Re: GDB + ddemangle

[Basile B. via Digitalmars-d-announce]

On Friday, 26 April 2019 at 07:08:45 UTC, Arun Chandrasekaran 
wrote:

On Friday, 20 April 2018 at 17:55:12 UTC, Iain Buclaw wrote:
On 20 April 2018 at 17:40, drug via Digitalmars-d-announce 
 wrote:

20.04.2018 16:49, Iain Buclaw пишет:

[...]
it works, thank you. But not in all cases. For example when 
gdb stops on breakpoint it demangle, but if I do `bt` - 
backtrace isn't demangled.


Using a compiler that implements 2.077 or later (IIRC) 
probably won't, due to gdb being too old.  They broke ABI by 
introducing back referencing, no release of gdb supports that 
yet.


This stays broken after 1 year. How do we fix this?


I recognize your name from IRC, where you posted a related 
question yesterday.

The person in charge for D in GDB had answered:

The problem is that the mangling scheme has changed (to produce 
shorter mangles). Demangling will be eventually supported when D 
will be in GCC for good (GCC 10) and then he would port the 
demangling from GCC to GDB.


So for now demangling of D in GDB only work if the binary is 
compiled with a very old version of the compiler, i.e prior to 
the new mangling method.

Re: GDB + ddemangle

[Arun Chandrasekaran via Digitalmars-d-announce]

On Friday, 20 April 2018 at 17:55:12 UTC, Iain Buclaw wrote:
On 20 April 2018 at 17:40, drug via Digitalmars-d-announce 
 wrote:

20.04.2018 16:49, Iain Buclaw пишет:

[...]
it works, thank you. But not in all cases. For example when 
gdb stops on breakpoint it demangle, but if I do `bt` - 
backtrace isn't demangled.


Using a compiler that implements 2.077 or later (IIRC) probably 
won't, due to gdb being too old.  They broke ABI by introducing 
back referencing, no release of gdb supports that yet.


This stays broken after 1 year. How do we fix this?

Re: GDB + ddemangle

[ANtlord via Digitalmars-d-announce]

On Wednesday, 25 April 2018 at 05:12:37 UTC, Joakim wrote:

On Wednesday, 25 April 2018 at 05:09:28 UTC, ANtlord wrote:

On Friday, 20 April 2018 at 17:55:12 UTC, Iain Buclaw wrote:
On 20 April 2018 at 17:40, drug via Digitalmars-d-announce 
 wrote:


Using a compiler that implements 2.077 or later (IIRC) 
probably won't, due to gdb being too old.  They broke ABI by 
introducing back referencing, no release of gdb supports that 
yet.


I launched gdb with command `gdb -ex 'set lang d' test` 
disabling my plugin and I don't see demangling anywhere. 
Source file is compiled with command `dmd -g test.d`


DMD 2.079
GDB 8.1

Did I miss something?


Yes, read two posts back, by Iain.


My bad. I wasn't aware on the morning. I mess the sentence
They broke ABI by introducing back referencing, no release of 
gdb supports that yet

Re: GDB + ddemangle

[Joakim via Digitalmars-d-announce]

On Wednesday, 25 April 2018 at 05:09:28 UTC, ANtlord wrote:

On Friday, 20 April 2018 at 17:55:12 UTC, Iain Buclaw wrote:
On 20 April 2018 at 17:40, drug via Digitalmars-d-announce 
 wrote:


Using a compiler that implements 2.077 or later (IIRC) 
probably won't, due to gdb being too old.  They broke ABI by 
introducing back referencing, no release of gdb supports that 
yet.


I launched gdb with command `gdb -ex 'set lang d' test` 
disabling my plugin and I don't see demangling anywhere. Source 
file is compiled with command `dmd -g test.d`


DMD 2.079
GDB 8.1

Did I miss something?


Yes, read two posts back, by Iain.

Re: GDB + ddemangle

[ANtlord via Digitalmars-d-announce]

On Friday, 20 April 2018 at 17:55:12 UTC, Iain Buclaw wrote:
On 20 April 2018 at 17:40, drug via Digitalmars-d-announce 
 wrote:


Using a compiler that implements 2.077 or later (IIRC) probably 
won't, due to gdb being too old.  They broke ABI by introducing 
back referencing, no release of gdb supports that yet.


I launched gdb with command `gdb -ex 'set lang d' test` disabling 
my plugin and I don't see demangling anywhere. Source file is 
compiled with command `dmd -g test.d`


DMD 2.079
GDB 8.1

Did I miss something?

Re: GDB + ddemangle

[drug via Digitalmars-d-announce]

20.04.2018 20:55, Iain Buclaw пишет:


Using a compiler that implements 2.077 or later (IIRC) probably won't,
due to gdb being too old.  They broke ABI by introducing back
referencing, no release of gdb supports that yet.


I see. Thanks for clarification.

Aren't plugins for gdb like subj more simple way to extend dlang support 
in gdb then?

Re: GDB + ddemangle

[Iain Buclaw via Digitalmars-d-announce]

On 20 April 2018 at 17:40, drug via Digitalmars-d-announce
 wrote:
> 20.04.2018 16:49, Iain Buclaw пишет:
>>
>>
>> GDB auto-detects the language based on DW_LANG tag in the debug info.
>>
>> If you are starting up gdb without a program to debug, you can
>> explicitly switch with: set lang d
>> Then try something like: demangle _D3fooFiZv
>>
>> Or if you want it to start up in D mode: gdb -ex 'set lang d'
>>
> it works, thank you. But not in all cases. For example when gdb stops on
> breakpoint it demangle, but if I do `bt` - backtrace isn't demangled.

Using a compiler that implements 2.077 or later (IIRC) probably won't,
due to gdb being too old.  They broke ABI by introducing back
referencing, no release of gdb supports that yet.

Re: GDB + ddemangle

[drug via Digitalmars-d-announce]

20.04.2018 16:49, Iain Buclaw пишет:


GDB auto-detects the language based on DW_LANG tag in the debug info.

If you are starting up gdb without a program to debug, you can
explicitly switch with: set lang d
Then try something like: demangle _D3fooFiZv

Or if you want it to start up in D mode: gdb -ex 'set lang d'

it works, thank you. But not in all cases. For example when gdb stops on 
breakpoint it demangle, but if I do `bt` - backtrace isn't demangled.

Re: GDB + ddemangle

[Iain Buclaw via Digitalmars-d-announce]

On 20 April 2018 at 14:54, drug via Digitalmars-d-announce
 wrote:
> 20.04.2018 15:36, Mike Franklin пишет:
>
>> On Friday, 20 April 2018 at 10:36:25 UTC, drug wrote:
>>>
>>> 20.04.2018 13:03, Joakim пишет:


 You are aware that gdb has built-in support for demangling D for 3-4
 years now?

>>> But how to enable it? It doesn't work out of box at least for me.
>>
>>
>> I believe you enable it with `-demangle=dlang`
>>
>> The original announcement is here:
>> https://forum.dlang.org/post/rvoqllpimfskvlabp...@forum.dlang.org
>>
>> There are a few posts on the forum with some example usages:
>> https://forum.dlang.org/search?q=%22demangle%3Ddlang%22=1
>>
>> Mike
>
> thanks for reply! but gdb don't recognize this option - unknown option
> "--demangle=dlang"
>
> ```
> $gdb --version
> GNU gdb (Debian 7.12-6) 7.12.0.20161007-git
> Copyright (C) 2016 Free Software Foundation, Inc.
> ...
> ```
>
> Or it is intended to work only using `objdump` etc?


GDB auto-detects the language based on DW_LANG tag in the debug info.

If you are starting up gdb without a program to debug, you can
explicitly switch with: set lang d
Then try something like: demangle _D3fooFiZv

Or if you want it to start up in D mode: gdb -ex 'set lang d'

Re: GDB + ddemangle

[drug via Digitalmars-d-announce]

20.04.2018 15:36, Mike Franklin пишет:

On Friday, 20 April 2018 at 10:36:25 UTC, drug wrote:

20.04.2018 13:03, Joakim пишет:


You are aware that gdb has built-in support for demangling D for 3-4 
years now?



But how to enable it? It doesn't work out of box at least for me.


I believe you enable it with `-demangle=dlang`

The original announcement is here: 
https://forum.dlang.org/post/rvoqllpimfskvlabp...@forum.dlang.org


There are a few posts on the forum with some example usages: 
https://forum.dlang.org/search?q=%22demangle%3Ddlang%22=1


Mike
thanks for reply! but gdb don't recognize this option - unknown option 
"--demangle=dlang"


```
$gdb --version
GNU gdb (Debian 7.12-6) 7.12.0.20161007-git
Copyright (C) 2016 Free Software Foundation, Inc.
...
```

Or it is intended to work only using `objdump` etc?

Re: GDB + ddemangle

[Basile B. via Digitalmars-d-announce]

On Friday, 20 April 2018 at 12:28:03 UTC, Basile B. wrote:

On Friday, 20 April 2018 at 11:06:47 UTC, Mike Wey wrote:

On 20-04-18 12:36, drug wrote:

20.04.2018 13:03, Joakim пишет:


You are aware that gdb has built-in support for demangling D 
for 3-4 years now?


But how to enable it? It doesn't work out of box at least for 
me.


It should be automatic when the executable is build with 
debugging info. `-g`


it is not, clearly ;)


The problem is that one also needs to process the compiler output 
in an IDE, so finally it doesn't change anything to anything

Re: GDB + ddemangle

[Mike Franklin via Digitalmars-d-announce]

On Friday, 20 April 2018 at 10:36:25 UTC, drug wrote:

20.04.2018 13:03, Joakim пишет:


You are aware that gdb has built-in support for demangling D 
for 3-4 years now?


But how to enable it? It doesn't work out of box at least for 
me.


I believe you enable it with `-demangle=dlang`

The original announcement is here:  
https://forum.dlang.org/post/rvoqllpimfskvlabp...@forum.dlang.org


There are a few posts on the forum with some example usages:  
https://forum.dlang.org/search?q=%22demangle%3Ddlang%22=1


Mike

Re: GDB + ddemangle

[Basile B. via Digitalmars-d-announce]

On Friday, 20 April 2018 at 11:06:47 UTC, Mike Wey wrote:

On 20-04-18 12:36, drug wrote:

20.04.2018 13:03, Joakim пишет:


You are aware that gdb has built-in support for demangling D 
for 3-4 years now?


But how to enable it? It doesn't work out of box at least for 
me.


It should be automatic when the executable is build with 
debugging info. `-g`


it is not, clearly ;)

Re: GDB + ddemangle

[drug via Digitalmars-d-announce]

20.04.2018 14:06, Mike Wey пишет:

On 20-04-18 12:36, drug wrote:

20.04.2018 13:03, Joakim пишет:


You are aware that gdb has built-in support for demangling D for 3-4 
years now?



But how to enable it? It doesn't work out of box at least for me.


It should be automatic when the executable is build with debugging info. 
`-g`


is there a way to check feature availability? What version gdb should 
have etc?

Re: GDB + ddemangle

[Mike Wey via Digitalmars-d-announce]

On 20-04-18 12:36, drug wrote:

20.04.2018 13:03, Joakim пишет:


You are aware that gdb has built-in support for demangling D for 3-4 
years now?



But how to enable it? It doesn't work out of box at least for me.


It should be automatic when the executable is build with debugging info. 
`-g`


--
Mike Wey

Re: GDB + ddemangle

[drug via Digitalmars-d-announce]

20.04.2018 13:03, Joakim пишет:


You are aware that gdb has built-in support for demangling D for 3-4 
years now?



But how to enable it? It doesn't work out of box at least for me.

Re: GDB + ddemangle

[Basile B. via Digitalmars-d-announce]

On Friday, 20 April 2018 at 10:03:53 UTC, Joakim wrote:

On Thursday, 19 April 2018 at 12:43:36 UTC, ANtlord wrote:
Hello! I've written a piece of glue code that helps to debug D 
code using GDB. The code glues together GDB and ddmangle. 
Checkout the link https://github.com/ANtlord/gdb-ddemangle


PRs are welcome!


You are aware that gdb has built-in support for demangling D 
for 3-4 years now?


I've been told this too, not so long ago, but actually i still 
feed GDB output with ddemangle too (for Coedit 'GDB commander' 
widget).

Re: GDB + ddemangle

[Joakim via Digitalmars-d-announce]

On Thursday, 19 April 2018 at 12:43:36 UTC, ANtlord wrote:
Hello! I've written a piece of glue code that helps to debug D 
code using GDB. The code glues together GDB and ddmangle. 
Checkout the link https://github.com/ANtlord/gdb-ddemangle


PRs are welcome!


You are aware that gdb has built-in support for demangling D for 
3-4 years now?


http://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git=search=HEAD=commit=ibuclaw

I don't know if Iain got all his patches in, but it demangles a 
lot of symbols for me already. However, I just started using the 
new lldb package in Termux, and I do miss it there. Otherwise, 
lldb is very nice and much more stable for me on 64-bit ARM.

Re: GDB + ddemangle

[Craig Dillabaugh via Digitalmars-d-announce]

On Thursday, 19 April 2018 at 12:43:36 UTC, ANtlord wrote:
Hello! I've written a piece of glue code that helps to debug D 
code using GDB. The code glues together GDB and ddmangle. 
Checkout the link https://github.com/ANtlord/gdb-ddemangle


PRs are welcome!


Nice work.