Raising Go binary - Assertion failed: No called function prototype found while determining return type

[xaionaro]

$ cat > hello.go <<EOF
package main
import "fmt"
func main() {
        fmt.Println("Hello, world!")
}
$ go version && go build
go version go1.13 linux/amd64
$ ~/src/llvm-project/build/bin/llvm-mctoll -d helloworld 
llvm-mctoll: /home/xaionaro/src/llvm-project/llvm/tools/llvm-mctoll/X86/X86FuncPrototypeDiscovery.cpp:612: llvm::Type* X86MachineInstructionRaiser::getReturnTypeFromMBB(const llvm::MachineBasicBlock&, bool&): Assertion `(CalledFunc != nullptr) && "No called function prototype found while determining return type"' failed.
 #0 0x000000000102061a llvm::sys::PrintStackTrace(llvm::raw_ostream&) (/home/xaionaro/src/llvm-project/build/bin/llvm-mctoll+0x102061a)
 #1 0x000000000101e604 llvm::sys::RunSignalHandlers() (/home/xaionaro/src/llvm-project/build/bin/llvm-mctoll+0x101e604)
 #2 0x000000000101eb0d SignalHandler(int) (/home/xaionaro/src/llvm-project/build/bin/llvm-mctoll+0x101eb0d)
 #3 0x00007fdcbaf00b20 __restore_rt (/lib64/libpthread.so.0+0x14b20)
 #4 0x00007fdcba9a7625 raise (/lib64/libc.so.6+0x3c625)
 #5 0x00007fdcba9908d9 abort (/lib64/libc.so.6+0x258d9)
 #6 0x00007fdcba9907a9 _nl_load_domain.cold (/lib64/libc.so.6+0x257a9)
 #7 0x00007fdcba99fa66 (/lib64/libc.so.6+0x34a66)
 #8 0x0000000001046b3c X86MachineInstructionRaiser::getReturnTypeFromMBB(llvm::MachineBasicBlock const&, bool&) (/home/xaionaro/src/llvm-project/build/bin/llvm-mctoll+0x1046b3c)
 #9 0x0000000001046b8e X86MachineInstructionRaiser::getReachingReturnType(llvm::MachineBasicBlock const&) (/home/xaionaro/src/llvm-project/build/bin/llvm-mctoll+0x1046b8e)
#10 0x0000000001047d25 X86MachineInstructionRaiser::getFunctionReturnType() (/home/xaionaro/src/llvm-project/build/bin/llvm-mctoll+0x1047d25)
#11 0x0000000001048d78 X86MachineInstructionRaiser::getRaisedFunctionPrototype() (/home/xaionaro/src/llvm-project/build/bin/llvm-mctoll+0x1048d78)
#12 0x00000000004896ba ModuleRaiser::runMachineFunctionPasses() (/home/xaionaro/src/llvm-project/build/bin/llvm-mctoll+0x4896ba)
#13 0x000000000044fbc6 DisassembleObject(llvm::object::ObjectFile const*, bool) (.constprop.0) (/home/xaionaro/src/llvm-project/build/bin/llvm-mctoll+0x44fbc6)
#14 0x000000000040c5a4 main (/home/xaionaro/src/llvm-project/build/bin/llvm-mctoll+0x40c5a4)
#15 0x00007fdcba9921a3 __libc_start_main (/lib64/libc.so.6+0x271a3)
#16 0x000000000043cede _start (/home/xaionaro/src/llvm-project/build/bin/llvm-mctoll+0x43cede)
Stack dump:
0.      Program arguments: /home/xaionaro/src/llvm-project/build/bin/llvm-mctoll -d helloworld 
Aborted (core dumped)
$ ~/src/llvm-project/build/bin/llvm-mctoll --version
LLVM (http://llvm.org/):
  LLVM version 11.0.0git
  Optimized build with assertions.
  Default target: x86_64-unknown-linux-gnu
  Host CPU: skylake

  Registered Targets:
    arm     - ARM
    armeb   - ARM (big endian)
    thumb   - Thumb
    thumbeb - Thumb (big endian)
    x86     - 32-bit X86: Pentium-Pro and above
    x86-64  - 64-bit X86: EM64T and AMD64

[bharadwajy]

Thank you very much for trying out the tool and for the bug report.

It is really encouraging to get a scenario that attempts to raise a Go binary - which we have not yet tried.

Look forward fixing this bug as time permits, but would welcome any kind help with a patch from anyone interested.

Thanks!

PS: I modified the bug title to indicate that this is a failure on Go binary.