cpython-withatomic / Objects / methodobject.c

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
/* Method object implementation */

#include "Python.h"
#include "structmember.h"

/* Free list for method objects to safe malloc/free overhead
 * The m_self element is used to chain the objects.
 */
static PyCFunctionObject *free_list = NULL;
static int numfree = 0;
#ifndef PyCFunction_MAXFREELIST
#define PyCFunction_MAXFREELIST 256
#endif

PyObject *
PyCFunction_NewEx(PyMethodDef *ml, PyObject *self, PyObject *module)
{
    PyCFunctionObject *op;
    op = free_list;
    if (op != NULL) {
        free_list = (PyCFunctionObject *)(op->m_self);
        PyObject_INIT(op, &PyCFunction_Type);
        numfree--;
    }
    else {
        op = PyObject_GC_New(PyCFunctionObject, &PyCFunction_Type);
        if (op == NULL)
            return NULL;
    }
    op->m_ml = ml;
    Py_XINCREF(self);
    op->m_self = self;
    Py_XINCREF(module);
    op->m_module = module;
    _PyObject_GC_TRACK(op);
    return (PyObject *)op;
}

PyCFunction
PyCFunction_GetFunction(PyObject *op)
{
    if (!PyCFunction_Check(op)) {
        PyErr_BadInternalCall();
        return NULL;
    }
    return ((PyCFunctionObject *)op) -> m_ml -> ml_meth;
}

PyObject *
PyCFunction_GetSelf(PyObject *op)
{
    if (!PyCFunction_Check(op)) {
        PyErr_BadInternalCall();
        return NULL;
    }
    return ((PyCFunctionObject *)op) -> m_self;
}

int
PyCFunction_GetFlags(PyObject *op)
{
    if (!PyCFunction_Check(op)) {
        PyErr_BadInternalCall();
        return -1;
    }
    return ((PyCFunctionObject *)op) -> m_ml -> ml_flags;
}

PyObject *
PyCFunction_Call(PyObject *func, PyObject *arg, PyObject *kw)
{
    PyCFunctionObject* f = (PyCFunctionObject*)func;
    PyCFunction meth = PyCFunction_GET_FUNCTION(func);
    PyObject *self = PyCFunction_GET_SELF(func);
    Py_ssize_t size;

    switch (PyCFunction_GET_FLAGS(func) & ~(METH_CLASS | METH_STATIC | METH_COEXIST)) {
    case METH_VARARGS:
        if (kw == NULL || PyDict_Size(kw) == 0)
            return (*meth)(self, arg);
        break;
    case METH_VARARGS | METH_KEYWORDS:
    case METH_OLDARGS | METH_KEYWORDS:
        return (*(PyCFunctionWithKeywords)meth)(self, arg, kw);
    case METH_NOARGS:
        if (kw == NULL || PyDict_Size(kw) == 0) {
            size = PyTuple_GET_SIZE(arg);
            if (size == 0)
                return (*meth)(self, NULL);
            PyErr_Format(PyExc_TypeError,
                "%.200s() takes no arguments (%zd given)",
                f->m_ml->ml_name, size);
            return NULL;
        }
        break;
    case METH_O:
        if (kw == NULL || PyDict_Size(kw) == 0) {
            size = PyTuple_GET_SIZE(arg);
            if (size == 1)
                return (*meth)(self, PyTuple_GET_ITEM(arg, 0));
            PyErr_Format(PyExc_TypeError,
                "%.200s() takes exactly one argument (%zd given)",
                f->m_ml->ml_name, size);
            return NULL;
        }
        break;
    case METH_OLDARGS:
        /* the really old style */
        if (kw == NULL || PyDict_Size(kw) == 0) {
            size = PyTuple_GET_SIZE(arg);
            if (size == 1)
                arg = PyTuple_GET_ITEM(arg, 0);
            else if (size == 0)
                arg = NULL;
            return (*meth)(self, arg);
        }
        break;
    default:
        PyErr_BadInternalCall();
        return NULL;
    }
    PyErr_Format(PyExc_TypeError, "%.200s() takes no keyword arguments",
                 f->m_ml->ml_name);
    return NULL;
}

/* Methods (the standard built-in methods, that is) */

static void
meth_dealloc(PyCFunctionObject *m)
{
    _PyObject_GC_UNTRACK(m);
    Py_XDECREF(m->m_self);
    Py_XDECREF(m->m_module);
    if (numfree < PyCFunction_MAXFREELIST) {
        m->m_self = (PyObject *)free_list;
        free_list = m;
        numfree++;
    }
    else {
        PyObject_GC_Del(m);
    }
}

static PyObject *
meth_get__doc__(PyCFunctionObject *m, void *closure)
{
    const char *doc = m->m_ml->ml_doc;

    if (doc != NULL)
        return PyString_FromString(doc);
    Py_INCREF(Py_None);
    return Py_None;
}

static PyObject *
meth_get__name__(PyCFunctionObject *m, void *closure)
{
    return PyString_FromString(m->m_ml->ml_name);
}

static int
meth_traverse(PyCFunctionObject *m, visitproc visit, void *arg)
{
    Py_VISIT(m->m_self);
    Py_VISIT(m->m_module);
    return 0;
}

static PyObject *
meth_get__self__(PyCFunctionObject *m, void *closure)
{
    PyObject *self;
    if (PyEval_GetRestricted()) {
        PyErr_SetString(PyExc_RuntimeError,
            "method.__self__ not accessible in restricted mode");
        return NULL;
    }
    self = m->m_self;
    if (self == NULL)
        self = Py_None;
    Py_INCREF(self);
    return self;
}

static PyGetSetDef meth_getsets [] = {
    {"__doc__",  (getter)meth_get__doc__,  NULL, NULL},
    {"__name__", (getter)meth_get__name__, NULL, NULL},
    {"__self__", (getter)meth_get__self__, NULL, NULL},
    {0}
};

#define OFF(x) offsetof(PyCFunctionObject, x)

static PyMemberDef meth_members[] = {
    {"__module__",    T_OBJECT,     OFF(m_module), PY_WRITE_RESTRICTED},
    {NULL}
};

static PyObject *
meth_repr(PyCFunctionObject *m)
{
    if (m->m_self == NULL)
        return PyString_FromFormat("<built-in function %s>",
                                   m->m_ml->ml_name);
    return PyString_FromFormat("<built-in method %s of %s object at %p>",
                               m->m_ml->ml_name,
                               m->m_self->ob_type->tp_name,
                               m->m_self);
}

static int
meth_compare(PyCFunctionObject *a, PyCFunctionObject *b)
{
    if (a->m_self != b->m_self)
        return (a->m_self < b->m_self) ? -1 : 1;
    if (a->m_ml->ml_meth == b->m_ml->ml_meth)
        return 0;
    if (strcmp(a->m_ml->ml_name, b->m_ml->ml_name) < 0)
        return -1;
    else
        return 1;
}

static PyObject *
meth_richcompare(PyObject *self, PyObject *other, int op)
{
    PyCFunctionObject *a, *b;
    PyObject *res;
    int eq;

    if (op != Py_EQ && op != Py_NE) {
        /* Py3K warning if comparison isn't == or !=.  */
        if (PyErr_WarnPy3k("builtin_function_or_method order "
                           "comparisons not supported in 3.x", 1) < 0) {
            return NULL;
        }

        Py_INCREF(Py_NotImplemented);
        return Py_NotImplemented;
    }
    else if (!PyCFunction_Check(self) || !PyCFunction_Check(other)) {
        Py_INCREF(Py_NotImplemented);
        return Py_NotImplemented;
    }
    a = (PyCFunctionObject *)self;
    b = (PyCFunctionObject *)other;
    eq = a->m_self == b->m_self;
    if (eq)
        eq = a->m_ml->ml_meth == b->m_ml->ml_meth;
    if (op == Py_EQ)
        res = eq ? Py_True : Py_False;
    else
        res = eq ? Py_False : Py_True;
    Py_INCREF(res);
    return res;
}

static long
meth_hash(PyCFunctionObject *a)
{
    long x,y;
    if (a->m_self == NULL)
        x = 0;
    else {
        x = PyObject_Hash(a->m_self);
        if (x == -1)
            return -1;
    }
    y = _Py_HashPointer((void*)(a->m_ml->ml_meth));
    if (y == -1)
        return -1;
    x ^= y;
    if (x == -1)
        x = -2;
    return x;
}


PyTypeObject PyCFunction_Type = {
    PyVarObject_HEAD_INIT(&PyType_Type, 0)
    "builtin_function_or_method",
    sizeof(PyCFunctionObject),
    0,
    (destructor)meth_dealloc,                   /* tp_dealloc */
    0,                                          /* tp_print */
    0,                                          /* tp_getattr */
    0,                                          /* tp_setattr */
    (cmpfunc)meth_compare,                      /* tp_compare */
    (reprfunc)meth_repr,                        /* tp_repr */
    0,                                          /* tp_as_number */
    0,                                          /* tp_as_sequence */
    0,                                          /* tp_as_mapping */
    (hashfunc)meth_hash,                        /* tp_hash */
    PyCFunction_Call,                           /* tp_call */
    0,                                          /* tp_str */
    PyObject_GenericGetAttr,                    /* tp_getattro */
    0,                                          /* tp_setattro */
    0,                                          /* tp_as_buffer */
    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,/* tp_flags */
    0,                                          /* tp_doc */
    (traverseproc)meth_traverse,                /* tp_traverse */
    0,                                          /* tp_clear */
    meth_richcompare,                                           /* tp_richcompare */
    0,                                          /* tp_weaklistoffset */
    0,                                          /* tp_iter */
    0,                                          /* tp_iternext */
    0,                                          /* tp_methods */
    meth_members,                               /* tp_members */
    meth_getsets,                               /* tp_getset */
    0,                                          /* tp_base */
    0,                                          /* tp_dict */
};

/* List all methods in a chain -- helper for findmethodinchain */

static PyObject *
listmethodchain(PyMethodChain *chain)
{
    PyMethodChain *c;
    PyMethodDef *ml;
    int i, n;
    PyObject *v;

    n = 0;
    for (c = chain; c != NULL; c = c->link) {
        for (ml = c->methods; ml->ml_name != NULL; ml++)
            n++;
    }
    v = PyList_New(n);
    if (v == NULL)
        return NULL;
    i = 0;
    for (c = chain; c != NULL; c = c->link) {
        for (ml = c->methods; ml->ml_name != NULL; ml++) {
            PyList_SetItem(v, i, PyString_FromString(ml->ml_name));
            i++;
        }
    }
    if (PyErr_Occurred()) {
        Py_DECREF(v);
        return NULL;
    }
    PyList_Sort(v);
    return v;
}

/* Find a method in a method chain */

PyObject *
Py_FindMethodInChain(PyMethodChain *chain, PyObject *self, const char *name)
{
    if (name[0] == '_' && name[1] == '_') {
        if (strcmp(name, "__methods__") == 0) {
            if (PyErr_WarnPy3k("__methods__ not supported in 3.x",
                               1) < 0)
                return NULL;
            return listmethodchain(chain);
        }
        if (strcmp(name, "__doc__") == 0) {
            const char *doc = self->ob_type->tp_doc;
            if (doc != NULL)
                return PyString_FromString(doc);
        }
    }
    while (chain != NULL) {
        PyMethodDef *ml = chain->methods;
        for (; ml->ml_name != NULL; ml++) {
            if (name[0] == ml->ml_name[0] &&
                strcmp(name+1, ml->ml_name+1) == 0)
                /* XXX */
                return PyCFunction_New(ml, self);
        }
        chain = chain->link;
    }
    PyErr_SetString(PyExc_AttributeError, name);
    return NULL;
}

/* Find a method in a single method list */

PyObject *
Py_FindMethod(PyMethodDef *methods, PyObject *self, const char *name)
{
    PyMethodChain chain;
    chain.methods = methods;
    chain.link = NULL;
    return Py_FindMethodInChain(&chain, self, name);
}

/* Clear out the free list */

int
PyCFunction_ClearFreeList(void)
{
    int freelist_size = numfree;

    while (free_list) {
        PyCFunctionObject *v = free_list;
        free_list = (PyCFunctionObject *)(v->m_self);
        PyObject_GC_Del(v);
        numfree--;
    }
    assert(numfree == 0);
    return freelist_size;
}

void
PyCFunction_Fini(void)
{
    (void)PyCFunction_ClearFreeList();
}

/* PyCFunction_New() is now just a macro that calls PyCFunction_NewEx(),
   but it's part of the API so we need to keep a function around that
   existing C extensions can call.
*/

#undef PyCFunction_New
PyAPI_FUNC(PyObject *) PyCFunction_New(PyMethodDef *, PyObject *);

PyObject *
PyCFunction_New(PyMethodDef *ml, PyObject *self)
{
    return PyCFunction_NewEx(ml, self, NULL);
}
Tip: Filter by directory path e.g. /media app.js to search for public/media/app.js.
Tip: Use camelCasing e.g. ProjME to search for ProjectModifiedEvent.java.
Tip: Filter by extension type e.g. /repo .js to search for all .js files in the /repo directory.
Tip: Separate your search with spaces e.g. /ssh pom.xml to search for src/ssh/pom.xml.
Tip: Use ↑ and ↓ arrow keys to navigate and return to view the file.
Tip: You can also navigate files with Ctrl+j (next) and Ctrl+k (previous) and view the file with Ctrl+o.
Tip: You can also navigate files with Alt+j (next) and Alt+k (previous) and view the file with Alt+o.