[all-commits] [llvm/llvm-project] 808c28: [clangd] Add tests that no-op changes are cheap

[Sam McCall via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 808c2855e11615a384df9667338aa52854a92fd5
      https://github.com/llvm/llvm-project/commit/808c2855e11615a384df9667338aa52854a92fd5
  Author: Sam McCall <sam.mccall at gmail.com>
  Date:   2020-04-14 (Tue, 14 Apr 2020)

  Changed paths:
    M clang-tools-extra/clangd/ClangdServer.cpp
    M clang-tools-extra/clangd/ClangdServer.h
    M clang-tools-extra/clangd/TUScheduler.cpp
    M clang-tools-extra/clangd/TUScheduler.h
    M clang-tools-extra/clangd/unittests/ClangdTests.cpp
    M clang-tools-extra/clangd/unittests/TUSchedulerTests.cpp

  Log Message:
  -----------
  [clangd] Add tests that no-op changes are cheap

Summary:
We want to be sure they don't cause AST rebuilds or evict items from the cache.
D77847 is going to start sending spurious no-op changes (in case the preamble
was invalidated), this is cheap enough but we shouldn't regress that in future.

Reviewers: kadircet

Subscribers: ilya-biryukov, javed.absar, MaskRay, jkorous, arphaman, jfb, usaxena95, cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D78048