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/* Convenience functions implemented in Python.
Copyright (C) 2008-2021 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 "value.h"
#include "python-internal.h"
#include "charset.h"
#include "gdbcmd.h"
#include "cli/cli-decode.h"
#include "completer.h"
#include "expression.h"
#include "language.h"
extern PyTypeObject fnpy_object_type
CPYCHECKER_TYPE_OBJECT_FOR_TYPEDEF ("PyObject");
/* Return a reference to a tuple ARGC elements long. Each element of the
tuple is a PyObject converted from the corresponding element of ARGV. */
static gdbpy_ref<>
convert_values_to_python (int argc, struct value **argv)
{
int i;
gdbpy_ref<> result (PyTuple_New (argc));
if (result == NULL)
return NULL;
for (i = 0; i < argc; ++i)
{
gdbpy_ref<> elt (value_to_value_object (argv[i]));
if (elt == NULL)
return NULL;
PyTuple_SetItem (result.get (), i, elt.release ());
}
return result;
}
/* Call a Python function object's invoke method. */
static struct value *
fnpy_call (struct gdbarch *gdbarch, const struct language_defn *language,
void *cookie, int argc, struct value **argv)
{
/* The gdbpy_enter object needs to be placed first, so that it's the last to
be destroyed. */
gdbpy_enter enter_py (gdbarch, language);
struct value *value;
gdbpy_ref<> result;
gdbpy_ref<> args = convert_values_to_python (argc, argv);
/* convert_values_to_python can return NULL on error. If we
encounter this, do not call the function, but allow the Python ->
error code conversion below to deal with the Python exception.
Note, that this is different if the function simply does not
have arguments. */
if (args != NULL)
{
gdbpy_ref<> callable (PyObject_GetAttrString ((PyObject *) cookie,
"invoke"));
if (callable == NULL)
error (_("No method named 'invoke' in object."));
result.reset (PyObject_Call (callable.get (), args.get (), NULL));
}
if (result == NULL)
gdbpy_handle_exception ();
value = convert_value_from_python (result.get ());
if (value == NULL)
{
gdbpy_print_stack ();
error (_("Error while executing Python code."));
}
return value;
}
/* Initializer for a Function object. It takes one argument, the name
of the function. */
static int
fnpy_init (PyObject *self, PyObject *args, PyObject *kwds)
{
const char *name;
gdb::unique_xmalloc_ptr<char> docstring;
if (! PyArg_ParseTuple (args, "s", &name))
return -1;
gdbpy_ref<> self_ref = gdbpy_ref<>::new_reference (self);
if (PyObject_HasAttrString (self, "__doc__"))
{
gdbpy_ref<> ds_obj (PyObject_GetAttrString (self, "__doc__"));
if (ds_obj != NULL)
{
if (gdbpy_is_string (ds_obj.get ()))
{
docstring = python_string_to_host_string (ds_obj.get ());
if (docstring == NULL)
return -1;
}
}
}
if (! docstring)
docstring.reset (xstrdup (_("This function is not documented.")));
add_internal_function (make_unique_xstrdup (name), std::move (docstring),
fnpy_call, self_ref.release ());
return 0;
}
/* Initialize internal function support. */
int
gdbpy_initialize_functions (void)
{
fnpy_object_type.tp_new = PyType_GenericNew;
if (PyType_Ready (&fnpy_object_type) < 0)
return -1;
return gdb_pymodule_addobject (gdb_module, "Function",
(PyObject *) &fnpy_object_type);
}
PyTypeObject fnpy_object_type =
{
PyVarObject_HEAD_INIT (NULL, 0)
"gdb.Function", /*tp_name*/
sizeof (PyObject), /*tp_basicsize*/
0, /*tp_itemsize*/
0, /*tp_dealloc*/
0, /*tp_print*/
0, /*tp_getattr*/
0, /*tp_setattr*/
0, /*tp_compare*/
0, /*tp_repr*/
0, /*tp_as_number*/
0, /*tp_as_sequence*/
0, /*tp_as_mapping*/
0, /*tp_hash */
0, /*tp_call*/
0, /*tp_str*/
0, /*tp_getattro*/
0, /*tp_setattro*/
0, /*tp_as_buffer*/
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /*tp_flags*/
"GDB function object", /* tp_doc */
0, /* tp_traverse */
0, /* tp_clear */
0, /* tp_richcompare */
0, /* tp_weaklistoffset */
0, /* tp_iter */
0, /* tp_iternext */
0, /* tp_methods */
0, /* tp_members */
0, /* tp_getset */
0, /* tp_base */
0, /* tp_dict */
0, /* tp_descr_get */
0, /* tp_descr_set */
0, /* tp_dictoffset */
fnpy_init, /* tp_init */
0, /* tp_alloc */
};
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