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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#include "common.h"
#include "versionresilienthashcode.h"
#include "typehashingalgorithms.h"
bool GetVersionResilientTypeHashCode(IMDInternalImport *pMDImport, mdExportedType token, int * pdwHashCode)
{
CONTRACTL
{
NOTHROW;
GC_NOTRIGGER;
MODE_ANY;
PRECONDITION(CheckPointer(pdwHashCode));
}
CONTRACTL_END
_ASSERTE(TypeFromToken(token) == mdtTypeDef ||
TypeFromToken(token) == mdtTypeRef ||
TypeFromToken(token) == mdtExportedType);
_ASSERTE(!IsNilToken(token));
HRESULT hr;
LPCUTF8 szNamespace;
LPCUTF8 szName;
bool hasTypeToken = true;
int hashcode = 0;
while (hasTypeToken)
{
if (IsNilToken(token))
return false;
switch (TypeFromToken(token))
{
case mdtTypeDef:
if (FAILED(pMDImport->GetNameOfTypeDef(token, &szName, &szNamespace)))
return false;
hr = pMDImport->GetNestedClassProps(token, &token);
if (hr == CLDB_E_RECORD_NOTFOUND)
hasTypeToken = false;
else if (FAILED(hr))
return false;
break;
case mdtTypeRef:
if (FAILED(pMDImport->GetNameOfTypeRef(token, &szNamespace, &szName)))
return false;
if (FAILED(pMDImport->GetResolutionScopeOfTypeRef(token, &token)))
return false;
hasTypeToken = (TypeFromToken(token) == mdtTypeRef);
break;
case mdtExportedType:
if (FAILED(pMDImport->GetExportedTypeProps(token, &szNamespace, &szName, &token, NULL, NULL)))
return false;
hasTypeToken = (TypeFromToken(token) == mdtExportedType);
break;
default:
return false;
}
hashcode ^= ComputeNameHashCode(szNamespace, szName);
}
*pdwHashCode = hashcode;
return true;
}
#ifndef DACCESS_COMPILE
int GetVersionResilientTypeHashCode(TypeHandle type)
{
STANDARD_VM_CONTRACT;
if (!type.IsTypeDesc())
{
MethodTable *pMT = type.AsMethodTable();
_ASSERTE(!pMT->IsArray());
_ASSERTE(!IsNilToken(pMT->GetCl()));
LPCUTF8 szNamespace;
LPCUTF8 szName;
IfFailThrow(pMT->GetMDImport()->GetNameOfTypeDef(pMT->GetCl(), &szName, &szNamespace));
int hashcode = ComputeNameHashCode(szNamespace, szName);
MethodTable *pMTEnclosing = pMT->LoadEnclosingMethodTable(CLASS_LOAD_UNRESTOREDTYPEKEY);
if (pMTEnclosing != NULL)
{
hashcode = ComputeNestedTypeHashCode(GetVersionResilientTypeHashCode(TypeHandle(pMTEnclosing)), hashcode);
}
if (!pMT->IsGenericTypeDefinition() && pMT->HasInstantiation())
{
return ComputeGenericInstanceHashCode(hashcode,
pMT->GetInstantiation().GetNumArgs(), pMT->GetInstantiation(), GetVersionResilientTypeHashCode);
}
else
{
return hashcode;
}
}
else
if (type.IsArray())
{
ArrayTypeDesc *pArray = type.AsArray();
return ComputeArrayTypeHashCode(GetVersionResilientTypeHashCode(pArray->GetArrayElementTypeHandle()), pArray->GetRank());
}
else
if (type.IsPointer())
{
return ComputePointerTypeHashCode(GetVersionResilientTypeHashCode(type.AsTypeDesc()->GetTypeParam()));
}
else
if (type.IsByRef())
{
return ComputeByrefTypeHashCode(GetVersionResilientTypeHashCode(type.AsTypeDesc()->GetTypeParam()));
}
assert(false);
return 0;
}
int GetVersionResilientMethodHashCode(MethodDesc *pMD)
{
STANDARD_VM_CONTRACT;
int hashCode = GetVersionResilientTypeHashCode(TypeHandle(pMD->GetMethodTable()));
// Todo: Add signature to hash.
if (pMD->GetNumGenericMethodArgs() > 0)
{
hashCode ^= ComputeGenericInstanceHashCode(ComputeNameHashCode(pMD->GetName()), pMD->GetNumGenericMethodArgs(), pMD->GetMethodInstantiation(), GetVersionResilientTypeHashCode);
}
else
{
hashCode ^= ComputeNameHashCode(pMD->GetName());
}
return hashCode;
}
#endif // DACCESS_COMPILE
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