31 

    32 void VMError::show_message_box(char *buf, int buflen) {

    33   bool yes;

    34   do {

    35     error_string(buf, buflen);

    36     int len = (int)strlen(buf);

    37     char *p = &buf[len];

    38 

    39     jio_snprintf(p, buflen - len,

    40                "\n\n"

    41                "Do you want to debug the problem?\n\n"

    42                "To debug, attach Visual Studio to process %d; then switch to thread 0x%x\n"

    43                "Select 'Yes' to launch Visual Studio automatically (PATH must include msdev)\n"

    44                "Otherwise, select 'No' to abort...",

    45                os::current_process_id(), os::current_thread_id());

    46 

    47     yes = os::message_box("Unexpected Error", buf) != 0;

    48 

    49     if (yes) {

    50       // yes, user asked VM to launch debugger

    51       //

    52       // os::breakpoint() calls DebugBreak(), which causes a breakpoint

    53       // exception. If VM is running inside a debugger, the debugger will

    54       // catch the exception. Otherwise, the breakpoint exception will reach

    55       // the default windows exception handler, which can spawn a debugger and

    56       // automatically attach to the dying VM.

    57       os::breakpoint();

    58       yes = false;

    59     }

    60   } while (yes);

    61 }

    62