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GH-114456: lower the recursion limit under WASI for debug builds (GH-114457)

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Testing under wasmtime 16.0.0 w/ code from https://github.com/python/cpython/issues/114413 is how the value was found.
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Brett Cannon 2024-01-23 15:48:14 -08:00 • committed by GitHub
parent afe8f376c0
commit f59f90b5bc
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4 changed files with 13 additions and 6 deletions
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11
Include/cpython/pystate.h
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@ -217,11 +217,14 @@ struct _ts {
#ifdef Py_DEBUG
// A debug build is likely built with low optimization level which implies
// higher stack memory usage than a release build: use a lower limit.
# define Py_C_RECURSION_LIMIT 500
# if defined(__wasi__)
// Based on wasmtime 16.
# define Py_C_RECURSION_LIMIT 150
# else
# define Py_C_RECURSION_LIMIT 500
# endif
#elif defined(__wasi__)
// WASI has limited call stack. Python's recursion limit depends on code
// layout, optimization, and WASI runtime. Wasmtime can handle about 700
// recursions, sometimes less. 500 is a more conservative limit.
// Based on wasmtime 16.
# define Py_C_RECURSION_LIMIT 500
#elif defined(__s390x__)
# define Py_C_RECURSION_LIMIT 800