On Monday, 27 May 2013 at 20:14:35 UTC, Andrei Alexandrescu wrote:
> At some point Walter and I were talking about generating an MD hash for very long names. That has some disadvantages (i.e. no easy reverse lookup) but it may work.

Surely a better solution would be to use a lossless compression? With the amount of repetition you should get very high ratios.

On Monday, 27 May 2013 at 20:34:30 UTC, Peter Alexander wrote:
> On Monday, 27 May 2013 at 20:14:35 UTC, Andrei Alexandrescu wrote:
>> At some point Walter and I were talking about generating an MD hash for very long names. That has some disadvantages (i.e. no easy reverse lookup) but it may work.
>
> Surely a better solution would be to use a lossless compression? With the amount of repetition you should get very high ratios.

It could even be (somewhat) backward compatible if you have a marker at the front indicating whether it's compressed or not.

On Monday, 27 May 2013 at 20:14:35 UTC, Andrei Alexandrescu wrote:
> At some point Walter and I were talking about generating an MD hash for very long names. That has some disadvantages (i.e. no easy reverse lookup) but it may work.
>

Reverse lookup never worked for this kind of symbols in the first place.

On Monday, 27 May 2013 at 20:34:30 UTC, Peter Alexander wrote:
> On Monday, 27 May 2013 at 20:14:35 UTC, Andrei Alexandrescu wrote:
>> At some point Walter and I were talking about generating an MD hash for very long names. That has some disadvantages (i.e. no easy reverse lookup) but it may work.
>
> Surely a better solution would be to use a lossless compression? With the amount of repetition you should get very high ratios.

I'd begin with the mangling of template. It is by definition redundant, and changing it without any compression scheme can already drastically reduce the pathologic cases demonstrated in this thread.

> The way template are mangled in super redundant.

Are you referring to the way that a template name is repeated twice in its
mangled representation ?
eg:
template ABC(T){struct ABC{}}
writeln(ABC!int.mangleof); // S5tests18main10__T3ABCTiZ3ABC =>
corresponding to ABC!(int).ABC
How would we distinguish such cases (eponymous templates) from
non-eponymous ones:
template ABC(T){struct a1{} struct a2}
here we need: ABC!(int).a1 and ABC!(int).a2.
Maybe these 2 cases should be distinguished.


On Mon, May 27, 2013 at 11:22 AM, deadalnix <deadalnix@gmail.com> wrote:

> On Monday, 27 May 2013 at 18:14:59 UTC, Peter Alexander wrote:
>
>> On Monday, 27 May 2013 at 16:18:34 UTC, David Nadlinger wrote:
>>
>>> On Monday, 27 May 2013 at 15:22:21 UTC, Peter Alexander wrote:
>>>
>>>> Am I the only person that worries greatly about the length of symbols in D?
>>>>
>>> ———
>>> <snip>
>>> ———
>>>
>>> That's 13 kilobytes of data for a single symbol name!
>>>
>>
>> The symbols typically contain a lot of repeated sub strings. Perhaps there is a better mangling scheme that encodes it with some kind of prefix tree?
>>
>
> The way template are mangled in super redundant. This can probably be fixed easily, but this is a breakage.
>

ok, reported here: bugzilla:10189

On Sun, May 26, 2013 at 9:03 PM, Daniel Murphy <yebblies@nospamgmail.com>wrote:

> "Timothee Cour" <thelastmammoth@gmail.com> wrote in message news:mailman.207.1369611513.13711.digitalmars-d@puremagic.com...
> > Is there any plan to support demangling of those: __ModuleInfoZ __initZ __arrayZ ?
> >
>
> http://d.puremagic.com/issues/
>
>
>

On 2013-05-27 18:18, David Nadlinger wrote:
> On Monday, 27 May 2013 at 15:22:21 UTC, Peter Alexander wrote:
>> Am I the only person that worries greatly about the length of symbols
>> in D?
>
> No, I do as well. My units of measurement project suffered from very
> non-negligible code bloat due to symbol name length, and even if that
> was a rather extraordinary endeavor to begin with, "normal" D code is
> affected just as well. For example, try this one from the std.algorithm
> unit tests:
>
> ———
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RepeatZ3Zip
>
> ———
>
> That's 13 kilobytes of data for a single symbol name! And the whole file
> also crashes the MinGW as when debug info generation is enabled, with
> the following rather hilarious error message:
>
> "Fatal error: can't close
> N:/Build/Work/ldc2-llvm3.3-release/runtime/phobos_std_algorithm_debug.o:
> File too big"

That's just insane.

-- 
/Jacob Carlborg

On 05/27/2013 08:22 PM, deadalnix wrote:
>
> The way template are mangled in super redundant. This can probably be
> fixed easily, but this is a breakage.

How would you mangle them instead?

On 05/27/2013 10:34 PM, Peter Alexander wrote:
>
> Surely a better solution would be to use a lossless compression?

Yeah, I would hate to loose the ability to demangle a symbol.

On 05/27/2013 06:18 PM, David Nadlinger wrote:
> non-negligible code bloat

I wouldn't really call this code bloat, as it only affects your object files, the linker and the runtime linker.