Add clang_getCursorLinkage(), which returns the

underlying linkage for the entity referred to by a
CXCursor.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@97646 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 45 insertions, 0 deletions

diff --git a/include/clang-c/Index.h b/include/clang-c/Index.h
index c1238e5d88..7bc290d88f 100644
--- a/include/clang-c/Index.h
+++ b/include/clang-c/Index.h
@@ -889,6 +889,32 @@ CINDEX_LINKAGE unsigned clang_isInvalid(enum CXCursorKind);
 CINDEX_LINKAGE unsigned clang_isTranslationUnit(enum CXCursorKind);
 
 /**
+ * \brief Describe the linkage of the entity referred to by a cursor.
+ */
+enum CXLinkageKind {
+  /** \brief This value indicates that no linkage information is available
+   * for a provided CXCursor. */
+  CXLinkage_Invalid,
+  /**
+   * \brief This is the linkage for variables, parameters, and so on that
+   *  have automatic storage.  This covers normal (non-extern) local variables.
+   */
+  CXLinkage_NoLinkage,
+  /** \brief This is the linkage for static variables and static functions. */
+  CXLinkage_Internal,
+  /** \brief This is the linkage for entities with external linkage that live
+   * in C++ anonymous namespaces.*/
+  CXLinkage_UniqueExternal,
+  /** \brief This is the linkage for entities with true, external linkage. */
+  CXLinkage_External
+};
+
+/**
+ * \brief Determine the linkage of the entity referred to be a given cursor.
+ */
+CINDEX_LINKAGE enum CXLinkageKind clang_getCursorLinkage(CXCursor cursor);
+
+/**
  * @}
  */
 
diff --git a/tools/CIndex/CIndex.cpp b/tools/CIndex/CIndex.cpp
index e13dddfcad..6fc7b53030 100644
--- a/tools/CIndex/CIndex.cpp
+++ b/tools/CIndex/CIndex.cpp
@@ -2210,6 +2210,25 @@ void clang_disposeTokens(CXTranslationUnit TU,
 } // end: extern "C"
 
 //===----------------------------------------------------------------------===//
+// Operations for querying linkage of a cursor.
+//===----------------------------------------------------------------------===//
+
+extern "C" {
+CXLinkageKind clang_getCursorLinkage(CXCursor cursor) {
+  Decl *D = cxcursor::getCursorDecl(cursor);
+  if (NamedDecl *ND = dyn_cast_or_null<NamedDecl>(D))
+    switch (ND->getLinkage()) {
+      case NoLinkage: return CXLinkage_NoLinkage;
+      case InternalLinkage: return CXLinkage_Internal;
+      case UniqueExternalLinkage: return CXLinkage_UniqueExternal;
+      case ExternalLinkage: return CXLinkage_External;
+    };
+
+  return CXLinkage_Invalid;
+}
+} // end: extern "C"
+
+//===----------------------------------------------------------------------===//
 // CXString Operations.
 //===----------------------------------------------------------------------===//