running and stopped to evaluate this expression".
>
> What do you think?

I very much agree that error messages should first and foremost be helpful to 
our users. In this particular patch, we have two places where we emit this 
error. In `UtilityFunction::MakeFunctionCaller` I believe the current error is 
totally appropriate. That doesn't mean that I think it should be shown to the 
user as such. I didn't look at how this function is called, but if it trips, I 
would like to see an error along the lines of:

  error: Couldn't run utility function. Can't make a function caller while the 
process is stopped: the process must be stopped to allocate memory.

On the other hand, in `UserExpression::Evaluate` I think it's totally 
appropriate to rephrase this, but at the same time I don't think we need to 
dumb this down.

  error: Unable to evaluate expression while the process is $STATE: the process 
must be stopped because the expression might requires allocating memory.

I'll update the error messages accordingly.


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D151497/new/

https://reviews.llvm.org/D151497

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