assert failed at X86FuncPrototypeDiscovery.cpp:227

[Mis012]

happened with first two random x86_64 binaries I tried, so statistically seems like it should be common, however
simple echo 'int main(int argc, char **argv) {printf("hello_world");}' >tst.c compiled with gcc is lifted without errors

llvm-mctoll: /llvm-project/llvm/tools/llvm-mctoll/X86/X86FuncPrototypeDiscovery.cpp:227: virtual llvm::FunctionType* llvm::mctoll::X86MachineInstructionRaiser::getRaisedFunctionPrototype(): Assertion `((OpType == MachineOperand::MachineOperandType::MO_Immediate) || (OpType == MachineOperand::MachineOperandType::MO_JumpTableIndex)) && "Unexpected block terminator found"' failed.

*** Please submit an issue at https://github.com/microsoft/llvm-mctoll
*** along with a back trace and a reproducer, if possible.
Stack dump:
0.	Program arguments: /llvm-project/build/bin/llvm-mctoll -d libsteam_api.so -I stub.h
 #0 0x0000559d56cc2844 PrintStackTraceSignalHandler(void*) Signals.cpp:0:0
 #1 0x0000559d56cc02eb SignalHandler(int) Signals.cpp:0:0
 #2 0x00007f069f242ee0 __restore_rt (/lib64/libc.so.6+0x3dee0)
 #3 0x00007f069f29547c __pthread_kill_implementation /usr/src/debug/glibc-2.37/nptl/pthread_kill.c:44:76
 #4 0x00007f069f242e16 gsignal /usr/src/debug/glibc-2.37/signal/../sysdeps/posix/raise.c:27:6
 #5 0x00007f069f22b89c abort /usr/src/debug/glibc-2.37/stdlib/abort.c:81:7
 #6 0x00007f069f22b7ab _nl_load_domain.cold /usr/src/debug/glibc-2.37/intl/loadmsgcat.c:1196:9
 #7 0x00007f069f23b216 (/lib64/libc.so.6+0x36216)
 #8 0x0000559d573101fb llvm::mctoll::X86MachineInstructionRaiser::getRaisedFunctionPrototype() (/llvm-project/build/bin/llvm-mctoll+0x157c1fb)
 #9 0x0000559d572d8e5d llvm::mctoll::ModuleRaiser::runMachineFunctionPasses() (/llvm-project/build/bin/llvm-mctoll+0x1544e5d)
#10 0x0000559d5649ef80 disassembleObject(llvm::object::ObjectFile const*, bool) (.constprop.0) llvm-mctoll.cpp:0:0
#11 0x0000559d56442225 main (/llvm-project/build/bin/llvm-mctoll+0x6ae225)
#12 0x00007f069f22caf0 __libc_start_call_main /usr/src/debug/glibc-2.37/csu/../sysdeps/nptl/libc_start_call_main.h:74:3
#13 0x00007f069f22cbb9 call_init /usr/src/debug/glibc-2.37/csu/../csu/libc-start.c:128:20
#14 0x00007f069f22cbb9 __libc_start_main@GLIBC_2.2.5 /usr/src/debug/glibc-2.37/csu/../csu/libc-start.c:347:5
#15 0x0000559d5648db75 _start /home/abuild/rpmbuild/BUILD/glibc-2.37/csu/../sysdeps/x86_64/start.S:117:0
Aborted (core dumped)

[Mis012]

example binary:
libsteam_api.so.gz

following supplied with -I:

#define _GNU_SOURCE

#define __fortify_function
#define __USE_FORTIFY_LEVEL 3 // > 1
#include <stdio.h>
#include <stdlib.h>
#include <bits/stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <ctype.h>
#include <string.h>
#include <sys/stat.h>
#include <dlfcn.h>
#include <unwind.h>
#include <math.h>
#include <errno.h>
#include <pthread.h>
#include <signal.h>


#include "/usr/include/c++/10/x86_64-suse-linux/bits/os_defines.h"
#include "/usr/include/c++/10/x86_64-suse-linux/bits/c++config.h"
#include <c++/10/cxxabi.h>

extern int __fprintf_chk (FILE *__restrict __stream, int __flag,
			  const char *__restrict __format, ...);
extern int __printf_chk (int __flag, const char *__restrict __format, ...);
extern int __vfprintf_chk (FILE *__restrict __stream, int __flag,
			   const char *__restrict __format, __gnuc_va_list __ap);
extern int __vprintf_chk (int __flag, const char *__restrict __format,
			  __gnuc_va_list __ap);

void __stack_chk_fail(void);

[bharadwajy]

Thanks for your interest in the project and the bug report.

I will plan to triage the issue.