gdb/python/py-infthread.c

   1 /* Python interface to inferior threads.
   2
   3    Copyright (C) 2009-2024 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 "gdbthread.h"
  21 #include "inferior.h"
  22 #include "python-internal.h"
  23
  24 extern PyTypeObject thread_object_type
  25     CPYCHECKER_TYPE_OBJECT_FOR_TYPEDEF ("thread_object");
  26
  27 /* Require that INFERIOR be a valid inferior ID.  */
  28 #define THPY_REQUIRE_VALID(Thread)                              \
  29   do {                                                          \
  30     if (!Thread->thread)                                        \
  31       {                                                         \
  32         PyErr_SetString (PyExc_RuntimeError,                    \
  33                          _("Thread no longer exists."));        \
  34         return NULL;                                            \
  35       }                                                         \
  36   } while (0)
  37
  38 gdbpy_ref<thread_object>
  39 create_thread_object (struct thread_info *tp)
  40 {
  41   gdbpy_ref<thread_object> thread_obj;
  42
  43   gdbpy_ref<inferior_object> inf_obj = inferior_to_inferior_object (tp->inf);
  44   if (inf_obj == NULL)
  45     return NULL;
  46
  47   thread_obj.reset (PyObject_New (thread_object, &thread_object_type));
  48   if (thread_obj == NULL)
  49     return NULL;
  50
  51   thread_obj->thread = tp;
  52   thread_obj->inf_obj = (PyObject *) inf_obj.release ();
  53   thread_obj->dict = PyDict_New ();
  54   if (thread_obj->dict == nullptr)
  55     return nullptr;
  56
  57   return thread_obj;
  58 }
  59
  60 static void
  61 thpy_dealloc (PyObject *self)
  62 {
  63   thread_object *thr_obj = (thread_object *) self;
  64
  65   gdb_assert (thr_obj->inf_obj != nullptr);
  66
  67   Py_DECREF (thr_obj->inf_obj);
  68   Py_XDECREF (thr_obj->dict);
  69
  70   Py_TYPE (self)->tp_free (self);
  71 }
  72
  73 static PyObject *
  74 thpy_get_name (PyObject *self, void *ignore)
  75 {
  76   thread_object *thread_obj = (thread_object *) self;
  77
  78   THPY_REQUIRE_VALID (thread_obj);
  79
  80   const char *name = thread_name (thread_obj->thread);
  81   if (name == NULL)
  82     Py_RETURN_NONE;
  83
  84   return PyUnicode_FromString (name);
  85 }
  86
  87 /* Return a string containing target specific additional information about
  88    the state of the thread, or None, if there is no such additional
  89    information.  */
  90
  91 static PyObject *
  92 thpy_get_details (PyObject *self, void *ignore)
  93 {
  94   thread_object *thread_obj = (thread_object *) self;
  95
  96   THPY_REQUIRE_VALID (thread_obj);
  97
  98   /* GCC can't tell that extra_info will always be assigned after the
  99      'catch', so initialize it.  */
 100   const char *extra_info = nullptr;
 101   try
 102     {
 103       extra_info = target_extra_thread_info (thread_obj->thread);
 104     }
 105   catch (const gdb_exception &except)
 106     {
 107       return gdbpy_handle_gdb_exception (nullptr, except);
 108     }
 109   if (extra_info == nullptr)
 110     Py_RETURN_NONE;
 111
 112   return PyUnicode_FromString (extra_info);
 113 }
 114
 115 static int
 116 thpy_set_name (PyObject *self, PyObject *newvalue, void *ignore)
 117 {
 118   thread_object *thread_obj = (thread_object *) self;
 119   gdb::unique_xmalloc_ptr<char> name;
 120
 121   if (! thread_obj->thread)
 122     {
 123       PyErr_SetString (PyExc_RuntimeError, _("Thread no longer exists."));
 124       return -1;
 125     }
 126
 127   if (newvalue == NULL)
 128     {
 129       PyErr_SetString (PyExc_TypeError,
 130                        _("Cannot delete `name' attribute."));
 131       return -1;
 132     }
 133   else if (newvalue == Py_None)
 134     {
 135       /* Nothing.  */
 136     }
 137   else if (! gdbpy_is_string (newvalue))
 138     {
 139       PyErr_SetString (PyExc_TypeError,
 140                        _("The value of `name' must be a string."));
 141       return -1;
 142     }
 143   else
 144     {
 145       name = python_string_to_host_string (newvalue);
 146       if (! name)
 147         return -1;
 148     }
 149
 150   thread_obj->thread->set_name (std::move (name));
 151
 152   return 0;
 153 }
 154
 155 /* Getter for InferiorThread.num.  */
 156
 157 static PyObject *
 158 thpy_get_num (PyObject *self, void *closure)
 159 {
 160   thread_object *thread_obj = (thread_object *) self;
 161
 162   THPY_REQUIRE_VALID (thread_obj);
 163
 164   gdbpy_ref<> result
 165     = gdb_py_object_from_longest (thread_obj->thread->per_inf_num);
 166   return result.release ();
 167 }
 168
 169 /* Getter for InferiorThread.global_num.  */
 170
 171 static PyObject *
 172 thpy_get_global_num (PyObject *self, void *closure)
 173 {
 174   thread_object *thread_obj = (thread_object *) self;
 175
 176   THPY_REQUIRE_VALID (thread_obj);
 177
 178   gdbpy_ref<> result
 179     = gdb_py_object_from_longest (thread_obj->thread->global_num);
 180   return result.release ();
 181 }
 182
 183 /* Getter for InferiorThread.ptid  -> (pid, lwp, tid).
 184    Returns a tuple with the thread's ptid components.  */
 185
 186 static PyObject *
 187 thpy_get_ptid (PyObject *self, void *closure)
 188 {
 189   thread_object *thread_obj = (thread_object *) self;
 190
 191   THPY_REQUIRE_VALID (thread_obj);
 192
 193   return gdbpy_create_ptid_object (thread_obj->thread->ptid);
 194 }
 195
 196 /* Implement gdb.InferiorThread.ptid_string attribute.  */
 197
 198 static PyObject *
 199 thpy_get_ptid_string (PyObject *self, void *closure)
 200 {
 201   thread_object *thread_obj = (thread_object *) self;
 202   THPY_REQUIRE_VALID (thread_obj);
 203   ptid_t ptid = thread_obj->thread->ptid;
 204
 205   try
 206     {
 207       /* Select the correct inferior before calling a target_* function.  */
 208       scoped_restore_current_thread restore_thread;
 209       switch_to_inferior_no_thread (thread_obj->thread->inf);
 210       std::string ptid_str = target_pid_to_str (ptid);
 211       return PyUnicode_FromString (ptid_str.c_str ());
 212     }
 213   catch (const gdb_exception &except)
 214     {
 215       return gdbpy_handle_gdb_exception (nullptr, except);
 216     }
 217 }
 218
 219 /* Getter for InferiorThread.inferior -> Inferior.  */
 220
 221 static PyObject *
 222 thpy_get_inferior (PyObject *self, void *ignore)
 223 {
 224   thread_object *thread_obj = (thread_object *) self;
 225
 226   THPY_REQUIRE_VALID (thread_obj);
 227   Py_INCREF (thread_obj->inf_obj);
 228
 229   return thread_obj->inf_obj;
 230 }
 231
 232 /* Implementation of InferiorThread.switch ().
 233    Makes this the GDB selected thread.  */
 234
 235 static PyObject *
 236 thpy_switch (PyObject *self, PyObject *args)
 237 {
 238   thread_object *thread_obj = (thread_object *) self;
 239
 240   THPY_REQUIRE_VALID (thread_obj);
 241
 242   try
 243     {
 244       switch_to_thread (thread_obj->thread);
 245     }
 246   catch (const gdb_exception &except)
 247     {
 248       return gdbpy_handle_gdb_exception (nullptr, except);
 249     }
 250
 251   Py_RETURN_NONE;
 252 }
 253
 254 /* Implementation of InferiorThread.is_stopped () -> Boolean.
 255    Return whether the thread is stopped.  */
 256
 257 static PyObject *
 258 thpy_is_stopped (PyObject *self, PyObject *args)
 259 {
 260   thread_object *thread_obj = (thread_object *) self;
 261
 262   THPY_REQUIRE_VALID (thread_obj);
 263
 264   if (thread_obj->thread->state == THREAD_STOPPED)
 265     Py_RETURN_TRUE;
 266
 267   Py_RETURN_FALSE;
 268 }
 269
 270 /* Implementation of InferiorThread.is_running () -> Boolean.
 271    Return whether the thread is running.  */
 272
 273 static PyObject *
 274 thpy_is_running (PyObject *self, PyObject *args)
 275 {
 276   thread_object *thread_obj = (thread_object *) self;
 277
 278   THPY_REQUIRE_VALID (thread_obj);
 279
 280   if (thread_obj->thread->state == THREAD_RUNNING)
 281     Py_RETURN_TRUE;
 282
 283   Py_RETURN_FALSE;
 284 }
 285
 286 /* Implementation of InferiorThread.is_exited () -> Boolean.
 287    Return whether the thread is exited.  */
 288
 289 static PyObject *
 290 thpy_is_exited (PyObject *self, PyObject *args)
 291 {
 292   thread_object *thread_obj = (thread_object *) self;
 293
 294   THPY_REQUIRE_VALID (thread_obj);
 295
 296   if (thread_obj->thread->state == THREAD_EXITED)
 297     Py_RETURN_TRUE;
 298
 299   Py_RETURN_FALSE;
 300 }
 301
 302 /* Implementation of gdb.InfThread.is_valid (self) -> Boolean.
 303    Returns True if this inferior Thread object still exists
 304    in GDB.  */
 305
 306 static PyObject *
 307 thpy_is_valid (PyObject *self, PyObject *args)
 308 {
 309   thread_object *thread_obj = (thread_object *) self;
 310
 311   if (! thread_obj->thread)
 312     Py_RETURN_FALSE;
 313
 314   Py_RETURN_TRUE;
 315 }
 316
 317 /* Implementation of gdb.InferiorThread.handle (self) -> handle. */
 318
 319 static PyObject *
 320 thpy_thread_handle (PyObject *self, PyObject *args)
 321 {
 322   thread_object *thread_obj = (thread_object *) self;
 323   THPY_REQUIRE_VALID (thread_obj);
 324
 325   gdb::array_view<const gdb_byte> hv;
 326
 327   try
 328     {
 329       hv = target_thread_info_to_thread_handle (thread_obj->thread);
 330     }
 331   catch (const gdb_exception &except)
 332     {
 333       return gdbpy_handle_gdb_exception (nullptr, except);
 334     }
 335
 336   if (hv.size () == 0)
 337     {
 338       PyErr_SetString (PyExc_RuntimeError, _("Thread handle not found."));
 339       return NULL;
 340     }
 341
 342   PyObject *object = PyBytes_FromStringAndSize ((const char *) hv.data (),
 343                                                 hv.size());
 344   return object;
 345 }
 346
 347 /* Implement repr() for gdb.InferiorThread.  */
 348
 349 static PyObject *
 350 thpy_repr (PyObject *self)
 351 {
 352   thread_object *thread_obj = (thread_object *) self;
 353
 354   if (thread_obj->thread == nullptr)
 355     return gdb_py_invalid_object_repr (self);
 356
 357   thread_info *thr = thread_obj->thread;
 358   return PyUnicode_FromFormat ("<%s id=%s target-id=\"%s\">",
 359                                Py_TYPE (self)->tp_name,
 360                                print_full_thread_id (thr),
 361                                target_pid_to_str (thr->ptid).c_str ());
 362 }
 363
 364 /* Return a reference to a new Python object representing a ptid_t.
 365    The object is a tuple containing (pid, lwp, tid). */
 366 PyObject *
 367 gdbpy_create_ptid_object (ptid_t ptid)
 368 {
 369   int pid;
 370   long lwp;
 371   ULONGEST tid;
 372   PyObject *ret;
 373
 374   ret = PyTuple_New (3);
 375   if (!ret)
 376     return NULL;
 377
 378   pid = ptid.pid ();
 379   lwp = ptid.lwp ();
 380   tid = ptid.tid ();
 381
 382   gdbpy_ref<> pid_obj = gdb_py_object_from_longest (pid);
 383   if (pid_obj == nullptr)
 384     return nullptr;
 385   gdbpy_ref<> lwp_obj = gdb_py_object_from_longest (lwp);
 386   if (lwp_obj == nullptr)
 387     return nullptr;
 388   gdbpy_ref<> tid_obj = gdb_py_object_from_ulongest (tid);
 389   if (tid_obj == nullptr)
 390     return nullptr;
 391
 392   /* Note that these steal references, hence the use of 'release'.  */
 393   PyTuple_SET_ITEM (ret, 0, pid_obj.release ());
 394   PyTuple_SET_ITEM (ret, 1, lwp_obj.release ());
 395   PyTuple_SET_ITEM (ret, 2, tid_obj.release ());
 396
 397   return ret;
 398 }
 399
 400 /* Implementation of gdb.selected_thread () -> gdb.InferiorThread.
 401    Returns the selected thread object.  */
 402
 403 PyObject *
 404 gdbpy_selected_thread (PyObject *self, PyObject *args)
 405 {
 406   if (inferior_ptid != null_ptid)
 407     return thread_to_thread_object (inferior_thread ()).release ();
 408
 409   Py_RETURN_NONE;
 410 }
 411
 412 static int CPYCHECKER_NEGATIVE_RESULT_SETS_EXCEPTION
 413 gdbpy_initialize_thread (void)
 414 {
 415   return gdbpy_type_ready (&thread_object_type);
 416 }
 417
 418 GDBPY_INITIALIZE_FILE (gdbpy_initialize_thread);
 419
 420 \f
 421
 422 static gdb_PyGetSetDef thread_object_getset[] =
 423 {
 424   { "__dict__", gdb_py_generic_dict, nullptr,
 425     "The __dict__ for this thread.", &thread_object_type },
 426   { "name", thpy_get_name, thpy_set_name,
 427     "The name of the thread, as set by the user or the OS.", NULL },
 428   { "details", thpy_get_details, NULL,
 429     "A target specific string containing extra thread state details.",
 430     NULL },
 431   { "num", thpy_get_num, NULL,
 432     "Per-inferior number of the thread, as assigned by GDB.", NULL },
 433   { "global_num", thpy_get_global_num, NULL,
 434     "Global number of the thread, as assigned by GDB.", NULL },
 435   { "ptid", thpy_get_ptid, NULL, "ID of the thread, as assigned by the OS.",
 436     NULL },
 437   { "ptid_string", thpy_get_ptid_string, nullptr,
 438     "A string representing ptid, as used by, for example, 'info threads'.",
 439     nullptr },
 440   { "inferior", thpy_get_inferior, NULL,
 441     "The Inferior object this thread belongs to.", NULL },
 442
 443   { NULL }
 444 };
 445
 446 static PyMethodDef thread_object_methods[] =
 447 {
 448   { "is_valid", thpy_is_valid, METH_NOARGS,
 449     "is_valid () -> Boolean.\n\
 450 Return true if this inferior thread is valid, false if not." },
 451   { "switch", thpy_switch, METH_NOARGS,
 452     "switch ()\n\
 453 Makes this the GDB selected thread." },
 454   { "is_stopped", thpy_is_stopped, METH_NOARGS,
 455     "is_stopped () -> Boolean\n\
 456 Return whether the thread is stopped." },
 457   { "is_running", thpy_is_running, METH_NOARGS,
 458     "is_running () -> Boolean\n\
 459 Return whether the thread is running." },
 460   { "is_exited", thpy_is_exited, METH_NOARGS,
 461     "is_exited () -> Boolean\n\
 462 Return whether the thread is exited." },
 463   { "handle", thpy_thread_handle, METH_NOARGS,
 464     "handle  () -> handle\n\
 465 Return thread library specific handle for thread." },
 466
 467   { NULL }
 468 };
 469
 470 PyTypeObject thread_object_type =
 471 {
 472   PyVarObject_HEAD_INIT (NULL, 0)
 473   "gdb.InferiorThread",           /*tp_name*/
 474   sizeof (thread_object),         /*tp_basicsize*/
 475   0,                              /*tp_itemsize*/
 476   thpy_dealloc,                   /*tp_dealloc*/
 477   0,                              /*tp_print*/
 478   0,                              /*tp_getattr*/
 479   0,                              /*tp_setattr*/
 480   0,                              /*tp_compare*/
 481   thpy_repr,                      /*tp_repr*/
 482   0,                              /*tp_as_number*/
 483   0,                              /*tp_as_sequence*/
 484   0,                              /*tp_as_mapping*/
 485   0,                              /*tp_hash */
 486   0,                              /*tp_call*/
 487   0,                              /*tp_str*/
 488   0,                              /*tp_getattro*/
 489   0,                              /*tp_setattro*/
 490   0,                              /*tp_as_buffer*/
 491   Py_TPFLAGS_DEFAULT,             /*tp_flags*/
 492   "GDB thread object",            /* tp_doc */
 493   0,                              /* tp_traverse */
 494   0,                              /* tp_clear */
 495   0,                              /* tp_richcompare */
 496   0,                              /* tp_weaklistoffset */
 497   0,                              /* tp_iter */
 498   0,                              /* tp_iternext */
 499   thread_object_methods,          /* tp_methods */
 500   0,                              /* tp_members */
 501   thread_object_getset,           /* tp_getset */
 502   0,                              /* tp_base */
 503   0,                              /* tp_dict */
 504   0,                              /* tp_descr_get */
 505   0,                              /* tp_descr_set */
 506   offsetof (thread_object, dict), /* tp_dictoffset */
 507   0,                              /* tp_init */
 508   0                               /* tp_alloc */
 509 };