[generator] Close all open generators in compile_subgraph #156880
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This was referenced Jun 25, 2025
StopIteration with value from return stmt
guilhermeleobas
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Jun 26, 2025
**Motivation and Example** Explictly close all open generators in compile_subgraph to ensure that all remaining finally blocks are executed. In CPython this is done by invoking the `tp_finalize` function of the generator object, which triggers `genclose`: https://github.com/python/cpython/blob/58a42dea97f4fa0df38ef4a95a2ede65e0549f71/Objects/genobject.c#L128-L134 ```python import gc def whoo(t): nonlocal z z = 0 try: z += 1 yield t.sin() except ValueError: z += 10 yield t.cos() except RuntimeError: z += 100 yield t.tan() finally: z += 1000 z += 10_000 gen = whoo(t) a = next(gen) b = gen.throw(RuntimeError) gc.collect() print(z) # 1101 ``` ghstack-source-id: e1abab6 Pull-Request: #156880
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Stack from ghstack (oldest at bottom):
contextlib.suppress#147990Motivation and Example
Explictly close all open generators in compile_subgraph to ensure that
all remaining finally blocks are executed. In CPython this is done by
invoking the
tp_finalizefunction of the generator object, which triggersgenclose:https://github.com/python/cpython/blob/58a42dea97f4fa0df38ef4a95a2ede65e0549f71/Objects/genobject.c#L128-L134