pythonnet/src/runtime/interop.cs at master · sdpython/pythonnet · GitHub

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using System;

using System.Collections;

using System.Collections.Generic;

using System.Diagnostics;

using System.Runtime.InteropServices;

using System.Reflection;

using System.Text;

namespace Python.Runtime

{

/// <summary>

/// This file defines objects to support binary interop with the Python

/// runtime. Generally, the definitions here need to be kept up to date

/// when moving to new Python versions.

/// </summary>

[Serializable]

[AttributeUsage(AttributeTargets.All)]

public class DocStringAttribute : Attribute

{

public DocStringAttribute(string docStr)

{

DocString = docStr;

}

public string DocString

{

get { return docStr; }

set { docStr = value; }

}

private string docStr;

}

[Serializable]

[AttributeUsage(AttributeTargets.Method | AttributeTargets.Delegate)]

internal class PythonMethodAttribute : Attribute

{

public PythonMethodAttribute()

{

}

[Serializable]

[AttributeUsage(AttributeTargets.Method | AttributeTargets.Delegate)]

internal class ModuleFunctionAttribute : Attribute

{

public ModuleFunctionAttribute()

{

}

[Serializable]

[AttributeUsage(AttributeTargets.Method | AttributeTargets.Delegate)]

internal class ForbidPythonThreadsAttribute : Attribute

{

public ForbidPythonThreadsAttribute()

{

}

[Serializable]

[AttributeUsage(AttributeTargets.Property)]

internal class ModulePropertyAttribute : Attribute

{

public ModulePropertyAttribute()

{

}

internal static partial class TypeOffset

{

public static int magic() => ManagedDataOffsets.Magic;

}

internal static class ManagedDataOffsets

{

public static int Magic { get; internal set; }

public static readonly Dictionary<string, int> NameMapping = new Dictionary<string, int>();

static class DataOffsets

{

public static readonly int ob_data = 0;

public static readonly int ob_dict = 0;

static DataOffsets()

{

FieldInfo[] fields = typeof(DataOffsets).GetFields(BindingFlags.Static | BindingFlags.Public);

for (int i = 0; i < fields.Length; i++)

{

fields[i].SetValue(null, -(i * IntPtr.Size) - IntPtr.Size);

}

static ManagedDataOffsets()

{

NameMapping = TypeOffset.GetOffsets();

FieldInfo[] fields = typeof(DataOffsets).GetFields(BindingFlags.Static | BindingFlags.Public);

size = fields.Length * IntPtr.Size;

}

public static int GetSlotOffset(string name)

{

return NameMapping[name];

}

private static int BaseOffset(IntPtr type)

{

Debug.Assert(type != IntPtr.Zero);

int typeSize = Marshal.ReadInt32(type, TypeOffset.tp_basicsize);

Debug.Assert(typeSize > 0);

return typeSize;

}

public static int DataOffset(IntPtr type)

{

return BaseOffset(type) + DataOffsets.ob_data;

}

public static int DictOffset(IntPtr type)

{

return BaseOffset(type) + DataOffsets.ob_dict;

}

public static int ob_data => DataOffsets.ob_data;

public static int ob_dict => DataOffsets.ob_dict;

public static int Size { get { return size; } }

private static readonly int size;

}

internal static class OriginalObjectOffsets

{

static OriginalObjectOffsets()

{

int size = IntPtr.Size;

var n = 0; // Py_TRACE_REFS add two pointers to PyObject_HEAD

#if PYTHON_WITH_PYDEBUG

_ob_next = 0;

_ob_prev = 1 * size;

n = 2;

#endif

ob_refcnt = (n + 0) * size;

ob_type = (n + 1) * size;

}

public static int Size { get { return size; } }

private static readonly int size =

#if PYTHON_WITH_PYDEBUG

4 * IntPtr.Size;

#else

2 * IntPtr.Size;

#endif

#if PYTHON_WITH_PYDEBUG

public static int _ob_next;

public static int _ob_prev;

#endif

public static int ob_refcnt;

public static int ob_type;

}

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]

internal class ObjectOffset

{

static ObjectOffset()

{

#if PYTHON_WITH_PYDEBUG

_ob_next = OriginalObjectOffsets._ob_next;

_ob_prev = OriginalObjectOffsets._ob_prev;

#endif

ob_refcnt = OriginalObjectOffsets.ob_refcnt;

ob_type = OriginalObjectOffsets.ob_type;

size = OriginalObjectOffsets.Size + ManagedDataOffsets.Size;

}

public static int magic(IntPtr type)

{

return ManagedDataOffsets.DataOffset(type);

}

public static int TypeDictOffset(IntPtr type)

{

return ManagedDataOffsets.DictOffset(type);

}

public static int Size(IntPtr pyType)

{

if (IsException(pyType))

{

return ExceptionOffset.Size();

}

return size;

}

#if PYTHON_WITH_PYDEBUG

public static int _ob_next;

public static int _ob_prev;

#endif

public static int ob_refcnt;

public static int ob_type;

private static readonly int size;

private static bool IsException(IntPtr pyObject)

{

var type = Runtime.PyObject_TYPE(pyObject);

return Runtime.PyType_IsSameAsOrSubtype(type, ofType: Exceptions.BaseException)

|| Runtime.PyType_IsSameAsOrSubtype(type, ofType: Runtime.PyTypeType)

&& Runtime.PyType_IsSubtype(pyObject, Exceptions.BaseException);

}

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]

internal class ExceptionOffset

{

static ExceptionOffset()

{

Type type = typeof(ExceptionOffset);

FieldInfo[] fi = type.GetFields(BindingFlags.Static | BindingFlags.Public);

for (int i = 0; i < fi.Length; i++)

{

fi[i].SetValue(null, (i * IntPtr.Size) + OriginalObjectOffsets.Size);

}

size = fi.Length * IntPtr.Size + OriginalObjectOffsets.Size + ManagedDataOffsets.Size;

}

public static int Size() { return size; }

// PyException_HEAD

// (start after PyObject_HEAD)

public static int dict = 0;

public static int args = 0;

public static int traceback = 0;

public static int context = 0;

public static int cause = 0;

public static int suppress_context = 0;

private static readonly int size;

}

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]

internal class BytesOffset

{

static BytesOffset()

{

Type type = typeof(BytesOffset);

FieldInfo[] fi = type.GetFields();

int size = IntPtr.Size;

for (int i = 0; i < fi.Length; i++)

{

fi[i].SetValue(null, i * size);

}

/* The *real* layout of a type object when allocated on the heap */

//typedef struct _heaptypeobject {

#if PYTHON_WITH_PYDEBUG

/* _PyObject_HEAD_EXTRA defines pointers to support a doubly-linked list of all live heap objects. */

public static int _ob_next = 0;

public static int _ob_prev = 0;

#endif

// PyObject_VAR_HEAD {

// PyObject_HEAD {

public static int ob_refcnt = 0;

public static int ob_type = 0;

// }

public static int ob_size = 0; /* Number of items in _VAR_iable part */

// }

public static int ob_shash = 0;

public static int ob_sval = 0; /* start of data */

/* Invariants:

* ob_sval contains space for 'ob_size+1' elements.

* ob_sval[ob_size] == 0.

* ob_shash is the hash of the string or -1 if not computed yet.

//} PyBytesObject;

}

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]

internal class ModuleDefOffset

{

static ModuleDefOffset()

{

Type type = typeof(ModuleDefOffset);

FieldInfo[] fi = type.GetFields();

int size = IntPtr.Size;

for (int i = 0; i < fi.Length; i++)

{

fi[i].SetValue(null, (i * size) + TypeOffset.ob_size);

}

public static IntPtr AllocModuleDef(string modulename)

{

byte[] ascii = Encoding.ASCII.GetBytes(modulename);

int size = name + ascii.Length + 1;

IntPtr ptr = Marshal.AllocHGlobal(size);

for (int i = 0; i <= m_free; i += IntPtr.Size)

Marshal.WriteIntPtr(ptr, i, IntPtr.Zero);

Marshal.Copy(ascii, 0, (IntPtr)(ptr + name), ascii.Length);

Marshal.WriteIntPtr(ptr, m_name, (IntPtr)(ptr + name));

Marshal.WriteByte(ptr, name + ascii.Length, 0);

return ptr;

}

public static void FreeModuleDef(IntPtr ptr)

{

Marshal.FreeHGlobal(ptr);

}

// typedef struct PyModuleDef{

// typedef struct PyModuleDef_Base {

// starts after PyObject_HEAD (TypeOffset.ob_type + 1)

public static int m_init = 0;

public static int m_index = 0;

public static int m_copy = 0;

// } PyModuleDef_Base

public static int m_name = 0;

public static int m_doc = 0;

public static int m_size = 0;

public static int m_methods = 0;

public static int m_reload = 0;

public static int m_traverse = 0;

public static int m_clear = 0;

public static int m_free = 0;

// } PyModuleDef

public static int name = 0;

}

/// <summary>

/// TypeFlags(): The actual bit values for the Type Flags stored

/// in a class.

/// Note that the two values reserved for stackless have been put

/// to good use as PythonNet specific flags (Managed and Subclass)

/// </summary>

internal class TypeFlags

{

public const int HeapType = (1 << 9);

public const int BaseType = (1 << 10);

public const int Ready = (1 << 12);

public const int Readying = (1 << 13);

public const int HaveGC = (1 << 14);

// 15 and 16 are reserved for stackless

public const int HaveStacklessExtension = 0;

/* XXX Reusing reserved constants */

public const int Managed = (1 << 15); // PythonNet specific

public const int Subclass = (1 << 16); // PythonNet specific

public const int HaveIndex = (1 << 17);

/* Objects support nb_index in PyNumberMethods */

public const int HaveVersionTag = (1 << 18);

public const int ValidVersionTag = (1 << 19);

public const int IsAbstract = (1 << 20);

public const int HaveNewBuffer = (1 << 21);

// TODO: Implement FastSubclass functions

public const int IntSubclass = (1 << 23);

public const int LongSubclass = (1 << 24);

public const int ListSubclass = (1 << 25);

public const int TupleSubclass = (1 << 26);

public const int StringSubclass = (1 << 27);

public const int UnicodeSubclass = (1 << 28);

public const int DictSubclass = (1 << 29);

public const int BaseExceptionSubclass = (1 << 30);

public const int TypeSubclass = (1 << 31);

public const int Default = (

HaveStacklessExtension |

HaveVersionTag);

}

// This class defines the function prototypes (delegates) used for low

// level integration with the CPython runtime. It also provides name

// based lookup of the correct prototype for a particular Python type

// slot and utilities for generating method thunks for managed methods.

internal class Interop

{

private static Hashtable pmap;

static Interop()

{

// Here we build a mapping of PyTypeObject slot names to the

// appropriate prototype (delegate) type to use for the slot.

Type[] items = typeof(Interop).GetNestedTypes();

Hashtable p = new Hashtable();

for (int i = 0; i < items.Length; i++)

{

Type item = items[i];

p[item.Name] = item;

}

pmap = new Hashtable();

pmap["tp_dealloc"] = p["DestructorFunc"];

pmap["tp_print"] = p["PrintFunc"];

pmap["tp_getattr"] = p["BinaryFunc"];

pmap["tp_setattr"] = p["ObjObjArgFunc"];

pmap["tp_compare"] = p["ObjObjFunc"];

pmap["tp_repr"] = p["UnaryFunc"];

pmap["tp_hash"] = p["UnaryFunc"];

pmap["tp_call"] = p["TernaryFunc"];

pmap["tp_str"] = p["UnaryFunc"];

pmap["tp_getattro"] = p["BinaryFunc"];

pmap["tp_setattro"] = p["ObjObjArgFunc"];

pmap["tp_traverse"] = p["ObjObjArgFunc"];

pmap["tp_clear"] = p["InquiryFunc"];

pmap["tp_richcompare"] = p["RichCmpFunc"];

pmap["tp_iter"] = p["UnaryFunc"];

pmap["tp_iternext"] = p["UnaryFunc"];

pmap["tp_descr_get"] = p["TernaryFunc"];

pmap["tp_descr_set"] = p["ObjObjArgFunc"];

pmap["tp_init"] = p["ObjObjArgFunc"];

pmap["tp_alloc"] = p["IntArgFunc"];

pmap["tp_new"] = p["TernaryFunc"];

pmap["tp_free"] = p["DestructorFunc"];

pmap["tp_is_gc"] = p["InquiryFunc"];

pmap["nb_add"] = p["BinaryFunc"];

pmap["nb_subtract"] = p["BinaryFunc"];

pmap["nb_multiply"] = p["BinaryFunc"];

pmap["nb_remainder"] = p["BinaryFunc"];

pmap["nb_divmod"] = p["BinaryFunc"];

pmap["nb_power"] = p["TernaryFunc"];

pmap["nb_negative"] = p["UnaryFunc"];

pmap["nb_positive"] = p["UnaryFunc"];

pmap["nb_absolute"] = p["UnaryFunc"];

pmap["nb_nonzero"] = p["InquiryFunc"];

pmap["nb_invert"] = p["UnaryFunc"];

pmap["nb_lshift"] = p["BinaryFunc"];

pmap["nb_rshift"] = p["BinaryFunc"];

pmap["nb_and"] = p["BinaryFunc"];

pmap["nb_xor"] = p["BinaryFunc"];

pmap["nb_or"] = p["BinaryFunc"];

pmap["nb_coerce"] = p["ObjObjFunc"];

pmap["nb_int"] = p["UnaryFunc"];

pmap["nb_long"] = p["UnaryFunc"];

pmap["nb_float"] = p["UnaryFunc"];

pmap["nb_oct"] = p["UnaryFunc"];

pmap["nb_hex"] = p["UnaryFunc"];

pmap["nb_inplace_add"] = p["BinaryFunc"];

pmap["nb_inplace_subtract"] = p["BinaryFunc"];

pmap["nb_inplace_multiply"] = p["BinaryFunc"];

pmap["nb_inplace_remainder"] = p["BinaryFunc"];

pmap["nb_inplace_power"] = p["TernaryFunc"];

pmap["nb_inplace_lshift"] = p["BinaryFunc"];

pmap["nb_inplace_rshift"] = p["BinaryFunc"];

pmap["nb_inplace_and"] = p["BinaryFunc"];

pmap["nb_inplace_xor"] = p["BinaryFunc"];

pmap["nb_inplace_or"] = p["BinaryFunc"];

pmap["nb_floor_divide"] = p["BinaryFunc"];

pmap["nb_true_divide"] = p["BinaryFunc"];

pmap["nb_inplace_floor_divide"] = p["BinaryFunc"];

pmap["nb_inplace_true_divide"] = p["BinaryFunc"];

pmap["nb_index"] = p["UnaryFunc"];

pmap["sq_length"] = p["InquiryFunc"];

pmap["sq_concat"] = p["BinaryFunc"];

pmap["sq_repeat"] = p["IntArgFunc"];

pmap["sq_item"] = p["IntArgFunc"];

pmap["sq_slice"] = p["IntIntArgFunc"];

pmap["sq_ass_item"] = p["IntObjArgFunc"];

pmap["sq_ass_slice"] = p["IntIntObjArgFunc"];

pmap["sq_contains"] = p["ObjObjFunc"];

pmap["sq_inplace_concat"] = p["BinaryFunc"];

pmap["sq_inplace_repeat"] = p["IntArgFunc"];

pmap["mp_length"] = p["InquiryFunc"];

pmap["mp_subscript"] = p["BinaryFunc"];

pmap["mp_ass_subscript"] = p["ObjObjArgFunc"];

pmap["bf_getreadbuffer"] = p["IntObjArgFunc"];

pmap["bf_getwritebuffer"] = p["IntObjArgFunc"];

pmap["bf_getsegcount"] = p["ObjObjFunc"];

pmap["bf_getcharbuffer"] = p["IntObjArgFunc"];

}

internal static Type GetPrototype(string name)

{

return pmap[name] as Type;

}

internal static Dictionary<IntPtr, Delegate> allocatedThunks = new Dictionary<IntPtr, Delegate>();

internal static ThunkInfo GetThunk(MethodInfo method, string funcType = null)

{

Type dt;

if (funcType != null)

dt = typeof(Interop).GetNestedType(funcType) as Type;

else

dt = GetPrototype(method.Name);

if (dt == null)

{

return ThunkInfo.Empty;

}

Delegate d = Delegate.CreateDelegate(dt, method);

var info = new ThunkInfo(d);

allocatedThunks[info.Address] = d;

return info;

}