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<base href="https://bugs.llvm.org/">
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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 - Inline assembly referencing a local goto label without any labels given crashes LLVM"
href="https://bugs.llvm.org/show_bug.cgi?id=38718">38718</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Inline assembly referencing a local goto label without any labels given crashes LLVM
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>6.0
</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>Backend: X86
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>emil.gedda@emilgedda.se
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=20776" name="attach_20776" title="crashing example">attachment 20776</a> <a href="attachment.cgi?id=20776&action=edit" title="crashing example">[details]</a></span>
crashing example
Trying to use "outs %l0 %w1" in inline assembly crashes LLVM.
The culprit in this case is the "%l0" which references a goto label when none
was given.
How to reproduce:
See below
Expected behaviour:
An error explaining that you cant reference labels using "%l" without the
goto qualifier on the inline assembly,
and if possible tell the user "did you forget the goto qualifier?" (even
though goto qualifiers are not supported yet).
Actual behaviour:
Compiling with clang++ and without optimizations segfaults LLVM, with
optimizations it crashes with out of memory.
Compiling directly with llc gives "No such file or directory", and then
segfaults.
Repro:
$ cat bugpoint-reduced-simplified.ll
; ModuleID = 'bugpoint-reduced-simplified.bc'
source_filename = "bugpoint-output-9760709.bc"
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-pc-linux-gnu"
; Function Attrs: norecurse nounwind optsize sspstrong uwtable
define void @main() local_unnamed_addr #0 {
tail call void asm sideeffect "outs ${0:l}, ${1:w}",
"{ax},N{dx},~{dirflag},~{fpsr},~{flags}"(i8* null, i32 0) #1, !srcloc !1
ret void
}
!llvm.ident = !{!0}
!0 = !{!"clang version 6.0.1 (tags/RELEASE_601/final)"}
!1 = !{i32 26}
$ llc bugpoint-reduced-simplified.ll
LLVMSymbolizer: error reading file: No such file or directory
#0 0x00007f8d747157cb llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/usr/bin/../lib/libLLVM-6.0.so+0x8517cb)
#1 0x00007f8d747134be llvm::sys::RunSignalHandlers()
(/usr/bin/../lib/libLLVM-6.0.so+0x84f4be)
#2 0x00007f8d7471372b (/usr/bin/../lib/libLLVM-6.0.so+0x84f72b)
#3 0x00007f8d73ba8e00 __restore_rt (/usr/bin/../lib/libc.so.6+0x37e00)
#4 0x00007f8d7499b3dc llvm::MachineBasicBlock::getSymbol() const
(/usr/bin/../lib/libLLVM-6.0.so+0xad73dc)
#5 0x00007f8d74dc5c32 llvm::AsmPrinter::EmitInlineAsm(llvm::MachineInstr
const*) const (/usr/bin/../lib/libLLVM-6.0.so+0xf01c32)
#6 0x00007f8d74dba824 llvm::AsmPrinter::EmitFunctionBody()
(/usr/bin/../lib/libLLVM-6.0.so+0xef6824)
#7 0x00007f8d763926bd (/usr/bin/../lib/libLLVM-6.0.so+0x24ce6bd)
#8 0x00007f8d749e66d0
llvm::MachineFunctionPass::runOnFunction(llvm::Function&)
(/usr/bin/../lib/libLLVM-6.0.so+0xb226d0)
#9 0x00007f8d747fbaf8 llvm::FPPassManager::runOnFunction(llvm::Function&)
(/usr/bin/../lib/libLLVM-6.0.so+0x937af8)
#10 0x00007f8d747fbb72 llvm::FPPassManager::runOnModule(llvm::Module&)
(/usr/bin/../lib/libLLVM-6.0.so+0x937b72)
#11 0x00007f8d747fb204 llvm::legacy::PassManagerImpl::run(llvm::Module&)
(/usr/bin/../lib/libLLVM-6.0.so+0x937204)
#12 0x000055bb7b65d63d (llc+0x2163d)
#13 0x000055bb7b651d65 (llc+0x15d65)
#14 0x00007f8d73b95223 __libc_start_main (/usr/bin/../lib/libc.so.6+0x24223)
#15 0x000055bb7b651f3e (llc+0x15f3e)
Stack dump:
0. Program arguments: llc bugpoint-reduced-simplified.ll
1. Running pass 'Function Pass Manager' on module
'bugpoint-reduced-simplified.ll'.
2. Running pass 'X86 Assembly Printer' on function '@main'
[1] 7997 segmentation fault (core dumped) llc
bugpoint-reduced-simplified.ll</pre>
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