From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 3573 invoked by alias); 16 May 2003 04:56:00 -0000 Mailing-List: contact gcc-prs-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Archive: List-Post: List-Help: Sender: gcc-prs-owner@gcc.gnu.org Received: (qmail 3554 invoked by uid 71); 16 May 2003 04:56:00 -0000 Resent-Date: 16 May 2003 04:56:00 -0000 Resent-Message-ID: <20030516045600.3552.qmail@sources.redhat.com> Resent-From: gcc-gnats@gcc.gnu.org (GNATS Filer) Resent-Cc: gcc-prs@gcc.gnu.org, gcc-bugs@gcc.gnu.org Resent-Reply-To: gcc-gnats@gcc.gnu.org, krose@krose.org Received: (qmail 24387 invoked by uid 48); 16 May 2003 04:51:59 -0000 Message-Id: <20030516045159.24386.qmail@sources.redhat.com> Date: Fri, 16 May 2003 04:56:00 -0000 From: krose@krose.org Reply-To: krose@krose.org To: gcc-gnats@gcc.gnu.org X-Send-Pr-Version: gnatsweb-2.9.3 (1.1.1.1.2.31) Subject: c++/10814: memory handling in exceptions seems to be broken X-SW-Source: 2003-05/txt/msg01829.txt.bz2 List-Id: >Number: 10814 >Category: c++ >Synopsis: memory handling in exceptions seems to be broken >Confidential: no >Severity: serious >Priority: medium >Responsible: unassigned >State: open >Class: sw-bug >Submitter-Id: net >Arrival-Date: Fri May 16 04:56:00 UTC 2003 >Closed-Date: >Last-Modified: >Originator: Kyle Rose >Release: gcc version 3.2.3 20030415 (Debian prerelease) >Organization: >Environment: Linux 2.4.20 Configured with: ../src/configure -v --enable-languages=c,c++,java,f77,objc,ada --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --with-gxx-include-dir=/usr/include/c++/3.2 --enable-shared --with-system-zlib --enable-nls --without-included-gettext --enable-__cxa_atexit --enable-clocale=gnu --enable-java-gc=boehm --enable-objc-gc i386-linux Thread model: posix >Description: There appears to be a problem with memory allocation and exceptions. In the attached .ii file, there is a very short code segment that reproduces the problem I am seeing (in addition to my local header files). When the constructor for class A throws, *something* isn't freed. The size of the leak is not proportional to the size of A, suggesting that the leak is internal to gcc's exception handling code. Even more strangely, if you add "inline" to the beginning of the "explicit B()" line in the attached .ii file, memory allocation behavior is as I would expect it. This same problem also exists, along with a host of other related problems, in gcc-2.95.4. Although I am still using 2.95.4 for production, I would settle even for a workaround for the problems I'm seeing: there, the problem exists to a greater or lesser degree depending on what optimizations are used, but it's ALWAYS there, and especially so with -fno-default-inline, which I require due to 2.95.4's poor default heurstic for determining which functions to inline. >How-To-Repeat: g++-3.2 -g -O1 -fno-default-inline krose.cc -o krose ./krose 100000000 and monitor memory usage. Now, add "inline" before "explicit B()", do the same thing, and note that memory usage stays constant (as it should). >Fix: >Release-Note: >Audit-Trail: >Unformatted: ----gnatsweb-attachment---- Content-Type: application/octet-stream; name="krose-without-inline.ii" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="krose-without-inline.ii" IyAxICJrcm9zZS5jYyIKIyAxICI8YnVpbHQtaW4+IgojIDEgIjxjb21tYW5kIGxpbmU+IgojIDEg Imtyb3NlLmNjIgojIDEgIi91c3IvaW5jbHVkZS9zdGRsaWIuaCIgMSAzCiMgMjUgIi91c3IvaW5j bHVkZS9zdGRsaWIuaCIgMwojIDEgIi91c3IvaW5jbHVkZS9mZWF0dXJlcy5oIiAxIDMKIyAyOTEg Ii91c3IvaW5jbHVkZS9mZWF0dXJlcy5oIiAzCiMgMSAiL3Vzci9pbmNsdWRlL3N5cy9jZGVmcy5o IiAxIDMKIyAyOTIgIi91c3IvaW5jbHVkZS9mZWF0dXJlcy5oIiAyIDMKIyAzMTQgIi91c3IvaW5j bHVkZS9mZWF0dXJlcy5oIiAzCiMgMSAiL3Vzci9pbmNsdWRlL2dudS9zdHVicy5oIiAxIDMKIyAz MTUgIi91c3IvaW5jbHVkZS9mZWF0dXJlcy5oIiAyIDMKIyAyNiAiL3Vzci9pbmNsdWRlL3N0ZGxp Yi5oIiAyIDMKCgoKCgoKCiMgMSAiL3Vzci9saWIvZ2NjLWxpYi9pMzg2LWxpbnV4LzMuMi4zL2lu 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