[Index] Index paremeters in lambda expressions.

Summary: This fixes clangd couldn't find references for lambda parameters.

Reviewers: ilya-biryukov

Subscribers: ioeric, arphaman, kadircet, cfe-commits

Differential Revision: https://reviews.llvm.org/D55437

llvm-svn: 349626

1 files changed, 11 insertions, 0 deletions

diff --git a/clang/lib/Index/IndexBody.cpp b/clang/lib/Index/IndexBody.cpp
index dd8a1c7b3f7..54a6df2496a 100644
--- a/clang/lib/Index/IndexBody.cpp
+++ b/clang/lib/Index/IndexBody.cpp
@@ -9,6 +9,7 @@
 
 #include "IndexingContext.h"
 #include "clang/AST/RecursiveASTVisitor.h"
+#include "clang/AST/ASTLambda.h"
 
 using namespace clang;
 using namespace clang::index;
@@ -454,6 +455,16 @@ public:
     }
     return true;
   }
+
+  bool VisitParmVarDecl(ParmVarDecl* D) {
+    // Index the parameters of lambda expression.
+    if (IndexCtx.shouldIndexFunctionLocalSymbols()) {
+      const auto *DC = D->getDeclContext();
+      if (DC && isLambdaCallOperator(DC))
+        IndexCtx.handleDecl(D);
+    }
+    return true;
+  }
 };
 
 } // anonymous namespace