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Copy pathtupleobject.rs
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185 lines (169 loc) · 5.62 KB
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use crate::PyObject;
use crate::object::define_py_check;
use crate::pystate::with_vm;
use crate::util::FfiPtrExt;
use core::ffi::c_int;
use core::ptr;
use core::slice;
use rustpython_vm::AsObject;
use rustpython_vm::builtins::PyTuple;
use rustpython_vm::sliceable::SliceableSequenceOp;
define_py_check!(fn PyTuple_Check, types.tuple_type);
define_py_check!(exact fn PyTuple_CheckExact, types.tuple_type);
#[unsafe(no_mangle)]
pub extern "C" fn PyTuple_New(len: isize) -> *mut PyObject {
with_vm(|vm| {
if len == 0 {
Ok(vm.ctx.empty_tuple.to_owned())
} else {
let len: usize = len
.try_into()
.map_err(|_| vm.new_system_error("Negative size passed to PyTuple_New"))?;
Ok(vm.new_tuple(vec![vm.ctx.none(); len]))
}
})
}
#[unsafe(no_mangle)]
pub unsafe extern "C" fn PyTuple_FromArray(
array: *const *mut PyObject,
size: isize,
) -> *mut PyObject {
with_vm(|vm| {
let size = size
.try_into()
.map_err(|_| vm.new_system_error("negative size passed to Tuple_FromArray"))?;
let slice = unsafe { slice::from_raw_parts(array, size) };
let elements = slice
.iter()
.map(|ptr| unsafe { ptr.assume_borrowed() }.to_owned())
.collect::<Vec<_>>();
Ok(vm.new_tuple(elements))
})
}
#[unsafe(no_mangle)]
pub unsafe extern "C" fn PyTuple_Pack(len: isize, mut args: ...) -> *mut PyObject {
with_vm(|vm| {
let len = len
.try_into()
.map_err(|_| vm.new_system_error("negative size passed to Tuple_Pack"))?;
let items = core::iter::repeat_with(|| unsafe {
args.next_arg::<*mut PyObject>()
.assume_borrowed()
.to_owned()
})
.take(len)
.collect::<Vec<_>>();
Ok(vm.new_tuple(items))
})
}
#[unsafe(no_mangle)]
pub unsafe extern "C" fn PyTuple_SetItem(
tuple: *mut PyObject,
pos: isize,
value: *mut PyObject,
) -> c_int {
with_vm(|vm| {
let tuple = unsafe { tuple.assume_borrowed_and_cast::<PyTuple>(vm)? };
let value = unsafe { value.assume_owned() };
let index: usize = pos
.try_into()
.map_err(|_| vm.new_index_error("negative position"))?;
if tuple.len() <= index {
Err(vm.new_index_error("tuple index out of range"))
} else if tuple.as_object().strong_count() > 1 {
Err(vm.new_system_error("Tuple objects are immutable when the reference count > 1"))
} else {
// SAFETY: We have exclusive access to the tuple payload (strong_count == 1),
// so mutating the selected element in place is valid.
let data_ptr = unsafe { tuple.as_ptr().add(index).cast_mut() };
unsafe { ptr::replace(data_ptr, value) };
Ok(())
}
})
}
#[unsafe(no_mangle)]
pub unsafe extern "C" fn PyTuple_Size(tuple: *mut PyObject) -> isize {
with_vm(|vm| {
let tuple = unsafe { tuple.assume_borrowed_and_cast::<PyTuple>(vm) }?;
Ok(tuple.as_slice().len())
})
}
#[unsafe(no_mangle)]
pub unsafe extern "C" fn PyTuple_GetItem(tuple: *mut PyObject, pos: isize) -> *mut PyObject {
with_vm(|vm| {
let tuple = unsafe { tuple.assume_borrowed_and_cast::<PyTuple>(vm) }?;
let result: &PyObject = pos
.try_into()
.ok()
.and_then(|index: usize| tuple.as_slice().get(index))
.ok_or_else(|| vm.new_index_error("tuple index out of range"))?;
Ok(result.as_raw())
})
}
#[unsafe(no_mangle)]
pub unsafe extern "C" fn PyTuple_GetSlice(
tuple: *mut PyObject,
low: isize,
high: isize,
) -> *mut PyObject {
with_vm(|vm| {
let tuple = unsafe { tuple.assume_borrowed_and_cast::<PyTuple>(vm) }?;
let len = tuple.as_slice().len() as isize;
let low = low.clamp(0, len);
let high = high.clamp(low, len);
let slice = tuple.as_slice().do_slice(low as usize..high as usize);
Ok(vm.ctx.new_tuple(slice))
})
}
#[cfg(test)]
mod tests {
use pyo3::ffi;
use pyo3::prelude::*;
use pyo3::types::PyTuple;
#[test]
fn empty_tuple() {
Python::attach(|py| {
let tuple = PyTuple::empty(py);
assert_eq!(tuple.len(), 0);
})
}
#[test]
fn tuple_into_python() {
Python::attach(|py| {
let tuple = (1, 2, 3).into_pyobject(py).unwrap();
assert_eq!(tuple.len(), 3);
})
}
#[test]
fn tuple_get_slice() {
Python::attach(|py| {
let tuple = (1, 2, 3).into_pyobject(py).unwrap();
let slice = tuple.get_slice(1, 2);
assert_eq!(slice.extract::<(u32,)>().unwrap(), (2,));
})
}
#[test]
fn tuple_is_mutable_with_one_ref() {
Python::attach(|py| {
let value: Bound<'_, _> = 1.into_pyobject(py).unwrap();
let tuple: Bound<'_, PyTuple> =
unsafe { Bound::from_owned_ptr(py, ffi::PyTuple_New(1)).cast_into_unchecked() };
assert!(tuple.get_item(0).unwrap().is_none());
unsafe {
assert_eq!(
ffi::PyTuple_SetItem(tuple.as_ptr(), 0, value.clone().into_ptr()),
0
);
}
assert_eq!(tuple.get_item(0).unwrap().extract::<u32>().unwrap(), 1);
let _new_ref = tuple.clone();
unsafe {
assert_eq!(
ffi::PyTuple_SetItem(tuple.as_ptr(), 0, value.clone().into_ptr()),
-1
);
}
assert!(PyErr::take(py).is_some())
})
}
}