Fixed bug in typemaps which caused derived_byvalue and rname test cases to fail.

git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk@9648 626c5289-ae23-0410-ae9c-e8d60b6d4f22

Examples/test-suite/derived_byvalue.i

@@ -31,11 +31,61 @@ struct Bar {
   
   if the derived class is deleted, it works again 
 
-  if the previos Foo::method
+  if the previous Foo::method is deleted, it works again
 
  */
 struct DerFoo : Foo {
 };
 
+/*
+  The problem is caused by accidentally remembering a object value type
+  instead of an object pointer type.
+  During the course of SWIGing a file, several calls to SwigType_remember()
+  or SwigType_remember_clientdata() will be made.
+  When the SwigType_emit_type_table() function is called it emits all the
+  type conversion functions.
+  
+  If a object type exists in the SwigType table, you get this error.
+
+  You can view the SwigType table, with a #define DEBUG at the top of
+  Source/Swig/typesys.c
+
+  When run you get an output like this:
+
+---r_mangled---
+Hash {
+    '_p_Bar' : Hash {
+        'p.Bar' : _p_Bar, 
+    }
+, 
+    '_p_DerFoo' : Hash {
+        'p.DerFoo' : _p_DerFoo, 
+    }
+, 
+    '_p_Foo' : Hash {
+        'r.Foo' : _p_Foo, 
+        'p.Foo' : _p_Foo, 
+    }
+, 
+    '_Foo' : Hash {
+        'Foo' : _Foo, 
+    }
+, 
+}
+....
+
+  The last field ('_Foo') is an object type and caused the error.
+  It can be fixed either by checking all the calls to SwigType_remember()
+  and by checking the typemaps.
+  The typemap code also calls SwigType_remember(), if your typemaps
+  defined an object type, it will be added into the SwigType table.
+  its normally a 
+    SWIG_ConvertPtr(....$descriptor...)
+  when it should have been a $&descriptor or $*descriptor
+    
+  Commenting out all your object typemaps (and typecheck fns) may help
+  isolate it.
+
+*/
 #
 %}