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bpo-33041: Rework compiling an "async for" loop. (#6142)

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* Added new opcode END_ASYNC_FOR.
* Setting global StopAsyncIteration no longer breaks "async for" loops.
* Jumping into an "async for" loop is now disabled.
* Jumping out of an "async for" loop no longer corrupts the stack.
* Simplify the compiler.
This commit is contained in:
Serhiy Storchaka 2018-03-23 14:34:35 +02:00 • committed by GitHub
parent c65bf3fe4a
commit 702f8f3611
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14 changed files with 276 additions and 226 deletions
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Lib/importlib/_bootstrap_external.py
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@ -247,6 +247,7 @@ _code_type = type(_write_atomic.__code__)
# Python 3.7a4 3392 (PEP 552: Deterministic pycs #31650)
# Python 3.7b1 3393 (remove STORE_ANNOTATION opcode #32550)
# Python 3.8a1 3400 (move frame block handling to compiler #17611)
# Python 3.8a1 3401 (add END_ASYNC_FOR #33041)
#
# MAGIC must change whenever the bytecode emitted by the compiler may no
# longer be understood by older implementations of the eval loop (usually
@ -255,7 +256,7 @@ _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 = (3400).to_bytes(2, 'little') + b'\r\n'
MAGIC_NUMBER = (3401).to_bytes(2, 'little') + b'\r\n'
_RAW_MAGIC_NUMBER = int.from_bytes(MAGIC_NUMBER, 'little') # For import.c
_PYCACHE = '__pycache__'