Add wx headers and ext

wxheaders/wx/msw/seh.h

@@ -0,0 +1,67 @@
+///////////////////////////////////////////////////////////////////////////////
+// Name:        wx/msw/seh.h
+// Purpose:     declarations for SEH (structured exceptions handling) support
+// Author:      Vadim Zeitlin
+// Created:     2006-04-26
+// Copyright:   (c) 2006 Vadim Zeitlin <vadim@wxwidgets.org>
+// Licence:     wxWindows licence
+///////////////////////////////////////////////////////////////////////////////
+
+#ifndef _WX_MSW_SEH_H_
+#define _WX_MSW_SEH_H_
+
+#if wxUSE_ON_FATAL_EXCEPTION
+
+    // the exception handler which should be called from the exception filter
+    //
+    // it calls wxApp::OnFatalException() if wxTheApp object exists
+    WXDLLIMPEXP_BASE unsigned long wxGlobalSEHandler(EXCEPTION_POINTERS *pExcPtrs);
+
+    // helper macro for wxSEH_HANDLE
+    #define wxSEH_DUMMY_RETURN(rc)
+
+    // macros which allow to avoid many #if wxUSE_ON_FATAL_EXCEPTION in the code
+    // which uses them
+    #define wxSEH_TRY __try
+    #define wxSEH_IGNORE __except ( EXCEPTION_EXECUTE_HANDLER ) { }
+    #define wxSEH_HANDLE(rc)                                                  \
+        __except ( wxGlobalSEHandler(GetExceptionInformation()) )             \
+        {                                                                     \
+            /* use the same exit code as abort() */                           \
+            ::ExitProcess(3);                                                 \
+                                                                              \
+            wxSEH_DUMMY_RETURN(rc)                                            \
+        }
+
+#else // wxUSE_ON_FATAL_EXCEPTION
+    #define wxSEH_TRY
+    #define wxSEH_IGNORE
+    #define wxSEH_HANDLE(rc)
+#endif // wxUSE_ON_FATAL_EXCEPTION
+
+#if wxUSE_ON_FATAL_EXCEPTION && defined(__VISUALC__)
+    #include <eh.h>
+
+    // C++ exception to structured exceptions translator: we need it in order
+    // to prevent VC++ from "helpfully" translating structured exceptions (such
+    // as division by 0 or access violation) to C++ pseudo-exceptions
+    extern void wxSETranslator(unsigned int code, EXCEPTION_POINTERS *ep);
+
+    // This warning ("calling _set_se_translator() requires /EHa") seems to be
+    // harmless with all the supported MSVC versions (up to 14.2, a.k.a. MSVS
+    // 2019), i.e. SEH translator seems to work just fine without /EHa too, so
+    // suppress it here as it's easier to suppress it than deal with it at
+    // make/ project files level.
+    #if __VISUALC__ < 2000
+        #pragma warning(disable: 4535)
+    #endif
+
+    // note that the SE translator must be called wxSETranslator!
+    #define DisableAutomaticSETranslator() _set_se_translator(wxSETranslator)
+#else // !__VISUALC__
+    // the other compilers do nothing as stupid by default so nothing to do for
+    // them
+    #define DisableAutomaticSETranslator()
+#endif // __VISUALC__/!__VISUALC__
+
+#endif // _WX_MSW_SEH_H_