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Add empty tuple optimization #1178

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Merged
merged 2 commits into from
Jul 25, 2019
Merged

Add empty tuple optimization #1178

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8926c8f
Add empty tuple optimization
coolreader18 Jul 25, 2019
8aee745
Add test snippet for empty tuple
coolreader18 Jul 25, 2019
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6 changes: 6 additions & 0 deletions tests/snippets/tuple.py
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Original file line number Diff line number Diff line change
Expand Up @@ -38,3 +38,9 @@ def __eq__(self, x):
a = (1, 2, 3)
a += 1,
assert a == (1, 2, 3, 1)

assert () is ()

a = ()
b = ()
assert a is b
11 changes: 10 additions & 1 deletion vm/src/pyobject.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -146,6 +146,7 @@ pub struct PyContext {
pub none: PyNoneRef,
pub ellipsis: PyEllipsisRef,
pub not_implemented: PyNotImplementedRef,
pub empty_tuple: PyTupleRef,
pub tuple_type: PyClassRef,
pub tupleiterator_type: PyClassRef,
pub set_type: PyClassRef,
Expand Down Expand Up @@ -324,6 +325,9 @@ impl PyContext {

let true_value = create_object(PyInt::new(BigInt::one()), &bool_type);
let false_value = create_object(PyInt::new(BigInt::zero()), &bool_type);

let empty_tuple = create_object(PyTuple::from(vec![]), &tuple_type);

let context = PyContext {
bool_type,
memoryview_type,
Expand Down Expand Up @@ -382,6 +386,7 @@ impl PyContext {
weakproxy_type,
type_type,
exceptions,
empty_tuple,
};
objtype::init(&context);
objlist::init(&context);
Expand Down Expand Up @@ -645,7 +650,11 @@ impl PyContext {
}

pub fn new_tuple(&self, elements: Vec<PyObjectRef>) -> PyObjectRef {
PyObject::new(PyTuple::from(elements), self.tuple_type(), None)
if elements.is_empty() {
self.empty_tuple.clone().into_object()
} else {
PyObject::new(PyTuple::from(elements), self.tuple_type(), None)
}
}

pub fn new_list(&self, elements: Vec<PyObjectRef>) -> PyObjectRef {
Expand Down