1 /* General python/gdb code
3 Copyright (C) 2008, 2009, 2010 Free Software Foundation, Inc.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
21 #include "arch-utils.h"
24 #include "cli/cli-script.h"
26 #include "progspace.h"
30 #include "exceptions.h"
34 /* True if we should print the stack when catching a Python error,
36 static int gdbpy_should_print_stack = 1;
41 #include "libiberty.h"
42 #include "cli/cli-decode.h"
45 #include "python-internal.h"
48 #include "gdbthread.h"
50 static PyMethodDef GdbMethods[];
54 /* Some string constants we may wish to use. */
55 PyObject *gdbpy_to_string_cst;
56 PyObject *gdbpy_children_cst;
57 PyObject *gdbpy_display_hint_cst;
58 PyObject *gdbpy_doc_cst;
59 PyObject *gdbpy_enabled_cst;
61 /* The GdbError exception. */
62 PyObject *gdbpy_gdberror_exc;
64 /* Architecture and language to be used in callbacks from
65 the Python interpreter. */
66 struct gdbarch *python_gdbarch;
67 const struct language_defn *python_language;
69 /* Restore global language and architecture and Python GIL state
70 when leaving the Python interpreter. */
74 PyGILState_STATE state;
75 struct gdbarch *gdbarch;
76 const struct language_defn *language;
80 restore_python_env (void *p)
82 struct python_env *env = (struct python_env *)p;
84 PyGILState_Release (env->state);
85 python_gdbarch = env->gdbarch;
86 python_language = env->language;
90 /* Called before entering the Python interpreter to install the
91 current language and architecture to be used for Python values. */
94 ensure_python_env (struct gdbarch *gdbarch,
95 const struct language_defn *language)
97 struct python_env *env = xmalloc (sizeof *env);
99 env->state = PyGILState_Ensure ();
100 env->gdbarch = python_gdbarch;
101 env->language = python_language;
103 python_gdbarch = gdbarch;
104 python_language = language;
106 return make_cleanup (restore_python_env, env);
110 /* Given a command_line, return a command string suitable for passing
111 to Python. Lines in the string are separated by newlines. The
112 return value is allocated using xmalloc and the caller is
113 responsible for freeing it. */
116 compute_python_string (struct command_line *l)
118 struct command_line *iter;
123 for (iter = l; iter; iter = iter->next)
124 size += strlen (iter->line) + 1;
126 script = xmalloc (size + 1);
128 for (iter = l; iter; iter = iter->next)
130 int len = strlen (iter->line);
132 strcpy (&script[here], iter->line);
134 script[here++] = '\n';
140 /* Take a command line structure representing a 'python' command, and
141 evaluate its body using the Python interpreter. */
144 eval_python_from_control_command (struct command_line *cmd)
148 struct cleanup *cleanup;
150 if (cmd->body_count != 1)
151 error (_("Invalid \"python\" block structure."));
153 cleanup = ensure_python_env (get_current_arch (), current_language);
155 script = compute_python_string (cmd->body_list[0]);
156 ret = PyRun_SimpleString (script);
160 gdbpy_print_stack ();
161 error (_("Error while executing Python code."));
164 do_cleanups (cleanup);
167 /* Implementation of the gdb "python" command. */
170 python_command (char *arg, int from_tty)
172 struct cleanup *cleanup;
174 cleanup = ensure_python_env (get_current_arch (), current_language);
175 while (arg && *arg && isspace (*arg))
179 if (PyRun_SimpleString (arg))
181 gdbpy_print_stack ();
182 error (_("Error while executing Python code."));
187 struct command_line *l = get_command_line (python_control, "");
189 make_cleanup_free_command_lines (&l);
190 execute_control_command_untraced (l);
193 do_cleanups (cleanup);
198 /* Transform a gdb parameters's value into a Python value. May return
199 NULL (and set a Python exception) on error. Helper function for
202 gdbpy_parameter_value (enum var_types type, void *var)
207 case var_string_noescape:
208 case var_optional_filename:
212 char *str = * (char **) var;
216 return PyString_Decode (str, strlen (str), host_charset (), NULL);
227 case var_auto_boolean:
229 enum auto_boolean ab = * (enum auto_boolean *) var;
231 if (ab == AUTO_BOOLEAN_TRUE)
233 else if (ab == AUTO_BOOLEAN_FALSE)
240 if ((* (int *) var) == INT_MAX)
244 return PyLong_FromLong (* (int *) var);
248 unsigned int val = * (unsigned int *) var;
252 return PyLong_FromUnsignedLong (val);
256 return PyErr_Format (PyExc_RuntimeError,
257 _("Programmer error: unhandled type."));
260 /* A Python function which returns a gdb parameter's value as a Python
264 gdbpy_parameter (PyObject *self, PyObject *args)
266 struct cmd_list_element *alias, *prefix, *cmd;
269 volatile struct gdb_exception except;
271 if (! PyArg_ParseTuple (args, "s", &arg))
274 newarg = concat ("show ", arg, (char *) NULL);
276 TRY_CATCH (except, RETURN_MASK_ALL)
278 found = lookup_cmd_composition (newarg, &alias, &prefix, &cmd);
281 GDB_PY_HANDLE_EXCEPTION (except);
283 return PyErr_Format (PyExc_RuntimeError,
284 _("Could not find parameter `%s'."), arg);
287 return PyErr_Format (PyExc_RuntimeError,
288 _("`%s' is not a parameter."), arg);
289 return gdbpy_parameter_value (cmd->var_type, cmd->var);
292 /* Wrapper for target_charset. */
295 gdbpy_target_charset (PyObject *self, PyObject *args)
297 const char *cset = target_charset (python_gdbarch);
299 return PyUnicode_Decode (cset, strlen (cset), host_charset (), NULL);
302 /* Wrapper for target_wide_charset. */
305 gdbpy_target_wide_charset (PyObject *self, PyObject *args)
307 const char *cset = target_wide_charset (python_gdbarch);
309 return PyUnicode_Decode (cset, strlen (cset), host_charset (), NULL);
312 /* A Python function which evaluates a string using the gdb CLI. */
315 execute_gdb_command (PyObject *self, PyObject *args, PyObject *kw)
318 PyObject *from_tty_obj = NULL, *to_string_obj = NULL;
319 int from_tty, to_string;
320 volatile struct gdb_exception except;
321 static char *keywords[] = {"command", "from_tty", "to_string", NULL };
324 if (! PyArg_ParseTupleAndKeywords (args, kw, "s|O!O!", keywords, &arg,
325 &PyBool_Type, &from_tty_obj,
326 &PyBool_Type, &to_string_obj))
332 int cmp = PyObject_IsTrue (from_tty_obj);
341 int cmp = PyObject_IsTrue (to_string_obj);
347 TRY_CATCH (except, RETURN_MASK_ALL)
349 /* Copy the argument text in case the command modifies it. */
350 char *copy = xstrdup (arg);
351 struct cleanup *cleanup = make_cleanup (xfree, copy);
354 result = execute_command_to_string (copy, from_tty);
358 execute_command (copy, from_tty);
361 do_cleanups (cleanup);
363 GDB_PY_HANDLE_EXCEPTION (except);
365 /* Do any commands attached to breakpoint we stopped at. */
366 bpstat_do_actions ();
370 PyObject *r = PyString_FromString (result);
377 /* Parse a string and evaluate it as an expression. */
379 gdbpy_parse_and_eval (PyObject *self, PyObject *args)
382 struct value *result = NULL;
383 volatile struct gdb_exception except;
385 if (!PyArg_ParseTuple (args, "s", &expr_str))
388 TRY_CATCH (except, RETURN_MASK_ALL)
390 result = parse_and_eval (expr_str);
392 GDB_PY_HANDLE_EXCEPTION (except);
394 return value_to_value_object (result);
397 /* Read a file as Python code. STREAM is the input file; FILE is the
399 STREAM is not closed, that is the caller's responsibility. */
402 source_python_script (FILE *stream, const char *file)
404 struct cleanup *cleanup;
406 cleanup = ensure_python_env (get_current_arch (), current_language);
408 /* Note: If an exception occurs python will print the traceback and
409 clear the error indicator. */
410 PyRun_SimpleFile (stream, file);
412 do_cleanups (cleanup);
419 /* A python function to write a single string using gdb's filtered
422 gdbpy_write (PyObject *self, PyObject *args)
426 if (! PyArg_ParseTuple (args, "s", &arg))
428 printf_filtered ("%s", arg);
432 /* A python function to flush gdb's filtered output stream. */
434 gdbpy_flush (PyObject *self, PyObject *args)
436 gdb_flush (gdb_stdout);
440 /* Print a python exception trace, or print nothing and clear the
441 python exception, depending on gdbpy_should_print_stack. Only call
442 this if a python exception is set. */
444 gdbpy_print_stack (void)
446 if (gdbpy_should_print_stack)
449 /* PyErr_Print doesn't necessarily end output with a newline.
450 This works because Python's stdout/stderr is fed through
460 /* Return the current Progspace.
461 There always is one. */
464 gdbpy_get_current_progspace (PyObject *unused1, PyObject *unused2)
468 result = pspace_to_pspace_object (current_program_space);
474 /* Return a sequence holding all the Progspaces. */
477 gdbpy_progspaces (PyObject *unused1, PyObject *unused2)
479 struct program_space *ps;
482 list = PyList_New (0);
488 PyObject *item = pspace_to_pspace_object (ps);
490 if (!item || PyList_Append (list, item) == -1)
502 /* The "current" objfile. This is set when gdb detects that a new
503 objfile has been loaded. It is only set for the duration of a call to
504 source_python_script_for_objfile; it is NULL at other times. */
505 static struct objfile *gdbpy_current_objfile;
507 /* Set the current objfile to OBJFILE and then read STREAM,FILE as
511 source_python_script_for_objfile (struct objfile *objfile,
512 FILE *stream, const char *file)
514 struct cleanup *cleanups;
516 cleanups = ensure_python_env (get_objfile_arch (objfile), current_language);
517 gdbpy_current_objfile = objfile;
519 /* Note: If an exception occurs python will print the traceback and
520 clear the error indicator. */
521 PyRun_SimpleFile (stream, file);
523 do_cleanups (cleanups);
524 gdbpy_current_objfile = NULL;
527 /* Return the current Objfile, or None if there isn't one. */
530 gdbpy_get_current_objfile (PyObject *unused1, PyObject *unused2)
534 if (! gdbpy_current_objfile)
537 result = objfile_to_objfile_object (gdbpy_current_objfile);
543 /* Return a sequence holding all the Objfiles. */
546 gdbpy_objfiles (PyObject *unused1, PyObject *unused2)
548 struct objfile *objf;
551 list = PyList_New (0);
557 PyObject *item = objfile_to_objfile_object (objf);
559 if (!item || PyList_Append (list, item) == -1)
569 #else /* HAVE_PYTHON */
571 /* Dummy implementation of the gdb "python" command. */
574 python_command (char *arg, int from_tty)
576 while (arg && *arg && isspace (*arg))
579 error (_("Python scripting is not supported in this copy of GDB."));
582 struct command_line *l = get_command_line (python_control, "");
583 struct cleanup *cleanups = make_cleanup_free_command_lines (&l);
585 execute_control_command_untraced (l);
586 do_cleanups (cleanups);
591 eval_python_from_control_command (struct command_line *cmd)
593 error (_("Python scripting is not supported in this copy of GDB."));
597 source_python_script (FILE *stream, const char *file)
599 throw_error (UNSUPPORTED_ERROR,
600 _("Python scripting is not supported in this copy of GDB."));
603 #endif /* HAVE_PYTHON */
607 /* Lists for 'maint set python' commands. */
609 struct cmd_list_element *set_python_list;
610 struct cmd_list_element *show_python_list;
612 /* Function for use by 'maint set python' prefix command. */
615 set_python (char *args, int from_tty)
617 help_list (set_python_list, "maintenance set python ", -1, gdb_stdout);
620 /* Function for use by 'maint show python' prefix command. */
623 show_python (char *args, int from_tty)
625 cmd_show_list (show_python_list, from_tty, "");
628 /* Initialize the Python code. */
630 /* Provide a prototype to silence -Wmissing-prototypes. */
631 extern initialize_file_ftype _initialize_python;
634 _initialize_python (void)
636 add_com ("python", class_obscure, python_command,
639 Evaluate a Python command.\n\
641 The command can be given as an argument, for instance:\n\
645 If no argument is given, the following lines are read and used\n\
646 as the Python commands. Type a line containing \"end\" to indicate\n\
647 the end of the command.")
648 #else /* HAVE_PYTHON */
650 Evaluate a Python command.\n\
652 Python scripting is not supported in this copy of GDB.\n\
653 This command is only a placeholder.")
654 #endif /* HAVE_PYTHON */
657 add_prefix_cmd ("python", no_class, show_python,
658 _("Prefix command for python maintenance settings."),
659 &show_python_list, "maintenance show python ", 0,
660 &maintenance_show_cmdlist);
661 add_prefix_cmd ("python", no_class, set_python,
662 _("Prefix command for python maintenance settings."),
663 &set_python_list, "maintenance set python ", 0,
664 &maintenance_set_cmdlist);
666 add_setshow_boolean_cmd ("print-stack", class_maintenance,
667 &gdbpy_should_print_stack, _("\
668 Enable or disable printing of Python stack dump on error."), _("\
669 Show whether Python stack will be printed on error."), _("\
670 Enables or disables printing of Python stack traces."),
676 #ifdef WITH_PYTHON_PATH
677 /* Work around problem where python gets confused about where it is,
678 and then can't find its libraries, etc.
679 NOTE: Python assumes the following layout:
681 /foo/lib/pythonX.Y/...
682 This must be done before calling Py_Initialize. */
683 Py_SetProgramName (concat (ldirname (python_libdir), SLASH_STRING, "bin",
684 SLASH_STRING, "python", NULL));
688 PyEval_InitThreads ();
690 gdb_module = Py_InitModule ("gdb", GdbMethods);
692 /* The casts to (char*) are for python 2.4. */
693 PyModule_AddStringConstant (gdb_module, "VERSION", (char*) version);
694 PyModule_AddStringConstant (gdb_module, "HOST_CONFIG", (char*) host_name);
695 PyModule_AddStringConstant (gdb_module, "TARGET_CONFIG", (char*) target_name);
699 gdb_pythondir = concat (gdb_datadir, SLASH_STRING, "python", NULL);
700 PyModule_AddStringConstant (gdb_module, "PYTHONDIR", gdb_pythondir);
701 xfree (gdb_pythondir);
704 gdbpy_gdberror_exc = PyErr_NewException ("gdb.GdbError", NULL, NULL);
705 PyModule_AddObject (gdb_module, "GdbError", gdbpy_gdberror_exc);
707 gdbpy_initialize_auto_load ();
708 gdbpy_initialize_values ();
709 gdbpy_initialize_frames ();
710 gdbpy_initialize_commands ();
711 gdbpy_initialize_symbols ();
712 gdbpy_initialize_symtabs ();
713 gdbpy_initialize_blocks ();
714 gdbpy_initialize_functions ();
715 gdbpy_initialize_parameters ();
716 gdbpy_initialize_types ();
717 gdbpy_initialize_pspace ();
718 gdbpy_initialize_objfile ();
719 gdbpy_initialize_breakpoints ();
720 gdbpy_initialize_lazy_string ();
721 gdbpy_initialize_thread ();
722 gdbpy_initialize_inferior ();
724 PyRun_SimpleString ("import gdb");
725 PyRun_SimpleString ("gdb.pretty_printers = []");
727 gdbpy_to_string_cst = PyString_FromString ("to_string");
728 gdbpy_children_cst = PyString_FromString ("children");
729 gdbpy_display_hint_cst = PyString_FromString ("display_hint");
730 gdbpy_doc_cst = PyString_FromString ("__doc__");
731 gdbpy_enabled_cst = PyString_FromString ("enabled");
733 /* Create a couple objects which are used for Python's stdout and
735 PyRun_SimpleString ("\
737 class GdbOutputFile:\n\
745 def write(self, s):\n\
748 def writelines(self, iterable):\n\
749 for line in iterable:\n\
755 sys.stderr = GdbOutputFile()\n\
756 sys.stdout = GdbOutputFile()\n\
758 # GDB's python scripts are stored inside gdb.PYTHONDIR. So insert\n\
759 # that directory name at the start of sys.path to allow the Python\n\
760 # interpreter to find them.\n\
761 sys.path.insert(0, gdb.PYTHONDIR)\n\
763 # The gdb module is implemented in C rather than in Python. As a result,\n\
764 # the associated __init.py__ script is not not executed by default when\n\
765 # the gdb module gets imported. Execute that script manually if it exists.\n\
766 gdb.__path__ = [gdb.PYTHONDIR + '/gdb']\n\
767 from os.path import exists\n\
768 ipy = gdb.PYTHONDIR + '/gdb/__init__.py'\n\
773 /* Release the GIL while gdb runs. */
774 PyThreadState_Swap (NULL);
775 PyEval_ReleaseLock ();
777 #endif /* HAVE_PYTHON */
784 static PyMethodDef GdbMethods[] =
786 { "history", gdbpy_history, METH_VARARGS,
787 "Get a value from history" },
788 { "execute", (PyCFunction) execute_gdb_command, METH_VARARGS | METH_KEYWORDS,
789 "Execute a gdb command" },
790 { "parameter", gdbpy_parameter, METH_VARARGS,
791 "Return a gdb parameter's value" },
793 { "breakpoints", gdbpy_breakpoints, METH_NOARGS,
794 "Return a tuple of all breakpoint objects" },
796 { "default_visualizer", gdbpy_default_visualizer, METH_VARARGS,
797 "Find the default visualizer for a Value." },
799 { "current_progspace", gdbpy_get_current_progspace, METH_NOARGS,
800 "Return the current Progspace." },
801 { "progspaces", gdbpy_progspaces, METH_NOARGS,
802 "Return a sequence of all progspaces." },
804 { "current_objfile", gdbpy_get_current_objfile, METH_NOARGS,
805 "Return the current Objfile being loaded, or None." },
806 { "objfiles", gdbpy_objfiles, METH_NOARGS,
807 "Return a sequence of all loaded objfiles." },
809 { "selected_frame", gdbpy_selected_frame, METH_NOARGS,
810 "selected_frame () -> gdb.Frame.\n\
811 Return the selected frame object." },
812 { "frame_stop_reason_string", gdbpy_frame_stop_reason_string, METH_VARARGS,
813 "stop_reason_string (Integer) -> String.\n\
814 Return a string explaining unwind stop reason." },
816 { "lookup_type", (PyCFunction) gdbpy_lookup_type,
817 METH_VARARGS | METH_KEYWORDS,
818 "lookup_type (name [, block]) -> type\n\
819 Return a Type corresponding to the given name." },
820 { "lookup_symbol", (PyCFunction) gdbpy_lookup_symbol,
821 METH_VARARGS | METH_KEYWORDS,
822 "lookup_symbol (name [, block] [, domain]) -> (symbol, is_field_of_this)\n\
823 Return a tuple with the symbol corresponding to the given name (or None) and\n\
824 a boolean indicating if name is a field of the current implied argument\n\
825 `this' (when the current language is object-oriented)." },
826 { "block_for_pc", gdbpy_block_for_pc, METH_VARARGS,
827 "Return the block containing the given pc value, or None." },
828 { "parse_and_eval", gdbpy_parse_and_eval, METH_VARARGS,
829 "parse_and_eval (String) -> Value.\n\
830 Parse String as an expression, evaluate it, and return the result as a Value."
833 { "target_charset", gdbpy_target_charset, METH_NOARGS,
834 "target_charset () -> string.\n\
835 Return the name of the current target charset." },
836 { "target_wide_charset", gdbpy_target_wide_charset, METH_NOARGS,
837 "target_wide_charset () -> string.\n\
838 Return the name of the current target wide charset." },
840 { "string_to_argv", gdbpy_string_to_argv, METH_VARARGS,
841 "string_to_argv (String) -> Array.\n\
842 Parse String and return an argv-like array.\n\
843 Arguments are separate by spaces and may be quoted."
846 { "write", gdbpy_write, METH_VARARGS,
847 "Write a string using gdb's filtered stream." },
848 { "flush", gdbpy_flush, METH_NOARGS,
849 "Flush gdb's filtered stdout stream." },
850 { "selected_thread", gdbpy_selected_thread, METH_NOARGS,
851 "selected_thread () -> gdb.InferiorThread.\n\
852 Return the selected thread object." },
853 { "inferiors", gdbpy_inferiors, METH_NOARGS,
854 "inferiors () -> (gdb.Inferior, ...).\n\
855 Return a tuple containing all inferiors." },
856 {NULL, NULL, 0, NULL}
859 #endif /* HAVE_PYTHON */