53bb4300a3
Although useful for debugging, most external tools often complain about such attributes (with notable exception of Vivado). As such, it is better to emit Verilog with these attributes into a separate file such as `design.debug.v` and only emit the attributes that were explicitly placed by the user to `design.v`. This still leaves the (*init*) attribute. See #220 for details.
76 lines
2 KiB
Python
76 lines
2 KiB
Python
import os
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import re
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import subprocess
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from .._toolchain import *
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from . import rtlil
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__all__ = ["YosysError", "convert", "convert_fragment"]
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class YosysError(Exception):
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pass
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def _yosys_version():
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yosys_path = require_tool("yosys")
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version = subprocess.check_output([yosys_path, "-V"], encoding="utf-8")
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m = re.match(r"^Yosys ([\d.]+)(?:\+(\d+))?", version)
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tag, offset = m[1], m[2] or 0
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return tuple(map(int, tag.split("."))), offset
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def _convert_rtlil_text(rtlil_text, *, strip_internal_attrs=False):
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version, offset = _yosys_version()
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if version < (0, 9):
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raise YosysError("Yosys %d.%d is not suppored", *version)
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attr_map = []
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if strip_internal_attrs:
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attr_map.append("-remove generator")
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attr_map.append("-remove top")
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attr_map.append("-remove src")
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attr_map.append("-remove nmigen.hierarchy")
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attr_map.append("-remove nmigen.decoding")
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script = """
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# Convert nMigen's RTLIL to readable Verilog.
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read_ilang <<rtlil
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{}
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rtlil
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{prune}proc_prune
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proc_init
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proc_arst
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proc_dff
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proc_clean
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memory_collect
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attrmap {attr_map}
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attrmap -modattr {attr_map}
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write_verilog -norename
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""".format(rtlil_text,
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prune="# " if version == (0, 9) and offset == 0 else "",
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attr_map=" ".join(attr_map),
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)
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popen = subprocess.Popen([require_tool("yosys"), "-q", "-"],
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stdin=subprocess.PIPE,
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stdout=subprocess.PIPE,
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stderr=subprocess.PIPE,
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encoding="utf-8")
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verilog_text, error = popen.communicate(script)
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if popen.returncode:
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raise YosysError(error.strip())
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else:
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return verilog_text
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def convert_fragment(*args, strip_internal_attrs=False, **kwargs):
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rtlil_text, name_map = rtlil.convert_fragment(*args, **kwargs)
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return _convert_rtlil_text(rtlil_text, strip_internal_attrs=strip_internal_attrs), name_map
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def convert(*args, strip_internal_attrs=False, **kwargs):
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rtlil_text = rtlil.convert(*args, **kwargs)
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return _convert_rtlil_text(rtlil_text, strip_internal_attrs=strip_internal_attrs)
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