Debug variables are showing when not in scope. Is it possible to remove them? They also show before they are actually defined in the source code.



int x = 0; < BP here, y and z are shown in the locals.

int y = 3;
{
   int z = 4;
}

// z is when when here.


One ends up with a huge list of variables of all the locals when they don't even "exist". I'm using the Mago debugger.

On 28/10/2018 18:35, Michelle Long wrote:
> Debug variables are showing when not in scope. Is it possible to remove them? They also show before they are actually defined in the source code.
> 
> 
> 
> int x = 0; < BP here, y and z are shown in the locals.
> 
> int y = 3;
> {
>    int z = 4;
> }
> 
> // z is when when here.
> 
> 
> One ends up with a huge list of variables of all the locals when they don't even "exist". I'm using the Mago debugger.

That used to work for dmd, but it seems to have regressed (still works
for try/catch blocks). IIRC LDC does not emit appropriate debug information.

On 29/10/2018 08:32, Rainer Schuetze wrote:
> 
> 
> On 28/10/2018 18:35, Michelle Long wrote:
>> Debug variables are showing when not in scope. Is it possible to remove them? They also show before they are actually defined in the source code.
>>
>>
>>
>> int x = 0; < BP here, y and z are shown in the locals.
>>
>> int y = 3;
>> {
>>    int z = 4;
>> }
>>
>> // z is when when here.
>>
>>
>> One ends up with a huge list of variables of all the locals when they don't even "exist". I'm using the Mago debugger.
> 
> That used to work for dmd, but it seems to have regressed (still works
> for try/catch blocks). IIRC LDC does not emit appropriate debug information.
> 

Sorry, I slightly misremembered. The respective debug information is
only emitted by dmd if there are multiple declarations with the same
variables in different scopes in the same function. This still works fine.

On Monday, 29 October 2018 at 07:39:14 UTC, Rainer Schuetze wrote:
>
>
> On 29/10/2018 08:32, Rainer Schuetze wrote:
>> 
>> 
>> On 28/10/2018 18:35, Michelle Long wrote:
>>> Debug variables are showing when not in scope. Is it possible to remove them? They also show before they are actually defined in the source code.
>>>
>>>
>>>
>>> int x = 0; < BP here, y and z are shown in the locals.
>>>
>>> int y = 3;
>>> {
>>>    int z = 4;
>>> }
>>>
>>> // z is when when here.
>>>
>>>
>>> One ends up with a huge list of variables of all the locals when they don't even "exist". I'm using the Mago debugger.
>> 
>> That used to work for dmd, but it seems to have regressed (still works
>> for try/catch blocks). IIRC LDC does not emit appropriate debug information.
>> 
>
> Sorry, I slightly misremembered. The respective debug information is
> only emitted by dmd if there are multiple declarations with the same
> variables in different scopes in the same function. This still works fine.

Can Visual D detect scopes while debugging? E.g., if one is at some line can it determine properly the scope of things? e.g., what symbol is in the current scope and what is not?

Or is this all up to dmd? If dmd is the cause of most of these debugging issues, should dmd give as much info as it can so the debugging experience can be optimal? It makes no sense for a compiler to make the debugging experience more difficult because debugging is naturally part of the equation.

On 30/10/2018 16:38, Michelle Long wrote:
> On Monday, 29 October 2018 at 07:39:14 UTC, Rainer Schuetze wrote:
>>
>>
>> On 29/10/2018 08:32, Rainer Schuetze wrote:
>>>
>>>
>>> On 28/10/2018 18:35, Michelle Long wrote:
>>>> Debug variables are showing when not in scope. Is it possible to remove them? They also show before they are actually defined in the source code.
>>>>
>>>>
>>>>
>>>> int x = 0; < BP here, y and z are shown in the locals.
>>>>
>>>> int y = 3;
>>>> {
>>>>    int z = 4;
>>>> }
>>>>
>>>> // z is when when here.
>>>>
>>>>
>>>> One ends up with a huge list of variables of all the locals when they don't even "exist". I'm using the Mago debugger.
>>>
>>> That used to work for dmd, but it seems to have regressed (still works for try/catch blocks). IIRC LDC does not emit appropriate debug information.
>>>
>>
>> Sorry, I slightly misremembered. The respective debug information is only emitted by dmd if there are multiple declarations with the same variables in different scopes in the same function. This still works fine.
> 
> Can Visual D detect scopes while debugging? E.g., if one is at some line can it determine properly the scope of things? e.g., what symbol is in the current scope and what is not?
> 
> Or is this all up to dmd? If dmd is the cause of most of these debugging issues, should dmd give as much info as it can so the debugging experience can be optimal? It makes no sense for a compiler to make the debugging experience more difficult because debugging is naturally part of the equation.
> 

I'd consider it a dmd issue and created an enhancement request: https://issues.dlang.org/show_bug.cgi?id=19349