Implement libclang support for using declarations. Clang actually uses

three different kinds of AST nodes to represent using declarations:
UsingDecl, UnresolvedUsingValueDecl, and
UnresolvedUsingTypenameDecl. These three are collapsed into a single
cursor kind for using declarations, since libclang clients don't need
the distinction.

Several related changes here:
  - Cursor visitation of the three AST nodes for using declarations
  - Proper source-range computation for these AST nodes
  - Using declarations have no USRs, since they don't actually declare
    any entities.

llvm-svn: 112730

1 files changed, 9 insertions, 0 deletions

diff --git a/clang/tools/libclang/CIndexUSRs.cpp b/clang/tools/libclang/CIndexUSRs.cpp
index a60d1d3e189..8f3dacfad21 100644
--- a/clang/tools/libclang/CIndexUSRs.cpp
+++ b/clang/tools/libclang/CIndexUSRs.cpp
@@ -86,6 +86,15 @@ public:
   void VisitUsingDirectiveDecl(UsingDirectiveDecl *D) {
     IgnoreResults = true;
   }
+  void VisitUsingDecl(UsingDecl *D) { 
+    IgnoreResults = true;
+  }
+  void VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl *D) { 
+    IgnoreResults = true;
+  }
+  void VisitUnresolvedUsingTypenameDecl(UnresolvedUsingTypenameDecl *D) { 
+    IgnoreResults = true;
+  }
   
   /// Generate the string component containing the location of the
   ///  declaration.