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Make VM stack grow upwards, and so no reversed args arrays.

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Change state layout in VM so the stack starts at state[0] and grows
upwards.  Locals are at the top end of the state and number downwards.
This cleans up a lot of the interface connecting the VM to C: now all
functions that take an array of Micro Python objects are in order (ie no
longer in reverse).

Also clean up C API with keyword arguments (call_n and call_n_kw
replaced with single call method that takes keyword arguments).  And now
make_new takes keyword arguments.

emitnative.c has not yet been changed to comply with the new order of
stack layout.
This commit is contained in:
Damien George
2014-01-18 14:10:48 +00:00
parent 8655065f8c
commit 20006dbba9
28 changed files with 325 additions and 372 deletions
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31
py/objclosure.c
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@@ -16,26 +16,33 @@ typedef struct _mp_obj_closure_t {
mp_obj_t *closed;
} mp_obj_closure_t;
// args are in reverse order in the array
mp_obj_t closure_call_n(mp_obj_t self_in, int n_args, const mp_obj_t *args) {
mp_obj_t closure_call(mp_obj_t self_in, uint n_args, uint n_kw, const mp_obj_t *args) {
mp_obj_closure_t *self = self_in;
// concatenate args and closed-over-vars, in reverse order
// TODO perhaps cache this array so we don't need to create it each time we are called
mp_obj_t *args2 = m_new(mp_obj_t, self->n_closed + n_args);
memcpy(args2, args, n_args * sizeof(mp_obj_t));
for (int i = 0; i < self->n_closed; i++) {
args2[n_args + i] = self->closed[self->n_closed - 1 - i];
}
// need to concatenate closed-over-vars and args
// call the function with the new vars array
return rt_call_function_n(self->fun, n_args + self->n_closed, args2);
int n_total = self->n_closed + n_args + 2 * n_kw;
if (n_total <= 5) {
// use stack to allocate temporary args array
mp_obj_t args2[5];
memcpy(args2, self->closed, self->n_closed * sizeof(mp_obj_t));
memcpy(args2 + self->n_closed, args, (n_args + 2 * n_kw) * sizeof(mp_obj_t));
return rt_call_function_n_kw(self->fun, self->n_closed + n_args, n_kw, args2);
} else {
// use heap to allocate temporary args array
mp_obj_t *args2 = m_new(mp_obj_t, n_total);
memcpy(args2, self->closed, self->n_closed * sizeof(mp_obj_t));
memcpy(args2 + self->n_closed, args, (n_args + 2 * n_kw) * sizeof(mp_obj_t));
mp_obj_t res = rt_call_function_n_kw(self->fun, self->n_closed + n_args, n_kw, args2);
m_del(mp_obj_t, args2, n_total);
return res;
}
}
const mp_obj_type_t closure_type = {
{ &mp_const_type },
"closure",
.call_n = closure_call_n,
.call = closure_call,
};
mp_obj_t mp_obj_new_closure(mp_obj_t fun, mp_obj_t closure_tuple) {