[clangd] Implement findOccurrences interface in dynamic index.

Summary:
Implement the interface in
  - FileIndex
  - MemIndex
  - MergeIndex

Depends on https://reviews.llvm.org/D50385.

Reviewers: sammccall, ilya-biryukov

Reviewed By: sammccall

Subscribers: mgrang, ilya-biryukov, ioeric, MaskRay, jkorous, arphaman, kadircet, cfe-commits

Differential Revision: https://reviews.llvm.org/D51279

llvm-svn: 341242

1 files changed, 12 insertions, 5 deletions

diff --git a/clang-tools-extra/clangd/index/FileIndex.h b/clang-tools-extra/clangd/index/FileIndex.h
index 58fad2f62e2..0794472885c 100644
--- a/clang-tools-extra/clangd/index/FileIndex.h
+++ b/clang-tools-extra/clangd/index/FileIndex.h
@@ -39,18 +39,25 @@ namespace clangd {
 /// locking when we swap or obtain refereces to snapshots.
 class FileSymbols {
 public:
-  /// \brief Updates all symbols in a file. If \p Slab is nullptr, symbols for
-  /// \p Path will be removed.
-  void update(PathRef Path, std::unique_ptr<SymbolSlab> Slab);
+  /// \brief Updates all symbols and occurrences in a file.
+  /// If \p Slab (Occurrence) is nullptr, symbols (occurrences) for \p Path
+  /// will be removed.
+  void update(PathRef Path, std::unique_ptr<SymbolSlab> Slab,
+              std::unique_ptr<SymbolOccurrenceSlab> Occurrences);
 
   // The shared_ptr keeps the symbols alive
   std::shared_ptr<std::vector<const Symbol *>> allSymbols();
 
+  /// Returns all symbol occurrences for all active files.
+  std::shared_ptr<MemIndex::OccurrenceMap> allOccurrences() const;
+
 private:
   mutable std::mutex Mutex;
 
   /// \brief Stores the latest snapshots for all active files.
   llvm::StringMap<std::shared_ptr<SymbolSlab>> FileToSlabs;
+  /// Stores the latest occurrence slabs for all active files.
+  llvm::StringMap<std::shared_ptr<SymbolOccurrenceSlab>> FileToOccurrenceSlabs;
 };
 
 /// \brief This manages symbls from files and an in-memory index on all symbols.
@@ -90,12 +97,12 @@ private:
   std::vector<std::string> URISchemes;
 };
 
-/// Retrieves namespace and class level symbols in \p AST.
+/// Retrieves symbols and symbol occurrences in \p AST.
 /// Exposed to assist in unit tests.
 /// If URISchemes is empty, the default schemes in SymbolCollector will be used.
 /// If \p TopLevelDecls is set, only these decls are indexed. Otherwise, all top
 /// level decls obtained from \p AST are indexed.
-SymbolSlab
+std::pair<SymbolSlab, SymbolOccurrenceSlab>
 indexAST(ASTContext &AST, std::shared_ptr<Preprocessor> PP,
          llvm::Optional<llvm::ArrayRef<Decl *>> TopLevelDecls = llvm::None,
          llvm::ArrayRef<std::string> URISchemes = {});