https://llvm.org/bugs/show_bug.cgi?id=28005
Bug ID: 28005
Summary: SimplifyCFG/SimplifyCleanupReturn: Use still stuck
around after Def is destroyed: cleanupret from
%cleanuppad2
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Transformation Utilities
Assignee: unassignedb...@nondot.org
Reporter: arie...@mail.tau.ac.il
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
Created attachment 16474
--> https://llvm.org/bugs/attachment.cgi?id=16474&action=edit
code that asserts when touched
Running the SimplifyCFG pass on the above IR causes an LLVM assertion to be
triggered.
I am trying to compile code that works with SEH exceptions on Windows. I am
cross-compiling from my Linux but it is broken in a similar way on Windows.
Expected Result:
Optimization Succeeds
Actual Result:
$ opt -version
LLVM (http://llvm.org/):
LLVM version 3.8.0
Optimized build with assertions.
Built May 21 2016 (13:09:50).
Default target: x86_64-unknown-linux-gnu
Host CPU: broadwell
$ opt simplify-cfg-assert.ll -simplifycfg -S
While deleting: token %cleanuppad2
Use still stuck around after Def is destroyed: cleanupret from %cleanuppad2
unwind label %bb18
Use still stuck around after Def is destroyed: cleanupret from %cleanuppad2
unwind label %bb18
opt: /opt/llvm/lib/IR/Value.cpp:82: virtual llvm::Value::~Value(): Assertion
`use_empty() && "Uses remain when a value is destroyed!"' failed.
0 opt 0x0000000001826fe5
llvm::sys::PrintStackTrace(llvm::raw_ostream&) + 37
1 opt 0x0000000001824956 llvm::sys::RunSignalHandlers() + 54
2 opt 0x0000000001824b6a
3 libpthread.so.0 0x00007f91f3127d30
4 libc.so.6 0x00007f91f230e478 gsignal + 56
5 libc.so.6 0x00007f91f230f8fa abort + 362
6 libc.so.6 0x00007f91f23073a7
7 libc.so.6 0x00007f91f2307452
8 opt 0x00000000017c33fb
9 opt 0x00000000015caaa7
10 opt 0x0000000001659b2c llvm::BasicBlock::~BasicBlock() + 140
11 opt 0x0000000001659dbb llvm::BasicBlock::eraseFromParent() + 139
12 opt 0x00000000005c1594
13 opt 0x00000000013c1d76
14 opt 0x00000000013c2d31 llvm::SimplifyCFG(llvm::BasicBlock*,
llvm::TargetTransformInfo const&, unsigned int, llvm::AssumptionCache*) + 65
15 opt 0x00000000013c0f02
16 opt 0x00000000013c2d31 llvm::SimplifyCFG(llvm::BasicBlock*,
llvm::TargetTransformInfo const&, unsigned int, llvm::AssumptionCache*) + 65
17 opt 0x00000000005c4e2c
18 opt 0x00000000013c1dcd
19 opt 0x00000000013c2d31 llvm::SimplifyCFG(llvm::BasicBlock*,
llvm::TargetTransformInfo const&, unsigned int, llvm::AssumptionCache*) + 65
20 opt 0x00000000011d6ff9
21 opt 0x0000000001796ca3
llvm::FPPassManager::runOnFunction(llvm::Function&) + 643
22 opt 0x0000000001796db9
llvm::legacy::FunctionPassManagerImpl::run(llvm::Function&) + 137
23 opt 0x0000000001796f04
llvm::legacy::FunctionPassManager::run(llvm::Function&) + 36
24 opt 0x00000000005d5d09 main + 7321
25 libc.so.6 0x00007f91f22fb610 __libc_start_main + 240
26 opt 0x0000000000615129 _start + 41
Stack dump:
0. Program arguments: opt simplify-cfg-assert.ll -simplifycfg -S -O3
1. Running pass 'Simplify the CFG' on function
'@_ZN4core4iter8iterator8Iterator4fold17h0471ccca27326883E'
Aborted
Backtrace on less-minified code:
#0 0x00007faab0f6f478 in __GI_raise (sig=sig@entry=6) at
../sysdeps/unix/sysv/linux/raise.c:55
#1 0x00007faab0f708fa in __GI_abort () at abort.c:89
#2 0x00007faab0f683a7 in __assert_fail_base (fmt=<optimized out>,
assertion=assertion@entry=0x7faaabbf0628 "use_empty() && \"Uses remain when
a value is destroyed!\"",
file=file@entry=0x7faaabbefe40 "llvm/lib/IR/Value.cpp", line=line@entry=82,
function=function@entry=0x7faaabbf29b0
<llvm::Value::~Value()::__PRETTY_FUNCTION__> "virtual llvm::Value::~Value()")
at assert.c:92
#3 0x00007faab0f68452 in __GI___assert_fail (assertion=0x7faaabbf0628
"use_empty() && \"Uses remain when a value is destroyed!\"",
file=0x7faaabbefe40 "llvm/lib/IR/Value.cpp", line=82,
function=0x7faaabbf29b0 <llvm::Value::~Value()::__PRETTY_FUNCTION__>
"virtual llvm::Value::~Value()") at assert.c:101
#4 0x00007faaaaf18f6b in llvm::Value::~Value() ()
from librustc_llvm-fe3cdf61.so
#5 0x00007faaa9c03237 in llvm::FuncletPadInst::~FuncletPadInst
(this=0x7faaa3ef7af8, __in_chrg=<optimized out>)
at llvm//include/llvm/IR/InstrTypes.h:1117
#6 llvm::CleanupPadInst::~CleanupPadInst (this=0x7faaa3ef7af8,
__in_chrg=<optimized out>)
at llvm//include/llvm/IR/Instructions.h:4030
#7 llvm::CleanupPadInst::~CleanupPadInst (this=0x7faaa3ef7af8,
__in_chrg=<optimized out>)
at llvm//include/llvm/IR/Instructions.h:4030
#8 0x00007faaaada3e4c in llvm::BasicBlock::~BasicBlock() ()
from librustc_llvm-fe3cdf61.so
#9 0x00007faaaada40db in llvm::BasicBlock::eraseFromParent() ()
from librustc_llvm-fe3cdf61.so
#10 0x00007faaa9bad62e in (anonymous
namespace)::SimplifyCFGOpt::SimplifyCleanupReturn(llvm::CleanupReturnInst*)
[clone .isra.636] [clone .constprop.703] ()
from librustc_llvm-fe3cdf61.so
#11 0x00007faaaaacb226 in (anonymous
namespace)::SimplifyCFGOpt::run(llvm::BasicBlock*) [clone .constprop.691] ()
from librustc_llvm-fe3cdf61.so
#12 0x00007faaaaacc1e1 in llvm::SimplifyCFG(llvm::BasicBlock*,
llvm::TargetTransformInfo const&, unsigned int, llvm::AssumptionCache*) ()
from librustc_llvm-fe3cdf61.so
#13 0x00007faaaaaca3b2 in (anonymous
namespace)::SimplifyCFGOpt::run(llvm::BasicBlock*) [clone .constprop.691] ()
from librustc_llvm-fe3cdf61.so
#14 0x00007faaaaacc1e1 in llvm::SimplifyCFG(llvm::BasicBlock*,
llvm::TargetTransformInfo const&, unsigned int, llvm::AssumptionCache*) ()
from librustc_llvm-fe3cdf61.so
#15 0x00007faaa9bb0ec6 in (anonymous
namespace)::SimplifyCFGOpt::SimplifySwitch(llvm::SwitchInst*,
llvm::IRBuilder<true, llvm::ConstantFolder,
llvm::IRBuilderDefaultInserter<true> >&) [clone .constprop.693] () from
librustc_llvm-fe3cdf61.so
#16 0x00007faaaaacb27d in (anonymous
namespace)::SimplifyCFGOpt::run(llvm::BasicBlock*) [clone .constprop.691] ()
from librustc_llvm-fe3cdf61.so
#17 0x00007faaaaacc1e1 in llvm::SimplifyCFG(llvm::BasicBlock*,
llvm::TargetTransformInfo const&, unsigned int, llvm::AssumptionCache*) ()
from librustc_llvm-fe3cdf61.so
#18 0x00007faaaa916ed9 in simplifyFunctionCFG(llvm::Function&,
llvm::TargetTransformInfo const&, llvm::AssumptionCache*, int) [clone
.constprop.113] ()
from librustc_llvm-fe3cdf61.so
#19 0x00007faaaaeec4d3 in llvm::FPPassManager::runOnFunction(llvm::Function&)
()
from librustc_llvm-fe3cdf61.so
#20 0x00007faaaaeec5e9 in
llvm::legacy::FunctionPassManagerImpl::run(llvm::Function&) ()
from librustc_llvm-fe3cdf61.so
#21 0x00007faaaaeec734 in
llvm::legacy::FunctionPassManager::run(llvm::Function&) ()
from librustc_llvm-fe3cdf61.so
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