Support for show/hide combinators

runtime/vm/raw_object.h

Index: runtime/vm/raw_object.h
===================================================================
--- runtime/vm/raw_object.h	(revision 12785)
+++ runtime/vm/raw_object.h	(working copy)
@@ -31,6 +31,7 @@
   V(Script)                                                                    \
   V(Library)                                                                   \
   V(LibraryPrefix)                                                             \
+  V(Namespace)                                                                 \
   V(Code)                                                                      \
   V(Instructions)                                                              \
   V(PcDescriptors)                                                             \
@@ -722,8 +723,7 @@
   RawString* private_key_;
   RawArray* dictionary_;         // Top-level names in this library.
   RawArray* anonymous_classes_;  // Classes containing top-level elements.
-  RawArray* imports_;            // List of libraries imported without prefix.
-                                 // is imported into without a prefix.
+  RawArray* imports_;            // List of Namespaces imported without prefix.
   RawArray* loaded_scripts_;     // Array of scripts loaded in this library.
   RawObject** to() {
     return reinterpret_cast<RawObject**>(&ptr()->loaded_scripts_);
@@ -746,14 +746,29 @@
 
   RawObject** from() { return reinterpret_cast<RawObject**>(&ptr()->name_); }
   RawString* name_;               // library prefix name.
-  RawArray* libraries_;           // libraries imported with this prefix.
+  RawArray* imports_;             // libraries imported with this prefix.
   RawObject** to() {
-    return reinterpret_cast<RawObject**>(&ptr()->libraries_);
+    return reinterpret_cast<RawObject**>(&ptr()->imports_);
   }
-  intptr_t num_libs_;             // Number of library entries in libraries_.
+  intptr_t num_imports_;          // Number of library entries in libraries_.
 };
 
 
+class RawNamespace : public RawObject {
+  RAW_HEAP_OBJECT_IMPLEMENTATION(Namespace);
+
+  RawObject** from() {
+    return reinterpret_cast<RawObject**>(&ptr()->library_);
+  }
+  RawLibrary* library_;          // library with name dictionary.
+  RawArray* show_names_;         // list of names that are exported.
+  RawArray* hide_names_;         // blacklist of names that are not exported.
+  RawObject** to() {
+    return reinterpret_cast<RawObject**>(&ptr()->hide_names_);
+  }
+};
+
+
 class RawCode : public RawObject {
   RAW_HEAP_OBJECT_IMPLEMENTATION(Code);