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shdl2c.py
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shdl2c.py
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#!/usr/bin/env python
import io
import re
import sys
import metadata_output_pb2
indent = " "
wire_type = "uint32_t"
if len(sys.argv) < 5 or len(sys.argv) > 6:
print(f"Usage: {sys.argv[0]} [shdl circuit] [metadata protobuf] [output c source] [output header] [original c source]")
exit(1)
shdl_path = sys.argv[1]
metadata_path = sys.argv[2]
output_c_path = sys.argv[3]
output_h_path = sys.argv[4]
original_c_path = None if len(sys.argv) < 6 else sys.argv[5]
out_fn = io.StringIO()
out_tts = io.StringIO()
signature = io.StringIO()
prologue = io.StringIO()
epilogue = io.StringIO()
additional_headers = io.StringIO()
metadata = metadata_output_pb2.MetadataOutput()
with open(metadata_path, 'rb') as f:
metadata.ParseFromString(f.read())
top_fn_proto = metadata.top_func_proto
return_type = top_fn_proto.return_type
params = top_fn_proto.params
# --- parse additional headers ---
if original_c_path:
with open(original_c_path) as f:
for line in f.readlines():
if line.startswith("#include"):
additional_headers.write(line)
# --- signature generation ---
def proto_type_to_c_type(proto_type):
if proto_type.HasField("as_int"):
return ("" if proto_type.as_int.is_signed else "u") + f"int{proto_type.as_int.width}_t"
if proto_type.HasField("as_inst"):
return f"struct {proto_type.as_inst.name.name}";
if proto_type.HasField("as_array"):
element_type = proto_type_to_c_type(proto_type.as_array.element_type)
return f"{element_type}"
else:
raise RuntimeError(f"proto_type_to_c_type: add support for {proto_type}")
# return type
signature.write(proto_type_to_c_type(return_type))
signature.write(" ")
# fn name
signature.write(top_fn_proto.name.fully_qualified_name)
# parameters
params_c_list = [None] * len(params)
for i, p in enumerate(params):
if p.type.HasField("as_array"):
params_c_list[i] = "const " + proto_type_to_c_type(p.type) + " " + p.name + f"[{p.type.as_array.size}]"
else:
params_c_list[i] = "const " + proto_type_to_c_type(p.type) + " " + p.name
params_c = ", ".join(params_c_list)
signature.write(f"({params_c})")
# --- glue code generation ---
def struct_fields(struct_id):
for struct in metadata.structs:
if struct.as_struct.name.as_inst.name.id == struct_id:
return struct.as_struct.fields
raise RuntimeError(f"struct with id {struct_id} not found")
def unpack_type(first_wire_number, proto_type, name, out):
if proto_type.HasField("as_int"):
for i in range(proto_type.as_int.width):
wire_number = first_wire_number + i
mask = "0b1" + "0" * i
out.write(f"{indent}{wire_type} wire_{wire_number} = ({name} & {mask}) != 0;\n")
return proto_type.as_int.width
if proto_type.HasField("as_inst"):
wire_number = first_wire_number
struct_id = proto_type.as_inst.name.id
for field in reversed(struct_fields(struct_id)):
wire_number += unpack_type(wire_number, field.type, f"{name}.{field.name}", out)
return wire_number - first_wire_number
if proto_type.HasField("as_array"):
element_type = proto_type.as_array.element_type
size = proto_type.as_array.size
wire_number = first_wire_number
for i in range(size):
wire_number += unpack_type(wire_number, element_type, f"{name}[{i}]", out)
return wire_number - first_wire_number
else:
raise RuntimeError(f"unpack_type: add support for {proto_type}")
def pack_type(wire_numbers, first_index_into_wire_numbers, proto_type, name, out, depth=0):
type_name = proto_type_to_c_type(proto_type)
if proto_type.HasField("as_int"):
if depth == 0:
out.write(f"{indent}{type_name} {name} = 0;\n")
for i in range(proto_type.as_int.width):
wire_number = wire_numbers[first_index_into_wire_numbers + i]
out.write(f"{indent}{name} |= (wire_{wire_number} << {i});\n")
return proto_type.as_int.width
if proto_type.HasField("as_inst"):
if depth == 0:
out.write(f"{indent}{type_name} {name} = {{0}};\n")
index_into_wire_numbers = first_index_into_wire_numbers
struct_id = proto_type.as_inst.name.id
for field in reversed(struct_fields(struct_id)):
index_into_wire_numbers += pack_type(wire_numbers, index_into_wire_numbers, field.type, f"{name}.{field.name}", out, depth + 1)
return index_into_wire_numbers - first_index_into_wire_numbers
if proto_type.HasField("as_array"):
if depth == 0:
out.write(f"{indent}{type_name} {name}[{proto_type.as_array.size}] = {{0}};\n");
element_type = proto_type.as_array.element_type
size = proto_type.as_array.size
index_into_wire_numbers = first_index_into_wire_numbers
for i in range(size):
index_into_wire_numbers += pack_type(wire_numbers, index_into_wire_numbers, element_type, f"{name}[{i}]", out, depth + 1)
return index_into_wire_numbers - first_index_into_wire_numbers
else:
raise RuntimeError(f"pack_type: add support for {proto_type}")
# prologue
wire_number = 0
for p in params:
wire_number += unpack_type(wire_number, p.type, p.name, prologue)
with open(shdl_path) as shdl_circuit:
count = 0
for line in shdl_circuit:
elements = re.split(r"\s*[=,()\n\s\[\]]\s*", line)
elements = list(filter(lambda x: x != "", elements))
if "outputs" in elements:
# epilogue
pack_type(list(map(int, elements[1:])), 0, return_type, "result", epilogue)
epilogue.write(f"{indent}return result;\n")
if "gate" in elements:
num_inputs = int(elements[elements.index("arity") + 1])
num_outputs = int(elements.index("gate"))
out_fn.write(f"{indent}struct out{num_outputs}_t out_{count} = ")
out_fn.write(f"lut_{num_inputs}_to_{num_outputs}(")
# parameters
out_fn.write(f"truth_table_{count}, ")
# insert input bits
args = ", ".join([f"wire_{i}" for i in elements[-num_inputs:]])
out_fn.write(args)
out_fn.write(");\n")
# unpack output bits
for i in range(num_outputs):
output_wire_number = int(elements[i])
out_fn.write(f"{indent}{wire_type} wire_{output_wire_number} = out_{count}.o{i};\n")
out_fn.write("\n")
# write truth table
out_tts.write(f"static uint8_t truth_table_{count}[] = {{")
begin_tt_index = elements.index("table") + 1
num_tt_entries = 2 ** num_inputs
tt = [None] * num_outputs
for i in range(num_outputs):
tt[i] = [0] * num_tt_entries
for j in range(num_tt_entries):
tt[i][j] = elements[begin_tt_index + i * num_tt_entries + j]
# https://datagy.io/python-transpose-list-of-lists/
tt = reversed(tt)
transposed_tuples = list(zip(*tt))
transposed_tt = [list(sublist) for sublist in transposed_tuples]
byte_literals = []
for i, tt in enumerate(transposed_tt):
if i % 64 == 0 and i > 0:
byte_literals += ["0"] * (4096 - 64)
joined = "".join(tt).zfill(8)
byte_literal = "0b" + joined
byte_literals.append(byte_literal)
out_tts.write(", ".join(byte_literals))
out_tts.write("};\n")
count += 1
with open(output_c_path, 'w') as f:
f.write(f"#include \"{output_h_path}\"\n");
f.write(f"#include \"luts.h\"\n");
f.write(out_tts.getvalue())
f.write(signature.getvalue())
f.write(" {\n")
f.write(prologue.getvalue())
f.write(out_fn.getvalue())
f.write(epilogue.getvalue())
f.write("}\n")
with open(output_h_path, 'w') as f:
f.write("#include <stdint.h>\n");
f.write(additional_headers.getvalue())
f.write(signature.getvalue())
f.write(";\n")