c++/10814: memory handling in exceptions seems to be broken

c++/10814: memory handling in exceptions seems to be broken

[krose]

>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"

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CgogIHJldHVybiAwOwp9Cg==

Re: c++/10814: memory handling in exceptions seems to be broken

[bangerth]

Synopsis: memory handling in exceptions seems to be broken

State-Changed-From-To: open->closed
State-Changed-By: bangerth
State-Changed-When: Fri May 16 14:37:16 2003
State-Changed-Why:
    This is a duplicate of 8047. Someone should really go fix
    that bug.

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=10814