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/* General python/gdb code
Copyright (C) 2008, 2009 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "command.h"
#include "ui-out.h"
#include "cli/cli-script.h"
#include "gdbcmd.h"
#include "objfiles.h"
#include "observer.h"
#include <ctype.h>
/* True if we should print the stack when catching a Python error,
false otherwise. */
static int gdbpy_should_print_stack = 1;
/* This is true if we should auto-load python code when an objfile is
opened, false otherwise. */
static int gdbpy_auto_load = 1;
#ifdef HAVE_PYTHON
#include "python.h"
#include "libiberty.h"
#include "cli/cli-decode.h"
#include "charset.h"
#include "top.h"
#include "exceptions.h"
#include "python-internal.h"
#include "version.h"
#include "target.h"
#include "gdbthread.h"
static PyMethodDef GdbMethods[];
PyObject *gdb_module;
/* Some string constants we may wish to use. */
PyObject *gdbpy_to_string_cst;
PyObject *gdbpy_children_cst;
PyObject *gdbpy_display_hint_cst;
PyObject *gdbpy_doc_cst;
/* Given a command_line, return a command string suitable for passing
to Python. Lines in the string are separated by newlines. The
return value is allocated using xmalloc and the caller is
responsible for freeing it. */
static char *
compute_python_string (struct command_line *l)
{
struct command_line *iter;
char *script = NULL;
int size = 0;
int here;
for (iter = l; iter; iter = iter->next)
size += strlen (iter->line) + 1;
script = xmalloc (size + 1);
here = 0;
for (iter = l; iter; iter = iter->next)
{
int len = strlen (iter->line);
strcpy (&script[here], iter->line);
here += len;
script[here++] = '\n';
}
script[here] = '\0';
return script;
}
/* Take a command line structure representing a 'python' command, and
evaluate its body using the Python interpreter. */
void
eval_python_from_control_command (struct command_line *cmd)
{
int ret;
char *script;
struct cleanup *cleanup;
PyGILState_STATE state;
if (cmd->body_count != 1)
error (_("Invalid \"python\" block structure."));
state = PyGILState_Ensure ();
cleanup = make_cleanup_py_restore_gil (&state);
script = compute_python_string (cmd->body_list[0]);
ret = PyRun_SimpleString (script);
xfree (script);
if (ret)
{
gdbpy_print_stack ();
error (_("Error while executing Python code."));
}
do_cleanups (cleanup);
}
/* Implementation of the gdb "python" command. */
static void
python_command (char *arg, int from_tty)
{
struct cleanup *cleanup;
PyGILState_STATE state;
state = PyGILState_Ensure ();
cleanup = make_cleanup_py_restore_gil (&state);
while (arg && *arg && isspace (*arg))
++arg;
if (arg && *arg)
{
if (PyRun_SimpleString (arg))
{
gdbpy_print_stack ();
error (_("Error while executing Python code."));
}
}
else
{
struct command_line *l = get_command_line (python_control, "");
make_cleanup_free_command_lines (&l);
execute_control_command_untraced (l);
}
do_cleanups (cleanup);
}
/* Transform a gdb parameters's value into a Python value. May return
NULL (and set a Python exception) on error. Helper function for
get_parameter. */
static PyObject *
parameter_to_python (struct cmd_list_element *cmd)
{
switch (cmd->var_type)
{
case var_string:
case var_string_noescape:
case var_optional_filename:
case var_filename:
case var_enum:
{
char *str = * (char **) cmd->var;
if (! str)
str = "";
return PyString_Decode (str, strlen (str), host_charset (), NULL);
}
case var_boolean:
{
if (* (int *) cmd->var)
Py_RETURN_TRUE;
else
Py_RETURN_FALSE;
}
case var_auto_boolean:
{
enum auto_boolean ab = * (enum auto_boolean *) cmd->var;
if (ab == AUTO_BOOLEAN_TRUE)
Py_RETURN_TRUE;
else if (ab == AUTO_BOOLEAN_FALSE)
Py_RETURN_FALSE;
else
Py_RETURN_NONE;
}
case var_integer:
if ((* (int *) cmd->var) == INT_MAX)
Py_RETURN_NONE;
/* Fall through. */
case var_zinteger:
return PyLong_FromLong (* (int *) cmd->var);
case var_uinteger:
{
unsigned int val = * (unsigned int *) cmd->var;
if (val == UINT_MAX)
Py_RETURN_NONE;
return PyLong_FromUnsignedLong (val);
}
}
return PyErr_Format (PyExc_RuntimeError, "programmer error: unhandled type");
}
/* A Python function which returns a gdb parameter's value as a Python
value. */
static PyObject *
gdbpy_parameter (PyObject *self, PyObject *args)
{
struct cmd_list_element *alias, *prefix, *cmd;
char *arg, *newarg;
int found = -1;
volatile struct gdb_exception except;
if (! PyArg_ParseTuple (args, "s", &arg))
return NULL;
newarg = concat ("show ", arg, (char *) NULL);
TRY_CATCH (except, RETURN_MASK_ALL)
{
found = lookup_cmd_composition (newarg, &alias, &prefix, &cmd);
}
xfree (newarg);
GDB_PY_HANDLE_EXCEPTION (except);
if (!found)
return PyErr_Format (PyExc_RuntimeError,
"could not find parameter `%s'", arg);
if (! cmd->var)
return PyErr_Format (PyExc_RuntimeError, "`%s' is not a parameter", arg);
return parameter_to_python (cmd);
}
/* A Python function which evaluates a string using the gdb CLI. */
static PyObject *
execute_gdb_command (PyObject *self, PyObject *args)
{
struct cmd_list_element *alias, *prefix, *cmd;
char *arg, *newarg;
PyObject *from_tty_obj = NULL;
int from_tty;
int cmp;
volatile struct gdb_exception except;
if (! PyArg_ParseTuple (args, "s|O!", &arg, &PyBool_Type, &from_tty_obj))
return NULL;
from_tty = 0;
if (from_tty_obj)
{
cmp = PyObject_IsTrue (from_tty_obj);
if (cmp < 0)
return NULL;
from_tty = cmp;
}
TRY_CATCH (except, RETURN_MASK_ALL)
{
execute_command (arg, from_tty);
}
GDB_PY_HANDLE_EXCEPTION (except);
/* Do any commands attached to breakpoint we stopped at. */
bpstat_do_actions ();
Py_RETURN_NONE;
}
/* Printing. */
/* A python function to write a single string using gdb's filtered
output stream. */
static PyObject *
gdbpy_write (PyObject *self, PyObject *args)
{
char *arg;
if (! PyArg_ParseTuple (args, "s", &arg))
return NULL;
printf_filtered ("%s", arg);
Py_RETURN_NONE;
}
/* A python function to flush gdb's filtered output stream. */
static PyObject *
gdbpy_flush (PyObject *self, PyObject *args)
{
gdb_flush (gdb_stdout);
Py_RETURN_NONE;
}
/* Print a python exception trace, or print nothing and clear the
python exception, depending on gdbpy_should_print_stack. Only call
this if a python exception is set. */
void
gdbpy_print_stack (void)
{
if (gdbpy_should_print_stack)
PyErr_Print ();
else
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. */
static struct objfile *gdbpy_current_objfile;
/* The file name we attempt to read. */
#define GDBPY_AUTO_FILENAME "-gdb.py"
/* This is a new_objfile observer callback which loads python code
based on the path to the objfile. */
static void
gdbpy_new_objfile (struct objfile *objfile)
{
char *realname;
char *filename, *debugfile;
int len;
FILE *input;
PyGILState_STATE state;
struct cleanup *cleanups;
if (!gdbpy_auto_load || !objfile || !objfile->name)
return;
state = PyGILState_Ensure ();
gdbpy_current_objfile = objfile;
realname = gdb_realpath (objfile->name);
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;
cleanups = make_cleanup (xfree, filename);
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;
PyGILState_Release (state);
}
/* 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."));
}
#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 ();
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." },
{ "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 */
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