434 lines
11 KiB
C
434 lines
11 KiB
C
/* General python/gdb code
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Copyright (C) 2008 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 "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 <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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#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 "exceptions.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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PyObject *gdb_module;
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static PyObject *get_parameter (PyObject *, PyObject *);
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static PyObject *execute_gdb_command (PyObject *, PyObject *);
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static PyObject *gdbpy_write (PyObject *, PyObject *);
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static PyObject *gdbpy_flush (PyObject *, PyObject *);
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static PyMethodDef GdbMethods[] =
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{
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{ "get_value_from_history", gdbpy_get_value_from_history, METH_VARARGS,
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"Get a value from history" },
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{ "execute", execute_gdb_command, METH_VARARGS,
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"Execute a gdb command" },
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{ "get_parameter", get_parameter, METH_VARARGS,
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"Return a gdb parameter's value" },
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{ "write", gdbpy_write, METH_VARARGS,
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"Write a string using gdb's filtered stream." },
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{ "flush", gdbpy_flush, METH_NOARGS,
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"Flush gdb's filtered stdout stream." },
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{NULL, NULL, 0, NULL}
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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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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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char *script;
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if (cmd->body_count != 1)
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error (_("Invalid \"python\" block structure."));
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script = compute_python_string (cmd->body_list[0]);
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PyRun_SimpleString (script);
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xfree (script);
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if (PyErr_Occurred ())
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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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/* Implementation of the gdb "python" command. */
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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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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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PyRun_SimpleString (arg);
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if (PyErr_Occurred ())
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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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struct cleanup *cleanups = make_cleanup_free_command_lines (&l);
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execute_control_command_untraced (l);
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do_cleanups (cleanups);
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}
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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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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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get_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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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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if (! lookup_cmd_composition (newarg, &alias, &prefix, &cmd))
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{
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xfree (newarg);
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return PyErr_Format (PyExc_RuntimeError,
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"could not find variable `%s'", arg);
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}
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}
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xfree (newarg);
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GDB_PY_HANDLE_EXCEPTION (except);
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if (! cmd->var)
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return PyErr_Format (PyExc_RuntimeError, "`%s' is not a variable", arg);
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return parameter_to_python (cmd);
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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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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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TRY_CATCH (except, RETURN_MASK_ALL)
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{
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execute_command (arg, 0);
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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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/* Printing. */
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/* A python function to write a single string using gdb's filtered
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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
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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 ();
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}
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#else /* HAVE_PYTHON */
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/* Dummy implementation of the gdb "python" command. */
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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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while (arg && *arg && isspace (*arg))
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++arg;
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if (arg && *arg)
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error (_("Python scripting is not supported in this copy of GDB."));
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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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struct cleanup *cleanups = make_cleanup_free_command_lines (&l);
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execute_control_command_untraced (l);
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do_cleanups (cleanups);
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}
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}
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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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error (_("Python scripting is not supported in this copy of GDB."));
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}
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#endif /* HAVE_PYTHON */
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/* Lists for 'maint set python' commands. */
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static struct cmd_list_element *set_python_list;
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static struct cmd_list_element *show_python_list;
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/* Function for use by 'maint set python' prefix command. */
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static void
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set_python (char *args, int from_tty)
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{
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help_list (set_python_list, "maintenance set python ", -1, gdb_stdout);
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}
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/* Function for use by 'maint show python' prefix command. */
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static void
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show_python (char *args, int from_tty)
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{
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cmd_show_list (show_python_list, from_tty, "");
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}
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/* Initialize the Python code. */
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void
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_initialize_python (void)
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{
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add_com ("python", class_obscure, python_command,
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#ifdef HAVE_PYTHON
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_("\
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Evaluate a Python command.\n\
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\n\
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The command can be given as an argument, for instance:\n\
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\n\
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python print 23\n\
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\n\
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If no argument is given, the following lines are read and used\n\
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as the Python commands. Type a line containing \"end\" to indicate\n\
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the end of the command.")
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#else /* HAVE_PYTHON */
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_("\
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Evaluate a Python command.\n\
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\n\
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Python scripting is not supported in this copy of GDB.\n\
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This command is only a placeholder.")
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#endif /* HAVE_PYTHON */
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);
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add_prefix_cmd ("python", no_class, show_python,
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_("Prefix command for python maintenance settings."),
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&show_python_list, "maintenance show python ", 0,
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&maintenance_show_cmdlist);
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add_prefix_cmd ("python", no_class, set_python,
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_("Prefix command for python maintenance settings."),
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&set_python_list, "maintenance set python ", 0,
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&maintenance_set_cmdlist);
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add_setshow_boolean_cmd ("print-stack", class_maintenance,
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&gdbpy_should_print_stack, _("\
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Enable or disable printing of Python stack dump on error."), _("\
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Show whether Python stack will be printed on error."), _("\
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Enables or disables printing of Python stack traces."),
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NULL, NULL,
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&set_python_list,
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&show_python_list);
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#ifdef HAVE_PYTHON
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Py_Initialize ();
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gdb_module = Py_InitModule ("gdb", GdbMethods);
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/* The casts to (char*) are for python 2.4. */
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PyModule_AddStringConstant (gdb_module, "VERSION", (char*) version);
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PyModule_AddStringConstant (gdb_module, "HOST_CONFIG", (char*) host_name);
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PyModule_AddStringConstant (gdb_module, "TARGET_CONFIG", (char*) target_name);
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gdbpy_initialize_values ();
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PyRun_SimpleString ("import gdb");
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/* Create a couple objects which are used for Python's stdout and
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stderr. */
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PyRun_SimpleString ("\
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import sys\n\
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class GdbOutputFile:\n\
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def close(self):\n\
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# Do nothing.\n\
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return None\n\
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\n\
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def isatty(self):\n\
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return False\n\
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\n\
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def write(self, s):\n\
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gdb.write(s)\n\
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\n\
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def writelines(self, iterable):\n\
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for line in iterable:\n\
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self.write(line)\n\
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\n\
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def flush(self):\n\
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gdb.flush()\n\
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\n\
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sys.stderr = GdbOutputFile()\n\
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sys.stdout = GdbOutputFile()\n\
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");
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#endif /* HAVE_PYTHON */
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}
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