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