mirror of
https://github.com/MaskRay/ccls.git
synced 2024-11-21 23:25:07 +00:00
46 lines
3.1 KiB
Markdown
46 lines
3.1 KiB
Markdown
# ccls
|
|
|
|
[](https://telegram.me/cclsp)
|
|
[](https://gitter.im/ccls-project/ccls)
|
|
|
|
ccls, which originates from [cquery](https://github.com/cquery-project/cquery), is a C/C++/Objective-C language server.
|
|
|
|
* code completion (with both signature help and snippets)
|
|
* [definition](src/messages/textDocument_definition.cc)/[references](src/messages/textDcument_references.cc), and other cross references
|
|
* hierarchies: [call (caller/callee) hierarchy](src/messages/ccls_callHierarchy.cc), [inheritance (base/derived) hierarchy](src/messages/ccls_inheritanceHierarchy.cc), [member hierarchy](src/messages/ccls_memberHierarchy.cc)
|
|
* [symbol rename](src/messages/text_documentRename.cc)
|
|
* [document symbols](src/messages/textDocument_documentSymbol.cc) and approximate search of [workspace symbol](src/messages/workspace_symbol.cc)
|
|
* [hover information](src/messages/textDocument_hover.cc)
|
|
* diagnostics and code actions (clang FixIts)
|
|
* semantic highlighting and preprocessor skipped regions
|
|
|
|
It has a global view of the code base and support a lot of cross reference features, see [wiki/FAQ](../../wiki/FAQ).
|
|
It starts indexing the whole project (including subprojects if exist) parallelly when you open the first file, while the main thread can serve requests before the indexing is complete.
|
|
Saving files will incrementally update the index.
|
|
|
|
Compared with cquery, it makes use of C++17 features, has less third-party dependencies and slimmed-down code base.
|
|
It leverages Clang C++ API as [clangd](https://clang.llvm.org/extra/clangd.html) does, which provides better support for code completion and diagnostics.
|
|
Refactoring and formatting are non-goals as they can be provided by clang-format, clang-include-fixer and other Clang based tools.
|
|
|
|
The comparison with cquery as noted on 2018-07-15:
|
|
|
|
| | cquery | ccls |
|
|
|------------ |--------------------------------|------------------------------|
|
|
| third_party | more | fewer |
|
|
| C++ | C++14 | C++17 |
|
|
| clang API | libclang (C) | clang/llvm C++ |
|
|
| Filesystem | AbsolutePath + custom routines | llvm/Support |
|
|
| index | libclang | clangIndex, some enhancement |
|
|
| pipeline | index merge+id remapping | simpler and more robust |
|
|
|
|
cquery has system include path detection (through running the compiler driver) while ccls uses clangDriver.
|
|
|
|
# >>> [Getting started](../../wiki/Getting-started) (CLICK HERE) <<<
|
|
|
|
* [Build](../../wiki/Build)
|
|
* [Emacs](../../wiki/Emacs)
|
|
* [LanguageClient-neovim](../../wiki/LanguageClient-neovim)
|
|
* [FAQ](../../wiki/FAQ)
|
|
|
|
ccls can index itself (~180MiB RSS when ide, noted on 2018-09-01), FreeBSD, glibc, Linux, LLVM (~1800MiB RSS), musl (~60MiB RSS), ... with decent memory footprint. See [wiki/compile_commands.json](../../wiki/compile_commands.json) for examples.
|