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<base href="https://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Crash in tryEvaluateBuiltinObjectSize on invalid FieldDecl's"
href="https://llvm.org/bugs/show_bug.cgi?id=28314">28314</a>
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<th>Summary</th>
<td>Crash in tryEvaluateBuiltinObjectSize on invalid FieldDecl's
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>All
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Frontend
</td>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>vsk@apple.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>The latest ToT clang crashes on the following input [1]:
```
$ clang -cc1 -emit-obj -o /dev/null -x c - <<EOF
struct A {
struct B b;
char c[1];
};
void d(struct A *a) {
__builtin_object_size(a->c, 1), "";
}
EOF
```
Assertion failed: (!D->isInvalidDecl() && "Cannot get layout of invalid
decl!"), function getASTRecordLayout
One hacky fix is to change ``IsLastFieldDecl`` to ``IsLastOrInvalidFieldDecl``,
and conservatively return true if ``FD->getParent()->isInvalidDecl()``.
However, that fix doesn't explain why the comma and the string literal
following the call to __builtin_object_size() in this test case are
significant.
[1] CReduced from <a href="https://twitter.com/endrift/status/724273399191605248">https://twitter.com/endrift/status/724273399191605248</a>.</pre>
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