ccls

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Observed behavior

Recently, I used doom-emacs and ccls to develop llvm-project. But when I open large files like(lld/ELF/Driver.cpp), the speed of moving the cursor became very slow.

Expected behavior

I dream that moving the cursor become more fluently in large files

Steps to reproduce

this is my ccls config:

(use-package! ccls
  :when (featurep! +lsp)
  :unless (featurep! :tools lsp +eglot)
  :hook (lsp-lens-mode . ccls-code-lens-mode)
  :init
  (after! projectile
    (add-to-list 'projectile-globally-ignored-directories ".ccls-cache")
    (add-to-list 'projectile-project-root-files-bottom-up ".ccls-root"))
  ;;  (add-to-list 'projectile-project-root-files-top-down-recurring "compile_commands.json")
  ;; Avoid using `:after' because it ties the :config below to when `lsp-mode'
  ;; loads, rather than `ccls' loads.
  (after! lsp-mode (require 'ccls))
  :config
  (set-evil-initial-state! 'ccls-tree-mode 'emacs)
  ;; Disable `ccls-sem-highlight-method' if `lsp-enable-semantic-highlighting'
  ;; is nil. Otherwise, it appears ccls bypasses it.
  ;;(setq-hook! 'lsp-configure-hook
  ;;  ccls-sem-highlight-method (if lsp-enable-semantic-highlighting
  ;;                                ccls-sem-highlight-method))
  (setq ccls-sem-highlight-method 'font-lock)
  ;; alternatively, (setq ccls-sem-highlight-method 'overlay)

  ;; For rainbow semantic highlighting
  (ccls-use-default-rainbow-sem-highlight)
  (when (or IS-MAC IS-LINUX)
    (setq ccls-initialization-options
          `(:index (:trackDependency 1
                    :threads ,(max 1 (/ (doom-system-cpus) 2))))))
  (when IS-MAC
    (setq ccls-initialization-options
          (append ccls-initialization-options
                  `(:clang ,(list :extraArgs ["-isystem/Library/Developer/CommandLineTools/usr/include/c++/v1"
                                              "-isystem/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include"
                                              "-isystem/usr/local/include"]
                                  :resourceDir (cdr (doom-call-process "clang" "-print-resource-dir"))))))))

System information

• ccls version (git describe --tags --long): I built ccls from source, in master branch. last commit happened on Sep 23, 2021
• clang version: clang version 12.0.0 (https://github.com/llvm/llvm-project/ b978a93635b584db380274d7c8963c73989944a1)
• OS: ubuntu 20.04
• Editor: doom emacs
• Language client (and version): emacs-lsp

I think this is an Emacs problem. I find that lsp-ui-doc is quite slow and (setq lsp-ui-doc-enable nil) helps...

Same problem here, please try this file https://github.com/redis/redis/blob/unstable/src/module.c , it's very very slow 👀 @MaskRay

我也碰到相同问题，查明是font-lock导致的卡顿。clangd没有出现这个问题，可能是它的语法高亮功能没有ccls做的好，对字体渲染少。 M-x global-font-lock-mode 关闭font-lock mode可以流畅浏览大文件，但是同时丢失了语法高亮功能。 希望有个两全其美的方法。@MaskRay

I think this has to do with lsp-mode. See: https://github.com/emacs-lsp/lsp-mode/issues/3219

I turned lens off and it worked.