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<base href="http://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - recursive types with typedefs do not resolve properly when printing type"
href="http://llvm.org/bugs/show_bug.cgi?id=20486">20486</a>
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</tr>
<tr>
<th>Summary</th>
<td>recursive types with typedefs do not resolve properly when printing type
</td>
</tr>
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<th>Product</th>
<td>lldb
</td>
</tr>
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<th>Version</th>
<td>unspecified
</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>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>All Bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>lldb-dev@cs.uiuc.edu
</td>
</tr>
<tr>
<th>Reporter</th>
<td>compnerd@compnerd.org
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>When attempting to print a recursive structure type in lldb built with
assertions, the following assertion is triggered in clang:
Assertion `ExternalFieldOffsets.find(Field) != ExternalFieldOffsets.end() &&
"Field does not have an external offset"' failed
Its unclear whether the assertion in clang is overly aggressive or if the lldb
construction of the type is at fault.
A reproduction for this issue is inlined below. Note that the separation of
the TUs is required for the reproduction:
#if defined(TU_ONE)
typedef struct t *tp;
typedef tp (*get_tp)();
struct s {
get_tp_p get_tp;
};
struct t {
struct s *s;
};
struct t t;
#elif defined(TU_TWO)
typedef struct t *tp;
extern struct t t;
int main() {
tp tpi = &t;
return 0;
}
#else
#error there are 2 tus
#endif
To reproduce, set a temporary breakpoint on main; run; next; p tpi; p *tpi
Immediately printing the structure recursively (p *tpi) will actually resolve
the structure layout and cache it, preventing the issue.</pre>
</div>
</p>
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