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From: "mengli.ming at outlook dot com" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug analyzer/108492] New: __analyzer_eval has effect on the analysis result of gcc static analyzer Date: Mon, 23 Jan 2023 10:44:47 +0000 [thread overview] Message-ID: <bug-108492-4@http.gcc.gnu.org/bugzilla/> (raw) https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108492 Bug ID: 108492 Summary: __analyzer_eval has effect on the analysis result of gcc static analyzer Product: gcc Version: 13.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: analyzer Assignee: dmalcolm at gcc dot gnu.org Reporter: mengli.ming at outlook dot com Target Milestone: --- case: ```c void __analyzer_eval(); void f(int b) { int c = 1; __analyzer_eval(c && (c = 0) | b); if (c && (c = 0) | b) { int *p = (int *)0; __analyzer_eval(c && (c = 0) | b); if (c && (c = 0) | b) { *p = 42; } } } ``` In this case, when `__analyzer_eval` is added at line 6 (https://godbolt.org/z/defnzqKPn), the eval statement inside the if branch has no output. However, when line 6 is commented out (https://godbolt.org/z/j4dGGEM1s), then the result is output. Also, the eval result of `(c && (c = 0) | b)` should probably be TRUE after analyzer goes inside the if branch. Thank you for taking the time to review this case.
next reply other threads:[~2023-01-23 10:44 UTC|newest] Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top 2023-01-23 10:44 mengli.ming at outlook dot com [this message] 2023-01-29 13:25 ` [Bug analyzer/108492] " mengli.ming at outlook dot com
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