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py: Define and use MP_OBJ_ITER_BUF_NSLOTS to get size of stack iter buf.

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It improves readability of code and reduces the chance to make a mistake.

This patch also fixes a bug with nan-boxing builds by rounding up the
calculation of the new NSLOTS variable, giving the correct number of slots
(being 4) even if mp_obj_t is larger than the native machine size.
This commit is contained in:
Damien George
2017-03-23 16:36:08 +11:00
parent 507119f4d8
commit 60656eaea4
5 changed files with 24 additions and 18 deletions
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4
py/obj.h
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@@ -422,6 +422,10 @@ typedef struct _mp_obj_iter_buf_t {
mp_obj_t buf[3];
} mp_obj_iter_buf_t;
// The number of slots that an mp_obj_iter_buf_t needs on the Python value stack.
// It's rounded up in case mp_obj_base_t is smaller than mp_obj_t (eg for OBJ_REPR_D).
#define MP_OBJ_ITER_BUF_NSLOTS ((sizeof(mp_obj_iter_buf_t) + sizeof(mp_obj_t) - 1) / sizeof(mp_obj_t))
typedef void (*mp_print_fun_t)(const mp_print_t *print, mp_obj_t o, mp_print_kind_t kind);
typedef mp_obj_t (*mp_make_new_fun_t)(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *args);
typedef mp_obj_t (*mp_call_fun_t)(mp_obj_t fun, size_t n_args, size_t n_kw, const mp_obj_t *args);