Ary Borenszweig wrote:
Robert Fraser escribió:
Ary Borenszweig Wrote:
Ary Borenszweig escribió:
http://www.youtube.com/watch?v=rtYCFVPfx4M
Bah... I just realized debugging that kind of things might be really
hart to do. Imagine this:
---
char[] something() {
return "x *= 3; x += 4;";
}
mixin("int bla(int x) { x *= 2; " ~ something ~ " return 4; }");
void main() {
const something = bla(2);
}
---
Now I want to debug the invocation of bla: how the variable x is
being modified. But there's no such place in the source code for that
definition (well, there is, but it's split in pieces, and obviously
you'll get lost when debugging).
So I'm starting to think that the compile-time debugger should work
on the (formatted) compile-time view of the modules. So you'll end up
debugging code like this:
---
char[] something() {
return "x *= 3; x += 4;";
}
int bla(int x) {
x *= 2;
x *= 3;
x += 4;
return x;
}
void main() {
const something = bla(2);
}
---
But that's way more hard to do than what I'm doing right now.
Finally, you might want to have both worlds together, like:
---
char[] someOtherFunc() {
return "char[] x = \"whatever\";";
}
char[] someFunc() {
mixin(someOtherFunc());
return x;
}
mixin(someFunc());
---
Now I want to debug someFunc(). But I also want to see that
someOtherFunc() is expanded well, so I can't just show the
compile-time view of the module, because doing this might have an
error already (the error I want to debug, for example!). (and also
the compile-time view dependens on the function I'm trying to debug)
Aaah... I give up.
(I came to this conclusion when trying to debug the scrappes:units
project).
NO! Don't give up! I've already started using it, and it's very useful
even if it can't debug compile-time-generated code; that's only a very
small use case.
Cool! :-)
Well, I think I'll give up with string mixins for the moment.
What did you debug? What did you find useful? What would you improve?
I debugged my CTFE code that generates string mixins (essentially a
compile-time parser for a limited domain-specific language). Worked like
a charm once I increased Eclipse's memory limits.
