From aa803409c3bd3930126db630c29f63d42f255153 Mon Sep 17 00:00:00 2001
From: Dimitry Andric <dim@FreeBSD.org>
Date: Mon, 22 May 2017 19:43:45 +0000
Subject: Vendor import of clang trunk r303571:
 https://llvm.org/svn/llvm-project/cfe/trunk@303571

---
 lib/AST/DeclBase.cpp | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

(limited to 'lib/AST/DeclBase.cpp')

diff --git a/lib/AST/DeclBase.cpp b/lib/AST/DeclBase.cpp
index f6f81692611d..81cd1cc42658 100644
--- a/lib/AST/DeclBase.cpp
+++ b/lib/AST/DeclBase.cpp
@@ -407,6 +407,27 @@ bool Decl::isExported() const {
   return false;
 }
 
+ExternalSourceSymbolAttr *Decl::getExternalSourceSymbolAttr() const {
+  const Decl *Definition = nullptr;
+  if (auto ID = dyn_cast<ObjCInterfaceDecl>(this)) {
+    Definition = ID->getDefinition();
+  } else if (auto PD = dyn_cast<ObjCProtocolDecl>(this)) {
+    Definition = PD->getDefinition();
+  } else if (auto TD = dyn_cast<TagDecl>(this)) {
+    Definition = TD->getDefinition();
+  }
+  if (!Definition)
+    Definition = this;
+
+  if (auto *attr = Definition->getAttr<ExternalSourceSymbolAttr>())
+    return attr;
+  if (auto *dcd = dyn_cast<Decl>(getDeclContext())) {
+    return dcd->getAttr<ExternalSourceSymbolAttr>();
+  }
+
+  return nullptr;
+}
+
 bool Decl::hasDefiningAttr() const {
   return hasAttr<AliasAttr>() || hasAttr<IFuncAttr>();
 }
-- 
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