[llvm-dev] llvm bug 36466 fix

Sat Nov 3 06:50:57 PDT 2018

Hi

I come across the following exception when I use the llvm-dwarfdump
-debug-info target_binary:

llvm-dwarfdump: /home/linux/llvm-7/llvm/lib/MC/MCRegisterInfo.cpp:87: int
llvm::MCRegisterInfo::getLLVMRegNum(unsigned int, bool) const: Assertion `I
!= M+Size && I->FromReg == RegNum && "Invalid RegNum"' failed.
Stack dump:
0.      Program arguments: /home/linux/llvm-7/llvm/build/bin/llvm-dwarfdump
-debug-info C++/483.xalancbmk.O1
#0 0x000000000093ab37 llvm::sys::PrintStackTrace(llvm::raw_ostream&)
/home/linux/llvm-7/llvm/lib/Support/Unix/Signals.inc:490:0
#1 0x000000000093abca PrintStackTraceSignalHandler(void*)
/home/linux/llvm-7/llvm/lib/Support/Unix/Signals.inc:554:0
#2 0x00000000009388d8 llvm::sys::RunSignalHandlers()
/home/linux/llvm-7/llvm/lib/Support/Signals.cpp:67:0
#3 0x000000000093a531 SignalHandler(int)
/home/linux/llvm-7/llvm/lib/Support/Unix/Signals.inc:353:0
#4 0x00007f39f47d7390 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x11390)
#5 0x00007f39f374d428 gsignal
/build/glibc-Cl5G7W/glibc-2.23/signal/../sysdeps/unix/sysv/linux/raise.c:54:0
#6 0x00007f39f374f02a abort
/build/glibc-Cl5G7W/glibc-2.23/stdlib/abort.c:91:0
#7 0x00007f39f3745bd7 __assert_fail_base
/build/glibc-Cl5G7W/glibc-2.23/assert/assert.c:92:0
#8 0x00007f39f3745c82 (/lib/x86_64-linux-gnu/libc.so.6+0x2dc82)
#9 0x00000000006e6ba1 llvm::MCRegisterInfo::getLLVMRegNum(unsigned int,
bool) const /home/linux/llvm-7/llvm/lib/MC/MCRegisterInfo.cpp:88:0
#10 0x00000000004bd03e llvm::prettyPrintRegisterOp(llvm::raw_ostream&,
unsigned char, unsigned long*, llvm::MCRegisterInfo const*, bool)
/home/linux/llvm-7/llvm/lib/DebugInfo/DWARF/DWARFExpression.cpp:206:0
#11 0x00000000004bd226
llvm::DWARFExpression::Operation::print(llvm::raw_ostream&,
llvm::DWARFExpression const*, llvm::MCRegisterInfo const*, bool)
/home/linux/llvm-7/llvm/lib/DebugInfo/DWARF/DWARFExpression.cpp:237:0
#12 0x00000000004bd466 llvm::DWARFExpression::print(llvm::raw_ostream&,
llvm::MCRegisterInfo const*, bool) const
/home/linux/llvm-7/llvm/lib/DebugInfo/DWARF/DWARFExpression.cpp:264:0
#13 0x00000000004a8c68 dumpExpression(llvm::raw_ostream&,
llvm::ArrayRef<char>, bool, unsigned int, llvm::MCRegisterInfo const*)
/home/linux/llvm-7/llvm/lib/DebugInfo/DWARF/DWARFDebugLoc.cpp:38:0
#14 0x00000000004a8ea5
llvm::DWARFDebugLoc::LocationList::dump(llvm::raw_ostream&, bool, unsigned
int, llvm::MCRegisterInfo const*, unsigned long, unsigned int) const
/home/linux/llvm-7/llvm/lib/DebugInfo/DWARF/DWARFDebugLoc.cpp:45:0
#15 0x00000000004b331d dumpLocation(llvm::raw_ostream&,
llvm::DWARFFormValue&, llvm::DWARFUnit*, unsigned int, llvm::DIDumpOptions)
/home/linux/llvm-7/llvm/lib/DebugInfo/DWARF/DWARFDie.cpp:115:0
#16 0x00000000004b4034 dumpAttribute(llvm::raw_ostream&, llvm::DWARFDie
const&, unsigned int*, llvm::dwarf::Attribute, llvm::dwarf::Form, unsigned
int, llvm::DIDumpOptions)
/home/linux/llvm-7/llvm/lib/DebugInfo/DWARF/DWARFDie.cpp:243:0
#17 0x00000000004b5cd2 llvm::DWARFDie::dump(llvm::raw_ostream&, unsigned
int, llvm::DIDumpOptions) const
/home/linux/llvm-7/llvm/lib/DebugInfo/DWARF/DWARFDie.cpp:521:0
#18 0x00000000004b5db4 llvm::DWARFDie::dump(llvm::raw_ostream&, unsigned
int, llvm::DIDumpOptions) const
/home/linux/llvm-7/llvm/lib/DebugInfo/DWARF/DWARFDie.cpp:530:0
#19 0x00000000004b5db4 llvm::DWARFDie::dump(llvm::raw_ostream&, unsigned
int, llvm::DIDumpOptions) const
/home/linux/llvm-7/llvm/lib/DebugInfo/DWARF/DWARFDie.cpp:530:0
#20 0x00000000004b5db4 llvm::DWARFDie::dump(llvm::raw_ostream&, unsigned
int, llvm::DIDumpOptions) const
/home/linux/llvm-7/llvm/lib/DebugInfo/DWARF/DWARFDie.cpp:530:0
#21 0x0000000000445cdd llvm::DWARFCompileUnit::dump(llvm::raw_ostream&,
llvm::DIDumpOptions)
/home/linux/llvm-7/llvm/lib/DebugInfo/DWARF/DWARFCompileUnit.cpp:31:0
#22 0x00000000004482ad llvm::DWARFContext::dump(llvm::raw_ostream&,
llvm::DIDumpOptions, std::array<llvm::Optional<unsigned long>,
27ul>)::'lambda0'(bool, char const*, llvm::DWARFSection,
llvm::iterator_range<std::unique_ptr<llvm::DWARFCompileUnit,
std::default_delete<llvm::DWARFCompileUnit> >*>)::operator()(bool, char
const*, llvm::DWARFSection,
llvm::iterator_range<std::unique_ptr<llvm::DWARFCompileUnit,
std::default_delete<llvm::DWARFCompileUnit> >*>) const
/home/linux/llvm-7/llvm/lib/DebugInfo/DWARF/DWARFContext.cpp:351:0
#23 0x0000000000448e28 llvm::DWARFContext::dump(llvm::raw_ostream&,
llvm::DIDumpOptions, std::array<llvm::Optional<unsigned long>, 27ul>)
/home/linux/llvm-7/llvm/lib/DebugInfo/DWARF/DWARFContext.cpp:355:0
#24 0x0000000000414af6 dumpObjectFile(llvm::object::ObjectFile&,
llvm::DWARFContext&, llvm::Twine, llvm::raw_ostream&)
/home/linux/llvm-7/llvm/tools/llvm-dwarfdump/llvm-dwarfdump.cpp:424:0
#25 0x0000000000425d9a std::_Function_handler<bool
(llvm::object::ObjectFile&, llvm::DWARFContext&, llvm::Twine,
llvm::raw_ostream&), bool (*)(llvm::object::ObjectFile&,
llvm::DWARFContext&, llvm::Twine,
llvm::raw_ostream&)>::_M_invoke(std::_Any_data const&,
llvm::object::ObjectFile&, llvm::DWARFContext&, llvm::Twine&&,
llvm::raw_ostream&) /usr/include/c++/5/functional:1857:0
#26 0x0000000000420f69 std::function<bool (llvm::object::ObjectFile&,
llvm::DWARFContext&, llvm::Twine,
llvm::raw_ostream&)>::operator()(llvm::object::ObjectFile&,
llvm::DWARFContext&, llvm::Twine, llvm::raw_ostream&) const
/usr/include/c++/5/functional:2268:0
#27 0x0000000000415377 handleBuffer(llvm::StringRef, llvm::MemoryBufferRef,
std::function<bool (llvm::object::ObjectFile&, llvm::DWARFContext&,
llvm::Twine, llvm::raw_ostream&)>, llvm::raw_ostream&)
/home/linux/llvm-7/llvm/tools/llvm-dwarfdump/llvm-dwarfdump.cpp:472:0
#28 0x0000000000415ae2 handleFile(llvm::StringRef, std::function<bool
(llvm::object::ObjectFile&, llvm::DWARFContext&, llvm::Twine,
llvm::raw_ostream&)>, llvm::raw_ostream&)
/home/linux/llvm-7/llvm/tools/llvm-dwarfdump/llvm-dwarfdump.cpp:506:0
#29 0x00000000004170a4 main
/home/linux/llvm-7/llvm/tools/llvm-dwarfdump/llvm-dwarfdump.cpp:623:0
#30 0x00007f39f3738830 __libc_start_main
/build/glibc-Cl5G7W/glibc-2.23/csu/../csu/libc-start.c:325:0
#31 0x00000000004092e9 _start
(/home/linux/llvm-7/llvm/build/bin/llvm-dwarfdump+0x4092e9)
Aborted (core dumped)

After the google search. It seems that it should be an bug here
https://www.mail-archive.com/llvm-bugs@lists.llvm.org/msg21648.html

I am using llvm 7.0 and cross compiled the binary with linaro arm
toolchain(7.3.1). It takes me quiet a long time to compile and analysis the
bitcode. Are there any solutions on fixing this without re-compiling the
binary. Many Thanks

Regards
Muhui
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