299 lines
8.2 KiB
C
299 lines
8.2 KiB
C
/* Python interface to lazy strings.
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Copyright (C) 2010 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "python-internal.h"
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#include "charset.h"
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#include "value.h"
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#include "exceptions.h"
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#include "valprint.h"
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#include "language.h"
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typedef struct {
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PyObject_HEAD
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/* Holds the address of the lazy string. */
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CORE_ADDR address;
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/* Holds the encoding that will be applied to the string
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when the string is printed by GDB. If the encoding is set
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to None then GDB will select the most appropriate
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encoding when the sting is printed. */
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char *encoding;
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/* Holds the length of the string in characters. If the
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length is -1, then the string will be fetched and encoded up to
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the first null of appropriate width. */
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long length;
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/* This attribute holds the type that is represented by the lazy
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string's type. */
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struct type *type;
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} lazy_string_object;
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static PyTypeObject lazy_string_object_type;
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static PyObject *
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stpy_get_address (PyObject *self, void *closure)
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{
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lazy_string_object *self_string = (lazy_string_object *) self;
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return PyLong_FromUnsignedLongLong (self_string->address);
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}
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static PyObject *
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stpy_get_encoding (PyObject *self, void *closure)
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{
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lazy_string_object *self_string = (lazy_string_object *) self;
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PyObject *result;
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/* An encoding can be set to NULL by the user, so check before
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attempting a Python FromString call. If NULL return Py_None. */
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if (self_string->encoding)
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result = PyString_FromString (self_string->encoding);
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else
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{
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result = Py_None;
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Py_INCREF (result);
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}
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return result;
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}
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static PyObject *
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stpy_get_length (PyObject *self, void *closure)
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{
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lazy_string_object *self_string = (lazy_string_object *) self;
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return PyLong_FromLong (self_string->length);
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}
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PyObject *
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stpy_get_type (PyObject *self, void *closure)
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{
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lazy_string_object *str_obj = (lazy_string_object *) self;
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return type_to_type_object (str_obj->type);
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}
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static PyObject *
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stpy_convert_to_value (PyObject *self, PyObject *args)
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{
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lazy_string_object *self_string = (lazy_string_object *) self;
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struct value *val;
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if (self_string->address == 0)
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{
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PyErr_SetString (PyExc_MemoryError,
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_("Cannot create a value from NULL"));
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return NULL;
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}
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val = value_at_lazy (self_string->type, self_string->address);
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return value_to_value_object (val);
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}
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static void
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stpy_dealloc (PyObject *self)
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{
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lazy_string_object *self_string = (lazy_string_object *) self;
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xfree (self_string->encoding);
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}
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PyObject *
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gdbpy_create_lazy_string_object (CORE_ADDR address, long length,
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const char *encoding, struct type *type)
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{
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lazy_string_object *str_obj = NULL;
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if (address == 0 && length != 0)
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{
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PyErr_SetString (PyExc_MemoryError,
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_("Cannot create a lazy string with address 0x0, " \
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"and a non-zero length."));
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return NULL;
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}
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if (!type)
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{
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PyErr_SetString (PyExc_RuntimeError,
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"A lazy string's type cannot be NULL.");
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return NULL;
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}
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str_obj = PyObject_New (lazy_string_object, &lazy_string_object_type);
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if (!str_obj)
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return NULL;
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str_obj->address = address;
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str_obj->length = length;
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if (encoding == NULL || !strcmp (encoding, ""))
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str_obj->encoding = NULL;
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else
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str_obj->encoding = xstrdup (encoding);
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str_obj->type = type;
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return (PyObject *) str_obj;
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}
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void
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gdbpy_initialize_lazy_string (void)
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{
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if (PyType_Ready (&lazy_string_object_type) < 0)
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return;
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Py_INCREF (&lazy_string_object_type);
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}
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/* Determine whether the printer object pointed to by OBJ is a
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Python lazy string. */
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int
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gdbpy_is_lazy_string (PyObject *result)
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{
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return PyObject_TypeCheck (result, &lazy_string_object_type);
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}
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/* Extract and return the actual string from the lazy string object
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STRING. Addtionally, the string type is written to *STR_TYPE, the
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string length is written to *LENGTH, and the string encoding is
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written to *ENCODING. On error, NULL is returned. The caller is
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responsible for freeing the returned buffer. */
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gdb_byte *
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gdbpy_extract_lazy_string (PyObject *string, struct type **str_type,
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long *length, char **encoding)
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{
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int width;
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int bytes_read;
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gdb_byte *buffer = NULL;
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int errcode = 0;
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CORE_ADDR addr;
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struct gdbarch *gdbarch;
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enum bfd_endian byte_order;
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PyObject *py_len = NULL, *py_encoding = NULL;
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PyObject *py_addr = NULL, *py_type = NULL;
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volatile struct gdb_exception except;
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py_len = PyObject_GetAttrString (string, "length");
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py_encoding = PyObject_GetAttrString (string, "encoding");
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py_addr = PyObject_GetAttrString (string, "address");
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py_type = PyObject_GetAttrString (string, "type");
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/* A NULL encoding, length, address or type is not ok. */
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if (!py_len || !py_encoding || !py_addr || !py_type)
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goto error;
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*length = PyLong_AsLong (py_len);
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addr = PyLong_AsUnsignedLongLong (py_addr);
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/* If the user supplies Py_None an encoding, set encoding to NULL.
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This will trigger the resulting LA_PRINT_CALL to automatically
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select an encoding. */
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if (py_encoding == Py_None)
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*encoding = NULL;
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else
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*encoding = xstrdup (PyString_AsString (py_encoding));
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*str_type = type_object_to_type (py_type);
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gdbarch = get_type_arch (*str_type);
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byte_order = gdbarch_byte_order (gdbarch);
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width = TYPE_LENGTH (*str_type);
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TRY_CATCH (except, RETURN_MASK_ALL)
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{
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errcode = read_string (addr, *length, width,
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*length, byte_order, &buffer,
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&bytes_read);
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}
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if (except.reason < 0)
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{
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PyErr_Format (except.reason == RETURN_QUIT \
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? PyExc_KeyboardInterrupt : PyExc_RuntimeError, \
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"%s", except.message); \
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goto error;
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}
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if (errcode)
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goto error;
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*length = bytes_read / width;
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Py_DECREF (py_encoding);
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Py_DECREF (py_len);
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Py_DECREF (py_addr);
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Py_DECREF (py_type);
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return buffer;
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error:
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Py_XDECREF (py_encoding);
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Py_XDECREF (py_len);
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Py_XDECREF (py_addr);
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Py_XDECREF (py_type);
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xfree (buffer);
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*length = 0;
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*str_type = NULL;
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return NULL;
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}
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static PyMethodDef lazy_string_object_methods[] = {
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{ "value", stpy_convert_to_value, METH_NOARGS,
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"Create a (lazy) value that contains a pointer to the string." },
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{NULL} /* Sentinel */
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};
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static PyGetSetDef lazy_string_object_getset[] = {
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{ "address", stpy_get_address, NULL, "Address of the string.", NULL },
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{ "encoding", stpy_get_encoding, NULL, "Encoding of the string.", NULL },
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{ "length", stpy_get_length, NULL, "Length of the string.", NULL },
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{ "type", stpy_get_type, NULL, "Type associated with the string.", NULL },
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{ NULL } /* Sentinel */
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};
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static PyTypeObject lazy_string_object_type = {
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PyObject_HEAD_INIT (NULL)
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0, /*ob_size*/
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"gdb.LazyString", /*tp_name*/
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sizeof (lazy_string_object), /*tp_basicsize*/
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0, /*tp_itemsize*/
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stpy_dealloc, /*tp_dealloc*/
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0, /*tp_print*/
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0, /*tp_getattr*/
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0, /*tp_setattr*/
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0, /*tp_compare*/
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0, /*tp_repr*/
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0, /*tp_as_number*/
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0, /*tp_as_sequence*/
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0, /*tp_as_mapping*/
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0, /*tp_hash */
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0, /*tp_call*/
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0, /*tp_str*/
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0, /*tp_getattro*/
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0, /*tp_setattro*/
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0, /*tp_as_buffer*/
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Py_TPFLAGS_DEFAULT, /*tp_flags*/
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"GDB lazy string object", /* tp_doc */
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0, /* tp_traverse */
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0, /* tp_clear */
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0, /* tp_richcompare */
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0, /* tp_weaklistoffset */
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0, /* tp_iter */
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0, /* tp_iternext */
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lazy_string_object_methods, /* tp_methods */
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0, /* tp_members */
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lazy_string_object_getset /* tp_getset */
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};
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