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py: Revert mp_load_attr() to its previous state (not supporting default val). 

Based on the discussion in #433. mp_load_attr() is critical-path function,
so any extra check will slowdown any script. As supporting default val
required only for getattr() builtin, move correspending implementation
there (still as a separate function due to concerns of maintainability
of such almost-duplicated code instances).
This commit is contained in:
Paul Sokolovsky 2014-04-06 02:12:03 +03:00
parent 4e1ed82583
commit 36dd19ae27
3 changed files with 20 additions and 11 deletions
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16
py/builtin.c
View File

@ -400,6 +400,22 @@ STATIC mp_obj_t mp_builtin_id(mp_obj_t o_in) {
MP_DEFINE_CONST_FUN_OBJ_1(mp_builtin_id_obj, mp_builtin_id);
// See mp_load_attr() if making any changes
STATIC inline mp_obj_t mp_load_attr_default(mp_obj_t base, qstr attr, mp_obj_t defval) {
mp_obj_t dest[2];
// use load_method, raising or not raising exception
((defval == MP_OBJ_NULL) ? mp_load_method : mp_load_method_maybe)(base, attr, dest);
if (dest[0] == MP_OBJ_NULL) {
return defval;
} else if (dest[1] == MP_OBJ_NULL) {
// load_method returned just a normal attribute
return dest[0];
} else {
// load_method returned a method, so build a bound method object
return mp_obj_new_bound_meth(dest[0], dest[1]);
}
}
STATIC mp_obj_t mp_builtin_getattr(uint n_args, const mp_obj_t *args) {
assert(MP_OBJ_IS_QSTR(args[1]));
mp_obj_t defval = MP_OBJ_NULL;

14
py/runtime.c
View File

@ -672,14 +672,12 @@ too_long:
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError, "too many values to unpack (expected %d)", num));
}
mp_obj_t mp_load_attr_default(mp_obj_t base, qstr attr, mp_obj_t defval) {
mp_obj_t mp_load_attr(mp_obj_t base, qstr attr) {
DEBUG_OP_printf("load attr %p.%s\n", base, qstr_str(attr));
// use load_method
mp_obj_t dest[2];
// use load_method, raising or not raising exception
((defval == MP_OBJ_NULL) ? mp_load_method : mp_load_method_maybe)(base, attr, dest);
if (dest[0] == MP_OBJ_NULL) {
return defval;
} else if (dest[1] == MP_OBJ_NULL) {
mp_load_method(base, attr, dest);
if (dest[1] == MP_OBJ_NULL) {
// load_method returned just a normal attribute
return dest[0];
} else {
@ -688,10 +686,6 @@ mp_obj_t mp_load_attr_default(mp_obj_t base, qstr attr, mp_obj_t defval) {
}
}
mp_obj_t mp_load_attr(mp_obj_t base, qstr attr) {
return mp_load_attr_default(base, attr, MP_OBJ_NULL);
}
// no attribute found, returns: dest[0] == MP_OBJ_NULL, dest[1] == MP_OBJ_NULL
// normal attribute found, returns: dest[0] == <attribute>, dest[1] == MP_OBJ_NULL
// method attribute found, returns: dest[0] == <method>, dest[1] == <self>

1
py/runtime.h
View File

@ -45,7 +45,6 @@ mp_obj_t mp_call_method_n_kw_var(bool have_self, uint n_args_n_kw, const mp_obj_
void mp_unpack_sequence(mp_obj_t seq, uint num, mp_obj_t *items);
mp_obj_t mp_store_map(mp_obj_t map, mp_obj_t key, mp_obj_t value);
mp_obj_t mp_load_attr(mp_obj_t base, qstr attr);
mp_obj_t mp_load_attr_default(mp_obj_t base, qstr attr, mp_obj_t defval);
void mp_load_method(mp_obj_t base, qstr attr, mp_obj_t *dest);
void mp_load_method_maybe(mp_obj_t base, qstr attr, mp_obj_t *dest);
void mp_store_attr(mp_obj_t base, qstr attr, mp_obj_t val);