torch-mlir/python/npcomp/compiler/name_resolver_base.py

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# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
# See https://llvm.org/LICENSE.txt for license information.
# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
"""Name resolvers for common scenarios."""
from typing import Optional
from _npcomp.mlir import ir
from .interfaces import *
__all__ = [
"ConstModuleNameResolver",
"LocalNameResolver",
]
################################################################################
# Local name resolution
# This is used for local names that can be managed purely as SSA values.
################################################################################
class LocalNameReference(NameReference):
"""Holds an association between a name and SSA value."""
__slots__ = [
"_current_value",
]
def __init__(self, name, initial_value=None):
super().__init__(name)
self._current_value = initial_value
def load(self, env: Environment) -> PartialEvalResult:
if self._current_value is None:
return PartialEvalResult.error_message(
"Attempt to access local '{}' before assignment".format(self.name))
return PartialEvalResult.yields_ir_value(self._current_value)
def store(self, env: Environment, value: ir.Value):
self._current_value = value
def __repr__(self):
return "<LocalNameReference({})>".format(self.name)
class LocalNameResolver(NameResolver):
"""Resolves names in a local cache of SSA values.
This is used to manage locals and arguments (that are not referenced through
a closure).
"""
__slots__ = [
"_name_refs",
]
def __init__(self, names):
super().__init__()
self._name_refs = {name: LocalNameReference(name) for name in names}
def resolve_name(self, name) -> Optional[NameReference]:
return self._name_refs.get(name)
################################################################################
# Constant name resolution
# For some DSLs, it can be appropriate to treat some containing scopes as
# constants. This strategy typically binds to a module and routes loads
# through the partial evaluation hook.
################################################################################
class ConstNameReference(NameReference):
"""Represents a name/value mapping that will emit as a constant."""
__slots__ = [
"_py_value",
]
def __init__(self, name, py_value):
super().__init__(name)
self._py_value = py_value
def load(self, env: Environment) -> PartialEvalResult:
return env.partial_evaluate(self._py_value)
def __repr__(self):
return "<ConstNameReference({}={})>".format(self.name, self._py_value)
class ConstModuleNameResolver(NameResolver):
"""Resolves names from a module by treating them as immutable and loading
them as constants into a function scope.
"""
__slots__ = [
"_as_dict",
"module",
]
def __init__(self, module, *, as_dict=False):
super().__init__()
self.module = module
self._as_dict = as_dict
def resolve_name(self, name) -> Optional[NameReference]:
if self._as_dict:
if name in self.module:
py_value = self.module[name]
else:
return None
else:
try:
py_value = getattr(self.module, name)
except AttributeError:
return None
return ConstNameReference(name, py_value)