[v3,3/5] Create MI commands using python.
Commit Message
From: Didier Nadeau <didier.nadeau@gmail.com>
This commit allows an user to create custom MI commands using Python
similarly to what is possible for Python CLI commands.
A new subclass of mi_command is defined for Python MI commands,
mi_command_py. A new file, py-micmd.c contains the logic for Python
MI commands.
gdb/ChangeLog
* Makefile.in (SUBDIR_PYTHON_SRCS): Add py-micmd.c.
* mi/mi-cmds.c (insert_mi_cmd_entry): Remove static.
(mi_cmd_table): Remove static.
* mi/mi-cmds.h (insert_mi_cmd_entry): New declaration.
(mi_cmd_table): New declaration.
* python/py-micmd.c: New file
(parse_mi_result): New function.
(micmdpy_init): New function.
(gdbpy_initialize_micommands): New function.
(mi_command_py): New class.
* python/py-micmd.h: New file
(micmdpy_object): New struct.
(micmdpy_object): New typedef.
(mi_command_py): New class.
* python/python-internal.h
(gdbpy_initialize_micommands): New declaration.
* python/python.c
(_initialize_python): New call to gdbpy_initialize_micommands.
(finalize_python): Finalize Python MI commands.
---
gdb/ChangeLog | 23 +++
gdb/Makefile.in | 1 +
gdb/mi/mi-cmds.c | 7 +-
gdb/mi/mi-cmds.h | 9 ++
gdb/python/py-micmd.c | 297 +++++++++++++++++++++++++++++++++++
gdb/python/py-micmd.h | 60 +++++++
gdb/python/python-internal.h | 2 +
gdb/python/python.c | 13 +-
8 files changed, 407 insertions(+), 5 deletions(-)
create mode 100644 gdb/python/py-micmd.c
create mode 100644 gdb/python/py-micmd.h
Comments
On 5/30/19 2:48 PM, Jan Vrany wrote:
> From: Didier Nadeau <didier.nadeau@gmail.com>
>
> This commit allows an user to create custom MI commands using Python
> similarly to what is possible for Python CLI commands.
>
> A new subclass of mi_command is defined for Python MI commands,
> mi_command_py. A new file, py-micmd.c contains the logic for Python
> MI commands.
>
> gdb/ChangeLog
>
> * python/py-micmd.h: New file
> (micmdpy_object): New struct.
> (micmdpy_object): New typedef.
This typedef shouldn't be necessary?
> (mi_command_py): New class.
> * python/python-internal.h
> (gdbpy_initialize_micommands): New declaration.
> * python/python.c
> (_initialize_python): New call to gdbpy_initialize_micommands.
> (finalize_python): Finalize Python MI commands.
> ---
> gdb/ChangeLog | 23 +++
> gdb/Makefile.in | 1 +
> gdb/mi/mi-cmds.c | 7 +-
> gdb/mi/mi-cmds.h | 9 ++
> gdb/python/py-micmd.c | 297 +++++++++++++++++++++++++++++++++++
> gdb/python/py-micmd.h | 60 +++++++
> gdb/python/python-internal.h | 2 +
> gdb/python/python.c | 13 +-
> 8 files changed, 407 insertions(+), 5 deletions(-)
> create mode 100644 gdb/python/py-micmd.c
> create mode 100644 gdb/python/py-micmd.h
>
> diff --git a/gdb/ChangeLog b/gdb/ChangeLog
> index 994ad947bd..241e5da68f 100644
> --- a/gdb/ChangeLog
> +++ b/gdb/ChangeLog
> @@ -1,3 +1,26 @@
> +2019-05-02 Didier Nadeau <didier.nadeau@gmail.com>
> + Jan Vrany <jan.vrany@fit.cvut.cz>
> +
> + * Makefile.in (SUBDIR_PYTHON_SRCS): Add py-micmd.c.
> + * mi/mi-cmds.c (insert_mi_cmd_entry): Remove static.
> + (mi_cmd_table): Remove static.
> + * mi/mi-cmds.h (insert_mi_cmd_entry): New declaration.
> + (mi_cmd_table): New declaration.
> + * python/py-micmd.c: New file
> + (parse_mi_result): New function.
> + (micmdpy_init): New function.
> + (gdbpy_initialize_micommands): New function.
> + (mi_command_py): New class.
> + * python/py-micmd.h: New file
> + (micmdpy_object): New struct.
> + (micmdpy_object): New typedef.
> + (mi_command_py): New class.
> + * python/python-internal.h
> + (gdbpy_initialize_micommands): New declaration.
> + * python/python.c
> + (_initialize_python): New call to gdbpy_initialize_micommands.
> + (finalize_python): Finalize Python MI commands.
> +
> 2019-05-02 Didier Nadeau <didier.nadeau@gmail.com>
> Jan Vrany <jan.vrany@fit.cvut.cz>
>
> diff --git a/gdb/Makefile.in b/gdb/Makefile.in
> index 0f49578360..28866962bc 100644
> --- a/gdb/Makefile.in
> +++ b/gdb/Makefile.in
> @@ -382,6 +382,7 @@ SUBDIR_PYTHON_SRCS = \
> python/py-instruction.c \
> python/py-lazy-string.c \
> python/py-linetable.c \
> + python/py-micmd.c \
> python/py-newobjfileevent.c \
> python/py-objfile.c \
> python/py-param.c \
> diff --git a/gdb/mi/mi-cmds.c b/gdb/mi/mi-cmds.c
> index 2d8863c5f9..0aead954f9 100644
> --- a/gdb/mi/mi-cmds.c
> +++ b/gdb/mi/mi-cmds.c
> @@ -28,12 +28,11 @@
>
> /* MI command table (built at run time). */
>
> -static std::map<std::string, mi_cmd_up> mi_cmd_table;
> +std::map<std::string, mi_cmd_up> mi_cmd_table;
>
> -/* Insert a new mi-command into the command table. Return true if
> - insertion was successful. */
> +/* See mi-cmds.h. */
>
> -static bool
> +bool
> insert_mi_cmd_entry (mi_cmd_up command)
> {
> gdb_assert (command != NULL);
> diff --git a/gdb/mi/mi-cmds.h b/gdb/mi/mi-cmds.h
> index f1b4728bde..5ca7232fca 100644
> --- a/gdb/mi/mi-cmds.h
> +++ b/gdb/mi/mi-cmds.h
> @@ -22,6 +22,8 @@
> #ifndef MI_MI_CMDS_H
> #define MI_MI_CMDS_H
>
> +#include <map>
Include <string> as well.
> +
> enum print_values {
> PRINT_NO_VALUES,
> PRINT_ALL_VALUES,
> @@ -191,9 +193,16 @@ typedef std::unique_ptr<mi_command> mi_cmd_up;
>
> extern mi_command *mi_cmd_lookup (const char *command);
>
> +extern std::map<std::string, mi_cmd_up> mi_cmd_table;
> +
> /* Debug flag */
> extern int mi_debug_p;
>
> extern void mi_execute_command (const char *cmd, int from_tty);
>
> +/* Insert a new mi-command into the command table. Return true if
> + insertion was successful. */
> +
> +extern bool insert_mi_cmd_entry (mi_cmd_up command);
Use "mi_cmd_up &&command" ?
> +
> #endif /* MI_MI_CMDS_H */
> diff --git a/gdb/python/py-micmd.c b/gdb/python/py-micmd.c
> new file mode 100644
> index 0000000000..e99632c97a
> --- /dev/null
> +++ b/gdb/python/py-micmd.c
> @@ -0,0 +1,297 @@
> +/* MI Command Set for GDB, the GNU debugger.
> +
> + Copyright (C) 2019 Free Software Foundation, Inc.
If any of this code was posted in previous years, please write
201x-2019 for the year range (with x replaced with the proper
digit, of course). Likewise all other files in the patch.
> +
> + 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/>. */
> +
> +/* gdb MI commands implemented in Python */
> +
> +#include "defs.h"
> +#include "python-internal.h"
> +#include "python/py-micmd.h"
> +#include "arch-utils.h"
> +#include "charset.h"
> +#include "language.h"
> +
> +#include <string>
> +
> +static PyObject *invoke_cst;
Document.
> +
> +extern PyTypeObject
> + micmdpy_object_type CPYCHECKER_TYPE_OBJECT_FOR_TYPEDEF ("micmdpy_object");
Is there a reason this is "extern"? I don't see this used anywhere
outside py-micmd.c.
> +
> +/* If the command invoked returns a list, this function parses it and create an
> + appropriate MI out output.
> +
> + The returned values must be Python string,
"values ... string" doesn't parse correctly for me.
Did you mean
"The returned value must be a Python string
?
> and can be contained within Python
> + lists and dictionaries.
I think I'm a bit more confused now. :-)
Can you clarify this please?
> + lists and dictionaries. It is possible to have a multiple levels of lists
Double space after periods.
"a multiple levels" => "multiple levels"
> + and/or dictionaries. */
> +
> +static void
> +parse_mi_result (PyObject *result, const char *field_name)
> +{
> + struct ui_out *uiout = current_uiout;
> +
> + if (PyDict_Check (result))
> + {
> + PyObject *key, *value;
> + Py_ssize_t pos = 0;
> + ui_out_emit_tuple tuple_emitter (uiout, field_name);
> + while (PyDict_Next (result, &pos, &key, &value))
> + {
> + if (!PyString_Check (key))
> + {
> + gdbpy_ref<> key_repr (PyObject_Repr (key));
> + if (PyErr_Occurred () != NULL)
> + {
> + gdbpy_err_fetch ex;
> + gdb::unique_xmalloc_ptr<char> ex_msg (ex.to_string ());
> +
> + if (ex_msg == NULL || *ex_msg == '\0')
> + error (_("Non-string object used as key."));
> + else
> + error (_("Non-string object used as key: %s."),
> + ex_msg.get ());
> + }
> + else
> + {
> + auto key_repr_string
> + = python_string_to_target_string (key_repr.get ());
> + error (_("Non-string object used as key: %s."),
> + key_repr_string.get ());
> + }
> + }
There's aspace vs tabs mixup above, and in other parts
of the file too. Please fix that throughout.
> +
> + auto key_string = python_string_to_target_string (key);
> + parse_mi_result (value, key_string.get ());
> + }
> + }
> + else if (PySequence_Check (result) && !PyString_Check (result))
> + {
> + ui_out_emit_list list_emitter (uiout, field_name);
> + for (Py_ssize_t i = 0; i < PySequence_Size (result); ++i)
> + {
> + gdbpy_ref<> item (PySequence_ITEM (result, i));
> + parse_mi_result (item.get (), NULL);
> + }
> + }
> + else if (PyIter_Check (result))
> + {
> + gdbpy_ref<> item;
> + ui_out_emit_list list_emitter (uiout, field_name);
> + while (item.reset (PyIter_Next (result)), item != nullptr)
> + parse_mi_result (item.get (), NULL);
> + }
> + else
> + {
> + gdb::unique_xmalloc_ptr<char> string (gdbpy_obj_to_string (result));
> + uiout->field_string (field_name, string.get ());
> + }
> +}
> +
> +/* Object initializer; sets up gdb-side structures for MI command.
"for an MI command", I suppose?
> +
> + Use: __init__(NAME).
Did you mean "Usage:"? Or that this function implements
__init__?
> +
> + NAME is the name of the MI command to register. It must start with a dash
> + as traditional MI commands do. */
> +
> +static int
> +micmdpy_init (PyObject *self, PyObject *args, PyObject *kw)
> +{
> + const char *name;
> + gdbpy_ref<> self_ref = gdbpy_ref<>::new_reference (self);
> +
> + if (!PyArg_ParseTuple (args, "s", &name))
> + return -1;
> +
> + /* Validate command name */
Period and double space.
> + const int name_len = strlen (name);
> + if (name_len == 0)
> + {
> + error (_("MI command name is empty."));
> + return -1;
the return line is unreacheable, since error throws.
Remove it, and then remove the unnecessary braces.
> + }
> + else if ((name_len < 2) || (name[0] != '-') || !isalnum (name[1]))
Please remove reduntant parens:
else if (name_len < 2 || name[0] != '-' || !isalnum (name[1]))
> + {
> + error (_("MI command name does not start with '-'"
> + " followed by at least one letter or digit."));
> + return -1;
Likewise remove the return line.
> + }
> + else
Since the conditions above if reached never return you
could drop the "else"s, which removes this indentation level.
Also, I'd use "== 1" instead of "< 2", since you've already
checked 0.
Like:
if (name_len == 0)
error (_("MI command name is empty."));
if (name_len == 1 || name[0] != '-' || !isalnum name[1])
error (_("MI command name does not start with '-'"
" followed by at least one letter or digit."));
for (int i = 2; i < name_len; i++)
{
...
> + for (int i = 2; i < name_len; i++)
> + {
> + if (!isalnum (name[i]) && name[i] != '-')
> + {
> + error (_("MI command name contains invalid character: %c."),
> + name[i]);
> + return -1;
Ditto re. the return after error.
> + }
> + }
> +
> + if (!PyObject_HasAttr (self_ref.get (), invoke_cst))
> + error (_("-%s: Python command object missing 'invoke' method."), name);
Indentation of "error" doesn't look right.
> +
> + try
> + {
> + mi_cmd_up micommand = mi_cmd_up(new mi_command_py (name + 1, self_ref));
> +
> + bool result = insert_mi_cmd_entry (std::move (micommand));
> +
> + if (!result)
> + {
> + error (_("Unable to insert command."
> + "The name might already be in use."));
Indentation isn't right here.
> + return -1;
Remove, unreachable.
> + }
> + }
> + catch (const gdb_exception &except)
> + {
> + GDB_PY_SET_HANDLE_EXCEPTION (except);
> + }
> +
> + return 0;
> +}
> +
> +mi_command_py::mi_command_py (const char *name, gdbpy_ref<> object)
> + : mi_command (name, NULL), pyobj (object)
> +{
> +}
> +
> +void
> +mi_command_py::do_invoke (struct mi_parse *parse)
> +{
> + mi_parse_argv (parse->args, parse);
> +
> + if (parse->argv == NULL)
> + error (_("Problem parsing arguments: %s %s"), parse->command, parse->args);
> +
> + PyObject *obj = this->pyobj.get ();
> +
> + gdbpy_enter enter_py (get_current_arch (), current_language);
> +
> + gdb_assert (obj != nullptr);
> +
> + if (!PyObject_HasAttr (obj, invoke_cst))
> + error (_("-%s: Python command object missing 'invoke' method."),
> + name ().c_str ());
> +
> +
> + gdbpy_ref<> argobj (PyList_New (parse->argc));
> + if (argobj == nullptr)
> + {
> + gdbpy_print_stack ();
> + error (_("-%s: failed to create the Python arguments list."),
> + name ().c_str ());
> + }
> +
> + for (int i = 0; i < parse->argc; ++i)
> + {
> + gdbpy_ref<> str (PyUnicode_Decode (parse->argv[i], strlen (parse->argv[i]),
> + host_charset (), NULL));
> + if (PyList_SetItem (argobj.get (), i, str.release ()) != 0)
> + {
> + error (_("-%s: failed to create the Python arguments list."),
> + name ().c_str ());
> + }
> + }
> +
> + gdb_assert (PyErr_Occurred () == NULL);
> + gdbpy_ref<> result (
> + PyObject_CallMethodObjArgs (obj, invoke_cst, argobj.get (), NULL));
> + if (PyErr_Occurred () != NULL)
> + {
> + gdbpy_err_fetch ex;
> + gdb::unique_xmalloc_ptr<char> ex_msg (ex.to_string ());
> +
> + if (ex_msg == NULL || *ex_msg == '\0')
> + error (_("-%s: failed to execute command"), name ().c_str ());
> + else
> + error (_("-%s: %s"), name ().c_str (), ex_msg.get ());
> + }
> + else
> + {
> + if (Py_None != result)
> + parse_mi_result (result.get (), "result");
> + }
> +}
> +
> +void mi_command_py::finalize ()
Line break after void.
> +{
> + this->pyobj.reset (nullptr);
> +}
> +
> +/* Initialize the MI command object. */
> +
> +int
> +gdbpy_initialize_micommands ()
> +{
> + micmdpy_object_type.tp_new = PyType_GenericNew;
> + if (PyType_Ready (&micmdpy_object_type) < 0)
> + return -1;
> +
> + if (gdb_pymodule_addobject (gdb_module, "MICommand",
> + (PyObject *) &micmdpy_object_type)
> + < 0)
> + return -1;
> +
> + invoke_cst = PyString_FromString ("invoke");
> + if (invoke_cst == NULL)
> + return -1;
> +
> + return 0;
> +}
> +
> +static PyMethodDef micmdpy_object_methods[] = {{0}};
> +
> +PyTypeObject micmdpy_object_type = {
Can this be static?
> + PyVarObject_HEAD_INIT (NULL, 0) "gdb.MICommand", /*tp_name */
Line break between the PyVarObject_HEAD_INIT statement
and "gdb.MICommand".
> + sizeof (micmdpy_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 mi-command object", /* tp_doc */
> + 0, /* tp_traverse */
> + 0, /* tp_clear */
> + 0, /* tp_richcompare */
> + 0, /* tp_weaklistoffset */
> + 0, /* tp_iter */
> + 0, /* tp_iternext */
> + micmdpy_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 */
> + micmdpy_init, /* tp_init */
> + 0, /* tp_alloc */
> +};
> diff --git a/gdb/python/py-micmd.h b/gdb/python/py-micmd.h
> new file mode 100644
> index 0000000000..deadc0116b
> --- /dev/null
> +++ b/gdb/python/py-micmd.h
> @@ -0,0 +1,60 @@
> +/* MI Command Set for GDB, the GNU debugger.
> +
> + Copyright (C) 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/>. */
> +
> +#ifndef PY_MICMDS_H
> +#define PY_MICMDS_H
> +
> +#include "mi/mi-cmds.h"
> +#include "mi/mi-parse.h"
> +#include "python-internal.h"
> +#include "python/py-ref.h"
> +
> +struct micmdpy_object
> +{
> + PyObject_HEAD
> +};
> +
> +typedef struct micmdpy_object micmdpy_object;
This typedef shouldn't be needed.
> +
> +/* MI command implemented in Python. */
> +
> +class mi_command_py : public mi_command
> +{
> + public:
Indentation of "public" etc. should be under "class".
I think you fixed other files in previous iterations but
this was left behind.
> + /* Constructs a new mi_command_py object. NAME is command name without
> + leading dash. OBJECT is a reference to a Python object implementing
> + the command. This object should inherit from gdb.MICommand and should
> + implement method invoke (args). */
> +
> + mi_command_py (const char *name, gdbpy_ref<> object);
> +
> +
> + /* This is called just before shutting down a Python interpreter
> + to release python object implementing the command. */
..."to release THE python"...
Double space after period.
> +
> + void finalize ();
> +
> + protected:
> + virtual void do_invoke(struct mi_parse *parse) override;
Missing space before parens. Drop the "virtual".
> +
> + private:
> + gdbpy_ref<> pyobj;
Should be called "m_pyobj". And should have a describing comment.
> +};
> +
> +#endif
> diff --git a/gdb/python/python-internal.h b/gdb/python/python-internal.h
> index 69ff1fe30d..f28027741e 100644
> --- a/gdb/python/python-internal.h
> +++ b/gdb/python/python-internal.h
> @@ -539,6 +539,8 @@ int gdbpy_initialize_xmethods (void)
> CPYCHECKER_NEGATIVE_RESULT_SETS_EXCEPTION;
> int gdbpy_initialize_unwind (void)
> CPYCHECKER_NEGATIVE_RESULT_SETS_EXCEPTION;
> +int gdbpy_initialize_micommands (void)
> + CPYCHECKER_NEGATIVE_RESULT_SETS_EXCEPTION;
>
> /* A wrapper for PyErr_Fetch that handles reference counting for the
> caller. */
> diff --git a/gdb/python/python.c b/gdb/python/python.c
> index 4dad8ec10d..901c0a4edc 100644
> --- a/gdb/python/python.c
> +++ b/gdb/python/python.c
> @@ -36,6 +36,8 @@
> #include <ctype.h>
> #include "location.h"
> #include "ser-event.h"
> +#include "mi/mi-cmds.h"
> +#include "py-micmd.h"
>
> /* Declared constants and enum for python stack printing. */
> static const char python_excp_none[] = "none";
> @@ -1564,6 +1566,14 @@ finalize_python (void *ignore)
> python_gdbarch = target_gdbarch ();
> python_language = current_language;
>
> + for (const auto& name_and_cmd : mi_cmd_table)
The "&" should be leaning on the right side, like
we format "*":
const auto &name_and_cmd
> + {
> + mi_command *cmd = name_and_cmd.second.get ();
> + mi_command_py *cmd_py = dynamic_cast<mi_command_py*> (cmd);
> + if (cmd_py != nullptr)
> + cmd_py->finalize ();
> + }
> +
> Py_Finalize ();
>
> restore_active_ext_lang (previous_active);
> @@ -1698,7 +1708,8 @@ do_start_initialization ()
> || gdbpy_initialize_event () < 0
> || gdbpy_initialize_arch () < 0
> || gdbpy_initialize_xmethods () < 0
> - || gdbpy_initialize_unwind () < 0)
> + || gdbpy_initialize_unwind () < 0
> + || gdbpy_initialize_micommands () < 0)
> return false;
>
> #define GDB_PY_DEFINE_EVENT_TYPE(name, py_name, doc, base) \
>
Thanks,
Pedro Alves
@@ -1,3 +1,26 @@
+2019-05-02 Didier Nadeau <didier.nadeau@gmail.com>
+ Jan Vrany <jan.vrany@fit.cvut.cz>
+
+ * Makefile.in (SUBDIR_PYTHON_SRCS): Add py-micmd.c.
+ * mi/mi-cmds.c (insert_mi_cmd_entry): Remove static.
+ (mi_cmd_table): Remove static.
+ * mi/mi-cmds.h (insert_mi_cmd_entry): New declaration.
+ (mi_cmd_table): New declaration.
+ * python/py-micmd.c: New file
+ (parse_mi_result): New function.
+ (micmdpy_init): New function.
+ (gdbpy_initialize_micommands): New function.
+ (mi_command_py): New class.
+ * python/py-micmd.h: New file
+ (micmdpy_object): New struct.
+ (micmdpy_object): New typedef.
+ (mi_command_py): New class.
+ * python/python-internal.h
+ (gdbpy_initialize_micommands): New declaration.
+ * python/python.c
+ (_initialize_python): New call to gdbpy_initialize_micommands.
+ (finalize_python): Finalize Python MI commands.
+
2019-05-02 Didier Nadeau <didier.nadeau@gmail.com>
Jan Vrany <jan.vrany@fit.cvut.cz>
@@ -382,6 +382,7 @@ SUBDIR_PYTHON_SRCS = \
python/py-instruction.c \
python/py-lazy-string.c \
python/py-linetable.c \
+ python/py-micmd.c \
python/py-newobjfileevent.c \
python/py-objfile.c \
python/py-param.c \
@@ -28,12 +28,11 @@
/* MI command table (built at run time). */
-static std::map<std::string, mi_cmd_up> mi_cmd_table;
+std::map<std::string, mi_cmd_up> mi_cmd_table;
-/* Insert a new mi-command into the command table. Return true if
- insertion was successful. */
+/* See mi-cmds.h. */
-static bool
+bool
insert_mi_cmd_entry (mi_cmd_up command)
{
gdb_assert (command != NULL);
@@ -22,6 +22,8 @@
#ifndef MI_MI_CMDS_H
#define MI_MI_CMDS_H
+#include <map>
+
enum print_values {
PRINT_NO_VALUES,
PRINT_ALL_VALUES,
@@ -191,9 +193,16 @@ typedef std::unique_ptr<mi_command> mi_cmd_up;
extern mi_command *mi_cmd_lookup (const char *command);
+extern std::map<std::string, mi_cmd_up> mi_cmd_table;
+
/* Debug flag */
extern int mi_debug_p;
extern void mi_execute_command (const char *cmd, int from_tty);
+/* Insert a new mi-command into the command table. Return true if
+ insertion was successful. */
+
+extern bool insert_mi_cmd_entry (mi_cmd_up command);
+
#endif /* MI_MI_CMDS_H */
new file mode 100644
@@ -0,0 +1,297 @@
+/* MI Command Set for GDB, the GNU debugger.
+
+ Copyright (C) 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/>. */
+
+/* gdb MI commands implemented in Python */
+
+#include "defs.h"
+#include "python-internal.h"
+#include "python/py-micmd.h"
+#include "arch-utils.h"
+#include "charset.h"
+#include "language.h"
+
+#include <string>
+
+static PyObject *invoke_cst;
+
+extern PyTypeObject
+ micmdpy_object_type CPYCHECKER_TYPE_OBJECT_FOR_TYPEDEF ("micmdpy_object");
+
+/* If the command invoked returns a list, this function parses it and create an
+ appropriate MI out output.
+
+ The returned values must be Python string, and can be contained within Python
+ lists and dictionaries. It is possible to have a multiple levels of lists
+ and/or dictionaries. */
+
+static void
+parse_mi_result (PyObject *result, const char *field_name)
+{
+ struct ui_out *uiout = current_uiout;
+
+ if (PyDict_Check (result))
+ {
+ PyObject *key, *value;
+ Py_ssize_t pos = 0;
+ ui_out_emit_tuple tuple_emitter (uiout, field_name);
+ while (PyDict_Next (result, &pos, &key, &value))
+ {
+ if (!PyString_Check (key))
+ {
+ gdbpy_ref<> key_repr (PyObject_Repr (key));
+ if (PyErr_Occurred () != NULL)
+ {
+ gdbpy_err_fetch ex;
+ gdb::unique_xmalloc_ptr<char> ex_msg (ex.to_string ());
+
+ if (ex_msg == NULL || *ex_msg == '\0')
+ error (_("Non-string object used as key."));
+ else
+ error (_("Non-string object used as key: %s."),
+ ex_msg.get ());
+ }
+ else
+ {
+ auto key_repr_string
+ = python_string_to_target_string (key_repr.get ());
+ error (_("Non-string object used as key: %s."),
+ key_repr_string.get ());
+ }
+ }
+
+ auto key_string = python_string_to_target_string (key);
+ parse_mi_result (value, key_string.get ());
+ }
+ }
+ else if (PySequence_Check (result) && !PyString_Check (result))
+ {
+ ui_out_emit_list list_emitter (uiout, field_name);
+ for (Py_ssize_t i = 0; i < PySequence_Size (result); ++i)
+ {
+ gdbpy_ref<> item (PySequence_ITEM (result, i));
+ parse_mi_result (item.get (), NULL);
+ }
+ }
+ else if (PyIter_Check (result))
+ {
+ gdbpy_ref<> item;
+ ui_out_emit_list list_emitter (uiout, field_name);
+ while (item.reset (PyIter_Next (result)), item != nullptr)
+ parse_mi_result (item.get (), NULL);
+ }
+ else
+ {
+ gdb::unique_xmalloc_ptr<char> string (gdbpy_obj_to_string (result));
+ uiout->field_string (field_name, string.get ());
+ }
+}
+
+/* Object initializer; sets up gdb-side structures for MI command.
+
+ Use: __init__(NAME).
+
+ NAME is the name of the MI command to register. It must start with a dash
+ as traditional MI commands do. */
+
+static int
+micmdpy_init (PyObject *self, PyObject *args, PyObject *kw)
+{
+ const char *name;
+ gdbpy_ref<> self_ref = gdbpy_ref<>::new_reference (self);
+
+ if (!PyArg_ParseTuple (args, "s", &name))
+ return -1;
+
+ /* Validate command name */
+ const int name_len = strlen (name);
+ if (name_len == 0)
+ {
+ error (_("MI command name is empty."));
+ return -1;
+ }
+ else if ((name_len < 2) || (name[0] != '-') || !isalnum (name[1]))
+ {
+ error (_("MI command name does not start with '-'"
+ " followed by at least one letter or digit."));
+ return -1;
+ }
+ else
+ for (int i = 2; i < name_len; i++)
+ {
+ if (!isalnum (name[i]) && name[i] != '-')
+ {
+ error (_("MI command name contains invalid character: %c."),
+ name[i]);
+ return -1;
+ }
+ }
+
+ if (!PyObject_HasAttr (self_ref.get (), invoke_cst))
+ error (_("-%s: Python command object missing 'invoke' method."), name);
+
+ try
+ {
+ mi_cmd_up micommand = mi_cmd_up(new mi_command_py (name + 1, self_ref));
+
+ bool result = insert_mi_cmd_entry (std::move (micommand));
+
+ if (!result)
+ {
+ error (_("Unable to insert command."
+ "The name might already be in use."));
+ return -1;
+ }
+ }
+ catch (const gdb_exception &except)
+ {
+ GDB_PY_SET_HANDLE_EXCEPTION (except);
+ }
+
+ return 0;
+}
+
+mi_command_py::mi_command_py (const char *name, gdbpy_ref<> object)
+ : mi_command (name, NULL), pyobj (object)
+{
+}
+
+void
+mi_command_py::do_invoke (struct mi_parse *parse)
+{
+ mi_parse_argv (parse->args, parse);
+
+ if (parse->argv == NULL)
+ error (_("Problem parsing arguments: %s %s"), parse->command, parse->args);
+
+ PyObject *obj = this->pyobj.get ();
+
+ gdbpy_enter enter_py (get_current_arch (), current_language);
+
+ gdb_assert (obj != nullptr);
+
+ if (!PyObject_HasAttr (obj, invoke_cst))
+ error (_("-%s: Python command object missing 'invoke' method."),
+ name ().c_str ());
+
+
+ gdbpy_ref<> argobj (PyList_New (parse->argc));
+ if (argobj == nullptr)
+ {
+ gdbpy_print_stack ();
+ error (_("-%s: failed to create the Python arguments list."),
+ name ().c_str ());
+ }
+
+ for (int i = 0; i < parse->argc; ++i)
+ {
+ gdbpy_ref<> str (PyUnicode_Decode (parse->argv[i], strlen (parse->argv[i]),
+ host_charset (), NULL));
+ if (PyList_SetItem (argobj.get (), i, str.release ()) != 0)
+ {
+ error (_("-%s: failed to create the Python arguments list."),
+ name ().c_str ());
+ }
+ }
+
+ gdb_assert (PyErr_Occurred () == NULL);
+ gdbpy_ref<> result (
+ PyObject_CallMethodObjArgs (obj, invoke_cst, argobj.get (), NULL));
+ if (PyErr_Occurred () != NULL)
+ {
+ gdbpy_err_fetch ex;
+ gdb::unique_xmalloc_ptr<char> ex_msg (ex.to_string ());
+
+ if (ex_msg == NULL || *ex_msg == '\0')
+ error (_("-%s: failed to execute command"), name ().c_str ());
+ else
+ error (_("-%s: %s"), name ().c_str (), ex_msg.get ());
+ }
+ else
+ {
+ if (Py_None != result)
+ parse_mi_result (result.get (), "result");
+ }
+}
+
+void mi_command_py::finalize ()
+{
+ this->pyobj.reset (nullptr);
+}
+
+/* Initialize the MI command object. */
+
+int
+gdbpy_initialize_micommands ()
+{
+ micmdpy_object_type.tp_new = PyType_GenericNew;
+ if (PyType_Ready (&micmdpy_object_type) < 0)
+ return -1;
+
+ if (gdb_pymodule_addobject (gdb_module, "MICommand",
+ (PyObject *) &micmdpy_object_type)
+ < 0)
+ return -1;
+
+ invoke_cst = PyString_FromString ("invoke");
+ if (invoke_cst == NULL)
+ return -1;
+
+ return 0;
+}
+
+static PyMethodDef micmdpy_object_methods[] = {{0}};
+
+PyTypeObject micmdpy_object_type = {
+ PyVarObject_HEAD_INIT (NULL, 0) "gdb.MICommand", /*tp_name */
+ sizeof (micmdpy_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 mi-command object", /* tp_doc */
+ 0, /* tp_traverse */
+ 0, /* tp_clear */
+ 0, /* tp_richcompare */
+ 0, /* tp_weaklistoffset */
+ 0, /* tp_iter */
+ 0, /* tp_iternext */
+ micmdpy_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 */
+ micmdpy_init, /* tp_init */
+ 0, /* tp_alloc */
+};
new file mode 100644
@@ -0,0 +1,60 @@
+/* MI Command Set for GDB, the GNU debugger.
+
+ Copyright (C) 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/>. */
+
+#ifndef PY_MICMDS_H
+#define PY_MICMDS_H
+
+#include "mi/mi-cmds.h"
+#include "mi/mi-parse.h"
+#include "python-internal.h"
+#include "python/py-ref.h"
+
+struct micmdpy_object
+{
+ PyObject_HEAD
+};
+
+typedef struct micmdpy_object micmdpy_object;
+
+/* MI command implemented in Python. */
+
+class mi_command_py : public mi_command
+{
+ public:
+ /* Constructs a new mi_command_py object. NAME is command name without
+ leading dash. OBJECT is a reference to a Python object implementing
+ the command. This object should inherit from gdb.MICommand and should
+ implement method invoke (args). */
+
+ mi_command_py (const char *name, gdbpy_ref<> object);
+
+
+ /* This is called just before shutting down a Python interpreter
+ to release python object implementing the command. */
+
+ void finalize ();
+
+ protected:
+ virtual void do_invoke(struct mi_parse *parse) override;
+
+ private:
+ gdbpy_ref<> pyobj;
+};
+
+#endif
@@ -539,6 +539,8 @@ int gdbpy_initialize_xmethods (void)
CPYCHECKER_NEGATIVE_RESULT_SETS_EXCEPTION;
int gdbpy_initialize_unwind (void)
CPYCHECKER_NEGATIVE_RESULT_SETS_EXCEPTION;
+int gdbpy_initialize_micommands (void)
+ CPYCHECKER_NEGATIVE_RESULT_SETS_EXCEPTION;
/* A wrapper for PyErr_Fetch that handles reference counting for the
caller. */
@@ -36,6 +36,8 @@
#include <ctype.h>
#include "location.h"
#include "ser-event.h"
+#include "mi/mi-cmds.h"
+#include "py-micmd.h"
/* Declared constants and enum for python stack printing. */
static const char python_excp_none[] = "none";
@@ -1564,6 +1566,14 @@ finalize_python (void *ignore)
python_gdbarch = target_gdbarch ();
python_language = current_language;
+ for (const auto& name_and_cmd : mi_cmd_table)
+ {
+ mi_command *cmd = name_and_cmd.second.get ();
+ mi_command_py *cmd_py = dynamic_cast<mi_command_py*> (cmd);
+ if (cmd_py != nullptr)
+ cmd_py->finalize ();
+ }
+
Py_Finalize ();
restore_active_ext_lang (previous_active);
@@ -1698,7 +1708,8 @@ do_start_initialization ()
|| gdbpy_initialize_event () < 0
|| gdbpy_initialize_arch () < 0
|| gdbpy_initialize_xmethods () < 0
- || gdbpy_initialize_unwind () < 0)
+ || gdbpy_initialize_unwind () < 0
+ || gdbpy_initialize_micommands () < 0)
return false;
#define GDB_PY_DEFINE_EVENT_TYPE(name, py_name, doc, base) \