Does anyone know of a platform-independant method for achieving this? How do I use threaded inserts? As you yourself mentioned, saving state (even doing a mini-dump of the process) for postmortem debugging is possible, or sending a bug report, or asking the user for "what were you Almost. http://silkiconfinder.com/access-violation/ms-access-violation.html
remember MS-DOS, where you could poke a stick anywhere you liked? Additionally, the algorithm which passes the exception along the chain of handlers naturally moves from the most recently called function up the stack to the top-most function. You don't know for sure because somebody is catching it with __except(1) or catch(…), so instead of a nice memory dump with a callstack that tells you exactly where the problem At point (3) when the exception handler for catcher gets control it is a long way down the stack. dig this
It's clearly something to be logged. –Ralph Tandetzky Jan 30 '13 at 18:22 5 actually, there is an advantage to this that people seem to miss. There are several things each handler can do; the commonest cases are: return 'keep looking' (and the next exception handler will be called) unwind the thread context back to a known The proper course of action it to stop the entire program and remove it from memory. By the way, I’m far from being alone on this.
I worked for three more hours and then when I went to save, it trashed my data." Problem #2: Users do not understand that concept of a program that has "crashed" One key thing about the way MSVC exception handling works is that it involves making extra calls down the stack. Reply Anonymous says: September 11, 2004 at 1:44 am > Anything is better than crash simply because > user still has a chance to save his work. C2712 Does anyone know of a platform-independant method for achieving this? [-] No, not really.
On Windows, a particular MSVC compiler option enables Microsoft's Structured Exception Handling (SEH) in C++ EH so that a catch (...) will catch an access violation. __try __except In practice things are more complicated than this - particularly when the optimiser gets involved - and the frame register EBP can get used for other purposes. remember MS-DOS, where you could poke a stick anywhere you liked? Here is the part that actually registers the exception handler: // The exception registration structure, on the stack as an automatic variable __SEH_EXCEPTION_REGISTRATION _lseh_er; // The custom exception handling object, also
It explains in detail how this page works. Access Violation C++ What happens to a radioactive carbon dioxide molecule when its carbon-14 atom decays? "How are you spending your time on the computer?" Are people of Nordic Nations "happier, healthier" with "a Or it's merely an ordinary mistake? Maybe instead of trying to catch bugs inside the program, you could try to become friends with Windows Error Reporting (WER) -- I never pulled this, but as far as I
Read up on access violation. https://social.msdn.microsoft.com/Forums/vstudio/en-US/efb6bd8e-343e-4c25-87e9-5bd7a8338b94/how-to-catch-access-violation-exception?forum=vcgeneral Every function in the file-systems is protected by a try/finally wrapper, and errors are propagated by throwing exception this way if any code DOES throw an exception, every routine in the Access Violation Exception C++ The exception installing and handling code is implemented as a set of macros, defined as: // Note the unmatched braces in these macros. Yes With Seh Exceptions I *think* I've seen it happen - but it has been a while since I've been spelunking in this technology and it may be that I've either misremembered or jumped to
current community chat Stack Overflow Meta Stack Overflow your communities Sign up or log in to customize your list. this contact form On Intel machine, FS register points to the current TEB(Thread Environment Block). I do have the same issues with using exceptions as a mechanism for error propagation as Raymond and Joel do, but that’s unrelated to the affirmative harm that SEH can cause Exceptions are indeed resource demanding and performance degrading, but if properly designed and used where it makes sense, it will spare you alot of grief. Structured Exception Handling Exploit
How can I ensure 5 9’s reliability if the 3rd party code can crash?” Well, the simple answer is to run that untrusted code out-of-proc. One particular issue is that genuine problems such as corrupt memory, I/O errors on the paging file or load time problems with DLLs get handled in the same way as a One might be wondering, how can one use this in practice? http://silkiconfinder.com/access-violation/pxe-e36-access-violation.html The class of bugs that are dangerous to catch with exceptions(which cause some kind of corruption) are _far_ smaller than the class of stupidity bugs that can be found in every
Tags Software Engineering Comments (33) Cancel reply Name * Email * Website Anonymous says: September 10, 2004 at 2:35 pm I'm pretty much in the same camp as Joel wrt exceptions. _set_se_translator No. Do you think those platforms that do define 'access violation' mean the same thing by that term? -Mike Jul 19 '05 #2 P: n/a Alexander Terekhov Steven Reddie wrote: I understand
This model allows the compiler to eliminate the mechanics of tracking the lifetime of certain unwindable objects, and to significantly reduce the code size, if the objects' lifetimes do not overlap Regarding: EDIT: I want my program to be really robust, even against programming errors. ... just curious about it.. Windows Structured Exception Handling i was using something like this: Source code 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
The right approach here is to have a known "jump" exception, of course. But it is BETTER than crash. A improper exception design can make your application more vulernable for DoS, but then again a proper design without exception handling can make you less or equal to one with… Exceptions Check This Out demanding a fix for C++ EH.
In practice however I think that you're right - most apps should probably stay away from SEH. Mike, why is that significant? I do not like a design that throws extensivly as it complicates debugging =), that is why I tried to explain that exceptions should only happen in rare conditions. You will notice the missing instruction to move DWORD pointer from FS:[0x0] register.
Let's look at Microsoft's implementation of try, throw and catch in Win32 C++ to see how it lets us build something to extract this information. Things like access violations or division by zero errors are more like "machine" exceptions, rather than language-level things that you can catch. to make an example, i was asking myself why killing the app from task manager wouldnt result in an exception well, there are lots of more important things i have to And if you are indeed trying to debug a double free problem, then you are apparently able to somehow reproduce the problem, if you are, there are plently of good tools
Sometimes you'd detonate a mine with the stick, and the OS just 'went away'. Right. A memory access violation? There is a dedicated topic on MSDN for SEH vs.
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