[clangd] Implementation of textDocument/documentSymbol

Summary:
An AST-based approach is used to retrieve the document symbols rather than an
in-memory index query. The index is not an ideal fit to achieve this because of
the file-centric query being done here whereas the index is suited for
project-wide queries. Document symbols also includes more symbols and need to
keep the order as seen in the file.

Signed-off-by: Marc-Andre Laperle <marc-andre.laperle@ericsson.com>

Subscribers: tomgr, ilya-biryukov, ioeric, MaskRay, jkorous, cfe-commits

Differential Revision: https://reviews.llvm.org/D47846

llvm-svn: 336386

1 files changed, 3 insertions, 0 deletions

diff --git a/clang-tools-extra/clangd/SourceCode.h b/clang-tools-extra/clangd/SourceCode.h
index a61d411fe13..b67fe6ecfde 100644
--- a/clang-tools-extra/clangd/SourceCode.h
+++ b/clang-tools-extra/clangd/SourceCode.h
@@ -61,6 +61,9 @@ TextEdit replacementToEdit(StringRef Code, const tooling::Replacement &R);
 std::vector<TextEdit> replacementsToEdits(StringRef Code,
                                           const tooling::Replacements &Repls);
 
+/// Get the absolute file path of a given file entry.
+llvm::Optional<std::string> getAbsoluteFilePath(const FileEntry *F,
+                                                const SourceManager &SourceMgr);
 } // namespace clangd
 } // namespace clang
 #endif