gdb/python/py-infthread.c

   1 /* Python interface to inferior threads.
   2
   3    Copyright (C) 2009-2016 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   thread_obj = PyObject_New (thread_object, &thread_object_type);
  45   if (!thread_obj)
  46     return NULL;
  47
  48   thread_obj->thread = tp;
  49   thread_obj->inf_obj = find_inferior_object (ptid_get_pid (tp->ptid));
  50
  51   return thread_obj;
  52 }
  53
  54 static void
  55 thpy_dealloc (PyObject *self)
  56 {
  57   Py_DECREF (((thread_object *) self)->inf_obj);
  58   Py_TYPE (self)->tp_free (self);
  59 }
  60
  61 static PyObject *
  62 thpy_get_name (PyObject *self, void *ignore)
  63 {
  64   thread_object *thread_obj = (thread_object *) self;
  65   const char *name;
  66
  67   THPY_REQUIRE_VALID (thread_obj);
  68
  69   name = thread_obj->thread->name;
  70   if (name == NULL)
  71     name = target_thread_name (thread_obj->thread);
  72
  73   if (name == NULL)
  74     Py_RETURN_NONE;
  75
  76   return PyString_FromString (name);
  77 }
  78
  79 static int
  80 thpy_set_name (PyObject *self, PyObject *newvalue, void *ignore)
  81 {
  82   thread_object *thread_obj = (thread_object *) self;
  83   char *name;
  84
  85   if (! thread_obj->thread)
  86     {
  87       PyErr_SetString (PyExc_RuntimeError, _("Thread no longer exists."));
  88       return -1;
  89     }
  90
  91   if (newvalue == NULL)
  92     {
  93       PyErr_SetString (PyExc_TypeError,
  94                        _("Cannot delete `name' attribute."));
  95       return -1;
  96     }
  97   else if (newvalue == Py_None)
  98     name = NULL;
  99   else if (! gdbpy_is_string (newvalue))
 100     {
 101       PyErr_SetString (PyExc_TypeError,
 102                        _("The value of `name' must be a string."));
 103       return -1;
 104     }
 105   else
 106     {
 107       name = python_string_to_host_string (newvalue);
 108       if (! name)
 109         return -1;
 110     }
 111
 112   xfree (thread_obj->thread->name);
 113   thread_obj->thread->name = name;
 114
 115   return 0;
 116 }
 117
 118 /* Getter for InferiorThread.num.  */
 119
 120 static PyObject *
 121 thpy_get_num (PyObject *self, void *closure)
 122 {
 123   thread_object *thread_obj = (thread_object *) self;
 124
 125   THPY_REQUIRE_VALID (thread_obj);
 126
 127   return PyLong_FromLong (thread_obj->thread->per_inf_num);
 128 }
 129
 130 /* Getter for InferiorThread.ptid  -> (pid, lwp, tid).
 131    Returns a tuple with the thread's ptid components.  */
 132
 133 static PyObject *
 134 thpy_get_ptid (PyObject *self, void *closure)
 135 {
 136   int pid;
 137   long tid, lwp;
 138   thread_object *thread_obj = (thread_object *) self;
 139
 140   THPY_REQUIRE_VALID (thread_obj);
 141
 142   return gdbpy_create_ptid_object (thread_obj->thread->ptid);
 143 }
 144
 145 /* Getter for InferiorThread.inferior -> Inferior.  */
 146
 147 static PyObject *
 148 thpy_get_inferior (PyObject *self, void *ignore)
 149 {
 150   thread_object *thread_obj = (thread_object *) self;
 151
 152   THPY_REQUIRE_VALID (thread_obj);
 153
 154   return thread_obj->inf_obj;
 155 }
 156
 157 /* Implementation of InferiorThread.switch ().
 158    Makes this the GDB selected thread.  */
 159
 160 static PyObject *
 161 thpy_switch (PyObject *self, PyObject *args)
 162 {
 163   thread_object *thread_obj = (thread_object *) self;
 164
 165   THPY_REQUIRE_VALID (thread_obj);
 166
 167   TRY
 168     {
 169       switch_to_thread (thread_obj->thread->ptid);
 170     }
 171   CATCH (except, RETURN_MASK_ALL)
 172     {
 173       GDB_PY_HANDLE_EXCEPTION (except);
 174     }
 175   END_CATCH
 176
 177   Py_RETURN_NONE;
 178 }
 179
 180 /* Implementation of InferiorThread.is_stopped () -> Boolean.
 181    Return whether the thread is stopped.  */
 182
 183 static PyObject *
 184 thpy_is_stopped (PyObject *self, PyObject *args)
 185 {
 186   thread_object *thread_obj = (thread_object *) self;
 187
 188   THPY_REQUIRE_VALID (thread_obj);
 189
 190   if (is_stopped (thread_obj->thread->ptid))
 191     Py_RETURN_TRUE;
 192
 193   Py_RETURN_FALSE;
 194 }
 195
 196 /* Implementation of InferiorThread.is_running () -> Boolean.
 197    Return whether the thread is running.  */
 198
 199 static PyObject *
 200 thpy_is_running (PyObject *self, PyObject *args)
 201 {
 202   thread_object *thread_obj = (thread_object *) self;
 203
 204   THPY_REQUIRE_VALID (thread_obj);
 205
 206   if (is_running (thread_obj->thread->ptid))
 207     Py_RETURN_TRUE;
 208
 209   Py_RETURN_FALSE;
 210 }
 211
 212 /* Implementation of InferiorThread.is_exited () -> Boolean.
 213    Return whether the thread is exited.  */
 214
 215 static PyObject *
 216 thpy_is_exited (PyObject *self, PyObject *args)
 217 {
 218   thread_object *thread_obj = (thread_object *) self;
 219
 220   THPY_REQUIRE_VALID (thread_obj);
 221
 222   if (is_exited (thread_obj->thread->ptid))
 223     Py_RETURN_TRUE;
 224
 225   Py_RETURN_FALSE;
 226 }
 227
 228 /* Implementation of gdb.InfThread.is_valid (self) -> Boolean.
 229    Returns True if this inferior Thread object still exists
 230    in GDB.  */
 231
 232 static PyObject *
 233 thpy_is_valid (PyObject *self, PyObject *args)
 234 {
 235   thread_object *thread_obj = (thread_object *) self;
 236
 237   if (! thread_obj->thread)
 238     Py_RETURN_FALSE;
 239
 240   Py_RETURN_TRUE;
 241 }
 242
 243 /* Return a reference to a new Python object representing a ptid_t.
 244    The object is a tuple containing (pid, lwp, tid). */
 245 PyObject *
 246 gdbpy_create_ptid_object (ptid_t ptid)
 247 {
 248   int pid;
 249   long tid, lwp;
 250   PyObject *ret;
 251
 252   ret = PyTuple_New (3);
 253   if (!ret)
 254     return NULL;
 255
 256   pid = ptid_get_pid (ptid);
 257   lwp = ptid_get_lwp (ptid);
 258   tid = ptid_get_tid (ptid);
 259
 260   PyTuple_SET_ITEM (ret, 0, PyInt_FromLong (pid));
 261   PyTuple_SET_ITEM (ret, 1, PyInt_FromLong (lwp));
 262   PyTuple_SET_ITEM (ret, 2, PyInt_FromLong (tid));
 263
 264   return ret;
 265 }
 266
 267 /* Implementation of gdb.selected_thread () -> gdb.InferiorThread.
 268    Returns the selected thread object.  */
 269
 270 PyObject *
 271 gdbpy_selected_thread (PyObject *self, PyObject *args)
 272 {
 273   PyObject *thread_obj;
 274
 275   thread_obj = (PyObject *) find_thread_object (inferior_ptid);
 276   if (thread_obj)
 277     {
 278       Py_INCREF (thread_obj);
 279       return thread_obj;
 280     }
 281
 282   Py_RETURN_NONE;
 283 }
 284
 285 int
 286 gdbpy_initialize_thread (void)
 287 {
 288   if (PyType_Ready (&thread_object_type) < 0)
 289     return -1;
 290
 291   return gdb_pymodule_addobject (gdb_module, "InferiorThread",
 292                                  (PyObject *) &thread_object_type);
 293 }
 294
 295 static PyGetSetDef thread_object_getset[] =
 296 {
 297   { "name", thpy_get_name, thpy_set_name,
 298     "The name of the thread, as set by the user or the OS.", NULL },
 299   { "num", thpy_get_num, NULL,
 300     "Per-inferior number of the thread, as assigned by GDB.", NULL },
 301   { "ptid", thpy_get_ptid, NULL, "ID of the thread, as assigned by the OS.",
 302     NULL },
 303   { "inferior", thpy_get_inferior, NULL,
 304     "The Inferior object this thread belongs to.", NULL },
 305
 306   { NULL }
 307 };
 308
 309 static PyMethodDef thread_object_methods[] =
 310 {
 311   { "is_valid", thpy_is_valid, METH_NOARGS,
 312     "is_valid () -> Boolean.\n\
 313 Return true if this inferior thread is valid, false if not." },
 314   { "switch", thpy_switch, METH_NOARGS,
 315     "switch ()\n\
 316 Makes this the GDB selected thread." },
 317   { "is_stopped", thpy_is_stopped, METH_NOARGS,
 318     "is_stopped () -> Boolean\n\
 319 Return whether the thread is stopped." },
 320   { "is_running", thpy_is_running, METH_NOARGS,
 321     "is_running () -> Boolean\n\
 322 Return whether the thread is running." },
 323   { "is_exited", thpy_is_exited, METH_NOARGS,
 324     "is_exited () -> Boolean\n\
 325 Return whether the thread is exited." },
 326
 327   { NULL }
 328 };
 329
 330 PyTypeObject thread_object_type =
 331 {
 332   PyVarObject_HEAD_INIT (NULL, 0)
 333   "gdb.InferiorThread",           /*tp_name*/
 334   sizeof (thread_object),         /*tp_basicsize*/
 335   0,                              /*tp_itemsize*/
 336   thpy_dealloc,                   /*tp_dealloc*/
 337   0,                              /*tp_print*/
 338   0,                              /*tp_getattr*/
 339   0,                              /*tp_setattr*/
 340   0,                              /*tp_compare*/
 341   0,                              /*tp_repr*/
 342   0,                              /*tp_as_number*/
 343   0,                              /*tp_as_sequence*/
 344   0,                              /*tp_as_mapping*/
 345   0,                              /*tp_hash */
 346   0,                              /*tp_call*/
 347   0,                              /*tp_str*/
 348   0,                              /*tp_getattro*/
 349   0,                              /*tp_setattro*/
 350   0,                              /*tp_as_buffer*/
 351   Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_ITER,  /*tp_flags*/
 352   "GDB thread object",            /* tp_doc */
 353   0,                              /* tp_traverse */
 354   0,                              /* tp_clear */
 355   0,                              /* tp_richcompare */
 356   0,                              /* tp_weaklistoffset */
 357   0,                              /* tp_iter */
 358   0,                              /* tp_iternext */
 359   thread_object_methods,          /* tp_methods */
 360   0,                              /* tp_members */
 361   thread_object_getset,           /* tp_getset */
 362   0,                              /* tp_base */
 363   0,                              /* tp_dict */
 364   0,                              /* tp_descr_get */
 365   0,                              /* tp_descr_set */
 366   0,                              /* tp_dictoffset */
 367   0,                              /* tp_init */
 368   0                               /* tp_alloc */
 369 };