Re: [fpc-devel] Windows 64bit SEH exception handling
On Wed, 20 Jun 2012, Sergei Gorelkin wrote: 19.06.2012 23:43, tomek пишет: Hello, with reference to http://bugs.freepascal.org/view.php?id=12742 about random crash with Windows OpenDialog Box only on Win7 64bit. Today I compile trunk-fpc with TEST_WIN64_SEH support and it seems that this bug is resolved with SEH. I checked a few times to make sure that this is due to SEH support. My question is, why? how is it possible that support for SEH exceptions handling fix OpenDialog issue ? or perhaps an exception is hidden ? as described in http://support.microsoft.com/kb/976038 do have you any suggestions ? Non-SEH exception handling on Win64 is known to handle exceptions too early, bypassing frame-based handlers and therefore disrupting the intended control flow. Most probably the exception under question was meant to be handled within OS libraries and not passed to the application. It makes you wonder why they created 2 systems in the first place... Michael.___ fpc-devel maillist - fpc-devel@lists.freepascal.org http://lists.freepascal.org/mailman/listinfo/fpc-devel
[fpc-devel] Windows 64bit SEH exception handling
Hello, with reference to http://bugs.freepascal.org/view.php?id=12742 about random crash with Windows OpenDialog Box only on Win7 64bit. Today I compile trunk-fpc with TEST_WIN64_SEH support and it seems that this bug is resolved with SEH. I checked a few times to make sure that this is due to SEH support. My question is, why? how is it possible that support for SEH exceptions handling fix OpenDialog issue ? or perhaps an exception is hidden ? as described in http://support.microsoft.com/kb/976038 do have you any suggestions ? Thanks, Tomek ___ fpc-devel maillist - fpc-devel@lists.freepascal.org http://lists.freepascal.org/mailman/listinfo/fpc-devel
Re: [fpc-devel] Windows 64bit SEH exception handling
19.06.2012 23:43, tomek пишет: Hello, with reference to http://bugs.freepascal.org/view.php?id=12742 about random crash with Windows OpenDialog Box only on Win7 64bit. Today I compile trunk-fpc with TEST_WIN64_SEH support and it seems that this bug is resolved with SEH. I checked a few times to make sure that this is due to SEH support. My question is, why? how is it possible that support for SEH exceptions handling fix OpenDialog issue ? or perhaps an exception is hidden ? as described in http://support.microsoft.com/kb/976038 do have you any suggestions ? Non-SEH exception handling on Win64 is known to handle exceptions too early, bypassing frame-based handlers and therefore disrupting the intended control flow. Most probably the exception under question was meant to be handled within OS libraries and not passed to the application. Regards, Sergei ___ fpc-devel maillist - fpc-devel@lists.freepascal.org http://lists.freepascal.org/mailman/listinfo/fpc-devel
