1 files changed, 33 insertions, 1 deletions
diff --git a/llvm/lib/Target/PIC16/PIC16PAN.h b/llvm/lib/Target/PIC16/PIC16PAN.h
index cca8f355a71..f0e1ba0de07 100644
--- a/llvm/lib/Target/PIC16/PIC16PAN.h
+++ b/llvm/lib/Target/PIC16/PIC16PAN.h
@@ -22,8 +22,19 @@
 #include <cassert>
 #include <cstring>
 #include <string>
-
 namespace llvm {
+namespace PIC16Overlay {
+  // Implement Overlay through colors because we may want to enhance overlay
+  // architecture later. More colors can be added then. 
+  // Idea here is that functions with same color can be overlayed.
+  enum Overlay {
+    // A color name can only consist of upper case letters and underscore.
+    GREEN, // Stands for mainline functions that can be overlayed.
+    GREEN_IL, // Interrupt line version of GREEN.
+    RED // Stands for functions that can not be overlayed.
+  };
+}
+
   // A Central class to manage all ABI naming conventions.
   // PAN - [P]ic16 [A]BI [N]ames
   class PAN {
@@ -414,6 +425,27 @@ namespace llvm {
         }
       }
     }
+    inline static std::string getOverlayStr(unsigned Color) {
+      std::string Str = "Overlay=";
+      Str.append(getSectionNameForColor(Color));
+      return Str;
+    }
+
+    inline static std::string getSectionNameForColor(unsigned Color) {
+      switch (Color) {
+        case PIC16Overlay::GREEN:
+          return "GREEN";
+        case PIC16Overlay::GREEN_IL:
+          return "GREEN_IL";
+        default:
+          assert( 0 && "Color not supported");
+      }   
+    }
+
+    inline static std::string getAutosSectionForColor(std::string Color) {
+      return Color.append("_AUTOS");
+    }
+
   }; // class PAN.
 
 } // end namespace llvm;