gdb/python/py-infthread.c

   1 /* Python interface to inferior threads.
   2
   3    Copyright (C) 2009-2019 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 "gdbthread.h"
  22 #include "inferior.h"
  23 #include "python-internal.h"
  24
  25 extern PyTypeObject thread_object_type
  26     CPYCHECKER_TYPE_OBJECT_FOR_TYPEDEF ("thread_object");
  27
  28 /* Require that INFERIOR be a valid inferior ID.  */
  29 #define THPY_REQUIRE_VALID(Thread)                              \
  30   do {                                                          \
  31     if (!Thread->thread)                                        \
  32       {                                                         \
  33         PyErr_SetString (PyExc_RuntimeError,                    \
  34                          _("Thread no longer exists."));        \
  35         return NULL;                                            \
  36       }                                                         \
  37   } while (0)
  38
  39 thread_object *
  40 create_thread_object (struct thread_info *tp)
  41 {
  42   thread_object *thread_obj;
  43
  44   gdbpy_ref<inferior_object> inf_obj = inferior_to_inferior_object (tp->inf);
  45   if (inf_obj == NULL)
  46     return NULL;
  47
  48   thread_obj = PyObject_New (thread_object, &thread_object_type);
  49   if (!thread_obj)
  50     return NULL;
  51
  52   thread_obj->thread = tp;
  53   thread_obj->inf_obj = (PyObject *) inf_obj.release ();
  54
  55   return thread_obj;
  56 }
  57
  58 static void
  59 thpy_dealloc (PyObject *self)
  60 {
  61   Py_DECREF (((thread_object *) self)->inf_obj);
  62   Py_TYPE (self)->tp_free (self);
  63 }
  64
  65 static PyObject *
  66 thpy_get_name (PyObject *self, void *ignore)
  67 {
  68   thread_object *thread_obj = (thread_object *) self;
  69   const char *name;
  70
  71   THPY_REQUIRE_VALID (thread_obj);
  72
  73   name = thread_obj->thread->name;
  74   if (name == NULL)
  75     name = target_thread_name (thread_obj->thread);
  76
  77   if (name == NULL)
  78     Py_RETURN_NONE;
  79
  80   return PyString_FromString (name);
  81 }
  82
  83 static int
  84 thpy_set_name (PyObject *self, PyObject *newvalue, void *ignore)
  85 {
  86   thread_object *thread_obj = (thread_object *) self;
  87   gdb::unique_xmalloc_ptr<char> name;
  88
  89   if (! thread_obj->thread)
  90     {
  91       PyErr_SetString (PyExc_RuntimeError, _("Thread no longer exists."));
  92       return -1;
  93     }
  94
  95   if (newvalue == NULL)
  96     {
  97       PyErr_SetString (PyExc_TypeError,
  98                        _("Cannot delete `name' attribute."));
  99       return -1;
 100     }
 101   else if (newvalue == Py_None)
 102     {
 103       /* Nothing.  */
 104     }
 105   else if (! gdbpy_is_string (newvalue))
 106     {
 107       PyErr_SetString (PyExc_TypeError,
 108                        _("The value of `name' must be a string."));
 109       return -1;
 110     }
 111   else
 112     {
 113       name = python_string_to_host_string (newvalue);
 114       if (! name)
 115         return -1;
 116     }
 117
 118   xfree (thread_obj->thread->name);
 119   thread_obj->thread->name = name.release ();
 120
 121   return 0;
 122 }
 123
 124 /* Getter for InferiorThread.num.  */
 125
 126 static PyObject *
 127 thpy_get_num (PyObject *self, void *closure)
 128 {
 129   thread_object *thread_obj = (thread_object *) self;
 130
 131   THPY_REQUIRE_VALID (thread_obj);
 132
 133   return PyLong_FromLong (thread_obj->thread->per_inf_num);
 134 }
 135
 136 /* Getter for InferiorThread.global_num.  */
 137
 138 static PyObject *
 139 thpy_get_global_num (PyObject *self, void *closure)
 140 {
 141   thread_object *thread_obj = (thread_object *) self;
 142
 143   THPY_REQUIRE_VALID (thread_obj);
 144
 145   return PyLong_FromLong (thread_obj->thread->global_num);
 146 }
 147
 148 /* Getter for InferiorThread.ptid  -> (pid, lwp, tid).
 149    Returns a tuple with the thread's ptid components.  */
 150
 151 static PyObject *
 152 thpy_get_ptid (PyObject *self, void *closure)
 153 {
 154   thread_object *thread_obj = (thread_object *) self;
 155
 156   THPY_REQUIRE_VALID (thread_obj);
 157
 158   return gdbpy_create_ptid_object (thread_obj->thread->ptid);
 159 }
 160
 161 /* Getter for InferiorThread.inferior -> Inferior.  */
 162
 163 static PyObject *
 164 thpy_get_inferior (PyObject *self, void *ignore)
 165 {
 166   thread_object *thread_obj = (thread_object *) self;
 167
 168   THPY_REQUIRE_VALID (thread_obj);
 169   Py_INCREF (thread_obj->inf_obj);
 170
 171   return thread_obj->inf_obj;
 172 }
 173
 174 /* Implementation of InferiorThread.switch ().
 175    Makes this the GDB selected thread.  */
 176
 177 static PyObject *
 178 thpy_switch (PyObject *self, PyObject *args)
 179 {
 180   thread_object *thread_obj = (thread_object *) self;
 181
 182   THPY_REQUIRE_VALID (thread_obj);
 183
 184   TRY
 185     {
 186       switch_to_thread (thread_obj->thread);
 187     }
 188   CATCH (except, RETURN_MASK_ALL)
 189     {
 190       GDB_PY_HANDLE_EXCEPTION (except);
 191     }
 192   END_CATCH
 193
 194   Py_RETURN_NONE;
 195 }
 196
 197 /* Implementation of InferiorThread.is_stopped () -> Boolean.
 198    Return whether the thread is stopped.  */
 199
 200 static PyObject *
 201 thpy_is_stopped (PyObject *self, PyObject *args)
 202 {
 203   thread_object *thread_obj = (thread_object *) self;
 204
 205   THPY_REQUIRE_VALID (thread_obj);
 206
 207   if (thread_obj->thread->state == THREAD_STOPPED)
 208     Py_RETURN_TRUE;
 209
 210   Py_RETURN_FALSE;
 211 }
 212
 213 /* Implementation of InferiorThread.is_running () -> Boolean.
 214    Return whether the thread is running.  */
 215
 216 static PyObject *
 217 thpy_is_running (PyObject *self, PyObject *args)
 218 {
 219   thread_object *thread_obj = (thread_object *) self;
 220
 221   THPY_REQUIRE_VALID (thread_obj);
 222
 223   if (thread_obj->thread->state == THREAD_RUNNING)
 224     Py_RETURN_TRUE;
 225
 226   Py_RETURN_FALSE;
 227 }
 228
 229 /* Implementation of InferiorThread.is_exited () -> Boolean.
 230    Return whether the thread is exited.  */
 231
 232 static PyObject *
 233 thpy_is_exited (PyObject *self, PyObject *args)
 234 {
 235   thread_object *thread_obj = (thread_object *) self;
 236
 237   THPY_REQUIRE_VALID (thread_obj);
 238
 239   if (thread_obj->thread->state == THREAD_EXITED)
 240     Py_RETURN_TRUE;
 241
 242   Py_RETURN_FALSE;
 243 }
 244
 245 /* Implementation of gdb.InfThread.is_valid (self) -> Boolean.
 246    Returns True if this inferior Thread object still exists
 247    in GDB.  */
 248
 249 static PyObject *
 250 thpy_is_valid (PyObject *self, PyObject *args)
 251 {
 252   thread_object *thread_obj = (thread_object *) self;
 253
 254   if (! thread_obj->thread)
 255     Py_RETURN_FALSE;
 256
 257   Py_RETURN_TRUE;
 258 }
 259
 260 /* Return a reference to a new Python object representing a ptid_t.
 261    The object is a tuple containing (pid, lwp, tid). */
 262 PyObject *
 263 gdbpy_create_ptid_object (ptid_t ptid)
 264 {
 265   int pid;
 266   long tid, lwp;
 267   PyObject *ret;
 268
 269   ret = PyTuple_New (3);
 270   if (!ret)
 271     return NULL;
 272
 273   pid = ptid.pid ();
 274   lwp = ptid.lwp ();
 275   tid = ptid.tid ();
 276
 277   PyTuple_SET_ITEM (ret, 0, PyInt_FromLong (pid));
 278   PyTuple_SET_ITEM (ret, 1, PyInt_FromLong (lwp));
 279   PyTuple_SET_ITEM (ret, 2, PyInt_FromLong (tid));
 280
 281   return ret;
 282 }
 283
 284 /* Implementation of gdb.selected_thread () -> gdb.InferiorThread.
 285    Returns the selected thread object.  */
 286
 287 PyObject *
 288 gdbpy_selected_thread (PyObject *self, PyObject *args)
 289 {
 290   if (inferior_ptid != null_ptid)
 291     return thread_to_thread_object (inferior_thread ()).release ();
 292
 293   Py_RETURN_NONE;
 294 }
 295
 296 int
 297 gdbpy_initialize_thread (void)
 298 {
 299   if (PyType_Ready (&thread_object_type) < 0)
 300     return -1;
 301
 302   return gdb_pymodule_addobject (gdb_module, "InferiorThread",
 303                                  (PyObject *) &thread_object_type);
 304 }
 305
 306 static gdb_PyGetSetDef thread_object_getset[] =
 307 {
 308   { "name", thpy_get_name, thpy_set_name,
 309     "The name of the thread, as set by the user or the OS.", NULL },
 310   { "num", thpy_get_num, NULL,
 311     "Per-inferior number of the thread, as assigned by GDB.", NULL },
 312   { "global_num", thpy_get_global_num, NULL,
 313     "Global number of the thread, as assigned by GDB.", NULL },
 314   { "ptid", thpy_get_ptid, NULL, "ID of the thread, as assigned by the OS.",
 315     NULL },
 316   { "inferior", thpy_get_inferior, NULL,
 317     "The Inferior object this thread belongs to.", NULL },
 318
 319   { NULL }
 320 };
 321
 322 static PyMethodDef thread_object_methods[] =
 323 {
 324   { "is_valid", thpy_is_valid, METH_NOARGS,
 325     "is_valid () -> Boolean.\n\
 326 Return true if this inferior thread is valid, false if not." },
 327   { "switch", thpy_switch, METH_NOARGS,
 328     "switch ()\n\
 329 Makes this the GDB selected thread." },
 330   { "is_stopped", thpy_is_stopped, METH_NOARGS,
 331     "is_stopped () -> Boolean\n\
 332 Return whether the thread is stopped." },
 333   { "is_running", thpy_is_running, METH_NOARGS,
 334     "is_running () -> Boolean\n\
 335 Return whether the thread is running." },
 336   { "is_exited", thpy_is_exited, METH_NOARGS,
 337     "is_exited () -> Boolean\n\
 338 Return whether the thread is exited." },
 339
 340   { NULL }
 341 };
 342
 343 PyTypeObject thread_object_type =
 344 {
 345   PyVarObject_HEAD_INIT (NULL, 0)
 346   "gdb.InferiorThread",           /*tp_name*/
 347   sizeof (thread_object),         /*tp_basicsize*/
 348   0,                              /*tp_itemsize*/
 349   thpy_dealloc,                   /*tp_dealloc*/
 350   0,                              /*tp_print*/
 351   0,                              /*tp_getattr*/
 352   0,                              /*tp_setattr*/
 353   0,                              /*tp_compare*/
 354   0,                              /*tp_repr*/
 355   0,                              /*tp_as_number*/
 356   0,                              /*tp_as_sequence*/
 357   0,                              /*tp_as_mapping*/
 358   0,                              /*tp_hash */
 359   0,                              /*tp_call*/
 360   0,                              /*tp_str*/
 361   0,                              /*tp_getattro*/
 362   0,                              /*tp_setattro*/
 363   0,                              /*tp_as_buffer*/
 364   Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_ITER,  /*tp_flags*/
 365   "GDB thread object",            /* tp_doc */
 366   0,                              /* tp_traverse */
 367   0,                              /* tp_clear */
 368   0,                              /* tp_richcompare */
 369   0,                              /* tp_weaklistoffset */
 370   0,                              /* tp_iter */
 371   0,                              /* tp_iternext */
 372   thread_object_methods,          /* tp_methods */
 373   0,                              /* tp_members */
 374   thread_object_getset,           /* tp_getset */
 375   0,                              /* tp_base */
 376   0,                              /* tp_dict */
 377   0,                              /* tp_descr_get */
 378   0,                              /* tp_descr_set */
 379   0,                              /* tp_dictoffset */
 380   0,                              /* tp_init */
 381   0                               /* tp_alloc */
 382 };