pythonnet/src/runtime/interop.cs at develop · danic/pythonnet · GitHub

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// ==========================================================================

// This software is subject to the provisions of the Zope Public License,

// Version 2.0 (ZPL). A copy of the ZPL should accompany this distribution.

// THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED

// WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

// WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS

// FOR A PARTICULAR PURPOSE.

// ==========================================================================

using System;

using System.Collections;

using System.Collections.Specialized;

using System.Runtime.InteropServices;

using System.Reflection;

using System.Text;

namespace Python.Runtime {

//=======================================================================

// 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.

//=======================================================================

[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() {}

}

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

internal class ObjectOffset {

static ObjectOffset() {

int size = IntPtr.Size;

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

#if (Py_DEBUG)

_ob_next = 0;

_ob_prev = 1 * size;

n = 2;

#endif

ob_refcnt = (n+0) * size;

ob_type = (n+1) * size;

ob_dict = (n+2) * size;

ob_data = (n+3) * size;

}

public static int magic(IntPtr ob) {

#if (PYTHON32 || PYTHON33 || PYTHON34 || PYTHON35)

if ((Runtime.PyObject_TypeCheck(ob, Exceptions.BaseException) ||

(Runtime.PyType_Check(ob) && Runtime.PyType_IsSubtype(ob, Exceptions.BaseException))))

{

return ExceptionOffset.ob_data;

}

#endif

return ob_data;

}

public static int DictOffset(IntPtr ob)

{

#if (PYTHON32 || PYTHON33 || PYTHON34 || PYTHON35)

if ((Runtime.PyObject_TypeCheck(ob, Exceptions.BaseException) ||

(Runtime.PyType_Check(ob) && Runtime.PyType_IsSubtype(ob, Exceptions.BaseException))))

{

return ExceptionOffset.ob_dict;

}

#endif

return ob_dict;

}

public static int Size(IntPtr ob) {

#if (PYTHON32 || PYTHON33 || PYTHON34 || PYTHON35)

if ((Runtime.PyObject_TypeCheck(ob, Exceptions.BaseException) ||

(Runtime.PyType_Check(ob) && Runtime.PyType_IsSubtype(ob, Exceptions.BaseException))))

{

return ExceptionOffset.Size();

}

#endif

#if (Py_DEBUG)

return 6 * IntPtr.Size;

#else

return 4 * IntPtr.Size;

#endif

}

#if (Py_DEBUG)

public static int _ob_next;

public static int _ob_prev;

#endif

public static int ob_refcnt;

public static int ob_type;

private static int ob_dict;

private static int ob_data;

}

#if (PYTHON32 || PYTHON33 || PYTHON34 || PYTHON35)

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

internal class ExceptionOffset

{

static ExceptionOffset()

{

Type type = typeof(ExceptionOffset);

FieldInfo[] fi = type.GetFields();

int size = IntPtr.Size;

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

{

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

}

public static int Size()

{

return ob_data + IntPtr.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;

// extra c# data

public static int ob_dict;

public static int ob_data;

}

#endif

#if (PYTHON32 || PYTHON33 || PYTHON34 || PYTHON35)

[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 (Py_DEBUG) // #ifdef Py_TRACE_REFS

/* _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;

}

#endif // PYTHON3

/// <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 {

#if (PYTHON23 || PYTHON24 || PYTHON25 || PYTHON26 || PYTHON27)

// these flags were removed in Python 3

public static int HaveGetCharBuffer = (1 << 0);

public static int HaveSequenceIn = (1 << 1);

public static int GC = 0;

public static int HaveInPlaceOps = (1 << 3);

public static int CheckTypes = (1 << 4);

public static int HaveRichCompare = (1 << 5);

public static int HaveWeakRefs = (1 << 6);

public static int HaveIter = (1 << 7);

public static int HaveClass = (1 << 8);

#endif

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

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

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

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

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

// 15 and 16 are reserved for stackless

public static int HaveStacklessExtension = 0;

/* XXX Reusing reserved constants */

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

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

#if (PYTHON25 || PYTHON26 || PYTHON27 || PYTHON32 || PYTHON33 || PYTHON34 || PYTHON35)

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

#endif

#if (PYTHON26 || PYTHON27 || PYTHON32 || PYTHON33 || PYTHON34 || PYTHON35)

/* Objects support nb_index in PyNumberMethods */

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

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

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

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

// TODO: Implement FastSubclass functions

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

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

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

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

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

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

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

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

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

#endif

// Default flags for Python 2

#if (PYTHON23 || PYTHON24 || PYTHON25 || PYTHON26 || PYTHON27)

public static int Default = (

HaveGetCharBuffer |

HaveSequenceIn |

HaveInPlaceOps |

HaveRichCompare |

HaveWeakRefs |

HaveIter |

HaveClass |

HaveStacklessExtension |

#if (PYTHON25 || PYTHON26 || PYTHON27)

HaveIndex |

#endif

0);

#endif

// Default flags for Python 3

#if (PYTHON32 || PYTHON33 || PYTHON34 || PYTHON35)

public static int Default = (

HaveStacklessExtension |

HaveVersionTag);

#endif

}

// 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 {

static ArrayList keepAlive;

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;

}

keepAlive = new ArrayList();

Marshal.AllocHGlobal(IntPtr.Size);

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"];

#if !(PYTHON32 || PYTHON33 || PYTHON34 || PYTHON35)

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

#endif

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"];

#if !(PYTHON32 || PYTHON33 || PYTHON34 || PYTHON35)

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

#endif

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"];

#if (PYTHON25 || PYTHON26 || PYTHON27 || PYTHON32 || PYTHON33 || PYTHON34 || PYTHON35)

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

#endif

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 IntPtr 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) {

IntPtr tmp = Marshal.AllocHGlobal(IntPtr.Size);

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

Thunk cb = new Thunk(d);

Marshal.StructureToPtr(cb, tmp, false);

IntPtr fp = Marshal.ReadIntPtr(tmp, 0);

Marshal.FreeHGlobal(tmp);

keepAlive.Add(d);

return fp;

}

return IntPtr.Zero;

}