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docs: update debugging.md with the freshest VSCode debugging information

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Veetaha 2020-02-16 22:58:17 +02:00
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docs/dev/debugging.md
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# Debugging vs Code plugin and the Language Server
Install [LLDB](https://lldb.llvm.org/) and the [LLDB Extension](https://marketplace.visualstudio.com/items?itemName=vadimcn.vscode-lldb).
## Prerequsities
Checkout rust rust-analyzer and open it in vscode.
- Install [LLDB](https://lldb.llvm.org/) and the [LLDB Extension](https://marketplace.visualstudio.com/items?itemName=vadimcn.vscode-lldb) VSCode extensions.
- Open the root folder in VSCode. Here you can access the preconfigured debug setups.
<img height=150px src="https://user-images.githubusercontent.com/36276403/74611090-92ec5380-5101-11ea-8a41-598f51f3f3e3.png" alt="Debug options view">
- Install all TypeScript dependencies
```bash
cd editors/code
npm i
```
## Common knowledge
* All debug configurations open new `[Extension Development Host]` VSCode instance
where **only** your `rust-analyzer` extension is enabled.
* To activate the extension you need to open any Rust project folder in `[Extension Development Host]`.
## Debug TypeScript VSCode extension
- `Run Extension` - runs the extension with globally installed `ra_lsp_server` binary.
- `Run Extension (Dev Server)` - runs extension with binary from your locally built `target/debug/ra_lsp_server`.
TypeScript debugging is configured to watch your source edits and recompile.
To apply changes to already running debug process press <kbd>Ctrl+Shift+P</kbd> and run the following command in your `[Extension Development Host]`
```
$ git clone https://github.com/rust-analyzer/rust-analyzer.git --depth 1
$ cd rust-analyzer
$ code .
> Developer: Reload Window
```
## Debug Rust LSP server
- To attach to the `lsp server` in linux you'll have to run:
`echo 0 | sudo tee /proc/sys/kernel/yama/ptrace_scope`
```
echo 0 | sudo tee /proc/sys/kernel/yama/ptrace_scope
```
This enables ptrace on non forked processes
This enables ptrace on non-forked processes
- Ensure the dependencies for the extension are installed, run the `npm: install - editors/code` task in vscode.
- Enable debug symbols in `Cargo.toml`:
```toml
[profile.dev]
debug = 2
```
- Launch the `Debug Extension`, this will build the extension and the `lsp server`.
- Select `Run Extension (Dev Server)` to run your local built `target/debug/ra_lsp_server`.
- A new instance of vscode with `[Extension Development Host]` in the title.
- In the original VSCode window once again select `Attach To Server` debug configuration.
Don't worry about disabling `rls` all other extensions will be disabled but this one.
- In the new vscode instance open a rust project, and navigate to a rust file
- In the original vscode start an additional debug session (the three periods in the launch) and select `Debug Lsp Server`.
- A list of running processes should appear select the `ra_lsp_server` from this repo.
- A list of running processes should appear. Select the `ra_lsp_server` from this repo.
- Navigate to `crates/ra_lsp_server/src/main_loop.rs` and add a breakpoint to the `on_task` function.
@ -36,7 +60,8 @@ $ code .
## Demo
![demonstration of debugging](https://user-images.githubusercontent.com/1711539/51384036-254fab80-1b2c-11e9-824d-95f9a6e9cf4f.gif)
- [Debugging TypeScript VScode extension](https://www.youtube.com/watch?v=T-hvpK6s4wM).
- [Debugging Rust LSP server](https://www.youtube.com/watch?v=EaNb5rg4E0M).
## Troubleshooting