GNU bug report logs - #15880
Compute C declarations for DEFSYMs automatically.

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Package: emacs;

Reported by: Paul Eggert <eggert <at> cs.ucla.edu>

Date: Wed, 13 Nov 2013 00:35:02 UTC

Severity: wishlist

Tags: patch

Done: Paul Eggert <eggert <at> cs.ucla.edu>

Bug is archived. No further changes may be made.

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From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Paul Eggert <eggert <at> cs.ucla.edu>
Cc: 15880 <at> debbugs.gnu.org
Subject: bug#15880: Compute C declarations for DEFSYMs automatically.
Date: Mon, 05 Jan 2015 11:51:04 -0500

> Sure.  It's easy to create one patch for autogeneration and link-time
> constants, and a second patch for making Qnil be zero. Attached.  These are
> relative to trunk commit e55a467ec0f758c311d358ceb7d66a8a7d9482c3
> dated today.

Thanks.  I'm worried about:

+/* Yield an integer that tags PTR as a symbol.  */
+#define TAG_SYMPTR(ptr) TAG_PTR (Lisp_Symbol, (char *) (ptr) - (char *) lispsym)

This subtraction can yield a negative number.  For the USE_LSB_TAG case,
that's not a problem, but for the case where we use the MSB for the tag,
a negative number will not have the expected 000 in the MSB.


        Stefan
This bug report was last modified 10 years and 131 days ago.

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