[PATCH] D103142: [clang][clangd] Use reverse header map lookup in suggestPathToFileForDiagnostics

[Dmitry Polukhin via Phabricator via cfe-commits]

DmitryPolukhin created this revision.
DmitryPolukhin added reviewers: dexonsmith, bruno, rsmith.
DmitryPolukhin added a project: clang.
Herald added subscribers: usaxena95, ormris, kadircet, arphaman.
DmitryPolukhin requested review of this revision.
Herald added subscribers: MaskRay, ilya-biryukov.

suggestPathToFileForDiagnostics is actively used in clangd for converting
an absolute path to a header file to a header name as it should be spelled
in the sources. Current approach converts absolute path to relative path.
This diff implements missing logic that makes a reverse lookup from the
relative path to the key in the header map that should be used in the sources.

Test Plan: check-clang


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D103142

Files:
  clang/include/clang/Lex/HeaderMap.h
  clang/lib/Lex/HeaderMap.cpp
  clang/lib/Lex/HeaderSearch.cpp
  clang/unittests/Lex/HeaderMapTest.cpp
  clang/unittests/Lex/HeaderMapTestUtils.h
  clang/unittests/Lex/HeaderSearchTest.cpp

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