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Introduce gdbpy_enter

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This introduces gdbpy_enter, a class that can be used to acquire and
release the Python GIL, and also set other Python-related globals used
by gdb.  ensure_python_env is rewritten in terms of this new class.

2017-01-10  Tom Tromey  <tom@tromey.com>

	* python/python.c (gdbpy_enter): New constructor.
	(~gdbpy_enter): New destructor.
	(restore_python_env, ensure_python_env): Rewrite.
	* python/python-internal.h (gdbpy_enter): New class.
This commit is contained in:
Tom Tromey 2016-11-07 15:56:57 -07:00
parent 37fce74fb4
commit 4ecee2c47d
3 changed files with 64 additions and 37 deletions
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25
gdb/python/python-internal.h
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@ -501,6 +501,31 @@ int gdbpy_initialize_unwind (void)
struct cleanup *make_cleanup_py_decref (PyObject *py);
struct cleanup *make_cleanup_py_xdecref (PyObject *py);
/* Called before entering the Python interpreter to install the
current language and architecture to be used for Python values.
Also set the active extension language for GDB so that SIGINT's
are directed our way, and if necessary install the right SIGINT
handler. */
class gdbpy_enter
{
public:
gdbpy_enter (struct gdbarch *gdbarch, const struct language_defn *language);
~gdbpy_enter ();
gdbpy_enter (const gdbpy_enter &) = delete;
gdbpy_enter &operator= (const gdbpy_enter &) = delete;
private:
struct active_ext_lang_state *m_previous_active;
PyGILState_STATE m_state;
struct gdbarch *m_gdbarch;
const struct language_defn *m_language;
PyObject *m_error_type, *m_error_value, *m_error_traceback;
};
struct cleanup *ensure_python_env (struct gdbarch *gdbarch,
const struct language_defn *language);