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generate_opcode_metadata.py
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81 lines (60 loc) · 2.24 KB
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"""
Generate Lib/_opcode_metadata.py for RustPython bytecode.
This file generates opcode metadata that is compatible with CPython 3.13.
"""
import itertools
import pathlib
import re
import typing
ROOT = pathlib.Path(__file__).parents[1]
BYTECODE_FILE = (
ROOT / "crates" / "compiler-core" / "src" / "bytecode" / "instruction.rs"
)
OPCODE_METADATA_FILE = ROOT / "Lib" / "_opcode_metadata.py"
class Opcode(typing.NamedTuple):
rust_name: str
id: int
@property
def cpython_name(self) -> str:
name = re.sub(r"(?<=[a-z0-9])([A-Z])", r"_\1", self.rust_name)
return re.sub(r"(\D)(\d+)$", r"\1_\2", name).upper()
@classmethod
def from_str(cls, body: str):
raw_variants = re.split(r"(\d+),", body.strip())
raw_variants.remove("")
for raw_name, raw_id in itertools.batched(raw_variants, 2):
name = re.findall(r"\b[A-Z][A-Za-z]*\d*\b(?=\s*[\({=])", raw_name)[0]
yield cls(rust_name=name.strip(), id=int(raw_id))
def __lt__(self, other: typing.Self) -> bool:
return self.id < other.id
def extract_enum_body(contents: str, enum_name: str) -> str:
res = re.search(f"pub enum {enum_name} " + r"\{(.+?)\n\}", contents, re.DOTALL)
if not res:
raise ValueError(f"Could not find {enum_name} enum")
return "\n".join(
line.split("//")[0].strip() # Remove any comment. i.e. "foo // some comment"
for line in res.group(1).splitlines()
if not line.strip().startswith("//") # Ignore comment lines
)
contents = BYTECODE_FILE.read_text(encoding="utf-8")
enum_body = "\n".join(
extract_enum_body(contents, enum_name)
for enum_name in ("Instruction", "PseudoInstruction")
)
opcodes = list(Opcode.from_str(enum_body))
# Generate the output file
output = """# This file is generated by scripts/generate_opcode_metadata.py
# for RustPython bytecode format (CPython 3.13 compatible opcode numbers).
# Do not edit!
_specializations = {}
_specialized_opmap = {}
opmap = {
"""
for opcode in sorted(opcodes):
output += f" '{opcode.cpython_name}': {opcode.id},\n"
output += """}
# CPython 3.13 compatible: opcodes < 44 have no argument
HAVE_ARGUMENT = 44
MIN_INSTRUMENTED_OPCODE = 236
"""
OPCODE_METADATA_FILE.write_text(output, encoding="utf-8")