When important debug events, such as new module loads and exceptions, occur in the context of a process that’s being debugged by a user-mode debugger, the OS generates message notifications on behalf of the target and sends them to the debugger process, giving the debugger program a chance to either handle or ignore those notifications.
#MICROSOFT SCRIPT DEBUGGER WINDOWS#
To support controlling the target in user-mode debugging, the Windows operating system (OS) has an architecture based on the following principles: These basic requirements drive the design of the native user-mode debugging architecture in Windows. In particular, you want to be able to set breakpoints and step through the target code, one instruction or one source line at a time. User-Mode DebuggingĪ user-mode debugger gives you the ability to inspect the memory of the target program you’re trying to debug, as well as the ability to control its execution. This chapter concludes with a section that explains remote debugging and the key concepts that drive its architecture. With HTML5 and JavaScript becoming more prevalent development technologies for rich client user interfaces, script debugging is likely to garner even more attention from Windows developers in the future.
NET source-level debugging isn’t currently supported by the Windows debuggers.įollowing that discussion, you’ll learn how the architecture of script debugging relates to that of. You’ll also dive into the architecture of managed-code debugging and discover why. For example, this chapter explains why certain debugger commands and features work only in user-mode or kernel-mode debugging.
If you know these architectural foundations, many debugger concepts and behaviors suddenly start making sense.
#MICROSOFT SCRIPT DEBUGGER CODE#
when using DirectAccess), you might want to try using Windows’ proxy resolution code rather than the code within Chromium. Until the logging is enhanced, users can hit SHIFT+ESC to launch the browser’s task manager and check to see whether the utility process is alive. because Citrix injected a DLL into it), there’s no mention of that crash in the NetLog it will just show DIRECT. One current limitation of the current logging is that if the V8 Proxy Resolver process… Search in the Events tab for PAC_JAVASCRIPT_ALERT events:Įven without adding new alert() calls, you can also look for HTTP_STREAM_JOB_CONTROLLER_PROXY_SERVER_RESOLVED events to see what proxy the proxy resolution process determined should be used. Save the NetLog JSON file and reload it into the NetLog viewer. Msedge.exe -log-net-log=C:\temp\logFull.json -net-log-capture-mode=IncludeSocketBytes Then, collect a NetLog trace from the browser: To use it, simply add alert() calls to your PAC script, like so:Īlert("!!!!!!!!! PAC script start parse !!!!!!!!") Īlert("Got request for (" + url+ " with host: " + host + ")") Īlert("!!!!!!!!! PAC script done parse !!!!!!!!")
One thing I’d like to call out is that Microsoft Edge’s new Chromium foundation introduces a convenient new debugging feature for debugging the behavior of Proxy AutoConfiguration (PAC) scripts. I’ve written about Browser Proxy Configuration a few times over the years, and I’m delighted that Chromium has accurate & up-to-date documentation for its proxy support.
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