underscores in debug output?

underscores in debug output?

[Christopher Howard]

Hi, what does the underscore character mean in this debug output?

   159:37  5 (delete ((3 . "c") (((2 . "b") (()) 1) (5 . "e") (()) 1)
2) 2)
   163:49  4 (delete ((2 . "b") (()) 1) _)
    152:9  3 (delete _ _)
    86:11  2 (skew _)
     64:6  1 (horizontal-left-link? _)
    46:11  0 (left-tree _)

Knowing the value of those parameters would be super helpful here, but
for some reason they have been replaced by underscores.

Re: underscores in debug output?

[Alex Vong]

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Christopher Howard <ch.howard@zoho.com> writes:

> Hi, what does the underscore character mean in this debug output?
>
>    159:37  5 (delete ((3 . "c") (((2 . "b") (()) 1) (5 . "e") (()) 1)
> 2) 2)
>    163:49  4 (delete ((2 . "b") (()) 1) _)
>     152:9  3 (delete _ _)
>     86:11  2 (skew _)
>      64:6  1 (horizontal-left-link? _)
>     46:11  0 (left-tree _)
>
> Knowing the value of those parameters would be super helpful here, but
> for some reason they have been replaced by underscores.

My guess would be that those values are being garbage-collected. Since _
is the pattern for matching an arbitary value, it is used to denote a
garbage-collected value.

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Re: underscores in debug output?

[Christopher Howard]

Ok, okay. Is there some way to affect that? Perhaps I have to use some
debug printing or stop points to see those values?

On Wed, 2017-08-30 at 22:46 +0800, Alex Vong wrote:
> Christopher Howard <ch.howard@zoho.com> writes:
> 
> > Hi, what does the underscore character mean in this debug output?
> > 
> >    159:37  5 (delete ((3 . "c") (((2 . "b") (()) 1) (5 . "e") (())
> > 1)
> > 2) 2)
> >    163:49  4 (delete ((2 . "b") (()) 1) _)
> >     152:9  3 (delete _ _)
> >     86:11  2 (skew _)
> >      64:6  1 (horizontal-left-link? _)
> >     46:11  0 (left-tree _)
> > 
> > Knowing the value of those parameters would be super helpful here,
> > but
> > for some reason they have been replaced by underscores.
> 
> My guess would be that those values are being garbage-collected.
> Since _
> is the pattern for matching an arbitary value, it is used to denote a
> garbage-collected value.

Re: underscores in debug output?

[Christopher Howard]

Ok, okay. Is there some way to affect that? Perhaps I have to use some
debug printing or stop points to see those values?

On Wed, 2017-08-30 at 22:46 +0800, Alex Vong wrote:
> Christopher Howard <ch.howard@zoho.com> writes:
> 
> > Hi, what does the underscore character mean in this debug output?
> > 
> >    159:37  5 (delete ((3 . "c") (((2 . "b") (()) 1) (5 . "e") (())
> > 1)
> > 2) 2)
> >    163:49  4 (delete ((2 . "b") (()) 1) _)
> >     152:9  3 (delete _ _)
> >     86:11  2 (skew _)
> >      64:6  1 (horizontal-left-link? _)
> >     46:11  0 (left-tree _)
> > 
> > Knowing the value of those parameters would be super helpful here,
> > but
> > for some reason they have been replaced by underscores.
> 
> My guess would be that those values are being garbage-collected.
> Since _
> is the pattern for matching an arbitary value, it is used to denote a
> garbage-collected value.

Re: underscores in debug output?

[Christopher Howard]

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Ok, okay. Is there some way to affect that? Perhaps I have to use some
debug printing or stop points to see those values?

On Wed, 2017-08-30 at 22:46 +0800, Alex Vong wrote:
> Christopher Howard <ch.howard@zoho.com> writes:
> 
> > Hi, what does the underscore character mean in this debug output?
> > 
> >    159:37  5 (delete ((3 . "c") (((2 . "b") (()) 1) (5 . "e") (())
> > 1)
> > 2) 2)
> >    163:49  4 (delete ((2 . "b") (()) 1) _)
> >     152:9  3 (delete _ _)
> >     86:11  2 (skew _)
> >      64:6  1 (horizontal-left-link? _)
> >     46:11  0 (left-tree _)
> > 
> > Knowing the value of those parameters would be super helpful here,
> > but
> > for some reason they have been replaced by underscores.
> 
> My guess would be that those values are being garbage-collected.
> Since _
> is the pattern for matching an arbitary value, it is used to denote a
> garbage-collected value.
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Re: underscores in debug output?

[Matt Wette]

> On Aug 29, 2017, at 8:56 PM, Christopher Howard <ch.howard@zoho.com> wrote:
> 
> Hi, what does the underscore character mean in this debug output?
> 
>    159:37  5 (delete ((3 . "c") (((2 . "b") (()) 1) (5 . "e") (()) 1)
> 2) 2)
>    163:49  4 (delete ((2 . "b") (()) 1) _)
>     152:9  3 (delete _ _)
>     86:11  2 (skew _)
>      64:6  1 (horizontal-left-link? _)
>     46:11  0 (left-tree _)
> 
> Knowing the value of those parameters would be super helpful here, but
> for some reason they have been replaced by underscores.
> 

I'm finding you get more info if you "guild compile -O0 file.scm" your problematic code files prior to debug session.