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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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12
tests/basics/fun_callstar.py
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@@ -3,10 +3,16 @@
def foo(a, b, c):
print(a, b, c)
foo(*(), 1, 2, 3)
foo(*(1,), 2, 3)
foo(*(1, 2), 3)
foo(*(1, 2, 3))
foo(1, *(2, 3))
foo(1, 2, *(3,))
foo(1, 2, 3, *())
foo(*(1,), 2, *(3,))
foo(*(1, 2), *(3,))
foo(*(1,), *(2, 3))
# Another sequence type
foo(1, 2, *[100])
@@ -29,10 +35,16 @@ class A:
print(a, b, c)
a = A()
a.foo(*(), 1, 2, 3)
a.foo(*(1,), 2, 3)
a.foo(*(1, 2), 3)
a.foo(*(1, 2, 3))
a.foo(1, *(2, 3))
a.foo(1, 2, *(3,))
a.foo(1, 2, 3, *())
a.foo(*(1,), 2, *(3,))
a.foo(*(1, 2), *(3,))
a.foo(*(1,), *(2, 3))
# Another sequence type
a.foo(1, 2, *[100])