[generator] Close all open generators in compile_subgraph #157149
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This was referenced Jun 27, 2025
guilhermeleobas
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**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 ghstack-source-id: 45df03f Pull Request resolved: #157149
guilhermeleobas
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Jun 27, 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: c4e4678 Pull-Request: #156880 ghstack-source-id: c4e4678 Pull Request resolved: #157149
guilhermeleobas
added a commit
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Jun 27, 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: c4e4678 Pull-Request: #156880 ghstack-source-id: c4e4678 Pull Request resolved: #157149
guilhermeleobas
added a commit
that referenced
this pull request
Jun 27, 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: c4e4678 Pull-Request: #156880 ghstack-source-id: c4e4678 Pull Request resolved: #157149
guilhermeleobas
added a commit
that referenced
this pull request
Jun 27, 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: c4e4678 Pull-Request: #156880 ghstack-source-id: c4e4678 Pull Request resolved: #157149
zou3519
reviewed
Jul 1, 2025
zou3519
reviewed
Jul 1, 2025
| @@ -1397,6 +1397,7 @@ def compile_subgraph( | |||
| overridden_sources=overridden_sources, | |||
| ) | |||
| self.codegen_suffix(tx, stack_values_flat, pass1) | |||
| self.side_effects.close_local_generators() | |||
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add a comment about why this is here.
also TODO(rzou): is this actually the right place?
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Stack from ghstack (oldest at bottom):
StopIteration(value)with value from the return stmt #157152contextlib.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
cc @voznesenskym @penguinwu @EikanWang @jgong5 @Guobing-Chen @XiaobingSuper @zhuhaozhe @blzheng @wenzhe-nrv @jiayisunx @chenyang78 @kadeng @chauhang @amjames