| /* General utility routines for GDB/Python. |
| |
| Copyright (C) 2008-2012 Free Software Foundation, Inc. |
| |
| This file is part of GDB. |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 3 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| |
| #include "defs.h" |
| #include "charset.h" |
| #include "value.h" |
| #include "python-internal.h" |
| |
| |
| /* This is a cleanup function which decrements the refcount on a |
| Python object. */ |
| |
| static void |
| py_decref (void *p) |
| { |
| PyObject *py = p; |
| |
| /* Note that we need the extra braces in this 'if' to avoid a |
| warning from gcc. */ |
| if (py) |
| { |
| Py_DECREF (py); |
| } |
| } |
| |
| /* Return a new cleanup which will decrement the Python object's |
| refcount when run. */ |
| |
| struct cleanup * |
| make_cleanup_py_decref (PyObject *py) |
| { |
| return make_cleanup (py_decref, (void *) py); |
| } |
| |
| /* Converts a Python 8-bit string to a unicode string object. Assumes the |
| 8-bit string is in the host charset. If an error occurs during conversion, |
| returns NULL with a python exception set. |
| |
| As an added bonus, the functions accepts a unicode string and returns it |
| right away, so callers don't need to check which kind of string they've |
| got. |
| |
| If the given object is not one of the mentioned string types, NULL is |
| returned, with the TypeError python exception set. */ |
| PyObject * |
| python_string_to_unicode (PyObject *obj) |
| { |
| PyObject *unicode_str; |
| |
| /* If obj is already a unicode string, just return it. |
| I wish life was always that simple... */ |
| if (PyUnicode_Check (obj)) |
| { |
| unicode_str = obj; |
| Py_INCREF (obj); |
| } |
| |
| else if (PyString_Check (obj)) |
| unicode_str = PyUnicode_FromEncodedObject (obj, host_charset (), NULL); |
| else |
| { |
| PyErr_SetString (PyExc_TypeError, |
| _("Expected a string or unicode object.")); |
| unicode_str = NULL; |
| } |
| |
| return unicode_str; |
| } |
| |
| /* Returns a newly allocated string with the contents of the given unicode |
| string object converted to CHARSET. If an error occurs during the |
| conversion, NULL will be returned and a python exception will be set. |
| |
| The caller is responsible for xfree'ing the string. */ |
| static char * |
| unicode_to_encoded_string (PyObject *unicode_str, const char *charset) |
| { |
| char *result; |
| PyObject *string; |
| |
| /* Translate string to named charset. */ |
| string = PyUnicode_AsEncodedString (unicode_str, charset, NULL); |
| if (string == NULL) |
| return NULL; |
| |
| result = xstrdup (PyString_AsString (string)); |
| |
| Py_DECREF (string); |
| |
| return result; |
| } |
| |
| /* Returns a PyObject with the contents of the given unicode string |
| object converted to a named charset. If an error occurs during |
| the conversion, NULL will be returned and a python exception will |
| be set. */ |
| static PyObject * |
| unicode_to_encoded_python_string (PyObject *unicode_str, const char *charset) |
| { |
| PyObject *string; |
| |
| /* Translate string to named charset. */ |
| string = PyUnicode_AsEncodedString (unicode_str, charset, NULL); |
| if (string == NULL) |
| return NULL; |
| |
| return string; |
| } |
| |
| /* Returns a newly allocated string with the contents of the given unicode |
| string object converted to the target's charset. If an error occurs during |
| the conversion, NULL will be returned and a python exception will be set. |
| |
| The caller is responsible for xfree'ing the string. */ |
| char * |
| unicode_to_target_string (PyObject *unicode_str) |
| { |
| return unicode_to_encoded_string (unicode_str, |
| target_charset (python_gdbarch)); |
| } |
| |
| /* Returns a PyObject with the contents of the given unicode string |
| object converted to the target's charset. If an error occurs |
| during the conversion, NULL will be returned and a python exception |
| will be set. */ |
| static PyObject * |
| unicode_to_target_python_string (PyObject *unicode_str) |
| { |
| return unicode_to_encoded_python_string (unicode_str, |
| target_charset (python_gdbarch)); |
| } |
| |
| /* Converts a python string (8-bit or unicode) to a target string in |
| the target's charset. Returns NULL on error, with a python exception set. |
| |
| The caller is responsible for xfree'ing the string. */ |
| char * |
| python_string_to_target_string (PyObject *obj) |
| { |
| PyObject *str; |
| char *result; |
| |
| str = python_string_to_unicode (obj); |
| if (str == NULL) |
| return NULL; |
| |
| result = unicode_to_target_string (str); |
| Py_DECREF (str); |
| return result; |
| } |
| |
| /* Converts a python string (8-bit or unicode) to a target string in the |
| target's charset. Returns NULL on error, with a python exception |
| set. */ |
| PyObject * |
| python_string_to_target_python_string (PyObject *obj) |
| { |
| PyObject *str; |
| PyObject *result; |
| |
| str = python_string_to_unicode (obj); |
| if (str == NULL) |
| return NULL; |
| |
| result = unicode_to_target_python_string (str); |
| Py_DECREF (str); |
| return result; |
| } |
| |
| /* Converts a python string (8-bit or unicode) to a target string in |
| the host's charset. Returns NULL on error, with a python exception set. |
| |
| The caller is responsible for xfree'ing the string. */ |
| char * |
| python_string_to_host_string (PyObject *obj) |
| { |
| PyObject *str; |
| char *result; |
| |
| str = python_string_to_unicode (obj); |
| if (str == NULL) |
| return NULL; |
| |
| result = unicode_to_encoded_string (str, host_charset ()); |
| Py_DECREF (str); |
| return result; |
| } |
| |
| /* Converts a target string of LENGTH bytes in the target's charset to a |
| Python Unicode string. If LENGTH is -1, convert until a null byte is found. |
| |
| Returns NULL on error, with a python exception set. */ |
| PyObject * |
| target_string_to_unicode (const gdb_byte *str, int length) |
| { |
| if (length == -1) |
| length = strlen (str); |
| |
| return PyUnicode_Decode (str, length, target_charset (python_gdbarch), NULL); |
| } |
| |
| /* Return true if OBJ is a Python string or unicode object, false |
| otherwise. */ |
| |
| int |
| gdbpy_is_string (PyObject *obj) |
| { |
| return PyString_Check (obj) || PyUnicode_Check (obj); |
| } |
| |
| /* Return the string representation of OBJ, i.e., str (obj). |
| Space for the result is malloc'd, the caller must free. |
| If the result is NULL a python error occurred, the caller must clear it. */ |
| |
| char * |
| gdbpy_obj_to_string (PyObject *obj) |
| { |
| PyObject *str_obj = PyObject_Str (obj); |
| |
| if (str_obj != NULL) |
| { |
| char *msg = xstrdup (PyString_AsString (str_obj)); |
| |
| Py_DECREF (str_obj); |
| return msg; |
| } |
| |
| return NULL; |
| } |
| |
| /* Return the string representation of the exception represented by |
| TYPE, VALUE which is assumed to have been obtained with PyErr_Fetch, |
| i.e., the error indicator is currently clear. |
| Space for the result is malloc'd, the caller must free. |
| If the result is NULL a python error occurred, the caller must clear it. */ |
| |
| char * |
| gdbpy_exception_to_string (PyObject *ptype, PyObject *pvalue) |
| { |
| char *str; |
| |
| /* There are a few cases to consider. |
| For example: |
| pvalue is a string when PyErr_SetString is used. |
| pvalue is not a string when raise "foo" is used, instead it is None |
| and ptype is "foo". |
| So the algorithm we use is to print `str (pvalue)' if it's not |
| None, otherwise we print `str (ptype)'. |
| Using str (aka PyObject_Str) will fetch the error message from |
| gdb.GdbError ("message"). */ |
| |
| if (pvalue && pvalue != Py_None) |
| str = gdbpy_obj_to_string (pvalue); |
| else |
| str = gdbpy_obj_to_string (ptype); |
| |
| return str; |
| } |
| |
| /* Convert a GDB exception to the appropriate Python exception. |
| |
| This sets the Python error indicator, and returns NULL. */ |
| |
| PyObject * |
| gdbpy_convert_exception (struct gdb_exception exception) |
| { |
| PyObject *exc_class; |
| |
| if (exception.reason == RETURN_QUIT) |
| exc_class = PyExc_KeyboardInterrupt; |
| else if (exception.error == MEMORY_ERROR) |
| exc_class = gdbpy_gdb_memory_error; |
| else |
| exc_class = gdbpy_gdb_error; |
| |
| return PyErr_Format (exc_class, "%s", exception.message); |
| } |
| |
| /* Converts OBJ to a CORE_ADDR value. |
| |
| Returns 1 on success or 0 on failure, with a Python exception set. This |
| function can also throw GDB exceptions. |
| */ |
| |
| int |
| get_addr_from_python (PyObject *obj, CORE_ADDR *addr) |
| { |
| if (gdbpy_is_value_object (obj)) |
| *addr = value_as_address (value_object_to_value (obj)); |
| else |
| { |
| PyObject *num = PyNumber_Long (obj); |
| gdb_py_ulongest val; |
| |
| if (num == NULL) |
| return 0; |
| |
| val = gdb_py_long_as_ulongest (num); |
| Py_XDECREF (num); |
| if (PyErr_Occurred ()) |
| return 0; |
| |
| if (sizeof (val) > sizeof (CORE_ADDR) && ((CORE_ADDR) val) != val) |
| { |
| PyErr_SetString (PyExc_ValueError, |
| _("Overflow converting to address.")); |
| return 0; |
| } |
| |
| *addr = val; |
| } |
| |
| return 1; |
| } |
| |
| /* Convert a LONGEST to the appropriate Python object -- either an |
| integer object or a long object, depending on its value. */ |
| |
| PyObject * |
| gdb_py_object_from_longest (LONGEST l) |
| { |
| #ifdef HAVE_LONG_LONG /* Defined by Python. */ |
| /* If we have 'long long', and the value overflows a 'long', use a |
| Python Long; otherwise use a Python Int. */ |
| if (sizeof (l) > sizeof (long) |
| && (l > PyInt_GetMax () || l < (- (LONGEST) PyInt_GetMax ()) - 1)) |
| return PyLong_FromLongLong (l); |
| #endif |
| return PyInt_FromLong (l); |
| } |
| |
| /* Convert a ULONGEST to the appropriate Python object -- either an |
| integer object or a long object, depending on its value. */ |
| |
| PyObject * |
| gdb_py_object_from_ulongest (ULONGEST l) |
| { |
| #ifdef HAVE_LONG_LONG /* Defined by Python. */ |
| /* If we have 'long long', and the value overflows a 'long', use a |
| Python Long; otherwise use a Python Int. */ |
| if (sizeof (l) > sizeof (unsigned long) && l > PyInt_GetMax ()) |
| return PyLong_FromUnsignedLongLong (l); |
| #endif |
| |
| if (l > PyInt_GetMax ()) |
| return PyLong_FromUnsignedLong (l); |
| |
| return PyInt_FromLong (l); |
| } |
| |
| /* Like PyInt_AsLong, but returns 0 on failure, 1 on success, and puts |
| the value into an out parameter. */ |
| |
| int |
| gdb_py_int_as_long (PyObject *obj, long *result) |
| { |
| *result = PyInt_AsLong (obj); |
| return ! (*result == -1 && PyErr_Occurred ()); |
| } |
| |
| |
| |
| /* Generic implementation of the __dict__ attribute for objects that |
| have a dictionary. The CLOSURE argument should be the type object. |
| This only handles positive values for tp_dictoffset. */ |
| |
| PyObject * |
| gdb_py_generic_dict (PyObject *self, void *closure) |
| { |
| PyObject *result; |
| PyTypeObject *type_obj = closure; |
| char *raw_ptr; |
| |
| raw_ptr = (char *) self + type_obj->tp_dictoffset; |
| result = * (PyObject **) raw_ptr; |
| |
| Py_INCREF (result); |
| return result; |
| } |