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271 lines (228 loc) · 10.9 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.Numerics;
using System.Reflection.Emit;
using Microsoft.Scripting;
using Microsoft.Scripting.Runtime;
using IronPython.Runtime;
using IronPython.Runtime.Operations;
using IronPython.Runtime.Types;
namespace IronPython.Modules {
/// <summary>
/// Provides support for interop with native code from Python code.
/// </summary>
public static partial class CTypes {
/// <summary>
/// The meta class for ctypes pointers.
/// </summary>
[PythonType, PythonHidden]
public class PointerType : PythonType, INativeType {
internal INativeType _type;
private readonly string _typeFormat;
public PointerType(CodeContext/*!*/ context, string name, PythonTuple bases, PythonDictionary members)
: base(context, name, bases, members) {
object type;
if (members.TryGetValue("_type_", out type) && !(type is INativeType)) {
throw PythonOps.TypeError("_type_ must be a type");
}
_type = (INativeType)type;
if (_type != null) {
_typeFormat = _type.TypeFormat;
}
}
private PointerType(Type underlyingSystemType)
: base(underlyingSystemType) {
}
public object from_param([NotNull]CData obj) {
return new NativeArgument((CData)PythonCalls.Call(this, obj), "P");
}
/// <summary>
/// Converts an object into a function call parameter.
/// </summary>
public object from_param(Pointer obj) {
if (obj == null) {
return ScriptingRuntimeHelpers.Int32ToObject(0);
}
if (obj.NativeType != this) {
throw PythonOps.TypeError("assign to pointer of type {0} from {1} is not valid", Name, ((PythonType)obj.NativeType).Name);
}
Pointer res = (Pointer)PythonCalls.Call(this);
res._memHolder.WriteIntPtr(0, obj._memHolder.ReadMemoryHolder(0));
return res;
}
public object from_param([NotNull]NativeArgument obj) {
return (CData)PythonCalls.Call(this, obj._obj);
}
/// <summary>
/// Access an instance at the specified address
/// </summary>
public object from_address(object obj) {
throw new NotImplementedException("pointer from address");
}
public void set_type(PythonType type) {
_type = (INativeType)type;
}
internal static PythonType MakeSystemType(Type underlyingSystemType) {
return PythonType.SetPythonType(underlyingSystemType, new PointerType(underlyingSystemType));
}
public static ArrayType/*!*/ operator *(PointerType type, int count) {
return MakeArrayType(type, count);
}
public static ArrayType/*!*/ operator *(int count, PointerType type) {
return MakeArrayType(type, count);
}
#region INativeType Members
int INativeType.Size {
get {
return IntPtr.Size;
}
}
int INativeType.Alignment {
get {
return IntPtr.Size;
}
}
object INativeType.GetValue(MemoryHolder owner, object readingFrom, int offset, bool raw) {
if (!raw) {
Pointer res = (Pointer)PythonCalls.Call(Context.SharedContext, this);
res._memHolder.WriteIntPtr(0, owner.ReadIntPtr(offset));
res._memHolder.AddObject(offset, readingFrom);
return res;
}
return owner.ReadIntPtr(offset).ToPython();
}
object INativeType.SetValue(MemoryHolder address, int offset, object value) {
Pointer ptr;
_Array array;
if (value == null) {
address.WriteIntPtr(offset, IntPtr.Zero);
} else if (value is int) {
address.WriteIntPtr(offset, new IntPtr((int)value));
} else if (value is BigInteger) {
address.WriteIntPtr(offset, new IntPtr((long)(BigInteger)value));
} else if ((ptr = value as Pointer) != null) {
address.WriteIntPtr(offset, ptr._memHolder.ReadMemoryHolder(0));
return PythonOps.MakeDictFromItems(ptr, "0", ptr._objects, "1");
} else if ((array = value as _Array) != null) {
address.WriteIntPtr(offset, array._memHolder);
return array;
} else {
throw PythonOps.TypeErrorForTypeMismatch(Name, value);
}
return null;
}
Type INativeType.GetNativeType() {
return typeof(IntPtr);
}
MarshalCleanup INativeType.EmitMarshalling(ILGenerator/*!*/ method, LocalOrArg argIndex, List<object>/*!*/ constantPool, int constantPoolArgument) {
Type argumentType = argIndex.Type;
Label nextTry = method.DefineLabel();
Label done = method.DefineLabel();
if (!argumentType.IsValueType) {
argIndex.Emit(method);
method.Emit(OpCodes.Ldnull);
method.Emit(OpCodes.Bne_Un, nextTry);
method.Emit(OpCodes.Ldc_I4_0);
method.Emit(OpCodes.Conv_I);
method.Emit(OpCodes.Br, done);
}
method.MarkLabel(nextTry);
nextTry = method.DefineLabel();
argIndex.Emit(method);
if (argumentType.IsValueType) {
method.Emit(OpCodes.Box, argumentType);
}
constantPool.Add(this);
SimpleType st = _type as SimpleType;
MarshalCleanup res = null;
if (st != null && !argIndex.Type.IsValueType) {
if (st._type == SimpleTypeKind.Char || st._type == SimpleTypeKind.WChar) {
if (st._type == SimpleTypeKind.Char) {
SimpleType.TryToCharPtrConversion(method, argIndex, argumentType, done);
} else {
SimpleType.TryArrayToWCharPtrConversion(method, argIndex, argumentType, done);
}
Label notStr = method.DefineLabel();
LocalOrArg str = argIndex;
if (argumentType != typeof(string)) {
LocalBuilder lb = method.DeclareLocal(typeof(string));
method.Emit(OpCodes.Isinst, typeof(string));
method.Emit(OpCodes.Brfalse, notStr);
argIndex.Emit(method);
method.Emit(OpCodes.Castclass, typeof(string));
method.Emit(OpCodes.Stloc, lb);
method.Emit(OpCodes.Ldloc, lb);
str = new Local(lb);
}
if (st._type == SimpleTypeKind.Char) {
res = SimpleType.MarshalCharPointer(method, str);
} else {
SimpleType.MarshalWCharPointer(method, str);
}
method.Emit(OpCodes.Br, done);
method.MarkLabel(notStr);
argIndex.Emit(method);
}
}
// native argument being pased (byref)
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("CheckNativeArgument"));
method.Emit(OpCodes.Dup);
method.Emit(OpCodes.Brfalse, nextTry);
method.Emit(OpCodes.Call, typeof(CData).GetMethod("get_UnsafeAddress"));
method.Emit(OpCodes.Br, done);
// lone cdata being passed
method.MarkLabel(nextTry);
nextTry = method.DefineLabel();
method.Emit(OpCodes.Pop); // extra null native arg
argIndex.Emit(method);
if (argumentType.IsValueType) {
method.Emit(OpCodes.Box, argumentType);
}
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("TryCheckCDataPointerType"));
method.Emit(OpCodes.Dup);
method.Emit(OpCodes.Brfalse, nextTry);
method.Emit(OpCodes.Call, typeof(CData).GetMethod("get_UnsafeAddress"));
method.Emit(OpCodes.Br, done);
// pointer object being passed
method.MarkLabel(nextTry);
method.Emit(OpCodes.Pop); // extra null cdata
argIndex.Emit(method);
if (argumentType.IsValueType) {
method.Emit(OpCodes.Box, argumentType);
}
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("CheckCDataType"));
method.Emit(OpCodes.Call, typeof(CData).GetMethod("get_UnsafeAddress"));
method.Emit(OpCodes.Ldind_I);
method.MarkLabel(done);
return res;
}
Type/*!*/ INativeType.GetPythonType() {
return typeof(object);
}
void INativeType.EmitReverseMarshalling(ILGenerator method, LocalOrArg value, List<object> constantPool, int constantPoolArgument) {
value.Emit(method);
EmitCDataCreation(this, method, constantPool, constantPoolArgument);
}
string INativeType.TypeFormat {
get {
return "&" + (_typeFormat ?? _type.TypeFormat);
}
}
#endregion
}
}
}
#endif