[PATCH] D93148: Basic: Add native support for stdin to SourceManager and FileManager

[Duncan P. N. Exon Smith via Phabricator via cfe-commits]

dexonsmith created this revision.
dexonsmith added reviewers: arphaman, JDevlieghere, jansvoboda11.
Herald added a subscriber: ributzka.
dexonsmith requested review of this revision.
Herald added a project: clang.

Add support for stdin to SourceManager and FileManager. Adds
FileManager::getSTDIN, which adds a FileEntryRef for `<stdin>` and reads
the MemoryBuffer, which is stored as `FileEntry::Content`.

Eventually the other buffers in `ContentCache` will sink to here as well

- we probably usually want to load/save a MemoryBuffer eagerly -- but

it's happening early for stdin to get rid of
CompilerInstance::InitializeSourceManager's final call to
`SourceManager::overrideFileContents`.

clang/test/CXX/modules-ts/dcl.dcl/dcl.module/dcl.module.export/p1.cpp
relies on building a module from stdin; supporting that requires setting
ContentCache::BufferOverridden.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D93148

Files:
  clang/include/clang/Basic/FileEntry.h
  clang/include/clang/Basic/FileManager.h
  clang/lib/Basic/FileEntry.cpp
  clang/lib/Basic/FileManager.cpp
  clang/lib/Basic/SourceManager.cpp
  clang/lib/Frontend/CompilerInstance.cpp

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