[clangd] Add xrefs LSP boilerplate implementation.

Reviewers: ilya-biryukov, ioeric

Subscribers: MaskRay, jkorous, arphaman, cfe-commits

Differential Revision: https://reviews.llvm.org/D50896

llvm-svn: 341462

1 files changed, 12 insertions, 0 deletions

diff --git a/clang-tools-extra/clangd/ClangdServer.cpp b/clang-tools-extra/clangd/ClangdServer.cpp
index 5bd2a910dff..0a8e748b2f8 100644
--- a/clang-tools-extra/clangd/ClangdServer.cpp
+++ b/clang-tools-extra/clangd/ClangdServer.cpp
@@ -560,6 +560,18 @@ void ClangdServer::documentSymbols(
                            Bind(Action, std::move(CB)));
 }
 
+void ClangdServer::findReferences(PathRef File, Position Pos,
+                                  Callback<std::vector<Location>> CB) {
+  auto Action = [Pos, this](Callback<std::vector<Location>> CB,
+                            llvm::Expected<InputsAndAST> InpAST) {
+    if (!InpAST)
+      return CB(InpAST.takeError());
+    CB(clangd::findReferences(InpAST->AST, Pos, Index));
+  };
+
+  WorkScheduler.runWithAST("References", File, Bind(Action, std::move(CB)));
+}
+
 std::vector<std::pair<Path, std::size_t>>
 ClangdServer::getUsedBytesPerFile() const {
   return WorkScheduler.getUsedBytesPerFile();