From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 2164 invoked by alias); 12 Feb 2009 09:41:52 -0000 Received: (qmail 2152 invoked by uid 22791); 12 Feb 2009 09:41:51 -0000 X-SWARE-Spam-Status: No, hits=-1.6 required=5.0 tests=AWL,BAYES_00,KAM_STOCKGEN,SPF_HELO_PASS,SPF_PASS X-Spam-Check-By: sourceware.org Received: from mx2.redhat.com (HELO mx2.redhat.com) (66.187.237.31) by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Thu, 12 Feb 2009 09:41:43 +0000 Received: from int-mx2.corp.redhat.com (int-mx2.corp.redhat.com [172.16.27.26]) by mx2.redhat.com (8.13.8/8.13.8) with ESMTP id n1C9feP1005370; Thu, 12 Feb 2009 04:41:40 -0500 Received: from ns3.rdu.redhat.com (ns3.rdu.redhat.com [10.11.255.199]) by int-mx2.corp.redhat.com (8.13.1/8.13.1) with ESMTP id n1C9febD019379; Thu, 12 Feb 2009 04:41:40 -0500 Received: from host0.dyn.jankratochvil.net (sebastian-int.corp.redhat.com [172.16.52.221]) by ns3.rdu.redhat.com (8.13.8/8.13.8) with ESMTP id n1C9fcGS027312; Thu, 12 Feb 2009 04:41:39 -0500 Received: from host0.dyn.jankratochvil.net (localhost [127.0.0.1]) by host0.dyn.jankratochvil.net (8.14.3/8.14.3) with ESMTP id n1C9fZgg026983; Thu, 12 Feb 2009 10:41:36 +0100 Received: (from jkratoch@localhost) by host0.dyn.jankratochvil.net (8.14.3/8.14.2/Submit) id n1C9fZQO026980; Thu, 12 Feb 2009 10:41:35 +0100 Date: Thu, 12 Feb 2009 09:41:00 -0000 From: Jan Kratochvil To: Mark Kettenis Cc: drow@false.org, gdb-patches@sourceware.org Subject: Re: [patch] Fix `return' of long/long-long results with no debuginfo Message-ID: <20090212094134.GA26915@host0.dyn.jankratochvil.net> References: <20090211194511.GA9324@host0.dyn.jankratochvil.net> <200902112040.n1BKdxb3028188@brahms.sibelius.xs4all.nl> <20090211205045.GB9762@caradoc.them.org> <200902112122.n1BLMf8q000100@brahms.sibelius.xs4all.nl> <20090211214646.GA22247@host0.dyn.jankratochvil.net> <200902112244.n1BMiK36012947@brahms.sibelius.xs4all.nl> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <200902112244.n1BMiK36012947@brahms.sibelius.xs4all.nl> User-Agent: Mutt/1.5.18 (2008-05-17) X-IsSubscribed: yes Mailing-List: contact gdb-patches-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: gdb-patches-owner@sourceware.org X-SW-Source: 2009-02/txt/msg00280.txt.bz2 On Wed, 11 Feb 2009 23:44:21 +0100, Mark Kettenis wrote: > Thinking a bit more of this now, things all depend on the calling > convention. I'm not convinced casting to `long long' is safe in all > cases, especially on 32-bit big-endian machines. It really might do > the wrong thing there, exposing garbage or the wrong 32 bits of the > 64-bit value. > > The 'int' case is really special in a sense, very much because of the > K&R heritage. It has to work for all types that are sizeof(int) or > smaller. OK to check-in this patch? Regression-tested on x86_64-unknown-linux-gnu. Thanks, Jan gdb/ 2009-02-12 Mark Kettenis * stack.c (return_command): Returned type for functions with no debug info is now the type of user specified expression. gdb/testsuite/ 2009-02-12 Jan Kratochvil * gdb.base/return-nodebug.exp, gdb.base/return-nodebug.c: New. --- gdb/stack.c 11 Feb 2009 16:07:28 -0000 1.185 +++ gdb/stack.c 12 Feb 2009 09:24:18 -0000 @@ -1806,6 +1806,8 @@ return_command (char *retval_exp, int fr the cast fail, this call throws an error. */ if (thisfun != NULL) return_type = TYPE_TARGET_TYPE (SYMBOL_TYPE (thisfun)); + else + return_type = value_type (return_value); if (return_type == NULL) return_type = builtin_type (get_frame_arch (thisframe))->builtin_int; CHECK_TYPEDEF (return_type); --- /dev/null 1 Jan 1970 00:00:00 -0000 +++ gdb/testsuite/gdb.base/return-nodebug.c 12 Feb 2009 09:24:18 -0000 @@ -0,0 +1,40 @@ +/* This testcase is part of GDB, the GNU debugger. + + Copyright 2009 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see . */ + +#include + +static TYPE +func (void) +{ + return (TYPE) -1; +} + +static void +marker (void) +{ +} + +int +main (void) +{ + printf ("result=" FORMAT "\n", CAST func ()); + + /* Cannot `next' with no debug info. */ + marker (); + + return 0; +} --- /dev/null 1 Jan 1970 00:00:00 -0000 +++ gdb/testsuite/gdb.base/return-nodebug.exp 12 Feb 2009 09:24:18 -0000 @@ -0,0 +1,55 @@ +# Copyright (C) 2009 Free Software Foundation, Inc. + +# This program is free software; you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation; either version 3 of the License, or +# (at your option) any later version. +# +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program. If not, see . + +proc do_test {type} { + set typenospace [string map {{ } -} $type] + + global pf_prefix + set old_prefix $pf_prefix + lappend pf_prefix "$typenospace:" + + if {[runto "func"]} { + # Test return from a function with no debug info (symbol; still it may + # have a minimal-symbol) if it does not crash. + # Cast of the result to the proper width must be done explicitely. + gdb_test "return ($type) -1" "#0 .* main \\(.*" \ + "return from function with no debug info" \ + "Make selected stack frame return now\\? \\(y or n\\) " "y" + + # And if it returned the full width of the result. + gdb_test "adv marker" "\r\nresult=-1\r\n.* in marker \\(.*" \ + "full width of the returned result" + } + + set pf_prefix $old_prefix +} + +foreach case {{{char} %d (int)} \ + {{short} %d (int)} \ + {{int} %d} \ + {{long} %ld} \ + {{long long} %lld}} { + set type [lindex $case 0] + set format [lindex $case 1] + set cast [lindex $case 2] + + set typeesc [string map {{ } {\ }} $type] + set typenospace [string map {{ } -} $type] + + if {[prepare_for_testing return-nodebug.exp "return-nodebug-$typenospace" "return-nodebug.c" \ + [list "additional_flags=-DFORMAT=\"$format\" -DTYPE=$typeesc -DCAST=$cast"]] == 0} { + do_test $type + } +}