[clang][Index] Enable indexing of Template Type Parameters behind a flag

Summary:
clangd uses indexing api to provide references and it was not possible
to perform symbol information for template parameters. This patch enables
visiting of TemplateTypeParmTypeLocs.

Reviewers: ilya-biryukov, akyrtzi

Subscribers: javed.absar, kristof.beyls, ioeric, arphaman, cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D58293

llvm-svn: 354560

1 files changed, 8 insertions, 1 deletions

diff --git a/clang/lib/Index/IndexingContext.cpp b/clang/lib/Index/IndexingContext.cpp
index 3d2d7d4ff02..d01dd50f3b5 100644
--- a/clang/lib/Index/IndexingContext.cpp
+++ b/clang/lib/Index/IndexingContext.cpp
@@ -44,6 +44,10 @@ bool IndexingContext::shouldIndexParametersInDeclarations() const {
   return IndexOpts.IndexParametersInDeclarations;
 }
 
+bool IndexingContext::shouldIndexTemplateParameters() const {
+  return IndexOpts.IndexTemplateParameters;
+}
+
 bool IndexingContext::handleDecl(const Decl *D,
                                  SymbolRoleSet Roles,
                                  ArrayRef<SymbolRelation> Relations) {
@@ -76,8 +80,11 @@ bool IndexingContext::handleReference(const NamedDecl *D, SourceLocation Loc,
   if (!shouldIndexFunctionLocalSymbols() && isFunctionLocalSymbol(D))
     return true;
 
-  if (isa<NonTypeTemplateParmDecl>(D) || isa<TemplateTypeParmDecl>(D))
+  if (!shouldIndexTemplateParameters() &&
+      (isa<NonTypeTemplateParmDecl>(D) || isa<TemplateTypeParmDecl>(D) ||
+       isa<TemplateTemplateParmDecl>(D))) {
     return true;
+  }
 
   return handleDeclOccurrence(D, Loc, /*IsRef=*/true, Parent, Roles, Relations,
                               RefE, RefD, DC);