gdb/python/py-record-btrace.c

   1 /* Python interface to btrace instruction history.
   2
   3    Copyright 2016-2017 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 "gdbcore.h"
  22 #include "gdbcmd.h"
  23 #include "gdbthread.h"
  24 #include "btrace.h"
  25 #include "py-record.h"
  26 #include "py-record-btrace.h"
  27 #include "disasm.h"
  28
  29 #if defined (IS_PY3K)
  30
  31 #define BTPY_PYSLICE(x) (x)
  32
  33 #else
  34
  35 #define BTPY_PYSLICE(x) ((PySliceObject *) x)
  36
  37 #endif
  38
  39 /* Python object for btrace record lists.  */
  40
  41 typedef struct {
  42   PyObject_HEAD
  43
  44   /* The thread this list belongs to.  */
  45   ptid_t ptid;
  46
  47   /* The first index being part of this list.  */
  48   Py_ssize_t first;
  49
  50   /* The last index begin part of this list.  */
  51   Py_ssize_t last;
  52
  53   /* Stride size.  */
  54   Py_ssize_t step;
  55
  56   /* Either &BTPY_CALL_TYPE or &RECPY_INSN_TYPE.  */
  57   PyTypeObject* element_type;
  58 } btpy_list_object;
  59
  60 /* Python type for btrace lists.  */
  61
  62 static PyTypeObject btpy_list_type = {
  63   PyVarObject_HEAD_INIT (NULL, 0)
  64 };
  65
  66 /* Returns either a btrace_insn for the given Python gdb.RecordInstruction
  67    object or sets an appropriate Python exception and returns NULL.  */
  68
  69 static const btrace_insn *
  70 btrace_insn_from_recpy_insn (const PyObject * const pyobject)
  71 {
  72   const btrace_insn *insn;
  73   const recpy_element_object *obj;
  74   thread_info *tinfo;
  75   btrace_insn_iterator iter;
  76
  77   if (Py_TYPE (pyobject) != &recpy_insn_type)
  78     {
  79       PyErr_Format (gdbpy_gdb_error, _("Must be gdb.RecordInstruction"));
  80       return NULL;
  81     }
  82
  83   obj = (const recpy_element_object *) pyobject;
  84   tinfo = find_thread_ptid (obj->ptid);
  85
  86   if (tinfo == NULL || btrace_is_empty (tinfo))
  87     {
  88       PyErr_Format (gdbpy_gdb_error, _("No such instruction."));
  89       return NULL;
  90     }
  91
  92   if (btrace_find_insn_by_number (&iter, &tinfo->btrace, obj->number) == 0)
  93     {
  94       PyErr_Format (gdbpy_gdb_error, _("No such instruction."));
  95       return NULL;
  96     }
  97
  98   insn = btrace_insn_get (&iter);
  99   if (insn == NULL)
 100     {
 101       PyErr_Format (gdbpy_gdb_error, _("Not a valid instruction."));
 102       return NULL;
 103     }
 104
 105   return insn;
 106 }
 107
 108 /* Returns either a btrace_function for the given Python
 109    gdb.RecordFunctionSegment object or sets an appropriate Python exception and
 110    returns NULL.  */
 111
 112 static const btrace_function *
 113 btrace_func_from_recpy_func (const PyObject * const pyobject)
 114 {
 115   const btrace_function *func;
 116   const recpy_element_object *obj;
 117   thread_info *tinfo;
 118   btrace_call_iterator iter;
 119
 120   if (Py_TYPE (pyobject) != &recpy_func_type)
 121     {
 122       PyErr_Format (gdbpy_gdb_error, _("Must be gdb.RecordFunctionSegment"));
 123       return NULL;
 124     }
 125
 126   obj = (const recpy_element_object *) pyobject;
 127   tinfo = find_thread_ptid (obj->ptid);
 128
 129   if (tinfo == NULL || btrace_is_empty (tinfo))
 130     {
 131       PyErr_Format (gdbpy_gdb_error, _("No such function segment."));
 132       return NULL;
 133     }
 134
 135   if (btrace_find_call_by_number (&iter, &tinfo->btrace, obj->number) == 0)
 136     {
 137       PyErr_Format (gdbpy_gdb_error, _("No such function segment."));
 138       return NULL;
 139     }
 140
 141   func = btrace_call_get (&iter);
 142   if (func == NULL)
 143     {
 144       PyErr_Format (gdbpy_gdb_error, _("Not a valid function segment."));
 145       return NULL;
 146     }
 147
 148   return func;
 149 }
 150
 151 /* Looks at the recorded item with the number NUMBER and create a
 152    gdb.RecordInstruction or gdb.RecordGap object for it accordingly.  */
 153
 154 static PyObject *
 155 btpy_insn_or_gap_new (const thread_info *tinfo, Py_ssize_t number)
 156 {
 157   btrace_insn_iterator iter;
 158   int err_code;
 159
 160   btrace_find_insn_by_number (&iter, &tinfo->btrace, number);
 161   err_code = btrace_insn_get_error (&iter);
 162
 163   if (err_code != 0)
 164     {
 165       const btrace_config *config;
 166       const char *err_string;
 167
 168       config = btrace_conf (&tinfo->btrace);
 169       err_string = btrace_decode_error (config->format, err_code);
 170
 171       return recpy_gap_new (err_code, err_string, number);
 172     }
 173
 174   return recpy_insn_new (tinfo->ptid, RECORD_METHOD_BTRACE, number);
 175 }
 176
 177 /* Create a new gdb.BtraceList object.  */
 178
 179 static PyObject *
 180 btpy_list_new (ptid_t ptid, Py_ssize_t first, Py_ssize_t last, Py_ssize_t step,
 181                PyTypeObject *element_type)
 182 {
 183   btpy_list_object * const obj = PyObject_New (btpy_list_object,
 184                                                &btpy_list_type);
 185
 186   if (obj == NULL)
 187     return NULL;
 188
 189   obj->ptid = ptid;
 190   obj->first = first;
 191   obj->last = last;
 192   obj->step = step;
 193   obj->element_type = element_type;
 194
 195   return (PyObject *) obj;
 196 }
 197
 198 /* Implementation of RecordInstruction.sal [gdb.Symtab_and_line] for btrace.
 199    Returns the SAL associated with this instruction.  */
 200
 201 PyObject *
 202 recpy_bt_insn_sal (PyObject *self, void *closure)
 203 {
 204   const btrace_insn * const insn = btrace_insn_from_recpy_insn (self);
 205   PyObject *result = NULL;
 206
 207   if (insn == NULL)
 208     return NULL;
 209
 210   TRY
 211     {
 212       result = symtab_and_line_to_sal_object (find_pc_line (insn->pc, 0));
 213     }
 214   CATCH (except, RETURN_MASK_ALL)
 215     {
 216       GDB_PY_HANDLE_EXCEPTION (except);
 217     }
 218   END_CATCH
 219
 220   return result;
 221 }
 222
 223 /* Implementation of RecordInstruction.pc [int] for btrace.
 224    Returns the instruction address.  */
 225
 226 PyObject *
 227 recpy_bt_insn_pc (PyObject *self, void *closure)
 228 {
 229   const btrace_insn * const insn = btrace_insn_from_recpy_insn (self);
 230
 231   if (insn == NULL)
 232     return NULL;
 233
 234   return gdb_py_long_from_ulongest (insn->pc);
 235 }
 236
 237 /* Implementation of RecordInstruction.size [int] for btrace.
 238    Returns the instruction size.  */
 239
 240 PyObject *
 241 recpy_bt_insn_size (PyObject *self, void *closure)
 242 {
 243   const btrace_insn * const insn = btrace_insn_from_recpy_insn (self);
 244
 245   if (insn == NULL)
 246     return NULL;
 247
 248   return PyInt_FromLong (insn->size);
 249 }
 250
 251 /* Implementation of RecordInstruction.is_speculative [bool] for btrace.
 252    Returns if this instruction was executed speculatively.  */
 253
 254 PyObject *
 255 recpy_bt_insn_is_speculative (PyObject *self, void *closure)
 256 {
 257   const btrace_insn * const insn = btrace_insn_from_recpy_insn (self);
 258
 259   if (insn == NULL)
 260     return NULL;
 261
 262   if (insn->flags & BTRACE_INSN_FLAG_SPECULATIVE)
 263     Py_RETURN_TRUE;
 264   else
 265     Py_RETURN_FALSE;
 266 }
 267
 268 /* Implementation of RecordInstruction.data [buffer] for btrace.
 269    Returns raw instruction data.  */
 270
 271 PyObject *
 272 recpy_bt_insn_data (PyObject *self, void *closure)
 273 {
 274   const btrace_insn * const insn = btrace_insn_from_recpy_insn (self);
 275   gdb_byte *buffer = NULL;
 276   PyObject *object;
 277
 278   if (insn == NULL)
 279     return NULL;
 280
 281   TRY
 282     {
 283       buffer = (gdb_byte *) xmalloc (insn->size);
 284       read_memory (insn->pc, buffer, insn->size);
 285     }
 286   CATCH (except, RETURN_MASK_ALL)
 287     {
 288       xfree (buffer);
 289       GDB_PY_HANDLE_EXCEPTION (except);
 290     }
 291   END_CATCH
 292
 293   object = PyBytes_FromStringAndSize ((const char*) buffer, insn->size);
 294   xfree (buffer);
 295
 296   if (object == NULL)
 297     return NULL;
 298
 299 #ifdef IS_PY3K
 300   return PyMemoryView_FromObject (object);
 301 #else
 302   return PyBuffer_FromObject (object, 0, Py_END_OF_BUFFER);
 303 #endif
 304
 305 }
 306
 307 /* Implementation of RecordInstruction.decoded [str] for btrace.
 308    Returns the instruction as human readable string.  */
 309
 310 PyObject *
 311 recpy_bt_insn_decoded (PyObject *self, void *closure)
 312 {
 313   const btrace_insn * const insn = btrace_insn_from_recpy_insn (self);
 314   string_file strfile;
 315
 316   if (insn == NULL)
 317     return NULL;
 318
 319   TRY
 320     {
 321       gdb_print_insn (target_gdbarch (), insn->pc, &strfile, NULL);
 322     }
 323   CATCH (except, RETURN_MASK_ALL)
 324     {
 325       gdbpy_convert_exception (except);
 326       return NULL;
 327     }
 328   END_CATCH
 329
 330
 331   return PyBytes_FromString (strfile.string ().c_str ());
 332 }
 333
 334 /* Implementation of RecordFunctionSegment.level [int] for btrace.
 335    Returns the call level.  */
 336
 337 PyObject *
 338 recpy_bt_func_level (PyObject *self, void *closure)
 339 {
 340   const btrace_function * const func = btrace_func_from_recpy_func (self);
 341   thread_info *tinfo;
 342
 343   if (func == NULL)
 344     return NULL;
 345
 346   tinfo = find_thread_ptid (((recpy_element_object *) self)->ptid);
 347   return PyInt_FromLong (tinfo->btrace.level + func->level);
 348 }
 349
 350 /* Implementation of RecordFunctionSegment.symbol [gdb.Symbol] for btrace.
 351    Returns the symbol associated with this function call.  */
 352
 353 PyObject *
 354 recpy_bt_func_symbol (PyObject *self, void *closure)
 355 {
 356   const btrace_function * const func = btrace_func_from_recpy_func (self);
 357
 358   if (func == NULL)
 359     return NULL;
 360
 361   if (func->sym == NULL)
 362     Py_RETURN_NONE;
 363
 364   return symbol_to_symbol_object (func->sym);
 365 }
 366
 367 /* Implementation of RecordFunctionSegment.instructions [list] for btrace.
 368    Returns the list of instructions that belong to this function call.  */
 369
 370 PyObject *
 371 recpy_bt_func_instructions (PyObject *self, void *closure)
 372 {
 373   const btrace_function * const func = btrace_func_from_recpy_func (self);
 374   unsigned int len;
 375
 376   if (func == NULL)
 377     return NULL;
 378
 379   len = func->insn.size ();
 380
 381   /* Gaps count as one instruction.  */
 382   if (len == 0)
 383     len = 1;
 384
 385   return btpy_list_new (((recpy_element_object *) self)->ptid,
 386                         func->insn_offset, func->insn_offset + len, 1,
 387                         &recpy_insn_type);
 388 }
 389
 390 /* Implementation of RecordFunctionSegment.up [RecordFunctionSegment] for
 391    btrace.  Returns the caller / returnee of this function.  */
 392
 393 PyObject *
 394 recpy_bt_func_up (PyObject *self, void *closure)
 395 {
 396   const btrace_function * const func = btrace_func_from_recpy_func (self);
 397
 398   if (func == NULL)
 399     return NULL;
 400
 401   if (func->up == 0)
 402     Py_RETURN_NONE;
 403
 404   return recpy_func_new (((recpy_element_object *) self)->ptid,
 405                          RECORD_METHOD_BTRACE, func->up);
 406 }
 407
 408 /* Implementation of RecordFunctionSegment.prev [RecordFunctionSegment] for
 409    btrace.  Returns a previous segment of this function.  */
 410
 411 PyObject *
 412 recpy_bt_func_prev (PyObject *self, void *closure)
 413 {
 414   const btrace_function * const func = btrace_func_from_recpy_func (self);
 415
 416   if (func == NULL)
 417     return NULL;
 418
 419   if (func->prev == 0)
 420     Py_RETURN_NONE;
 421
 422   return recpy_func_new (((recpy_element_object *) self)->ptid,
 423                          RECORD_METHOD_BTRACE, func->prev);
 424 }
 425
 426 /* Implementation of RecordFunctionSegment.next [RecordFunctionSegment] for
 427    btrace.  Returns a following segment of this function.  */
 428
 429 PyObject *
 430 recpy_bt_func_next (PyObject *self, void *closure)
 431 {
 432   const btrace_function * const func = btrace_func_from_recpy_func (self);
 433
 434   if (func == NULL)
 435     return NULL;
 436
 437   if (func->next == 0)
 438     Py_RETURN_NONE;
 439
 440   return recpy_func_new (((recpy_element_object *) self)->ptid,
 441                          RECORD_METHOD_BTRACE, func->next);
 442 }
 443
 444 /* Implementation of BtraceList.__len__ (self) -> int.  */
 445
 446 static Py_ssize_t
 447 btpy_list_length (PyObject *self)
 448 {
 449   const btpy_list_object * const obj = (btpy_list_object *) self;
 450   const Py_ssize_t distance = obj->last - obj->first;
 451   const Py_ssize_t result = distance / obj->step;
 452
 453   if ((distance % obj->step) == 0)
 454     return result;
 455
 456   return result + 1;
 457 }
 458
 459 /* Implementation of
 460    BtraceList.__getitem__ (self, key) -> BtraceInstruction and
 461    BtraceList.__getitem__ (self, key) -> BtraceFunctionCall.  */
 462
 463 static PyObject *
 464 btpy_list_item (PyObject *self, Py_ssize_t index)
 465 {
 466   const btpy_list_object * const obj = (btpy_list_object *) self;
 467   struct thread_info * const tinfo = find_thread_ptid (obj->ptid);
 468   Py_ssize_t number;
 469
 470   if (index < 0 || index >= btpy_list_length (self))
 471     return PyErr_Format (PyExc_IndexError, _("Index out of range: %zd."),
 472                          index);
 473
 474   number = obj->first + (obj->step * index);
 475
 476   if (obj->element_type == &recpy_insn_type)
 477     return recpy_insn_new (obj->ptid, RECORD_METHOD_BTRACE, number);
 478   else
 479     return recpy_func_new (obj->ptid, RECORD_METHOD_BTRACE, number);
 480 }
 481
 482 /* Implementation of BtraceList.__getitem__ (self, slice) -> BtraceList.  */
 483
 484 static PyObject *
 485 btpy_list_slice (PyObject *self, PyObject *value)
 486 {
 487   const btpy_list_object * const obj = (btpy_list_object *) self;
 488   const Py_ssize_t length = btpy_list_length (self);
 489   Py_ssize_t start, stop, step, slicelength;
 490
 491   if (PyInt_Check (value))
 492     {
 493       Py_ssize_t index = PyInt_AsSsize_t (value);
 494
 495       /* Emulate Python behavior for negative indices.  */
 496       if (index < 0)
 497         index += length;
 498
 499       return btpy_list_item (self, index);
 500     }
 501
 502   if (!PySlice_Check (value))
 503     return PyErr_Format (PyExc_TypeError, _("Index must be int or slice."));
 504
 505   if (0 != PySlice_GetIndicesEx (BTPY_PYSLICE (value), length, &start, &stop,
 506                                  &step, &slicelength))
 507     return NULL;
 508
 509   return btpy_list_new (obj->ptid, obj->first + obj->step * start,
 510                         obj->first + obj->step * stop, obj->step * step,
 511                         obj->element_type);
 512 }
 513
 514 /* Helper function that returns the position of an element in a BtraceList
 515    or -1 if the element is not in the list.  */
 516
 517 static LONGEST
 518 btpy_list_position (PyObject *self, PyObject *value)
 519 {
 520   const btpy_list_object * const list_obj = (btpy_list_object *) self;
 521   const recpy_element_object * const obj = (const recpy_element_object *) value;
 522   Py_ssize_t index = obj->number;
 523
 524   if (list_obj->element_type != Py_TYPE (value))
 525     return -1;
 526
 527   if (!ptid_equal (list_obj->ptid, obj->ptid))
 528     return -1;
 529
 530   if (index < list_obj->first || index > list_obj->last)
 531     return -1;
 532
 533   index -= list_obj->first;
 534
 535   if (index % list_obj->step != 0)
 536     return -1;
 537
 538   return index / list_obj->step;
 539 }
 540
 541 /* Implementation of "in" operator for BtraceLists.  */
 542
 543 static int
 544 btpy_list_contains (PyObject *self, PyObject *value)
 545 {
 546   if (btpy_list_position (self, value) < 0)
 547     return 0;
 548
 549   return 1;
 550 }
 551
 552 /* Implementation of BtraceLists.index (self, value) -> int.  */
 553
 554 static PyObject *
 555 btpy_list_index (PyObject *self, PyObject *value)
 556 {
 557   const LONGEST index = btpy_list_position (self, value);
 558
 559   if (index < 0)
 560     return PyErr_Format (PyExc_ValueError, _("Not in list."));
 561
 562   return gdb_py_long_from_longest (index);
 563 }
 564
 565 /* Implementation of BtraceList.count (self, value) -> int.  */
 566
 567 static PyObject *
 568 btpy_list_count (PyObject *self, PyObject *value)
 569 {
 570   /* We know that if an element is in the list, it is so exactly one time,
 571      enabling us to reuse the "is element of" check.  */
 572   return PyInt_FromLong (btpy_list_contains (self, value));
 573 }
 574
 575 /* Python rich compare function to allow for equality and inequality checks
 576    in Python.  */
 577
 578 static PyObject *
 579 btpy_list_richcompare (PyObject *self, PyObject *other, int op)
 580 {
 581   const btpy_list_object * const obj1 = (btpy_list_object *) self;
 582   const btpy_list_object * const obj2 = (btpy_list_object *) other;
 583
 584   if (Py_TYPE (self) != Py_TYPE (other))
 585     {
 586       Py_INCREF (Py_NotImplemented);
 587       return Py_NotImplemented;
 588     }
 589
 590   switch (op)
 591   {
 592     case Py_EQ:
 593       if (ptid_equal (obj1->ptid, obj2->ptid)
 594           && obj1->element_type == obj2->element_type
 595           && obj1->first == obj2->first
 596           && obj1->last == obj2->last
 597           && obj1->step == obj2->step)
 598         Py_RETURN_TRUE;
 599       else
 600         Py_RETURN_FALSE;
 601
 602     case Py_NE:
 603       if (!ptid_equal (obj1->ptid, obj2->ptid)
 604           || obj1->element_type != obj2->element_type
 605           || obj1->first != obj2->first
 606           || obj1->last != obj2->last
 607           || obj1->step != obj2->step)
 608         Py_RETURN_TRUE;
 609       else
 610         Py_RETURN_FALSE;
 611
 612     default:
 613       break;
 614   }
 615
 616   Py_INCREF (Py_NotImplemented);
 617   return Py_NotImplemented;
 618 }
 619
 620 /* Implementation of
 621    BtraceRecord.method [str].  */
 622
 623 PyObject *
 624 recpy_bt_method (PyObject *self, void *closure)
 625 {
 626   return PyString_FromString ("btrace");
 627 }
 628
 629 /* Implementation of
 630    BtraceRecord.format [str].  */
 631
 632 PyObject *
 633 recpy_bt_format (PyObject *self, void *closure)
 634 {
 635   const recpy_record_object * const record = (recpy_record_object *) self;
 636   const struct thread_info * const tinfo = find_thread_ptid (record->ptid);
 637   const struct btrace_config * config;
 638
 639   if (tinfo == NULL)
 640     Py_RETURN_NONE;
 641
 642   config = btrace_conf (&tinfo->btrace);
 643
 644   if (config == NULL)
 645     Py_RETURN_NONE;
 646
 647   return PyString_FromString (btrace_format_short_string (config->format));
 648 }
 649
 650 /* Implementation of
 651    BtraceRecord.replay_position [BtraceInstruction].  */
 652
 653 PyObject *
 654 recpy_bt_replay_position (PyObject *self, void *closure)
 655 {
 656   const recpy_record_object * const record = (recpy_record_object *) self;
 657   const struct thread_info * const tinfo = find_thread_ptid (record->ptid);
 658
 659   if (tinfo == NULL)
 660     Py_RETURN_NONE;
 661
 662   if (tinfo->btrace.replay == NULL)
 663     Py_RETURN_NONE;
 664
 665   return btpy_insn_or_gap_new (tinfo,
 666                                btrace_insn_number (tinfo->btrace.replay));
 667 }
 668
 669 /* Implementation of
 670    BtraceRecord.begin [BtraceInstruction].  */
 671
 672 PyObject *
 673 recpy_bt_begin (PyObject *self, void *closure)
 674 {
 675   const recpy_record_object * const record = (recpy_record_object *) self;
 676   struct thread_info * const tinfo = find_thread_ptid (record->ptid);
 677   struct btrace_insn_iterator iterator;
 678
 679   if (tinfo == NULL)
 680     Py_RETURN_NONE;
 681
 682   btrace_fetch (tinfo);
 683
 684   if (btrace_is_empty (tinfo))
 685     Py_RETURN_NONE;
 686
 687   btrace_insn_begin (&iterator, &tinfo->btrace);
 688   return btpy_insn_or_gap_new (tinfo, btrace_insn_number (&iterator));
 689 }
 690
 691 /* Implementation of
 692    BtraceRecord.end [BtraceInstruction].  */
 693
 694 PyObject *
 695 recpy_bt_end (PyObject *self, void *closure)
 696 {
 697   const recpy_record_object * const record = (recpy_record_object *) self;
 698   struct thread_info * const tinfo = find_thread_ptid (record->ptid);
 699   struct btrace_insn_iterator iterator;
 700
 701   if (tinfo == NULL)
 702     Py_RETURN_NONE;
 703
 704   btrace_fetch (tinfo);
 705
 706   if (btrace_is_empty (tinfo))
 707     Py_RETURN_NONE;
 708
 709   btrace_insn_end (&iterator, &tinfo->btrace);
 710   return btpy_insn_or_gap_new (tinfo, btrace_insn_number (&iterator));
 711 }
 712
 713 /* Implementation of
 714    BtraceRecord.instruction_history [list].  */
 715
 716 PyObject *
 717 recpy_bt_instruction_history (PyObject *self, void *closure)
 718 {
 719   const recpy_record_object * const record = (recpy_record_object *) self;
 720   struct thread_info * const tinfo = find_thread_ptid (record->ptid);
 721   struct btrace_insn_iterator iterator;
 722   unsigned long first = 0;
 723   unsigned long last = 0;
 724
 725    if (tinfo == NULL)
 726      Py_RETURN_NONE;
 727
 728    btrace_fetch (tinfo);
 729
 730    if (btrace_is_empty (tinfo))
 731      Py_RETURN_NONE;
 732
 733    btrace_insn_begin (&iterator, &tinfo->btrace);
 734    first = btrace_insn_number (&iterator);
 735
 736    btrace_insn_end (&iterator, &tinfo->btrace);
 737    last = btrace_insn_number (&iterator);
 738
 739    return btpy_list_new (record->ptid, first, last, 1, &recpy_insn_type);
 740 }
 741
 742 /* Implementation of
 743    BtraceRecord.function_call_history [list].  */
 744
 745 PyObject *
 746 recpy_bt_function_call_history (PyObject *self, void *closure)
 747 {
 748   const recpy_record_object * const record = (recpy_record_object *) self;
 749   struct thread_info * const tinfo = find_thread_ptid (record->ptid);
 750   struct btrace_call_iterator iterator;
 751   unsigned long first = 0;
 752   unsigned long last = 0;
 753
 754   if (tinfo == NULL)
 755     Py_RETURN_NONE;
 756
 757   btrace_fetch (tinfo);
 758
 759   if (btrace_is_empty (tinfo))
 760     Py_RETURN_NONE;
 761
 762   btrace_call_begin (&iterator, &tinfo->btrace);
 763   first = btrace_call_number (&iterator);
 764
 765   btrace_call_end (&iterator, &tinfo->btrace);
 766   last = btrace_call_number (&iterator);
 767
 768   return btpy_list_new (record->ptid, first, last, 1, &recpy_func_type);
 769 }
 770
 771 /* Implementation of BtraceRecord.goto (self, BtraceInstruction) -> None.  */
 772
 773 PyObject *
 774 recpy_bt_goto (PyObject *self, PyObject *args)
 775 {
 776   const recpy_record_object * const record = (recpy_record_object *) self;
 777   struct thread_info * const tinfo = find_thread_ptid (record->ptid);
 778   const recpy_element_object *obj;
 779
 780   if (tinfo == NULL || btrace_is_empty (tinfo))
 781         return PyErr_Format (gdbpy_gdb_error, _("Empty branch trace."));
 782
 783   if (!PyArg_ParseTuple (args, "O", &obj))
 784     return NULL;
 785
 786   if (Py_TYPE (obj) != &recpy_insn_type)
 787     return PyErr_Format (PyExc_TypeError, _("Argument must be instruction."));
 788
 789   TRY
 790     {
 791       struct btrace_insn_iterator iter;
 792
 793       btrace_insn_end (&iter, &tinfo->btrace);
 794
 795       if (btrace_insn_number (&iter) == obj->number)
 796         target_goto_record_end ();
 797       else
 798         target_goto_record (obj->number);
 799     }
 800   CATCH (except, RETURN_MASK_ALL)
 801     {
 802       GDB_PY_HANDLE_EXCEPTION (except);
 803     }
 804   END_CATCH
 805
 806   Py_RETURN_NONE;
 807 }
 808
 809 /* BtraceList methods.  */
 810
 811 struct PyMethodDef btpy_list_methods[] =
 812 {
 813   { "count", btpy_list_count, METH_O, "count number of occurences"},
 814   { "index", btpy_list_index, METH_O, "index of entry"},
 815   {NULL}
 816 };
 817
 818 /* BtraceList sequence methods.  */
 819
 820 static PySequenceMethods btpy_list_sequence_methods =
 821 {
 822   NULL
 823 };
 824
 825 /* BtraceList mapping methods.  Necessary for slicing.  */
 826
 827 static PyMappingMethods btpy_list_mapping_methods =
 828 {
 829   NULL
 830 };
 831
 832 /* Sets up the btrace record API.  */
 833
 834 int
 835 gdbpy_initialize_btrace (void)
 836 {
 837   btpy_list_type.tp_new = PyType_GenericNew;
 838   btpy_list_type.tp_flags = Py_TPFLAGS_DEFAULT;
 839   btpy_list_type.tp_basicsize = sizeof (btpy_list_object);
 840   btpy_list_type.tp_name = "gdb.BtraceObjectList";
 841   btpy_list_type.tp_doc = "GDB btrace list object";
 842   btpy_list_type.tp_methods = btpy_list_methods;
 843   btpy_list_type.tp_as_sequence = &btpy_list_sequence_methods;
 844   btpy_list_type.tp_as_mapping = &btpy_list_mapping_methods;
 845   btpy_list_type.tp_richcompare = btpy_list_richcompare;
 846
 847   btpy_list_sequence_methods.sq_item = btpy_list_item;
 848   btpy_list_sequence_methods.sq_length = btpy_list_length;
 849   btpy_list_sequence_methods.sq_contains = btpy_list_contains;
 850
 851   btpy_list_mapping_methods.mp_subscript = btpy_list_slice;
 852
 853   return PyType_Ready (&btpy_list_type);
 854 }