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d57a3c85 TJB |
1 | /* General utility routines for GDB/Python. |
2 | ||
28e7fd62 | 3 | Copyright (C) 2008-2013 Free Software Foundation, Inc. |
d57a3c85 TJB |
4 | |
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 3 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
19 | ||
20 | #include "defs.h" | |
21 | #include "charset.h" | |
595939de | 22 | #include "value.h" |
d57a3c85 TJB |
23 | #include "python-internal.h" |
24 | ||
25 | ||
26 | /* This is a cleanup function which decrements the refcount on a | |
27 | Python object. */ | |
28 | ||
29 | static void | |
30 | py_decref (void *p) | |
31 | { | |
32 | PyObject *py = p; | |
d59b6f6c | 33 | |
c8c735b9 | 34 | Py_DECREF (py); |
d57a3c85 TJB |
35 | } |
36 | ||
37 | /* Return a new cleanup which will decrement the Python object's | |
38 | refcount when run. */ | |
39 | ||
40 | struct cleanup * | |
41 | make_cleanup_py_decref (PyObject *py) | |
42 | { | |
43 | return make_cleanup (py_decref, (void *) py); | |
44 | } | |
45 | ||
1e611234 PM |
46 | /* This is a cleanup function which decrements the refcount on a |
47 | Python object. This function accounts appropriately for NULL | |
48 | references. */ | |
49 | ||
50 | static void | |
51 | py_xdecref (void *p) | |
52 | { | |
53 | PyObject *py = p; | |
54 | ||
55 | Py_XDECREF (py); | |
56 | } | |
57 | ||
58 | /* Return a new cleanup which will decrement the Python object's | |
59 | refcount when run. Account for and operate on NULL references | |
60 | correctly. */ | |
61 | ||
62 | struct cleanup * | |
63 | make_cleanup_py_xdecref (PyObject *py) | |
64 | { | |
65 | return make_cleanup (py_xdecref, py); | |
66 | } | |
67 | ||
d57a3c85 TJB |
68 | /* Converts a Python 8-bit string to a unicode string object. Assumes the |
69 | 8-bit string is in the host charset. If an error occurs during conversion, | |
70 | returns NULL with a python exception set. | |
71 | ||
72 | As an added bonus, the functions accepts a unicode string and returns it | |
73 | right away, so callers don't need to check which kind of string they've | |
256458bc | 74 | got. In Python 3, all strings are Unicode so this case is always the |
9a27f2c6 | 75 | one that applies. |
d57a3c85 TJB |
76 | |
77 | If the given object is not one of the mentioned string types, NULL is | |
78 | returned, with the TypeError python exception set. */ | |
79 | PyObject * | |
80 | python_string_to_unicode (PyObject *obj) | |
81 | { | |
82 | PyObject *unicode_str; | |
83 | ||
84 | /* If obj is already a unicode string, just return it. | |
85 | I wish life was always that simple... */ | |
86 | if (PyUnicode_Check (obj)) | |
83390453 PM |
87 | { |
88 | unicode_str = obj; | |
89 | Py_INCREF (obj); | |
90 | } | |
9a27f2c6 | 91 | #ifndef IS_PY3K |
d57a3c85 TJB |
92 | else if (PyString_Check (obj)) |
93 | unicode_str = PyUnicode_FromEncodedObject (obj, host_charset (), NULL); | |
9a27f2c6 | 94 | #endif |
d57a3c85 TJB |
95 | else |
96 | { | |
97 | PyErr_SetString (PyExc_TypeError, | |
98 | _("Expected a string or unicode object.")); | |
99 | unicode_str = NULL; | |
100 | } | |
101 | ||
102 | return unicode_str; | |
103 | } | |
104 | ||
105 | /* Returns a newly allocated string with the contents of the given unicode | |
08c637de TJB |
106 | string object converted to CHARSET. If an error occurs during the |
107 | conversion, NULL will be returned and a python exception will be set. | |
d57a3c85 TJB |
108 | |
109 | The caller is responsible for xfree'ing the string. */ | |
08c637de TJB |
110 | static char * |
111 | unicode_to_encoded_string (PyObject *unicode_str, const char *charset) | |
d57a3c85 | 112 | { |
08c637de | 113 | char *result; |
d57a3c85 TJB |
114 | PyObject *string; |
115 | ||
08c637de TJB |
116 | /* Translate string to named charset. */ |
117 | string = PyUnicode_AsEncodedString (unicode_str, charset, NULL); | |
d57a3c85 TJB |
118 | if (string == NULL) |
119 | return NULL; | |
120 | ||
9a27f2c6 PK |
121 | #ifdef IS_PY3K |
122 | result = xstrdup (PyBytes_AsString (string)); | |
123 | #else | |
08c637de | 124 | result = xstrdup (PyString_AsString (string)); |
9a27f2c6 | 125 | #endif |
d57a3c85 TJB |
126 | |
127 | Py_DECREF (string); | |
128 | ||
08c637de TJB |
129 | return result; |
130 | } | |
131 | ||
fbb8f299 PM |
132 | /* Returns a PyObject with the contents of the given unicode string |
133 | object converted to a named charset. If an error occurs during | |
134 | the conversion, NULL will be returned and a python exception will | |
135 | be set. */ | |
136 | static PyObject * | |
137 | unicode_to_encoded_python_string (PyObject *unicode_str, const char *charset) | |
138 | { | |
fbb8f299 | 139 | /* Translate string to named charset. */ |
9a27f2c6 | 140 | return PyUnicode_AsEncodedString (unicode_str, charset, NULL); |
fbb8f299 PM |
141 | } |
142 | ||
08c637de TJB |
143 | /* Returns a newly allocated string with the contents of the given unicode |
144 | string object converted to the target's charset. If an error occurs during | |
145 | the conversion, NULL will be returned and a python exception will be set. | |
146 | ||
147 | The caller is responsible for xfree'ing the string. */ | |
148 | char * | |
149 | unicode_to_target_string (PyObject *unicode_str) | |
150 | { | |
f870a310 TT |
151 | return unicode_to_encoded_string (unicode_str, |
152 | target_charset (python_gdbarch)); | |
d57a3c85 TJB |
153 | } |
154 | ||
fbb8f299 PM |
155 | /* Returns a PyObject with the contents of the given unicode string |
156 | object converted to the target's charset. If an error occurs | |
157 | during the conversion, NULL will be returned and a python exception | |
158 | will be set. */ | |
49a8461d | 159 | static PyObject * |
fbb8f299 PM |
160 | unicode_to_target_python_string (PyObject *unicode_str) |
161 | { | |
f870a310 TT |
162 | return unicode_to_encoded_python_string (unicode_str, |
163 | target_charset (python_gdbarch)); | |
fbb8f299 PM |
164 | } |
165 | ||
d57a3c85 TJB |
166 | /* Converts a python string (8-bit or unicode) to a target string in |
167 | the target's charset. Returns NULL on error, with a python exception set. | |
168 | ||
169 | The caller is responsible for xfree'ing the string. */ | |
170 | char * | |
171 | python_string_to_target_string (PyObject *obj) | |
172 | { | |
173 | PyObject *str; | |
83390453 | 174 | char *result; |
d57a3c85 TJB |
175 | |
176 | str = python_string_to_unicode (obj); | |
177 | if (str == NULL) | |
178 | return NULL; | |
179 | ||
83390453 PM |
180 | result = unicode_to_target_string (str); |
181 | Py_DECREF (str); | |
182 | return result; | |
d57a3c85 | 183 | } |
08c637de | 184 | |
fbb8f299 PM |
185 | /* Converts a python string (8-bit or unicode) to a target string in the |
186 | target's charset. Returns NULL on error, with a python exception | |
9a27f2c6 PK |
187 | set. |
188 | ||
189 | In Python 3, the returned object is a "bytes" object (not a string). */ | |
fbb8f299 PM |
190 | PyObject * |
191 | python_string_to_target_python_string (PyObject *obj) | |
192 | { | |
193 | PyObject *str; | |
194 | PyObject *result; | |
195 | ||
196 | str = python_string_to_unicode (obj); | |
197 | if (str == NULL) | |
198 | return NULL; | |
199 | ||
200 | result = unicode_to_target_python_string (str); | |
201 | Py_DECREF (str); | |
202 | return result; | |
203 | } | |
204 | ||
08c637de TJB |
205 | /* Converts a python string (8-bit or unicode) to a target string in |
206 | the host's charset. Returns NULL on error, with a python exception set. | |
207 | ||
208 | The caller is responsible for xfree'ing the string. */ | |
209 | char * | |
210 | python_string_to_host_string (PyObject *obj) | |
211 | { | |
212 | PyObject *str; | |
83390453 | 213 | char *result; |
08c637de TJB |
214 | |
215 | str = python_string_to_unicode (obj); | |
216 | if (str == NULL) | |
217 | return NULL; | |
218 | ||
256458bc | 219 | result = unicode_to_encoded_string (str, host_charset ()); |
83390453 PM |
220 | Py_DECREF (str); |
221 | return result; | |
08c637de TJB |
222 | } |
223 | ||
224 | /* Return true if OBJ is a Python string or unicode object, false | |
225 | otherwise. */ | |
226 | ||
227 | int | |
228 | gdbpy_is_string (PyObject *obj) | |
229 | { | |
9a27f2c6 PK |
230 | #ifdef IS_PY3K |
231 | return PyUnicode_Check (obj); | |
232 | #else | |
08c637de | 233 | return PyString_Check (obj) || PyUnicode_Check (obj); |
9a27f2c6 | 234 | #endif |
08c637de | 235 | } |
07ca107c DE |
236 | |
237 | /* Return the string representation of OBJ, i.e., str (obj). | |
238 | Space for the result is malloc'd, the caller must free. | |
239 | If the result is NULL a python error occurred, the caller must clear it. */ | |
240 | ||
241 | char * | |
242 | gdbpy_obj_to_string (PyObject *obj) | |
243 | { | |
244 | PyObject *str_obj = PyObject_Str (obj); | |
245 | ||
246 | if (str_obj != NULL) | |
247 | { | |
9a27f2c6 PK |
248 | #ifdef IS_PY3K |
249 | char *msg = python_string_to_host_string (str_obj); | |
250 | #else | |
07ca107c | 251 | char *msg = xstrdup (PyString_AsString (str_obj)); |
9a27f2c6 | 252 | #endif |
07ca107c DE |
253 | |
254 | Py_DECREF (str_obj); | |
255 | return msg; | |
256 | } | |
257 | ||
258 | return NULL; | |
259 | } | |
260 | ||
261 | /* Return the string representation of the exception represented by | |
262 | TYPE, VALUE which is assumed to have been obtained with PyErr_Fetch, | |
263 | i.e., the error indicator is currently clear. | |
264 | Space for the result is malloc'd, the caller must free. | |
265 | If the result is NULL a python error occurred, the caller must clear it. */ | |
266 | ||
267 | char * | |
268 | gdbpy_exception_to_string (PyObject *ptype, PyObject *pvalue) | |
269 | { | |
07ca107c DE |
270 | char *str; |
271 | ||
272 | /* There are a few cases to consider. | |
273 | For example: | |
274 | pvalue is a string when PyErr_SetString is used. | |
275 | pvalue is not a string when raise "foo" is used, instead it is None | |
276 | and ptype is "foo". | |
277 | So the algorithm we use is to print `str (pvalue)' if it's not | |
278 | None, otherwise we print `str (ptype)'. | |
279 | Using str (aka PyObject_Str) will fetch the error message from | |
280 | gdb.GdbError ("message"). */ | |
281 | ||
282 | if (pvalue && pvalue != Py_None) | |
283 | str = gdbpy_obj_to_string (pvalue); | |
284 | else | |
285 | str = gdbpy_obj_to_string (ptype); | |
286 | ||
287 | return str; | |
288 | } | |
595939de | 289 | |
621c8364 | 290 | /* Convert a GDB exception to the appropriate Python exception. |
256458bc | 291 | |
56cc411c | 292 | This sets the Python error indicator. */ |
621c8364 | 293 | |
56cc411c | 294 | void |
621c8364 TT |
295 | gdbpy_convert_exception (struct gdb_exception exception) |
296 | { | |
297 | PyObject *exc_class; | |
298 | ||
299 | if (exception.reason == RETURN_QUIT) | |
300 | exc_class = PyExc_KeyboardInterrupt; | |
301 | else if (exception.error == MEMORY_ERROR) | |
302 | exc_class = gdbpy_gdb_memory_error; | |
303 | else | |
304 | exc_class = gdbpy_gdb_error; | |
305 | ||
56cc411c | 306 | PyErr_Format (exc_class, "%s", exception.message); |
621c8364 TT |
307 | } |
308 | ||
595939de PM |
309 | /* Converts OBJ to a CORE_ADDR value. |
310 | ||
b86af38a | 311 | Returns 0 on success or -1 on failure, with a Python exception set. |
595939de PM |
312 | */ |
313 | ||
314 | int | |
315 | get_addr_from_python (PyObject *obj, CORE_ADDR *addr) | |
316 | { | |
317 | if (gdbpy_is_value_object (obj)) | |
b86af38a TT |
318 | { |
319 | volatile struct gdb_exception except; | |
320 | ||
321 | TRY_CATCH (except, RETURN_MASK_ALL) | |
322 | { | |
323 | *addr = value_as_address (value_object_to_value (obj)); | |
324 | } | |
325 | GDB_PY_SET_HANDLE_EXCEPTION (except); | |
326 | } | |
74aedc46 | 327 | else |
595939de | 328 | { |
74aedc46 TT |
329 | PyObject *num = PyNumber_Long (obj); |
330 | gdb_py_ulongest val; | |
331 | ||
332 | if (num == NULL) | |
b86af38a | 333 | return -1; |
595939de | 334 | |
74aedc46 TT |
335 | val = gdb_py_long_as_ulongest (num); |
336 | Py_XDECREF (num); | |
337 | if (PyErr_Occurred ()) | |
b86af38a | 338 | return -1; |
595939de | 339 | |
74aedc46 TT |
340 | if (sizeof (val) > sizeof (CORE_ADDR) && ((CORE_ADDR) val) != val) |
341 | { | |
342 | PyErr_SetString (PyExc_ValueError, | |
343 | _("Overflow converting to address.")); | |
b86af38a | 344 | return -1; |
74aedc46 | 345 | } |
595939de | 346 | |
74aedc46 | 347 | *addr = val; |
595939de PM |
348 | } |
349 | ||
b86af38a | 350 | return 0; |
595939de | 351 | } |
74aedc46 TT |
352 | |
353 | /* Convert a LONGEST to the appropriate Python object -- either an | |
354 | integer object or a long object, depending on its value. */ | |
355 | ||
356 | PyObject * | |
357 | gdb_py_object_from_longest (LONGEST l) | |
358 | { | |
9a27f2c6 PK |
359 | #ifdef IS_PY3K |
360 | if (sizeof (l) > sizeof (long)) | |
361 | return PyLong_FromLongLong (l); | |
362 | return PyLong_FromLong (l); | |
363 | #else | |
74aedc46 TT |
364 | #ifdef HAVE_LONG_LONG /* Defined by Python. */ |
365 | /* If we have 'long long', and the value overflows a 'long', use a | |
366 | Python Long; otherwise use a Python Int. */ | |
367 | if (sizeof (l) > sizeof (long) | |
368 | && (l > PyInt_GetMax () || l < (- (LONGEST) PyInt_GetMax ()) - 1)) | |
369 | return PyLong_FromLongLong (l); | |
370 | #endif | |
371 | return PyInt_FromLong (l); | |
9a27f2c6 | 372 | #endif |
74aedc46 TT |
373 | } |
374 | ||
375 | /* Convert a ULONGEST to the appropriate Python object -- either an | |
376 | integer object or a long object, depending on its value. */ | |
377 | ||
378 | PyObject * | |
379 | gdb_py_object_from_ulongest (ULONGEST l) | |
380 | { | |
9a27f2c6 PK |
381 | #ifdef IS_PY3K |
382 | if (sizeof (l) > sizeof (unsigned long)) | |
383 | return PyLong_FromUnsignedLongLong (l); | |
384 | return PyLong_FromUnsignedLong (l); | |
385 | #else | |
74aedc46 TT |
386 | #ifdef HAVE_LONG_LONG /* Defined by Python. */ |
387 | /* If we have 'long long', and the value overflows a 'long', use a | |
388 | Python Long; otherwise use a Python Int. */ | |
389 | if (sizeof (l) > sizeof (unsigned long) && l > PyInt_GetMax ()) | |
390 | return PyLong_FromUnsignedLongLong (l); | |
391 | #endif | |
392 | ||
393 | if (l > PyInt_GetMax ()) | |
394 | return PyLong_FromUnsignedLong (l); | |
395 | ||
396 | return PyInt_FromLong (l); | |
9a27f2c6 | 397 | #endif |
74aedc46 TT |
398 | } |
399 | ||
400 | /* Like PyInt_AsLong, but returns 0 on failure, 1 on success, and puts | |
401 | the value into an out parameter. */ | |
402 | ||
403 | int | |
404 | gdb_py_int_as_long (PyObject *obj, long *result) | |
405 | { | |
406 | *result = PyInt_AsLong (obj); | |
407 | return ! (*result == -1 && PyErr_Occurred ()); | |
408 | } | |
2e8265fd TT |
409 | |
410 | \f | |
411 | ||
412 | /* Generic implementation of the __dict__ attribute for objects that | |
413 | have a dictionary. The CLOSURE argument should be the type object. | |
414 | This only handles positive values for tp_dictoffset. */ | |
415 | ||
416 | PyObject * | |
417 | gdb_py_generic_dict (PyObject *self, void *closure) | |
418 | { | |
419 | PyObject *result; | |
420 | PyTypeObject *type_obj = closure; | |
421 | char *raw_ptr; | |
422 | ||
423 | raw_ptr = (char *) self + type_obj->tp_dictoffset; | |
424 | result = * (PyObject **) raw_ptr; | |
425 | ||
426 | Py_INCREF (result); | |
427 | return result; | |
428 | } | |
aa36459a TT |
429 | |
430 | /* Like PyModule_AddObject, but does not steal a reference to | |
431 | OBJECT. */ | |
432 | ||
433 | int | |
434 | gdb_pymodule_addobject (PyObject *module, const char *name, PyObject *object) | |
435 | { | |
436 | int result; | |
437 | ||
438 | Py_INCREF (object); | |
351a6f02 TT |
439 | /* Python 2.4 did not have a 'const' here. */ |
440 | result = PyModule_AddObject (module, (char *) name, object); | |
aa36459a | 441 | if (result < 0) |
1915daeb | 442 | Py_DECREF (object); |
aa36459a TT |
443 | return result; |
444 | } |