Remove more HelperMethodFrames (HMF) from Reflection (#109882)

Convert RuntimeTypeHandle.GetTypeFromHandle() to fast/slow paths.
Convert RuntimeTypeHandle.GetBaseType() to RuntimeType.GetParentType() QCall.
Consolidate Object.GetType() with RuntimeTypeHandle APIs.
Remove HMF from RuntimeFieldHandle.GetAttributes() and RuntimeFieldHandle.GetApproxDeclaringType().

src/coreclr/System.Private.CoreLib/src/System/Object.CoreCLR.cs

@@ -9,25 +9,14 @@ namespace System
 {
     public partial class Object
     {
-        [LibraryImport(RuntimeHelpers.QCall, EntryPoint = "ObjectNative_GetTypeSlow")]
-        private static unsafe partial void GetTypeSlow(MethodTable* methodTable, ObjectHandleOnStack ret);
-
         // Returns a Type object which represent this object instance.
         [Intrinsic]
         public unsafe Type GetType()
         {
             MethodTable* pMT = RuntimeHelpers.GetMethodTable(this);
-            Type type = pMT->AuxiliaryData->ExposedClassObject ?? GetTypeWorker(pMT);
+            RuntimeType type = RuntimeTypeHandle.GetRuntimeType(pMT);
             GC.KeepAlive(this);
             return type;
-
-            [MethodImpl(MethodImplOptions.NoInlining)]
-            static Type GetTypeWorker(MethodTable* pMT)
-            {
-                Type? type = null;
-                GetTypeSlow(pMT, ObjectHandleOnStack.Create(ref type));
-                return type!;
-            }
         }
 
         // Returns a new object instance that is a memberwise copy of this

src/coreclr/System.Private.CoreLib/src/System/Runtime/CompilerServices/RuntimeHelpers.CoreCLR.cs

@@ -98,7 +98,7 @@ private static unsafe ref byte GetSpanDataFrom(
             if (!RuntimeFieldHandle.GetRVAFieldInfo(fldInfo.Value, out void* data, out uint totalSize))
                 throw new ArgumentException(SR.Argument_BadFieldForInitializeArray);
 
-            TypeHandle th = targetTypeHandle.GetNativeTypeHandle();
+            TypeHandle th = targetTypeHandle.GetRuntimeType().GetNativeTypeHandle();
             Debug.Assert(!th.IsTypeDesc); // TypeDesc can't be used as generic parameter
             MethodTable* targetMT = th.AsMethodTable();
 

src/coreclr/System.Private.CoreLib/src/System/RuntimeHandles.cs

@@ -30,7 +30,39 @@ internal RuntimeType GetTypeChecked() =>
         /// </summary>
         /// <param name="value">An IntPtr handle to a RuntimeType to create a <see cref="RuntimeTypeHandle"/> object from.</param>
         /// <returns>A new <see cref="RuntimeTypeHandle"/> object that corresponds to the value parameter.</returns>
-        public static RuntimeTypeHandle FromIntPtr(IntPtr value) => new RuntimeTypeHandle(Type.GetTypeFromHandleUnsafe(value));
+        public static RuntimeTypeHandle FromIntPtr(IntPtr value) => new RuntimeTypeHandle(GetTypeFromHandle(value));
+
+        [LibraryImport(RuntimeHelpers.QCall, EntryPoint = "RuntimeTypeHandle_GetTypeFromHandleSlow")]
+        private static partial void GetTypeFromHandleSlow(
+            IntPtr handle,
+            ObjectHandleOnStack typeObject);
+
+        [MethodImpl(MethodImplOptions.NoInlining)]
+        private static RuntimeType GetTypeFromHandleSlow(IntPtr handle)
+        {
+            RuntimeType? typeObject = null;
+            GetTypeFromHandleSlow(handle, ObjectHandleOnStack.Create(ref typeObject));
+            return typeObject!;
+        }
+
+        [MethodImpl(MethodImplOptions.InternalCall)]
+        private static extern RuntimeType? GetTypeFromHandleIfExists(IntPtr handle);
+
+        private static RuntimeType? GetTypeFromHandle(IntPtr handle)
+        {
+            if (handle == IntPtr.Zero)
+            {
+                return null;
+            }
+
+            return GetTypeFromHandleIfExists(handle) ?? GetTypeFromHandleSlow(handle);
+        }
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        internal static unsafe RuntimeType GetRuntimeType(MethodTable* pMT)
+        {
+            return pMT->AuxiliaryData->ExposedClassObject ?? GetTypeFromHandleSlow((IntPtr)pMT);
+        }
 
         /// <summary>
         /// Returns the internal pointer representation of a <see cref="RuntimeTypeHandle"/> object.
@@ -49,7 +81,7 @@ internal RuntimeType GetTypeChecked() =>
         public static bool operator !=(object? left, RuntimeTypeHandle right) => !right.Equals(left);
 
         // This is the RuntimeType for the type
-        internal RuntimeType m_type;
+        internal RuntimeType? m_type;
 
         public override int GetHashCode()
             => m_type?.GetHashCode() ?? 0;
@@ -62,7 +94,7 @@ public bool Equals(RuntimeTypeHandle handle)
 
         public IntPtr Value => m_type?.m_handle ?? 0;
 
-        internal RuntimeTypeHandle(RuntimeType type)
+        internal RuntimeTypeHandle(RuntimeType? type)
         {
             m_type = type;
         }
@@ -72,11 +104,6 @@ internal bool IsNullHandle()
             return m_type == null;
         }
 
-        internal TypeHandle GetNativeTypeHandle()
-        {
-            return m_type.GetNativeTypeHandle();
-        }
-
         internal static bool IsTypeDefinition(RuntimeType type)
         {
             CorElementType corElemType = type.GetCorElementType();
@@ -304,7 +331,7 @@ private static object AllocateComObject(void* pClassFactory)
 
         internal RuntimeType GetRuntimeType()
         {
-            return m_type;
+            return m_type!;
         }
 
         internal static RuntimeAssembly GetAssembly(RuntimeType type)
@@ -347,12 +374,14 @@ static RuntimeModule GetModuleWorker(RuntimeType type)
 
         public ModuleHandle GetModuleHandle()
         {
+            if (m_type is null)
+            {
+                throw new ArgumentNullException(SR.Arg_InvalidHandle);
+            }
+
             return new ModuleHandle(GetModule(m_type));
         }
 
-        [MethodImpl(MethodImplOptions.InternalCall)]
-        internal static extern RuntimeType GetBaseType(RuntimeType type);
-
         [MethodImpl(MethodImplOptions.InternalCall)]
         internal static extern TypeAttributes GetAttributes(RuntimeType type);
 
@@ -1220,7 +1249,16 @@ internal static MdUtf8String GetUtf8Name(RuntimeFieldHandleInternal field)
         internal static extern FieldAttributes GetAttributes(RuntimeFieldHandleInternal field);
 
         [MethodImpl(MethodImplOptions.InternalCall)]
-        internal static extern RuntimeType GetApproxDeclaringType(RuntimeFieldHandleInternal field);
+        private static extern MethodTable* GetApproxDeclaringMethodTable(RuntimeFieldHandleInternal field);
+
+        internal static RuntimeType GetApproxDeclaringType(RuntimeFieldHandleInternal field)
+        {
+            Debug.Assert(!field.IsNullHandle());
+            MethodTable* pMT = GetApproxDeclaringMethodTable(field);
+            Debug.Assert(pMT != null);
+
+            return RuntimeTypeHandle.GetRuntimeType(pMT);
+        }
 
         internal static RuntimeType GetApproxDeclaringType(IRuntimeFieldInfo field)
         {

src/coreclr/System.Private.CoreLib/src/System/RuntimeType.BoxCache.cs

@@ -37,7 +37,7 @@ private BoxCache(RuntimeType rt)
                 _originalRuntimeType = rt;
 #endif
 
-                TypeHandle handle = rt.TypeHandle.GetNativeTypeHandle();
+                TypeHandle handle = rt.GetNativeTypeHandle();
 
                 if (handle.IsTypeDesc)
                     throw new ArgumentException(SR.Arg_TypeNotSupported);

src/coreclr/System.Private.CoreLib/src/System/RuntimeType.CoreCLR.cs

@@ -743,7 +743,7 @@ private unsafe RuntimeMethodInfo[] PopulateMethods(Filter filter)
                                 #endregion
                             }
 
-                            declaringType = RuntimeTypeHandle.GetBaseType(declaringType);
+                            declaringType = declaringType.GetParentType()!;
                         } while (declaringType != null);
                         #endregion
                     }
@@ -814,13 +814,14 @@ private RuntimeFieldInfo[] PopulateFields(Filter filter)
                     while (RuntimeTypeHandle.IsGenericVariable(declaringType))
                         declaringType = declaringType.GetBaseType()!;
 
-                    while (declaringType != null)
+                    RuntimeType? populatingType = declaringType;
+                    while (populatingType != null)
                     {
-                        PopulateRtFields(filter, declaringType, ref list);
+                        PopulateRtFields(filter, populatingType, ref list);
 
-                        PopulateLiteralFields(filter, declaringType, ref list);
+                        PopulateLiteralFields(filter, populatingType, ref list);
 
-                        declaringType = RuntimeTypeHandle.GetBaseType(declaringType);
+                        populatingType = populatingType.GetParentType();
                     }
                     #endregion
 
@@ -1152,10 +1153,11 @@ private RuntimeEventInfo[] PopulateEvents(Filter filter)
                             declaringType = declaringType.GetBaseType()!;
 
                         // Populate associates off of the class hierarchy
-                        while (declaringType != null)
+                        RuntimeType? populatingType = declaringType;
+                        while (populatingType != null)
                         {
-                            PopulateEvents(filter, declaringType, csEventInfos, ref list);
-                            declaringType = RuntimeTypeHandle.GetBaseType(declaringType);
+                            PopulateEvents(filter, populatingType, csEventInfos, ref list);
+                            populatingType = populatingType.GetParentType();
                         }
                     }
                     else
@@ -1261,11 +1263,12 @@ private RuntimePropertyInfo[] PopulateProperties(Filter filter)
                         }
 
                         // Populate associates off of the class hierarchy
-                        do
+                        RuntimeType? populatingType = declaringType;
+                        while (populatingType != null)
                         {
-                            PopulateProperties(filter, declaringType, csPropertyInfos, usedSlots, isInterface: false, ref list);
-                            declaringType = RuntimeTypeHandle.GetBaseType(declaringType);
-                        } while (declaringType != null);
+                            PopulateProperties(filter, populatingType, csPropertyInfos, usedSlots, isInterface: false, ref list);
+                            populatingType = populatingType.GetParentType();
+                        }
                     }
                     else
                     {
@@ -1778,6 +1781,28 @@ internal FieldInfo GetField(RuntimeFieldHandleInternal field)
         #region Static Members
 
         #region Internal
+
+        // Returns the type from which the current type directly inherits from (without reflection quirks).
+        // The parent type is null for interfaces, pointers, byrefs and generic parameters.
+        internal unsafe RuntimeType? GetParentType()
+        {
+            TypeHandle typeHandle = GetNativeTypeHandle();
+            if (typeHandle.IsTypeDesc)
+            {
+                return null;
+            }
+
+            MethodTable* pParentMT = typeHandle.AsMethodTable()->ParentMethodTable;
+            if (pParentMT == null)
+            {
+                return null;
+            }
+
+            RuntimeType result = RuntimeTypeHandle.GetRuntimeType(pParentMT);
+            GC.KeepAlive(this);
+            return result;
+        }
+
         [RequiresUnreferencedCode("Trimming changes metadata tokens")]
         internal static MethodBase? GetMethodBase(RuntimeModule scope, int typeMetadataToken)
         {

src/coreclr/System.Private.CoreLib/src/System/Type.CoreCLR.cs

@@ -78,10 +78,6 @@ public abstract partial class Type : MemberInfo, IReflect
                 throwOnError: throwOnError, ignoreCase: ignoreCase);
         }
 
-        // Given a class handle, this will return the class for that handle.
-        [MethodImpl(MethodImplOptions.InternalCall)]
-        internal static extern RuntimeType GetTypeFromHandleUnsafe(IntPtr handle);
-
         [Intrinsic]
         public static Type? GetTypeFromHandle(RuntimeTypeHandle handle)
             => handle.m_type;

src/coreclr/classlibnative/bcltype/objectnative.cpp

@@ -89,20 +89,6 @@ FCIMPL2(FC_BOOL_RET, ObjectNative::ContentEquals, Object *pThisRef, Object *pCom
 }
 FCIMPLEND
 
-extern "C" void QCALLTYPE ObjectNative_GetTypeSlow(MethodTable* pMT, QCall::ObjectHandleOnStack ret)
-{
-    QCALL_CONTRACT;
-    _ASSERTE(pMT != NULL);
-
-    BEGIN_QCALL;
-
-    GCX_COOP();
-
-    ret.Set(pMT->GetManagedClassObject());
-
-    END_QCALL;
-}
-
 extern "C" void QCALLTYPE ObjectNative_AllocateUninitializedClone(QCall::ObjectHandleOnStack objHandle)
 {
     QCALL_CONTRACT;

src/coreclr/classlibnative/bcltype/objectnative.h

@@ -30,7 +30,6 @@ class ObjectNative
 };
 
 extern "C" INT32 QCALLTYPE ObjectNative_GetHashCodeSlow(QCall::ObjectHandleOnStack objHandle);
-extern "C" void QCALLTYPE ObjectNative_GetTypeSlow(MethodTable* pMT, QCall::ObjectHandleOnStack ret);
 extern "C" void QCALLTYPE ObjectNative_AllocateUninitializedClone(QCall::ObjectHandleOnStack objHandle);
 extern "C" BOOL QCALLTYPE Monitor_Wait(QCall::ObjectHandleOnStack pThis, INT32 Timeout);
 extern "C" void QCALLTYPE Monitor_Pulse(QCall::ObjectHandleOnStack pThis);

src/coreclr/vm/ecalllist.h

@@ -81,18 +81,13 @@ FCFuncStart(gExceptionFuncs)
     FCFuncElement("GetExceptionCount", ExceptionNative::GetExceptionCount)
 FCFuncEnd()
 
-FCFuncStart(gSystem_Type)
-    FCFuncElement("GetTypeFromHandleUnsafe", RuntimeTypeHandle::GetRuntimeType)
-FCFuncEnd()
-
 FCFuncStart(gCOMTypeHandleFuncs)
     FCFuncElement("GetDeclaringMethod", RuntimeTypeHandle::GetDeclaringMethod)
     FCFuncElement("GetDeclaringType", RuntimeTypeHandle::GetDeclaringType)
     FCFuncElement("GetFirstIntroducedMethod", RuntimeTypeHandle::GetFirstIntroducedMethod)
     FCFuncElement("GetNextIntroducedMethod", RuntimeTypeHandle::GetNextIntroducedMethod)
     FCFuncElement("GetAssemblyIfExists", RuntimeTypeHandle::GetAssemblyIfExists)
     FCFuncElement("GetModuleIfExists", RuntimeTypeHandle::GetModuleIfExists)
-    FCFuncElement("GetBaseType", RuntimeTypeHandle::GetBaseType)
     FCFuncElement("GetElementType", RuntimeTypeHandle::GetElementType)
     FCFuncElement("GetArrayRank", RuntimeTypeHandle::GetArrayRank)
     FCFuncElement("GetToken", RuntimeTypeHandle::GetToken)
@@ -111,6 +106,7 @@ FCFuncStart(gCOMTypeHandleFuncs)
     FCFuncElement("IsUnmanagedFunctionPointer", RuntimeTypeHandle::IsUnmanagedFunctionPointer)
     FCFuncElement("CompareCanonicalHandles", RuntimeTypeHandle::CompareCanonicalHandles)
     FCFuncElement("IsEquivalentTo", RuntimeTypeHandle::IsEquivalentTo)
+    FCFuncElement("GetTypeFromHandleIfExists", RuntimeTypeHandle::GetTypeFromHandleIfExists)
 FCFuncEnd()
 
 FCFuncStart(gMetaDataImport)
@@ -176,7 +172,7 @@ FCFuncEnd()
 FCFuncStart(gCOMFieldHandleNewFuncs)
     FCFuncElement("GetUtf8NameInternal", RuntimeFieldHandle::GetUtf8Name)
     FCFuncElement("GetAttributes", RuntimeFieldHandle::GetAttributes)
-    FCFuncElement("GetApproxDeclaringType", RuntimeFieldHandle::GetApproxDeclaringType)
+    FCFuncElement("GetApproxDeclaringMethodTable", RuntimeFieldHandle::GetApproxDeclaringMethodTable)
     FCFuncElement("GetToken", RuntimeFieldHandle::GetToken)
     FCFuncElement("GetStaticFieldForGenericType", RuntimeFieldHandle::GetStaticFieldForGenericType)
     FCFuncElement("AcquiresContextFromThis", RuntimeFieldHandle::AcquiresContextFromThis)
@@ -433,7 +429,6 @@ FCClassElement("String", "System", gStringFuncs)
 FCClassElement("StubHelpers", "System.StubHelpers", gStubHelperFuncs)
 FCClassElement("Thread", "System.Threading", gThreadFuncs)
 FCClassElement("ThreadPool", "System.Threading", gThreadPoolFuncs)
-FCClassElement("Type", "System", gSystem_Type)
 
 #undef FCFuncElement
 #undef FCFuncElementSig

src/coreclr/vm/qcallentrypoints.cpp

@@ -108,7 +108,6 @@ static const Entry s_QCall[] =
     DllImportEntry(ExceptionNative_GetMethodFromStackTrace)
     DllImportEntry(ExceptionNative_ThrowAmbiguousResolutionException)
     DllImportEntry(ExceptionNative_ThrowEntryPointNotFoundException)
-    DllImportEntry(RuntimeTypeHandle_CreateInstanceForAnotherGenericParameter)
     DllImportEntry(QCall_GetGCHandleForTypeHandle)
     DllImportEntry(QCall_FreeGCHandleForTypeHandle)
     DllImportEntry(MethodTable_AreTypesEquivalent)
@@ -137,6 +136,8 @@ static const Entry s_QCall[] =
 #ifdef FEATURE_COMINTEROP
     DllImportEntry(RuntimeTypeHandle_AllocateComObject)
 #endif // FEATURE_COMINTEROP
+    DllImportEntry(RuntimeTypeHandle_GetTypeFromHandleSlow)
+    DllImportEntry(RuntimeTypeHandle_CreateInstanceForAnotherGenericParameter)
     DllImportEntry(RuntimeTypeHandle_AllocateTypeAssociatedMemory)
     DllImportEntry(RuntimeTypeHandle_RegisterCollectibleTypeDependency)
     DllImportEntry(MethodBase_GetCurrentMethod)
@@ -373,7 +374,6 @@ static const Entry s_QCall[] =
     DllImportEntry(FileLoadException_GetMessageForHR)
     DllImportEntry(Interlocked_MemoryBarrierProcessWide)
     DllImportEntry(ObjectNative_GetHashCodeSlow)
-    DllImportEntry(ObjectNative_GetTypeSlow)
     DllImportEntry(ObjectNative_AllocateUninitializedClone)
     DllImportEntry(Monitor_Wait)
     DllImportEntry(Monitor_Pulse)