dacimpl.h

// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
//*****************************************************************************
// File: dacimpl.h
//

//
// Central header file for external data access implementation.
//
//*****************************************************************************


#ifndef __DACIMPL_H__
#define __DACIMPL_H__

#include "gcinterface.dac.h"
//---------------------------------------------------------------------------------------
// Setting DAC_HASHTABLE tells the DAC to use the hand rolled hashtable for
// storing code:DAC_INSTANCE .  Otherwise, the DAC uses the STL unordered_map to.

#define DAC_HASHTABLE

#ifndef DAC_HASHTABLE
#pragma push_macro("return")
#undef return
#include <unordered_map>
#pragma pop_macro("return")
#endif //DAC_HASHTABLE
extern CRITICAL_SECTION g_dacCritSec;

// Convert between CLRDATA_ADDRESS and TADDR.
// Note that CLRDATA_ADDRESS is sign-extended (for compat with Windbg and OS conventions).  Converting
// from pointer-size values to CLRDATA_ADDRESS should ALWAYS use this TO_CDADDR macro to avoid bugs when
// dealing with 3/4GB 32-bit address spaces.  You must not rely on the compiler's implicit conversion
// from ULONG32 to ULONG64 - it is incorrect.  Ideally we'd use some compiler tricks or static analysis
// to help detect such errors (they are nefarious since 3/4GB addresses aren't well tested) .
//
// Note: We're in the process of switching the implementation over to CORDB_ADDRESS instead, which is also
// 64 bits, but 0-extended.  This means that conversions between TADDR and CORDB_ADDRESS are simple and natural,
// but as long as we have some legacy code, conversions involving CLRDATA_ADDRESS are a pain.  Eventually we
// should eliminate CLRDATA_ADDRESS entirely from the implementation, but that will require moving SOS off of
// the old DAC stuff etc.
//
// Here are the possible conversions:
// TADDR -> CLRDATA_ADDRESS:         TO_CDADDR
// CORDB_ADDRESS -> CLRDATA_ADDRESS: TO_CDADDR
// CLRDATA_ADDRESS -> TADDR:         CLRDATA_ADDRESS_TO_TADDR
// CORDB_ADDRESS -> TADDR:           CORDB_ADDRESS_TO_TADDR
// TADDR -> CORDB_ADDRESS:           implicit
// CLRDATA_ADDRESS -> CORDB_ADDRESS: CLRDATA_ADDRESS_TO_TADDR
//
#define TO_CDADDR(taddr) ((CLRDATA_ADDRESS)(LONG_PTR)(taddr))

// Convert a CLRDATA_ADDRESS (64-bit unsigned sign-extended target address) to a TADDR
inline TADDR CLRDATA_ADDRESS_TO_TADDR(CLRDATA_ADDRESS cdAddr)
{
    SUPPORTS_DAC;
#ifndef HOST_64BIT
    static_assert_no_msg(sizeof(TADDR)==sizeof(UINT));
    INT64 iSignedAddr = (INT64)cdAddr;
    if (iSignedAddr > INT_MAX || iSignedAddr < INT_MIN)
    {
        _ASSERTE_MSG(false, "CLRDATA_ADDRESS out of range for this platform");
        DacError(E_INVALIDARG);
    }
#endif
    return (TADDR)cdAddr;
}

// No throw, Convert a CLRDATA_ADDRESS (64-bit unsigned sign-extended target address) to a TADDR
// Use this in places where we know windbg may pass in bad addresses
inline HRESULT TRY_CLRDATA_ADDRESS_TO_TADDR(CLRDATA_ADDRESS cdAddr, TADDR* pOutTaddr)
{
    SUPPORTS_DAC;
#ifndef HOST_64BIT
    static_assert_no_msg(sizeof(TADDR)==sizeof(UINT));
    INT64 iSignedAddr = (INT64)cdAddr;
    if (iSignedAddr > INT_MAX || iSignedAddr < INT_MIN)
    {
        *pOutTaddr = 0;
        return E_INVALIDARG;
    }
#endif
    *pOutTaddr = (TADDR)cdAddr;
    return S_OK;
}

// Convert a CORDB_ADDRESS (64-bit unsigned 0-extended target address) to a TADDR
inline TADDR CORDB_ADDRESS_TO_TADDR(CORDB_ADDRESS cdbAddr)
{
    SUPPORTS_DAC;
#ifndef HOST_64BIT
    static_assert_no_msg(sizeof(TADDR)==sizeof(UINT));
    if (cdbAddr > UINT_MAX)
    {
        _ASSERTE_MSG(false, "CORDB_ADDRESS out of range for this platform");
        DacError(E_INVALIDARG);
    }
#endif
    return (TADDR)cdbAddr;
}

// TO_TADDR is the old way of converting CLRDATA_ADDRESSes to TADDRs.  Unfortunately,
// this has been used in many places to also cast pointers (void* etc.) to TADDR, and
// so we can't actually require the argument to be a valid CLRDATA_ADDRESS.  New code
// should use CLRDATA_ADDRESS_TO_TADDR instead.
#define TO_TADDR(cdaddr) ((TADDR)(cdaddr))

#define TO_CDENUM(ptr) ((CLRDATA_ENUM)(ULONG_PTR)(ptr))
#define FROM_CDENUM(type, cdenum) ((type*)(ULONG_PTR)(cdenum))

#define SIMPFRAME_ALL \
    (CLRDATA_SIMPFRAME_UNRECOGNIZED | \
     CLRDATA_SIMPFRAME_MANAGED_METHOD | \
     CLRDATA_SIMPFRAME_RUNTIME_MANAGED_CODE | \
     CLRDATA_SIMPFRAME_RUNTIME_UNMANAGED_CODE)

enum DAC_USAGE_TYPE
{
    DAC_DPTR,
    DAC_VPTR,
    DAC_STRA,
    DAC_STRW,
    DAC_PAL,
};

class ReflectionModule;

struct DAC_MD_IMPORT
{
    DAC_MD_IMPORT* next;       // list link field
    TADDR peFile;              // a TADDR for a PEAssembly* or a ReflectionModule*
    IMDInternalImport* impl;   // Associated metadata interface

    DAC_MD_IMPORT(TADDR peFile_,
        IMDInternalImport* impl_,
        DAC_MD_IMPORT* next_ = NULL)
        : next(next_)
        , peFile(peFile_)
        , impl(impl_)
    {
        SUPPORTS_DAC_HOST_ONLY;
    }
};


// This class maintains a cache of IMDInternalImport* and their corresponding
// source (a PEAssembly* or a ReflectionModule*), as a singly-linked list of
// DAC_MD_IMPORT nodes.  The cache is flushed whenever the process state changes
// by calling its Flush() member function.
class MDImportsCache
{
public:

    MDImportsCache()
        : m_head(NULL)
    {}

    ~MDImportsCache()
    {
        Flush();
    }

    FORCEINLINE
    IMDInternalImport* Get(TADDR key) const
    {
        SUPPORTS_DAC;
        for (DAC_MD_IMPORT* importList = m_head; importList; importList = importList->next)
        {
            if (importList->peFile == key)
            {
                return importList->impl;
            }
        }
        return NULL;
    }

    FORCEINLINE
    DAC_MD_IMPORT* Add(TADDR peFile, IMDInternalImport* impl)
    {
        SUPPORTS_DAC;
        DAC_MD_IMPORT* importList = new (nothrow) DAC_MD_IMPORT(peFile, impl, m_head);
        if (!importList)
        {
            return NULL;
        }

        m_head = importList;
        return importList;
    }

    void Flush()
    {
        DAC_MD_IMPORT* importList;

        while (m_head)
        {
            importList = m_head;
            m_head = importList->next;
            importList->impl->Release();
            delete importList;
        }
    }

private:

    DAC_MD_IMPORT* m_head;  // the beginning of the list of cached MD imports

};

struct METH_EXTENTS
{
    ULONG32 numExtents;
    ULONG32 curExtent;
    // Currently only one is needed.
    CLRDATA_ADDRESS_RANGE extents[1];
};

HRESULT ConvertUtf8(_In_ LPCUTF8 utf8,
                    ULONG32 bufLen,
                    ULONG32* nameLen,
                    _Out_writes_to_opt_(bufLen, *nameLen) PWSTR buffer);
HRESULT AllocUtf8(_In_opt_ LPCWSTR wstr,
                  ULONG32 srcChars,
                  _Outptr_ LPUTF8* utf8);

HRESULT GetFullClassNameFromMetadata(IMDInternalImport* mdImport,
                                     mdTypeDef classToken,
                                     ULONG32 bufferChars,
                                     _Inout_updates_(bufferChars) LPUTF8 buffer);
HRESULT GetFullMethodNameFromMetadata(IMDInternalImport* mdImport,
                                      mdMethodDef methodToken,
                                      ULONG32 bufferChars,
                                      _Inout_updates_(bufferChars) LPUTF8 buffer);

enum SplitSyntax
{
    SPLIT_METHOD,
    SPLIT_TYPE,
    SPLIT_FIELD,
    SPLIT_NO_NAME,
};

HRESULT SplitFullName(_In_z_ PCWSTR fullName,
                      SplitSyntax syntax,
                      ULONG32 memberDots,
                      _Outptr_opt_ LPUTF8* namespaceName,
                      _Outptr_opt_ LPUTF8* typeName,
                      _Outptr_opt_ LPUTF8* memberName,
                      _Outptr_opt_ LPUTF8* params);

int CompareUtf8(_In_ LPCUTF8 str1, _In_ LPCUTF8 str2, _In_ ULONG32 nameFlags);

#define INH_STATIC \
    (CLRDATA_VALUE_ALL_KINDS | \
     CLRDATA_VALUE_IS_INHERITED | CLRDATA_VALUE_FROM_STATIC)

HRESULT InitFieldIter(DeepFieldDescIterator* fieldIter,
                      TypeHandle typeHandle,
                      bool canHaveFields,
                      ULONG32 flags,
                      IXCLRDataTypeInstance* fromType);

ULONG32 GetTypeFieldValueFlags(TypeHandle typeHandle,
                               FieldDesc* fieldDesc,
                               ULONG32 otherFlags,
                               bool isDeref);

//----------------------------------------------------------------------------
//
// MetaEnum.
//
//----------------------------------------------------------------------------

class MetaEnum
{
public:
    MetaEnum(void)
    {
        Clear();
        m_appDomain = NULL;
    }
    ~MetaEnum(void)
    {
        End();
    }

    void Clear(void)
    {
        m_mdImport = NULL;
        m_kind = 0;
        m_lastToken = mdTokenNil;
    }

    HRESULT Start(IMDInternalImport* mdImport, ULONG32 kind,
                  mdToken container);
    void End(void);

    HRESULT NextToken(mdToken* token,
                      _Outptr_opt_result_maybenull_ LPCUTF8* namespaceName,
                      _Outptr_opt_result_maybenull_ LPCUTF8* name);
    HRESULT NextDomainToken(AppDomain** appDomain,
                            mdToken* token);
    HRESULT NextTokenByName(_In_opt_ LPCUTF8 namespaceName,
                            _In_opt_ LPCUTF8 name,
                            ULONG32 nameFlags,
                            mdToken* token);
    HRESULT NextDomainTokenByName(_In_opt_ LPCUTF8 namespaceName,
                                  _In_opt_ LPCUTF8 name,
                                  ULONG32 nameFlags,
                                  AppDomain** appDomain, mdToken* token);

    static HRESULT CdNextToken(CLRDATA_ENUM* handle,
                               mdToken* token)
    {
        MetaEnum* iter = FROM_CDENUM(MetaEnum, *handle);
        if (!iter)
        {
            return S_FALSE;
        }

        return iter->NextToken(token, NULL, NULL);
    }
    static HRESULT CdNextDomainToken(CLRDATA_ENUM* handle,
                                     AppDomain** appDomain,
                                     mdToken* token)
    {
        MetaEnum* iter = FROM_CDENUM(MetaEnum, *handle);
        if (!iter)
        {
            return S_FALSE;
        }

        return iter->NextDomainToken(appDomain, token);
    }
    static HRESULT CdEnd(CLRDATA_ENUM handle)
    {
        MetaEnum* iter = FROM_CDENUM(MetaEnum, handle);
        if (iter)
        {
            delete iter;
            return S_OK;
        }
        else
        {
            return E_INVALIDARG;
        }
    }

    IMDInternalImport* m_mdImport;
    ULONG32 m_kind;
    HENUMInternal m_enum;
    AppDomain* m_appDomain;
    mdToken m_lastToken;

    static HRESULT New(Module* mod,
                       ULONG32 kind,
                       mdToken container,
                       IXCLRDataAppDomain* pubAppDomain,
                       MetaEnum** metaEnum,
                       CLRDATA_ENUM* handle);
};

//----------------------------------------------------------------------------
//
// SplitName.
//
//----------------------------------------------------------------------------

class SplitName
{
public:
    // Type of name and splitting being done in this instance.
    SplitSyntax m_syntax;
    ULONG32 m_nameFlags;
    ULONG32 m_memberDots;

    // Split fields.
    LPUTF8 m_namespaceName;
    LPUTF8 m_typeName;
    mdTypeDef m_typeToken;
    LPUTF8 m_memberName;
    mdMethodDef m_memberToken;
    LPUTF8 m_params;
    // XXX Microsoft - Translated signature.

    // Arbitrary extra data.
    Thread* m_tlsThread;
    Module* m_module;
    MetaEnum m_metaEnum;
    DeepFieldDescIterator m_fieldEnum;
    ULONG64 m_objBase;
    FieldDesc* m_lastField;

    SplitName(SplitSyntax syntax, ULONG32 nameFlags,
              ULONG32 memberDots);
    ~SplitName(void)
    {
        Delete();
    }

    void Delete(void);
    void Clear(void);

    HRESULT SplitString(_In_opt_ PCWSTR fullName);

    bool FindType(IMDInternalImport* mdInternal);
    bool FindMethod(IMDInternalImport* mdInternal);
    bool FindField(IMDInternalImport* mdInternal);

    int Compare(LPCUTF8 str1, LPCUTF8 str2)
    {
        return CompareUtf8(str1, str2, m_nameFlags);
    }

    static HRESULT AllocAndSplitString(_In_opt_ PCWSTR fullName,
                                       SplitSyntax syntax,
                                       ULONG32 nameFlags,
                                       ULONG32 memberDots,
                                       SplitName** split);

    static HRESULT CdStartMethod(_In_opt_ PCWSTR fullName,
                                 ULONG32 nameFlags,
                                 Module* mod,
                                 mdTypeDef typeToken,
                                 AppDomain* appDomain,
                                 IXCLRDataAppDomain* pubAppDomain,
                                 SplitName** split,
                                 CLRDATA_ENUM* handle);
    static HRESULT CdNextMethod(CLRDATA_ENUM* handle,
                                mdMethodDef* token);
    static HRESULT CdNextDomainMethod(CLRDATA_ENUM* handle,
                                      AppDomain** appDomain,
                                      mdMethodDef* token);

    static HRESULT CdStartField(_In_opt_ PCWSTR fullName,
                                ULONG32 nameFlags,
                                ULONG32 fieldFlags,
                                IXCLRDataTypeInstance* fromTypeInst,
                                TypeHandle typeHandle,
                                Module* mod,
                                mdTypeDef typeToken,
                                ULONG64 objBase,
                                Thread* tlsThread,
                                IXCLRDataTask* pubTlsThread,
                                AppDomain* appDomain,
                                IXCLRDataAppDomain* pubAppDomain,
                                SplitName** split,
                                CLRDATA_ENUM* handle);
    static HRESULT CdNextField(ClrDataAccess* dac,
                               CLRDATA_ENUM* handle,
                               IXCLRDataTypeDefinition** fieldType,
                               ULONG32* fieldFlags,
                               IXCLRDataValue** value,
                               ULONG32 nameBufRetLen,
                               ULONG32* nameLenRet,
                               _Out_writes_to_opt_(nameBufRetLen, *nameLenRet) WCHAR nameBufRet[  ],
                               IXCLRDataModule** tokenScopeRet,
                               mdFieldDef* tokenRet);
    static HRESULT CdNextDomainField(ClrDataAccess* dac,
                                     CLRDATA_ENUM* handle,
                                     IXCLRDataValue** value);

    static HRESULT CdStartType(_In_opt_ PCWSTR fullName,
                               ULONG32 nameFlags,
                               Module* mod,
                               AppDomain* appDomain,
                               IXCLRDataAppDomain* pubAppDomain,
                               SplitName** split,
                               CLRDATA_ENUM* handle);
    static HRESULT CdNextType(CLRDATA_ENUM* handle,
                              mdTypeDef* token);
    static HRESULT CdNextDomainType(CLRDATA_ENUM* handle,
                                    AppDomain** appDomain,
                                    mdTypeDef* token);

    static HRESULT CdEnd(CLRDATA_ENUM handle)
    {
        SplitName* split = FROM_CDENUM(SplitName, handle);
        if (split)
        {
            delete split;
            return S_OK;
        }
        else
        {
            return E_INVALIDARG;
        }
    }
};

//----------------------------------------------------------------------------
//
// ProcessModIter.
//
//----------------------------------------------------------------------------

struct ProcessModIter
{
    bool m_nextDomain;
    AppDomain::AssemblyIterator m_assemIter;
    Assembly* m_curAssem;

    ProcessModIter(void)
    {
        SUPPORTS_DAC;
        m_nextDomain = true;
        m_curAssem = NULL;
    }

    Assembly * NextAssem()
    {
        SUPPORTS_DAC;

        if (m_nextDomain)
        {
            m_nextDomain = false;

            if (AppDomain::GetCurrentDomain() == nullptr)
            {
                return NULL;
            }

            m_assemIter = AppDomain::GetCurrentDomain()->IterateAssembliesEx((AssemblyIterationFlags)(
                kIncludeLoaded | kIncludeExecution));
        }

        CollectibleAssemblyHolder<Assembly *> pAssembly;
        if (!m_assemIter.Next(pAssembly.This()))
        {
            return NULL;
        }

        return pAssembly;
    }

    Module* NextModule(void)
    {
        SUPPORTS_DAC;
        m_curAssem = NextAssem();
        if (!m_curAssem)
        {
            return NULL;
        }

        return m_curAssem->GetModule();
    }
};

//----------------------------------------------------------------------------
//
// DacInstanceManager.
//
//----------------------------------------------------------------------------

// The data for an access may have special alignment needs and
// the cache must provide similar semantics.
#define DAC_INSTANCE_ALIGN 16

#define DAC_INSTANCE_SIG 0xdac1

// The instance manager allocates large blocks and then
// suballocates those for particular instances.
struct DAC_INSTANCE_BLOCK
{
    DAC_INSTANCE_BLOCK* next;
    ULONG32 bytesUsed;
    ULONG32 bytesFree;
};

#define DAC_INSTANCE_BLOCK_ALLOCATION 0x40000

// Sufficient memory is allocated to guarantee storage of the
// instance header plus room for alignment padding.
// Once the aligned pointer is found, this structure is prepended to
// the aligned pointer and therefore doesn't affect the alignment
// of the actual instance data.
struct DAC_INSTANCE
{
    DAC_INSTANCE* next;
    TADDR addr;
    ULONG32 size;
    // Identifying marker to give a simple
    // check for host->taddr validity.
    ULONG32 sig:16;
    // DPTR or VPTR.  See code:DAC_USAGE_TYPE
    ULONG32 usage:2;

    // Marker that can be used to prevent reporting this memory to the callback
    // object (via ICLRDataEnumMemoryRegionsCallback:EnumMemoryRegion)
    // more than once. This bit is checked only by the DacEnumHost?PtrMem
    // macros, so consistent use of those macros ensures that the memory is
    // reported at most once
    ULONG32 enumMem:1;

    // Marker to prevent metadata gets reported to mini-dump
    ULONG32 noReport:1;

    // Marker to determine if EnumMemoryRegions has been called on
    // a method descriptor
    ULONG32 MDEnumed:1;

#ifdef HOST_64BIT
    // Keep DAC_INSTANCE a multiple of DAC_INSTANCE_ALIGN
    // bytes in size.
    ULONG32 pad[2];
#endif
};

struct DAC_INSTANCE_PUSH
{
    DAC_INSTANCE_PUSH* next;
    DAC_INSTANCE_BLOCK* blocks;
    ULONG64 blockMemUsage;
    ULONG32 numInst;
    ULONG64 instMemUsage;
};

// The runtime will want the best access locality possible,
// so it's likely that many instances will be clustered.
// The hash function needs to spread near addresses across
// hash entries, so hash on the low bits of the target address.
// Not all the way down to the LSB, though, as there generally
// won't be individual accesses at the byte level.  Assume that
// most accesses will be natural-word aligned.
#define DAC_INSTANCE_HASH_BITS 10
#define DAC_INSTANCE_HASH_SHIFT 2

#define DAC_INSTANCE_HASH(addr) \
    (((ULONG32)(ULONG_PTR)(addr) >> DAC_INSTANCE_HASH_SHIFT) & \
     ((1 << DAC_INSTANCE_HASH_BITS) - 1))
#define DAC_INSTANCE_HASH_SIZE (1 << DAC_INSTANCE_HASH_BITS)


struct DumpMemoryReportStatics
{
    TSIZE_T    m_cbStack;              // number of bytes that we report directly for stack walk
    TSIZE_T    m_cbNgen;               // number of bytes that we report directly for ngen images
    TSIZE_T    m_cbModuleList;         // number of bytes that we report for module list directly
    TSIZE_T    m_cbClrStatics;         // number of bytes that we report for CLR statics
    TSIZE_T    m_cbClrHeapStatics;     // number of bytes that we report for CLR heap statics
    TSIZE_T    m_cbImplicitly;          // number of bytes that we report implicitly
};


class DacInstanceManager
{
public:
    DacInstanceManager(void);
    ~DacInstanceManager(void);

    DAC_INSTANCE* Add(DAC_INSTANCE* inst);

    DAC_INSTANCE* Alloc(TADDR addr, ULONG32 size, DAC_USAGE_TYPE usage);
    void ReturnAlloc(DAC_INSTANCE* inst);
    DAC_INSTANCE* Find(TADDR addr);
    HRESULT Write(DAC_INSTANCE* inst, bool throwEx);
    void Supersede(DAC_INSTANCE* inst);
    void Flush(void);
    void Flush(bool fSaveBlock);
    void ClearEnumMemMarker(void);

    void AddSuperseded(DAC_INSTANCE* inst)
    {
        SUPPORTS_DAC;
        inst->next = m_superseded;
        m_superseded = inst;
    }

    UINT DumpAllInstances(ICLRDataEnumMemoryRegionsCallback *pCallBack);

private:

    DAC_INSTANCE_BLOCK* FindInstanceBlock(DAC_INSTANCE* inst);
    void FreeAllBlocks(bool fSaveBlock);

    void InitEmpty(void)
    {
        m_blocks = NULL;
        // m_unusedBlock is not NULLed here; it can contain one block we will use after
        // a flush is complete.
        m_blockMemUsage = 0;
        m_numInst = 0;
        m_instMemUsage = 0;
#ifdef DAC_HASHTABLE
        ZeroMemory(m_hash, sizeof(m_hash));
#endif
        m_superseded = NULL;
        m_instPushed = NULL;
    }

#if defined(DAC_HASHTABLE)

    typedef struct _HashInstanceKey {
        TADDR addr;
        DAC_INSTANCE* instance;
    } HashInstanceKey;

    typedef struct _HashInstanceKeyBlock {
        // Blocks are chained in reverse order of allocation so that the most recently allocated
        // block is searched first.
        _HashInstanceKeyBlock* next;

        // Entries to a block are added from the max index on down so that recently added
        // entries are at the start of the block.
        DWORD firstElement;
        HashInstanceKey instanceKeys[] ;
    } HashInstanceKeyBlock;

// The hashing function does a good job of distributing the entries across buckets. To handle a
// SO on x86, we have under 250 entries in a bucket. A 4K block size allows 511 entries on x86 and
// about half that on x64. On x64, the number of entries added to the hash table is significantly
// smaller than on x86 (and the max recursion depth for default stack sizes is also far less), so
// 4K is generally adequate.

#define HASH_INSTANCE_BLOCK_ALLOC_SIZE (4 * 1024)
#define HASH_INSTANCE_BLOCK_NUM_ELEMENTS ((HASH_INSTANCE_BLOCK_ALLOC_SIZE - offsetof(_HashInstanceKeyBlock, instanceKeys))/sizeof(HashInstanceKey))
#endif // #if defined(DAC_HASHTABLE)

    DAC_INSTANCE_BLOCK* m_blocks;
    DAC_INSTANCE_BLOCK* m_unusedBlock;
    ULONG64 m_blockMemUsage;
    ULONG32 m_numInst;
    ULONG64 m_instMemUsage;

#if defined(DAC_HASHTABLE)
    HashInstanceKeyBlock* m_hash[DAC_INSTANCE_HASH_SIZE];
#else //DAC_HASHTABLE

    // We're going to use the STL unordered_map for our instance hash.
    // This has the benefit of scaling to different workloads appropriately (as opposed to having a
    // fixed number of buckets).

    class DacHashCompare : public std::hash_compare<TADDR>
    {
    public:
        // Custom hash function
        // The default hash function uses a pseudo-randomizing function to get a random
        // distribution.  In our case, we'd actually like a more even distribution to get
        // better access locality (see comments for DAC_INSTANCE_HASH_BITS).
        //
        // Also, when enumerating the hash during dump generation, clustering nearby addresses
        // together can have a significant positive impact on the performance of the minidump
        // library (at least the un-optimized version 6.5 linked into our dw20.exe - on Vista+
        // we use the OS's version 6.7+ with radically improved perf characteristics).  Having
        // a random distribution is actually the worst-case because it means most blocks won't
        // be merged until near the end, and a large number of intermediate blocks will have to
        // be searched with each call.
        //
        // The default pseudo-randomizing function also requires a call to ldiv which shows up as
        // a 3%-5% perf hit in most perf-sensitive scenarios, so this should also always be
        // faster.
        inline size_t operator()(const TADDR& keyval) const
        {
            return (unsigned)(keyval >>DAC_INSTANCE_HASH_SHIFT);
        }

        // Explicitly bring in the two-argument comparison function from the base class (just less-than)
        // This is necessary because once we override one form of operator() above, we don't automatically
        // get the others by C++ inheritance rules.
    using std::hash_compare<TADDR>::operator();

#ifdef NIDUMP_CUSTOMIZED_DAC_HASH   // not set
        //this particular number is supposed to be roughly the same amount of
        //memory as the old code (buckets * number of entries in the old
        //blocks.)
        //disabled for now.  May tweak implementation later.  It turns out that
        //having a large number of initial buckets is excellent for nidump, but it
        // is terrible for most other scenarios due to the cost of clearing them at
        // every Flush.  Once there is a better perf suite, we can tweak these values more.
        static const size_t min_buckets = DAC_INSTANCE_HASH_SIZE * 256;
#endif

    };
    typedef std::unordered_map<TADDR, DAC_INSTANCE*, DacHashCompare > DacInstanceHash;
    typedef DacInstanceHash::value_type DacInstanceHashValue;
    typedef DacInstanceHash::iterator DacInstanceHashIterator;
    DacInstanceHash m_hash;
#endif //DAC_HASHTABLE

    DAC_INSTANCE* m_superseded;
    DAC_INSTANCE_PUSH* m_instPushed;
};


#ifdef FEATURE_MINIMETADATA_IN_TRIAGEDUMPS

class DacStreamManager;

#endif // FEATURE_MINIMETADATA_IN_TRIAGEDUMPS

#include "cdac.h"

//----------------------------------------------------------------------------
//
// ClrDataAccess.
//
//----------------------------------------------------------------------------

class ClrDataAccess
    : public IXCLRDataProcess2,
      public ICLRDataEnumMemoryRegions,
      public ISOSDacInterface,
      public ISOSDacInterface2,
      public ISOSDacInterface3,
      public ISOSDacInterface4,
      public ISOSDacInterface5,
      public ISOSDacInterface6,
      public ISOSDacInterface7,
      public ISOSDacInterface8,
      public ISOSDacInterface9,
      public ISOSDacInterface10,
      public ISOSDacInterface11,
      public ISOSDacInterface12,
      public ISOSDacInterface13,
      public ISOSDacInterface14,
      public ISOSDacInterface15
{
public:
    ClrDataAccess(ICorDebugDataTarget * pTarget, ICLRDataTarget * pLegacyTarget=0);
    virtual ~ClrDataAccess(void);

    // IUnknown.
    STDMETHOD(QueryInterface)(THIS_
                              IN REFIID interfaceId,
                              OUT PVOID* iface);
    STDMETHOD_(ULONG, AddRef)(THIS);
    STDMETHOD_(ULONG, Release)(THIS);

    //
    // IXCLRDataProcess.
    //

    virtual HRESULT STDMETHODCALLTYPE Flush( void);

    virtual HRESULT STDMETHODCALLTYPE StartEnumTasks(
        /* [out] */ CLRDATA_ENUM *handle);

    virtual HRESULT STDMETHODCALLTYPE EnumTask(
        /* [in, out] */ CLRDATA_ENUM* handle,
        /* [out] */ IXCLRDataTask **task);

    virtual HRESULT STDMETHODCALLTYPE EndEnumTasks(
        /* [in] */ CLRDATA_ENUM handle);

    virtual HRESULT STDMETHODCALLTYPE GetTaskByOSThreadID(
        /* [in] */ ULONG32 OSThreadID,
        /* [out] */ IXCLRDataTask **task);

    virtual HRESULT STDMETHODCALLTYPE GetTaskByUniqueID(
        /* [in] */ ULONG64 uniqueID,
        /* [out] */ IXCLRDataTask **task);

    virtual HRESULT STDMETHODCALLTYPE GetFlags(
        /* [out] */ ULONG32 *flags);

    virtual HRESULT STDMETHODCALLTYPE IsSameObject(
        /* [in] */ IXCLRDataProcess *process);

    virtual HRESULT STDMETHODCALLTYPE GetManagedObject(
        /* [out] */ IXCLRDataValue **value);

    virtual HRESULT STDMETHODCALLTYPE GetDesiredExecutionState(
        /* [out] */ ULONG32 *state);

    virtual HRESULT STDMETHODCALLTYPE SetDesiredExecutionState(
        /* [in] */ ULONG32 state);

    virtual HRESULT STDMETHODCALLTYPE GetAddressType(
        /* [in] */ CLRDATA_ADDRESS address,
        /* [out] */ CLRDataAddressType* type);

    virtual HRESULT STDMETHODCALLTYPE GetRuntimeNameByAddress(
        /* [in] */ CLRDATA_ADDRESS address,
        /* [in] */ ULONG32 flags,
        /* [in] */ ULONG32 bufLen,
        /* [out] */ ULONG32 *nameLen,
        /* [size_is][out] */ _Out_writes_bytes_opt_(bufLen) WCHAR nameBuf[  ],
        /* [out] */ CLRDATA_ADDRESS* displacement);

    virtual HRESULT STDMETHODCALLTYPE StartEnumAppDomains(
        /* [out] */ CLRDATA_ENUM *handle);

    virtual HRESULT STDMETHODCALLTYPE EnumAppDomain(
        /* [in, out] */ CLRDATA_ENUM* handle,
        /* [out] */ IXCLRDataAppDomain **appDomain);

    virtual HRESULT STDMETHODCALLTYPE EndEnumAppDomains(
        /* [in] */ CLRDATA_ENUM handle);

    virtual HRESULT STDMETHODCALLTYPE GetAppDomainByUniqueID(
        /* [in] */ ULONG64 uniqueID,
        /* [out] */ IXCLRDataAppDomain **appDomain);

    virtual HRESULT STDMETHODCALLTYPE StartEnumAssemblies(
        /* [out] */ CLRDATA_ENUM *handle);

    virtual HRESULT STDMETHODCALLTYPE EnumAssembly(
        /* [in, out] */ CLRDATA_ENUM* handle,
        /* [out] */ IXCLRDataAssembly **assembly);

    virtual HRESULT STDMETHODCALLTYPE EndEnumAssemblies(
        /* [in] */ CLRDATA_ENUM handle);

    virtual HRESULT STDMETHODCALLTYPE StartEnumModules(
        /* [out] */ CLRDATA_ENUM *handle);

    virtual HRESULT STDMETHODCALLTYPE EnumModule(
        /* [in, out] */ CLRDATA_ENUM* handle,
        /* [out] */ IXCLRDataModule **mod);

    virtual HRESULT STDMETHODCALLTYPE EndEnumModules(
        /* [in] */ CLRDATA_ENUM handle);

    virtual HRESULT STDMETHODCALLTYPE GetModuleByAddress(
        /* [in] */ CLRDATA_ADDRESS address,
        /* [out] */ IXCLRDataModule** mod);

    virtual HRESULT STDMETHODCALLTYPE StartEnumMethodDefinitionsByAddress(
        /* [in] */ CLRDATA_ADDRESS address,
        /* [out] */ CLRDATA_ENUM *handle);

    virtual HRESULT STDMETHODCALLTYPE EnumMethodDefinitionByAddress(
        /* [in] */ CLRDATA_ENUM* handle,
        /* [out] */ IXCLRDataMethodDefinition **method);

    virtual HRESULT STDMETHODCALLTYPE EndEnumMethodDefinitionsByAddress(
        /* [in] */ CLRDATA_ENUM handle);

    virtual HRESULT STDMETHODCALLTYPE StartEnumMethodInstancesByAddress(
        /* [in] */ CLRDATA_ADDRESS address,
        /* [in] */ IXCLRDataAppDomain* appDomain,
        /* [out] */ CLRDATA_ENUM *handle);

    virtual HRESULT STDMETHODCALLTYPE EnumMethodInstanceByAddress(
        /* [in] */ CLRDATA_ENUM* handle,
        /* [out] */ IXCLRDataMethodInstance **method);

    virtual HRESULT STDMETHODCALLTYPE EndEnumMethodInstancesByAddress(
        /* [in] */ CLRDATA_ENUM handle);

    virtual HRESULT STDMETHODCALLTYPE GetDataByAddress(
        /* [in] */ CLRDATA_ADDRESS address,
        /* [in] */ ULONG32 flags,
        /* [in] */ IXCLRDataAppDomain* appDomain,
        /* [in] */ IXCLRDataTask* tlsTask,
        /* [in] */ ULONG32 bufLen,
        /* [out] */ ULONG32 *nameLen,
        /* [size_is][out] */ _Out_writes_to_opt_(bufLen, *nameLen) WCHAR nameBuf[  ],
        /* [out] */ IXCLRDataValue **value,
        /* [out] */ CLRDATA_ADDRESS *displacement);

    virtual HRESULT STDMETHODCALLTYPE GetExceptionStateByExceptionRecord(
        /* [in] */ EXCEPTION_RECORD64 *record,
        /* [out] */ IXCLRDataExceptionState **exception);

    virtual HRESULT STDMETHODCALLTYPE TranslateExceptionRecordToNotification(
        /* [in] */ EXCEPTION_RECORD64 *record,
        /* [in] */ IXCLRDataExceptionNotification *notify);

    virtual HRESULT STDMETHODCALLTYPE CreateMemoryValue(
        /* [in] */ IXCLRDataAppDomain* appDomain,
        /* [in] */ IXCLRDataTask* tlsTask,
        /* [in] */ IXCLRDataTypeInstance* type,
        /* [in] */ CLRDATA_ADDRESS addr,
        /* [out] */ IXCLRDataValue** value);

    virtual HRESULT STDMETHODCALLTYPE SetAllTypeNotifications(
        /* [in] */ IXCLRDataModule* mod,
        /* [in] */ ULONG32 flags);

    virtual HRESULT STDMETHODCALLTYPE SetAllCodeNotifications(
        /* [in] */ IXCLRDataModule* mod,
        /* [in] */ ULONG32 flags);

    virtual HRESULT STDMETHODCALLTYPE GetTypeNotifications(
        /* [in] */ ULONG32 numTokens,
        /* [in, size_is(numTokens)] */ IXCLRDataModule* mods[],
        /* [in] */ IXCLRDataModule* singleMod,
        /* [in, size_is(numTokens)] */ mdTypeDef tokens[],
        /* [out, size_is(numTokens)] */ ULONG32 flags[]);

    virtual HRESULT STDMETHODCALLTYPE SetTypeNotifications(
        /* [in] */ ULONG32 numTokens,
        /* [in, size_is(numTokens)] */ IXCLRDataModule* mods[],
        /* [in] */ IXCLRDataModule* singleMod,
        /* [in, size_is(numTokens)] */ mdTypeDef tokens[],
        /* [in, size_is(numTokens)] */ ULONG32 flags[],
        /* [in] */ ULONG32 singleFlags);

    virtual HRESULT STDMETHODCALLTYPE GetCodeNotifications(
        /* [in] */ ULONG32 numTokens,
        /* [in, size_is(numTokens)] */ IXCLRDataModule* mods[],
        /* [in] */ IXCLRDataModule* singleMod,
        /* [in, size_is(numTokens)] */ mdMethodDef tokens[],
        /* [out, size_is(numTokens)] */ ULONG32 flags[]);

    virtual HRESULT STDMETHODCALLTYPE SetCodeNotifications(
        /* [in] */ ULONG32 numTokens,
        /* [in, size_is(numTokens)] */ IXCLRDataModule* mods[],
        /* [in] */ IXCLRDataModule* singleMod,
        /* [in, size_is(numTokens)] */ mdMethodDef tokens[],
        /* [in, size_is(numTokens)] */ ULONG32 flags[],
        /* [in] */ ULONG32 singleFlags);

    virtual HRESULT STDMETHODCALLTYPE GetOtherNotificationFlags(
        /* [out] */ ULONG32* flags);

    virtual HRESULT STDMETHODCALLTYPE SetOtherNotificationFlags(
        /* [in] */ ULONG32 flags);

    virtual HRESULT STDMETHODCALLTYPE FollowStub(
        /* [in] */ ULONG32 inFlags,
        /* [in] */ CLRDATA_ADDRESS inAddr,
        /* [in] */ CLRDATA_FOLLOW_STUB_BUFFER* inBuffer,
        /* [out] */ CLRDATA_ADDRESS* outAddr,
        /* [out] */ CLRDATA_FOLLOW_STUB_BUFFER* outBuffer,
        /* [out] */ ULONG32* outFlags);

    virtual HRESULT STDMETHODCALLTYPE FollowStub2(
        /* [in] */ IXCLRDataTask* task,
        /* [in] */ ULONG32 inFlags,
        /* [in] */ CLRDATA_ADDRESS inAddr,
        /* [in] */ CLRDATA_FOLLOW_STUB_BUFFER* inBuffer,
        /* [out] */ CLRDATA_ADDRESS* outAddr,
        /* [out] */ CLRDATA_FOLLOW_STUB_BUFFER* outBuffer,
        /* [out] */ ULONG32* outFlags);

    virtual HRESULT STDMETHODCALLTYPE Request(
        /* [in] */ ULONG32 reqCode,
        /* [in] */ ULONG32 inBufferSize,
        /* [size_is][in] */ BYTE *inBuffer,
        /* [in] */ ULONG32 outBufferSize,
        /* [size_is][out] */ BYTE *outBuffer);


    //
    // IXCLRDataProcess2.
    //
    STDMETHOD(GetGcNotification)(/* [out] */ GcEvtArgs* gcEvtArgs);
    STDMETHOD(SetGcNotification)(/* [in] */ GcEvtArgs gcEvtArgs);

    //
    // ICLRDataEnumMemoryRegions.
    //
    virtual HRESULT STDMETHODCALLTYPE EnumMemoryRegions(
        /* [in] */ ICLRDataEnumMemoryRegionsCallback *callback,
        /* [in] */ ULONG32 miniDumpFlags,
        /* [in] */ CLRDataEnumMemoryFlags clrFlags);


    // ISOSDacInterface
    virtual HRESULT STDMETHODCALLTYPE GetThreadStoreData(struct DacpThreadStoreData *data);
    virtual HRESULT STDMETHODCALLTYPE GetAppDomainStoreData(struct DacpAppDomainStoreData *data);
    virtual HRESULT STDMETHODCALLTYPE GetAppDomainList(unsigned int count, CLRDATA_ADDRESS values[], unsigned int *pNeeded);
    virtual HRESULT STDMETHODCALLTYPE GetAppDomainData(CLRDATA_ADDRESS addr, struct DacpAppDomainData *data);
    virtual HRESULT STDMETHODCALLTYPE GetAppDomainName(CLRDATA_ADDRESS addr, unsigned int count, _Inout_updates_z_(count) WCHAR *name, unsigned int *pNeeded);
    virtual HRESULT STDMETHODCALLTYPE GetAssemblyList(CLRDATA_ADDRESS appDomain, int count, CLRDATA_ADDRESS values[], int *fetched);
    virtual HRESULT STDMETHODCALLTYPE GetAssemblyData(CLRDATA_ADDRESS domainPtr, CLRDATA_ADDRESS assembly, struct DacpAssemblyData *data);
    virtual HRESULT STDMETHODCALLTYPE GetAssemblyName(CLRDATA_ADDRESS assembly, unsigned int count, _Inout_updates_z_(count) WCHAR *name, unsigned int *pNeeded);
    virtual HRESULT STDMETHODCALLTYPE GetThreadData(CLRDATA_ADDRESS thread, struct DacpThreadData *data);
    virtual HRESULT STDMETHODCALLTYPE GetThreadFromThinlockID(UINT thinLockId, CLRDATA_ADDRESS *pThread);
    virtual HRESULT STDMETHODCALLTYPE GetStackLimits(CLRDATA_ADDRESS threadPtr, CLRDATA_ADDRESS *lower, CLRDATA_ADDRESS *upper, CLRDATA_ADDRESS *fp);
    virtual HRESULT STDMETHODCALLTYPE GetDomainFromContext(CLRDATA_ADDRESS context, CLRDATA_ADDRESS *domain);

    virtual HRESULT STDMETHODCALLTYPE GetMethodDescData(CLRDATA_ADDRESS methodDesc, CLRDATA_ADDRESS ip, struct DacpMethodDescData *data, ULONG cRevertedRejitVersions, DacpReJitData * rgRevertedRejitData, ULONG * pcNeededRevertedRejitData);
    virtual HRESULT STDMETHODCALLTYPE GetMethodDescPtrFromIP(CLRDATA_ADDRESS ip, CLRDATA_ADDRESS * ppMD);
    virtual HRESULT STDMETHODCALLTYPE GetMethodDescName(CLRDATA_ADDRESS methodDesc, unsigned int count, _Inout_updates_z_(count) WCHAR *name, unsigned int *pNeeded);
    virtual HRESULT STDMETHODCALLTYPE GetMethodDescPtrFromFrame(CLRDATA_ADDRESS frameAddr, CLRDATA_ADDRESS * ppMD);
    virtual HRESULT STDMETHODCALLTYPE GetCodeHeaderData(CLRDATA_ADDRESS ip, struct DacpCodeHeaderData *data);
    virtual HRESULT STDMETHODCALLTYPE GetThreadpoolData(struct DacpThreadpoolData *data);
    virtual HRESULT STDMETHODCALLTYPE GetWorkRequestData(CLRDATA_ADDRESS addrWorkRequest, struct DacpWorkRequestData *data);
    virtual HRESULT STDMETHODCALLTYPE GetObjectData(CLRDATA_ADDRESS objAddr, struct DacpObjectData *data);
    virtual HRESULT STDMETHODCALLTYPE GetObjectStringData(CLRDATA_ADDRESS obj, unsigned int count, _Inout_updates_z_(count) WCHAR *stringData, unsigned int *pNeeded);
    virtual HRESULT STDMETHODCALLTYPE GetObjectClassName(CLRDATA_ADDRESS obj, unsigned int count, _Inout_updates_z_(count) WCHAR *className, unsigned int *pNeeded);
    virtual HRESULT STDMETHODCALLTYPE GetMethodTableName(CLRDATA_ADDRESS mt, unsigned int count, _Inout_updates_z_(count) WCHAR *mtName, unsigned int *pNeeded);
    virtual HRESULT STDMETHODCALLTYPE GetMethodTableData(CLRDATA_ADDRESS mt, struct DacpMethodTableData *data);
    virtual HRESULT STDMETHODCALLTYPE GetMethodTableFieldData(CLRDATA_ADDRESS mt, struct DacpMethodTableFieldData *data);
    virtual HRESULT STDMETHODCALLTYPE GetMethodTableTransparencyData(CLRDATA_ADDRESS mt, struct DacpMethodTableTransparencyData *data);
    virtual HRESULT STDMETHODCALLTYPE GetMethodTableForEEClass(CLRDATA_ADDRESS eeClass, CLRDATA_ADDRESS *value);
    virtual HRESULT STDMETHODCALLTYPE GetFieldDescData(CLRDATA_ADDRESS fieldDesc, struct DacpFieldDescData *data);
    virtual HRESULT STDMETHODCALLTYPE GetFrameName(CLRDATA_ADDRESS vtable, unsigned int count, _Inout_updates_z_(count) WCHAR *frameName, unsigned int *pNeeded);
    virtual HRESULT STDMETHODCALLTYPE GetModule(CLRDATA_ADDRESS addr, IXCLRDataModule **mod);
    virtual HRESULT STDMETHODCALLTYPE GetModuleData(CLRDATA_ADDRESS moduleAddr, struct DacpModuleData *data);
    virtual HRESULT STDMETHODCALLTYPE TraverseModuleMap(ModuleMapType mmt, CLRDATA_ADDRESS moduleAddr, MODULEMAPTRAVERSE pCallback, LPVOID token);
    virtual HRESULT STDMETHODCALLTYPE GetMethodDescFromToken(CLRDATA_ADDRESS moduleAddr, mdToken token, CLRDATA_ADDRESS *methodDesc);
    virtual HRESULT STDMETHODCALLTYPE GetPEFileBase(CLRDATA_ADDRESS moduleAddr, CLRDATA_ADDRESS *base);
    virtual HRESULT STDMETHODCALLTYPE GetPEFileName(CLRDATA_ADDRESS moduleAddr, unsigned int count, _Inout_updates_z_(count) WCHAR *fileName, unsigned int *pNeeded);
    virtual HRESULT STDMETHODCALLTYPE GetAssemblyModuleList(CLRDATA_ADDRESS assembly, unsigned int count, CLRDATA_ADDRESS modules[], unsigned int *pNeeded);
    virtual HRESULT STDMETHODCALLTYPE GetGCHeapData(struct DacpGcHeapData *data);
    virtual HRESULT STDMETHODCALLTYPE GetGCHeapList(unsigned int count, CLRDATA_ADDRESS heaps[], unsigned int *pNeeded);
    virtual HRESULT STDMETHODCALLTYPE GetGCHeapDetails(CLRDATA_ADDRESS heap, struct DacpGcHeapDetails *details);
    virtual HRESULT STDMETHODCALLTYPE GetGCHeapStaticData(struct DacpGcHeapDetails *data);
    virtual HRESULT STDMETHODCALLTYPE GetHeapSegmentData(CLRDATA_ADDRESS seg, struct DacpHeapSegmentData *data);
    virtual HRESULT STDMETHODCALLTYPE GetDomainLocalModuleData(CLRDATA_ADDRESS addr, struct DacpDomainLocalModuleData *data);
    virtual HRESULT STDMETHODCALLTYPE GetDomainLocalModuleDataFromAppDomain(CLRDATA_ADDRESS appDomainAddr, int moduleID, struct DacpDomainLocalModuleData *data);
    virtual HRESULT STDMETHODCALLTYPE GetDomainLocalModuleDataFromModule(CLRDATA_ADDRESS moduleAddr, struct DacpDomainLocalModuleData *data);
    virtual HRESULT STDMETHODCALLTYPE GetSyncBlockData(unsigned int number, struct DacpSyncBlockData *data);
    virtual HRESULT STDMETHODCALLTYPE GetSyncBlockCleanupData(CLRDATA_ADDRESS addr, struct DacpSyncBlockCleanupData *data);
    virtual HRESULT STDMETHODCALLTYPE TraverseRCWCleanupList(CLRDATA_ADDRESS cleanupListPtr, VISITRCWFORCLEANUP pCallback, LPVOID token);
    virtual HRESULT STDMETHODCALLTYPE TraverseEHInfo(CLRDATA_ADDRESS ip, DUMPEHINFO pCallback, LPVOID token);
    virtual HRESULT STDMETHODCALLTYPE GetStressLogAddress(CLRDATA_ADDRESS *stressLog);
    virtual HRESULT STDMETHODCALLTYPE GetJitManagerList(unsigned int count, struct DacpJitManagerInfo managers[], unsigned int *pNeeded);
    virtual HRESULT STDMETHODCALLTYPE GetJitHelperFunctionName(CLRDATA_ADDRESS ip, unsigned int count, _Inout_updates_z_(count) char *name, unsigned int *pNeeded);
    virtual HRESULT STDMETHODCALLTYPE GetJumpThunkTarget(T_CONTEXT *ctx, CLRDATA_ADDRESS *targetIP, CLRDATA_ADDRESS *targetMD);
    virtual HRESULT STDMETHODCALLTYPE TraverseLoaderHeap(CLRDATA_ADDRESS loaderHeapAddr, VISITHEAP pCallback);
    virtual HRESULT STDMETHODCALLTYPE GetCodeHeapList(CLRDATA_ADDRESS jitManager, unsigned int count, struct DacpJitCodeHeapInfo codeHeaps[], unsigned int *pNeeded);
    virtual HRESULT STDMETHODCALLTYPE GetMethodTableSlot(CLRDATA_ADDRESS mt, unsigned int slot, CLRDATA_ADDRESS *value);
    virtual HRESULT STDMETHODCALLTYPE TraverseVirtCallStubHeap(CLRDATA_ADDRESS pAppDomain, VCSHeapType heaptype, VISITHEAP pCallback);
    virtual HRESULT STDMETHODCALLTYPE GetNestedExceptionData(CLRDATA_ADDRESS exception, CLRDATA_ADDRESS *exceptionObject, CLRDATA_ADDRESS *nextNestedException);
    virtual HRESULT STDMETHODCALLTYPE GetUsefulGlobals(struct DacpUsefulGlobalsData *data);
    virtual HRESULT STDMETHODCALLTYPE GetILForModule(CLRDATA_ADDRESS moduleAddr, DWORD rva, CLRDATA_ADDRESS *il);
    virtual HRESULT STDMETHODCALLTYPE GetClrWatsonBuckets(CLRDATA_ADDRESS thread, void *pGenericModeBlock);
    virtual HRESULT STDMETHODCALLTYPE GetOOMData(CLRDATA_ADDRESS oomAddr, struct DacpOomData *data);
    virtual HRESULT STDMETHODCALLTYPE GetOOMStaticData(struct DacpOomData *data);
    virtual HRESULT STDMETHODCALLTYPE GetHeapAnalyzeData(CLRDATA_ADDRESS addr,struct  DacpGcHeapAnalyzeData *data);
    virtual HRESULT STDMETHODCALLTYPE GetHeapAnalyzeStaticData(struct DacpGcHeapAnalyzeData *data);
    virtual HRESULT STDMETHODCALLTYPE GetMethodDescTransparencyData(CLRDATA_ADDRESS methodDesc, struct DacpMethodDescTransparencyData *data);
    virtual HRESULT STDMETHODCALLTYPE GetHillClimbingLogEntry(CLRDATA_ADDRESS addr, struct DacpHillClimbingLogEntry *data);
    virtual HRESULT STDMETHODCALLTYPE GetThreadLocalModuleData(CLRDATA_ADDRESS thread, unsigned int index, struct DacpThreadLocalModuleData *data);
    virtual HRESULT STDMETHODCALLTYPE GetRCWData(CLRDATA_ADDRESS addr, struct DacpRCWData *data);
    virtual HRESULT STDMETHODCALLTYPE GetRCWInterfaces(CLRDATA_ADDRESS rcw, unsigned int count, struct DacpCOMInterfacePointerData interfaces[], unsigned int *pNeeded);
    virtual HRESULT STDMETHODCALLTYPE GetCCWData(CLRDATA_ADDRESS ccw, struct DacpCCWData *data);
    virtual HRESULT STDMETHODCALLTYPE GetCCWInterfaces(CLRDATA_ADDRESS ccw, unsigned int count, struct DacpCOMInterfacePointerData interfaces[], unsigned int *pNeeded);
    virtual HRESULT STDMETHODCALLTYPE GetTLSIndex(ULONG *pIndex);
    virtual HRESULT STDMETHODCALLTYPE GetDacModuleHandle(HMODULE *phModule);

    virtual HRESULT STDMETHODCALLTYPE GetFailedAssemblyList(CLRDATA_ADDRESS appDomain, int count, CLRDATA_ADDRESS values[], unsigned int *pNeeded);
    virtual HRESULT STDMETHODCALLTYPE GetPrivateBinPaths(CLRDATA_ADDRESS appDomain, int count, _Inout_updates_z_(count) WCHAR *paths, unsigned int *pNeeded);
    virtual HRESULT STDMETHODCALLTYPE GetAssemblyLocation(CLRDATA_ADDRESS assembly, int count, _Inout_updates_z_(count) WCHAR *location, unsigned int *pNeeded);
    virtual HRESULT STDMETHODCALLTYPE GetAppDomainConfigFile(CLRDATA_ADDRESS appDomain, int count, _Inout_updates_z_(count) WCHAR *configFile, unsigned int *pNeeded);
    virtual HRESULT STDMETHODCALLTYPE GetApplicationBase(CLRDATA_ADDRESS appDomain, int count, _Inout_updates_z_(count) WCHAR *base, unsigned int *pNeeded);

    virtual HRESULT STDMETHODCALLTYPE GetFailedAssemblyData(CLRDATA_ADDRESS assembly, unsigned int *pContext, HRESULT *pResult);
    virtual HRESULT STDMETHODCALLTYPE GetFailedAssemblyLocation(CLRDATA_ADDRESS assembly, unsigned int count, _Inout_updates_z_(count) WCHAR *location, unsigned int *pNeeded);
    virtual HRESULT STDMETHODCALLTYPE GetFailedAssemblyDisplayName(CLRDATA_ADDRESS assembly, unsigned int count, _Inout_updates_z_(count) WCHAR *name, unsigned int *pNeeded);

    virtual HRESULT STDMETHODCALLTYPE GetStackReferences(DWORD osThreadID, ISOSStackRefEnum **ppEnum);
    virtual HRESULT STDMETHODCALLTYPE GetRegisterName(int regNum, unsigned int count, _Inout_updates_z_(count) WCHAR *buffer, unsigned int *pNeeded);

    virtual HRESULT STDMETHODCALLTYPE GetHandleEnum(ISOSHandleEnum **ppHandleEnum);
    virtual HRESULT STDMETHODCALLTYPE GetHandleEnumForTypes(unsigned int types[], unsigned int count, ISOSHandleEnum **ppHandleEnum);
    virtual HRESULT STDMETHODCALLTYPE GetHandleEnumForGC(unsigned int gen, ISOSHandleEnum **ppHandleEnum);

    virtual HRESULT STDMETHODCALLTYPE GetThreadAllocData(CLRDATA_ADDRESS thread, struct DacpAllocData *data);
    virtual HRESULT STDMETHODCALLTYPE GetHeapAllocData(unsigned int count, struct DacpGenerationAllocData *data, unsigned int *pNeeded);

    // ISOSDacInterface2
    virtual HRESULT STDMETHODCALLTYPE GetObjectExceptionData(CLRDATA_ADDRESS objAddr, struct DacpExceptionObjectData *data);
    virtual HRESULT STDMETHODCALLTYPE IsRCWDCOMProxy(CLRDATA_ADDRESS rcwAddr, BOOL* isDCOMProxy);

    // ISOSDacInterface3
    virtual HRESULT STDMETHODCALLTYPE GetGCInterestingInfoData(CLRDATA_ADDRESS interestingInfoAddr, struct DacpGCInterestingInfoData *data);
    virtual HRESULT STDMETHODCALLTYPE GetGCInterestingInfoStaticData(struct DacpGCInterestingInfoData *data);
    virtual HRESULT STDMETHODCALLTYPE GetGCGlobalMechanisms(size_t* globalMechanisms);

    // ISOSDacInterface4
    virtual HRESULT STDMETHODCALLTYPE GetClrNotification(CLRDATA_ADDRESS arguments[], int count, int *pNeeded);

    // ISOSDacInterface5
    virtual HRESULT STDMETHODCALLTYPE GetTieredVersions(CLRDATA_ADDRESS methodDesc, int rejitId, struct DacpTieredVersionData *nativeCodeAddrs, int cNativeCodeAddrs, int *pcNativeCodeAddrs);

    // ISOSDacInterface6
    virtual HRESULT STDMETHODCALLTYPE GetMethodTableCollectibleData(CLRDATA_ADDRESS mt, struct DacpMethodTableCollectibleData *data);

    // ISOSDacInterface7
    virtual HRESULT STDMETHODCALLTYPE GetPendingReJITID(CLRDATA_ADDRESS methodDesc, int *pRejitId);
    virtual HRESULT STDMETHODCALLTYPE GetReJITInformation(CLRDATA_ADDRESS methodDesc, int rejitId, struct DacpReJitData2 *pReJitData);
    virtual HRESULT STDMETHODCALLTYPE GetProfilerModifiedILInformation(CLRDATA_ADDRESS methodDesc, struct DacpProfilerILData *pILData);
    virtual HRESULT STDMETHODCALLTYPE GetMethodsWithProfilerModifiedIL(CLRDATA_ADDRESS mod, CLRDATA_ADDRESS *methodDescs, int cMethodDescs, int *pcMethodDescs);

    // ISOSDacInterface8
    virtual HRESULT STDMETHODCALLTYPE GetNumberGenerations(unsigned int *pGenerations);
    virtual HRESULT STDMETHODCALLTYPE GetGenerationTable(unsigned int cGenerations, struct DacpGenerationData *pGenerationData, unsigned int *pNeeded);
    virtual HRESULT STDMETHODCALLTYPE GetFinalizationFillPointers(unsigned int cFillPointers, CLRDATA_ADDRESS *pFinalizationFillPointers, unsigned int *pNeeded);

    virtual HRESULT STDMETHODCALLTYPE GetGenerationTableSvr(CLRDATA_ADDRESS heapAddr, unsigned int cGenerations, struct DacpGenerationData *pGenerationData, unsigned int *pNeeded);
    virtual HRESULT STDMETHODCALLTYPE GetFinalizationFillPointersSvr(CLRDATA_ADDRESS heapAddr, unsigned int cFillPointers, CLRDATA_ADDRESS *pFinalizationFillPointers, unsigned int *pNeeded);

    virtual HRESULT STDMETHODCALLTYPE GetAssemblyLoadContext(CLRDATA_ADDRESS methodTable, CLRDATA_ADDRESS* assemblyLoadContext);

    // ISOSDacInterface9
    virtual HRESULT STDMETHODCALLTYPE GetBreakingChangeVersion(int* pVersion);

    // ISOSDacInterface10
    virtual HRESULT STDMETHODCALLTYPE GetObjectComWrappersData(CLRDATA_ADDRESS objAddr, CLRDATA_ADDRESS *rcw, unsigned int count, CLRDATA_ADDRESS *mowList, unsigned int *pNeeded);
    virtual HRESULT STDMETHODCALLTYPE IsComWrappersCCW(CLRDATA_ADDRESS ccw, BOOL *isComWrappersCCW);
    virtual HRESULT STDMETHODCALLTYPE GetComWrappersCCWData(CLRDATA_ADDRESS ccw, CLRDATA_ADDRESS *managedObject, int *refCount);
    virtual HRESULT STDMETHODCALLTYPE IsComWrappersRCW(CLRDATA_ADDRESS rcw, BOOL *isComWrappersRCW);
    virtual HRESULT STDMETHODCALLTYPE GetComWrappersRCWData(CLRDATA_ADDRESS rcw, CLRDATA_ADDRESS *identity);

    // ISOSDacInterface11
    virtual HRESULT STDMETHODCALLTYPE IsTrackedType(
        CLRDATA_ADDRESS objAddr,
        BOOL *isTrackedType,
        BOOL *hasTaggedMemory);
    virtual HRESULT STDMETHODCALLTYPE GetTaggedMemory(
        CLRDATA_ADDRESS objAddr,
        CLRDATA_ADDRESS *taggedMemory,
        size_t *taggedMemorySizeInBytes);

    // ISOSDacInterface12
    virtual HRESULT STDMETHODCALLTYPE GetGlobalAllocationContext(
        CLRDATA_ADDRESS *allocPtr,
        CLRDATA_ADDRESS *allocLimit);

    // ISOSDacInterface13
    virtual HRESULT STDMETHODCALLTYPE TraverseLoaderHeap(CLRDATA_ADDRESS loaderHeapAddr, LoaderHeapKind kind, VISITHEAP pCallback);
    virtual HRESULT STDMETHODCALLTYPE GetDomainLoaderAllocator(CLRDATA_ADDRESS domainAddress, CLRDATA_ADDRESS *pLoaderAllocator);
    virtual HRESULT STDMETHODCALLTYPE GetLoaderAllocatorHeapNames(int count, const char **ppNames, int *pNeeded);
    virtual HRESULT STDMETHODCALLTYPE GetLoaderAllocatorHeaps(CLRDATA_ADDRESS loaderAllocator, int count, CLRDATA_ADDRESS *pLoaderHeaps, LoaderHeapKind *pKinds, int *pNeeded);
    virtual HRESULT STDMETHODCALLTYPE GetHandleTableMemoryRegions(ISOSMemoryEnum **ppEnum);
    virtual HRESULT STDMETHODCALLTYPE GetGCBookkeepingMemoryRegions(ISOSMemoryEnum **ppEnum);
    virtual HRESULT STDMETHODCALLTYPE GetGCFreeRegions(ISOSMemoryEnum **ppEnum);
    virtual HRESULT STDMETHODCALLTYPE LockedFlush();

    // ISOSDacInterface14
    virtual HRESULT STDMETHODCALLTYPE GetStaticBaseAddress(CLRDATA_ADDRESS methodTable, CLRDATA_ADDRESS *nonGCStaticsAddress, CLRDATA_ADDRESS *GCStaticsAddress);
    virtual HRESULT STDMETHODCALLTYPE GetThreadStaticBaseAddress(CLRDATA_ADDRESS methodTable, CLRDATA_ADDRESS thread, CLRDATA_ADDRESS *nonGCStaticsAddress, CLRDATA_ADDRESS *GCStaticsAddress);
    virtual HRESULT STDMETHODCALLTYPE GetMethodTableInitializationFlags(CLRDATA_ADDRESS methodTable, MethodTableInitializationFlags *initializationStatus);

    // ISOSDacInterface15
    virtual HRESULT STDMETHODCALLTYPE GetMethodTableSlotEnumerator(CLRDATA_ADDRESS mt, ISOSMethodEnum **enumerator);

    //
    // ClrDataAccess.
    //

    HRESULT Initialize(void);

    BOOL IsExceptionFromManagedCode(EXCEPTION_RECORD * pExceptionRecord);
#ifndef TARGET_UNIX
    HRESULT GetWatsonBuckets(DWORD dwThreadId, GenericModeBlock * pGM);
#endif // TARGET_UNIX


    Thread* FindClrThreadByTaskId(ULONG64 taskId);
    HRESULT IsPossibleCodeAddress(IN TADDR address);

    PCSTR GetJitHelperName(IN TADDR address,
                           IN bool dynamicHelpersOnly = false);
    HRESULT GetFullMethodName(IN MethodDesc* methodDesc,
                              IN ULONG32 symbolChars,
                              IN ULONG32* symbolLen,
                              _Out_writes_to_opt_(symbolChars, *symbolLen) LPWSTR symbol);
    HRESULT RawGetMethodName(/* [in] */ CLRDATA_ADDRESS address,
                             /* [in] */ ULONG32 flags,
                             /* [in] */ ULONG32 bufLen,
                             /* [out] */ ULONG32 *nameLen,
                             /* [size_is][out] */ _Out_writes_bytes_opt_(bufLen) WCHAR nameBuf[  ],
                             /* [out] */ CLRDATA_ADDRESS* displacement);

    HRESULT FollowStubStep(
        /* [in] */ Thread* thread,
        /* [in] */ ULONG32 inFlags,
        /* [in] */ TADDR inAddr,
        /* [in] */ union STUB_BUF* inBuffer,
        /* [out] */ TADDR* outAddr,
        /* [out] */ union STUB_BUF* outBuffer,
        /* [out] */ ULONG32* outFlags);

    HRESULT GetMethodExtents(MethodDesc* methodDesc,
                             METH_EXTENTS** extents);
    HRESULT GetMethodVarInfo(MethodDesc* methodDesc,
                             TADDR address,
                             ULONG32* numVarInfo,
                             ICorDebugInfo::NativeVarInfo** varInfo,
                             ULONG32* codeOffset);

    // If the method has multiple copies of code (because of EnC or code-pitching),
    // this returns the info corresponding to address.
    // If 'address' and 'codeOffset' are both non-NULL, *codeOffset gets set to
    // the offset of 'address' from the start of the method.
    HRESULT GetMethodNativeMap(MethodDesc* methodDesc,
                               TADDR address,
                               ULONG32* numMap,
                               DebuggerILToNativeMap** map,
                               bool* mapAllocated,
                               CLRDATA_ADDRESS* codeStart,
                               ULONG32* codeOffset);

    // Get the MethodDesc for a function
    MethodDesc * FindLoadedMethodRefOrDef(Module* pModule, mdToken memberRef);

#ifndef TARGET_UNIX
    HRESULT GetClrWatsonBucketsWorker(Thread * pThread, GenericModeBlock * pGM);
#endif // TARGET_UNIX

    HRESULT ServerGCHeapDetails(CLRDATA_ADDRESS heapAddr,
                                DacpGcHeapDetails *detailsData);
    HRESULT GetServerAllocData(unsigned int count, struct DacpGenerationAllocData *data, unsigned int *pNeeded);
    HRESULT ServerOomData(CLRDATA_ADDRESS addr, DacpOomData *oomData);
    HRESULT ServerGCInterestingInfoData(CLRDATA_ADDRESS addr, DacpGCInterestingInfoData *interestingInfoData);
    HRESULT ServerGCHeapAnalyzeData(CLRDATA_ADDRESS heapAddr,
                                DacpGcHeapAnalyzeData *analyzeData);

    //
    // Memory enumeration.
    //

    HRESULT EnumMemoryRegionsWrapper(CLRDataEnumMemoryFlags flags);

    // skinny minidump functions
    HRESULT EnumMemoryRegionsWorkerSkinny(CLRDataEnumMemoryFlags flags);
    // triage minidump functions
    HRESULT EnumMemoryRegionsWorkerMicroTriage(CLRDataEnumMemoryFlags flags);
    HRESULT EnumMemoryRegionsWorkerHeap(CLRDataEnumMemoryFlags flags);

    HRESULT EnumMemWalkStackHelper(CLRDataEnumMemoryFlags flags, IXCLRDataStackWalk  *pStackWalk, Thread * pThread);
    HRESULT DumpManagedObject(CLRDataEnumMemoryFlags flags, OBJECTREF objRef);
    HRESULT DumpManagedExcepObject(CLRDataEnumMemoryFlags flags, OBJECTREF objRef);
    HRESULT DumpManagedStackTraceStringObject(CLRDataEnumMemoryFlags flags, STRINGREF orefStackTrace);
#if (defined(FEATURE_COMINTEROP) || defined(FEATURE_COMWRAPPERS)) && !defined(TARGET_UNIX)
    HRESULT DumpStowedExceptionObject(CLRDataEnumMemoryFlags flags, CLRDATA_ADDRESS ccwPtr);
    HRESULT EnumMemStowedException(CLRDataEnumMemoryFlags flags);
#endif

    HRESULT EnumMemWriteDataSegment();

    // Custom Dump
    HRESULT EnumMemoryRegionsWorkerCustom();

    // helper function for dump code
    void EnumWksGlobalMemoryRegions(CLRDataEnumMemoryFlags flags);
    void EnumSvrGlobalMemoryRegions(CLRDataEnumMemoryFlags flags);

    HRESULT EnumMemCollectImages();
    HRESULT EnumMemCLRStatic(CLRDataEnumMemoryFlags flags);
    HRESULT EnumMemDumpJitManagerInfo(IN CLRDataEnumMemoryFlags flags);
    HRESULT EnumMemCLRHeapCrticalStatic(CLRDataEnumMemoryFlags flags);
    HRESULT EnumMemDumpModuleList(CLRDataEnumMemoryFlags flags);
    HRESULT EnumMemDumpAppDomainInfo(CLRDataEnumMemoryFlags flags);
    HRESULT EnumMemDumpAllThreadsStack(CLRDataEnumMemoryFlags flags);
    HRESULT EnumMemCLRMainModuleInfo();

    bool ReportMem(TADDR addr, TSIZE_T size, bool fExpectSuccess = true);
    bool DacUpdateMemoryRegion(TADDR addr, TSIZE_T bufferSize, BYTE* buffer);

    inline bool IsLogMessageEnabled()
    {
        return m_logMessageCb != NULL;
    }

    void LogMessage(LPCSTR message)
    {
        if (m_logMessageCb != NULL)
        {
            m_logMessageCb->LogMessage(message);
        }
    }

    void ClearDumpStats();
    JITNotification* GetHostJitNotificationTable();
    GcNotification*  GetHostGcNotificationTable();

    void* GetMetaDataFromHost(PEAssembly* pPEAssembly);

    virtual
    interface IMDInternalImport* GetMDImport(const PEAssembly* pPEAssembly,
                                             const ReflectionModule* reflectionModule,
                                             bool throwEx);

    interface IMDInternalImport* GetMDImport(const PEAssembly* pPEAssembly,
                                             bool throwEx)
    {
        return GetMDImport(pPEAssembly, NULL, throwEx);
    }

    interface IMDInternalImport* GetMDImport(const ReflectionModule* reflectionModule,
                                             bool throwEx)
    {
        return GetMDImport(NULL, reflectionModule, throwEx);
    }

    //ClrDump support
    HRESULT STDMETHODCALLTYPE DumpNativeImage(CLRDATA_ADDRESS loadedBase,
                                              LPCWSTR name,
                                              IXCLRDataDisplay *display,
                                              IXCLRLibrarySupport *support,
                                              IXCLRDisassemblySupport *dis);

    // Set whether inconsistencies in the target should raise asserts.
    void SetTargetConsistencyChecks(bool fEnableAsserts);

    // Get whether inconsistencies in the target should raise asserts.
    bool TargetConsistencyAssertsEnabled();

    // Get the ICLRDataTarget2 instance, if any
    ICLRDataTarget2 * GetLegacyTarget2()        { return m_pLegacyTarget2; }

    // Get the ICLRDataTarget3 instance, if any
    ICLRDataTarget3 * GetLegacyTarget3()        { return m_pLegacyTarget3; }

    //
    // Public Fields
    // Note that it would be nice if all of these were made private.  However, the visibility
    // model of the DAC implementation is that the public surface area is declared in daccess.h
    // (implemented in dacfn.cpp), and the private surface area (like ClrDataAccess) is declared
    // in dacimpl.h which is only included by the DAC infrastructure.  Therefore the DAC
    // infrastructure agressively uses these fields, and we don't get a huge amount of benefit from
    // reworking this model (since there is some form of encapsulation in place already).
    //

    // The underlying data target - always present (strong reference)
    ICorDebugDataTarget * m_pTarget;

    // Mutable version of the data target if any - optional (strong reference)
    ICorDebugMutableDataTarget * m_pMutableTarget;

    TADDR m_globalBase;
    DacGlobals m_dacGlobals;
    DacInstanceManager m_instances;
    ULONG32 m_instanceAge;
    bool m_debugMode;

    // This currently exists on the DAC as a way of managing lifetime of loading/freeing the cdacreader
    // TODO: [cdac] Remove when cDAC deploys with SOS - https://github.com/dotnet/runtime/issues/108720
    CDAC m_cdac;

#ifdef FEATURE_MINIMETADATA_IN_TRIAGEDUMPS

protected:
    DacStreamManager * m_streams;

public:
    // Used to mark the point after which enumerated EE structs of interest
    // will get their names cached in the triage/mini-dump
    void InitStreamsForWriting(IN CLRDataEnumMemoryFlags flags);

    // Used during triage/mini-dump collection to populate the map of
    // pointers to EE struct (MethodDesc* for now) to their corresponding
    // name.
    bool MdCacheAddEEName(TADDR taEEStruct, const SString& name);

    // Used to mark the end point for the name caching. Will update streams
    // based on built caches
    void EnumStreams(IN CLRDataEnumMemoryFlags flags);

    // Used during triage/mini-dump analysis to retrieve the name associated
    // with an EE struct pointer (MethodDesc* for now).
    bool MdCacheGetEEName(TADDR taEEStruct, SString & eeName);

#endif // FEATURE_MINIMETADATA_IN_TRIAGEDUMPS

private:
    // Read the DAC table and initialize m_dacGlobals
    HRESULT GetDacGlobalValues();

    // Verify the target mscorwks.dll matches the version expected
    HRESULT VerifyDlls();

    // Check whether a region of memory is fully readable.
    bool IsFullyReadable(TADDR addr, TSIZE_T size);

    // Legacy target interfaces - optional
    ICLRDataTarget * m_pLegacyTarget;
    ICLRDataTarget2 * m_pLegacyTarget2;
    ICLRDataTarget3 * m_pLegacyTarget3;
    IXCLRDataTarget3 * m_target3;
    ICLRMetadataLocator * m_legacyMetaDataLocator;

    LONG m_refs;
    MDImportsCache m_mdImports;
    ICLRDataEnumMemoryRegionsCallback* m_enumMemCb;
    ICLRDataEnumMemoryRegionsCallback2* m_updateMemCb;
    ICLRDataLoggingCallback* m_logMessageCb;
    CLRDataEnumMemoryFlags m_enumMemFlags;
    JITNotification* m_jitNotificationTable;
    GcNotification*  m_gcNotificationTable;
    TSIZE_T m_cbMemoryReported;
    DumpMemoryReportStatics m_dumpStats;

    // If true, inconsistencies in the target will cause ASSERTs to be raised in DEBUG builds
    bool m_fEnableTargetConsistencyAsserts;

#ifdef _DEBUG
protected:
    // If true, a mscorwks/mscordacwks mismatch will trigger a nice assert dialog
    bool m_fEnableDllVerificationAsserts;
private:
#endif

protected:
    // Populates a DacpJitCodeHeapInfo with proper information about the
    // code heap type and the information needed to locate it.
    DacpJitCodeHeapInfo DACGetHeapInfoForCodeHeap(CodeHeap *heapAddr);

#ifdef FEATURE_COMINTEROP
    // Returns CCW pointer based on a target address.
    PTR_ComCallWrapper DACGetCCWFromAddress(CLRDATA_ADDRESS addr);

private:
    // Returns COM interface pointer corresponding to a given CCW and internal vtable
    // index. Returns NULL if the vtable is unused or not fully laid out.
    PTR_IUnknown DACGetCOMIPFromCCW(PTR_ComCallWrapper pCCW, int vtableIndex);
#endif

#ifdef FEATURE_COMWRAPPERS
    BOOL DACGetComWrappersCCWVTableQIAddress(CLRDATA_ADDRESS ccwPtr, TADDR *vTableAddress, TADDR *qiAddress);
    BOOL DACIsComWrappersCCW(CLRDATA_ADDRESS ccwPtr);
    TADDR DACGetManagedObjectWrapperFromCCW(CLRDATA_ADDRESS ccwPtr);
    HRESULT DACTryGetComWrappersObjectFromCCW(CLRDATA_ADDRESS ccwPtr, OBJECTREF* objRef);
#endif

protected:
#ifdef FEATURE_COMWRAPPERS
    HRESULT DACTryGetComWrappersHandleFromCCW(CLRDATA_ADDRESS ccwPtr, OBJECTHANDLE* objHandle);
#endif

public:
    // API for picking up the info needed for a debugger to look up an image from its search path.
    static bool GetMetaDataFileInfoFromPEFile(PEAssembly *pPEAssembly,
                                              DWORD &dwImageTimestamp,
                                              DWORD &dwImageSize,
                                              DWORD &dwDataSize,
                                              DWORD &dwRvaHint,
                                              _Out_writes_(cchFilePath) LPWSTR wszFilePath,
                                              DWORD cchFilePath);
};

extern ClrDataAccess* g_dacImpl;

/*     DacHandleWalker.
 *
 * Iterates over the handle table, enumerating all handles of the requested type on the
 * handle table.  This also will report the handle type, whether the handle is a strong
 * reference, the AppDomain the handle comes from, as well as the reference count (in
 * the case of a RefCount handle).  Optionally this class can also be used to filter
 * based on GC generation that would be collected (that is, to emulate a GC scan of the
 * handle table).
 *
 *     General implementation details:
 * We have four sets of variables:
 * 1.  Overhead variables needed to operate in the Dac.
 * 2.  Variables needed to walk the handle table.  We walk the handle table one bucket
 *     at a time, filling the array the user gave us until we have either enumerated
 *     all handles, or filled the array.
 * 3.  Storage variables to hold the overflow.  That is, we were walking the handle
 *     table, filled the array that the user gave us, then needed to store the extra
 *     handles the handle table continued to enumerate to us.  This is implemented
 *     as a linked list of arrays (mHead, mHead.Next, etc).
 * 4.  Variables which store the location of where we are in the overflow data.
 *
 * Note that "mHead" is a HandleChunkHead where we stuff the user's array.  Everything
 * which follows mHead (mHead.Next, etc) is a HandleChunk containing overflow data.
 *
 * Lastly, note this does not do robust error handling.  If we fail to allocate a
 * HandleChunk while walking the handle table, we will miss handles and not report
 * this to the user.  Unfortunately this will have to be fixed in the next iteration
 * when we add more robust error handling to SOS's interface.
 */
 template <class T, REFIID IID_T>
class DefaultCOMImpl : public T
{
public:
    DefaultCOMImpl()
        : mRef(0)
    {
    }

    virtual ~DefaultCOMImpl() {}

    ULONG STDMETHODCALLTYPE AddRef()
    {
        return ++mRef;
    }

    ULONG STDMETHODCALLTYPE Release()
    {
        ULONG res = mRef--;
        if (res == 0)
            delete this;
        return res;
    }

    HRESULT STDMETHODCALLTYPE QueryInterface(REFIID riid, void **ppObj)
    {
        if (ppObj == NULL)
            return E_INVALIDARG;

        if (IsEqualIID(riid, IID_IUnknown))
        {
            AddRef();
            *ppObj = static_cast<IUnknown*>(this);
            return S_OK;
        }
        else if (IsEqualIID(riid, IID_T))
        {
            AddRef();
            *ppObj = static_cast<T*>(this);
            return S_OK;
        }

        *ppObj = NULL;
        return E_NOINTERFACE;
    }

private:
    ULONG mRef;
};


// A struct representing a thread's allocation context.
struct AllocInfo
{
    CORDB_ADDRESS Ptr;
    CORDB_ADDRESS Limit;

    AllocInfo()
        : Ptr(0), Limit(0)
    {
    }
};

// A struct representing a segment in the heap.
struct SegmentData
{
    CORDB_ADDRESS Start;
    CORDB_ADDRESS End;

    // Whether this segment is part of the large object heap.
    int Generation;

    SegmentData()
        : Start(0), End(0), Generation(0)
    {
    }
};

// A struct representing a gc heap in the process.
struct HeapData
{
    CORDB_ADDRESS YoungestGenPtr;
    CORDB_ADDRESS YoungestGenLimit;

    CORDB_ADDRESS Gen0Start;
    CORDB_ADDRESS Gen0End;

    CORDB_ADDRESS Gen1Start;
    size_t EphemeralSegment;

    size_t SegmentCount;
    SegmentData *Segments;

    HeapData();
    ~HeapData();
};

/* This cache is used to read data from the target process if the reads are known
 * to be sequential.  This will object will read one page of memory out of the
 * process at a time, aligned to the page boundary, to
 */
class LinearReadCache
{
public:
    LinearReadCache();
    ~LinearReadCache();

    /* Reads an address out of the target process, caching the page of memory read.
     * Params:
     *   addr - The address to read out of the target process.
     *   t - A pointer to the data to stuff it in.  We will read sizeof(T) data
     *       from the process and write it into the location t points to.  This
     *       parameter must be non-null.
     * Returns:
     *   True if the read succeeded.  False if it did not, usually as a result
     *   of the memory simply not being present in the target process.
     * Note:
     *   The state of *t is undefined if this function returns false.  We may
     *   have written partial data to it if we return false, so you must
     *   absolutely NOT use it if Read returns false.
     */
    template <class T>
    bool Read(CORDB_ADDRESS addr, T *t)
    {
        _ASSERTE(t);

        // Unfortunately the ctor can fail the alloc for the byte array.  In this case
        // we'll just fall back to non-cached reads.
        if (mPage == NULL)
            return MisalignedRead(addr, t);

        // Is addr on the current page?  If not read the page of memory addr is on.
        // If this fails, we will fall back to a raw read out of the process (which
        // is what MisalignedRead does).
        if ((addr < mCurrPageStart) || (addr - mCurrPageStart > mCurrPageSize))
            if (!MoveToPage(addr))
                return MisalignedRead(addr, t);

        // If MoveToPage succeeds, we MUST be on the right page.
        _ASSERTE(addr >= mCurrPageStart);

        // However, the amount of data requested may fall off of the page.  In that case,
        // fall back to MisalignedRead.
        CORDB_ADDRESS offset = addr - mCurrPageStart;
        if (offset + sizeof(T) > mCurrPageSize)
            return MisalignedRead(addr, t);

        // If we reach here we know we are on the right page of memory in the cache, and
        // that the read won't fall off of the end of the page.
        *t = *reinterpret_cast<T*>(mPage+offset);
        return true;
    }

    // helper used to read the MethodTable
    bool ReadMT(CORDB_ADDRESS addr, TADDR *mt)
    {
        if (!Read(addr, mt))
            return false;

        // clear the GC flag bits off the MethodTable
        // equivalent to Object::GetGCSafeMethodTable()
#if TARGET_64BIT
        *mt &= ~7;
#else
        *mt &= ~3;
#endif
        return true;
    }

private:
    /* Sets the cache to the page specified by addr, or false if we could not move to
     * that page.
     */
    bool MoveToPage(CORDB_ADDRESS addr);

    /* Attempts to read from the target process if the data is possibly hanging off
     * the end of a page.
     */
    template<class T>
    inline bool MisalignedRead(CORDB_ADDRESS addr, T *t)
    {
        return SUCCEEDED(DacReadAll(TO_TADDR(addr), t, sizeof(T), false));
    }

private:
    CORDB_ADDRESS mCurrPageStart;
    ULONG32 mPageSize, mCurrPageSize;
    BYTE *mPage;
};

DWORD DacGetNumHeaps();

/* The implementation of the dac heap walker.  This class will enumerate all objects on
 * the heap with three important caveats:
 * - This class will skip all Free objects in the heap.  Free objects are an
 *   implementation detail of the GC, and ICorDebug does not have a mechanism
 *   to expose them.
 * - This class does NOT guarantee that all objects will be enumerated.  In
 *   the event that we find heap corruption on a segment, or if the background
 *   GC is modifying a segment, the remainder of that segment will be skipped
 *   by design.
 * - The GC heap must be in a walkable state before you attempt to use this
 *   class on it.  The IDacDbiInterface::AreGCStructuresValid function will
 *   tell you whether it is safe to walk the heap or not.
 */
class DacHeapWalker
{
    static CORDB_ADDRESS HeapStart;
    static CORDB_ADDRESS HeapEnd;

public:
    DacHeapWalker();
    ~DacHeapWalker();

    /* Initializes the heap walker.  This must be called before Next or
     * HasMoreObjects.  Returns false if the initialization was not successful.
     * (In practice this should only return false if we hit an OOM trying
     * to allocate space for data structures.)  Limits the heap walk to be in the range
     * [start, end] (inclusive).  Use DacHeapWalker::HeapStart, DacHeapWalker::HeapEnd
     * as start or end to start from the beginning or end.
     */
    HRESULT Init(CORDB_ADDRESS start=HeapStart, CORDB_ADDRESS end=HeapEnd);

    /* Returns a CORDB_ADDRESS which points to the next value on the heap.
     * You must call HasMoreObjects on this class, and it must return true
     * before calling Next.
     */
    HRESULT Next(CORDB_ADDRESS *pValue, CORDB_ADDRESS *pMT, ULONG64 *size);

    /* Returns true if there are more objects on the heap, false otherwise.
     */
    inline bool HasMoreObjects() const
    {
        return mCurrHeap < mHeapCount;
    }

    HRESULT Reset(CORDB_ADDRESS start, CORDB_ADDRESS end);

    static HRESULT InitHeapDataWks(HeapData *&pHeaps, size_t &count);
    static HRESULT InitHeapDataSvr(HeapData *&pHeaps, size_t &count);

    HRESULT GetHeapData(HeapData **ppHeapData, size_t *pNumHeaps);

    SegmentData *FindSegment(CORDB_ADDRESS obj);

    HRESULT ListNearObjects(CORDB_ADDRESS obj, CORDB_ADDRESS *pPrev, CORDB_ADDRESS *pContaining, CORDB_ADDRESS *pNext);

private:
    HRESULT MoveToNextObject();

    bool GetSize(TADDR tMT, size_t &size);

    inline static size_t Align(size_t size)
    {
        if (sizeof(TADDR) == 4)
            return (size+3) & ~3;
        else
            return (size+7) & ~7;
    }

    inline static size_t AlignLarge(size_t size)
    {
        return (size + 7) & ~7;
    }

    template <class T>
    static int GetSegmentCount(T seg_start)
    {
        int count = 0;
        while (seg_start)
        {
            seg_start = seg_start->next;
            count++;
        }

        return count;
    }

    HRESULT NextSegment();
    void CheckAllocAndSegmentRange();

private:
    int mThreadCount;
    AllocInfo *mAllocInfo;

    size_t mHeapCount;
    HeapData *mHeaps;

    CORDB_ADDRESS mCurrObj;
    size_t mCurrSize;
    TADDR mCurrMT;

    size_t mCurrHeap;
    size_t mCurrSeg;

    CORDB_ADDRESS mStart;
    CORDB_ADDRESS mEnd;

    LinearReadCache mCache;
    static CORDB_ADDRESS sFreeMT;
};

struct SOSStackErrorList
{
    SOSStackRefError error;
    SOSStackErrorList *pNext;

    SOSStackErrorList()
        : pNext(0)
    {
    }
};

class DacStackReferenceWalker;
class DacStackReferenceErrorEnum : public DefaultCOMImpl<ISOSStackRefErrorEnum, IID_ISOSStackRefErrorEnum>
{
public:
    DacStackReferenceErrorEnum(DacStackReferenceWalker *pEnum, SOSStackErrorList *pErrors);
    ~DacStackReferenceErrorEnum();

    HRESULT STDMETHODCALLTYPE Skip(unsigned int count);
    HRESULT STDMETHODCALLTYPE Reset();
    HRESULT STDMETHODCALLTYPE GetCount(unsigned int *pCount);
    HRESULT STDMETHODCALLTYPE Next(unsigned int count, SOSStackRefError ref[], unsigned int *pFetched);

private:
    // The lifetime of the error list is tied to the enum, so we must addref/release it.
    DacStackReferenceWalker *mEnum;
    SOSStackErrorList *mHead;
    SOSStackErrorList *mCurr;
};

// For GCCONTEXT
#include "gcenv.h"


template <class T>
class DacReferenceList
{
    public:
        DacReferenceList()
            : _array(0), _count(0), _capacity(0)
        {
        }

        ~DacReferenceList()
        {
            if (_array)
                delete[] _array;
        }

        bool Add(const T& value)
        {
            if (_count == _capacity)
            {
                unsigned int newCapacity = (int)(_capacity * 1.5);
                if (newCapacity < 256)
                    newCapacity = 256;

                T* newArray = new (nothrow) T[newCapacity];
                if (!newArray)
                    return false;

                if (_array)
                {
                    memcpy(newArray, _array, _capacity * sizeof(T));
                    delete[] _array;
                }

                _array = newArray;
                _capacity = newCapacity;
            }

            _array[_count++] = value;
            return true;
        }

        unsigned int GetCount() const
        {
            return _count;
        }

        const T& Get(unsigned int index) const
        {
            _ASSERTE(index < _count);
            return _array[index];
        }

        void Clear()
        {
            _count = 0;
        }

    private:
        T *_array;
        unsigned int _count;
        unsigned int _capacity;
};


class DacMemoryEnumerator : public DefaultCOMImpl<ISOSMemoryEnum, IID_ISOSMemoryEnum>
{
public:
    DacMemoryEnumerator()
        : mIteratorIndex(0)
    {
    }

    virtual ~DacMemoryEnumerator() {}
    virtual HRESULT Init() = 0;

    HRESULT STDMETHODCALLTYPE Skip(unsigned int count);
    HRESULT STDMETHODCALLTYPE Reset();
    HRESULT STDMETHODCALLTYPE GetCount(unsigned int *pCount);
    HRESULT STDMETHODCALLTYPE Next(unsigned int count,
                                   SOSMemoryRegion regions[],
                                   unsigned int *pFetched);

protected:
    DacReferenceList<SOSMemoryRegion> mRegions;

private:
    unsigned int mIteratorIndex;
};

class DacMethodTableSlotEnumerator : public DefaultCOMImpl<ISOSMethodEnum, IID_ISOSMethodEnum>
{
public:
    DacMethodTableSlotEnumerator() : mIteratorIndex(0)
    {
    }

    virtual ~DacMethodTableSlotEnumerator() {}

    HRESULT Init(PTR_MethodTable mTable);

    HRESULT STDMETHODCALLTYPE Skip(unsigned int count);
    HRESULT STDMETHODCALLTYPE Reset();
    HRESULT STDMETHODCALLTYPE GetCount(unsigned int *pCount);
    HRESULT STDMETHODCALLTYPE Next(unsigned int count, SOSMethodData methods[], unsigned int *pFetched);

protected:
    DacReferenceList<SOSMethodData> mMethods;

private:
    unsigned int mIteratorIndex;
};

class DacHandleTableMemoryEnumerator : public DacMemoryEnumerator
{
public:
    virtual HRESULT Init();
};

class DacGCBookkeepingEnumerator : public DacMemoryEnumerator
{
public:
    virtual HRESULT Init();
};

class DacFreeRegionEnumerator : public DacMemoryEnumerator
{
public:
    virtual HRESULT Init();

private:
    void AddSingleSegment(const dac_heap_segment &seg, FreeRegionKind kind, int heap);
    void AddSegmentList(DPTR(dac_heap_segment) seg, FreeRegionKind kind, int heap = 0);
    void AddFreeList(DPTR(dac_region_free_list) freeList, FreeRegionKind kind);
    void AddServerRegions();
};

struct DacGcReference;
 /* DacStackReferenceWalker.
 */
class DacStackReferenceWalker : public DefaultCOMImpl<ISOSStackRefEnum, IID_ISOSStackRefEnum>
{
    struct DacScanContext : public ScanContext
    {
        DacStackReferenceWalker *pWalker;
        DacReferenceList<SOSStackRefData> *pList;
        Frame *pFrame;
        TADDR sp, pc;
        bool stop;
        bool resolvePointers;
        GCEnumCallback pEnumFunc;

        DacScanContext(DacStackReferenceWalker *walker, DacReferenceList<SOSStackRefData> *list, bool resolveInteriorPointers)
            : pWalker(walker), pList(list), pFrame(0), sp(0), pc(0), stop(false), resolvePointers(resolveInteriorPointers), pEnumFunc(0)
        {
            _ASSERTE(pWalker);
            _ASSERTE(pList);
        }
    };

public:
    DacStackReferenceWalker(ClrDataAccess *dac, DWORD osThreadID, bool resolveInteriorPointers);

    HRESULT Init();

    HRESULT STDMETHODCALLTYPE Skip(unsigned int count);
    HRESULT STDMETHODCALLTYPE Reset();
    HRESULT STDMETHODCALLTYPE GetCount(unsigned int *pCount);
    HRESULT STDMETHODCALLTYPE Next(unsigned int count,
                                   SOSStackRefData refs[],
                                   unsigned int *pFetched);

   // Dac-Dbi Functions
   HRESULT Next(ULONG celt, DacGcReference roots[], ULONG *pceltFetched);
   Thread *GetThread() const
   {
        return mThread;
   }

    HRESULT STDMETHODCALLTYPE EnumerateErrors(ISOSStackRefErrorEnum **ppEnum);

private:
    static StackWalkAction Callback(CrawlFrame *pCF, VOID *pData);
    static void GCEnumCallbackFunc(LPVOID hCallback, OBJECTREF *pObject, uint32_t flags, DacSlotLocation loc);
    static void GCReportCallback(PTR_PTR_Object ppObj, ScanContext *sc, uint32_t flags);

    CLRDATA_ADDRESS ReadPointer(TADDR addr);

    void WalkStack();

private:
    // Dac variables required for entering/leaving the dac.
    ClrDataAccess *mDac;
    ULONG32 m_instanceAge;

    // Storage
    DacReferenceList<SOSStackRefData> mList;

    // Operational variables
    Thread *mThread;
    SOSStackErrorList *mErrors;
    bool mResolvePointers;
    bool mEnumerated;

    // Iterator variables
    unsigned int mIteratorIndex;

    // Heap.  Used to resolve interior pointers.
    DacHeapWalker mHeap;
};

class DacHandleWalker : public DefaultCOMImpl<ISOSHandleEnum, IID_ISOSHandleEnum>
{
    // Parameter used in HndEnumHandles callback.
    struct DacHandleWalkerParam
    {
        DacReferenceList<SOSHandleData> *List; // The list to write to.
        HRESULT Result;                        // HRESULT of the current enumeration
        CLRDATA_ADDRESS AppDomain;             // The AppDomain for the current bucket we are walking
        unsigned int Type;                     // The type of handle we are currently walking

        DacHandleWalkerParam(DacReferenceList<SOSHandleData> *list)
            : List(list), Result(S_OK), AppDomain(0), Type(0)
        {
            _ASSERTE(list);
        }
    };

public:
    DacHandleWalker();
    virtual ~DacHandleWalker();

    HRESULT Init(ClrDataAccess *dac, UINT types[], UINT typeCount);
    HRESULT Init(ClrDataAccess *dac, UINT types[], UINT typeCount, int gen);
    HRESULT Init(UINT32 typemask);

    // SOS functions
    HRESULT STDMETHODCALLTYPE Skip(unsigned int count);
    HRESULT STDMETHODCALLTYPE Reset();
    HRESULT STDMETHODCALLTYPE GetCount(unsigned int *pCount);
    HRESULT STDMETHODCALLTYPE Next(unsigned int count,
                                   SOSHandleData handles[],
                                   unsigned int *pNeeded);

   // Dac-Dbi Functions
   HRESULT Next(ULONG celt, DacGcReference roots[], ULONG *pceltFetched);
private:
    static void CALLBACK EnumCallback(PTR_UNCHECKED_OBJECTREF pref, uintptr_t *pExtraInfo, uintptr_t userParam, uintptr_t type);
    static void GetRefCountedHandleInfo(
        OBJECTREF oref, unsigned int uType,
        unsigned int *pRefCount, unsigned int *pJupiterRefCount, BOOL *pIsPegged, BOOL *pIsStrong);
    static UINT32 BuildTypemask(UINT types[], UINT typeCount);

private:
    void WalkHandles();
    static inline bool IsAlwaysStrongReference(unsigned int type)
    {
        return type == HNDTYPE_STRONG || type == HNDTYPE_PINNED;
    }

private:
    // Dac variables required for entering/leaving the dac.
    ClrDataAccess *mDac;
    ULONG32 m_instanceAge;

    // Handle table walking variables.
    UINT32 mTypeMask;
    int mGenerationFilter;

    // Storage variables
    DacReferenceList<SOSHandleData> mList;
    bool mEnumerated;

    // Iterator variables
    unsigned int mIteratorIndex;
};


//----------------------------------------------------------------------------
//
// ClrDataAppDomain.
//
//----------------------------------------------------------------------------

class ClrDataAppDomain : public IXCLRDataAppDomain
{
public:
    ClrDataAppDomain(ClrDataAccess* dac,
                     AppDomain* appDomain);
    virtual ~ClrDataAppDomain(void);

    // IUnknown.
    STDMETHOD(QueryInterface)(THIS_
                              IN REFIID interfaceId,
                              OUT PVOID* iface);
    STDMETHOD_(ULONG, AddRef)(THIS);
    STDMETHOD_(ULONG, Release)(THIS);

    //
    // IXCLRDataAppDomain.
    //

    virtual HRESULT STDMETHODCALLTYPE GetProcess(
        /* [out] */ IXCLRDataProcess **process);

    virtual HRESULT STDMETHODCALLTYPE GetName(
        /* [in] */ ULONG32 bufLen,
        /* [out] */ ULONG32 *nameLen,
        /* [size_is][out] */ _Out_writes_to_opt_(bufLen, *nameLen) WCHAR name[  ]);

    virtual HRESULT STDMETHODCALLTYPE GetUniqueID(
        /* [out] */ ULONG64 *id);

    virtual HRESULT STDMETHODCALLTYPE GetFlags(
        /* [out] */ ULONG32 *flags);

    virtual HRESULT STDMETHODCALLTYPE IsSameObject(
        /* [in] */ IXCLRDataAppDomain *appDomain);

    virtual HRESULT STDMETHODCALLTYPE GetManagedObject(
        /* [out] */ IXCLRDataValue **value);

    virtual HRESULT STDMETHODCALLTYPE Request(
        /* [in] */ ULONG32 reqCode,
        /* [in] */ ULONG32 inBufferSize,
        /* [size_is][in] */ BYTE *inBuffer,
        /* [in] */ ULONG32 outBufferSize,
        /* [size_is][out] */ BYTE *outBuffer);

    AppDomain* GetAppDomain(void)
    {
        SUPPORTS_DAC;
        return m_appDomain;
    }

private:
    LONG m_refs;
    ClrDataAccess* m_dac;
    ULONG32 m_instanceAge;
    AppDomain* m_appDomain;
};

//----------------------------------------------------------------------------
//
// ClrDataAssembly.
//
//----------------------------------------------------------------------------

class ClrDataAssembly : public IXCLRDataAssembly
{
public:
    ClrDataAssembly(ClrDataAccess* dac,
                    Assembly* assembly);
    virtual ~ClrDataAssembly(void);

    // IUnknown.
    STDMETHOD(QueryInterface)(THIS_
                              IN REFIID interfaceId,
                              OUT PVOID* iface);
    STDMETHOD_(ULONG, AddRef)(THIS);
    STDMETHOD_(ULONG, Release)(THIS);

    //
    // IXCLRDataAssembly.
    //

    virtual HRESULT STDMETHODCALLTYPE StartEnumModules(
        /* [out] */ CLRDATA_ENUM *handle);

    virtual HRESULT STDMETHODCALLTYPE EnumModule(
        /* [in, out] */ CLRDATA_ENUM* handle,
        /* [out] */ IXCLRDataModule **mod);

    virtual HRESULT STDMETHODCALLTYPE EndEnumModules(
        /* [in] */ CLRDATA_ENUM handle);

    virtual HRESULT STDMETHODCALLTYPE StartEnumAppDomains(
        /* [out] */ CLRDATA_ENUM *handle);

    virtual HRESULT STDMETHODCALLTYPE EnumAppDomain(
        /* [in, out] */ CLRDATA_ENUM* handle,
        /* [out] */ IXCLRDataAppDomain **appDomain);

    virtual HRESULT STDMETHODCALLTYPE EndEnumAppDomains(
        /* [in] */ CLRDATA_ENUM handle);

    virtual HRESULT STDMETHODCALLTYPE GetName(
        /* [in] */ ULONG32 bufLen,
        /* [out] */ ULONG32 *nameLen,
        /* [size_is][out] */ _Out_writes_to_opt_(bufLen, *nameLen) WCHAR name[  ]);

    virtual HRESULT STDMETHODCALLTYPE GetFileName(
        /* [in] */ ULONG32 bufLen,
        /* [out] */ ULONG32 *nameLen,
        /* [size_is][out] */ _Out_writes_to_opt_(bufLen, *nameLen) WCHAR name[  ]);

    virtual HRESULT STDMETHODCALLTYPE GetDisplayName(
        /* [in] */ ULONG32 bufLen,
        /* [out] */ ULONG32 *nameLen,
        /* [size_is][out] */ _Out_writes_to_opt_(bufLen, *nameLen) WCHAR name[  ]);

    virtual HRESULT STDMETHODCALLTYPE GetFlags(
        /* [out] */ ULONG32 *flags);

    virtual HRESULT STDMETHODCALLTYPE IsSameObject(
        /* [in] */ IXCLRDataAssembly *assembly);

    virtual HRESULT STDMETHODCALLTYPE Request(
        /* [in] */ ULONG32 reqCode,
        /* [in] */ ULONG32 inBufferSize,
        /* [size_is][in] */ BYTE *inBuffer,
        /* [in] */ ULONG32 outBufferSize,
        /* [size_is][out] */ BYTE *outBuffer);

private:
    LONG m_refs;
    ClrDataAccess* m_dac;
    ULONG32 m_instanceAge;
    Assembly* m_assembly;
};

//----------------------------------------------------------------------------
//
// ClrDataModule.
//
//----------------------------------------------------------------------------

class ClrDataModule : public IXCLRDataModule, IXCLRDataModule2
{
public:
    ClrDataModule(ClrDataAccess* dac,
                  Module* module);
    virtual ~ClrDataModule(void);

    // IUnknown.
    STDMETHOD(QueryInterface)(THIS_
                              IN REFIID interfaceId,
                              OUT PVOID* iface);
    STDMETHOD_(ULONG, AddRef)(THIS);
    STDMETHOD_(ULONG, Release)(THIS);

    //
    // IXCLRDataModule.
    //

    virtual HRESULT STDMETHODCALLTYPE StartEnumAssemblies(
        /* [out] */ CLRDATA_ENUM *handle);

    virtual HRESULT STDMETHODCALLTYPE EnumAssembly(
        /* [in, out] */ CLRDATA_ENUM* handle,
        /* [out] */ IXCLRDataAssembly **assembly);

    virtual HRESULT STDMETHODCALLTYPE EndEnumAssemblies(
        /* [in] */ CLRDATA_ENUM handle);

    virtual HRESULT STDMETHODCALLTYPE StartEnumAppDomains(
        /* [out] */ CLRDATA_ENUM *handle);

    virtual HRESULT STDMETHODCALLTYPE EnumAppDomain(
        /* [in, out] */ CLRDATA_ENUM* handle,
        /* [out] */ IXCLRDataAppDomain **appDomain);

    virtual HRESULT STDMETHODCALLTYPE EndEnumAppDomains(
        /* [in] */ CLRDATA_ENUM handle);

    virtual HRESULT STDMETHODCALLTYPE StartEnumTypeDefinitions(
        /* [out] */ CLRDATA_ENUM *handle);

    virtual HRESULT STDMETHODCALLTYPE EnumTypeDefinition(
        /* [in, out] */ CLRDATA_ENUM* handle,
        /* [out] */ IXCLRDataTypeDefinition **typeDefinition);

    virtual HRESULT STDMETHODCALLTYPE EndEnumTypeDefinitions(
        /* [in] */ CLRDATA_ENUM handle);

    virtual HRESULT STDMETHODCALLTYPE StartEnumTypeInstances(
        /* [in] */ IXCLRDataAppDomain* appDomain,
        /* [out] */ CLRDATA_ENUM *handle);

    virtual HRESULT STDMETHODCALLTYPE EnumTypeInstance(
        /* [in, out] */ CLRDATA_ENUM* handle,
        /* [out] */ IXCLRDataTypeInstance **typeInstance);

    virtual HRESULT STDMETHODCALLTYPE EndEnumTypeInstances(
        /* [in] */ CLRDATA_ENUM handle);

    virtual HRESULT STDMETHODCALLTYPE StartEnumTypeDefinitionsByName(
        /* [in] */ LPCWSTR name,
        /* [in] */ ULONG32 flags,
        /* [out] */ CLRDATA_ENUM *handle);

    virtual HRESULT STDMETHODCALLTYPE EnumTypeDefinitionByName(
        /* [out][in] */ CLRDATA_ENUM *handle,
        /* [out] */ IXCLRDataTypeDefinition **type);

    virtual HRESULT STDMETHODCALLTYPE EndEnumTypeDefinitionsByName(
        /* [in] */ CLRDATA_ENUM handle);

    virtual HRESULT STDMETHODCALLTYPE StartEnumTypeInstancesByName(
        /* [in] */ LPCWSTR name,
        /* [in] */ ULONG32 flags,
        /* [in] */ IXCLRDataAppDomain *appDomain,
        /* [out] */ CLRDATA_ENUM *handle);

    virtual HRESULT STDMETHODCALLTYPE EnumTypeInstanceByName(
        /* [out][in] */ CLRDATA_ENUM *handle,
        /* [out] */ IXCLRDataTypeInstance **type);

    virtual HRESULT STDMETHODCALLTYPE EndEnumTypeInstancesByName(
        /* [in] */ CLRDATA_ENUM handle);

    virtual HRESULT STDMETHODCALLTYPE GetTypeDefinitionByToken(
        /* [in] */ mdTypeDef token,
        /* [out] */ IXCLRDataTypeDefinition **typeDefinition);

    virtual HRESULT STDMETHODCALLTYPE StartEnumMethodDefinitionsByName(
        /* [in] */ LPCWSTR name,
        /* [in] */ ULONG32 flags,
        /* [out] */ CLRDATA_ENUM *handle);

    virtual HRESULT STDMETHODCALLTYPE EnumMethodDefinitionByName(
        /* [in] */ CLRDATA_ENUM* handle,
        /* [out] */ IXCLRDataMethodDefinition **method);

    virtual HRESULT STDMETHODCALLTYPE EndEnumMethodDefinitionsByName(
        /* [in] */ CLRDATA_ENUM handle);

    virtual HRESULT STDMETHODCALLTYPE StartEnumMethodInstancesByName(
        /* [in] */ LPCWSTR name,
        /* [in] */ ULONG32 flags,
        /* [in] */ IXCLRDataAppDomain* appDomain,
        /* [out] */ CLRDATA_ENUM *handle);

    virtual HRESULT STDMETHODCALLTYPE EnumMethodInstanceByName(
        /* [in] */ CLRDATA_ENUM* handle,
        /* [out] */ IXCLRDataMethodInstance **method);

    virtual HRESULT STDMETHODCALLTYPE EndEnumMethodInstancesByName(
        /* [in] */ CLRDATA_ENUM handle);

    virtual HRESULT STDMETHODCALLTYPE GetMethodDefinitionByToken(
        /* [in] */ mdMethodDef token,
        /* [out] */ IXCLRDataMethodDefinition **methodDefinition);

    virtual HRESULT STDMETHODCALLTYPE StartEnumDataByName(
        /* [in] */ LPCWSTR name,
        /* [in] */ ULONG32 flags,
        /* [in] */ IXCLRDataAppDomain* appDomain,
        /* [in] */ IXCLRDataTask* tlsTask,
        /* [out] */ CLRDATA_ENUM *handle);

    virtual HRESULT STDMETHODCALLTYPE EnumDataByName(
        /* [in] */ CLRDATA_ENUM* handle,
        /* [out] */ IXCLRDataValue **value);

    virtual HRESULT STDMETHODCALLTYPE EndEnumDataByName(
        /* [in] */ CLRDATA_ENUM handle);

    virtual HRESULT STDMETHODCALLTYPE GetName(
        /* [in] */ ULONG32 bufLen,
        /* [out] */ ULONG32 *nameLen,
        /* [size_is][out] */ _Out_writes_to_opt_(bufLen, *nameLen) WCHAR name[  ]);

    virtual HRESULT STDMETHODCALLTYPE GetFileName(
        /* [in] */ ULONG32 bufLen,
        /* [out] */ ULONG32 *nameLen,
        /* [size_is][out] */ _Out_writes_to_opt_(bufLen, *nameLen) WCHAR name[  ]);

    virtual HRESULT STDMETHODCALLTYPE GetVersionId(
        /* [out] */ GUID* vid);

    virtual HRESULT STDMETHODCALLTYPE GetFlags(
        /* [out] */ ULONG32 *flags);

    virtual HRESULT STDMETHODCALLTYPE IsSameObject(
        /* [in] */ IXCLRDataModule *mod);

    virtual HRESULT STDMETHODCALLTYPE StartEnumExtents(
        /* [out] */ CLRDATA_ENUM *handle);

    virtual HRESULT STDMETHODCALLTYPE EnumExtent(
        /* [in, out] */ CLRDATA_ENUM* handle,
        /* [out] */ CLRDATA_MODULE_EXTENT *extent);

    virtual HRESULT STDMETHODCALLTYPE EndEnumExtents(
        /* [in] */ CLRDATA_ENUM handle);

    virtual HRESULT STDMETHODCALLTYPE Request(
        /* [in] */ ULONG32 reqCode,
        /* [in] */ ULONG32 inBufferSize,
        /* [size_is][in] */ BYTE *inBuffer,
        /* [in] */ ULONG32 outBufferSize,
        /* [size_is][out] */ BYTE *outBuffer);

    HRESULT RequestGetModulePtr(IN ULONG32 inBufferSize,
                                IN BYTE* inBuffer,
                                IN ULONG32 outBufferSize,
                                OUT BYTE* outBuffer);

    HRESULT RequestGetModuleData(IN ULONG32 inBufferSize,
                                 IN BYTE* inBuffer,
                                 IN ULONG32 outBufferSize,
                                 OUT BYTE* outBuffer);

    Module* GetModule(void)
    {
        return m_module;
    }

    //
    // IXCLRDataModule2
    //
    virtual HRESULT STDMETHODCALLTYPE SetJITCompilerFlags(
        /* [in] */ DWORD dwFlags );

private:
    // Returns an instance of IID_IMetaDataImport.
    HRESULT GetMdInterface(PVOID* retIface);

    LONG m_refs;
    ClrDataAccess* m_dac;
    ULONG32 m_instanceAge;
    Module* m_module;
    IMetaDataImport* m_mdImport;
    bool m_setExtents;
    CLRDATA_MODULE_EXTENT m_extents[2];
    CLRDATA_MODULE_EXTENT* m_extentsEnd;
};

//----------------------------------------------------------------------------
//
// ClrDataTypeDefinition.
//
//----------------------------------------------------------------------------

class ClrDataTypeDefinition : public IXCLRDataTypeDefinition
{
public:
    ClrDataTypeDefinition(ClrDataAccess* dac,
                          Module* module,
                          mdTypeDef token,
                          TypeHandle typeHandle);
    virtual ~ClrDataTypeDefinition(void);

    // IUnknown.
    STDMETHOD(QueryInterface)(THIS_
                              IN REFIID interfaceId,
                              OUT PVOID* iface);
    STDMETHOD_(ULONG, AddRef)(THIS);
    STDMETHOD_(ULONG, Release)(THIS);

    //
    // IXCLRDataTypeDefinition.
    //

    virtual HRESULT STDMETHODCALLTYPE GetModule(
        /* [out] */ IXCLRDataModule **mod);

    virtual HRESULT STDMETHODCALLTYPE StartEnumMethodDefinitions(
        /* [out] */ CLRDATA_ENUM *handle);

    virtual HRESULT STDMETHODCALLTYPE EnumMethodDefinition(
        /* [in, out] */ CLRDATA_ENUM* handle,
        /* [out] */ IXCLRDataMethodDefinition **methodDefinition);

    virtual HRESULT STDMETHODCALLTYPE EndEnumMethodDefinitions(
        /* [in] */ CLRDATA_ENUM handle);

    virtual HRESULT STDMETHODCALLTYPE StartEnumMethodDefinitionsByName(
        /* [in] */ LPCWSTR name,
        /* [in] */ ULONG32 flags,
        /* [out] */ CLRDATA_ENUM *handle);

    virtual HRESULT STDMETHODCALLTYPE EnumMethodDefinitionByName(
        /* [in] */ CLRDATA_ENUM* handle,
        /* [out] */ IXCLRDataMethodDefinition **method);

    virtual HRESULT STDMETHODCALLTYPE EndEnumMethodDefinitionsByName(
        /* [in] */ CLRDATA_ENUM handle);

    virtual HRESULT STDMETHODCALLTYPE GetMethodDefinitionByToken(
        /* [in] */ mdMethodDef token,
        /* [out] */ IXCLRDataMethodDefinition **methodDefinition);

    virtual HRESULT STDMETHODCALLTYPE StartEnumInstances(
        /* [in] */ IXCLRDataAppDomain* appDomain,
        /* [out] */ CLRDATA_ENUM *handle);

    virtual HRESULT STDMETHODCALLTYPE EnumInstance(
        /* [out][in] */ CLRDATA_ENUM *handle,
        /* [out] */ IXCLRDataTypeInstance **instance);

    virtual HRESULT STDMETHODCALLTYPE EndEnumInstances(
        /* [in] */ CLRDATA_ENUM handle);

    virtual HRESULT STDMETHODCALLTYPE GetNumFields(
        /* [in] */ ULONG32 flags,
        /* [out] */ ULONG32 *numFields);

    virtual HRESULT STDMETHODCALLTYPE StartEnumFields(
        /* [in] */ ULONG32 flags,
        /* [out] */ CLRDATA_ENUM *handle);

    virtual HRESULT STDMETHODCALLTYPE EnumField(
        /* [out][in] */ CLRDATA_ENUM *handle,
        /* [in] */ ULONG32 nameBufLen,
        /* [out] */ ULONG32 *nameLen,
        /* [size_is][out] */ _Out_writes_to_opt_(nameBufLen, *nameLen) WCHAR nameBuf[  ],
        /* [out] */ IXCLRDataTypeDefinition **type,
        /* [out] */ ULONG32 *flags,
        /* [out] */ mdFieldDef *token);

    virtual HRESULT STDMETHODCALLTYPE EnumField2(
        /* [out][in] */ CLRDATA_ENUM *handle,
        /* [in] */ ULONG32 nameBufLen,
        /* [out] */ ULONG32 *nameLen,
        /* [size_is][out] */ _Out_writes_to_opt_(nameBufLen, *nameLen) WCHAR nameBuf[  ],
        /* [out] */ IXCLRDataTypeDefinition **type,
        /* [out] */ ULONG32 *flags,
        /* [out] */ IXCLRDataModule** tokenScope,
        /* [out] */ mdFieldDef *token);

    virtual HRESULT STDMETHODCALLTYPE EndEnumFields(
        /* [in] */ CLRDATA_ENUM handle);

    virtual HRESULT STDMETHODCALLTYPE StartEnumFieldsByName(
        /* [in] */ LPCWSTR name,
        /* [in] */ ULONG32 nameFlags,
        /* [in] */ ULONG32 fieldFlags,
        /* [out] */ CLRDATA_ENUM *handle);

    virtual HRESULT STDMETHODCALLTYPE EnumFieldByName(
        /* [out][in] */ CLRDATA_ENUM *handle,
        /* [out] */ IXCLRDataTypeDefinition **type,
        /* [out] */ ULONG32 *flags,
        /* [out] */ mdFieldDef *token);

    virtual HRESULT STDMETHODCALLTYPE EnumFieldByName2(
        /* [out][in] */ CLRDATA_ENUM *handle,
        /* [out] */ IXCLRDataTypeDefinition **type,
        /* [out] */ ULONG32 *flags,
        /* [out] */ IXCLRDataModule** tokenScope,
        /* [out] */ mdFieldDef *token);

    virtual HRESULT STDMETHODCALLTYPE EndEnumFieldsByName(
        /* [in] */ CLRDATA_ENUM handle);

    virtual HRESULT STDMETHODCALLTYPE GetFieldByToken(
        /* [in] */ mdFieldDef token,
        /* [in] */ ULONG32 nameBufLen,
        /* [out] */ ULONG32 *nameLen,
        /* [size_is][out] */ _Out_writes_to_opt_(nameBufLen, *nameLen) WCHAR nameBuf[  ],
        /* [out] */ IXCLRDataTypeDefinition **type,
        /* [out] */ ULONG32* flags);

    virtual HRESULT STDMETHODCALLTYPE GetFieldByToken2(
        /* [in] */ IXCLRDataModule* tokenScope,
        /* [in] */ mdFieldDef token,
        /* [in] */ ULONG32 nameBufLen,
        /* [out] */ ULONG32 *nameLen,
        /* [size_is][out] */ _Out_writes_to_opt_(nameBufLen, *nameLen) WCHAR nameBuf[  ],
        /* [out] */ IXCLRDataTypeDefinition **type,
        /* [out] */ ULONG32* flags);

    virtual HRESULT STDMETHODCALLTYPE GetName(
        /* [in] */ ULONG32 flags,
        /* [in] */ ULONG32 bufLen,
        /* [out] */ ULONG32 *nameLen,
        /* [size_is][out] */ _Out_writes_to_opt_(bufLen, *nameLen) WCHAR nameBuf[  ]);

    virtual HRESULT STDMETHODCALLTYPE GetTokenAndScope(
        /* [out] */ mdTypeDef *token,
        /* [out] */ IXCLRDataModule **mod);

    virtual HRESULT STDMETHODCALLTYPE GetCorElementType(
        /* [out] */ CorElementType *type);

    virtual HRESULT STDMETHODCALLTYPE GetFlags(
        /* [out] */ ULONG32 *flags);

    virtual HRESULT STDMETHODCALLTYPE GetBase(
        /* [out] */ IXCLRDataTypeDefinition **base);

    virtual HRESULT STDMETHODCALLTYPE IsSameObject(
        /* [in] */ IXCLRDataTypeDefinition *type);

    virtual HRESULT STDMETHODCALLTYPE Request(
        /* [in] */ ULONG32 reqCode,
        /* [in] */ ULONG32 inBufferSize,
        /* [size_is][in] */ BYTE *inBuffer,
        /* [in] */ ULONG32 outBufferSize,
        /* [size_is][out] */ BYTE *outBuffer);

    virtual HRESULT STDMETHODCALLTYPE GetArrayRank(
        /* [out] */ ULONG32* rank);

    virtual HRESULT STDMETHODCALLTYPE GetTypeNotification(
        /* [out] */ ULONG32* flags);

    virtual HRESULT STDMETHODCALLTYPE SetTypeNotification(
        /* [in] */ ULONG32 flags);

    static HRESULT NewFromModule(ClrDataAccess* dac,
                                 Module* module,
                                 mdTypeDef token,
                                 ClrDataTypeDefinition** typeDef,
                                 IXCLRDataTypeDefinition** pubTypeDef);

    TypeHandle GetTypeHandle(void)
    {
        return m_typeHandle;
    }

private:
    LONG m_refs;
    ClrDataAccess* m_dac;
    ULONG32 m_instanceAge;
    Module* m_module;
    mdTypeDef m_token;
    TypeHandle m_typeHandle;
};

//----------------------------------------------------------------------------
//
// ClrDataTypeInstance.
//
//----------------------------------------------------------------------------

class ClrDataTypeInstance : public IXCLRDataTypeInstance
{
public:
    ClrDataTypeInstance(ClrDataAccess* dac,
                        AppDomain* appDomain,
                        TypeHandle typeHandle);
    virtual ~ClrDataTypeInstance(void);

    // IUnknown.
    STDMETHOD(QueryInterface)(THIS_
                              IN REFIID interfaceId,
                              OUT PVOID* iface);
    STDMETHOD_(ULONG, AddRef)(THIS);
    STDMETHOD_(ULONG, Release)(THIS);

    //
    // IXCLRDataTypeInstance.
    //

    virtual HRESULT STDMETHODCALLTYPE StartEnumMethodInstances(
        /* [out] */ CLRDATA_ENUM *handle);

    virtual HRESULT STDMETHODCALLTYPE EnumMethodInstance(
        /* [in, out] */ CLRDATA_ENUM* handle,
        /* [out] */ IXCLRDataMethodInstance **methodInstance);

    virtual HRESULT STDMETHODCALLTYPE EndEnumMethodInstances(
        /* [in] */ CLRDATA_ENUM handle);

    virtual HRESULT STDMETHODCALLTYPE StartEnumMethodInstancesByName(
        /* [in] */ LPCWSTR name,
        /* [in] */ ULONG32 flags,
        /* [out] */ CLRDATA_ENUM *handle);

    virtual HRESULT STDMETHODCALLTYPE EnumMethodInstanceByName(
        /* [in] */ CLRDATA_ENUM* handle,
        /* [out] */ IXCLRDataMethodInstance **method);

    virtual HRESULT STDMETHODCALLTYPE EndEnumMethodInstancesByName(
        /* [in] */ CLRDATA_ENUM handle);

    virtual HRESULT STDMETHODCALLTYPE GetNumStaticFields(
        /* [out] */ ULONG32 *numFields);

    virtual HRESULT STDMETHODCALLTYPE GetStaticFieldByIndex(
        /* [in] */ ULONG32 index,
        /* [in] */ IXCLRDataTask *tlsTask,
        /* [out] */ IXCLRDataValue **field,
        /* [in] */ ULONG32 bufLen,
        /* [out] */ ULONG32 *nameLen,
        /* [size_is][out] */ _Out_writes_to_opt_(bufLen, *nameLen) WCHAR nameBuf[  ],
        /* [out] */ mdFieldDef *token);

    virtual HRESULT STDMETHODCALLTYPE StartEnumStaticFieldsByName(
        /* [in] */ LPCWSTR name,
        /* [in] */ ULONG32 flags,
        /* [in] */ IXCLRDataTask *tlsTask,
        /* [out] */ CLRDATA_ENUM *handle);

    virtual HRESULT STDMETHODCALLTYPE EnumStaticFieldByName(
        /* [out][in] */ CLRDATA_ENUM *handle,
        /* [out] */ IXCLRDataValue **value);

    virtual HRESULT STDMETHODCALLTYPE EndEnumStaticFieldsByName(
        /* [in] */ CLRDATA_ENUM handle);

    virtual HRESULT STDMETHODCALLTYPE GetNumStaticFields2(
        /* [in] */ ULONG32 flags,
        /* [out] */ ULONG32 *numFields);

    virtual HRESULT STDMETHODCALLTYPE StartEnumStaticFields(
        /* [in] */ ULONG32 flags,
        /* [in] */ IXCLRDataTask *tlsTask,
        /* [out] */ CLRDATA_ENUM *handle);

    virtual HRESULT STDMETHODCALLTYPE EnumStaticField(
        /* [out][in] */ CLRDATA_ENUM *handle,
        /* [out] */ IXCLRDataValue **value);

    virtual HRESULT STDMETHODCALLTYPE EnumStaticField2(
        /* [out][in] */ CLRDATA_ENUM *handle,
        /* [out] */ IXCLRDataValue **value,
        /* [in] */ ULONG32 bufLen,
        /* [out] */ ULONG32 *nameLen,
        /* [size_is][out] */ _Out_writes_to_opt_(bufLen, *nameLen) WCHAR nameBuf[  ],
        /* [out] */ IXCLRDataModule** tokenScope,
        /* [out] */ mdFieldDef *token);

    virtual HRESULT STDMETHODCALLTYPE EndEnumStaticFields(
        /* [in] */ CLRDATA_ENUM handle);

    virtual HRESULT STDMETHODCALLTYPE StartEnumStaticFieldsByName2(
        /* [in] */ LPCWSTR name,
        /* [in] */ ULONG32 nameFlags,
        /* [in] */ ULONG32 fieldFlags,
        /* [in] */ IXCLRDataTask *tlsTask,
        /* [out] */ CLRDATA_ENUM *handle);

    virtual HRESULT STDMETHODCALLTYPE EnumStaticFieldByName3(
        /* [out][in] */ CLRDATA_ENUM *handle,
        /* [out] */ IXCLRDataValue **value,
        /* [out] */ IXCLRDataModule** tokenScope,
        /* [out] */ mdFieldDef *token);

    virtual HRESULT STDMETHODCALLTYPE EnumStaticFieldByName2(
        /* [out][in] */ CLRDATA_ENUM *handle,
        /* [out] */ IXCLRDataValue **value);

    virtual HRESULT STDMETHODCALLTYPE EndEnumStaticFieldsByName2(
        /* [in] */ CLRDATA_ENUM handle);

    virtual HRESULT STDMETHODCALLTYPE GetStaticFieldByToken(
        /* [in] */ mdFieldDef token,
        /* [in] */ IXCLRDataTask *tlsTask,
        /* [out] */ IXCLRDataValue **field,
        /* [in] */ ULONG32 bufLen,
        /* [out] */ ULONG32 *nameLen,
        /* [size_is][out] */ _Out_writes_to_opt_(bufLen, *nameLen) WCHAR nameBuf[  ]);

    virtual HRESULT STDMETHODCALLTYPE GetStaticFieldByToken2(
        /* [in] */ IXCLRDataModule* tokenScope,
        /* [in] */ mdFieldDef token,
        /* [in] */ IXCLRDataTask *tlsTask,
        /* [out] */ IXCLRDataValue **field,
        /* [in] */ ULONG32 bufLen,
        /* [out] */ ULONG32 *nameLen,
        /* [size_is][out] */ _Out_writes_to_opt_(bufLen, *nameLen) WCHAR nameBuf[  ]);

    virtual HRESULT STDMETHODCALLTYPE GetName(
        /* [in] */ ULONG32 flags,
        /* [in] */ ULONG32 bufLen,
        /* [out] */ ULONG32 *nameLen,
        /* [size_is][out] */ _Out_writes_to_opt_(bufLen, *nameLen) WCHAR nameBuf[  ]);

    virtual HRESULT STDMETHODCALLTYPE GetModule(
        /* [out] */ IXCLRDataModule **mod);

    virtual HRESULT STDMETHODCALLTYPE GetDefinition(
        /* [out] */ IXCLRDataTypeDefinition **typeDefinition);

    virtual HRESULT STDMETHODCALLTYPE GetFlags(
        /* [out] */ ULONG32 *flags);

    virtual HRESULT STDMETHODCALLTYPE GetBase(
        /* [out] */ IXCLRDataTypeInstance **base);

    virtual HRESULT STDMETHODCALLTYPE IsSameObject(
        /* [in] */ IXCLRDataTypeInstance *type);

    virtual HRESULT STDMETHODCALLTYPE GetNumTypeArguments(
        /* [out] */ ULONG32 *numTypeArgs);

    virtual HRESULT STDMETHODCALLTYPE GetTypeArgumentByIndex(
        /* [in] */ ULONG32 index,
        /* [out] */ IXCLRDataTypeInstance **typeArg);

    virtual HRESULT STDMETHODCALLTYPE Request(
        /* [in] */ ULONG32 reqCode,
        /* [in] */ ULONG32 inBufferSize,
        /* [size_is][in] */ BYTE *inBuffer,
        /* [in] */ ULONG32 outBufferSize,
        /* [size_is][out] */ BYTE *outBuffer);

    static HRESULT NewFromModule(ClrDataAccess* dac,
                                 AppDomain* appDomain,
                                 Module* module,
                                 mdTypeDef token,
                                 ClrDataTypeInstance** typeInst,
                                 IXCLRDataTypeInstance** pubTypeInst);

    TypeHandle GetTypeHandle(void)
    {
        return m_typeHandle;
    }

private:
    LONG m_refs;
    ClrDataAccess* m_dac;
    ULONG32 m_instanceAge;
    AppDomain* m_appDomain;
    TypeHandle m_typeHandle;
};

//----------------------------------------------------------------------------
//
// ClrDataMethodDefinition.
//
//----------------------------------------------------------------------------

class ClrDataMethodDefinition : public IXCLRDataMethodDefinition
{
public:
    ClrDataMethodDefinition(ClrDataAccess* dac,
                            Module* module,
                            mdMethodDef token,
                            MethodDesc* methodDesc);
    virtual ~ClrDataMethodDefinition(void);

    // IUnknown.
    STDMETHOD(QueryInterface)(THIS_
                              IN REFIID interfaceId,
                              OUT PVOID* iface);
    STDMETHOD_(ULONG, AddRef)(THIS);
    STDMETHOD_(ULONG, Release)(THIS);

    //
    // IXCLRDataMethodDefinition.
    //

    virtual HRESULT STDMETHODCALLTYPE GetTypeDefinition(
        /* [out] */ IXCLRDataTypeDefinition **typeDefinition);

    virtual HRESULT STDMETHODCALLTYPE StartEnumInstances(
        /* [in] */ IXCLRDataAppDomain* appDomain,
        /* [out] */ CLRDATA_ENUM *handle);

    virtual HRESULT STDMETHODCALLTYPE EnumInstance(
        /* [out][in] */ CLRDATA_ENUM *handle,
        /* [out] */ IXCLRDataMethodInstance **instance);

    virtual HRESULT STDMETHODCALLTYPE EndEnumInstances(
        /* [in] */ CLRDATA_ENUM handle);

    virtual HRESULT STDMETHODCALLTYPE GetName(
        /* [in] */ ULONG32 flags,
        /* [in] */ ULONG32 bufLen,
        /* [out] */ ULONG32 *nameLen,
        /* [size_is][out] */ _Out_writes_to_opt_(bufLen, *nameLen) WCHAR name[  ]);

    virtual HRESULT STDMETHODCALLTYPE GetTokenAndScope(
        /* [out] */ mdMethodDef *token,
        /* [out] */ IXCLRDataModule **mod);

    virtual HRESULT STDMETHODCALLTYPE GetFlags(
        /* [out] */ ULONG32 *flags);

    virtual HRESULT STDMETHODCALLTYPE IsSameObject(
        /* [in] */ IXCLRDataMethodDefinition *method);

    virtual HRESULT STDMETHODCALLTYPE GetLatestEnCVersion(
        /* [out] */ ULONG32* version);

    virtual HRESULT STDMETHODCALLTYPE StartEnumExtents(
        /* [out] */ CLRDATA_ENUM *handle);

    virtual HRESULT STDMETHODCALLTYPE EnumExtent(
        /* [out][in] */ CLRDATA_ENUM *handle,
        /* [out] */ CLRDATA_METHDEF_EXTENT *extent);

    virtual HRESULT STDMETHODCALLTYPE EndEnumExtents(
        /* [in] */ CLRDATA_ENUM handle);

    virtual HRESULT STDMETHODCALLTYPE GetCodeNotification(
        /* [out] */ ULONG32 *flags);

    virtual HRESULT STDMETHODCALLTYPE SetCodeNotification(
        /* [in] */ ULONG32 flags);

    virtual HRESULT STDMETHODCALLTYPE GetRepresentativeEntryAddress(
        /* [out] */ CLRDATA_ADDRESS* addr);

    virtual HRESULT STDMETHODCALLTYPE HasClassOrMethodInstantiation(
        /*[out]*/ BOOL* bGeneric);

    virtual HRESULT STDMETHODCALLTYPE Request(
        /* [in] */ ULONG32 reqCode,
        /* [in] */ ULONG32 inBufferSize,
        /* [size_is][in] */ BYTE *inBuffer,
        /* [in] */ ULONG32 outBufferSize,
        /* [size_is][out] */ BYTE *outBuffer);

    COR_ILMETHOD* GetIlMethod(void);

    static HRESULT NewFromModule(ClrDataAccess* dac,
                                 Module* module,
                                 mdMethodDef token,
                                 ClrDataMethodDefinition** methDef,
                                 IXCLRDataMethodDefinition** pubMethDef);

    static HRESULT GetSharedMethodFlags(MethodDesc* methodDesc,
                                        ULONG32* flags);

    // We don't need this if we are able to form name using token
    MethodDesc *GetMethodDesc() { return m_methodDesc;}
private:
    LONG m_refs;
    ClrDataAccess* m_dac;
    ULONG32 m_instanceAge;
    Module* m_module;
    mdMethodDef m_token;
    MethodDesc* m_methodDesc;
};

//----------------------------------------------------------------------------
//
// ClrDataMethodInstance.
//
//----------------------------------------------------------------------------

class ClrDataMethodInstance : public IXCLRDataMethodInstance
{
public:
    ClrDataMethodInstance(ClrDataAccess* dac,
                          AppDomain* appDomain,
                          MethodDesc* methodDesc);
    virtual ~ClrDataMethodInstance(void);

    // IUnknown.
    STDMETHOD(QueryInterface)(THIS_
                              IN REFIID interfaceId,
                              OUT PVOID* iface);
    STDMETHOD_(ULONG, AddRef)(THIS);
    STDMETHOD_(ULONG, Release)(THIS);

    //
    // IXCLRDataMethodInstance.
    //

    virtual HRESULT STDMETHODCALLTYPE GetTypeInstance(
        /* [out] */ IXCLRDataTypeInstance **typeInstance);

    virtual HRESULT STDMETHODCALLTYPE GetDefinition(
        /* [out] */ IXCLRDataMethodDefinition **methodDefinition);

    virtual HRESULT STDMETHODCALLTYPE GetTokenAndScope(
        /* [out] */ mdMethodDef *token,
        /* [out] */ IXCLRDataModule **mod);

    virtual HRESULT STDMETHODCALLTYPE GetName(
        /* [in] */ ULONG32 flags,
        /* [in] */ ULONG32 bufLen,
        /* [out] */ ULONG32 *nameLen,
        /* [size_is][out] */ _Out_writes_to_opt_(bufLen, *nameLen) WCHAR name[  ]);

    virtual HRESULT STDMETHODCALLTYPE GetFlags(
        /* [out] */ ULONG32 *flags);

    virtual HRESULT STDMETHODCALLTYPE IsSameObject(
        /* [in] */ IXCLRDataMethodInstance *method);

    virtual HRESULT STDMETHODCALLTYPE GetEnCVersion(
        /* [out] */ ULONG32* version);

    virtual HRESULT STDMETHODCALLTYPE GetNumTypeArguments(
        /* [out] */ ULONG32 *numTypeArgs);

    virtual HRESULT STDMETHODCALLTYPE GetTypeArgumentByIndex(
        /* [in] */ ULONG32 index,
        /* [out] */ IXCLRDataTypeInstance **typeArg);

    virtual HRESULT STDMETHODCALLTYPE GetILOffsetsByAddress(
        /* [in] */ CLRDATA_ADDRESS address,
        /* [in] */ ULONG32 offsetsLen,
        /* [out] */ ULONG32 *offsetsNeeded,
        /* [size_is][out] */ ULONG32 ilOffsets[  ]);

    virtual HRESULT STDMETHODCALLTYPE GetAddressRangesByILOffset(
        /* [in] */ ULONG32 ilOffset,
        /* [in] */ ULONG32 rangesLen,
        /* [out] */ ULONG32 *rangesNeeded,
        /* [size_is][out] */ CLRDATA_ADDRESS_RANGE addressRanges[  ]);

    virtual HRESULT STDMETHODCALLTYPE GetILAddressMap(
        /* [in] */ ULONG32 mapLen,
        /* [out] */ ULONG32 *mapNeeded,
        /* [size_is][out] */ CLRDATA_IL_ADDRESS_MAP maps[  ]);

    virtual HRESULT STDMETHODCALLTYPE StartEnumExtents(
        /* [out] */ CLRDATA_ENUM *handle);

    virtual HRESULT STDMETHODCALLTYPE EnumExtent(
        /* [out][in] */ CLRDATA_ENUM *handle,
        /* [out] */ CLRDATA_ADDRESS_RANGE *extent);

    virtual HRESULT STDMETHODCALLTYPE EndEnumExtents(
        /* [in] */ CLRDATA_ENUM handle);

    virtual HRESULT STDMETHODCALLTYPE GetRepresentativeEntryAddress(
        /* [out] */ CLRDATA_ADDRESS* addr);

    virtual HRESULT STDMETHODCALLTYPE Request(
        /* [in] */ ULONG32 reqCode,
        /* [in] */ ULONG32 inBufferSize,
        /* [size_is][in] */ BYTE *inBuffer,
        /* [in] */ ULONG32 outBufferSize,
        /* [size_is][out] */ BYTE *outBuffer);

    static HRESULT NewFromModule(ClrDataAccess* dac,
                                 AppDomain* appDomain,
                                 Module* module,
                                 mdMethodDef token,
                                 ClrDataMethodInstance** methInst,
                                 IXCLRDataMethodInstance** pubMethInst);

private:
    friend class ClrDataAccess;
    LONG m_refs;
    ClrDataAccess* m_dac;
    ULONG32 m_instanceAge;
    AppDomain* m_appDomain;
    MethodDesc* m_methodDesc;
};

//----------------------------------------------------------------------------
//
// ClrDataTask.
//
//----------------------------------------------------------------------------

class ClrDataTask : public IXCLRDataTask
{
public:
    ClrDataTask(ClrDataAccess* dac,
                Thread* Thread);
    virtual ~ClrDataTask(void);

    // IUnknown.
    STDMETHOD(QueryInterface)(THIS_
                              IN REFIID interfaceId,
                              OUT PVOID* iface);
    STDMETHOD_(ULONG, AddRef)(THIS);
    STDMETHOD_(ULONG, Release)(THIS);

    //
    // IXCLRDataTask.
    //

    virtual HRESULT STDMETHODCALLTYPE GetProcess(
        /* [out] */ IXCLRDataProcess **process);

    virtual HRESULT STDMETHODCALLTYPE GetCurrentAppDomain(
        /* [out] */ IXCLRDataAppDomain **appDomain);

    virtual HRESULT STDMETHODCALLTYPE GetName(
        /* [in] */ ULONG32 bufLen,
        /* [out] */ ULONG32 *nameLen,
        /* [size_is][out] */ _Out_writes_to_opt_(bufLen, *nameLen) WCHAR name[  ]);

    virtual HRESULT STDMETHODCALLTYPE GetUniqueID(
        /* [out] */ ULONG64 *id);

    virtual HRESULT STDMETHODCALLTYPE GetFlags(
        /* [out] */ ULONG32 *flags);

    virtual HRESULT STDMETHODCALLTYPE IsSameObject(
        /* [in] */ IXCLRDataTask *task);

    virtual HRESULT STDMETHODCALLTYPE GetManagedObject(
        /* [out] */ IXCLRDataValue **value);

    virtual HRESULT STDMETHODCALLTYPE GetDesiredExecutionState(
        /* [out] */ ULONG32 *state);

    virtual HRESULT STDMETHODCALLTYPE SetDesiredExecutionState(
        /* [in] */ ULONG32 state);

    virtual HRESULT STDMETHODCALLTYPE CreateStackWalk(
        /* [in] */ ULONG32 flags,
        /* [out] */ IXCLRDataStackWalk **stackWalk);

    virtual HRESULT STDMETHODCALLTYPE GetOSThreadID(
        /* [out] */ ULONG32 *id);

    virtual HRESULT STDMETHODCALLTYPE GetContext(
        /* [in] */ ULONG32 contextFlags,
        /* [in] */ ULONG32 contextBufSize,
        /* [out] */ ULONG32 *contextSize,
        /* [size_is][out] */ BYTE contextBuf[  ]);

    virtual HRESULT STDMETHODCALLTYPE SetContext(
        /* [in] */ ULONG32 contextSize,
        /* [size_is][in] */ BYTE context[  ]);

    virtual HRESULT STDMETHODCALLTYPE GetCurrentExceptionState(
        /* [out] */ IXCLRDataExceptionState **exception);

    virtual HRESULT STDMETHODCALLTYPE GetLastExceptionState(
        /* [out] */ IXCLRDataExceptionState **exception);

    virtual HRESULT STDMETHODCALLTYPE Request(
        /* [in] */ ULONG32 reqCode,
        /* [in] */ ULONG32 inBufferSize,
        /* [size_is][in] */ BYTE *inBuffer,
        /* [in] */ ULONG32 outBufferSize,
        /* [size_is][out] */ BYTE *outBuffer);

    Thread* GetThread(void)
    {
        return m_thread;
    }

private:
    LONG m_refs;
    ClrDataAccess* m_dac;
    ULONG32 m_instanceAge;
    Thread* m_thread;
};

//----------------------------------------------------------------------------
//
// ClrDataStackWalk.
//
//----------------------------------------------------------------------------

class ClrDataStackWalk : public IXCLRDataStackWalk
{
public:
    ClrDataStackWalk(ClrDataAccess* dac,
                     Thread* Thread,
                     ULONG32 flags);
    virtual ~ClrDataStackWalk(void);

    // IUnknown.
    STDMETHOD(QueryInterface)(THIS_
                              IN REFIID interfaceId,
                              OUT PVOID* iface);
    STDMETHOD_(ULONG, AddRef)(THIS);
    STDMETHOD_(ULONG, Release)(THIS);

    //
    // IXCLRDataStackWalk.
    //

    virtual HRESULT STDMETHODCALLTYPE GetContext(
        /* [in] */ ULONG32 contextFlags,
        /* [in] */ ULONG32 contextBufSize,
        /* [out] */ ULONG32 *contextSize,
        /* [size_is][out] */ BYTE contextBuf[  ]);

    virtual HRESULT STDMETHODCALLTYPE SetContext(
        /* [in] */ ULONG32 contextSize,
        /* [size_is][in] */ BYTE context[  ]);

    virtual HRESULT STDMETHODCALLTYPE Next( void);

    virtual HRESULT STDMETHODCALLTYPE GetStackSizeSkipped(
        /* [out] */ ULONG64 *stackSizeSkipped);

    virtual HRESULT STDMETHODCALLTYPE GetFrameType(
        /* [out] */ CLRDataSimpleFrameType *simpleType,
        /* [out] */ CLRDataDetailedFrameType *detailedType);

    virtual HRESULT STDMETHODCALLTYPE GetFrame(
        /* [out] */ IXCLRDataFrame **frame);

    virtual HRESULT STDMETHODCALLTYPE Request(
        /* [in] */ ULONG32 reqCode,
        /* [in] */ ULONG32 inBufferSize,
        /* [size_is][in] */ BYTE *inBuffer,
        /* [in] */ ULONG32 outBufferSize,
        /* [size_is][out] */ BYTE *outBuffer);

    virtual HRESULT STDMETHODCALLTYPE SetContext2(
        /* [in] */ ULONG32 flags,
        /* [in] */ ULONG32 contextSize,
        /* [size_is][in] */ BYTE context[  ]);

    HRESULT Init(void);

private:
    void FilterFrames(void);
    void RawGetFrameType(
        /* [out] */ CLRDataSimpleFrameType* simpleType,
        /* [out] */ CLRDataDetailedFrameType* detailedType);

    LONG m_refs;
    ClrDataAccess* m_dac;
    ULONG32 m_instanceAge;
    Thread* m_thread;
    ULONG32 m_walkFlags;
    StackFrameIterator m_frameIter;
    REGDISPLAY m_regDisp;
    T_CONTEXT m_context;
    TADDR m_stackPrev;

    // This is part of a test hook for debugging.  Unless you're code:ClrDataStackWalk::Next
    //  you should never do anything with this member.
    INDEBUG( int m_framesUnwound; )

};

//----------------------------------------------------------------------------
//
// ClrDataFrame.
//
//----------------------------------------------------------------------------

class ClrDataFrame : public IXCLRDataFrame,
                            IXCLRDataFrame2
{
    friend class ClrDataStackWalk;

public:
    ClrDataFrame(ClrDataAccess* dac,
                 CLRDataSimpleFrameType simpleType,
                 CLRDataDetailedFrameType detailedType,
                 AppDomain* appDomain,
                 MethodDesc* methodDesc);
    virtual ~ClrDataFrame(void);

    // IUnknown.
    STDMETHOD(QueryInterface)(THIS_
                              IN REFIID interfaceId,
                              OUT PVOID* iface);
    STDMETHOD_(ULONG, AddRef)(THIS);
    STDMETHOD_(ULONG, Release)(THIS);

    //
    // IXCLRDataFrame.
    //

    virtual HRESULT STDMETHODCALLTYPE GetContext(
        /* [in] */ ULONG32 contextFlags,
        /* [in] */ ULONG32 contextBufSize,
        /* [out] */ ULONG32 *contextSize,
        /* [size_is][out] */ BYTE contextBuf[  ]);

    virtual HRESULT STDMETHODCALLTYPE GetFrameType(
        /* [out] */ CLRDataSimpleFrameType *simpleType,
        /* [out] */ CLRDataDetailedFrameType *detailedType);

    virtual HRESULT STDMETHODCALLTYPE GetAppDomain(
        /* [out] */ IXCLRDataAppDomain **appDomain);

    virtual HRESULT STDMETHODCALLTYPE GetNumArguments(
        /* [out] */ ULONG32 *numParams);

    virtual HRESULT STDMETHODCALLTYPE GetArgumentByIndex(
        /* [in] */ ULONG32 index,
        /* [out] */ IXCLRDataValue **arg,
        /* [in] */ ULONG32 bufLen,
        /* [out] */ ULONG32 *nameLen,
        /* [size_is][out] */ _Out_writes_to_opt_(bufLen, *nameLen) WCHAR name[  ]);

    virtual HRESULT STDMETHODCALLTYPE GetNumLocalVariables(
        /* [out] */ ULONG32 *numLocals);

    virtual HRESULT STDMETHODCALLTYPE GetLocalVariableByIndex(
        /* [in] */ ULONG32 index,
        /* [out] */ IXCLRDataValue **localVariable,
        /* [in] */ ULONG32 bufLen,
        /* [out] */ ULONG32 *nameLen,
        /* [size_is][out] */ _Out_writes_to_opt_(bufLen, *nameLen) WCHAR name[  ]);

    virtual HRESULT STDMETHODCALLTYPE GetNumTypeArguments(
        /* [out] */ ULONG32 *numTypeArgs);

    virtual HRESULT STDMETHODCALLTYPE GetTypeArgumentByIndex(
        /* [in] */ ULONG32 index,
        /* [out] */ IXCLRDataTypeInstance **typeArg);

    virtual HRESULT STDMETHODCALLTYPE GetCodeName(
        /* [in] */ ULONG32 flags,
        /* [in] */ ULONG32 bufLen,
        /* [out] */ ULONG32 *nameLen,
        /* [size_is][out] */ _Out_writes_bytes_opt_(bufLen) WCHAR nameBuf[  ]);

    virtual HRESULT STDMETHODCALLTYPE GetMethodInstance(
        /* [out] */ IXCLRDataMethodInstance **method);

    virtual HRESULT STDMETHODCALLTYPE Request(
        /* [in] */ ULONG32 reqCode,
        /* [in] */ ULONG32 inBufferSize,
        /* [size_is][in] */ BYTE *inBuffer,
        /* [in] */ ULONG32 outBufferSize,
        /* [size_is][out] */ BYTE *outBuffer);

    //
    // IXCLRDataFrame2.
    //

    virtual HRESULT STDMETHODCALLTYPE GetExactGenericArgsToken(
        /* [out] */ IXCLRDataValue ** genericToken);

private:
    HRESULT GetMethodSig(MetaSig** sig,
                         ULONG32* count);
    HRESULT GetLocalSig(MetaSig** sig,
                        ULONG32* count);
    HRESULT ValueFromDebugInfo(MetaSig* sig,
                               bool isArg,
                               DWORD sigIndex,
                               DWORD varInfoSlot,
                               IXCLRDataValue** value);

    LONG m_refs;
    ClrDataAccess* m_dac;
    ULONG32 m_instanceAge;
    CLRDataSimpleFrameType m_simpleType;
    CLRDataDetailedFrameType m_detailedType;
    AppDomain* m_appDomain;
    MethodDesc* m_methodDesc;
    REGDISPLAY m_regDisp;
    T_CONTEXT m_context;
    MetaSig* m_methodSig;
    MetaSig* m_localSig;
};

//----------------------------------------------------------------------------
//
// ClrDataExceptionState.
//
//----------------------------------------------------------------------------

#ifdef FEATURE_EH_FUNCLETS
typedef ExceptionTrackerBase ClrDataExStateType;
#else // FEATURE_EH_FUNCLETS
typedef ExInfo ClrDataExStateType;
#endif // FEATURE_EH_FUNCLETS


class ClrDataExceptionState : public IXCLRDataExceptionState
{
public:
    ClrDataExceptionState(ClrDataAccess* dac,
                          AppDomain* appDomain,
                          Thread* thread,
                          ULONG32 flags,
                          ClrDataExStateType* exInfo,
                          OBJECTHANDLE throwable,
                          ClrDataExStateType* prevExInfo);
    virtual ~ClrDataExceptionState(void);

    // IUnknown.
    STDMETHOD(QueryInterface)(THIS_
                              IN REFIID interfaceId,
                              OUT PVOID* iface);
    STDMETHOD_(ULONG, AddRef)(THIS);
    STDMETHOD_(ULONG, Release)(THIS);

    //
    // IXCLRDataExceptionState.
    //

    virtual HRESULT STDMETHODCALLTYPE GetFlags(
        /* [out] */ ULONG32 *flags);

    virtual HRESULT STDMETHODCALLTYPE GetPrevious(
        /* [out] */ IXCLRDataExceptionState **exState);

    virtual HRESULT STDMETHODCALLTYPE GetManagedObject(
        /* [out] */ IXCLRDataValue **value);

    virtual HRESULT STDMETHODCALLTYPE GetBaseType(
        /* [out] */ CLRDataBaseExceptionType *type);

    virtual HRESULT STDMETHODCALLTYPE GetCode(
        /* [out] */ ULONG32 *code);

    virtual HRESULT STDMETHODCALLTYPE GetString(
        /* [in] */ ULONG32 bufLen,
        /* [out] */ ULONG32 *strLen,
        /* [size_is][out] */ _Out_writes_to_opt_(bufLen, *strLen) WCHAR str[  ]);

    virtual HRESULT STDMETHODCALLTYPE IsSameState(
        /* [in] */ EXCEPTION_RECORD64 *exRecord,
        /* [in] */ ULONG32 contextSize,
        /* [size_is][in] */ BYTE cxRecord[  ]);

    virtual HRESULT STDMETHODCALLTYPE IsSameState2(
        /* [in] */ ULONG32 flags,
        /* [in] */ EXCEPTION_RECORD64 *exRecord,
        /* [in] */ ULONG32 contextSize,
        /* [size_is][in] */ BYTE cxRecord[  ]);

    virtual HRESULT STDMETHODCALLTYPE GetTask(
        /* [out] */ IXCLRDataTask** task);

    virtual HRESULT STDMETHODCALLTYPE Request(
        /* [in] */ ULONG32 reqCode,
        /* [in] */ ULONG32 inBufferSize,
        /* [size_is][in] */ BYTE *inBuffer,
        /* [in] */ ULONG32 outBufferSize,
        /* [size_is][out] */ BYTE *outBuffer);

    static HRESULT NewFromThread(ClrDataAccess* dac,
                                 Thread* thread,
                                 ClrDataExceptionState** exception,
                                 IXCLRDataExceptionState** pubException);

    PTR_CONTEXT          GetCurrentContextRecord();
    PTR_EXCEPTION_RECORD GetCurrentExceptionRecord();

friend class ClrDataAccess;
private:
    LONG m_refs;
    ClrDataAccess* m_dac;
    ULONG32 m_instanceAge;
    AppDomain* m_appDomain;
    Thread* m_thread;
    ULONG32 m_flags;
    ClrDataExStateType* m_exInfo;
    OBJECTHANDLE m_throwable;
    ClrDataExStateType* m_prevExInfo;
};

//----------------------------------------------------------------------------
//
// ClrDataValue.
//
//----------------------------------------------------------------------------

class ClrDataValue : public IXCLRDataValue
{
public:
    ClrDataValue(ClrDataAccess* dac,
                 AppDomain* appDomain,
                 Thread* thread,
                 ULONG32 flags,
                 TypeHandle typeHandle,
                 ULONG64 baseAddr,
                 ULONG32 numLocs,
                 NativeVarLocation* locs);
    virtual ~ClrDataValue(void);

    // IUnknown.
    STDMETHOD(QueryInterface)(THIS_
                              IN REFIID interfaceId,
                              OUT PVOID* iface);
    STDMETHOD_(ULONG, AddRef)(THIS);
    STDMETHOD_(ULONG, Release)(THIS);

    //
    // IXCLRDataValue.
    //

    virtual HRESULT STDMETHODCALLTYPE GetFlags(
        /* [out] */ ULONG32 *flags);

    virtual HRESULT STDMETHODCALLTYPE GetAddress(
        /* [out] */ CLRDATA_ADDRESS *address);

    virtual HRESULT STDMETHODCALLTYPE GetSize(
        /* [out] */ ULONG64 *size);

    virtual HRESULT STDMETHODCALLTYPE GetBytes(
        /* [in] */ ULONG32 bufLen,
        /* [out] */ ULONG32 *dataSize,
        /* [size_is][out] */ BYTE buffer[  ]);

    virtual HRESULT STDMETHODCALLTYPE SetBytes(
        /* [in] */ ULONG32 bufLen,
        /* [out] */ ULONG32 *dataSize,
        /* [size_is][in] */ BYTE buffer[  ]);

    virtual HRESULT STDMETHODCALLTYPE GetType(
        /* [out] */ IXCLRDataTypeInstance **typeInstance);

    virtual HRESULT STDMETHODCALLTYPE GetNumFields(
        /* [out] */ ULONG32 *numFields);

    virtual HRESULT STDMETHODCALLTYPE GetFieldByIndex(
        /* [in] */ ULONG32 index,
        /* [out] */ IXCLRDataValue **field,
        /* [in] */ ULONG32 bufLen,
        /* [out] */ ULONG32 *nameLen,
        /* [size_is][out] */ _Out_writes_to_opt_(bufLen, *nameLen) WCHAR nameBuf[  ],
        /* [out] */ mdFieldDef *token);

    virtual HRESULT STDMETHODCALLTYPE GetNumFields2(
        /* [in] */ ULONG32 flags,
        /* [in] */ IXCLRDataTypeInstance *fromType,
        /* [out] */ ULONG32 *numFields);

    virtual HRESULT STDMETHODCALLTYPE StartEnumFields(
        /* [in] */ ULONG32 flags,
        /* [in] */ IXCLRDataTypeInstance *fromType,
        /* [out] */ CLRDATA_ENUM *handle);

    virtual HRESULT STDMETHODCALLTYPE EnumField(
        /* [out][in] */ CLRDATA_ENUM *handle,
        /* [out] */ IXCLRDataValue **field,
        /* [in] */ ULONG32 nameBufLen,
        /* [out] */ ULONG32 *nameLen,
        /* [size_is][out] */ _Out_writes_to_opt_(nameBufLen, *nameLen) WCHAR nameBuf[  ],
        /* [out] */ mdFieldDef *token);

    virtual HRESULT STDMETHODCALLTYPE EnumField2(
        /* [out][in] */ CLRDATA_ENUM *handle,
        /* [out] */ IXCLRDataValue **field,
        /* [in] */ ULONG32 nameBufLen,
        /* [out] */ ULONG32 *nameLen,
        /* [size_is][out] */ _Out_writes_to_opt_(nameBufLen, *nameLen) WCHAR nameBuf[  ],
        /* [out] */ IXCLRDataModule** tokenScope,
        /* [out] */ mdFieldDef *token);

    virtual HRESULT STDMETHODCALLTYPE EndEnumFields(
        /* [in] */ CLRDATA_ENUM handle);

    virtual HRESULT STDMETHODCALLTYPE StartEnumFieldsByName(
        /* [in] */ LPCWSTR name,
        /* [in] */ ULONG32 nameFlags,
        /* [in] */ ULONG32 fieldFlags,
        /* [in] */ IXCLRDataTypeInstance *fromType,
        /* [out] */ CLRDATA_ENUM *handle);

    virtual HRESULT STDMETHODCALLTYPE EnumFieldByName(
        /* [out][in] */ CLRDATA_ENUM *handle,
        /* [out] */ IXCLRDataValue **field,
        /* [out] */ mdFieldDef *token);

    virtual HRESULT STDMETHODCALLTYPE EnumFieldByName2(
        /* [out][in] */ CLRDATA_ENUM *handle,
        /* [out] */ IXCLRDataValue **field,
        /* [out] */ IXCLRDataModule** tokenScope,
        /* [out] */ mdFieldDef *token);

    virtual HRESULT STDMETHODCALLTYPE EndEnumFieldsByName(
        /* [in] */ CLRDATA_ENUM handle);

    virtual HRESULT STDMETHODCALLTYPE GetFieldByToken(
        /* [in] */ mdFieldDef token,
        /* [out] */ IXCLRDataValue **field,
        /* [in] */ ULONG32 bufLen,
        /* [out] */ ULONG32 *nameLen,
        /* [size_is][out] */ _Out_writes_to_opt_(bufLen, *nameLen) WCHAR nameBuf[  ]);

    virtual HRESULT STDMETHODCALLTYPE GetFieldByToken2(
        /* [in] */ IXCLRDataModule* tokenScope,
        /* [in] */ mdFieldDef token,
        /* [out] */ IXCLRDataValue **field,
        /* [in] */ ULONG32 bufLen,
        /* [out] */ ULONG32 *nameLen,
        /* [size_is][out] */ _Out_writes_to_opt_(bufLen, *nameLen) WCHAR nameBuf[  ]);

    virtual HRESULT STDMETHODCALLTYPE GetAssociatedValue(
        /* [out] */ IXCLRDataValue **assocValue);

    virtual HRESULT STDMETHODCALLTYPE GetAssociatedType(
        /* [out] */ IXCLRDataTypeInstance **assocType);

    virtual HRESULT STDMETHODCALLTYPE GetString(
        /* [in] */ ULONG32 bufLen,
        /* [out] */ ULONG32 *strLen,
        /* [size_is][out] */ _Out_writes_to_opt_(bufLen, *strLen) WCHAR str[  ]);

    virtual HRESULT STDMETHODCALLTYPE GetArrayProperties(
        /* [out] */ ULONG32 *rank,
        /* [out] */ ULONG32 *totalElements,
        /* [in] */ ULONG32 numDim,
        /* [size_is][out] */ ULONG32 dims[  ],
        /* [in] */ ULONG32 numBases,
        /* [size_is][out] */ LONG32 bases[  ]);

    virtual HRESULT STDMETHODCALLTYPE GetArrayElement(
        /* [in] */ ULONG32 numInd,
        /* [size_is][in] */ LONG32 indices[  ],
        /* [out] */ IXCLRDataValue **value);

    virtual HRESULT STDMETHODCALLTYPE GetNumLocations(
        /* [out] */ ULONG32* numLocs);

    virtual HRESULT STDMETHODCALLTYPE GetLocationByIndex(
        /* [in] */ ULONG32 loc,
        /* [out] */ ULONG32* flags,
        /* [out] */ CLRDATA_ADDRESS* arg);

    virtual HRESULT STDMETHODCALLTYPE Request(
        /* [in] */ ULONG32 reqCode,
        /* [in] */ ULONG32 inBufferSize,
        /* [size_is][in] */ BYTE *inBuffer,
        /* [in] */ ULONG32 outBufferSize,
        /* [size_is][out] */ BYTE *outBuffer);

    HRESULT GetRefAssociatedValue(IXCLRDataValue** assocValue);

    static HRESULT NewFromFieldDesc(ClrDataAccess* dac,
                                    AppDomain* appDomain,
                                    ULONG32 flags,
                                    FieldDesc* fieldDesc,
                                    ULONG64 objBase,
                                    Thread* tlsThread,
                                    ClrDataValue** value,
                                    IXCLRDataValue** pubValue,
                                    ULONG32 nameBufRetLen,
                                    ULONG32* nameLenRet,
                                    _Out_writes_to_opt_(nameBufRetLen, *nameLenRet) WCHAR nameBufRet[  ],
                                    IXCLRDataModule** tokenScopeRet,
                                    mdFieldDef* tokenRet);

    HRESULT NewFromSubField(FieldDesc* fieldDesc,
                            ULONG32 flags,
                            ClrDataValue** value,
                            IXCLRDataValue** pubValue,
                            ULONG32 nameBufRetLen,
                            ULONG32* nameLenRet,
                            _Out_writes_to_opt_(nameBufRetLen, *nameLenRet) WCHAR nameBufRet[  ],
                            IXCLRDataModule** tokenScopeRet,
                            mdFieldDef* tokenRet)
    {
        return ClrDataValue::NewFromFieldDesc(m_dac,
                                              m_appDomain,
                                              flags,
                                              fieldDesc,
                                              m_baseAddr,
                                              m_thread,
                                              value,
                                              pubValue,
                                              nameBufRetLen,
                                              nameLenRet,
                                              nameBufRet,
                                              tokenScopeRet,
                                              tokenRet);
    }

    bool CanHaveFields(void)
    {
        return (m_flags & CLRDATA_VALUE_IS_REFERENCE) == 0;
    }

    HRESULT IntGetBytes(
        /* [in] */ ULONG32 bufLen,
        /* [size_is][out] */ BYTE buffer[  ]);

private:
    LONG m_refs;
    ClrDataAccess* m_dac;
    ULONG32 m_instanceAge;
    AppDomain* m_appDomain;
    Thread* m_thread;
    ULONG32 m_flags;
    TypeHandle m_typeHandle;
    ULONG64 m_totalSize;
    ULONG64 m_baseAddr;
    ULONG32 m_numLocs;
    NativeVarLocation m_locs[MAX_NATIVE_VAR_LOCS];
};

//----------------------------------------------------------------------------
//
// EnumMethodDefinitions.
//
//----------------------------------------------------------------------------

class EnumMethodDefinitions
{
public:
    HRESULT Start(Module* mod,
                  bool useAddrFilter,
                  CLRDATA_ADDRESS addrFilter);
    HRESULT Next(ClrDataAccess* dac,
                 IXCLRDataMethodDefinition **method);

    static HRESULT CdStart(Module* mod,
                           bool useAddrFilter,
                           CLRDATA_ADDRESS addrFilter,
                           CLRDATA_ENUM* handle);
    static HRESULT CdNext(ClrDataAccess* dac,
                          CLRDATA_ENUM* handle,
                          IXCLRDataMethodDefinition** method);
    static HRESULT CdEnd(CLRDATA_ENUM handle);

    Module* m_module;
    bool m_useAddrFilter;
    CLRDATA_ADDRESS m_addrFilter;
    MetaEnum m_typeEnum;
    mdToken m_typeToken;
    bool m_needMethodStart;
    MetaEnum m_methodEnum;
};

//----------------------------------------------------------------------------
//
// EnumMethodInstances.
//
//----------------------------------------------------------------------------

class EnumMethodInstances
{
public:
    EnumMethodInstances(MethodDesc* methodDesc,
                        IXCLRDataAppDomain* givenAppDomain);

    HRESULT Next(ClrDataAccess* dac,
                 IXCLRDataMethodInstance **instance);

    static HRESULT CdStart(MethodDesc* methodDesc,
                           IXCLRDataAppDomain* appDomain,
                           CLRDATA_ENUM* handle);
    static HRESULT CdNext(ClrDataAccess* dac,
                          CLRDATA_ENUM* handle,
                          IXCLRDataMethodInstance** method);
    static HRESULT CdEnd(CLRDATA_ENUM handle);

    MethodDesc* m_methodDesc;
    bool m_appDomainUsed;
    AppDomain* m_appDomain;
    LoadedMethodDescIterator m_methodIter;
};

//----------------------------------------------------------------------------
//
// Internal functions.
//
//----------------------------------------------------------------------------

#define DAC_ENTER() \
    EnterCriticalSection(&g_dacCritSec); \
    ClrDataAccess* __prevDacImpl = g_dacImpl; \
    g_dacImpl = this;

// When entering a child object we validate that
// the process's host instance cache hasn't been flushed
// since the child was created.
#define DAC_ENTER_SUB(dac) \
    EnterCriticalSection(&g_dacCritSec); \
    if (dac->m_instanceAge != m_instanceAge) \
    { \
        LeaveCriticalSection(&g_dacCritSec); \
        return E_INVALIDARG; \
    } \
    ClrDataAccess* __prevDacImpl = g_dacImpl; \
    g_dacImpl = (dac)

#define DAC_LEAVE() \
    g_dacImpl = __prevDacImpl; \
    LeaveCriticalSection(&g_dacCritSec)


#define SOSHelperEnter() \
    DAC_ENTER_SUB(mDac); \
    HRESULT hr = S_OK;   \
    EX_TRY               \
    {

#define SOSHelperLeave() \
    }                   \
    EX_CATCH            \
    {                   \
        if (!DacExceptionFilter(GET_EXCEPTION(), mDac, &hr)) \
        {               \
            EX_RETHROW; \
        }               \
    }                   \
    EX_END_CATCH(SwallowAllExceptions) \
    DAC_LEAVE();

HRESULT DacGetHostVtPtrs(void);
bool DacExceptionFilter(Exception* ex, ClrDataAccess* process,
                        HRESULT* status);
Thread* __stdcall DacGetThread(ULONG32 osThread);
BOOL DacGetThreadContext(Thread* thread, T_CONTEXT* context);

// Imports from request_svr.cpp, to provide data we need from the SVR namespace
int GCHeapCount();
HRESULT GetServerHeapData(CLRDATA_ADDRESS addr, DacpHeapSegmentData *pSegment);
HRESULT GetServerHeaps(CLRDATA_ADDRESS pGCHeaps[], ICorDebugDataTarget* pTarget);

#if defined(DAC_MEASURE_PERF)

#if defined(TARGET_X86)

// Assume Pentium CPU

#define CCNT_OVERHEAD_32  8
#define CCNT_OVERHEAD    13

#pragma warning( disable: 4035 )        /* Don't complain about lack of return value */

__inline uint64_t GetCycleCount ()
{
__asm   _emit   0x0F
__asm   _emit   0x31    /* rdtsc */
    // return EDX:EAX       causes annoying warning
};

__inline unsigned GetCycleCount32 ()  // enough for about 40 seconds
{
    LIMITED_METHOD_CONTRACT;

__asm   push    EDX
__asm   _emit   0x0F
__asm   _emit   0x31    /* rdtsc */
__asm   pop     EDX
    // return EAX       causes annoying warning
};

#pragma warning( default: 4035 )

#else // #if defined(TARGET_X86)

#define CCNT_OVERHEAD    0 // Don't know

__inline uint64_t GetCycleCount()
{
    LIMITED_METHOD_CONTRACT;

    LARGE_INTEGER qwTmp;
    QueryPerformanceCounter(&qwTmp);
    return qwTmp.QuadPart;
}

#endif  // #if defined(TARGET_X86)

extern uint64_t g_nTotalTime;
extern uint64_t g_nStackTotalTime;
extern uint64_t g_nReadVirtualTotalTime;
extern uint64_t g_nFindTotalTime;
extern uint64_t g_nFindHashTotalTime;
extern uint64_t g_nFindHits;
extern uint64_t g_nFindCalls;
extern uint64_t g_nFindFails;
extern uint64_t g_nStackWalk;
extern uint64_t g_nFindStackTotalTime;

#endif // #if defined(DAC_MEASURE_PERF)

#endif // #ifndef __DACIMPL_H__