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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Add strict checker for nullability"
href="https://bugs.llvm.org/show_bug.cgi?id=33280">33280</a>
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<th>Summary</th>
<td>Add strict checker for nullability
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>4.0
</td>
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<th>Hardware</th>
<td>Macintosh
</td>
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<th>OS</th>
<td>MacOS X
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>Static Analyzer
</td>
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<th>Assignee</th>
<td>kremenek@apple.com
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<th>Reporter</th>
<td>michael.eisel@gmail.com
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
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<p>
<div>
<pre>The _Nonnull and _Nullable annotations seem mainly focused on preventing the
literal "nil" being passed into a method or set for a nonnull property.
However, this is much more relaxed than Swift's null checking. It would be
great if we could statically analyze if what was being passed in as a nonnull
parameter was nonnull itself. It could recognize if a nullable variable was
being used in a way that made it nonnull.
For example:
if (!x) {
return;
}
[self runWithNonnullArg:x];
or
[self runWithNonnullArg:(x ?: @"")];
Both of these would be pass the static analysis.</pre>
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