Class _Block

Tools/jit/_optimizers.py:132–152

@dataclasses.dataclass(eq=False)
class _Block:
    label: str | None = None
    # Non-instruction lines like labels, directives, and comments:
    noninstructions: list[str] = dataclasses.field(default_factory=list)
    # Instruction lines:
    instructions: list[Instruction] = dataclasses.field(default_factory=list)
    # If this block ends in a jump, where to?
    target: typing.Self | None = None
    # The next block in the linked list:
    link: typing.Self | None = None
    # Whether control flow can fall through to the linked block above:
    fallthrough: bool = True
    # Whether this block can eventually reach the next uop (_JIT_CONTINUE):
    hot: bool = False

    def resolve(self) -> typing.Self:
        """Find the first non-empty block reachable from this one."""
        block = self
        while block.link and not block.instructions:
            block = block.link
        return block


@dataclasses.dataclass