https://github.com/Discookie created https://github.com/llvm/llvm-project/pull/139068
Finds instances of always-true and always-false conditions in branch statements, a straightforward use case for the dataflow framework. This check is a work in progress - the core of the check is simple, but there are too many false positives currently for the check to be usable. More heuristics are needed to reduce the count of false positives. Currently only assert-like statements are filtered out. More information on false-positive types are in the docs here: https://github.com/Discookie/llvm-project/blob/dataflow-deadcode/clang-tools-extra/docs/clang-tidy/checks/bugprone/dataflow-dead-code.rst [Results on some open-source projects](https://codechecker-demo.eastus.cloudapp.azure.com/Default/runs?run=discookie-dataflow-deadcode) Framework improvements needed for the check to be fully functional: - A branch transfer function in the Diagnoser entity. The workaround for this missing function is wonky and causes many false positives. - Some kind of support for C++ classes. I can technically work this around inside my check, but first-class support for it would be nice. <!DOCTYPE html> <html> <head> <meta http-equiv="Content-type" content="text/html; charset=utf-8"> <meta http-equiv="Content-Security-Policy" content="default-src 'none'; base-uri 'self'; connect-src 'self'; form-action 'self'; img-src 'self' data:; script-src 'self'; style-src 'unsafe-inline'"> <meta content="origin" name="referrer"> <title>Rate limit · GitHub</title> <meta name="viewport" content="width=device-width"> <style type="text/css" media="screen"> body { background-color: #f6f8fa; color: #24292e; font-family: -apple-system,BlinkMacSystemFont,Segoe UI,Helvetica,Arial,sans-serif,Apple Color Emoji,Segoe UI Emoji,Segoe UI Symbol; font-size: 14px; line-height: 1.5; margin: 0; } .container { margin: 50px auto; max-width: 600px; text-align: center; padding: 0 24px; } a { color: #0366d6; text-decoration: none; } a:hover { text-decoration: underline; } h1 { line-height: 60px; font-size: 48px; font-weight: 300; margin: 0px; text-shadow: 0 1px 0 #fff; } p { color: rgba(0, 0, 0, 0.5); margin: 20px 0 40px; } ul { list-style: none; margin: 25px 0; padding: 0; } li { display: table-cell; font-weight: bold; width: 1%; } .logo { display: inline-block; margin-top: 35px; } .logo-img-2x { display: none; } @media only screen and (-webkit-min-device-pixel-ratio: 2), only screen and ( min--moz-device-pixel-ratio: 2), only screen and ( -o-min-device-pixel-ratio: 2/1), only screen and ( min-device-pixel-ratio: 2), only screen and ( min-resolution: 192dpi), only screen and ( min-resolution: 2dppx) { .logo-img-1x { display: none; } .logo-img-2x { display: inline-block; } } #suggestions { margin-top: 35px; color: #ccc; } #suggestions a { color: #666666; font-weight: 200; font-size: 14px; margin: 0 10px; } </style> </head> <body> <div class="container"> <h1>Whoa there!</h1> <p>You have exceeded a secondary rate limit.<br><br> Please wait a few minutes before you try again;<br> in some cases this may take up to an hour. </p> <div id="suggestions"> <a href="https://support.github.com/contact";>Contact Support</a> — <a href="https://githubstatus.com";>GitHub Status</a> — <a href="https://twitter.com/githubstatus";>@githubstatus</a> </div> <a href="/" class="logo logo-img-1x"> <img width="32" height="32" title="" alt="" src="data:image/png;base64,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"> </a> <a href="/" class="logo logo-img-2x"> <img width="32" height="32" title="" alt="" src="data:image/png;base64,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"> </a> </div> </body> </html> _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
