[PATCH] D154621: [ClangRepl] support code completion at the repl

[Fred Fu via Phabricator via cfe-commits]

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This patch enabled code completion for ClangREPL. The feature was built upon two
existing Clang components: a list completer for `LineEditor` and `SemaCodeCompletion`.

The former serves the main entry point to trigger the latter. Because a
completion point for a compiler instance needs to be unchanged once it is set,
an incremental compiler instance for code completion is created. In addition to
completion points, it differs from a regular incremental compiler in the following ways:

1. It does not execute input.

2. To obtain declarations or bindings from previous input in the same REPL

session, it carries over AST context source from the main compiler, i.e. the one
used for the interpreter.

3. It contains a `ReplCompletionConsumer`, a subclass of

`CodeCompletionConsumer`. The consumer communicates completion results from
`SemaCodeCompletion` back to the list completer for the REPL.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D154621

Files:
  clang/include/clang/Interpreter/CodeCompletion.h
  clang/include/clang/Interpreter/Interpreter.h
  clang/lib/Interpreter/CMakeLists.txt
  clang/lib/Interpreter/CodeCompletion.cpp
  clang/lib/Interpreter/ExternalSource.cpp
  clang/lib/Interpreter/ExternalSource.h
  clang/lib/Interpreter/IncrementalParser.cpp
  clang/lib/Interpreter/IncrementalParser.h
  clang/lib/Interpreter/Interpreter.cpp
  clang/tools/clang-repl/ClangRepl.cpp
  clang/unittests/Interpreter/CMakeLists.txt
  clang/unittests/Interpreter/CodeCompletionTest.cpp

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