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191 | @dataclass(frozen=True)
class RegisterType(ParametrizedAttribute, TypeAttribute, ABC):
"""
An abstract register type for target ISA-specific dialects.
"""
index: IntAttr | NoneAttr
register_name: StringAttr
@classmethod
def unallocated(cls) -> Self:
"""
Returns an unallocated register of this type.
"""
return cls(NoneAttr(), StringAttr(""))
@classmethod
def _parameters_from_name(
cls, register_name: StringAttr
) -> tuple[IntAttr | NoneAttr, StringAttr]:
"""
Returns the parameter list required to construct a register instance from the given register_name.
"""
if not register_name.data:
return NoneAttr(), register_name
index = cls.index_by_name().get(register_name.data)
if index is None:
# Try to decode as infinite register
prefix = cls.infinite_register_prefix()
if register_name.data.startswith(prefix):
suffix = register_name.data[len(prefix) :]
# infinite registers go from -1 to -inf
try:
index = ~int(suffix)
except ValueError:
index = None
else:
index = None
# Raise verification error instead
index_attr = NoneAttr() if index is None else IntAttr(index)
return index_attr, register_name
@classmethod
def from_name(cls, register_name: StringAttr | str) -> Self:
if not isinstance(register_name, StringAttr):
register_name = StringAttr(register_name)
return cls(*cls._parameters_from_name(register_name))
@classmethod
def from_index(cls, index: int) -> Self:
if index < 0:
return cls.infinite_register(~index)
name = cls.abi_name_by_index()[index]
return cls(IntAttr(index), StringAttr(name))
@property
def is_allocated(self) -> bool:
"""Returns true if the register is allocated, otherwise false"""
return bool(self.register_name.data)
@classmethod
def parse_parameters(cls, parser: AttrParser) -> Sequence[Attribute]:
if parser.parse_optional_punctuation("<"):
name = parser.parse_identifier()
parser.parse_punctuation(">")
params = cls._parameters_from_name(StringAttr(name))
else:
params = (NoneAttr(), StringAttr(""))
return params
def print_parameters(self, printer: Printer) -> None:
if self.register_name.data:
with printer.in_angle_brackets():
printer.print_string(self.register_name.data)
def verify(self) -> None:
name = self.register_name.data
expected_index = type(self).index_by_name().get(name)
if isinstance(self.index, NoneAttr):
if not name:
# Unallocated, expect NoneAttr
return
if expected_index is None:
raise VerifyException(
f"Invalid register name {name} for register type {self.name}."
)
else:
raise VerifyException(
f"Missing index for register {name}, expected {expected_index}."
)
if not name:
raise VerifyException(
f"Invalid index {self.index.data} for unallocated register."
)
if expected_index is not None:
# Normal registers
if expected_index == self.index.data:
return
raise VerifyException(
f"Invalid index {self.index.data} for register {name}, expected {expected_index}."
)
infinite_register_name = self.infinite_register_prefix() + str(~self.index.data)
if name == infinite_register_name:
return
raise VerifyException(f"Invalid index {self.index.data} for register {name}.")
@classmethod
def allocatable_registers(cls) -> Sequence[Self]:
"""
Registers of this type that can be used for register allocation.
"""
return ()
@classmethod
@abstractmethod
def index_by_name(cls) -> dict[str, int]:
raise NotImplementedError()
# This class variable is created and exclusively accessed in `abi_name_by_index`.
# _ABI_NAME_BY_INDEX: ClassVar[dict[int, str]]
@classmethod
def abi_name_by_index(cls) -> dict[int, str]:
"""
Returns a mapping from ABI register indices to their names.
"""
if hasattr(cls, "_ABI_NAME_BY_INDEX"):
return cls._ABI_NAME_BY_INDEX
result = {i: n for n, i in cls.index_by_name().items()}
cls._ABI_NAME_BY_INDEX = result
return result
@classmethod
@abstractmethod
def infinite_register_prefix(cls) -> str:
"""
Provide the prefix for the name for a register at the given index in the
"infinite" register set.
For a prefix `x`, the name of the first infinite register will be `x0`.
"""
raise NotImplementedError()
@classmethod
def infinite_register(cls, index: int) -> Self:
"""
Provide the register at the given index in the "infinite" register set.
Index must be positive.
"""
assert index >= 0, f"Infinite index must be positive, got {index}."
register_name = cls.infinite_register_prefix() + str(index)
assert register_name not in cls.index_by_name(), (
f"Invalid 'infinite' register name: {register_name} clashes with finite register set"
)
index_attr = IntAttr(~index)
res = cls(index_attr, StringAttr(register_name))
return res
|