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Define unique_ptr specialization for Py_buffer.

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This patch causes PyBuffer_Release() to be called when the associated
buffer goes out of scope.  I've been using it as follows:

 ...
 Py_buffer_up buffer_up;
 Py_buffer py_buf;

 if (PyObject_CheckBuffer (obj)
     && PyObject_GetBuffer (obj, &py_buf, PyBUF_SIMPLE) == 0)
   {
      /* Got a buffer, py_buf, out of obj.  Cause it to released
         when it goes out of scope.  */
     buffer_up.reset (&py_buf);
   }
   ...

This snippet of code was taken directly from an upcoming patch to
python-value.c.

gdb/ChangeLog:

	* python/python-internal.h (Py_buffer_deleter): New struct.
	(Py_buffer_up): New typedef.
This commit is contained in:
Kevin Buettner
2019-02-16 17:33:47 -07:00
parent c31307f9c5
commit 26c897821b
2 changed files with 18 additions and 0 deletions
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13
gdb/python/python-internal.h
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@ -801,4 +801,17 @@ struct varobj;
struct varobj_iter *py_varobj_get_iterator (struct varobj *var,
PyObject *printer);
/* Deleter for Py_buffer unique_ptr specialization. */
struct Py_buffer_deleter
{
void operator() (Py_buffer *b) const
{
PyBuffer_Release (b);
}
};
/* A unique_ptr specialization for Py_buffer. */
typedef std::unique_ptr<Py_buffer, Py_buffer_deleter> Py_buffer_up;
#endif /* PYTHON_PYTHON_INTERNAL_H */