include read of superclass expression in control flow graph

python/src/com/jetbrains/python/codeInsight/controlflow/PyControlFlowBuilder.java

@@ -46,6 +46,9 @@ public class PyControlFlowBuilder extends PyRecursiveElementVisitor {
   public void visitPyClass(final PyClass node) {
     // Create node and stop here
     myBuilder.startNode(node);
+    for (PsiElement element : node.getSuperClassExpressions()) {
+      element.accept(this);
+    }
     final ReadWriteInstruction instruction = ReadWriteInstruction.write(myBuilder, node, node.getName());
     myBuilder.addNode(instruction);
     myBuilder.checkPending(instruction);
@@ -436,10 +439,10 @@ public class PyControlFlowBuilder extends PyRecursiveElementVisitor {
       pendingBackup.addAll(myBuilder.pending);
       myBuilder.pending = emptyMutableList();
       myBuilder.flowAbrupted();
-      final Instruction exceptInstrcution = myBuilder.startNode(exceptPart);
+      final Instruction exceptInstruction = myBuilder.startNode(exceptPart);
       exceptPart.accept(this);
       myBuilder.addPendingEdge(node, myBuilder.prevInstruction);
-      exceptInstructions.add(exceptInstrcution);
+      exceptInstructions.add(exceptInstruction);
     }
     for (Pair<PsiElement, Instruction> pair : pendingBackup) {
       myBuilder.addPendingEdge(pair.first, pair.second);

python/testData/codeInsight/controlflow/superclass.py

@@ -0,0 +1,9 @@
+class Foo:
+  def __init__(self):
+    pass
+
+class Bar(Foo):
+  pass
+
+Bar()
+#<ref>

python/testData/codeInsight/controlflow/superclass.txt

@@ -0,0 +1,9 @@
+0(1) element: null
+1(2) element: PyClass: Foo
+2(3) WRITE ACCESS: Foo
+3(4) element: PyClass: Bar
+4(5) READ ACCESS: Foo
+5(6) WRITE ACCESS: Bar
+6(7) element: PyExpressionStatement
+7(8) READ ACCESS: Bar
+8() element: null

python/testSrc/com/jetbrains/python/PyControlFlowBuilderTest.java

@@ -152,6 +152,10 @@ public class PyControlFlowBuilderTest extends LightMarkedTestCase {
   public void testManyIfs() {
     doTest();
   }
+  
+  public void testSuperclass() {
+    doTest();
+  }
 
   public void testQualifiedSelfReference() {
     final String testName = getTestName(false).toLowerCase();