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tools/mpy-tool.py: Intern more strings when freezing.

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Signed-off-by: Damien George <damien@micropython.org>
This commit is contained in:
Damien George 2022-04-08 14:09:08 +10:00
parent 40d431d1bb
commit 07f526067e
1 changed files with 8 additions and 0 deletions
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8
tools/mpy-tool.py
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@ -62,6 +62,11 @@ import struct
sys.path.append(sys.path[0] + "/../py")
import makeqstrdata as qstrutil
# Threshold of str length below which it will be turned into a qstr when freezing.
# This helps to reduce frozen code size because qstrs are more efficient to encode
# as objects than full mp_obj_str_t instances.
PERSISTENT_STR_INTERN_THRESHOLD = 25
class MPYReadError(Exception):
def __init__(self, filename, msg):
@ -1187,6 +1192,9 @@ def read_obj(reader, segments):
reader.read_byte() # read and discard null terminator
if obj_type == MP_PERSISTENT_OBJ_STR:
obj = str_cons(buf, "utf8")
if len(obj) < PERSISTENT_STR_INTERN_THRESHOLD:
if not global_qstrs.find_by_str(obj):
global_qstrs.add(obj)
elif obj_type == MP_PERSISTENT_OBJ_BYTES:
obj = buf
elif obj_type == MP_PERSISTENT_OBJ_INT: