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Added netlistsvg wrapper/generator #247

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Added netlistsvg wrapper/generator #247

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3a9fef6
Added netlistsvg wrapper/generator
wgryncewicz Nov 13, 2020
17c37e1
Moved to argparse, pathlib, subprocess
wgryncewicz Nov 18, 2020
da5a537
Netlistsvg wrapper moved and renamed
wgryncewicz Nov 25, 2020
35187a3
Added json patching option for minor netlistsvg incompatibilities
wgryncewicz Dec 29, 2020
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Added json patching option for minor netlistsvg incompatibilities 
Signed-off-by: Wojciech Gryncewicz <wgryncewicz@antmicro.com>
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@wgryncewicz
wgryncewicz committed Dec 29, 2020
commit 35187a347912df5248fbd5b493db4d5f5634c9d1
54 changes: 51 additions & 3 deletions scripts/python-skywater-pdk/skywater_pdk/cell/generate/netlist.py
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Original file line number Diff line number Diff line change
Expand Up @@ -18,6 +18,7 @@
import pathlib
import glob
import subprocess
import re

def outfile(cellpath, define_data, ftype='', extra='', exists=False):
''' Determines output file path and name.
Expand Down Expand Up @@ -46,22 +47,65 @@ def outfile(cellpath, define_data, ftype='', extra='', exists=False):
assert os.path.exists(outpath), "Missing required:"+outpath
return outpath

def patch_netlist_json (infile, outfile):
''' Patches yosys generated netlist json
to workaround netlistsvg compability issues.
Currently covered:
- convert unsupported pin direction 'inout' to 'output'
- convert unsupported High-Z connection ("z") to none ("x")

def write_netlistsvg(cellpath, define_data):
Args:
infile - input file [str of pathlib.Path]
outfile - patched file [str of pathlib.Path]
'''

block_header = '\s*"\w*"\:\s*\{' #eg. "connections": {
unsupported_dir = '\s*"direction":\s*"inout"' #eg. "direction": "input"
unsupported_con = '\s*"\w*":\s*\[\s*"z"\s*\]' #eg. "A": [ "z" ]
json = ''
current_block = None

with open(str(infile),'r') as f:
for line in f:
if re.match (block_header, line):
current_block = line.partition(':')[0].strip(' "\n')
if re.match (unsupported_dir, line):
line = re.sub ( ':\s*"inout"', ': "output"', line)
if current_block =='connections' and re.match (unsupported_con, line):
line = re.sub ( '\[\s*"z"\s*\]', '[ "x" ]' , line, flags=re.IGNORECASE)
json +=line
with open(str(outfile),'w') as f:
f.write(json)


def write_netlistsvg(cellpath, define_data, json_patching = False):
''' Generates netlistsvg for a given cell.

Args:
cellpath - path to a cell [str of pathlib.Path]
define_data - cell definition data [dic]
json_patching - filter netlist for potential netlistsvg compablity issues
'''

netlist_json = os.path.join(cellpath, define_data['file_prefix']+'.json')
if not os.path.exists(netlist_json):
print("No netlist in", cellpath)
assert os.path.exists(netlist_json), netlist_json

if json_patching: #correct netlistsvg parsing issues
netlist_json_fix = os.path.join(cellpath, define_data['file_prefix']+'.patched.json')
patch_netlist_json (netlist_json, netlist_json_fix)
netlist_json = netlist_json_fix

outpath = outfile(cellpath, define_data, 'schematic')
if subprocess.call(['netlistsvg', netlist_json, '-o', outpath]):
raise ChildProcessError("netlistsvg execution failed")
if json_patching:
os.remove(netlist_json_fix)
raise ChildProcessError("netlistsvg execution failed")

if json_patching:
pass
os.remove(netlist_json_fix)

def process(cellpath):
''' Processes cell indicated by path.
Expand All @@ -80,7 +124,11 @@ def process(cellpath):
define_data = json.load(open(define_json))

if define_data['type'] == 'cell':
write_netlistsvg(cellpath, define_data)
try:
write_netlistsvg(cellpath, define_data)
except ChildProcessError:
print ("Netlistsvg error, retrying with json patch...")
write_netlistsvg(cellpath, define_data, json_patching=True)

return

Expand Down