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375 lines (313 loc) · 15.1 KB
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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the Apache 2.0 License.
// See the LICENSE file in the project root for more information.
#if FEATURE_CTYPES
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Numerics;
using System.Reflection.Emit;
using System.Runtime.InteropServices;
using IronPython.Runtime;
using IronPython.Runtime.Operations;
using IronPython.Runtime.Types;
using Microsoft.Scripting.Utils;
namespace IronPython.Modules {
/// <summary>
/// Provides support for interop with native code from Python code.
/// </summary>
public static partial class CTypes {
private static WeakDictionary<PythonType, Dictionary<int, ArrayType>> _arrayTypes = new WeakDictionary<PythonType, Dictionary<int, ArrayType>>();
/// <summary>
/// The meta class for ctypes array instances.
/// </summary>
[PythonType, PythonHidden]
public class ArrayType : PythonType, INativeType {
private int _length;
private INativeType _type;
public ArrayType(CodeContext/*!*/ context, string name, PythonTuple bases, PythonDictionary dict)
: base(context, name, bases, dict) {
// TODO: is using TryGetBoundAttr the proper way to check the base types? similarly on the _type_ check
if (!dict.TryGetValue("_length_", out object len) && !TryGetBoundAttr(context, this, "_length_", out len)) {
throw PythonOps.AttributeError("arrays must have _length_ attribute and it must be a positive integer");
}
int iLen = len switch {
BigInteger bi => checked((int)bi),
int i => i,
_ => throw PythonOps.AttributeError("arrays must have _length_ attribute and it must be a positive integer"),
};
if (iLen < 0) throw PythonOps.AttributeError("arrays must have _length_ attribute and it must be a positive integer"); // TODO: ValueError with 3.8
object type;
if (!dict.TryGetValue("_type_", out type) && !TryGetBoundAttr(context, this, "_type_", out type)) {
throw PythonOps.AttributeError("class must define a '_type_' attribute");
}
_length = iLen;
_type = (INativeType)type;
if (_type is SimpleType st) {
if (st._type == SimpleTypeKind.Char) {
SetCustomMember(context,
"value",
new ReflectedExtensionProperty(
new ExtensionPropertyInfo(this, typeof(CTypes).GetMethod(nameof(CTypes.GetCharArrayValue))),
NameType.Property | NameType.Python
)
);
SetCustomMember(context,
"raw",
new ReflectedExtensionProperty(
new ExtensionPropertyInfo(this, typeof(CTypes).GetMethod(nameof(CTypes.GetCharArrayRaw))),
NameType.Property | NameType.Python
)
);
} else if (st._type == SimpleTypeKind.WChar) {
SetCustomMember(context,
"value",
new ReflectedExtensionProperty(
new ExtensionPropertyInfo(this, typeof(CTypes).GetMethod(nameof(CTypes.GetWCharArrayValue))),
NameType.Property | NameType.Python
)
);
}
}
}
private ArrayType(Type underlyingSystemType)
: base(underlyingSystemType) {
}
public _Array from_address(CodeContext/*!*/ context, int ptr) {
_Array res = (_Array)CreateInstance(context);
res.SetAddress(new IntPtr(ptr));
return res;
}
public _Array from_address(CodeContext/*!*/ context, BigInteger ptr) {
_Array res = (_Array)CreateInstance(context);
res.SetAddress(new IntPtr((long)ptr));
return res;
}
public _Array from_buffer(CodeContext/*!*/ context, object/*?*/ data, int offset = 0) {
_Array res = (_Array)CreateInstance(context);
res.InitializeFromBuffer(data, offset, ((INativeType)this).Size);
return res;
}
public _Array from_buffer_copy(CodeContext/*!*/ context, object/*?*/ data, int offset = 0) {
_Array res = (_Array)CreateInstance(context);
res.InitializeFromBufferCopy(data, offset, ((INativeType)this).Size);
return res;
}
/// <summary>
/// Converts an object into a function call parameter.
/// </summary>
public object from_param(object obj) {
return null;
}
internal static PythonType MakeSystemType(Type underlyingSystemType) {
return PythonType.SetPythonType(underlyingSystemType, new ArrayType(underlyingSystemType));
}
public static ArrayType/*!*/ operator *(ArrayType type, int count) {
return MakeArrayType(type, count);
}
public static ArrayType/*!*/ operator *(int count, ArrayType type) {
return MakeArrayType(type, count);
}
#region INativeType Members
int INativeType.Size {
get {
return GetSize();
}
}
private int GetSize() {
return _length * _type.Size;
}
int INativeType.Alignment {
get {
return _type.Alignment;
}
}
object INativeType.GetValue(MemoryHolder owner, object readingFrom, int offset, bool raw) {
if (_type is SimpleType st) {
if (st._type == SimpleTypeKind.Char) {
var str = owner.ReadBytes(offset, _length);
// remove any trailing nulls
for (int i = 0; i < str.Count; i++) {
if (str[i] == 0) {
return new Bytes(str.Substring(0, i));
}
}
return str;
}
if (st._type == SimpleTypeKind.WChar) {
string str = owner.ReadUnicodeString(offset, _length);
// remove any trailing nulls
for (int i = 0; i < str.Length; i++) {
if (str[i] == '\x00') {
return str.Substring(0, i);
}
}
return str;
}
}
_Array arr = (_Array)CreateInstance(Context.SharedContext);
arr.MemHolder = new MemoryHolder(owner.UnsafeAddress.Add(offset), ((INativeType)this).Size, owner);
return arr;
}
internal object GetRawValue(MemoryHolder owner, int offset) {
Debug.Assert(_type is SimpleType st && st._type == SimpleTypeKind.Char);
return owner.ReadBytes(offset, _length);
}
internal void SetRawValue(MemoryHolder owner, int offset, object value) {
Debug.Assert(_type is SimpleType st && st._type == SimpleTypeKind.Char);
if (value is IBufferProtocol bufferProtocol) {
var buffer = bufferProtocol.GetBuffer();
var span = buffer.AsReadOnlySpan();
if (span.Length > _length) {
throw PythonOps.ValueError("byte string too long ({0}, maximum length {1})", span.Length, _length);
}
owner.WriteSpan(offset, span);
return;
}
throw PythonOps.TypeErrorForBytesLikeTypeMismatch(value);
}
object INativeType.SetValue(MemoryHolder address, int offset, object value) {
if (_type is SimpleType st) {
if (st._type == SimpleTypeKind.Char) {
if (value is Bytes bytes) {
if (bytes.Count > _length) {
throw PythonOps.ValueError("byte string too long ({0}, maximum length {1})", bytes.Count, _length);
}
WriteBytes(address, offset, bytes);
return null;
}
throw PythonOps.TypeError("expected bytes, {0} found", PythonOps.GetPythonTypeName(value));
}
if (st._type == SimpleTypeKind.WChar) {
if (value is string str) {
if (str.Length > _length) {
throw PythonOps.ValueError("string too long ({0}, maximum length {1})", str.Length, _length);
}
WriteString(address, offset, str);
return null;
}
throw PythonOps.TypeError("unicode string expected instead of {0} instance", PythonOps.GetPythonTypeName(value));
}
}
object[] arrArgs = value as object[];
if (arrArgs == null) {
if (value is PythonTuple pt) {
arrArgs = pt._data;
}
}
if (arrArgs != null) {
if (arrArgs.Length > _length) {
throw PythonOps.RuntimeError("invalid index");
}
for (int i = 0; i < arrArgs.Length; i++) {
_type.SetValue(address, checked(offset + i * _type.Size), arrArgs[i]);
}
} else {
if (value is _Array arr && arr.NativeType == this) {
arr.MemHolder.CopyTo(address, offset, ((INativeType)this).Size);
return arr.MemHolder.EnsureObjects();
}
throw PythonOps.TypeError("unexpected {0} instance, got {1}", Name, PythonOps.GetPythonTypeName(value));
}
return null;
}
private void WriteBytes(MemoryHolder address, int offset, Bytes bytes) {
SimpleType st = (SimpleType)_type;
Debug.Assert(st._type == SimpleTypeKind.Char && bytes.Count <= _length);
address.WriteSpan(offset, bytes.AsSpan());
if (bytes.Count < _length) {
address.WriteByte(checked(offset + bytes.Count), 0);
}
}
private void WriteString(MemoryHolder address, int offset, string str) {
SimpleType st = (SimpleType)_type;
Debug.Assert(st._type == SimpleTypeKind.WChar && str.Length <= _length);
if (str.Length < _length) {
str = str + '\x00';
}
address.WriteUnicodeString(offset, str);
}
Type/*!*/ INativeType.GetNativeType() {
return typeof(IntPtr);
}
MarshalCleanup INativeType.EmitMarshalling(ILGenerator/*!*/ method, LocalOrArg argIndex, List<object>/*!*/ constantPool, int constantPoolArgument) {
Type argumentType = argIndex.Type;
Label done = method.DefineLabel();
if (!argumentType.IsValueType) {
Label next = method.DefineLabel();
argIndex.Emit(method);
method.Emit(OpCodes.Ldnull);
method.Emit(OpCodes.Bne_Un, next);
method.Emit(OpCodes.Ldc_I4_0);
method.Emit(OpCodes.Conv_I);
method.Emit(OpCodes.Br, done);
method.MarkLabel(next);
}
argIndex.Emit(method);
if (argumentType.IsValueType) {
method.Emit(OpCodes.Box, argumentType);
}
constantPool.Add(this);
method.Emit(OpCodes.Ldarg, constantPoolArgument);
method.Emit(OpCodes.Ldc_I4, constantPool.Count - 1);
method.Emit(OpCodes.Ldelem_Ref);
method.Emit(OpCodes.Call, typeof(ModuleOps).GetMethod(nameof(ModuleOps.CheckCDataType)));
method.Emit(OpCodes.Call, typeof(CData).GetProperty(nameof(CData.UnsafeAddress)).GetGetMethod());
method.MarkLabel(done);
return null;
}
Type/*!*/ INativeType.GetPythonType() {
return ((INativeType)this).GetNativeType();
}
void INativeType.EmitReverseMarshalling(ILGenerator method, LocalOrArg value, List<object> constantPool, int constantPoolArgument) {
// TODO: Implement me
value.Emit(method);
}
#endregion
internal int Length {
get {
return _length;
}
}
internal INativeType ElementType {
get {
return _type;
}
}
string INativeType.TypeFormat {
get {
return _type.TypeFormat;
}
}
internal string ShapeAndFormatRepr() {
string size = "(" + Length;
INativeType elemType = _type;
while (elemType is ArrayType arrayType) {
size += "," + arrayType.Length;
elemType = arrayType.ElementType;
}
size += ")";
return size + _type.TypeFormat;
}
}
private static ArrayType/*!*/ MakeArrayType(PythonType type, int count) {
if (count < 0) {
throw PythonOps.ValueError("cannot multiply ctype by negative number");
}
lock (_arrayTypes) {
if (!_arrayTypes.TryGetValue(type, out Dictionary<int, ArrayType> countDict)) {
_arrayTypes[type] = countDict = new Dictionary<int, ArrayType>();
}
if (!countDict.TryGetValue(count, out ArrayType res)) {
res = countDict[count] = new ArrayType(type.Context.SharedContext,
type.Name + "_Array_" + count,
PythonTuple.MakeTuple(Array),
PythonOps.MakeDictFromItems(new object[] { type, "_type_", count, "_length_" })
);
}
return res;
}
}
}
}
#endif