Go to Definition slow

[tshcherban-wb]

Environment

• OS and Version: Windows 11 x64
• VS Code Version: 1.104.2 (also tried a few olders)
• C/C++ Extension Version: 1.27.7
• If using SSH remote, specify OS of remote machine: WSL2 (Ubuntu 24.04.2 LTS) + Devcontainer

Bug Summary and Steps to Reproduce

Bug Summary:
v1.27.7 Go to Definition takes ~2-3 seconds, while v1.26.5 works instantly.

Steps to reproduce:

1. Use Go to Definition on a moderate sized C CMake project (~400 h+c files, ~88k SLOC)
2. Fire Intellisense (Ctrl + Space) - slower compared to v1.26.5 by 1-2 seconds

Expected behavior:

Configuration and Logs

_settings.json_:

  "C_Cpp.intelliSenseEngine": "default",
  "C_Cpp.files.exclude": {
    "**/.vscode": true,
    "**/.vs": true,
    "build/**": true
  },
  "files.watcherExclude": {
    "build/**": true
  },


_c_cpp_properties.json_

{
    "configurations": [
        {
            "name": "ESP-IDF",
            "compilerPath": "${config:idf.toolsPathWin}\\tools\\xtensa-esp32s3-elf\\esp-2021r2-patch3-8.4.0\\xtensa-esp32s3-elf\\bin\\xtensa-esp32s3-elf-gcc.exe",
            "compileCommands": [
                "${workspaceFolder}/build/compile_commands.json"
            ],
            "includePath": [
                "${config:idf.espIdfPath}/components/**",
                "${config:idf.espIdfPathWin}/components/**",
                "${config:idf.espAdfPath}/components/**",
                "${config:idf.espAdfPathWin}/components/**",
                "${workspaceFolder}/**"
            ],
            "browse": {
                "path": [
                    "${config:idf.espIdfPath}/components",
                    "${config:idf.espIdfPathWin}/components",
                    "${config:idf.espAdfPath}/components/**",
                    "${config:idf.espAdfPathWin}/components/**",
                    "${workspaceFolder}"
                ],
                "limitSymbolsToIncludedHeaders": false
            }
        }
    ],
    "version": 4
}

Other Extensions

Disabling / enabling other extensions does not seem to have any effect

Additional context

No response

[sean-mcmanus]

@tshcherban-wb Do you know of a repro we can try that exhibits the performance regression? Do you repro it with a simpler workspace?

[tshcherban-wb]

Will try creating reproducible env

[sean-mcmanus]

@tshcherban-wb Also, if you could confirm:

1. Is cpptools and cpptools-srv idle before invoking Go to Def?
2. Is it slow when the definition is in the same TU (same source file or in a header) or only if the definition is in another TU (source file).
3. Is it still slow the 2nd time go to def is invoked?

We can also see if we are able to notice a slow go to definition (so far we have not). It could potentially be an issue with either the IntelliSense process cpptools-srv or with querying the database if the definition is in another TU.

[tshcherban-wb]

1. yes
2. in both cases
3. yes