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255 lines
6.5 KiB
C
255 lines
6.5 KiB
C
/* Convenience functions implemented in Python.
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Copyright (C) 2008-2015 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 "value.h"
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#include "python-internal.h"
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#include "charset.h"
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#include "gdbcmd.h"
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#include "cli/cli-decode.h"
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#include "completer.h"
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#include "expression.h"
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#include "language.h"
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static PyTypeObject fnpy_object_type
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CPYCHECKER_TYPE_OBJECT_FOR_TYPEDEF ("PyObject");
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static PyObject *
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convert_values_to_python (int argc, struct value **argv)
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{
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int i;
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PyObject *result = PyTuple_New (argc);
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if (! result)
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return NULL;
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for (i = 0; i < argc; ++i)
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{
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PyObject *elt = value_to_value_object (argv[i]);
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if (! elt)
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{
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Py_DECREF (result);
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return NULL;
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}
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PyTuple_SetItem (result, i, elt);
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}
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return result;
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}
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/* Call a Python function object's invoke method. */
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static struct value *
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fnpy_call (struct gdbarch *gdbarch, const struct language_defn *language,
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void *cookie, int argc, struct value **argv)
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{
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struct value *value = NULL;
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/* 'result' must be set to NULL, this initially indicates whether
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the function was called, or not. */
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PyObject *result = NULL;
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PyObject *callable, *args;
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struct cleanup *cleanup;
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cleanup = ensure_python_env (gdbarch, language);
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args = convert_values_to_python (argc, argv);
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/* convert_values_to_python can return NULL on error. If we
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encounter this, do not call the function, but allow the Python ->
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error code conversion below to deal with the Python exception.
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Note, that this is different if the function simply does not
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have arguments. */
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if (args)
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{
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callable = PyObject_GetAttrString ((PyObject *) cookie, "invoke");
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if (! callable)
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{
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Py_DECREF (args);
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error (_("No method named 'invoke' in object."));
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}
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result = PyObject_Call (callable, args, NULL);
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Py_DECREF (callable);
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Py_DECREF (args);
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}
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if (!result)
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{
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PyObject *ptype, *pvalue, *ptraceback;
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char *msg;
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PyErr_Fetch (&ptype, &pvalue, &ptraceback);
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/* Try to fetch an error message contained within ptype, pvalue.
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When fetching the error message we need to make our own copy,
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we no longer own ptype, pvalue after the call to PyErr_Restore. */
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msg = gdbpy_exception_to_string (ptype, pvalue);
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make_cleanup (xfree, msg);
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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 a Python "
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"convenience function\n"
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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 (!PyErr_GivenExceptionMatches (ptype, gdbpy_gdberror_exc)
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|| msg == NULL || *msg == '\0')
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{
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PyErr_Restore (ptype, pvalue, ptraceback);
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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 convenience function: %s"),
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msg);
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else
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error (_("Error occurred in Python convenience function."));
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}
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else
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{
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Py_XDECREF (ptype);
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Py_XDECREF (pvalue);
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Py_XDECREF (ptraceback);
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error ("%s", msg);
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}
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}
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value = convert_value_from_python (result);
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if (value == NULL)
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{
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Py_DECREF (result);
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gdbpy_print_stack ();
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error (_("Error while executing Python code."));
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}
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Py_DECREF (result);
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do_cleanups (cleanup);
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return value;
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}
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/* Initializer for a Function object. It takes one argument, the name
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of the function. */
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static int
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fnpy_init (PyObject *self, PyObject *args, PyObject *kwds)
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{
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const char *name;
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char *docstring = NULL;
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if (! PyArg_ParseTuple (args, "s", &name))
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return -1;
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Py_INCREF (self);
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if (PyObject_HasAttrString (self, "__doc__"))
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{
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PyObject *ds_obj = PyObject_GetAttrString (self, "__doc__");
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if (ds_obj != NULL)
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{
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if (gdbpy_is_string (ds_obj))
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{
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docstring = python_string_to_host_string (ds_obj);
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if (docstring == NULL)
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{
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Py_DECREF (self);
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Py_DECREF (ds_obj);
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return -1;
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}
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}
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Py_DECREF (ds_obj);
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}
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}
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if (! docstring)
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docstring = xstrdup (_("This function is not documented."));
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add_internal_function (name, docstring, fnpy_call, self);
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return 0;
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}
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/* Initialize internal function support. */
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int
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gdbpy_initialize_functions (void)
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{
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fnpy_object_type.tp_new = PyType_GenericNew;
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if (PyType_Ready (&fnpy_object_type) < 0)
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return -1;
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return gdb_pymodule_addobject (gdb_module, "Function",
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(PyObject *) &fnpy_object_type);
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}
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static PyTypeObject fnpy_object_type =
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{
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PyVarObject_HEAD_INIT (NULL, 0)
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"gdb.Function", /*tp_name*/
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sizeof (PyObject), /*tp_basicsize*/
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0, /*tp_itemsize*/
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0, /*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 | Py_TPFLAGS_BASETYPE, /*tp_flags*/
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"GDB function 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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0, /* tp_methods */
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0, /* tp_members */
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0, /* tp_getset */
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0, /* tp_base */
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0, /* tp_dict */
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0, /* tp_descr_get */
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0, /* tp_descr_set */
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0, /* tp_dictoffset */
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fnpy_init, /* tp_init */
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0, /* tp_alloc */
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};
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