[issue33387] Simplify bytecodes for try-finally, try-except and with blocks.
Mark Shannon
report at bugs.python.org
Sun Apr 29 14:30:40 EDT 2018
Mark Shannon <mark at hotpy.org> added the comment:
The six complex bytecodes currently used for implementing 'with' and 'try' statements can be replaced with just two simpler bytecodes.
The six bytecodes are WITH_CLEANUP_START, WITH_CLEANUP_FINISH,
BEGIN_FINALLY, END_FINALLY, CALL_FINALLY and POP_FINALLY.
They can be replaced with RERAISE and WITH_EXCEPT_FINISH.
See https://bugs.python.org/issue32949 for more details of the new bytecodes and how they are used in the 'with' statement.
The try-finally statement can be implemented broadly as
SETUP_FINALLY except
try-body
POP_BLOCK
finally-body
JUMP exit
except:
finally-body
exit:
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<https://bugs.python.org/issue33387>
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