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gdb: startup commands to control Python extension language

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Add two new commands to GDB that can be placed into the early
initialization to control how Python starts up.  The new options are:

  set python ignore-environment on|off
  set python dont-write-bytecode auto|on|off

  show python ignore-environment
  show python dont-write-bytecode

These can be used from GDB's startup file to control how the Python
extension language behaves.  These options are equivalent to the -E
and -B flags to python respectively, their descriptions from the
Python man page:

  -E     Ignore environment variables like PYTHONPATH and PYTHONHOME
         that modify the  behavior  of  the  interpreter.

  -B     Don't write .pyc files on import.

gdb/ChangeLog:

	* NEWS: Mention new commands.
	* python/python.c (python_ignore_environment): New static global.
	(show_python_ignore_environment): New function.
	(set_python_ignore_environment): New function.
	(python_dont_write_bytecode): New static global.
	(show_python_dont_write_bytecode): New function.
	(set_python_dont_write_bytecode): New function.
	(_initialize_python): Register new commands.

gdb/doc/ChangeLog:

	* python.texinfo (Python Commands): Mention new commands.

gdb/testsuite/ChangeLog:

	* gdb.python/py-startup-opt.exp: New file.
This commit is contained in:
Andrew Burgess 2020-08-27 16:53:13 +01:00
parent 041ca48e97
commit edeaceda7b
7 changed files with 289 additions and 0 deletions
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98
gdb/python/python.c
View file

@ -1578,6 +1578,80 @@ python_command (const char *arg, int from_tty)
#endif /* HAVE_PYTHON */
/* When this is turned on before Python is initialised then Python will
ignore any environment variables related to Python. This is equivalent
to passing `-E' to the python program. */
static bool python_ignore_environment = false;
/* Implement 'show python ignore-environment'. */
static void
show_python_ignore_environment (struct ui_file *file, int from_tty,
struct cmd_list_element *c, const char *value)
{
fprintf_filtered (file, _("Python's ignore-environment setting is %s.\n"),
value);
}
/* Implement 'set python ignore-environment'. This sets Python's internal
flag no matter when the command is issued, however, if this is used
after Py_Initialize has been called then most of the environment will
already have been read. */
static void
set_python_ignore_environment (const char *args, int from_tty,
struct cmd_list_element *c)
{
#ifdef HAVE_PYTHON
Py_IgnoreEnvironmentFlag = python_ignore_environment ? 1 : 0;
#endif
}
/* When this is turned on before Python is initialised then Python will
not write `.pyc' files on import of a module. */
static enum auto_boolean python_dont_write_bytecode = AUTO_BOOLEAN_AUTO;
/* Implement 'show python dont-write-bytecode'. */
static void
show_python_dont_write_bytecode (struct ui_file *file, int from_tty,
struct cmd_list_element *c, const char *value)
{
if (python_dont_write_bytecode == AUTO_BOOLEAN_AUTO)
{
const char *auto_string
= (python_ignore_environment
|| getenv ("PYTHONDONTWRITEBYTECODE") == nullptr) ? "off" : "on";
fprintf_filtered (file,
_("Python's dont-write-bytecode setting is %s (currently %s).\n"),
value, auto_string);
}
else
fprintf_filtered (file, _("Python's dont-write-bytecode setting is %s.\n"),
value);
}
/* Implement 'set python dont-write-bytecode'. This sets Python's internal
flag no matter when the command is issued, however, if this is used
after Py_Initialize has been called then many modules could already
have been imported and their byte code written out. */
static void
set_python_dont_write_bytecode (const char *args, int from_tty,
struct cmd_list_element *c)
{
#ifdef HAVE_PYTHON
if (python_dont_write_bytecode == AUTO_BOOLEAN_AUTO)
Py_DontWriteBytecodeFlag
= (!python_ignore_environment
&& getenv ("PYTHONDONTWRITEBYTECODE") != nullptr) ? 1 : 0;
else
Py_DontWriteBytecodeFlag
= python_dont_write_bytecode == AUTO_BOOLEAN_TRUE ? 1 : 0;
#endif /* HAVE_PYTHON */
}
/* Lists for 'set python' commands. */
@ -1880,6 +1954,30 @@ message == an error message without a stack will be printed."),
NULL, NULL,
&user_set_python_list,
&user_show_python_list);
add_setshow_boolean_cmd ("ignore-environment", no_class,
&python_ignore_environment, _("\
Set whether the Python interpreter should ignore environment variables."), _(" \
Show whether the Python interpreter showlist ignore environment variables."), _(" \
When enabled GDB's Python interpreter will ignore any Python related\n \
flags in the environment. This is equivalent to passing `-E' to a\n \
python executable."),
set_python_ignore_environment,
show_python_ignore_environment,
&user_set_python_list,
&user_show_python_list);
add_setshow_auto_boolean_cmd ("dont-write-bytecode", no_class,
&python_dont_write_bytecode, _("\
Set whether the Python interpreter should ignore environment variables."), _(" \
Show whether the Python interpreter showlist ignore environment variables."), _(" \
When enabled GDB's Python interpreter will ignore any Python related\n \
flags in the environment. This is equivalent to passing `-E' to a\n \
python executable."),
set_python_dont_write_bytecode,
show_python_dont_write_bytecode,
&user_set_python_list,
&user_show_python_list);
}
#ifdef HAVE_PYTHON