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[cdac] Make DAC load and use cDAC when available (dotnet#100946)
- If `DOTNET_ENABLE_CDAC` environment variable is `1`, Look for `cdacreader` next to DAC and load it if found - Implement `ISOSDacInterface` in cDAC - currently returns `E_NOTIMPL` for everything - Make DAC delegate to cDAC (if available) for GetThreadStoreData and GetBreakingChangeVersion - Initialize cDAC with function for reading from the target
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,88 @@ | ||
| // Licensed to the .NET Foundation under one or more agreements. | ||
| // The .NET Foundation licenses this file to you under the MIT license. | ||
|
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| #include "cdac.h" | ||
| #include <sospriv.h> | ||
| #include <sstring.h> | ||
| #include "dbgutil.h" | ||
| #include <cdac_reader.h> | ||
|
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||
| #define CDAC_LIB_NAME MAKEDLLNAME_W(W("cdacreader")) | ||
|
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| namespace | ||
| { | ||
| bool TryLoadCDACLibrary(HMODULE *phCDAC) | ||
| { | ||
| // Load cdacreader from next to DAC binary | ||
| PathString path; | ||
| if (FAILED(GetClrModuleDirectory(path))) | ||
| return false; | ||
|
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| path.Append(CDAC_LIB_NAME); | ||
| *phCDAC = CLRLoadLibrary(path.GetUnicode()); | ||
| if (*phCDAC == NULL) | ||
| return false; | ||
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| return true; | ||
| } | ||
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| int ReadFromTargetCallback(uint64_t addr, uint8_t* dest, uint32_t count, void* context) | ||
| { | ||
| CDAC* cdac = reinterpret_cast<CDAC*>(context); | ||
| return cdac->ReadFromTarget(addr, dest, count); | ||
| } | ||
| } | ||
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| CDAC CDAC::Create(uint64_t descriptorAddr, ICorDebugDataTarget* target) | ||
| { | ||
| HMODULE cdacLib; | ||
| if (!TryLoadCDACLibrary(&cdacLib)) | ||
| return CDAC::Invalid(); | ||
|
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| return CDAC{cdacLib, descriptorAddr, target}; | ||
| } | ||
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| CDAC::CDAC(HMODULE module, uint64_t descriptorAddr, ICorDebugDataTarget* target) | ||
| : m_module(module) | ||
| , m_target{target} | ||
| { | ||
| if (m_module == NULL) | ||
| { | ||
| m_cdac_handle = NULL; | ||
| return; | ||
| } | ||
|
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| decltype(&cdac_reader_init) init = reinterpret_cast<decltype(&cdac_reader_init)>(::GetProcAddress(m_module, "cdac_reader_init")); | ||
| decltype(&cdac_reader_get_sos_interface) getSosInterface = reinterpret_cast<decltype(&cdac_reader_get_sos_interface)>(::GetProcAddress(m_module, "cdac_reader_get_sos_interface")); | ||
| _ASSERTE(init != nullptr && getSosInterface != nullptr); | ||
|
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| init(descriptorAddr, &ReadFromTargetCallback, this, &m_cdac_handle); | ||
| getSosInterface(m_cdac_handle, &m_sos); | ||
| } | ||
|
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| CDAC::~CDAC() | ||
| { | ||
| if (m_cdac_handle != NULL) | ||
| { | ||
| decltype(&cdac_reader_free) free = reinterpret_cast<decltype(&cdac_reader_free)>(::GetProcAddress(m_module, "cdac_reader_free")); | ||
| _ASSERTE(free != nullptr); | ||
| free(m_cdac_handle); | ||
| } | ||
|
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| if (m_module != NULL) | ||
| ::FreeLibrary(m_module); | ||
| } | ||
|
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| IUnknown* CDAC::SosInterface() | ||
| { | ||
| return m_sos; | ||
| } | ||
|
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| int CDAC::ReadFromTarget(uint64_t addr, uint8_t* dest, uint32_t count) | ||
| { | ||
| HRESULT hr = ReadFromDataTarget(m_target, addr, dest, count); | ||
| if (FAILED(hr)) | ||
| return hr; | ||
|
|
||
| return S_OK; | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,69 @@ | ||
| // Licensed to the .NET Foundation under one or more agreements. | ||
| // The .NET Foundation licenses this file to you under the MIT license. | ||
|
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||
| #ifndef CDAC_H | ||
| #define CDAC_H | ||
|
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| class CDAC final | ||
| { | ||
| public: // static | ||
| static CDAC Create(uint64_t descriptorAddr, ICorDebugDataTarget *pDataTarget); | ||
|
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| static CDAC Invalid() | ||
| { | ||
| return CDAC{nullptr, 0, nullptr}; | ||
| } | ||
|
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| public: | ||
| CDAC(const CDAC&) = delete; | ||
| CDAC& operator=(const CDAC&) = delete; | ||
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| CDAC(CDAC&& other) | ||
| : m_module{ other.m_module } | ||
| , m_cdac_handle{ other.m_cdac_handle } | ||
| , m_target{ other.m_target } | ||
| , m_sos{ other.m_sos.Extract() } | ||
| { | ||
| other.m_module = NULL; | ||
| other.m_cdac_handle = 0; | ||
| other.m_target = NULL; | ||
| other.m_sos = NULL; | ||
| } | ||
|
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| CDAC& operator=(CDAC&& other) | ||
| { | ||
| m_module = other.m_module; | ||
| m_cdac_handle = other.m_cdac_handle; | ||
| m_target = other.m_target; | ||
| m_sos = other.m_sos.Extract(); | ||
|
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| other.m_module = NULL; | ||
| other.m_cdac_handle = 0; | ||
| other.m_target = NULL; | ||
| other.m_sos = NULL; | ||
|
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| return *this; | ||
| } | ||
|
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| ~CDAC(); | ||
|
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| bool IsValid() const | ||
| { | ||
| return m_module != NULL && m_cdac_handle != 0; | ||
| } | ||
|
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| // This does not AddRef the returned interface | ||
| IUnknown* SosInterface(); | ||
| int ReadFromTarget(uint64_t addr, uint8_t* dest, uint32_t count); | ||
|
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| private: | ||
| CDAC(HMODULE module, uint64_t descriptorAddr, ICorDebugDataTarget* target); | ||
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| private: | ||
| HMODULE m_module; | ||
| intptr_t m_cdac_handle; | ||
| ICorDebugDataTarget* m_target; | ||
| NonVMComHolder<IUnknown> m_sos; | ||
| }; | ||
|
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||
| #endif // CDAC_H |
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