[index] Take advantage of 'external_source_symbol' attribute for indexing purposes

- Ignore decls marked as 'generated_declaration'
- Include the 'defined_in' in the USR for additional namespacing

llvm-svn: 300949

1 files changed, 11 insertions, 0 deletions

diff --git a/clang/lib/Index/IndexingContext.cpp b/clang/lib/Index/IndexingContext.cpp
index 85574d0a314..254abecd4e4 100644
--- a/clang/lib/Index/IndexingContext.cpp
+++ b/clang/lib/Index/IndexingContext.cpp
@@ -17,6 +17,17 @@
 using namespace clang;
 using namespace index;
 
+static bool isGeneratedDecl(const Decl *D) {
+  if (auto *attr = D->getAttr<ExternalSourceSymbolAttr>()) {
+    return attr->getGeneratedDeclaration();
+  }
+  return false;
+}
+
+bool IndexingContext::shouldIndex(const Decl *D) {
+  return !isGeneratedDecl(D);
+}
+
 bool IndexingContext::shouldIndexFunctionLocalSymbols() const {
   return IndexOpts.IndexFunctionLocals;
 }