Error executing run_vtr_flow with -start yosys

[ept221]

There seems to be an issue with running the basic usage example for run_vtr_flow with -start yosys.

Expected Behaviour

In the docs, the example invocation for running VTR with Yosys as the front-end is: ./run_vtr_flow PATH_TO_VERILOG_FILE.v PATH_TO_ARCH_FILE.xml -start yosys. This should run without error.

Current Behaviour

Instead, when that command is invoked, Python produces a traceback to an error:

Traceback (most recent call last):
  File "../vtr_flow/scripts/run_vtr_flow.py", line 807, in <module>
    sys.exit(vtr_command_main(sys.argv[1:], prog=sys.argv[0]))
  File "../vtr_flow/scripts/run_vtr_flow.py", line 546, in vtr_command_main
    vtr.run(
  File "/home/ept/tools/vtr-verilog-to-routing/vtr_flow/scripts/python_libs/vtr/flow.py", line 213, in run
    vtr.yosys.run(
  File "/home/ept/tools/vtr-verilog-to-routing/vtr_flow/scripts/python_libs/vtr/yosys/yosys.py", line 191, in run
    shutil.copyfile(yosys_base_models, yosys_models_full_path)
  File "/home/ept/miniconda3/envs/vtr/lib/python3.8/shutil.py", line 264, in copyfile
    with open(src, 'rb') as fsrc, open(dst, 'wb') as fdst:
FileNotFoundError: [Errno 2] No such file or directory: '/home/ept/tools/vtr-verilog-to-routing/vtr_flow/scripts/temp/yosys_models.v'

The issue appears to be in vtr_flow/scripts/python_libs/vtr/yosys/yosys.py. Beginning at line 190, there appear to be various paths with a name: *_full_path. I believe these are paths are for copying files into the temp_dir that gets created during this flow. However, appended to many of these paths is: vtr.paths.scripts_path which I believe is a mistake. In my case, printing vtr.paths.scripts_path out yields: /home/ept/tools/vtr-verilog-to-routing/vtr_flow/scripts. So it looks like the script is trying to copy files into /home/ept/tools/vtr-verilog-to-routing/vtr_flow/scripts/temp instead of my_invocation_dir/temp/ (where my_invocation_dir is the directory where I invoked vtr_flow).

Possible Solution

I think this should be as easy as removing vtr.paths.scripts_path from the beginning of the target paths. I would have created a PR, but wasn't sure I had this right.

Steps to Reproduce

1. cd $VTR_ROOT
2. mkdir stuff
3. cd stuff
4. ../vtr_flow/scripts/run_vtr_flow.py $VTR_ROOT/doc/src/quickstart/blink.v ../vtr_flow/arch/timing/EArch.xml -start yosys

Context

Your Environment

• VTR revision used: 2f34458
• Operating System and version: Ubuntu 20.04.4 LTS
• Compiler version: gcc version 9.4.0

[ept221]

One workaround to this is to specify a full path to the temp dir with -temp_dir. For example: ./run_vtr_flow PATH_TO_VERILOG_FILE.v PATH_TO_ARCH_FILE.xml -start yosys -temp_dir /full/path/to/temp_dir. It must be a full path, or else the same errors occur.

[farukyld]

I am also able to resolve this by replacing this line

    architecture_file_path = str(vtr.paths.scripts_path / architecture_file)

with this:

architecture_file_path = str(architecture_file)

in this file: vtr-verilog-to-routing/vtr_flow/scripts/python_libs/vtr/parmys/parmys.py line 212 at this commit:

#23535b02bb3afde26daf9d3887606c9e21192311