[PATCH] D63907: [clang-scan-deps] Implementation of dependency scanner over minimized sources

[Alex Lorenz via Phabricator via cfe-commits]

arphaman created this revision.
arphaman added reviewers: Bigcheese, aganea.
Herald added subscribers: tschuett, dexonsmith, jkorous, mgorny.
Herald added a project: clang.

This patch implements the fast dependency scanning mode in `clang-scan-deps`: the preprocessing is done on files that are minimized using the dependency directives source minimizer.

A shared file system cache is used to ensure that the file system requests and source minimization is performed only once. The cache assumes that the underlying filesystem won't change during the course of the scan (or if it will, it will not affect the output), and it can't be evicted. This means that the service and workers can be used for a single run of a dependency scanner, and can't be reused across multiple, incremental runs. This is something that we'll most likely support in the future though. Note that the driver still utilizes the underlying real filesystem.

This patch is also still missing the fast skipped PP block skipping optimization that I mentioned at EuroLLVM talk.


Repository:
  rC Clang

https://reviews.llvm.org/D63907

Files:
  clang/include/clang/Basic/FileManager.h
  clang/include/clang/Tooling/DependencyScanning/DependencyScanningFilesystem.h
  clang/include/clang/Tooling/DependencyScanning/DependencyScanningService.h
  clang/include/clang/Tooling/DependencyScanning/DependencyScanningWorker.h
  clang/lib/Tooling/DependencyScanning/CMakeLists.txt
  clang/lib/Tooling/DependencyScanning/DependencyScanningFilesystem.cpp
  clang/lib/Tooling/DependencyScanning/DependencyScanningService.cpp
  clang/lib/Tooling/DependencyScanning/DependencyScanningWorker.cpp
  clang/test/ClangScanDeps/Inputs/frameworks/Framework.framework/Headers/Framework.h
  clang/test/ClangScanDeps/Inputs/frameworks/Framework.framework/PrivateHeaders/PrivateHeader.h
  clang/test/ClangScanDeps/Inputs/header_stat_before_open_cdb.json
  clang/test/ClangScanDeps/Inputs/vfsoverlay.yaml
  clang/test/ClangScanDeps/Inputs/vfsoverlay_cdb.json
  clang/test/ClangScanDeps/header_stat_before_open.m
  clang/test/ClangScanDeps/regular_cdb.cpp
  clang/test/ClangScanDeps/vfsoverlay.cpp
  clang/tools/clang-scan-deps/ClangScanDeps.cpp

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