[PATCH] D61643: [PragmaHandler][NFC] Expose `#pragma` location

[Joel E. Denny via Phabricator via cfe-commits]

jdenny created this revision.
jdenny added reviewers: ABataev, lebedev.ri.
Herald added a subscriber: jdoerfert.
Herald added a project: clang.

Currently, a pragma AST node's recorded location starts at the 
namespace token (such as `omp` in the case of OpenMP) after the 
`#pragma` token, and the `#pragma` location isn't available.  However,
the `#pragma` location can be useful when, for example, rewriting a
directive using Clang's Rewrite facility.

This patch makes `#pragma` locations available in any `PragmaHandler`
but it doesn't yet make use of them.

This patch also uses the new `struct PragmaIntroducer` to simplify
`Preprocessor::HandlePragmaDirective`.  It doesn't do the same for 
`PPCallbacks::PragmaDirective` because that changes the API documented
in `clang-tools-extra/docs/pp-trace.rst`, and I'm not sure about
backward compatibility guarantees there.

This patch was forked from D61509 <https://reviews.llvm.org/D61509>.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D61643

Files:
  clang/docs/ClangPlugins.rst
  clang/examples/AnnotateFunctions/AnnotateFunctions.cpp
  clang/include/clang/Lex/Pragma.h
  clang/include/clang/Lex/Preprocessor.h
  clang/lib/Frontend/PrintPreprocessedOutput.cpp
  clang/lib/Lex/PPDirectives.cpp
  clang/lib/Lex/Pragma.cpp
  clang/lib/Parse/ParsePragma.cpp

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