@Override
 public void visitReferenceExpression(final PsiReferenceExpression reference) {
   if (myLineRange.intersects(reference.getTextRange())) {
     final PsiElement psiElement = reference.resolve();
     if (psiElement instanceof PsiVariable) {
       final PsiVariable var = (PsiVariable) psiElement;
       if (var instanceof PsiField) {
         if (myCollectExpressions
             && !DebuggerUtils.hasSideEffectsOrReferencesMissingVars(
                 reference, myVisibleLocals)) {
           /*
           if (var instanceof PsiEnumConstant && reference.getQualifier() == null) {
             final PsiClass enumClass = ((PsiEnumConstant)var).getContainingClass();
             if (enumClass != null) {
               final PsiExpression expression = JavaPsiFacade.getInstance(var.getProject()).getParserFacade().createExpressionFromText(enumClass.getName() + "." + var.getName(), var);
               final PsiReference ref = expression.getReference();
               if (ref != null) {
                 ref.bindToElement(var);
                 myExpressions.add(new TextWithImportsImpl(expression));
               }
             }
           }
           else {
             myExpressions.add(new TextWithImportsImpl(reference));
           }
           */
           final PsiModifierList modifierList = var.getModifierList();
           boolean isConstant =
               (var instanceof PsiEnumConstant)
                   || (modifierList != null
                       && modifierList.hasModifierProperty(PsiModifier.STATIC)
                       && modifierList.hasModifierProperty(PsiModifier.FINAL));
           if (!isConstant) {
             myExpressions.add(new TextWithImportsImpl(reference));
           }
         }
       } else {
         if (myVisibleLocals.contains(var.getName())) {
           myVars.add(var.getName());
         } else {
           // fix for variables used in inner classes
           if (!Comparing.equal(
               PsiTreeUtil.getParentOfType(reference, PsiClass.class),
               PsiTreeUtil.getParentOfType(var, PsiClass.class))) {
             myExpressions.add(new TextWithImportsImpl(reference));
           }
         }
       }
     }
   }
   super.visitReferenceExpression(reference);
 }
 @Override
 public void visitArrayAccessExpression(final PsiArrayAccessExpression expression) {
   if (myCollectExpressions
       && !DebuggerUtils.hasSideEffectsOrReferencesMissingVars(expression, myVisibleLocals)) {
     myExpressions.add(new TextWithImportsImpl(expression));
   }
   super.visitArrayAccessExpression(expression);
 }
 private static Set<TextWithImports> computeExtraVars(
     Pair<Set<String>, Set<TextWithImports>> usedVars,
     SourcePosition sourcePosition,
     EvaluationContextImpl evalContext) {
   Set<String> alreadyCollected = new HashSet<String>(usedVars.first);
   for (TextWithImports text : usedVars.second) {
     alreadyCollected.add(text.getText());
   }
   Set<TextWithImports> extra = new HashSet<TextWithImports>();
   for (FrameExtraVariablesProvider provider :
       FrameExtraVariablesProvider.EP_NAME.getExtensions()) {
     if (provider.isAvailable(sourcePosition, evalContext)) {
       extra.addAll(provider.collectVariables(sourcePosition, evalContext, alreadyCollected));
     }
   }
   return extra;
 }
 @Override
 public void visitMethodCallExpression(final PsiMethodCallExpression expression) {
   if (myCollectExpressions) {
     final PsiMethod psiMethod = expression.resolveMethod();
     if (psiMethod != null
         && !DebuggerUtils.hasSideEffectsOrReferencesMissingVars(expression, myVisibleLocals)) {
       myExpressions.add(new TextWithImportsImpl(expression));
     }
   }
   super.visitMethodCallExpression(expression);
 }
 private void processVariable(final PsiVariable variable) {
   if (myLineRange.intersects(variable.getTextRange())
       && myVisibleLocals.contains(variable.getName())) {
     myVars.add(variable.getName());
   }
 }
  // copied from FrameVariablesTree
  private void buildVariables(
      DebuggerContextImpl debuggerContext,
      final EvaluationContextImpl evaluationContext,
      @NotNull DebugProcessImpl debugProcess,
      XValueChildrenList children,
      ObjectReference thisObjectReference,
      Location location)
      throws EvaluateException {
    final Set<String> visibleLocals = new HashSet<String>();
    if (NodeRendererSettings.getInstance().getClassRenderer().SHOW_VAL_FIELDS_AS_LOCAL_VARIABLES) {
      if (thisObjectReference != null
          && debugProcess.getVirtualMachineProxy().canGetSyntheticAttribute()) {
        final ReferenceType thisRefType = thisObjectReference.referenceType();
        if (thisRefType instanceof ClassType
            && location != null
            && thisRefType.equals(location.declaringType())
            && thisRefType.name().contains("$")) { // makes sense for nested classes only
          for (Field field : thisRefType.fields()) {
            if (DebuggerUtils.isSynthetic(field)
                && StringUtil.startsWith(
                    field.name(), FieldDescriptorImpl.OUTER_LOCAL_VAR_FIELD_PREFIX)) {
              final FieldDescriptorImpl fieldDescriptor =
                  myNodeManager.getFieldDescriptor(myDescriptor, thisObjectReference, field);
              children.add(JavaValue.create(fieldDescriptor, evaluationContext, myNodeManager));
              visibleLocals.add(fieldDescriptor.calcValueName());
            }
          }
        }
      }
    }

    boolean myAutoWatchMode = DebuggerSettings.getInstance().AUTO_VARIABLES_MODE;
    if (evaluationContext == null) {
      return;
    }
    final SourcePosition sourcePosition = debuggerContext.getSourcePosition();
    if (sourcePosition == null) {
      return;
    }

    try {
      if (!XDebuggerSettingsManager.getInstance().getDataViewSettings().isAutoExpressions()
          && !myAutoWatchMode) {
        // optimization
        superBuildVariables(evaluationContext, children);
      } else {
        final Map<String, LocalVariableProxyImpl> visibleVariables =
            getVisibleVariables(getStackFrameProxy());
        final Pair<Set<String>, Set<TextWithImports>> usedVars =
            ApplicationManager.getApplication()
                .runReadAction(
                    new Computable<Pair<Set<String>, Set<TextWithImports>>>() {
                      @Override
                      public Pair<Set<String>, Set<TextWithImports>> compute() {
                        return findReferencedVars(
                            ContainerUtil.union(visibleVariables.keySet(), visibleLocals),
                            sourcePosition);
                      }
                    });
        // add locals
        if (myAutoWatchMode) {
          for (String var : usedVars.first) {
            LocalVariableProxyImpl local = visibleVariables.get(var);
            if (local != null) {
              children.add(
                  JavaValue.create(
                      myNodeManager.getLocalVariableDescriptor(null, local),
                      evaluationContext,
                      myNodeManager));
            }
          }
        } else {
          superBuildVariables(evaluationContext, children);
        }
        final EvaluationContextImpl evalContextCopy =
            evaluationContext.createEvaluationContext(evaluationContext.getThisObject());
        evalContextCopy.setAutoLoadClasses(false);

        final Set<TextWithImports> extraVars =
            computeExtraVars(usedVars, sourcePosition, evaluationContext);

        // add extra vars
        addToChildrenFrom(extraVars, children, evaluationContext);

        // add expressions
        addToChildrenFrom(usedVars.second, children, evalContextCopy);
      }
    } catch (EvaluateException e) {
      if (e.getCause() instanceof AbsentInformationException) {
        children.add(
            new DummyMessageValueNode(
                MessageDescriptor.LOCAL_VARIABLES_INFO_UNAVAILABLE.getLabel(),
                XDebuggerUIConstants.INFORMATION_MESSAGE_ICON));
        // trying to collect values from variable slots
        try {
          for (Map.Entry<DecompiledLocalVariable, Value> entry :
              LocalVariablesUtil.fetchValues(getStackFrameProxy(), debugProcess).entrySet()) {
            children.add(
                JavaValue.create(
                    myNodeManager.getArgumentValueDescriptor(
                        null, entry.getKey(), entry.getValue()),
                    evaluationContext,
                    myNodeManager));
          }
        } catch (Exception ex) {
          LOG.info(ex);
        }
      } else {
        throw e;
      }
    }
  }