From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: YAMAMOTO Mitsuharu Newsgroups: gmane.emacs.bugs Subject: bug#11082: 24.0.94; u.glyphless member in struct glyph does not fit in 32 bits Date: Sat, 24 Mar 2012 14:23:28 +0900 Organization: Faculty of Science, Chiba University Message-ID: NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 (generated by SEMI 1.14.6 - "Maruoka") Content-Type: text/plain; charset=US-ASCII X-Trace: dough.gmane.org 1332566653 19411 80.91.229.3 (24 Mar 2012 05:24:13 GMT) X-Complaints-To: usenet@dough.gmane.org NNTP-Posting-Date: Sat, 24 Mar 2012 05:24:13 +0000 (UTC) To: 11082@debbugs.gnu.org Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Sat Mar 24 06:24:13 2012 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1SBJSW-0003rt-5i for geb-bug-gnu-emacs@m.gmane.org; Sat, 24 Mar 2012 06:24:12 +0100 Original-Received: from localhost ([::1]:37266 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1SBJSV-0006L1-6a for geb-bug-gnu-emacs@m.gmane.org; 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Sat, 24 Mar 2012 01:23:39 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1SBJRw-0000un-D4 for bug-gnu-emacs@gnu.org; Sat, 24 Mar 2012 01:23:38 -0400 Original-Received: from mathmail.math.s.chiba-u.ac.jp ([133.82.132.2]:57644) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1SBJRv-0000ua-SB for bug-gnu-emacs@gnu.org; Sat, 24 Mar 2012 01:23:36 -0400 Original-Received: from church.math.s.chiba-u.ac.jp (church [133.82.132.36]) by mathmail.math.s.chiba-u.ac.jp (Postfix) with ESMTP id B8AA9C055D for ; Sat, 24 Mar 2012 14:23:28 +0900 (JST) User-Agent: Wanderlust/2.14.0 (Africa) SEMI/1.14.6 (Maruoka) FLIM/1.14.8 (=?UTF-8?Q?Shij=C5=8D?=) APEL/10.6 Emacs/22.3 (sparc-sun-solaris2.8) MULE/5.0 (SAKAKI) X-detected-operating-system: by eggs.gnu.org: NetBSD 3.0 (DF) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6 (newer, 3) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.13 Precedence: list X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6 (newer, 2) X-Received-From: 140.186.70.43 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.org@gnu.org Original-Sender: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.bugs:58062 Archived-At: In dispextern.h: 316 struct glyph 317 { (snip) 418 /* A union of sub-structures for different glyph types. */ 419 union 420 { (snip) 447 /* Sub-stretch for type == GLYPHLESS_GLYPH. */ 448 struct 449 { 450 /* Value is an enum of the type glyphless_display_method. */ 451 unsigned method : 2; 452 /* 1 iff this glyph is for a character of no font. */ 453 unsigned for_no_font : 1; 454 /* Length of acronym or hexadecimal code string (at most 8). */ 455 unsigned len : 4; 456 /* Character to display. Actually we need only 22 bits. */ 457 unsigned ch : 26; 458 } glyphless; 459 460 /* Used to compare all bit-fields above in one step. */ 461 unsigned val; 462 } u; 463 }; The member `u.glyphless' above requires at least 33 bits and does not fit in the size (32 bits) of `u.val' on many environments. As a result, equality with respect to the `u.val' member (e.g., used in GLYPH_EQUAL_P) does not necessarily mean the equality of glyphless glyphs. According to the comment above, it seems to be OK to shorten the length of `u.glyphless.ch' member from 26 to 25. Could someone confirm this? YAMAMOTO Mitsuharu mituharu@math.s.chiba-u.ac.jp