1 /* General utility routines for GDB/Python.
3 Copyright (C) 2008-2012 Free Software Foundation, Inc.
5 This file is part of GDB.
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.
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.
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/>. */
23 #include "python-internal.h"
26 /* This is a cleanup function which decrements the refcount on a
34 /* Note that we need the extra braces in this 'if' to avoid a
42 /* Return a new cleanup which will decrement the Python object's
46 make_cleanup_py_decref (PyObject *py)
48 return make_cleanup (py_decref, (void *) py);
51 /* Converts a Python 8-bit string to a unicode string object. Assumes the
52 8-bit string is in the host charset. If an error occurs during conversion,
53 returns NULL with a python exception set.
55 As an added bonus, the functions accepts a unicode string and returns it
56 right away, so callers don't need to check which kind of string they've
57 got. In Python 3, all strings are Unicode so this case is always the
60 If the given object is not one of the mentioned string types, NULL is
61 returned, with the TypeError python exception set. */
63 python_string_to_unicode (PyObject *obj)
65 PyObject *unicode_str;
67 /* If obj is already a unicode string, just return it.
68 I wish life was always that simple... */
69 if (PyUnicode_Check (obj))
75 else if (PyString_Check (obj))
76 unicode_str = PyUnicode_FromEncodedObject (obj, host_charset (), NULL);
80 PyErr_SetString (PyExc_TypeError,
81 _("Expected a string or unicode object."));
88 /* Returns a newly allocated string with the contents of the given unicode
89 string object converted to CHARSET. If an error occurs during the
90 conversion, NULL will be returned and a python exception will be set.
92 The caller is responsible for xfree'ing the string. */
94 unicode_to_encoded_string (PyObject *unicode_str, const char *charset)
99 /* Translate string to named charset. */
100 string = PyUnicode_AsEncodedString (unicode_str, charset, NULL);
105 result = xstrdup (PyBytes_AsString (string));
107 result = xstrdup (PyString_AsString (string));
115 /* Returns a PyObject with the contents of the given unicode string
116 object converted to a named charset. If an error occurs during
117 the conversion, NULL will be returned and a python exception will
120 unicode_to_encoded_python_string (PyObject *unicode_str, const char *charset)
122 /* Translate string to named charset. */
123 return PyUnicode_AsEncodedString (unicode_str, charset, NULL);
126 /* Returns a newly allocated string with the contents of the given unicode
127 string object converted to the target's charset. If an error occurs during
128 the conversion, NULL will be returned and a python exception will be set.
130 The caller is responsible for xfree'ing the string. */
132 unicode_to_target_string (PyObject *unicode_str)
134 return unicode_to_encoded_string (unicode_str,
135 target_charset (python_gdbarch));
138 /* Returns a PyObject with the contents of the given unicode string
139 object converted to the target's charset. If an error occurs
140 during the conversion, NULL will be returned and a python exception
143 unicode_to_target_python_string (PyObject *unicode_str)
145 return unicode_to_encoded_python_string (unicode_str,
146 target_charset (python_gdbarch));
149 /* Converts a python string (8-bit or unicode) to a target string in
150 the target's charset. Returns NULL on error, with a python exception set.
152 The caller is responsible for xfree'ing the string. */
154 python_string_to_target_string (PyObject *obj)
159 str = python_string_to_unicode (obj);
163 result = unicode_to_target_string (str);
168 /* Converts a python string (8-bit or unicode) to a target string in the
169 target's charset. Returns NULL on error, with a python exception
172 In Python 3, the returned object is a "bytes" object (not a string). */
174 python_string_to_target_python_string (PyObject *obj)
179 str = python_string_to_unicode (obj);
183 result = unicode_to_target_python_string (str);
188 /* Converts a python string (8-bit or unicode) to a target string in
189 the host's charset. Returns NULL on error, with a python exception set.
191 The caller is responsible for xfree'ing the string. */
193 python_string_to_host_string (PyObject *obj)
198 str = python_string_to_unicode (obj);
202 result = unicode_to_encoded_string (str, host_charset ());
207 /* Converts a target string of LENGTH bytes in the target's charset to a
208 Python Unicode string. If LENGTH is -1, convert until a null byte is found.
210 Returns NULL on error, with a python exception set. */
212 target_string_to_unicode (const gdb_byte *str, int length)
215 length = strlen (str);
217 return PyUnicode_Decode (str, length, target_charset (python_gdbarch), NULL);
220 /* Return true if OBJ is a Python string or unicode object, false
224 gdbpy_is_string (PyObject *obj)
227 return PyUnicode_Check (obj);
229 return PyString_Check (obj) || PyUnicode_Check (obj);
233 /* Return the string representation of OBJ, i.e., str (obj).
234 Space for the result is malloc'd, the caller must free.
235 If the result is NULL a python error occurred, the caller must clear it. */
238 gdbpy_obj_to_string (PyObject *obj)
240 PyObject *str_obj = PyObject_Str (obj);
245 char *msg = python_string_to_host_string (str_obj);
247 char *msg = xstrdup (PyString_AsString (str_obj));
257 /* Return the string representation of the exception represented by
258 TYPE, VALUE which is assumed to have been obtained with PyErr_Fetch,
259 i.e., the error indicator is currently clear.
260 Space for the result is malloc'd, the caller must free.
261 If the result is NULL a python error occurred, the caller must clear it. */
264 gdbpy_exception_to_string (PyObject *ptype, PyObject *pvalue)
268 /* There are a few cases to consider.
270 pvalue is a string when PyErr_SetString is used.
271 pvalue is not a string when raise "foo" is used, instead it is None
273 So the algorithm we use is to print `str (pvalue)' if it's not
274 None, otherwise we print `str (ptype)'.
275 Using str (aka PyObject_Str) will fetch the error message from
276 gdb.GdbError ("message"). */
278 if (pvalue && pvalue != Py_None)
279 str = gdbpy_obj_to_string (pvalue);
281 str = gdbpy_obj_to_string (ptype);
286 /* Convert a GDB exception to the appropriate Python exception.
288 This sets the Python error indicator, and returns NULL. */
291 gdbpy_convert_exception (struct gdb_exception exception)
295 if (exception.reason == RETURN_QUIT)
296 exc_class = PyExc_KeyboardInterrupt;
297 else if (exception.error == MEMORY_ERROR)
298 exc_class = gdbpy_gdb_memory_error;
300 exc_class = gdbpy_gdb_error;
302 return PyErr_Format (exc_class, "%s", exception.message);
305 /* Converts OBJ to a CORE_ADDR value.
307 Returns 1 on success or 0 on failure, with a Python exception set. This
308 function can also throw GDB exceptions.
312 get_addr_from_python (PyObject *obj, CORE_ADDR *addr)
314 if (gdbpy_is_value_object (obj))
315 *addr = value_as_address (value_object_to_value (obj));
318 PyObject *num = PyNumber_Long (obj);
324 val = gdb_py_long_as_ulongest (num);
326 if (PyErr_Occurred ())
329 if (sizeof (val) > sizeof (CORE_ADDR) && ((CORE_ADDR) val) != val)
331 PyErr_SetString (PyExc_ValueError,
332 _("Overflow converting to address."));
342 /* Convert a LONGEST to the appropriate Python object -- either an
343 integer object or a long object, depending on its value. */
346 gdb_py_object_from_longest (LONGEST l)
349 if (sizeof (l) > sizeof (long))
350 return PyLong_FromLongLong (l);
351 return PyLong_FromLong (l);
353 #ifdef HAVE_LONG_LONG /* Defined by Python. */
354 /* If we have 'long long', and the value overflows a 'long', use a
355 Python Long; otherwise use a Python Int. */
356 if (sizeof (l) > sizeof (long)
357 && (l > PyInt_GetMax () || l < (- (LONGEST) PyInt_GetMax ()) - 1))
358 return PyLong_FromLongLong (l);
360 return PyInt_FromLong (l);
364 /* Convert a ULONGEST to the appropriate Python object -- either an
365 integer object or a long object, depending on its value. */
368 gdb_py_object_from_ulongest (ULONGEST l)
371 if (sizeof (l) > sizeof (unsigned long))
372 return PyLong_FromUnsignedLongLong (l);
373 return PyLong_FromUnsignedLong (l);
375 #ifdef HAVE_LONG_LONG /* Defined by Python. */
376 /* If we have 'long long', and the value overflows a 'long', use a
377 Python Long; otherwise use a Python Int. */
378 if (sizeof (l) > sizeof (unsigned long) && l > PyInt_GetMax ())
379 return PyLong_FromUnsignedLongLong (l);
382 if (l > PyInt_GetMax ())
383 return PyLong_FromUnsignedLong (l);
385 return PyInt_FromLong (l);
389 /* Like PyInt_AsLong, but returns 0 on failure, 1 on success, and puts
390 the value into an out parameter. */
393 gdb_py_int_as_long (PyObject *obj, long *result)
395 *result = PyInt_AsLong (obj);
396 return ! (*result == -1 && PyErr_Occurred ());
401 /* Generic implementation of the __dict__ attribute for objects that
402 have a dictionary. The CLOSURE argument should be the type object.
403 This only handles positive values for tp_dictoffset. */
406 gdb_py_generic_dict (PyObject *self, void *closure)
409 PyTypeObject *type_obj = closure;
412 raw_ptr = (char *) self + type_obj->tp_dictoffset;
413 result = * (PyObject **) raw_ptr;