diff --git a/ICSharpCode.NRefactory.CSharp/ICSharpCode.NRefactory.CSharp.csproj b/ICSharpCode.NRefactory.CSharp/ICSharpCode.NRefactory.CSharp.csproj
index 433a2feb8d..8cf58882ed 100644
--- a/ICSharpCode.NRefactory.CSharp/ICSharpCode.NRefactory.CSharp.csproj
+++ b/ICSharpCode.NRefactory.CSharp/ICSharpCode.NRefactory.CSharp.csproj
@@ -401,6 +401,7 @@
+
diff --git a/ICSharpCode.NRefactory.CSharp/Refactoring/CodeIssues/IncorrectCallToObjectGetHashCodeIssue.cs b/ICSharpCode.NRefactory.CSharp/Refactoring/CodeIssues/IncorrectCallToObjectGetHashCodeIssue.cs
new file mode 100644
index 0000000000..c034f9ddc3
--- /dev/null
+++ b/ICSharpCode.NRefactory.CSharp/Refactoring/CodeIssues/IncorrectCallToObjectGetHashCodeIssue.cs
@@ -0,0 +1,90 @@
+//
+// IncorrectCallToObjectGetHashCodeIssue.cs
+//
+// Author:
+// Simon Lindgren
+//
+// Copyright (c) 2012 Simon Lindgren
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+using System.Collections.Generic;
+using ICSharpCode.NRefactory.TypeSystem;
+using ICSharpCode.NRefactory.Semantics;
+
+namespace ICSharpCode.NRefactory.CSharp.Refactoring
+{
+ [IssueDescription("Call resolves to Object.GetHashCode, which is reference based",
+ Description = "Finds calls to Object.GetHashCode inside overridden GetHashCode.",
+ Category = IssueCategories.CodeQualityIssues,
+ Severity = Severity.Warning)]
+ public class IncorrectCallToObjectGetHashCodeIssue : ICodeIssueProvider
+ {
+ public IEnumerable GetIssues(BaseRefactoringContext context)
+ {
+ return new GatherVisitor(context).GetIssues();
+ }
+
+ class GatherVisitor : GatherVisitorBase
+ {
+ IType objectType;
+
+ public GatherVisitor(BaseRefactoringContext context) : base (context)
+ {
+ objectType = context.Compilation.FindType(KnownTypeCode.Object);
+ }
+
+ public override void VisitMethodDeclaration(MethodDeclaration methodDeclaration)
+ {
+ // Check that this declaration is a GetHashCode override, _then_ recurse
+
+ if (methodDeclaration.Name != "GetHashCode") {
+ return;
+ }
+ if (!methodDeclaration.Modifiers.HasFlag(Modifiers.Override)) {
+ return;
+ }
+
+ base.VisitMethodDeclaration(methodDeclaration);
+ }
+
+ public override void VisitInvocationExpression(InvocationExpression invocationExpression)
+ {
+ base.VisitInvocationExpression(invocationExpression);
+
+ if (invocationExpression.Arguments.Count != 0) {
+ return;
+ }
+ var memberReference = invocationExpression.Target as MemberReferenceExpression;
+ if (memberReference == null) {
+ return;
+ }
+ var targetedObject = memberReference.Target as BaseReferenceExpression;
+ if (targetedObject == null) {
+ return;
+ }
+ var resolveResult = ctx.Resolve(targetedObject) as ThisResolveResult;
+ if (resolveResult == null || resolveResult.Type != objectType) {
+ return;
+ }
+ AddIssue(invocationExpression, ctx.TranslateString("Call resolves to Object.GetHashCode, which is reference based"));
+ }
+ }
+ }
+}
+
diff --git a/ICSharpCode.NRefactory.Tests/CSharp/CodeIssues/IncorrectCallToGetHashCodeTests.cs b/ICSharpCode.NRefactory.Tests/CSharp/CodeIssues/IncorrectCallToGetHashCodeTests.cs
new file mode 100644
index 0000000000..2ec6c70d0a
--- /dev/null
+++ b/ICSharpCode.NRefactory.Tests/CSharp/CodeIssues/IncorrectCallToGetHashCodeTests.cs
@@ -0,0 +1,69 @@
+//
+// IncorrectCallToGetHashCodeTests.cs
+//
+// Author:
+// Simon Lindgren
+//
+// Copyright (c) 2012 Simon Lindgren
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+using System;
+using NUnit.Framework;
+using ICSharpCode.NRefactory.CSharp.CodeActions;
+using ICSharpCode.NRefactory.CSharp.Refactoring;
+
+namespace ICSharpCode.NRefactory.CSharp.CodeIssues
+{
+ [TestFixture]
+ public class IncorrectCallToGetHashCodeTests : InspectionActionTestBase
+ {
+ [Test]
+ public void SimpleCase()
+ {
+ var input = @"
+class Foo
+{
+ public override int GetHashCode()
+ {
+ return base.GetHashCode();
+ }
+}";
+ TestRefactoringContext context;
+ var issues = GetIssues(new IncorrectCallToObjectGetHashCodeIssue(), input, out context);
+ Assert.AreEqual(1, issues.Count);
+ }
+
+ [Test]
+ public void DoesNotCheckOutsideOverriddenGetHashCode()
+ {
+ var input = @"
+class Foo
+{
+ public void Bar()
+ {
+ return base.GetHashCode();
+ }
+}";
+ TestRefactoringContext context;
+ var issues = GetIssues(new IncorrectCallToObjectGetHashCodeIssue(), input, out context);
+ Assert.AreEqual(0, issues.Count);
+ }
+ }
+}
+
diff --git a/ICSharpCode.NRefactory.Tests/ICSharpCode.NRefactory.Tests.csproj b/ICSharpCode.NRefactory.Tests/ICSharpCode.NRefactory.Tests.csproj
index 028ee1358f..828ae243f3 100644
--- a/ICSharpCode.NRefactory.Tests/ICSharpCode.NRefactory.Tests.csproj
+++ b/ICSharpCode.NRefactory.Tests/ICSharpCode.NRefactory.Tests.csproj
@@ -296,6 +296,7 @@
+