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registry.py
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registry.py
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from collections import OrderedDict
from itertools import product
from devito.archinfo import Platform
from devito.exceptions import InvalidOperator
from devito.tools import Singleton
__all__ = ['operator_registry', 'operator_selector']
class OperatorRegistry(OrderedDict, metaclass=Singleton):
"""
A registry for Operators:
(platform, mode, language) -> operator
where:
* `platform` is an object of type Platform, that is the architecture
the code is generated for.
* `mode` is the optimization level (e.g., `advanced`).
* `language` is the target language for shared-memory parallelism
(e.g., 'C', 'openmp').
* `operator` is an object of type Operator.
"""
_modes = ('noop', 'advanced', 'advanced-fsg')
_languages = ('C', 'openmp', 'openacc')
_accepted = _modes + tuple(product(_modes, _languages))
def add(self, operator, platform, mode, language='C'):
assert issubclass(platform, Platform)
assert mode in OperatorRegistry._modes or mode == 'custom'
self[(platform, mode, language)] = operator
def fetch(self, platform=None, mode=None, language='C', **kwargs):
"""
Retrieve an Operator for the given `<platform, mode, language>`.
"""
if mode not in OperatorRegistry._modes:
# Optimization given as an arbitrary sequence of passes
mode = 'custom'
if language not in OperatorRegistry._languages:
raise ValueError("Unknown language `%s`" % language)
for cls in platform._mro():
for (p, m, l), kls in self.items():
if issubclass(p, cls) and m == mode and l == language:
return kls
raise InvalidOperator("Cannot compile an Operator for `%s`"
% str((platform, mode, language)))
operator_registry = OperatorRegistry()
"""To be populated by the individual backends."""
operator_selector = operator_registry.fetch