695 lines
20 KiB
C
695 lines
20 KiB
C
/* gdb commands implemented in Python
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Copyright (C) 2008-2022 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 "arch-utils.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 "language.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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const char *name;
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/* Completion function. */
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completer_ftype *completer;
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};
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static const 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", symbol_completer },
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{ "COMPLETE_EXPRESSION", expression_completer },
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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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extern PyTypeObject cmdpy_object_type
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CPYCHECKER_TYPE_OBJECT_FOR_TYPEDEF ("cmdpy_object");
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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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gdbpy_enter enter_py;
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/* Release our hold on the command object. */
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gdbpy_ref<cmdpy_object> cmd ((cmdpy_object *) context);
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cmd->command = NULL;
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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 (const char *args, int from_tty, cmd_list_element *command)
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{
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cmdpy_object *obj = (cmdpy_object *) command->context ();
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gdbpy_enter enter_py;
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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->is_prefix ())
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{
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/* A prefix command does not need an invoke method. */
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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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gdbpy_ref<> argobj (PyUnicode_Decode (args, strlen (args), host_charset (),
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NULL));
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if (argobj == NULL)
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{
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gdbpy_print_stack ();
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error (_("Could not convert arguments to Python string."));
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}
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gdbpy_ref<> ttyobj (PyBool_FromLong (from_tty));
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gdbpy_ref<> result (PyObject_CallMethodObjArgs ((PyObject *) obj, invoke_cst,
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argobj.get (), ttyobj.get (),
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NULL));
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if (result == NULL)
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gdbpy_handle_exception ();
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}
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/* Helper function for the Python command completers (both "pure"
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completer and brkchar handler). This function takes COMMAND, TEXT
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and WORD and tries to call the Python method for completion with
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these arguments.
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This function is usually called twice: once when we are figuring out
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the break characters to be used, and another to perform the real
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completion itself. The reason for this two step dance is that we
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need to know the set of "brkchars" to use early on, before we
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actually try to perform the completion. But if a Python command
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supplies a "complete" method then we have to call that method
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first: it may return as its result the kind of completion to
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perform and that will in turn specify which brkchars to use. IOW,
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we need the result of the "complete" method before we actually
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perform the completion. The only situation when this function is
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not called twice is when the user uses the "complete" command: in
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this scenario, there is no call to determine the "brkchars".
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Ideally, it would be nice to cache the result of the first call (to
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determine the "brkchars") and return this value directly in the
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second call (to perform the actual completion). However, due to
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the peculiarity of the "complete" command mentioned above, it is
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possible to put GDB in a bad state if you perform a TAB-completion
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and then a "complete"-completion sequentially. Therefore, we just
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recalculate everything twice for TAB-completions.
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This function returns a reference to the PyObject representing the
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Python method call. */
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static gdbpy_ref<>
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cmdpy_completer_helper (struct cmd_list_element *command,
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const char *text, const char *word)
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{
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cmdpy_object *obj = (cmdpy_object *) command->context ();
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if (obj == NULL)
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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. */
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return NULL;
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}
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gdbpy_ref<> textobj (PyUnicode_Decode (text, strlen (text), host_charset (),
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NULL));
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if (textobj == NULL)
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error (_("Could not convert argument to Python string."));
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gdbpy_ref<> wordobj;
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if (word == NULL)
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{
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/* "brkchars" phase. */
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wordobj = gdbpy_ref<>::new_reference (Py_None);
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}
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else
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{
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wordobj.reset (PyUnicode_Decode (word, strlen (word), host_charset (),
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NULL));
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if (wordobj == NULL)
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error (_("Could not convert argument to Python string."));
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}
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gdbpy_ref<> resultobj (PyObject_CallMethodObjArgs ((PyObject *) obj,
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complete_cst,
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textobj.get (),
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wordobj.get (), NULL));
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if (resultobj == NULL)
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{
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/* Just swallow errors here. */
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PyErr_Clear ();
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}
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return resultobj;
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}
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/* Python function called to determine the break characters of a
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certain completer. We are only interested in knowing if the
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completer registered by the user will return one of the integer
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codes (see COMPLETER_* symbols). */
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static void
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cmdpy_completer_handle_brkchars (struct cmd_list_element *command,
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completion_tracker &tracker,
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const char *text, const char *word)
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{
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gdbpy_enter enter_py;
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/* Calling our helper to obtain a reference to the PyObject of the Python
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function. */
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gdbpy_ref<> resultobj = cmdpy_completer_helper (command, text, word);
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/* Check if there was an error. */
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if (resultobj == NULL)
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return;
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if (PyLong_Check (resultobj.get ()))
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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. We are only
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interested in this kind of return. */
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long value;
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if (!gdb_py_int_as_long (resultobj.get (), &value))
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{
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/* Ignore. */
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PyErr_Clear ();
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}
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else if (value >= 0 && value < (long) N_COMPLETERS)
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{
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completer_handle_brkchars_ftype *brkchars_fn;
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/* This is the core of this function. Depending on which
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completer type the Python function returns, we have to
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adjust the break characters accordingly. */
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brkchars_fn = (completer_handle_brkchars_func_for_completer
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(completers[value].completer));
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brkchars_fn (command, tracker, text, word);
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}
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}
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}
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/* Called by gdb for command completion. */
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static void
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cmdpy_completer (struct cmd_list_element *command,
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completion_tracker &tracker,
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const char *text, const char *word)
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{
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gdbpy_enter enter_py;
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/* Calling our helper to obtain a reference to the PyObject of the Python
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function. */
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gdbpy_ref<> resultobj = cmdpy_completer_helper (command, text, word);
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/* If the result object of calling the Python function is NULL, it
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means that there was an error. In this case, just give up. */
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if (resultobj == NULL)
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return;
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if (PyLong_Check (resultobj.get ()))
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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;
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if (! gdb_py_int_as_long (resultobj.get (), &value))
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{
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/* Ignore. */
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PyErr_Clear ();
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}
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else if (value >= 0 && value < (long) N_COMPLETERS)
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completers[value].completer (command, tracker, text, word);
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}
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else
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{
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gdbpy_ref<> iter (PyObject_GetIter (resultobj.get ()));
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if (iter == NULL)
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return;
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bool got_matches = false;
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while (true)
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{
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gdbpy_ref<> elt (PyIter_Next (iter.get ()));
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if (elt == NULL)
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break;
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if (! gdbpy_is_string (elt.get ()))
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{
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/* Skip problem elements. */
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continue;
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}
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gdb::unique_xmalloc_ptr<char>
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item (python_string_to_host_string (elt.get ()));
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if (item == NULL)
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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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tracker.add_completion (std::move (item));
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got_matches = true;
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}
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/* If we got some results, ignore problems. Otherwise, report
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the problem. */
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if (got_matches && PyErr_Occurred ())
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PyErr_Clear ();
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}
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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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NAME 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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START_LIST is the list in which the search starts.
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This function returns the name of the new command. On error sets the Python
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error and returns NULL. */
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gdb::unique_xmalloc_ptr<char>
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gdbpy_parse_command_name (const char *name,
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struct cmd_list_element ***base_list,
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struct cmd_list_element **start_list)
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{
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struct cmd_list_element *elt;
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int len = strlen (name);
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int i, lastchar;
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const char *prefix_text2;
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/* Skip trailing whitespace. */
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for (i = len - 1; i >= 0 && (name[i] == ' ' || name[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 && valid_cmd_char_p (name[i - 1]); --i)
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;
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gdb::unique_xmalloc_ptr<char> result ((char *) xmalloc (lastchar - i + 2));
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memcpy (result.get (), &name[i], lastchar - i + 1);
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result.get ()[lastchar - i + 1] = '\0';
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/* Skip whitespace again. */
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for (--i; i >= 0 && (name[i] == ' ' || name[i] == '\t'); --i)
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;
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if (i < 0)
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{
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*base_list = start_list;
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return result;
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}
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std::string prefix_text (name, i + 1);
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prefix_text2 = prefix_text.c_str ();
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elt = lookup_cmd_1 (&prefix_text2, *start_list, NULL, NULL, 1);
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if (elt == NULL || elt == CMD_LIST_AMBIGUOUS)
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{
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PyErr_Format (PyExc_RuntimeError, _("Could not find command prefix %s."),
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prefix_text.c_str ());
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return NULL;
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}
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if (elt->is_prefix ())
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{
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*base_list = elt->subcommands;
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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.c_str ());
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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, COMMAND_CLASS [, COMPLETER_CLASS][, 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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COMMAND_CLASS 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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COMPLETER_CLASS 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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static int
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cmdpy_init (PyObject *self, PyObject *args, PyObject *kw)
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{
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cmdpy_object *obj = (cmdpy_object *) self;
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const char *name;
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int cmdtype;
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int completetype = -1;
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struct cmd_list_element **cmd_list;
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static const char *keywords[] = { "name", "command_class", "completer_class",
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"prefix", NULL };
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PyObject *is_prefix_obj = NULL;
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bool is_prefix = false;
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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 (!gdb_PyArg_ParseTupleAndKeywords (args, kw, "si|iO",
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keywords, &name, &cmdtype,
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&completetype, &is_prefix_obj))
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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 && cmdtype != class_user
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&& cmdtype != class_tui)
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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,
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_("Invalid completion type argument."));
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return -1;
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}
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gdb::unique_xmalloc_ptr<char> cmd_name
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= gdbpy_parse_command_name (name, &cmd_list, &cmdlist);
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if (cmd_name == nullptr)
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return -1;
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if (is_prefix_obj != NULL)
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{
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int cmp = PyObject_IsTrue (is_prefix_obj);
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if (cmp < 0)
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return -1;
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is_prefix = cmp > 0;
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}
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gdb::unique_xmalloc_ptr<char> docstring = nullptr;
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if (PyObject_HasAttr (self, gdbpy_doc_cst))
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{
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gdbpy_ref<> ds_obj (PyObject_GetAttr (self, gdbpy_doc_cst));
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if (ds_obj != NULL && gdbpy_is_string (ds_obj.get ()))
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{
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docstring = python_string_to_host_string (ds_obj.get ());
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if (docstring == nullptr)
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return -1;
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docstring = gdbpy_fix_doc_string_indentation (std::move (docstring));
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}
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}
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if (docstring == nullptr)
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docstring = make_unique_xstrdup (_("This command is not documented."));
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gdbpy_ref<> self_ref = gdbpy_ref<>::new_reference (self);
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try
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{
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struct cmd_list_element *cmd;
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if (is_prefix)
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{
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int allow_unknown;
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/* If we have our own "invoke" method, then allow unknown
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sub-commands. */
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allow_unknown = PyObject_HasAttr (self, invoke_cst);
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cmd = add_prefix_cmd (cmd_name.get (),
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(enum command_class) cmdtype,
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NULL, docstring.release (), &obj->sub_list,
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allow_unknown, cmd_list);
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}
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else
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cmd = add_cmd (cmd_name.get (), (enum command_class) cmdtype,
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docstring.release (), cmd_list);
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/* If successful, the above takes ownership of the name, since we set
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name_allocated, so release it. */
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cmd_name.release ();
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/* There appears to be no API to set this. */
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cmd->func = cmdpy_function;
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cmd->destroyer = cmdpy_destroyer;
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cmd->doc_allocated = 1;
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cmd->name_allocated = 1;
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obj->command = cmd;
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||
cmd->set_context (self_ref.release ());
|
||
set_cmd_completer (cmd, ((completetype == -1) ? cmdpy_completer
|
||
: completers[completetype].completer));
|
||
if (completetype == -1)
|
||
set_cmd_completer_handle_brkchars (cmd,
|
||
cmdpy_completer_handle_brkchars);
|
||
}
|
||
catch (const gdb_exception &except)
|
||
{
|
||
gdbpy_convert_exception (except);
|
||
return -1;
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
|
||
|
||
/* Initialize the 'commands' code. */
|
||
|
||
int
|
||
gdbpy_initialize_commands (void)
|
||
{
|
||
int i;
|
||
|
||
cmdpy_object_type.tp_new = PyType_GenericNew;
|
||
if (PyType_Ready (&cmdpy_object_type) < 0)
|
||
return -1;
|
||
|
||
/* Note: alias and user are special. */
|
||
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
|
||
|| PyModule_AddIntConstant (gdb_module, "COMMAND_USER", class_user) < 0
|
||
|| PyModule_AddIntConstant (gdb_module, "COMMAND_TUI", class_tui) < 0)
|
||
return -1;
|
||
|
||
for (i = 0; i < N_COMPLETERS; ++i)
|
||
{
|
||
if (PyModule_AddIntConstant (gdb_module, completers[i].name, i) < 0)
|
||
return -1;
|
||
}
|
||
|
||
if (gdb_pymodule_addobject (gdb_module, "Command",
|
||
(PyObject *) &cmdpy_object_type) < 0)
|
||
return -1;
|
||
|
||
invoke_cst = PyUnicode_FromString ("invoke");
|
||
if (invoke_cst == NULL)
|
||
return -1;
|
||
complete_cst = PyUnicode_FromString ("complete");
|
||
if (complete_cst == NULL)
|
||
return -1;
|
||
|
||
return 0;
|
||
}
|
||
|
||
|
||
|
||
static PyMethodDef cmdpy_object_methods[] =
|
||
{
|
||
{ "dont_repeat", cmdpy_dont_repeat, METH_NOARGS,
|
||
"Prevent command repetition when user enters empty line." },
|
||
|
||
{ 0 }
|
||
};
|
||
|
||
PyTypeObject cmdpy_object_type =
|
||
{
|
||
PyVarObject_HEAD_INIT (NULL, 0)
|
||
"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 */
|
||
};
|
||
|
||
|
||
|
||
/* Utility to build a buildargv-like result from ARGS.
|
||
This intentionally parses arguments the way libiberty/argv.c:buildargv
|
||
does. It splits up arguments in a reasonable way, and we want a standard
|
||
way of parsing arguments. Several gdb commands use buildargv to parse their
|
||
arguments. Plus we want to be able to write compatible python
|
||
implementations of gdb commands. */
|
||
|
||
PyObject *
|
||
gdbpy_string_to_argv (PyObject *self, PyObject *args)
|
||
{
|
||
const char *input;
|
||
|
||
if (!PyArg_ParseTuple (args, "s", &input))
|
||
return NULL;
|
||
|
||
gdbpy_ref<> py_argv (PyList_New (0));
|
||
if (py_argv == NULL)
|
||
return NULL;
|
||
|
||
/* buildargv uses NULL to represent an empty argument list, but we can't use
|
||
that in Python. Instead, if ARGS is "" then return an empty list.
|
||
This undoes the NULL -> "" conversion that cmdpy_function does. */
|
||
|
||
if (*input != '\0')
|
||
{
|
||
gdb_argv c_argv (input);
|
||
|
||
for (char *arg : c_argv)
|
||
{
|
||
gdbpy_ref<> argp (PyUnicode_FromString (arg));
|
||
|
||
if (argp == NULL
|
||
|| PyList_Append (py_argv.get (), argp.get ()) < 0)
|
||
return NULL;
|
||
}
|
||
}
|
||
|
||
return py_argv.release ();
|
||
}
|