Class DecRef

mypyc/ir/ops.py:602–627

Decrease reference count and free object if zero (dec_ref src). The is_xdec flag says to use an XDECREF, which checks if the pointer is NULL first.

@final
class DecRef(RegisterOp):
    """Decrease reference count and free object if zero (dec_ref src).

    The is_xdec flag says to use an XDECREF, which checks if the
    pointer is NULL first.
    """

    error_kind = ERR_NEVER

    def __init__(self, src: Value, is_xdec: bool = False, line: int = -1) -> None:
        assert src.type.is_refcounted
        super().__init__(line)
        self.src = src
        self.is_xdec = is_xdec

    def __repr__(self) -> str:
        return "<{}DecRef {!r}>".format("X" if self.is_xdec else "", self.src)

    def sources(self) -> list[Value]:
        return [self.src]

    def set_sources(self, new: list[Value]) -> None:
        (self.src,) = new

    def accept(self, visitor: OpVisitor[T]) -> T:
        return visitor.visit_dec_ref(self)


@final