<html>
    <head>
      <base href="https://bugs.llvm.org/">
    </head>
    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Segfault when evaluating STL expression"
   href="https://bugs.llvm.org/show_bug.cgi?id=39500">39500</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Segfault when evaluating STL expression
          </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>

        <tr>
          <th>OS</th>
          <td>All
          </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>ldionne@apple.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>llvm-bugs@lists.llvm.org
          </td>
        </tr></table>
      <p>
        <div>
        <pre>When evaluating some STL expression, lldb segfaults. This only seems to happen
with a recent Clang and LLDB, which may be related to the removal of
`always_inline` from libc++ shipped with recent Clangs.

This bug is a reduction of the STL-related failure that started happening in
<a href="http://green.lab.llvm.org/green/job/lldb-cmake/11896">http://green.lab.llvm.org/green/job/lldb-cmake/11896</a>.

Here's the reproduction (with Trunk Clang and LLDB):

```
#!/bin/sh

cat > t.cpp <<EOF
#include <cstdio>
#include <map>
#include <string>
int main() {
    std::string hello_world = "Hello World!";
    std::map<std::string, int> associative_array;
    associative_array[hello_world] = 1;
    associative_array.count(hello_world);
    std::printf("before returning....\n"); // Set break point at this line.
}
EOF

clang++ t.cpp -O0 -g
lldb a.out
```

Then, from within lldb:
```
breakpoint set -l 9
run
expr associative_array.count(hello_world)
expr associative_array.count(hello_world)
```

The evaluation works the first time around, but fails the second time around
with a segfault.</pre>
        </div>
      </p>


      <hr>
      <span>You are receiving this mail because:</span>

      <ul>
          <li>You are the assignee for the bug.</li>
      </ul>
    </body>
</html>