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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [analyzer] EnumCastOutOfRange false-positive for bitmasks"
href="https://bugs.llvm.org/show_bug.cgi?id=49381">49381</a>
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<th>Summary</th>
<td>[analyzer] EnumCastOutOfRange false-positive for bitmasks
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<th>Product</th>
<td>clang
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<th>Version</th>
<td>11.0
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<th>Hardware</th>
<td>PC
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>enhancement
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>Static Analyzer
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<th>Assignee</th>
<td>dcoughlin@apple.com
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<th>Reporter</th>
<td>balazs.benics@sigmatechnology.se
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<th>CC</th>
<td>dcoughlin@apple.com, llvm-bugs@lists.llvm.org
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<p>
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<pre>The EnumCastOutOfRange checker emits a warning for this code:
// -std=c++17 -Xclang -analyze -Xclang
-analyzer-checker=core,alpha.cplusplus.EnumCastOutOfRange -Xclang
-analyzer-output=text
<a href="https://godbolt.org/z/xosTxq">https://godbolt.org/z/xosTxq</a>
enum TestEnum {
A = 0,
B = 1,
C = 2,
D = 4,
};
void bitmasks() {
static_assert((B | C | D) == 7);
TestEnum t = static_cast<TestEnum>(7); // should not warn
(void)t;
}
The checker should recognize the bitmask and check the bounds accordingly.
/CC Endre Fülöp, the co-author of the checker</pre>
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