| /* General python/gdb code |
| |
| Copyright (C) 2008 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 <ctype.h> |
| |
| /* True if we should print the stack when catching a Python error, |
| false otherwise. */ |
| static int gdbpy_should_print_stack = 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" |
| |
| |
| PyObject *gdb_module; |
| |
| static PyObject *get_parameter (PyObject *, PyObject *); |
| static PyObject *execute_gdb_command (PyObject *, PyObject *); |
| static PyObject *gdbpy_write (PyObject *, PyObject *); |
| static PyObject *gdbpy_flush (PyObject *, PyObject *); |
| |
| static PyMethodDef GdbMethods[] = |
| { |
| { "execute", execute_gdb_command, METH_VARARGS, |
| "Execute a gdb command" }, |
| { "get_parameter", get_parameter, METH_VARARGS, |
| "Return a gdb parameter's 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} |
| }; |
| |
| /* 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) |
| { |
| char *script; |
| |
| if (cmd->body_count != 1) |
| error (_("Invalid \"python\" block structure.")); |
| |
| script = compute_python_string (cmd->body_list[0]); |
| PyRun_SimpleString (script); |
| xfree (script); |
| if (PyErr_Occurred ()) |
| { |
| gdbpy_print_stack (); |
| error (_("error while executing Python code")); |
| } |
| } |
| |
| /* Implementation of the gdb "python" command. */ |
| |
| static void |
| python_command (char *arg, int from_tty) |
| { |
| while (arg && *arg && isspace (*arg)) |
| ++arg; |
| if (arg && *arg) |
| { |
| PyRun_SimpleString (arg); |
| if (PyErr_Occurred ()) |
| { |
| gdbpy_print_stack (); |
| error (_("error while executing Python code")); |
| } |
| } |
| 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); |
| } |
| } |
| |
| |
| |
| /* 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 * |
| get_parameter (PyObject *self, PyObject *args) |
| { |
| struct cmd_list_element *alias, *prefix, *cmd; |
| char *arg, *newarg; |
| 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) |
| { |
| if (! lookup_cmd_composition (newarg, &alias, &prefix, &cmd)) |
| { |
| xfree (newarg); |
| return PyErr_Format (PyExc_RuntimeError, |
| "could not find variable `%s'", arg); |
| } |
| } |
| xfree (newarg); |
| GDB_PY_HANDLE_EXCEPTION (except); |
| |
| if (! cmd->var) |
| return PyErr_Format (PyExc_RuntimeError, "`%s' is not a variable", 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; |
| volatile struct gdb_exception except; |
| |
| if (! PyArg_ParseTuple (args, "s", &arg)) |
| return NULL; |
| |
| TRY_CATCH (except, RETURN_MASK_ALL) |
| { |
| execute_command (arg, 0); |
| } |
| 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 (); |
| } |
| |
| #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. */ |
| |
| 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); |
| |
| #ifdef HAVE_PYTHON |
| Py_Initialize (); |
| |
| 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); |
| |
| PyRun_SimpleString ("import gdb"); |
| |
| /* 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\ |
| "); |
| #endif /* HAVE_PYTHON */ |
| } |