set super class for BufferedReader

Author: qunaibit

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/modules/io/IOModuleBuiltins.java

@@ -47,6 +47,8 @@
 import com.oracle.graal.python.builtins.Builtin;
 import com.oracle.graal.python.builtins.CoreFunctions;
 import com.oracle.graal.python.builtins.PythonBuiltins;
+import com.oracle.graal.python.builtins.objects.module.PythonModule;
+import com.oracle.graal.python.builtins.objects.type.PythonAbstractClass;
 import com.oracle.graal.python.nodes.function.PythonBuiltinBaseNode;
 import com.oracle.graal.python.nodes.function.PythonBuiltinNode;
 import com.oracle.graal.python.runtime.PythonCore;
@@ -69,6 +71,14 @@ public void initialize(PythonCore core) {
         builtinConstants.put("DEFAULT_BUFFER_SIZE", DEFAULT_BUFFER_SIZE);
     }
 
+    @Override
+    public void postInitialize(PythonCore core) {
+        super.postInitialize(core);
+        PythonModule ioModule = core.lookupBuiltinModule("_io");
+        PythonAbstractClass bufferediobase = (PythonAbstractClass) ioModule.getAttribute("BufferedIOBase");
+        core.lookupType(PBufferedReader).setSuperClass(bufferediobase);
+    }
+
     @Builtin(name = "BufferedReader", minNumOfPositionalArgs = 1, takesVarArgs = true, takesVarKeywordArgs = true, constructsClass = PBufferedReader)
     @GenerateNodeFactory
     public abstract static class BufferedReaderNode extends PythonBuiltinNode {