28e7fd6234
Two modifications:
1. The addition of 2013 to the copyright year range for every file;
2. The use of a single year range, instead of potentially multiple
year ranges, as approved by the FSF.
249 lines
6.6 KiB
C
249 lines
6.6 KiB
C
/* Python interface to lazy strings.
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Copyright (C) 2010-2013 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 "python-internal.h"
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#include "charset.h"
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#include "value.h"
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#include "exceptions.h"
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#include "valprint.h"
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#include "language.h"
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#include "gdb_assert.h"
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typedef struct {
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PyObject_HEAD
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/* Holds the address of the lazy string. */
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CORE_ADDR address;
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/* Holds the encoding that will be applied to the string
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when the string is printed by GDB. If the encoding is set
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to None then GDB will select the most appropriate
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encoding when the sting is printed. */
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char *encoding;
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/* Holds the length of the string in characters. If the
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length is -1, then the string will be fetched and encoded up to
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the first null of appropriate width. */
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long length;
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/* This attribute holds the type that is represented by the lazy
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string's type. */
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struct type *type;
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} lazy_string_object;
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static PyTypeObject lazy_string_object_type;
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static PyObject *
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stpy_get_address (PyObject *self, void *closure)
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{
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lazy_string_object *self_string = (lazy_string_object *) self;
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return gdb_py_long_from_ulongest (self_string->address);
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}
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static PyObject *
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stpy_get_encoding (PyObject *self, void *closure)
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{
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lazy_string_object *self_string = (lazy_string_object *) self;
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PyObject *result;
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/* An encoding can be set to NULL by the user, so check before
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attempting a Python FromString call. If NULL return Py_None. */
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if (self_string->encoding)
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result = PyString_FromString (self_string->encoding);
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else
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{
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result = Py_None;
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Py_INCREF (result);
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}
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return result;
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}
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static PyObject *
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stpy_get_length (PyObject *self, void *closure)
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{
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lazy_string_object *self_string = (lazy_string_object *) self;
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return PyLong_FromLong (self_string->length);
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}
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static PyObject *
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stpy_get_type (PyObject *self, void *closure)
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{
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lazy_string_object *str_obj = (lazy_string_object *) self;
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return type_to_type_object (str_obj->type);
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}
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static PyObject *
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stpy_convert_to_value (PyObject *self, PyObject *args)
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{
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lazy_string_object *self_string = (lazy_string_object *) self;
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struct value *val = NULL;
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volatile struct gdb_exception except;
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if (self_string->address == 0)
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{
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PyErr_SetString (PyExc_MemoryError,
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_("Cannot create a value from NULL."));
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return NULL;
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}
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TRY_CATCH (except, RETURN_MASK_ALL)
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{
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val = value_at_lazy (self_string->type, self_string->address);
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}
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GDB_PY_HANDLE_EXCEPTION (except);
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return value_to_value_object (val);
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}
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static void
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stpy_dealloc (PyObject *self)
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{
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lazy_string_object *self_string = (lazy_string_object *) self;
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xfree (self_string->encoding);
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}
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PyObject *
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gdbpy_create_lazy_string_object (CORE_ADDR address, long length,
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const char *encoding, struct type *type)
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{
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lazy_string_object *str_obj = NULL;
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if (address == 0 && length != 0)
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{
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PyErr_SetString (PyExc_MemoryError,
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_("Cannot create a lazy string with address 0x0, " \
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"and a non-zero length."));
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return NULL;
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}
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if (!type)
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{
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PyErr_SetString (PyExc_RuntimeError,
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_("A lazy string's type cannot be NULL."));
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return NULL;
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}
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str_obj = PyObject_New (lazy_string_object, &lazy_string_object_type);
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if (!str_obj)
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return NULL;
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str_obj->address = address;
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str_obj->length = length;
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if (encoding == NULL || !strcmp (encoding, ""))
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str_obj->encoding = NULL;
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else
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str_obj->encoding = xstrdup (encoding);
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str_obj->type = type;
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return (PyObject *) str_obj;
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}
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void
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gdbpy_initialize_lazy_string (void)
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{
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if (PyType_Ready (&lazy_string_object_type) < 0)
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return;
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Py_INCREF (&lazy_string_object_type);
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}
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/* Determine whether the printer object pointed to by OBJ is a
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Python lazy string. */
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int
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gdbpy_is_lazy_string (PyObject *result)
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{
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return PyObject_TypeCheck (result, &lazy_string_object_type);
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}
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/* Extract the parameters from the lazy string object STRING.
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ENCODING will either be set to NULL, or will be allocated with
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xmalloc, in which case the callers is responsible for freeing
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it. */
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void
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gdbpy_extract_lazy_string (PyObject *string, CORE_ADDR *addr,
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struct type **str_type,
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long *length, char **encoding)
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{
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lazy_string_object *lazy;
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gdb_assert (gdbpy_is_lazy_string (string));
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lazy = (lazy_string_object *) string;
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*addr = lazy->address;
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*str_type = lazy->type;
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*length = lazy->length;
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*encoding = lazy->encoding ? xstrdup (lazy->encoding) : NULL;
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}
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static PyMethodDef lazy_string_object_methods[] = {
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{ "value", stpy_convert_to_value, METH_NOARGS,
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"Create a (lazy) value that contains a pointer to the string." },
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{NULL} /* Sentinel */
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};
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static PyGetSetDef lazy_string_object_getset[] = {
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{ "address", stpy_get_address, NULL, "Address of the string.", NULL },
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{ "encoding", stpy_get_encoding, NULL, "Encoding of the string.", NULL },
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{ "length", stpy_get_length, NULL, "Length of the string.", NULL },
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{ "type", stpy_get_type, NULL, "Type associated with the string.", NULL },
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{ NULL } /* Sentinel */
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};
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static PyTypeObject lazy_string_object_type = {
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PyVarObject_HEAD_INIT (NULL, 0)
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"gdb.LazyString", /*tp_name*/
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sizeof (lazy_string_object), /*tp_basicsize*/
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0, /*tp_itemsize*/
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stpy_dealloc, /*tp_dealloc*/
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0, /*tp_print*/
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0, /*tp_getattr*/
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0, /*tp_setattr*/
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0, /*tp_compare*/
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0, /*tp_repr*/
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0, /*tp_as_number*/
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0, /*tp_as_sequence*/
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0, /*tp_as_mapping*/
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0, /*tp_hash */
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0, /*tp_call*/
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0, /*tp_str*/
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0, /*tp_getattro*/
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0, /*tp_setattro*/
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0, /*tp_as_buffer*/
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Py_TPFLAGS_DEFAULT, /*tp_flags*/
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"GDB lazy string object", /* tp_doc */
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0, /* tp_traverse */
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0, /* tp_clear */
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0, /* tp_richcompare */
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0, /* tp_weaklistoffset */
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0, /* tp_iter */
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0, /* tp_iternext */
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lazy_string_object_methods, /* tp_methods */
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0, /* tp_members */
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lazy_string_object_getset /* tp_getset */
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};
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