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digitalmars.D.announce - Debugging improvements - Visual Studio Natvis, GDB, LLDB

reply WebFreak001 <d.forum webfreak.org> writes:
I have created editor independent pretty printers / visualization 
files for Visual Studio's debugger\*, GDB and LLDB.

The script and setup guide are available here: 
https://github.com/Pure-D/dlang-debug

If you want to, please try them out, they make each of the 
debuggers a lot more capable at debugging D! If you find any bugs 
or tested what is untested in the README, please consider opening 
issues / making PRs.

The files all add support for:
- string/wstring/dstring (GDB and VSDBG take length as max 
length, LLDB can actually read over null bytes)
- arrays (LDC, partially with DMD)
- associative arrays (LDC, very partially with DMD)

These debug configurations have been tested with VSCode and will 
all be bundled with next code-d release. An alpha can be found on 
Discord. Other editors will also work, Visual Studio can also use 
the Natvis file.

Additionally these scripts could be used to add debugging support 
to standard library types / popular data types. If you have ideas 
for some you commonly use and want to debug, post a reply here or 
make an issue.

\*: only when program is compiled with -gc
Apr 06 2021
next sibling parent reply Dennis <dkorpel gmail.com> writes:
On Tuesday, 6 April 2021 at 21:04:47 UTC, WebFreak001 wrote:

 I have created editor independent pretty printers / 
 visualization files for Visual Studio's debugger\*, GDB and 
 LLDB.

 The script and setup guide are available here: 
 https://github.com/Pure-D/dlang-debug


This is great. Pretty-printing of associative arrays is a pretty 
big deal!

I'm having problems setting it up though.

You say the configuration is bundled since code-d 0.23.0 but the 
newest version VSCode lets me select is `0.22.0 (1 year ago)`.
When manually adding the script in `setupCommands` of my cppdbg 
configuration:

```
{
	"description": "Load D GDB type extensions",
	"ignoreFailures": false,
	"text": "-interpreter-exec console \"source 
/path/to/gdb_dlang.py\""
}
```

It said `Undefined command: "import"` referring to line 1 `import 
gdb.printing`. It looks like it's interpreting `gdb_dlang.py` as 
a shell script, so I changed `source` to `python`, which gives 
the error "Python scripting is not supported in this copy of GDB".
I have `GNU gdb (Debian 8.2.1-2+b3) 8.2.1`.

Maybe my version is too old (I'm used to that on Debian), or I 
need to install some other module. I'll look into it later.
Apr 23 2021
parent WebFreak001 <d.forum webfreak.org> writes:
On Friday, 23 April 2021 at 20:05:30 UTC, Dennis wrote:

 On Tuesday, 6 April 2021 at 21:04:47 UTC, WebFreak001 wrote:

 I have created editor independent pretty printers / 
 visualization files for Visual Studio's debugger\*, GDB and 
 LLDB.

 The script and setup guide are available here: 
 https://github.com/Pure-D/dlang-debug


 This is great. Pretty-printing of associative arrays is a 
 pretty big deal!

 I'm having problems setting it up though.

 You say the configuration is bundled since code-d 0.23.0 but 
 the newest version VSCode lets me select is `0.22.0 (1 year 
 ago)`.


yeah the readme is already written assuming I release the new 
code-d release finally. Currently you still need to do it 
manually.


 When manually adding the script in `setupCommands` of my cppdbg 
 configuration:

 ```
 {
 	"description": "Load D GDB type extensions",
 	"ignoreFailures": false,
 	"text": "-interpreter-exec console \"source 
 /path/to/gdb_dlang.py\""
 }
 ```

 It said `Undefined command: "import"` referring to line 1 
 `import gdb.printing`. It looks like it's interpreting 
 `gdb_dlang.py` as a shell script, so I changed `source` to 
 `python`, which gives the error "Python scripting is not 
 supported in this copy of GDB".
 I have `GNU gdb (Debian 8.2.1-2+b3) 8.2.1`.

 Maybe my version is too old (I'm used to that on Debian), or I 
 need to install some other module. I'll look into it later.


oh that's not good, I just saw it's only enabled when built with 
python support, so some package maintainers might not choose to 
do so. Considering this is the only real way to get this working 
however I don't think I have another choice than assume the user 
has a GDB with python enabled.
Apr 23 2021
prev sibling next sibling parent reply mw <mingwu gmail.com> writes:
On Tuesday, 6 April 2021 at 21:04:47 UTC, WebFreak001 wrote:

 I have created editor independent pretty printers / 
 visualization files for Visual Studio's debugger\*, GDB and 
 LLDB.

 The script and setup guide are available here: 
 https://github.com/Pure-D/dlang-debug


where to input this command? from gdb command line? or in 
.gdbinit?

```
-enable-pretty-printing
-interpreter-exec console "source /path/to/gdb_dlang.py"
```

(sorry, I googled a bit, but didn't find the answer).
Apr 23 2021
parent reply WebFreak001 <d.forum webfreak.org> writes:
On Friday, 23 April 2021 at 23:54:21 UTC, mw wrote:

 On Tuesday, 6 April 2021 at 21:04:47 UTC, WebFreak001 wrote:

 I have created editor independent pretty printers / 
 visualization files for Visual Studio's debugger\*, GDB and 
 LLDB.

 The script and setup guide are available here: 
 https://github.com/Pure-D/dlang-debug


 where to input this command? from gdb command line? or in 
 .gdbinit?

 ```
 -enable-pretty-printing
 -interpreter-exec console "source /path/to/gdb_dlang.py"
 ```

 (sorry, I googled a bit, but didn't find the answer).


those are GDB-MI commands. If you can only run GDB console 
commands you can use

```
source /path/to/gdb_dlang.py
enable pretty-printer
```
Apr 24 2021
parent reply mw <mingwu gmail.com> writes:
On Saturday, 24 April 2021 at 16:08:07 UTC, WebFreak001 wrote:

 those are GDB-MI commands. If you can only run GDB console 
 commands you can use

 ```
 source /path/to/gdb_dlang.py
 enable pretty-printer
 ```


Thanks, I put these 2 lines into .gdbinit, and it seems loaded.


I have a question about print AA: it only print values?

```
11	    int[int] aa = [1:2, 2:4];
(gdb) p aa
$1 = [2] = {4, 2}
(gdb) p aa[1]
Invalid binary operation specified.
```

I tried both dmd -g and ldc2 -g on Linux, both the same behavior.
Apr 24 2021
parent reply WebFreak001 <d.forum webfreak.org> writes:
On Saturday, 24 April 2021 at 17:16:48 UTC, mw wrote:

 On Saturday, 24 April 2021 at 16:08:07 UTC, WebFreak001 wrote:

 those are GDB-MI commands. If you can only run GDB console 
 commands you can use

 ```
 source /path/to/gdb_dlang.py
 enable pretty-printer
 ```


 Thanks, I put these 2 lines into .gdbinit, and it seems loaded.


 I have a question about print AA: it only print values?

 ```
 11	    int[int] aa = [1:2, 2:4];
 (gdb) p aa
 $1 = [2] = {4, 2}
 (gdb) p aa[1]
 Invalid binary operation specified.
 ```

 I tried both dmd -g and ldc2 -g on Linux, both the same 
 behavior.


I haven't modified the expression parsing behavior (I don't know 
if I can even do that), it's only pretty printers
Apr 24 2021
parent reply mw <mingwu gmail.com> writes:
On Saturday, 24 April 2021 at 17:44:39 UTC, WebFreak001 wrote:

 On Saturday, 24 April 2021 at 17:16:48 UTC, mw wrote:

 On Saturday, 24 April 2021 at 16:08:07 UTC, WebFreak001 wrote:

 those are GDB-MI commands. If you can only run GDB console 
 commands you can use

 ```
 source /path/to/gdb_dlang.py
 enable pretty-printer
 ```


 Thanks, I put these 2 lines into .gdbinit, and it seems loaded.


 I have a question about print AA: it only print values?

 ```
 11	    int[int] aa = [1:2, 2:4];
 (gdb) p aa
 $1 = [2] = {4, 2}
 (gdb) p aa[1]
 Invalid binary operation specified.
 ```

 I tried both dmd -g and ldc2 -g on Linux, both the same 
 behavior.


 I haven't modified the expression parsing behavior (I don't 
 know if I can even do that), it's only pretty printers



Why they (keys & values) are showing below in VS code?



 Incredible -- below in VS Code (with launch.json and dub.json 
 config as shown on right) I am able to see arrays, strings, and 
 associative arrays keys/values!



The implementations are different? or there are fundamental 
obstacles that cannot be done for GDB console?
Apr 24 2021
parent WebFreak001 <d.forum webfreak.org> writes:
On Saturday, 24 April 2021 at 18:59:29 UTC, mw wrote:

 On Saturday, 24 April 2021 at 17:44:39 UTC, WebFreak001 wrote:

 On Saturday, 24 April 2021 at 17:16:48 UTC, mw wrote:

 [...]


 I haven't modified the expression parsing behavior (I don't 
 know if I can even do that), it's only pretty printers



 Why they (keys & values) are showing below in VS code?



 Incredible -- below in VS Code (with launch.json and dub.json 
 config as shown on right) I am able to see arrays, strings, 
 and associative arrays keys/values!



 The implementations are different? or there are fundamental 
 obstacles that cannot be done for GDB console?


the pretty printer implements summary & children (which are keys 
and values) If you can't find a command in the console for 
listing children then it will only be able to show a summary.
Apr 24 2021
prev sibling parent reply Gavin Ray <user example.com> writes:
On Tuesday, 6 April 2021 at 21:04:47 UTC, WebFreak001 wrote:

 I have created editor independent pretty printers / 
 visualization files for Visual Studio's debugger\*, GDB and 
 LLDB.

 [...]


Incredible -- below in VS Code (with launch.json and dub.json 
config as shown on right) I am able to see arrays, strings, and 
associative arrays keys/values!

![codefreak natvis debug](https://i.imgur.com/FvcR9B9.png)
Apr 24 2021
next sibling parent Gavin Ray <user example.com> writes:
On Saturday, 24 April 2021 at 18:32:42 UTC, Gavin Ray wrote:

 On Tuesday, 6 April 2021 at 21:04:47 UTC, WebFreak001 wrote:

 I have created editor independent pretty printers / 
 visualization files for Visual Studio's debugger\*, GDB and 
 LLDB.

 [...]


 Incredible -- below in VS Code (with launch.json and dub.json 
 config as shown on right) I am able to see arrays, strings, and 
 associative arrays keys/values!


It seems that the forum CSS decides to display images without 
`display: auto` or `display: scroll` for showing a scrollbar when 
it's larger than the container dimensions.

So it's cropped the image and made the config on the right not 
visible.

**Here's a direct link to full image:**
https://i.imgur.com/FvcR9B9.png
Apr 24 2021
prev sibling parent mw <mingwu gmail.com> writes:
On Saturday, 24 April 2021 at 18:32:42 UTC, Gavin Ray wrote:

 On Tuesday, 6 April 2021 at 21:04:47 UTC, WebFreak001 wrote:

 I have created editor independent pretty printers / 
 visualization files for Visual Studio's debugger\*, GDB and 
 LLDB.

 [...]


 Incredible -- below in VS Code (with launch.json and dub.json 
 config as shown on right) I am able to see arrays, strings, and 
 associative arrays keys/values!



Are you running on Windows or Linux?
Apr 24 2021