mirror of https://github.com/python/cpython
55 lines
1.4 KiB
Python
55 lines
1.4 KiB
Python
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"""Generate targets for computed goto dispatch
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Reads the instruction definitions from bytecodes.c.
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Writes the table to opcode_targets.h by default.
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"""
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import argparse
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from analyzer import (
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Analysis,
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analyze_files,
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)
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from generators_common import (
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DEFAULT_INPUT,
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ROOT,
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)
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from cwriter import CWriter
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from typing import TextIO
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DEFAULT_OUTPUT = ROOT / "Python/opcode_targets.h"
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def write_opcode_targets(analysis: Analysis, out: CWriter) -> None:
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"""Write header file that defines the jump target table"""
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targets = ["&&_unknown_opcode,\n"] * 256
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for name, op in analysis.opmap.items():
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if op < 256:
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targets[op] = f"&&TARGET_{name},\n"
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out.emit("static void *opcode_targets[256] = {\n")
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for target in targets:
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out.emit(target)
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out.emit("};\n")
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arg_parser = argparse.ArgumentParser(
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description="Generate the file with dispatch targets.",
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formatter_class=argparse.ArgumentDefaultsHelpFormatter,
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)
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arg_parser.add_argument(
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"-o", "--output", type=str, help="Generated code", default=DEFAULT_OUTPUT
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)
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arg_parser.add_argument(
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"input", nargs=argparse.REMAINDER, help="Instruction definition file(s)"
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)
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if __name__ == "__main__":
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args = arg_parser.parse_args()
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if len(args.input) == 0:
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args.input.append(DEFAULT_INPUT)
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data = analyze_files(args.input)
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with open(args.output, "w") as outfile:
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out = CWriter(outfile, 0, False)
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write_opcode_targets(data, out)
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