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| author | Mark Shannon <mark@hotpy.org> | 2021-11-16 11:01:57 (GMT) |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2021-11-16 11:01:57 (GMT) |
| commit | b9310773756f40f77e075f221a90dd41e6964efc (patch) | |
| tree | 43674ba9f42f2ff81dfd3025956b0ce8e12251f9 /Python/symtable.c | |
| parent | 9bf2cbc4c498812e14f20d86acb61c53928a5a57 (diff) | |
| download | cpython-b9310773756f40f77e075f221a90dd41e6964efc.zip cpython-b9310773756f40f77e075f221a90dd41e6964efc.tar.gz cpython-b9310773756f40f77e075f221a90dd41e6964efc.tar.bz2 | |
bpo-45753: Make recursion checks more efficient. (GH-29524)
* Uses recursion remaining, instead of recursion depth to speed up check against recursion limit.
Diffstat (limited to 'Python/symtable.c')
| -rw-r--r-- | Python/symtable.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/Python/symtable.c b/Python/symtable.c index 64c1635..dc5426c 100644 --- a/Python/symtable.c +++ b/Python/symtable.c @@ -298,8 +298,9 @@ _PySymtable_Build(mod_ty mod, PyObject *filename, PyFutureFeatures *future) return NULL; } /* Be careful here to prevent overflow. */ - starting_recursion_depth = (tstate->recursion_depth < INT_MAX / COMPILER_STACK_FRAME_SCALE) ? - tstate->recursion_depth * COMPILER_STACK_FRAME_SCALE : tstate->recursion_depth; + int recursion_depth = tstate->recursion_limit - tstate->recursion_remaining; + starting_recursion_depth = (recursion_depth < INT_MAX / COMPILER_STACK_FRAME_SCALE) ? + recursion_depth * COMPILER_STACK_FRAME_SCALE : recursion_depth; st->recursion_depth = starting_recursion_depth; st->recursion_limit = (recursion_limit < INT_MAX / COMPILER_STACK_FRAME_SCALE) ? recursion_limit * COMPILER_STACK_FRAME_SCALE : recursion_limit; |