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digitalmars.D.learn - exceptions

reply Ellery Newcomer <ellery-newcomer utulsa.edu> writes:
Okay, does anyone know a good way to figure out where something like 
this is coming from:

object.Exception: lengths don't match for array copy
Feb 23 2010
parent reply bearophile <bearophileHUGS lycos.com> writes:
Ellery Newcomer:
 Okay, does anyone know a good way to figure out where something like 
 this is coming from:
 object.Exception: lengths don't match for array copy

void main() { auto a1 = new int[5]; auto a2 = new int[4]; a1[] = a2; } Bye, bearophile
Feb 24 2010
parent reply Ellery Newcomer <ellery-newcomer utulsa.edu> writes:
On 02/24/2010 03:10 AM, bearophile wrote:
 Ellery Newcomer:
 Okay, does anyone know a good way to figure out where something like
 this is coming from:
 object.Exception: lengths don't match for array copy

void main() { auto a1 = new int[5]; auto a2 = new int[4]; a1[] = a2; } Bye, bearophile

I want line numbers
Feb 24 2010
next sibling parent reply Daniel Keep <daniel.keep.lists gmail.com> writes:
Ellery Newcomer wrote:
 On 02/24/2010 03:10 AM, bearophile wrote:
 Ellery Newcomer:
 Okay, does anyone know a good way to figure out where something like
 this is coming from:
 object.Exception: lengths don't match for array copy

void main() { auto a1 = new int[5]; auto a2 = new int[4]; a1[] = a2; } Bye, bearophile

I want line numbers

You could use Tango and enable stack tracing. That or hook up a debugger.
Feb 24 2010
parent reply Ellery Newcomer <ellery-newcomer utulsa.edu> writes:
On 02/24/2010 09:00 AM, Daniel Keep wrote:
 Ellery Newcomer wrote:
 On 02/24/2010 03:10 AM, bearophile wrote:
 Ellery Newcomer:
 Okay, does anyone know a good way to figure out where something like
 this is coming from:
 object.Exception: lengths don't match for array copy

void main() { auto a1 = new int[5]; auto a2 = new int[4]; a1[] = a2; } Bye, bearophile

I want line numbers

You could use Tango and enable stack tracing. That or hook up a debugger.

I am using tango, how do I enable stack tracing?
Feb 24 2010
parent reply Robert Clipsham <robert octarineparrot.com> writes:
On 24/02/10 15:21, Ellery Newcomer wrote:
 On 02/24/2010 09:00 AM, Daniel Keep wrote:
 Ellery Newcomer wrote:
 On 02/24/2010 03:10 AM, bearophile wrote:
 Ellery Newcomer:
 Okay, does anyone know a good way to figure out where something like
 this is coming from:
 object.Exception: lengths don't match for array copy

void main() { auto a1 = new int[5]; auto a2 = new int[4]; a1[] = a2; } Bye, bearophile

I want line numbers

You could use Tango and enable stack tracing. That or hook up a debugger.

I am using tango, how do I enable stack tracing?

---- import tango.core.tools.TraceExceptions; ---- If you want to use gdb then type 'b _d_throw_exception' (or 'b _d_throw' for dmd) before you run your app. This will break on every exception thrown, so you may have to hit 'c' a few times to continue at each thrown exception until you find the one you need.
Feb 24 2010
parent reply Ellery Newcomer <ellery-newcomer utulsa.edu> writes:
On 02/24/2010 10:35 AM, Robert Clipsham wrote:
 On 24/02/10 15:21, Ellery Newcomer wrote:
 On 02/24/2010 09:00 AM, Daniel Keep wrote:
 Ellery Newcomer wrote:
 On 02/24/2010 03:10 AM, bearophile wrote:
 Ellery Newcomer:
 Okay, does anyone know a good way to figure out where something like
 this is coming from:
 object.Exception: lengths don't match for array copy

void main() { auto a1 = new int[5]; auto a2 = new int[4]; a1[] = a2; } Bye, bearophile

I want line numbers

You could use Tango and enable stack tracing. That or hook up a debugger.

I am using tango, how do I enable stack tracing?

---- import tango.core.tools.TraceExceptions; ---- If you want to use gdb then type 'b _d_throw_exception' (or 'b _d_throw' for dmd) before you run your app. This will break on every exception thrown, so you may have to hit 'c' a few times to continue at each thrown exception until you find the one you need.

Thanks! b _d_throw gives me Function "_d_throw" not defined. same for _d_throw_exception. I can get a breakpoint on _d_arraycopy, but there seem to be way too many calls for it to be useful.
Feb 24 2010
parent reply Robert Clipsham <robert octarineparrot.com> writes:
On 24/02/10 17:51, Ellery Newcomer wrote:
 ----
 import tango.core.tools.TraceExceptions;
 ----

 If you want to use gdb then type 'b _d_throw_exception' (or 'b _d_throw'
 for dmd) before you run your app. This will break on every exception
 thrown, so you may have to hit 'c' a few times to continue at each
 thrown exception until you find the one you need.

Thanks! b _d_throw gives me Function "_d_throw" not defined. same for _d_throw_exception. I can get a breakpoint on _d_arraycopy, but there seem to be way too many calls for it to be useful.

Hmm, that's odd... if you type b _d_t<tab> or b _d_<tab> then you should get a list of runtime functions, do you see anything listed there that could be related? It seems odd to me that that function isn't there, it always is for me. I'm pretty sure I use a debug version of the runtime though, so that could be it. Your best option is probably to use Tango's built in stack tracing for now if you can't get gdb working properly. I've never had issues with it, but I use a custom version of gdb with the D patches applied, as well as a compiler built with debug symbols, and the runtime/other libraries built with them too in most cases.
Feb 24 2010
parent reply Ellery Newcomer <ellery-newcomer utulsa.edu> writes:
On 02/24/2010 12:37 PM, Robert Clipsham wrote:
 On 24/02/10 17:51, Ellery Newcomer wrote:
 ----
 import tango.core.tools.TraceExceptions;
 ----

 If you want to use gdb then type 'b _d_throw_exception' (or 'b _d_throw'
 for dmd) before you run your app. This will break on every exception
 thrown, so you may have to hit 'c' a few times to continue at each
 thrown exception until you find the one you need.

Thanks! b _d_throw gives me Function "_d_throw" not defined. same for _d_throw_exception. I can get a breakpoint on _d_arraycopy, but there seem to be way too many calls for it to be useful.

Hmm, that's odd... if you type b _d_t<tab> or b _d_<tab> then you should get a list of runtime functions, do you see anything listed there that could be related? It seems odd to me that that function isn't there, it always is for me. I'm pretty sure I use a debug version of the runtime though, so that could be it. Your best option is probably to use Tango's built in stack tracing for now if you can't get gdb working properly. I've never had issues with it, but I use a custom version of gdb with the D patches applied, as well as a compiler built with debug symbols, and the runtime/other libraries built with them too in most cases.

Oooh! nice trick! Ah, it's '_d_throw 4' and quotes help. Yahoo! Do I need to do anything special to get stack tracing to work? when I try to compile a simple program it barfs on me and gives undefined reference to `dladdr' from import tango.core.tools.TraceExceptions; void main(){ int[] i = [1,2]; int[] j = new int[3]; j[] = i[]; } oh well. Thanks a ton, I'm back in business now!
Feb 24 2010
next sibling parent Robert Clipsham <robert octarineparrot.com> writes:
On 24/02/10 20:20, Ellery Newcomer wrote:
 Oooh! nice trick!
 Ah, it's '_d_throw 4' and quotes help. Yahoo!


 Do I need to do anything special to get stack tracing to work? when I
 try to compile a simple program it barfs on me and gives

 undefined reference to `dladdr'

 from

 import tango.core.tools.TraceExceptions;

 void main(){
 int[] i = [1,2];
 int[] j = new int[3];
 j[] = i[];
 }

 oh well. Thanks a ton, I'm back in business now!

Add -L-ldl to your command line when compiling, it should be linked in anyway, apparently it isn't though. You may have to put it before tango in your command line, maybe not... if it doesn't work, play with its position until it does.
Feb 24 2010
prev sibling parent grauzone <none example.net> writes:
Ellery Newcomer wrote:
 On 02/24/2010 12:37 PM, Robert Clipsham wrote:
 On 24/02/10 17:51, Ellery Newcomer wrote:
 ----
 import tango.core.tools.TraceExceptions;
 ----

 If you want to use gdb then type 'b _d_throw_exception' (or 'b 
 _d_throw'
 for dmd) before you run your app. This will break on every exception
 thrown, so you may have to hit 'c' a few times to continue at each
 thrown exception until you find the one you need.

Thanks! b _d_throw gives me Function "_d_throw" not defined. same for _d_throw_exception. I can get a breakpoint on _d_arraycopy, but there seem to be way too many calls for it to be useful.

Hmm, that's odd... if you type b _d_t<tab> or b _d_<tab> then you should get a list of runtime functions, do you see anything listed there that could be related? It seems odd to me that that function isn't there, it always is for me. I'm pretty sure I use a debug version of the runtime though, so that could be it. Your best option is probably to use Tango's built in stack tracing for now if you can't get gdb working properly. I've never had issues with it, but I use a custom version of gdb with the D patches applied, as well as a compiler built with debug symbols, and the runtime/other libraries built with them too in most cases.

Oooh! nice trick! Ah, it's '_d_throw 4' and quotes help. Yahoo!

By the way, that's because someone defined _d_throw to have Windows calling convention, even on Linux. I wonder what that's useful for.
 
 Do I need to do anything special to get stack tracing to work? when I 
 try to compile a simple program it barfs on me and gives
 
 undefined reference to `dladdr'
 
 from
 
 import tango.core.tools.TraceExceptions;

You must link to libdl (-ldl).
 void main(){
 int[] i = [1,2];
 int[]  j = new int[3];
 j[] = i[];
 }
 
 oh well. Thanks a ton, I'm back in business now!

Feb 25 2010
prev sibling next sibling parent bearophile <bearophileHUGS lycos.com> writes:
Ellery Newcomer:
 I want line numbers

You can file a low priority bug request on this then. Bye, bearophile
Feb 24 2010
prev sibling parent bearophile <bearophileHUGS lycos.com> writes:
Ellery Newcomer:
 I want line numbers

http://d.puremagic.com/issues/show_bug.cgi?id=3851 Bye, bearophile
Feb 24 2010