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https://github.com/The-OpenROAD-Project/OpenLane.git
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46d8e5a042
~ Avoid using `/dev/null` for writing DEF files (it tries to create a temp file and fail) ~ PDK now has a default value of sky130A even outside the Makefile ~ PDK_ROOT now set automatically if Volare is installed ~ Upgrade to a newer version of OpenLane 2, which in turns uses `nix-eda` ~ Format nix packages using Alejandra ~ OpenROAD scripts now read liberty files before database files (they are linked together when the database is read) ~ Update Readme to remove Colab and add banner directing people to OpenLane 2
133 lines
4.7 KiB
Python
Executable File
133 lines
4.7 KiB
Python
Executable File
#!/usr/bin/python3
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# Copyright 2020 Efabless Corporation
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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# ---------------------------------------------------------
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# LVS failure check
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#
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# This is a Python script that parses the comp.json
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# output from netgen and reports on the number of
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# errors in the top-level netlist.
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#
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# ---------------------------------------------------------
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# Written by Tim Edwards
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# efabless, inc.
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# Pulled from qflow GUI as standalone script Aug 20, 2018
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# ---------------------------------------------------------
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import re
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import json
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import argparse
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def count_LVS_failures(filename):
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with open(filename, "r") as cfile:
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lvsdata = json.load(cfile)
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# Count errors in the JSON file
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failures = 0
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devfail = 0
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netfail = 0
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pinfail = 0
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propfail = 0
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netdiff = 0
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devdiff = 0
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ncells = len(lvsdata)
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for c in range(0, ncells):
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cellrec = lvsdata[c]
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if c == ncells - 1:
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topcell = True
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else:
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topcell = False
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# Most errors must only be counted for the top cell, because individual
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# failing cells are flattened and the matching attempted again on the
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# flattened netlist.
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if topcell:
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if "devices" in cellrec:
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devices = cellrec["devices"]
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devlist = [val for pair in zip(devices[0], devices[1]) for val in pair]
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devpair = list(devlist[p : p + 2] for p in range(0, len(devlist), 2))
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for dev in devpair:
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c1dev = dev[0]
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c2dev = dev[1]
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diffdevs = abs(c1dev[1] - c2dev[1])
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failures += diffdevs
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devdiff += diffdevs
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if "nets" in cellrec:
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nets = cellrec["nets"]
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diffnets = abs(nets[0] - nets[1])
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failures += diffnets
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netdiff += diffnets
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if "badnets" in cellrec:
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badnets = cellrec["badnets"]
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failures += len(badnets)
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netfail += len(badnets)
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if "badelements" in cellrec:
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badelements = cellrec["badelements"]
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failures += len(badelements)
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devfail += len(badelements)
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if "pins" in cellrec:
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pins = cellrec["pins"]
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pinlist = [val for pair in zip(pins[0], pins[1]) for val in pair]
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pinpair = list(pinlist[p : p + 2] for p in range(0, len(pinlist), 2))
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for pin in pinpair:
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# Avoid flagging global vs. local names, e.g., "gnd" vs. "gnd!,"
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# and ignore case when comparing pins.
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pin0 = re.sub("!$", "", pin[0].lower())
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pin1 = re.sub("!$", "", pin[1].lower())
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if pin0 != pin1:
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# The text "(no pin)" indicates a missing pin that can be
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# ignored because the pin in the other netlist is a no-connect
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if pin0 != "(no pin)" and pin1 != "(no pin)":
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failures += 1
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pinfail += 1
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# Property errors must be counted for every cell
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if "properties" in cellrec:
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properties = cellrec["properties"]
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failures += len(properties)
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propfail += len(properties)
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return [failures, netfail, devfail, pinfail, propfail, netdiff, devdiff]
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if __name__ == "__main__":
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parser = argparse.ArgumentParser(description="Parses netgen lvs")
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parser.add_argument("--file", "-f", required=True)
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args = parser.parse_args()
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failures = count_LVS_failures(args.file)
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total = failures[0]
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if total > 0:
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failed = True
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print("LVS reports:")
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print(" net count difference = " + str(failures[5]))
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print(" device count difference = " + str(failures[6]))
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print(" unmatched nets = " + str(failures[1]))
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print(" unmatched devices = " + str(failures[2]))
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print(" unmatched pins = " + str(failures[3]))
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print(" property failures = " + str(failures[4]))
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else:
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print("LVS reports no net, device, pin, or property mismatches.")
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print("")
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print("Total errors = " + str(total))
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