123 lines
4.2 KiB
Python
123 lines
4.2 KiB
Python
from enum import Enum
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from collections import OrderedDict
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from .. import tracer
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from ..tools import union
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from .ast import *
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__all__ = ["Direction", "DIR_NONE", "DIR_FANOUT", "DIR_FANIN", "Layout", "Record"]
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Direction = Enum('Direction', ('NONE', 'FANOUT', 'FANIN'))
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DIR_NONE = Direction.NONE
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DIR_FANOUT = Direction.FANOUT
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DIR_FANIN = Direction.FANIN
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class Layout:
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@staticmethod
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def wrap(obj):
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if isinstance(obj, Layout):
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return obj
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return Layout(obj)
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def __init__(self, fields):
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self.fields = OrderedDict()
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for field in fields:
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if not isinstance(field, tuple) or len(field) not in (2, 3):
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raise TypeError("Field {!r} has invalid layout: should be either "
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"(name, shape) or (name, shape, direction)"
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.format(field))
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if len(field) == 2:
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name, shape = field
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direction = DIR_NONE
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if isinstance(shape, list):
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shape = Layout.wrap(shape)
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else:
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name, shape, direction = field
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if not isinstance(direction, Direction):
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raise TypeError("Field {!r} has invalid direction: should be a Direction "
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"instance like DIR_FANIN"
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.format(field))
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if not isinstance(name, str):
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raise TypeError("Field {!r} has invalid name: should be a string"
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.format(field))
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if not isinstance(shape, (int, tuple, Layout)):
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raise TypeError("Field {!r} has invalid shape: should be an int, tuple, or list "
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"of fields of a nested record"
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.format(field))
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if name in self.fields:
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raise NameError("Field {!r} has a name that is already present in the layout"
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.format(field))
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self.fields[name] = (shape, direction)
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def __getitem__(self, name):
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return self.fields[name]
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def __iter__(self):
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for name, (shape, dir) in self.fields.items():
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yield (name, shape, dir)
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class Record(Value):
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__slots__ = ("fields",)
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def __init__(self, layout, name=None):
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if name is None:
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try:
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name = tracer.get_var_name()
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except tracer.NameNotFound:
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pass
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self.name = name
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self.src_loc = tracer.get_src_loc()
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def concat(a, b):
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if a is None:
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return b
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return "{}_{}".format(a, b)
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self.layout = Layout.wrap(layout)
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self.fields = OrderedDict()
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for field_name, field_shape, field_dir in self.layout:
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if isinstance(field_shape, Layout):
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self.fields[field_name] = Record(field_shape, name=concat(name, field_name))
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else:
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self.fields[field_name] = Signal(field_shape, name=concat(name, field_name))
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def __getattr__(self, name):
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return self[name]
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def __getitem__(self, name):
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try:
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return self.fields[name]
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except KeyError:
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if self.name is None:
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reference = "Unnamed record"
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else:
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reference = "Record '{}'".format(self.name)
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raise NameError("{} does not have a field '{}'. Did you mean one of: {}?"
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.format(reference, name, ", ".join(self.fields))) from None
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def shape(self):
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return sum(len(f) for f in self.fields.values()), False
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def _lhs_signals(self):
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return union((f._lhs_signals() for f in self.fields.values()), start=SignalSet())
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def _rhs_signals(self):
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return union((f._rhs_signals() for f in self.fields.values()), start=SignalSet())
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def __repr__(self):
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fields = []
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for field_name, field in self.fields.items():
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if isinstance(field, Signal):
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fields.append(field_name)
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else:
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fields.append(repr(field))
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name = self.name
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if name is None:
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name = "<unnamed>"
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return "(rec {} {})".format(name, " ".join(fields))
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