Exclude code dealing with System.Numeric.Vector`1 from CPAOT compilation (#6527)

I have added a new field layout algorithm for Vector<T> and checks
to abort method compilation when it tries to access this information.

src/ILCompiler.Compiler/src/Compiler/CompilerTypeSystemContext.cs

@@ -27,7 +27,7 @@ namespace ILCompiler
         private ArrayOfTRuntimeInterfacesAlgorithm _arrayOfTRuntimeInterfacesAlgorithm;
         private MetadataVirtualMethodAlgorithm _virtualMethodAlgorithm = new MetadataVirtualMethodAlgorithm();
 
-        private SimdHelper _simdHelper;
+        protected SimdHelper _simdHelper;
 
         private TypeDesc[] _arrayOfTInterfaces;
         

src/ILCompiler.ReadyToRun/src/Compiler/ReadyToRunCodegenCompilation.cs

@@ -128,6 +128,10 @@ namespace ILCompiler
                     // If compilation fails, don't emit code for this method. It will be Jitted at runtime
                     Logger.Writer.WriteLine($"Warning: Method `{method}` was not compiled because: {ex.Message}");
                 }
+                catch (RequiresRuntimeJitException ex)
+                {
+                    Logger.Writer.WriteLine($"Info: Method `{method}` was not compiled because `{ex.Message}` requires runtime JIT");
+                }
             }
         }
     }

src/ILCompiler.ReadyToRun/src/Compiler/ReadyToRunCompilerContext.cs

@@ -14,12 +14,14 @@ namespace ILCompiler
     {
         private FieldLayoutAlgorithm _r2rFieldLayoutAlgorithm;
         private SystemObjectFieldLayoutAlgorithm _systemObjectFieldLayoutAlgorithm;
+        private VectorFieldLayoutAlgorithm _vectorFieldLayoutAlgorithm;
 
         public ReadyToRunCompilerContext(TargetDetails details, SharedGenericsMode genericsMode)
             : base(details, genericsMode)
         {
             _r2rFieldLayoutAlgorithm = new ReadyToRunMetadataFieldLayoutAlgorithm();
             _systemObjectFieldLayoutAlgorithm = new SystemObjectFieldLayoutAlgorithm(_r2rFieldLayoutAlgorithm);
+            _vectorFieldLayoutAlgorithm = new VectorFieldLayoutAlgorithm(_r2rFieldLayoutAlgorithm);
         }
 
         public override FieldLayoutAlgorithm GetLayoutAlgorithmForType(DefType type)
@@ -30,10 +32,10 @@ namespace ILCompiler
                 throw new NotImplementedException();
             else if (type.IsRuntimeDeterminedType)
                 throw new NotImplementedException();
-            /* TODO
             else if (_simdHelper.IsVectorOfT(type))
-                throw new NotImplementedException();
-            */
+            {
+                return _vectorFieldLayoutAlgorithm;
+            }
             else
             {
                 Debug.Assert(_r2rFieldLayoutAlgorithm != null);
@@ -70,5 +72,56 @@ namespace ILCompiler
         {
             return BaseTypeRuntimeInterfacesAlgorithm.Instance;
         }
+
+        private class VectorFieldLayoutAlgorithm : FieldLayoutAlgorithm
+        {
+            private FieldLayoutAlgorithm _fallbackAlgorithm;
+
+            public VectorFieldLayoutAlgorithm(FieldLayoutAlgorithm fallbackAlgorithm)
+            {
+                _fallbackAlgorithm = fallbackAlgorithm;
+            }
+
+            public override bool ComputeContainsGCPointers(DefType type)
+            {
+                return _fallbackAlgorithm.ComputeContainsGCPointers(type);
+            }
+
+            public override DefType ComputeHomogeneousFloatAggregateElementType(DefType type)
+            {
+                return _fallbackAlgorithm.ComputeHomogeneousFloatAggregateElementType(type);
+            }
+
+            public override ComputedInstanceFieldLayout ComputeInstanceLayout(DefType type, InstanceLayoutKind layoutKind)
+            {
+                List<FieldAndOffset> fieldsAndOffsets = new List<FieldAndOffset>();
+                foreach (FieldDesc field in type.GetFields())
+                {
+                    if (!field.IsStatic)
+                    {
+                        fieldsAndOffsets.Add(new FieldAndOffset(field, LayoutInt.Indeterminate));
+                    }
+                }
+                ComputedInstanceFieldLayout instanceLayout = new ComputedInstanceFieldLayout()
+                {
+                    FieldSize = LayoutInt.Indeterminate,
+                    FieldAlignment = LayoutInt.Indeterminate,
+                    ByteCountUnaligned = LayoutInt.Indeterminate,
+                    ByteCountAlignment = LayoutInt.Indeterminate,
+                    Offsets = fieldsAndOffsets.ToArray(),
+                };
+                return instanceLayout;
+            }
+
+            public override ComputedStaticFieldLayout ComputeStaticFieldLayout(DefType type, StaticLayoutKind layoutKind)
+            {
+                return _fallbackAlgorithm.ComputeStaticFieldLayout(type, layoutKind);
+            }
+
+            public override ValueTypeShapeCharacteristics ComputeValueTypeShapeCharacteristics(DefType type)
+            {
+                return _fallbackAlgorithm.ComputeValueTypeShapeCharacteristics(type);
+            }
+        }
     }
 }

src/ILCompiler.ReadyToRun/src/JitInterface/CorInfoImpl.ReadyToRun.cs

@@ -28,6 +28,14 @@ namespace Internal.JitInterface
         }
     }
 
+    public class RequiresRuntimeJitException : Exception
+    {
+        public RequiresRuntimeJitException(object reason)
+            : base(reason.ToString())
+        {
+        }
+    }
+
     unsafe partial class CorInfoImpl
     {
         private const CORINFO_RUNTIME_ABI TargetABI = CORINFO_RUNTIME_ABI.CORINFO_CORECLR_ABI;

src/JitInterface/src/CorInfoImpl.cs

@@ -187,6 +187,13 @@ namespace Internal.JitInterface
                             // Type system exceptions can be turned into code that throws the exception at runtime.
                             _lastException.Throw();
                         }
+#if READYTORUN
+                        else if (_lastException.SourceException is RequiresRuntimeJitException)
+                        {
+                            // Runtime JIT requirement is not a cause for failure, we just mustn't JIT a particular method
+                            _lastException.Throw();
+                        }
+#endif
                         else
                         {
                             // This is just a bug somewhere.
@@ -1220,7 +1227,14 @@ namespace Internal.JitInterface
         private uint getClassSize(CORINFO_CLASS_STRUCT_* cls)
         {
             TypeDesc type = HandleToObject(cls);
-            return (uint)type.GetElementSize().AsInt;
+            LayoutInt classSize = type.GetElementSize();
+#if READYTORUN
+            if (classSize.IsIndeterminate)
+            {
+                throw new RequiresRuntimeJitException(type);
+            }
+#endif
+            return (uint)classSize.AsInt;
         }
 
         private uint getHeapClassSize(CORINFO_CLASS_STRUCT_* cls)

tests/src/Simple/ReadyToRunUnit/Program.cs

@@ -5,6 +5,7 @@
 using System;
 using System.Collections.Generic;
 using System.IO;
+using System.Numerics;
 using System.Text;
 
 internal class ClassWithStatic
@@ -627,6 +628,27 @@ internal class Program
         return result;
     }
 
+    private static bool VectorTestOf<T>(T value1, T value2, T sum)
+        where T : struct
+    {
+        Console.WriteLine("Constructing vector of {0}", value1);
+        Vector<T> vector1 = new Vector<T>(value1);
+        Console.WriteLine("Vector[0] = {0}", vector1[0]);
+        Vector<T> vector2 = new Vector<T>(value2);
+        Vector<T> vectorSum = vector1 + vector2;
+        Console.WriteLine("Vector sum = {0}, {1} expected", vectorSum[0], sum);
+        return vectorSum[0].Equals(sum);
+    }
+
+    private static bool VectorTest()
+    {
+        bool success = true;
+        success &= VectorTestOf<int>(10, 20, 30);
+        success &= VectorTestOf<float>(15.0f, 30.0f, 45.0f);
+        success &= VectorTestOf<double>(50.0, 100.0, 150.0);
+        return success;
+    }
+
     public static int Main(string[] args)
     {
         if (args.Length > 0)
@@ -671,6 +693,7 @@ internal class Program
         RunTest("ThisObjGenericLookupTest", ThisObjGenericLookupTest());
         RunTest("ClassParamGenericLookupTest", ClassParamGenericLookupTest());
         RunTest("MethodParamGenericLookupTest", MethodParamGenericLookupTest());
+        RunTest("VectorTest", VectorTest());
 
         Console.WriteLine($@"{_passedTests.Count} tests pass:");
         foreach (string testName in _passedTests)

tests/src/Simple/ReadyToRunUnit/methodWhiteList.txt

@@ -1,4 +1,5 @@
 Program..cctor()
+Program.VectorTestOf(!!0,!!0,!!0)
 Program+DisposeStruct..cctor()
 Program+DisposeClass.Dispose()
 Program+DisposeClass..cctor()