| # ------------------------------------------------------------------------------- |
| # replace.py |
| # |
| # Replacing DFUndefined and None with DFTerminal |
| # |
| # Copyright (C) 2013, Shinya Takamaeda-Yamazaki |
| # License: Apache 2.0 |
| # ------------------------------------------------------------------------------- |
| from __future__ import absolute_import |
| from __future__ import print_function |
| import sys |
| import os |
| |
| from pyverilog.dataflow.dataflow import * |
| |
| |
| def replaceUndefined(tree, termname): |
| if tree is None: |
| return DFTerminal(termname) |
| if isinstance(tree, DFUndefined): |
| return DFTerminal(termname) |
| # if isinstance(tree, DFHighImpedance): return DFTerminal(termname) |
| if isinstance(tree, DFConstant): |
| return tree |
| if isinstance(tree, DFEvalValue): |
| return tree |
| if isinstance(tree, DFTerminal): |
| return tree |
| if isinstance(tree, DFBranch): |
| condnode = replaceUndefined(tree.condnode, termname) |
| truenode = replaceUndefined(tree.truenode, termname) |
| falsenode = replaceUndefined(tree.falsenode, termname) |
| return DFBranch(condnode, truenode, falsenode) |
| if isinstance(tree, DFOperator): |
| nextnodes = [] |
| for n in tree.nextnodes: |
| nextnodes.append(replaceUndefined(n, termname)) |
| return DFOperator(tuple(nextnodes), tree.operator) |
| if isinstance(tree, DFPartselect): |
| msb = replaceUndefined(tree.msb, termname) |
| lsb = replaceUndefined(tree.lsb, termname) |
| var = replaceUndefined(tree.var, termname) |
| return DFPartselect(var, msb, lsb) |
| if isinstance(tree, DFPointer): |
| ptr = replaceUndefined(tree.ptr, termname) |
| var = replaceUndefined(tree.var, termname) |
| return DFPointer(var, ptr) |
| if isinstance(tree, DFConcat): |
| nextnodes = [] |
| for n in tree.nextnodes: |
| nextnodes.append(replaceUndefined(n, termname)) |
| return DFConcat(tuple(nextnodes)) |
| raise DefinitionError('Undefined DFNode type: %s %s' % (str(type(tree)), str(tree))) |
