427 lines
12 KiB
C
427 lines
12 KiB
C
/* General utility routines for GDB/Python.
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Copyright (C) 2008-2020 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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/* 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. In Python 3, all strings are Unicode so this case is always the
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one that applies.
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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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gdbpy_ref<>
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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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#ifndef IS_PY3K
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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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#endif
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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 gdbpy_ref<> (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
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set. */
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static gdb::unique_xmalloc_ptr<char>
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unicode_to_encoded_string (PyObject *unicode_str, const char *charset)
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{
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/* Translate string to named charset. */
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gdbpy_ref<> 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 gdb::unique_xmalloc_ptr<char>
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(xstrdup (PyBytes_AsString (string.get ())));
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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 gdbpy_ref<>
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unicode_to_encoded_python_string (PyObject *unicode_str, const char *charset)
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{
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/* Translate string to named charset. */
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return gdbpy_ref<> (PyUnicode_AsEncodedString (unicode_str, charset, NULL));
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}
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/* Returns a newly allocated string with the contents of the given
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unicode string object converted to the target's charset. If an
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error occurs during the conversion, NULL will be returned and a
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python exception will be set. */
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gdb::unique_xmalloc_ptr<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 gdbpy_ref<>
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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
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exception set. */
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gdb::unique_xmalloc_ptr<char>
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python_string_to_target_string (PyObject *obj)
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{
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gdbpy_ref<> str = python_string_to_unicode (obj);
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if (str == NULL)
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return NULL;
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return unicode_to_target_string (str.get ());
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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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In Python 3, the returned object is a "bytes" object (not a string). */
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gdbpy_ref<>
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python_string_to_target_python_string (PyObject *obj)
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{
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gdbpy_ref<> str = python_string_to_unicode (obj);
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if (str == NULL)
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return str;
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return unicode_to_target_python_string (str.get ());
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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
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set. */
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gdb::unique_xmalloc_ptr<char>
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python_string_to_host_string (PyObject *obj)
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{
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gdbpy_ref<> str = python_string_to_unicode (obj);
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if (str == NULL)
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return NULL;
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return unicode_to_encoded_string (str.get (), host_charset ());
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}
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/* Convert a host string to a python string. */
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gdbpy_ref<>
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host_string_to_python_string (const char *str)
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{
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return gdbpy_ref<> (PyString_Decode (str, strlen (str), host_charset (),
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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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#ifdef IS_PY3K
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return PyUnicode_Check (obj);
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#else
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return PyString_Check (obj) || PyUnicode_Check (obj);
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#endif
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}
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/* Return the string representation of OBJ, i.e., str (obj).
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If the result is NULL a python error occurred, the caller must clear it. */
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gdb::unique_xmalloc_ptr<char>
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gdbpy_obj_to_string (PyObject *obj)
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{
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gdbpy_ref<> str_obj (PyObject_Str (obj));
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if (str_obj != NULL)
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{
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gdb::unique_xmalloc_ptr<char> msg;
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#ifdef IS_PY3K
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msg = python_string_to_host_string (str_obj.get ());
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#else
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msg.reset (xstrdup (PyString_AsString (str_obj.get ())));
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#endif
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return msg;
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}
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return NULL;
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}
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/* See python-internal.h. */
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gdb::unique_xmalloc_ptr<char>
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gdbpy_err_fetch::to_string () const
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{
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/* There are a few cases to consider.
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For example:
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value is a string when PyErr_SetString is used.
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value is not a string when raise "foo" is used, instead it is None
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and type is "foo".
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So the algorithm we use is to print `str (value)' if it's not
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None, otherwise we print `str (type)'.
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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 (m_error_value && m_error_value != Py_None)
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return gdbpy_obj_to_string (m_error_value);
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else
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return gdbpy_obj_to_string (m_error_type);
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}
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/* See python-internal.h. */
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gdb::unique_xmalloc_ptr<char>
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gdbpy_err_fetch::type_to_string () const
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{
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return gdbpy_obj_to_string (m_error_type);
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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. */
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void
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gdbpy_convert_exception (const 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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PyErr_Format (exc_class, "%s", exception.what ());
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}
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/* Converts OBJ to a CORE_ADDR value.
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Returns 0 on success or -1 on failure, with a Python exception set.
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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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{
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try
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{
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*addr = value_as_address (value_object_to_value (obj));
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}
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catch (const gdb_exception &except)
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{
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GDB_PY_SET_HANDLE_EXCEPTION (except);
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}
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}
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else
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{
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gdbpy_ref<> num (PyNumber_Long (obj));
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gdb_py_ulongest val;
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if (num == NULL)
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return -1;
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val = gdb_py_long_as_ulongest (num.get ());
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if (PyErr_Occurred ())
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return -1;
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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 -1;
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}
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*addr = val;
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}
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return 0;
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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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gdbpy_ref<>
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gdb_py_object_from_longest (LONGEST l)
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{
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#ifdef IS_PY3K
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if (sizeof (l) > sizeof (long))
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return gdbpy_ref<> (PyLong_FromLongLong (l));
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return gdbpy_ref<> (PyLong_FromLong (l));
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#else
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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 gdbpy_ref<> (PyLong_FromLongLong (l));
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#endif
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return gdbpy_ref<> (PyInt_FromLong (l));
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#endif
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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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gdbpy_ref<>
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gdb_py_object_from_ulongest (ULONGEST l)
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{
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#ifdef IS_PY3K
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if (sizeof (l) > sizeof (unsigned long))
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return gdbpy_ref<> (PyLong_FromUnsignedLongLong (l));
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return gdbpy_ref<> (PyLong_FromUnsignedLong (l));
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#else
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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 gdbpy_ref<> (PyLong_FromUnsignedLongLong (l));
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#endif
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if (l > PyInt_GetMax ())
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return gdbpy_ref<> (PyLong_FromUnsignedLong (l));
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return gdbpy_ref<> (PyInt_FromLong (l));
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#endif
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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 = (PyTypeObject *) 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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/* Like PyModule_AddObject, but does not steal a reference to
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OBJECT. */
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int
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gdb_pymodule_addobject (PyObject *module, const char *name, PyObject *object)
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{
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int result;
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Py_INCREF (object);
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result = PyModule_AddObject (module, name, object);
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if (result < 0)
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Py_DECREF (object);
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return result;
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}
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/* Handle a Python exception when the special gdb.GdbError treatment
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is desired. This should only be called when an exception is set.
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If the exception is a gdb.GdbError, throw a gdb exception with the
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exception text. For other exceptions, print the Python stack and
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then throw a gdb exception. */
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void
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gdbpy_handle_exception ()
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{
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gdbpy_err_fetch fetched_error;
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gdb::unique_xmalloc_ptr<char> msg = fetched_error.to_string ();
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if (msg == NULL)
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{
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/* An error occurred computing the string representation of the
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error message. This is rare, but we should inform the user. */
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printf_filtered (_("An error occurred in Python "
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"and then another occurred computing the "
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"error message.\n"));
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gdbpy_print_stack ();
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}
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/* Don't print the stack for gdb.GdbError exceptions.
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It is generally used to flag user errors.
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We also don't want to print "Error occurred in Python command"
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for user errors. However, a missing message for gdb.GdbError
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exceptions is arguably a bug, so we flag it as such. */
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if (fetched_error.type_matches (PyExc_KeyboardInterrupt))
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throw_quit ("Quit");
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else if (! fetched_error.type_matches (gdbpy_gdberror_exc)
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|| msg == NULL || *msg == '\0')
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{
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fetched_error.restore ();
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gdbpy_print_stack ();
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if (msg != NULL && *msg != '\0')
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error (_("Error occurred in Python: %s"), msg.get ());
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else
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error (_("Error occurred in Python."));
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}
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else
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error ("%s", msg.get ());
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}
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