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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - lldb incorrectly reports multiple symbols when evaluating expressions (on Linux)"
href="https://bugs.llvm.org/show_bug.cgi?id=35043">35043</a>
</td>
</tr>
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<th>Summary</th>
<td>lldb incorrectly reports multiple symbols when evaluating expressions (on Linux)
</td>
</tr>
<tr>
<th>Product</th>
<td>lldb
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Windows NT
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>All Bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>lldb-dev@lists.llvm.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>davide@freebsd.org
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>I think this is a bug in the expression parser/symtab handling, but I can't say
for sure.
given the test in lambdas/main.cpp, after we set a breakpoint on the printf()
and we try to evaluate the lambda, we get:
(lldb) target create "made"
Current executable set to 'made' (x86_64).
(lldb) b main.cpp:14
Breakpoint 1: where = made`main + 32 at main.cpp:14, address =
0x00000000004005f0
(lldb) r
Process 32489 launched:
'/home/davide/work/llvm-lldb/tools/lldb/packages/Python/lldbsuite/test/lang/cpp/lambdas/made'
(x86_64)
Process 32489 stopped
* thread #1, name = 'made', stop reason = breakpoint 1.1
frame #0: 0x00000000004005f0 made`main(argc=1, argv=0x00007fffffffe128) at
main.cpp:14
11
12 int main (int argc, char const *argv[])
13 {
-> 14 printf("Stop here\n"); //% self.runCmd("expression auto $add =
[](int a, int b) { return a + b; }")
15 //% self.expect("expression $add(2,3)",
substrs = ['= 5'])
16 return 0;
17 }
(lldb) expression auto $add = [](int a, int b) { return a + b; }
error: Multiple internal symbols found for 'a'
id = {0x000003cf}, range = [0x00007ffff77ec290-0x00007ffff77ec298), name="a"
id = {0x0000051b}, range = [0x00007ffff77ec290-0x00007ffff77ec298), name="a"
id = {0x000000fe}, range = [0x00007ffff77ec290-0x00007ffff77ec298), name="a"
error: Multiple internal symbols found for 'b'
id = {0x0000051a}, range = [0x00007ffff77cfe70-0x00007ffff77cfe78), name="b"
id = {0x000003ce}, range = [0x00007ffff77cfe70-0x00007ffff77cfe78), name="b"
id = {0x000000fd}, range = [0x00007ffff77cfe70-0x00007ffff77cfe78), name="b"
I don't think that's quite right, as `b` is not really redefined, it's just a
temporary binding that we use for the lambda argument.
This requires a little more knowledge of the internals than I currently have,
so hints on where to look would be appreciated.
I can attach the ELF object, if it's helpful</pre>
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