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Issue #23722: Initialize __class__ from type.__new__()

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The __class__ cell used by zero-argument super() is now initialized
from type.__new__ rather than __build_class__, so class methods
relying on that will now work correctly when called from metaclass
methods during class creation.

Patch by Martin Teichmann.
This commit is contained in:
Nick Coghlan 2016-09-11 14:45:49 +10:00
parent fc3f7d5677
commit 944368e1cc
8 changed files with 1358 additions and 1258 deletions
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5
Lib/importlib/_bootstrap_external.py
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@ -236,7 +236,8 @@ _code_type = type(_write_atomic.__code__)
# Python 3.6b1 3373 (add BUILD_STRING opcode #27078)
# Python 3.6b1 3375 (add SETUP_ANNOTATIONS and STORE_ANNOTATION opcodes
# #27985)
# Python 3.6a1 3376 (simplify CALL_FUNCTIONs & BUILD_MAP_UNPACK_WITH_CALL)
# Python 3.6b1 3376 (simplify CALL_FUNCTIONs & BUILD_MAP_UNPACK_WITH_CALL)
# Python 3.6b1 3377 (set __class__ cell from type.__new__ #23722)
#
# MAGIC must change whenever the bytecode emitted by the compiler may no
# longer be understood by older implementations of the eval loop (usually
@ -245,7 +246,7 @@ _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 = (3376).to_bytes(2, 'little') + b'\r\n'
MAGIC_NUMBER = (3377).to_bytes(2, 'little') + b'\r\n'
_RAW_MAGIC_NUMBER = int.from_bytes(MAGIC_NUMBER, 'little') # For import.c
_PYCACHE = '__pycache__'