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py/objtype: Fit qstrs for special methods in byte type.

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Update makeqstrdata.py to sort strings starting with "__" to the beginning
of qstr list, so they get low qstr id's, guaranteedly fitting in 8 bits.
Then use this property to further compact op_id => qstr mapping arrays.
This commit is contained in:
Paul Sokolovsky 2017-10-21 11:06:32 +03:00
parent f2baa9ec24
commit 9956fd0710
3 changed files with 18 additions and 6 deletions
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10
py/makeqstrdata.py
View File

@ -108,7 +108,15 @@ def parse_input_headers(infiles):
continue
# add the qstr to the list, with order number to retain original order in file
qstrs[ident] = (len(qstrs), ident, qstr)
order = len(qstrs)
# but put special method names like __add__ at the top of list, so
# that their id's fit into a byte
if ident == "":
# Sort empty qstr above all still
order = -200000
elif ident.startswith("__"):
order -= 100000
qstrs[ident] = (order, ident, qstr)
if not qcfgs:
sys.stderr.write("ERROR: Empty preprocessor output - check for errors above\n")

10
py/objtype.c
View File

@ -332,7 +332,9 @@ mp_obj_t mp_obj_instance_make_new(const mp_obj_type_t *self, size_t n_args, size
return MP_OBJ_FROM_PTR(o);
}
const uint16_t mp_unary_op_method_name[MP_UNARY_OP_NUM_RUNTIME] = {
// Qstrs for special methods are guaranteed to have a small value, so we use byte
// type to represent them.
const byte mp_unary_op_method_name[MP_UNARY_OP_NUM_RUNTIME] = {
[MP_UNARY_OP_BOOL] = MP_QSTR___bool__,
[MP_UNARY_OP_LEN] = MP_QSTR___len__,
[MP_UNARY_OP_HASH] = MP_QSTR___hash__,
@ -406,9 +408,11 @@ STATIC mp_obj_t instance_unary_op(mp_unary_op_t op, mp_obj_t self_in) {
}
// Binary-op enum values not listed here will have the default value of 0 in the
// table, corresponding to MP_QSTR_, and are therefore unsupported (a lookup will
// table, corresponding to MP_QSTR_NULL, and are therefore unsupported (a lookup will
// fail). They can be added at the expense of code size for the qstr.
const uint16_t mp_binary_op_method_name[MP_BINARY_OP_NUM_RUNTIME] = {
// Qstrs for special methods are guaranteed to have a small value, so we use byte
// type to represent them.
const byte mp_binary_op_method_name[MP_BINARY_OP_NUM_RUNTIME] = {
[MP_BINARY_OP_LESS] = MP_QSTR___lt__,
[MP_BINARY_OP_MORE] = MP_QSTR___gt__,
[MP_BINARY_OP_EQUAL] = MP_QSTR___eq__,

4
py/runtime.h
View File

@ -57,8 +57,8 @@ typedef struct _mp_arg_t {
} mp_arg_t;
// Tables mapping operator enums to qstrs, defined in objtype.c
extern const uint16_t mp_unary_op_method_name[];
extern const uint16_t mp_binary_op_method_name[];
extern const byte mp_unary_op_method_name[];
extern const byte mp_binary_op_method_name[];
void mp_init(void);
void mp_deinit(void);