pythonnet/src/runtime/methodbinder.cs at master · Sdoof/pythonnet · GitHub

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using System;

using System.Collections;

using System.Reflection;

namespace Python.Runtime

{

/// <summary>

/// A MethodBinder encapsulates information about a (possibly overloaded)

/// managed method, and is responsible for selecting the right method given

/// a set of Python arguments. This is also used as a base class for the

/// ConstructorBinder, a minor variation used to invoke constructors.

/// </summary>

internal class MethodBinder

{

public ArrayList list;

public MethodBase[] methods;

public bool init = false;

public bool allow_threads = true;

internal MethodBinder()

{

list = new ArrayList();

}

internal MethodBinder(MethodInfo mi)

{

list = new ArrayList { mi };

}

public int Count

{

get { return list.Count; }

}

internal void AddMethod(MethodBase m)

{

list.Add(m);

}

/// <summary>

/// Given a sequence of MethodInfo and a sequence of types, return the

/// MethodInfo that matches the signature represented by those types.

/// </summary>

internal static MethodInfo MatchSignature(MethodInfo[] mi, Type[] tp)

{

if (tp == null)

{

return null;

}

int count = tp.Length;

foreach (MethodInfo t in mi)

{

ParameterInfo[] pi = t.GetParameters();

if (pi.Length != count)

{

continue;

}

for (var n = 0; n < pi.Length; n++)

{

if (tp[n] != pi[n].ParameterType)

{

break;

}

if (n == pi.Length - 1)

{

return t;

}

return null;

}

/// <summary>

/// Given a sequence of MethodInfo and a sequence of type parameters,

/// return the MethodInfo that represents the matching closed generic.

/// </summary>

internal static MethodInfo MatchParameters(MethodInfo[] mi, Type[] tp)

{

if (tp == null)

{

return null;

}

int count = tp.Length;

foreach (MethodInfo t in mi)

{

if (!t.IsGenericMethodDefinition)

{

continue;

}

Type[] args = t.GetGenericArguments();

if (args.Length != count)

{

continue;

}

return t.MakeGenericMethod(tp);

}

return null;

}

/// <summary>

/// Given a sequence of MethodInfo and two sequences of type parameters,

/// return the MethodInfo that matches the signature and the closed generic.

/// </summary>

internal static MethodInfo MatchSignatureAndParameters(MethodInfo[] mi, Type[] genericTp, Type[] sigTp)

{

if (genericTp == null || sigTp == null)

{

return null;

}

int genericCount = genericTp.Length;

int signatureCount = sigTp.Length;

foreach (MethodInfo t in mi)

{

if (!t.IsGenericMethodDefinition)

{

continue;

}

Type[] genericArgs = t.GetGenericArguments();

if (genericArgs.Length != genericCount)

{

continue;

}

ParameterInfo[] pi = t.GetParameters();

if (pi.Length != signatureCount)

{

continue;

}

for (var n = 0; n < pi.Length; n++)

{

if (sigTp[n] != pi[n].ParameterType)

{

break;

}

if (n == pi.Length - 1)

{

MethodInfo match = t;

if (match.IsGenericMethodDefinition)

{

// FIXME: typeArgs not used

Type[] typeArgs = match.GetGenericArguments();

return match.MakeGenericMethod(genericTp);

}

return match;

}

return null;

}

/// <summary>

/// Return the array of MethodInfo for this method. The result array

/// is arranged in order of precedence (done lazily to avoid doing it

/// at all for methods that are never called).

/// </summary>

internal MethodBase[] GetMethods()

{

if (!init)

{

// I'm sure this could be made more efficient.

list.Sort(new MethodSorter());

methods = (MethodBase[])list.ToArray(typeof(MethodBase));

init = true;

}

return methods;

}

/// <summary>

/// Precedence algorithm largely lifted from Jython - the concerns are

/// generally the same so we'll start with this and tweak as necessary.

/// </summary>

/// <remarks>

/// Based from Jython `org.python.core.ReflectedArgs.precedence`

/// See: https://github.com/jythontools/jython/blob/master/src/org/python/core/ReflectedArgs.java#L192

/// </remarks>

internal static int GetPrecedence(MethodBase mi)

{

ParameterInfo[] pi = mi.GetParameters();

int val = mi.IsStatic ? 3000 : 0;

int num = pi.Length;

val += mi.IsGenericMethod ? 1 : 0;

for (var i = 0; i < num; i++)

{

val += ArgPrecedence(pi[i].ParameterType);

}

return val;

}

/// <summary>

/// Return a precedence value for a particular Type object.

/// </summary>

internal static int ArgPrecedence(Type t)

{

Type objectType = typeof(object);

if (t == objectType)

{

return 3000;

}

TypeCode tc = Type.GetTypeCode(t);

// TODO: Clean up

switch (tc)

{

case TypeCode.Object:

return 1;

case TypeCode.UInt64:

return 10;

case TypeCode.UInt32:

return 11;

case TypeCode.UInt16:

return 12;

case TypeCode.Int64:

return 13;

case TypeCode.Int32:

return 14;

case TypeCode.Int16:

return 15;

case TypeCode.Char:

return 16;

case TypeCode.SByte:

return 17;

case TypeCode.Byte:

return 18;

case TypeCode.Single:

return 20;

case TypeCode.Double:

return 21;

case TypeCode.String:

return 30;

case TypeCode.Boolean:

return 40;

}

if (t.IsArray)

{

Type e = t.GetElementType();

if (e == objectType)

{

return 2500;

}

return 100 + ArgPrecedence(e);

}

return 2000;

}

/// <summary>

/// Bind the given Python instance and arguments to a particular method

/// overload and return a structure that contains the converted Python

/// instance, converted arguments and the correct method to call.

/// </summary>

internal Binding Bind(IntPtr inst, IntPtr args, IntPtr kw)

{

return Bind(inst, args, kw, null, null);

}

internal Binding Bind(IntPtr inst, IntPtr args, IntPtr kw, MethodBase info)

{

return Bind(inst, args, kw, info, null);

}

internal Binding Bind(IntPtr inst, IntPtr args, IntPtr kw, MethodBase info, MethodInfo[] methodinfo)

{

// loop to find match, return invoker w/ or /wo error

MethodBase[] _methods = null;

int pynargs = Runtime.PyTuple_Size(args);

object arg;

var isGeneric = false;

ArrayList defaultArgList = null;

if (info != null)

{

_methods = new MethodBase[1];

_methods.SetValue(info, 0);

}

else

{

_methods = GetMethods();

}

Type clrtype;

// TODO: Clean up

foreach (MethodBase mi in _methods)

{

if (mi.IsGenericMethod)

{

isGeneric = true;

}

ParameterInfo[] pi = mi.GetParameters();

int clrnargs = pi.Length;

var match = false;

int arrayStart = -1;

var outs = 0;

if (pynargs == clrnargs)

{

match = true;

}

else if (pynargs < clrnargs)

{

match = true;

defaultArgList = new ArrayList();

for (int v = pynargs; v < clrnargs; v++)

{

if (pi[v].DefaultValue == DBNull.Value)

{

match = false;

}

else

{

defaultArgList.Add(pi[v].DefaultValue);

}

else if (pynargs > clrnargs && clrnargs > 0 &&

Attribute.IsDefined(pi[clrnargs - 1], typeof(ParamArrayAttribute)))

{

// This is a `foo(params object[] bar)` style method

match = true;

arrayStart = clrnargs - 1;

}

if (match)

{

var margs = new object[clrnargs];

for (var n = 0; n < clrnargs; n++)

{

IntPtr op;

if (n < pynargs)

{

if (arrayStart == n)

{

// map remaining Python arguments to a tuple since

// the managed function accepts it - hopefully :]

op = Runtime.PyTuple_GetSlice(args, arrayStart, pynargs);

}

else

{

op = Runtime.PyTuple_GetItem(args, n);

}

// this logic below handles cases when multiple overloading methods

// are ambiguous, hence comparison between Python and CLR types

// is necessary

clrtype = null;

IntPtr pyoptype;

if (_methods.Length > 1)

{

pyoptype = IntPtr.Zero;

pyoptype = Runtime.PyObject_Type(op);

Exceptions.Clear();

if (pyoptype != IntPtr.Zero)

{

clrtype = Converter.GetTypeByAlias(pyoptype);

}

Runtime.XDecref(pyoptype);

}

if (clrtype != null)

{

var typematch = false;

if ((pi[n].ParameterType != typeof(object)) && (pi[n].ParameterType != clrtype))

{

IntPtr pytype = Converter.GetPythonTypeByAlias(pi[n].ParameterType);

pyoptype = Runtime.PyObject_Type(op);

Exceptions.Clear();

if (pyoptype != IntPtr.Zero)

{

if (pytype != pyoptype)

{

typematch = false;

}

else

{

typematch = true;

clrtype = pi[n].ParameterType;

}

if (!typematch)

{

// this takes care of nullables

var underlyingType = Nullable.GetUnderlyingType(pi[n].ParameterType);

if (underlyingType == null)

{

underlyingType = pi[n].ParameterType;

}

// this takes care of enum values

TypeCode argtypecode = Type.GetTypeCode(underlyingType);

TypeCode paramtypecode = Type.GetTypeCode(clrtype);

if (argtypecode == paramtypecode)

{

typematch = true;

clrtype = pi[n].ParameterType;

}

// this takes care of implicit conversions

var opImplicit = pi[n].ParameterType.GetMethod("op_Implicit", new[] { clrtype });

if (opImplicit != null)

{

typematch = opImplicit.ReturnType == pi[n].ParameterType;

clrtype = pi[n].ParameterType;

}

Runtime.XDecref(pyoptype);

if (!typematch)

{

margs = null;

break;

}

else

{

typematch = true;

clrtype = pi[n].ParameterType;

}

else

{

clrtype = pi[n].ParameterType;

}

if (pi[n].IsOut || clrtype.IsByRef)

{

outs++;

}

if (!Converter.ToManaged(op, clrtype, out arg, false))

{

Exceptions.Clear();

margs = null;

break;

}

if (arrayStart == n)

{

// GetSlice() creates a new reference but GetItem()

// returns only a borrow reference.

Runtime.XDecref(op);

}

margs[n] = arg;

}

else

{

if (defaultArgList != null)

{

margs[n] = defaultArgList[n - pynargs];

}

if (margs == null)

{

continue;

}

object target = null;

if (!mi.IsStatic && inst != IntPtr.Zero)

{

//CLRObject co = (CLRObject)ManagedType.GetManagedObject(inst);

// InvalidCastException: Unable to cast object of type

// 'Python.Runtime.ClassObject' to type 'Python.Runtime.CLRObject'

var co = ManagedType.GetManagedObject(inst) as CLRObject;

// Sanity check: this ensures a graceful exit if someone does

// something intentionally wrong like call a non-static method

// on the class rather than on an instance of the class.

// XXX maybe better to do this before all the other rigmarole.

if (co == null)

{

return null;

}

target = co.inst;

}

return new Binding(mi, target, margs, outs);

}

// We weren't able to find a matching method but at least one

// is a generic method and info is null. That happens when a generic

// method was not called using the [] syntax. Let's introspect the

// type of the arguments and use it to construct the correct method.

if (isGeneric && info == null && methodinfo != null)

{

Type[] types = Runtime.PythonArgsToTypeArray(args, true);

MethodInfo mi = MatchParameters(methodinfo, types);

return Bind(inst, args, kw, mi, null);

}

return null;

}

internal virtual IntPtr Invoke(IntPtr inst, IntPtr args, IntPtr kw)

{

return Invoke(inst, args, kw, null, null);

}

internal virtual IntPtr Invoke(IntPtr inst, IntPtr args, IntPtr kw, MethodBase info)

{

return Invoke(inst, args, kw, info, null);

}

internal virtual IntPtr Invoke(IntPtr inst, IntPtr args, IntPtr kw, MethodBase info, MethodInfo[] methodinfo)

{

Binding binding = Bind(inst, args, kw, info, methodinfo);

object result;

IntPtr ts = IntPtr.Zero;

if (binding == null)

{

Exceptions.SetError(Exceptions.TypeError, "No method matches given arguments for " + methodinfo[0].Name);

return IntPtr.Zero;

}

if (allow_threads)

{

ts = PythonEngine.BeginAllowThreads();

}

try

{

result = binding.info.Invoke(binding.inst, BindingFlags.Default, null, binding.args, null);

}

catch (Exception e)

{

if (e.InnerException != null)

{

e = e.InnerException;

}

if (allow_threads)

{

PythonEngine.EndAllowThreads(ts);

}

Exceptions.SetError(e);

return IntPtr.Zero;

}

if (allow_threads)

{

PythonEngine.EndAllowThreads(ts);

}

// If there are out parameters, we return a tuple containing

// the result followed by the out parameters. If there is only

// one out parameter and the return type of the method is void,

// we return the out parameter as the result to Python (for

// code compatibility with ironpython).

var mi = (MethodInfo)binding.info;

if (binding.outs == 1 && mi.ReturnType == typeof(void))

{

}

if (binding.outs > 0)

{

ParameterInfo[] pi = mi.GetParameters();

int c = pi.Length;

var n = 0;

IntPtr t = Runtime.PyTuple_New(binding.outs + 1);

IntPtr v = Converter.ToPython(result, mi.ReturnType);

Runtime.PyTuple_SetItem(t, n, v);

n++;

for (var i = 0; i < c; i++)

{

Type pt = pi[i].ParameterType;

if (pi[i].IsOut || pt.IsByRef)

{

v = Converter.ToPython(binding.args[i], pt);

Runtime.PyTuple_SetItem(t, n, v);

n++;

}

if (binding.outs == 1 && mi.ReturnType == typeof(void))

{

v = Runtime.PyTuple_GetItem(t, 1);

Runtime.XIncref(v);

Runtime.XDecref(t);

return v;

}

return t;

}

return Converter.ToPython(result, mi.ReturnType);

}

/// <summary>

/// Utility class to sort method info by parameter type precedence.

/// </summary>

internal class MethodSorter : IComparer

{

int IComparer.Compare(object m1, object m2)

{

int p1 = MethodBinder.GetPrecedence((MethodBase)m1);

int p2 = MethodBinder.GetPrecedence((MethodBase)m2);

if (p1 < p2)

{

return -1;

}

if (p1 > p2)

{

return 1;

}

return 0;

}

/// <summary>

/// A Binding is a utility instance that bundles together a MethodInfo

/// representing a method to call, a (possibly null) target instance for

/// the call, and the arguments for the call (all as managed values).

/// </summary>

internal class Binding

{

public MethodBase info;

public object[] args;

public object inst;

public int outs;

internal Binding(MethodBase info, object inst, object[] args, int outs)

{

this.info = info;

this.inst = inst;

this.args = args;

this.outs = outs;

}

pythonnet/src/runtime/methodbinder.cs at master · Sdoof/pythonnet · GitHub

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