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