From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.ciao.gmane.io!not-for-mail From: Paul Eggert Newsgroups: gmane.emacs.bugs Subject: bug#41321: 27.0.91; Emacs aborts due to invalid pseudovector objects Date: Sat, 30 May 2020 10:52:07 -0700 Organization: UCLA Computer Science Department Message-ID: <137b759b-f8e0-3c8f-ca53-488559f3c29f@cs.ucla.edu> References: <83zha8cgpi.fsf@gnu.org> <4bab5f55-95fe-cf34-e490-1d4319728395@cs.ucla.edu> <837dwyvi74.fsf@gnu.org> <1484f569-c260-9fb0-bfe1-67897de289d3@cs.ucla.edu> <83blm9tn4j.fsf@gnu.org> <4aeb8963-4fd1-fcd4-e6e1-be409ab54775@cs.ucla.edu> <83r1v5s2p1.fsf@gnu.org> <5351703b-1780-561b-7f68-cdd4ed45e599@cs.ucla.edu> <838shcseng.fsf@gnu.org> <309544a0-d857-13f3-e211-41a40966dcc5@cs.ucla.edu> <00884bff-c7ca-9f67-c3ec-cd3963ca1cb9@cs.ucla.edu> <6fa1ac99-c972-881e-180b-e49d0513504c@cs.ucla.edu> <83ftbim0ha.fsf@gnu.org> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Injection-Info: ciao.gmane.io; 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Sat, 30 May 2020 10:52:08 -0700 (PDT) In-Reply-To: <83ftbim0ha.fsf@gnu.org> Content-Language: en-US X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: "bug-gnu-emacs" Xref: news.gmane.io gmane.emacs.bugs:181245 Archived-At: On 5/29/20 10:54 PM, Eli Zaretskii wrote: >> (USE_LSB_TAG >> ? (uintptr_t) word % GCALIGNMENT == Lisp_Symbol >> : (uintptr_t) word % alignof (struct Lisp_Symbol) == 0) > I don't understand how this will work, given that Lisp object on the > stack can be pushed as 2 non-contiguous 32-bit words. Can you > explain? On a --with-wide-int host where !USE_LSB_TAG, the above test will work correctly on the low-order word of a Lisp object that is a symbol, because ((uintptr_t) word % alignof (struct Lisp_Symbol) == 0) must be true on such a word. The test is only for symbols; it's not for other Lisp objects.