gdb/python/py-objfile.c

   1 /* Python interface to objfiles.
   2
   3    Copyright (C) 2008-2014 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include "defs.h"
  21 #include "python-internal.h"
  22 #include "charset.h"
  23 #include "objfiles.h"
  24 #include "language.h"
  25 #include "build-id.h"
  26 #include "elf-bfd.h"
  27
  28 typedef struct
  29 {
  30   PyObject_HEAD
  31
  32   /* The corresponding objfile.  */
  33   struct objfile *objfile;
  34
  35   /* Dictionary holding user-added attributes.
  36      This is the __dict__ attribute of the object.  */
  37   PyObject *dict;
  38
  39   /* The pretty-printer list of functions.  */
  40   PyObject *printers;
  41
  42   /* The frame filter list of functions.  */
  43   PyObject *frame_filters;
  44   /* The type-printer list.  */
  45   PyObject *type_printers;
  46
  47   /* The debug method matcher list.  */
  48   PyObject *xmethods;
  49 } objfile_object;
  50
  51 static PyTypeObject objfile_object_type
  52     CPYCHECKER_TYPE_OBJECT_FOR_TYPEDEF ("objfile_object");
  53
  54 static const struct objfile_data *objfpy_objfile_data_key;
  55
  56 /* Require that OBJF be a valid objfile.  */
  57 #define OBJFPY_REQUIRE_VALID(obj)                               \
  58   do {                                                          \
  59     if (!(obj)->objfile)                                        \
  60       {                                                         \
  61         PyErr_SetString (PyExc_RuntimeError,                    \
  62                          _("Objfile no longer exists."));       \
  63         return NULL;                                            \
  64       }                                                         \
  65   } while (0)
  66
  67 \f
  68
  69 /* An Objfile method which returns the objfile's file name, or None.  */
  70
  71 static PyObject *
  72 objfpy_get_filename (PyObject *self, void *closure)
  73 {
  74   objfile_object *obj = (objfile_object *) self;
  75
  76   if (obj->objfile)
  77     return PyString_Decode (objfile_name (obj->objfile),
  78                             strlen (objfile_name (obj->objfile)),
  79                             host_charset (), NULL);
  80   Py_RETURN_NONE;
  81 }
  82
  83 /* An Objfile method which returns the objfile's build id, or None.  */
  84
  85 static PyObject *
  86 objfpy_get_build_id (PyObject *self, void *closure)
  87 {
  88   objfile_object *obj = (objfile_object *) self;
  89   struct objfile *objfile = obj->objfile;
  90   const struct elf_build_id *build_id = NULL;
  91   volatile struct gdb_exception except;
  92
  93   OBJFPY_REQUIRE_VALID (obj);
  94
  95   TRY_CATCH (except, RETURN_MASK_ALL)
  96     {
  97       build_id = build_id_bfd_get (objfile->obfd);
  98     }
  99   GDB_PY_HANDLE_EXCEPTION (except);
 100
 101   if (build_id != NULL)
 102     {
 103       char *hex_form = make_hex_string (build_id->data, build_id->size);
 104       PyObject *result;
 105
 106       result = PyString_Decode (hex_form, strlen (hex_form),
 107                                 host_charset (), NULL);
 108       xfree (hex_form);
 109       return result;
 110     }
 111
 112   Py_RETURN_NONE;
 113 }
 114
 115 /* An Objfile method which returns the objfile's progspace, or None.  */
 116
 117 static PyObject *
 118 objfpy_get_progspace (PyObject *self, void *closure)
 119 {
 120   objfile_object *obj = (objfile_object *) self;
 121
 122   if (obj->objfile)
 123     {
 124       PyObject *pspace =  pspace_to_pspace_object (obj->objfile->pspace);
 125
 126       Py_XINCREF (pspace);
 127       return pspace;
 128     }
 129
 130   Py_RETURN_NONE;
 131 }
 132
 133 static void
 134 objfpy_dealloc (PyObject *o)
 135 {
 136   objfile_object *self = (objfile_object *) o;
 137
 138   Py_XDECREF (self->dict);
 139   Py_XDECREF (self->printers);
 140   Py_XDECREF (self->frame_filters);
 141   Py_XDECREF (self->type_printers);
 142   Py_XDECREF (self->xmethods);
 143   Py_TYPE (self)->tp_free (self);
 144 }
 145
 146 /* Initialize an objfile_object.
 147    The result is a boolean indicating success.  */
 148
 149 static int
 150 objfpy_initialize (objfile_object *self)
 151 {
 152   self->objfile = NULL;
 153   self->dict = NULL;
 154
 155   self->printers = PyList_New (0);
 156   if (self->printers == NULL)
 157     return 0;
 158
 159   self->frame_filters = PyDict_New ();
 160   if (self->frame_filters == NULL)
 161     return 0;
 162
 163   self->type_printers = PyList_New (0);
 164   if (self->type_printers == NULL)
 165     return 0;
 166
 167   self->xmethods = PyList_New (0);
 168   if (self->xmethods == NULL)
 169     return 0;
 170
 171   return 1;
 172 }
 173
 174 static PyObject *
 175 objfpy_new (PyTypeObject *type, PyObject *args, PyObject *keywords)
 176 {
 177   objfile_object *self = (objfile_object *) type->tp_alloc (type, 0);
 178
 179   if (self)
 180     {
 181       if (!objfpy_initialize (self))
 182         {
 183           Py_DECREF (self);
 184           return NULL;
 185         }
 186     }
 187
 188   return (PyObject *) self;
 189 }
 190
 191 PyObject *
 192 objfpy_get_printers (PyObject *o, void *ignore)
 193 {
 194   objfile_object *self = (objfile_object *) o;
 195
 196   Py_INCREF (self->printers);
 197   return self->printers;
 198 }
 199
 200 static int
 201 objfpy_set_printers (PyObject *o, PyObject *value, void *ignore)
 202 {
 203   PyObject *tmp;
 204   objfile_object *self = (objfile_object *) o;
 205
 206   if (! value)
 207     {
 208       PyErr_SetString (PyExc_TypeError,
 209                        _("Cannot delete the pretty_printers attribute."));
 210       return -1;
 211     }
 212
 213   if (! PyList_Check (value))
 214     {
 215       PyErr_SetString (PyExc_TypeError,
 216                        _("The pretty_printers attribute must be a list."));
 217       return -1;
 218     }
 219
 220   /* Take care in case the LHS and RHS are related somehow.  */
 221   tmp = self->printers;
 222   Py_INCREF (value);
 223   self->printers = value;
 224   Py_XDECREF (tmp);
 225
 226   return 0;
 227 }
 228
 229 /* Return the Python dictionary attribute containing frame filters for
 230    this object file.  */
 231 PyObject *
 232 objfpy_get_frame_filters (PyObject *o, void *ignore)
 233 {
 234   objfile_object *self = (objfile_object *) o;
 235
 236   Py_INCREF (self->frame_filters);
 237   return self->frame_filters;
 238 }
 239
 240 /* Set this object file's frame filters dictionary to FILTERS.  */
 241 static int
 242 objfpy_set_frame_filters (PyObject *o, PyObject *filters, void *ignore)
 243 {
 244   PyObject *tmp;
 245   objfile_object *self = (objfile_object *) o;
 246
 247   if (! filters)
 248     {
 249       PyErr_SetString (PyExc_TypeError,
 250                        _("Cannot delete the frame filters attribute."));
 251       return -1;
 252     }
 253
 254   if (! PyDict_Check (filters))
 255     {
 256       PyErr_SetString (PyExc_TypeError,
 257                        _("The frame_filters attribute must be a dictionary."));
 258       return -1;
 259     }
 260
 261   /* Take care in case the LHS and RHS are related somehow.  */
 262   tmp = self->frame_filters;
 263   Py_INCREF (filters);
 264   self->frame_filters = filters;
 265   Py_XDECREF (tmp);
 266
 267   return 0;
 268 }
 269
 270 /* Get the 'type_printers' attribute.  */
 271
 272 static PyObject *
 273 objfpy_get_type_printers (PyObject *o, void *ignore)
 274 {
 275   objfile_object *self = (objfile_object *) o;
 276
 277   Py_INCREF (self->type_printers);
 278   return self->type_printers;
 279 }
 280
 281 /* Get the 'xmethods' attribute.  */
 282
 283 PyObject *
 284 objfpy_get_xmethods (PyObject *o, void *ignore)
 285 {
 286   objfile_object *self = (objfile_object *) o;
 287
 288   Py_INCREF (self->xmethods);
 289   return self->xmethods;
 290 }
 291
 292 /* Set the 'type_printers' attribute.  */
 293
 294 static int
 295 objfpy_set_type_printers (PyObject *o, PyObject *value, void *ignore)
 296 {
 297   PyObject *tmp;
 298   objfile_object *self = (objfile_object *) o;
 299
 300   if (! value)
 301     {
 302       PyErr_SetString (PyExc_TypeError,
 303                        _("Cannot delete the type_printers attribute."));
 304       return -1;
 305     }
 306
 307   if (! PyList_Check (value))
 308     {
 309       PyErr_SetString (PyExc_TypeError,
 310                        _("The type_printers attribute must be a list."));
 311       return -1;
 312     }
 313
 314   /* Take care in case the LHS and RHS are related somehow.  */
 315   tmp = self->type_printers;
 316   Py_INCREF (value);
 317   self->type_printers = value;
 318   Py_XDECREF (tmp);
 319
 320   return 0;
 321 }
 322
 323 /* Implementation of gdb.Objfile.is_valid (self) -> Boolean.
 324    Returns True if this object file still exists in GDB.  */
 325
 326 static PyObject *
 327 objfpy_is_valid (PyObject *self, PyObject *args)
 328 {
 329   objfile_object *obj = (objfile_object *) self;
 330
 331   if (! obj->objfile)
 332     Py_RETURN_FALSE;
 333
 334   Py_RETURN_TRUE;
 335 }
 336
 337 \f
 338
 339 /* Clear the OBJFILE pointer in an Objfile object and remove the
 340    reference.  */
 341 static void
 342 py_free_objfile (struct objfile *objfile, void *datum)
 343 {
 344   struct cleanup *cleanup;
 345   objfile_object *object = datum;
 346
 347   cleanup = ensure_python_env (get_objfile_arch (objfile), current_language);
 348   object->objfile = NULL;
 349   Py_DECREF ((PyObject *) object);
 350   do_cleanups (cleanup);
 351 }
 352
 353 /* Return a borrowed reference to the Python object of type Objfile
 354    representing OBJFILE.  If the object has already been created,
 355    return it.  Otherwise, create it.  Return NULL and set the Python
 356    error on failure.  */
 357
 358 PyObject *
 359 objfile_to_objfile_object (struct objfile *objfile)
 360 {
 361   objfile_object *object;
 362
 363   object = objfile_data (objfile, objfpy_objfile_data_key);
 364   if (!object)
 365     {
 366       object = PyObject_New (objfile_object, &objfile_object_type);
 367       if (object)
 368         {
 369           if (!objfpy_initialize (object))
 370             {
 371               Py_DECREF (object);
 372               return NULL;
 373             }
 374
 375           object->objfile = objfile;
 376           set_objfile_data (objfile, objfpy_objfile_data_key, object);
 377         }
 378     }
 379
 380   return (PyObject *) object;
 381 }
 382
 383 int
 384 gdbpy_initialize_objfile (void)
 385 {
 386   objfpy_objfile_data_key
 387     = register_objfile_data_with_cleanup (NULL, py_free_objfile);
 388
 389   if (PyType_Ready (&objfile_object_type) < 0)
 390     return -1;
 391
 392   return gdb_pymodule_addobject (gdb_module, "Objfile",
 393                                  (PyObject *) &objfile_object_type);
 394 }
 395
 396 \f
 397
 398 static PyMethodDef objfile_object_methods[] =
 399 {
 400   { "is_valid", objfpy_is_valid, METH_NOARGS,
 401     "is_valid () -> Boolean.\n\
 402 Return true if this object file is valid, false if not." },
 403
 404   { NULL }
 405 };
 406
 407 static PyGetSetDef objfile_getset[] =
 408 {
 409   { "__dict__", gdb_py_generic_dict, NULL,
 410     "The __dict__ for this objfile.", &objfile_object_type },
 411   { "filename", objfpy_get_filename, NULL,
 412     "The objfile's filename, or None.", NULL },
 413   { "build_id", objfpy_get_build_id, NULL,
 414     "The objfile's build id, or None.", NULL },
 415   { "progspace", objfpy_get_progspace, NULL,
 416     "The objfile's progspace, or None.", NULL },
 417   { "pretty_printers", objfpy_get_printers, objfpy_set_printers,
 418     "Pretty printers.", NULL },
 419   { "frame_filters", objfpy_get_frame_filters,
 420     objfpy_set_frame_filters, "Frame Filters.", NULL },
 421   { "type_printers", objfpy_get_type_printers, objfpy_set_type_printers,
 422     "Type printers.", NULL },
 423   { "xmethods", objfpy_get_xmethods, NULL,
 424     "Debug methods.", NULL },
 425   { NULL }
 426 };
 427
 428 static PyTypeObject objfile_object_type =
 429 {
 430   PyVarObject_HEAD_INIT (NULL, 0)
 431   "gdb.Objfile",                  /*tp_name*/
 432   sizeof (objfile_object),        /*tp_basicsize*/
 433   0,                              /*tp_itemsize*/
 434   objfpy_dealloc,                 /*tp_dealloc*/
 435   0,                              /*tp_print*/
 436   0,                              /*tp_getattr*/
 437   0,                              /*tp_setattr*/
 438   0,                              /*tp_compare*/
 439   0,                              /*tp_repr*/
 440   0,                              /*tp_as_number*/
 441   0,                              /*tp_as_sequence*/
 442   0,                              /*tp_as_mapping*/
 443   0,                              /*tp_hash */
 444   0,                              /*tp_call*/
 445   0,                              /*tp_str*/
 446   0,                              /*tp_getattro*/
 447   0,                              /*tp_setattro*/
 448   0,                              /*tp_as_buffer*/
 449   Py_TPFLAGS_DEFAULT,             /*tp_flags*/
 450   "GDB objfile object",           /* tp_doc */
 451   0,                              /* tp_traverse */
 452   0,                              /* tp_clear */
 453   0,                              /* tp_richcompare */
 454   0,                              /* tp_weaklistoffset */
 455   0,                              /* tp_iter */
 456   0,                              /* tp_iternext */
 457   objfile_object_methods,         /* tp_methods */
 458   0,                              /* tp_members */
 459   objfile_getset,                 /* tp_getset */
 460   0,                              /* tp_base */
 461   0,                              /* tp_dict */
 462   0,                              /* tp_descr_get */
 463   0,                              /* tp_descr_set */
 464   offsetof (objfile_object, dict), /* tp_dictoffset */
 465   0,                              /* tp_init */
 466   0,                              /* tp_alloc */
 467   objfpy_new,                     /* tp_new */
 468 };