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Copy pathpython.c
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2110 lines (1740 loc) · 58.7 KB
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/* General python/gdb code
Copyright (C) 2008-2019 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 "arch-utils.h"
#include "command.h"
#include "ui-out.h"
#include "cli/cli-script.h"
#include "gdbcmd.h"
#include "progspace.h"
#include "objfiles.h"
#include "value.h"
#include "language.h"
#include "event-loop.h"
#include "serial.h"
#include "readline/tilde.h"
#include "python.h"
#include "extension-priv.h"
#include "cli/cli-utils.h"
#include <ctype.h>
#include "location.h"
#include "ser-event.h"
/* Declared constants and enum for python stack printing. */
static const char python_excp_none[] = "none";
static const char python_excp_full[] = "full";
static const char python_excp_message[] = "message";
/* "set python print-stack" choices. */
static const char *const python_excp_enums[] =
{
python_excp_none,
python_excp_full,
python_excp_message,
NULL
};
/* The exception printing variable. 'full' if we want to print the
error message and stack, 'none' if we want to print nothing, and
'message' if we only want to print the error message. 'message' is
the default. */
static const char *gdbpy_should_print_stack = python_excp_message;
#ifdef HAVE_PYTHON
/* Forward decls, these are defined later. */
extern const struct extension_language_script_ops python_extension_script_ops;
extern const struct extension_language_ops python_extension_ops;
#endif
/* The main struct describing GDB's interface to the Python
extension language. */
const struct extension_language_defn extension_language_python =
{
EXT_LANG_PYTHON,
"python",
"Python",
".py",
"-gdb.py",
python_control,
#ifdef HAVE_PYTHON
&python_extension_script_ops,
&python_extension_ops
#else
NULL,
NULL
#endif
};
#ifdef HAVE_PYTHON
#include "cli/cli-decode.h"
#include "charset.h"
#include "top.h"
#include "python-internal.h"
#include "linespec.h"
#include "source.h"
#include "common/version.h"
#include "target.h"
#include "gdbthread.h"
#include "interps.h"
#include "event-top.h"
#include "py-event.h"
/* True if Python has been successfully initialized, false
otherwise. */
int gdb_python_initialized;
extern PyMethodDef python_GdbMethods[];
#ifdef IS_PY3K
extern struct PyModuleDef python_GdbModuleDef;
#endif
PyObject *gdb_module;
PyObject *gdb_python_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;
PyObject *gdbpy_enabled_cst;
PyObject *gdbpy_value_cst;
/* The GdbError exception. */
PyObject *gdbpy_gdberror_exc;
/* The `gdb.error' base class. */
PyObject *gdbpy_gdb_error;
/* The `gdb.MemoryError' exception. */
PyObject *gdbpy_gdb_memory_error;
static script_sourcer_func gdbpy_source_script;
static objfile_script_sourcer_func gdbpy_source_objfile_script;
static objfile_script_executor_func gdbpy_execute_objfile_script;
static void gdbpy_finish_initialization
(const struct extension_language_defn *);
static int gdbpy_initialized (const struct extension_language_defn *);
static void gdbpy_eval_from_control_command
(const struct extension_language_defn *, struct command_line *cmd);
static void gdbpy_start_type_printers (const struct extension_language_defn *,
struct ext_lang_type_printers *);
static enum ext_lang_rc gdbpy_apply_type_printers
(const struct extension_language_defn *,
const struct ext_lang_type_printers *, struct type *, char **);
static void gdbpy_free_type_printers (const struct extension_language_defn *,
struct ext_lang_type_printers *);
static void gdbpy_set_quit_flag (const struct extension_language_defn *);
static int gdbpy_check_quit_flag (const struct extension_language_defn *);
static enum ext_lang_rc gdbpy_before_prompt_hook
(const struct extension_language_defn *, const char *current_gdb_prompt);
/* The interface between gdb proper and loading of python scripts. */
const struct extension_language_script_ops python_extension_script_ops =
{
gdbpy_source_script,
gdbpy_source_objfile_script,
gdbpy_execute_objfile_script,
gdbpy_auto_load_enabled
};
/* The interface between gdb proper and python extensions. */
const struct extension_language_ops python_extension_ops =
{
gdbpy_finish_initialization,
gdbpy_initialized,
gdbpy_eval_from_control_command,
gdbpy_start_type_printers,
gdbpy_apply_type_printers,
gdbpy_free_type_printers,
gdbpy_apply_val_pretty_printer,
gdbpy_apply_frame_filter,
gdbpy_preserve_values,
gdbpy_breakpoint_has_cond,
gdbpy_breakpoint_cond_says_stop,
gdbpy_set_quit_flag,
gdbpy_check_quit_flag,
gdbpy_before_prompt_hook,
gdbpy_get_matching_xmethod_workers,
};
/* Architecture and language to be used in callbacks from
the Python interpreter. */
struct gdbarch *python_gdbarch;
const struct language_defn *python_language;
gdbpy_enter::gdbpy_enter (struct gdbarch *gdbarch,
const struct language_defn *language)
: m_gdbarch (python_gdbarch),
m_language (python_language)
{
/* We should not ever enter Python unless initialized. */
if (!gdb_python_initialized)
error (_("Python not initialized"));
m_previous_active = set_active_ext_lang (&extension_language_python);
m_state = PyGILState_Ensure ();
python_gdbarch = gdbarch;
python_language = language;
/* Save it and ensure ! PyErr_Occurred () afterwards. */
m_error.emplace ();
}
gdbpy_enter::~gdbpy_enter ()
{
/* Leftover Python error is forbidden by Python Exception Handling. */
if (PyErr_Occurred ())
{
/* This order is similar to the one calling error afterwards. */
gdbpy_print_stack ();
warning (_("internal error: Unhandled Python exception"));
}
m_error->restore ();
PyGILState_Release (m_state);
python_gdbarch = m_gdbarch;
python_language = m_language;
restore_active_ext_lang (m_previous_active);
}
/* Set the quit flag. */
static void
gdbpy_set_quit_flag (const struct extension_language_defn *extlang)
{
PyErr_SetInterrupt ();
}
/* Return true if the quit flag has been set, false otherwise. */
static int
gdbpy_check_quit_flag (const struct extension_language_defn *extlang)
{
return PyOS_InterruptOccurred ();
}
/* Evaluate a Python command like PyRun_SimpleString, but uses
Py_single_input which prints the result of expressions, and does
not automatically print the stack on errors. */
static int
eval_python_command (const char *command)
{
PyObject *m, *d;
m = PyImport_AddModule ("__main__");
if (m == NULL)
return -1;
d = PyModule_GetDict (m);
if (d == NULL)
return -1;
gdbpy_ref<> v (PyRun_StringFlags (command, Py_single_input, d, d, NULL));
if (v == NULL)
return -1;
#ifndef IS_PY3K
if (Py_FlushLine ())
PyErr_Clear ();
#endif
return 0;
}
/* Implementation of the gdb "python-interactive" command. */
static void
python_interactive_command (const char *arg, int from_tty)
{
struct ui *ui = current_ui;
int err;
scoped_restore save_async = make_scoped_restore (¤t_ui->async, 0);
arg = skip_spaces (arg);
gdbpy_enter enter_py (get_current_arch (), current_language);
if (arg && *arg)
{
std::string script = std::string (arg) + "\n";
err = eval_python_command (script.c_str ());
}
else
{
err = PyRun_InteractiveLoop (ui->instream, "<stdin>");
dont_repeat ();
}
if (err)
{
gdbpy_print_stack ();
error (_("Error while executing Python code."));
}
}
/* A wrapper around PyRun_SimpleFile. FILE is the Python script to run
named FILENAME.
On Windows hosts few users would build Python themselves (this is no
trivial task on this platform), and thus use binaries built by
someone else instead. There may happen situation where the Python
library and GDB are using two different versions of the C runtime
library. Python, being built with VC, would use one version of the
msvcr DLL (Eg. msvcr100.dll), while MinGW uses msvcrt.dll.
A FILE * from one runtime does not necessarily operate correctly in
the other runtime.
To work around this potential issue, we create on Windows hosts the
FILE object using Python routines, thus making sure that it is
compatible with the Python library. */
static void
python_run_simple_file (FILE *file, const char *filename)
{
#ifndef _WIN32
PyRun_SimpleFile (file, filename);
#else /* _WIN32 */
/* Because we have a string for a filename, and are using Python to
open the file, we need to expand any tilde in the path first. */
gdb::unique_xmalloc_ptr<char> full_path (tilde_expand (filename));
gdbpy_ref<> python_file (PyFile_FromString (full_path.get (), (char *) "r"));
if (python_file == NULL)
{
gdbpy_print_stack ();
error (_("Error while opening file: %s"), full_path.get ());
}
PyRun_SimpleFile (PyFile_AsFile (python_file.get ()), filename);
#endif /* _WIN32 */
}
/* Given a command_line, return a command string suitable for passing
to Python. Lines in the string are separated by newlines. */
static std::string
compute_python_string (struct command_line *l)
{
struct command_line *iter;
std::string script;
for (iter = l; iter; iter = iter->next)
{
script += iter->line;
script += '\n';
}
return script;
}
/* Take a command line structure representing a 'python' command, and
evaluate its body using the Python interpreter. */
static void
gdbpy_eval_from_control_command (const struct extension_language_defn *extlang,
struct command_line *cmd)
{
int ret;
if (cmd->body_list_1 != nullptr)
error (_("Invalid \"python\" block structure."));
gdbpy_enter enter_py (get_current_arch (), current_language);
std::string script = compute_python_string (cmd->body_list_0.get ());
ret = PyRun_SimpleString (script.c_str ());
if (ret)
error (_("Error while executing Python code."));
}
/* Implementation of the gdb "python" command. */
static void
python_command (const char *arg, int from_tty)
{
gdbpy_enter enter_py (get_current_arch (), current_language);
scoped_restore save_async = make_scoped_restore (¤t_ui->async, 0);
arg = skip_spaces (arg);
if (arg && *arg)
{
if (PyRun_SimpleString (arg))
error (_("Error while executing Python code."));
}
else
{
counted_command_line l = get_command_line (python_control, "");
execute_control_command_untraced (l.get ());
}
}
/* 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. */
PyObject *
gdbpy_parameter_value (enum var_types type, void *var)
{
switch (type)
{
case var_string:
case var_string_noescape:
case var_optional_filename:
case var_filename:
case var_enum:
{
const char *str = *(char **) var;
if (! str)
str = "";
return host_string_to_python_string (str).release ();
}
case var_boolean:
{
if (* (int *) var)
Py_RETURN_TRUE;
else
Py_RETURN_FALSE;
}
case var_auto_boolean:
{
enum auto_boolean ab = * (enum auto_boolean *) 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 *) var) == INT_MAX)
Py_RETURN_NONE;
/* Fall through. */
case var_zinteger:
case var_zuinteger_unlimited:
return PyLong_FromLong (* (int *) var);
case var_uinteger:
{
unsigned int val = * (unsigned int *) var;
if (val == UINT_MAX)
Py_RETURN_NONE;
return PyLong_FromUnsignedLong (val);
}
case var_zuinteger:
{
unsigned int val = * (unsigned int *) var;
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;
const char *arg;
int found = -1;
if (! PyArg_ParseTuple (args, "s", &arg))
return NULL;
std::string newarg = std::string ("show ") + arg;
try
{
found = lookup_cmd_composition (newarg.c_str (), &alias, &prefix, &cmd);
}
catch (const gdb_exception &ex)
{
GDB_PY_HANDLE_EXCEPTION (ex);
}
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 gdbpy_parameter_value (cmd->var_type, cmd->var);
}
/* Wrapper for target_charset. */
static PyObject *
gdbpy_target_charset (PyObject *self, PyObject *args)
{
const char *cset = target_charset (python_gdbarch);
return PyUnicode_Decode (cset, strlen (cset), host_charset (), NULL);
}
/* Wrapper for target_wide_charset. */
static PyObject *
gdbpy_target_wide_charset (PyObject *self, PyObject *args)
{
const char *cset = target_wide_charset (python_gdbarch);
return PyUnicode_Decode (cset, strlen (cset), host_charset (), NULL);
}
/* A Python function which evaluates a string using the gdb CLI. */
static PyObject *
execute_gdb_command (PyObject *self, PyObject *args, PyObject *kw)
{
const char *arg;
PyObject *from_tty_obj = NULL, *to_string_obj = NULL;
int from_tty, to_string;
static const char *keywords[] = { "command", "from_tty", "to_string", NULL };
if (!gdb_PyArg_ParseTupleAndKeywords (args, kw, "s|O!O!", keywords, &arg,
&PyBool_Type, &from_tty_obj,
&PyBool_Type, &to_string_obj))
return NULL;
from_tty = 0;
if (from_tty_obj)
{
int cmp = PyObject_IsTrue (from_tty_obj);
if (cmp < 0)
return NULL;
from_tty = cmp;
}
to_string = 0;
if (to_string_obj)
{
int cmp = PyObject_IsTrue (to_string_obj);
if (cmp < 0)
return NULL;
to_string = cmp;
}
std::string to_string_res;
scoped_restore preventer = prevent_dont_repeat ();
try
{
gdbpy_allow_threads allow_threads;
struct interp *interp;
std::string arg_copy = arg;
bool first = true;
char *save_ptr = nullptr;
auto reader
= [&] ()
{
const char *result = strtok_r (first ? &arg_copy[0] : nullptr,
"\n", &save_ptr);
first = false;
return result;
};
counted_command_line lines = read_command_lines_1 (reader, 1, nullptr);
{
scoped_restore save_async = make_scoped_restore (¤t_ui->async,
0);
scoped_restore save_uiout = make_scoped_restore (¤t_uiout);
/* Use the console interpreter uiout to have the same print format
for console or MI. */
interp = interp_lookup (current_ui, "console");
current_uiout = interp->interp_ui_out ();
if (to_string)
to_string_res = execute_control_commands_to_string (lines.get (),
from_tty);
else
execute_control_commands (lines.get (), from_tty);
}
/* Do any commands attached to breakpoint we stopped at. */
bpstat_do_actions ();
}
catch (const gdb_exception &except)
{
GDB_PY_HANDLE_EXCEPTION (except);
}
if (to_string)
return PyString_FromString (to_string_res.c_str ());
Py_RETURN_NONE;
}
/* Implementation of Python rbreak command. Take a REGEX and
optionally a MINSYMS, THROTTLE and SYMTABS keyword and return a
Python list that contains newly set breakpoints that match that
criteria. REGEX refers to a GDB format standard regex pattern of
symbols names to search; MINSYMS is an optional boolean (default
False) that indicates if the function should search GDB's minimal
symbols; THROTTLE is an optional integer (default unlimited) that
indicates the maximum amount of breakpoints allowable before the
function exits (note, if the throttle bound is passed, no
breakpoints will be set and a runtime error returned); SYMTABS is
an optional Python iterable that contains a set of gdb.Symtabs to
constrain the search within. */
static PyObject *
gdbpy_rbreak (PyObject *self, PyObject *args, PyObject *kw)
{
/* A simple type to ensure clean up of a vector of allocated strings
when a C interface demands a const char *array[] type
interface. */
struct symtab_list_type
{
~symtab_list_type ()
{
for (const char *elem: vec)
xfree ((void *) elem);
}
std::vector<const char *> vec;
};
char *regex = NULL;
std::vector<symbol_search> symbols;
unsigned long count = 0;
PyObject *symtab_list = NULL;
PyObject *minsyms_p_obj = NULL;
int minsyms_p = 0;
unsigned int throttle = 0;
static const char *keywords[] = {"regex","minsyms", "throttle",
"symtabs", NULL};
symtab_list_type symtab_paths;
if (!gdb_PyArg_ParseTupleAndKeywords (args, kw, "s|O!IO", keywords,
®ex, &PyBool_Type,
&minsyms_p_obj, &throttle,
&symtab_list))
return NULL;
/* Parse minsyms keyword. */
if (minsyms_p_obj != NULL)
{
int cmp = PyObject_IsTrue (minsyms_p_obj);
if (cmp < 0)
return NULL;
minsyms_p = cmp;
}
/* The "symtabs" keyword is any Python iterable object that returns
a gdb.Symtab on each iteration. If specified, iterate through
the provided gdb.Symtabs and extract their full path. As
python_string_to_target_string returns a
gdb::unique_xmalloc_ptr<char> and a vector containing these types
cannot be coerced to a const char **p[] via the vector.data call,
release the value from the unique_xmalloc_ptr and place it in a
simple type symtab_list_type (which holds the vector and a
destructor that frees the contents of the allocated strings. */
if (symtab_list != NULL)
{
gdbpy_ref<> iter (PyObject_GetIter (symtab_list));
if (iter == NULL)
return NULL;
while (true)
{
gdbpy_ref<> next (PyIter_Next (iter.get ()));
if (next == NULL)
{
if (PyErr_Occurred ())
return NULL;
break;
}
gdbpy_ref<> obj_name (PyObject_GetAttrString (next.get (),
"filename"));
if (obj_name == NULL)
return NULL;
/* Is the object file still valid? */
if (obj_name == Py_None)
continue;
gdb::unique_xmalloc_ptr<char> filename =
python_string_to_target_string (obj_name.get ());
if (filename == NULL)
return NULL;
/* Make sure there is a definite place to store the value of
filename before it is released. */
symtab_paths.vec.push_back (nullptr);
symtab_paths.vec.back () = filename.release ();
}
}
if (symtab_list)
{
const char **files = symtab_paths.vec.data ();
symbols = search_symbols (regex, FUNCTIONS_DOMAIN, NULL,
symtab_paths.vec.size (), files);
}
else
symbols = search_symbols (regex, FUNCTIONS_DOMAIN, NULL, 0, NULL);
/* Count the number of symbols (both symbols and optionally minimal
symbols) so we can correctly check the throttle limit. */
for (const symbol_search &p : symbols)
{
/* Minimal symbols included? */
if (minsyms_p)
{
if (p.msymbol.minsym != NULL)
count++;
}
if (p.symbol != NULL)
count++;
}
/* Check throttle bounds and exit if in excess. */
if (throttle != 0 && count > throttle)
{
PyErr_SetString (PyExc_RuntimeError,
_("Number of breakpoints exceeds throttled maximum."));
return NULL;
}
gdbpy_ref<> return_list (PyList_New (0));
if (return_list == NULL)
return NULL;
/* Construct full path names for symbols and call the Python
breakpoint constructor on the resulting names. Be tolerant of
individual breakpoint failures. */
for (const symbol_search &p : symbols)
{
std::string symbol_name;
/* Skipping minimal symbols? */
if (minsyms_p == 0)
if (p.msymbol.minsym != NULL)
continue;
if (p.msymbol.minsym == NULL)
{
struct symtab *symtab = symbol_symtab (p.symbol);
const char *fullname = symtab_to_fullname (symtab);
symbol_name = fullname;
symbol_name += ":";
symbol_name += SYMBOL_LINKAGE_NAME (p.symbol);
}
else
symbol_name = MSYMBOL_LINKAGE_NAME (p.msymbol.minsym);
gdbpy_ref<> argList (Py_BuildValue("(s)", symbol_name.c_str ()));
gdbpy_ref<> obj (PyObject_CallObject ((PyObject *)
&breakpoint_object_type,
argList.get ()));
/* Tolerate individual breakpoint failures. */
if (obj == NULL)
gdbpy_print_stack ();
else
{
if (PyList_Append (return_list.get (), obj.get ()) == -1)
return NULL;
}
}
return return_list.release ();
}
/* A Python function which is a wrapper for decode_line_1. */
static PyObject *
gdbpy_decode_line (PyObject *self, PyObject *args)
{
const char *arg = NULL;
gdbpy_ref<> result;
gdbpy_ref<> unparsed;
event_location_up location;
if (! PyArg_ParseTuple (args, "|s", &arg))
return NULL;
if (arg != NULL)
location = string_to_event_location_basic (&arg, python_language,
symbol_name_match_type::WILD);
std::vector<symtab_and_line> decoded_sals;
symtab_and_line def_sal;
gdb::array_view<symtab_and_line> sals;
try
{
if (location != NULL)
{
decoded_sals = decode_line_1 (location.get (), 0, NULL, NULL, 0);
sals = decoded_sals;
}
else
{
set_default_source_symtab_and_line ();
def_sal = get_current_source_symtab_and_line ();
sals = def_sal;
}
}
catch (const gdb_exception &ex)
{
/* We know this will always throw. */
gdbpy_convert_exception (ex);
return NULL;
}
if (!sals.empty ())
{
result.reset (PyTuple_New (sals.size ()));
if (result == NULL)
return NULL;
for (size_t i = 0; i < sals.size (); ++i)
{
PyObject *obj = symtab_and_line_to_sal_object (sals[i]);
if (obj == NULL)
return NULL;
PyTuple_SetItem (result.get (), i, obj);
}
}
else
result = gdbpy_ref<>::new_reference (Py_None);
gdbpy_ref<> return_result (PyTuple_New (2));
if (return_result == NULL)
return NULL;
if (arg != NULL && strlen (arg) > 0)
{
unparsed.reset (PyString_FromString (arg));
if (unparsed == NULL)
return NULL;
}
else
unparsed = gdbpy_ref<>::new_reference (Py_None);
PyTuple_SetItem (return_result.get (), 0, unparsed.release ());
PyTuple_SetItem (return_result.get (), 1, result.release ());
return return_result.release ();
}
/* Parse a string and evaluate it as an expression. */
static PyObject *
gdbpy_parse_and_eval (PyObject *self, PyObject *args)
{
const char *expr_str;
struct value *result = NULL;
if (!PyArg_ParseTuple (args, "s", &expr_str))
return NULL;
try
{
gdbpy_allow_threads allow_threads;
result = parse_and_eval (expr_str);
}
catch (const gdb_exception &except)
{
GDB_PY_HANDLE_EXCEPTION (except);
}
return value_to_value_object (result);
}
/* Implementation of gdb.invalidate_cached_frames. */
static PyObject *
gdbpy_invalidate_cached_frames (PyObject *self, PyObject *args)
{
reinit_frame_cache ();
Py_RETURN_NONE;
}
/* Read a file as Python code.
This is the extension_language_script_ops.script_sourcer "method".
FILE is the file to load. FILENAME is name of the file FILE.
This does not throw any errors. If an exception occurs python will print
the traceback and clear the error indicator. */
static void
gdbpy_source_script (const struct extension_language_defn *extlang,
FILE *file, const char *filename)
{
gdbpy_enter enter_py (get_current_arch (), current_language);
python_run_simple_file (file, filename);
}
/* Posting and handling events. */
/* A single event. */
struct gdbpy_event
{
/* The Python event. This is just a callable object. */
PyObject *event;
/* The next event. */
struct gdbpy_event *next;
};
/* All pending events. */
static struct gdbpy_event *gdbpy_event_list;
/* The final link of the event list. */
static struct gdbpy_event **gdbpy_event_list_end;
/* So that we can wake up the main thread even when it is blocked in
poll(). */
static struct serial_event *gdbpy_serial_event;
/* The file handler callback. This reads from the internal pipe, and
then processes the Python event queue. This will always be run in
the main gdb thread. */
static void
gdbpy_run_events (int error, gdb_client_data client_data)
{
gdbpy_enter enter_py (get_current_arch (), current_language);
/* Clear the event fd. Do this before flushing the events list, so
that any new event post afterwards is sure to re-awake the event
loop. */
serial_event_clear (gdbpy_serial_event);
while (gdbpy_event_list)
{
/* Dispatching the event might push a new element onto the event
loop, so we update here "atomically enough". */
struct gdbpy_event *item = gdbpy_event_list;
gdbpy_event_list = gdbpy_event_list->next;
if (gdbpy_event_list == NULL)
gdbpy_event_list_end = &gdbpy_event_list;
gdbpy_ref<> call_result (PyObject_CallObject (item->event, NULL));
if (call_result == NULL)
gdbpy_print_stack ();
Py_DECREF (item->event);
xfree (item);
}
}
/* Submit an event to the gdb thread. */
static PyObject *
gdbpy_post_event (PyObject *self, PyObject *args)
{
struct gdbpy_event *event;
PyObject *func;
int wakeup;
if (!PyArg_ParseTuple (args, "O", &func))
return NULL;
if (!PyCallable_Check (func))
{