<html>
    <head>
      <base href="http://llvm.org/bugs/" />
    </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 --- - imprecise debug info for class initializer list (hurting asan reports)"
   href="http://llvm.org/bugs/show_bug.cgi?id=21737">21737</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>imprecise debug info for class initializer list (hurting asan reports)
          </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>Linux
          </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>C++
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>unassignedclangbugs@nondot.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>kcc@google.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>dblaikie@gmail.com, dgregor@apple.com, llvmbugs@cs.uiuc.edu, vonosmas@gmail.com
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr></table>
      <p>
        <div>
        <pre>When we have a long initializer list the debug info seems to point to the
opening "{" instead of the actual code in the initializer list.

I frequently hit this when analyzing asan/msan/tsan reports. 
E.g. this: 

% cat init-list.cc 
struct Foo {
  Foo(int *p)
      : a(p[0])
      , b(p[1])
      , c(p[2])
      , d(p[3])
      , e(p[4])
      , f(p[5])
      , g(p[6])
      , h(p[7])
  {}

  int a, b, c, d, e, f, g, h;
};

int x[SIZE];

int main()  {
  Foo foo(x);
}

% clang -g -DSIZE=3 -fsanitize=address  init-list.cc && ./a.out 
=================================================================
==20464==ERROR: AddressSanitizer: global-buffer-overflow on address ...
    #0 0x499c91 in Foo::Foo(int*) init-list.cc:11:3


No matter what SIZE is, i.e. where the bug happens, asan will point to "{}"</pre>
        </div>
      </p>
      <hr>
      <span>You are receiving this mail because:</span>
      
      <ul>
          <li>You are on the CC list for the bug.</li>
      </ul>
    </body>
</html>