[ELF] UNREACHABLE: "Invalid generic fixup size!"

[atrosinenko]

Trying to create ELF files for fold-move-imm.ll and jumptable-block-placement-bug.ll from llvm/test/CodeGen/EraVM yields an assertion:

$ ./bin/llc -filetype=obj -o /dev/null < ../llvm/test/CodeGen/EraVM/fold-move-imm.ll 
Invalid generic fixup size!
UNREACHABLE executed at /path/to/era-compiler-llvm/llvm/include/llvm/MC/MCFixup.h:111!
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace.
Stack dump:
0.      Program arguments: ./bin/llc -filetype=obj -o /dev/null
1.      Running pass 'Function Pass Manager' on module '<stdin>'.
2.      Running pass 'EraVM Assembly Printer' on function '@test_pos'
 #0 0x0000706e8a1d0334 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) /path/to/era-compiler-llvm/llvm/lib/Support/Unix/Signals.inc:602:13
 #1 0x0000706e8a1ce630 llvm::sys::RunSignalHandlers() /path/to/era-compiler-llvm/llvm/lib/Support/Signals.cpp:105:18
 #2 0x0000706e8a1d06b8 SignalHandler(int) /path/to/era-compiler-llvm/llvm/lib/Support/Unix/Signals.inc:413:1
 #3 0x0000706e88445320 (/lib/x86_64-linux-gnu/libc.so.6+0x45320)
 #4 0x0000706e8849eb1c __pthread_kill_implementation ./nptl/pthread_kill.c:44:76
 #5 0x0000706e8849eb1c __pthread_kill_internal ./nptl/pthread_kill.c:78:10
 #6 0x0000706e8849eb1c pthread_kill ./nptl/pthread_kill.c:89:10
 #7 0x0000706e8844526e raise ./signal/../sysdeps/posix/raise.c:27:6
 #8 0x0000706e884288ff abort ./stdlib/abort.c:81:7
 #9 0x0000706e8a12daff (/path/to/era-compiler-llvm/build/bin/../lib/libLLVM-17.so+0x152daff)
#10 0x0000706e8bb67dc9 llvm::MCObjectStreamer::flushPendingLabels(llvm::MCFragment*, unsigned long) /path/to/era-compiler-llvm/llvm/lib/MC/MCObjectStreamer.cpp:74:5
#11 0x0000706e8bb67dc9 llvm::MCObjectStreamer::emitValueImpl(llvm::MCExpr const*, unsigned int, llvm::SMLoc) /path/to/era-compiler-llvm/llvm/lib/MC/MCObjectStreamer.cpp:252:3
#12 0x0000706e8abeaad1 __gnu_cxx::__normal_iterator<llvm::MachineBasicBlock* const*, std::vector<llvm::MachineBasicBlock*, std::allocator<llvm::MachineBasicBlock*>>>::operator++() /usr/bin/../lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13/bits/stl_iterator.h:1111:2
#13 0x0000706e8abeaad1 llvm::AsmPrinter::emitJumpTableInfo() /path/to/era-compiler-llvm/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp:2628:39
#14 0x0000706e8abe6477 __gnu_cxx::__normal_iterator<llvm::AsmPrinter::HandlerInfo*, std::vector<llvm::AsmPrinter::HandlerInfo, std::allocator<llvm::AsmPrinter::HandlerInfo>>>::__normal_iterator(llvm::AsmPrinter::HandlerInfo* const&) /usr/bin/../lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13/bits/stl_iterator.h:1077:20
#15 0x0000706e8abe6477 std::vector<llvm::AsmPrinter::HandlerInfo, std::allocator<llvm::AsmPrinter::HandlerInfo>>::begin() /usr/bin/../lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13/bits/stl_vector.h:874:16
#16 0x0000706e8abe6477 llvm::AsmPrinter::emitFunctionBody() /path/to/era-compiler-llvm/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp:1903:30
#17 0x0000706e8c29c0f5 (anonymous namespace)::EraVMAsmPrinter::runOnMachineFunction(llvm::MachineFunction&) /path/to/era-compiler-llvm/llvm/lib/Target/EraVM/EraVMAsmPrinter.cpp:180:3
#18 0x0000706e8a6167ca llvm::MachineFunctionPass::runOnFunction(llvm::Function&) /path/to/era-compiler-llvm/llvm/lib/CodeGen/MachineFunctionPass.cpp:0:13
#19 0x0000706e8a340cd1 llvm::FPPassManager::runOnFunction(llvm::Function&) /path/to/era-compiler-llvm/llvm/lib/IR/LegacyPassManager.cpp:1435:27
#20 0x0000706e8a3471e2 llvm::FPPassManager::runOnModule(llvm::Module&) /path/to/era-compiler-llvm/llvm/lib/IR/LegacyPassManager.cpp:1481:13
#21 0x0000706e8a3413c4 (anonymous namespace)::MPPassManager::runOnModule(llvm::Module&) /path/to/era-compiler-llvm/llvm/lib/IR/LegacyPassManager.cpp:0:27
#22 0x0000706e8a3413c4 llvm::legacy::PassManagerImpl::run(llvm::Module&) /path/to/era-compiler-llvm/llvm/lib/IR/LegacyPassManager.cpp:535:44
#23 0x000055a80a50136a compileModule(char**, llvm::LLVMContext&) /path/to/era-compiler-llvm/llvm/tools/llc/llc.cpp:754:49
#24 0x000055a80a50136a main /path/to/era-compiler-llvm/llvm/tools/llc/llc.cpp:416:22
#25 0x0000706e8842a1ca __libc_start_call_main ./csu/../sysdeps/nptl/libc_start_call_main.h:74:3
#26 0x0000706e8842a28b call_init ./csu/../csu/libc-start.c:128:20
#27 0x0000706e8842a28b __libc_start_main ./csu/../csu/libc-start.c:347:5
#28 0x000055a80a4febd5 _start (./bin/llc+0xabd5)

The assertion seems to be triggered by emission of 32-byte wide relocations for jump table entries, similar to the following:

JTI1_0:
        .cell   @.BB1_5
        .cell   @.BB1_6
        .cell   @.BB1_7
        .cell   @.BB1_8

[atrosinenko]

Resolved by #534 some time ago.