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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.
#include "stdafx.h"
#include "datatargetreader.h"
DataTargetReader::DataTargetReader(CORDB_ADDRESS remoteAddressCursor, ICorDebugDataTarget* pDataTarget, DWORD targetDefines, DWORD mdStructuresVersion)
: m_remotePointerSize(0),
m_currentStructureAlign(1),
m_targetDefines(targetDefines),
m_mdStructuresVersion(mdStructuresVersion)
{
m_remoteAddressCursor = remoteAddressCursor;
m_pDataTarget = pDataTarget;
m_pDataTarget->AddRef();
}
DataTargetReader::DataTargetReader(const DataTargetReader & otherReader)
{
m_pDataTarget = otherReader.m_pDataTarget;
m_pDataTarget->AddRef();
m_remotePointerSize = otherReader.m_remotePointerSize;
m_remoteAddressCursor = otherReader.m_remoteAddressCursor;
m_targetDefines = otherReader.m_targetDefines;
m_mdStructuresVersion = otherReader.m_mdStructuresVersion;
}
DataTargetReader & DataTargetReader::operator=(const DataTargetReader & otherReader)
{
if (this != &otherReader)
{
m_pDataTarget = otherReader.m_pDataTarget;
m_pDataTarget->AddRef();
m_remotePointerSize = otherReader.m_remotePointerSize;
m_remoteAddressCursor = otherReader.m_remoteAddressCursor;
m_targetDefines = otherReader.m_targetDefines;
m_mdStructuresVersion = otherReader.m_mdStructuresVersion;
}
return *this;
}
DataTargetReader::~DataTargetReader()
{
m_pDataTarget->Release();
m_pDataTarget = NULL;
}
HRESULT DataTargetReader::ReadPointer(CORDB_ADDRESS* pPointerValue)
{
HRESULT hr = S_OK;
if (m_remotePointerSize == 0)
{
IfFailRet(GetRemotePointerSize(&m_remotePointerSize));
}
_ASSERTE(m_remotePointerSize == 4 || m_remotePointerSize == 8);
*pPointerValue = 0;
if (m_remotePointerSize == 4)
return Read32((ULONG32*)pPointerValue);
else
return Read64((ULONG64*)pPointerValue);
}
HRESULT DataTargetReader::SkipPointer()
{
HRESULT hr = S_OK;
if (m_remotePointerSize == 0)
{
IfFailRet(GetRemotePointerSize(&m_remotePointerSize));
}
_ASSERTE(m_remotePointerSize == 4 || m_remotePointerSize == 8);
Align(m_remotePointerSize);
return SkipBytes(m_remotePointerSize);
}
HRESULT DataTargetReader::Read8(BYTE* pByteValue)
{
return ReadBytes(pByteValue, 1);
}
HRESULT DataTargetReader::Skip8()
{
return SkipBytes(1);
}
HRESULT DataTargetReader::Read32(ULONG32* pUlong32Value)
{
Align(4);
return ReadBytes((BYTE*)pUlong32Value, sizeof(ULONG32));
}
HRESULT DataTargetReader::Skip32()
{
Align(4);
return SkipBytes(sizeof(ULONG32));
}
HRESULT DataTargetReader::Read64(ULONG64* pUlong64Value)
{
Align(8);
return ReadBytes((BYTE*)pUlong64Value, sizeof(ULONG64));
}
HRESULT DataTargetReader::Skip64()
{
Align(8);
return SkipBytes(sizeof(ULONG64));
}
HRESULT DataTargetReader::ReadBytes(BYTE* pBuffer, DWORD cbBuffer)
{
HRESULT hr = S_OK;
ULONG32 cbTotalRead = 0;
CORDB_ADDRESS m_tempRemoteAddressCursor = m_remoteAddressCursor;
while (cbTotalRead < cbBuffer)
{
ULONG32 cbRead = 0;
if(FAILED(m_pDataTarget->ReadVirtual(m_remoteAddressCursor + cbTotalRead,
pBuffer + cbTotalRead,
cbBuffer - cbTotalRead,
&cbRead)))
return CORDBG_E_READVIRTUAL_FAILURE;
if (cbRead == 0)
return CORDBG_E_READVIRTUAL_FAILURE;
cbTotalRead += cbRead;
}
// on success only, move the cursor
m_remoteAddressCursor += cbTotalRead;
return S_OK;
}
HRESULT DataTargetReader::SkipBytes(DWORD cbRead)
{
m_remoteAddressCursor += cbRead;
return S_OK;
}
#ifndef MAX
#define MAX(a,b) ((a)>(b) ? (a) : (b))
#endif
HRESULT DataTargetReader::Read(TargetObject* pTargetObject)
{
ULONG32 previousAlign = m_currentStructureAlign;
m_currentStructureAlign = 1;
HRESULT hr = pTargetObject->ReadFrom(*this);
if (SUCCEEDED(hr))
{
// increase the structure size to a multiple of the maximum alignment of any of its members
Align(m_currentStructureAlign);
}
m_currentStructureAlign = MAX(previousAlign, m_currentStructureAlign);
return hr;
}
HRESULT DataTargetReader::ReadPointer(TargetObject* pTargetObject)
{
HRESULT hr = S_OK;
CORDB_ADDRESS pointerValue;
IfFailRet(ReadPointer(&pointerValue));
DataTargetReader reader = CreateReaderAt(pointerValue);
return pTargetObject->ReadFrom(reader);
}
void DataTargetReader::Align(DWORD alignmentBytes)
{
m_remoteAddressCursor = AlignUp(m_remoteAddressCursor, alignmentBytes);
m_currentStructureAlign = MAX(m_currentStructureAlign, alignmentBytes);
}
void DataTargetReader::AlignBase()
{
Align(m_currentStructureAlign);
}
HRESULT DataTargetReader::GetRemotePointerSize(ULONG32* pPointerSize)
{
HRESULT hr = S_OK;
CorDebugPlatform platform;
IfFailRet(m_pDataTarget->GetPlatform(&platform));
if ((platform == CORDB_PLATFORM_WINDOWS_X86) || (platform == CORDB_PLATFORM_POSIX_X86) || (platform == CORDB_PLATFORM_MAC_X86))
*pPointerSize = 4;
else if ((platform == CORDB_PLATFORM_WINDOWS_AMD64) || (platform == CORDB_PLATFORM_POSIX_AMD64) || (platform == CORDB_PLATFORM_MAC_AMD64))
*pPointerSize = 8;
else if ((platform == CORDB_PLATFORM_WINDOWS_ARM) || (platform == CORDB_PLATFORM_POSIX_ARM))
*pPointerSize = 4;
else if ((platform == CORDB_PLATFORM_WINDOWS_ARM64) || (platform == CORDB_PLATFORM_POSIX_ARM64))
*pPointerSize = 8;
else
return CORDBG_E_UNSUPPORTED;
return S_OK;
}
DWORD DataTargetReader::GetMDStructuresVersion()
{
return m_mdStructuresVersion;
}
BOOL DataTargetReader::IsDefined(DWORD define)
{
return (m_targetDefines & define) == define;
}
DataTargetReader DataTargetReader::CreateReaderAt(CORDB_ADDRESS remoteAddressCursor)
{
DataTargetReader newReader(remoteAddressCursor, m_pDataTarget, m_targetDefines, m_mdStructuresVersion);
return newReader;
}
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