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Title: [3.9] bpo-43710: Change layout of pystate struct to preserve intra-version ABI compatibiliy. by markshannon · Pull Request #25160 · python/cpython · GitHub

Open Graph Title: [3.9] bpo-43710: Change layout of pystate struct to preserve intra-version ABI compatibiliy. by markshannon · Pull Request #25160 · python/cpython

X Title: [3.9] bpo-43710: Change layout of pystate struct to preserve intra-version ABI compatibiliy. by markshannon · Pull Request #25160 · python/cpython

Description: This PR replaces the original (in 3.9.0) char overflowed; char recursion_critical; with short recursion_headroom; restoring the ABI broken by #24501 Since recursion_headroom, overflowed, and recursion_critical all serve the same purpose, indicating that RecursionError should not be raised unless overflow become excessive, we can safely merge them. I choose to use short recursion_headroom rather than using char recursion_headroom and leaving recursion_critical in place, so that assignments to recursion_critical in code compiled for 3.9.0 will be visible as changes to recursion_headroom. The layout will be the same (at least for all compilers where sizeof(short) == sizeof(char)*2). https://bugs.python.org/issue43710

Open Graph Description: This PR replaces the original (in 3.9.0) char overflowed; char recursion_critical; with short recursion_headroom; restoring the ABI broken by #24501 Since recursion_headroom, overflowe...

X Description: This PR replaces the original (in 3.9.0) char overflowed; char recursion_critical; with short recursion_headroom; restoring the ABI broken by #24501 Since recursion_headroom, overflowe...

Opengraph URL: https://github.com/python/cpython/pull/25160

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[3.9] bpo-43710: Change layout of pystate struct to preserve intra-version ABI compatibiliy. https://github.com/python/cpython/pull/25160/files#top
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7c96405 Change layout of pystate struct to preserve intra-version ABI compati… markshannon Apr 3, 2021 https://github.com/python/cpython/pull/25160/commits/7c964050077e06ef8bad41cc120f7630973c54d6
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