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py/obj: Add functions to retrieve large integers from mp_obj_t.

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This commit provides helpers to retrieve integer values from
mp_obj_t when the content does not fit in a 32 bits integer,
without risking an implicit wrap due to an int overflow.

Signed-off-by: Yoctopuce dev <dev@yoctopuce.com>
This commit is contained in:
Yoctopuce dev
2025-06-30 23:28:20 +02:00
committed by Damien George
parent 49159ef6b7
commit c4a88f2ce7
6 changed files with 102 additions and 0 deletions
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16
py/objint_longlong.c
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@@ -295,6 +295,22 @@ mp_int_t mp_obj_int_get_checked(mp_const_obj_t self_in) {
return mp_obj_int_get_truncated(self_in);
}
mp_uint_t mp_obj_int_get_uint_checked(mp_const_obj_t self_in) {
if (mp_obj_is_small_int(self_in)) {
if (MP_OBJ_SMALL_INT_VALUE(self_in) >= 0) {
return MP_OBJ_SMALL_INT_VALUE(self_in);
}
} else {
const mp_obj_int_t *self = self_in;
long long value = self->val;
mp_uint_t truncated = (mp_uint_t)value;
if (value >= 0 && (long long)truncated == value) {
return truncated;
}
}
mp_raise_msg(&mp_type_OverflowError, MP_ERROR_TEXT("overflow converting long int to machine word"));
}
#if MICROPY_PY_BUILTINS_FLOAT
mp_float_t mp_obj_int_as_float_impl(mp_obj_t self_in) {
assert(mp_obj_is_exact_type(self_in, &mp_type_int));