Developer forums (C::B DEVELOPMENT STRICTLY!) > Plugins development
LLDB debugger low level interface investigation results
AndrewCot:
I have looked at the DAP and it looks like the way to go as once implemented will then allow C::B to support in theory all of the debuggers listed on the following page: https://microsoft.github.io/debug-adapter-protocol/implementors/adapters/
Now comes the hard part, where to start over the next week and then restart and hopefully get a handle on the work I hope.
killerbot:
Hi Eran
many thanks for the information
very much appreciated :)
Cheers
BlueHazzard:
--- Quote from: AndrewCot on April 16, 2022, 05:10:31 am ---I have looked at the DAP and it looks like the way to go as once implemented will then allow C::B to support in theory all of the debuggers listed on the following page: https://microsoft.github.io/debug-adapter-protocol/implementors/adapters/
Now comes the hard part, where to start over the next week and then restart and hopefully get a handle on the work I hope.
--- End quote ---
Have you found an gdb server? I am quite confused with the architecture or more, where to get the debugger servers. Are thy embedded in VS code and not stand alone?
AndrewCot:
I am playing with the following library/libraries to plug the DAP interface code hole:
https://github.com/google/cppdap
https://github.com/stoianmihail/cppdap-debugger
I am using the following DAP LLDB adapter for testing:
https://github.com/vadimcn/vscode-lldb
You will need to extract the https://github.com/vadimcn/vscode-lldb/releases/download/v1.7.0/codelldb-x86_64-windows.vsix file using 7zip. I run the adapter using the following command:
--- Code: ---adapter\codelldb --port 12345
--- End code ---
I have not looked at how VSCode starts the different DAP adapters as I want to get something "working" first. "Working" is load an exe, set a break point on a line, run and hit the break point then run to the end of the hello world type app.
Attached in the 7z is my sample test project inc source that has a a hacked source code sample (LLDB_Client_Test.cpp) that uses bits from both github "cppdap" repos, but the launch step does not return or show anything. It does show the DAP adapter initialize request results, so at least I know the app and DAP adapter are communicating.
The following is a quick guide to build the cppdap library using MSYS2:
The Code::Blocks Debugger Application Protocol debugger plugin uses the following libraries:
* https://github.com/google/cppdap
Use the following steps to build the cppdap library using MSYS2:
1. Clone the repo using the following command:
* git clone --recurse-submodules https://github.com/google/cppdap
2. Generate the makefile:
bash
cd <path-to-cppdap>
mkdir build
cd build
cmake .. -G "MSYS Makefiles"
3. Finally, build the project:
make
P.S. One thing I spotted yesterday that I need to get my head around is that the DAP protocol launch request spec as it has the following in the spec, so then it makes the IDE only able to launch DAP adapters that it knows about as the launch arguments are specific to the DAP adapter.... I hope this is not the case, but this definitely needs more investigation to see how the launch request is implemented in IDE's.
"Since launching is debugger/runtime specific, the arguments for this request are not part of this specification."
Hope this is helpful.
eranif:
A quick update on this subject:
Since our chat here, I revived my 2 years old project "dbgd"
My goal was to create dap-gdb and dap-client, due to lack of time I paused my work on that.
Recently, I moved to develop full time on Mac and I needed a better lldb support (replacing my current lldb implementation which uses liblldb.dylib directly)
So with small effort I made dapcxx library that it built for wxWidgets.
All the interaction is done via events, i.e. whenever a an event / response arrives from the dap server, the GUI is notified via event (all the reads are done in a background thread)
You can check it out here:
https://github.com/eranif/dbgd -> it is a complete standalone library with zero dependencies (other than wxWidgets)
It comes with a small UI that demonstrate how to use it
The DAP server initialization is done here:
https://github.com/eranif/dbgd/blob/master/dbgcli/MainFrame.cpp#L59
PS:
You can install lldb-vscode from MSYS2 to try it out
Hope you will find it useful for your purposes
Eran
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