mirror of
https://github.com/The-OpenROAD-Project/OpenLane.git
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7a65b61b17
+ Added linting rules for flake8, formatting with black + Added a GitHub Action to enforce lint/format rules
138 lines
4.3 KiB
Python
138 lines
4.3 KiB
Python
#!/usr/bin/env 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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import argparse
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import odb
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def remove_buffers(block_design, dont_buffer):
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design_nets = block_design.getNets()
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dont_buffer_nets = [net for net in design_nets if net.getConstName() in dont_buffer]
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for net in dont_buffer_nets:
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# get the cells driving the dont buffer net
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master_cells = get_master_cells(net)
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assert (
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len(master_cells) == 1
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), f"Net {net.getConstName()} is driven by multiple cells."
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cell_name = master_cells[0].getMaster().getConstName()
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assert (
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"buf" in cell_name
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), f"{net.getConstName()} isn't driven by a buffer cell. It is driven by {cell_name}. "
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# get the net connected to the input pin of this buffer
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input_nets, output_nets = get_nets(master_cells[0])
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assert (
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len(output_nets) == 1
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), f"{cell_name} has more than one output port. Please make sure that {cell_name} is a buffer cell."
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assert (
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len(input_nets) == 1
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), f"{cell_name} has more than one input port. Please make sure that {cell_name} is a buffer cell."
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assert (
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output_nets[0].getConstName() in dont_buffer
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), f"{cell_name} isn't driving any of the dont buffer nets."
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# remove the buffer cell instance
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master_cells[0].destroy(master_cells[0])
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# connect buffer cell input net to the dont buffer port
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for input_net in input_nets:
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input_net_master_cell = get_master_cells(input_net)[0]
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_, output_nets_2 = get_nets(input_net_master_cell)
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output_net_it = output_nets_2[0].getITerms()[0]
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output_net_it.connect(net)
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def get_master_cells(net):
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master_cells = []
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for it in net.getITerms():
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master_instance = it.getInst().getMaster()
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master_cells.append(it.getInst())
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cell_type = master_instance.getConstName()
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cell_pin = it.getMTerm().getConstName()
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print(f"Net {net.getConstName()} is connected to {cell_type}, pin {cell_pin}")
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return master_cells
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def get_nets(master_instance):
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input_nets = []
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output_nets = []
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for iterm in master_instance.getITerms():
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if iterm.isSpecial(): # Skip special nets
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continue
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if iterm.isInputSignal():
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input_pin_net = iterm.getNet()
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input_nets.append(input_pin_net)
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if iterm.isOutputSignal():
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output_pin_net = iterm.getNet()
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output_nets.append(output_pin_net)
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return input_nets, output_nets
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def main():
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parser = argparse.ArgumentParser(description="DEF to Liberty.")
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parser.add_argument(
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"--input_lef",
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"-l",
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nargs="+",
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type=str,
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default=None,
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required=True,
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help="Input LEF file(s)",
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)
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parser.add_argument(
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"--input_def", "-i", required=True, help="DEF view of the design."
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)
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parser.add_argument("--output_def", "-o", required=True, help="Output DEF file")
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parser.add_argument(
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"--dont_buffer", "-d", required=True, help="Dont Buffer list of output ports."
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)
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args = parser.parse_args()
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input_lef_files = args.input_lef
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input_def_file = args.input_def
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output_def = args.output_def
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dont_buffer_list = args.dont_buffer
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# parse input def/lef files
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db_design = odb.dbDatabase.create()
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for lef in input_lef_files:
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odb.read_lef(db_design, lef)
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odb.read_def(db_design, input_def_file)
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chip_design = db_design.getChip()
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block_design = chip_design.getBlock()
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# remove buffers connected to the dont buffer nets
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remove_buffers(block_design, dont_buffer_list)
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# write output def
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odb.write_def(block_design, output_def)
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if __name__ == "__main__":
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main()
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