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