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class.cpp
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class.cpp
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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.
//
// File: CLASS.CPP
//
//
//
// ============================================================================
#include "common.h"
#include "dllimport.h"
#include "dllimportcallback.h"
#include "fieldmarshaler.h"
#include "constrainedexecutionregion.h"
#include "customattribute.h"
#include "encee.h"
#ifdef FEATURE_COMINTEROP
#include "comcallablewrapper.h"
#include "clrtocomcall.h"
#include "runtimecallablewrapper.h"
#endif // FEATURE_COMINTEROP
//#define DEBUG_LAYOUT
#define SORT_BY_RID
#ifndef DACCESS_COMPILE
#include "methodtablebuilder.h"
#endif
#include "nsenumhandleallcases.h"
#ifndef DACCESS_COMPILE
//*******************************************************************************
EEClass::EEClass(DWORD cbFixedEEClassFields)
{
LIMITED_METHOD_CONTRACT;
// Cache size of fixed fields (this instance also contains a set of packed fields whose final size isn't
// determined until the end of class loading). We store the size into a spare byte made available by
// compiler field alignment, so we need to ensure we never allocate a flavor of EEClass more than 255
// bytes long.
_ASSERTE(cbFixedEEClassFields <= 0xff);
m_cbFixedEEClassFields = (BYTE)cbFixedEEClassFields;
// All other members are initialized to zero
}
//*******************************************************************************
void *EEClass::operator new(
size_t size,
LoaderHeap *pHeap,
AllocMemTracker *pamTracker)
{
CONTRACTL
{
THROWS;
GC_NOTRIGGER;
INJECT_FAULT(COMPlusThrowOM());
}
CONTRACTL_END;
// EEClass (or sub-type) is always followed immediately by an EEClassPackedFields structure. This is
// maximally sized at runtime but in the ngen scenario will be optimized into a smaller structure (which
// is why it must go after all the fixed sized fields).
S_SIZE_T safeSize = S_SIZE_T(size) + S_SIZE_T(sizeof(EEClassPackedFields));
void *p = pamTracker->Track(pHeap->AllocMem(safeSize));
// No need to memset since this memory came from VirtualAlloc'ed memory
// memset (p, 0, size);
return p;
}
//*******************************************************************************
void EEClass::Destruct(MethodTable * pOwningMT)
{
CONTRACTL
{
NOTHROW;
GC_TRIGGERS;
FORBID_FAULT;
PRECONDITION(pOwningMT != NULL);
}
CONTRACTL_END
#ifndef CROSSGEN_COMPILE
// Not expected to be called for array EEClass
_ASSERTE(!pOwningMT->IsArray());
#ifdef _DEBUG
_ASSERTE(!IsDestroyed());
SetDestroyed();
#endif
#ifdef PROFILING_SUPPORTED
// If profiling, then notify the class is getting unloaded.
{
BEGIN_PIN_PROFILER(CORProfilerTrackClasses());
{
// Calls to the profiler callback may throw, or otherwise fail, if
// the profiler AVs/throws an unhandled exception/etc. We don't want
// those failures to affect the runtime, so we'll ignore them.
//
// Note that the profiler callback may turn around and make calls into
// the profiling runtime that may throw. This try/catch block doesn't
// protect the profiler against such failures. To protect the profiler
// against that, we will need try/catch blocks around all calls into the
// profiling API.
//
// (Bug #26467)
//
FAULT_NOT_FATAL();
EX_TRY
{
GCX_PREEMP();
g_profControlBlock.pProfInterface->ClassUnloadStarted((ClassID) pOwningMT);
}
EX_CATCH
{
// The exception here came from the profiler itself. We'll just
// swallow the exception, since we don't want the profiler to bring
// down the runtime.
}
EX_END_CATCH(RethrowTerminalExceptions);
}
END_PIN_PROFILER();
}
#endif // PROFILING_SUPPORTED
#ifdef FEATURE_COMINTEROP
// clean up any COM Data
if (m_pccwTemplate)
{
m_pccwTemplate->Release();
m_pccwTemplate = NULL;
}
#ifdef FEATURE_COMINTEROP_UNMANAGED_ACTIVATION
if (GetComClassFactory())
{
GetComClassFactory()->Cleanup();
}
#endif // FEATURE_COMINTEROP_UNMANAGED_ACTIVATION
#endif // FEATURE_COMINTEROP
if (IsDelegate())
{
DelegateEEClass* pDelegateEEClass = (DelegateEEClass*)this;
if (pDelegateEEClass->m_pStaticCallStub)
{
BOOL fStubDeleted = pDelegateEEClass->m_pStaticCallStub->DecRef();
if (fStubDeleted)
{
DelegateInvokeStubManager::g_pManager->RemoveStub(pDelegateEEClass->m_pStaticCallStub);
}
}
if (pDelegateEEClass->m_pInstRetBuffCallStub)
{
pDelegateEEClass->m_pInstRetBuffCallStub->DecRef();
}
// While m_pMultiCastInvokeStub is also a member,
// it is owned by the m_pMulticastStubCache, not by the class
// - it is shared across classes. So we don't decrement
// its ref count here
delete pDelegateEEClass->m_pUMThunkMarshInfo;
}
// We should never get here for thunking proxy because we do not destroy
// default appdomain and mscorlib.dll module during shutdown
_ASSERTE(!pOwningMT->IsTransparentProxy());
#if defined(FEATURE_REMOTING) && !defined(HAS_REMOTING_PRECODE)
// Destruct the method descs by walking the chunks.
MethodTable::IntroducedMethodIterator it(pOwningMT);
for (; it.IsValid(); it.Next())
{
MethodDesc * pMD = it.GetMethodDesc();
pMD->Destruct();
}
#endif
#ifdef FEATURE_COMINTEROP
if (GetSparseCOMInteropVTableMap() != NULL && !pOwningMT->IsZapped())
delete GetSparseCOMInteropVTableMap();
#endif // FEATURE_COMINTEROP
#ifdef PROFILING_SUPPORTED
// If profiling, then notify the class is getting unloaded.
{
BEGIN_PIN_PROFILER(CORProfilerTrackClasses());
{
// See comments in the call to ClassUnloadStarted for details on this
// FAULT_NOT_FATAL marker and exception swallowing.
FAULT_NOT_FATAL();
EX_TRY
{
GCX_PREEMP();
g_profControlBlock.pProfInterface->ClassUnloadFinished((ClassID) pOwningMT, S_OK);
}
EX_CATCH
{
}
EX_END_CATCH(RethrowTerminalExceptions);
}
END_PIN_PROFILER();
}
#endif // PROFILING_SUPPORTED
#endif // CROSSGEN_COMPILE
}
//*******************************************************************************
/*static*/ EEClass *
EEClass::CreateMinimalClass(LoaderHeap *pHeap, AllocMemTracker *pamTracker)
{
CONTRACTL
{
THROWS;
GC_NOTRIGGER;
}
CONTRACTL_END;
return new (pHeap, pamTracker) EEClass(sizeof(EEClass));
}
//*******************************************************************************
//-----------------------------------------------------------------------------------
// Note: this only loads the type to CLASS_DEPENDENCIES_LOADED as this can be called
// indirectly from DoFullyLoad() as part of accessibility checking.
//-----------------------------------------------------------------------------------
MethodTable *MethodTable::LoadEnclosingMethodTable(ClassLoadLevel targetLevel)
{
CONTRACTL
{
THROWS;
GC_TRIGGERS;
INJECT_FAULT(COMPlusThrowOM(););
MODE_ANY;
}
CONTRACTL_END
mdTypeDef tdEnclosing = GetEnclosingCl();
if (tdEnclosing == mdTypeDefNil)
{
return NULL;
}
return ClassLoader::LoadTypeDefThrowing(GetModule(),
tdEnclosing,
ClassLoader::ThrowIfNotFound,
ClassLoader::PermitUninstDefOrRef,
tdNoTypes,
targetLevel
).GetMethodTable();
}
#ifdef EnC_SUPPORTED
//*******************************************************************************
VOID EEClass::FixupFieldDescForEnC(MethodTable * pMT, EnCFieldDesc *pFD, mdFieldDef fieldDef)
{
CONTRACTL
{
THROWS;
MODE_COOPERATIVE;
WRAPPER(GC_TRIGGERS);
INJECT_FAULT(COMPlusThrowOM(););
}
CONTRACTL_END
Module * pModule = pMT->GetModule();
IMDInternalImport *pImport = pModule->GetMDImport();
#ifdef LOGGING
if (LoggingEnabled())
{
LPCSTR szFieldName;
if (FAILED(pImport->GetNameOfFieldDef(fieldDef, &szFieldName)))
{
szFieldName = "Invalid FieldDef record";
}
LOG((LF_ENC, LL_INFO100, "EEClass::InitializeFieldDescForEnC %s\n", szFieldName));
}
#endif //LOGGING
#ifdef _DEBUG
BOOL shouldBreak = CLRConfig::GetConfigValue(CLRConfig::INTERNAL_EncFixupFieldBreak);
if (shouldBreak > 0) {
_ASSERTE(!"EncFixupFieldBreak");
}
#endif // _DEBUG
// MethodTableBuilder uses the stacking allocator for most of it's
// working memory requirements, so this makes sure to free the memory
// once this function is out of scope.
CheckPointHolder cph(GetThread()->m_MarshalAlloc.GetCheckpoint());
MethodTableBuilder::bmtMetaDataInfo bmtMetaData;
bmtMetaData.cFields = 1;
bmtMetaData.pFields = (mdToken*)_alloca(sizeof(mdToken));
bmtMetaData.pFields[0] = fieldDef;
bmtMetaData.pFieldAttrs = (DWORD*)_alloca(sizeof(DWORD));
IfFailThrow(pImport->GetFieldDefProps(fieldDef, &bmtMetaData.pFieldAttrs[0]));
MethodTableBuilder::bmtMethAndFieldDescs bmtMFDescs;
// We need to alloc the memory, but don't have to fill it in. InitializeFieldDescs
// will copy pFD (1st arg) into here.
bmtMFDescs.ppFieldDescList = (FieldDesc**)_alloca(sizeof(FieldDesc*));
MethodTableBuilder::bmtFieldPlacement bmtFP;
// This simulates the environment that BuildMethodTableThrowing creates
// just enough to run InitializeFieldDescs
MethodTableBuilder::bmtErrorInfo bmtError;
bmtError.pModule = pModule;
bmtError.cl = pMT->GetCl();
bmtError.dMethodDefInError = mdTokenNil;
bmtError.szMethodNameForError = NULL;
MethodTableBuilder::bmtInternalInfo bmtInternal;
bmtInternal.pModule = pModule;
bmtInternal.pInternalImport = pImport;
bmtInternal.pParentMT = pMT->GetParentMethodTable();
MethodTableBuilder::bmtProperties bmtProp;
bmtProp.fIsValueClass = !!pMT->IsValueType();
MethodTableBuilder::bmtEnumFieldInfo bmtEnumFields(bmtInternal.pInternalImport);
if (pFD->IsStatic())
{
bmtEnumFields.dwNumStaticFields = 1;
}
else
{
bmtEnumFields.dwNumInstanceFields = 1;
}
// We shouldn't have to fill this in b/c we're not allowed to EnC value classes, or
// anything else with layout info associated with it.
LayoutRawFieldInfo *pLayoutRawFieldInfos = (LayoutRawFieldInfo*)_alloca((2) * sizeof(LayoutRawFieldInfo));
// If not NULL, it means there are some by-value fields, and this contains an entry for each instance or static field,
// which is NULL if not a by value field, and points to the EEClass of the field if a by value field. Instance fields
// come first, statics come second.
MethodTable **pByValueClassCache = NULL;
EEClass * pClass = pMT->GetClass();
// InitializeFieldDescs are going to change these numbers to something wrong,
// even though we already have the right numbers. Save & restore after.
WORD wNumInstanceFields = pMT->GetNumInstanceFields();
WORD wNumStaticFields = pMT->GetNumStaticFields();
unsigned totalDeclaredFieldSize = 0;
AllocMemTracker dummyAmTracker;
BaseDomain * pDomain = pMT->GetDomain();
MethodTableBuilder builder(pMT, pClass,
&GetThread()->m_MarshalAlloc,
&dummyAmTracker);
MethodTableBuilder::bmtGenericsInfo genericsInfo;
OBJECTREF pThrowable = NULL;
GCPROTECT_BEGIN(pThrowable);
builder.SetBMTData(pMT->GetLoaderAllocator(),
&bmtError,
&bmtProp,
NULL,
NULL,
NULL,
&bmtMetaData,
NULL,
&bmtMFDescs,
&bmtFP,
&bmtInternal,
NULL,
NULL,
&genericsInfo,
&bmtEnumFields,
NULL);
EX_TRY
{
GCX_PREEMP();
builder.InitializeFieldDescs(pFD,
pLayoutRawFieldInfos,
&bmtInternal,
&genericsInfo,
&bmtMetaData,
&bmtEnumFields,
&bmtError,
&pByValueClassCache,
&bmtMFDescs,
&bmtFP,
NULL, // not needed as thread or context static are not allowed in EnC
&totalDeclaredFieldSize);
}
EX_CATCH_THROWABLE(&pThrowable);
dummyAmTracker.SuppressRelease();
// Restore now
pClass->SetNumInstanceFields(wNumInstanceFields);
pClass->SetNumStaticFields(wNumStaticFields);
// PERF: For now, we turn off the fast equality check for valuetypes when a
// a field is modified by EnC. Consider doing a check and setting the bit only when
// necessary.
if (pMT->IsValueType())
{
pClass->SetIsNotTightlyPacked();
}
if (pThrowable != NULL)
{
COMPlusThrow(pThrowable);
}
GCPROTECT_END();
pFD->SetMethodTable(pMT);
// We set this when we first created the FieldDesc, but initializing the FieldDesc
// may have overwritten it so we need to set it again.
pFD->SetEnCNew();
return;
}
//---------------------------------------------------------------------------------------
//
// AddField - called when a new field is added by EnC
//
// Since instances of this class may already exist on the heap, we can't change the
// runtime layout of the object to accomodate the new field. Instead we hang the field
// off the syncblock (for instance fields) or in the FieldDesc for static fields.
//
// Here we just create the FieldDesc and link it to the class. The actual storage will
// be created lazily on demand.
//
HRESULT EEClass::AddField(MethodTable * pMT, mdFieldDef fieldDef, EnCFieldDesc **ppNewFD)
{
CONTRACTL
{
THROWS;
GC_NOTRIGGER;
MODE_COOPERATIVE;
}
CONTRACTL_END;
Module * pModule = pMT->GetModule();
IMDInternalImport *pImport = pModule->GetMDImport();
#ifdef LOGGING
if (LoggingEnabled())
{
LPCSTR szFieldName;
if (FAILED(pImport->GetNameOfFieldDef(fieldDef, &szFieldName)))
{
szFieldName = "Invalid FieldDef record";
}
LOG((LF_ENC, LL_INFO100, "EEClass::AddField %s\n", szFieldName));
}
#endif //LOGGING
// We can only add fields to normal classes
if (pMT->HasLayout() || pMT->IsValueType())
{
return CORDBG_E_ENC_CANT_ADD_FIELD_TO_VALUE_OR_LAYOUT_CLASS;
}
// We only add private fields.
// This may not be strictly necessary, but helps avoid any semantic confusion with
// existing code etc.
DWORD dwFieldAttrs;
IfFailThrow(pImport->GetFieldDefProps(fieldDef, &dwFieldAttrs));
LoaderAllocator* pAllocator = pMT->GetLoaderAllocator();
// Here we allocate a FieldDesc and set just enough info to be able to fix it up later
// when we're running in managed code.
EnCAddedFieldElement *pAddedField = (EnCAddedFieldElement *)
(void*)pAllocator->GetHighFrequencyHeap()->AllocMem_NoThrow(S_SIZE_T(sizeof(EnCAddedFieldElement)));
if (!pAddedField)
{
return E_OUTOFMEMORY;
}
pAddedField->Init( fieldDef, IsFdStatic(dwFieldAttrs) );
EnCFieldDesc *pNewFD = &pAddedField->m_fieldDesc;
// Get the EnCEEClassData for this class
// Don't adjust EEClass stats b/c EnC fields shouldn't touch EE data structures.
// We'll just update our private EnC structures instead.
EnCEEClassData *pEnCClass = ((EditAndContinueModule*)pModule)->GetEnCEEClassData(pMT);
if (! pEnCClass)
return E_FAIL;
// Add the field element to the list of added fields for this class
pEnCClass->AddField(pAddedField);
// Store the FieldDesc into the module's field list
{
CONTRACT_VIOLATION(ThrowsViolation); // B#25680 (Fix Enc violations): Must handle OOM's from Ensure
pModule->EnsureFieldDefCanBeStored(fieldDef);
}
pModule->EnsuredStoreFieldDef(fieldDef, pNewFD);
pNewFD->SetMethodTable(pMT);
// Success, return the new FieldDesc
if (ppNewFD)
{
*ppNewFD = pNewFD;
}
return S_OK;
}
//---------------------------------------------------------------------------------------
//
// AddMethod - called when a new method is added by EnC
//
// The method has already been added to the metadata with token methodDef.
// Create a new MethodDesc for the method.
//
HRESULT EEClass::AddMethod(MethodTable * pMT, mdMethodDef methodDef, RVA newRVA, MethodDesc **ppMethod)
{
CONTRACTL
{
THROWS;
GC_NOTRIGGER;
MODE_COOPERATIVE;
}
CONTRACTL_END;
Module * pModule = pMT->GetModule();
IMDInternalImport *pImport = pModule->GetMDImport();
#ifdef LOGGING
if (LoggingEnabled())
{
LPCSTR szMethodName;
if (FAILED(pImport->GetNameOfMethodDef(methodDef, &szMethodName)))
{
szMethodName = "Invalid MethodDef record";
}
LOG((LF_ENC, LL_INFO100, "EEClass::AddMethod %s\n", szMethodName));
}
#endif //LOGGING
DWORD dwDescrOffset;
DWORD dwImplFlags;
HRESULT hr = S_OK;
if (FAILED(pImport->GetMethodImplProps(methodDef, &dwDescrOffset, &dwImplFlags)))
{
return COR_E_BADIMAGEFORMAT;
}
DWORD dwMemberAttrs;
IfFailThrow(pImport->GetMethodDefProps(methodDef, &dwMemberAttrs));
// Refuse to add other special cases
if (IsReallyMdPinvokeImpl(dwMemberAttrs) ||
(pMT->IsInterface() && !IsMdStatic(dwMemberAttrs)) ||
IsMiRuntime(dwImplFlags))
{
_ASSERTE(! "**Error** EEClass::AddMethod only IL private non-virtual methods are supported");
LOG((LF_ENC, LL_INFO100, "**Error** EEClass::AddMethod only IL private non-virtual methods are supported\n"));
return CORDBG_E_ENC_EDIT_NOT_SUPPORTED;
}
#ifdef _DEBUG
// Validate that this methodDef correctly has a parent typeDef
mdTypeDef parentTypeDef;
if (FAILED(hr = pImport->GetParentToken(methodDef, &parentTypeDef)))
{
_ASSERTE(! "**Error** EEClass::AddMethod parent token not found");
LOG((LF_ENC, LL_INFO100, "**Error** EEClass::AddMethod parent token not found\n"));
return E_FAIL;
}
#endif // _DEBUG
EEClass * pClass = pMT->GetClass();
// @todo: OOM: InitMethodDesc will allocate loaderheap memory but leak it
// on failure. This AllocMemTracker should be replaced with a real one.
AllocMemTracker dummyAmTracker;
LoaderAllocator* pAllocator = pMT->GetLoaderAllocator();
// Create a new MethodDescChunk to hold the new MethodDesc
// Create the chunk somewhere we'll know is within range of the VTable
MethodDescChunk *pChunk = MethodDescChunk::CreateChunk(pAllocator->GetHighFrequencyHeap(),
1, // methodDescCount
mcInstantiated,
TRUE /* fNonVtableSlot */,
TRUE /* fNativeCodeSlot */,
FALSE /* fComPlusCallInfo */,
pMT,
&dummyAmTracker);
// Get the new MethodDesc (Note: The method desc memory is zero initialized)
MethodDesc *pNewMD = pChunk->GetFirstMethodDesc();
// Initialize the new MethodDesc
MethodTableBuilder builder(pMT,
pClass,
&GetThread()->m_MarshalAlloc,
&dummyAmTracker);
EX_TRY
{
INDEBUG(LPCSTR debug_szFieldName);
INDEBUG(if (FAILED(pImport->GetNameOfMethodDef(methodDef, &debug_szFieldName))) { debug_szFieldName = "Invalid MethodDef record"; });
builder.InitMethodDesc(pNewMD,
mcInstantiated, // Use instantiated methoddesc for EnC added methods to get space for slot
methodDef,
dwImplFlags,
dwMemberAttrs,
TRUE, // fEnC
newRVA,
pImport,
NULL
COMMA_INDEBUG(debug_szFieldName)
COMMA_INDEBUG(pMT->GetDebugClassName())
COMMA_INDEBUG(NULL)
);
pNewMD->SetTemporaryEntryPoint(pAllocator, &dummyAmTracker);
}
EX_CATCH_HRESULT(hr);
if (S_OK != hr)
return hr;
dummyAmTracker.SuppressRelease();
_ASSERTE(pNewMD->IsEnCAddedMethod());
pNewMD->SetSlot(MethodTable::NO_SLOT); // we can't ever use the slot for EnC methods
pClass->AddChunk(pChunk);
// Store the new MethodDesc into the collection for this class
pModule->EnsureMethodDefCanBeStored(methodDef);
pModule->EnsuredStoreMethodDef(methodDef, pNewMD);
LOG((LF_ENC, LL_INFO100, "EEClass::AddMethod new methoddesc %p for token %p\n", pNewMD, methodDef));
// Success - return the new MethodDesc
_ASSERTE( SUCCEEDED(hr) );
if (ppMethod)
{
*ppMethod = pNewMD;
}
return S_OK;
}
#endif // EnC_SUPPORTED
//---------------------------------------------------------------------------------------
//
// Check that the class type parameters are used consistently in this signature blob
// in accordance with their variance annotations
// The signature is assumed to be well-formed but indices and arities might not be correct
//
BOOL
EEClass::CheckVarianceInSig(
DWORD numGenericArgs,
BYTE * pVarianceInfo,
Module * pModule,
SigPointer psig,
CorGenericParamAttr position)
{
CONTRACTL
{
THROWS;
GC_TRIGGERS;
MODE_ANY;
}
CONTRACTL_END;
if (pVarianceInfo == NULL)
return TRUE;
CorElementType typ;
IfFailThrow(psig.GetElemType(&typ));
switch (typ)
{
case ELEMENT_TYPE_STRING:
case ELEMENT_TYPE_U:
case ELEMENT_TYPE_I:
case ELEMENT_TYPE_I1:
case ELEMENT_TYPE_U1:
case ELEMENT_TYPE_BOOLEAN:
case ELEMENT_TYPE_I2:
case ELEMENT_TYPE_U2:
case ELEMENT_TYPE_CHAR:
case ELEMENT_TYPE_I4:
case ELEMENT_TYPE_U4:
case ELEMENT_TYPE_I8:
case ELEMENT_TYPE_U8:
case ELEMENT_TYPE_R4:
case ELEMENT_TYPE_R8:
case ELEMENT_TYPE_VOID:
case ELEMENT_TYPE_OBJECT:
case ELEMENT_TYPE_TYPEDBYREF:
case ELEMENT_TYPE_MVAR:
case ELEMENT_TYPE_CLASS:
case ELEMENT_TYPE_VALUETYPE:
return TRUE;
case ELEMENT_TYPE_VAR:
{
DWORD index;
IfFailThrow(psig.GetData(&index));
// This will be checked later anyway; so give up and don't indicate a variance failure
if (index < 0 || index >= numGenericArgs)
return TRUE;
// Non-variant parameters are allowed to appear anywhere
if (pVarianceInfo[index] == gpNonVariant)
return TRUE;
// Covariant and contravariant parameters can *only* appear in resp. covariant and contravariant positions
return ((CorGenericParamAttr) (pVarianceInfo[index]) == position);
}
case ELEMENT_TYPE_GENERICINST:
{
IfFailThrow(psig.GetElemType(&typ));
mdTypeRef typeref;
IfFailThrow(psig.GetToken(&typeref));
// The number of type parameters follows
DWORD ntypars;
IfFailThrow(psig.GetData(&ntypars));
// If this is a value type, or position == gpNonVariant, then
// we're disallowing covariant and contravariant completely
if (typ == ELEMENT_TYPE_VALUETYPE || position == gpNonVariant)
{
for (unsigned i = 0; i < ntypars; i++)
{
if (!CheckVarianceInSig(numGenericArgs, pVarianceInfo, pModule, psig, gpNonVariant))
return FALSE;
IfFailThrow(psig.SkipExactlyOne());
}
}
// Otherwise we need to take notice of the variance annotation on each type parameter to the generic type
else
{
mdTypeDef typeDef;
Module * pDefModule;
// This will also be resolved later; so, give up and don't indicate a variance failure
if (!ClassLoader::ResolveTokenToTypeDefThrowing(pModule, typeref, &pDefModule, &typeDef))
return TRUE;
HENUMInternal hEnumGenericPars;
if (FAILED(pDefModule->GetMDImport()->EnumInit(mdtGenericParam, typeDef, &hEnumGenericPars)))
{
pDefModule->GetAssembly()->ThrowTypeLoadException(pDefModule->GetMDImport(), typeDef, IDS_CLASSLOAD_BADFORMAT);
}
for (unsigned i = 0; i < ntypars; i++)
{
mdGenericParam tkTyPar;
pDefModule->GetMDImport()->EnumNext(&hEnumGenericPars, &tkTyPar);
DWORD flags;
if (FAILED(pDefModule->GetMDImport()->GetGenericParamProps(tkTyPar, NULL, &flags, NULL, NULL, NULL)))
{
pDefModule->GetAssembly()->ThrowTypeLoadException(pDefModule->GetMDImport(), typeDef, IDS_CLASSLOAD_BADFORMAT);
}
CorGenericParamAttr genPosition = (CorGenericParamAttr) (flags & gpVarianceMask);
// If the surrounding context is contravariant then we need to flip the variance of this parameter
if (position == gpContravariant)
{
genPosition = genPosition == gpCovariant ? gpContravariant
: genPosition == gpContravariant ? gpCovariant
: gpNonVariant;
}
if (!CheckVarianceInSig(numGenericArgs, pVarianceInfo, pModule, psig, genPosition))
return FALSE;
IfFailThrow(psig.SkipExactlyOne());
}
pDefModule->GetMDImport()->EnumClose(&hEnumGenericPars);
}
return TRUE;
}
// Arrays behave covariantly
case ELEMENT_TYPE_ARRAY:
case ELEMENT_TYPE_SZARRAY:
return CheckVarianceInSig(numGenericArgs, pVarianceInfo, pModule, psig, position);
// Pointers behave non-variantly
case ELEMENT_TYPE_BYREF:
case ELEMENT_TYPE_PTR:
return CheckVarianceInSig(numGenericArgs, pVarianceInfo, pModule, psig, gpNonVariant);
case ELEMENT_TYPE_FNPTR:
{
// Calling convention
IfFailThrow(psig.GetData(NULL));
// Get arg count;
ULONG cArgs;
IfFailThrow(psig.GetData(&cArgs));
// Conservatively, assume non-variance of function pointer types
if (!CheckVarianceInSig(numGenericArgs, pVarianceInfo, pModule, psig, gpNonVariant))
return FALSE;
IfFailThrow(psig.SkipExactlyOne());
for (unsigned i = 0; i < cArgs; i++)
{
if (!CheckVarianceInSig(numGenericArgs, pVarianceInfo, pModule, psig, gpNonVariant))
return FALSE;
IfFailThrow(psig.SkipExactlyOne());
}
return TRUE;
}
default:
THROW_BAD_FORMAT(IDS_CLASSLOAD_BAD_VARIANCE_SIG, pModule);
}
return FALSE;
} // EEClass::CheckVarianceInSig
void
ClassLoader::LoadExactParentAndInterfacesTransitively(MethodTable *pMT)
{
CONTRACTL
{
STANDARD_VM_CHECK;
PRECONDITION(CheckPointer(pMT));
}
CONTRACTL_END;
TypeHandle thisTH(pMT);
SigTypeContext typeContext(thisTH);
IMDInternalImport* pInternalImport = pMT->GetMDImport();
MethodTable *pParentMT = pMT->GetParentMethodTable();
if (pParentMT != NULL && pParentMT->HasInstantiation())
{
// Fill in exact parent if it's instantiated
mdToken crExtends;
IfFailThrow(pInternalImport->GetTypeDefProps(
pMT->GetCl(),
NULL,
&crExtends));
_ASSERTE(!IsNilToken(crExtends));
_ASSERTE(TypeFromToken(crExtends) == mdtTypeSpec);
TypeHandle newParent = ClassLoader::LoadTypeDefOrRefOrSpecThrowing(pMT->GetModule(), crExtends, &typeContext,
ClassLoader::ThrowIfNotFound,
ClassLoader::FailIfUninstDefOrRef,
ClassLoader::LoadTypes,
CLASS_LOAD_EXACTPARENTS,
TRUE);
MethodTable* pNewParentMT = newParent.AsMethodTable();
if (pNewParentMT != pParentMT)
{
LOG((LF_CLASSLOADER, LL_INFO1000, "GENERICS: Replaced approximate parent %s with exact parent %s from token %x\n", pParentMT->GetDebugClassName(), pNewParentMT->GetDebugClassName(), crExtends));
// SetParentMethodTable is not used here since we want to update the indirection cell in the NGen case
*EnsureWritablePages(pMT->GetParentMethodTablePtr()) = pNewParentMT;
pParentMT = pNewParentMT;
}
}
if (pParentMT != NULL)
{
EnsureLoaded(pParentMT, CLASS_LOAD_EXACTPARENTS);
}
if (pParentMT != NULL && pParentMT->HasPerInstInfo())
{
// Copy down all inherited dictionary pointers which we
// could not embed.
DWORD nDicts = pParentMT->GetNumDicts();
for (DWORD iDict = 0; iDict < nDicts; iDict++)
{
if (pMT->GetPerInstInfo()[iDict] != pParentMT->GetPerInstInfo()[iDict])
*EnsureWritablePages(&pMT->GetPerInstInfo()[iDict]) = pParentMT->GetPerInstInfo()[iDict];
}
}
#ifdef FEATURE_PREJIT
// Restore action, not in MethodTable::Restore because we may have had approx parents at that point
if (pMT->IsZapped())
{
MethodTable::InterfaceMapIterator it = pMT->IterateInterfaceMap();
while (it.Next())
{
Module::RestoreMethodTablePointer(&it.GetInterfaceInfo()->m_pMethodTable, pMT->GetLoaderModule(), CLASS_LOAD_EXACTPARENTS);
}
}
else
#endif
{
MethodTableBuilder::LoadExactInterfaceMap(pMT);
}
#ifdef _DEBUG
if (g_pConfig->ShouldDumpOnClassLoad(pMT->GetDebugClassName()))
{
pMT->Debug_DumpInterfaceMap("Exact");
}
#endif //_DEBUG
} // ClassLoader::LoadExactParentAndInterfacesTransitively
// CLASS_LOAD_EXACTPARENTS phase of loading:
// * Load the base class at exact instantiation
// * Recurse LoadExactParents up parent hierarchy
// * Load explicitly declared interfaces on this class at exact instantiation
// * Fixup vtable
//
/*static*/
void ClassLoader::LoadExactParents(MethodTable *pMT)
{
CONTRACT_VOID
{
STANDARD_VM_CHECK;
PRECONDITION(CheckPointer(pMT));
POSTCONDITION(pMT->CheckLoadLevel(CLASS_LOAD_EXACTPARENTS));
}
CONTRACT_END;
MethodTable *pApproxParentMT = pMT->GetParentMethodTable();
if (!pMT->IsCanonicalMethodTable())
{
EnsureLoaded(TypeHandle(pMT->GetCanonicalMethodTable()), CLASS_LOAD_EXACTPARENTS);
}
LoadExactParentAndInterfacesTransitively(pMT);
MethodTableBuilder::CopyExactParentSlots(pMT, pApproxParentMT);
// We can now mark this type as having exact parents
pMT->SetHasExactParent();
RETURN;
}
//*******************************************************************************
// This is the routine that computes the internal type of a given type. It normalizes
// structs that have only one field (of int/ptr sized values), to be that underlying type.
//
// * see code:MethodTable#KindsOfElementTypes for more
// * It get used by code:TypeHandle::GetInternalCorElementType
CorElementType EEClass::ComputeInternalCorElementTypeForValueType(MethodTable * pMT)
{
CONTRACTL {
THROWS;
GC_TRIGGERS;
} CONTRACTL_END;
if (pMT->GetNumInstanceFields() == 1 && (!pMT->HasLayout()
|| pMT->GetNumInstanceFieldBytes() == 4
#ifdef _WIN64
|| pMT->GetNumInstanceFieldBytes() == 8
#endif // _WIN64