From e27924a2d3a873de4ded1aed572ffef61aeb0a34 Mon Sep 17 00:00:00 2001
From: little Kitchen <55852668+littleKitchen@users.noreply.github.com>
Date: Wed, 4 Feb 2026 01:44:42 -0800
Subject: [PATCH] Auto-detect Rust for CodeLLDB panic breakpoints (#48236)

Fixes #48231

## Problem
When debugging Rust programs with CodeLLDB, panic breakpoints ("Rust: on
panic") don't work unless `sourceLanguages: ["rust"]` is explicitly set
in the debug configuration.

Without this setting, CodeLLDB doesn't return the `rust_panic` exception
filter, so the breakpoint shows `locations = 0 (pending)` and never
triggers.

## Root Cause
The Cargo locator correctly adds `sourceLanguages: ["rust"]`
([cargo.rs:97-100](https://github.com/zed-industries/zed/blob/main/crates/project/src/debugger/locators/cargo.rs#L97-L100)),
but other code paths may not:
- VSCode launch.json imports
- Manual debug configurations

## Solution
Auto-detect Rust binaries in `CodeLldbDebugAdapter::get_binary()` by
checking if the program path contains `/target/debug/` or
`/target/release/` (Cargo's standard output directories).

If detected and `sourceLanguages` isn't already set, we automatically
add `["rust"]`.

Release Notes:

- Fixed Rust panic breakpoints not working in debugger when using
CodeLLDB with non-Cargo debug configurations
---
 crates/dap_adapters/src/codelldb.rs | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/crates/dap_adapters/src/codelldb.rs b/crates/dap_adapters/src/codelldb.rs
index 05aca2225aa9f0fd2a7fb4c5c1f213372f6ce899..6c9dc0d49f95717cd0309a6bd715ef73c669fb76 100644
--- a/crates/dap_adapters/src/codelldb.rs
+++ b/crates/dap_adapters/src/codelldb.rs
@@ -380,6 +380,21 @@ impl DebugAdapter for CodeLldbDebugAdapter {
         };
         let mut json_config = config.config.clone();
 
+        // Auto-detect Rust projects and add sourceLanguages if not present.
+        // This enables panic breakpoints to work correctly with CodeLLDB.
+        if let Some(config_obj) = json_config.as_object_mut() {
+            if !config_obj.contains_key("sourceLanguages") {
+                // Check if this looks like a Rust binary (Cargo build output)
+                if let Some(program) = config_obj.get("program").and_then(|p| p.as_str()) {
+                    let path_str = program.replace('\\', "/");
+                    if path_str.contains("/target/debug/") || path_str.contains("/target/release/")
+                    {
+                        config_obj.insert("sourceLanguages".to_owned(), json!(["rust"]));
+                    }
+                }
+            }
+        }
+
         Ok(DebugAdapterBinary {
             command: Some(command.unwrap()),
             cwd: Some(delegate.worktree_root_path().to_path_buf()),