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methodbinding.cs
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359 lines (317 loc) · 12 KB
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using System;
using System.Collections.Generic;
using System.Reflection;
using System.Linq;
using System.Diagnostics;
namespace Python.Runtime
{
/// <summary>
/// Implements a Python binding type for CLR methods. These work much like
/// standard Python method bindings, but the same type is used to bind
/// both static and instance methods.
/// </summary>
internal class MethodBinding : ExtensionType
{
internal MethodInfo info;
internal MethodObject m;
internal IntPtr target;
internal IntPtr targetType;
public MethodBinding(MethodObject m, IntPtr target, IntPtr targetType)
{
Runtime.XIncref(target);
this.target = target;
Runtime.XIncref(targetType);
if (targetType == IntPtr.Zero)
{
targetType = Runtime.PyObject_Type(target);
}
this.targetType = targetType;
this.info = null;
this.m = m;
}
public MethodBinding(MethodObject m, IntPtr target) : this(m, target, IntPtr.Zero)
{
}
/// <summary>
/// Implement binding of generic methods using the subscript syntax [].
/// </summary>
public static IntPtr mp_subscript(IntPtr tp, IntPtr idx)
{
var self = (MethodBinding)GetManagedObject(tp);
Type[] types = Runtime.PythonArgsToTypeArray(idx);
if (types == null)
{
return Exceptions.RaiseTypeError("type(s) expected");
}
MethodInfo mi = MethodBinder.MatchParameters(self.m.info, types);
if (mi == null)
{
return Exceptions.RaiseTypeError("No match found for given type params");
}
var mb = new MethodBinding(self.m, self.target) { info = mi };
Runtime.XIncref(mb.pyHandle);
return mb.pyHandle;
}
/// <summary>
/// MethodBinding __getattribute__ implementation.
/// </summary>
public static IntPtr tp_getattro(IntPtr ob, IntPtr key)
{
var self = (MethodBinding)GetManagedObject(ob);
if (!Runtime.PyString_Check(key))
{
Exceptions.SetError(Exceptions.TypeError, "string expected");
return IntPtr.Zero;
}
string name = Runtime.GetManagedString(key);
switch (name)
{
case "__doc__":
IntPtr doc = self.m.GetDocString();
Runtime.XIncref(doc);
return doc;
// FIXME: deprecate __overloads__ soon...
case "__overloads__":
case "Overloads":
var om = new OverloadMapper(self.m, self.target);
Runtime.XIncref(om.pyHandle);
return om.pyHandle;
default:
return Runtime.PyObject_GenericGetAttr(ob, key);
}
}
/// <summary>
/// MethodBinding __call__ implementation.
/// </summary>
public static IntPtr tp_call(IntPtr ob, IntPtr args, IntPtr kw)
{
var self = (MethodBinding)GetManagedObject(ob);
// This works around a situation where the wrong generic method is picked,
// for example this method in the tests: string Overloaded<T>(int arg1, int arg2, string arg3)
if (self.info != null)
{
if (self.info.IsGenericMethod)
{
int len = Runtime.PyTuple_Size(args); //FIXME: Never used
Type[] sigTp = Runtime.PythonArgsToTypeArray(args, true);
if (sigTp != null)
{
Type[] genericTp = self.info.GetGenericArguments();
MethodInfo betterMatch = MethodBinder.MatchSignatureAndParameters(self.m.info, genericTp, sigTp);
if (betterMatch != null)
{
self.info = betterMatch;
}
}
}
}
// This supports calling a method 'unbound', passing the instance
// as the first argument. Note that this is not supported if any
// of the overloads are static since we can't know if the intent
// was to call the static method or the unbound instance method.
var disposeList = new List<IntPtr>();
try
{
IntPtr target = self.target;
if (target == IntPtr.Zero && !self.m.IsStatic())
{
int len = Runtime.PyTuple_Size(args);
if (len < 1)
{
Exceptions.SetError(Exceptions.TypeError, "not enough arguments");
return IntPtr.Zero;
}
target = Runtime.PyTuple_GetItem(args, 0);
Runtime.XIncref(target);
disposeList.Add(target);
args = Runtime.PyTuple_GetSlice(args, 1, len);
disposeList.Add(args);
}
// if the class is a IPythonDerivedClass and target is not the same as self.targetType
// (eg if calling the base class method) then call the original base class method instead
// of the target method.
IntPtr superType = IntPtr.Zero;
if (Runtime.PyObject_TYPE(target) != self.targetType)
{
var inst = GetManagedObject(target) as CLRObject;
if (inst?.inst is IPythonDerivedType)
{
var baseType = GetManagedObject(self.targetType) as ClassBase;
if (baseType != null)
{
string baseMethodName = "_" + baseType.type.Name + "__" + self.m.name;
IntPtr baseMethod = Runtime.PyObject_GetAttrString(target, baseMethodName);
if (baseMethod != IntPtr.Zero)
{
var baseSelf = GetManagedObject(baseMethod) as MethodBinding;
if (baseSelf != null)
{
self = baseSelf;
}
Runtime.XDecref(baseMethod);
}
else
{
Runtime.PyErr_Clear();
}
}
}
}
return self.m.Invoke(target, args, kw, self.info);
}
finally
{
foreach (IntPtr ptr in disposeList)
{
Runtime.XDecref(ptr);
}
}
}
/// <summary>
/// MethodBinding __hash__ implementation.
/// </summary>
public static IntPtr tp_hash(IntPtr ob)
{
var self = (MethodBinding)GetManagedObject(ob);
long x = 0;
long y = 0;
if (self.target != IntPtr.Zero)
{
x = Runtime.PyObject_Hash(self.target).ToInt64();
if (x == -1)
{
return new IntPtr(-1);
}
}
y = Runtime.PyObject_Hash(self.m.pyHandle).ToInt64();
if (y == -1)
{
return new IntPtr(-1);
}
x ^= y;
if (x == -1)
{
x = -1;
}
return new IntPtr(x);
}
/// <summary>
/// MethodBinding __repr__ implementation.
/// </summary>
public static IntPtr tp_repr(IntPtr ob)
{
var self = (MethodBinding)GetManagedObject(ob);
string type = self.target == IntPtr.Zero ? "unbound" : "bound";
string name = self.m.name;
return Runtime.PyString_FromString($"<{type} method '{name}'>");
}
/// <summary>
/// MethodBinding dealloc implementation.
/// </summary>
public new static void tp_dealloc(IntPtr ob)
{
var self = (MethodBinding)GetManagedObject(ob);
Runtime.XDecref(self.target);
Runtime.XDecref(self.targetType);
FinalizeObject(self);
}
}
internal class DelegateMethodBinding : ExtensionType
{
MethodInfo[] info;
Type _boundType;
IntPtr _target; // FIXME: Use finalizer branch for releasing target
Dictionary<Type[], DelegateBoundMethodObject> _genericCallers;
DelegateCallableObject _caller;
static Comparator _comaprator = new Comparator();
class Comparator : IEqualityComparer<Type[]>
{
public bool Equals(Type[] x, Type[] y)
{
if (x.Length != y.Length)
{
return false;
}
for (int i = 0; i < x.Length; i++)
{
if (x[i] != y[i])
{
return false;
}
}
return true;
}
public int GetHashCode(Type[] obj)
{
int hash = 0;
foreach (var item in obj)
{
hash ^= item.GetHashCode();
}
return hash;
}
}
public DelegateMethodBinding(Type type, IntPtr target, MethodInfo[] infos, DelegateCallableObject caller)
{
_target = target;
_boundType = type;
info = infos;
_caller = caller;
_genericCallers = new Dictionary<Type[], DelegateBoundMethodObject>(_comaprator);
}
/// <summary>
/// Implement binding of generic methods using the subscript syntax [].
/// </summary>
public static IntPtr mp_subscript(IntPtr tp, IntPtr idx)
{
var self = (DelegateMethodBinding)GetManagedObject(tp);
Debug.Assert(self.info.Length > 0);
Type[] types = Runtime.PythonArgsToTypeArray(idx);
if (types == null)
{
return Exceptions.RaiseTypeError("type(s) expected");
}
DelegateBoundMethodObject methodObj;
DelegateCallableObject caller;
if (self._genericCallers.TryGetValue(types, out methodObj))
{
if (methodObj.IsCallable())
{
Runtime.XIncref(methodObj.pyHandle);
return methodObj.pyHandle;
}
return RaiseMatchError();
}
caller = new DelegateCallableObject(self.info[0].Name);
var methods = MethodBinder.MatchParamertersMethods(self.info, types);
foreach (var mi in methods)
{
if (mi.IsStatic)
{
caller.AddStaticMethod(mi);
}
else
{
caller.AddMethod(self._boundType, mi);
}
}
methodObj = BoundMethodPool.NewBoundMethod(self._target, caller);
self._genericCallers.Add(types, methodObj);
if (methodObj.IsCallable())
{
Runtime.XIncref(methodObj.pyHandle);
return methodObj.pyHandle;
}
return RaiseMatchError();
}
private static IntPtr RaiseMatchError()
{
return Exceptions.RaiseTypeError("No match found for given type params");
}
public static IntPtr tp_call(IntPtr ob, IntPtr args, IntPtr kw)
{
var self = (DelegateMethodBinding)GetManagedObject(ob);
return self._caller.PyCall(self._target, args);
}
}
}