debughlp.cpp

来自「A*算法 A*算法 A*算法 A*算法A*算法A*算法」· C++ 代码 · 共 768 行 · 第 1/2 页

    // we have to limit the depth of UDT dumping as otherwise we get in
    // infinite loops trying to dump linked lists... 10 levels seems quite
    // reasonable, full information is in minidump file anyhow
    if ( level > 10 )
        return s;

    s.reserve(512);
    s = GetSymbolName(pSym);

#if !wxUSE_STL
    // special handling for ubiquitous wxString: although the code below works
    // for it as well, it shows the wxStringBase class and takes 4 lines
    // instead of only one as this branch
    if ( s == _T("wxString") )
    {
        wxString *ps = (wxString *)pVariable;

        // we can't just dump wxString directly as it could be corrupted or
        // invalid and it could also be locked for writing (i.e. if we're
        // between GetWriteBuf() and UngetWriteBuf() calls) and assert when we
        // try to access it contents using public methods, so instead use our
        // knowledge of its internals
        const wxChar *p = NULL;
        if ( !::IsBadReadPtr(ps, sizeof(wxString)) )
        {
            p = ps->data();
            wxStringData *data = (wxStringData *)p - 1;
            if ( ::IsBadReadPtr(data, sizeof(wxStringData)) ||
                    ::IsBadReadPtr(p, sizeof(wxChar *)*data->nAllocLength) )
            {
                p = NULL; // don't touch this pointer with 10 feet pole
            }
        }

        s << _T("(\"") << (p ? p : _T("???")) << _T(")\"");
    }
    else // any other UDT
#endif // !wxUSE_STL
    {
        // Determine how many children this type has.
        DWORD dwChildrenCount = 0;
        DoGetTypeInfo(pSym, TI_GET_CHILDRENCOUNT, &dwChildrenCount);

        // Prepare to get an array of "TypeIds", representing each of the children.
        TI_FINDCHILDREN_PARAMS *children = (TI_FINDCHILDREN_PARAMS *)
            malloc(sizeof(TI_FINDCHILDREN_PARAMS) +
                        (dwChildrenCount - 1)*sizeof(ULONG));
        if ( !children )
            return s;

        children->Count = dwChildrenCount;
        children->Start = 0;

        // Get the array of TypeIds, one for each child type
        if ( !DoGetTypeInfo(pSym, TI_FINDCHILDREN, children) )
        {
            free(children);
            return s;
        }

        s << _T(" {\n");

        // Iterate through all children
        SYMBOL_INFO sym;
        wxZeroMemory(sym);
        sym.ModBase = pSym->ModBase;
        for ( unsigned i = 0; i < dwChildrenCount; i++ )
        {
            sym.TypeIndex = children->ChildId[i];

            // children here are in lexicographic sense, i.e. we get all our nested
            // classes and not only our member fields, but we can't get the values
            // for the members of the nested classes, of course!
            DWORD nested;
            if ( DoGetTypeInfo(&sym, TI_GET_NESTED, &nested) && nested )
                continue;

            // avoid infinite recursion: this does seem to happen sometimes with
            // complex typedefs...
            if ( sym.TypeIndex == pSym->TypeIndex )
                continue;

            s += DumpField(&sym, pVariable, level + 1);
        }

        free(children);

        s << wxString(_T('\t'), level + 1) << _T('}');
    }

    return s;
}

/* static */
wxDbgHelpDLL::SymbolTag
wxDbgHelpDLL::DereferenceSymbol(PSYMBOL_INFO pSym, void **ppData)
{
    SymbolTag tag = SYMBOL_TAG_NULL;
    for ( ;; )
    {
        if ( !DoGetTypeInfo(pSym, TI_GET_SYMTAG, &tag) )
            break;

        if ( tag != SYMBOL_TAG_POINTER_TYPE )
            break;

        ULONG tiNew;
        if ( !DoGetTypeInfo(pSym, TI_GET_TYPEID, &tiNew) ||
                tiNew == pSym->TypeIndex )
            break;

        pSym->TypeIndex = tiNew;

        // remove one level of indirection except for the char strings: we want
        // to dump "char *" and not a single "char" for them
        if ( ppData && *ppData && GetBasicType(pSym) != BASICTYPE_CHAR )
        {
            DWORD_PTR *pData = (DWORD_PTR *)*ppData;

            if ( ::IsBadReadPtr(pData, sizeof(DWORD_PTR *)) )
            {
                break;
            }

            *ppData = (void *)*pData;
        }
    }

    return tag;
}

/* static */ wxString
wxDbgHelpDLL::DumpSymbol(PSYMBOL_INFO pSym, void *pVariable)
{
    wxString s;
    SYMBOL_INFO symDeref = *pSym;
    switch ( DereferenceSymbol(&symDeref, &pVariable) )
    {
        case SYMBOL_TAG_UDT:
            // show UDT recursively
            s = DumpUDT(&symDeref, pVariable);
            break;

        case SYMBOL_TAG_BASE_TYPE:
            // variable of simple type, show directly
            BasicType bt = GetBasicType(&symDeref);
            if ( bt )
            {
                s = DumpBaseType(bt, pSym->Size, pVariable);
            }
            break;
    }

    return s;
}

// ----------------------------------------------------------------------------
// debugging helpers
// ----------------------------------------------------------------------------

// this code is very useful when debugging debughlp.dll-related code but
// probably not worth having compiled in normally, please do not remove it!
#if 0 // ndef NDEBUG

static wxString TagString(wxDbgHelpDLL::SymbolTag tag)
{
    static const wxChar *tags[] =
    {
        _T("null"),
        _T("exe"),
        _T("compiland"),
        _T("compiland details"),
        _T("compiland env"),
        _T("function"),
        _T("block"),
        _T("data"),
        _T("annotation"),
        _T("label"),
        _T("public symbol"),
        _T("udt"),
        _T("enum"),
        _T("function type"),
        _T("pointer type"),
        _T("array type"),
        _T("base type"),
        _T("typedef"),
        _T("base class"),
        _T("friend"),
        _T("function arg type"),
        _T("func debug start"),
        _T("func debug end"),
        _T("using namespace"),
        _T("vtable shape"),
        _T("vtable"),
        _T("custom"),
        _T("thunk"),
        _T("custom type"),
        _T("managed type"),
        _T("dimension"),
    };

    wxCOMPILE_TIME_ASSERT( WXSIZEOF(tags) == wxDbgHelpDLL::SYMBOL_TAG_MAX,
                                SymbolTagStringMismatch );

    wxString s;
    if ( tag < WXSIZEOF(tags) )
        s = tags[tag];
    else
        s.Printf(_T("unrecognized tag (%d)"), tag);

    return s;
}

static wxString KindString(wxDbgHelpDLL::DataKind kind)
{
    static const wxChar *kinds[] =
    {
         _T("unknown"),
         _T("local"),
         _T("static local"),
         _T("param"),
         _T("object ptr"),
         _T("file static"),
         _T("global"),
         _T("member"),
         _T("static member"),
         _T("constant"),
    };

    wxCOMPILE_TIME_ASSERT( WXSIZEOF(kinds) == wxDbgHelpDLL::DATA_MAX,
                                DataKindStringMismatch );

    wxString s;
    if ( kind < WXSIZEOF(kinds) )
        s = kinds[kind];
    else
        s.Printf(_T("unrecognized kind (%d)"), kind);

    return s;
}

static wxString UdtKindString(wxDbgHelpDLL::UdtKind kind)
{
    static const wxChar *kinds[] =
    {
         _T("struct"),
         _T("class"),
         _T("union"),
    };

    wxCOMPILE_TIME_ASSERT( WXSIZEOF(kinds) == wxDbgHelpDLL::UDT_MAX,
                                UDTKindStringMismatch );

    wxString s;
    if ( kind < WXSIZEOF(kinds) )
        s = kinds[kind];
    else
        s.Printf(_T("unrecognized UDT (%d)"), kind);

    return s;
}

static wxString TypeString(wxDbgHelpDLL::BasicType bt)
{
    static const wxChar *types[] =
    {
        _T("no type"),
        _T("void"),
        _T("char"),
        _T("wchar"),
        _T(""),
        _T(""),
        _T("int"),
        _T("uint"),
        _T("float"),
        _T("bcd"),
        _T("bool"),
        _T(""),
        _T(""),
        _T("long"),
        _T("ulong"),
        _T(""),
        _T(""),
        _T(""),
        _T(""),
        _T(""),
        _T(""),
        _T(""),
        _T(""),
        _T(""),
        _T(""),
        _T("CURRENCY"),
        _T("DATE"),
        _T("VARIANT"),
        _T("complex"),
        _T("bit"),
        _T("BSTR"),
        _T("HRESULT"),
    };

    wxCOMPILE_TIME_ASSERT( WXSIZEOF(types) == wxDbgHelpDLL::BASICTYPE_MAX,
                                BasicTypeStringMismatch );

    wxString s;
    if ( bt < WXSIZEOF(types) )
        s = types[bt];

    if ( s.empty() )
        s.Printf(_T("unrecognized type (%d)"), bt);

    return s;
}

// this function is meant to be called from under debugger to see the
// proprieties of the given type id
extern "C" void DumpTI(ULONG ti)
{
    SYMBOL_INFO sym = { sizeof(SYMBOL_INFO) };
    sym.ModBase = 0x400000; // it's a constant under Win32
    sym.TypeIndex = ti;

    wxDbgHelpDLL::SymbolTag tag = wxDbgHelpDLL::SYMBOL_TAG_NULL;
    DoGetTypeInfo(&sym, TI_GET_SYMTAG, &tag);
    DoGetTypeInfo(&sym, TI_GET_TYPEID, &ti);

    OutputDebugString(wxString::Format(_T("Type 0x%x: "), sym.TypeIndex));
    wxString name = wxDbgHelpDLL::GetSymbolName(&sym);
    if ( !name.empty() )
    {
        OutputDebugString(wxString::Format(_T("name=\"%s\", "), name.c_str()));
    }

    DWORD nested;
    if ( !DoGetTypeInfo(&sym, TI_GET_NESTED, &nested) )
    {
        nested = FALSE;
    }

    OutputDebugString(wxString::Format(_T("tag=%s%s"),
                      nested ? _T("nested ") : wxEmptyString,
                      TagString(tag).c_str()));
    if ( tag == wxDbgHelpDLL::SYMBOL_TAG_UDT )
    {
        wxDbgHelpDLL::UdtKind udtKind;
        if ( DoGetTypeInfo(&sym, TI_GET_UDTKIND, &udtKind) )
        {
            OutputDebugString(_T(" (") + UdtKindString(udtKind) + _T(')'));
        }
    }

    wxDbgHelpDLL::DataKind kind = wxDbgHelpDLL::DATA_UNKNOWN;
    if ( DoGetTypeInfo(&sym, TI_GET_DATAKIND, &kind) )
    {
        OutputDebugString(wxString::Format(
            _T(", kind=%s"), KindString(kind).c_str()));
        if ( kind == wxDbgHelpDLL::DATA_MEMBER )
        {
            DWORD ofs = 0;
            if ( DoGetTypeInfo(&sym, TI_GET_OFFSET, &ofs) )
            {
                OutputDebugString(wxString::Format(_T(" (ofs=0x%x)"), ofs));
            }
        }
    }

    wxDbgHelpDLL::BasicType bt = GetBasicType(&sym);
    if ( bt )
    {
        OutputDebugString(wxString::Format(_T(", type=%s"),
                                TypeString(bt).c_str()));
    }

    if ( ti != sym.TypeIndex )
    {
        OutputDebugString(wxString::Format(_T(", next ti=0x%x"), ti));
    }

    OutputDebugString(_T("\r\n"));
}

#endif // NDEBUG

#endif // wxUSE_DBGHELP