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Satori/src/coreclr/debug/di/rsclass.cpp
Adeel Mujahid 4141913109
Fix typos (#69011)
2022-05-07 11:55:53 -07:00

1194 lines
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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.
//*****************************************************************************
//
// File: class.cpp
//
//*****************************************************************************
#include "stdafx.h"
// We have an assert in ceemain.cpp that validates this assumption
#define FIELD_OFFSET_NEW_ENC_DB 0x07FFFFFB
#include "winbase.h"
#include "corpriv.h"
//-----------------------------------------------------------------------------
// class CordbClass
// Represents a IL-Class in the debuggee, eg: List<T>, System.Console, etc
//
// Parameters:
// m - module that the class is contained in.
// classMetadataToken - metadata token for the class, scoped to module m.
//-----------------------------------------------------------------------------
CordbClass::CordbClass(CordbModule *m, mdTypeDef classMetadataToken)
: CordbBase(m->GetProcess(), classMetadataToken, enumCordbClass),
m_loadLevel(Constructed),
m_fLoadEventSent(FALSE),
m_fHasBeenUnloaded(false),
m_pModule(m),
m_token(classMetadataToken),
m_fIsValueClassKnown(false),
m_fIsValueClass(false),
m_fHasTypeParams(false),
m_continueCounterLastSync(0),
m_fCustomNotificationsEnabled(false)
{
m_classInfo.Clear();
}
/*
A list of which resources owned by this object are accounted for.
HANDLED:
CordbModule* m_module; // Assigned w/o AddRef()
FieldData *m_fields; // Deleted in ~CordbClass
CordbHangingFieldTable m_hangingFieldsStatic; // by value, ~CHashTableAndData frees
*/
//-----------------------------------------------------------------------------
// Destructor for CordbClass
//-----------------------------------------------------------------------------
CordbClass::~CordbClass()
{
// We should have been explicitly neutered before our internal ref went to 0.
_ASSERTE(IsNeutered());
}
//-----------------------------------------------------------------------------
// Neutered by CordbModule
// See CordbBase::Neuter for semantics.
//-----------------------------------------------------------------------------
void CordbClass::Neuter()
{
// Reduce the reference count on the type object for this class
m_type.Clear();
CordbBase::Neuter();
}
//-----------------------------------------------------------------------------
// Standard IUnknown::QI implementation.
// See IUnknown::QI for standard semantics.
//-----------------------------------------------------------------------------
HRESULT CordbClass::QueryInterface(REFIID id, void **pInterface)
{
if (id == IID_ICorDebugClass)
{
*pInterface = static_cast<ICorDebugClass*>(this);
}
else if (id == IID_ICorDebugClass2)
{
*pInterface = static_cast<ICorDebugClass2*>(this);
}
else if (id == IID_IUnknown)
{
*pInterface = static_cast<IUnknown*>(static_cast<ICorDebugClass*>(this));
}
else
{
*pInterface = NULL;
return E_NOINTERFACE;
}
ExternalAddRef();
return S_OK;
}
//-----------------------------------------------------------------------------
// Get a ICorDebugValue for a static field on this class.
//
// Parameters:
// fieldDef - metadata token for field on this class. Can not be from an
// inherited class.
// pFrame - frame used to resolve Thread-static, AppDomain-static, etc.
// ppValue - OUT: gets value of the field.
//
// Returns:
// S_OK on success.
// CORDBG_E_STATIC_VAR_NOT_AVAILABLE
//-----------------------------------------------------------------------------
HRESULT CordbClass::GetStaticFieldValue(mdFieldDef fieldDef,
ICorDebugFrame *pFrame,
ICorDebugValue **ppValue)
{
PUBLIC_REENTRANT_API_ENTRY(this);
FAIL_IF_NEUTERED(this);
VALIDATE_POINTER_TO_OBJECT(ppValue, ICorDebugValue **);
ATT_REQUIRE_STOPPED_MAY_FAIL(GetProcess());
HRESULT hr = S_OK;
*ppValue = NULL;
BOOL fEnCHangingField = FALSE;
IMetaDataImport * pImport = NULL;
EX_TRY
{
pImport = GetModule()->GetMetaDataImporter(); // throws
// Validate the token.
if (!pImport->IsValidToken(fieldDef) || (TypeFromToken(fieldDef) != mdtFieldDef))
{
ThrowHR(E_INVALIDARG);
}
// Make sure we have enough info about the class.
Init();
// Uninstantiated generics (eg, Foo<T>) don't have static data. Must use instantiated (eg Foo<int>)
// But all CordbClass instances are uninstantiated. So this should fail for all generic types.
// Normally, debuggers should be using ICorDebugType instead.
// Though in the forward compat case, they'll hit this.
if (HasTypeParams())
{
ThrowHR(CORDBG_E_STATIC_VAR_NOT_AVAILABLE);
}
// Lookup the field given its metadata token.
FieldData *pFieldData;
hr = GetFieldInfo(fieldDef, &pFieldData);
// This field was added by EnC, need to use EnC specific code path
if (hr == CORDBG_E_ENC_HANGING_FIELD)
{
// Static fields added with EnC hang off the EnCFieldDesc
hr = GetEnCHangingField(fieldDef,
&pFieldData,
NULL);
if (SUCCEEDED(hr))
{
fEnCHangingField = TRUE;
}
// Note: the FieldOffset in pFieldData has been cooked to produce
// the correct address of the field in the syncBlock.
// @todo: extend Debugger_IPCEFieldData so we don't have to cook the offset here
}
IfFailThrow(hr);
{
Instantiation emptyInst;
hr = CordbClass::GetStaticFieldValue2(GetModule(),
pFieldData,
fEnCHangingField,
&emptyInst,
pFrame,
ppValue);
// Let hr fall through
}
}
EX_CATCH_HRESULT(hr);
// Translate Failure HRs.
if (pImport != NULL)
{
hr = CordbClass::PostProcessUnavailableHRESULT(hr, pImport, fieldDef);
}
return hr;
}
//-----------------------------------------------------------------------------
// Common helper for accessing statics from both CordbClass and CordbType.
//
// Arguments:
// pModule - module containing the class
// pFieldData - field data describing the field (this is correlated to a
// mdFieldDef, but has more specific data)
// fEnCHangingField - field storage hangs off the FieldDesc for EnC
// pInst - generic instantiation.
// pFrame - frame used for context for Thread-static, AD-static, etc.
// ppValue - OUT: out parameter to get value.
//
// Returns:
// S_OK on success.
// CORDBG_E_FIELD_NOT_STATIC - if field isn't static.
// CORDBG_E_STATIC_VAR_NOT_AVAILABLE - if field storage is not available.
// Else some other failure.
/* static */
HRESULT CordbClass::GetStaticFieldValue2(CordbModule * pModule,
FieldData * pFieldData,
BOOL fEnCHangingField,
const Instantiation * pInst,
ICorDebugFrame * pFrame,
ICorDebugValue ** ppValue)
{
FAIL_IF_NEUTERED(pModule);
INTERNAL_SYNC_API_ENTRY(pModule->GetProcess());
_ASSERTE((pModule->GetProcess()->GetShim() == NULL) || pModule->GetProcess()->GetSynchronized());
HRESULT hr = S_OK;
if (!pFieldData->m_fFldIsStatic)
{
return CORDBG_E_FIELD_NOT_STATIC;
}
CORDB_ADDRESS pRmtStaticValue = NULL;
CordbProcess * pProcess = pModule->GetProcess();
if (!pFieldData->m_fFldIsTLS)
{
if (pFieldData->m_fFldIsCollectibleStatic)
{
EX_TRY
{
pRmtStaticValue = pProcess->GetDAC()->GetCollectibleTypeStaticAddress(pFieldData->m_vmFieldDesc,
pModule->GetAppDomain()->GetADToken());
}
EX_CATCH_HRESULT(hr);
if(FAILED(hr))
{
return hr;
}
}
else
{
// Statics never move, so we always address them using their absolute address.
_ASSERTE(pFieldData->OkToGetOrSetStaticAddress());
pRmtStaticValue = pFieldData->GetStaticAddress();
}
}
else
{
// We've got a thread local static
if( fEnCHangingField )
{
// fEnCHangingField is set for fields added with EnC which hang off the FieldDesc.
// Thread-local statics cannot be added with EnC, so we shouldn't be here
// if this is an EnC field is thread-local.
_ASSERTE(!pFieldData->m_fFldIsTLS );
}
else
{
if (pFrame == NULL)
{
return E_INVALIDARG;
}
CordbFrame * pRealFrame = CordbFrame::GetCordbFrameFromInterface(pFrame);
_ASSERTE(pRealFrame != NULL);
// Get the thread we are working on
CordbThread * pThread = pRealFrame->m_pThread;
EX_TRY
{
pRmtStaticValue = pProcess->GetDAC()->GetThreadStaticAddress(pFieldData->m_vmFieldDesc,
pThread->m_vmThreadToken);
}
EX_CATCH_HRESULT(hr);
if(FAILED(hr))
{
return hr;
}
}
}
if (pRmtStaticValue == NULL)
{
// type probably wasn't loaded yet.
// The debugger may chose to func-eval the creation of an instance of this type and try again.
return CORDBG_E_STATIC_VAR_NOT_AVAILABLE;
}
SigParser sigParser;
hr = S_OK;
EX_TRY
{
hr = pFieldData->GetFieldSignature(pModule, &sigParser);
}
EX_CATCH_HRESULT(hr);
IfFailRet(hr);
CordbType * pType;
IfFailRet (CordbType::SigToType(pModule, &sigParser, pInst, &pType));
bool fIsValueClass = false;
EX_TRY
{
fIsValueClass = pType->IsValueType(); // throws
}
EX_CATCH_HRESULT(hr);
IfFailRet(hr);
// Static value classes are stored as handles so that GC can deal with them properly. Thus, we need to follow the
// handle like an objectref. Do this by forcing CreateValueByType to think this is an objectref. Note: we don't do
// this for value classes that have an RVA, since they're layed out at the RVA with no handle.
bool fIsBoxed = (fIsValueClass &&
!pFieldData->m_fFldIsRVA &&
!pFieldData->m_fFldIsPrimitive &&
!pFieldData->m_fFldIsTLS);
TargetBuffer remoteValue(pRmtStaticValue, CordbValue::GetSizeForType(pType, fIsBoxed ? kBoxed : kUnboxed));
ICorDebugValue * pValue = NULL;
EX_TRY
{
CordbValue::CreateValueByType(pModule->GetAppDomain(),
pType,
fIsBoxed,
remoteValue,
MemoryRange(NULL, 0),
NULL,
&pValue); // throws
}
EX_CATCH_HRESULT(hr);
if (SUCCEEDED(hr))
{
*ppValue = pValue;
}
return hr;
}
//-----------------------------------------------------------------------------
// Public method to build a CordbType from a CordbClass.
// This is used to build up generic types. Eg, build:
// List<T> + { int } --> List<int>
//
// Arguments:
// elementType - element type. Either ELEMENT_TYPE_CLASS, or ELEMENT_TYPE_VALUETYPE.
// We could technically figure this out from the metadata (by looking if it derives
// from System.ValueType).
// cTypeArgs - number of elements in rgpTypeArgs array
// rgpTypeArgs - array for type args.
// ppType - OUT: out parameter to hold resulting type.
//
// Returns:
// S_OK on success. Else false.
//
HRESULT CordbClass::GetParameterizedType(CorElementType elementType,
ULONG32 cTypeArgs,
ICorDebugType * rgpTypeArgs[],
ICorDebugType ** ppType)
{
PUBLIC_API_ENTRY(this);
FAIL_IF_NEUTERED(this);
VALIDATE_POINTER_TO_OBJECT(ppType, ICorDebugType **);
ATT_REQUIRE_STOPPED_MAY_FAIL(GetProcess());
// Note: Do not call Init() to find out if its a VC or not.
// Rather expect the client to tell us. This means the debug client
// can describe type instantiations not yet seen in the EE.
if ((elementType != ELEMENT_TYPE_CLASS) && (elementType != ELEMENT_TYPE_VALUETYPE))
{
return E_INVALIDARG;
}
// Prefast overflow check:
S_UINT32 allocSize = S_UINT32( cTypeArgs ) * S_UINT32( sizeof(CordbType *) );
if (allocSize.IsOverflow())
{
return E_INVALIDARG;
}
CordbAppDomain * pClassAppDomain = GetAppDomain();
// Note: casting from (ICorDebugType **) to (CordbType **) is not valid.
// Offsets may differ. Copy and validate the type array.
CordbType ** ppArgTypes = reinterpret_cast<CordbType **>(_alloca( allocSize.Value()));
for (unsigned int i = 0; i < cTypeArgs; i++)
{
ppArgTypes[i] = static_cast<CordbType *>( rgpTypeArgs[i] );
CordbAppDomain * pArgAppDomain = ppArgTypes[i]->GetAppDomain();
if ((pArgAppDomain != NULL) && (pArgAppDomain != pClassAppDomain))
{
return CORDBG_E_APPDOMAIN_MISMATCH;
}
}
{
CordbType * pResultType;
Instantiation typeInstantiation(cTypeArgs, ppArgTypes);
HRESULT hr = CordbType::MkType(pClassAppDomain, elementType, this, &typeInstantiation, &pResultType);
if (FAILED(hr))
{
return hr;
}
*ppType = pResultType;
}
_ASSERTE(*ppType);
if (*ppType)
{
(*ppType)->AddRef();
}
return S_OK;
}
//-----------------------------------------------------------------------------
// Returns true if the field is a static literal.
// In this case, the debugger should get the value from the metadata.
//-----------------------------------------------------------------------------
bool IsFieldStaticLiteral(IMetaDataImport *pImport, mdFieldDef fieldDef)
{
DWORD dwFieldAttr;
HRESULT hr2 = pImport->GetFieldProps(
fieldDef,
NULL,
NULL,
0,
NULL,
&dwFieldAttr,
NULL,
0,
NULL,
NULL,
0);
if (SUCCEEDED(hr2) && IsFdLiteral(dwFieldAttr))
{
return true;
}
return false;
}
//-----------------------------------------------------------------------------
// Filter to determine a more descriptive failing HResult for a field lookup.
//
// Parameters:
// hr - incoming ambiguous HR.
// pImport - metadata importer for this class.
// feildDef - field being looked up.
//
// Returns:
// hr - the incoming HR if no further HR can be determined.
// else another failing HR that it judged to be more specific that the incoming HR.
//-----------------------------------------------------------------------------
HRESULT CordbClass::PostProcessUnavailableHRESULT(HRESULT hr,
IMetaDataImport *pImport,
mdFieldDef fieldDef)
{
CONTRACTL
{
NOTHROW; // just translates an HR. shouldn't need to throw.
}
CONTRACTL_END;
if (hr == CORDBG_E_FIELD_NOT_AVAILABLE)
{
if (IsFieldStaticLiteral(pImport, fieldDef))
{
return CORDBG_E_VARIABLE_IS_ACTUALLY_LITERAL;
}
}
return hr;
}
//-----------------------------------------------------------------------------
// Public method to get the Module that this class lives in.
//
// Parameters:
// ppModule - OUT: holds module that this class gets in.
//
// Returns:
// S_OK on success.
//-----------------------------------------------------------------------------
HRESULT CordbClass::GetModule(ICorDebugModule **ppModule)
{
FAIL_IF_NEUTERED(this);
VALIDATE_POINTER_TO_OBJECT(ppModule, ICorDebugModule **);
*ppModule = static_cast<ICorDebugModule*> (m_pModule);
m_pModule->ExternalAddRef();
return S_OK;
}
//-----------------------------------------------------------------------------
// Get the mdTypeDef token that this class corresponds to.
//
// Parameters:
// pTypeDef - OUT: out param to get typedef token.
//
// Returns:
// S_OK - on success.
//-----------------------------------------------------------------------------
HRESULT CordbClass::GetToken(mdTypeDef *pTypeDef)
{
FAIL_IF_NEUTERED(this);
VALIDATE_POINTER_TO_OBJECT(pTypeDef, mdTypeDef *);
_ASSERTE(TypeFromToken(m_token) == mdtTypeDef);
*pTypeDef = m_token;
return S_OK;
}
//-----------------------------------------------------------------------------
// Set the JMC status on all of our member functions.
// The current implementation just uses the metadata to enumerate all
// methods and then calls SetJMCStatus on each method.
// This isn't great perf, but this should never be needed in a
// perf-critical situation.
//
// Parameters:
// fIsUserCode - true to set entire class to user code. False to set to
// non-user code.
//
// Returns:
// S_OK on success. On failure, the user-code status of the methods in the
// class is random.
//-----------------------------------------------------------------------------
HRESULT CordbClass::SetJMCStatus(BOOL fIsUserCode)
{
PUBLIC_REENTRANT_API_ENTRY(this);
FAIL_IF_NEUTERED(this);
ATT_REQUIRE_STOPPED_MAY_FAIL(GetProcess());
// Get the member functions via a meta data interface
CordbModule * pModule = GetModule();
// Ensure that our process is in a sane state.
CordbProcess * pProcess = pModule->GetProcess();
_ASSERTE(pProcess != NULL);
IMetaDataImport * pImport = NULL;
HCORENUM phEnum = 0;
HRESULT hr = S_OK;
mdMethodDef rTokens[100];
ULONG i;
ULONG count;
EX_TRY
{
pImport = pModule->GetMetaDataImporter();
do
{
hr = pImport->EnumMethods(&phEnum, m_token, rTokens, ARRAY_SIZE(rTokens), &count);
IfFailThrow(hr);
for (i = 0; i < count; i++)
{
RSLockHolder lockHolder(pProcess->GetProcessLock());
// Need the ICorDebugFunction to query for JMC status.
CordbFunction * pFunction = pModule->LookupOrCreateFunctionLatestVersion(rTokens[i]);
lockHolder.Release(); // Must release before sending an IPC event
hr = pFunction->SetJMCStatus(fIsUserCode);
IfFailThrow(hr);
}
}
while (count > 0);
_ASSERTE(SUCCEEDED(hr));
}
EX_CATCH_HRESULT(hr);
if ((pImport != NULL) && (phEnum != 0))
{
pImport->CloseEnum(phEnum);
}
return hr;
}
//-----------------------------------------------------------------------------
// We have to go the EE to find out if a class is a value
// class or not. This is because there is no flag for this, but rather
// it depends on whether the class subclasses System.ValueType (apart
// from System.Enum...). Replicating all that resoultion logic
// does not seem like a good plan.
//
// We also accept other "evidence" that the class is or isn't a VC, in
// particular:
// - It is definitely a VC if it has been used after a
// E_T_VALUETYPE in a signature.
// - It is definitely not a VC if it has been used after a
// E_T_CLASS in a signature.
// - It is definitely a VC if it has been used in combination with
// E_T_VALUETYPE in one of COM API operations that take both
// a ICorDebugClass and a CorElementType (e.g. GetParameterizedType)
//
// !!!Note the following!!!!
// - A class may still be a VC even if it has been
// used in combination with E_T_CLASS in one of COM API operations that take both
// a ICorDebugClass and a CorElementType (e.g. GetParameterizedType).
// We allow the user of the API to specify E_T_CLASS when the VC status
// is not known or is not important.
//
// Return Value:
// indicates whether this is a value-class
//
// Notes:
// Throws CORDBG_E_CLASS_NOT_LOADED or synchronization errors on failure
//-----------------------------------------------------------------------------
bool CordbClass::IsValueClass()
{
INTERNAL_API_ENTRY(this);
THROW_IF_NEUTERED(this);
if (!m_fIsValueClassKnown)
{
ATT_REQUIRE_STOPPED_MAY_FAIL_OR_THROW(GetProcess(), ThrowHR);
Init();
}
return m_fIsValueClass;
}
//-----------------------------------------------------------------------------
// Get a CordbType for the 'this' pointer of a method in a CordbClass.
// The 'this' pointer is argument #0 in an instance method.
//
// For ReferenceTypes (ELEMENT_TYPE_CLASS), the 'this' pointer is just a
// normal reference, and so GetThisType() behaves like GetParameterizedType().
// For ValueTypes, the 'this' pointer is a byref.
//
// Arguments:
// pInst - instantiation info (eg, the type parameters) to produce CordbType
// ppResultType - OUT: out parameter to hold outgoing CordbType.
//
// Returns:
// S_OK on success. Else failure.
//
HRESULT CordbClass::GetThisType(const Instantiation * pInst, CordbType ** ppResultType)
{
FAIL_IF_NEUTERED(this);
HRESULT hr = S_OK;
// Note: We have to call Init() here to find out if it really a VC or not.
bool fIsValueClass = false;
EX_TRY
{
fIsValueClass = IsValueClass();
}
EX_CATCH_HRESULT(hr);
if (FAILED(hr))
{
return hr;
}
if (fIsValueClass)
{
CordbType *pType;
hr = CordbType::MkType(GetAppDomain(), // OK: this E_T_VALUETYPE will be normalized by MkType
ELEMENT_TYPE_VALUETYPE,
this,
pInst,
&pType);
if (!SUCCEEDED(hr))
{
return hr;
}
hr = CordbType::MkType(GetAppDomain(), ELEMENT_TYPE_BYREF, 0, pType, ppResultType);
if (!SUCCEEDED(hr))
{
return hr;
}
}
else
{
hr = CordbType::MkType(GetAppDomain(), ELEMENT_TYPE_CLASS, this, pInst, ppResultType);
if (!SUCCEEDED(hr))
{
return hr;
}
}
return hr;
}
//-----------------------------------------------------------------------------
// Initialize the CordbClass.
// This will collect all the field information via the DAC, and also determine
// whether this Type is a ReferenceType or ValueType.
//
// Parameters:
// fForceInit - if true, always reinitialize. If false, may skip
// initialization if we believe we already have the info.
//
// Note:
// Throws CORDBG_E_CLASS_NOT_LOADED on failure
//-----------------------------------------------------------------------------
void CordbClass::Init(ClassLoadLevel desiredLoadLevel)
{
INTERNAL_SYNC_API_ENTRY(this->GetProcess());
CordbProcess * pProcess = GetProcess();
IDacDbiInterface* pDac = pProcess->GetDAC();
// If we've done a continue since the last time we got hanging static fields,
// we should clear out our cache, since everything may have moved.
if (m_continueCounterLastSync < GetProcess()->m_continueCounter)
{
m_hangingFieldsStatic.Clear();
m_continueCounterLastSync = GetProcess()->m_continueCounter;
}
if (m_loadLevel < desiredLoadLevel)
{
// reset everything
m_loadLevel = Constructed;
m_fIsValueClass = false;
m_fIsValueClassKnown = false;
m_fHasTypeParams = false;
m_classInfo.Clear();
// @dbgtodo Microsoft inspection: declare a constant to replace badbad
m_classInfo.m_objectSize = 0xbadbad;
VMPTR_TypeHandle vmTypeHandle = VMPTR_TypeHandle::NullPtr();
// basic info load level
if(desiredLoadLevel >= BasicInfo)
{
vmTypeHandle = pDac->GetTypeHandle(m_pModule->GetRuntimeModule(), GetToken());
SetIsValueClass(pDac->IsValueType(vmTypeHandle));
m_fHasTypeParams = !!pDac->HasTypeParams(vmTypeHandle);
m_loadLevel = BasicInfo;
}
// full info load level
if(desiredLoadLevel == FullInfo)
{
VMPTR_AppDomain vmAppDomain = VMPTR_AppDomain::NullPtr();
VMPTR_DomainAssembly vmDomainAssembly = m_pModule->GetRuntimeDomainAssembly();
if (!vmDomainAssembly.IsNull())
{
DomainAssemblyInfo info;
pDac->GetDomainAssemblyData(vmDomainAssembly, &info);
vmAppDomain = info.vmAppDomain;
}
pDac->GetClassInfo(vmAppDomain, vmTypeHandle, &m_classInfo);
BOOL fGotUnallocatedStatic = GotUnallocatedStatic(&m_classInfo.m_fieldList);
// if we have an unallocated static don't record that we reached FullInfo stage
// this seems pretty ugly but I don't want to bite off cleaning this up just yet
// Not saving the FullInfo stage effectively means future calls to Init() will
// re-init everything and some parts of DBI may be depending on that re-initialization
// with alternate data in order to operate correctly
if(!fGotUnallocatedStatic)
m_loadLevel = FullInfo;
}
}
} // CordbClass::Init
// determine if any fields for a type are unallocated statics
BOOL CordbClass::GotUnallocatedStatic(DacDbiArrayList<FieldData> * pFieldList)
{
BOOL fGotUnallocatedStatic = FALSE;
unsigned int count = 0;
while ((count < pFieldList->Count()) && !fGotUnallocatedStatic )
{
if ((*pFieldList)[count].OkToGetOrSetStaticAddress() &&
(*pFieldList)[count].GetStaticAddress() == NULL )
{
// The address for a regular static field isn't available yet
// How can this happen? Statics appear to get allocated during domain load.
// There may be some laziness or a race-condition involved.
fGotUnallocatedStatic = TRUE;
}
++count;
}
return fGotUnallocatedStatic;
} // CordbClass::GotUnallocatedStatic
/*
* FieldData::GetFieldSignature
*
* Get the field's full metadata signature. This may be cached, but for dynamic modules we'll always read it from
* the metadata.
*
* Parameters:
* pModule - pointer to the module that contains the field
*
* pSigParser - OUT: the full signature for the field.
*
* Returns:
* HRESULT for success or failure.
*
*/
HRESULT FieldData::GetFieldSignature(CordbModule *pModule,
SigParser *pSigParser)
{
CONTRACTL
{
THROWS;
}
CONTRACTL_END;
INTERNAL_SYNC_API_ENTRY(pModule->GetProcess());
HRESULT hr = S_OK;
IMetaDataImport * pImport = pModule->GetMetaDataImporter(); // throws;
PCCOR_SIGNATURE fieldSignature = NULL;
ULONG size = ((ULONG) -1);
_ASSERTE(pSigParser != NULL);
// If the module is dynamic, there had better not be a cached field signature.
_ASSERTE(!pModule->IsDynamic() || (m_fldSignatureCache == NULL));
// If the field signature cache is null, or if this is a dynamic module, then go read the signature from the
// matadata. We always read from the metadata for dynamic modules because our metadata blob is constantly
// getting deleted and re-allocated. If we kept a pointer to the signature, we'd end up pointing to bad data.
if (m_fldSignatureCache == NULL)
{
// Go to the metadata for all fields: previously the left-side tranferred over
// single-byte signatures as part of the field info. Since the left-side
// goes to the metadata anyway, and we already fetch plenty of other metadata,
// I don't believe that fetching it here instead of transferring it over
// is going to slow things down at all, and
// in any case will not be where the primary optimizations lie...
IfFailRet(pImport->GetFieldProps(m_fldMetadataToken, NULL, NULL, 0, NULL, NULL,
&fieldSignature,
&size,
NULL, NULL, NULL));
// Point past the calling convention
CorCallingConvention conv;
// Move pointer,
BYTE * pOldPtr = (BYTE*) fieldSignature;
conv = (CorCallingConvention) CorSigUncompressData(fieldSignature);
_ASSERTE(conv == IMAGE_CEE_CS_CALLCONV_FIELD);
size -= (ULONG) (((BYTE*) fieldSignature) - pOldPtr); // since we updated filedSignature, adjust size
// Although the pointer will keep updating, the size should be the same. So we assert that.
_ASSERTE((m_fldSignatureCacheSize == 0) || (m_fldSignatureCacheSize == size));
// Cache the value for non-dynamic modules, so this is faster later.
// Since we're caching in a FieldData, we can't store the actual SigParser object.
if (!pModule->IsDynamic())
{
m_fldSignatureCache = fieldSignature;
m_fldSignatureCacheSize = size;
}
}
else
{
// We have a cached value, so return it. Note: we should never have a cached value for a field in a dynamic
// module.
CONSISTENCY_CHECK_MSGF((!pModule->IsDynamic()),
("We should never cache a field signature in a dynamic module! Module=%p This=%p",
pModule, this));
fieldSignature = m_fldSignatureCache;
size = m_fldSignatureCacheSize;
}
_ASSERTE(fieldSignature != NULL);
_ASSERTE(size != ((ULONG) -1));
*pSigParser = SigParser(fieldSignature, size);
return hr;
}
// CordbClass::InitEnCFieldInfo
// Initializes an instance of EnCHangingFieldInfo.
// Arguments:
// input: fStatic - flag to indicate whether the EnC field is static
// pObject - For instance fields, the Object instance containing the sync-block.
// For static fields (if this is being called from GetStaticFieldValue) object is NULL.
// fieldToken - token for the EnC field
// metadataToken - metadata token for this instance of CordbClass
// output: pEncField - the fields of this class will be appropriately initialized
void CordbClass::InitEnCFieldInfo(EnCHangingFieldInfo * pEncField,
BOOL fStatic,
CordbObjectValue * pObject,
mdFieldDef fieldToken,
mdTypeDef classToken)
{
IDacDbiInterface * pInterface = GetProcess()->GetDAC();
if (fStatic)
{
// the field is static, we don't need any additional data
pEncField->Init(VMPTR_Object::NullPtr(), /* vmObject */
NULL, /* offsetToVars */
fieldToken,
ELEMENT_TYPE_MAX,
classToken,
m_pModule->GetRuntimeDomainAssembly());
}
else
{
// This is an instance field, we need to pass a bunch of type information back
_ASSERTE(pObject != NULL);
pEncField->Init(pInterface->GetObject(pObject->m_id), // VMPTR to the object instance of interest.
pObject->GetInfo().objOffsetToVars, // The offset from the beginning of the object
// to the beginning of the fields. Fields added
// with EnC don't actually reside in the object
// (they hang off the sync block instead), so
// this is used to compute the returned field
// offset (fieldData.m_fldInstanceOffset). This
// makes it appear to be an offset from the object.
// Ideally we wouldn't do any of this, and just
// explicitly deal with absolute addresses (instead
// of "offsets") for EnC hanging instance fields.
fieldToken, // Field token for the added field.
pObject->GetInfo().objTypeData.elementType, // An indication of the type of object to which
// we're adding a field (specifically,
// whether it's a value type or a class).
// This is used only for log messages, and could
// be removed.
classToken, // metadata token for the class
m_pModule->GetRuntimeDomainAssembly()); // Domain file for the class
}
} // CordbClass::InitFieldData
// CordbClass::GetEnCFieldFromDac
// Get information via the DAC about a field added with Edit and Continue.
// Arguments:
// input: fStatic - flag to indicate whether the EnC field is static
// pObject - For instance fields, the Object instance containing the sync-block.
// For static fields (if this is being called from GetStaticFieldValue) object is NULL.
// fieldToken - token for the EnC field
// output: pointer to an initialized instance of FieldData that has been added to the appropriate table
// in our cache
FieldData * CordbClass::GetEnCFieldFromDac(BOOL fStatic,
CordbObjectValue * pObject,
mdFieldDef fieldToken)
{
EnCHangingFieldInfo encField;
mdTypeDef metadataToken;
FieldData fieldData,
* pInfo = NULL;
BOOL fDacStatic;
CordbProcess * pProcess = GetModule()->GetProcess();
_ASSERTE(pProcess != NULL);
IfFailThrow(GetToken(&metadataToken));
InitEnCFieldInfo(&encField, fStatic, pObject, fieldToken, metadataToken);
// Go get this particular field.
pProcess->GetDAC()->GetEnCHangingFieldInfo(&encField, &fieldData, &fDacStatic);
_ASSERTE(fStatic == fDacStatic);
// Save the field results in our cache and get a stable pointer to the data
if (fStatic)
{
pInfo = m_hangingFieldsStatic.AddFieldInfo(&fieldData);
}
else
{
pInfo = pObject->GetHangingFieldTable()->AddFieldInfo(&fieldData);
}
// We should have a fresh copy of the data (don't want to return a pointer to data on our stack)
_ASSERTE((void *)pInfo != (void *)&fieldData);
_ASSERTE(pInfo->m_fFldIsStatic == (fStatic == TRUE));
_ASSERTE(pInfo->m_fldMetadataToken == fieldToken);
// Pass a pointer to the data out.
return pInfo;
} // CordbClass::GetEnCFieldFromDac
//-----------------------------------------------------------------------------
// Internal helper to get a FieldData for fields added by EnC after the type
// was loaded. Since object and MethodTable layout has already been fixed,
// such added fields are "hanging" off some other data structure. For instance
// fields, they're stored in a syncblock off the object. For static fields
// they're stored off the EnCFieldDesc.
//
// The caller must have already determined this is a hanging field (i.e.
// GetFieldInfo returned CORDBG_E_ENC_HANGING_FIELDF).
//
// Arguments:
// input: fldToken - field of interest to get.
// pObject - For instance fields, the Object instance containing the sync-block.
// For static fields (if this is being called from GetStaticFieldValue) object is NULL.
// output: ppFieldData - the FieldData matching the fldToken.
//
// Returns:
// S_OK on success, failure code otherwise.
//-----------------------------------------------------------------------------
HRESULT CordbClass::GetEnCHangingField(mdFieldDef fldToken,
FieldData **ppFieldData,
CordbObjectValue * pObject)
{
FAIL_IF_NEUTERED(this);
INTERNAL_SYNC_API_ENTRY(GetProcess());
HRESULT hr = S_OK;
_ASSERTE(pObject == NULL || !pObject->IsNeutered() );
if (HasTypeParams())
{
_ASSERTE(!"EnC hanging field not yet implemented on constructed types!");
return E_FAIL;
}
// This must be a static field if no object was supplied
BOOL fStatic = (pObject == NULL);
// Look for cached field information
FieldData *pInfo = NULL;
if (fStatic)
{
// Static fields should _NOT_ be cleared, since they stick around. Thus
// the separate tables.
pInfo = m_hangingFieldsStatic.GetFieldInfo(fldToken);
}
else
{
// We must get new copies each time we call continue b/c we get the
// actual Object ptr from the left side, which can move during a GC.
pInfo = pObject->GetHangingFieldTable()->GetFieldInfo(fldToken);
}
// We've found a previously located entry
if (pInfo != NULL)
{
*ppFieldData = pInfo;
return S_OK;
}
// Field information not already available - go get it
EX_TRY
{
// We're not going to be able to get the instance-specific field
// if we can't get the instance.
if (!fStatic && pObject->GetInfo().objRefBad)
{
ThrowHR(CORDBG_E_INVALID_OBJECT);
}
*ppFieldData = GetEnCFieldFromDac(fStatic, pObject, fldToken);
}
EX_CATCH_HRESULT(hr);
return hr;
}
//-----------------------------------------------------------------------------
// Get a FieldData (which rich information, including details about storage)
// from a metadata token.
//
// Parameters:
// fldToken - incoming metadata token specifying the field.
// ppFieldData - OUT: resulting FieldData structure.
//
// Returns:
// S_OK on success. else failure.
//-----------------------------------------------------------------------------
HRESULT CordbClass::GetFieldInfo(mdFieldDef fldToken, FieldData **ppFieldData)
{
INTERNAL_SYNC_API_ENTRY(GetProcess());
Init();
return SearchFieldInfo(GetModule(), &m_classInfo.m_fieldList, m_token, fldToken, ppFieldData);
}
//-----------------------------------------------------------------------------
// Search an array of FieldData (pFieldList) for a field (fldToken).
// The FieldData array must match the class supplied by classToken, and live
// in the supplied module.
//
// Internal helper used by CordbType::GetFieldInfo, CordbClass::GetFieldInfo
//
// Parameters:
// module - module containing the class that the FieldData array matches.
// pFieldList - array of fields to search through and the number of elements in
// the array.
// classToken - class that the data array matches. class must live in
// the supplied moudle.
// fldToken - metadata token of the field to search for. This field should be
// on the class supplied by classToken.
//
// Returns:
// CORDBG_E_ENC_HANGING_FIELD for "hanging fields" (fields added via Enc) (common error).
// Returns S_OK, set ppFieldData = pointer into data array for matching field. (*retval)->m_fldMetadataToken == fldToken)
// Throws on other errors.
//-----------------------------------------------------------------------------
/* static */
HRESULT CordbClass::SearchFieldInfo(
CordbModule * pModule,
DacDbiArrayList<FieldData> * pFieldList,
mdTypeDef classToken,
mdFieldDef fldToken,
FieldData **ppFieldData
)
{
unsigned int i;
IMetaDataImport * pImport = pModule->GetMetaDataImporter(); // throws
HRESULT hr = S_OK;
for (i = 0; i < pFieldList->Count(); i++)
{
if ((*pFieldList)[i].m_fldMetadataToken == fldToken)
{
// If the storage for this field isn't yet available (i.e. it is newly added with EnC)
if (!(*pFieldList)[i].m_fFldStorageAvailable)
{
// If we're a static literal, then return special HR to let
// debugger know that it should look it up via the metadata.
// Check m_fFldIsStatic first b/c that's fast.
if ((*pFieldList)[i].m_fFldIsStatic)
{
if (IsFieldStaticLiteral(pImport, fldToken))
{
ThrowHR(CORDBG_E_VARIABLE_IS_ACTUALLY_LITERAL);
}
}
// This is a field added by EnC, caller needs to get instance-specific info.
return CORDBG_E_ENC_HANGING_FIELD;
}
*ppFieldData = &((*pFieldList)[i]);
return S_OK;
}
}
// Hmmm... we didn't find the field on this class. See if the field really belongs to this class or not.
mdTypeDef classTok;
hr = pImport->GetFieldProps(fldToken, &classTok, NULL, 0, NULL, NULL, NULL, 0, NULL, NULL, NULL);
IfFailThrow(hr);
if (classTok == (mdTypeDef) classToken)
{
// Well, the field belongs in this class. The assumption is that the Runtime optimized the field away.
ThrowHR(CORDBG_E_FIELD_NOT_AVAILABLE);
}
// Well, the field doesn't even belong to this class...
ThrowHR(E_INVALIDARG);
}
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