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py/runtime: Allow multiple *args in a function call.

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This is a partial implementation of PEP 448 to allow unpacking multiple
star args in a function or method call.

This is implemented by changing the emitted bytecodes so that both
positional args and star args are stored as positional args.  A bitmap is
added to indicate if an argument at a given position is a positional
argument or a star arg.

In the generated code, this new bitmap takes the place of the old star arg.
It is stored as a small int, so this means only the first N arguments can
be star args where N is the number of bits in a small int.

The runtime is modified to interpret this new bytecode format while still
trying to perform as few memory reallocations as possible.

Signed-off-by: David Lechner <david@pybricks.com>
This commit is contained in:
David Lechner
2020-03-24 23:54:45 -05:00
committed by Damien George
parent 1e99d29f36
commit 783b1a868f
10 changed files with 151 additions and 69 deletions
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docs/differences/python_35.rst
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@@ -8,7 +8,7 @@ Below is a list of finalised/accepted PEPs for Python 3.5 grouped into their imp
+----------------------------------------------------------------------------------------------------------+---------------+
| **Extensions to the syntax:** | **Status** |
+--------------------------------------------------------+-------------------------------------------------+---------------+
| `PEP 448 <https://www.python.org/dev/peps/pep-0448/>`_ | additional unpacking generalizations | |
| `PEP 448 <https://www.python.org/dev/peps/pep-0448/>`_ | additional unpacking generalizations | Partial |
+--------------------------------------------------------+-------------------------------------------------+---------------+
| `PEP 465 <https://www.python.org/dev/peps/pep-0465/>`_ | a new matrix multiplication operator | Completed |
+--------------------------------------------------------+-------------------------------------------------+---------------+