[PATCH] D121165: [pseudo] Add crude heuristics to choose taken preprocessor branches.

[Sam McCall via Phabricator via cfe-commits]

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In files where different preprocessing paths are possible, our goal is to
choose a preprocessed token sequence which we can parse that pins down as much
of the grammatical structure as possible.
This forms the "primary parse", and the not-taken branches get parsed later,
and are constrained to be compatible with the primary parse.

Concretely:

  int x =
    #ifdef // TAKEN
      2 + 2 + 2 // determined during primary parse to be an expression
    #else
      2 // constrained to be an expression during a secondary parse
    #endif
    ;


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D121165

Files:
  clang/include/clang/Tooling/Syntax/Pseudo/DirectiveMap.h
  clang/include/clang/Tooling/Syntax/Pseudo/Token.h
  clang/lib/Tooling/Syntax/Pseudo/DirectiveMap.cpp
  clang/test/Syntax/lex.c
  clang/tools/clang-pseudo/ClangPseudo.cpp
  clang/unittests/Tooling/Syntax/Pseudo/DirectiveMapTest.cpp

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