[clangd] Avoid collecting symbols from broken TUs in global-symbol-builder.

Summary:
For example, template parameter might not be resolved in a broken TU,
which can result in wrong USR/SymbolID.

Reviewers: ilya-biryukov

Subscribers: MaskRay, jkorous, cfe-commits

Differential Revision: https://reviews.llvm.org/D48881

llvm-svn: 336252

1 files changed, 8 insertions, 0 deletions

diff --git a/clang-tools-extra/clangd/global-symbol-builder/GlobalSymbolBuilderMain.cpp b/clang-tools-extra/clangd/global-symbol-builder/GlobalSymbolBuilderMain.cpp
index 1ea73b55946..1cfda579d7f 100644
--- a/clang-tools-extra/clangd/global-symbol-builder/GlobalSymbolBuilderMain.cpp
+++ b/clang-tools-extra/clangd/global-symbol-builder/GlobalSymbolBuilderMain.cpp
@@ -82,6 +82,14 @@ public:
       void EndSourceFileAction() override {
         WrapperFrontendAction::EndSourceFileAction();
 
+        const auto &CI = getCompilerInstance();
+        if (CI.hasDiagnostics() &&
+            (CI.getDiagnosticClient().getNumErrors() > 0)) {
+          llvm::errs() << "Found errors in the translation unit. Igoring "
+                          "collected symbols...\n";
+          return;
+        }
+
         auto Symbols = Collector->takeSymbols();
         for (const auto &Sym : Symbols) {
           Ctx->reportResult(Sym.ID.str(), SymbolToYAML(Sym));