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bug#23164: 25.1.50; xref-find-definitions with local tags-file-name fail
From: |
Johan Claesson |
Subject: |
bug#23164: 25.1.50; xref-find-definitions with local tags-file-name fails |
Date: |
Mon, 04 Apr 2016 23:14:40 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/25.1.50 (gnu/linux) |
Hi again,
I tried again this time with the TAGS of Emacs itself (emacs/src/TAGS).
And like you have already established the problem does not occur in this
scenario. It does occur with other valid TAGS files, though.
After a little bit of tracing i think the difference that matters is
that emacs/src/TAGS includes two other TAGS file in the very last lines:
../lisp/TAGS,include
../lwlib/TAGS,include
I was not aware of this feature with TAGS files including other TAGS
files before but after invoking xref-find-definitions emacs is visiting
all 3 TAGS files (src/TAGS, lisp/TAGS and lwlib/TAGS). And
xref-find-definitions loops through them all.
If these last lines in emacs/src/TAGS are deleted the problem occurs.
It also occur with other simple TAGS files that do not include other
TAGS files. And the TAGS file i was using when observing the problem
the first time was this kind of simple TAGS file.
Same in master and emacs-25.
Regards,
/Johan
Óscar Fuentes <ofv@wanadoo.es> writes:
> Dmitry Gutov <dgutov@yandex.ru> writes:
>
>> Thanks for the report, but that doesn't seem to be the case here. At
>> least if I replace "/dev/zero" with "~/vc/emacs/src/TAGS", the
>> scenario doesn't lead to an error (I just get "not found"), and if I
>> also use e.g. "CALLN" instead of "foo", the jump to the destination
>> occurs as expected.
>
> I can reproduce it here with an existing TAGS file, on emacs -Q.
>
> GNU Emacs 25.0.92.3 (x86_64-unknown-linux-gnu, X toolkit) of 2016-04-03
>
> at commit fc3cd53900eb5e80b91b6d2615b3800fd2f59c16
>
> Debugger entered--Lisp error: (wrong-type-argument stringp nil)
> expand-file-name(nil)
> tags-expand-table-name(nil)
> visit-tags-table-buffer(t)
> etags--xref-find-definitions("foo")
> #[514 "\300!\207" [etags--xref-find-definitions] 4 "\n\n(fn BACKEND
> SYMBOL)"](etags "foo")
> apply(#[514 "\300!\207" [etags--xref-find-definitions] 4 "\n\n(fn BACKEND
> SYMBOL)"] etags "foo")
> xref-backend-definitions(etags "foo")
> xref--find-xrefs("foo" definitions "foo" nil)
> xref--find-definitions("foo" nil)
> xref-find-definitions("foo")
> eval((xref-find-definitions "foo") nil)
> elisp--eval-last-sexp(nil)
> eval-last-sexp(nil)
> funcall-interactively(eval-last-sexp nil)
> call-interactively(eval-last-sexp nil nil)
> command-execute(eval-last-sexp)