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Copy patharray.rs
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1174 lines (1059 loc) · 43.8 KB
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use super::StgInfo;
use super::base::{CDATA_BUFFER_METHODS, PyCData};
use crate::common::lock::LazyLock;
use crate::sliceable::SaturatedSliceIter;
use crate::{
AsObject, Py, PyObject, PyObjectRef, PyPayload, PyRef, PyResult, TryFromObject, VirtualMachine,
atomic_func,
builtins::{
PyBytes, PyInt, PyList, PySlice, PyStr, PyType, PyTypeRef, genericalias::PyGenericAlias,
},
class::StaticType,
function::{ArgBytesLike, FuncArgs, PySetterValue},
protocol::{BufferDescriptor, PyBuffer, PyMappingMethods, PyNumberMethods, PySequenceMethods},
types::{AsBuffer, AsMapping, AsNumber, AsSequence, Constructor, Initializer},
};
use alloc::borrow::Cow;
use num_traits::{Signed, ToPrimitive};
use rustpython_host_env::ctypes::{
ArrayElementWriteValue, DecodedValue, WCHAR_SIZE, WCharArrayWriteError, char_array_field_value,
int_to_sized_bytes, read_array_element, simple_type_size, uint_to_sized_bytes,
wchar_from_bytes, write_array_element, write_char_array_raw, write_char_array_value,
write_wchar_array_value, wstring_from_bytes, zeroed_bytes,
};
/// Get itemsize from a PEP 3118 format string
/// Extracts the type code (last char after endianness prefix) and returns its size
fn get_size_from_format(fmt: &str) -> usize {
// Format is like "<f", ">q", etc. - strip endianness prefix and get type code
let code = fmt
.trim_start_matches(['<', '>', '@', '=', '!', '&'])
.chars()
.next()
.map(|c| c.to_string());
code.map_or(1, |c| simple_type_size(&c).unwrap_or(1))
}
/// Creates array type for (element_type, length)
/// Uses _array_type_cache to ensure identical calls return the same type object
pub(super) fn array_type_from_ctype(
itemtype: PyObjectRef,
length: usize,
vm: &VirtualMachine,
) -> PyResult {
// PyCArrayType_from_ctype
// Get the _array_type_cache from _ctypes module
let ctypes_module = vm.import("_ctypes", 0)?;
let cache = ctypes_module.get_attr("_array_type_cache", vm)?;
// Create cache key: (itemtype, length) tuple
let length_obj: PyObjectRef = vm.ctx.new_int(length).into();
let cache_key = vm.ctx.new_tuple(vec![itemtype.clone(), length_obj]);
// Check if already in cache
if let Ok(cached) = vm.call_method(&cache, "__getitem__", (cache_key.clone(),))
&& !vm.is_none(&cached)
{
return Ok(cached);
}
// Cache miss - create new array type
let itemtype_ref = itemtype
.downcast::<PyType>()
.map_err(|_| vm.new_type_error("Expected a type object"))?;
let item_stg = itemtype_ref
.stg_info_opt()
.ok_or_else(|| vm.new_type_error("_type_ must have storage info"))?;
let element_size = item_stg.size;
let element_align = item_stg.align;
let item_format = item_stg.format.clone();
let item_shape = item_stg.shape.clone();
let item_flags = item_stg.flags;
// Check overflow before multiplication
let total_size = element_size
.checked_mul(length)
.ok_or_else(|| vm.new_overflow_error("array too large"))?;
// format name: "c_int_Array_5"
let type_name = format!("{}_Array_{}", itemtype_ref.name(), length);
// Get item type code before moving itemtype
let item_type_code = itemtype_ref
.as_object()
.get_attr("_type_", vm)
.ok()
.and_then(|t| t.downcast_ref::<PyStr>().map(|s| s.to_string()));
let stg_info = StgInfo::new_array(
total_size,
element_align,
length,
itemtype_ref.clone(),
element_size,
item_format.as_deref(),
&item_shape,
item_flags,
);
let new_type = create_array_type_with_name(stg_info, &type_name, vm)?;
// Special case for character arrays - add value/raw attributes
let new_type_ref: PyTypeRef = new_type
.clone()
.downcast()
.map_err(|_| vm.new_type_error("expected type"))?;
match item_type_code.as_deref() {
Some("c") => add_char_array_getsets(&new_type_ref, vm),
Some("u") => add_wchar_array_getsets(&new_type_ref, vm),
_ => {}
}
// Store in cache
vm.call_method(&cache, "__setitem__", (cache_key, new_type.clone()))?;
Ok(new_type)
}
/// create_array_type_with_name - create array type with specified name
fn create_array_type_with_name(
stg_info: StgInfo,
type_name: &str,
vm: &VirtualMachine,
) -> PyResult {
let metaclass = PyCArrayType::static_type().to_owned();
let name = vm.ctx.new_str(type_name);
let bases = vm
.ctx
.new_tuple(vec![PyCArray::static_type().to_owned().into()]);
let dict = vm.ctx.new_dict();
let args = FuncArgs::new(
vec![name.into(), bases.into(), dict.into()],
crate::function::KwArgs::default(),
);
let new_type = crate::builtins::type_::PyType::slot_new(metaclass, args, vm)?;
let type_ref: PyTypeRef = new_type
.clone()
.downcast()
.map_err(|_| vm.new_type_error("Failed to create array type"))?;
// Set class attributes for _type_ and _length_
if let Some(element_type) = stg_info.element_type.clone() {
new_type.set_attr("_type_", element_type, vm)?;
}
new_type.set_attr("_length_", vm.ctx.new_int(stg_info.length), vm)?;
super::base::set_or_init_stginfo(&type_ref, stg_info);
Ok(new_type)
}
/// PyCArrayType - metatype for Array types
#[pyclass(name = "PyCArrayType", base = PyType, module = "_ctypes")]
#[derive(Debug)]
#[repr(transparent)]
pub(super) struct PyCArrayType(PyType);
// PyCArrayType implements Initializer for slots.init (PyCArrayType_init)
impl Initializer for PyCArrayType {
type Args = FuncArgs;
fn init(zelf: PyRef<Self>, _args: Self::Args, vm: &VirtualMachine) -> PyResult<()> {
// zelf is the newly created array type (e.g., T in "class T(Array)")
let new_type: &PyType = &zelf.0;
new_type.check_not_initialized(vm)?;
// 1. Get _length_ from class dict first
let direct_length = new_type
.attributes
.read()
.get(vm.ctx.intern_str("_length_"))
.cloned();
// 2. Get _type_ from class dict first
let direct_type = new_type
.attributes
.read()
.get(vm.ctx.intern_str("_type_"))
.cloned();
// 3. Find parent StgInfo from MRO (for inheritance)
// Note: PyType.mro does NOT include self, so no skip needed
let parent_stg_info = new_type
.mro
.read()
.iter()
.find_map(|base| base.stg_info_opt().map(|s| s.clone()));
// 4. Resolve _length_ (direct or inherited)
let length = if let Some(length_attr) = direct_length {
// Direct _length_ defined - validate it (PyLong_Check)
let length_int = length_attr
.downcast_ref::<PyInt>()
.ok_or_else(|| vm.new_type_error("The '_length_' attribute must be an integer"))?;
let bigint = length_int.as_bigint();
// Check sign first - negative values are ValueError
if bigint.is_negative() {
return Err(vm.new_value_error("The '_length_' attribute must not be negative"));
}
// Positive values that don't fit in usize are OverflowError
bigint
.to_usize()
.ok_or_else(|| vm.new_overflow_error("The '_length_' attribute is too large"))?
} else if let Some(ref parent_info) = parent_stg_info {
// Inherit from parent
parent_info.length
} else {
return Err(vm.new_attribute_error("class must define a '_length_' attribute"));
};
// 5. Resolve _type_ and get item_info (direct or inherited)
let (element_type, item_size, item_align, item_format, item_shape, item_flags) =
if let Some(type_attr) = direct_type {
// Direct _type_ defined - validate it (PyStgInfo_FromType)
let type_ref = type_attr
.downcast::<PyType>()
.map_err(|_| vm.new_type_error("_type_ must be a type"))?;
let (size, align, format, shape, flags) = {
let item_info = type_ref
.stg_info_opt()
.ok_or_else(|| vm.new_type_error("_type_ must have storage info"))?;
(
item_info.size,
item_info.align,
item_info.format.clone(),
item_info.shape.clone(),
item_info.flags,
)
};
(type_ref, size, align, format, shape, flags)
} else if let Some(ref parent_info) = parent_stg_info {
// Inherit from parent
let parent_type = parent_info
.element_type
.clone()
.ok_or_else(|| vm.new_type_error("_type_ must have storage info"))?;
(
parent_type,
parent_info.element_size,
parent_info.align,
parent_info.format.clone(),
parent_info.shape.clone(),
parent_info.flags,
)
} else {
return Err(vm.new_attribute_error("class must define a '_type_' attribute"));
};
// 6. Check overflow (item_size != 0 && length > MAX / item_size)
if item_size != 0 && length > usize::MAX / item_size {
return Err(vm.new_overflow_error("array too large"));
}
// 7. Initialize StgInfo (PyStgInfo_Init + field assignment)
let stg_info = StgInfo::new_array(
item_size * length, // size = item_size * length
item_align, // align = item_info->align
length, // length
element_type.clone(),
item_size, // element_size
item_format.as_deref(),
&item_shape,
item_flags,
);
// 8. Store StgInfo in type_data
super::base::set_or_init_stginfo(new_type, stg_info);
// 9. Get type code before moving element_type
let item_type_code = element_type
.as_object()
.get_attr("_type_", vm)
.ok()
.and_then(|t| t.downcast_ref::<PyStr>().map(|s| s.to_string()));
// 10. Set class attributes for _type_ and _length_
zelf.as_object().set_attr("_type_", element_type, vm)?;
zelf.as_object()
.set_attr("_length_", vm.ctx.new_int(length), vm)?;
// 11. Special case for character arrays - add value/raw attributes
// if (iteminfo->getfunc == _ctypes_get_fielddesc("c")->getfunc)
// add_getset((PyTypeObject*)self, CharArray_getsets);
// else if (iteminfo->getfunc == _ctypes_get_fielddesc("u")->getfunc)
// add_getset((PyTypeObject*)self, WCharArray_getsets);
// Get type ref for add_getset
let type_ref: PyTypeRef = zelf.as_object().to_owned().downcast().unwrap();
match item_type_code.as_deref() {
Some("c") => add_char_array_getsets(&type_ref, vm),
Some("u") => add_wchar_array_getsets(&type_ref, vm),
_ => {}
}
Ok(())
}
}
#[pyclass(flags(IMMUTABLETYPE), with(Initializer, AsNumber))]
impl PyCArrayType {
#[pygetset(name = "__pointer_type__")]
fn pointer_type(zelf: PyTypeRef, vm: &VirtualMachine) -> PyResult {
super::base::pointer_type_get(&zelf, vm)
}
#[pygetset(name = "__pointer_type__", setter)]
fn set_pointer_type(zelf: PyTypeRef, value: PyObjectRef, vm: &VirtualMachine) -> PyResult<()> {
super::base::pointer_type_set(&zelf, value, vm)
}
#[pymethod]
fn from_param(zelf: PyObjectRef, value: PyObjectRef, vm: &VirtualMachine) -> PyResult {
// zelf is the array type class that from_param was called on
let cls = zelf
.downcast::<PyType>()
.map_err(|_| vm.new_type_error("from_param: expected a type"))?;
// 1. If already an instance of the requested type, return it
if value.is_instance(cls.as_object(), vm)? {
return Ok(value);
}
// 2. Check for CArgObject (PyCArg_CheckExact)
if let Some(carg) = value.downcast_ref::<super::_ctypes::CArgObject>() {
// Check if the wrapped object is an instance of the requested type
if carg.obj.is_instance(cls.as_object(), vm)? {
return Ok(value); // Return the CArgObject as-is
}
}
// 3. Check for _as_parameter_ attribute
if let Ok(as_parameter) = value.get_attr("_as_parameter_", vm) {
return Self::from_param(cls.as_object().to_owned(), as_parameter, vm);
}
Err(vm.new_type_error(format!(
"expected {} instance instead of {}",
cls.name(),
value.class().name()
)))
}
}
impl AsNumber for PyCArrayType {
fn as_number() -> &'static PyNumberMethods {
static AS_NUMBER: PyNumberMethods = PyNumberMethods {
multiply: Some(|a, b, vm| {
// a is a type object whose metaclass is PyCArrayType (e.g., Array_5)
let n = b
.try_index(vm)?
.as_bigint()
.to_isize()
.ok_or_else(|| vm.new_overflow_error("array size too large"))?;
if n < 0 {
return Err(vm.new_value_error(format!("Array length must be >= 0, not {n}")));
}
// Check for overflow before creating the new array type
let zelf_type = a
.downcast_ref::<PyType>()
.ok_or_else(|| vm.new_type_error("Expected type"))?;
if let Some(stg_info) = zelf_type.stg_info_opt() {
let current_size = stg_info.size;
// Check if current_size * n would overflow
if current_size != 0 && (n as usize) > isize::MAX as usize / current_size {
return Err(vm.new_overflow_error("array too large"));
}
}
// Use cached array type creation
// The element type of the new array is the current array type itself
array_type_from_ctype(a.to_owned(), n as usize, vm)
}),
..PyNumberMethods::NOT_IMPLEMENTED
};
&AS_NUMBER
}
}
/// PyCArray - Array instance
/// All array metadata (element_type, length, element_size) is stored in the type's StgInfo
#[pyclass(
name = "Array",
base = PyCData,
metaclass = "PyCArrayType",
module = "_ctypes"
)]
#[derive(Debug)]
#[repr(transparent)]
pub(crate) struct PyCArray(pub PyCData);
impl PyCArray {
/// Get the type code of array element type (e.g., "c" for c_char, "u" for c_wchar)
fn get_element_type_code(zelf: &Py<Self>, vm: &VirtualMachine) -> Option<String> {
zelf.class()
.stg_info_opt()
.and_then(|info| info.element_type.clone())?
.as_object()
.get_attr("_type_", vm)
.ok()
.and_then(|t| t.downcast_ref::<PyStr>().map(|s| s.to_string()))
}
}
impl Constructor for PyCArray {
type Args = FuncArgs;
fn slot_new(cls: PyTypeRef, args: FuncArgs, vm: &VirtualMachine) -> PyResult {
// Check for abstract class - StgInfo must exist and be initialized
// Extract values in a block to drop the borrow before using cls
let (length, total_size) = {
let stg = cls.stg_info(vm)?;
(stg.length, stg.size)
};
// Check for too many initializers
if args.args.len() > length {
return Err(vm.new_index_error("too many initializers"));
}
// Create array with zero-initialized buffer
let buffer = vec![0u8; total_size];
let instance = Self(PyCData::from_bytes_with_length(buffer, None, length))
.into_ref_with_type(vm, cls)?;
// Initialize elements using setitem_by_index (Array_init pattern)
for (i, value) in args.args.iter().enumerate() {
Self::setitem_by_index(&instance, i as isize, value.clone(), vm)?;
}
Ok(instance.into())
}
fn py_new(_cls: &Py<PyType>, _args: Self::Args, _vm: &VirtualMachine) -> PyResult<Self> {
unimplemented!("use slot_new")
}
}
impl Initializer for PyCArray {
type Args = FuncArgs;
fn init(zelf: PyRef<Self>, args: Self::Args, vm: &VirtualMachine) -> PyResult<()> {
// Re-initialize array elements when __init__ is called
for (i, value) in args.args.iter().enumerate() {
Self::setitem_by_index(&zelf, i as isize, value.clone(), vm)?;
}
Ok(())
}
}
impl AsSequence for PyCArray {
fn as_sequence() -> &'static PySequenceMethods {
static AS_SEQUENCE: LazyLock<PySequenceMethods> = LazyLock::new(|| PySequenceMethods {
length: atomic_func!(|seq, _vm| {
let zelf = PyCArray::sequence_downcast(seq);
Ok(zelf.class().stg_info_opt().map_or(0, |i| i.length))
}),
item: atomic_func!(|seq, i, vm| {
let zelf = PyCArray::sequence_downcast(seq);
PyCArray::getitem_by_index(zelf, i, vm)
}),
ass_item: atomic_func!(|seq, i, value, vm| {
let zelf = PyCArray::sequence_downcast(seq);
match value {
Some(v) => PyCArray::setitem_by_index(zelf, i, v, vm),
None => Err(vm.new_type_error("cannot delete array elements")),
}
}),
..PySequenceMethods::NOT_IMPLEMENTED
});
&AS_SEQUENCE
}
}
impl AsMapping for PyCArray {
fn as_mapping() -> &'static PyMappingMethods {
static AS_MAPPING: LazyLock<PyMappingMethods> = LazyLock::new(|| PyMappingMethods {
length: atomic_func!(|mapping, _vm| {
let zelf = PyCArray::mapping_downcast(mapping);
Ok(zelf.class().stg_info_opt().map_or(0, |i| i.length))
}),
subscript: atomic_func!(|mapping, needle, vm| {
let zelf = PyCArray::mapping_downcast(mapping);
PyCArray::__getitem__(zelf, needle.to_owned(), vm)
}),
ass_subscript: atomic_func!(|mapping, needle, value, vm| {
let zelf = PyCArray::mapping_downcast(mapping);
match value {
Some(value) => PyCArray::__setitem__(zelf, needle.to_owned(), value, vm),
None => PyCArray::__delitem__(zelf, needle.to_owned(), vm),
}
}),
});
&AS_MAPPING
}
}
#[pyclass(
flags(BASETYPE, IMMUTABLETYPE),
with(Constructor, Initializer, AsSequence, AsMapping, AsBuffer)
)]
impl PyCArray {
#[pyclassmethod]
fn __class_getitem__(cls: PyTypeRef, args: PyObjectRef, vm: &VirtualMachine) -> PyGenericAlias {
PyGenericAlias::from_args(cls, args, vm)
}
fn int_to_bytes(i: &malachite_bigint::BigInt, size: usize) -> Vec<u8> {
// Try unsigned first (handles values like 0xFFFFFFFF that overflow signed)
// then fall back to signed (handles negative values)
match size {
1 => {
if let Some(v) = i.to_u8() {
vec![v]
} else {
vec![i.to_i8().unwrap_or(0) as u8]
}
}
2 => i.to_u16().map_or_else(
|| int_to_sized_bytes(i.to_i16().unwrap_or(0).into(), 2),
|v| uint_to_sized_bytes(v.into(), 2),
),
4 => i.to_u32().map_or_else(
|| int_to_sized_bytes(i.to_i32().unwrap_or(0).into(), 4),
|v| uint_to_sized_bytes(v.into(), 4),
),
8 => i.to_u64().map_or_else(
|| int_to_sized_bytes(i.to_i64().unwrap_or(0), 8),
|v| uint_to_sized_bytes(v, 8),
),
_ => zeroed_bytes(size),
}
}
fn getitem_by_index(zelf: &Py<Self>, i: isize, vm: &VirtualMachine) -> PyResult {
let stg = zelf.class().stg_info_opt();
let length = stg.as_ref().map_or(0, |i| i.length) as isize;
let index = if i < 0 { length + i } else { i };
if index < 0 || index >= length {
return Err(vm.new_index_error("invalid index"));
}
let index = index as usize;
let element_size = stg.as_ref().map_or(0, |i| i.element_size);
let offset = index * element_size;
let type_code = Self::get_element_type_code(zelf, vm);
// Get target buffer and offset (base's buffer if available, otherwise own)
let base_obj = zelf.0.base.read().clone();
let (buffer_lock, final_offset) = if let Some(cdata) = base_obj
.as_ref()
.and_then(|b| b.downcast_ref::<super::PyCData>())
{
(&cdata.buffer, zelf.0.base_offset.load() + offset)
} else {
(&zelf.0.buffer, offset)
};
let buffer = buffer_lock.read();
Ok(Self::read_element_from_buffer(
&buffer,
final_offset,
element_size,
type_code.as_deref(),
vm,
))
}
/// Helper to read an element value from a buffer at given offset
fn read_element_from_buffer(
buffer: &[u8],
offset: usize,
element_size: usize,
type_code: Option<&str>,
vm: &VirtualMachine,
) -> PyObjectRef {
match read_array_element(buffer, offset, element_size, type_code) {
DecodedValue::Bytes(bytes) => vm.ctx.new_bytes(bytes).into(),
DecodedValue::String(value) => vm.ctx.new_str(value).into(),
DecodedValue::Float(value) => vm.ctx.new_float(value).into(),
DecodedValue::Signed(value) => vm.ctx.new_int(value).into(),
DecodedValue::Unsigned(value) => vm.ctx.new_int(value).into(),
DecodedValue::None => vm.ctx.none(),
DecodedValue::Pointer(value) => vm.ctx.new_int(value).into(),
DecodedValue::Bool(value) => vm.ctx.new_bool(value).into(),
}
}
/// Helper to write an element value to a buffer at given offset
/// This is extracted to share code between direct write and base-buffer write
#[allow(clippy::too_many_arguments)]
fn write_element_to_buffer(
buffer: &mut [u8],
offset: usize,
element_size: usize,
type_code: Option<&str>,
value: &PyObject,
zelf: &Py<Self>,
index: usize,
vm: &VirtualMachine,
) -> PyResult<()> {
match type_code {
Some("c") => {
if let Some(b) = value.downcast_ref::<PyBytes>() {
write_array_element(
buffer,
offset,
ArrayElementWriteValue::Byte(b.as_bytes().first().copied().unwrap_or(0)),
);
} else if let Ok(int_val) = value.try_int(vm) {
write_array_element(
buffer,
offset,
ArrayElementWriteValue::Byte(int_val.as_bigint().to_u8().unwrap_or(0)),
);
} else {
return Err(vm.new_type_error("an integer or bytes of length 1 is required"));
}
}
Some("u") => {
if let Some(s) = value.downcast_ref::<PyStr>() {
let code = s.as_wtf8().code_points().next().map_or(0, |c| c.to_u32());
write_array_element(buffer, offset, ArrayElementWriteValue::Wchar(code));
} else {
return Err(vm.new_type_error("unicode string expected"));
}
}
Some("z") => {
let (ptr_val, converted) = if value.is(&vm.ctx.none) {
(0usize, None)
} else if let Some(bytes) = value.downcast_ref::<PyBytes>() {
let (kept_alive, ptr) = super::base::ensure_z_null_terminated(bytes, vm);
zelf.0.keep_alive(index, kept_alive);
(ptr, Some(value.to_owned()))
} else if let Ok(int_val) = value.try_index(vm) {
(int_val.as_bigint().to_usize().unwrap_or(0), None)
} else {
return Err(vm.new_type_error(format!(
"bytes or integer address expected instead of {} instance",
value.class().name()
)));
};
write_array_element(
buffer,
offset,
ArrayElementWriteValue::Pointer {
value: ptr_val,
size: element_size,
},
);
if let Some(c) = converted {
return zelf.0.keep_ref(index, c, vm);
}
}
Some("Z") => {
let (ptr_val, converted) = if value.is(&vm.ctx.none) {
(0usize, None)
} else if let Some(s) = value.downcast_ref::<PyStr>() {
let (holder, ptr) = super::base::str_to_wchar_bytes(s.as_wtf8(), vm);
(ptr, Some(holder))
} else if let Ok(int_val) = value.try_index(vm) {
(int_val.as_bigint().to_usize().unwrap_or(0), None)
} else {
return Err(vm.new_type_error("unicode string or integer address expected"));
};
write_array_element(
buffer,
offset,
ArrayElementWriteValue::Pointer {
value: ptr_val,
size: element_size,
},
);
if let Some(c) = converted {
return zelf.0.keep_ref(index, c, vm);
}
}
Some("f") => {
// c_float: convert int/float to f32 bytes
let f32_val = if let Ok(float_val) = value.try_float(vm) {
float_val.to_f64() as f32
} else if let Ok(int_val) = value.try_int(vm) {
int_val.as_bigint().to_f64().unwrap_or(0.0) as f32
} else {
return Err(vm.new_type_error("a float is required"));
};
write_array_element(
buffer,
offset,
ArrayElementWriteValue::Float {
value: f32_val.into(),
size: 4,
},
);
}
Some("d" | "g") => {
// c_double / c_longdouble: convert int/float to f64 bytes
let f64_val = if let Ok(float_val) = value.try_float(vm) {
float_val.to_f64()
} else if let Ok(int_val) = value.try_int(vm) {
int_val.as_bigint().to_f64().unwrap_or(0.0)
} else {
return Err(vm.new_type_error("a float is required"));
};
write_array_element(
buffer,
offset,
ArrayElementWriteValue::Float {
value: f64_val,
size: 8,
},
);
// For "g" type, remaining bytes stay zero
}
_ => {
// Handle ctypes instances (copy their buffer)
if let Some(cdata) = value.downcast_ref::<PyCData>() {
let src_buffer = cdata.buffer.read();
write_array_element(
buffer,
offset,
ArrayElementWriteValue::Bytes {
bytes: &src_buffer,
size: element_size,
},
);
// Other types: use int_to_bytes
} else if let Ok(int_val) = value.try_int(vm) {
let bytes = Self::int_to_bytes(int_val.as_bigint(), element_size);
write_array_element(
buffer,
offset,
ArrayElementWriteValue::Bytes {
bytes: &bytes,
size: element_size,
},
);
} else {
return Err(vm.new_type_error(format!(
"expected {} instance, not {}",
type_code.unwrap_or("value"),
value.class().name()
)));
}
}
}
// KeepRef
if super::base::PyCData::should_keep_ref(value) {
let to_keep = super::base::PyCData::get_kept_objects(value, vm);
zelf.0.keep_ref(index, to_keep, vm)?;
}
Ok(())
}
fn setitem_by_index(
zelf: &Py<Self>,
i: isize,
value: PyObjectRef,
vm: &VirtualMachine,
) -> PyResult<()> {
let stg = zelf.class().stg_info_opt();
let length = stg.as_ref().map_or(0, |i| i.length) as isize;
let index = if i < 0 { length + i } else { i };
if index < 0 || index >= length {
return Err(vm.new_index_error("invalid index"));
}
let index = index as usize;
let element_size = stg.as_ref().map_or(0, |i| i.element_size);
let offset = index * element_size;
let type_code = Self::get_element_type_code(zelf, vm);
// Get target buffer and offset (base's buffer if available, otherwise own)
let base_obj = zelf.0.base.read().clone();
let (buffer_lock, final_offset) = if let Some(cdata) = base_obj
.as_ref()
.and_then(|b| b.downcast_ref::<super::PyCData>())
{
(&cdata.buffer, zelf.0.base_offset.load() + offset)
} else {
(&zelf.0.buffer, offset)
};
let mut buffer = buffer_lock.write();
// For shared memory (Cow::Borrowed), we need to write directly to the memory
// For owned memory (Cow::Owned), we can write to the owned buffer
match &mut *buffer {
Cow::Borrowed(slice) => {
// SAFETY: For from_buffer, the slice points to writable shared memory.
// Python's from_buffer requires writable buffer, so this is safe.
let owned_slice =
unsafe { rustpython_host_env::ctypes::borrowed_slice_as_mut(slice) };
Self::write_element_to_buffer(
owned_slice,
final_offset,
element_size,
type_code.as_deref(),
&value,
zelf,
index,
vm,
)
}
Cow::Owned(vec) => Self::write_element_to_buffer(
vec,
final_offset,
element_size,
type_code.as_deref(),
&value,
zelf,
index,
vm,
),
}
}
// Array_subscript
fn __getitem__(zelf: &Py<Self>, item: PyObjectRef, vm: &VirtualMachine) -> PyResult {
// PyIndex_Check
if let Some(i) = item.downcast_ref::<PyInt>() {
let i = i.as_bigint().to_isize().ok_or_else(|| {
vm.new_index_error("cannot fit index into an index-sized integer")
})?;
// getitem_by_index handles negative index normalization
Self::getitem_by_index(zelf, i, vm)
}
// PySlice_Check
else if let Some(slice) = item.downcast_ref::<PySlice>() {
Self::getitem_by_slice(zelf, slice, vm)
} else {
Err(vm.new_type_error("indices must be integers"))
}
}
// Array_subscript slice handling
fn getitem_by_slice(zelf: &Py<Self>, slice: &PySlice, vm: &VirtualMachine) -> PyResult {
let stg = zelf.class().stg_info_opt();
let length = stg.as_ref().map_or(0, |i| i.length);
// PySlice_Unpack + PySlice_AdjustIndices
let sat_slice = slice.to_saturated(vm)?;
let (range, step, slice_len) = sat_slice.adjust_indices(length);
let type_code = Self::get_element_type_code(zelf, vm);
let element_size = stg.as_ref().map_or(0, |i| i.element_size);
let start = range.start;
match type_code.as_deref() {
// c_char → bytes (item_info->getfunc == "c")
Some("c") => {
if slice_len == 0 {
return Ok(vm.ctx.new_bytes(vec![]).into());
}
let buffer = zelf.0.buffer.read();
// step == 1 optimization: direct memcpy
if step == 1 {
let start_offset = start * element_size;
let end_offset = start_offset + slice_len;
if end_offset <= buffer.len() {
return Ok(vm
.ctx
.new_bytes(buffer[start_offset..end_offset].to_vec())
.into());
}
}
// Non-contiguous: iterate
let iter = SaturatedSliceIter::from_adjust_indices(range, step, slice_len);
let mut result = Vec::with_capacity(slice_len);
for idx in iter {
let offset = idx * element_size;
if offset < buffer.len() {
result.push(buffer[offset]);
}
}
Ok(vm.ctx.new_bytes(result).into())
}
// c_wchar → str (item_info->getfunc == "u")
Some("u") => {
if slice_len == 0 {
return Ok(vm.ctx.new_str("").into());
}
let buffer = zelf.0.buffer.read();
// step == 1 optimization: direct conversion
if step == 1 {
let start_offset = start * WCHAR_SIZE;
let end_offset = start_offset + slice_len * WCHAR_SIZE;
if end_offset <= buffer.len() {
let wchar_bytes = &buffer[start_offset..end_offset];
let result: String = wchar_bytes
.chunks(WCHAR_SIZE)
.filter_map(|chunk| wchar_from_bytes(chunk).and_then(char::from_u32))
.collect();
return Ok(vm.ctx.new_str(result).into());
}
}
// Non-contiguous: iterate
let iter = SaturatedSliceIter::from_adjust_indices(range, step, slice_len);
let mut result = String::with_capacity(slice_len);
for idx in iter {
let offset = idx * WCHAR_SIZE;
if let Some(code_point) = wchar_from_bytes(&buffer[offset..])
&& let Some(c) = char::from_u32(code_point)
{
result.push(c);
}
}
Ok(vm.ctx.new_str(result).into())
}
// Other types → list (PyList_New + Array_item for each)
_ => {
let iter = SaturatedSliceIter::from_adjust_indices(range, step, slice_len);
let mut result = Vec::with_capacity(slice_len);
for idx in iter {
result.push(Self::getitem_by_index(zelf, idx as isize, vm)?);
}
Ok(PyList::from(result).into_ref(&vm.ctx).into())
}
}
}
// Array_ass_subscript
fn __setitem__(
zelf: &Py<Self>,
item: PyObjectRef,
value: PyObjectRef,
vm: &VirtualMachine,
) -> PyResult<()> {
// Array does not support item deletion
// (handled implicitly - value is always provided in __setitem__)
// PyIndex_Check
if let Some(i) = item.downcast_ref::<PyInt>() {
let i = i.as_bigint().to_isize().ok_or_else(|| {
vm.new_index_error("cannot fit index into an index-sized integer")
})?;
// setitem_by_index handles negative index normalization
Self::setitem_by_index(zelf, i, value, vm)
}
// PySlice_Check
else if let Some(slice) = item.downcast_ref::<PySlice>() {
Self::setitem_by_slice(zelf, slice, value, vm)
} else {
Err(vm.new_type_error("indices must be integer"))
}
}
// Array does not support item deletion
fn __delitem__(&self, _item: PyObjectRef, vm: &VirtualMachine) -> PyResult<()> {
Err(vm.new_type_error("Array does not support item deletion"))
}
// Array_ass_subscript slice handling
fn setitem_by_slice(
zelf: &Py<Self>,
slice: &PySlice,
value: PyObjectRef,
vm: &VirtualMachine,
) -> PyResult<()> {
let length = zelf.class().stg_info_opt().map_or(0, |i| i.length);
// PySlice_Unpack + PySlice_AdjustIndices
let sat_slice = slice.to_saturated(vm)?;
let (range, step, slice_len) = sat_slice.adjust_indices(length);
// other_len = PySequence_Length(value);
let items: Vec<PyObjectRef> = vm.extract_elements_with(&value, Ok)?;
let other_len = items.len();
if other_len != slice_len {
return Err(vm.new_value_error("Can only assign sequence of same size"));
}
// Use SaturatedSliceIter for correct index iteration (handles negative step)
let iter = SaturatedSliceIter::from_adjust_indices(range, step, slice_len);
for (idx, item) in iter.zip(items) {
Self::setitem_by_index(zelf, idx as isize, item, vm)?;
}
Ok(())
}
fn __len__(zelf: &Py<Self>, _vm: &VirtualMachine) -> usize {
zelf.class().stg_info_opt().map_or(0, |i| i.length)
}
}
impl AsBuffer for PyCArray {
fn as_buffer(zelf: &Py<Self>, _vm: &VirtualMachine) -> PyResult<PyBuffer> {
let buffer_len = zelf.0.buffer.read().len();