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

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>

tests/ports/unix/extra_coverage.py

@@ -6,6 +6,16 @@ except NameError:
 
 import errno
 import io
+import uctypes
+
+# create an int-like variable used for coverage of `mp_obj_get_ll`
+buf = bytearray(b"\xde\xad\xbe\xef")
+struct = uctypes.struct(
+    uctypes.addressof(buf),
+    {"f32": uctypes.UINT32 | 0},
+    uctypes.BIG_ENDIAN,
+)
+deadbeef = struct.f32
 
 data = extra_coverage()
 

tests/ports/unix/extra_coverage.py.exp

@@ -94,6 +94,12 @@ data
 1
 0
 0.000000
+deadbeef
+c0ffee777c0ffee
+deadbeef
+0deadbeef
+c0ffee
+000c0ffee
 # runtime utils
 TypeError: unsupported type for __abs__: 'str'
 TypeError: unsupported types for __divmod__: 'str', 'str'
@@ -102,6 +108,8 @@ TypeError: unsupported types for __divmod__: 'str', 'str'
 2
 OverflowError: overflow converting long int to machine word
 OverflowError: overflow converting long int to machine word
+TypeError: can't convert NoneType to int
+TypeError: can't convert NoneType to int
 ValueError: 
 Warning: test
 # format float