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1# Debugging vs Code plugin and the Language Server 1# Debugging VSCode plugin and the language server
2 2
3**NOTE:** the information here is mostly obsolete 3## Prerequisites
4 4
5Install [LLDB](https://lldb.llvm.org/) and the [LLDB Extension](https://marketplace.visualstudio.com/items?itemName=vadimcn.vscode-lldb). 5- Install [LLDB](https://lldb.llvm.org/) and the [LLDB Extension](https://marketplace.visualstudio.com/items?itemName=vadimcn.vscode-lldb).
6- Open the root folder in VSCode. Here you can access the preconfigured debug setups.
6 7
7Checkout rust rust-analyzer and open it in vscode. 8 <img height=150px src="https://user-images.githubusercontent.com/36276403/74611090-92ec5380-5101-11ea-8a41-598f51f3f3e3.png" alt="Debug options view">
9
10- Install all TypeScript dependencies
11 ```bash
12 cd editors/code
13 npm install
14 ```
15
16## Common knowledge
17
18* All debug configurations open a new `[Extension Development Host]` VSCode instance
19where **only** the `rust-analyzer` extension being debugged is enabled.
20* To activate the extension you need to open any Rust project folder in `[Extension Development Host]`.
8 21
9```
10$ git clone https://github.com/rust-analyzer/rust-analyzer.git --depth 1
11$ cd rust-analyzer
12$ code .
13```
14 22
15- To attach to the `lsp server` in linux you'll have to run: 23## Debug TypeScript VSCode extension
16 24
17 `echo 0 | sudo tee /proc/sys/kernel/yama/ptrace_scope` 25- `Run Extension` - runs the extension with the globally installed `ra_lsp_server` binary.
26- `Run Extension (Dev Server)` - runs extension with the locally built LSP server (`target/debug/ra_lsp_server`).
27
28TypeScript debugging is configured to watch your source edits and recompile.
29To apply changes to an already running debug process press <kbd>Ctrl+Shift+P</kbd> and run the following command in your `[Extension Development Host]`
30
31```
32> Developer: Reload Window
33```
18 34
19 This enables ptrace on non forked processes 35## Debug Rust LSP server
20 36
21- Ensure the dependencies for the extension are installed, run the `npm: install - editors/code` task in vscode. 37- When attaching a debugger to an already running `rust-analyzer` server on Linux you might need to enable `ptrace` for unrelated processes by running:
22 38
23- Launch the `Debug Extension`, this will build the extension and the `lsp server`. 39 ```
40 echo 0 | sudo tee /proc/sys/kernel/yama/ptrace_scope
41 ```
24 42
25- A new instance of vscode with `[Extension Development Host]` in the title.
26 43
27 Don't worry about disabling `rls` all other extensions will be disabled but this one. 44- By default, the LSP server is built without debug information. To enable it, you'll need to change `Cargo.toml`:
45 ```toml
46 [profile.dev]
47 debug = 2
48 ```
28 49
29- In the new vscode instance open a rust project, and navigate to a rust file 50- Select `Run Extension (Dev Server)` to run your locally built `target/debug/ra_lsp_server`.
30 51
31- In the original vscode start an additional debug session (the three periods in the launch) and select `Debug Lsp Server`. 52- In the original VSCode window once again select the `Attach To Server` debug configuration.
32 53
33- A list of running processes should appear select the `ra_lsp_server` from this repo. 54- A list of running processes should appear. Select the `ra_lsp_server` from this repo.
34 55
35- Navigate to `crates/ra_lsp_server/src/main_loop.rs` and add a breakpoint to the `on_task` function. 56- Navigate to `crates/ra_lsp_server/src/main_loop.rs` and add a breakpoint to the `on_task` function.
36 57
37- Go back to the `[Extension Development Host]` instance and hover over a rust variable and your breakpoint should hit. 58- Go back to the `[Extension Development Host]` instance and hover over a Rust variable and your breakpoint should hit.
38 59
39## Demo 60## Demo
40 61
41![demonstration of debugging](https://user-images.githubusercontent.com/1711539/51384036-254fab80-1b2c-11e9-824d-95f9a6e9cf4f.gif) 62- [Debugging TypeScript VScode extension](https://www.youtube.com/watch?v=T-hvpK6s4wM).
63- [Debugging Rust LSP server](https://www.youtube.com/watch?v=EaNb5rg4E0M).
42 64
43## Troubleshooting 65## Troubleshooting
44 66