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bug#24617: 26.0.50; Handlers in `condition-case' should have programmati
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From: |
Clément Pit--Claudel |
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Subject: |
bug#24617: 26.0.50; Handlers in `condition-case' should have programmatic access to the backtrace |
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Date: |
Thu, 29 Dec 2016 15:02:53 +0100 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.5.1 |
On 12/29/2016 10:01 AM, Helmut Eller wrote:
>> Second, unconditionally copying the backtrace would be expensive
>>
>> Are you sure about that?
>
> No, but I would be surprised if it were cheap.
Collecting the textual backtrace (by calling 'backtrace') can take arbitrarily
long, because it includes arguments, which can be large strings. I've run into
this (99% of the time was spent on collecting backtraces).
Collecting a full backtrace with backtrace-frame (as objects) is quadratic, but
I don't know if that matters. The master branch has mapbacktrace, which solves
the quadratic part.
Clément.
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