def visit_Slice(self, node):
if not isinstance(node.value, Signal):
slice_proxy = Signal(value_bits_sign(node.value))
if self.target_context:
a = _Assign(node.value, slice_proxy)
else:
a = _Assign(slice_proxy, node.value)
self.comb.append(self.visit_Assign(a))
node = _Slice(slice_proxy, node.start, node.stop)
return NodeTransformer.visit_Slice(self, node)
def visit_Slice(self, node):
if not isinstance(node.value, Signal):
slice_proxy = Signal(value_bits_sign(node.value))
if self.target_context:
a = _Assign(node.value, slice_proxy)
else:
a = _Assign(slice_proxy, node.value)
self.comb.append(self.visit_Assign(a))
node = _Slice(slice_proxy, node.start, node.stop)
return NodeTransformer.visit_Slice(self, node)
def visit_expr_call(self, node):
if isinstance(node.func, ast.Name):
callee = self.symdict[node.func.id]
else:
raise NotImplementedError
if callee == transel.bitslice:
if len(node.args) != 2 and len(node.args) != 3:
raise TypeError("bitslice() takes 2 or 3 arguments")
val = self.visit_expr(node.args[0])
low = eval_ast(node.args[1], self.symdict)
if len(node.args) == 3:
up = eval_ast(node.args[2], self.symdict)
else:
up = low + 1
return _Slice(val, low, up)
else:
raise NotImplementedError
def visit_expr_call(self, node):
if isinstance(node.func, ast.Name):
callee = self.symdict[node.func.id]
else:
raise NotImplementedError
if callee == transel.bitslice:
if len(node.args) != 2 and len(node.args) != 3:
raise TypeError("bitslice() takes 2 or 3 arguments")
val = self.visit_expr(node.args[0])
low = eval_ast(node.args[1], self.symdict)
if len(node.args) == 3:
up = eval_ast(node.args[2], self.symdict)
else:
up = low + 1
return _Slice(val, low, up)
else:
raise NotImplementedError
def visit_Slice(self, node):
return _Slice(self.visit(node.value), node.start, node.stop)
