Remove legacy APIs for MCG support

src/coreclr/System.Private.CoreLib/System.Private.CoreLib.csproj

@@ -196,7 +196,6 @@
     <Compile Include="$(BclSourcesRoot)\System\Reflection\TypeNameResolver.CoreCLR.cs" />
     <Compile Include="$(BclSourcesRoot)\System\Reflection\Metadata\RuntimeTypeMetadataUpdateHandler.cs" />
     <Compile Include="$(BclSourcesRoot)\System\Runtime\CompilerServices\CastHelpers.cs" />
-    <Compile Include="$(BclSourcesRoot)\System\Runtime\CompilerServices\ICastableHelpers.cs" />
     <Compile Include="$(BclSourcesRoot)\System\Runtime\CompilerServices\RuntimeHelpers.CoreCLR.cs" />
     <Compile Include="$(BclSourcesRoot)\System\Runtime\ControlledExecution.CoreCLR.cs" />
     <Compile Include="$(BclSourcesRoot)\System\Runtime\DependentHandle.cs" />

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

@@ -682,7 +682,6 @@ internal unsafe struct MethodTable
         // Types that require non-trivial interface cast have this bit set in the category
         private const uint enum_flag_NonTrivialInterfaceCast = 0x00080000 // enum_flag_Category_Array
                                                              | 0x40000000 // enum_flag_ComObject
-                                                             | 0x00400000 // enum_flag_ICastable;
                                                              | 0x10000000 // enum_flag_IDynamicInterfaceCastable;
                                                              | 0x00040000; // enum_flag_Category_ValueType
 

src/coreclr/clr.featuredefines.props

@@ -2,7 +2,6 @@
     <PropertyGroup>
         <FeatureCoreCLR>true</FeatureCoreCLR>
         <FeatureEventTrace>true</FeatureEventTrace>
-        <FeatureICastable>true</FeatureICastable>
         <FeaturePerfTracing>true</FeaturePerfTracing>
         <FeatureTypeEquivalence>true</FeatureTypeEquivalence>
         <ProfilingSupportedBuild>true</ProfilingSupportedBuild>
@@ -35,7 +34,6 @@
         <DefineConstants Condition="'$(FeaturePerfTracing)' == 'true'">$(DefineConstants);FEATURE_PERFTRACING</DefineConstants>
         <DefineConstants Condition="'$(FeatureXplatEventSource)' == 'true'">$(DefineConstants);FEATURE_EVENTSOURCE_XPLAT</DefineConstants>
         <DefineConstants Condition="'$(FeatureTypeEquivalence)' == 'true'">$(DefineConstants);FEATURE_TYPEEQUIVALENCE</DefineConstants>
-        <DefineConstants Condition="'$(FeatureICastable)' == 'true'">$(DefineConstants);FEATURE_ICASTABLE</DefineConstants>
         <DefineConstants Condition="'$(FeatureEHFunclets)' == 'true'">$(DefineConstants);FEATURE_EH_FUNCLETS</DefineConstants>
 
         <DefineConstants Condition="'$(ProfilingSupportedBuild)' == 'true'">$(DefineConstants);PROFILING_SUPPORTED</DefineConstants>

src/coreclr/clrdefinitions.cmake

@@ -122,7 +122,6 @@ endif(CLR_CMAKE_TARGET_LINUX)
 if(NOT CLR_CMAKE_TARGET_NETBSD)
     add_definitions(-DFEATURE_HIJACK)
 endif(NOT CLR_CMAKE_TARGET_NETBSD)
-add_definitions(-DFEATURE_ICASTABLE)
 if (CLR_CMAKE_TARGET_WIN32 AND (CLR_CMAKE_TARGET_ARCH_AMD64 OR CLR_CMAKE_TARGET_ARCH_I386 OR CLR_CMAKE_TARGET_ARCH_ARM64))
     add_definitions(-DFEATURE_INTEROP_DEBUGGING)
 endif (CLR_CMAKE_TARGET_WIN32 AND (CLR_CMAKE_TARGET_ARCH_AMD64 OR CLR_CMAKE_TARGET_ARCH_I386 OR CLR_CMAKE_TARGET_ARCH_ARM64))

src/coreclr/inc/dacvars.h

@@ -175,10 +175,6 @@ DEFINE_DACVAR(UNKNOWN_POINTER_TYPE, dac__g_pBaseCOMObject, ::g_pBaseCOMObject)
 
 DEFINE_DACVAR(UNKNOWN_POINTER_TYPE, dac__g_pIDynamicInterfaceCastableInterface, ::g_pIDynamicInterfaceCastableInterface)
 
-#ifdef FEATURE_ICASTABLE
-DEFINE_DACVAR(UNKNOWN_POINTER_TYPE, dac__g_pICastableInterface, ::g_pICastableInterface)
-#endif // FEATURE_ICASTABLE
-
 DEFINE_DACVAR(UNKNOWN_POINTER_TYPE, dac__g_pObjectFinalizerMD, ::g_pObjectFinalizerMD)
 
 DEFINE_DACVAR(bool, dac__g_fProcessDetach, ::g_fProcessDetach)

src/coreclr/vm/.vscode/c_cpp_properties.json

@@ -53,7 +53,6 @@
                 "FEATURE_DEFAULT_INTERFACES",
                 "FEATURE_EVENT_TRACE=1",
                 "FEATURE_HIJACK",
-                "FEATURE_ICASTABLE",
                 "FEATURE_INTEROP_DEBUGGING",
                 "FEATURE_ISYM_READER",
                 "FEATURE_MULTICASTSTUB_AS_IL",

src/coreclr/vm/appdomain.cpp

@@ -1268,10 +1268,6 @@ void SystemDomain::LoadBaseSystemClasses()
         }
     #endif
 
-    #ifdef FEATURE_ICASTABLE
-        g_pICastableInterface = CoreLibBinder::GetClass(CLASS__ICASTABLE);
-    #endif // FEATURE_ICASTABLE
-
 #ifdef FEATURE_EH_FUNCLETS
         g_pEHClass = CoreLibBinder::GetClass(CLASS__EH);
         g_pExceptionServicesInternalCallsClass = CoreLibBinder::GetClass(CLASS__EXCEPTIONSERVICES_INTERNALCALLS);

src/coreclr/vm/callconvbuilder.cpp

@@ -490,37 +490,23 @@ bool CallConv::TryGetCallingConventionFromUnmanagedCallersOnly(_In_ MethodDesc*
     BYTE* pData = NULL;
     LONG cData = 0;
 
-    bool nativeCallableInternalData = false;
     HRESULT hr = pMD->GetCustomAttribute(WellKnownAttribute::UnmanagedCallersOnly, (const VOID **)(&pData), (ULONG *)&cData);
-    if (hr == S_FALSE)
-    {
-        hr = pMD->GetCustomAttribute(WellKnownAttribute::NativeCallableInternal, (const VOID **)(&pData), (ULONG *)&cData);
-        nativeCallableInternalData = SUCCEEDED(hr);
-    }
-
     IfFailThrow(hr);
 
     _ASSERTE(cData > 0);
 
     CustomAttributeParser ca(pData, cData);
 
-    // UnmanagedCallersOnly and NativeCallableInternal each
+    // UnmanagedCallersOnly each
     // have optional named arguments.
     CaNamedArg namedArgs[2];
 
     // For the UnmanagedCallersOnly scenario.
     CaType caCallConvs;
 
     // Define attribute specific optional named properties
-    if (nativeCallableInternalData)
-    {
-        namedArgs[0].InitI4FieldEnum("CallingConvention", "System.Runtime.InteropServices.CallingConvention", (ULONG)(CorPinvokeMap)0);
-    }
-    else
-    {
-        caCallConvs.Init(SERIALIZATION_TYPE_SZARRAY, SERIALIZATION_TYPE_TYPE, SERIALIZATION_TYPE_UNDEFINED, NULL, 0);
-        namedArgs[0].Init("CallConvs", SERIALIZATION_TYPE_SZARRAY, caCallConvs);
-    }
+    caCallConvs.Init(SERIALIZATION_TYPE_SZARRAY, SERIALIZATION_TYPE_TYPE, SERIALIZATION_TYPE_UNDEFINED, NULL, 0);
+    namedArgs[0].Init("CallConvs", SERIALIZATION_TYPE_SZARRAY, caCallConvs);
 
     // Define common optional named properties
     CaTypeCtor caEntryPoint(SERIALIZATION_TYPE_STRING);
@@ -542,25 +528,17 @@ bool CallConv::TryGetCallingConventionFromUnmanagedCallersOnly(_In_ MethodDesc*
     if (namedArgs[0].val.type.tag == SERIALIZATION_TYPE_UNDEFINED)
         return false;
 
-    CorInfoCallConvExtension callConvLocal;
-    if (nativeCallableInternalData)
+    CallConvBuilder builder;
+    if (!TryGetCallingConventionFromTypeArray(&namedArgs[0].val, &builder))
     {
-        callConvLocal = (CorInfoCallConvExtension)(namedArgs[0].val.u4 << 8);
+        // We found a second base calling convention.
+        return false;
     }
-    else
-    {
-        CallConvBuilder builder;
-        if (!TryGetCallingConventionFromTypeArray(&namedArgs[0].val, &builder))
-        {
-            // We found a second base calling convention.
-            return false;
-        }
 
-        callConvLocal = builder.GetCurrentCallConv();
-        if (callConvLocal == CallConvBuilder::UnsetValue)
-        {
-            callConvLocal = CallConv::GetDefaultUnmanagedCallingConvention();
-        }
+    CorInfoCallConvExtension callConvLocal = builder.GetCurrentCallConv();
+    if (callConvLocal == CallConvBuilder::UnsetValue)
+    {
+        callConvLocal = CallConv::GetDefaultUnmanagedCallingConvention();
     }
 
     *pCallConv = callConvLocal;

src/coreclr/vm/corelib.h

@@ -1124,15 +1124,6 @@ DEFINE_FIELD_U(_condition,          ContractExceptionObject,    _Condition)
 
 DEFINE_CLASS(MODULEBASE,        Reflection,         Module)
 
-#ifdef FEATURE_ICASTABLE
-DEFINE_CLASS(ICASTABLE,         CompilerServices,   ICastable)
-
-DEFINE_CLASS(ICASTABLEHELPERS,  CompilerServices,   ICastableHelpers)
-DEFINE_METHOD(ICASTABLEHELPERS,        ISINSTANCEOF,       IsInstanceOfInterface, SM_ICastable_RtType_RefException_RetBool)
-DEFINE_METHOD(ICASTABLEHELPERS,        GETIMPLTYPE,        GetImplType, SM_ICastable_RtType_RetRtType)
-
-#endif // FEATURE_ICASTABLE
-
 DEFINE_CLASS(STACKALLOCATEDBOX,   CompilerServices,     StackAllocatedBox`1)
 
 DEFINE_CLASS(UTF8STRINGMARSHALLER, Marshalling, Utf8StringMarshaller)

src/coreclr/vm/jithelpers.cpp

@@ -1080,35 +1080,6 @@ BOOL ObjIsInstanceOfCore(Object *pObject, TypeHandle toTypeHnd, BOOL throwCastEx
         }
         else
 #endif // FEATURE_COMINTEROP
-#ifdef FEATURE_ICASTABLE
-        // If type implements ICastable interface we give it a chance to tell us if it can be casted
-        // to a given type.
-        if (pMT->IsICastable())
-        {
-            // Make actual call to ICastableHelpers.IsInstanceOfInterface(obj, interfaceTypeObj, out exception)
-            OBJECTREF exception = NULL;
-            GCPROTECT_BEGIN(exception);
-
-            PREPARE_NONVIRTUAL_CALLSITE(METHOD__ICASTABLEHELPERS__ISINSTANCEOF);
-
-            OBJECTREF managedType = toTypeHnd.GetManagedClassObject(); //GC triggers
-
-            DECLARE_ARGHOLDER_ARRAY(args, 3);
-            args[ARGNUM_0] = OBJECTREF_TO_ARGHOLDER(obj);
-            args[ARGNUM_1] = OBJECTREF_TO_ARGHOLDER(managedType);
-            args[ARGNUM_2] = PTR_TO_ARGHOLDER(&exception);
-
-            CALL_MANAGED_METHOD(fCast, BOOL, args);
-            INDEBUG(managedType = NULL); // managedType isn't protected during the call
-
-            if (!fCast && throwCastException && exception != NULL)
-            {
-                RealCOMPlusThrow(exception);
-            }
-            GCPROTECT_END(); //exception
-        }
-        else
-#endif // FEATURE_ICASTABLE
         if (pMT->IsIDynamicInterfaceCastable())
         {
             fCast = DynamicInterfaceCastable::IsInstanceOf(&obj, toTypeHnd, throwCastException);

src/coreclr/vm/jitinterface.cpp

@@ -4209,8 +4209,8 @@ TypeCompareState CEEInfo::compareTypesForCast(
     else
 #endif // FEATURE_COMINTEROP
 
-    // If casting from ICastable or IDynamicInterfaceCastable, don't try to optimize
-    if (fromHnd.GetMethodTable()->IsICastable() || fromHnd.GetMethodTable()->IsIDynamicInterfaceCastable())
+    // If casting from IDynamicInterfaceCastable, don't try to optimize
+    if (fromHnd.GetMethodTable()->IsIDynamicInterfaceCastable())
     {
         result = TypeCompareState::May;
     }

src/coreclr/vm/metasig.h

@@ -577,12 +577,6 @@ DEFINE_METASIG(IM(PtrVoid_RetVoid, P(v), v))
 DEFINE_METASIG_T(IM(PtrCopyConstructorCookie_RetVoid, P(g(COPY_CONSTRUCTOR_COOKIE)), v))
 #endif // defined(TARGET_X86) && defined(TARGET_WINDOWS)
 
-
-#ifdef FEATURE_ICASTABLE
-DEFINE_METASIG_T(SM(ICastable_RtType_RefException_RetBool, C(ICASTABLE) C(CLASS) r(C(EXCEPTION)), F))
-DEFINE_METASIG_T(SM(ICastable_RtType_RetRtType, C(ICASTABLE) C(CLASS), C(CLASS)))
-#endif // FEATURE_ICASTABLE
-
 DEFINE_METASIG_T(SM(IDynamicInterfaceCastable_RuntimeType_Bool_RetBool, C(IDYNAMICINTERFACECASTABLE) C(CLASS) F, F))
 DEFINE_METASIG_T(SM(IDynamicInterfaceCastable_RuntimeType_RetRtType, C(IDYNAMICINTERFACECASTABLE) C(CLASS), C(CLASS)))
 

src/coreclr/vm/method.cpp

@@ -3517,14 +3517,6 @@ BOOL MethodDesc::HasUnmanagedCallersOnlyAttribute()
         WellKnownAttribute::UnmanagedCallersOnly,
         nullptr,
         nullptr);
-    if (hr != S_OK)
-    {
-        // See https://github.com/dotnet/runtime/issues/37622
-        hr = GetCustomAttribute(
-            WellKnownAttribute::NativeCallableInternal,
-            nullptr,
-            nullptr);
-    }
 
     return (hr == S_OK) ? TRUE : FALSE;
 }

src/coreclr/vm/methodtable.cpp

@@ -375,24 +375,6 @@ void MethodTable::SetComObjectType()
     SetFlag(enum_flag_ComObject);
 }
 
-#ifdef FEATURE_ICASTABLE
-void MethodTable::SetICastable()
-{
-    LIMITED_METHOD_CONTRACT;
-    SetFlag(enum_flag_ICastable);
-}
-#endif
-
-BOOL MethodTable::IsICastable()
-{
-    LIMITED_METHOD_DAC_CONTRACT;
-#ifdef FEATURE_ICASTABLE
-    return GetFlag(enum_flag_ICastable);
-#else
-    return FALSE;
-#endif
-}
-
 void MethodTable::SetIDynamicInterfaceCastable()
 {
     LIMITED_METHOD_CONTRACT;
@@ -499,42 +481,6 @@ PTR_MethodTable InterfaceInfo_t::GetApproxMethodTable(Module * pContainingModule
     MethodTable *pServerMT = (*pServer)->GetMethodTable();
     PREFIX_ASSUME(pServerMT != NULL);
 
-#ifdef FEATURE_ICASTABLE
-    // In case of ICastable, instead of trying to find method implementation in the real object type
-    // we call GetMethodDescForInterfaceMethod() again with whatever type it returns.
-    // It allows objects that implement ICastable to mimic behavior of other types.
-    if (pServerMT->IsICastable() &&
-        !pItfMD->HasMethodInstantiation() &&
-        !TypeHandle(pServerMT).CanCastTo(ownerType)) // we need to make sure object doesn't implement this interface in a natural way
-    {
-        GCStress<cfg_any>::MaybeTrigger();
-
-        // Make call to ICastableHelpers.GetImplType(obj, interfaceTypeObj)
-        PREPARE_NONVIRTUAL_CALLSITE(METHOD__ICASTABLEHELPERS__GETIMPLTYPE);
-
-        OBJECTREF ownerManagedType = ownerType.GetManagedClassObject(); //GC triggers
-
-        DECLARE_ARGHOLDER_ARRAY(args, 2);
-        args[ARGNUM_0] = OBJECTREF_TO_ARGHOLDER(*pServer);
-        args[ARGNUM_1] = OBJECTREF_TO_ARGHOLDER(ownerManagedType);
-
-        OBJECTREF impTypeObj = NULL;
-        CALL_MANAGED_METHOD_RETREF(impTypeObj, OBJECTREF, args);
-
-        INDEBUG(ownerManagedType = NULL); //ownerManagedType wasn't protected during the call
-        if (impTypeObj == NULL) // GetImplType returns default(RuntimeTypeHandle)
-        {
-            COMPlusThrow(kEntryPointNotFoundException);
-        }
-
-        ReflectClassBaseObject* resultTypeObj = ((ReflectClassBaseObject*)OBJECTREFToObject(impTypeObj));
-        TypeHandle resultTypeHnd = resultTypeObj->GetType();
-        MethodTable *pResultMT = resultTypeHnd.GetMethodTable();
-
-        RETURN(pResultMT->GetMethodDescForInterfaceMethod(ownerType, pItfMD, TRUE /* throwOnConflict */));
-    }
-#endif
-
     // For IDynamicInterfaceCastable, instead of trying to find method implementation in the real object type
     // we call GetInterfaceImplementation on the object and call GetMethodDescForInterfaceMethod
     // with whatever type it returns.
@@ -1462,8 +1408,8 @@ BOOL MethodTable::CanCastTo(MethodTable* pTargetMT, TypeHandlePairList* pVisited
                                 CanCastToClass(pTargetMT, pVisited);
 
     // We only consider type-based conversion rules here.
-    // Therefore a negative result cannot rule out convertibility for ICastable, IDynamicInterfaceCastable, and COM objects
-    if (result || !(pTargetMT->IsInterface() && (this->IsComObjectType() || this->IsICastable() || this->IsIDynamicInterfaceCastable())))
+    // Therefore a negative result cannot rule out convertibility for IDynamicInterfaceCastable and COM objects
+    if (result || !(pTargetMT->IsInterface() && (this->IsComObjectType() || this->IsIDynamicInterfaceCastable())))
     {
         CastCache::TryAddToCache(this, pTargetMT, (BOOL)result);
     }

src/coreclr/vm/methodtable.h

@@ -1031,12 +1031,6 @@ class MethodTable
     // mark the class type as COM object class
     void SetComObjectType();
 
-#ifdef FEATURE_ICASTABLE
-    void SetICastable();
-#endif
-
-    BOOL IsICastable(); // This type implements ICastable interface
-
     void SetIDynamicInterfaceCastable();
     BOOL IsIDynamicInterfaceCastable();
 
@@ -3697,7 +3691,7 @@ public :
 
         enum_flag_HasFinalizer                = 0x00100000, // instances require finalization. GC depends on this bit.
         enum_flag_Collectible                 = 0x00200000, // GC depends on this bit.
-        enum_flag_ICastable                   = 0x00400000, // class implements ICastable interface
+        // enum_flag_unused                   = 0x00400000,
 
 #ifdef FEATURE_64BIT_ALIGNMENT
         enum_flag_RequiresAlign8              = 0x00800000, // Type requires 8-byte alignment (only set on platforms that require this and don't get it implicitly)
@@ -3717,7 +3711,6 @@ public :
         // Types that require non-trivial interface cast have this bit set in the category
         enum_flag_NonTrivialInterfaceCast   =  enum_flag_Category_Array
                                              | enum_flag_ComObject
-                                             | enum_flag_ICastable
                                              | enum_flag_IDynamicInterfaceCastable
                                              | enum_flag_Category_ValueType
 

src/coreclr/vm/methodtablebuilder.cpp

@@ -1998,13 +1998,6 @@ MethodTableBuilder::BuildMethodTableThrowing(
 
     if (!IsValueClass())
     {
-#ifdef FEATURE_ICASTABLE
-        if (g_pICastableInterface != NULL && pMT->CanCastToInterface(g_pICastableInterface))
-        {
-            pMT->SetICastable();
-        }
-#endif // FEATURE_ICASTABLE
-
         if (g_pIDynamicInterfaceCastableInterface != NULL && pMT->CanCastToInterface(g_pIDynamicInterfaceCastableInterface))
         {
             pMT->SetIDynamicInterfaceCastable();