[all-commits] [llvm/llvm-project] c4436f: [clang] Use InMemoryModuleCache for readASTFileCon...

[Ben Langmuir via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: c4436f675d8f5903303fc13d2c2eff2c5800d49b
      https://github.com/llvm/llvm-project/commit/c4436f675d8f5903303fc13d2c2eff2c5800d49b
  Author: Ben Langmuir <blangmuir at apple.com>
  Date:   2022-11-17 (Thu, 17 Nov 2022)

  Changed paths:
    M clang/include/clang/Serialization/ASTReader.h
    M clang/lib/Frontend/CompilerInstance.cpp
    M clang/lib/Frontend/FrontendAction.cpp
    M clang/lib/Frontend/FrontendActions.cpp
    M clang/lib/Serialization/ASTReader.cpp
    M clang/lib/Tooling/DependencyScanning/DependencyScanningWorker.cpp

  Log Message:
  -----------
  [clang] Use InMemoryModuleCache for readASTFileControlBlock NFC

When a pcm has already been loaded from disk, reuse it from the
InMemoryModuleCache in readASTFileControlBlock. This avoids potentially
reading it again.

As noted in the FIXME, ideally we would also add the module to the cache
if it will be used again later, but that could modify its build state
and we do not have enough context currenlty to know if it's correct.

Differential Revision: https://reviews.llvm.org/D138160