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classcompat.cpp
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classcompat.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: CLASSCOMPAT.CPP
// ===========================================================================
// This file contains backward compatibility functionality for COM Interop.
// ===========================================================================
//
#include "common.h"
#ifndef DACCESS_COMPILE
#include "clsload.hpp"
#include "method.hpp"
#include "class.h"
#include "classcompat.h"
#include "object.h"
#include "field.h"
#include "util.hpp"
#include "excep.h"
#include "threads.h"
#include "stublink.h"
#include "dllimport.h"
#include "verifier.hpp"
#include "jitinterface.h"
#include "eeconfig.h"
#include "log.h"
#include "fieldmarshaler.h"
#include "cgensys.h"
#include "gcheaputilities.h"
#include "security.h"
#include "dbginterface.h"
#include "comdelegate.h"
#include "sigformat.h"
#ifdef FEATURE_REMOTING
#include "remoting.h"
#endif
#include "eeprofinterfaces.h"
#include "dllimportcallback.h"
#include "listlock.h"
#include "methodimpl.h"
#include "guidfromname.h"
#include "stackprobe.h"
#include "encee.h"
#include "encee.h"
#include "comsynchronizable.h"
#include "customattribute.h"
#include "virtualcallstub.h"
#include "eeconfig.h"
#include "contractimpl.h"
#include "prettyprintsig.h"
#include "comcallablewrapper.h"
#include "clrtocomcall.h"
#include "runtimecallablewrapper.h"
#include "listlock.inl"
#include "generics.h"
#include "contractimpl.h"
//////////////////////////////////////////////////////////////////////////////////////////////
ClassCompat::InterfaceInfo_t* InteropMethodTableData::FindInterface(MethodTable *pInterface)
{
WRAPPER_NO_CONTRACT;
for (DWORD i = 0; i < cInterfaceMap; i++)
{
ClassCompat::InterfaceInfo_t *iMap = &pInterfaceMap[i];
if (iMap->m_pMethodTable->IsEquivalentTo(pInterface))
{
// Extensible RCW's need to be handled specially because they can have interfaces
// in their map that are added at runtime. These interfaces will have a start offset
// of -1 to indicate this. We cannot take for granted that every instance of this
// COM object has this interface so FindInterface on these interfaces is made to fail.
//
// However, we are only considering the statically available slots here
// (m_wNumInterface doesn't contain the dynamic slots), so we can safely
// ignore this detail.
return iMap;
}
}
return NULL;
}
//////////////////////////////////////////////////////////////////////////////////////////////
// get start slot for interface
// returns -1 if interface not found
WORD InteropMethodTableData::GetStartSlotForInterface(MethodTable* pInterface)
{
WRAPPER_NO_CONTRACT;
ClassCompat::InterfaceInfo_t* pInfo = FindInterface(pInterface);
if (pInfo != NULL)
{
WORD startSlot = pInfo->GetInteropStartSlot();
_ASSERTE(startSlot != MethodTable::NO_SLOT);
return startSlot;
}
return MethodTable::NO_SLOT;
}
//////////////////////////////////////////////////////////////////////////////////////////////
// This will return the interop slot for pMD in pMT. It will traverse the inheritance tree
// to find a match.
/*static*/ WORD InteropMethodTableData::GetSlotForMethodDesc(MethodTable *pMT, MethodDesc *pMD)
{
while (pMT)
{
InteropMethodTableData *pData = pMT->LookupComInteropData();
_ASSERTE(pData);
for (DWORD i = 0; i < pData->cVTable; i++)
{
if (pData->pVTable[i].pMD == pMD)
return (WORD) i;
}
pMT = pMT->GetParentMethodTable();
}
return MethodTable::NO_SLOT;
}
//////////////////////////////////////////////////////////////////////////////////////////////
InteropMethodTableSlotDataMap::InteropMethodTableSlotDataMap(InteropMethodTableSlotData *pSlotData, DWORD cSlotData)
{
m_pSlotData = pSlotData;
m_cSlotData = cSlotData;
m_iCurSlot = 0;
}
//////////////////////////////////////////////////////////////////////////////////////////////
InteropMethodTableSlotData *InteropMethodTableSlotDataMap::Exists_Helper(MethodDesc *pMD)
{
LIMITED_METHOD_CONTRACT;
for (DWORD i = 0; i < m_cSlotData; i++)
{
if (m_pSlotData[i].pDeclMD == pMD)
{
return (&m_pSlotData[i]);
}
}
return (NULL);
}
//////////////////////////////////////////////////////////////////////////////////////////////
BOOL InteropMethodTableSlotDataMap::Exists(MethodDesc *pMD)
{
return (Exists_Helper(pMD) != NULL);
}
//////////////////////////////////////////////////////////////////////////////////////////////
InteropMethodTableSlotData *InteropMethodTableSlotDataMap::GetData(MethodDesc *pMD)
{
LIMITED_METHOD_CONTRACT;
InteropMethodTableSlotData *pEntry = Exists_Helper(pMD);
if (pEntry)
return pEntry;
pEntry = GetNewEntry();
pEntry->pMD = pMD;
pEntry->pDeclMD = pMD;
return (pEntry);
}
//////////////////////////////////////////////////////////////////////////////////////////////
InteropMethodTableSlotData *InteropMethodTableSlotDataMap::GetNewEntry()
{
WRAPPER_NO_CONTRACT;
_ASSERTE(m_iCurSlot < m_cSlotData);
InteropMethodTableSlotData *pEntry = &m_pSlotData[m_iCurSlot++];
pEntry->pMD = NULL;
pEntry->wFlags = 0;
pEntry->wSlot = MethodTable::NO_SLOT;
pEntry->pDeclMD = NULL;
return (pEntry);
}
namespace ClassCompat
{
//////////////////////////////////////////////////////////////////////////////////////////////
InteropMethodTableData *MethodTableBuilder::BuildInteropVTable(AllocMemTracker *pamTracker)
{
CONTRACTL {
STANDARD_VM_CHECK;
INSTANCE_CHECK;
} CONTRACTL_END;
MethodTable * pThisMT = GetHalfBakedMethodTable();
// This should never be called for interfaces or for generic types.
_ASSERTE(!pThisMT->IsInterface());
_ASSERTE(!pThisMT->ContainsGenericVariables());
_ASSERTE(!pThisMT->HasGenericClassInstantiationInHierarchy());
// Array method tables are created quite differently
if (pThisMT->IsArray())
return BuildInteropVTableForArray(pamTracker);
#ifdef _DEBUG
BOOL fDump = FALSE;
LPCUTF8 fullName = pThisMT->GetDebugClassName();
if (fullName) {
LPWSTR wszRegName = CLRConfig::GetConfigValue(CLRConfig::INTERNAL_BreakOnInteropVTableBuild);
if (wszRegName) {
{ // Poor man's narrow
LPWSTR fromPtr = wszRegName;
LPUTF8 toPtr = (LPUTF8) wszRegName;
LPUTF8 result = toPtr;
while(*fromPtr != 0)
*toPtr++ = (char) *fromPtr++;
*toPtr = 0;
}
LPCUTF8 regName = (LPCUTF8) wszRegName;
LPCUTF8 bracket = (LPCUTF8) strchr(fullName, '[');
size_t len = strlen(fullName);
if (bracket != NULL)
len = bracket - fullName;
if (strncmp(fullName, regName, len) == 0) {
_ASSERTE(!"BreakOnInteropVTableBuild");
fDump = TRUE;
}
delete [] wszRegName;
}
}
#endif // _DEBUG
//Get Check Point for the thread-based allocator
Thread *pThread = GetThread();
CheckPointHolder cph(pThread->m_MarshalAlloc.GetCheckpoint()); //hold checkpoint for autorelease
HRESULT hr = S_OK;
BaseDomain *bmtDomain = pThisMT->GetDomain();
Module *pModule = pThisMT->GetModule();
mdToken cl = pThisMT->GetCl();
MethodTable *pParentMethodTable = pThisMT->GetParentMethodTable();
// The following structs, defined as private members of MethodTableBuilder, contain the necessary local
// parameters needed for MethodTableBuilder
// Look at the struct definitions for a detailed list of all parameters available
// to MethodTableBuilder.
bmtErrorInfo bmtError;
bmtProperties bmtProp;
bmtVtable bmtVT;
bmtParentInfo bmtParent;
bmtInterfaceInfo bmtInterface;
bmtMethodInfo bmtMethod(pModule->GetMDImport());
bmtTypeInfo bmtType;
bmtMethodImplInfo bmtMethodImpl(pModule->GetMDImport());
//Initialize structs
bmtError.resIDWhy = IDS_CLASSLOAD_GENERAL; // Set the reason and the offending method def. If the method information
bmtError.pThrowable = NULL;
bmtError.pModule = pModule;
bmtError.cl = cl;
bmtType.pMDImport = pModule->GetMDImport();
bmtType.pModule = pModule;
bmtType.cl = cl;
bmtParent.parentSubst = GetHalfBakedMethodTable()->GetSubstitutionForParent(NULL);
if (FAILED(bmtType.pMDImport->GetTypeDefProps(
bmtType.cl,
&(bmtType.dwAttr),
&(bmtParent.token))))
{
BuildMethodTableThrowException(IDS_CLASSLOAD_BADFORMAT);
}
SetBMTData(
bmtDomain,
&bmtError,
&bmtProp,
&bmtVT,
&bmtParent,
&bmtInterface,
&bmtMethod,
&bmtType,
&bmtMethodImpl);
// Populate the BMT data structures from the attributes of the incoming MT
if (pThisMT->IsValueType()) SetIsValueClass();
if (pThisMT->IsEnum()) SetEnum();
if (pThisMT->HasLayout()) SetHasLayout();
if (pThisMT->IsDelegate()) SetIsDelegate();
if (pThisMT->IsContextful()) SetContextful();
#ifdef FEATURE_COMINTEROP
if(pThisMT->GetClass()->IsComClassInterface()) SetIsComClassInterface();
#endif
// Populate the interface list - these are allocated on the thread's stacking allocator
//@TODO: This doesn't work for generics - fix if generics will be exposed to COM
BuildingInterfaceInfo_t *pBuildingInterfaceList;
WORD wNumInterfaces;
BuildInteropVTable_InterfaceList(&pBuildingInterfaceList, &wNumInterfaces);
bmtInterface.wInterfaceMapSize = wNumInterfaces;
WORD i;
// Interfaces have a parent class of Object, but we don't really want to inherit all of
// Object's virtual methods, so pretend we don't have a parent class - at the bottom of this
// function we reset the parent method table
if (IsInterface())
{
pParentMethodTable = NULL;
}
bmtParent.pParentMethodTable = pParentMethodTable;
// Com Import classes are special
if (IsComImport() && !IsEnum() && !IsInterface() && !IsValueClass() && !IsDelegate())
{
_ASSERTE(pParentMethodTable == g_pBaseCOMObject || pThisMT->IsWinRTObjectType());
_ASSERTE(!(HasLayout()));
// if the current class is imported
bmtProp.fIsComObjectType = TRUE;
}
bmtParent.pParentMethodTable = pParentMethodTable;
if (pParentMethodTable != NULL)
{
if (pParentMethodTable->IsComObjectType())
{
// if the parent class is of ComObjectType
// so is the child
bmtProp.fIsComObjectType = TRUE;
}
}
// resolve unresolved interfaces, determine an upper bound on the size of the interface map,
// and determine the size of the largest interface (in # slots)
BuildInteropVTable_ResolveInterfaces(bmtDomain, pBuildingInterfaceList, &bmtType, &bmtInterface, &bmtVT, &bmtParent, bmtError);
// Enumerate this class's members
EnumerateMethodImpls();
// Enumerate this class's members
EnumerateClassMethods();
AllocateMethodWorkingMemory();
// Allocate the working memory for the interop data
{
////////////////
// The interop data for the VTable for COM Interop backward compatibility
// Allocate space to hold on to the MethodDesc for each entry
bmtVT.ppSDVtable = new (&pThread->m_MarshalAlloc) InteropMethodTableSlotData*[bmtVT.dwMaxVtableSize];
ZeroMemory(bmtVT.ppSDVtable, bmtVT.dwMaxVtableSize * sizeof(InteropMethodTableSlotData*));
// Allocate space to hold on to the MethodDesc for each entry
bmtVT.ppSDNonVtable = new (&pThread->m_MarshalAlloc) InteropMethodTableSlotData*[NumDeclaredMethods()];
ZeroMemory(bmtVT.ppSDNonVtable , sizeof(InteropMethodTableSlotData*)*NumDeclaredMethods());
DWORD cMaxEntries = (bmtVT.dwMaxVtableSize * 2) + (NumDeclaredMethods() * 2);
InteropMethodTableSlotData *pInteropData = new (&pThread->m_MarshalAlloc) InteropMethodTableSlotData[cMaxEntries];
memset(pInteropData, 0, cMaxEntries * sizeof(InteropMethodTableSlotData));
bmtVT.pInteropData = new (&pThread->m_MarshalAlloc) InteropMethodTableSlotDataMap(pInteropData, cMaxEntries);
// Initialize the map with parent information
if (bmtParent.pParentMethodTable != NULL)
{
InteropMethodTableData *pParentInteropData = bmtParent.pParentMethodTable->LookupComInteropData();
_ASSERTE(pParentInteropData);
for ( i = 0; i < pParentInteropData->cVTable; i++)
{
InteropMethodTableSlotData *pParentSlot = &pParentInteropData->pVTable[i];
InteropMethodTableSlotData *pNewEntry = bmtVT.pInteropData->GetData(pParentSlot->pDeclMD);
pNewEntry->pMD = pParentSlot->pMD;
pNewEntry->pDeclMD = pParentSlot->pDeclMD;
pNewEntry->wFlags = pParentSlot->wFlags;
pNewEntry->wSlot = pParentSlot->wSlot;
bmtVT.ppSDVtable[i] = pNewEntry;
}
}
}
// Determine vtable placement for each member in this class
BuildInteropVTable_PlaceMembers(bmtDomain,&bmtType, wNumInterfaces, pBuildingInterfaceList, &bmtMethod,
&bmtError, &bmtProp, &bmtParent, &bmtInterface, &bmtMethodImpl, &bmtVT);
// First copy what we can leverage from the parent's interface map.
// The parent's interface map will be identical to the beginning of this class's interface map (i.e.
// the interfaces will be listed in the identical order).
if (bmtParent.wNumParentInterfaces > 0)
{
PREFIX_ASSUME(pParentMethodTable != NULL); // We have to have parent to have parent interfaces
_ASSERTE(pParentMethodTable->LookupComInteropData());
_ASSERTE(bmtParent.wNumParentInterfaces == pParentMethodTable->LookupComInteropData()->cInterfaceMap);
InterfaceInfo_t *pParentInterfaceList = pParentMethodTable->LookupComInteropData()->pInterfaceMap;
for (i = 0; i < bmtParent.wNumParentInterfaces; i++)
{
#ifdef _DEBUG
_ASSERTE(pParentInterfaceList[i].m_pMethodTable == bmtInterface.pInterfaceMap[i].m_pMethodTable);
MethodTable *pMT = pParentInterfaceList[i].m_pMethodTable;
// If the interface resides entirely inside the parent's class methods (i.e. no duplicate
// slots), then we can place this interface in an identical spot to in the parent.
//
// Note carefully: the vtable for this interface could start within the first GetNumVirtuals()
// entries, but could actually extend beyond it, if we were particularly efficient at placing
// this interface, so check that the end of the interface vtable is before
// pParentMethodTable->GetNumVirtuals().
_ASSERTE(pParentInterfaceList[i].GetInteropStartSlot() + pMT->GetNumVirtuals() <=
pParentMethodTable->LookupComInteropData()->cVTable);
#endif // _DEBUG
// Interface lies inside parent's methods, so we can place it
bmtInterface.pInterfaceMap[i].SetInteropStartSlot(pParentInterfaceList[i].GetInteropStartSlot());
}
}
//
// If we are a class, then there may be some unplaced vtable methods (which are by definition
// interface methods, otherwise they'd already have been placed). Place as many unplaced methods
// as possible, in the order preferred by interfaces. However, do not allow any duplicates - once
// a method has been placed, it cannot be placed again - if we are unable to neatly place an interface,
// create duplicate slots for it starting at dwCurrentDuplicateVtableSlot. Fill out the interface
// map for all interfaces as they are placed.
//
// If we are an interface, then all methods are already placed. Fill out the interface map for
// interfaces as they are placed.
//
if (!IsInterface())
{
BuildInteropVTable_PlaceVtableMethods(
&bmtInterface,
wNumInterfaces,
pBuildingInterfaceList,
&bmtVT,
&bmtMethod,
&bmtType,
&bmtError,
&bmtProp,
&bmtParent);
BuildInteropVTable_PlaceMethodImpls(
bmtDomain,
&bmtType,
&bmtMethodImpl,
&bmtError,
&bmtInterface,
&bmtVT,
&bmtParent);
}
#ifdef _DEBUG
if (IsInterface() == FALSE)
{
for (i = 0; i < bmtInterface.wInterfaceMapSize; i++)
{
_ASSERTE(bmtInterface.pInterfaceMap[i].GetInteropStartSlot() != MethodTable::NO_SLOT);
}
}
#endif // _DEBUG
// Place all non vtable methods
for (i = 0; i < bmtVT.wCurrentNonVtableSlot; i++)
{
bmtVT.SetMethodDescForSlot(bmtVT.wCurrentVtableSlot + i, bmtVT.ppSDNonVtable[i]->pMD);
CONSISTENCY_CHECK(bmtVT.ppSDNonVtable[i]->wSlot != MethodTable::NO_SLOT);
bmtVT.ppSDVtable[bmtVT.wCurrentVtableSlot + i] = bmtVT.ppSDNonVtable[i];
}
// Must copy overridden slots to duplicate entries in the vtable
BuildInteropVTable_PropagateInheritance(&bmtVT);
// ensure we didn't overflow the temporary vtable
_ASSERTE(bmtVT.wCurrentNonVtableSlot <= bmtVT.dwMaxVtableSize);
// Finalize.
InteropMethodTableData *pInteropMT = NULL;
FinalizeInteropVTable(
pamTracker,
pThisMT->GetLoaderAllocator(),
&bmtVT,
&bmtInterface,
&bmtType,
&bmtProp,
&bmtMethod,
&bmtError,
&bmtParent,
&pInteropMT);
_ASSERTE(pInteropMT);
#ifdef _DEBUG
if (fDump)
{
CQuickBytes qb;
DWORD cb = 0;
PCCOR_SIGNATURE pSig;
ULONG cbSig;
printf("InteropMethodTable\n--------------\n");
printf("VTable\n------\n");
for (DWORD i = 0; i < pInteropMT->cVTable; i++)
{
// Print the method name
InteropMethodTableSlotData *pInteropMD = &pInteropMT->pVTable[i];
printf(pInteropMD->pMD->GetName());
printf(" ");
// Print the sig
if (FAILED(pInteropMD->pMD->GetMDImport()->GetSigOfMethodDef(pInteropMD->pMD->GetMemberDef(), &cbSig, &pSig)))
{
pSig = NULL;
cbSig = 0;
}
PrettyPrintSigInternalLegacy(pSig, cbSig, "", &qb, pInteropMD->pMD->GetMDImport());
printf((LPCUTF8) qb.Ptr());
printf("\n");
}
}
#endif // _DEBUG
NullBMTData();
return pInteropMT;
}
//---------------------------------------------------------------------------------------
InteropMethodTableData *MethodTableBuilder::BuildInteropVTableForArray(AllocMemTracker *pamTracker)
{
CONTRACTL {
STANDARD_VM_CHECK;
INSTANCE_CHECK;
PRECONDITION(GetHalfBakedMethodTable()->IsArray());
PRECONDITION(GetHalfBakedMethodTable()->GetNumVirtuals() == GetHalfBakedMethodTable()->GetParentMethodTable()->GetNumVirtuals());
} CONTRACTL_END;
MethodTable * pThisMT = GetHalfBakedMethodTable();
// Get the interop data for the parent
MethodTable *pParentMT = pThisMT->GetParentMethodTable();
InteropMethodTableData *pParentMTData = pParentMT->GetComInteropData();
CONSISTENCY_CHECK(pParentMTData != NULL);
// Allocate in the same heap as the array itself
LoaderHeap *pHeap = pThisMT->GetLoaderAllocator()->GetLowFrequencyHeap();
// Allocate the overall structure
InteropMethodTableData *pMTData = (InteropMethodTableData *)(void *) pamTracker->Track(pHeap->AllocMem(S_SIZE_T(sizeof(InteropMethodTableData))));
memset(pMTData, 0, sizeof(InteropMethodTableData));
// Allocate the vtable - this is just a copy from System.Array
pMTData->cVTable = pParentMTData->cVTable;
if (pMTData->cVTable != 0)
{
pMTData->pVTable = (InteropMethodTableSlotData *)(void *)
pamTracker->Track(pHeap->AllocMem(S_SIZE_T(sizeof(InteropMethodTableSlotData)) * S_SIZE_T(pMTData->cVTable)));
// Copy the vtable
for (DWORD i = 0; i < pMTData->cVTable; i++)
pMTData->pVTable[i] = pParentMTData->pVTable[i];
}
// Allocate the non-vtable
pMTData->cNonVTable = pThisMT->GetNumMethods() - pThisMT->GetNumVirtuals();
if (pMTData->cNonVTable != 0)
{
pMTData->pNonVTable = (InteropMethodTableSlotData *)(void *)
pamTracker->Track(pHeap->AllocMem(S_SIZE_T(sizeof(InteropMethodTableSlotData)) * S_SIZE_T(pMTData->cNonVTable)));
// Copy the non-vtable
UINT32 iCurRealSlot = pThisMT->GetNumVirtuals();
WORD iCurInteropSlot = pMTData->cVTable;
for (DWORD i = 0; i < pMTData->cNonVTable; i++, iCurRealSlot++, iCurInteropSlot++)
{
pMTData->pNonVTable[i].wSlot = iCurInteropSlot;
pMTData->pNonVTable[i].pMD = pThisMT->GetMethodDescForSlot(iCurRealSlot);
}
}
// Allocate the interface map
pMTData->cInterfaceMap = pParentMTData->cInterfaceMap;
if (pMTData->cInterfaceMap != 0)
{
pMTData->pInterfaceMap = (InterfaceInfo_t *)(void *)
pamTracker->Track(pHeap->AllocMem(S_SIZE_T(sizeof(InterfaceInfo_t)) * S_SIZE_T(pMTData->cInterfaceMap)));
// Copy the interface map
for (DWORD i = 0; i < pMTData->cInterfaceMap; i++)
pMTData->pInterfaceMap[i] = pParentMTData->pInterfaceMap[i];
}
return pMTData;
}
//---------------------------------------------------------------------------------------
VOID MethodTableBuilder::BuildInteropVTable_InterfaceList(
BuildingInterfaceInfo_t **ppBuildingInterfaceList,
WORD *pcBuildingInterfaceList)
{
STANDARD_VM_CONTRACT;
// Initialize arguments
*pcBuildingInterfaceList = 0;
*ppBuildingInterfaceList = NULL;
// Get the thread for stacking allocator
Thread *pThread = GetThread();
// Get the metadata for enumerating the interfaces of the class
IMDInternalImport *pMDImport = GetModule()->GetMDImport();
// Now load all the interfaces
HENUMInternalHolder hEnumInterfaceImpl(pMDImport);
hEnumInterfaceImpl.EnumInit(mdtInterfaceImpl, GetCl());
// Get the count for the number of interfaces from metadata
DWORD cAllInterfaces = pMDImport->EnumGetCount(&hEnumInterfaceImpl);
WORD cNonGenericItfs = 0;
// Iterate through each interface token and get the type for the interface and put
// it into the BuildingInterfaceInfo_t struct.
if (cAllInterfaces != 0)
{
mdInterfaceImpl ii;
Module *pModule = GetModule();
// Allocate the BuildingInterfaceList table
*ppBuildingInterfaceList = new(&pThread->m_MarshalAlloc) BuildingInterfaceInfo_t[cAllInterfaces];
BuildingInterfaceInfo_t *pInterfaceBuildInfo = *ppBuildingInterfaceList;
while (pMDImport->EnumNext(&hEnumInterfaceImpl, &ii))
{
mdTypeRef crInterface;
TypeHandle intType;
// Get properties on this interface
if (FAILED(pMDImport->GetTypeOfInterfaceImpl(ii, &crInterface)))
{
BuildMethodTableThrowException(IDS_CLASSLOAD_BADFORMAT);
}
SigTypeContext typeContext = SigTypeContext(TypeHandle(GetHalfBakedMethodTable()));
intType = ClassLoader::LoadTypeDefOrRefOrSpecThrowing(pModule, crInterface, &typeContext,
ClassLoader::ThrowIfNotFound,
ClassLoader::FailIfUninstDefOrRef);
// At this point, the interface should never have any non instantiated generic parameters.
_ASSERTE(!intType.IsGenericTypeDefinition());
// Skip any generic interfaces.
if (intType.GetNumGenericArgs() != 0)
continue;
pInterfaceBuildInfo[cNonGenericItfs].m_pMethodTable = intType.AsMethodTable();
_ASSERTE(pInterfaceBuildInfo[cNonGenericItfs].m_pMethodTable != NULL);
_ASSERTE(pInterfaceBuildInfo[cNonGenericItfs].m_pMethodTable->IsInterface());
cNonGenericItfs++;
}
_ASSERTE(cNonGenericItfs <= cAllInterfaces);
}
*pcBuildingInterfaceList = cNonGenericItfs;
}
//---------------------------------------------------------------------------------------
// Used by BuildInteropVTable
//
// Determine vtable placement for each member in this class
//
#ifdef _PREFAST_
#pragma warning(push)
#pragma warning(disable:21000) // Suppress PREFast warning about overly large function
#endif
VOID MethodTableBuilder::BuildInteropVTable_PlaceMembers(
BaseDomain *bmtDomain,
bmtTypeInfo* bmtType,
DWORD numDeclaredInterfaces,
BuildingInterfaceInfo_t *pBuildingInterfaceList,
bmtMethodInfo* bmtMethod,
bmtErrorInfo* bmtError,
bmtProperties* bmtProp,
bmtParentInfo* bmtParent,
bmtInterfaceInfo* bmtInterface,
bmtMethodImplInfo* bmtMethodImpl,
bmtVtable* bmtVT)
{
CONTRACTL
{
STANDARD_VM_CHECK;
PRECONDITION(CheckPointer(this));
PRECONDITION(CheckPointer(bmtType));
PRECONDITION(CheckPointer(bmtMethod));
PRECONDITION(CheckPointer(bmtError));
PRECONDITION(CheckPointer(bmtProp));
PRECONDITION(CheckPointer(bmtInterface));
PRECONDITION(CheckPointer(bmtParent));
PRECONDITION(CheckPointer(bmtMethodImpl));
PRECONDITION(CheckPointer(bmtVT));
}
CONTRACTL_END;
_ASSERTE(!IsInterface());
Module * pModule = GetModule();
#ifdef _DEBUG
LPCUTF8 pszDebugName,pszDebugNamespace;
if (FAILED(bmtType->pModule->GetMDImport()->GetNameOfTypeDef(GetCl(), &pszDebugName, &pszDebugNamespace)))
{
pszDebugName = pszDebugNamespace = "Invalid TypeDef record";
}
#endif // _DEBUG
HRESULT hr = S_OK;
DWORD i, j;
DWORD dwClassDeclFlags = 0xffffffff;
DWORD dwClassNullDeclFlags = 0xffffffff;
for (i = 0; i < NumDeclaredMethods(); i++)
{
LPCUTF8 szMemberName = NULL;
PCCOR_SIGNATURE pMemberSignature = NULL;
DWORD cMemberSignature = 0;
mdToken tokMember;
DWORD dwMemberAttrs;
DWORD dwDescrOffset;
DWORD dwImplFlags;
BOOL fMethodImplementsInterface = FALSE;
DWORD dwMDImplementsInterfaceNum = 0;
DWORD dwMDImplementsSlotNum = 0;
DWORD dwParentAttrs;
tokMember = bmtMethod->rgMethodTokens[i];
dwMemberAttrs = bmtMethod->rgMethodAttrs[i];
dwDescrOffset = bmtMethod->rgMethodRVA[i];
dwImplFlags = bmtMethod->rgMethodImplFlags[i];
DWORD Classification = bmtMethod->rgMethodClassifications[i];
// If this member is a method which overrides a parent method, it will be set to non-NULL
MethodDesc *pParentMethodDesc = NULL;
szMemberName = bmtMethod->rgszMethodName[i];
// constructors and class initialisers are special
if (!IsMdRTSpecialName(dwMemberAttrs))
{
// The method does not have the special marking
if (IsMdVirtual(dwMemberAttrs))
{
// Hash that a method with this name exists in this class
// Note that ctors and static ctors are not added to the table
DWORD dwHashName = HashStringA(szMemberName);
// If the member is marked with a new slot we do not need to find it
// in the parent
if (!IsMdNewSlot(dwMemberAttrs))
{
// If we're not doing sanity checks, then assume that any method declared static
// does not attempt to override some virtual parent.
if (!IsMdStatic(dwMemberAttrs) && bmtParent->pParentMethodTable != NULL)
{
// Attempt to find the method with this name and signature in the parent class.
// This method may or may not create pParentMethodHash (if it does not already exist).
// It also may or may not fill in pMemberSignature/cMemberSignature.
// An error is only returned when we can not create the hash.
// NOTE: This operation touches metadata
{
BOOL fMethodConstraintsMatch = FALSE;
VERIFY(SUCCEEDED(LoaderFindMethodInClass(
szMemberName,
bmtType->pModule,
tokMember,
&pParentMethodDesc,
&pMemberSignature, &cMemberSignature,
dwHashName,
&fMethodConstraintsMatch)));
//this assert should hold because interop methods cannot be generic
_ASSERTE(pParentMethodDesc == NULL || fMethodConstraintsMatch);
}
if (pParentMethodDesc != NULL)
{
dwParentAttrs = pParentMethodDesc->GetAttrs();
_ASSERTE(IsMdVirtual(dwParentAttrs) && "Non virtual methods should not be searched");
_ASSERTE(!(IsMdFinal(dwParentAttrs)));
}
}
}
}
}
if(pParentMethodDesc == NULL) {
// This method does not exist in the parent. If we are a class, check whether this
// method implements any interface. If true, we can't place this method now.
if ((!IsInterface()) &&
( IsMdPublic(dwMemberAttrs) &&
IsMdVirtual(dwMemberAttrs) &&
!IsMdStatic(dwMemberAttrs) &&
!IsMdRTSpecialName(dwMemberAttrs))) {
// Don't check parent class interfaces - if the parent class had to implement an interface,
// then it is already guaranteed that we inherited that method.
_ASSERTE(!bmtParent->pParentMethodTable || bmtParent->pParentMethodTable->LookupComInteropData());
DWORD numInheritedInts = (bmtParent->pParentMethodTable ?
(DWORD) bmtParent->pParentMethodTable->LookupComInteropData()->cInterfaceMap: 0);
for (j = numInheritedInts; j < bmtInterface->wInterfaceMapSize; j++)
{
MethodTable *pInterface = bmtInterface->pInterfaceMap[j].m_pMethodTable;
if (pMemberSignature == NULL)
{ // We've been trying to avoid asking for the signature - now we need it
if (FAILED(bmtType->pMDImport->GetSigOfMethodDef(tokMember, &cMemberSignature, &pMemberSignature)))
{
BuildMethodTableThrowException(IDS_CLASSLOAD_BADFORMAT);
}
}
WORD slotNum = (WORD) (-1);
MethodDesc *pItfMD = MemberLoader::FindMethod(pInterface,
szMemberName, pMemberSignature, cMemberSignature, bmtType->pModule);
if (pItfMD != NULL)
{
// This method implements an interface - don't place it
fMethodImplementsInterface = TRUE;
// Keep track of this fact and use it while placing the interface
slotNum = (WORD) pItfMD->GetSlot();
if (bmtInterface->pppInterfaceImplementingMD[j] == NULL)
{
Thread *pThread = GetThread();
StackingAllocator * pAlloc = &pThread->m_MarshalAlloc;
bmtInterface->pppInterfaceImplementingMD[j] = new (pAlloc) MethodDesc * [pInterface->GetNumVirtuals()];
memset(bmtInterface->pppInterfaceImplementingMD[j], 0, sizeof(MethodDesc *) * pInterface->GetNumVirtuals());
bmtInterface->pppInterfaceDeclaringMD[j] = new (pAlloc) MethodDesc * [pInterface->GetNumVirtuals()];
memset(bmtInterface->pppInterfaceDeclaringMD[j], 0, sizeof(MethodDesc *) * pInterface->GetNumVirtuals());
}
bmtInterface->pppInterfaceDeclaringMD[j][slotNum] = pItfMD;
dwMDImplementsInterfaceNum = j;
dwMDImplementsSlotNum = slotNum;
break;
}
}
}
}
// Now find the MethodDesc associated with this method
MethodDesc *pNewMD = MemberLoader::FindMethod(GetHalfBakedMethodTable(), tokMember);
_ASSERTE(!bmtVT->pInteropData->Exists(pNewMD));
InteropMethodTableSlotData *pNewMDData = bmtVT->pInteropData->GetData(pNewMD);
_ASSERTE(pNewMD != NULL);
_ASSERTE(dwMemberAttrs == pNewMD->GetAttrs());
_ASSERTE(bmtParent->ppParentMethodDescBufPtr != NULL);
_ASSERTE(((bmtParent->ppParentMethodDescBufPtr - bmtParent->ppParentMethodDescBuf) / sizeof(MethodDesc*))
< NumDeclaredMethods());
*(bmtParent->ppParentMethodDescBufPtr++) = pParentMethodDesc;
*(bmtParent->ppParentMethodDescBufPtr++) = pNewMD;
if (fMethodImplementsInterface && IsMdVirtual(dwMemberAttrs))
{
bmtInterface->pppInterfaceImplementingMD[dwMDImplementsInterfaceNum][dwMDImplementsSlotNum] = pNewMD;
}
// Set the MethodDesc value
bmtMethod->ppMethodDescList[i] = pNewMD;
// Make sure that fcalls have a 0 rva. This is assumed by the prejit fixup logic
_ASSERTE(((Classification & ~mdcMethodImpl) != mcFCall) || dwDescrOffset == 0);
// Non-virtual method
if (IsMdStatic(dwMemberAttrs) ||
!IsMdVirtual(dwMemberAttrs) ||
IsMdRTSpecialName(dwMemberAttrs))
{
// Non-virtual method (doesn't go into the vtable)
_ASSERTE(bmtVT->pNonVtableMD[bmtVT->wCurrentNonVtableSlot] == NULL);
// Set the data for the method
pNewMDData->wSlot = bmtVT->wCurrentNonVtableSlot;
// Add the slot into the non-virtual method table
bmtVT->pNonVtableMD[bmtVT->wCurrentNonVtableSlot] = pNewMD;
bmtVT->ppSDNonVtable[bmtVT->wCurrentNonVtableSlot] = pNewMDData;
// Increment the current non-virtual method table slot
bmtVT->wCurrentNonVtableSlot++;
}
// Virtual method
else
{
if (IsInterface())
{ // (shouldn't happen for this codepath)
UNREACHABLE();
}
else if (pParentMethodDesc != NULL)
{ // We are overriding a parent's vtable slot
CONSISTENCY_CHECK(bmtVT->pInteropData->Exists(pParentMethodDesc));
WORD slotNumber = bmtVT->pInteropData->GetData(pParentMethodDesc)->wSlot;
// If the MethodDesc was inherited by an interface but not implemented,
// then the interface's MethodDesc is sitting in the slot and will not reflect
// the true slot number. Need to find the starting slot of the interface in
// the parent class to figure out the true slot (starting slot + itf slot)
if (pParentMethodDesc->IsInterface())
{
MethodTable *pItfMT = pParentMethodDesc->GetMethodTable();
WORD startSlot = bmtParent->pParentMethodTable->LookupComInteropData()->GetStartSlotForInterface(pItfMT);
_ASSERTE(startSlot != (WORD) -1);
slotNumber += startSlot;
}
// we are overriding a parent method, so place this method now
bmtVT->SetMethodDescForSlot(slotNumber, pNewMD);
bmtVT->ppSDVtable[slotNumber] = pNewMDData;
pNewMDData->wSlot = slotNumber;
}
else if (!fMethodImplementsInterface)
{ // Place it unless we will do it when laying out an interface or it is a body to
// a method impl. If it is an impl then we will use the slots used by the definition.
// Store the slot for this method
pNewMDData->wSlot = bmtVT->wCurrentVtableSlot;
// Now copy the method into the vtable, and interop data
bmtVT->SetMethodDescForSlot(bmtVT->wCurrentVtableSlot, pNewMD);
bmtVT->ppSDVtable[bmtVT->wCurrentVtableSlot] = pNewMDData;
// Increment current vtable slot, since we're not overriding a parent slot
bmtVT->wCurrentVtableSlot++;
}
}
if(Classification & mdcMethodImpl)
{ // If this method serves as the BODY of a MethodImpl specification, then
// we should iterate all the MethodImpl's for this class and see just how many
// of them this method participates in as the BODY.
for(DWORD m = 0; m < bmtMethodImpl->dwNumberMethodImpls; m++)
{
if(tokMember == bmtMethodImpl->rgMethodImplTokens[m].methodBody)
{
MethodDesc* desc = NULL;
BOOL fIsMethod;
mdToken mdDecl = bmtMethodImpl->rgMethodImplTokens[m].methodDecl;
Substitution *pDeclSubst = &bmtMethodImpl->pMethodDeclSubsts[m];
// Get the parent
mdToken tkParent = mdTypeDefNil;
if (TypeFromToken(mdDecl) == mdtMethodDef || TypeFromToken(mdDecl) == mdtMemberRef)
{
hr = bmtType->pMDImport->GetParentToken(mdDecl,&tkParent);
if (FAILED(hr))
{
BuildMethodTableThrowException(hr, *bmtError);
}
}
if (GetCl() == tkParent)
{ // The DECL has been declared
// within the class that we're currently building.
hr = S_OK;
if(bmtError->pThrowable != NULL)
*(bmtError->pThrowable) = NULL;
// <TODO>Verify that the substitution doesn't change for this case </TODO>
if(TypeFromToken(mdDecl) != mdtMethodDef) {
hr = FindMethodDeclarationForMethodImpl(
bmtType->pMDImport,
GetCl(),
mdDecl,