Merge generics support in mscorlib

.runsettings

@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <RunSettings>
    <!-- Configurations that affect the Test Framework -->
    <RunConfiguration>
@@ -12,5 +12,6 @@
        <Logging>Verbose</Logging>
        <IsRealHardware>False</IsRealHardware>
 	   <RunnerExtraArguments> --forcegc </RunnerExtraArguments>
+       <UsePreviewClr>True</UsePreviewClr>
    </nanoFrameworkAdapter>
-</RunSettings>
+</RunSettings>

Tests/NFUnitTestGC/TestGC.cs

@@ -1,7 +1,8 @@
-// Licensed to the .NET Foundation under one or more agreements.
+// Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
 
+using System;
 using nanoFramework.TestFramework;
 
 namespace NFUnitTestGC
@@ -15,16 +16,14 @@ public void TestGCStress()
             int maxArraySize = 1024 * 32;
             object[] arrays = new object[600];
 
-            // Starting TestGCStress
-
             for (int loop = 0; loop < 100; loop++)
             {
                 OutputHelper.WriteLine($"Running iteration {loop}");
 
                 for (int i = 0; i < arrays.Length - 1;)
                 {
                     OutputHelper.WriteLine($"Alloc array of {maxArraySize} bytes @ pos {i}");
-                    arrays[i++] = new byte[maxArraySize]; ;
+                    arrays[i++] = new byte[maxArraySize];
 
                     OutputHelper.WriteLine($"Alloc array of 64 bytes @ pos {i}");
                     arrays[i++] = new byte[64];
@@ -37,8 +36,35 @@ public void TestGCStress()
                     arrays[i] = null;
                 }
             }
+        }
+
+        [TestMethod]
+        public void TestGetTotalMemory()
+        {
+            // create several objects
+            object[] objects = new object[100];
+
+            for (int i = 0; i < objects.Length; i++)
+            {
+                objects[i] = new object();
+            }
+
+            // get total memory
+            long totalMemory = GC.GetTotalMemory(false);
+            OutputHelper.WriteLine($"Total memory: {totalMemory} bytes");
+
+            // release objects
+            for (int i = 0; i < objects.Length; i++)
+            {
+                objects[i] = null;
+            }
+
+            // get total memory, forcing full collection
+            long totalMemoryAfterCollection = GC.GetTotalMemory(true);
+            OutputHelper.WriteLine($"Total memory: {totalMemoryAfterCollection} bytes");
 
-            // Completed TestGCStress
+            // check if memory was released
+            Assert.IsTrue(totalMemory > totalMemoryAfterCollection, "Memory was not released");
         }
     }
 }

Tests/NFUnitTestSystemLib/NFUnitTestSystemLib.nfproj

@@ -21,9 +21,12 @@
     <IsTestProject>true</IsTestProject>
     <TestProjectType>UnitTest</TestProjectType>
     <TargetFrameworkVersion>v1.0</TargetFrameworkVersion>
+    <LangVersion>13.0</LangVersion>
   </PropertyGroup>
   <Import Project="$(NanoFrameworkProjectSystemPath)NFProjectSystem.props" Condition="Exists('$(NanoFrameworkProjectSystemPath)NFProjectSystem.props')" />
   <ItemGroup>
+    <Compile Include="RuntimeHelpersTests.cs" />
+    <Compile Include="UnitTestNullable.cs" />
     <Compile Include="UnitTestUInt64.cs" />
     <Compile Include="UnitTestUInt32.cs" />
     <Compile Include="UnitTestSingle.cs" />
@@ -61,4 +64,4 @@
       <ProjectConfigurationsDeclaredAsItems />
     </ProjectCapabilities>
   </ProjectExtensions>
-</Project>
+</Project>

Tests/NFUnitTestSystemLib/RuntimeHelpersTests.cs

@@ -0,0 +1,68 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System;
+using System.Runtime.CompilerServices;
+using nanoFramework.TestFramework;
+
+namespace NFUnitTestSystemLib
+{
+    [TestClass]
+    class RuntimeHelpersTests
+    {
+        [TestMethod]
+        public static void IsReferenceOrContainsReferences()
+        {
+            Assert.IsFalse(RuntimeHelpers.IsReferenceOrContainsReferences<int>());
+            Assert.IsTrue(RuntimeHelpers.IsReferenceOrContainsReferences<string>());
+            Assert.IsFalse(RuntimeHelpers.IsReferenceOrContainsReferences<Guid>());
+            Assert.IsFalse(RuntimeHelpers.IsReferenceOrContainsReferences<StructWithoutReferences>());
+            Assert.IsTrue(RuntimeHelpers.IsReferenceOrContainsReferences<StructWithReferences>());
+            Assert.IsFalse(RuntimeHelpers.IsReferenceOrContainsReferences<RefStructWithoutReferences>());
+            Assert.IsTrue(RuntimeHelpers.IsReferenceOrContainsReferences<RefStructWithReferences>());
+            Assert.IsTrue(RuntimeHelpers.IsReferenceOrContainsReferences<Span<char>>());
+            Assert.IsTrue(RuntimeHelpers.IsReferenceOrContainsReferences<ReadOnlySpan<char>>());
+            //Assert.IsTrue(RuntimeHelpers.IsReferenceOrContainsReferences<RefStructWithRef>());
+            //Assert.IsTrue(RuntimeHelpers.IsReferenceOrContainsReferences<RefStructWithNestedRef>());
+        }
+
+        private struct StructWithoutReferences
+        {
+            public int a, b, c;
+        }
+
+        private struct StructWithReferences
+        {
+            public int a, b, c;
+            public object d;
+        }
+
+        private ref struct RefStructWithoutReferences
+        {
+            public int a;
+            public long b;
+        }
+
+        private ref struct RefStructWithReferences
+        {
+            public int a;
+            public object b;
+        }
+
+        // TODO: add after checking viability of ref fields in ref structs
+        //private ref struct RefStructWithRef
+        //{
+        //    public ref int a;
+
+        //    internal RefStructWithRef(ref int aVal)
+        //    {
+        //        a = ref aVal;
+        //    }
+        //}
+
+        //private ref struct RefStructWithNestedRef
+        //{
+        //    public Span<char> a;
+        //}
+    }
+}

Tests/NFUnitTestSystemLib/UnitTestGCTest.cs

@@ -9,6 +9,11 @@ namespace NFUnitTestSystemLib
     [TestClass]
     public class UnitTestGCTest
     {
+#pragma warning disable S1215 // this is intended to test the GC
+#pragma warning disable S1854 // this is intended to test the GC
+#pragma warning disable S2696 // this is intended to test the GC
+#pragma warning disable S3971 // this is intended to test the GC
+
         internal class FinalizeObject
         {
             public static FinalizeObject m_currentInstance = null;
@@ -54,17 +59,20 @@ public void SystemGC1_Test()
             /// 6. Verify that object has been collected
             /// </summary>
             ///
-            // Tests ReRegisterForFinalize
-            // Create a FinalizeObject.
+
+            OutputHelper.WriteLine("Tests ReRegisterForFinalize");
+            OutputHelper.WriteLine("Create a FinalizeObject.");
+
             FinalizeObject mfo = new FinalizeObject();
             m_hasFinalized1 = false;
             m_hasFinalized2 = false;
 
             // Release reference
+            OutputHelper.WriteLine("Release reference");
             mfo = null;
 
-            // Allow GC
-            GC.WaitForPendingFinalizers();
+            OutputHelper.WriteLine("Allow GC");
+            GC.Collect();
 
             int sleepTime = 1000;
             int slept = 0;
@@ -85,10 +93,10 @@ public void SystemGC1_Test()
             // FinalizeObject.m_currentInstance field.  Setting this value
             // to null and forcing another garbage collection will now
             // cause the object to Finalize permanently.
-            // Reregister and allow for GC
-            FinalizeObject.m_currentInstance = null;
 
-            GC.WaitForPendingFinalizers();
+            OutputHelper.WriteLine("Reregister and allow for GC");
+            FinalizeObject.m_currentInstance = null;
+            GC.Collect();
 
             sleepTime = 1000;
             slept = 0;
@@ -119,26 +127,27 @@ public void SystemGC2_Test()
             /// 6. Verify that object has not been collected
             /// </summary>
             ///
-            // Tests SuppressFinalize
-            // Create a FinalizeObject.
+
+            OutputHelper.WriteLine("Tests SuppressFinalize");
+            OutputHelper.WriteLine("Create a FinalizeObject");
             FinalizeObject mfo = new FinalizeObject();
             m_hasFinalized1 = false;
             m_hasFinalized2 = false;
 
-            // Releasing
+            OutputHelper.WriteLine("Releasing");
             GC.SuppressFinalize(mfo);
             mfo = null;
 
-            // Allow GC
-            GC.WaitForPendingFinalizers();
+            OutputHelper.WriteLine("Allow GC");
+            GC.Collect();
 
             int sleepTime = 1000;
             int slept = 0;
 
             while (!m_hasFinalized1 && slept < sleepTime)
             {
                 // force GC run caused by memory allocation
-                var dummyArray = new byte[1024 * 1024 * 1];
+                _ = new byte[1024 * 1024 * 1];
 
                 System.Threading.Thread.Sleep(10);
                 slept += 10;
@@ -161,59 +170,35 @@ public void SystemGC3_Test()
             /// </summary>
             ///
 
-            // Tests WaitForPendingFinalizers, dependant on test 1
-            // will auto-fail if test 1 fails.
             OutputHelper.Write("Tests WaitForPendingFinalizers, dependant on test 1");
-            OutputHelper.WriteLine("will auto-fail if test 1 fails.");
+            OutputHelper.WriteLine("will fail if test 1 fails.");
 
-            Assert.IsTrue(m_Test1Result);
+            Assert.IsTrue(m_Test1Result, "Can't run this test as SystemGC1_Test has failed.");
 
-            // Create a FinalizeObject.
+            OutputHelper.WriteLine("Create a FinalizeObject");
             FinalizeObject mfo = new FinalizeObject();
             m_hasFinalized1 = false;
             m_hasFinalized2 = false;
 
-            // Releasing
+            OutputHelper.WriteLine("Releasing");
             mfo = null;
 
-            int sleepTime = 1000;
-            int slept = 0;
-
-            while (!m_hasFinalized1 && slept < sleepTime)
-            {
-                // force GC run caused by memory allocation
-                var dummyArray = new byte[1024 * 1024 * 1];
-
-                System.Threading.Thread.Sleep(10);
-                slept += 10;
-            }
-
-            OutputHelper.WriteLine($"GC took {slept}");
-
-            // Wait for GC
+            OutputHelper.WriteLine("Wait for GC");
+            GC.Collect();
             GC.WaitForPendingFinalizers();
 
-            // Releasing again
+            OutputHelper.WriteLine("Releasing again");
             FinalizeObject.m_currentInstance = null;
 
-            sleepTime = 1000;
-            slept = 0;
-
-            while (!m_hasFinalized2 && slept < sleepTime)
-            {
-                // force GC run caused by memory allocation
-                var dummyArray = new byte[1024 * 1024 * 1];
-
-                System.Threading.Thread.Sleep(10);
-                slept += 10;
-            }
-
-            OutputHelper.WriteLine($"GC took {slept}");
-
-            // Wait for GC
+            OutputHelper.WriteLine("Wait for GC");
+            GC.Collect();
             GC.WaitForPendingFinalizers();
 
             Assert.IsTrue(m_hasFinalized2);
         }
     }
+#pragma warning restore S1215 // "GC.Collect" should not be called
+#pragma warning restore S1854 // Unused assignments should be removed
+#pragma warning restore S2696 // Instance members should not write to "static" fields
+#pragma warning restore S3971 // "GC.SuppressFinalize" should not be called
 }