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<base href="http://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Null pointer crash caused by dyn_cast InheritanceGraphViewer"
href="http://bugs.llvm.org/show_bug.cgi?id=32095">32095</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Null pointer crash caused by dyn_cast InheritanceGraphViewer
</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>
<tr>
<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Frontend
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>arphaman@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
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<pre>Clang crashes when trying to generate inheritance graph for the record 'C' from
the following code:
template <class T> struct A {};
template <class U> class C: A<U>{};
Sample code from AST Visitor that reproduces this problem:
bool Visitor::VisitCXXRecordDecl(clang::CXXRecordDecl *c) {
if (c->getNumBases() || c->getNumVBases()) {
c->viewInheritance(astContext);
}
return true;
}
Backtrace:
* frame #0: 0x000000010089f970
libclang.dylib`clang::TagType::getDecl(this=0x0000000000000000) const + 16 at
Type.cpp:3018
frame #1: 0x00000001003dfbd5
libclang.dylib`clang::RecordType::getDecl(this=0x0000000000000000) const + 21
at Type.h:3760
frame #2: 0x00000001007aba01 libclang.dylib`(anonymous
namespace)::InheritanceHierarchyWriter::WriteNode(this=0x00007fff5fbfd5b0,
Type=QualType @ 0x00007fff5fbfd130, FromVirtual=false) + 2641 at
InheritViz.cpp:95
frame #3: 0x00000001007aaee2 libclang.dylib`(anonymous
namespace)::InheritanceHierarchyWriter::WriteGraph(this=0x00007fff5fbfd5b0,
Type=QualType @ 0x00007fff5fbfd538) + 146 at InheritViz.cpp:47
frame #4: 0x00000001007aad64
libclang.dylib`clang::CXXRecordDecl::viewInheritance(this=0x0000000110809150,
Context=0x000000010f805600) const + 564 at InheritViz.cpp:153
The problem is caused by this dyn_cast from InheritViz.cpp:
const CXXRecordDecl *Decl
= static_cast<const CXXRecordDecl *>(Type->getAs<RecordType>()->getDecl());
The actual type is:
InjectedClassNameType 0x7f868380e7d0 'C<U>' dependent
`-CXXRecord 0x7f868380e550 'C'</pre>
</div>
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