appbase.cpp

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#if 0 // can't use wxLogTrace, not up and running yet
    printf("checking build options object '%s' (ptr %p) in '%s'\n",
             optionsSignature, optionsSignature, componentName);
#endif

    if ( strcmp(optionsSignature, WX_BUILD_OPTIONS_SIGNATURE) != 0 )
    {
        wxString lib = wxString::FromAscii(WX_BUILD_OPTIONS_SIGNATURE);
        wxString prog = wxString::FromAscii(optionsSignature);
        wxString progName = wxString::FromAscii(componentName);
        wxString msg;

        msg.Printf(_T("Mismatch between the program and library build versions detected.\nThe library used %s,\nand %s used %s."),
                   lib.c_str(), progName.c_str(), prog.c_str());

        wxLogFatalError(msg.c_str());

        // normally wxLogFatalError doesn't return
        return false;
    }
#undef wxCMP

    return true;
}

#ifdef __WXDEBUG__

void wxAppConsole::OnAssert(const wxChar *file,
                            int line,
                            const wxChar *cond,
                            const wxChar *msg)
{
    ShowAssertDialog(file, line, cond, msg, GetTraits());
}

#endif // __WXDEBUG__

#if WXWIN_COMPATIBILITY_2_4

bool wxAppConsole::CheckBuildOptions(const wxBuildOptions& buildOptions)
{
    return CheckBuildOptions(buildOptions.m_signature, "your program");
}

#endif

// ============================================================================
// other classes implementations
// ============================================================================

// ----------------------------------------------------------------------------
// wxConsoleAppTraitsBase
// ----------------------------------------------------------------------------

#if wxUSE_LOG

wxLog *wxConsoleAppTraitsBase::CreateLogTarget()
{
    return new wxLogStderr;
}

#endif // wxUSE_LOG

wxMessageOutput *wxConsoleAppTraitsBase::CreateMessageOutput()
{
    return new wxMessageOutputStderr;
}

#if wxUSE_FONTMAP

wxFontMapper *wxConsoleAppTraitsBase::CreateFontMapper()
{
    return (wxFontMapper *)new wxFontMapperBase;
}

#endif // wxUSE_FONTMAP

wxRendererNative *wxConsoleAppTraitsBase::CreateRenderer()
{
    // console applications don't use renderers
    return NULL;
}

#ifdef __WXDEBUG__
bool wxConsoleAppTraitsBase::ShowAssertDialog(const wxString& msg)
{
    return wxAppTraitsBase::ShowAssertDialog(msg);
}
#endif

bool wxConsoleAppTraitsBase::HasStderr()
{
    // console applications always have stderr, even under Mac/Windows
    return true;
}

void wxConsoleAppTraitsBase::ScheduleForDestroy(wxObject *object)
{
    delete object;
}

void wxConsoleAppTraitsBase::RemoveFromPendingDelete(wxObject * WXUNUSED(object))
{
    // nothing to do
}

#if wxUSE_SOCKETS
GSocketGUIFunctionsTable* wxConsoleAppTraitsBase::GetSocketGUIFunctionsTable()
{
    return NULL;
}
#endif

// ----------------------------------------------------------------------------
// wxAppTraits
// ----------------------------------------------------------------------------

#ifdef __WXDEBUG__

bool wxAppTraitsBase::ShowAssertDialog(const wxString& msg)
{
    return DoShowAssertDialog(msg);
}

#endif // __WXDEBUG__

// ============================================================================
// global functions implementation
// ============================================================================

void wxExit()
{
    if ( wxTheApp )
    {
        wxTheApp->Exit();
    }
    else
    {
        // what else can we do?
        exit(-1);
    }
}

void wxWakeUpIdle()
{
    if ( wxTheApp )
    {
        wxTheApp->WakeUpIdle();
    }
    //else: do nothing, what can we do?
}

#ifdef  __WXDEBUG__

// wxASSERT() helper
bool wxAssertIsEqual(int x, int y)
{
    return x == y;
}

// break into the debugger
void wxTrap()
{
#if defined(__WXMSW__) && !defined(__WXMICROWIN__)
    DebugBreak();
#elif defined(__WXMAC__) && !defined(__DARWIN__)
    #if __powerc
        Debugger();
    #else
        SysBreak();
    #endif
#elif defined(_MSL_USING_MW_C_HEADERS) && _MSL_USING_MW_C_HEADERS
    Debugger();
#elif defined(__UNIX__)
    raise(SIGTRAP);
#else
    // TODO
#endif // Win/Unix
}

void wxAssert(int cond,
              const wxChar *szFile,
              int nLine,
              const wxChar *szCond,
              const wxChar *szMsg)
{
    if ( !cond )
        wxOnAssert(szFile, nLine, szCond, szMsg);
}

// this function is called when an assert fails
void wxOnAssert(const wxChar *szFile,
                int nLine,
                const wxChar *szCond,
                const wxChar *szMsg)
{
    // FIXME MT-unsafe
    static bool s_bInAssert = false;

    if ( s_bInAssert )
    {
        // He-e-e-e-elp!! we're trapped in endless loop
        wxTrap();

        s_bInAssert = false;

        return;
    }

    s_bInAssert = true;

    if ( !wxTheApp )
    {
        // by default, show the assert dialog box -- we can't customize this
        // behaviour
        ShowAssertDialog(szFile, nLine, szCond, szMsg);
    }
    else
    {
        // let the app process it as it wants
        wxTheApp->OnAssert(szFile, nLine, szCond, szMsg);
    }

    s_bInAssert = false;
}

#endif // __WXDEBUG__

// ============================================================================
// private functions implementation
// ============================================================================

#ifdef __WXDEBUG__

static void LINKAGEMODE SetTraceMasks()
{
#if wxUSE_LOG
    wxString mask;
    if ( wxGetEnv(wxT("WXTRACE"), &mask) )
    {
        wxStringTokenizer tkn(mask, wxT(",;:"));
        while ( tkn.HasMoreTokens() )
            wxLog::AddTraceMask(tkn.GetNextToken());
    }
#endif // wxUSE_LOG
}

bool DoShowAssertDialog(const wxString& msg)
{
    // under MSW we can show the dialog even in the console mode
#if defined(__WXMSW__) && !defined(__WXMICROWIN__)
    wxString msgDlg(msg);

    // this message is intentionally not translated -- it is for
    // developpers only
    msgDlg += wxT("\nDo you want to stop the program?\n")
              wxT("You can also choose [Cancel] to suppress ")
              wxT("further warnings.");

    switch ( ::MessageBox(NULL, msgDlg, _T("wxWidgets Debug Alert"),
                          MB_YESNOCANCEL | MB_ICONSTOP ) )
    {
        case IDYES:
            wxTrap();
            break;

        case IDCANCEL:
            // stop the asserts
            return true;

        //case IDNO: nothing to do
    }
#else // !__WXMSW__
    wxFprintf(stderr, wxT("%s\n"), msg.c_str());
    fflush(stderr);

    // TODO: ask the user to enter "Y" or "N" on the console?
    wxTrap();
#endif // __WXMSW__/!__WXMSW__

    // continue with the asserts
    return false;
}

#if wxUSE_STACKWALKER
static wxString GetAssertStackTrace()
{
    wxString stackTrace;

    class StackDump : public wxStackWalker
    {
    public:
        StackDump() { }

        const wxString& GetStackTrace() const { return m_stackTrace; }

    protected:
        virtual void OnStackFrame(const wxStackFrame& frame)
        {
            m_stackTrace << wxString::Format(_T("[%02d] "), frame.GetLevel());

            wxString name = frame.GetName();
            if ( !name.empty() )
            {
                m_stackTrace << wxString::Format(_T("%-40s"), name.c_str());
            }
            else
            {
                m_stackTrace << wxString::Format
                                (
                                    _T("0x%08lx"),
                                    (unsigned long)frame.GetAddress()
                                );
            }

            if ( frame.HasSourceLocation() )
            {
                m_stackTrace << _T('\t')
                             << frame.GetFileName()
                             << _T(':')
                             << frame.GetLine();
            }

            m_stackTrace << _T('\n');
        }

    private:
        wxString m_stackTrace;
    };

    StackDump dump;
    dump.Walk(5); // don't show OnAssert() call itself
    stackTrace = dump.GetStackTrace();

    // don't show more than maxLines or we could get a dialog too tall to be
    // shown on screen: 20 should be ok everywhere as even with 15 pixel high
    // characters it is still only 300 pixels...
    static const int maxLines = 20;
    const int count = stackTrace.Freq(wxT('\n'));
    for ( int i = 0; i < count - maxLines; i++ )
        stackTrace = stackTrace.BeforeLast(wxT('\n'));

    return stackTrace;
}
#endif // wxUSE_STACKWALKER

// show the assert modal dialog
static
void ShowAssertDialog(const wxChar *szFile,
                      int nLine,
                      const wxChar *szCond,
                      const wxChar *szMsg,
                      wxAppTraits *traits)
{
    // this variable can be set to true to suppress "assert failure" messages
    static bool s_bNoAsserts = false;

    wxString msg;
    msg.reserve(2048);

    // make life easier for people using VC++ IDE by using this format: like
    // this, clicking on the message will take us immediately to the place of
    // the failed assert
    msg.Printf(wxT("%s(%d): assert \"%s\" failed"), szFile, nLine, szCond);

    if ( szMsg )
    {
        msg << _T(": ") << szMsg;
    }
    else // no message given
    {
        msg << _T('.');
    }

#if wxUSE_STACKWALKER
    const wxString stackTrace = GetAssertStackTrace();
    if ( !stackTrace.empty() )
    {
        msg << _T("\n\nCall stack:\n") << stackTrace;
    }
#endif // wxUSE_STACKWALKER

#if wxUSE_THREADS
    // if we are not in the main thread, output the assert directly and trap
    // since dialogs cannot be displayed
    if ( !wxThread::IsMain() )
    {
        msg += wxT(" [in child thread]");

#if defined(__WXMSW__) && !defined(__WXMICROWIN__)
        msg << wxT("\r\n");
        OutputDebugString(msg );
#else
        // send to stderr
        wxFprintf(stderr, wxT("%s\n"), msg.c_str());
        fflush(stderr);
#endif
        // He-e-e-e-elp!! we're asserting in a child thread
        wxTrap();
    }
    else
#endif // wxUSE_THREADS

    if ( !s_bNoAsserts )
    {
        // send it to the normal log destination
        wxLogDebug(_T("%s"), msg.c_str());

        if ( traits )
        {
            // delegate showing assert dialog (if possible) to that class
            s_bNoAsserts = traits->ShowAssertDialog(msg);
        }
        else // no traits object
        {
            // fall back to the function of last resort
            s_bNoAsserts = DoShowAssertDialog(msg);
        }
    }
}

#endif // __WXDEBUG__