py: Make it so that printing a small int does not allocate heap memory.

With the implementation of proper string formatting, code to print a
small int was delegated to mpz_as_str_inpl (after first converting the
small int to an mpz using stack memory).  But mpz_as_str_inpl allocates
heap memory to do the conversion, so small ints needed heap memory just
to be printed.

This fix has a separate function to print small ints, which does not
allocate heap, and allocates less stack.

String formatting, printf and pfenv are now large beasts, with some
semi-duplicated code.

1 files changed, 8 insertions, 0 deletions

diff --git a/py/objint_longlong.c b/py/objint_longlong.c
index 332f0bbb8..24435415f 100644
--- a/py/objint_longlong.c
+++ b/py/objint_longlong.c
@@ -22,6 +22,14 @@
 #define SUFFIX ""
 #endif
 
+bool mp_obj_int_is_positive(mp_obj_t self_in) {
+    if (MP_OBJ_IS_SMALL_INT(self_in)) {
+        return MP_OBJ_SMALL_INT_VALUE(self_in) >= 0;
+    }
+    mp_obj_int_t *self = self_in;
+    return self->val >= 0;
+}
+
 mp_obj_t mp_obj_int_unary_op(int op, mp_obj_t o_in) {
     mp_obj_int_t *o = o_in;
     switch (op) {