forked from M-Labs/artiq
transforms: track units, now() returns seconds, implement time_to_cycles and cycles_to_time
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1a64e92e75
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e22301ea05
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@ -48,7 +48,7 @@ class Core:
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self, k_function, k_args, k_kwargs)
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_debug_unparse("inline", func_def)
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lower_units(func_def, self.runtime_env.ref_period)
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lower_units(func_def, rpc_map)
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_debug_unparse("lower_units", func_def)
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fold_constants(func_def)
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@ -60,7 +60,9 @@ class Core:
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interleave(func_def)
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_debug_unparse("interleave", func_def)
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lower_time(func_def, getattr(self.runtime_env, "initial_time", 0))
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lower_time(func_def,
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getattr(self.runtime_env, "initial_time", 0),
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self.runtime_env.ref_period)
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_debug_unparse("lower_time", func_def)
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fold_constants(func_def)
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@ -34,12 +34,12 @@ class DDS(AutoContext):
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"""
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if self.previous_frequency != frequency:
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if self.sw.previous_timestamp != now():
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if self.sw.previous_timestamp != time_to_cycles(now()):
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self.sw.sync()
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if self.sw.previous_value:
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# Channel is already on.
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# Precise timing of frequency change is required.
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fud_time = now()
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fud_time = time_to_cycles(now())
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else:
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# Channel is off.
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# Use soft timing on FUD to prevent conflicts when
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@ -6,7 +6,7 @@ class _RTIOBase(AutoContext):
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parameters = "channel"
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def build(self):
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self.previous_timestamp = int64(0)
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self.previous_timestamp = int64(0) # in RTIO cycles
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self.previous_value = 0
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kernel_attr = "previous_timestamp previous_value"
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@ -17,14 +17,16 @@ class _RTIOBase(AutoContext):
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@kernel
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def _set_value(self, value):
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if now() < self.previous_timestamp:
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if time_to_cycles(now()) < self.previous_timestamp:
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raise RTIOSequenceError
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if self.previous_value != value:
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if self.previous_timestamp == now():
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syscall("rtio_replace", now(), self.channel, value)
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if self.previous_timestamp == time_to_cycles(now()):
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syscall("rtio_replace", time_to_cycles(now()),
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self.channel, value)
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else:
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syscall("rtio_set", now(), self.channel, value)
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self.previous_timestamp = now()
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syscall("rtio_set", time_to_cycles(now()),
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self.channel, value)
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self.previous_timestamp = time_to_cycles(now())
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self.previous_value = value
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@ -4,20 +4,51 @@ from artiq.transforms.tools import value_to_ast
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from artiq.language.core import int64
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def _insert_int64(node):
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def _time_to_cycles(ref_period, node):
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divided = ast.copy_location(
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ast.BinOp(left=node,
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op=ast.Div(),
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right=value_to_ast(ref_period)),
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node)
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return ast.copy_location(
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ast.Call(func=ast.Name("int64", ast.Load()),
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args=[node],
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args=[divided],
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keywords=[], starargs=[], kwargs=[]),
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divided)
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def _cycles_to_time(ref_period, node):
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return ast.copy_location(
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ast.BinOp(left=node,
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op=ast.Mult(),
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right=value_to_ast(ref_period)),
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node)
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class _TimeLowerer(ast.NodeTransformer):
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def __init__(self, ref_period):
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self.ref_period = ref_period
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def visit_Call(self, node):
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if isinstance(node.func, ast.Name) and node.func.id == "now":
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# optimize time_to_cycles(now()) -> now
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if (isinstance(node.func, ast.Name)
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and node.func.id == "time_to_cycles"
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and isinstance(node.args[0], ast.Call)
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and isinstance(node.args[0].func, ast.Name)
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and node.args[0].func.id == "now"):
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return ast.copy_location(ast.Name("now", ast.Load()), node)
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else:
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self.generic_visit(node)
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if isinstance(node.func, ast.Name):
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funcname = node.func.id
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if funcname == "now":
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return _cycles_to_time(
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self.ref_period,
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ast.copy_location(ast.Name("now", ast.Load()), node))
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elif funcname == "time_to_cycles":
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return _time_to_cycles(self.ref_period, node)
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elif funcname == "cycles_to_time":
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return _cycles_to_time(self.ref_period, node)
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return node
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def visit_Expr(self, node):
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@ -29,12 +60,14 @@ class _TimeLowerer(ast.NodeTransformer):
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return ast.copy_location(
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ast.AugAssign(target=ast.Name("now", ast.Store()),
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op=ast.Add(),
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value=_insert_int64(node.value.args[0])),
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value=_time_to_cycles(self.ref_period,
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node.value.args[0])),
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node)
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elif funcname == "at":
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return ast.copy_location(
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ast.Assign(targets=[ast.Name("now", ast.Store())],
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value=_insert_int64(node.value.args[0])),
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value=_time_to_cycles(self.ref_period,
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node.value.args[0])),
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node)
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else:
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return node
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@ -42,8 +75,8 @@ class _TimeLowerer(ast.NodeTransformer):
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return node
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def lower_time(func_def, initial_time):
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_TimeLowerer().visit(func_def)
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def lower_time(func_def, initial_time, ref_period):
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_TimeLowerer(ref_period).visit(func_def)
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func_def.body.insert(0, ast.copy_location(
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ast.Assign(targets=[ast.Name("now", ast.Store())],
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value=value_to_ast(int64(initial_time))),
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@ -1,40 +1,108 @@
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import ast
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from artiq.transforms.tools import value_to_ast
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from artiq.language import units
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# TODO:
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# * track variable and expression dimensions
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# * raise exception on dimension errors in expressions
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# * modify RPC map to reintroduce units
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# * handle core time conversion outside of delay/at,
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# e.g. foo = now() + 1*us [...] at(foo)
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def _add_units(f, unit_list):
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def wrapper(*args):
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new_args = [arg if unit is None else units.Quantity(arg, unit)
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for arg, unit in zip(args, unit_list)]
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return f(*new_args)
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return wrapper
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class _UnitsLowerer(ast.NodeTransformer):
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def __init__(self, ref_period):
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self.ref_period = ref_period
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self.in_core_time = False
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def __init__(self, rpc_map):
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self.rpc_map = rpc_map
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self.variable_units = dict()
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def visit_Name(self, node):
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try:
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unit = self.variable_units[node.id]
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except KeyError:
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pass
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else:
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if unit is not None:
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node.unit = unit
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return node
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def visit_UnaryOp(self, node):
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self.generic_visit(node)
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if hasattr(node.operand, "unit"):
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node.unit = node.operand.unit
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return node
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def visit_BinOp(self, node):
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self.generic_visit(node)
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op = type(node.op)
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left_unit = getattr(node.left, "unit", None)
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right_unit = getattr(node.right, "unit", None)
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if op in (ast.Add, ast.Sub, ast.Mod):
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unit = units.addsub_dimension(left_unit, right_unit)
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elif op == ast.Mult:
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unit = units.mul_dimension(left_unit, right_unit)
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elif op in (ast.Div, ast.FloorDiv):
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unit = units.div_dimension(left_unit, right_unit)
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else:
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unit = None
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if unit is not None:
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node.unit = unit
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return node
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def visit_Attribute(self, node):
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self.generic_visit(node)
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if node.attr == "amount" and hasattr(node.value, "unit"):
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del node.value.unit
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return node.value
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else:
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return node
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def visit_Call(self, node):
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fn = node.func.id
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if fn in ("delay", "at"):
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old_in_core_time = self.in_core_time
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self.in_core_time = True
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self.generic_visit(node)
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self.in_core_time = old_in_core_time
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elif fn == "Quantity":
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if self.in_core_time:
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node = ast.copy_location(
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ast.BinOp(left=node.args[0],
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op=ast.Div(),
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right=value_to_ast(self.ref_period)),
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node)
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else:
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node = node.args[0]
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if node.func.id == "Quantity":
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amount, unit = node.args
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amount.unit = unit.s
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return amount
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elif node.func.id == "now":
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node.unit = "s"
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elif node.func.id == "syscall" and node.args[0].s == "rpc":
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unit_list = [getattr(arg, "unit", None) for arg in node.args]
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rpc_n = node.args[1].n
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self.rpc_map[rpc_n] = _add_units(self.rpc_map[rpc_n], unit_list)
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return node
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def _update_target(self, target, unit):
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if isinstance(target, ast.Name):
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if target.id in self.variable_units:
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if self.variable_units[target.id] != unit:
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raise TypeError(
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"Inconsistent units for variable '{}': '{}' and '{}'"
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.format(target.id,
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self.variable_units[target.id],
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unit))
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else:
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self.variable_units[target.id] = unit
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def visit_Assign(self, node):
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node.value = self.visit(node.value)
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unit = getattr(node.value, "unit", None)
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for target in node.targets:
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self._update_target(target, unit)
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return node
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def visit_AugAssign(self, node):
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value = self.visit_BinOp(ast.BinOp(
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op=node.op, left=node.target, right=node.value))
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unit = getattr(value, "unit", None)
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self._update_target(node.target, unit)
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return node
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# Only dimensionless iterators are supported
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def visit_For(self, node):
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self.generic_visit(node)
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self._update_target(node.target, None)
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return node
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def lower_units(func_def, ref_period):
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_UnitsLowerer(ref_period).visit(func_def)
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def lower_units(func_def, rpc_map):
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_UnitsLowerer(rpc_map).visit(func_def)
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