from __future__ import annotations

from mypyc.ir.ops import ComparisonOp, GetElementPtr, Integer, LoadMem, Value
from mypyc.ir.rtypes import PyVarObject, c_pyssize_t_rprimitive, object_rprimitive
from mypyc.irbuild.ll_builder import LowLevelIRBuilder
from mypyc.lower.registry import lower_primitive_op


@lower_primitive_op("var_object_size")
def var_object_size(builder: LowLevelIRBuilder, args: list[Value], line: int) -> Value:
    elem_address = builder.add(GetElementPtr(args[0], PyVarObject, "ob_size"))
    return builder.add(LoadMem(c_pyssize_t_rprimitive, elem_address))


@lower_primitive_op("propagate_if_error")
def propagate_if_error_op(builder: LowLevelIRBuilder, args: list[Value], line: int) -> Value:
    # Return False on NULL. The primitive uses ERR_FALSE, so this is an error.
    return builder.add(ComparisonOp(args[0], Integer(0, object_rprimitive), ComparisonOp.NEQ))