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<base href="http://llvm.org/bugs/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - lldb doesn't report line number for NULL function pointer crash"
href="http://llvm.org/bugs/show_bug.cgi?id=17477">17477</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>lldb doesn't report line number for NULL function pointer crash
</td>
</tr>
<tr>
<th>Product</th>
<td>lldb
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>Macintosh
</td>
</tr>
<tr>
<th>OS</th>
<td>MacOS X
</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>kainjow@gmail.com
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>If a NULL function pointer is called, lldb does not report the line number
properly, however gdb does.
Here is sample code:
#include <stdio.h>
struct blah {
void (*asdf)();
};
int main() {
struct blah b;
b.asdf = NULL;
b.asdf();
return 0;
}
When I invoke lldb on the executable and 'run', then 'bt', it gives:
$ lldb Puke
Current executable set to 'Puke' (x86_64).
(lldb) run
Process 53327 launched: '/path/to/PUke' (x86_64)
Process 53327 stopped
* thread #1: tid = 0x37a5c9, 0x0000000000000000, queue =
'com.apple.main-thread, stop reason = EXC_BAD_ACCESS (code=1, address=0x0)
frame #0: 0x0000000000000000
error: memory read failed for 0x0
(lldb) bt
* thread #1: tid = 0x37a5c9, 0x0000000000000000, queue =
'com.apple.main-thread, stop reason = EXC_BAD_ACCESS (code=1, address=0x0)
frame #0: 0x0000000000000000
frame #1: 0x00007fff97ff47e1 libdyld.dylib`start + 1
Doing the same with gdb gives:
$ gdb Puke
(gdb) run
Starting program: /path/to/Puke
Reading symbols for shared libraries +.............................. done
Program received signal EXC_BAD_ACCESS, Could not access memory.
Reason: KERN_INVALID_ADDRESS at address: 0x0000000000000000
0x0000000000000000 in ?? ()
(gdb) bt
#0 0x0000000000000000 in ?? ()
#1 0x0000000100000f64 in main () at /path/to/main.c:11
(gdb)
lldb version lldb-300.5.46 (Xcode 5).</pre>
</div>
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