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GH-130397: use __stack_high and __stack_low LLVM WASM attributes #131855

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GH-130397: use __stack_high and __stack_low LLVM WASM attributes #131855

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12 changes: 12 additions & 0 deletions Python/ceval.c
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Original file line number Diff line number Diff line change
Expand Up @@ -429,6 +429,10 @@ int pthread_attr_destroy(pthread_attr_t *a)

#endif

#if defined(__wasi__) & _Py__has_attribute(weak)
extern __attribute__((weak)) unsigned char __stack_high;
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This should be size_t, not char right?

extern __attribute__((weak)) unsigned char __stack_low;
#endif

void
_Py_InitializeRecursionLimits(PyThreadState *tstate)
Expand Down Expand Up @@ -469,6 +473,14 @@ _Py_InitializeRecursionLimits(PyThreadState *tstate)
return;
}
# endif
#if defined(__wasi__) & _Py__has_attribute(weak)
if (__stack_high) {
_tstate->c_stack_top = &__stack_high;
_tstate->c_stack_soft_limit = &__stack_low + PYOS_STACK_MARGIN_BYTES * 2;
_tstate->c_stack_hard_limit = &__stack_low + PYOS_STACK_MARGIN_BYTES;
return;
}
#endif
_tstate->c_stack_top = _Py_SIZE_ROUND_UP(here_addr, 4096);
_tstate->c_stack_soft_limit = _tstate->c_stack_top - Py_C_STACK_SIZE;
_tstate->c_stack_hard_limit = _tstate->c_stack_top - (Py_C_STACK_SIZE + PYOS_STACK_MARGIN_BYTES);
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