Why is it so difficult to get a core dump for exceptions/errors?

[Iain Buclaw]

On Monday, 23 October 2017 at 06:48:50 UTC, Nemanja Boric wrote:
> On Sunday, 22 October 2017 at 11:16:56 UTC, Marenz wrote:
>> One thing that bugged me for years in D is how difficult it is 
>> to get a useful core dump.
>>
>> ```
>> Task terminated with unhandled exception: Invalid memory 
>> operation
>> Full error: 
>> core.exception.InvalidMemoryOperationError at src/core/exception.d(693): Invalid memory operation
>> ----------------
>> uncaught exception
>> dwarfeh(224) fatal error
>> ```
>>
>
> What version of compiler/runtime are you using? I've fixed this 
> behaviour
> (fatal error if no exception handler is found) in v2.076: 
> https://github.com/dlang/druntime/pull/1673 and the fix should 
> actually
> call abort(): 
> https://github.com/dlang/druntime/pull/1673/files#diff-6c3bc1200b51af9b16b902fd88879ca1R227
>
> Judging from the output (dwarfeh(224) fatal error), this patch 
> is not applied
> in your runtime.


That or he's hitting one of the other cases. But looking at the 
line number, seems unlikely.

https://github.com/dlang/druntime/blob/e160a6ad90900917010619c944db2d55731b527d/src/rt/dwarfeh.d#L224

Perhaps dmd druntime could be smarter here and also dump the 
stack trace to stderr.

But first, updates your compiler.