Remove fragile NGen logic for precomputed hashcodes (#82563)

* Remove fragile NGen logic for precomputed hashcodes

Hashing was confirmed to offer minor performance wins
but not with lazy hash code generation. Pre hashing was needed
to have a benefit on start-up but even then it was minor.

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

@@ -994,9 +994,6 @@ internal static MdUtf8String GetUtf8Name(RuntimeMethodHandleInternal method)
             return new MdUtf8String(_GetUtf8Name(method));
         }
 
-        [MethodImpl(MethodImplOptions.InternalCall)]
-        internal static extern bool MatchesNameHash(RuntimeMethodHandleInternal method, uint hash);
-
         [DebuggerStepThrough]
         [DebuggerHidden]
         [MethodImpl(MethodImplOptions.InternalCall)]
@@ -1254,9 +1251,6 @@ public static RuntimeFieldHandle FromIntPtr(IntPtr value)
 
         internal static MdUtf8String GetUtf8Name(RuntimeFieldHandleInternal field) { return new MdUtf8String(_GetUtf8Name(field)); }
 
-        [MethodImpl(MethodImplOptions.InternalCall)]
-        internal static extern bool MatchesNameHash(RuntimeFieldHandleInternal handle, uint hash);
-
         [MethodImpl(MethodImplOptions.InternalCall)]
         internal static extern FieldAttributes GetAttributes(RuntimeFieldHandleInternal field);
 

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

@@ -154,18 +154,11 @@ internal enum CacheType
             {
                 private readonly MdUtf8String m_name;
                 private readonly MemberListType m_listType;
-                private readonly uint m_nameHash;
 
                 public unsafe Filter(byte* pUtf8Name, int cUtf8Name, MemberListType listType)
                 {
                     m_name = new MdUtf8String(pUtf8Name, cUtf8Name);
                     m_listType = listType;
-                    m_nameHash = 0;
-
-                    if (RequiresStringComparison())
-                    {
-                        m_nameHash = m_name.HashCaseInsensitive();
-                    }
                 }
 
                 public bool Match(MdUtf8String name)
@@ -186,7 +179,6 @@ public bool Match(MdUtf8String name)
 
                 // Does the current match type require a string comparison?
                 // If not, we know Match will always return true and the call can be skipped
-                // If so, we know we can have a valid hash to check against from GetHashToMatch
                 public bool RequiresStringComparison()
                 {
                     return (m_listType == MemberListType.CaseSensitive) ||
@@ -194,13 +186,6 @@ public bool RequiresStringComparison()
                 }
 
                 public bool CaseSensitive() => m_listType == MemberListType.CaseSensitive;
-
-                public uint GetHashToMatch()
-                {
-                    Debug.Assert(RequiresStringComparison());
-
-                    return m_nameHash;
-                }
             }
 
             private sealed class MemberInfoCache<T> where T : MemberInfo
@@ -622,12 +607,6 @@ private unsafe RuntimeMethodInfo[] PopulateMethods(Filter filter)
                         {
                             if (filter.RequiresStringComparison())
                             {
-                                if (!RuntimeMethodHandle.MatchesNameHash(methodHandle, filter.GetHashToMatch()))
-                                {
-                                    Debug.Assert(!filter.Match(RuntimeMethodHandle.GetUtf8Name(methodHandle)));
-                                    continue;
-                                }
-
                                 if (!filter.Match(RuntimeMethodHandle.GetUtf8Name(methodHandle)))
                                     continue;
                             }
@@ -684,12 +663,6 @@ private unsafe RuntimeMethodInfo[] PopulateMethods(Filter filter)
                             {
                                 if (filter.RequiresStringComparison())
                                 {
-                                    if (!RuntimeMethodHandle.MatchesNameHash(methodHandle, filter.GetHashToMatch()))
-                                    {
-                                        Debug.Assert(!filter.Match(RuntimeMethodHandle.GetUtf8Name(methodHandle)));
-                                        continue;
-                                    }
-
                                     if (!filter.Match(RuntimeMethodHandle.GetUtf8Name(methodHandle)))
                                         continue;
                                 }
@@ -793,12 +766,6 @@ private RuntimeConstructorInfo[] PopulateConstructors(Filter filter)
                     {
                         if (filter.RequiresStringComparison())
                         {
-                            if (!RuntimeMethodHandle.MatchesNameHash(methodHandle, filter.GetHashToMatch()))
-                            {
-                                Debug.Assert(!filter.Match(RuntimeMethodHandle.GetUtf8Name(methodHandle)));
-                                continue;
-                            }
-
                             if (!filter.Match(RuntimeMethodHandle.GetUtf8Name(methodHandle)))
                                 continue;
                         }
@@ -922,12 +889,6 @@ private unsafe void PopulateRtFields(Filter filter, RuntimeType declaringType, r
 
                         if (filter.RequiresStringComparison())
                         {
-                            if (!RuntimeFieldHandle.MatchesNameHash(runtimeFieldHandle, filter.GetHashToMatch()))
-                            {
-                                Debug.Assert(!filter.Match(RuntimeFieldHandle.GetUtf8Name(runtimeFieldHandle)));
-                                continue;
-                            }
-
                             if (!filter.Match(RuntimeFieldHandle.GetUtf8Name(runtimeFieldHandle)))
                                 continue;
                         }
@@ -4196,9 +4157,6 @@ private enum DispatchWrapperType : int
         [return: MarshalAs(UnmanagedType.Bool)]
         private static partial bool EqualsCaseInsensitive(void* szLhs, void* szRhs, int cSz);
 
-        [LibraryImport(RuntimeHelpers.QCall, EntryPoint = "MdUtf8String_HashCaseInsensitive")]
-        private static partial uint HashCaseInsensitive(void* sz, int cSz);
-
         private readonly byte* m_pStringHeap;        // This is the raw UTF8 string.
         private readonly int m_StringHeapByteLength;
 
@@ -4249,11 +4207,6 @@ internal bool EqualsCaseInsensitive(MdUtf8String s)
             }
         }
 
-        internal uint HashCaseInsensitive()
-        {
-            return HashCaseInsensitive(m_pStringHeap, m_StringHeapByteLength);
-        }
-
         public override string ToString()
             => Encoding.UTF8.GetString(new ReadOnlySpan<byte>(m_pStringHeap, m_StringHeapByteLength));
     }

src/coreclr/vm/ecalllist.h

@@ -223,7 +223,6 @@ FCFuncStart(gRuntimeMethodHandle)
     FCFuncElement("GetMethodDef", RuntimeMethodHandle::GetMethodDef)
     FCFuncElement("GetName", RuntimeMethodHandle::GetName)
     FCFuncElement("_GetUtf8Name", RuntimeMethodHandle::GetUtf8Name)
-    FCFuncElement("MatchesNameHash", RuntimeMethodHandle::MatchesNameHash)
     FCFuncElement("HasMethodInstantiation", RuntimeMethodHandle::HasMethodInstantiation)
     FCFuncElement("IsGenericMethodDefinition", RuntimeMethodHandle::IsGenericMethodDefinition)
     FCFuncElement("GetGenericParameterCount", RuntimeMethodHandle::GetGenericParameterCount)
@@ -244,7 +243,6 @@ FCFuncStart(gCOMFieldHandleNewFuncs)
     FCFuncElement("SetValueDirect", RuntimeFieldHandle::SetValueDirect)
     FCFuncElement("GetName", RuntimeFieldHandle::GetName)
     FCFuncElement("_GetUtf8Name", RuntimeFieldHandle::GetUtf8Name)
-    FCFuncElement("MatchesNameHash", RuntimeFieldHandle::MatchesNameHash)
     FCFuncElement("GetAttributes", RuntimeFieldHandle::GetAttributes)
     FCFuncElement("GetApproxDeclaringType", RuntimeFieldHandle::GetApproxDeclaringType)
     FCFuncElement("GetToken", RuntimeFieldHandle::GetToken)

src/coreclr/vm/field.cpp

@@ -69,7 +69,6 @@ VOID FieldDesc::Init(mdFieldDef mb, CorElementType FieldType, DWORD dwMemberAttr
     _ASSERTE(fIsStatic || (!fIsRVA && !fIsThreadLocal));
     _ASSERTE(fIsRVA + fIsThreadLocal <= 1);
 
-    m_requiresFullMbValue = 0;
     SetMemberDef(mb);
 
     // A TypedByRef should be treated like a regular value type.
@@ -105,30 +104,6 @@ BOOL FieldDesc::IsByRef()
     return CorTypeInfo::IsByRef_NoThrow(GetFieldType());
 }
 
-BOOL FieldDesc::MightHaveName(ULONG nameHashValue)
-{
-    LIMITED_METHOD_CONTRACT;
-
-    // We only have space for a name hash when we are using the packed mb layout
-    if (m_requiresFullMbValue)
-    {
-        return TRUE;
-    }
-
-    ULONG thisHashValue = m_mb & enum_packedMbLayout_NameHashMask;
-
-    // A zero value might mean no hash has ever been set
-    // (checking this way is better than dedicating a bit to tell us)
-    if (thisHashValue == 0)
-    {
-        return TRUE;
-    }
-
-    ULONG testHashValue = nameHashValue & enum_packedMbLayout_NameHashMask;
-
-    return (thisHashValue == testHashValue);
-}
-
 #ifndef DACCESS_COMPILE //we don't require DAC to special case simple types
 // Return the type of the field, as a class, but only if it's loaded.
 TypeHandle FieldDesc::LookupFieldTypeHandle(ClassLoadLevel level, BOOL dropGenericArgumentLevel)

src/coreclr/vm/field.h

@@ -45,8 +45,6 @@ class FieldDesc
         unsigned m_dword1;
         struct {
 #endif
-        // Note that we may store other information in the high bits if available --
-        // see enum_packedMBLayout and m_requiresFullMbValue for details.
         unsigned m_mb               : 24;
 
         // 8 bits...
@@ -54,8 +52,6 @@ class FieldDesc
         unsigned m_isThreadLocal    : 1;
         unsigned m_isRVA            : 1;
         unsigned m_prot             : 3;
-        // Does this field's mb require all 24 bits
-        unsigned m_requiresFullMbValue : 1;
 #if defined(DACCESS_COMPILE)
         };
     };
@@ -93,7 +89,6 @@ public:
         m_isThreadLocal = sourceField.m_isThreadLocal;
         m_isRVA = sourceField.m_isRVA;
         m_prot = sourceField.m_prot;
-        m_requiresFullMbValue = sourceField.m_requiresFullMbValue;
 
         m_dwOffset = sourceField.m_dwOffset;
         m_type = sourceField.m_type;
@@ -131,43 +126,15 @@ public:
               BOOL fIsThreadLocal,
               LPCSTR pszFieldName);
 
-    enum {
-        enum_packedMbLayout_MbMask        = 0x01FFFF,
-        enum_packedMbLayout_NameHashMask  = 0xFE0000
-    };
-
     void SetMemberDef(mdFieldDef mb)
     {
         WRAPPER_NO_CONTRACT;
-
-        // Check if we have to avoid using the packed mb layout
-        if (RidFromToken(mb) > enum_packedMbLayout_MbMask)
-        {
-            m_requiresFullMbValue = 1;
-        }
-
-        // Set only the portion of m_mb we are using
-        if (!m_requiresFullMbValue)
-        {
-            m_mb &= ~enum_packedMbLayout_MbMask;
-            m_mb |= RidFromToken(mb);
-        }
-        else
-        {
-            m_mb = RidFromToken(mb);
-        }
+        m_mb = RidFromToken(mb);
     }
 
     mdFieldDef GetMemberDef() const
     {
         LIMITED_METHOD_DAC_CONTRACT;
-
-        // Check if this FieldDesc is using the packed mb layout
-        if (!m_requiresFullMbValue)
-        {
-            return TokenFromRid(m_mb & enum_packedMbLayout_MbMask, mdtFieldDef);
-        }
-
         return TokenFromRid(m_mb, mdtFieldDef);
     }
 
@@ -652,8 +619,6 @@ public:
         return GetMDImport()->GetNameOfFieldDef(GetMemberDef(), pszName);
     }
 
-    BOOL MightHaveName(ULONG nameHashValue);
-
     // <TODO>@TODO: </TODO>This is slow, don't use it!
     DWORD   GetAttributes()
     {

src/coreclr/vm/memberload.cpp

@@ -1096,9 +1096,6 @@ MemberLoader::FindMethod(
     // Retrieve the right comparison function to use.
     UTF8StringCompareFuncPtr StrCompFunc = FM_GetStrCompFunc(flags);
 
-    SString targetName(SString::Utf8Literal, pszName);
-    ULONG targetNameHash = targetName.HashCaseInsensitive();
-
     // Statistically it's most likely for a method to be found in non-vtable portion of this class's members, then in the
     // vtable of this class's declared members, then in the inherited portion of the vtable, so we search backwards.
 
@@ -1129,11 +1126,7 @@ MemberLoader::FindMethod(
         }
 
         if ((flags & FM_IgnoreName) != 0
-            ||
-            (pCurDeclMD->MightHaveName(targetNameHash)
-            // This is done last since it is the most expensive of the IF statement.
-            && StrCompFunc(pszName, pCurDeclMD->GetNameThrowing()) == 0)
-           )
+            || StrCompFunc(pszName, pCurDeclMD->GetNameThrowing()) == 0)
         {
             if (CompareMethodSigWithCorrectSubstitution(pSignature, cSignature, pModule, pCurDeclMD, pDefSubst, pMT))
             {
@@ -1265,9 +1258,6 @@ MemberLoader::FindMethodByName(MethodTable * pMT, LPCUTF8 pszName, FM_Flags flag
     // Retrieve the right comparison function to use.
     UTF8StringCompareFuncPtr StrCompFunc = FM_GetStrCompFunc(flags);
 
-    SString targetName(SString::Utf8, pszName);
-    ULONG targetNameHash = targetName.HashCaseInsensitive();
-
     // Scan all classes in the hierarchy, starting at the current class and
     // moving back up towards the base.
     while (pMT != NULL)
@@ -1296,7 +1286,7 @@ MemberLoader::FindMethodByName(MethodTable * pMT, LPCUTF8 pszName, FM_Flags flag
                     continue;
                 }
 
-                if (pCurMD->MightHaveName(targetNameHash) && StrCompFunc(pszName, pCurMD->GetNameOnNonArrayClass()) == 0)
+                if (StrCompFunc(pszName, pCurMD->GetNameOnNonArrayClass()) == 0)
                 {
                     if (pRetMD != NULL)
                     {
@@ -1494,9 +1484,6 @@ MemberLoader::FindField(MethodTable * pMT, LPCUTF8 pszName, PCCOR_SIGNATURE pSig
     if (pMT->IsArray())
         return NULL;
 
-    SString targetName(SString::Utf8Literal, pszName);
-    ULONG targetNameHash = targetName.HashCaseInsensitive();
-
     EEClass * pClass = pMT->GetClass();
     MethodTable *pParentMT = pMT->GetParentMethodTable();
 
@@ -1518,11 +1505,6 @@ MemberLoader::FindField(MethodTable * pMT, LPCUTF8 pszName, PCCOR_SIGNATURE pSig
         // Check is valid FieldDesc, and not some random memory
         INDEBUGIMPL(pFD->GetApproxEnclosingMethodTable()->SanityCheck());
 
-        if (!pFD->MightHaveName(targetNameHash))
-        {
-            continue;
-        }
-
         IfFailThrow(pInternalImport->GetNameOfFieldDef(mdField, &szMemberName));
 
         if (StrCompFunc(szMemberName, pszName) != 0)

src/coreclr/vm/method.cpp

@@ -383,31 +383,6 @@ VOID MethodDesc::GetFullMethodInfo(SString& fullMethodSigName)
 
 #endif
 
-//*******************************************************************************
-BOOL MethodDesc::MightHaveName(ULONG nameHashValue)
-{
-    LIMITED_METHOD_CONTRACT;
-
-    // We only have space for a name hash when we are using the packed slot layout
-    if (RequiresFullSlotNumber())
-    {
-        return TRUE;
-    }
-
-    WORD thisHashValue = m_wSlotNumber & enum_packedSlotLayout_NameHashMask;
-
-    // A zero value might mean no hash has ever been set
-    // (checking this way is better than dedicating a bit to tell us)
-    if (thisHashValue == 0)
-    {
-        return TRUE;
-    }
-
-    WORD testHashValue = (WORD) nameHashValue & enum_packedSlotLayout_NameHashMask;
-
-    return (thisHashValue == testHashValue);
-}
-
 //*******************************************************************************
 void MethodDesc::GetSig(PCCOR_SIGNATURE *ppSig, DWORD *pcSig)
 {

src/coreclr/vm/method.hpp

@@ -164,8 +164,7 @@ enum MethodDescClassification
     // Is the method synchronized
     mdcSynchronized                     = 0x4000,
 
-    // Does the method's slot number require all 16 bits
-    mdcRequiresFullSlotNumber           = 0x8000
+    // unused                           = 0x8000
 };
 
 #define METHOD_MAX_RVA                          0x7FFFFFFF
@@ -322,8 +321,6 @@ public:
 
     LPCUTF8 GetNameThrowing();
 
-    BOOL MightHaveName(ULONG nameHashValue);
-
     FORCEINLINE LPCUTF8 GetNameOnNonArrayClass()
     {
         WRAPPER_NO_CONTRACT;
@@ -1028,36 +1025,13 @@ public:
     inline WORD GetSlot()
     {
         LIMITED_METHOD_DAC_CONTRACT;
-
-        // Check if this MD is using the packed slot layout
-        if (!RequiresFullSlotNumber())
-        {
-            return (m_wSlotNumber & enum_packedSlotLayout_SlotMask);
-        }
-
         return m_wSlotNumber;
     }
 
     inline VOID SetSlot(WORD wSlotNum)
     {
         LIMITED_METHOD_CONTRACT;
-
-        // Check if we have to avoid using the packed slot layout
-        if (wSlotNum > enum_packedSlotLayout_SlotMask)
-        {
-            SetRequiresFullSlotNumber();
-        }
-
-        // Set only the portion of m_wSlotNumber we are using
-        if (!RequiresFullSlotNumber())
-        {
-            m_wSlotNumber &= ~enum_packedSlotLayout_SlotMask;
-            m_wSlotNumber |= wSlotNum;
-        }
-        else
-        {
-            m_wSlotNumber = wSlotNum;
-        }
+        m_wSlotNumber = wSlotNum;
     }
 
     inline BOOL IsVirtualSlot()
@@ -1073,19 +1047,6 @@ public:
 
     PTR_MethodDesc GetDeclMethodDesc(UINT32 slotNumber);
 
-protected:
-    inline void SetRequiresFullSlotNumber()
-    {
-        LIMITED_METHOD_CONTRACT;
-        m_wFlags |= mdcRequiresFullSlotNumber;
-    }
-
-    inline DWORD RequiresFullSlotNumber()
-    {
-        LIMITED_METHOD_DAC_CONTRACT;
-        return (m_wFlags & mdcRequiresFullSlotNumber) != 0;
-    }
-
 public:
     mdMethodDef GetMemberDef() const;
     mdMethodDef GetMemberDef_NoLogging() const;
@@ -1687,19 +1648,9 @@ protected:
     BYTE        m_bFlags2;
 
     // The slot number of this MethodDesc in the vtable array.
-    // Note that we may store other information in the high bits if available --
-    // see enum_packedSlotLayout and mdcRequiresFullSlotNumber for details.
     WORD m_wSlotNumber;
-
-    enum {
-        enum_packedSlotLayout_SlotMask      = 0x03FF,
-        enum_packedSlotLayout_NameHashMask  = 0xFC00
-    };
-
     WORD m_wFlags;
 
-
-
 public:
 #ifdef DACCESS_COMPILE
     void EnumMemoryRegions(CLRDataEnumMemoryFlags flags);

src/coreclr/vm/qcallentrypoints.cpp

@@ -151,7 +151,6 @@ static const Entry s_QCall[] =
     DllImportEntry(TypeBuilder_SetConstantValue)
     DllImportEntry(TypeBuilder_DefineCustomAttribute)
     DllImportEntry(MdUtf8String_EqualsCaseInsensitive)
-    DllImportEntry(MdUtf8String_HashCaseInsensitive)
     DllImportEntry(TypeName_ReleaseTypeNameParser)
     DllImportEntry(TypeName_CreateTypeNameParser)
     DllImportEntry(TypeName_GetNames)

src/coreclr/vm/runtimehandles.cpp

@@ -59,25 +59,6 @@ extern "C" BOOL QCALLTYPE MdUtf8String_EqualsCaseInsensitive(LPCUTF8 szLhs, LPCU
     return fStringsEqual;
 }
 
-extern "C" ULONG QCALLTYPE MdUtf8String_HashCaseInsensitive(LPCUTF8 sz, INT32 stringNumBytes)
-{
-    QCALL_CONTRACT;
-
-    // Important: the string in pSsz isn't null terminated so the length must be used
-    // when performing operations on the string.
-
-    ULONG hashValue = 0;
-
-    BEGIN_QCALL;
-
-    StackSString str(SString::Utf8, sz, stringNumBytes);
-    hashValue = str.HashCaseInsensitive();
-
-    END_QCALL;
-
-    return hashValue;
-}
-
 static BOOL CheckCAVisibilityFromDecoratedType(MethodTable* pCAMT, MethodDesc* pCACtor, MethodTable* pDecoratedMT, Module* pDecoratedModule)
 {
     CONTRACTL
@@ -896,7 +877,7 @@ FCIMPL1(Object *, RuntimeTypeHandle::GetArgumentTypesFromFunctionPointer, Reflec
         FCThrowRes(kArgumentException, W("Arg_InvalidHandle"));
 
     FnPtrTypeDesc* fnPtr = typeHandle.AsFnPtrType();
-    
+
     HELPER_METHOD_FRAME_BEGIN_RET_PROTECT(gc);
     {
         MethodTable *pMT = CoreLibBinder::GetClass(CLASS__TYPE);
@@ -908,7 +889,7 @@ FCIMPL1(Object *, RuntimeTypeHandle::GetArgumentTypesFromFunctionPointer, Reflec
         {
             TypeHandle typeHandle = fnPtr->GetRetAndArgTypes()[position];
             OBJECTREF refType = typeHandle.GetManagedClassObject();
-            gc.retVal->SetAt(position, refType);                
+            gc.retVal->SetAt(position, refType);
         }
     }
     HELPER_METHOD_FRAME_END();
@@ -933,7 +914,7 @@ FCIMPL1(FC_BOOL_RET, RuntimeTypeHandle::IsUnmanagedFunctionPointer, ReflectClass
         FnPtrTypeDesc* fnPtr = typeHandle.AsFnPtrType();
         unmanaged = (fnPtr->GetCallConv() & IMAGE_CEE_CS_CALLCONV_MASK) == IMAGE_CEE_CS_CALLCONV_UNMANAGED;
     }
-    
+
     FC_RETURN_BOOL(unmanaged);
 }
 FCIMPLEND
@@ -1722,14 +1703,6 @@ FCIMPL1(LPCUTF8, RuntimeMethodHandle::GetUtf8Name, MethodDesc *pMethod) {
 }
 FCIMPLEND
 
-FCIMPL2(FC_BOOL_RET, RuntimeMethodHandle::MatchesNameHash, MethodDesc * pMethod, ULONG hash)
-{
-    FCALL_CONTRACT;
-
-    FC_RETURN_BOOL(pMethod->MightHaveName(hash));
-}
-FCIMPLEND
-
 FCIMPL1(StringObject*, RuntimeMethodHandle::GetName, MethodDesc *pMethod) {
     CONTRACTL {
         FCALL_CHECK;
@@ -2159,7 +2132,7 @@ FCIMPL6(void, SignatureNative::GetSignature,
                 pMethod, declType.GetClassOrArrayInstantiation(), pMethod->LoadMethodInstantiation(), &typeContext);
         else
             SigTypeContext::InitTypeContext(declType, &typeContext);
-        
+
         MetaSig msig(pCorSig, cCorSig, pModule, &typeContext,
             (callConv & IMAGE_CEE_CS_CALLCONV_MASK) == IMAGE_CEE_CS_CALLCONV_FIELD ? MetaSig::sigField : MetaSig::sigMember);
 
@@ -2734,14 +2707,6 @@ FCIMPL1(LPCUTF8, RuntimeFieldHandle::GetUtf8Name, FieldDesc *pField) {
 }
 FCIMPLEND
 
-FCIMPL2(FC_BOOL_RET, RuntimeFieldHandle::MatchesNameHash, FieldDesc * pField, ULONG hash)
-{
-    FCALL_CONTRACT;
-
-    FC_RETURN_BOOL(pField->MightHaveName(hash));
-}
-FCIMPLEND
-
 FCIMPL1(INT32, RuntimeFieldHandle::GetAttributes, FieldDesc *pField) {
     CONTRACTL {
         FCALL_CHECK;

src/coreclr/vm/runtimehandles.h

@@ -103,8 +103,6 @@ public:
 
 extern "C" BOOL QCALLTYPE MdUtf8String_EqualsCaseInsensitive(LPCUTF8 szLhs, LPCUTF8 szRhs, INT32 stringNumBytes);
 
-extern "C" ULONG QCALLTYPE MdUtf8String_HashCaseInsensitive(LPCUTF8 sz, INT32 stringNumBytes);
-
 class RuntimeTypeHandle;
 
 typedef RuntimeTypeHandle FCALLRuntimeTypeHandle;
@@ -138,7 +136,7 @@ public:
 
     static FCDECL1(Object *, GetArgumentTypesFromFunctionPointer, ReflectClassBaseObject *pTypeUNSAFE);
     static FCDECL1(FC_BOOL_RET, IsUnmanagedFunctionPointer, ReflectClassBaseObject *pTypeUNSAFE);
-    
+
     static FCDECL2(FC_BOOL_RET, CanCastTo, ReflectClassBaseObject *pType, ReflectClassBaseObject *pTarget);
     static FCDECL2(FC_BOOL_RET, IsInstanceOfType, ReflectClassBaseObject *pType, Object *object);
 
@@ -255,7 +253,6 @@ public:
     static FCDECL1(INT32, GetMethodDef, ReflectMethodObject *pMethodUNSAFE);
     static FCDECL1(StringObject*, GetName, MethodDesc *pMethod);
     static FCDECL1(LPCUTF8, GetUtf8Name, MethodDesc *pMethod);
-    static FCDECL2(FC_BOOL_RET, MatchesNameHash, MethodDesc * pMethod, ULONG hash);
     static
     FCDECL1(FC_BOOL_RET, HasMethodInstantiation, MethodDesc *pMethod);
 
@@ -309,7 +306,6 @@ public:
     static FCDECL5(void, SetValueDirect, ReflectFieldObject *pFieldUNSAFE, ReflectClassBaseObject *pFieldType, TypedByRef *pTarget, Object *valueUNSAFE, ReflectClassBaseObject *pContextType);
     static FCDECL1(StringObject*, GetName, ReflectFieldObject *pFieldUNSAFE);
     static FCDECL1(LPCUTF8, GetUtf8Name, FieldDesc *pField);
-    static FCDECL2(FC_BOOL_RET, MatchesNameHash, FieldDesc * pField, ULONG hash);
 
     static FCDECL1(INT32, GetAttributes, FieldDesc *pField);
     static FCDECL1(ReflectClassBaseObject*, GetApproxDeclaringType, FieldDesc *pField);