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import pya
except ImportError:
pya = None
import re
import sys
import os
def merge_gds(
pya_mod,
tech_file,
layer_map,
in_def,
design_name,
in_files,
seal_file,
out_file,
allow_empty="",
):
"""Merge DEF and GDS/OAS files into a single stream file.
Args:
pya_mod: The pya module (klayout Python API).
tech_file: Path to klayout technology file.
layer_map: Path to layer map file (empty string if none).
in_def: Path to input DEF file.
design_name: Top-level design name.
in_files: Space-separated string of GDS/OAS files to merge.
seal_file: Path to seal ring GDS/OAS file (empty string if none).
out_file: Path to output GDS/OAS file.
allow_empty: Regex pattern for cells allowed to be empty.
Returns:
Number of errors encountered.
"""
errors = 0
# Load technology file
tech = pya_mod.Technology()
tech.load(tech_file)
layout_options = tech.load_layout_options
if len(layer_map) > 0:
layout_options.lefdef_config.map_file = layer_map
# Load def file
main_layout = pya_mod.Layout()
print("[INFO] Reporting cells prior to loading DEF ...")
for i in main_layout.each_cell():
print("[INFO] '{0}'".format(i.name))
main_layout.read(in_def, layout_options)
# Clear cells
top_cell_index = main_layout.cell(design_name).cell_index()
# remove orphan cell BUT preserve cell with VIA_
# - KLayout is prepending VIA_ when reading DEF that instantiates LEF's via
for i in main_layout.each_cell():
if i.cell_index() != top_cell_index:
if not i.name.startswith("VIA_") and not i.name.endswith("_DEF_FILL"):
i.clear()
# Load in the gds to merge
for fil in in_files.split():
print("\t{0}".format(fil))
main_layout.read(fil)
# Copy the top level only to a new layout
top_only_layout = pya_mod.Layout()
top_only_layout.dbu = main_layout.dbu
top = top_only_layout.create_cell(design_name)
top.copy_tree(main_layout.cell(design_name))
missing_cell = False
regex = re.compile(allow_empty) if allow_empty else None
if allow_empty:
print(f"[INFO] GDS_ALLOW_EMPTY={allow_empty}")
for i in top_only_layout.each_cell():
if i.is_empty():
missing_cell = True
if regex is not None and regex.match(i.name):
print(
"[WARNING] LEF Cell '{0}' ignored. Matches GDS_ALLOW_EMPTY.".format(
i.name
)
)
else:
print(
"[ERROR] LEF Cell '{0}' has no matching GDS/OAS cell."
" Cell will be empty.".format(i.name)
)
errors += 1
if not missing_cell:
print("[INFO] All LEF cells have matching GDS/OAS cells")
orphan_cell = False
for i in top_only_layout.each_cell():
if i.name != design_name and i.parent_cells() == 0:
orphan_cell = True
print("[ERROR] Found orphan cell '{0}'".format(i.name))
errors += 1
if not orphan_cell:
print("[INFO] No orphan cells in the final layout")
if seal_file:
top_cell = top_only_layout.top_cell()
top_only_layout.read(seal_file)
for cell in top_only_layout.top_cells():
if cell != top_cell:
print(
"[INFO] Merging '{0}' as child of '{1}'".format(
cell.name, top_cell.name
)
)
top.insert(pya_mod.CellInstArray(cell.cell_index(), pya_mod.Trans()))
# Write out the GDS
top_only_layout.write(out_file)
return errors
# When run via klayout -r, globals tech_file, layer_map, in_def, etc.
# are set by klayout's -rd mechanism.
if pya is not None:
try:
# These globals are set by klayout -rd flags
sys.exit(
merge_gds(
pya_mod=pya,
tech_file=tech_file, # noqa: F821 - set by klayout -rd
layer_map=layer_map, # noqa: F821
in_def=in_def, # noqa: F821
design_name=design_name, # noqa: F821
in_files=in_files, # noqa: F821
seal_file=seal_file, # noqa: F821
out_file=out_file, # noqa: F821
allow_empty=os.environ.get("GDS_ALLOW_EMPTY", ""),
)
)
except NameError:
# Not running under klayout -r, pya available but no -rd globals
pass
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