darkkirb/old-cross-binutils
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity
old-cross-binutils/gdb/python/py-cmd.c
Pedro Alves 492d29ea1c Split TRY_CATCH into TRY + CATCH 
This patch splits the TRY_CATCH macro into three, so that we go from
this:

~~~
  volatile gdb_exception ex;

  TRY_CATCH (ex, RETURN_MASK_ERROR)
    {
    }
  if (ex.reason < 0)
    {
    }
~~~

to this:

~~~
  TRY
    {
    }
  CATCH (ex, RETURN_MASK_ERROR)
    {
    }
  END_CATCH
~~~

Thus, we'll be getting rid of the local volatile exception object, and
declaring the caught exception in the catch block.

This allows reimplementing TRY/CATCH in terms of C++ exceptions when
building in C++ mode, while still allowing to build GDB in C mode
(using setjmp/longjmp), as a transition step.

TBC, after this patch, is it _not_ valid to have code between the TRY
and the CATCH blocks, like:

  TRY
    {
    }

  // some code here.

  CATCH (ex, RETURN_MASK_ERROR)
    {
    }
  END_CATCH

Just like it isn't valid to do that with C++'s native try/catch.

By switching to creating the exception object inside the CATCH block
scope, we can get rid of all the explicitly allocated volatile
exception objects all over the tree, and map the CATCH block more
directly to C++'s catch blocks.

The majority of the TRY_CATCH -> TRY+CATCH+END_CATCH conversion was
done with a script, rerun from scratch at every rebase, no manual
editing involved.  After the mechanical conversion, a few places
needed manual intervention, to fix preexisting cases where we were
using the exception object outside of the TRY_CATCH block, and cases
where we were using "else" after a 'if (ex.reason) < 0)' [a CATCH
after this patch].  The result was folded into this patch so that GDB
still builds at each incremental step.

END_CATCH is necessary for two reasons:

First, because we name the exception object in the CATCH block, which
requires creating a scope, which in turn must be closed somewhere.
Declaring the exception variable in the initializer field of a for
block, like:

  #define CATCH(EXCEPTION, mask) \
    for (struct gdb_exception EXCEPTION; \
         exceptions_state_mc_catch (&EXCEPTION, MASK); \
	 EXCEPTION = exception_none)

would avoid needing END_CATCH, but alas, in C mode, we build with C90,
which doesn't allow mixed declarations and code.

Second, because when TRY/CATCH are wired to real C++ try/catch, as
long as we need to handle cleanup chains, even if there's no CATCH
block that wants to catch the exception, we need for stop at every
frame in the unwind chain and run cleanups, then rethrow.  That will
be done in END_CATCH.

After we require C++, we'll still need TRY/CATCH/END_CATCH until
cleanups are completely phased out -- TRY/CATCH in C++ mode will
save/restore the current cleanup chain, like in C mode, and END_CATCH
catches otherwise uncaugh exceptions, runs cleanups and rethrows, so
that C++ cleanups and exceptions can coexist.

IMO, this still makes the TRY/CATCH code look a bit more like a
newcomer would expect, so IMO worth it even if we weren't considering
C++.

gdb/ChangeLog.
2015-03-07  Pedro Alves  <palves@redhat.com>

	* common/common-exceptions.c (struct catcher) <exception>: No
	longer a pointer to volatile exception.  Now an exception value.
	<mask>: Delete field.
	(exceptions_state_mc_init): Remove all parameters.  Adjust.
	(exceptions_state_mc): No longer pop the catcher here.
	(exceptions_state_mc_catch): New function.
	(throw_exception): Adjust.
	* common/common-exceptions.h (exceptions_state_mc_init): Remove
	all parameters.
	(exceptions_state_mc_catch): Declare.
	(TRY_CATCH): Rename to ...
	(TRY): ... this.  Remove EXCEPTION and MASK parameters.
	(CATCH, END_CATCH): New.
	All callers adjusted.

gdb/gdbserver/ChangeLog:
2015-03-07  Pedro Alves  <palves@redhat.com>

	Adjust all callers of TRY_CATCH to use TRY/CATCH/END_CATCH
	instead.
2015-03-07 15:14:14 +00:00

841 lines
23 KiB
C
Raw Blame History

This file contains invisible Unicode characters

This file contains invisible Unicode characters that are indistinguishable to humans but may be processed differently by a computer. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

/* gdb commands implemented in Python
Copyright (C) 2008-2015 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 "value.h"
#include "python-internal.h"
#include "charset.h"
#include "gdbcmd.h"
#include "cli/cli-decode.h"
#include "completer.h"
#include "language.h"
/* Struct representing built-in completion types. */
struct cmdpy_completer
{
/* Python symbol name.
This isn't a const char * for Python 2.4's sake.
PyModule_AddIntConstant only takes a char *, sigh. */
char *name;
/* Completion function. */
completer_ftype *completer;
};
static const struct cmdpy_completer completers[] =
{
{ "COMPLETE_NONE", noop_completer },
{ "COMPLETE_FILENAME", filename_completer },
{ "COMPLETE_LOCATION", location_completer },
{ "COMPLETE_COMMAND", command_completer },
{ "COMPLETE_SYMBOL", make_symbol_completion_list_fn },
{ "COMPLETE_EXPRESSION", expression_completer },
};
#define N_COMPLETERS (sizeof (completers) / sizeof (completers[0]))
/* A gdb command. For the time being only ordinary commands (not
set/show commands) are allowed. */
struct cmdpy_object
{
PyObject_HEAD
/* The corresponding gdb command object, or NULL if the command is
no longer installed. */
struct cmd_list_element *command;
/* A prefix command requires storage for a list of its sub-commands.
A pointer to this is passed to add_prefix_command, and to add_cmd
for sub-commands of that prefix. If this Command is not a prefix
command, then this field is unused. */
struct cmd_list_element *sub_list;
};
typedef struct cmdpy_object cmdpy_object;
extern PyTypeObject cmdpy_object_type
CPYCHECKER_TYPE_OBJECT_FOR_TYPEDEF ("cmdpy_object");
/* Constants used by this module. */
static PyObject *invoke_cst;
static PyObject *complete_cst;
/* Python function which wraps dont_repeat. */
static PyObject *
cmdpy_dont_repeat (PyObject *self, PyObject *args)
{
dont_repeat ();
Py_RETURN_NONE;
}
/* Called if the gdb cmd_list_element is destroyed. */
static void
cmdpy_destroyer (struct cmd_list_element *self, void *context)
{
cmdpy_object *cmd;
struct cleanup *cleanup;
cleanup = ensure_python_env (get_current_arch (), current_language);
/* Release our hold on the command object. */
cmd = (cmdpy_object *) context;
cmd->command = NULL;
Py_DECREF (cmd);
/* We allocated the name, doc string, and perhaps the prefix
name. */
xfree ((char *) self->name);
xfree ((char *) self->doc);
xfree ((char *) self->prefixname);
do_cleanups (cleanup);
}
/* Called by gdb to invoke the command. */
static void
cmdpy_function (struct cmd_list_element *command, char *args, int from_tty)
{
cmdpy_object *obj = (cmdpy_object *) get_cmd_context (command);
PyObject *argobj, *ttyobj, *result;
struct cleanup *cleanup;
cleanup = ensure_python_env (get_current_arch (), current_language);
if (! obj)
error (_("Invalid invocation of Python command object."));
if (! PyObject_HasAttr ((PyObject *) obj, invoke_cst))
{
if (obj->command->prefixname)
{
/* A prefix command does not need an invoke method. */
do_cleanups (cleanup);
return;
}
error (_("Python command object missing 'invoke' method."));
}
if (! args)
args = "";
argobj = PyUnicode_Decode (args, strlen (args), host_charset (), NULL);
if (! argobj)
{
gdbpy_print_stack ();
error (_("Could not convert arguments to Python string."));
}
ttyobj = from_tty ? Py_True : Py_False;
Py_INCREF (ttyobj);
result = PyObject_CallMethodObjArgs ((PyObject *) obj, invoke_cst, argobj,
ttyobj, NULL);
Py_DECREF (argobj);
Py_DECREF (ttyobj);
if (! result)
{
PyObject *ptype, *pvalue, *ptraceback;
char *msg;
PyErr_Fetch (&ptype, &pvalue, &ptraceback);
/* Try to fetch an error message contained within ptype, pvalue.
When fetching the error message we need to make our own copy,
we no longer own ptype, pvalue after the call to PyErr_Restore. */
msg = gdbpy_exception_to_string (ptype, pvalue);
make_cleanup (xfree, msg);
if (msg == NULL)
{
/* An error occurred computing the string representation of the
error message. This is rare, but we should inform the user. */
printf_filtered (_("An error occurred in a Python command\n"
"and then another occurred computing the "
"error message.\n"));
gdbpy_print_stack ();
}
/* Don't print the stack for gdb.GdbError exceptions.
It is generally used to flag user errors.
We also don't want to print "Error occurred in Python command"
for user errors. However, a missing message for gdb.GdbError
exceptions is arguably a bug, so we flag it as such. */
if (! PyErr_GivenExceptionMatches (ptype, gdbpy_gdberror_exc)
|| msg == NULL || *msg == '\0')
{
PyErr_Restore (ptype, pvalue, ptraceback);
gdbpy_print_stack ();
if (msg != NULL && *msg != '\0')
error (_("Error occurred in Python command: %s"), msg);
else
error (_("Error occurred in Python command."));
}
else
{
Py_XDECREF (ptype);
Py_XDECREF (pvalue);
Py_XDECREF (ptraceback);
error ("%s", msg);
}
}
Py_DECREF (result);
do_cleanups (cleanup);
}
/* Helper function for the Python command completers (both "pure"
completer and brkchar handler). This function takes COMMAND, TEXT
and WORD and tries to call the Python method for completion with
these arguments. It also takes HANDLE_BRKCHARS_P, an argument to
identify whether it is being called from the brkchar handler or
from the "pure" completer. In the first case, it effectively calls
the Python method for completion, and records the PyObject in a
static variable (used as a "cache"). In the second case, it just
returns that variable, without actually calling the Python method
again. This saves us one Python method call.
The reason for this two step dance is that we need to know the set
of "brkchars" to use early on, before we actually try to perform
the completion. But if a Python command supplies a "complete"
method then we have to call that method first: it may return as its
result the kind of completion to perform and that will in turn
specify which brkchars to use. IOW, we need the result of the
"complete" method before we actually perform the completion.
It is important to mention that this function is built on the
assumption that the calls to cmdpy_completer_handle_brkchars and
cmdpy_completer will be subsequent with nothing intervening. This
is true for our completer mechanism.
This function returns the PyObject representing the Python method
call. */
static PyObject *
cmdpy_completer_helper (struct cmd_list_element *command,
const char *text, const char *word,
int handle_brkchars_p)
{
cmdpy_object *obj = (cmdpy_object *) get_cmd_context (command);
PyObject *textobj, *wordobj;
/* This static variable will server as a "cache" for us, in order to
store the PyObject that results from calling the Python
function. */
static PyObject *resultobj = NULL;
if (handle_brkchars_p)
{
/* If we were called to handle brkchars, it means this is the
first function call of two that will happen in a row.
Therefore, we need to call the completer ourselves, and cache
the return value in the static variable RESULTOBJ. Then, in
the second call, we can just use the value of RESULTOBJ to do
our job. */
if (resultobj != NULL)
Py_DECREF (resultobj);
resultobj = NULL;
if (obj == NULL)
error (_("Invalid invocation of Python command object."));
if (!PyObject_HasAttr ((PyObject *) obj, complete_cst))
{
/* If there is no complete method, don't error. */
return NULL;
}
textobj = PyUnicode_Decode (text, strlen (text), host_charset (), NULL);
if (textobj == NULL)
error (_("Could not convert argument to Python string."));
wordobj = PyUnicode_Decode (word, sizeof (word), host_charset (), NULL);
if (wordobj == NULL)
{
Py_DECREF (textobj);
error (_("Could not convert argument to Python string."));
}
resultobj = PyObject_CallMethodObjArgs ((PyObject *) obj, complete_cst,
textobj, wordobj, NULL);
Py_DECREF (textobj);
Py_DECREF (wordobj);
if (!resultobj)
{
/* Just swallow errors here. */
PyErr_Clear ();
}
Py_XINCREF (resultobj);
}
return resultobj;
}
/* Python function called to determine the break characters of a
certain completer. We are only interested in knowing if the
completer registered by the user will return one of the integer
codes (see COMPLETER_* symbols). */
static void
cmdpy_completer_handle_brkchars (struct cmd_list_element *command,
const char *text, const char *word)
{
PyObject *resultobj = NULL;
struct cleanup *cleanup;
cleanup = ensure_python_env (get_current_arch (), current_language);
/* Calling our helper to obtain the PyObject of the Python
function. */
resultobj = cmdpy_completer_helper (command, text, word, 1);
/* Check if there was an error. */
if (resultobj == NULL)
goto done;
if (PyInt_Check (resultobj))
{
/* User code may also return one of the completion constants,
thus requesting that sort of completion. We are only
interested in this kind of return. */
long value;
if (!gdb_py_int_as_long (resultobj, &value))
{
/* Ignore. */
PyErr_Clear ();
}
else if (value >= 0 && value < (long) N_COMPLETERS)
{
/* This is the core of this function. Depending on which
completer type the Python function returns, we have to
adjust the break characters accordingly. */
set_gdb_completion_word_break_characters
(completers[value].completer);
}
}
done:
/* We do not call Py_XDECREF here because RESULTOBJ will be used in
the subsequent call to cmdpy_completer function. */
do_cleanups (cleanup);
}
/* Called by gdb for command completion. */
static VEC (char_ptr) *
cmdpy_completer (struct cmd_list_element *command,
const char *text, const char *word)
{
PyObject *resultobj = NULL;
VEC (char_ptr) *result = NULL;
struct cleanup *cleanup;
cleanup = ensure_python_env (get_current_arch (), current_language);
/* Calling our helper to obtain the PyObject of the Python
function. */
resultobj = cmdpy_completer_helper (command, text, word, 0);
/* If the result object of calling the Python function is NULL, it
means that there was an error. In this case, just give up and
return NULL. */
if (resultobj == NULL)
goto done;
result = NULL;
if (PyInt_Check (resultobj))
{
/* User code may also return one of the completion constants,
thus requesting that sort of completion. */
long value;
if (! gdb_py_int_as_long (resultobj, &value))
{
/* Ignore. */
PyErr_Clear ();
}
else if (value >= 0 && value < (long) N_COMPLETERS)
result = completers[value].completer (command, text, word);
}
else
{
PyObject *iter = PyObject_GetIter (resultobj);
PyObject *elt;
if (iter == NULL)
goto done;
while ((elt = PyIter_Next (iter)) != NULL)
{
char *item;
if (! gdbpy_is_string (elt))
{
/* Skip problem elements. */
Py_DECREF (elt);
continue;
}
item = python_string_to_host_string (elt);
Py_DECREF (elt);
if (item == NULL)
{
/* Skip problem elements. */
PyErr_Clear ();
continue;
}
VEC_safe_push (char_ptr, result, item);
}
Py_DECREF (iter);
/* If we got some results, ignore problems. Otherwise, report
the problem. */
if (result != NULL && PyErr_Occurred ())
PyErr_Clear ();
}
done:
do_cleanups (cleanup);
return result;
}
/* Helper for cmdpy_init which locates the command list to use and
pulls out the command name.
NAME is the command name list. The final word in the list is the
name of the new command. All earlier words must be existing prefix
commands.
*BASE_LIST is set to the final prefix command's list of
*sub-commands.
START_LIST is the list in which the search starts.
This function returns the xmalloc()d name of the new command. On
error sets the Python error and returns NULL. */
char *
gdbpy_parse_command_name (const char *name,
struct cmd_list_element ***base_list,
struct cmd_list_element **start_list)
{
struct cmd_list_element *elt;
int len = strlen (name);
int i, lastchar;
char *prefix_text;
const char *prefix_text2;
char *result;
/* Skip trailing whitespace. */
for (i = len - 1; i >= 0 && (name[i] == ' ' || name[i] == '\t'); --i)
;
if (i < 0)
{
PyErr_SetString (PyExc_RuntimeError, _("No command name found."));
return NULL;
}
lastchar = i;
/* Find first character of the final word. */
for (; i > 0 && (isalnum (name[i - 1])
|| name[i - 1] == '-'
|| name[i - 1] == '_');
--i)
;
result = xmalloc (lastchar - i + 2);
memcpy (result, &name[i], lastchar - i + 1);
result[lastchar - i + 1] = '\0';
/* Skip whitespace again. */
for (--i; i >= 0 && (name[i] == ' ' || name[i] == '\t'); --i)
;
if (i < 0)
{
*base_list = start_list;
return result;
}
prefix_text = xmalloc (i + 2);
memcpy (prefix_text, name, i + 1);
prefix_text[i + 1] = '\0';
prefix_text2 = prefix_text;
elt = lookup_cmd_1 (&prefix_text2, *start_list, NULL, 1);
if (elt == NULL || elt == CMD_LIST_AMBIGUOUS)
{
PyErr_Format (PyExc_RuntimeError, _("Could not find command prefix %s."),
prefix_text);
xfree (prefix_text);
xfree (result);
return NULL;
}
if (elt->prefixlist)
{
xfree (prefix_text);
*base_list = elt->prefixlist;
return result;
}
PyErr_Format (PyExc_RuntimeError, _("'%s' is not a prefix command."),
prefix_text);
xfree (prefix_text);
xfree (result);
return NULL;
}
/* Object initializer; sets up gdb-side structures for command.
Use: __init__(NAME, COMMAND_CLASS [, COMPLETER_CLASS][, PREFIX]]).
NAME is the name of the command. It may consist of multiple words,
in which case the final word is the name of the new command, and
earlier words must be prefix commands.
COMMAND_CLASS is the kind of command. It should be one of the COMMAND_*
constants defined in the gdb module.
COMPLETER_CLASS is the kind of completer. If not given, the
"complete" method will be used. Otherwise, it should be one of the
COMPLETE_* constants defined in the gdb module.
If PREFIX is True, then this command is a prefix command.
The documentation for the command is taken from the doc string for
the python class. */
static int
cmdpy_init (PyObject *self, PyObject *args, PyObject *kw)
{
cmdpy_object *obj = (cmdpy_object *) self;
const char *name;
int cmdtype;
int completetype = -1;
char *docstring = NULL;
struct cmd_list_element **cmd_list;
char *cmd_name, *pfx_name;
static char *keywords[] = { "name", "command_class", "completer_class",
"prefix", NULL };
PyObject *is_prefix = NULL;
int cmp;
if (obj->command)
{
/* Note: this is apparently not documented in Python. We return
0 for success, -1 for failure. */
PyErr_Format (PyExc_RuntimeError,
_("Command object already initialized."));
return -1;
}
if (! PyArg_ParseTupleAndKeywords (args, kw, "si|iO",
keywords, &name, &cmdtype,
&completetype, &is_prefix))
return -1;
if (cmdtype != no_class && cmdtype != class_run
&& cmdtype != class_vars && cmdtype != class_stack
&& cmdtype != class_files && cmdtype != class_support
&& cmdtype != class_info && cmdtype != class_breakpoint
&& cmdtype != class_trace && cmdtype != class_obscure
&& cmdtype != class_maintenance && cmdtype != class_user)
{
PyErr_Format (PyExc_RuntimeError, _("Invalid command class argument."));
return -1;
}
if (completetype < -1 || completetype >= (int) N_COMPLETERS)
{
PyErr_Format (PyExc_RuntimeError,
_("Invalid completion type argument."));
return -1;
}
cmd_name = gdbpy_parse_command_name (name, &cmd_list, &cmdlist);
if (! cmd_name)
return -1;
pfx_name = NULL;
if (is_prefix != NULL)
{
cmp = PyObject_IsTrue (is_prefix);
if (cmp == 1)
{
int i, out;
/* Make a normalized form of the command name. */
pfx_name = xmalloc (strlen (name) + 2);
i = 0;
out = 0;
while (name[i])
{
/* Skip whitespace. */
while (name[i] == ' ' || name[i] == '\t')
++i;
/* Copy non-whitespace characters. */
while (name[i] && name[i] != ' ' && name[i] != '\t')
pfx_name[out++] = name[i++];
/* Add a single space after each word -- including the final
word. */
pfx_name[out++] = ' ';
}
pfx_name[out] = '\0';
}
else if (cmp < 0)
{
xfree (cmd_name);
return -1;
}
}
if (PyObject_HasAttr (self, gdbpy_doc_cst))
{
PyObject *ds_obj = PyObject_GetAttr (self, gdbpy_doc_cst);
if (ds_obj && gdbpy_is_string (ds_obj))
{
docstring = python_string_to_host_string (ds_obj);
if (docstring == NULL)
{
xfree (cmd_name);
xfree (pfx_name);
Py_DECREF (ds_obj);
return -1;
}
}
Py_XDECREF (ds_obj);
}
if (! docstring)
docstring = xstrdup (_("This command is not documented."));
Py_INCREF (self);
TRY
{
struct cmd_list_element *cmd;
if (pfx_name)
{
int allow_unknown;
/* If we have our own "invoke" method, then allow unknown
sub-commands. */
allow_unknown = PyObject_HasAttr (self, invoke_cst);
cmd = add_prefix_cmd (cmd_name, (enum command_class) cmdtype,
NULL, docstring, &obj->sub_list,
pfx_name, allow_unknown, cmd_list);
}
else
cmd = add_cmd (cmd_name, (enum command_class) cmdtype, NULL,
docstring, cmd_list);
/* There appears to be no API to set this. */
cmd->func = cmdpy_function;
cmd->destroyer = cmdpy_destroyer;
obj->command = cmd;
set_cmd_context (cmd, self);
set_cmd_completer (cmd, ((completetype == -1) ? cmdpy_completer
: completers[completetype].completer));
if (completetype == -1)
set_cmd_completer_handle_brkchars (cmd,
cmdpy_completer_handle_brkchars);
}
CATCH (except, RETURN_MASK_ALL)
{
xfree (cmd_name);
xfree (docstring);
xfree (pfx_name);
Py_DECREF (self);
PyErr_Format (except.reason == RETURN_QUIT
? PyExc_KeyboardInterrupt : PyExc_RuntimeError,
"%s", except.message);
return -1;
}
END_CATCH
return 0;
}
/* Initialize the 'commands' code. */
int
gdbpy_initialize_commands (void)
{
int i;
cmdpy_object_type.tp_new = PyType_GenericNew;
if (PyType_Ready (&cmdpy_object_type) < 0)
return -1;
/* Note: alias and user are special; pseudo appears to be unused,
and there is no reason to expose tui or xdb, I think. */
if (PyModule_AddIntConstant (gdb_module, "COMMAND_NONE", no_class) < 0
|| PyModule_AddIntConstant (gdb_module, "COMMAND_RUNNING", class_run) < 0
|| PyModule_AddIntConstant (gdb_module, "COMMAND_DATA", class_vars) < 0
|| PyModule_AddIntConstant (gdb_module, "COMMAND_STACK", class_stack) < 0
|| PyModule_AddIntConstant (gdb_module, "COMMAND_FILES", class_files) < 0
|| PyModule_AddIntConstant (gdb_module, "COMMAND_SUPPORT",
class_support) < 0
|| PyModule_AddIntConstant (gdb_module, "COMMAND_STATUS", class_info) < 0
|| PyModule_AddIntConstant (gdb_module, "COMMAND_BREAKPOINTS",
class_breakpoint) < 0
|| PyModule_AddIntConstant (gdb_module, "COMMAND_TRACEPOINTS",
class_trace) < 0
|| PyModule_AddIntConstant (gdb_module, "COMMAND_OBSCURE",
class_obscure) < 0
|| PyModule_AddIntConstant (gdb_module, "COMMAND_MAINTENANCE",
class_maintenance) < 0
|| PyModule_AddIntConstant (gdb_module, "COMMAND_USER", class_user) < 0)
return -1;
for (i = 0; i < N_COMPLETERS; ++i)
{
if (PyModule_AddIntConstant (gdb_module, completers[i].name, i) < 0)
return -1;
}
if (gdb_pymodule_addobject (gdb_module, "Command",
(PyObject *) &cmdpy_object_type) < 0)
return -1;
invoke_cst = PyString_FromString ("invoke");
if (invoke_cst == NULL)
return -1;
complete_cst = PyString_FromString ("complete");
if (complete_cst == NULL)
return -1;
return 0;
}
static PyMethodDef cmdpy_object_methods[] =
{
{ "dont_repeat", cmdpy_dont_repeat, METH_NOARGS,
"Prevent command repetition when user enters empty line." },
{ 0 }
};
PyTypeObject cmdpy_object_type =
{
PyVarObject_HEAD_INIT (NULL, 0)
"gdb.Command", /*tp_name*/
sizeof (cmdpy_object), /*tp_basicsize*/
0, /*tp_itemsize*/
0, /*tp_dealloc*/
0, /*tp_print*/
0, /*tp_getattr*/
0, /*tp_setattr*/
0, /*tp_compare*/
0, /*tp_repr*/
0, /*tp_as_number*/
0, /*tp_as_sequence*/
0, /*tp_as_mapping*/
0, /*tp_hash */
0, /*tp_call*/
0, /*tp_str*/
0, /*tp_getattro*/
0, /*tp_setattro*/
0, /*tp_as_buffer*/
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /*tp_flags*/
"GDB command object", /* tp_doc */
0, /* tp_traverse */
0, /* tp_clear */
0, /* tp_richcompare */
0, /* tp_weaklistoffset */
0, /* tp_iter */
0, /* tp_iternext */
cmdpy_object_methods, /* tp_methods */
0, /* tp_members */
0, /* tp_getset */
0, /* tp_base */
0, /* tp_dict */
0, /* tp_descr_get */
0, /* tp_descr_set */
0, /* tp_dictoffset */
cmdpy_init, /* tp_init */
0, /* tp_alloc */
};
/* Utility to build a buildargv-like result from ARGS.
This intentionally parses arguments the way libiberty/argv.c:buildargv
does. It splits up arguments in a reasonable way, and we want a standard
way of parsing arguments. Several gdb commands use buildargv to parse their
arguments. Plus we want to be able to write compatible python
implementations of gdb commands. */
PyObject *
gdbpy_string_to_argv (PyObject *self, PyObject *args)
{
PyObject *py_argv;
const char *input;
if (!PyArg_ParseTuple (args, "s", &input))
return NULL;
py_argv = PyList_New (0);
if (py_argv == NULL)
return NULL;
/* buildargv uses NULL to represent an empty argument list, but we can't use
that in Python. Instead, if ARGS is "" then return an empty list.
This undoes the NULL -> "" conversion that cmdpy_function does. */
if (*input != '\0')
{
char **c_argv = gdb_buildargv (input);
int i;
for (i = 0; c_argv[i] != NULL; ++i)
{
PyObject *argp = PyString_FromString (c_argv[i]);
if (argp == NULL
|| PyList_Append (py_argv, argp) < 0)
{
Py_XDECREF (argp);
Py_DECREF (py_argv);
freeargv (c_argv);
return NULL;
}
Py_DECREF (argp);
}
freeargv (c_argv);
}
return py_argv;
}
Reference in a new issue View git blame Copy permalink