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dllimport.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: DllImport.cpp
//
//
// P/Invoke support.
//
#include "common.h"
#include "vars.hpp"
#include "stublink.h"
#include "threads.h"
#include "excep.h"
#include "dllimport.h"
#include "method.hpp"
#include "siginfo.hpp"
#include "comdelegate.h"
#include "ceeload.h"
#include "mlinfo.h"
#include "eeconfig.h"
#include "comutilnative.h"
#include "corhost.h"
#include "asmconstants.h"
#include "mdaassistants.h"
#include "customattribute.h"
#include "ilstubcache.h"
#include "typeparse.h"
#include "sigbuilder.h"
#include "sigformat.h"
#include "strongnameholders.h"
#include "ecall.h"
#include <formattype.h>
#include "../md/compiler/custattr.h"
#ifdef FEATURE_COMINTEROP
#include "runtimecallablewrapper.h"
#include "clrtocomcall.h"
#endif // FEATURE_COMINTEROP
#ifdef FEATURE_PREJIT
#include "compile.h"
#endif // FEATURE_PREJIT
#include "eventtrace.h"
#include "clr/fs/path.h"
using namespace clr::fs;
// remove when we get an updated SDK
#define LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR 0x00000100
#define LOAD_LIBRARY_SEARCH_DEFAULT_DIRS 0x00001000
void AppendEHClause(int nClauses, COR_ILMETHOD_SECT_EH * pEHSect, ILStubEHClause * pClause, int * pCurIdx)
{
LIMITED_METHOD_CONTRACT;
if (pClause->kind == ILStubEHClause::kNone)
return;
int idx = *pCurIdx;
*pCurIdx = idx + 1;
CorExceptionFlag flags;
switch (pClause->kind)
{
case ILStubEHClause::kFinally: flags = COR_ILEXCEPTION_CLAUSE_FINALLY; break;
case ILStubEHClause::kTypedCatch: flags = COR_ILEXCEPTION_CLAUSE_NONE; break;
default:
UNREACHABLE_MSG("unexpected ILStubEHClause kind");
}
_ASSERTE(idx < nClauses);
pEHSect->Fat.Clauses[idx].Flags = flags;
pEHSect->Fat.Clauses[idx].TryOffset = pClause->dwTryBeginOffset;
pEHSect->Fat.Clauses[idx].TryLength = pClause->cbTryLength;
pEHSect->Fat.Clauses[idx].HandlerOffset = pClause->dwHandlerBeginOffset;
pEHSect->Fat.Clauses[idx].HandlerLength = pClause->cbHandlerLength;
pEHSect->Fat.Clauses[idx].ClassToken = pClause->dwTypeToken;
}
VOID PopulateEHSect(COR_ILMETHOD_SECT_EH * pEHSect, int nClauses, ILStubEHClause * pOne, ILStubEHClause * pTwo)
{
LIMITED_METHOD_CONTRACT;
pEHSect->Fat.Kind = (CorILMethod_Sect_EHTable | CorILMethod_Sect_FatFormat);
pEHSect->Fat.DataSize = COR_ILMETHOD_SECT_EH_FAT::Size(nClauses);
int curIdx = 0;
AppendEHClause(nClauses, pEHSect, pOne, &curIdx);
AppendEHClause(nClauses, pEHSect, pTwo, &curIdx);
}
StubSigDesc::StubSigDesc(MethodDesc *pMD, PInvokeStaticSigInfo* pSigInfo /*= NULL*/)
{
CONTRACTL
{
NOTHROW;
GC_NOTRIGGER;
SUPPORTS_DAC;
}
CONTRACTL_END
m_pMD = pMD;
if (pSigInfo != NULL)
{
m_sig = pSigInfo->GetSignature();
m_pModule = pSigInfo->GetModule();
}
else
{
_ASSERTE(pMD != NULL);
m_sig = pMD->GetSignature();
m_pModule = pMD->GetModule(); // Used for token resolution.
}
if (pMD != NULL)
{
m_tkMethodDef = pMD->GetMemberDef();
SigTypeContext::InitTypeContext(pMD, &m_typeContext);
m_pLoaderModule = pMD->GetLoaderModule(); // Used for ILStubCache selection and MethodTable creation.
}
else
{
m_tkMethodDef = mdMethodDefNil;
m_pLoaderModule = m_pModule;
}
INDEBUG(InitDebugNames());
}
StubSigDesc::StubSigDesc(MethodDesc *pMD, Signature sig, Module *pModule)
{
CONTRACTL
{
NOTHROW;
GC_NOTRIGGER;
SUPPORTS_DAC;
PRECONDITION(!sig.IsEmpty());
PRECONDITION(pModule != NULL);
}
CONTRACTL_END
m_pMD = pMD;
m_sig = sig;
m_pModule = pModule;
if (pMD != NULL)
{
m_tkMethodDef = pMD->GetMemberDef();
SigTypeContext::InitTypeContext(pMD, &m_typeContext);
m_pLoaderModule = pMD->GetLoaderModule(); // Used for ILStubCache selection and MethodTable creation.
}
else
{
m_tkMethodDef = mdMethodDefNil;
m_pLoaderModule = m_pModule;
}
INDEBUG(InitDebugNames());
}
#ifndef DACCESS_COMPILE
class StubState
{
public:
virtual void SetLastError(BOOL fSetLastError) = 0;
virtual void BeginEmit(DWORD dwStubFlags) = 0;
virtual void MarshalReturn(MarshalInfo* pInfo, int argOffset) = 0;
virtual void MarshalArgument(MarshalInfo* pInfo, int argOffset, UINT nativeStackOffset) = 0;
virtual void MarshalLCID(int argIdx) = 0;
#ifdef FEATURE_COMINTEROP
virtual void MarshalHiddenLengthArgument(MarshalInfo *pInfo, BOOL isForReturnArray) = 0;
virtual void MarshalFactoryReturn() = 0;
#endif // FEATURE_COMINTEROP
virtual void EmitInvokeTarget(MethodDesc *pStubMD) = 0;
virtual void FinishEmit(MethodDesc* pMD) = 0;
virtual ~StubState()
{
LIMITED_METHOD_CONTRACT;
}
};
class ILStubState : public StubState
{
protected:
ILStubState(
Module* pStubModule,
const Signature &signature,
SigTypeContext* pTypeContext,
BOOL fTargetHasThis,
BOOL fStubHasThis,
DWORD dwStubFlags,
int iLCIDParamIdx,
MethodDesc* pTargetMD)
: m_slIL(dwStubFlags, pStubModule, signature, pTypeContext, pTargetMD, iLCIDParamIdx, fTargetHasThis, fStubHasThis)
{
STANDARD_VM_CONTRACT;
m_fSetLastError = 0;
}
public:
void SetLastError(BOOL fSetLastError)
{
LIMITED_METHOD_CONTRACT;
m_fSetLastError = fSetLastError;
}
// We use three stub linkers to generate IL stubs. The pre linker is the main one. It does all the marshaling and
// then calls the target method. The post return linker is only used to unmarshal the return value after we return
// from the target method. The post linker handles all the unmarshaling for by ref arguments and clean-up. It
// also checks if we should throw an exception etc.
//
// Currently, we have two "emittable" ILCodeLabel's. The first one is at the beginning of the pre linker. This
// label is used to emit code to declare and initialize clean-up flags. Each argument which requires clean-up
// emits one flag. This flag is set only after the marshaling is done, and it is checked before we do any clean-up
// in the finally.
//
// The second "emittable" ILCodeLabel is at the beginning of the post linker. It is used to emit code which is
// not safe to run in the case of an exception. The rest of the post linker is wrapped in a finally, and it contains
// with the necessary clean-up which should be executed in both normal and exception cases.
void BeginEmit(DWORD dwStubFlags)
{
WRAPPER_NO_CONTRACT;
m_slIL.Begin(dwStubFlags);
m_dwStubFlags = dwStubFlags;
}
void MarshalReturn(MarshalInfo* pInfo, int argOffset)
{
CONTRACTL
{
STANDARD_VM_CHECK;
PRECONDITION(CheckPointer(pInfo));
}
CONTRACTL_END;
pInfo->GenerateReturnIL(&m_slIL, argOffset,
SF_IsForwardStub(m_dwStubFlags),
SF_IsFieldGetterStub(m_dwStubFlags),
SF_IsHRESULTSwapping(m_dwStubFlags));
}
void MarshalArgument(MarshalInfo* pInfo, int argOffset, UINT nativeStackOffset)
{
CONTRACTL
{
STANDARD_VM_CHECK;
PRECONDITION(CheckPointer(pInfo));
}
CONTRACTL_END;
pInfo->GenerateArgumentIL(&m_slIL, argOffset, nativeStackOffset, SF_IsForwardStub(m_dwStubFlags));
}
#ifdef FEATURE_COMINTEROP
// Marshal the hidden length parameter for the managed parameter in pInfo
virtual void MarshalHiddenLengthArgument(MarshalInfo *pInfo, BOOL isForReturnArray)
{
STANDARD_VM_CONTRACT;
pInfo->MarshalHiddenLengthArgument(&m_slIL, SF_IsForwardStub(m_dwStubFlags), isForReturnArray);
if (SF_IsReverseStub(m_dwStubFlags))
{
// Hidden length arguments appear explicitly in the native signature
// however, they are not in the managed signature.
m_slIL.AdjustTargetStackDeltaForExtraParam();
}
}
void MarshalFactoryReturn()
{
CONTRACTL
{
STANDARD_VM_CHECK;
PRECONDITION(SF_IsCOMStub(m_dwStubFlags));
PRECONDITION(SF_IsWinRTCtorStub(m_dwStubFlags));
}
CONTRACTL_END;
ILCodeStream *pcsSetup = m_slIL.GetSetupCodeStream();
ILCodeStream *pcsDispatch = m_slIL.GetDispatchCodeStream();
ILCodeStream *pcsUnmarshal = m_slIL.GetReturnUnmarshalCodeStream();
ILCodeStream *pcsCleanup = m_slIL.GetCleanupCodeStream();
/*
* SETUP
*/
// create a local to hold the returned pUnk and initialize to 0 in case the factory fails
// and we try to release it during cleanup
LocalDesc locDescFactoryRetVal(ELEMENT_TYPE_I);
DWORD dwFactoryRetValLocalNum = pcsSetup->NewLocal(locDescFactoryRetVal);
pcsSetup->EmitLoadNullPtr();
pcsSetup->EmitSTLOC(dwFactoryRetValLocalNum);
DWORD dwInnerIInspectableLocalNum = -1;
DWORD dwOuterIInspectableLocalNum = -1;
if (SF_IsWinRTCompositionStub(m_dwStubFlags))
{
// Create locals to store the outer and inner IInspectable values and initialize to null
// Note that we do this in the setup stream so that we're guaranteed to have a null-initialized
// value in the cleanup stream
LocalDesc locDescOuterIInspectable(ELEMENT_TYPE_I);
dwOuterIInspectableLocalNum = pcsSetup->NewLocal(locDescOuterIInspectable);
pcsSetup->EmitLoadNullPtr();
pcsSetup->EmitSTLOC(dwOuterIInspectableLocalNum);
LocalDesc locDescInnerIInspectable(ELEMENT_TYPE_I);
dwInnerIInspectableLocalNum = pcsSetup->NewLocal(locDescInnerIInspectable);
pcsSetup->EmitLoadNullPtr();
pcsSetup->EmitSTLOC(dwInnerIInspectableLocalNum);
}
/*
* DISPATCH
*/
// For composition factories, add the two extra params
if (SF_IsWinRTCompositionStub(m_dwStubFlags))
{
// Get outer IInspectable. The helper will return NULL if this is the "top-level" constructor,
// and the appropriate outer pointer otherwise.
pcsDispatch->EmitLoadThis();
m_slIL.EmitLoadStubContext(pcsDispatch, m_dwStubFlags);
pcsDispatch->EmitCALL(METHOD__STUBHELPERS__GET_OUTER_INSPECTABLE, 2, 1);
pcsDispatch->EmitSTLOC(dwOuterIInspectableLocalNum);
// load the outer IInspectable (3rd last argument)
pcsDispatch->SetStubTargetArgType(ELEMENT_TYPE_I, false);
pcsDispatch->EmitLDLOC(dwOuterIInspectableLocalNum);
// pass pointer to where inner non-delegating IInspectable should be stored (2nd last argument)
LocalDesc locDescInnerPtr(ELEMENT_TYPE_I);
locDescInnerPtr.MakeByRef();
pcsDispatch->SetStubTargetArgType(&locDescInnerPtr, false);
pcsDispatch->EmitLDLOCA(dwInnerIInspectableLocalNum);
}
// pass pointer to the local to the factory method (last argument)
locDescFactoryRetVal.MakeByRef();
pcsDispatch->SetStubTargetArgType(&locDescFactoryRetVal, false);
pcsDispatch->EmitLDLOCA(dwFactoryRetValLocalNum);
/*
* UNMARSHAL
*/
// Mark that the factory method has succesfully returned and so cleanup will be necessary after
// this point.
m_slIL.EmitSetArgMarshalIndex(pcsUnmarshal, NDirectStubLinker::CLEANUP_INDEX_RETVAL_UNMARSHAL);
// associate the 'this' RCW with one of the returned interface pointers
pcsUnmarshal->EmitLoadThis();
// now we need to find the right interface pointer to load
if (dwInnerIInspectableLocalNum != -1)
{
// We may have a composition scenario
ILCodeLabel* pNonCompositionLabel = pcsUnmarshal->NewCodeLabel();
ILCodeLabel* pLoadedLabel = pcsUnmarshal->NewCodeLabel();
// Did we pass an outer IInspectable?
pcsUnmarshal->EmitLDLOC(dwOuterIInspectableLocalNum);
pcsUnmarshal->EmitBRFALSE(pNonCompositionLabel);
// yes, this is a composition scenario
{
// ignore the delegating interface pointer (will be released in cleanup below) - we can
// re-create it by QI'ing the non-delegating one.
// Note that using this could be useful in the future (avoids an extra QueryInterface call)
// Just load the non-delegating interface pointer
pcsUnmarshal->EmitLDLOCA(dwInnerIInspectableLocalNum);
pcsUnmarshal->EmitBR(pLoadedLabel);
}
// else, no this is a non-composition scenario
{
pcsUnmarshal->EmitLabel(pNonCompositionLabel);
// ignore the non-delegating interface pointer (which should be null, but will regardless get
// cleaned up below in the event the factory doesn't follow the pattern properly).
// Just load the regular delegating interface pointer
pcsUnmarshal->EmitLDLOCA(dwFactoryRetValLocalNum);
}
pcsUnmarshal->EmitLabel(pLoadedLabel);
}
else
{
// Definitely can't be a composition scenario - use the only pointer we have
pcsUnmarshal->EmitLDLOCA(dwFactoryRetValLocalNum);
}
pcsUnmarshal->EmitCALL(METHOD__WINDOWSRUNTIMEMARSHAL__INITIALIZE_WRAPPER, 2, 0);
/*
* CLEANUP
*/
// release the returned interface pointer in the finally block
m_slIL.SetCleanupNeeded();
ILCodeLabel *pSkipCleanupLabel = pcsCleanup->NewCodeLabel();
m_slIL.EmitCheckForArgCleanup(pcsCleanup,
NDirectStubLinker::CLEANUP_INDEX_RETVAL_UNMARSHAL,
NDirectStubLinker::BranchIfNotMarshaled,
pSkipCleanupLabel);
EmitInterfaceClearNative(pcsCleanup, dwFactoryRetValLocalNum);
// Note that it's a no-op to pass NULL to Clear_Native, so we call it even though we don't
// know if we assigned to the inner/outer IInspectable
if (dwInnerIInspectableLocalNum != -1)
{
EmitInterfaceClearNative(pcsCleanup, dwInnerIInspectableLocalNum);
}
if (dwOuterIInspectableLocalNum != -1)
{
EmitInterfaceClearNative(pcsCleanup, dwOuterIInspectableLocalNum);
}
pcsCleanup->EmitLabel(pSkipCleanupLabel);
}
static void EmitInterfaceClearNative(ILCodeStream* pcsEmit, DWORD dwLocalNum)
{
STANDARD_VM_CONTRACT;
ILCodeLabel *pSkipClearNativeLabel = pcsEmit->NewCodeLabel();
pcsEmit->EmitLDLOC(dwLocalNum);
pcsEmit->EmitBRFALSE(pSkipClearNativeLabel);
pcsEmit->EmitLDLOC(dwLocalNum);
pcsEmit->EmitCALL(METHOD__INTERFACEMARSHALER__CLEAR_NATIVE, 1, 0);
pcsEmit->EmitLabel(pSkipClearNativeLabel);
}
#endif // FEATURE_COMINTEROP
void MarshalLCID(int argIdx)
{
STANDARD_VM_CONTRACT;
ILCodeStream* pcs = m_slIL.GetDispatchCodeStream();
#ifdef FEATURE_USE_LCID
if (SF_IsReverseStub(m_dwStubFlags))
{
if ((m_slIL.GetStubTargetCallingConv() & IMAGE_CEE_CS_CALLCONV_HASTHIS) == IMAGE_CEE_CS_CALLCONV_HASTHIS)
{
// the arg number will be incremented by LDARG if we are in an instance method
_ASSERTE(argIdx > 0);
argIdx--;
}
// call CultureInfo.get_CurrentCulture()
pcs->EmitCALL(METHOD__CULTURE_INFO__GET_CURRENT_CULTURE, 0, 1);
// save the current culture
LocalDesc locDescCulture(MscorlibBinder::GetClass(CLASS__CULTURE_INFO));
DWORD dwCultureLocalNum = pcs->NewLocal(locDescCulture);
pcs->EmitSTLOC(dwCultureLocalNum);
// set a new one based on the LCID passed from unmanaged
pcs->EmitLDARG(argIdx);
// call CultureInfo..ctor(lcid)
// call CultureInfo.set_CurrentCulture(culture)
pcs->EmitNEWOBJ(METHOD__CULTURE_INFO__INT_CTOR, 1);
pcs->EmitCALL(METHOD__CULTURE_INFO__SET_CURRENT_CULTURE, 1, 0);
// and restore the current one after the call
m_slIL.SetCleanupNeeded();
ILCodeStream *pcsCleanup = m_slIL.GetCleanupCodeStream();
// call CultureInfo.set_CurrentCulture(original_culture)
pcsCleanup->EmitLDLOC(dwCultureLocalNum);
pcsCleanup->EmitCALL(METHOD__CULTURE_INFO__SET_CURRENT_CULTURE, 1, 0);
}
else
{
if (SF_IsCOMStub(m_dwStubFlags))
{
// We used to get LCID from current thread's culture here. The code
// was replaced by the hardcoded LCID_ENGLISH_US as requested by VSTO.
pcs->EmitLDC(0x0409); // LCID_ENGLISH_US
}
else
{
// call CultureInfo.get_CurrentCulture()
pcs->EmitCALL(METHOD__CULTURE_INFO__GET_CURRENT_CULTURE, 0, 1);
//call CultureInfo.get_LCID(this)
pcs->EmitCALL(METHOD__CULTURE_INFO__GET_ID, 1, 1);
}
}
#else // FEATURE_USE_LCID
if (SF_IsForwardStub(m_dwStubFlags))
{
pcs->EmitLDC(0x0409); // LCID_ENGLISH_US
}
#endif // FEATURE_USE_LCID
// add the extra arg to the unmanaged signature
LocalDesc locDescNative(ELEMENT_TYPE_I4);
pcs->SetStubTargetArgType(&locDescNative, false);
if (SF_IsReverseStub(m_dwStubFlags))
{
// reverse the effect of SetStubTargetArgType on the stack delta
// (the LCID argument is explicitly passed from unmanaged but does not
// show up in the managed signature in any way)
m_slIL.AdjustTargetStackDeltaForExtraParam();
}
}
void SwapStubSignatures(MethodDesc* pStubMD)
{
STANDARD_VM_CONTRACT;
//
// Since the stub handles native-to-managed transitions, we have to swap the
// stub-state-calculated stub target sig with the stub sig itself. This is
// because the stub target sig represents the native signature and the stub
// sig represents the managed signature.
//
// The first step is to convert the managed signature to a module-independent
// signature and then pass it off to SetStubTargetMethodSig. Note that the
// ILStubResolver will copy the sig, so we only need to make a temporary copy
// of it.
//
SigBuilder sigBuilder;
{
SigPointer sigPtr(pStubMD->GetSig());
sigPtr.ConvertToInternalSignature(pStubMD->GetModule(), NULL, &sigBuilder);
}
//
// The second step is to reset the sig on the stub MethodDesc to be the
// stub-state-calculated stub target sig.
//
{
//
// make a domain-local copy of the sig so that this state can outlive the
// compile time state.
//
DWORD cbNewSig;
PCCOR_SIGNATURE pNewSig;
cbNewSig = GetStubTargetMethodSigLength();
pNewSig = (PCCOR_SIGNATURE)(void *)pStubMD->GetLoaderAllocator()->GetHighFrequencyHeap()->AllocMem(S_SIZE_T(cbNewSig));
memcpyNoGCRefs((void *)pNewSig, GetStubTargetMethodSig(), cbNewSig);
pStubMD->AsDynamicMethodDesc()->SetStoredMethodSig(pNewSig, cbNewSig);
SigPointer sigPtr(pNewSig, cbNewSig);
ULONG callConvInfo;
IfFailThrow(sigPtr.GetCallingConvInfo(&callConvInfo));
if (callConvInfo & CORINFO_CALLCONV_HASTHIS)
{
((PTR_DynamicMethodDesc)pStubMD)->m_dwExtendedFlags &= ~mdStatic;
pStubMD->ClearStatic();
}
else
{
((PTR_DynamicMethodDesc)pStubMD)->m_dwExtendedFlags |= mdStatic;
pStubMD->SetStatic();
}
#ifndef _TARGET_X86_
// we store the real managed argument stack size in the stub MethodDesc on non-X86
UINT stackSize = pStubMD->SizeOfNativeArgStack();
if (!FitsInU2(stackSize))
COMPlusThrow(kMarshalDirectiveException, IDS_EE_SIGTOOCOMPLEX);
pStubMD->AsDynamicMethodDesc()->SetNativeStackArgSize(static_cast<WORD>(stackSize));
#endif // _TARGET_X86_
}
DWORD cbTempModuleIndependentSigLength;
BYTE * pTempModuleIndependentSig = (BYTE *)sigBuilder.GetSignature(&cbTempModuleIndependentSigLength);
// Finish it
SetStubTargetMethodSig(pTempModuleIndependentSig,
cbTempModuleIndependentSigLength);
}
void EmitInvokeTarget(MethodDesc *pStubMD)
{
STANDARD_VM_CONTRACT;
m_slIL.DoNDirect(m_slIL.GetDispatchCodeStream(), m_dwStubFlags, pStubMD);
}
#ifdef FEATURE_COMINTEROP
void EmitExceptionHandler(LocalDesc* pNativeReturnType, LocalDesc* pManagedReturnType,
ILCodeLabel** ppTryEndAndCatchBeginLabel, ILCodeLabel ** ppCatchEndAndReturnLabel)
{
STANDARD_VM_CONTRACT;
ILCodeStream* pcsExceptionHandler = m_slIL.NewCodeStream(ILStubLinker::kExceptionHandler);
*ppTryEndAndCatchBeginLabel = pcsExceptionHandler->NewCodeLabel();
*ppCatchEndAndReturnLabel = pcsExceptionHandler->NewCodeLabel();
pcsExceptionHandler->EmitLEAVE(*ppCatchEndAndReturnLabel);
pcsExceptionHandler->EmitLabel(*ppTryEndAndCatchBeginLabel);
BYTE nativeReturnElemType = pNativeReturnType->ElementType[0]; // return type of the stub
BYTE managedReturnElemType = pManagedReturnType->ElementType[0]; // return type of the mananged target
bool returnTheHRESULT = SF_IsHRESULTSwapping(m_dwStubFlags) ||
(managedReturnElemType == ELEMENT_TYPE_I4) ||
(managedReturnElemType == ELEMENT_TYPE_U4);
#ifdef MDA_SUPPORTED
if (!returnTheHRESULT)
{
MdaExceptionSwallowedOnCallFromCom* mda = MDA_GET_ASSISTANT(ExceptionSwallowedOnCallFromCom);
if (mda)
{
// on the stack: exception object, but the stub linker doesn't know it
pcsExceptionHandler->EmitCALL(METHOD__STUBHELPERS__GET_STUB_CONTEXT, 0, 1);
pcsExceptionHandler->EmitCALL(METHOD__STUBHELPERS__TRIGGER_EXCEPTION_SWALLOWED_MDA,
1, // WARNING: This method takes 2 input args, the exception object and the stub context.
// But the ILStubLinker has no knowledge that the exception object is on the
// stack (because it is unaware that we've just entered a catch block), so we
// lie and claim that we only take one input argument.
1); // returns the exception object back
}
}
#endif // MDA_SUPPORTED
DWORD retvalLocalNum = m_slIL.GetReturnValueLocalNum();
BinderMethodID getHRForException;
if (SF_IsWinRTStub(m_dwStubFlags))
{
getHRForException = METHOD__WINDOWSRUNTIMEMARSHAL__GET_HR_FOR_EXCEPTION;
}
else
{
getHRForException = METHOD__MARSHAL__GET_HR_FOR_EXCEPTION;
}
pcsExceptionHandler->EmitCALL(getHRForException,
0, // WARNING: This method takes 1 input arg, the exception object. But the ILStubLinker
// has no knowledge that the exception object is on the stack (because it is
// unaware that we've just entered a catch block), so we lie and claim that we
// don't take any input arguments.
1);
switch (nativeReturnElemType)
{
default:
UNREACHABLE_MSG("Unexpected element type found on native return type.");
break;
case ELEMENT_TYPE_VOID:
_ASSERTE(retvalLocalNum == (DWORD)-1);
pcsExceptionHandler->EmitPOP();
break;
case ELEMENT_TYPE_I4:
case ELEMENT_TYPE_U4:
{
if (!returnTheHRESULT)
{
pcsExceptionHandler->EmitPOP();
pcsExceptionHandler->EmitLDC(0);
pcsExceptionHandler->EmitCONV_T((CorElementType)nativeReturnElemType);
}
_ASSERTE(retvalLocalNum != (DWORD)-1);
pcsExceptionHandler->EmitSTLOC(retvalLocalNum);
}
break;
case ELEMENT_TYPE_R4:
pcsExceptionHandler->EmitPOP();
pcsExceptionHandler->EmitLDC_R4(CLR_NAN_32);
_ASSERTE(retvalLocalNum != (DWORD)-1);
pcsExceptionHandler->EmitSTLOC(retvalLocalNum);
break;
case ELEMENT_TYPE_R8:
pcsExceptionHandler->EmitPOP();
pcsExceptionHandler->EmitLDC_R8(CLR_NAN_64);
_ASSERTE(retvalLocalNum != (DWORD)-1);
pcsExceptionHandler->EmitSTLOC(retvalLocalNum);
break;
case ELEMENT_TYPE_INTERNAL:
{
TypeHandle returnTypeHnd = pNativeReturnType->InternalToken;
CONSISTENCY_CHECK(returnTypeHnd.IsValueType());
_ASSERTE(retvalLocalNum != (DWORD)-1);
pcsExceptionHandler->EmitLDLOCA(retvalLocalNum);
pcsExceptionHandler->EmitINITOBJ(m_slIL.GetDispatchCodeStream()->GetToken(returnTypeHnd));
}
break;
case ELEMENT_TYPE_BOOLEAN:
case ELEMENT_TYPE_CHAR:
case ELEMENT_TYPE_I1:
case ELEMENT_TYPE_U1:
case ELEMENT_TYPE_I2:
case ELEMENT_TYPE_U2:
case ELEMENT_TYPE_I8:
case ELEMENT_TYPE_U8:
case ELEMENT_TYPE_I:
case ELEMENT_TYPE_U:
pcsExceptionHandler->EmitPOP();
pcsExceptionHandler->EmitLDC(0);
pcsExceptionHandler->EmitCONV_T((CorElementType)nativeReturnElemType);
_ASSERTE(retvalLocalNum != (DWORD)-1);
pcsExceptionHandler->EmitSTLOC(retvalLocalNum);
break;
}
pcsExceptionHandler->EmitLEAVE(*ppCatchEndAndReturnLabel);
pcsExceptionHandler->EmitLabel(*ppCatchEndAndReturnLabel);
if (nativeReturnElemType != ELEMENT_TYPE_VOID)
{
_ASSERTE(retvalLocalNum != (DWORD)-1);
pcsExceptionHandler->EmitLDLOC(retvalLocalNum);
}
pcsExceptionHandler->EmitRET();
}
#endif // FEATURE_COMINTEROP
void FinishEmit(MethodDesc* pStubMD)
{
STANDARD_VM_CONTRACT;
ILCodeStream* pcsMarshal = m_slIL.GetMarshalCodeStream();
ILCodeStream* pcsUnmarshal = m_slIL.GetUnmarshalCodeStream();
ILCodeStream* pcsDispatch = m_slIL.GetDispatchCodeStream();
if (SF_IsHRESULTSwapping(m_dwStubFlags) && m_slIL.StubHasVoidReturnType())
{
// if the return type is void, but we're doing HRESULT swapping, we
// need to set the return type here. Otherwise, the return value
// marshaler will do this.
pcsMarshal->SetStubTargetReturnType(ELEMENT_TYPE_I4); // HRESULT
if (SF_IsReverseStub(m_dwStubFlags))
{
// reverse interop needs to seed the return value if the
// managed function returns void but we're doing hresult
// swapping.
pcsUnmarshal->EmitLDC(S_OK);
}
}
LocalDesc nativeReturnType;
LocalDesc managedReturnType;
bool hasTryCatchForHRESULT = SF_IsReverseCOMStub(m_dwStubFlags)
&& !SF_IsFieldGetterStub(m_dwStubFlags)
&& !SF_IsFieldSetterStub(m_dwStubFlags);
#ifdef FEATURE_COMINTEROP
if (hasTryCatchForHRESULT)
{
m_slIL.GetStubTargetReturnType(&nativeReturnType);
m_slIL.GetStubReturnType(&managedReturnType);
}
#endif // FEATURE_COMINTEROP
if (SF_IsHRESULTSwapping(m_dwStubFlags) && SF_IsReverseStub(m_dwStubFlags))
{
m_slIL.AdjustTargetStackDeltaForReverseInteropHRESULTSwapping();
}
if (SF_IsForwardCOMStub(m_dwStubFlags))
{
// Compensate for the 'this' parameter.
m_slIL.AdjustTargetStackDeltaForExtraParam();
}
// Don't touch target signatures from this point on otherwise it messes up the
// cache in ILStubState::GetStubTargetMethodSig.
#ifdef _DEBUG
{
// The native and local signatures should not have any tokens.
// All token references should have been converted to
// ELEMENT_TYPE_INTERNAL.
//
// Note that MetaSig::GetReturnType and NextArg will normalize
// ELEMENT_TYPE_INTERNAL back to CLASS or VALUETYPE.
//
// <TODO> need to recursively check ELEMENT_TYPE_FNPTR signatures </TODO>
SigTypeContext typeContext; // this is an empty type context: COM calls are guaranteed to not be generics.
MetaSig nsig(
GetStubTargetMethodSig(),
GetStubTargetMethodSigLength(),
MscorlibBinder::GetModule(),
&typeContext);
CorElementType type;
IfFailThrow(nsig.GetReturnProps().PeekElemType(&type));
CONSISTENCY_CHECK(ELEMENT_TYPE_CLASS != type && ELEMENT_TYPE_VALUETYPE != type);
while (ELEMENT_TYPE_END != (type = nsig.NextArg()))
{
IfFailThrow(nsig.GetArgProps().PeekElemType(&type));
CONSISTENCY_CHECK(ELEMENT_TYPE_CLASS != type && ELEMENT_TYPE_VALUETYPE != type);
}
}
#endif // _DEBUG
#ifdef FEATURE_COMINTEROP
if (SF_IsForwardCOMStub(m_dwStubFlags))
{
#if defined(MDA_SUPPORTED)
// We won't use this NGEN'ed stub if RaceOnRCWCleanup is enabled at run-time
if (!SF_IsNGENedStub(m_dwStubFlags))
{
// This code may change the type of the frame we use, so it has to be run before the code below where we
// retrieve the stack arg size based on the frame type.
MdaRaceOnRCWCleanup* mda = MDA_GET_ASSISTANT(RaceOnRCWCleanup);
if (mda)
{
// Here we have to register the RCW of the "this" object to the RCWStack and schedule the clean-up for it.
// Emit a call to StubHelpers::StubRegisterRCW() and StubHelpers::StubUnregisterRCW() to do this.
m_slIL.EmitLoadRCWThis(pcsMarshal, m_dwStubFlags);
pcsMarshal->EmitCALL(METHOD__STUBHELPERS__STUB_REGISTER_RCW, 1, 0);
// We use an extra local to track whether we need to unregister the RCW on cleanup
ILCodeStream *pcsSetup = m_slIL.GetSetupCodeStream();
DWORD dwRCWRegisteredLocalNum = pcsSetup->NewLocal(ELEMENT_TYPE_BOOLEAN);
pcsSetup->EmitLDC(0);
pcsSetup->EmitSTLOC(dwRCWRegisteredLocalNum);
pcsMarshal->EmitLDC(1);
pcsMarshal->EmitSTLOC(dwRCWRegisteredLocalNum);
ILCodeStream *pcsCleanup = m_slIL.GetCleanupCodeStream();
ILCodeLabel *pSkipCleanupLabel = pcsCleanup->NewCodeLabel();
m_slIL.SetCleanupNeeded();
pcsCleanup->EmitLDLOC(dwRCWRegisteredLocalNum);
pcsCleanup->EmitBRFALSE(pSkipCleanupLabel);
m_slIL.EmitLoadRCWThis(pcsCleanup, m_dwStubFlags);
pcsCleanup->EmitCALL(METHOD__STUBHELPERS__STUB_UNREGISTER_RCW, 1, 0);
pcsCleanup->EmitLabel(pSkipCleanupLabel);
}
}
#endif // MDA_SUPPORTED
}
#endif // FEATURE_COMINTEROP
// <NOTE>
// The profiler helpers below must be called immediately before and after the call to the target.
// The debugger trace call helpers are invoked from StubRareDisableWorker
// </NOTE>
#if defined(PROFILING_SUPPORTED)
DWORD dwMethodDescLocalNum = (DWORD)-1;
// Notify the profiler of call out of the runtime
if (!SF_IsReverseCOMStub(m_dwStubFlags) && (CORProfilerTrackTransitions() || SF_IsNGENedStubForProfiling(m_dwStubFlags)))
{
dwMethodDescLocalNum = m_slIL.EmitProfilerBeginTransitionCallback(pcsDispatch, m_dwStubFlags);
_ASSERTE(dwMethodDescLocalNum != (DWORD)-1);
}
#endif // PROFILING_SUPPORTED
#ifdef MDA_SUPPORTED
if (SF_IsForwardStub(m_dwStubFlags) && !SF_IsNGENedStub(m_dwStubFlags) &&
MDA_GET_ASSISTANT(GcManagedToUnmanaged))
{
m_slIL.EmitCallGcCollectForMDA(pcsDispatch, m_dwStubFlags);
}
#endif // MDA_SUPPORTED
// For CoreClr, clear the last error before calling the target that returns last error.
// There isn't always a way to know the function have failed without checking last error,
// in particular on Unix.
if (m_fSetLastError && SF_IsForwardStub(m_dwStubFlags))
{
pcsDispatch->EmitCALL(METHOD__STUBHELPERS__CLEAR_LAST_ERROR, 0, 0);
}
// Invoke the target (calli, call method, call delegate, get/set field, etc.)
EmitInvokeTarget(pStubMD);
// Saving last error must be the first thing we do after returning from the target
if (m_fSetLastError && SF_IsForwardStub(m_dwStubFlags))
{
pcsDispatch->EmitCALL(METHOD__STUBHELPERS__SET_LAST_ERROR, 0, 0);
}
#if defined(_TARGET_X86_)
if (SF_IsForwardDelegateStub(m_dwStubFlags))
{
// the delegate may have an intercept stub attached to its sync block so we should
// prevent it from being garbage collected when the call is in progress
pcsDispatch->EmitLoadThis();
pcsDispatch->EmitCALL(METHOD__GC__KEEP_ALIVE, 1, 0);
}
#endif // defined(_TARGET_X86_)
#ifdef MDA_SUPPORTED
if (SF_IsForwardStub(m_dwStubFlags) && !SF_IsNGENedStub(m_dwStubFlags) &&
MDA_GET_ASSISTANT(GcUnmanagedToManaged))
{
m_slIL.EmitCallGcCollectForMDA(pcsDispatch, m_dwStubFlags);
}
#endif // MDA_SUPPORTED
#ifdef VERIFY_HEAP
if (SF_IsForwardStub(m_dwStubFlags) && g_pConfig->InteropValidatePinnedObjects())
{
// call StubHelpers.ValidateObject/StubHelpers.ValidateByref on pinned locals
m_slIL.EmitObjectValidation(pcsDispatch, m_dwStubFlags);
}
#endif // VERIFY_HEAP
#if defined(PROFILING_SUPPORTED)
// Notify the profiler of return back into the runtime
if (dwMethodDescLocalNum != (DWORD)-1)
{
m_slIL.EmitProfilerEndTransitionCallback(pcsDispatch, m_dwStubFlags, dwMethodDescLocalNum);
}
#endif // PROFILING_SUPPORTED
#ifdef FEATURE_COMINTEROP
if (SF_IsForwardCOMStub(m_dwStubFlags))
{
// Make sure that the RCW stays alive for the duration of the call. Note that if we do HRESULT
// swapping, we'll pass 'this' to GetCOMHRExceptionObject after returning from the target so
// GC.KeepAlive is not necessary.
if (!SF_IsHRESULTSwapping(m_dwStubFlags))
{
m_slIL.EmitLoadRCWThis(pcsDispatch, m_dwStubFlags);
pcsDispatch->EmitCALL(METHOD__GC__KEEP_ALIVE, 1, 0);
}
}
#endif // FEATURE_COMINTEROP
if (SF_IsHRESULTSwapping(m_dwStubFlags))
{
if (SF_IsForwardStub(m_dwStubFlags))
{
ILCodeLabel* pSkipThrowLabel = pcsDispatch->NewCodeLabel();
pcsDispatch->EmitDUP();
pcsDispatch->EmitLDC(0);
pcsDispatch->EmitBGE(pSkipThrowLabel);
#ifdef FEATURE_COMINTEROP
if (SF_IsCOMStub(m_dwStubFlags))
{
m_slIL.EmitLoadStubContext(pcsDispatch, m_dwStubFlags);
m_slIL.EmitLoadRCWThis(pcsDispatch, m_dwStubFlags);
if (SF_IsWinRTStub(m_dwStubFlags))
{
pcsDispatch->EmitCALL(METHOD__STUBHELPERS__GET_COM_HR_EXCEPTION_OBJECT_WINRT, 3, 1);
}
else
{
pcsDispatch->EmitCALL(METHOD__STUBHELPERS__GET_COM_HR_EXCEPTION_OBJECT, 3, 1);
}
}
else
#endif // FEATURE_COMINTEROP
{
pcsDispatch->EmitCALL(METHOD__STUBHELPERS__GET_HR_EXCEPTION_OBJECT, 1, 1);
}
pcsDispatch->EmitTHROW();
pcsDispatch->EmitLDC(0); // keep the IL stack balanced across the branch and the fall-through
pcsDispatch->EmitLabel(pSkipThrowLabel);
pcsDispatch->EmitPOP();
}
}
m_slIL.End(m_dwStubFlags);
if (!hasTryCatchForHRESULT) // we will 'leave' the try scope and then 'ret' from outside
{
pcsUnmarshal->EmitRET();
}
CORJIT_FLAGS jitFlags(CORJIT_FLAGS::CORJIT_FLAG_IL_STUB);
if (m_slIL.HasInteropParamExceptionInfo())
{