Adding JIT regression test for a re-morph optimization.

diff --git a/tests/src/JIT/Regression/JitBlue/DevDiv_142976/DevDiv_142976.cs b/tests/src/JIT/Regression/JitBlue/DevDiv_142976/DevDiv_142976.cs
new file mode 100644 (file)
index 0000000..7b01517
--- /dev/null
+++ b/tests/src/JIT/Regression/JitBlue/DevDiv_142976/DevDiv_142976.cs
@@ -0,0 +1,56 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+
+using System;
+using System.Runtime.CompilerServices;
+
+// This test case is meant to test an optimization in morph that
+// transforms helper call JIT_Stelem_Ref(a, null, i) to a[i] = null,
+// which further gets transformed into an array address and bounds 
+// check nodes with references to the array local and the index
+// local.  It is expected while doing such a transform, array
+// local and index local are appropriately ref counted and Value
+// number is updated post-global-morph and jit compilation 
+// won't run into any asserts.
+class DevDiv_142976
+{
+    [MethodImpl(MethodImplOptions.NoInlining)]
+    public static String Foo()
+    {
+        return null;
+    }
+
+    [MethodImpl(MethodImplOptions.NoInlining)]
+    public static void Bar()
+    {
+        String[] args = new String[10];
+        if (args != null) 
+        {
+            throw new Exception();
+        }
+
+        String s = Foo();
+        if (s == null)
+        {
+            // This will result in JIT_Stelem_Ref(args, null, 0) call
+            // which gets re-morphed into args[0] = null.
+            args[0] = s;
+        }
+    }
+
+    public static int Main()
+    {
+        try
+        {
+            Bar();
+        }
+        catch (Exception)
+        {
+        }
+      
+        Console.WriteLine("Pass");
+        return 100;
+    }
+}
\ No newline at end of file

diff --git a/tests/src/JIT/Regression/JitBlue/DevDiv_142976/DevDiv_142976.csproj b/tests/src/JIT/Regression/JitBlue/DevDiv_142976/DevDiv_142976.csproj
new file mode 100644 (file)
index 0000000..0c1a10e
--- /dev/null
+++ b/tests/src/JIT/Regression/JitBlue/DevDiv_142976/DevDiv_142976.csproj
@@ -0,0 +1,46 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="12.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.props))\dir.props" />
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <AssemblyName>$(MSBuildProjectName)</AssemblyName>
+    <SchemaVersion>2.0</SchemaVersion>
+    <ProjectGuid>{95DFC527-4DC1-495E-97D7-E94EE1F7140D}</ProjectGuid>
+    <OutputType>Exe</OutputType>
+    <AppDesignerFolder>Properties</AppDesignerFolder>
+    <FileAlignment>512</FileAlignment>
+    <ProjectTypeGuids>{786C830F-07A1-408B-BD7F-6EE04809D6DB};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
+    <ReferencePath>$(ProgramFiles)\Common Files\microsoft shared\VSTT\11.0\UITestExtensionPackages</ReferencePath>
+    <SolutionDir Condition="$(SolutionDir) == '' Or $(SolutionDir) == '*Undefined*'">..\..\</SolutionDir>
+
+    <NuGetPackageImportStamp>7a9bfb7d</NuGetPackageImportStamp>
+  </PropertyGroup>
+  <!-- Default configurations to help VS understand the configurations -->
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+  </PropertyGroup>
+  <ItemGroup>
+    <CodeAnalysisDependentAssemblyPaths Condition=" '$(VS100COMNTOOLS)' != '' " Include="$(VS100COMNTOOLS)..\IDE\PrivateAssemblies">
+      <Visible>False</Visible>
+    </CodeAnalysisDependentAssemblyPaths>
+  </ItemGroup>
+  <PropertyGroup>
+    <DebugType></DebugType>
+    <Optimize>True</Optimize>
+  </PropertyGroup>
+  <ItemGroup>
+    <Compile Include="DevDiv_142976.cs" />
+  </ItemGroup>
+  <ItemGroup>
+    <Service Include="{82A7F48D-3B50-4B1E-B82E-3ADA8210C358}" />
+  </ItemGroup>
+  <PropertyGroup>
+    <ProjectJson>$(JitPackagesConfigFileDirectory)minimal\project.json</ProjectJson>
+    <ProjectLockJson>$(JitPackagesConfigFileDirectory)minimal\project.lock.json</ProjectLockJson>
+  </PropertyGroup>
+  <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.targets))\dir.targets" />
+  <PropertyGroup Condition=" '$(MsBuildProjectDirOverride)' != '' ">
+  </PropertyGroup> 
+</Project>