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/* Copyright (C) 2013-2020 Free Software Foundation, Inc.
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 "python-internal.h"
#include "varobj.h"
#include "varobj-iter.h"
/* A dynamic varobj iterator "class" for python pretty-printed
varobjs. This inherits struct varobj_iter. */
struct py_varobj_iter : public varobj_iter
{
py_varobj_iter (struct varobj *var, gdbpy_ref<> &&pyiter);
~py_varobj_iter () override;
std::unique_ptr<varobj_item> next () override;
private:
/* The varobj this iterator is listing children for. */
struct varobj *m_var;
/* The next raw index we will try to check is available. If it is
equal to number_of_children, then we've already iterated the
whole set. */
int m_next_raw_index = 0;
/* The python iterator returned by the printer's 'children' method,
or NULL if not available. */
PyObject *m_iter;
};
/* Implementation of the 'dtor' method of pretty-printed varobj
iterators. */
py_varobj_iter::~py_varobj_iter ()
{
gdbpy_enter_varobj enter_py (m_var);
Py_XDECREF (m_iter);
}
/* Implementation of the 'next' method of pretty-printed varobj
iterators. */
std::unique_ptr<varobj_item>
py_varobj_iter::next ()
{
PyObject *py_v;
varobj_item *vitem;
const char *name = NULL;
if (!gdb_python_initialized)
return NULL;
gdbpy_enter_varobj enter_py (m_var);
gdbpy_ref<> item (PyIter_Next (m_iter));
if (item == NULL)
{
/* Normal end of iteration. */
if (!PyErr_Occurred ())
return NULL;
/* If we got a memory error, just use the text as the item. */
if (PyErr_ExceptionMatches (gdbpy_gdb_memory_error))
{
gdbpy_err_fetch fetched_error;
gdb::unique_xmalloc_ptr<char> value_str = fetched_error.to_string ();
if (value_str == NULL)
{
gdbpy_print_stack ();
return NULL;
}
std::string name_str = string_printf ("<error at %d>",
m_next_raw_index++);
item.reset (Py_BuildValue ("(ss)", name_str.c_str (),
value_str.get ()));
if (item == NULL)
{
gdbpy_print_stack ();
return NULL;
}
}
else
{
/* Any other kind of error. */
gdbpy_print_stack ();
return NULL;
}
}
if (!PyArg_ParseTuple (item.get (), "sO", &name, &py_v))
{
gdbpy_print_stack ();
error (_("Invalid item from the child list"));
}
vitem = new varobj_item ();
vitem->value = release_value (convert_value_from_python (py_v));
if (vitem->value == NULL)
gdbpy_print_stack ();
vitem->name = name;
m_next_raw_index++;
return std::unique_ptr<varobj_item> (vitem);
}
/* Constructor of pretty-printed varobj iterators. VAR is the varobj
whose children the iterator will be iterating over. PYITER is the
python iterator actually responsible for the iteration. */
py_varobj_iter::py_varobj_iter (struct varobj *var, gdbpy_ref<> &&pyiter)
: m_var (var),
m_iter (pyiter.release ())
{
}
/* Return a new pretty-printed varobj iterator suitable to iterate
over VAR's children. */
std::unique_ptr<varobj_iter>
py_varobj_get_iterator (struct varobj *var, PyObject *printer)
{
gdbpy_enter_varobj enter_py (var);
if (!PyObject_HasAttr (printer, gdbpy_children_cst))
return NULL;
gdbpy_ref<> children (PyObject_CallMethodObjArgs (printer, gdbpy_children_cst,
NULL));
if (children == NULL)
{
gdbpy_print_stack ();
error (_("Null value returned for children"));
}
gdbpy_ref<> iter (PyObject_GetIter (children.get ()));
if (iter == NULL)
{
gdbpy_print_stack ();
error (_("Could not get children iterator"));
}
return std::unique_ptr<varobj_iter> (new py_varobj_iter (var,
std::move (iter)));
}
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