### Bug Summary

File: | Objects/frameobject.c
Location: | line 480, column 13
Description: | Access to field 'co_nlocals' results in a dereference of a null pointer (loaded from field 'f_code')

### Annotated Source Code

1 | /* Frame object implementation */
2 |
3 | #include "Python.h"
4 |
5 | #include "code.h"
6 | #include "frameobject.h"
7 | #include "opcode.h"
8 | #include "structmember.h"
9 |
10 | #undef MIN
11 | #undef MAX
12 | #define MIN(a, b)((a) < (b) ? (a) : (b)) ((a) < (b) ? (a) : (b))
13 | #define MAX(a, b)((a) > (b) ? (a) : (b)) ((a) > (b) ? (a) : (b))
14 |
15 | #define OFF(x)__builtin_offsetof(PyFrameObject, x) offsetof(PyFrameObject, x)__builtin_offsetof(PyFrameObject, x)
16 |
17 | static PyMemberDef frame_memberlist[] = {
18 | {"f_back", T_OBJECT6, OFF(f_back)__builtin_offsetof(PyFrameObject, f_back), READONLY1},
19 | {"f_code", T_OBJECT6, OFF(f_code)__builtin_offsetof(PyFrameObject, f_code), READONLY1},
20 | {"f_builtins", T_OBJECT6, OFF(f_builtins)__builtin_offsetof(PyFrameObject, f_builtins),READONLY1},
21 | {"f_globals", T_OBJECT6, OFF(f_globals)__builtin_offsetof(PyFrameObject, f_globals), READONLY1},
22 | {"f_lasti", T_INT1, OFF(f_lasti)__builtin_offsetof(PyFrameObject, f_lasti), READONLY1},
23 | {NULL((void*)0)} /* Sentinel */
24 | };
25 |
26 | static PyObject *
27 | frame_getlocals(PyFrameObject *f, void *closure)
28 | {
29 | PyFrame_FastToLocals(f);
30 | Py_INCREF(f->f_locals)( _Py_RefTotal++ , ((PyObject*)(f->f_locals))->ob_refcnt ++);
31 | return f->f_locals;
32 | }
33 |
34 | int
35 | PyFrame_GetLineNumber(PyFrameObject *f)
36 | {
37 | if (f->f_trace)
38 | return f->f_lineno;
39 | else
40 | return PyCode_Addr2Line(f->f_code, f->f_lasti);
41 | }
42 |
43 | static PyObject *
44 | frame_getlineno(PyFrameObject *f, void *closure)
45 | {
46 | return PyLong_FromLong(PyFrame_GetLineNumber(f));
47 | }
48 |
49 | /* Setter for f_lineno - you can set f_lineno from within a trace function in
50 | * order to jump to a given line of code, subject to some restrictions. Most
51 | * lines are OK to jump to because they don't make any assumptions about the
52 | * state of the stack (obvious because you could remove the line and the code
53 | * would still work without any stack errors), but there are some constructs
54 | * that limit jumping:
55 | *
56 | * o Lines with an 'except' statement on them can't be jumped to, because
57 | * they expect an exception to be on the top of the stack.
58 | * o Lines that live in a 'finally' block can't be jumped from or to, since
59 | * the END_FINALLY expects to clean up the stack after the 'try' block.
60 | * o 'try'/'for'/'while' blocks can't be jumped into because the blockstack
61 | * needs to be set up before their code runs, and for 'for' loops the
62 | * iterator needs to be on the stack.
63 | */
64 | static int
65 | frame_setlineno(PyFrameObject *f, PyObject* p_new_lineno)
66 | {
67 | int new_lineno = 0; /* The new value of f_lineno */
68 | long l_new_lineno;
69 | int overflow;
70 | int new_lasti = 0; /* The new value of f_lasti */
71 | int new_iblock = 0; /* The new value of f_iblock */
72 | unsigned char *code = NULL((void*)0); /* The bytecode for the frame... */
73 | Py_ssize_t code_len = 0; /* ...and its length */
74 | unsigned char *lnotab = NULL((void*)0); /* Iterating over co_lnotab */
75 | Py_ssize_t lnotab_len = 0; /* (ditto) */
76 | int offset = 0; /* (ditto) */
77 | int line = 0; /* (ditto) */
78 | int addr = 0; /* (ditto) */
79 | int min_addr = 0; /* Scanning the SETUPs and POPs */
80 | int max_addr = 0; /* (ditto) */
81 | int delta_iblock = 0; /* (ditto) */
82 | int min_delta_iblock = 0; /* (ditto) */
83 | int min_iblock = 0; /* (ditto) */
84 | int f_lasti_setup_addr = 0; /* Policing no-jump-into-finally */
85 | int new_lasti_setup_addr = 0; /* (ditto) */
86 | int blockstack[CO_MAXBLOCKS20]; /* Walking the 'finally' blocks */
87 | int in_finally[CO_MAXBLOCKS20]; /* (ditto) */
88 | int blockstack_top = 0; /* (ditto) */
89 | unsigned char setup_op = 0; /* (ditto) */
90 |
91 | /* f_lineno must be an integer. */
92 | if (!PyLong_CheckExact(p_new_lineno)((((PyObject*)(p_new_lineno))->ob_type) == &PyLong_Type )) {
93 | PyErr_SetString(PyExc_ValueError,
94 | "lineno must be an integer");
95 | return -1;
96 | }
97 |
98 | /* You can only do this from within a trace function, not via
99 | * _getframe or similar hackery. */
100 | if (!f->f_trace)
101 | {
102 | PyErr_Format(PyExc_ValueError,
103 | "f_lineno can only be set by a"
104 | " line trace function");
105 | return -1;
106 | }
107 |
108 | /* Fail if the line comes before the start of the code block. */
109 | l_new_lineno = PyLong_AsLongAndOverflow(p_new_lineno, &overflow);
110 | if (overflow
111 | #if SIZEOF_LONG8 > SIZEOF_INT4
112 | || l_new_lineno > INT_MAX2147483647
113 | || l_new_lineno < INT_MIN(-2147483647 -1)
114 | #endif
115 | ) {
116 | PyErr_SetString(PyExc_ValueError,
117 | "lineno out of range");
118 | return -1;
119 | }
120 | new_lineno = (int)l_new_lineno;
121 |
122 | if (new_lineno < f->f_code->co_firstlineno) {
123 | PyErr_Format(PyExc_ValueError,
124 | "line %d comes before the current code block",
125 | new_lineno);
126 | return -1;
127 | }
128 | else if (new_lineno == f->f_code->co_firstlineno) {
129 | new_lasti = 0;
130 | new_lineno = f->f_code->co_firstlineno;
131 | }
132 | else {
133 | /* Find the bytecode offset for the start of the given
134 | * line, or the first code-owning line after it. */
135 | char *tmp;
136 | PyBytes_AsStringAndSize(f->f_code->co_lnotab,
137 | &tmp, &lnotab_len);
138 | lnotab = (unsigned char *) tmp;
139 | addr = 0;
140 | line = f->f_code->co_firstlineno;
141 | new_lasti = -1;
142 | for (offset = 0; offset < lnotab_len; offset += 2) {
143 | addr += lnotab[offset];
144 | line += lnotab[offset+1];
145 | if (line >= new_lineno) {
146 | new_lasti = addr;
147 | new_lineno = line;
148 | break;
149 | }
150 | }
151 | }
152 |
153 | /* If we didn't reach the requested line, return an error. */
154 | if (new_lasti == -1) {
155 | PyErr_Format(PyExc_ValueError,
156 | "line %d comes after the current code block",
157 | new_lineno);
158 | return -1;
159 | }
160 |
161 | /* We're now ready to look at the bytecode. */
162 | PyBytes_AsStringAndSize(f->f_code->co_code, (char **)&code, &code_len);
163 | min_addr = MIN(new_lasti, f->f_lasti)((new_lasti) < (f->f_lasti) ? (new_lasti) : (f->f_lasti ));
164 | max_addr = MAX(new_lasti, f->f_lasti)((new_lasti) > (f->f_lasti) ? (new_lasti) : (f->f_lasti ));
165 |
166 | /* You can't jump onto a line with an 'except' statement on it -
167 | * they expect to have an exception on the top of the stack, which
168 | * won't be true if you jump to them. They always start with code
169 | * that either pops the exception using POP_TOP (plain 'except:'
170 | * lines do this) or duplicates the exception on the stack using
171 | * DUP_TOP (if there's an exception type specified). See compile.c,
172 | * 'com_try_except' for the full details. There aren't any other
173 | * cases (AFAIK) where a line's code can start with DUP_TOP or
174 | * POP_TOP, but if any ever appear, they'll be subject to the same
175 | * restriction (but with a different error message). */
176 | if (code[new_lasti] == DUP_TOP4 || code[new_lasti] == POP_TOP1) {
177 | PyErr_SetString(PyExc_ValueError,
178 | "can't jump to 'except' line as there's no exception");
179 | return -1;
180 | }
181 |
182 | /* You can't jump into or out of a 'finally' block because the 'try'
183 | * block leaves something on the stack for the END_FINALLY to clean
184 | * up. So we walk the bytecode, maintaining a simulated blockstack.
185 | * When we reach the old or new address and it's in a 'finally' block
186 | * we note the address of the corresponding SETUP_FINALLY. The jump
187 | * is only legal if neither address is in a 'finally' block or
188 | * they're both in the same one. 'blockstack' is a stack of the
189 | * bytecode addresses of the SETUP_X opcodes, and 'in_finally' tracks
190 | * whether we're in a 'finally' block at each blockstack level. */
191 | f_lasti_setup_addr = -1;
192 | new_lasti_setup_addr = -1;
193 | memset(blockstack, '\0', sizeof(blockstack))((__builtin_object_size (blockstack, 0) != (size_t) -1) ? __builtin___memset_chk (blockstack, '\0', sizeof(blockstack), __builtin_object_size (blockstack, 0)) : __inline_memset_chk (blockstack, '\0', sizeof (blockstack)));
194 | memset(in_finally, '\0', sizeof(in_finally))((__builtin_object_size (in_finally, 0) != (size_t) -1) ? __builtin___memset_chk (in_finally, '\0', sizeof(in_finally), __builtin_object_size (in_finally, 0)) : __inline_memset_chk (in_finally, '\0', sizeof (in_finally)));
195 | blockstack_top = 0;
196 | for (addr = 0; addr < code_len; addr++) {
197 | unsigned char op = code[addr];
198 | switch (op) {
199 | case SETUP_LOOP120:
200 | case SETUP_EXCEPT121:
201 | case SETUP_FINALLY122:
202 | blockstack[blockstack_top++] = addr;
203 | in_finally[blockstack_top-1] = 0;
204 | break;
205 |
206 | case POP_BLOCK87:
207 | assert(blockstack_top > 0)(__builtin_expect(!(blockstack_top > 0), 0) ? __assert_rtn (__func__, "Objects/frameobject.c", 207, "blockstack_top > 0" ) : (void)0);
208 | setup_op = code[blockstack[blockstack_top-1]];
209 | if (setup_op == SETUP_FINALLY122) {
210 | in_finally[blockstack_top-1] = 1;
211 | }
212 | else {
213 | blockstack_top--;
214 | }
215 | break;
216 |
217 | case END_FINALLY88:
218 | /* Ignore END_FINALLYs for SETUP_EXCEPTs - they exist
219 | * in the bytecode but don't correspond to an actual
220 | * 'finally' block. (If blockstack_top is 0, we must
221 | * be seeing such an END_FINALLY.) */
222 | if (blockstack_top > 0) {
223 | setup_op = code[blockstack[blockstack_top-1]];
224 | if (setup_op == SETUP_FINALLY122) {
225 | blockstack_top--;
226 | }
227 | }
228 | break;
229 | }
230 |
231 | /* For the addresses we're interested in, see whether they're
232 | * within a 'finally' block and if so, remember the address
233 | * of the SETUP_FINALLY. */
234 | if (addr == new_lasti || addr == f->f_lasti) {
235 | int i = 0;
236 | int setup_addr = -1;
237 | for (i = blockstack_top-1; i >= 0; i--) {
238 | if (in_finally[i]) {
239 | setup_addr = blockstack[i];
240 | break;
241 | }
242 | }
243 |
244 | if (setup_addr != -1) {
245 | if (addr == new_lasti) {
246 | new_lasti_setup_addr = setup_addr;
247 | }
248 |
249 | if (addr == f->f_lasti) {
250 | f_lasti_setup_addr = setup_addr;
251 | }
252 | }
253 | }
254 |
255 | if (op >= HAVE_ARGUMENT90) {
256 | addr += 2;
257 | }
258 | }
259 |
260 | /* Verify that the blockstack tracking code didn't get lost. */
261 | assert(blockstack_top == 0)(__builtin_expect(!(blockstack_top == 0), 0) ? __assert_rtn(__func__ , "Objects/frameobject.c", 261, "blockstack_top == 0") : (void )0);
262 |
263 | /* After all that, are we jumping into / out of a 'finally' block? */
264 | if (new_lasti_setup_addr != f_lasti_setup_addr) {
265 | PyErr_SetString(PyExc_ValueError,
266 | "can't jump into or out of a 'finally' block");
267 | return -1;
268 | }
269 |
270 |
271 | /* Police block-jumping (you can't jump into the middle of a block)
272 | * and ensure that the blockstack finishes up in a sensible state (by
273 | * popping any blocks we're jumping out of). We look at all the
274 | * blockstack operations between the current position and the new
275 | * one, and keep track of how many blocks we drop out of on the way.
276 | * By also keeping track of the lowest blockstack position we see, we
277 | * can tell whether the jump goes into any blocks without coming out
278 | * again - in that case we raise an exception below. */
279 | delta_iblock = 0;
280 | for (addr = min_addr; addr < max_addr; addr++) {
281 | unsigned char op = code[addr];
282 | switch (op) {
283 | case SETUP_LOOP120:
284 | case SETUP_EXCEPT121:
285 | case SETUP_FINALLY122:
286 | delta_iblock++;
287 | break;
288 |
289 | case POP_BLOCK87:
290 | delta_iblock--;
291 | break;
292 | }
293 |
294 | min_delta_iblock = MIN(min_delta_iblock, delta_iblock)((min_delta_iblock) < (delta_iblock) ? (min_delta_iblock) : (delta_iblock));
295 |
296 | if (op >= HAVE_ARGUMENT90) {
297 | addr += 2;
298 | }
299 | }
300 |
301 | /* Derive the absolute iblock values from the deltas. */
302 | min_iblock = f->f_iblock + min_delta_iblock;
303 | if (new_lasti > f->f_lasti) {
304 | /* Forwards jump. */
305 | new_iblock = f->f_iblock + delta_iblock;
306 | }
307 | else {
308 | /* Backwards jump. */
309 | new_iblock = f->f_iblock - delta_iblock;
310 | }
311 |
312 | /* Are we jumping into a block? */
313 | if (new_iblock > min_iblock) {
314 | PyErr_SetString(PyExc_ValueError,
315 | "can't jump into the middle of a block");
316 | return -1;
317 | }
318 |
319 | /* Pop any blocks that we're jumping out of. */
320 | while (f->f_iblock > new_iblock) {
321 | PyTryBlock *b = &f->f_blockstack[--f->f_iblock];
322 | while ((f->f_stacktop - f->f_valuestack) > b->b_level) {
323 | PyObject *v = (*--f->f_stacktop);
324 | Py_DECREF(v)do { if (_Py_RefTotal-- , --((PyObject*)(v))->ob_refcnt != 0) { if (((PyObject*)v)->ob_refcnt < 0) _Py_NegativeRefcount ("Objects/frameobject.c", 324, (PyObject *)(v)); } else _Py_Dealloc ((PyObject *)(v)); } while (0);
325 | }
326 | }
327 |
328 | /* Finally set the new f_lineno and f_lasti and return OK. */
329 | f->f_lineno = new_lineno;
330 | f->f_lasti = new_lasti;
331 | return 0;
332 | }
333 |
334 | static PyObject *
335 | frame_gettrace(PyFrameObject *f, void *closure)
336 | {
337 | PyObject* trace = f->f_trace;
338 |
339 | if (trace == NULL((void*)0))
340 | trace = Py_None(&_Py_NoneStruct);
341 |
342 | Py_INCREF(trace)( _Py_RefTotal++ , ((PyObject*)(trace))->ob_refcnt++);
343 |
344 | return trace;
345 | }
346 |
347 | static int
348 | frame_settrace(PyFrameObject *f, PyObject* v, void *closure)
349 | {
350 | PyObject* old_value;
351 |
352 | /* We rely on f_lineno being accurate when f_trace is set. */
353 | f->f_lineno = PyFrame_GetLineNumber(f);
354 |
355 | old_value = f->f_trace;
356 | Py_XINCREF(v)do { if ((v) == ((void*)0)) ; else ( _Py_RefTotal++ , ((PyObject *)(v))->ob_refcnt++); } while (0);
357 | f->f_trace = v;
358 | Py_XDECREF(old_value)do { if ((old_value) == ((void*)0)) ; else do { if (_Py_RefTotal -- , --((PyObject*)(old_value))->ob_refcnt != 0) { if (((PyObject *)old_value)->ob_refcnt < 0) _Py_NegativeRefcount("Objects/frameobject.c" , 358, (PyObject *)(old_value)); } else _Py_Dealloc((PyObject *)(old_value)); } while (0); } while (0);
359 |
360 | return 0;
361 | }
362 |
363 |
364 | static PyGetSetDef frame_getsetlist[] = {
365 | {"f_locals", (getter)frame_getlocals, NULL((void*)0), NULL((void*)0)},
366 | {"f_lineno", (getter)frame_getlineno,
367 | (setter)frame_setlineno, NULL((void*)0)},
368 | {"f_trace", (getter)frame_gettrace, (setter)frame_settrace, NULL((void*)0)},
369 | {0}
370 | };
371 |
372 | /* Stack frames are allocated and deallocated at a considerable rate.
373 | In an attempt to improve the speed of function calls, we:
374 |
375 | 1. Hold a single "zombie" frame on each code object. This retains
376 | the allocated and initialised frame object from an invocation of
377 | the code object. The zombie is reanimated the next time we need a
378 | frame object for that code object. Doing this saves the malloc/
379 | realloc required when using a free_list frame that isn't the
380 | correct size. It also saves some field initialisation.
381 |
382 | In zombie mode, no field of PyFrameObject holds a reference, but
383 | the following fields are still valid:
384 |
385 | * ob_type, ob_size, f_code, f_valuestack;
386 |
387 | * f_locals, f_trace,
388 | f_exc_type, f_exc_value, f_exc_traceback are NULL;
389 |
390 | * f_localsplus does not require re-allocation and
391 | the local variables in f_localsplus are NULL.
392 |
393 | 2. We also maintain a separate free list of stack frames (just like
394 | floats are allocated in a special way -- see floatobject.c). When
395 | a stack frame is on the free list, only the following members have
396 | a meaning:
397 | ob_type == &Frametype
398 | f_back next item on free list, or NULL
399 | f_stacksize size of value stack
400 | ob_size size of localsplus
401 | Note that the value and block stacks are preserved -- this can save
402 | another malloc() call or two (and two free() calls as well!).
403 | Also note that, unlike for integers, each frame object is a
404 | malloc'ed object in its own right -- it is only the actual calls to
405 | malloc() that we are trying to save here, not the administration.
406 | After all, while a typical program may make millions of calls, a
407 | call depth of more than 20 or 30 is probably already exceptional
408 | unless the program contains run-away recursion. I hope.
409 |
410 | Later, PyFrame_MAXFREELIST was added to bound the # of frames saved on
411 | free_list. Else programs creating lots of cyclic trash involving
412 | frames could provoke free_list into growing without bound.
413 | */
414 |
415 | static PyFrameObject *free_list = NULL((void*)0);
416 | static int numfree = 0; /* number of frames currently in free_list */
417 | /* max value for numfree */
418 | #define PyFrame_MAXFREELIST200 200
419 |
420 | static void
421 | frame_dealloc(PyFrameObject *f)
422 | {
423 | PyObject **p, **valuestack;
424 | PyCodeObject *co;
425 |
426 | PyObject_GC_UnTrack(f);
427 | Py_TRASHCAN_SAFE_BEGIN(f)if (_PyTrash_delete_nesting < 50) { ++_PyTrash_delete_nesting ;
428 | /* Kill all local variables */
429 | valuestack = f->f_valuestack;
430 | for (p = f->f_localsplus; p < valuestack; p++)
431 | Py_CLEAR(*p)do { if (*p) { PyObject *_py_tmp = (PyObject *)(*p); (*p) = ( (void*)0); do { if (_Py_RefTotal-- , --((PyObject*)(_py_tmp)) ->ob_refcnt != 0) { if (((PyObject*)_py_tmp)->ob_refcnt < 0) _Py_NegativeRefcount("Objects/frameobject.c", 431, ( PyObject *)(_py_tmp)); } else _Py_Dealloc((PyObject *)(_py_tmp )); } while (0); } } while (0);
432 |
433 | /* Free stack */
434 | if (f->f_stacktop != NULL((void*)0)) {
435 | for (p = valuestack; p < f->f_stacktop; p++)
436 | Py_XDECREF(*p)do { if ((*p) == ((void*)0)) ; else do { if (_Py_RefTotal-- , --((PyObject*)(*p))->ob_refcnt != 0) { if (((PyObject*)*p )->ob_refcnt < 0) _Py_NegativeRefcount("Objects/frameobject.c" , 436, (PyObject *)(*p)); } else _Py_Dealloc((PyObject *)(*p) ); } while (0); } while (0);
437 | }
438 |
439 | Py_XDECREF(f->f_back)do { if ((f->f_back) == ((void*)0)) ; else do { if (_Py_RefTotal -- , --((PyObject*)(f->f_back))->ob_refcnt != 0) { if ( ((PyObject*)f->f_back)->ob_refcnt < 0) _Py_NegativeRefcount ("Objects/frameobject.c", 439, (PyObject *)(f->f_back)); } else _Py_Dealloc((PyObject *)(f->f_back)); } while (0); } while (0);
440 | Py_DECREF(f->f_builtins)do { if (_Py_RefTotal-- , --((PyObject*)(f->f_builtins))-> ob_refcnt != 0) { if (((PyObject*)f->f_builtins)->ob_refcnt < 0) _Py_NegativeRefcount("Objects/frameobject.c", 440, ( PyObject *)(f->f_builtins)); } else _Py_Dealloc((PyObject * )(f->f_builtins)); } while (0);
441 | Py_DECREF(f->f_globals)do { if (_Py_RefTotal-- , --((PyObject*)(f->f_globals))-> ob_refcnt != 0) { if (((PyObject*)f->f_globals)->ob_refcnt < 0) _Py_NegativeRefcount("Objects/frameobject.c", 441, ( PyObject *)(f->f_globals)); } else _Py_Dealloc((PyObject * )(f->f_globals)); } while (0);
442 | Py_CLEAR(f->f_locals)do { if (f->f_locals) { PyObject *_py_tmp = (PyObject *)(f ->f_locals); (f->f_locals) = ((void*)0); do { if (_Py_RefTotal -- , --((PyObject*)(_py_tmp))->ob_refcnt != 0) { if (((PyObject *)_py_tmp)->ob_refcnt < 0) _Py_NegativeRefcount("Objects/frameobject.c" , 442, (PyObject *)(_py_tmp)); } else _Py_Dealloc((PyObject * )(_py_tmp)); } while (0); } } while (0);
443 | Py_CLEAR(f->f_trace)do { if (f->f_trace) { PyObject *_py_tmp = (PyObject *)(f-> f_trace); (f->f_trace) = ((void*)0); do { if (_Py_RefTotal -- , --((PyObject*)(_py_tmp))->ob_refcnt != 0) { if (((PyObject *)_py_tmp)->ob_refcnt < 0) _Py_NegativeRefcount("Objects/frameobject.c" , 443, (PyObject *)(_py_tmp)); } else _Py_Dealloc((PyObject * )(_py_tmp)); } while (0); } } while (0);
444 | Py_CLEAR(f->f_exc_type)do { if (f->f_exc_type) { PyObject *_py_tmp = (PyObject *) (f->f_exc_type); (f->f_exc_type) = ((void*)0); do { if ( _Py_RefTotal-- , --((PyObject*)(_py_tmp))->ob_refcnt != 0) { if (((PyObject*)_py_tmp)->ob_refcnt < 0) _Py_NegativeRefcount ("Objects/frameobject.c", 444, (PyObject *)(_py_tmp)); } else _Py_Dealloc((PyObject *)(_py_tmp)); } while (0); } } while ( 0);
445 | Py_CLEAR(f->f_exc_value)do { if (f->f_exc_value) { PyObject *_py_tmp = (PyObject * )(f->f_exc_value); (f->f_exc_value) = ((void*)0); do { if (_Py_RefTotal-- , --((PyObject*)(_py_tmp))->ob_refcnt != 0 ) { if (((PyObject*)_py_tmp)->ob_refcnt < 0) _Py_NegativeRefcount ("Objects/frameobject.c", 445, (PyObject *)(_py_tmp)); } else _Py_Dealloc((PyObject *)(_py_tmp)); } while (0); } } while ( 0);
446 | Py_CLEAR(f->f_exc_traceback)do { if (f->f_exc_traceback) { PyObject *_py_tmp = (PyObject *)(f->f_exc_traceback); (f->f_exc_traceback) = ((void* )0); do { if (_Py_RefTotal-- , --((PyObject*)(_py_tmp))->ob_refcnt != 0) { if (((PyObject*)_py_tmp)->ob_refcnt < 0) _Py_NegativeRefcount ("Objects/frameobject.c", 446, (PyObject *)(_py_tmp)); } else _Py_Dealloc((PyObject *)(_py_tmp)); } while (0); } } while ( 0);
447 |
448 | co = f->f_code;
449 | if (co->co_zombieframe == NULL((void*)0))
450 | co->co_zombieframe = f;
451 | else if (numfree < PyFrame_MAXFREELIST200) {
452 | ++numfree;
453 | f->f_back = free_list;
454 | free_list = f;
455 | }
456 | else
457 | PyObject_GC_Del(f);
458 |
459 | Py_DECREF(co)do { if (_Py_RefTotal-- , --((PyObject*)(co))->ob_refcnt != 0) { if (((PyObject*)co)->ob_refcnt < 0) _Py_NegativeRefcount ("Objects/frameobject.c", 459, (PyObject *)(co)); } else _Py_Dealloc ((PyObject *)(co)); } while (0);
460 | Py_TRASHCAN_SAFE_END(f)--_PyTrash_delete_nesting; if (_PyTrash_delete_later && _PyTrash_delete_nesting <= 0) _PyTrash_destroy_chain(); } else _PyTrash_deposit_object((PyObject*)f);
461 | }
462 |
463 | static int
464 | frame_traverse(PyFrameObject *f, visitproc visit, void *arg)
465 | {
466 | PyObject **fastlocals, **p;
467 | int i, slots;
468 |
469 | Py_VISIT(f->f_back)do { if (f->f_back) { int vret = visit((PyObject *)(f-> f_back), arg); if (vret) return vret; } } while (0);
470 | Py_VISIT(f->f_code)do { if (f->f_code) { int vret = visit((PyObject *)(f-> f_code), arg); if (vret) return vret; } } while (0);
471 | Py_VISIT(f->f_builtins)do { if (f->f_builtins) { int vret = visit((PyObject *)(f-> f_builtins), arg); if (vret) return vret; } } while (0);
472 | Py_VISIT(f->f_globals)do { if (f->f_globals) { int vret = visit((PyObject *)(f-> f_globals), arg); if (vret) return vret; } } while (0);
473 | Py_VISIT(f->f_locals)do { if (f->f_locals) { int vret = visit((PyObject *)(f-> f_locals), arg); if (vret) return vret; } } while (0);
474 | Py_VISIT(f->f_trace)do { if (f->f_trace) { int vret = visit((PyObject *)(f-> f_trace), arg); if (vret) return vret; } } while (0);
475 | Py_VISIT(f->f_exc_type)do { if (f->f_exc_type) { int vret = visit((PyObject *)(f-> f_exc_type), arg); if (vret) return vret; } } while (0);
476 | Py_VISIT(f->f_exc_value)do { if (f->f_exc_value) { int vret = visit((PyObject *)(f ->f_exc_value), arg); if (vret) return vret; } } while (0);
477 | Py_VISIT(f->f_exc_traceback)do { if (f->f_exc_traceback) { int vret = visit((PyObject * )(f->f_exc_traceback), arg); if (vret) return vret; } } while (0);
478 |
479 | /* locals */
480 | slots = f->f_code->co_nlocals + PyTuple_GET_SIZE(f->f_code->co_cellvars)(((PyVarObject*)(f->f_code->co_cellvars))->ob_size) + PyTuple_GET_SIZE(f->f_code->co_freevars)(((PyVarObject*)(f->f_code->co_freevars))->ob_size);
| Access to field 'co_nlocals' results in a dereference of a null pointer (loaded from field 'f_code')
481 | fastlocals = f->f_localsplus;
482 | for (i = slots; --i >= 0; ++fastlocals)
483 | Py_VISIT(*fastlocals)do { if (*fastlocals) { int vret = visit((PyObject *)(*fastlocals ), arg); if (vret) return vret; } } while (0);
484 |
485 | /* stack */
486 | if (f->f_stacktop != NULL((void*)0)) {
487 | for (p = f->f_valuestack; p < f->f_stacktop; p++)
488 | Py_VISIT(*p)do { if (*p) { int vret = visit((PyObject *)(*p), arg); if (vret ) return vret; } } while (0);
489 | }
490 | return 0;
491 | }
492 |
493 | static void
494 | frame_clear(PyFrameObject *f)
495 | {
496 | PyObject **fastlocals, **p, **oldtop;
497 | int i, slots;
498 |
499 | /* Before anything else, make sure that this frame is clearly marked
500 | * as being defunct! Else, e.g., a generator reachable from this
501 | * frame may also point to this frame, believe itself to still be
502 | * active, and try cleaning up this frame again.
503 | */
504 | oldtop = f->f_stacktop;
505 | f->f_stacktop = NULL((void*)0);
506 |
507 | Py_CLEAR(f->f_exc_type)do { if (f->f_exc_type) { PyObject *_py_tmp = (PyObject *) (f->f_exc_type); (f->f_exc_type) = ((void*)0); do { if ( _Py_RefTotal-- , --((PyObject*)(_py_tmp))->ob_refcnt != 0) { if (((PyObject*)_py_tmp)->ob_refcnt < 0) _Py_NegativeRefcount ("Objects/frameobject.c", 507, (PyObject *)(_py_tmp)); } else _Py_Dealloc((PyObject *)(_py_tmp)); } while (0); } } while ( 0);
508 | Py_CLEAR(f->f_exc_value)do { if (f->f_exc_value) { PyObject *_py_tmp = (PyObject * )(f->f_exc_value); (f->f_exc_value) = ((void*)0); do { if (_Py_RefTotal-- , --((PyObject*)(_py_tmp))->ob_refcnt != 0 ) { if (((PyObject*)_py_tmp)->ob_refcnt < 0) _Py_NegativeRefcount ("Objects/frameobject.c", 508, (PyObject *)(_py_tmp)); } else _Py_Dealloc((PyObject *)(_py_tmp)); } while (0); } } while ( 0);
509 | Py_CLEAR(f->f_exc_traceback)do { if (f->f_exc_traceback) { PyObject *_py_tmp = (PyObject *)(f->f_exc_traceback); (f->f_exc_traceback) = ((void* )0); do { if (_Py_RefTotal-- , --((PyObject*)(_py_tmp))->ob_refcnt != 0) { if (((PyObject*)_py_tmp)->ob_refcnt < 0) _Py_NegativeRefcount ("Objects/frameobject.c", 509, (PyObject *)(_py_tmp)); } else _Py_Dealloc((PyObject *)(_py_tmp)); } while (0); } } while ( 0);
510 | Py_CLEAR(f->f_trace)do { if (f->f_trace) { PyObject *_py_tmp = (PyObject *)(f-> f_trace); (f->f_trace) = ((void*)0); do { if (_Py_RefTotal -- , --((PyObject*)(_py_tmp))->ob_refcnt != 0) { if (((PyObject *)_py_tmp)->ob_refcnt < 0) _Py_NegativeRefcount("Objects/frameobject.c" , 510, (PyObject *)(_py_tmp)); } else _Py_Dealloc((PyObject * )(_py_tmp)); } while (0); } } while (0);
511 |
512 | /* locals */
513 | slots = f->f_code->co_nlocals + PyTuple_GET_SIZE(f->f_code->co_cellvars)(((PyVarObject*)(f->f_code->co_cellvars))->ob_size) + PyTuple_GET_SIZE(f->f_code->co_freevars)(((PyVarObject*)(f->f_code->co_freevars))->ob_size);
514 | fastlocals = f->f_localsplus;
515 | for (i = slots; --i >= 0; ++fastlocals)
516 | Py_CLEAR(*fastlocals)do { if (*fastlocals) { PyObject *_py_tmp = (PyObject *)(*fastlocals ); (*fastlocals) = ((void*)0); do { if (_Py_RefTotal-- , --(( PyObject*)(_py_tmp))->ob_refcnt != 0) { if (((PyObject*)_py_tmp )->ob_refcnt < 0) _Py_NegativeRefcount("Objects/frameobject.c" , 516, (PyObject *)(_py_tmp)); } else _Py_Dealloc((PyObject * )(_py_tmp)); } while (0); } } while (0);
517 |
518 | /* stack */
519 | if (oldtop != NULL((void*)0)) {
520 | for (p = f->f_valuestack; p < oldtop; p++)
521 | Py_CLEAR(*p)do { if (*p) { PyObject *_py_tmp = (PyObject *)(*p); (*p) = ( (void*)0); do { if (_Py_RefTotal-- , --((PyObject*)(_py_tmp)) ->ob_refcnt != 0) { if (((PyObject*)_py_tmp)->ob_refcnt < 0) _Py_NegativeRefcount("Objects/frameobject.c", 521, ( PyObject *)(_py_tmp)); } else _Py_Dealloc((PyObject *)(_py_tmp )); } while (0); } } while (0);
522 | }
523 | }
524 |
525 | static PyObject *
526 | frame_sizeof(PyFrameObject *f)
527 | {
528 | Py_ssize_t res, extras, ncells, nfrees;
529 |
530 | ncells = PyTuple_GET_SIZE(f->f_code->co_cellvars)(((PyVarObject*)(f->f_code->co_cellvars))->ob_size);
531 | nfrees = PyTuple_GET_SIZE(f->f_code->co_freevars)(((PyVarObject*)(f->f_code->co_freevars))->ob_size);
532 | extras = f->f_code->co_stacksize + f->f_code->co_nlocals +
533 | ncells + nfrees;
534 | /* subtract one as it is already included in PyFrameObject */
535 | res = sizeof(PyFrameObject) + (extras-1) * sizeof(PyObject *);
536 |
537 | return PyLong_FromSsize_t(res);
538 | }
539 |
540 | PyDoc_STRVAR(sizeof__doc__,static char sizeof__doc__[] = "F.__sizeof__() -> size of F in memory, in bytes"
541 | "F.__sizeof__() -> size of F in memory, in bytes")static char sizeof__doc__[] = "F.__sizeof__() -> size of F in memory, in bytes";
542 |
543 | static PyMethodDef frame_methods[] = {
544 | {"__sizeof__", (PyCFunction)frame_sizeof, METH_NOARGS0x0004,
545 | sizeof__doc__},
546 | {NULL((void*)0), NULL((void*)0)} /* sentinel */
547 | };
548 |
549 | PyTypeObject PyFrame_Type = {
550 | PyVarObject_HEAD_INIT(&PyType_Type, 0){ { 0, 0, 1, &PyType_Type }, 0 },
551 | "frame",
552 | sizeof(PyFrameObject),
553 | sizeof(PyObject *),
554 | (destructor)frame_dealloc, /* tp_dealloc */
555 | 0, /* tp_print */
556 | 0, /* tp_getattr */
557 | 0, /* tp_setattr */
558 | 0, /* tp_reserved */
559 | 0, /* tp_repr */
560 | 0, /* tp_as_number */
561 | 0, /* tp_as_sequence */
562 | 0, /* tp_as_mapping */
563 | 0, /* tp_hash */
564 | 0, /* tp_call */
565 | 0, /* tp_str */
566 | PyObject_GenericGetAttr, /* tp_getattro */
567 | PyObject_GenericSetAttr, /* tp_setattro */
568 | 0, /* tp_as_buffer */
569 | Py_TPFLAGS_DEFAULT( 0 | (1L<<18) | 0) | Py_TPFLAGS_HAVE_GC(1L<<14),/* tp_flags */
570 | 0, /* tp_doc */
571 | (traverseproc)frame_traverse, /* tp_traverse */
572 | (inquiry)frame_clear, /* tp_clear */
573 | 0, /* tp_richcompare */
574 | 0, /* tp_weaklistoffset */
575 | 0, /* tp_iter */
576 | 0, /* tp_iternext */
577 | frame_methods, /* tp_methods */
578 | frame_memberlist, /* tp_members */
579 | frame_getsetlist, /* tp_getset */
580 | 0, /* tp_base */
581 | 0, /* tp_dict */
582 | };
583 |
584 | static PyObject *builtin_object;
585 |
586 | int _PyFrame_Init()
587 | {
588 | builtin_object = PyUnicode_InternFromString("__builtins__");
589 | if (builtin_object == NULL((void*)0))
590 | return 0;
591 | return 1;
592 | }
593 |
594 | PyFrameObject *
595 | PyFrame_New(PyThreadState *tstate, PyCodeObject *code, PyObject *globals,
596 | PyObject *locals)
597 | {
598 | PyFrameObject *back = tstate->frame;
599 | PyFrameObject *f;
600 | PyObject *builtins;
601 | Py_ssize_t i;
602 |
603 | #ifdef Py_DEBUG1
604 | if (code == NULL((void*)0) || globals == NULL((void*)0) || !PyDict_Check(globals)((((((PyObject*)(globals))->ob_type))->tp_flags & ( (1L<<29))) != 0) ||
605 | (locals != NULL((void*)0) && !PyMapping_Check(locals))) {
606 | PyErr_BadInternalCall()_PyErr_BadInternalCall("Objects/frameobject.c", 606);
607 | return NULL((void*)0);
608 | }
609 | #endif
610 | if (back == NULL((void*)0) || back->f_globals != globals) {
611 | builtins = PyDict_GetItem(globals, builtin_object);
612 | if (builtins) {
613 | if (PyModule_Check(builtins)((((PyObject*)(builtins))->ob_type) == (&PyModule_Type ) || PyType_IsSubtype((((PyObject*)(builtins))->ob_type), ( &PyModule_Type)))) {
614 | builtins = PyModule_GetDict(builtins);
615 | assert(!builtins || PyDict_Check(builtins))(__builtin_expect(!(!builtins || ((((((PyObject*)(builtins))-> ob_type))->tp_flags & ((1L<<29))) != 0)), 0) ? __assert_rtn (__func__, "Objects/frameobject.c", 615, "!builtins || PyDict_Check(builtins)" ) : (void)0);
616 | }
617 | else if (!PyDict_Check(builtins)((((((PyObject*)(builtins))->ob_type))->tp_flags & ( (1L<<29))) != 0))
618 | builtins = NULL((void*)0);
619 | }
620 | if (builtins == NULL((void*)0)) {
621 | /* No builtins! Make up a minimal one
622 | Give them 'None', at least. */
623 | builtins = PyDict_New();
624 | if (builtins == NULL((void*)0) ||
625 | PyDict_SetItemString(
626 | builtins, "None", Py_None(&_Py_NoneStruct)) < 0)
627 | return NULL((void*)0);
628 | }
629 | else
630 | Py_INCREF(builtins)( _Py_RefTotal++ , ((PyObject*)(builtins))->ob_refcnt++);
631 |
632 | }
633 | else {
634 | /* If we share the globals, we share the builtins.
635 | Save a lookup and a call. */
636 | builtins = back->f_builtins;
637 | assert(builtins != NULL && PyDict_Check(builtins))(__builtin_expect(!(builtins != ((void*)0) && ((((((PyObject *)(builtins))->ob_type))->tp_flags & ((1L<<29 ))) != 0)), 0) ? __assert_rtn(__func__, "Objects/frameobject.c" , 637, "builtins != NULL && PyDict_Check(builtins)") : (void)0);
638 | Py_INCREF(builtins)( _Py_RefTotal++ , ((PyObject*)(builtins))->ob_refcnt++);
639 | }
640 | if (code->co_zombieframe != NULL((void*)0)) {
641 | f = code->co_zombieframe;
642 | code->co_zombieframe = NULL((void*)0);
643 | _Py_NewReference((PyObject *)f);
644 | assert(f->f_code == code)(__builtin_expect(!(f->f_code == code), 0) ? __assert_rtn( __func__, "Objects/frameobject.c", 644, "f->f_code == code" ) : (void)0);
645 | }
646 | else {
647 | Py_ssize_t extras, ncells, nfrees;
648 | ncells = PyTuple_GET_SIZE(code->co_cellvars)(((PyVarObject*)(code->co_cellvars))->ob_size);
649 | nfrees = PyTuple_GET_SIZE(code->co_freevars)(((PyVarObject*)(code->co_freevars))->ob_size);
650 | extras = code->co_stacksize + code->co_nlocals + ncells +
651 | nfrees;
652 | if (free_list == NULL((void*)0)) {
653 | f = PyObject_GC_NewVar(PyFrameObject, &PyFrame_Type,( (PyFrameObject *) _PyObject_GC_NewVar((&PyFrame_Type), ( extras)) )
654 | extras)( (PyFrameObject *) _PyObject_GC_NewVar((&PyFrame_Type), ( extras)) );
655 | if (f == NULL((void*)0)) {
656 | Py_DECREF(builtins)do { if (_Py_RefTotal-- , --((PyObject*)(builtins))->ob_refcnt != 0) { if (((PyObject*)builtins)->ob_refcnt < 0) _Py_NegativeRefcount ("Objects/frameobject.c", 656, (PyObject *)(builtins)); } else _Py_Dealloc((PyObject *)(builtins)); } while (0);
657 | return NULL((void*)0);
658 | }
659 | }
660 | else {
661 | assert(numfree > 0)(__builtin_expect(!(numfree > 0), 0) ? __assert_rtn(__func__ , "Objects/frameobject.c", 661, "numfree > 0") : (void)0);
662 | --numfree;
663 | f = free_list;
664 | free_list = free_list->f_back;
665 | if (Py_SIZE(f)(((PyVarObject*)(f))->ob_size) < extras) {
666 | f = PyObject_GC_Resize(PyFrameObject, f, extras)( (PyFrameObject *) _PyObject_GC_Resize((PyVarObject *)(f), ( extras)) );
667 | if (f == NULL((void*)0)) {
668 | Py_DECREF(builtins)do { if (_Py_RefTotal-- , --((PyObject*)(builtins))->ob_refcnt != 0) { if (((PyObject*)builtins)->ob_refcnt < 0) _Py_NegativeRefcount ("Objects/frameobject.c", 668, (PyObject *)(builtins)); } else _Py_Dealloc((PyObject *)(builtins)); } while (0);
669 | return NULL((void*)0);
670 | }
671 | }
672 | _Py_NewReference((PyObject *)f);
673 | }
674 |
675 | f->f_code = code;
676 | extras = code->co_nlocals + ncells + nfrees;
677 | f->f_valuestack = f->f_localsplus + extras;
678 | for (i=0; i<extras; i++)
679 | f->f_localsplus[i] = NULL((void*)0);
680 | f->f_locals = NULL((void*)0);
681 | f->f_trace = NULL((void*)0);
682 | f->f_exc_type = f->f_exc_value = f->f_exc_traceback = NULL((void*)0);
683 | }
684 | f->f_stacktop = f->f_valuestack;
685 | f->f_builtins = builtins;
686 | Py_XINCREF(back)do { if ((back) == ((void*)0)) ; else ( _Py_RefTotal++ , ((PyObject *)(back))->ob_refcnt++); } while (0);
687 | f->f_back = back;
688 | Py_INCREF(code)( _Py_RefTotal++ , ((PyObject*)(code))->ob_refcnt++);
689 | Py_INCREF(globals)( _Py_RefTotal++ , ((PyObject*)(globals))->ob_refcnt++);
690 | f->f_globals = globals;
691 | /* Most functions have CO_NEWLOCALS and CO_OPTIMIZED set. */
692 | if ((code->co_flags & (CO_NEWLOCALS0x0002 | CO_OPTIMIZED0x0001)) ==
693 | (CO_NEWLOCALS0x0002 | CO_OPTIMIZED0x0001))
694 | ; /* f_locals = NULL; will be set by PyFrame_FastToLocals() */
695 | else if (code->co_flags & CO_NEWLOCALS0x0002) {
696 | locals = PyDict_New();
697 | if (locals == NULL((void*)0)) {
698 | Py_DECREF(f)do { if (_Py_RefTotal-- , --((PyObject*)(f))->ob_refcnt != 0) { if (((PyObject*)f)->ob_refcnt < 0) _Py_NegativeRefcount ("Objects/frameobject.c", 698, (PyObject *)(f)); } else _Py_Dealloc ((PyObject *)(f)); } while (0);
699 | return NULL((void*)0);
700 | }
701 | f->f_locals = locals;
702 | }
703 | else {
704 | if (locals == NULL((void*)0))
705 | locals = globals;
706 | Py_INCREF(locals)( _Py_RefTotal++ , ((PyObject*)(locals))->ob_refcnt++);
707 | f->f_locals = locals;
708 | }
709 | f->f_tstate = tstate;
710 |
711 | f->f_lasti = -1;
712 | f->f_lineno = code->co_firstlineno;
713 | f->f_iblock = 0;
714 |
715 | _PyObject_GC_TRACK(f)do { PyGC_Head *g = ((PyGC_Head *)(f)-1); if (g->gc.gc_refs != (-2)) Py_FatalError("GC object already tracked"); g->gc .gc_refs = (-3); g->gc.gc_next = _PyGC_generation0; g-> gc.gc_prev = _PyGC_generation0->gc.gc_prev; g->gc.gc_prev ->gc.gc_next = g; _PyGC_generation0->gc.gc_prev = g; } while (0);;
716 | return f;
717 | }
718 |
719 | /* Block management */
720 |
721 | void
722 | PyFrame_BlockSetup(PyFrameObject *f, int type, int handler, int level)
723 | {
724 | PyTryBlock *b;
725 | if (f->f_iblock >= CO_MAXBLOCKS20)
726 | Py_FatalError("XXX block stack overflow");
727 | b = &f->f_blockstack[f->f_iblock++];
728 | b->b_type = type;
729 | b->b_level = level;
730 | b->b_handler = handler;
731 | }
732 |
733 | PyTryBlock *
734 | PyFrame_BlockPop(PyFrameObject *f)
735 | {
736 | PyTryBlock *b;
737 | if (f->f_iblock <= 0)
738 | Py_FatalError("XXX block stack underflow");
739 | b = &f->f_blockstack[--f->f_iblock];
740 | return b;
741 | }
742 |
743 | /* Convert between "fast" version of locals and dictionary version.
744 |
745 | map and values are input arguments. map is a tuple of strings.
746 | values is an array of PyObject*. At index i, map[i] is the name of
747 | the variable with value values[i]. The function copies the first
748 | nmap variable from map/values into dict. If values[i] is NULL,
749 | the variable is deleted from dict.
750 |
751 | If deref is true, then the values being copied are cell variables
752 | and the value is extracted from the cell variable before being put
753 | in dict.
754 |
755 | Exceptions raised while modifying the dict are silently ignored,
756 | because there is no good way to report them.
757 | */
758 |
759 | static void
760 | map_to_dict(PyObject *map, Py_ssize_t nmap, PyObject *dict, PyObject **values,
761 | int deref)
762 | {
763 | Py_ssize_t j;
764 | assert(PyTuple_Check(map))(__builtin_expect(!(((((((PyObject*)(map))->ob_type))-> tp_flags & ((1L<<26))) != 0)), 0) ? __assert_rtn(__func__ , "Objects/frameobject.c", 764, "PyTuple_Check(map)") : (void )0);
765 | assert(PyDict_Check(dict))(__builtin_expect(!(((((((PyObject*)(dict))->ob_type))-> tp_flags & ((1L<<29))) != 0)), 0) ? __assert_rtn(__func__ , "Objects/frameobject.c", 765, "PyDict_Check(dict)") : (void )0);
766 | assert(PyTuple_Size(map) >= nmap)(__builtin_expect(!(PyTuple_Size(map) >= nmap), 0) ? __assert_rtn (__func__, "Objects/frameobject.c", 766, "PyTuple_Size(map) >= nmap" ) : (void)0);
767 | for (j = nmap; --j >= 0; ) {
768 | PyObject *key = PyTuple_GET_ITEM(map, j)(((PyTupleObject *)(map))->ob_item[j]);
769 | PyObject *value = values[j];
770 | assert(PyUnicode_Check(key))(__builtin_expect(!(((((((PyObject*)(key))->ob_type))-> tp_flags & ((1L<<28))) != 0)), 0) ? __assert_rtn(__func__ , "Objects/frameobject.c", 770, "PyUnicode_Check(key)") : (void )0);
771 | if (deref) {
772 | assert(PyCell_Check(value))(__builtin_expect(!(((((PyObject*)(value))->ob_type) == & PyCell_Type)), 0) ? __assert_rtn(__func__, "Objects/frameobject.c" , 772, "PyCell_Check(value)") : (void)0);
773 | value = PyCell_GET(value)(((PyCellObject *)(value))->ob_ref);
774 | }
775 | if (value == NULL((void*)0)) {
776 | if (PyObject_DelItem(dict, key) != 0)
777 | PyErr_Clear();
778 | }
779 | else {
780 | if (PyObject_SetItem(dict, key, value) != 0)
781 | PyErr_Clear();
782 | }
783 | }
784 | }
785 |
786 | /* Copy values from the "locals" dict into the fast locals.
787 |
788 | dict is an input argument containing string keys representing
789 | variables names and arbitrary PyObject* as values.
790 |
791 | map and values are input arguments. map is a tuple of strings.
792 | values is an array of PyObject*. At index i, map[i] is the name of
793 | the variable with value values[i]. The function copies the first
794 | nmap variable from map/values into dict. If values[i] is NULL,
795 | the variable is deleted from dict.
796 |
797 | If deref is true, then the values being copied are cell variables
798 | and the value is extracted from the cell variable before being put
799 | in dict. If clear is true, then variables in map but not in dict
800 | are set to NULL in map; if clear is false, variables missing in
801 | dict are ignored.
802 |
803 | Exceptions raised while modifying the dict are silently ignored,
804 | because there is no good way to report them.
805 | */
806 |
807 | static void
808 | dict_to_map(PyObject *map, Py_ssize_t nmap, PyObject *dict, PyObject **values,
809 | int deref, int clear)
810 | {
811 | Py_ssize_t j;
812 | assert(PyTuple_Check(map))(__builtin_expect(!(((((((PyObject*)(map))->ob_type))-> tp_flags & ((1L<<26))) != 0)), 0) ? __assert_rtn(__func__ , "Objects/frameobject.c", 812, "PyTuple_Check(map)") : (void )0);
813 | assert(PyDict_Check(dict))(__builtin_expect(!(((((((PyObject*)(dict))->ob_type))-> tp_flags & ((1L<<29))) != 0)), 0) ? __assert_rtn(__func__ , "Objects/frameobject.c", 813, "PyDict_Check(dict)") : (void )0);
814 | assert(PyTuple_Size(map) >= nmap)(__builtin_expect(!(PyTuple_Size(map) >= nmap), 0) ? __assert_rtn (__func__, "Objects/frameobject.c", 814, "PyTuple_Size(map) >= nmap" ) : (void)0);
815 | for (j = nmap; --j >= 0; ) {
816 | PyObject *key = PyTuple_GET_ITEM(map, j)(((PyTupleObject *)(map))->ob_item[j]);
817 | PyObject *value = PyObject_GetItem(dict, key);
818 | assert(PyUnicode_Check(key))(__builtin_expect(!(((((((PyObject*)(key))->ob_type))-> tp_flags & ((1L<<28))) != 0)), 0) ? __assert_rtn(__func__ , "Objects/frameobject.c", 818, "PyUnicode_Check(key)") : (void )0);
819 | /* We only care about NULLs if clear is true. */
820 | if (value == NULL((void*)0)) {
821 | PyErr_Clear();
822 | if (!clear)
823 | continue;
824 | }
825 | if (deref) {
826 | assert(PyCell_Check(values[j]))(__builtin_expect(!(((((PyObject*)(values[j]))->ob_type) == &PyCell_Type)), 0) ? __assert_rtn(__func__, "Objects/frameobject.c" , 826, "PyCell_Check(values[j])") : (void)0);
827 | if (PyCell_GET(values[j])(((PyCellObject *)(values[j]))->ob_ref) != value) {
828 | if (PyCell_Set(values[j], value) < 0)
829 | PyErr_Clear();
830 | }
831 | } else if (values[j] != value) {
832 | Py_XINCREF(value)do { if ((value) == ((void*)0)) ; else ( _Py_RefTotal++ , ((PyObject *)(value))->ob_refcnt++); } while (0);
833 | Py_XDECREF(values[j])do { if ((values[j]) == ((void*)0)) ; else do { if (_Py_RefTotal -- , --((PyObject*)(values[j]))->ob_refcnt != 0) { if (((PyObject *)values[j])->ob_refcnt < 0) _Py_NegativeRefcount("Objects/frameobject.c" , 833, (PyObject *)(values[j])); } else _Py_Dealloc((PyObject *)(values[j])); } while (0); } while (0);
834 | values[j] = value;
835 | }
836 | Py_XDECREF(value)do { if ((value) == ((void*)0)) ; else do { if (_Py_RefTotal-- , --((PyObject*)(value))->ob_refcnt != 0) { if (((PyObject *)value)->ob_refcnt < 0) _Py_NegativeRefcount("Objects/frameobject.c" , 836, (PyObject *)(value)); } else _Py_Dealloc((PyObject *)( value)); } while (0); } while (0);
837 | }
838 | }
839 |
840 | void
841 | PyFrame_FastToLocals(PyFrameObject *f)
842 | {
843 | /* Merge fast locals into f->f_locals */
844 | PyObject *locals, *map;
845 | PyObject **fast;
846 | PyObject *error_type, *error_value, *error_traceback;
847 | PyCodeObject *co;
848 | Py_ssize_t j;
849 | int ncells, nfreevars;
850 | if (f == NULL((void*)0))
851 | return;
852 | locals = f->f_locals;
853 | if (locals == NULL((void*)0)) {
854 | locals = f->f_locals = PyDict_New();
855 | if (locals == NULL((void*)0)) {
856 | PyErr_Clear(); /* Can't report it :-( */
857 | return;
858 | }
859 | }
860 | co = f->f_code;
861 | map = co->co_varnames;
862 | if (!PyTuple_Check(map)((((((PyObject*)(map))->ob_type))->tp_flags & ((1L<< 26))) != 0))
863 | return;
864 | PyErr_Fetch(&error_type, &error_value, &error_traceback);
865 | fast = f->f_localsplus;
866 | j = PyTuple_GET_SIZE(map)(((PyVarObject*)(map))->ob_size);
867 | if (j > co->co_nlocals)
868 | j = co->co_nlocals;
869 | if (co->co_nlocals)
870 | map_to_dict(map, j, locals, fast, 0);
871 | ncells = PyTuple_GET_SIZE(co->co_cellvars)(((PyVarObject*)(co->co_cellvars))->ob_size);
872 | nfreevars = PyTuple_GET_SIZE(co->co_freevars)(((PyVarObject*)(co->co_freevars))->ob_size);
873 | if (ncells || nfreevars) {
874 | map_to_dict(co->co_cellvars, ncells,
875 | locals, fast + co->co_nlocals, 1);
876 | /* If the namespace is unoptimized, then one of the
877 | following cases applies:
878 | 1. It does not contain free variables, because it
879 | uses import * or is a top-level namespace.
880 | 2. It is a class namespace.
881 | We don't want to accidentally copy free variables
882 | into the locals dict used by the class.
883 | */
884 | if (co->co_flags & CO_OPTIMIZED0x0001) {
885 | map_to_dict(co->co_freevars, nfreevars,
886 | locals, fast + co->co_nlocals + ncells, 1);
887 | }
888 | }
889 | PyErr_Restore(error_type, error_value, error_traceback);
890 | }
891 |
892 | void
893 | PyFrame_LocalsToFast(PyFrameObject *f, int clear)
894 | {
895 | /* Merge f->f_locals into fast locals */
896 | PyObject *locals, *map;
897 | PyObject **fast;
898 | PyObject *error_type, *error_value, *error_traceback;
899 | PyCodeObject *co;
900 | Py_ssize_t j;
901 | int ncells, nfreevars;
902 | if (f == NULL((void*)0))
903 | return;
904 | locals = f->f_locals;
905 | co = f->f_code;
906 | map = co->co_varnames;
907 | if (locals == NULL((void*)0))
908 | return;
909 | if (!PyTuple_Check(map)((((((PyObject*)(map))->ob_type))->tp_flags & ((1L<< 26))) != 0))
910 | return;
911 | PyErr_Fetch(&error_type, &error_value, &error_traceback);
912 | fast = f->f_localsplus;
913 | j = PyTuple_GET_SIZE(map)(((PyVarObject*)(map))->ob_size);
914 | if (j > co->co_nlocals)
915 | j = co->co_nlocals;
916 | if (co->co_nlocals)
917 | dict_to_map(co->co_varnames, j, locals, fast, 0, clear);
918 | ncells = PyTuple_GET_SIZE(co->co_cellvars)(((PyVarObject*)(co->co_cellvars))->ob_size);
919 | nfreevars = PyTuple_GET_SIZE(co->co_freevars)(((PyVarObject*)(co->co_freevars))->ob_size);
920 | if (ncells || nfreevars) {
921 | dict_to_map(co->co_cellvars, ncells,
922 | locals, fast + co->co_nlocals, 1, clear);
923 | /* Same test as in PyFrame_FastToLocals() above. */
924 | if (co->co_flags & CO_OPTIMIZED0x0001) {
925 | dict_to_map(co->co_freevars, nfreevars,
926 | locals, fast + co->co_nlocals + ncells, 1,
927 | clear);
928 | }
929 | }
930 | PyErr_Restore(error_type, error_value, error_traceback);
931 | }
932 |
933 | /* Clear out the free list */
934 | int
935 | PyFrame_ClearFreeList(void)
936 | {
937 | int freelist_size = numfree;
938 |
939 | while (free_list != NULL((void*)0)) {
940 | PyFrameObject *f = free_list;
941 | free_list = free_list->f_back;
942 | PyObject_GC_Del(f);
943 | --numfree;
944 | }
945 | assert(numfree == 0)(__builtin_expect(!(numfree == 0), 0) ? __assert_rtn(__func__ , "Objects/frameobject.c", 945, "numfree == 0") : (void)0);
946 | return freelist_size;
947 | }
948 |
949 | void
950 | PyFrame_Fini(void)
951 | {
952 | (void)PyFrame_ClearFreeList();
953 | Py_XDECREF(builtin_object)do { if ((builtin_object) == ((void*)0)) ; else do { if (_Py_RefTotal -- , --((PyObject*)(builtin_object))->ob_refcnt != 0) { if (((PyObject*)builtin_object)->ob_refcnt < 0) _Py_NegativeRefcount ("Objects/frameobject.c", 953, (PyObject *)(builtin_object)); } else _Py_Dealloc((PyObject *)(builtin_object)); } while (0 ); } while (0);
954 | builtin_object = NULL((void*)0);
955 | }