<html>
<head>
<base href="https://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 --- - transparent_pointers not working"
href="https://llvm.org/bugs/show_bug.cgi?id=23299">23299</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>transparent_pointers not working
</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>normal
</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@cs.uiuc.edu
</td>
</tr>
<tr>
<th>Reporter</th>
<td>ribrdb@google.com
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>While working on a LanguageRuntime plugin for go, I noticed some strangeness
with ValueObjects for pointers.
If I use valobj.GetChildMemberWithName(...), it returns a child, but with the
wrong address so the value is unusable.
However, if I use valobj.Dereference()->GetChildMemberWithName(...) I can read
the data.
I think I've tracked this down to an interaction between
ValueObject::GetPointerValue and ValueObjectChild::UpdateValue:
- UpdateValue performs pointer arithmetic, saves the result in
m_value.GetScalar(), and sets the value type to an address (could be Host, Load
or FileAddress).
- However, GetPointerValue only uses m_value if the value type is
eValueTypeScalar or eValueTypeVector.
So at least in the case where the offset is != 0, GetPointerValue seems to be
returning something wrong.
Simply changing the value type to scalar doesn't work, because other code is
expecting it to be some sort of address.
Unfortunately I haven't found a way to reproduce this using the public api so I
can't write a test for it.</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>