<html>
<head>
<base href="http://llvm.org/bugs/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Assertion `Section && "Cannot switch to a null section!"'"
href="http://llvm.org/bugs/show_bug.cgi?id=19049">19049</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Assertion `Section && "Cannot switch to a null section!"'
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</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>MC
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>nlewycky@google.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu, rafael.espindola@gmail.com
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>$ cat b.ll
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
module asm ".pushsection \22.debug_gdb_scripts\22, \22MS\22,%progbits,1"
module asm ".byte 1"
module asm ".asciz \22gdbscript\22"
module asm ".popsection"
$ llc b.ll
llc: MCAsmStreamer.cpp:321: virtual void
{anonymous}::MCAsmStreamer::ChangeSection(const llvm::MCSection*, const
llvm::MCExpr*): Assertion `Section && "Cannot switch to a null section!"'
failed.
0 llc 0x00000000018bdbfe llvm::sys::PrintStackTrace(_IO_FILE*) +
38
1 llc 0x00000000018bde7b
2 llc 0x00000000018bd815
3 libpthread.so.0 0x00007f1c6327acb0
4 libc.so.6 0x00007f1c625b2425 gsignal + 53
5 libc.so.6 0x00007f1c625b5b8b abort + 379
6 libc.so.6 0x00007f1c625ab0ee
7 libc.so.6 0x00007f1c625ab192
8 llc 0x0000000001664318
9 llc 0x0000000000b63877
10 llc 0x00000000012734f1
11 llc 0x0000000001276729
12 llc 0x0000000001249de5
13 llc 0x0000000001246b3e
14 llc 0x00000000011e1425
llvm::AsmPrinter::EmitInlineAsm(llvm::StringRef, llvm::MDNode const*,
llvm::InlineAsm::AsmDialect) const + 1341
15 llc 0x00000000011d1955
llvm::AsmPrinter::doInitialization(llvm::Module&) + 873
16 llc 0x00000000018342ae
llvm::FPPassManager::doInitialization(llvm::Module&) + 68
17 llc 0x0000000001834448
18 llc 0x0000000001834b94
llvm::legacy::PassManagerImpl::run(llvm::Module&) + 244
19 llc 0x0000000001834d9f
llvm::legacy::PassManager::run(llvm::Module&) + 39
20 llc 0x0000000000940a17
21 llc 0x000000000093fd4d main + 237
22 libc.so.6 0x00007f1c6259d76d __libc_start_main + 237
23 llc 0x000000000093d6f9
Stack dump:
0. Program arguments: llvm/Debug+Asserts/bin/llc b.ll
Aborted (core dumped)
I failed at getting this to happen with just llvm-mc though:
$ cat b.s
.pushsection ".debug_gdb_scripts", "MS",%progbits,1
.byte 1
.asciz "gdbscript"
.popsection
$ llvm-mc b.s
.text
.section .debug_gdb_scripts,"MS",@progbits,1
.byte 1
.ascii "gdbscript"
.byte 0
.text</pre>
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