fix: added initial implementation for supporting internal function definitions

[arteevraina]

Towards: #2006

[certik]

We are getting some error messages at the CI:

Internal Compiler Error: Unhandled exception
Traceback (most recent call last):
  Binary file "/home/runner/work/lpython/lpython/src/bin/lpython", local address: 0x9a01d4
  Binary file "/lib/x86_64-linux-gnu/libc.so.6", local address: 0x29e3f
  Binary file "/lib/x86_64-linux-gnu/libc.so.6", local address: 0x29d8f
  Binary file "/home/runner/work/lpython/lpython/src/bin/lpython", local address: 0x9afc09
  Binary file "/home/runner/work/lpython/lpython/src/bin/lpython", local address: 0x9a71c7
  Binary file "/home/runner/work/lpython/lpython/src/bin/lpython", local address: 0xa7699d
  Binary file "/home/runner/work/lpython/lpython/src/bin/lpython", local address: 0xa76344
  Binary file "/home/runner/work/lpython/lpython/src/bin/lpython", local address: 0xaac25c
  Binary file "/home/runner/work/lpython/lpython/src/bin/lpython", local address: 0xadf5ed
  Binary file "/home/runner/work/lpython/lpython/src/bin/lpython", local address: 0xa8aafd
  Binary file "/home/runner/work/lpython/lpython/src/bin/lpython", local address: 0xaaef5f
  Binary file "/home/runner/work/lpython/lpython/src/bin/lpython", local address: 0xadf5ed
  Binary file "/home/runner/work/lpython/lpython/src/bin/lpython", local address: 0xa8ad19
LCompilersException: visit_Pass() not implemented
make[2]: *** [CMakeFiles/const_03_FAST.dir/build.make:74: const_03_FAST.o] Error 1

Not sure where they care coming from, but we need to fix it.

[arteevraina]

Hi @certik ,

The remaining CI's are failing and giving this as stacktrace:

Traceback (most recent call last):
+ rm -rf /Users/runner/work/lpython/lpython/integration_tests/_lpython-tmp-test-wasm_x86
  File "ci/test.xsh", line 26, in <module>
+ rm -rf /Users/runner/work/lpython/lpython/integration_tests/_lpython-tmp-test-wasm_x64
  File "/usr/local/miniconda/envs/test/lib/python3.10/site-packages/xonsh/built_ins.py", line 196, in subproc_captured_hiddenobject
+ rm -rf /Users/runner/work/lpython/lpython/integration_tests/_lpython-tmp-test-c_py
    return xonsh.procs.specs.run_subproc(cmds, captured="hiddenobject", envs=envs)
+ rm -rf /Users/runner/work/lpython/lpython/integration_tests/_lpython-tmp-test-c_sym
  File "/usr/local/miniconda/envs/test/lib/python3.10/site-packages/xonsh/procs/specs.py", line 900, in run_subproc
+ rm -rf /Users/runner/work/lpython/lpython/integration_tests/_lpython-tmp-test-cpython_sym
    return _run_specs(specs, cmds)
+ mkdir /Users/runner/work/lpython/lpython/integration_tests/_lpython-tmp-test-llvm
  File "/usr/local/miniconda/envs/test/lib/python3.10/site-packages/xonsh/procs/specs.py", line 933, in _run_specs
+ cmake -DKIND=llvm -DFAST=yes -DPYTHON_LIBS_REQ=no ..
    command.end()
+ make -j16
  File "/usr/local/miniconda/envs/test/lib/python3.10/site-packages/xonsh/procs/pipelines.py", line 458, in end
Command failed: make -j16
    self._end(tee_output=tee_output)
ci/test.xsh:7:src/bin/lpython --version
  File "/usr/local/miniconda/envs/test/lib/python3.10/site-packages/xonsh/procs/pipelines.py", line 477, in _end
ci/test.xsh:9:src/bin/lpython -c examples/expr2.py -o expr2.o
    self._raise_subproc_error()
ci/test.xsh:10:src/bin/lpython -o expr2 expr2.o
  File "/usr/local/miniconda/envs/test/lib/python3.10/site-packages/xonsh/procs/pipelines.py", line 599, in _raise_subproc_error
ci/test.xsh:11:./expr2
    raise subprocess.CalledProcessError(rtn, spec.args, output=self.output)
ci/test.xsh:14:src/bin/lpython --show-ast tests/doconcurrentloop_01.py
subprocess.CalledProcessError: Command '['python', 'run_tests.py', '-j16', '-b', 'llvm', 'cpython', 'c', 'wasm', '-f']' returned non-zero exit status 1.

make[2]: *** [func_internal_def_01_FAST.o] Segmentation fault: 11
[ 95%] Generating bit_operations_i32_FAST.o
make[1]: *** [CMakeFiles/func_internal_def_01_FAST.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....

I think tests are still trying to generate C code and then the missing implementation error comes in for the internally defined functions.

Can these error be possible because of this as it is trying to generate C code ?

[arteevraina]

I have removed it to test 551997b. Let's see if ci works now.

[certik]

The failure is:

make[2]: *** [CMakeFiles/func_internal_def_01_FAST.dir/build.make:74: func_internal_def_01_FAST.o] Segmentation fault (core dumped)
make[1]: *** [CMakeFiles/Makefile2:5822: CMakeFiles/func_internal_def_01_FAST.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....

[arteevraina]

Hi @certik ,
Sorry, tried updating this branch with base branch and forced pushed without pulling your changes. Sorry about that.
But, I have added those changes in my new commits and marked this PR as ready for review.