586 lines
16 KiB
C
586 lines
16 KiB
C
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/* gdb commands implemented in Python
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Copyright (C) 2008, 2009 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 "exceptions.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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/* Struct representing built-in completion types. */
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struct cmdpy_completer
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{
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/* Python symbol name. */
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char *name;
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/* Completion function. */
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char **(*completer) (struct cmd_list_element *, char *, char *);
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};
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static struct cmdpy_completer completers[] =
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{
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{ "COMPLETE_NONE", noop_completer },
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{ "COMPLETE_FILENAME", filename_completer },
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{ "COMPLETE_LOCATION", location_completer },
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{ "COMPLETE_COMMAND", command_completer },
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{ "COMPLETE_SYMBOL", make_symbol_completion_list_fn },
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};
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#define N_COMPLETERS (sizeof (completers) / sizeof (completers[0]))
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/* A gdb command. For the time being only ordinary commands (not
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set/show commands) are allowed. */
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struct cmdpy_object
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{
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PyObject_HEAD
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/* The corresponding gdb command object, or NULL if the command is
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no longer installed. */
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struct cmd_list_element *command;
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/* A prefix command requires storage for a list of its sub-commands.
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A pointer to this is passed to add_prefix_command, and to add_cmd
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for sub-commands of that prefix. If this Command is not a prefix
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command, then this field is unused. */
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struct cmd_list_element *sub_list;
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};
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typedef struct cmdpy_object cmdpy_object;
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static PyTypeObject cmdpy_object_type;
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/* Constants used by this module. */
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static PyObject *invoke_cst;
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static PyObject *complete_cst;
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/* Python function which wraps dont_repeat. */
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static PyObject *
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cmdpy_dont_repeat (PyObject *self, PyObject *args)
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{
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dont_repeat ();
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Py_RETURN_NONE;
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}
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/* Called if the gdb cmd_list_element is destroyed. */
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static void
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cmdpy_destroyer (struct cmd_list_element *self, void *context)
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{
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cmdpy_object *cmd;
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PyGILState_STATE state;
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state = PyGILState_Ensure ();
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/* Release our hold on the command object. */
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cmd = (cmdpy_object *) context;
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cmd->command = NULL;
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Py_DECREF (cmd);
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/* We allocated the name, doc string, and perhaps the prefix
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name. */
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xfree (self->name);
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xfree (self->doc);
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xfree (self->prefixname);
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PyGILState_Release (state);
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}
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/* Called by gdb to invoke the command. */
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static void
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cmdpy_function (struct cmd_list_element *command, char *args, int from_tty)
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{
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cmdpy_object *obj = (cmdpy_object *) get_cmd_context (command);
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PyObject *argobj, *ttyobj, *result;
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struct cleanup *cleanup;
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PyGILState_STATE state;
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state = PyGILState_Ensure ();
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cleanup = make_cleanup_py_restore_gil (&state);
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if (! obj)
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error (_("Invalid invocation of Python command object."));
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if (! PyObject_HasAttr ((PyObject *) obj, invoke_cst))
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{
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if (obj->command->prefixname)
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{
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/* A prefix command does not need an invoke method. */
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do_cleanups (cleanup);
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return;
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}
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error (_("Python command object missing 'invoke' method."));
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}
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if (! args)
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args = "";
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argobj = PyUnicode_Decode (args, strlen (args), host_charset (), NULL);
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if (! argobj)
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error (_("Could not convert arguments to Python string."));
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ttyobj = from_tty ? Py_True : Py_False;
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Py_INCREF (ttyobj);
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result = PyObject_CallMethodObjArgs ((PyObject *) obj, invoke_cst, argobj,
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ttyobj, NULL);
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Py_DECREF (argobj);
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Py_DECREF (ttyobj);
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if (! result)
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{
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PyObject *ptype, *pvalue, *ptraceback;
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char *s, *str;
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PyErr_Fetch (&ptype, &pvalue, &ptraceback);
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if (pvalue && PyString_Check (pvalue))
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{
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/* Make a temporary copy of the string data. */
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char *s = PyString_AsString (pvalue);
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char *copy = alloca (strlen (s) + 1);
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strcpy (copy, s);
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PyErr_Restore (ptype, pvalue, ptraceback);
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gdbpy_print_stack ();
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error (_("Error occurred in Python command: %s"), copy);
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}
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else
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{
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PyErr_Restore (ptype, pvalue, ptraceback);
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gdbpy_print_stack ();
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error (_("Error occurred in Python command."));
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}
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}
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Py_DECREF (result);
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do_cleanups (cleanup);
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}
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/* Called by gdb for command completion. */
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static char **
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cmdpy_completer (struct cmd_list_element *command, char *text, char *word)
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{
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cmdpy_object *obj = (cmdpy_object *) get_cmd_context (command);
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PyObject *textobj, *wordobj, *resultobj = NULL;
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char **result = NULL;
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struct cleanup *cleanup;
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PyGILState_STATE state;
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state = PyGILState_Ensure ();
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cleanup = make_cleanup_py_restore_gil (&state);
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if (! obj)
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error (_("Invalid invocation of Python command object."));
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if (! PyObject_HasAttr ((PyObject *) obj, complete_cst))
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{
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/* If there is no complete method, don't error -- instead, just
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say that there are no completions. */
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goto done;
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}
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textobj = PyUnicode_Decode (text, strlen (text), host_charset (), NULL);
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if (! textobj)
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error (_("Could not convert argument to Python string."));
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wordobj = PyUnicode_Decode (word, strlen (word), host_charset (), NULL);
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if (! wordobj)
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error (_("Could not convert argument to Python string."));
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resultobj = PyObject_CallMethodObjArgs ((PyObject *) obj, complete_cst,
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textobj, wordobj, NULL);
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Py_DECREF (textobj);
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Py_DECREF (wordobj);
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if (! resultobj)
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{
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/* Just swallow errors here. */
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PyErr_Clear ();
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goto done;
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}
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make_cleanup_py_decref (resultobj);
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result = NULL;
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if (PySequence_Check (resultobj))
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{
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Py_ssize_t i, len = PySequence_Size (resultobj);
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Py_ssize_t out;
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if (len < 0)
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goto done;
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result = (char **) xmalloc ((len + 1) * sizeof (char *));
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for (i = out = 0; i < len; ++i)
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{
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int l;
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PyObject *elt = PySequence_GetItem (resultobj, i);
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if (elt == NULL || ! gdbpy_is_string (elt))
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{
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/* Skip problem elements. */
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PyErr_Clear ();
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continue;
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}
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result[out] = python_string_to_host_string (elt);
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++out;
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}
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result[out] = NULL;
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}
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else if (PyInt_Check (resultobj))
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{
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/* User code may also return one of the completion constants,
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thus requesting that sort of completion. */
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long value = PyInt_AsLong (resultobj);
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if (value >= 0 && value < (long) N_COMPLETERS)
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result = completers[value].completer (command, text, word);
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}
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done:
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do_cleanups (cleanup);
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return result;
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}
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/* Helper for cmdpy_init which locates the command list to use and
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pulls out the command name.
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TEXT is the command name list. The final word in the list is the
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name of the new command. All earlier words must be existing prefix
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commands.
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*BASE_LIST is set to the final prefix command's list of
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*sub-commands.
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This function returns the xmalloc()d name of the new command. On
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error sets the Python error and returns NULL. */
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static char *
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parse_command_name (char *text, struct cmd_list_element ***base_list)
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{
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struct cmd_list_element *elt;
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int len = strlen (text);
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int i, lastchar;
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char *prefix_text;
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char *result;
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/* Skip trailing whitespace. */
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for (i = len - 1; i >= 0 && (text[i] == ' ' || text[i] == '\t'); --i)
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;
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if (i < 0)
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{
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PyErr_SetString (PyExc_RuntimeError, _("no command name found"));
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return NULL;
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}
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lastchar = i;
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/* Find first character of the final word. */
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for (; i > 0 && (isalnum (text[i - 1])
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|| text[i - 1] == '-'
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|| text[i - 1] == '_');
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--i)
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;
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result = xmalloc (lastchar - i + 2);
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memcpy (result, &text[i], lastchar - i + 1);
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result[lastchar - i + 1] = '\0';
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/* Skip whitespace again. */
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for (--i; i >= 0 && (text[i] == ' ' || text[i] == '\t'); --i)
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;
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if (i < 0)
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{
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*base_list = &cmdlist;
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return result;
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}
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prefix_text = xmalloc (i + 2);
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memcpy (prefix_text, text, i + 1);
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prefix_text[i + 1] = '\0';
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text = prefix_text;
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elt = lookup_cmd_1 (&text, cmdlist, NULL, 1);
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if (!elt || elt == (struct cmd_list_element *) -1)
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{
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PyErr_Format (PyExc_RuntimeError, _("could not find command prefix %s"),
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prefix_text);
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xfree (prefix_text);
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xfree (result);
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return NULL;
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}
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if (elt->prefixlist)
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{
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xfree (prefix_text);
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*base_list = elt->prefixlist;
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return result;
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}
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PyErr_Format (PyExc_RuntimeError, _("'%s' is not a prefix command"),
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prefix_text);
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xfree (prefix_text);
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xfree (result);
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return NULL;
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}
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/* Object initializer; sets up gdb-side structures for command.
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Use: __init__(NAME, CMDCLASS, [COMPLETERCLASS, [PREFIX]]).
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NAME is the name of the command. It may consist of multiple words,
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in which case the final word is the name of the new command, and
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earlier words must be prefix commands.
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CMDCLASS is the kind of command. It should be one of the COMMAND_*
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constants defined in the gdb module.
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COMPLETERCLASS is the kind of completer. If not given, the
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"complete" method will be used. Otherwise, it should be one of the
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COMPLETE_* constants defined in the gdb module.
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If PREFIX is True, then this command is a prefix command.
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The documentation for the command is taken from the doc string for
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the python class.
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*/
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static int
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cmdpy_init (PyObject *self, PyObject *args, PyObject *kwds)
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{
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cmdpy_object *obj = (cmdpy_object *) self;
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char *name;
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int cmdtype;
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int completetype = -1;
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char *docstring = NULL;
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volatile struct gdb_exception except;
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struct cmd_list_element **cmd_list;
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char *cmd_name, *pfx_name;
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PyObject *is_prefix = NULL;
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int cmp;
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if (obj->command)
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{
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/* Note: this is apparently not documented in Python. We return
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0 for success, -1 for failure. */
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PyErr_Format (PyExc_RuntimeError,
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_("command object already initialized"));
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return -1;
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}
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if (! PyArg_ParseTuple (args, "si|iO", &name, &cmdtype,
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&completetype, &is_prefix))
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return -1;
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if (cmdtype != no_class && cmdtype != class_run
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&& cmdtype != class_vars && cmdtype != class_stack
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&& cmdtype != class_files && cmdtype != class_support
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&& cmdtype != class_info && cmdtype != class_breakpoint
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&& cmdtype != class_trace && cmdtype != class_obscure
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&& cmdtype != class_maintenance)
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{
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PyErr_Format (PyExc_RuntimeError, _("invalid command class argument"));
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return -1;
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}
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if (completetype < -1 || completetype >= (int) N_COMPLETERS)
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{
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PyErr_Format (PyExc_RuntimeError, _("invalid completion type argument"));
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return -1;
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}
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cmd_name = parse_command_name (name, &cmd_list);
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if (! cmd_name)
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return -1;
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pfx_name = NULL;
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if (is_prefix != NULL)
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{
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cmp = PyObject_IsTrue (is_prefix);
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if (cmp == 1)
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{
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int i, out;
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/* Make a normalized form of the command name. */
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pfx_name = xmalloc (strlen (name) + 2);
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i = 0;
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out = 0;
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while (name[i])
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{
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/* Skip whitespace. */
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while (name[i] == ' ' || name[i] == '\t')
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++i;
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/* Copy non-whitespace characters. */
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while (name[i] && name[i] != ' ' && name[i] != '\t')
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pfx_name[out++] = name[i++];
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/* Add a single space after each word -- including the final
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word. */
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pfx_name[out++] = ' ';
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|
}
|
|||
|
pfx_name[out] = '\0';
|
|||
|
}
|
|||
|
else if (cmp < 0)
|
|||
|
return -1;
|
|||
|
}
|
|||
|
if (PyObject_HasAttr (self, gdbpy_doc_cst))
|
|||
|
{
|
|||
|
PyObject *ds_obj = PyObject_GetAttr (self, gdbpy_doc_cst);
|
|||
|
if (ds_obj && gdbpy_is_string (ds_obj))
|
|||
|
docstring = python_string_to_host_string (ds_obj);
|
|||
|
}
|
|||
|
if (! docstring)
|
|||
|
docstring = xstrdup (_("This command is not documented."));
|
|||
|
|
|||
|
Py_INCREF (self);
|
|||
|
|
|||
|
TRY_CATCH (except, RETURN_MASK_ALL)
|
|||
|
{
|
|||
|
struct cmd_list_element *cmd;
|
|||
|
|
|||
|
if (pfx_name)
|
|||
|
{
|
|||
|
int allow_unknown;
|
|||
|
|
|||
|
/* If we have our own "invoke" method, then allow unknown
|
|||
|
sub-commands. */
|
|||
|
allow_unknown = PyObject_HasAttr (self, invoke_cst);
|
|||
|
cmd = add_prefix_cmd (cmd_name, (enum command_class) cmdtype,
|
|||
|
NULL, docstring, &obj->sub_list,
|
|||
|
pfx_name, allow_unknown, cmd_list);
|
|||
|
}
|
|||
|
else
|
|||
|
cmd = add_cmd (cmd_name, (enum command_class) cmdtype, NULL,
|
|||
|
docstring, cmd_list);
|
|||
|
|
|||
|
/* There appears to be no API to set this. */
|
|||
|
cmd->func = cmdpy_function;
|
|||
|
cmd->destroyer = cmdpy_destroyer;
|
|||
|
|
|||
|
obj->command = cmd;
|
|||
|
set_cmd_context (cmd, self);
|
|||
|
set_cmd_completer (cmd, ((completetype == -1) ? cmdpy_completer
|
|||
|
: completers[completetype].completer));
|
|||
|
}
|
|||
|
if (except.reason < 0)
|
|||
|
{
|
|||
|
xfree (cmd_name);
|
|||
|
xfree (docstring);
|
|||
|
xfree (pfx_name);
|
|||
|
Py_DECREF (self);
|
|||
|
PyErr_Format (except.reason == RETURN_QUIT
|
|||
|
? PyExc_KeyboardInterrupt : PyExc_RuntimeError,
|
|||
|
"%s", except.message);
|
|||
|
return -1;
|
|||
|
}
|
|||
|
return 0;
|
|||
|
}
|
|||
|
|
|||
|
|
|||
|
|
|||
|
/* Initialize the 'commands' code. */
|
|||
|
void
|
|||
|
gdbpy_initialize_commands (void)
|
|||
|
{
|
|||
|
int i;
|
|||
|
|
|||
|
if (PyType_Ready (&cmdpy_object_type) < 0)
|
|||
|
return;
|
|||
|
|
|||
|
/* Note: alias and user are special; pseudo appears to be unused,
|
|||
|
and there is no reason to expose tui or xdb, I think. */
|
|||
|
if (PyModule_AddIntConstant (gdb_module, "COMMAND_NONE", no_class) < 0
|
|||
|
|| PyModule_AddIntConstant (gdb_module, "COMMAND_RUNNING", class_run) < 0
|
|||
|
|| PyModule_AddIntConstant (gdb_module, "COMMAND_DATA", class_vars) < 0
|
|||
|
|| PyModule_AddIntConstant (gdb_module, "COMMAND_STACK", class_stack) < 0
|
|||
|
|| PyModule_AddIntConstant (gdb_module, "COMMAND_FILES", class_files) < 0
|
|||
|
|| PyModule_AddIntConstant (gdb_module, "COMMAND_SUPPORT",
|
|||
|
class_support) < 0
|
|||
|
|| PyModule_AddIntConstant (gdb_module, "COMMAND_STATUS", class_info) < 0
|
|||
|
|| PyModule_AddIntConstant (gdb_module, "COMMAND_BREAKPOINTS",
|
|||
|
class_breakpoint) < 0
|
|||
|
|| PyModule_AddIntConstant (gdb_module, "COMMAND_TRACEPOINTS",
|
|||
|
class_trace) < 0
|
|||
|
|| PyModule_AddIntConstant (gdb_module, "COMMAND_OBSCURE",
|
|||
|
class_obscure) < 0
|
|||
|
|| PyModule_AddIntConstant (gdb_module, "COMMAND_MAINTENANCE",
|
|||
|
class_maintenance) < 0)
|
|||
|
return;
|
|||
|
|
|||
|
for (i = 0; i < N_COMPLETERS; ++i)
|
|||
|
{
|
|||
|
if (PyModule_AddIntConstant (gdb_module, completers[i].name, i) < 0)
|
|||
|
return;
|
|||
|
}
|
|||
|
|
|||
|
Py_INCREF (&cmdpy_object_type);
|
|||
|
PyModule_AddObject (gdb_module, "Command",
|
|||
|
(PyObject *) &cmdpy_object_type);
|
|||
|
|
|||
|
invoke_cst = PyString_FromString ("invoke");
|
|||
|
complete_cst = PyString_FromString ("complete");
|
|||
|
}
|
|||
|
|
|||
|
|
|||
|
|
|||
|
static PyMethodDef cmdpy_object_methods[] =
|
|||
|
{
|
|||
|
{ "dont_repeat", cmdpy_dont_repeat, METH_NOARGS,
|
|||
|
"Prevent command repetition when user enters empty line." },
|
|||
|
|
|||
|
{ 0 }
|
|||
|
};
|
|||
|
|
|||
|
static PyTypeObject cmdpy_object_type =
|
|||
|
{
|
|||
|
PyObject_HEAD_INIT (NULL)
|
|||
|
0, /*ob_size*/
|
|||
|
"gdb.Command", /*tp_name*/
|
|||
|
sizeof (cmdpy_object), /*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 command object", /* tp_doc */
|
|||
|
0, /* tp_traverse */
|
|||
|
0, /* tp_clear */
|
|||
|
0, /* tp_richcompare */
|
|||
|
0, /* tp_weaklistoffset */
|
|||
|
0, /* tp_iter */
|
|||
|
0, /* tp_iternext */
|
|||
|
cmdpy_object_methods, /* 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 */
|
|||
|
cmdpy_init, /* tp_init */
|
|||
|
0, /* tp_alloc */
|
|||
|
PyType_GenericNew /* tp_new */
|
|||
|
};
|