[3.12] gh-106931: Intern Statically Allocated Strings Globally (gh-107272) (gh-110713)

We tried this before with a dict and for all interned strings.  That ran into problems due to interpreter isolation.  However, exclusively using a per-interpreter cache caused some inconsistency that can eliminate the benefit of interning.  Here we circle back to using a global cache, but only for statically allocated strings.  We also use a more-basic _Py_hashtable_t for that global cache instead of a dict.

Ideally we would only have the global cache, but the optional isolation of each interpreter's allocator means that a non-static string object must not outlive its interpreter.  Thus we would have to store a copy of each such interned string in the global cache, tied to the main interpreter.

(cherry-picked from commit b72947a8d26915156323ccfd04d273199ecb870c)

1 files changed, 1 insertions, 0 deletions

diff --git a/Include/internal/pycore_runtime_init.h b/Include/internal/pycore_runtime_init.h
index 7aace9f..660d7d7 100644
--- a/Include/internal/pycore_runtime_init.h
+++ b/Include/internal/pycore_runtime_init.h
@@ -164,6 +164,7 @@ extern PyTypeObject _PyExc_MemoryError;
             .kind = 1, \
             .compact = 1, \
             .ascii = (ASCII), \
+            .statically_allocated = 1, \
         }, \
     }
 #define _PyASCIIObject_INIT(LITERAL) \