<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 - Mishandling of uselistorder when there is a user of type blockaddress"
href="https://bugs.llvm.org/show_bug.cgi?id=48258">48258</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Mishandling of uselistorder when there is a user of type blockaddress
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>All
</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>LLVM assembly language parser
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>itay.bookstein@nextsilicon.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>The issue appears to be caused by trying to sort a uselistorder immediately
after parsing it. This mis-interacts with the blockaddress forward-decl
machinery, because the function is a declaration at this point (i.e. the V that
is passed to LLParser::sortUseListOrder), but the directive contains more
indices than uses which have already been materialized due to the forward-decl
machinery.
Reproduction below:
// repro.ll
@__irsym_main = hidden constant i32 (i32, i8**)* @main
@__irbb_main_LBB1 = hidden constant i8* blockaddress(@main, %main_LBB1)
declare i32 @rand()
declare i32 @putchar(i32)
define internal i32 @main(i32, i8** nocapture readnone) {
%3 = call i32 @rand()
%4 = icmp eq i32 %3, 5
br i1 %4, label %main_LBB1, label %main_LBB2
main_LBB1:
%5 = call i32 @putchar(i32 104)
br label %main_LBB2
main_LBB2:
ret i32 0
}
// repro.sh
bin/verify-uselistorder /local/users/itay/tmp/uselist/my.ll
// OUTPUT:
*** verify-uselistorder ***
verify bitcode
verify assembly
reverse
verify bitcode
verify assembly
verify-uselistorder: /tmp/uselistorder-4df326.ll:8:1: error: value only has one
use
uselistorder i32 (i32, i8**)* @main, { 1, 0 }
^
LLVM ERROR: parsing failed
PLEASE submit a bug report to <a href="https://bugs.llvm.org/">https://bugs.llvm.org/</a> and include the crash
backtrace.
Stack dump:
0. Program arguments: bin/verify-uselistorder
/local/users/itay/tmp/uselist/my.ll
#0 0x000000000101cf8a llvm::sys::PrintStackTrace(llvm::raw_ostream&, int)
/local/users/itay/Projects/llvm-project/llvm/lib/Support/Unix/Signals.inc:563:11
#1 0x000000000101d15b PrintStackTraceSignalHandler(void*)
/local/users/itay/Projects/llvm-project/llvm/lib/Support/Unix/Signals.inc:630:1
#2 0x000000000101b74b llvm::sys::RunSignalHandlers()
/local/users/itay/Projects/llvm-project/llvm/lib/Support/Signals.cpp:70:5
#3 0x000000000101d8ad SignalHandler(int)
/local/users/itay/Projects/llvm-project/llvm/lib/Support/Unix/Signals.inc:405:1
#4 0x00007f1184672730 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x12730)
#5 0x00007f1183f587bb raise
/build/glibc-vjB4T1/glibc-2.28/signal/../sysdeps/unix/sysv/linux/raise.c:51:1
#6 0x00007f1183f43535 abort /build/glibc-vjB4T1/glibc-2.28/stdlib/abort.c:81:7
#7 0x0000000000f54eb5 (bin/verify-uselistorder+0xf54eb5)
#8 0x0000000000f54d22
/local/users/itay/Projects/llvm-project/llvm/lib/Support/ErrorHandling.cpp:83:3
#9 0x00000000009c6104 verifyAfterRoundTrip(llvm::Module const&,
std::unique_ptr<llvm::Module, std::default_delete<llvm::Module> >)
/local/users/itay/Projects/llvm-project/llvm/tools/verify-uselistorder/verify-uselistorder.cpp:0:5
#10 0x00000000009c5c1b verifyAssemblyUseListOrder(llvm::Module const&)
/local/users/itay/Projects/llvm-project/llvm/tools/verify-uselistorder/verify-uselistorder.cpp:379:3
#11 0x00000000009c588e verifyUseListOrder(llvm::Module const&)
/local/users/itay/Projects/llvm-project/llvm/tools/verify-uselistorder/verify-uselistorder.cpp:387:1
#12 0x00000000009c568e main
/local/users/itay/Projects/llvm-project/llvm/tools/verify-uselistorder/verify-uselistorder.cpp:568:3
#13 0x00007f1183f4509b __libc_start_main
/build/glibc-vjB4T1/glibc-2.28/csu/../csu/libc-start.c:342:3
#14 0x00000000009c530a _start (bin/verify-uselistorder+0x9c530a)
fish: “bin/verify-uselistorder /local/…” terminated by signal SIGABRT (Abort)</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>