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/* Python memory buffer interface for reading inferior memory.
Copyright (C) 2009-2021 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/>. */
#include "defs.h"
#include "python-internal.h"
struct membuf_object {
PyObject_HEAD
/* Pointer to the raw data, and array of gdb_bytes. */
void *buffer;
/* The address from where the data was read, held for mbpy_str. */
CORE_ADDR addr;
/* The number of octets in BUFFER. */
CORE_ADDR length;
};
extern PyTypeObject membuf_object_type
CPYCHECKER_TYPE_OBJECT_FOR_TYPEDEF ("membuf_object");
/* Wrap BUFFER, ADDRESS, and LENGTH into a gdb.Membuf object. ADDRESS is
the address within the inferior that the contents of BUFFER were read,
and LENGTH is the number of octets in BUFFER. */
PyObject *
gdbpy_buffer_to_membuf (gdb::unique_xmalloc_ptr<gdb_byte> buffer,
CORE_ADDR address,
ULONGEST length)
{
gdbpy_ref<membuf_object> membuf_obj (PyObject_New (membuf_object,
&membuf_object_type));
if (membuf_obj == nullptr)
return nullptr;
membuf_obj->buffer = buffer.release ();
membuf_obj->addr = address;
membuf_obj->length = length;
PyObject *result;
#ifdef IS_PY3K
result = PyMemoryView_FromObject ((PyObject *) membuf_obj.get ());
#else
result = PyBuffer_FromReadWriteObject ((PyObject *) membuf_obj.get (), 0,
Py_END_OF_BUFFER);
#endif
return result;
}
/* Destructor for gdb.Membuf objects. */
static void
mbpy_dealloc (PyObject *self)
{
xfree (((membuf_object *) self)->buffer);
Py_TYPE (self)->tp_free (self);
}
/* Return a description of the gdb.Membuf object. */
static PyObject *
mbpy_str (PyObject *self)
{
membuf_object *membuf_obj = (membuf_object *) self;
return PyString_FromFormat (_("Memory buffer for address %s, \
which is %s bytes long."),
paddress (python_gdbarch, membuf_obj->addr),
pulongest (membuf_obj->length));
}
#ifdef IS_PY3K
static int
get_buffer (PyObject *self, Py_buffer *buf, int flags)
{
membuf_object *membuf_obj = (membuf_object *) self;
int ret;
ret = PyBuffer_FillInfo (buf, self, membuf_obj->buffer,
membuf_obj->length, 0,
PyBUF_CONTIG);
/* Despite the documentation saying this field is a "const char *",
in Python 3.4 at least, it's really a "char *". */
buf->format = (char *) "c";
return ret;
}
#else
static Py_ssize_t
get_read_buffer (PyObject *self, Py_ssize_t segment, void **ptrptr)
{
membuf_object *membuf_obj = (membuf_object *) self;
if (segment)
{
PyErr_SetString (PyExc_SystemError,
_("The memory buffer supports only one segment."));
return -1;
}
*ptrptr = membuf_obj->buffer;
return membuf_obj->length;
}
static Py_ssize_t
get_write_buffer (PyObject *self, Py_ssize_t segment, void **ptrptr)
{
return get_read_buffer (self, segment, ptrptr);
}
static Py_ssize_t
get_seg_count (PyObject *self, Py_ssize_t *lenp)
{
if (lenp)
*lenp = ((membuf_object *) self)->length;
return 1;
}
static Py_ssize_t
get_char_buffer (PyObject *self, Py_ssize_t segment, char **ptrptr)
{
void *ptr = nullptr;
Py_ssize_t ret;
ret = get_read_buffer (self, segment, &ptr);
*ptrptr = (char *) ptr;
return ret;
}
#endif /* IS_PY3K */
/* General Python initialization callback. */
int
gdbpy_initialize_membuf (void)
{
membuf_object_type.tp_new = PyType_GenericNew;
if (PyType_Ready (&membuf_object_type) < 0)
return -1;
return gdb_pymodule_addobject (gdb_module, "Membuf",
(PyObject *) &membuf_object_type);
}
#ifdef IS_PY3K
static PyBufferProcs buffer_procs =
{
get_buffer
};
#else
static PyBufferProcs buffer_procs = {
get_read_buffer,
get_write_buffer,
get_seg_count,
get_char_buffer
};
#endif /* IS_PY3K */
PyTypeObject membuf_object_type = {
PyVarObject_HEAD_INIT (nullptr, 0)
"gdb.Membuf", /*tp_name*/
sizeof (membuf_object), /*tp_basicsize*/
0, /*tp_itemsize*/
mbpy_dealloc, /*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*/
mbpy_str, /*tp_str*/
0, /*tp_getattro*/
0, /*tp_setattro*/
&buffer_procs, /*tp_as_buffer*/
Py_TPFLAGS_DEFAULT, /*tp_flags*/
"GDB memory buffer object", /*tp_doc*/
0, /* tp_traverse */
0, /* tp_clear */
0, /* tp_richcompare */
0, /* tp_weaklistoffset */
0, /* tp_iter */
0, /* tp_iternext */
0, /* 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 */
0, /* tp_init */
0, /* tp_alloc */
};
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