gdb/python/py-inferior.c

   1 /* Python interface to inferiors.
   2
   3    Copyright (C) 2009, 2010, 2011 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 "exceptions.h"
  22 #include "gdbcore.h"
  23 #include "gdbthread.h"
  24 #include "inferior.h"
  25 #include "objfiles.h"
  26 #include "observer.h"
  27 #include "python-internal.h"
  28 #include "arch-utils.h"
  29 #include "language.h"
  30 #include "gdb_signals.h"
  31 #include "py-event.h"
  32 #include "py-stopevent.h"
  33
  34 struct threadlist_entry {
  35   thread_object *thread_obj;
  36   struct threadlist_entry *next;
  37 };
  38
  39 typedef struct
  40 {
  41   PyObject_HEAD
  42
  43   /* The inferior we represent.  */
  44   struct inferior *inferior;
  45
  46   /* thread_object instances under this inferior.  This list owns a
  47      reference to each object it contains.  */
  48   struct threadlist_entry *threads;
  49
  50   /* Number of threads in the list.  */
  51   int nthreads;
  52 } inferior_object;
  53
  54 static PyTypeObject inferior_object_type;
  55
  56 static const struct inferior_data *infpy_inf_data_key;
  57
  58 typedef struct {
  59   PyObject_HEAD
  60   void *buffer;
  61
  62   /* These are kept just for mbpy_str.  */
  63   CORE_ADDR addr;
  64   CORE_ADDR length;
  65 } membuf_object;
  66
  67 static PyTypeObject membuf_object_type;
  68
  69 /* Require that INFERIOR be a valid inferior ID.  */
  70 #define INFPY_REQUIRE_VALID(Inferior)                           \
  71   do {                                                          \
  72     if (!Inferior->inferior)                                    \
  73       {                                                         \
  74         PyErr_SetString (PyExc_RuntimeError,                    \
  75                          _("Inferior no longer exists."));      \
  76         return NULL;                                            \
  77       }                                                         \
  78   } while (0)
  79
  80 static void
  81 python_on_normal_stop (struct bpstats *bs, int print_frame)
  82 {
  83   struct cleanup *cleanup;
  84   enum target_signal stop_signal;
  85
  86   if (!find_thread_ptid (inferior_ptid))
  87       return;
  88
  89   stop_signal = inferior_thread ()->suspend.stop_signal;
  90
  91   cleanup = ensure_python_env (get_current_arch (), current_language);
  92
  93   if (emit_stop_event (bs, stop_signal) < 0)
  94     gdbpy_print_stack ();
  95
  96   do_cleanups (cleanup);
  97 }
  98
  99 static void
 100 python_on_resume (ptid_t ptid)
 101 {
 102   struct cleanup *cleanup;
 103
 104   cleanup = ensure_python_env (target_gdbarch, current_language);
 105
 106   if (emit_continue_event (ptid) < 0)
 107     gdbpy_print_stack ();
 108
 109   do_cleanups (cleanup);
 110 }
 111
 112 static void
 113 python_inferior_exit (struct inferior *inf)
 114 {
 115   struct cleanup *cleanup;
 116   const LONGEST *exit_code = NULL;
 117
 118   cleanup = ensure_python_env (target_gdbarch, current_language);
 119
 120   if (inf->has_exit_code)
 121     exit_code = &inf->exit_code;
 122
 123   if (emit_exited_event (exit_code, inf) < 0)
 124     gdbpy_print_stack ();
 125
 126   do_cleanups (cleanup);
 127 }
 128
 129 /* Callback used to notify Python listeners about new objfiles loaded in the
 130    inferior.  */
 131
 132 static void
 133 python_new_objfile (struct objfile *objfile)
 134 {
 135   struct cleanup *cleanup;
 136
 137   if (objfile == NULL)
 138     return;
 139
 140   cleanup = ensure_python_env (get_objfile_arch (objfile), current_language);
 141
 142   if (emit_new_objfile_event (objfile) < 0)
 143     gdbpy_print_stack ();
 144
 145   do_cleanups (cleanup);
 146 }
 147
 148 /* Return a reference to the Python object of type Inferior
 149    representing INFERIOR.  If the object has already been created,
 150    return it and increment the reference count,  otherwise, create it.
 151    Return NULL on failure.  */
 152 PyObject *
 153 inferior_to_inferior_object (struct inferior *inferior)
 154 {
 155   inferior_object *inf_obj;
 156
 157   inf_obj = inferior_data (inferior, infpy_inf_data_key);
 158   if (!inf_obj)
 159     {
 160       struct cleanup *cleanup;
 161       cleanup = ensure_python_env (python_gdbarch, python_language);
 162
 163       inf_obj = PyObject_New (inferior_object, &inferior_object_type);
 164       if (!inf_obj)
 165         {
 166           do_cleanups (cleanup);
 167           return NULL;
 168         }
 169
 170       inf_obj->inferior = inferior;
 171       inf_obj->threads = NULL;
 172       inf_obj->nthreads = 0;
 173
 174       set_inferior_data (inferior, infpy_inf_data_key, inf_obj);
 175
 176       do_cleanups (cleanup);
 177     }
 178   else
 179     Py_INCREF ((PyObject *)inf_obj);
 180
 181   return (PyObject *) inf_obj;
 182 }
 183
 184 /* Finds the Python Inferior object for the given PID.  Returns a
 185    reference, or NULL if PID does not match any inferior object. */
 186
 187 PyObject *
 188 find_inferior_object (int pid)
 189 {
 190   struct inflist_entry *p;
 191   struct inferior *inf = find_inferior_pid (pid);
 192
 193   if (inf)
 194     return inferior_to_inferior_object (inf);
 195
 196   return NULL;
 197 }
 198
 199 thread_object *
 200 find_thread_object (ptid_t ptid)
 201 {
 202   int pid;
 203   struct threadlist_entry *thread;
 204   PyObject *inf_obj;
 205   thread_object *found = NULL;
 206
 207   pid = PIDGET (ptid);
 208   if (pid == 0)
 209     return NULL;
 210
 211   inf_obj = find_inferior_object (pid);
 212
 213   if (! inf_obj)
 214     return NULL;
 215
 216   for (thread = ((inferior_object *)inf_obj)->threads; thread;
 217        thread = thread->next)
 218     if (ptid_equal (thread->thread_obj->thread->ptid, ptid))
 219       {
 220         found = thread->thread_obj;
 221         break;
 222       }
 223
 224   Py_DECREF (inf_obj);
 225
 226   if (found)
 227     return found;
 228
 229   return NULL;
 230 }
 231
 232 static void
 233 add_thread_object (struct thread_info *tp)
 234 {
 235   struct cleanup *cleanup;
 236   thread_object *thread_obj;
 237   inferior_object *inf_obj;
 238   struct threadlist_entry *entry;
 239
 240   cleanup = ensure_python_env (python_gdbarch, python_language);
 241
 242   thread_obj = create_thread_object (tp);
 243   if (!thread_obj)
 244     {
 245       gdbpy_print_stack ();
 246       do_cleanups (cleanup);
 247       return;
 248     }
 249
 250   inf_obj = (inferior_object *) thread_obj->inf_obj;
 251
 252   entry = xmalloc (sizeof (struct threadlist_entry));
 253   entry->thread_obj = thread_obj;
 254   entry->next = inf_obj->threads;
 255
 256   inf_obj->threads = entry;
 257   inf_obj->nthreads++;
 258
 259   do_cleanups (cleanup);
 260 }
 261
 262 static void
 263 delete_thread_object (struct thread_info *tp, int ignore)
 264 {
 265   struct cleanup *cleanup;
 266   inferior_object *inf_obj;
 267   thread_object *thread_obj;
 268   struct threadlist_entry **entry, *tmp;
 269
 270   inf_obj = (inferior_object *) find_inferior_object (PIDGET(tp->ptid));
 271   if (!inf_obj)
 272     return;
 273
 274   /* Find thread entry in its inferior's thread_list.  */
 275   for (entry = &inf_obj->threads; *entry != NULL; entry =
 276          &(*entry)->next)
 277     if ((*entry)->thread_obj->thread == tp)
 278       break;
 279
 280   if (!*entry)
 281     {
 282       Py_DECREF (inf_obj);
 283       return;
 284     }
 285
 286   cleanup = ensure_python_env (python_gdbarch, python_language);
 287
 288   tmp = *entry;
 289   tmp->thread_obj->thread = NULL;
 290
 291   *entry = (*entry)->next;
 292   inf_obj->nthreads--;
 293
 294   Py_DECREF (tmp->thread_obj);
 295   Py_DECREF (inf_obj);
 296   xfree (tmp);
 297
 298   do_cleanups (cleanup);
 299 }
 300
 301 static PyObject *
 302 infpy_threads (PyObject *self, PyObject *args)
 303 {
 304   int i;
 305   struct threadlist_entry *entry;
 306   inferior_object *inf_obj = (inferior_object *) self;
 307   PyObject *tuple;
 308
 309   INFPY_REQUIRE_VALID (inf_obj);
 310
 311   tuple = PyTuple_New (inf_obj->nthreads);
 312   if (!tuple)
 313     return NULL;
 314
 315   for (i = 0, entry = inf_obj->threads; i < inf_obj->nthreads;
 316        i++, entry = entry->next)
 317     {
 318       Py_INCREF (entry->thread_obj);
 319       PyTuple_SET_ITEM (tuple, i, (PyObject *) entry->thread_obj);
 320     }
 321
 322   return tuple;
 323 }
 324
 325 static PyObject *
 326 infpy_get_num (PyObject *self, void *closure)
 327 {
 328   inferior_object *inf = (inferior_object *) self;
 329
 330   INFPY_REQUIRE_VALID (inf);
 331
 332   return PyLong_FromLong (inf->inferior->num);
 333 }
 334
 335 static PyObject *
 336 infpy_get_pid (PyObject *self, void *closure)
 337 {
 338   inferior_object *inf = (inferior_object *) self;
 339
 340   INFPY_REQUIRE_VALID (inf);
 341
 342   return PyLong_FromLong (inf->inferior->pid);
 343 }
 344
 345 static PyObject *
 346 infpy_get_was_attached (PyObject *self, void *closure)
 347 {
 348   inferior_object *inf = (inferior_object *) self;
 349
 350   INFPY_REQUIRE_VALID (inf);
 351   if (inf->inferior->attach_flag)
 352     Py_RETURN_TRUE;
 353   Py_RETURN_FALSE;
 354 }
 355
 356 static int
 357 build_inferior_list (struct inferior *inf, void *arg)
 358 {
 359   PyObject *list = arg;
 360   PyObject *inferior = inferior_to_inferior_object (inf);
 361   int success = 0;
 362
 363   if (! inferior)
 364     return 0;
 365
 366   success = PyList_Append (list, inferior);
 367   Py_DECREF (inferior);
 368
 369   if (success)
 370     return 1;
 371
 372   return 0;
 373 }
 374
 375 /* Implementation of gdb.inferiors () -> (gdb.Inferior, ...).
 376    Returns a tuple of all inferiors.  */
 377 PyObject *
 378 gdbpy_inferiors (PyObject *unused, PyObject *unused2)
 379 {
 380   int i = 0;
 381   PyObject *list, *inferior;
 382   struct inferior *inf;
 383
 384   list = PyList_New (0);
 385   if (!list)
 386     return NULL;
 387
 388   if (iterate_over_inferiors (build_inferior_list, list))
 389     {
 390       Py_DECREF (list);
 391       return NULL;
 392     }
 393
 394   return PyList_AsTuple (list);
 395 }
 396
 397 /* Membuf and memory manipulation.  */
 398
 399 /* Implementation of gdb.read_memory (address, length).
 400    Returns a Python buffer object with LENGTH bytes of the inferior's
 401    memory at ADDRESS.  Both arguments are integers.  Returns NULL on error,
 402    with a python exception set.  */
 403 static PyObject *
 404 infpy_read_memory (PyObject *self, PyObject *args, PyObject *kw)
 405 {
 406   int error = 0;
 407   CORE_ADDR addr, length;
 408   void *buffer = NULL;
 409   membuf_object *membuf_obj;
 410   PyObject *addr_obj, *length_obj;
 411   struct cleanup *cleanups;
 412   volatile struct gdb_exception except;
 413   static char *keywords[] = { "address", "length", NULL };
 414
 415   if (! PyArg_ParseTupleAndKeywords (args, kw, "OO", keywords,
 416                                      &addr_obj, &length_obj))
 417     return NULL;
 418
 419   cleanups = make_cleanup (null_cleanup, NULL);
 420
 421   TRY_CATCH (except, RETURN_MASK_ALL)
 422     {
 423       if (!get_addr_from_python (addr_obj, &addr)
 424           || !get_addr_from_python (length_obj, &length))
 425         {
 426           error = 1;
 427           break;
 428         }
 429
 430       buffer = xmalloc (length);
 431       make_cleanup (xfree, buffer);
 432
 433       read_memory (addr, buffer, length);
 434     }
 435   if (except.reason < 0)
 436     {
 437       do_cleanups (cleanups);
 438       GDB_PY_HANDLE_EXCEPTION (except);
 439     }
 440
 441   if (error)
 442     {
 443       do_cleanups (cleanups);
 444       return NULL;
 445     }
 446
 447   membuf_obj = PyObject_New (membuf_object, &membuf_object_type);
 448   if (membuf_obj == NULL)
 449     {
 450       PyErr_SetString (PyExc_MemoryError,
 451                        _("Could not allocate memory buffer object."));
 452       do_cleanups (cleanups);
 453       return NULL;
 454     }
 455
 456   discard_cleanups (cleanups);
 457
 458   membuf_obj->buffer = buffer;
 459   membuf_obj->addr = addr;
 460   membuf_obj->length = length;
 461
 462   return PyBuffer_FromReadWriteObject ((PyObject *) membuf_obj, 0,
 463                                        Py_END_OF_BUFFER);
 464 }
 465
 466 /* Implementation of gdb.write_memory (address, buffer [, length]).
 467    Writes the contents of BUFFER (a Python object supporting the read
 468    buffer protocol) at ADDRESS in the inferior's memory.  Write LENGTH
 469    bytes from BUFFER, or its entire contents if the argument is not
 470    provided.  The function returns nothing.  Returns NULL on error, with
 471    a python exception set.  */
 472 static PyObject *
 473 infpy_write_memory (PyObject *self, PyObject *args, PyObject *kw)
 474 {
 475   Py_ssize_t buf_len;
 476   int error = 0;
 477   const char *buffer;
 478   CORE_ADDR addr, length;
 479   PyObject *addr_obj, *length_obj = NULL;
 480   volatile struct gdb_exception except;
 481   static char *keywords[] = { "address", "buffer", "length", NULL };
 482
 483
 484   if (! PyArg_ParseTupleAndKeywords (args, kw, "Os#|O", keywords,
 485                                      &addr_obj, &buffer, &buf_len,
 486                                      &length_obj))
 487     return NULL;
 488
 489   TRY_CATCH (except, RETURN_MASK_ALL)
 490     {
 491       if (!get_addr_from_python (addr_obj, &addr))
 492         {
 493           error = 1;
 494           break;
 495         }
 496
 497       if (!length_obj)
 498         length = buf_len;
 499       else if (!get_addr_from_python (length_obj, &length))
 500         {
 501           error = 1;
 502           break;
 503         }
 504       write_memory (addr, buffer, length);
 505     }
 506   GDB_PY_HANDLE_EXCEPTION (except);
 507
 508   if (error)
 509     return NULL;
 510
 511   Py_RETURN_NONE;
 512 }
 513
 514 /* Destructor of Membuf objects.  */
 515 static void
 516 mbpy_dealloc (PyObject *self)
 517 {
 518   xfree (((membuf_object *) self)->buffer);
 519   self->ob_type->tp_free (self);
 520 }
 521
 522 /* Return a description of the Membuf object.  */
 523 static PyObject *
 524 mbpy_str (PyObject *self)
 525 {
 526   membuf_object *membuf_obj = (membuf_object *) self;
 527
 528   return PyString_FromFormat (_("Memory buffer for address %s, \
 529 which is %s bytes long."),
 530                               paddress (python_gdbarch, membuf_obj->addr),
 531                               pulongest (membuf_obj->length));
 532 }
 533
 534 static Py_ssize_t
 535 get_read_buffer (PyObject *self, Py_ssize_t segment, void **ptrptr)
 536 {
 537   membuf_object *membuf_obj = (membuf_object *) self;
 538
 539   if (segment)
 540     {
 541       PyErr_SetString (PyExc_SystemError,
 542                        _("The memory buffer supports only one segment."));
 543       return -1;
 544     }
 545
 546   *ptrptr = membuf_obj->buffer;
 547
 548   return membuf_obj->length;
 549 }
 550
 551 static Py_ssize_t
 552 get_write_buffer (PyObject *self, Py_ssize_t segment, void **ptrptr)
 553 {
 554   return get_read_buffer (self, segment, ptrptr);
 555 }
 556
 557 static Py_ssize_t
 558 get_seg_count (PyObject *self, Py_ssize_t *lenp)
 559 {
 560   if (lenp)
 561     *lenp = ((membuf_object *) self)->length;
 562
 563   return 1;
 564 }
 565
 566 static Py_ssize_t
 567 get_char_buffer (PyObject *self, Py_ssize_t segment, char **ptrptr)
 568 {
 569   void *ptr = NULL;
 570   Py_ssize_t ret;
 571
 572   ret = get_read_buffer (self, segment, &ptr);
 573   *ptrptr = (char *) ptr;
 574
 575   return ret;
 576 }
 577
 578 /* Implementation of
 579    gdb.search_memory (address, length, pattern).  ADDRESS is the
 580    address to start the search.  LENGTH specifies the scope of the
 581    search from ADDRESS.  PATTERN is the pattern to search for (and
 582    must be a Python object supporting the buffer protocol).
 583    Returns a Python Long object holding the address where the pattern
 584    was located, or if the pattern was not found, returns None.  Returns NULL
 585    on error, with a python exception set.  */
 586 static PyObject *
 587 infpy_search_memory (PyObject *self, PyObject *args, PyObject *kw)
 588 {
 589   CORE_ADDR start_addr, length;
 590   static char *keywords[] = { "address", "length", "pattern", NULL };
 591   PyObject *pattern, *start_addr_obj, *length_obj;
 592   volatile struct gdb_exception except;
 593   Py_ssize_t pattern_size;
 594   const void *buffer;
 595   CORE_ADDR found_addr;
 596   int found = 0;
 597
 598   if (! PyArg_ParseTupleAndKeywords (args, kw, "OOO", keywords,
 599                                      &start_addr_obj, &length_obj,
 600                                      &pattern))
 601     return NULL;
 602
 603   if (get_addr_from_python (start_addr_obj, &start_addr)
 604       && get_addr_from_python (length_obj, &length))
 605     {
 606       if (!length)
 607         {
 608           PyErr_SetString (PyExc_ValueError,
 609                            _("Search range is empty."));
 610           return NULL;
 611         }
 612       /* Watch for overflows.  */
 613       else if (length > CORE_ADDR_MAX
 614                || (start_addr + length - 1) < start_addr)
 615         {
 616           PyErr_SetString (PyExc_ValueError,
 617                            _("The search range is too large."));
 618
 619           return NULL;
 620         }
 621     }
 622   else
 623     return NULL;
 624
 625   if (!PyObject_CheckReadBuffer (pattern))
 626     {
 627       PyErr_SetString (PyExc_RuntimeError,
 628                        _("The pattern is not a Python buffer."));
 629
 630       return NULL;
 631     }
 632
 633   if (PyObject_AsReadBuffer (pattern, &buffer, &pattern_size) == -1)
 634     return NULL;
 635
 636   TRY_CATCH (except, RETURN_MASK_ALL)
 637     {
 638       found = target_search_memory (start_addr, length,
 639                                     buffer, pattern_size,
 640                                     &found_addr);
 641     }
 642   GDB_PY_HANDLE_EXCEPTION (except);
 643
 644   if (found)
 645     return PyLong_FromLong (found_addr);
 646   else
 647     Py_RETURN_NONE;
 648 }
 649
 650 /* Implementation of gdb.Inferior.is_valid (self) -> Boolean.
 651    Returns True if this inferior object still exists in GDB.  */
 652
 653 static PyObject *
 654 infpy_is_valid (PyObject *self, PyObject *args)
 655 {
 656   inferior_object *inf = (inferior_object *) self;
 657
 658   if (! inf->inferior)
 659     Py_RETURN_FALSE;
 660
 661   Py_RETURN_TRUE;
 662 }
 663
 664 static void
 665 infpy_dealloc (PyObject *obj)
 666 {
 667   inferior_object *inf_obj = (inferior_object *) obj;
 668   struct inferior *inf = inf_obj->inferior;
 669
 670   if (! inf)
 671     return;
 672
 673   set_inferior_data (inf, infpy_inf_data_key, NULL);
 674 }
 675
 676 /* Clear the INFERIOR pointer in an Inferior object and clear the
 677    thread list.  */
 678 static void
 679 py_free_inferior (struct inferior *inf, void *datum)
 680 {
 681
 682   struct cleanup *cleanup;
 683   inferior_object *inf_obj = datum;
 684   struct threadlist_entry *th_entry, *th_tmp;
 685
 686   cleanup = ensure_python_env (python_gdbarch, python_language);
 687
 688   inf_obj->inferior = NULL;
 689
 690   /* Deallocate threads list.  */
 691   for (th_entry = inf_obj->threads; th_entry != NULL;)
 692     {
 693       Py_DECREF (th_entry->thread_obj);
 694
 695       th_tmp = th_entry;
 696       th_entry = th_entry->next;
 697       xfree (th_tmp);
 698     }
 699
 700   inf_obj->nthreads = 0;
 701
 702   Py_DECREF ((PyObject *) inf_obj);
 703   do_cleanups (cleanup);
 704 }
 705
 706 /* Implementation of gdb.selected_inferior() -> gdb.Inferior.
 707    Returns the current inferior object.  */
 708
 709 PyObject *
 710 gdbpy_selected_inferior (PyObject *self, PyObject *args)
 711 {
 712   PyObject *inf_obj;
 713
 714   inf_obj = inferior_to_inferior_object (current_inferior ());
 715   Py_INCREF (inf_obj);
 716
 717   return inf_obj;
 718 }
 719
 720 void
 721 gdbpy_initialize_inferior (void)
 722 {
 723   if (PyType_Ready (&inferior_object_type) < 0)
 724     return;
 725
 726   Py_INCREF (&inferior_object_type);
 727   PyModule_AddObject (gdb_module, "Inferior",
 728                       (PyObject *) &inferior_object_type);
 729
 730   infpy_inf_data_key =
 731     register_inferior_data_with_cleanup (py_free_inferior);
 732
 733   observer_attach_new_thread (add_thread_object);
 734   observer_attach_thread_exit (delete_thread_object);
 735   observer_attach_normal_stop (python_on_normal_stop);
 736   observer_attach_target_resumed (python_on_resume);
 737   observer_attach_inferior_exit (python_inferior_exit);
 738   observer_attach_new_objfile (python_new_objfile);
 739
 740   membuf_object_type.tp_new = PyType_GenericNew;
 741   if (PyType_Ready (&membuf_object_type) < 0)
 742     return;
 743
 744   Py_INCREF (&membuf_object_type);
 745   PyModule_AddObject (gdb_module, "Membuf", (PyObject *)
 746                       &membuf_object_type);
 747 }
 748
 749 static PyGetSetDef inferior_object_getset[] =
 750 {
 751   { "num", infpy_get_num, NULL, "ID of inferior, as assigned by GDB.", NULL },
 752   { "pid", infpy_get_pid, NULL, "PID of inferior, as assigned by the OS.",
 753     NULL },
 754   { "was_attached", infpy_get_was_attached, NULL,
 755     "True if the inferior was created using 'attach'.", NULL },
 756   { NULL }
 757 };
 758
 759 static PyMethodDef inferior_object_methods[] =
 760 {
 761   { "is_valid", infpy_is_valid, METH_NOARGS,
 762     "is_valid () -> Boolean.\n\
 763 Return true if this inferior is valid, false if not." },
 764   { "threads", infpy_threads, METH_NOARGS,
 765     "Return all the threads of this inferior." },
 766   { "read_memory", (PyCFunction) infpy_read_memory,
 767     METH_VARARGS | METH_KEYWORDS,
 768     "read_memory (address, length) -> buffer\n\
 769 Return a buffer object for reading from the inferior's memory." },
 770   { "write_memory", (PyCFunction) infpy_write_memory,
 771     METH_VARARGS | METH_KEYWORDS,
 772     "write_memory (address, buffer [, length])\n\
 773 Write the given buffer object to the inferior's memory." },
 774   { "search_memory", (PyCFunction) infpy_search_memory,
 775     METH_VARARGS | METH_KEYWORDS,
 776     "search_memory (address, length, pattern) -> long\n\
 777 Return a long with the address of a match, or None." },
 778   { NULL }
 779 };
 780
 781 static PyTypeObject inferior_object_type =
 782 {
 783   PyObject_HEAD_INIT (NULL)
 784   0,                              /* ob_size */
 785   "gdb.Inferior",                 /* tp_name */
 786   sizeof (inferior_object),       /* tp_basicsize */
 787   0,                              /* tp_itemsize */
 788   infpy_dealloc,                  /* tp_dealloc */
 789   0,                              /* tp_print */
 790   0,                              /* tp_getattr */
 791   0,                              /* tp_setattr */
 792   0,                              /* tp_compare */
 793   0,                              /* tp_repr */
 794   0,                              /* tp_as_number */
 795   0,                              /* tp_as_sequence */
 796   0,                              /* tp_as_mapping */
 797   0,                              /* tp_hash  */
 798   0,                              /* tp_call */
 799   0,                              /* tp_str */
 800   0,                              /* tp_getattro */
 801   0,                              /* tp_setattro */
 802   0,                              /* tp_as_buffer */
 803   Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_ITER,  /* tp_flags */
 804   "GDB inferior object",          /* tp_doc */
 805   0,                              /* tp_traverse */
 806   0,                              /* tp_clear */
 807   0,                              /* tp_richcompare */
 808   0,                              /* tp_weaklistoffset */
 809   0,                              /* tp_iter */
 810   0,                              /* tp_iternext */
 811   inferior_object_methods,        /* tp_methods */
 812   0,                              /* tp_members */
 813   inferior_object_getset,         /* tp_getset */
 814   0,                              /* tp_base */
 815   0,                              /* tp_dict */
 816   0,                              /* tp_descr_get */
 817   0,                              /* tp_descr_set */
 818   0,                              /* tp_dictoffset */
 819   0,                              /* tp_init */
 820   0                               /* tp_alloc */
 821 };
 822
 823 /* Python doesn't provide a decent way to get compatibility here.  */
 824 #if HAVE_LIBPYTHON2_4
 825 #define CHARBUFFERPROC_NAME getcharbufferproc
 826 #else
 827 #define CHARBUFFERPROC_NAME charbufferproc
 828 #endif
 829
 830 static PyBufferProcs buffer_procs = {
 831   get_read_buffer,
 832   get_write_buffer,
 833   get_seg_count,
 834   /* The cast here works around a difference between Python 2.4 and
 835      Python 2.5.  */
 836   (CHARBUFFERPROC_NAME) get_char_buffer
 837 };
 838
 839 static PyTypeObject membuf_object_type = {
 840   PyObject_HEAD_INIT (NULL)
 841   0,                              /*ob_size*/
 842   "gdb.Membuf",                   /*tp_name*/
 843   sizeof (membuf_object),         /*tp_basicsize*/
 844   0,                              /*tp_itemsize*/
 845   mbpy_dealloc,                   /*tp_dealloc*/
 846   0,                              /*tp_print*/
 847   0,                              /*tp_getattr*/
 848   0,                              /*tp_setattr*/
 849   0,                              /*tp_compare*/
 850   0,                              /*tp_repr*/
 851   0,                              /*tp_as_number*/
 852   0,                              /*tp_as_sequence*/
 853   0,                              /*tp_as_mapping*/
 854   0,                              /*tp_hash */
 855   0,                              /*tp_call*/
 856   mbpy_str,                       /*tp_str*/
 857   0,                              /*tp_getattro*/
 858   0,                              /*tp_setattro*/
 859   &buffer_procs,                  /*tp_as_buffer*/
 860   Py_TPFLAGS_DEFAULT,             /*tp_flags*/
 861   "GDB memory buffer object",     /*tp_doc*/
 862   0,                              /* tp_traverse */
 863   0,                              /* tp_clear */
 864   0,                              /* tp_richcompare */
 865   0,                              /* tp_weaklistoffset */
 866   0,                              /* tp_iter */
 867   0,                              /* tp_iternext */
 868   0,                              /* tp_methods */
 869   0,                              /* tp_members */
 870   0,                              /* tp_getset */
 871   0,                              /* tp_base */
 872   0,                              /* tp_dict */
 873   0,                              /* tp_descr_get */
 874   0,                              /* tp_descr_set */
 875   0,                              /* tp_dictoffset */
 876   0,                              /* tp_init */
 877   0,                              /* tp_alloc */
 878 };