[New-bugs-announce] [issue33334] Add support of NOP and EXTENDED_ARG in stack_effect()

Serhiy Storchaka report at bugs.python.org
Sun Apr 22 13:11:17 EDT 2018

New submission from Serhiy Storchaka <storchaka+cpython at gmail.com>:

Currently dis.stack_effect() doesn't support opcodes NOP and EXTENDED_ARG. NOP is never emitted by the standard compiler (it is temporary added in the peephole optimizer, but later it is removed). EXTENDED_ARG is a special case, it is considered as a part of long instructions.

dis.stack_effect() itself is not used in the dis module. It can be used in the third-party code, and the third-party code can produce bytecode with non-standard use of NOP and EXTENDED_ARG. Supporting them in dis.stack_effect() can avoid the need of special casing them in the third-party code.

I don't know whether this is a bug fix or a new feature.

components: Library (Lib)
messages: 315622
nosy: larry, serhiy.storchaka
priority: normal
severity: normal
status: open
title: Add support of NOP and EXTENDED_ARG in stack_effect()
versions: Python 3.8

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