<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 - Parser crashes with invalid syntax"
href="https://bugs.llvm.org/show_bug.cgi?id=44997">44997</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Parser crashes with invalid syntax
</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>-New Bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>nicolas.alvarez@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=23163" name="attach_23163" title="Stack dump of crash">attachment 23163</a> <a href="attachment.cgi?id=23163&action=edit" title="Stack dump of crash">[details]</a></span>
Stack dump of crash
While reducing a test case with creduce, I ended up with a totally unrelated
crash than what I was looking for.
The following 9 tokens of invalid code abort the clang parser by executing an
llvm_unreachable statement:
class {
a(struct b
struct b ;
The newlines are apparently significant. Since it's an llvm_unreachable, you
need asserts enabled to reproduce.
Output:
$ clang++ -fsyntax-only viewmodeE.cpp
viewmodeE.cpp:2:14: error: expected ';' after struct
a(struct b
^
;
viewmodeE.cpp:3:3: error: expected ')'
struct b ;
^
viewmodeE.cpp:2:5: note: to match this '('
a(struct b
^
viewmodeE.cpp:2:4: error: C++ requires a type specifier for all declarations
a(struct b
^
viewmodeE.cpp:3:10: error: 'b' redeclared with 'private' access
struct b ;
^
Invalid access specifier!
UNREACHABLE executed at ../llvm/tools/clang/lib/AST/DeclCXX.cpp:3165!
I bisected the crash back to this commit from 2016(!):
<a href="https://github.com/llvm/llvm-project/commit/078aea904331271c3fdc65b52d128a8acefe4e38">https://github.com/llvm/llvm-project/commit/078aea904331271c3fdc65b52d128a8acefe4e38</a>
Full stack trace attached.</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>