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Diffstat (limited to 'sources/shiboken2/libshiboken/pep384impl.cpp')
| -rw-r--r-- | sources/shiboken2/libshiboken/pep384impl.cpp | 924 |
1 files changed, 924 insertions, 0 deletions
diff --git a/sources/shiboken2/libshiboken/pep384impl.cpp b/sources/shiboken2/libshiboken/pep384impl.cpp new file mode 100644 index 000000000..2707d3716 --- /dev/null +++ b/sources/shiboken2/libshiboken/pep384impl.cpp @@ -0,0 +1,924 @@ +/**************************************************************************** +** +** Copyright (C) 2018 The Qt Company Ltd. +** Contact: https://www.qt.io/licensing/ +** +** This file is part of Qt for Python. +** +** $QT_BEGIN_LICENSE:LGPL$ +** Commercial License Usage +** Licensees holding valid commercial Qt licenses may use this file in +** accordance with the commercial license agreement provided with the +** Software or, alternatively, in accordance with the terms contained in +** a written agreement between you and The Qt Company. For licensing terms +** and conditions see https://www.qt.io/terms-conditions. For further +** information use the contact form at https://www.qt.io/contact-us. +** +** GNU Lesser General Public License Usage +** Alternatively, this file may be used under the terms of the GNU Lesser +** General Public License version 3 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL3 included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 3 requirements +** will be met: https://www.gnu.org/licenses/lgpl-3.0.html. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU +** General Public License version 2.0 or (at your option) the GNU General +** Public license version 3 or any later version approved by the KDE Free +** Qt Foundation. The licenses are as published by the Free Software +** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3 +** included in the packaging of this file. Please review the following +** information to ensure the GNU General Public License requirements will +** be met: https://www.gnu.org/licenses/gpl-2.0.html and +** https://www.gnu.org/licenses/gpl-3.0.html. +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "pep384impl.h" + +extern "C" +{ + +/********************************************************************** + ********************************************************************** + + + The New Type API + ================ + + After converting everything but the "object.h" file, we could not + believe our eyes: it suddenly was clear that we would have no more + access to type objects, and even more scary that all types which we + use have to be heap types, only! + + For PySide with it's intense use of heap type extensions in various + flavors, it seemed to be quite unsolvable. In the end, it was + nicely solved, but it took almost 3.5 months to get that right. + + Before we see how this is done, we will explain the differences + between the APIs and their consequences. + + + The Interface + ------------- + + The old type API of Python knows static types and heap types. + Static types are written down as a declaration of a PyTypeObject + structure with all its fields filled in. Here is for example + the definition of the Python type "object": + + PyTypeObject PyBaseObject_Type = { + PyVarObject_HEAD_INIT(&PyType_Type, 0) + "object", |* tp_name *| + sizeof(PyObject), |* tp_basicsize *| + 0, |* tp_itemsize *| + object_dealloc, |* tp_dealloc *| + 0, |* tp_print *| + 0, |* tp_getattr *| + 0, |* tp_setattr *| + 0, |* tp_reserved *| + object_repr, |* tp_repr *| + 0, |* tp_as_number *| + 0, |* tp_as_sequence *| + 0, |* tp_as_mapping *| + (hashfunc)_Py_HashPointer, |* tp_hash *| + 0, |* tp_call *| + object_str, |* tp_str *| + PyObject_GenericGetAttr, |* tp_getattro *| + PyObject_GenericSetAttr, |* tp_setattro *| + 0, |* tp_as_buffer *| + Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, |* tp_flags *| + PyDoc_STR("object()\n--\n\nThe most base type"), |* tp_doc *| + 0, |* tp_traverse *| + 0, |* tp_clear *| + object_richcompare, |* tp_richcompare *| + 0, |* tp_weaklistoffset *| + 0, |* tp_iter *| + 0, |* tp_iternext *| + object_methods, |* tp_methods *| + 0, |* tp_members *| + object_getsets, |* tp_getset *| + 0, |* tp_base *| + 0, |* tp_dict *| + 0, |* tp_descr_get *| + 0, |* tp_descr_set *| + 0, |* tp_dictoffset *| + object_init, |* tp_init *| + PyType_GenericAlloc, |* tp_alloc *| + object_new, |* tp_new *| + PyObject_Del, |* tp_free *| + }; + + We can write the same structure in form of a PyType_Spec structure, + and there is even a tool that does this for us, but I had to fix a + few things because there is little support for this. + + The tool is XXX go home and continue..... + + + + + The Transition To Simpler Types + =============================== + + After all code has been converted to the limited API, there is the + PyHeapTypeObject remaining as a problem. + + Why a problem? Well, all the type structures in shiboken use + special extra fields at the end of the heap type object. This + currently enforces knowledge at compile time about how large the + heap type object is. In a clean implementation, we would only use + the PyTypeObject itself and access the fields "behind" the type + by a pointer that is computed at runtime. + + + Excursion: PepTypeObject + ------------------------ + + Before we are going into details, let us motivate the existence of + the PepTypeObject, an alias to PyTypeObject: + + Originally, we wanted to use PyTypeObject as an opaque type and + restrict ourselves to only use the access function PyType_GetSlot. + This function allows access to all fields which are supported by + the limited API. + + But this is a restriction, because we get no access to tp_dict, + which we need to support the signature extension. But we can work + around that. + + The real restriction is that PyType_GetSlot only works for heap + types. This makes the function quite useless, because we have + no access to PyType_Type, which is the most important type "type" + in Python. We need that for instance to compute the size of + PyHeapTypeObject dynamically. + + With much effort, it is possible to clone PyType_Type as a heap + type. But due to a bug in the Pep 384 support, we need + access to the nb_index field of a normal type. Cloning does not + help because PyNumberMethods fields are not inherited. + + After I realized this dead end, I changed the concept and did not + use PyType_GetSlot at all (except in function copyNumberMethods), + but created PepTypeObject as a remake of PyTypeObject with only + those fields defined that are needed in PySide. + + Is this breakage of the limited API? I don't think so. A special + function runs on program startup that checks the correct position + of the fields of PepHeapType, although a change in those fields is + more than unlikely. + The really crucial thing is to no longer use PyHeapTypeObject + explicitly because that _does_ change its layout over time. + + + Diversification + --------------- + + There are multiple SbkXXX structures which all use a "d" field + for their private data. This makes it not easy to find the right + fields when switching between types and objects. + + struct LIBSHIBOKEN_API SbkObjectType + { + PyHeapTypeObject super; + SbkObjectTypePrivate *d; + }; + + struct LIBSHIBOKEN_API SbkObject + { + PyObject_HEAD + PyObject* ob_dict; + PyObject* weakreflist; + SbkObjectPrivate* d; + }; + + The first step was to rename the SbkObjectTypePrivate from "d" to + "sotp". It was chosen to be short but easy to remember. + + + Abstraction + ----------- + + After renaming the type extension pointers to "sotp", I replaced + them by function-like macros which did the special access "behind" + the types, instead of those explicit fields. For instance, the + expression + + type->sotp->converter + + became + + PepType_SOTP(type)->converter + + The macro expression can be seen here: + + #define _genericTypeExtender(etype) \ + (reinterpret_cast<char*>(etype) + \ + (reinterpret_cast<PepTypeObject*>(&PyType_Type))->tp_basicsize) + + #define PepType_SOTP(etype) \ + (*reinterpret_cast<SbkObjectTypePrivate**>(_genericTypeExtender(etype))) + + It looks complicated, but in the end there is only a single new + indirection via PyType_Type, which happens at runtime. This is the + key to fulfil what Pep 384 wants: No version-dependent fields. + + + Simplification + -------------- + + After all type extension fields were replaced by macro calls, we + could remove the version dependent definition + + typedef struct _pepheaptypeobject { + union { + PepTypeObject ht_type; + void *opaque[PY_HEAPTYPE_SIZE]; + }; + } PepHeapTypeObject; + + and the version dependent structure + + struct LIBSHIBOKEN_API SbkObjectType + { + PepHeapTypeObject super; + SbkObjectTypePrivate *sotp; + }; + + could be replaced by the simplified + + struct LIBSHIBOKEN_API SbkObjectType + { + PepTypeObject type; + }; + + which is no longer version-dependent. + + + Verification Of PepTypeObject + ============================= + + We have introduced PepTypeObject as a new alias for PyTypeObject, + and now we need to prove that we are allowed to do so. + + When using the limited API as intended, then types are completely + opaque, and access is only through PyType_FromSpec and (from + version 3.5 upwards) through PyType_GetSlot. + + Python then uses all the slot definitions in the type description + and produces a regular type object. + + + Unused Information + ------------------ + + But we know many things about types that are not explicitly said, + but they are inherently clear: + + a) The basic structure of a type is always the same, regardless + if it is a static type or a heap type. + + b) types are evolving very slowly, and a field is never replaced + by another field with different semantics. + + Inherent rule a) gives us the following information: If we calculate + the offsets of the fields, then this info is also usable for non- + -heap types. + + The validation checks if rule b) is still valid. + + + How it Works + ------------ + + The basic idea of the validation is to produce a new type using + PyType_FromSpec and to see where in the type structure these fields + show up. So we build a PyType_Slot structure with all the fields we + are using and make sure that these values are all unique in the + type. + + Most fields are not investigated by PyType_FromSpec, and so we + simply used some numeric value. Some fields are interpreted, like + tp_members. This field must really be a PyMemberDef. And there are + tp_base and tp_bases which have to be type objects and lists + thereof. It was easiest to not produce these fields from scratch + but use them from the "type" object PyType_Type. + + Then one would think to write a function that searches the known + values in the opaque type structure. + + But we can do better and use optimistically the observation (b): + We simply use the PepTypeObject structure and assume that every + field lands exactly where we are awaiting it. + + And that is the whole proof: If we find all the disjoint values at + the places where we expect them, thenthis is q.e.d. :) + + + About tp_dict + ------------- + + One word about the tp_dict field: This field is a bit special in + the proof, since it does not appear in the spec and cannot easily + be checked by "type.__dict__" because that creates a dictproxy + object. So how do we proove that is really the right dict? + + We have to create that PyMethodDef structure anyway, and instead of + leaving it empty, we insert a dummy function. Then we ask the + tp_dict field if it has that object in it, and that's q.e.d. + + + *********/ + + +/***************************************************************************** + * + * Support for object.h + * + */ + +/* + * Here is the verification code for PepTypeObject. + * We create a type object and check if its fields + * appear at the right offsets. + */ + +#define make_dummy_int(x) (x * sizeof(void*)) +#define make_dummy(x) (reinterpret_cast<void*>(make_dummy_int(x))) + +#ifdef Py_LIMITED_API +datetime_struc *PyDateTimeAPI = NULL; +#endif + +static PyObject * +dummy_func(PyObject *self, PyObject *args) +{ + Py_RETURN_NONE; +} + +static struct PyMethodDef probe_methoddef[] = { + {"dummy", dummy_func, METH_NOARGS}, + {0} +}; + +#define probe_tp_call make_dummy(1) +#define probe_tp_str make_dummy(2) +#define probe_tp_traverse make_dummy(3) +#define probe_tp_clear make_dummy(4) +#define probe_tp_methods probe_methoddef +#define probe_tp_descr_get make_dummy(6) +#define probe_tp_init make_dummy(7) +#define probe_tp_alloc make_dummy(8) +#define probe_tp_new make_dummy(9) +#define probe_tp_free make_dummy(10) +#define probe_tp_is_gc make_dummy(11) + +#define probe_tp_name "type.probe" +#define probe_tp_basicsize make_dummy_int(42) + +static PyType_Slot typeprobe_slots[] = { + {Py_tp_call, probe_tp_call}, + {Py_tp_str, probe_tp_str}, + {Py_tp_traverse, probe_tp_traverse}, + {Py_tp_clear, probe_tp_clear}, + {Py_tp_methods, probe_tp_methods}, + {Py_tp_descr_get, probe_tp_descr_get}, + {Py_tp_init, probe_tp_init}, + {Py_tp_alloc, probe_tp_alloc}, + {Py_tp_new, probe_tp_new}, + {Py_tp_free, probe_tp_free}, + {Py_tp_is_gc, probe_tp_is_gc}, + {0, 0} +}; +static PyType_Spec typeprobe_spec = { + probe_tp_name, + probe_tp_basicsize, + 0, + Py_TPFLAGS_DEFAULT, + typeprobe_slots, +}; + +static void +check_PepTypeObject_valid(void) +{ + PyObject *obtype = reinterpret_cast<PyObject*>(&PyType_Type); + PyTypeObject *probe_tp_base = reinterpret_cast<PyTypeObject*>( + PyObject_GetAttrString(obtype, "__base__")); + PyObject *probe_tp_bases = PyObject_GetAttrString(obtype, "__bases__"); + PepTypeObject *check = reinterpret_cast<PepTypeObject*>( + PyType_FromSpecWithBases(&typeprobe_spec, probe_tp_bases)); + PepTypeObject *typetype = reinterpret_cast<PepTypeObject*>(obtype); + PyObject *w = PyObject_GetAttrString(obtype, "__weakrefoffset__"); + long probe_tp_weakrefoffset = PyLong_AsLong(w); + PyObject *d = PyObject_GetAttrString(obtype, "__dictoffset__"); + long probe_tp_dictoffset = PyLong_AsLong(d); + PyObject *probe_tp_mro = PyObject_GetAttrString(obtype, "__mro__"); + if (false + || probe_tp_name != check->tp_name + || probe_tp_basicsize != check->tp_basicsize + || probe_tp_call != check->tp_call + || probe_tp_str != check->tp_str + || probe_tp_traverse != check->tp_traverse + || probe_tp_clear != check->tp_clear + || probe_tp_weakrefoffset != typetype->tp_weaklistoffset + || probe_tp_methods != check->tp_methods + || probe_tp_base != typetype->tp_base + || !PyDict_Check(check->tp_dict) + || !PyDict_GetItemString(check->tp_dict, "dummy") + || probe_tp_descr_get != check->tp_descr_get + || probe_tp_dictoffset != typetype->tp_dictoffset + || probe_tp_init != check->tp_init + || probe_tp_alloc != check->tp_alloc + || probe_tp_new != check->tp_new + || probe_tp_free != check->tp_free + || probe_tp_is_gc != check->tp_is_gc + || probe_tp_bases != typetype->tp_bases + || probe_tp_mro != typetype->tp_mro) + Py_FatalError("The structure of type objects has changed!"); + Py_DECREF(check); + Py_DECREF(probe_tp_base); + Py_DECREF(w); + Py_DECREF(d); + Py_DECREF(probe_tp_bases); + Py_DECREF(probe_tp_mro); +} + + +#ifdef Py_LIMITED_API + +// This structure is only here because Python 3 has an error. +// I will fix that. + +typedef struct { + /* Number implementations must check *both* + arguments for proper type and implement the necessary conversions + in the slot functions themselves. */ + + binaryfunc nb_add; + binaryfunc nb_subtract; + binaryfunc nb_multiply; + binaryfunc nb_remainder; + binaryfunc nb_divmod; + ternaryfunc nb_power; + unaryfunc nb_negative; + unaryfunc nb_positive; + unaryfunc nb_absolute; + inquiry nb_bool; + unaryfunc nb_invert; + binaryfunc nb_lshift; + binaryfunc nb_rshift; + binaryfunc nb_and; + binaryfunc nb_xor; + binaryfunc nb_or; + unaryfunc nb_int; + void *nb_reserved; /* the slot formerly known as nb_long */ + unaryfunc nb_float; + + binaryfunc nb_inplace_add; + binaryfunc nb_inplace_subtract; + binaryfunc nb_inplace_multiply; + binaryfunc nb_inplace_remainder; + ternaryfunc nb_inplace_power; + binaryfunc nb_inplace_lshift; + binaryfunc nb_inplace_rshift; + binaryfunc nb_inplace_and; + binaryfunc nb_inplace_xor; + binaryfunc nb_inplace_or; + + binaryfunc nb_floor_divide; + binaryfunc nb_true_divide; + binaryfunc nb_inplace_floor_divide; + binaryfunc nb_inplace_true_divide; + + unaryfunc nb_index; + + binaryfunc nb_matrix_multiply; + binaryfunc nb_inplace_matrix_multiply; +} PyNumberMethods; + +// temporary structure until we have a generator for the offsets +typedef struct _oldtypeobject { + PyVarObject ob_base; + void *X01; // const char *tp_name; + void *X02; // Py_ssize_t tp_basicsize; + void *X03; // Py_ssize_t tp_itemsize; + void *X04; // destructor tp_dealloc; + void *X05; // printfunc tp_print; + void *X06; // getattrfunc tp_getattr; + void *X07; // setattrfunc tp_setattr; + void *X08; // PyAsyncMethods *tp_as_async; + void *X09; // reprfunc tp_repr; + PyNumberMethods *tp_as_number; + +} PyOldTypeObject; + +// There is a bug in Python 3.6 that turned the Index_Check function +// into a macro without taking care of the limited API. +// This leads to the single problem that we don't have +// access to PyLong_Type's nb_index field which is no heap type. +// We cannot easily create this function by inheritance since it is +// not inherited. +// +// Simple solution: Create the structure and write such a function. +// Long term: Submit a patch to python.org . + +unaryfunc +PepType_nb_index(PyTypeObject *type) +{ + return reinterpret_cast<PyOldTypeObject*>(type)->tp_as_number->nb_index; +} + +int PyIndex_Check(PyObject *obj) +{ + PyOldTypeObject *type = reinterpret_cast<PyOldTypeObject*>(Py_TYPE(obj)); + return type->tp_as_number != NULL && + type->tp_as_number->nb_index != NULL; +} + +/***************************************************************************** + * + * Support for unicodeobject.h + * + */ + +char * +_PepUnicode_AsString(PyObject *str) +{ + /* + * We need to keep the string alive but cannot borrow the Python object. + * Ugly easy way out: We re-code as an interned bytes string. This + * produces a pseudo-leak as long there are new strings. + * Typically, this function is used for name strings, and the dict size + * will not grow so much. + */ +#define STRINGIFY(x) #x +#define TOSTRING(x) STRINGIFY(x) +#define AT __FILE__ ":" TOSTRING(__LINE__) + + static PyObject *cstring_dict = NULL; + if (cstring_dict == NULL) { + cstring_dict = PyDict_New(); + if (cstring_dict == NULL) + Py_FatalError("Error in " AT); + } + PyObject *bytesStr = PyUnicode_AsEncodedString(str, "utf8", NULL); + PyObject *entry = PyDict_GetItem(cstring_dict, bytesStr); + if (entry == NULL) { + int e = PyDict_SetItem(cstring_dict, bytesStr, bytesStr); + if (e != 0) + Py_FatalError("Error in " AT); + entry = bytesStr; + } + else + Py_DECREF(bytesStr); + return PyBytes_AsString(entry); +} + +/***************************************************************************** + * + * Support for longobject.h + * + */ + +/* + * This is the original Python function _PyLong_AsInt() from longobject.c . + * We define it here because we are not allowed to use the function + * from Python with an underscore. + */ + +/* Get a C int from an int object or any object that has an __int__ + method. Return -1 and set an error if overflow occurs. */ + +int +_PepLong_AsInt(PyObject *obj) +{ + int overflow; + long result = PyLong_AsLongAndOverflow(obj, &overflow); + if (overflow || result > INT_MAX || result < INT_MIN) { + /* XXX: could be cute and give a different + message for overflow == -1 */ + PyErr_SetString(PyExc_OverflowError, + "Python int too large to convert to C int"); + return -1; + } + return (int)result; +} + +/***************************************************************************** + * + * Support for pydebug.h + * + */ +static PyObject *sys_flags = NULL; + +int +Pep_GetFlag(const char *name) +{ + static int initialized = 0; + int ret = -1; + + if (!initialized) { + sys_flags = PySys_GetObject("flags"); + // func gives no error if NULL is returned and does not incref. + Py_XINCREF(sys_flags); + initialized = 1; + } + if (sys_flags != NULL) { + PyObject *ob_ret = PyObject_GetAttrString(sys_flags, name); + if (ob_ret != NULL) { + long long_ret = PyLong_AsLong(ob_ret); + Py_DECREF(ob_ret); + ret = (int) long_ret; + } + } + return ret; +} + +int +Pep_GetVerboseFlag() +{ + static int initialized = 0; + static int verbose_flag = -1; + + if (!initialized) { + verbose_flag = Pep_GetFlag("verbose"); + if (verbose_flag != -1) + initialized = 1; + } + return verbose_flag; +} + +/***************************************************************************** + * + * Support for code.h + * + */ + +int +PepCode_Get(PyCodeObject *co, const char *name) +{ + PyObject *ob = (PyObject *)co; + PyObject *ob_ret; + int ret = -1; + + ob_ret = PyObject_GetAttrString(ob, name); + if (ob_ret != NULL) { + long long_ret = PyLong_AsLong(ob_ret); + Py_DECREF(ob_ret); + ret = (int) long_ret; + } + return ret; +} + +/***************************************************************************** + * + * Support for datetime.h + * + */ + +static PyTypeObject *dt_getCheck(const char *name) +{ + PyObject *op = PyObject_GetAttrString(PyDateTimeAPI->module, name); + if (op == NULL) { + fprintf(stderr, "datetime.%s not found\n", name); + Py_FatalError("aborting"); + } + return (PyTypeObject *)op; +} + +// init_DateTime is called earlier than our module init. +// We use the provided PyDateTime_IMPORT machinery. +datetime_struc * +init_DateTime(void) +{ + static int initialized = 0; + if (!initialized) { + PyDateTimeAPI = (datetime_struc *)malloc(sizeof(datetime_struc)); + if (PyDateTimeAPI == NULL) + Py_FatalError("PyDateTimeAPI malloc error, aborting"); + PyDateTimeAPI->module = PyImport_ImportModule("datetime"); + if (PyDateTimeAPI->module == NULL) + Py_FatalError("datetime module not found, aborting"); + PyDateTimeAPI->DateType = dt_getCheck("date"); + PyDateTimeAPI->DateTimeType = dt_getCheck("datetime"); + PyDateTimeAPI->TimeType = dt_getCheck("time"); + PyDateTimeAPI->DeltaType = dt_getCheck("timedelta"); + PyDateTimeAPI->TZInfoType = dt_getCheck("tzinfo"); + initialized = 1; + } + return PyDateTimeAPI; +} + +int +PyDateTime_Get(PyObject *ob, const char *name) +{ + PyObject *ob_ret; + int ret = -1; + + ob_ret = PyObject_GetAttrString(ob, name); + if (ob_ret != NULL) { + long long_ret = PyLong_AsLong(ob_ret); + Py_DECREF(ob_ret); + ret = (int) long_ret; + } + return ret; +} + +PyObject * +PyDate_FromDate(int year, int month, int day) +{ + return PyObject_CallFunction((PyObject *)PyDateTimeAPI->DateType, + (char *)"(iii)", year, month, day); +} + +PyObject * +PyDateTime_FromDateAndTime(int year, int month, int day, + int hour, int min, int sec, int usec) +{ + return PyObject_CallFunction((PyObject *)PyDateTimeAPI->DateTimeType, + (char *)"(iiiiiii)", year, month, day, + hour, min, sec, usec); +} + +PyObject * +PyTime_FromTime(int hour, int min, int sec, int usec) +{ + return PyObject_CallFunction((PyObject *)PyDateTimeAPI->TimeType, + (char *)"(iiii)", hour, min, sec, usec); +} + +/***************************************************************************** + * + * Support for pythonrun.h + * + */ + +// Flags are ignored in these simple helpers. +PyObject * +PyRun_String(const char *str, int start, PyObject *globals, PyObject *locals) +{ + PyObject* code = Py_CompileString(str, "pyscript", start); + PyObject* ret = NULL; + + if (code != NULL) { + ret = PyEval_EvalCode(code, globals, locals); + } + Py_XDECREF(code); + return ret; +} + +// This is only a simple local helper that returns a computed variable. +static PyObject * +PepRun_GetResult(const char *command, const char *resvar) +{ + PyObject *d, *v, *res; + + d = PyDict_New(); + if (d == NULL || PyDict_SetItemString(d, "__builtins__", + PyEval_GetBuiltins()) < 0) + return NULL; + v = PyRun_String(command, Py_file_input, d, d); + res = v ? PyDict_GetItemString(d, resvar) : NULL; + Py_XDECREF(v); + Py_DECREF(d); + return res; +} + +/***************************************************************************** + * + * Support for classobject.h + * + */ + +PyTypeObject *PepMethod_TypePtr = NULL; + +static PyTypeObject *getMethodType(void) +{ + static const char prog[] = + "class _C:\n" + " def _m(self): pass\n" + "MethodType = type(_C()._m)\n"; + return (PyTypeObject *) PepRun_GetResult(prog, "MethodType"); +} + +// We have no access to PyMethod_New and must call types.MethodType, instead. +PyObject * +PyMethod_New(PyObject *func, PyObject *self) +{ + return PyObject_CallFunction((PyObject *)PepMethod_TypePtr, + (char *)"(OO)", func, self); +} + +PyObject * +PyMethod_Function(PyObject *im) +{ + PyObject *ret = PyObject_GetAttrString(im, "__func__"); + + // We have to return a borrowed reference. + Py_DECREF(ret); + return ret; +} + +PyObject * +PyMethod_Self(PyObject *im) +{ + PyObject *ret = PyObject_GetAttrString(im, "__self__"); + + // We have to return a borrowed reference. + // If we don't obey that here, then we get a test error! + Py_DECREF(ret); + return ret; +} + +/***************************************************************************** + * + * Support for funcobject.h + * + */ + +PyObject * +PepFunction_Get(PyObject *ob, const char *name) +{ + PyObject *ret; + + // We have to return a borrowed reference. + ret = PyObject_GetAttrString(ob, name); + Py_XDECREF(ret); + return ret; +} + +/***************************************************************************** + * + * Support for funcobject.h + * + */ + +// this became necessary after Windows was activated. + +PyTypeObject *PepFunction_TypePtr = NULL; + +static PyTypeObject *getFunctionType(void) +{ + static const char prog[] = + "from types import FunctionType\n"; + return (PyTypeObject *) PepRun_GetResult(prog, "FunctionType"); +} + +/***************************************************************************** + * + * Extra support for signature.cpp + * + */ + +PyTypeObject *PepStaticMethod_TypePtr = NULL; + +static PyTypeObject *getStaticMethodType(void) +{ + static const char prog[] = + "StaticMethodType = type(str.__dict__['maketrans'])\n"; + return (PyTypeObject *) PepRun_GetResult(prog, "StaticMethodType"); +} + +#endif // Py_LIMITED_API + +/***************************************************************************** + * + * Common newly needed functions + * + */ + +// The introduction of heaptypes converted many type names to the +// dotted form, since PyType_FromSpec uses it to compute the module +// name. This function reverts this effect. +const char * +PepType_GetNameStr(PyTypeObject *type) +{ + const char *ret = PepType(type)->tp_name; + const char *nodots = strrchr(ret, '.'); + if (nodots) + ret = nodots + 1; + return ret; +} + +/***************************************************************************** + * + * Module Initialization + * + */ + +void +Pep_Init() +{ + check_PepTypeObject_valid(); +#ifdef Py_LIMITED_API + Pep_GetVerboseFlag(); + PepMethod_TypePtr = getMethodType(); + PepFunction_TypePtr = getFunctionType(); + PepStaticMethod_TypePtr = getStaticMethodType(); +#endif +} + +} // extern "C" |