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comtoclrcall.cpp
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comtoclrcall.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.
//
// COM to CLR call support.
//
#include "common.h"
#include "vars.hpp"
#include "clrtypes.h"
#include "stublink.h"
#include "excep.h"
#include "comtoclrcall.h"
#include "cgensys.h"
#include "method.hpp"
#include "siginfo.hpp"
#include "comcallablewrapper.h"
#include "field.h"
#include "virtualcallstub.h"
#include "dllimport.h"
#include "mlinfo.h"
#include "dbginterface.h"
#include "sigbuilder.h"
#include "callconvbuilder.hpp"
#include "comdelegate.h"
#include "finalizerthread.h"
#ifdef _DEBUG
#define FORCEINLINE_NONDEBUG
#else
#define FORCEINLINE_NONDEBUG FORCEINLINE
#endif
#if !defined(DACCESS_COMPILE)
#ifdef TARGET_X86
static PCODE g_pGenericComCallStubFields = NULL;
static PCODE g_pGenericComCallStub = NULL;
#endif
UINT64 FieldCallWorker(Thread *pThread, ComMethodFrame* pFrame);
void FieldCallWorkerDebuggerWrapper(Thread *pThread, ComMethodFrame* pFrame);
void FieldCallWorkerBody(Thread *pThread, ComMethodFrame* pFrame);
//---------------------------------------------------------
// void SetupGenericStubs()
//
// Throws on failure
//---------------------------------------------------------
static void SetupGenericStubs()
{
STANDARD_VM_CONTRACT;
#ifdef TARGET_X86
if ( (g_pGenericComCallStubFields != NULL) && (g_pGenericComCallStub != NULL))
return;
StubHolder<Stub> candidateCall, candidateFields;
// Build each one. If we get a collision on replacement, favor the one that's
// already there. (We have lifetime issues with these, because they are used
// in every VTable without refcounting, so we don't want them to change
// underneath us).
// Allocate all three before setting - if an error occurs, we'll free the
// memory via holder objects and throw.
candidateCall = ComCall::CreateGenericComCallStub(FALSE/*notField*/);
candidateFields = ComCall::CreateGenericComCallStub(TRUE/*Field*/);
if (InterlockedCompareExchangeT<PCODE>(&g_pGenericComCallStub, candidateCall->GetEntryPoint(), 0) == 0)
candidateCall.SuppressRelease();
if (InterlockedCompareExchangeT<PCODE>(&g_pGenericComCallStubFields, candidateFields->GetEntryPoint(), 0) == 0)
candidateFields.SuppressRelease();
#endif // TARGET_X86
}
#ifdef PROFILING_SUPPORTED
// The sole purpose of this helper is to transition into preemptive mode
// and then call the profiler transition callbacks. We can't use the GCX_PREEMP
// in a function with SEH (such as COMToCLRWorkerBody()).
NOINLINE
void ProfilerTransitionCallbackHelper(MethodDesc* pMD, Thread* pThread, COR_PRF_TRANSITION_REASON reason)
{
CONTRACTL
{
NOTHROW;
GC_TRIGGERS;
MODE_ANY;
PRECONDITION(CheckPointer(pMD));
PRECONDITION(CheckPointer(pThread));
PRECONDITION(CORProfilerTrackTransitions());
}
CONTRACTL_END;
GCX_PREEMP_THREAD_EXISTS(pThread);
if (reason == COR_PRF_TRANSITION_CALL)
{
ProfilerUnmanagedToManagedTransitionMD(pMD, COR_PRF_TRANSITION_CALL);
}
else
{
ProfilerManagedToUnmanagedTransitionMD(pMD, COR_PRF_TRANSITION_RETURN);
}
}
#endif // PROFILING_SUPPORTED
// Disable when calling into managed code from a place that fails via HRESULT
extern "C" HRESULT STDCALL StubRareDisableHRWorker(Thread *pThread)
{
STATIC_CONTRACT_NOTHROW;
STATIC_CONTRACT_GC_TRIGGERS;
HRESULT hr = S_OK;
// Do not add a CONTRACT here. We haven't set up SEH. We rely
// on HandleThreadAbort dealing with this situation properly.
// WARNING!!!!
// when we start executing here, we are actually in cooperative mode. But we
// haven't synchronized with the barrier to reentry yet. So we are in a highly
// dangerous mode. If we call managed code, we will potentially be active in
// the GC heap, even as GC's are occurring!
// We must do the following in this order, because otherwise we would be constructing
// the exception for the abort without synchronizing with the GC. Also, we have no
// CLR SEH set up, despite the fact that we may throw a ThreadAbortException.
pThread->RareDisablePreemptiveGC();
EX_TRY
{
pThread->HandleThreadAbort();
}
EX_CATCH
{
hr = GET_EXCEPTION()->GetHR();
}
EX_END_CATCH(SwallowAllExceptions);
// should always be in coop mode here
_ASSERTE(pThread->PreemptiveGCDisabled());
// Note that this code does not handle rare signatures that do not return HRESULT properly
return hr;
}
#ifdef TARGET_X86
// defined in i386\asmhelpers.asm
extern "C" ARG_SLOT __fastcall COMToCLRDispatchHelper(
INT_PTR dwArgECX,
INT_PTR dwArgEDX,
PCODE pTarget,
PCODE pSecretArg,
INT_PTR *pInputStack,
WORD wOutputStackSlots,
UINT16 *pOutputStackOffsets,
Frame *pCurFrame);
inline static void InvokeStub(ComCallMethodDesc *pCMD, PCODE pManagedTarget, OBJECTREF orThis, ComMethodFrame *pFrame, Thread *pThread,
UINT64* pRetValOut)
{
LIMITED_METHOD_CONTRACT;
INT_PTR *pInputStack = (INT_PTR *)pFrame->GetPointerToArguments();
PCODE pStubEntryPoint = pCMD->GetILStub();
INT_PTR EDX = (pCMD->m_wSourceSlotEDX == (UINT16)-1 ? NULL : pInputStack[pCMD->m_wSourceSlotEDX]);
ARG_SLOT retVal = 0;
// Managed code is generally "THROWS" and we have no exception handler here that the contract system can
// see. We ensure that we don't get exceptions here by generating a try/catch in the IL stub that covers
// any possible throw points, including all calls within the stub to helpers.
PERMANENT_CONTRACT_VIOLATION(ThrowsViolation, ReasonILStubWillNotThrow);
//
// NOTE! We do not use BEGIN_CALL_TO_MANAGEDEX around this call because COMToCLRDispatchHelper is
// responsible for pushing/popping the CPFH into the FS:0 chain.
//
*pRetValOut = COMToCLRDispatchHelper(
*((INT_PTR *) &orThis), // pArgECX
EDX, // pArgEDX
pStubEntryPoint, // pTarget
pManagedTarget, // pSecretArg
pInputStack, // pInputStack
pCMD->m_wStubStackSlotCount, // wOutputStackSlots
pCMD->m_pwStubStackSlotOffsets, // pOutputStackOffsets
pThread->GetFrame()); // pCurFrame
}
#else // TARGET_X86
// defined in amd64\GenericComCallStubs.asm
extern "C" ARG_SLOT COMToCLRDispatchHelper(
DWORD dwStackSlots,
ComMethodFrame *pFrame,
PCODE pTarget,
PCODE pR10,
INT_PTR pDangerousThis);
inline static void InvokeStub(ComCallMethodDesc *pCMD, PCODE pManagedTarget, OBJECTREF orThis, ComMethodFrame *pFrame, Thread *pThread,
UINT64* pRetValOut)
{
WRAPPER_NO_CONTRACT;
ARG_SLOT retVal = 0;
PCODE pStubEntryPoint = pCMD->GetILStub();
INT_PTR dangerousThis;
*(OBJECTREF *)&dangerousThis = orThis;
DWORD dwStackSlots = pCMD->GetNumStackBytes() / TARGET_POINTER_SIZE;
// Managed code is generally "THROWS" and we have no exception handler here that the contract system can
// see. We ensure that we don't get exceptions here by generating a try/catch in the IL stub that covers
// any possible throw points, including all calls within the stub to helpers.
PERMANENT_CONTRACT_VIOLATION(ThrowsViolation, ReasonILStubWillNotThrow);
//
// NOTE! We do not use BEGIN_CALL_TO_MANAGEDEX around this call because we stayed in the SO_TOLERANT
// mode and we have no need to push/pop FS:0 on non-x86 Windows platforms.
//
*pRetValOut = COMToCLRDispatchHelper(
dwStackSlots, // dwStackSlots
pFrame, // pFrame
pStubEntryPoint, // pTarget
pManagedTarget, // pSecretArg
dangerousThis); // pDangerousThis
}
#endif // TARGET_X86
#if defined(_MSC_VER) && !defined(_DEBUG)
#pragma optimize("t", on) // optimize for speed
#endif
OBJECTREF COMToCLRGetObjectAndTarget_Delegate(ComCallWrapper * pWrap, PCODE * ppManagedTargetOut)
{
CONTRACTL
{
NOTHROW;
GC_TRIGGERS;
MODE_COOPERATIVE;
}
CONTRACTL_END;
DELEGATEREF pDelObj = (DELEGATEREF)pWrap->GetObjectRef();
_ASSERTE(pDelObj->GetMethodTable()->IsDelegate());
// We don't have to go through the Invoke slot because we know what the delegate
// target is. This is the same optimization that reverse P/Invoke stubs do.
*ppManagedTargetOut = (PCODE)pDelObj->GetMethodPtr();
return pDelObj->GetTarget();
}
FORCEINLINE_NONDEBUG
OBJECTREF COMToCLRGetObjectAndTarget_Virtual(ComCallWrapper * pWrap, MethodDesc * pRealMD, ComCallMethodDesc * pCMD, PCODE * ppManagedTargetOut)
{
CONTRACTL
{
NOTHROW;
GC_TRIGGERS;
MODE_COOPERATIVE;
}
CONTRACTL_END;
OBJECTREF pObject = pWrap->GetObjectRef();
MethodTable *pMT = pObject->GetMethodTable();
if (pRealMD->IsInterface())
{
// For transparent proxies, we need to call on the interface method desc if
// this method represents an interface method and not an IClassX method.
*ppManagedTargetOut = pCMD->GetCallMethodDesc()->GetSingleCallableAddrOfCode();
}
else
{
// we know the slot number for this method desc, grab the actual
// address from the vtable for this slot. The slot number should
// remain the same through out the hierarchy.
*ppManagedTargetOut = pMT->GetSlotForVirtual(pCMD->GetSlot());
}
return pObject;
}
FORCEINLINE_NONDEBUG
OBJECTREF COMToCLRGetObjectAndTarget_NonVirtual(ComCallWrapper * pWrap, MethodDesc * pRealMD, ComCallMethodDesc * pCMD, PCODE * ppManagedTargetOut)
{
CONTRACTL
{
NOTHROW;
GC_TRIGGERS;
MODE_COOPERATIVE;
}
CONTRACTL_END;
//NOTE: No need to optimize for stub dispatch since non-virtuals are retrieved quickly.
*ppManagedTargetOut = pRealMD->GetSingleCallableAddrOfCode();
return pWrap->GetObjectRef();
}
FORCEINLINE_NONDEBUG
void COMToCLRInvokeTarget(PCODE pManagedTarget, OBJECTREF pObject, ComCallMethodDesc * pCMD,
ComMethodFrame * pFrame, Thread * pThread, UINT64* pRetValOut)
{
CONTRACTL
{
NOTHROW;
GC_TRIGGERS;
MODE_COOPERATIVE;
}
CONTRACTL_END;
#ifdef DEBUGGING_SUPPORTED
if (CORDebuggerTraceCall())
{
g_pDebugInterface->TraceCall((const BYTE *)pManagedTarget);
}
#endif // DEBUGGING_SUPPORTED
InvokeStub(pCMD, pManagedTarget, pObject, pFrame, pThread, pRetValOut);
}
NOINLINE
void COMToCLRWorkerBody_Rare(Thread * pThread, ComMethodFrame * pFrame, ComCallWrapper * pWrap,
MethodDesc * pRealMD, ComCallMethodDesc * pCMD, DWORD maskedFlags,
UINT64 * pRetValOut)
{
CONTRACTL
{
NOTHROW;
GC_TRIGGERS;
MODE_COOPERATIVE;
}
CONTRACTL_END;
PCODE pManagedTarget;
OBJECTREF pObject;
int fpReturnSize = 0;
if (maskedFlags & enum_NativeR8Retval)
fpReturnSize = 8;
if (maskedFlags & enum_NativeR4Retval)
fpReturnSize = 4;
maskedFlags &= ~(enum_NativeR4Retval|enum_NativeR8Retval);
switch (maskedFlags)
{
case enum_IsDelegateInvoke|enum_IsVirtual:
case enum_IsDelegateInvoke: pObject = COMToCLRGetObjectAndTarget_Delegate(pWrap, &pManagedTarget); break;
case enum_IsVirtual: pObject = COMToCLRGetObjectAndTarget_Virtual(pWrap, pRealMD, pCMD, &pManagedTarget); break;
case 0: pObject = COMToCLRGetObjectAndTarget_NonVirtual(pWrap, pRealMD, pCMD, &pManagedTarget); break;
default: UNREACHABLE();
}
COMToCLRInvokeTarget(pManagedTarget, pObject, pCMD, pFrame, pThread, pRetValOut);
if (fpReturnSize != 0)
getFPReturn(fpReturnSize, (INT64*)pRetValOut);
#if defined(PROFILING_SUPPORTED)
// Notify the profiler of the return out of the runtime.
if (CORProfilerTrackTransitions())
{
ProfilerTransitionCallbackHelper(pRealMD, pThread, COR_PRF_TRANSITION_RETURN);
}
#endif // PROFILING_SUPPORTED
return;
}
// This is the factored out body of COMToCLRWorker.
FORCEINLINE_NONDEBUG
void COMToCLRWorkerBody(
Thread * pThread,
ComMethodFrame * pFrame,
ComCallWrapper * pWrap,
UINT64 * pRetValOut)
{
CONTRACTL
{
NOTHROW;
GC_TRIGGERS;
MODE_COOPERATIVE;
}
CONTRACTL_END;
ComCallMethodDesc* pCMD = pFrame->GetComCallMethodDesc();
MethodDesc *pRealMD = pCMD->GetMethodDesc();
#if defined(PROFILING_SUPPORTED)
// @TODO: PERF: x86: we are making profiler callbacks in the StubLinker stub as well as here.
// The checks for these callbacks add about 5% to the path length, so we should remove these
// callbacks in the next SxS release because they are redundant.
//
// Notify the profiler of the call into the runtime.
// 32-bit does this callback in the stubs before calling into COMToCLRWorker().
BOOL fNotifyProfiler = CORProfilerTrackTransitions();
if (fNotifyProfiler)
{
ProfilerTransitionCallbackHelper(pRealMD, pThread, COR_PRF_TRANSITION_CALL);
}
#endif // PROFILING_SUPPORTED
LOG((LF_STUBS, LL_INFO1000000, "Calling COMToCLRWorker %s::%s \n", pRealMD->m_pszDebugClassName, pRealMD->m_pszDebugMethodName));
//
// In order to find the managed target code address and target object, we need to know
// what scenario we're in. We do this by switching on the flags of interest. We include
// the NeedsSecurityCheck flag in the calculation even though it's really orthogonal so
// that the faster case--where no security check is needed--can be matched immediately.
//
PCODE pManagedTarget;
OBJECTREF pObject;
DWORD mask = (
enum_IsDelegateInvoke |
enum_IsVirtual |
enum_NativeR4Retval |
enum_NativeR8Retval);
DWORD maskedFlags = pCMD->GetFlags() & mask;
switch (maskedFlags)
{
case enum_IsDelegateInvoke|enum_IsVirtual:
case enum_IsDelegateInvoke: pObject = COMToCLRGetObjectAndTarget_Delegate(pWrap, &pManagedTarget); break;
case enum_IsVirtual: pObject = COMToCLRGetObjectAndTarget_Virtual(pWrap, pRealMD, pCMD, &pManagedTarget); break;
case 0: pObject = COMToCLRGetObjectAndTarget_NonVirtual(pWrap, pRealMD, pCMD, &pManagedTarget); break;
default:
COMToCLRWorkerBody_Rare(pThread, pFrame, pWrap, pRealMD, pCMD, maskedFlags, pRetValOut);
return;
}
COMToCLRInvokeTarget(pManagedTarget, pObject, pCMD, pFrame, pThread, pRetValOut);
#if defined(PROFILING_SUPPORTED)
// Notify the profiler of the return out of the runtime.
if (fNotifyProfiler)
{
ProfilerTransitionCallbackHelper(pRealMD, pThread, COR_PRF_TRANSITION_RETURN);
}
#endif // PROFILING_SUPPORTED
return;
}
//------------------------------------------------------------------
// UINT64 __stdcall COMToCLRWorker(Thread *pThread,
// ComMethodFrame* pFrame)
//------------------------------------------------------------------
extern "C" UINT64 __stdcall COMToCLRWorker(Thread *pThread, ComMethodFrame* pFrame)
{
CONTRACTL
{
NOTHROW; // Although CSE can be thrown
GC_TRIGGERS;
#if defined(TARGET_X86)
MODE_COOPERATIVE; // X86 sets up COOP in stublinker-generated stub
#else
// This contract is disabled because user code can illegally reenter here through no fault of the
// CLR (i.e. it's a user code bug), so we shouldn't be popping ASSERT dialogs in those cases. Note
// that this reentrancy check is already done by the stublinker-generated stub on x86, so it's OK
// to leave the MODE_ contract enabled on x86.
DISABLED(MODE_PREEMPTIVE);
#endif
PRECONDITION(CheckPointer(pFrame));
PRECONDITION(CheckPointer(pThread, NULL_OK));
}
CONTRACTL_END;
UINT64 retVal = 0;
ComCallMethodDesc* pCMD = pFrame->GetComCallMethodDesc();
#if !defined(TARGET_X86)
//
// The following code is a transcription of the code that is generated by CreateGenericComCallStub. The
// idea is that we needn't really do this work either in static assembly code nor in dynamically
// generated code since the benefit/cost ratio is low. There are some minor differences in the below
// code, compared to x86.
// We must check each time at runtime here because we're using static code.
//
HRESULT hr = S_OK;
pThread = GetThreadNULLOk();
if (pThread == NULL)
{
pThread = SetupThreadNoThrow();
if (pThread == NULL)
{
hr = E_OUTOFMEMORY;
goto ErrorExit;
}
}
if (pThread->PreemptiveGCDisabled())
{
EEPOLICY_HANDLE_FATAL_ERROR_WITH_MESSAGE(
COR_E_EXECUTIONENGINE,
W("Invalid Program: attempted to call a COM method from managed code."));
}
// Attempt to switch GC modes. Note that this is performed manually just like in the x86 stub because
// we have additional checks for thread abort that are performed only when
// g_TrapReturningThreads is set.
pThread->m_fPreemptiveGCDisabled.StoreWithoutBarrier(1);
if (g_TrapReturningThreads)
{
hr = StubRareDisableHRWorker(pThread);
if (S_OK != hr)
goto ErrorExit;
}
// Initialize the frame's VPTR and GS cookie.
*((TADDR*)pFrame) = ComMethodFrame::GetMethodFrameVPtr();
*pFrame->GetGSCookiePtr() = GetProcessGSCookie();
// Link frame into the chain.
pFrame->Push(pThread);
#endif // !TARGET_X86
_ASSERTE(pThread);
// At this point we should be in preemptive GC mode (regardless of if it happened
// in the stub or in the worker).
_ASSERTE(pThread->PreemptiveGCDisabled());
{
#ifndef TARGET_X86
if (pCMD->IsFieldCall())
{
retVal = FieldCallWorker(pThread, pFrame);
}
else
#endif // !TARGET_X86
{
IUnknown **pip = (IUnknown **)pFrame->GetPointerToArguments();
IUnknown *pUnk = (IUnknown *)*pip;
_ASSERTE(pUnk != NULL);
// Obtain the managed 'this' for the call
ComCallWrapper *pWrap = ComCallWrapper::GetWrapperFromIP(pUnk);
COMToCLRWorkerBody(pThread, pFrame, pWrap, &retVal);
}
}
#ifndef TARGET_X86
// Note: the EH subsystem will handle resetting the frame chain and setting
// the correct GC mode on exception.
pFrame->Pop(pThread);
pThread->EnablePreemptiveGC();
#endif
LOG((LF_STUBS, LL_INFO1000000, "COMToCLRWorker leave\n"));
// The call was successful. If the native return type is a floating point
// value, then we need to set the floating point registers appropriately.
if (pCMD->IsNativeFloatingPointRetVal()) // single check skips both cases
{
if (pCMD->IsNativeR4RetVal())
setFPReturn(4, retVal);
else
setFPReturn(8, retVal);
}
return retVal;
#ifndef TARGET_X86
ErrorExit:
if (pThread != NULL && pThread->PreemptiveGCDisabled())
pThread->EnablePreemptiveGC();
// The call failed so we need to report an error to the caller.
if (pCMD->IsNativeHResultRetVal())
{
_ASSERTE(FAILED(hr));
retVal = hr;
}
else if (pCMD->IsNativeBoolRetVal())
{
retVal = FALSE;
}
else if (pCMD->IsNativeR4RetVal())
{
setFPReturn(4, CLR_NAN_32);
}
else if (pCMD->IsNativeR8RetVal())
{
setFPReturn(8, CLR_NAN_64);
}
else
{
_ASSERTE(pCMD->IsNativeVoidRetVal());
}
return retVal;
#endif // TARGET_X86
}
#if defined(_MSC_VER) && !defined(_DEBUG)
#pragma optimize("", on) // restore settings
#endif
static UINT64 __stdcall FieldCallWorker(Thread *pThread, ComMethodFrame* pFrame)
{
CONTRACTL
{
NOTHROW;
GC_TRIGGERS;
MODE_COOPERATIVE;
ENTRY_POINT;
PRECONDITION(CheckPointer(pThread));
PRECONDITION(CheckPointer(pFrame));
}
CONTRACTL_END;
LOG((LF_STUBS, LL_INFO1000000, "FieldCallWorker enter\n"));
HRESULT hrRetVal = S_OK;
IUnknown** pip = (IUnknown **)pFrame->GetPointerToArguments();
IUnknown* pUnk = (IUnknown *)*pip;
_ASSERTE(pUnk != NULL);
ComCallWrapper* pWrap = ComCallWrapper::GetWrapperFromIP(pUnk);
_ASSERTE(pWrap != NULL);
GCX_ASSERT_COOP();
OBJECTREF pThrowable = NULL;
GCPROTECT_BEGIN(pThrowable);
{
EX_TRY
{
FieldCallWorkerDebuggerWrapper(pThread, pFrame);
}
EX_CATCH
{
pThrowable = GET_THROWABLE();
}
EX_END_CATCH(SwallowAllExceptions);
if (pThrowable != NULL)
{
// Transform the exception into an HRESULT. This also sets up
// an IErrorInfo on the current thread for the exception.
hrRetVal = SetupErrorInfo(pThrowable);
}
}
GCPROTECT_END();
LOG((LF_STUBS, LL_INFO1000000, "FieldCallWorker leave\n"));
return hrRetVal;
}
static void FieldCallWorkerDebuggerWrapper(Thread *pThread, ComMethodFrame* pFrame)
{
// Use static contracts b/c we have SEH.
STATIC_CONTRACT_THROWS;
STATIC_CONTRACT_GC_TRIGGERS;
STATIC_CONTRACT_MODE_ANY;
struct Param : public NotifyOfCHFFilterWrapperParam {
Thread* pThread;
} param;
param.pFrame = pFrame;
param.pThread = pThread;
// @todo - we have a PAL_TRY/PAL_EXCEPT here as a general (cross-platform) way to get a 1st-pass
// filter. If that's bad perf, we could inline an FS:0 handler for x86-only; and then inline
// both this wrapper and the main body.
PAL_TRY(Param *, pParam, ¶m)
{
FieldCallWorkerBody(pParam->pThread, (ComMethodFrame*)pParam->pFrame);
}
PAL_EXCEPT_FILTER(NotifyOfCHFFilterWrapper)
{
// Should never reach here b/c handler should always continue search.
_ASSERTE(false);
}
PAL_ENDTRY
}
static void FieldCallWorkerBody(Thread *pThread, ComMethodFrame* pFrame)
{
CONTRACTL
{
THROWS;
GC_TRIGGERS;
MODE_ANY; // Dependant on machine type (X86 sets COOP in stub)
PRECONDITION(CheckPointer(pThread));
PRECONDITION(CheckPointer(pFrame));
}
CONTRACTL_END;
IUnknown** pip = (IUnknown **)pFrame->GetPointerToArguments();
IUnknown* pUnk = (IUnknown *)*pip;
_ASSERTE(pUnk != NULL);
ComCallWrapper* pWrap = ComCallWrapper::GetWrapperFromIP(pUnk);
_ASSERTE(pWrap != NULL);
ComCallMethodDesc *pCMD = pFrame->GetComCallMethodDesc();
_ASSERTE(pCMD->IsFieldCall());
_ASSERTE(pCMD->IsNativeHResultRetVal());
#ifdef PROFILING_SUPPORTED
// Notify the profiler of the call into the runtime.
// 32-bit does this callback in the stubs before calling into FieldCallWorker().
if (CORProfilerTrackTransitions())
{
MethodDesc* pMD = pCMD->GetMethodDesc();
ProfilerTransitionCallbackHelper(pMD, pThread, COR_PRF_TRANSITION_CALL);
}
#endif // PROFILING_SUPPORTED
UINT64 retVal;
InvokeStub(pCMD, NULL, pWrap->GetObjectRef(), pFrame, pThread, &retVal);
#ifdef PROFILING_SUPPORTED
// Notify the profiler of the return out of the runtime.
if (CORProfilerTrackTransitions())
{
MethodDesc* pMD = pCMD->GetMethodDesc();
ProfilerTransitionCallbackHelper(pMD, pThread, COR_PRF_TRANSITION_RETURN);
}
#endif // PROFILING_SUPPORTED
}
//---------------------------------------------------------
PCODE ComCallMethodDesc::CreateCOMToCLRStub(DWORD dwStubFlags, MethodDesc **ppStubMD)
{
CONTRACT(PCODE)
{
STANDARD_VM_CHECK;
PRECONDITION(CheckPointer(ppStubMD));
POSTCONDITION(CheckPointer(*ppStubMD));
POSTCONDITION(RETVAL != NULL);
}
CONTRACT_END;
MethodDesc * pStubMD;
if (IsFieldCall())
{
FieldDesc *pFD = GetFieldDesc();
pStubMD = ComCall::GetILStubMethodDesc(pFD, dwStubFlags);
}
else
{
// if this represents a ctor or static, use the class method (i.e. the actual ctor or static)
MethodDesc *pMD = GetCallMethodDesc();
pStubMD = ComCall::GetILStubMethodDesc(pMD, dwStubFlags);
}
*ppStubMD = pStubMD;
#ifdef TARGET_X86
// make sure our native stack computation in code:ComCallMethodDesc.InitNativeInfo is right
_ASSERTE(HasMarshalError() || !pStubMD->IsILStub() || pStubMD->AsDynamicMethodDesc()->GetNativeStackArgSize() == m_StackBytes);
#else // TARGET_X86
ExecutableWriterHolder<ComCallMethodDesc> comCallMDWriterHolder(this, sizeof(ComCallMethodDesc));
if (pStubMD->IsILStub())
{
comCallMDWriterHolder.GetRW()->m_StackBytes = pStubMD->AsDynamicMethodDesc()->GetNativeStackArgSize();
_ASSERTE(m_StackBytes == pStubMD->SizeOfArgStack());
}
else
{
UINT size = pStubMD->SizeOfArgStack();
_ASSERTE(size <= USHRT_MAX);
comCallMDWriterHolder.GetRW()->m_StackBytes = (UINT16)size;
}
#endif // TARGET_X86
RETURN JitILStub(pStubMD);
}
//---------------------------------------------------------
void ComCallMethodDesc::InitRuntimeNativeInfo(MethodDesc *pStubMD)
{
CONTRACTL
{
THROWS;
GC_TRIGGERS;
MODE_ANY;
PRECONDITION(CheckPointer(pStubMD));
}
CONTRACTL_END;
#ifdef TARGET_X86
// Parse the stub signature to figure out how we're going to transform the incoming arguments
// into stub arguments (i.e. ECX and possibly EDX get enregisterable args, stack gets reversed).
MetaSig msig(pStubMD);
ArgIterator argit(&msig);
UINT dwArgStack = argit.SizeOfArgStack();
if (!FitsInU2(dwArgStack))
COMPlusThrow(kMarshalDirectiveException, IDS_EE_SIGTOOCOMPLEX);
NewArrayHolder<UINT16> pwStubStackSlotOffsets;
UINT16 *pOutputStack = NULL;
UINT16 wStubStackSlotCount = static_cast<UINT16>(dwArgStack) / TARGET_POINTER_SIZE;
if (wStubStackSlotCount > 0)
{
pwStubStackSlotOffsets = new UINT16[wStubStackSlotCount];
pOutputStack = pwStubStackSlotOffsets + wStubStackSlotCount;
}
UINT16 wSourceSlotEDX = (UINT16)-1;
int numRegistersUsed = 0;
UINT16 wInputStack = 0;
// process this
if (!pStubMD->IsStatic())
{
numRegistersUsed++;
wInputStack += TARGET_POINTER_SIZE;
}
// process the return buffer parameter
if (argit.HasRetBuffArg())
{
numRegistersUsed++;
wSourceSlotEDX = wInputStack / TARGET_POINTER_SIZE;
wInputStack += TARGET_POINTER_SIZE;
}
// process ordinary parameters
for (UINT i = msig.NumFixedArgs(); i > 0; i--)
{
TypeHandle thValueType;
CorElementType type = msig.NextArgNormalized(&thValueType);
UINT cbSize = MetaSig::GetElemSize(type, thValueType);
if (ArgIterator::IsArgumentInRegister(&numRegistersUsed, type, thValueType))
{
wSourceSlotEDX = wInputStack / TARGET_POINTER_SIZE;
wInputStack += TARGET_POINTER_SIZE;
}
else
{
// we may need more stack slots for larger parameters
UINT slotsCount = StackElemSize(cbSize) / TARGET_POINTER_SIZE;
pOutputStack -= slotsCount;
for (UINT slot = 0; slot < slotsCount; slot++)
{
pOutputStack[slot] = wInputStack;
wInputStack += TARGET_POINTER_SIZE;
}
}
}
// write the computed data into this ComCallMethodDesc
ExecutableWriterHolder<ComCallMethodDesc> comCallMDWriterHolder(this, sizeof(ComCallMethodDesc));
comCallMDWriterHolder.GetRW()->m_dwSlotInfo = (wSourceSlotEDX | (wStubStackSlotCount << 16));
if (pwStubStackSlotOffsets != NULL)
{
if (InterlockedCompareExchangeT(&comCallMDWriterHolder.GetRW()->m_pwStubStackSlotOffsets, pwStubStackSlotOffsets.GetValue(), NULL) == NULL)
{
pwStubStackSlotOffsets.SuppressRelease();
}
}
//
// Fill in return thunk with proper native arg size.
//
BYTE *pMethodDescMemoryRX = ((BYTE*)this) + GetOffsetOfReturnThunk();
BYTE *pMethodDescMemoryRW = ((BYTE*)comCallMDWriterHolder.GetRW()) + GetOffsetOfReturnThunk();
//
// encodes a "ret nativeArgSize" to return and
// pop off the args off the stack
//
pMethodDescMemoryRW[0] = 0xc2;
UINT16 nativeArgSize = GetNumStackBytes();
if (!(nativeArgSize < 0x7fff))
COMPlusThrow(kTypeLoadException, IDS_EE_SIGTOOCOMPLEX);
*(SHORT *)&pMethodDescMemoryRW[1] = nativeArgSize;
FlushInstructionCache(GetCurrentProcess(), pMethodDescMemoryRX, sizeof pMethodDescMemoryRX[0] + sizeof(SHORT));
#endif // TARGET_X86
}
void ComCallMethodDesc::InitMethod(MethodDesc *pMD, MethodDesc *pInterfaceMD)
{
CONTRACTL
{
THROWS;
GC_TRIGGERS;
MODE_ANY;
PRECONDITION(CheckPointer(pMD));
}
CONTRACTL_END;
m_flags = pMD->IsVirtual() ? enum_IsVirtual : 0;
m_pMD = pMD;
m_pInterfaceMD = PTR_MethodDesc(pInterfaceMD);
m_pILStub = NULL;
#ifdef TARGET_X86
m_dwSlotInfo = 0;
m_pwStubStackSlotOffsets = NULL;
#endif // TARGET_X86
// Initialize the native type information size of native stack, native retval flags, etc).
InitNativeInfo();
if (pMD->IsEEImpl() && COMDelegate::IsDelegateInvokeMethod(pMD))
{
m_flags |= enum_IsDelegateInvoke;
}
}
void ComCallMethodDesc::InitField(FieldDesc* pFD, BOOL isGetter)
{
CONTRACTL
{
STANDARD_VM_CHECK;
PRECONDITION(CheckPointer(pFD));
}
CONTRACTL_END;
m_pFD = pFD;
m_pILStub = NULL;
#ifdef TARGET_X86
m_dwSlotInfo = 0;
m_pwStubStackSlotOffsets = NULL;
#endif // TARGET_X86
m_flags = enum_IsFieldCall; // mark the attribute as a field
m_flags |= isGetter ? enum_IsGetter : 0;
// Initialize the native type information size of native stack, native retval flags, etc).
InitNativeInfo();
};
// Initialize the member's native type information (size of native stack, native retval flags, etc).
// It is unfortunate that we have to touch all this metadata at creation time. The reason for this
// is that we need to know size of the native stack to be able to return back to unmanaged code in
// case ComPrestub fails. If it fails because the target appdomain has already been unloaded, it is
// too late to make this computation - the metadata is no longer available.
void ComCallMethodDesc::InitNativeInfo()
{
CONTRACT_VOID
{
STANDARD_VM_CHECK;
PRECONDITION(!IsNativeInfoInitialized());
}
CONTRACT_END;
m_StackBytes = (UINT16)-1;
EX_TRY
{
#ifdef TARGET_X86
// On x86, this method has to compute size of arguments because we need to know size of the native stack
// to be able to return back to unmanaged code
UINT16 nativeArgSize;
#endif
if (IsFieldCall())
{
FieldDesc *pFD = GetFieldDesc();
_ASSERTE(pFD != NULL);
#ifdef _DEBUG
LPCUTF8 szDebugName = pFD->GetDebugName();
LPCUTF8 szDebugClassName = pFD->GetEnclosingMethodTable()->GetDebugClassName();
if (g_pConfig->ShouldBreakOnComToClrNativeInfoInit(szDebugName))
CONSISTENCY_CHECK_MSGF(false, ("BreakOnComToClrNativeInfoInit: '%s' ", szDebugName));
#endif // _DEBUG
MetaSig fsig(pFD);
fsig.NextArg();