741 lines
19 KiB
C
741 lines
19 KiB
C
/* General python/gdb code
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Copyright (C) 2008, 2009, 2010 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 "command.h"
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#include "ui-out.h"
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#include "cli/cli-script.h"
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#include "gdbcmd.h"
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#include "objfiles.h"
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#include "observer.h"
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#include "value.h"
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#include "language.h"
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#include "exceptions.h"
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#include <ctype.h>
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/* True if we should print the stack when catching a Python error,
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false otherwise. */
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static int gdbpy_should_print_stack = 1;
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/* This is true if we should auto-load python code when an objfile is
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opened, false otherwise. */
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static int gdbpy_auto_load = 1;
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#ifdef HAVE_PYTHON
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#include "python.h"
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#include "libiberty.h"
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#include "cli/cli-decode.h"
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#include "charset.h"
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#include "top.h"
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#include "python-internal.h"
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#include "version.h"
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#include "target.h"
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#include "gdbthread.h"
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||
|
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static PyMethodDef GdbMethods[];
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||
|
||
PyObject *gdb_module;
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||
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||
/* Some string constants we may wish to use. */
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||
PyObject *gdbpy_to_string_cst;
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||
PyObject *gdbpy_children_cst;
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||
PyObject *gdbpy_display_hint_cst;
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||
PyObject *gdbpy_doc_cst;
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||
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||
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/* Architecture and language to be used in callbacks from
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the Python interpreter. */
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||
struct gdbarch *python_gdbarch;
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const struct language_defn *python_language;
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||
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/* Restore global language and architecture and Python GIL state
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||
when leaving the Python interpreter. */
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||
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||
struct python_env
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{
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||
PyGILState_STATE state;
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struct gdbarch *gdbarch;
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const struct language_defn *language;
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||
};
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static void
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||
restore_python_env (void *p)
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{
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struct python_env *env = (struct python_env *)p;
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PyGILState_Release (env->state);
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python_gdbarch = env->gdbarch;
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python_language = env->language;
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xfree (env);
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}
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/* Called before entering the Python interpreter to install the
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current language and architecture to be used for Python values. */
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struct cleanup *
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ensure_python_env (struct gdbarch *gdbarch,
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const struct language_defn *language)
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{
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struct python_env *env = xmalloc (sizeof *env);
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env->state = PyGILState_Ensure ();
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env->gdbarch = python_gdbarch;
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env->language = python_language;
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python_gdbarch = gdbarch;
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python_language = language;
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return make_cleanup (restore_python_env, env);
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}
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/* Given a command_line, return a command string suitable for passing
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to Python. Lines in the string are separated by newlines. The
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return value is allocated using xmalloc and the caller is
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responsible for freeing it. */
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static char *
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compute_python_string (struct command_line *l)
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{
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struct command_line *iter;
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char *script = NULL;
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int size = 0;
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int here;
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||
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for (iter = l; iter; iter = iter->next)
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size += strlen (iter->line) + 1;
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script = xmalloc (size + 1);
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here = 0;
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for (iter = l; iter; iter = iter->next)
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{
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int len = strlen (iter->line);
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strcpy (&script[here], iter->line);
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here += len;
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script[here++] = '\n';
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}
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script[here] = '\0';
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return script;
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}
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/* Take a command line structure representing a 'python' command, and
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evaluate its body using the Python interpreter. */
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void
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eval_python_from_control_command (struct command_line *cmd)
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||
{
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int ret;
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||
char *script;
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||
struct cleanup *cleanup;
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||
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if (cmd->body_count != 1)
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error (_("Invalid \"python\" block structure."));
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cleanup = ensure_python_env (get_current_arch (), current_language);
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script = compute_python_string (cmd->body_list[0]);
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ret = PyRun_SimpleString (script);
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xfree (script);
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if (ret)
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||
{
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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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||
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do_cleanups (cleanup);
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||
}
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||
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/* Implementation of the gdb "python" command. */
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||
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static void
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python_command (char *arg, int from_tty)
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{
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struct cleanup *cleanup;
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||
cleanup = ensure_python_env (get_current_arch (), current_language);
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while (arg && *arg && isspace (*arg))
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++arg;
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||
if (arg && *arg)
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||
{
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if (PyRun_SimpleString (arg))
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{
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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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}
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else
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{
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struct command_line *l = get_command_line (python_control, "");
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make_cleanup_free_command_lines (&l);
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execute_control_command_untraced (l);
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}
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do_cleanups (cleanup);
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}
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/* Transform a gdb parameters's value into a Python value. May return
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NULL (and set a Python exception) on error. Helper function for
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get_parameter. */
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static PyObject *
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parameter_to_python (struct cmd_list_element *cmd)
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{
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switch (cmd->var_type)
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{
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case var_string:
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case var_string_noescape:
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case var_optional_filename:
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case var_filename:
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case var_enum:
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{
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char *str = * (char **) cmd->var;
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if (! str)
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str = "";
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return PyString_Decode (str, strlen (str), host_charset (), NULL);
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||
}
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case var_boolean:
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{
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if (* (int *) cmd->var)
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Py_RETURN_TRUE;
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else
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Py_RETURN_FALSE;
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}
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||
case var_auto_boolean:
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{
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enum auto_boolean ab = * (enum auto_boolean *) cmd->var;
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if (ab == AUTO_BOOLEAN_TRUE)
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Py_RETURN_TRUE;
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else if (ab == AUTO_BOOLEAN_FALSE)
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Py_RETURN_FALSE;
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else
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Py_RETURN_NONE;
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}
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case var_integer:
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if ((* (int *) cmd->var) == INT_MAX)
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Py_RETURN_NONE;
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/* Fall through. */
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case var_zinteger:
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return PyLong_FromLong (* (int *) cmd->var);
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||
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case var_uinteger:
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{
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unsigned int val = * (unsigned int *) cmd->var;
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if (val == UINT_MAX)
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Py_RETURN_NONE;
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return PyLong_FromUnsignedLong (val);
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||
}
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||
}
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return PyErr_Format (PyExc_RuntimeError, "programmer error: unhandled type");
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||
}
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/* A Python function which returns a gdb parameter's value as a Python
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value. */
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static PyObject *
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gdbpy_parameter (PyObject *self, PyObject *args)
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{
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struct cmd_list_element *alias, *prefix, *cmd;
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char *arg, *newarg;
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int found = -1;
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volatile struct gdb_exception except;
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if (! PyArg_ParseTuple (args, "s", &arg))
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return NULL;
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newarg = concat ("show ", arg, (char *) NULL);
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TRY_CATCH (except, RETURN_MASK_ALL)
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{
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found = lookup_cmd_composition (newarg, &alias, &prefix, &cmd);
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}
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xfree (newarg);
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GDB_PY_HANDLE_EXCEPTION (except);
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if (!found)
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return PyErr_Format (PyExc_RuntimeError,
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"could not find parameter `%s'", arg);
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if (! cmd->var)
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return PyErr_Format (PyExc_RuntimeError, "`%s' is not a parameter", arg);
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return parameter_to_python (cmd);
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||
}
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||
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/* A Python function which evaluates a string using the gdb CLI. */
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static PyObject *
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execute_gdb_command (PyObject *self, PyObject *args)
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{
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struct cmd_list_element *alias, *prefix, *cmd;
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char *arg, *newarg;
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||
PyObject *from_tty_obj = NULL;
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int from_tty;
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int cmp;
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volatile struct gdb_exception except;
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if (! PyArg_ParseTuple (args, "s|O!", &arg, &PyBool_Type, &from_tty_obj))
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return NULL;
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||
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from_tty = 0;
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||
if (from_tty_obj)
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{
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cmp = PyObject_IsTrue (from_tty_obj);
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if (cmp < 0)
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||
return NULL;
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||
from_tty = cmp;
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||
}
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||
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||
TRY_CATCH (except, RETURN_MASK_ALL)
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{
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||
/* Copy the argument text in case the command modifies it. */
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char *copy = xstrdup (arg);
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struct cleanup *cleanup = make_cleanup (xfree, copy);
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execute_command (copy, from_tty);
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do_cleanups (cleanup);
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}
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GDB_PY_HANDLE_EXCEPTION (except);
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/* Do any commands attached to breakpoint we stopped at. */
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bpstat_do_actions ();
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Py_RETURN_NONE;
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||
}
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||
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||
/* Parse a string and evaluate it as an expression. */
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||
static PyObject *
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gdbpy_parse_and_eval (PyObject *self, PyObject *args)
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{
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char *expr_str;
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struct value *result = NULL;
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volatile struct gdb_exception except;
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||
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if (!PyArg_ParseTuple (args, "s", &expr_str))
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return NULL;
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||
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TRY_CATCH (except, RETURN_MASK_ALL)
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{
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result = parse_and_eval (expr_str);
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}
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GDB_PY_HANDLE_EXCEPTION (except);
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||
|
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return value_to_value_object (result);
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||
}
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||
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/* Read a file as Python code. STREAM is the input file; FILE is the
|
||
name of the file. */
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||
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void
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source_python_script (FILE *stream, char *file)
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{
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||
PyGILState_STATE state;
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||
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state = PyGILState_Ensure ();
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PyRun_SimpleFile (stream, file);
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||
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fclose (stream);
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PyGILState_Release (state);
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||
}
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||
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||
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||
|
||
/* Printing. */
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||
|
||
/* A python function to write a single string using gdb's filtered
|
||
output stream. */
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||
static PyObject *
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gdbpy_write (PyObject *self, PyObject *args)
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{
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char *arg;
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if (! PyArg_ParseTuple (args, "s", &arg))
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return NULL;
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printf_filtered ("%s", arg);
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Py_RETURN_NONE;
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||
}
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||
|
||
/* A python function to flush gdb's filtered output stream. */
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static PyObject *
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gdbpy_flush (PyObject *self, PyObject *args)
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{
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gdb_flush (gdb_stdout);
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Py_RETURN_NONE;
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||
}
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||
|
||
/* Print a python exception trace, or print nothing and clear the
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python exception, depending on gdbpy_should_print_stack. Only call
|
||
this if a python exception is set. */
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void
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gdbpy_print_stack (void)
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{
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||
if (gdbpy_should_print_stack)
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PyErr_Print ();
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||
else
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PyErr_Clear ();
|
||
}
|
||
|
||
|
||
|
||
/* The "current" objfile. This is set when gdb detects that a new
|
||
objfile has been loaded. It is only set for the duration of a call
|
||
to gdbpy_new_objfile; it is NULL at other times. */
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||
static struct objfile *gdbpy_current_objfile;
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||
|
||
/* The file name we attempt to read. */
|
||
#define GDBPY_AUTO_FILENAME "-gdb.py"
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||
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||
/* This is a new_objfile observer callback which loads python code
|
||
based on the path to the objfile. */
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||
static void
|
||
gdbpy_new_objfile (struct objfile *objfile)
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||
{
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||
char *realname;
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char *filename, *debugfile;
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||
int len;
|
||
FILE *input;
|
||
struct cleanup *cleanups;
|
||
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||
if (!gdbpy_auto_load || !objfile || !objfile->name)
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return;
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||
|
||
cleanups = ensure_python_env (get_objfile_arch (objfile), current_language);
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||
|
||
gdbpy_current_objfile = objfile;
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||
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realname = gdb_realpath (objfile->name);
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||
len = strlen (realname);
|
||
filename = xmalloc (len + sizeof (GDBPY_AUTO_FILENAME));
|
||
memcpy (filename, realname, len);
|
||
strcpy (filename + len, GDBPY_AUTO_FILENAME);
|
||
|
||
input = fopen (filename, "r");
|
||
debugfile = filename;
|
||
|
||
make_cleanup (xfree, filename);
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||
make_cleanup (xfree, realname);
|
||
|
||
if (!input && debug_file_directory)
|
||
{
|
||
/* Also try the same file in the separate debug info directory. */
|
||
debugfile = xmalloc (strlen (filename)
|
||
+ strlen (debug_file_directory) + 1);
|
||
strcpy (debugfile, debug_file_directory);
|
||
/* FILENAME is absolute, so we don't need a "/" here. */
|
||
strcat (debugfile, filename);
|
||
|
||
make_cleanup (xfree, debugfile);
|
||
input = fopen (debugfile, "r");
|
||
}
|
||
|
||
if (!input && gdb_datadir)
|
||
{
|
||
/* Also try the same file in a subdirectory of gdb's data
|
||
directory. */
|
||
debugfile = xmalloc (strlen (gdb_datadir) + strlen (filename)
|
||
+ strlen ("/auto-load") + 1);
|
||
strcpy (debugfile, gdb_datadir);
|
||
strcat (debugfile, "/auto-load");
|
||
/* FILENAME is absolute, so we don't need a "/" here. */
|
||
strcat (debugfile, filename);
|
||
|
||
make_cleanup (xfree, debugfile);
|
||
input = fopen (debugfile, "r");
|
||
}
|
||
|
||
if (input)
|
||
{
|
||
/* We don't want to throw an exception here -- but the user
|
||
would like to know that something went wrong. */
|
||
if (PyRun_SimpleFile (input, debugfile))
|
||
gdbpy_print_stack ();
|
||
fclose (input);
|
||
}
|
||
|
||
do_cleanups (cleanups);
|
||
gdbpy_current_objfile = NULL;
|
||
}
|
||
|
||
/* Return the current Objfile, or None if there isn't one. */
|
||
static PyObject *
|
||
gdbpy_get_current_objfile (PyObject *unused1, PyObject *unused2)
|
||
{
|
||
PyObject *result;
|
||
|
||
if (! gdbpy_current_objfile)
|
||
Py_RETURN_NONE;
|
||
|
||
result = objfile_to_objfile_object (gdbpy_current_objfile);
|
||
if (result)
|
||
Py_INCREF (result);
|
||
return result;
|
||
}
|
||
|
||
/* Return a sequence holding all the Objfiles. */
|
||
static PyObject *
|
||
gdbpy_objfiles (PyObject *unused1, PyObject *unused2)
|
||
{
|
||
struct objfile *objf;
|
||
PyObject *list;
|
||
|
||
list = PyList_New (0);
|
||
if (!list)
|
||
return NULL;
|
||
|
||
ALL_OBJFILES (objf)
|
||
{
|
||
PyObject *item = objfile_to_objfile_object (objf);
|
||
if (!item || PyList_Append (list, item) == -1)
|
||
{
|
||
Py_DECREF (list);
|
||
return NULL;
|
||
}
|
||
}
|
||
|
||
return list;
|
||
}
|
||
|
||
#else /* HAVE_PYTHON */
|
||
|
||
/* Dummy implementation of the gdb "python" command. */
|
||
|
||
static void
|
||
python_command (char *arg, int from_tty)
|
||
{
|
||
while (arg && *arg && isspace (*arg))
|
||
++arg;
|
||
if (arg && *arg)
|
||
error (_("Python scripting is not supported in this copy of GDB."));
|
||
else
|
||
{
|
||
struct command_line *l = get_command_line (python_control, "");
|
||
struct cleanup *cleanups = make_cleanup_free_command_lines (&l);
|
||
execute_control_command_untraced (l);
|
||
do_cleanups (cleanups);
|
||
}
|
||
}
|
||
|
||
void
|
||
eval_python_from_control_command (struct command_line *cmd)
|
||
{
|
||
error (_("Python scripting is not supported in this copy of GDB."));
|
||
}
|
||
|
||
void
|
||
source_python_script (FILE *stream, char *file)
|
||
{
|
||
fclose (stream);
|
||
throw_error (UNSUPPORTED_ERROR,
|
||
_("Python scripting is not supported in this copy of GDB."));
|
||
}
|
||
|
||
#endif /* HAVE_PYTHON */
|
||
|
||
|
||
|
||
/* Lists for 'maint set python' commands. */
|
||
|
||
static struct cmd_list_element *set_python_list;
|
||
static struct cmd_list_element *show_python_list;
|
||
|
||
/* Function for use by 'maint set python' prefix command. */
|
||
|
||
static void
|
||
set_python (char *args, int from_tty)
|
||
{
|
||
help_list (set_python_list, "maintenance set python ", -1, gdb_stdout);
|
||
}
|
||
|
||
/* Function for use by 'maint show python' prefix command. */
|
||
|
||
static void
|
||
show_python (char *args, int from_tty)
|
||
{
|
||
cmd_show_list (show_python_list, from_tty, "");
|
||
}
|
||
|
||
/* Initialize the Python code. */
|
||
|
||
/* Provide a prototype to silence -Wmissing-prototypes. */
|
||
extern initialize_file_ftype _initialize_python;
|
||
|
||
void
|
||
_initialize_python (void)
|
||
{
|
||
add_com ("python", class_obscure, python_command,
|
||
#ifdef HAVE_PYTHON
|
||
_("\
|
||
Evaluate a Python command.\n\
|
||
\n\
|
||
The command can be given as an argument, for instance:\n\
|
||
\n\
|
||
python print 23\n\
|
||
\n\
|
||
If no argument is given, the following lines are read and used\n\
|
||
as the Python commands. Type a line containing \"end\" to indicate\n\
|
||
the end of the command.")
|
||
#else /* HAVE_PYTHON */
|
||
_("\
|
||
Evaluate a Python command.\n\
|
||
\n\
|
||
Python scripting is not supported in this copy of GDB.\n\
|
||
This command is only a placeholder.")
|
||
#endif /* HAVE_PYTHON */
|
||
);
|
||
|
||
add_prefix_cmd ("python", no_class, show_python,
|
||
_("Prefix command for python maintenance settings."),
|
||
&show_python_list, "maintenance show python ", 0,
|
||
&maintenance_show_cmdlist);
|
||
add_prefix_cmd ("python", no_class, set_python,
|
||
_("Prefix command for python maintenance settings."),
|
||
&set_python_list, "maintenance set python ", 0,
|
||
&maintenance_set_cmdlist);
|
||
|
||
add_setshow_boolean_cmd ("print-stack", class_maintenance,
|
||
&gdbpy_should_print_stack, _("\
|
||
Enable or disable printing of Python stack dump on error."), _("\
|
||
Show whether Python stack will be printed on error."), _("\
|
||
Enables or disables printing of Python stack traces."),
|
||
NULL, NULL,
|
||
&set_python_list,
|
||
&show_python_list);
|
||
|
||
add_setshow_boolean_cmd ("auto-load", class_maintenance,
|
||
&gdbpy_auto_load, _("\
|
||
Enable or disable auto-loading of Python code when an object is opened."), _("\
|
||
Show whether Python code will be auto-loaded when an object is opened."), _("\
|
||
Enables or disables auto-loading of Python code when an object is opened."),
|
||
NULL, NULL,
|
||
&set_python_list,
|
||
&show_python_list);
|
||
|
||
#ifdef HAVE_PYTHON
|
||
Py_Initialize ();
|
||
PyEval_InitThreads ();
|
||
|
||
gdb_module = Py_InitModule ("gdb", GdbMethods);
|
||
|
||
/* The casts to (char*) are for python 2.4. */
|
||
PyModule_AddStringConstant (gdb_module, "VERSION", (char*) version);
|
||
PyModule_AddStringConstant (gdb_module, "HOST_CONFIG", (char*) host_name);
|
||
PyModule_AddStringConstant (gdb_module, "TARGET_CONFIG", (char*) target_name);
|
||
|
||
gdbpy_initialize_values ();
|
||
gdbpy_initialize_frames ();
|
||
gdbpy_initialize_commands ();
|
||
gdbpy_initialize_functions ();
|
||
gdbpy_initialize_types ();
|
||
gdbpy_initialize_objfile ();
|
||
gdbpy_initialize_lazy_string ();
|
||
|
||
PyRun_SimpleString ("import gdb");
|
||
PyRun_SimpleString ("gdb.pretty_printers = []");
|
||
|
||
observer_attach_new_objfile (gdbpy_new_objfile);
|
||
|
||
gdbpy_to_string_cst = PyString_FromString ("to_string");
|
||
gdbpy_children_cst = PyString_FromString ("children");
|
||
gdbpy_display_hint_cst = PyString_FromString ("display_hint");
|
||
gdbpy_doc_cst = PyString_FromString ("__doc__");
|
||
|
||
/* Create a couple objects which are used for Python's stdout and
|
||
stderr. */
|
||
PyRun_SimpleString ("\
|
||
import sys\n\
|
||
class GdbOutputFile:\n\
|
||
def close(self):\n\
|
||
# Do nothing.\n\
|
||
return None\n\
|
||
\n\
|
||
def isatty(self):\n\
|
||
return False\n\
|
||
\n\
|
||
def write(self, s):\n\
|
||
gdb.write(s)\n\
|
||
\n\
|
||
def writelines(self, iterable):\n\
|
||
for line in iterable:\n\
|
||
self.write(line)\n\
|
||
\n\
|
||
def flush(self):\n\
|
||
gdb.flush()\n\
|
||
\n\
|
||
sys.stderr = GdbOutputFile()\n\
|
||
sys.stdout = GdbOutputFile()\n\
|
||
");
|
||
|
||
/* Release the GIL while gdb runs. */
|
||
PyThreadState_Swap (NULL);
|
||
PyEval_ReleaseLock ();
|
||
|
||
#endif /* HAVE_PYTHON */
|
||
}
|
||
|
||
|
||
|
||
#if HAVE_PYTHON
|
||
|
||
static PyMethodDef GdbMethods[] =
|
||
{
|
||
{ "history", gdbpy_history, METH_VARARGS,
|
||
"Get a value from history" },
|
||
{ "execute", execute_gdb_command, METH_VARARGS,
|
||
"Execute a gdb command" },
|
||
{ "parameter", gdbpy_parameter, METH_VARARGS,
|
||
"Return a gdb parameter's value" },
|
||
|
||
{ "default_visualizer", gdbpy_default_visualizer, METH_VARARGS,
|
||
"Find the default visualizer for a Value." },
|
||
|
||
{ "current_objfile", gdbpy_get_current_objfile, METH_NOARGS,
|
||
"Return the current Objfile being loaded, or None." },
|
||
{ "objfiles", gdbpy_objfiles, METH_NOARGS,
|
||
"Return a sequence of all loaded objfiles." },
|
||
|
||
{ "selected_frame", gdbpy_selected_frame, METH_NOARGS,
|
||
"selected_frame () -> gdb.Frame.\n\
|
||
Return the selected frame object." },
|
||
{ "frame_stop_reason_string", gdbpy_frame_stop_reason_string, METH_VARARGS,
|
||
"stop_reason_string (Integer) -> String.\n\
|
||
Return a string explaining unwind stop reason." },
|
||
|
||
{ "lookup_type", (PyCFunction) gdbpy_lookup_type,
|
||
METH_VARARGS | METH_KEYWORDS,
|
||
"lookup_type (name [, block]) -> type\n\
|
||
Return a Type corresponding to the given name." },
|
||
|
||
{ "parse_and_eval", gdbpy_parse_and_eval, METH_VARARGS,
|
||
"parse_and_eval (String) -> Value.\n\
|
||
Parse String as an expression, evaluate it, and return the result as a Value."
|
||
},
|
||
|
||
{ "write", gdbpy_write, METH_VARARGS,
|
||
"Write a string using gdb's filtered stream." },
|
||
{ "flush", gdbpy_flush, METH_NOARGS,
|
||
"Flush gdb's filtered stdout stream." },
|
||
|
||
{NULL, NULL, 0, NULL}
|
||
};
|
||
|
||
#endif /* HAVE_PYTHON */
|