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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - LLDB fails to evaluate expression with template class type"
href="https://bugs.llvm.org/show_bug.cgi?id=42920">42920</a>
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<th>Summary</th>
<td>LLDB fails to evaluate expression with template class type
</td>
</tr>
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<th>Product</th>
<td>lldb
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>All Bugs
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<th>Assignee</th>
<td>lldb-dev@lists.llvm.org
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</tr>
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<th>Reporter</th>
<td>sfunkenhauser@google.com
</td>
</tr>
<tr>
<th>CC</th>
<td>jdevlieghere@apple.com, llvm-bugs@lists.llvm.org
</td>
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<p>
<div>
<pre>LLDB fails to evaluate expressions with template class types.
Simple example:
template <typename T> class foo
{
uint32_t data;
};
foo<int> test;
int main() {
return 0;
}
I set a breakpoint on main and try to evaluate the following expression:
(lldb) p sizeof(foo<int>)
error: implicit instantiation of undefined template 'foo<int>'
template is declared here
The debug information is available (It's not being optimized out), and printing
'test' works just fine:
$ readelf --debug-dump a.out | grep foo
<41> DW_AT_name : (indirect string, offset: 0xa): foo<int>
<49> DW_AT_name : (indirect string, offset: 0x0): foo
3f foo<int>
Quoting Jim Ingham from a discussion on lldb-dev@
"LLDB uses clang as its expression parser, which when it sees foo<int>
apparently wants to find a decl called "foo" first, which we don't really have
in the abstract."</pre>
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</p>
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