diff options
Diffstat (limited to 'py/mpconfig.h')
| -rw-r--r-- | py/mpconfig.h | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/py/mpconfig.h b/py/mpconfig.h index 01956f63f7..1f01b3de55 100644 --- a/py/mpconfig.h +++ b/py/mpconfig.h @@ -76,6 +76,19 @@ #define MICROPY_OBJ_REPR_C (2) +// A MicroPython object is a 64-bit word having the following form (called R): +// - seeeeeee eeeeffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff 64-bit fp, e != 0x7ff +// - s1111111 11110000 00000000 00000000 00000000 00000000 00000000 00000000 +/- inf +// - 01111111 11111000 00000000 00000000 00000000 00000000 00000000 00000000 normalised nan +// - 01111111 11111101 00000000 00000000 iiiiiiii iiiiiiii iiiiiiii iiiiiii1 small int +// - 01111111 11111110 00000000 00000000 qqqqqqqq qqqqqqqq qqqqqqqq qqqqqqq1 str +// - 01111111 11111100 00000000 00000000 pppppppp pppppppp pppppppp pppppp00 ptr (4 byte alignment) +// Stored as O = R + 0x8004000000000000, retrieved as R = O - 0x8004000000000000. +// This makes pointers have all zeros in the top 32 bits. +// Small-ints and strs have 1 as LSB to make sure they don't look like pointers +// to the garbage collector. +#define MICROPY_OBJ_REPR_D (3) + #ifndef MICROPY_OBJ_REPR #define MICROPY_OBJ_REPR (MICROPY_OBJ_REPR_A) #endif |