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bpo-43693: Compute deref offsets in compiler (gh-25152)

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Merges locals and cells into a single array.
Saves a pointer in the interpreter and means that we don't need the LOAD_CLOSURE opcode any more

https://bugs.python.org/issue43693
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Mark Shannon 2021-06-04 01:03:54 +01:00 • committed by GitHub
parent 35002aa8f6
commit b2bf2bc1ec
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11 changed files with 222 additions and 209 deletions
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Lib/importlib/_bootstrap_external.py
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@ -356,6 +356,7 @@ _code_type = type(_write_atomic.__code__)
# Python 3.11a1 3451 (Add CALL_METHOD_KW)
# Python 3.11a1 3452 (drop nlocals from marshaled code objects)
# Python 3.11a1 3453 (add co_fastlocalnames and co_fastlocalkinds)
# Python 3.11a1 3454 (compute cell offsets relative to locals bpo-43693)
#
# MAGIC must change whenever the bytecode emitted by the compiler may no
@ -365,7 +366,7 @@ _code_type = type(_write_atomic.__code__)
# Whenever MAGIC_NUMBER is changed, the ranges in the magic_values array
# in PC/launcher.c must also be updated.
MAGIC_NUMBER = (3453).to_bytes(2, 'little') + b'\r\n'
MAGIC_NUMBER = (3454).to_bytes(2, 'little') + b'\r\n'
_RAW_MAGIC_NUMBER = int.from_bytes(MAGIC_NUMBER, 'little') # For import.c
_PYCACHE = '__pycache__'