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py: Clean up some logic in VM to remove assert(0)'s.

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Saves around 30 bytes code on Thumb2 archs.
This commit is contained in:
Damien George 2015-03-25 22:20:37 +00:00
parent aedf583af2
commit 5e1d993f54
1 changed files with 17 additions and 26 deletions
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43
py/vm.c
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@ -566,25 +566,20 @@ dispatch_loop:
SET_TOP(mp_const_none);
mp_call_function_n_kw(obj, 3, 0, no_exc);
} else if (MP_OBJ_IS_SMALL_INT(TOP())) {
mp_obj_t cause = TOP();
switch (MP_OBJ_SMALL_INT_VALUE(cause)) {
case UNWIND_RETURN:
mp_call_function_n_kw(sp[-2], 3, 0, no_exc);
break;
case UNWIND_JUMP:
with_cleanup_no_other_choice:
mp_call_function_n_kw(sp[-3], 3, 0, no_exc);
// Pop __exit__ boundmethod at sp[-3]
sp[-3] = sp[-2];
break;
default:
assert(0);
goto with_cleanup_no_other_choice; // to help flow control analysis
mp_int_t cause_val = MP_OBJ_SMALL_INT_VALUE(TOP());
if (cause_val == UNWIND_RETURN) {
mp_call_function_n_kw(sp[-2], 3, 0, no_exc);
} else {
assert(cause_val == UNWIND_JUMP);
mp_call_function_n_kw(sp[-3], 3, 0, no_exc);
// Pop __exit__ boundmethod at sp[-3]
sp[-3] = sp[-2];
}
sp[-2] = sp[-1]; // copy retval down
sp[-1] = sp[0]; // copy cause down
sp--; // discard top value (was cause)
} else if (mp_obj_is_exception_type(TOP())) {
} else {
assert(mp_obj_is_exception_type(TOP()));
// Need to pass (sp[0], sp[-1], sp[-2]) as arguments so must reverse the
// order of these on the value stack (don't want to create a temporary
// array because it increases stack footprint of the VM).
@ -612,8 +607,6 @@ dispatch_loop:
sp[-1] = obj;
sp--;
}
} else {
assert(0);
}
DISPATCH();
}
@ -672,19 +665,17 @@ unwind_jump:;
}
if (TOP() == mp_const_none) {
sp--;
} else if (MP_OBJ_IS_SMALL_INT(TOP())) {
} else {
assert(MP_OBJ_IS_SMALL_INT(TOP()));
// We finished "finally" coroutine and now dispatch back
// to our caller, based on TOS value
mp_unwind_reason_t reason = MP_OBJ_SMALL_INT_VALUE(POP());
switch (reason) {
case UNWIND_RETURN:
goto unwind_return;
case UNWIND_JUMP:
goto unwind_jump;
if (reason == UNWIND_RETURN) {
goto unwind_return;
} else {
assert(reason == UNWIND_JUMP);
goto unwind_jump;
}
assert(0);
} else {
assert(0);
}
DISPATCH();