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Throw an exception if the user tries to render a trace without stepping the simulation #472

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Throw an exception if the user tries to render a trace without stepping the simulation #472

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2 changes: 2 additions & 0 deletions pyrtl/simulation.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1756,6 +1756,8 @@ def render_trace(
is not found in the map, the argument ``repr_func`` will be used instead.
:param segment_size: Traces are broken in the segments of this number of cycles.
"""
if len(self) == 0:
raise PyrtlError("You need to step the simulation at least once to render a trace.")
if repr_per_name is None:
repr_per_name = {}
if _currently_in_jupyter_notebook():
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