[all-commits] [llvm/llvm-project] b2528f: [clang][deps] Stop using `ClangTool` for virtual f...

[Diana via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: b2528fc49035588b69cec2b4bfba87a0d3eb725d
      https://github.com/llvm/llvm-project/commit/b2528fc49035588b69cec2b4bfba87a0d3eb725d
  Author: Diana Picus <diana.picus at linaro.org>
  Date:   2021-09-10 (Fri, 10 Sep 2021)

  Changed paths:
    M clang/include/clang/Tooling/DependencyScanning/DependencyScanningWorker.h
    M clang/lib/Tooling/DependencyScanning/DependencyScanningWorker.cpp

  Log Message:
  -----------
  [clang][deps] Stop using `ClangTool` for virtual files

This patch changes how the dependency scanner creates the fake input file when scanning dependencies of a single module (introduced in D109485). The scanner now has its own `InMemoryFilesystem` which sits under the minimizing FS (when that's requested). This makes it possible to drop the duplicate work in `DependencyScanningActions::runInvocation` that sets up the main file ID. Besides that, this patch makes it possible to land D108979, where we drop `ClangTool` entirely.

Depends on D109485.

Reviewed By: dexonsmith

Differential Revision: https://reviews.llvm.org/D109498