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Fix infinite loops in global scope #65

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merged 1 commit into from
Jun 21, 2024
Merged

Fix infinite loops in global scope #65

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12 changes: 12 additions & 0 deletions src/pynguin/analyses/controlflow.py
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Original file line number Diff line number Diff line change
Expand Up @@ -543,6 +543,16 @@ def _create_graph(
assert successor_node
cfg.add_edge(predecessor_node, successor_node, **attrs)

@staticmethod
def _infinite_loop_nodes(cfg: CFG) -> set[ProgramGraphNode]:
nodes: set[ProgramGraphNode] = set()
exit_nodes = cfg.exit_nodes
for node in cfg.nodes:
successors = cfg.get_successors(node)
if node in successors and successors.isdisjoint(exit_nodes):
nodes.add(node)
return nodes

@staticmethod
def _insert_dummy_entry_node(cfg: CFG) -> CFG:
dummy_entry_node = ProgramGraphNode(index=-1, is_artificial=True)
Expand All @@ -567,6 +577,8 @@ def _insert_dummy_exit_node(cfg: CFG) -> CFG:
cfg.add_node(dummy_exit_node)
for exit_node in exit_nodes:
cfg.add_edge(exit_node, dummy_exit_node)
for infinite_loop_node in CFG._infinite_loop_nodes(cfg):
cfg.add_edge(infinite_loop_node, dummy_exit_node)
return cfg

@property
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