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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.
// StaticAllocationHelpers.inl -
//
//
// Helpers used to determine static offset allocation.
//
//
#ifndef StaticAllocationHelpers_INL
#define StaticAllocationHelpers_INL
// Will return underlying type if it's an enum
// ELEMENT_TYPE_VALUETYPE if it is a non enum
// ELEMENT_TYPE_END if it doesn't know (we may not want to load other assemblies)
static CorElementType ParseMetadataForStaticsIsValueTypeEnum(Module * pModule, IMDInternalImport *pImport, mdToken tk)
{
STANDARD_VM_CONTRACT;
if (TypeFromToken(tk) != mdtTypeDef)
{
// At this point, we would have to load other assemblies. The only one we have guaranteed
// to be there is mscorlib.
return ELEMENT_TYPE_END;
}
// The only condition we will be checking is that the parent of the type is System.Enum
// Rest of the checks will be handed by class loader, which will fail to load if it's malformed
// hence, no need to do all the checks here.
mdToken tkParent = 0;
DWORD dwParentAttr = 0;
if (FAILED(pImport->GetTypeDefProps(tk, &dwParentAttr, &tkParent)))
{
return ELEMENT_TYPE_END;
}
if (RidFromToken(tkParent) == 0)
{
return ELEMENT_TYPE_END;
}
LPCSTR szName = NULL;
LPCSTR szNamespace = NULL;
switch (TypeFromToken(tkParent))
{
case mdtTypeDef:
if (FAILED(pImport->GetNameOfTypeDef(tkParent, &szName, &szNamespace)))
{
return ELEMENT_TYPE_END;
}
break;
case mdtTypeRef:
if (FAILED(pImport->GetNameOfTypeRef(tkParent, &szNamespace, &szName)))
{
return ELEMENT_TYPE_END;
}
break;
default:
return ELEMENT_TYPE_END;
}
if (szName == NULL || szNamespace == NULL)
{
return ELEMENT_TYPE_END;
}
// If it doesn't inherit from System.Enum, then it must be a value type
// Note that loader will not load malformed types so this check is enough
if (strcmp(szName,"Enum") != 0 || strcmp(szNamespace,"System") != 0)
{
return ELEMENT_TYPE_VALUETYPE;
}
// OK, it's an enum; find its instance field and get its type
HENUMInternalHolder hEnum(pImport);
mdToken tkField;
hEnum.EnumInit(mdtFieldDef,tk);
while (pImport->EnumNext(&hEnum,&tkField))
{
PCCOR_SIGNATURE pMemberSignature;
DWORD cMemberSignature;
// Get the type of the static field.
DWORD dwMemberAttribs;
IfFailThrow(pImport->GetFieldDefProps(tkField, &dwMemberAttribs));
if (!IsFdStatic(dwMemberAttribs))
{
IfFailThrow(pImport->GetSigOfFieldDef(tkField, &cMemberSignature, &pMemberSignature));
IfFailThrow(validateTokenSig(tkField,pMemberSignature,cMemberSignature,dwMemberAttribs,pImport));
SigTypeContext typeContext;
MetaSig fsig(pMemberSignature, cMemberSignature, pModule, &typeContext, MetaSig::sigField);
CorElementType ElementType = fsig.NextArg();
return ElementType;
}
}
// no instance field found -- error!
return ELEMENT_TYPE_END;
}
static BOOL GetStaticFieldElementTypeForFieldDef(Module * pModule, IMDInternalImport *pImport, mdToken field, CorElementType *pElementType, mdToken *ptkValueTypeToken, int *pkk)
{
STANDARD_VM_CONTRACT;
PCCOR_SIGNATURE pMemberSignature;
DWORD cMemberSignature;
DWORD dwMemberAttribs;
IfFailThrow(pImport->GetFieldDefProps(field, &dwMemberAttribs));
// Skip non-static and literal fields
if (!IsFdStatic(dwMemberAttribs) || IsFdLiteral(dwMemberAttribs))
return TRUE;
// We need to do an extra check to see if this field is ThreadStatic
HRESULT hr = pImport->GetCustomAttributeByName((mdToken)field,
g_ThreadStaticAttributeClassName,
NULL, NULL);
IfFailThrow(hr);
// Use one set of variables for regular statics, and the other set for thread statics
*pkk = (hr == S_OK) ? 1 : 0;
// Get the type of the static field.
IfFailThrow(pImport->GetSigOfFieldDef(field, &cMemberSignature, &pMemberSignature));
IfFailThrow(validateTokenSig(field,pMemberSignature,cMemberSignature,dwMemberAttribs,pImport));
SigTypeContext typeContext; // <TODO> this is an empty type context: is this right? Should we be explicitly excluding all generic types from this iteration? </TODO>
MetaSig fsig(pMemberSignature, cMemberSignature, pModule, &typeContext, MetaSig::sigField);
CorElementType ElementType = fsig.NextArg();
if (ElementType == ELEMENT_TYPE_VALUETYPE)
{
// See if we can figure out what the value type is
Module *pTokenModule;
mdToken tk = fsig.GetArgProps().PeekValueTypeTokenClosed(pModule, &typeContext, &pTokenModule);
*ptkValueTypeToken = tk;
// As the current class is not generic, this should never happen, but if it did happen, we
// would have a problem.
if (pTokenModule != pModule)
{
ThrowHR(COR_E_BADIMAGEFORMAT, BFA_METADATA_CORRUPT);
}
ElementType = ParseMetadataForStaticsIsValueTypeEnum(pModule, pImport, tk);
}
*pElementType = ElementType;
return FALSE;
}
#endif // StaticAllocationHelpers_INL
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