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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 --- - Clang crashes when creating a this expression during template instantiation"
href="https://llvm.org/bugs/show_bug.cgi?id=28284">28284</a>
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</tr>
<tr>
<th>Summary</th>
<td>Clang crashes when creating a this expression during template instantiation
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<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>rtrieu@google.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>template <typename T>
struct Foo {
void (*function)() = [this]() -> void { auto x = s1.s2.ptr; };
struct S1 {
struct S2 {
int* ptr;
};
S2 s2;
};
S1 s1;
};
void run() { new Foo<int>(); }
>From lib/Sema/TreeTransform.h:
template<typename Derived>
ExprResult
TreeTransform<Derived>::TransformCXXThisExpr(CXXThisExpr *E) {
QualType T = getSema().getCurrentThisType();
if (!getDerived().AlwaysRebuild() && T == E->getType()) {
// Make sure that we capture 'this'.
getSema().CheckCXXThisCapture(E->getLocStart());
return E;
}
return getDerived().RebuildCXXThisExpr(E->getLocStart(), T, E->isImplicit());
}
In TransformCXXThisExpr, getSema().getCurrentType() returns a empty QualType.
This is passed to function RebuildCXXThisExpr, which expects the QualType to be
a valid Type.</pre>
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