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[mc] Remote access to process name
[simgrid.git] / src / mc / mc_request.c
1 /* Copyright (c) 2008-2014. The SimGrid Team.
2  * All rights reserved.                                                     */
3
4 /* This program is free software; you can redistribute it and/or modify it
5  * under the terms of the license (GNU LGPL) which comes with this package. */
6
7 #include "mc_request.h"
8 #include "mc_safety.h"
9 #include "mc_private.h"
10 #include "mc_smx.h"
11
12 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_request, mc,
13                                 "Logging specific to MC (request)");
14
15 static char *pointer_to_string(void *pointer);
16 static char *buff_size_to_string(size_t size);
17
18 int MC_request_depend(smx_simcall_t r1, smx_simcall_t r2)
19 {
20   if (mc_reduce_kind == e_mc_reduce_none)
21     return TRUE;
22
23   if (r1->issuer == r2->issuer)
24     return FALSE;
25
26   /* Wait with timeout transitions are not considered by the independance theorem, thus we consider them as dependant with all other transitions */
27   if ((r1->call == SIMCALL_COMM_WAIT && simcall_comm_wait__get__timeout(r1) > 0)
28       || (r2->call == SIMCALL_COMM_WAIT
29           && simcall_comm_wait__get__timeout(r2) > 0))
30     return TRUE;
31
32   if (r1->call == SIMCALL_COMM_ISEND && r2->call == SIMCALL_COMM_IRECV)
33     return FALSE;
34
35   if (r1->call == SIMCALL_COMM_IRECV && r2->call == SIMCALL_COMM_ISEND)
36     return FALSE;
37
38   if ((r1->call == SIMCALL_COMM_ISEND || r1->call == SIMCALL_COMM_IRECV)
39       && r2->call == SIMCALL_COMM_WAIT) {
40
41     smx_rdv_t rdv =
42         r1->call ==
43         SIMCALL_COMM_ISEND ? simcall_comm_isend__get__rdv(r1) :
44         simcall_comm_irecv__get__rdv(r1);
45
46     // FIXME, remote access to comm object
47
48     if (rdv != simcall_comm_wait__get__comm(r2)->comm.rdv_cpy
49         && simcall_comm_wait__get__timeout(r2) <= 0)
50       return FALSE;
51
52     if ((r1->issuer != simcall_comm_wait__get__comm(r2)->comm.src_proc)
53         && (r1->issuer != simcall_comm_wait__get__comm(r2)->comm.dst_proc)
54         && simcall_comm_wait__get__timeout(r2) <= 0)
55       return FALSE;
56
57     if ((r1->call == SIMCALL_COMM_ISEND)
58         && (simcall_comm_wait__get__comm(r2)->comm.type == SIMIX_COMM_SEND)
59         && (simcall_comm_wait__get__comm(r2)->comm.src_buff !=
60             simcall_comm_isend__get__src_buff(r1))
61         && simcall_comm_wait__get__timeout(r2) <= 0)
62       return FALSE;
63
64     if ((r1->call == SIMCALL_COMM_IRECV)
65         && (simcall_comm_wait__get__comm(r2)->comm.type == SIMIX_COMM_RECEIVE)
66         && (simcall_comm_wait__get__comm(r2)->comm.dst_buff !=
67             simcall_comm_irecv__get__dst_buff(r1))
68         && simcall_comm_wait__get__timeout(r2) <= 0)
69       return FALSE;
70   }
71
72   if ((r2->call == SIMCALL_COMM_ISEND || r2->call == SIMCALL_COMM_IRECV)
73       && r1->call == SIMCALL_COMM_WAIT) {
74
75     smx_rdv_t rdv =
76         r2->call ==
77         SIMCALL_COMM_ISEND ? simcall_comm_isend__get__rdv(r2) :
78         simcall_comm_irecv__get__rdv(r2);
79
80     if (rdv != simcall_comm_wait__get__comm(r1)->comm.rdv_cpy
81         && simcall_comm_wait__get__timeout(r1) <= 0)
82       return FALSE;
83
84     if ((r2->issuer != simcall_comm_wait__get__comm(r1)->comm.src_proc)
85         && (r2->issuer != simcall_comm_wait__get__comm(r1)->comm.dst_proc)
86         && simcall_comm_wait__get__timeout(r1) <= 0)
87       return FALSE;
88
89     if ((r2->call == SIMCALL_COMM_ISEND)
90         && (simcall_comm_wait__get__comm(r1)->comm.type == SIMIX_COMM_SEND)
91         && (simcall_comm_wait__get__comm(r1)->comm.src_buff !=
92             simcall_comm_isend__get__src_buff(r2))
93         && simcall_comm_wait__get__timeout(r1) <= 0)
94       return FALSE;
95
96     if ((r2->call == SIMCALL_COMM_IRECV)
97         && (simcall_comm_wait__get__comm(r1)->comm.type == SIMIX_COMM_RECEIVE)
98         && (simcall_comm_wait__get__comm(r1)->comm.dst_buff !=
99             simcall_comm_irecv__get__dst_buff(r2))
100         && simcall_comm_wait__get__timeout(r1) <= 0)
101       return FALSE;
102   }
103
104   /* FIXME: the following rule assumes that the result of the
105    * isend/irecv call is not stored in a buffer used in the
106    * test call. */
107   /*if(   (r1->call == SIMCALL_COMM_ISEND || r1->call == SIMCALL_COMM_IRECV)
108      &&  r2->call == SIMCALL_COMM_TEST)
109      return FALSE; */
110
111   /* FIXME: the following rule assumes that the result of the
112    * isend/irecv call is not stored in a buffer used in the
113    * test call.*/
114   /*if(   (r2->call == SIMCALL_COMM_ISEND || r2->call == SIMCALL_COMM_IRECV)
115      && r1->call == SIMCALL_COMM_TEST)
116      return FALSE; */
117
118   if (r1->call == SIMCALL_COMM_ISEND && r2->call == SIMCALL_COMM_ISEND
119       && simcall_comm_isend__get__rdv(r1) != simcall_comm_isend__get__rdv(r2))
120     return FALSE;
121
122   if (r1->call == SIMCALL_COMM_IRECV && r2->call == SIMCALL_COMM_IRECV
123       && simcall_comm_irecv__get__rdv(r1) != simcall_comm_irecv__get__rdv(r2))
124     return FALSE;
125
126   if (r1->call == SIMCALL_COMM_WAIT
127       && (r2->call == SIMCALL_COMM_WAIT || r2->call == SIMCALL_COMM_TEST)
128       && (simcall_comm_wait__get__comm(r1)->comm.src_proc == NULL
129           || simcall_comm_wait__get__comm(r1)->comm.dst_proc == NULL))
130     return FALSE;
131
132   if (r2->call == SIMCALL_COMM_WAIT
133       && (r1->call == SIMCALL_COMM_WAIT || r1->call == SIMCALL_COMM_TEST)
134       && (simcall_comm_wait__get__comm(r2)->comm.src_proc == NULL
135           || simcall_comm_wait__get__comm(r2)->comm.dst_proc == NULL))
136     return FALSE;
137
138   if (r1->call == SIMCALL_COMM_WAIT && r2->call == SIMCALL_COMM_WAIT
139       && simcall_comm_wait__get__comm(r1)->comm.src_buff ==
140       simcall_comm_wait__get__comm(r2)->comm.src_buff
141       && simcall_comm_wait__get__comm(r1)->comm.dst_buff ==
142       simcall_comm_wait__get__comm(r2)->comm.dst_buff)
143     return FALSE;
144
145   if (r1->call == SIMCALL_COMM_WAIT && r2->call == SIMCALL_COMM_WAIT
146       && simcall_comm_wait__get__comm(r1)->comm.src_buff != NULL
147       && simcall_comm_wait__get__comm(r1)->comm.dst_buff != NULL
148       && simcall_comm_wait__get__comm(r2)->comm.src_buff != NULL
149       && simcall_comm_wait__get__comm(r2)->comm.dst_buff != NULL
150       && simcall_comm_wait__get__comm(r1)->comm.dst_buff !=
151       simcall_comm_wait__get__comm(r2)->comm.src_buff
152       && simcall_comm_wait__get__comm(r1)->comm.dst_buff !=
153       simcall_comm_wait__get__comm(r2)->comm.dst_buff
154       && simcall_comm_wait__get__comm(r2)->comm.dst_buff !=
155       simcall_comm_wait__get__comm(r1)->comm.src_buff)
156     return FALSE;
157
158   if (r1->call == SIMCALL_COMM_TEST &&
159       (simcall_comm_test__get__comm(r1) == NULL
160        || simcall_comm_test__get__comm(r1)->comm.src_buff == NULL
161        || simcall_comm_test__get__comm(r1)->comm.dst_buff == NULL))
162     return FALSE;
163
164   if (r2->call == SIMCALL_COMM_TEST &&
165       (simcall_comm_test__get__comm(r2) == NULL
166        || simcall_comm_test__get__comm(r2)->comm.src_buff == NULL
167        || simcall_comm_test__get__comm(r2)->comm.dst_buff == NULL))
168     return FALSE;
169
170   if (r1->call == SIMCALL_COMM_TEST && r2->call == SIMCALL_COMM_WAIT
171       && simcall_comm_test__get__comm(r1)->comm.src_buff ==
172       simcall_comm_wait__get__comm(r2)->comm.src_buff
173       && simcall_comm_test__get__comm(r1)->comm.dst_buff ==
174       simcall_comm_wait__get__comm(r2)->comm.dst_buff)
175     return FALSE;
176
177   if (r1->call == SIMCALL_COMM_WAIT && r2->call == SIMCALL_COMM_TEST
178       && simcall_comm_wait__get__comm(r1)->comm.src_buff ==
179       simcall_comm_test__get__comm(r2)->comm.src_buff
180       && simcall_comm_wait__get__comm(r1)->comm.dst_buff ==
181       simcall_comm_test__get__comm(r2)->comm.dst_buff)
182     return FALSE;
183
184   if (r1->call == SIMCALL_COMM_WAIT && r2->call == SIMCALL_COMM_TEST
185       && simcall_comm_wait__get__comm(r1)->comm.src_buff != NULL
186       && simcall_comm_wait__get__comm(r1)->comm.dst_buff != NULL
187       && simcall_comm_test__get__comm(r2)->comm.src_buff != NULL
188       && simcall_comm_test__get__comm(r2)->comm.dst_buff != NULL
189       && simcall_comm_wait__get__comm(r1)->comm.dst_buff !=
190       simcall_comm_test__get__comm(r2)->comm.src_buff
191       && simcall_comm_wait__get__comm(r1)->comm.dst_buff !=
192       simcall_comm_test__get__comm(r2)->comm.dst_buff
193       && simcall_comm_test__get__comm(r2)->comm.dst_buff !=
194       simcall_comm_wait__get__comm(r1)->comm.src_buff)
195     return FALSE;
196
197   if (r1->call == SIMCALL_COMM_TEST && r2->call == SIMCALL_COMM_WAIT
198       && simcall_comm_test__get__comm(r1)->comm.src_buff != NULL
199       && simcall_comm_test__get__comm(r1)->comm.dst_buff != NULL
200       && simcall_comm_wait__get__comm(r2)->comm.src_buff != NULL
201       && simcall_comm_wait__get__comm(r2)->comm.dst_buff != NULL
202       && simcall_comm_test__get__comm(r1)->comm.dst_buff !=
203       simcall_comm_wait__get__comm(r2)->comm.src_buff
204       && simcall_comm_test__get__comm(r1)->comm.dst_buff !=
205       simcall_comm_wait__get__comm(r2)->comm.dst_buff
206       && simcall_comm_wait__get__comm(r2)->comm.dst_buff !=
207       simcall_comm_test__get__comm(r1)->comm.src_buff)
208     return FALSE;
209
210
211   return TRUE;
212 }
213
214 static char *pointer_to_string(void *pointer)
215 {
216
217   if (XBT_LOG_ISENABLED(mc_request, xbt_log_priority_verbose))
218     return bprintf("%p", pointer);
219
220   return xbt_strdup("(verbose only)");
221 }
222
223 static char *buff_size_to_string(size_t buff_size)
224 {
225
226   if (XBT_LOG_ISENABLED(mc_request, xbt_log_priority_verbose))
227     return bprintf("%zu", buff_size);
228
229   return xbt_strdup("(verbose only)");
230 }
231
232
233 char *MC_request_to_string(smx_simcall_t req, int value)
234 {
235   char *type = NULL, *args = NULL, *str = NULL, *p = NULL, *bs = NULL;
236   smx_synchro_t act = NULL;
237   size_t size = 0;
238
239   smx_process_t issuer = MC_smx_simcall_get_issuer(req);
240
241   switch (req->call) {
242   case SIMCALL_COMM_ISEND:
243     type = xbt_strdup("iSend");
244     p = pointer_to_string(simcall_comm_isend__get__src_buff(req));
245     bs = buff_size_to_string(simcall_comm_isend__get__src_buff_size(req));
246     if (issuer->smx_host)
247       args =
248           bprintf("src=(%lu)%s (%s), buff=%s, size=%s", issuer->pid,
249                   MC_smx_process_get_host_name(issuer),
250                   MC_smx_process_get_name(issuer),
251                   p, bs);
252     else
253       args =
254           bprintf("src=(%lu)%s, buff=%s, size=%s", issuer->pid,
255                   MC_smx_process_get_name(issuer), p, bs);
256     break;
257   case SIMCALL_COMM_IRECV:
258     size =
259         simcall_comm_irecv__get__dst_buff_size(req) ?
260         *simcall_comm_irecv__get__dst_buff_size(req) : 0;
261     type = xbt_strdup("iRecv");
262     p = pointer_to_string(simcall_comm_irecv__get__dst_buff(req));
263     bs = buff_size_to_string(size);
264     if (issuer->smx_host)
265       args =
266           bprintf("dst=(%lu)%s (%s), buff=%s, size=%s", issuer->pid,
267                   MC_smx_process_get_host_name(issuer),
268                   MC_smx_process_get_name(issuer),
269                   p, bs);
270     else
271       args =
272           bprintf("dst=(%lu)%s, buff=%s, size=%s", issuer->pid,
273                   MC_smx_process_get_name(issuer),
274                   p, bs);
275     break;
276   case SIMCALL_COMM_WAIT:
277     act = simcall_comm_wait__get__comm(req);
278     if (value == -1) {
279       type = xbt_strdup("WaitTimeout");
280       p = pointer_to_string(act);
281       args = bprintf("comm=%s", p);
282     } else {
283       type = xbt_strdup("Wait");
284       p = pointer_to_string(act);
285       // TODO, fix remote access to comm
286       smx_process_t src_proc = MC_smx_resolve_process(act->comm.src_proc);
287       smx_process_t dst_proc = MC_smx_resolve_process(act->comm.dst_proc);
288       args = bprintf("comm=%s [(%lu)%s (%s)-> (%lu)%s (%s)]", p,
289                      src_proc ? src_proc->pid : 0,
290                      src_proc ? MC_smx_process_get_host_name(src_proc) : "",
291                      src_proc ? MC_smx_process_get_name(src_proc) : "",
292                      dst_proc ? dst_proc->pid : 0,
293                      dst_proc ? MC_smx_process_get_host_name(dst_proc) : "",
294                      dst_proc ? MC_smx_process_get_name(dst_proc) : "");
295     }
296     break;
297   case SIMCALL_COMM_TEST:
298     act = simcall_comm_test__get__comm(req);
299     if (act->comm.src_proc == NULL || act->comm.dst_proc == NULL) {
300       type = xbt_strdup("Test FALSE");
301       p = pointer_to_string(act);
302       args = bprintf("comm=%s", p);
303     } else {
304       type = xbt_strdup("Test TRUE");
305       p = pointer_to_string(act);
306       // TODO, get process, get process name
307       smx_process_t src_proc = MC_smx_resolve_process(act->comm.src_proc);
308       smx_process_t dst_proc = MC_smx_resolve_process(act->comm.dst_proc);
309       args = bprintf("comm=%s [(%lu)%s (%s) -> (%lu)%s (%s)]", p,
310                      src_proc->pid,
311                      MC_smx_process_get_name(src_proc),
312                      MC_smx_process_get_host_name(src_proc),
313                      dst_proc->pid,
314                      MC_smx_process_get_name(dst_proc),
315                      MC_smx_process_get_host_name(dst_proc));
316     }
317     break;
318
319   case SIMCALL_COMM_WAITANY:
320     type = xbt_strdup("WaitAny");
321     if (!xbt_dynar_is_empty(simcall_comm_waitany__get__comms(req))) {
322       p = pointer_to_string(xbt_dynar_get_as
323                             (simcall_comm_waitany__get__comms(req), value,
324                              smx_synchro_t));
325       args =
326           bprintf("comm=%s (%d of %lu)", p, value + 1,
327                   xbt_dynar_length(simcall_comm_waitany__get__comms(req)));
328     } else {
329       args = bprintf("comm at idx %d", value);
330     }
331     break;
332
333   case SIMCALL_COMM_TESTANY:
334     if (value == -1) {
335       type = xbt_strdup("TestAny FALSE");
336       args = xbt_strdup("-");
337     } else {
338       type = xbt_strdup("TestAny");
339       args =
340           bprintf("(%d of %lu)", value + 1,
341                   xbt_dynar_length(simcall_comm_testany__get__comms(req)));
342     }
343     break;
344
345   case SIMCALL_MC_SNAPSHOT:
346     type = xbt_strdup("MC_SNAPSHOT");
347     args = NULL;
348     break;
349
350   case SIMCALL_MC_COMPARE_SNAPSHOTS:
351     type = xbt_strdup("MC_COMPARE_SNAPSHOTS");
352     args = NULL;
353     break;
354
355   case SIMCALL_MC_RANDOM:
356     type = xbt_strdup("MC_RANDOM");
357     args = bprintf("%d", value);
358     break;
359
360   default:
361     THROW_UNIMPLEMENTED;
362   }
363
364   if (args != NULL) {
365     // FIXME, get process name
366     str =
367         bprintf("[(%lu)%s (%s)] %s(%s)", issuer->pid,
368                 MC_smx_process_get_host_name(issuer),
369                 MC_smx_process_get_name(issuer),
370                 type, args);
371   } else {
372     // FIXME, get process name
373     str =
374         bprintf("[(%lu)%s (%s)] %s ", issuer->pid,
375                 MC_smx_process_get_host_name(issuer),
376                 MC_smx_process_get_name(issuer),
377                 type);
378   }
379
380   xbt_free(args);
381   xbt_free(type);
382   xbt_free(p);
383   xbt_free(bs);
384   return str;
385 }
386
387 unsigned int MC_request_testany_fail(smx_simcall_t req)
388 {
389   unsigned int cursor;
390   smx_synchro_t action;
391
392   xbt_dynar_foreach(simcall_comm_testany__get__comms(req), cursor, action) {
393     // FIXME, remote access to comm object
394     if (action->comm.src_proc && action->comm.dst_proc)
395       return FALSE;
396   }
397
398   return TRUE;
399 }
400
401 int MC_request_is_enabled_by_idx(smx_simcall_t req, unsigned int idx)
402 {
403   smx_synchro_t act;
404
405   // FIXME, remote access to comm object
406
407   switch (req->call) {
408
409   case SIMCALL_COMM_WAIT:
410     /* FIXME: check also that src and dst processes are not suspended */
411     act = simcall_comm_wait__get__comm(req);
412     return (act->comm.src_proc && act->comm.dst_proc);
413     break;
414
415   case SIMCALL_COMM_WAITANY:
416     act =
417         xbt_dynar_get_as(simcall_comm_waitany__get__comms(req), idx,
418                          smx_synchro_t);
419     return (act->comm.src_proc && act->comm.dst_proc);
420     break;
421
422   case SIMCALL_COMM_TESTANY:
423     act =
424         xbt_dynar_get_as(simcall_comm_testany__get__comms(req), idx,
425                          smx_synchro_t);
426     return (act->comm.src_proc && act->comm.dst_proc);
427     break;
428
429   default:
430     return TRUE;
431   }
432 }
433
434 int MC_process_is_enabled(smx_process_t process)
435 {
436   return MC_request_is_enabled(&process->simcall);
437 }
438
439 char *MC_request_get_dot_output(smx_simcall_t req, int value)
440 {
441   char *str = NULL, *label = NULL;
442   smx_synchro_t act = NULL;
443
444   const smx_process_t issuer = MC_smx_simcall_get_issuer(req);
445
446   switch (req->call) {
447   case SIMCALL_COMM_ISEND:
448     if (issuer->smx_host)
449       label =
450           bprintf("[(%lu)%s] iSend", issuer->pid,
451                   MC_smx_process_get_host_name(issuer));
452     else
453       label = bprintf("[(%lu)] iSend", issuer->pid);
454     break;
455
456   case SIMCALL_COMM_IRECV:
457     if (issuer->smx_host)
458       label =
459           bprintf("[(%lu)%s] iRecv", issuer->pid,
460                   MC_smx_process_get_host_name(issuer));
461     else
462       label = bprintf("[(%lu)] iRecv", issuer->pid);
463     break;
464
465   case SIMCALL_COMM_WAIT:
466     act = simcall_comm_wait__get__comm(req);
467     if (value == -1) {
468       if (issuer->smx_host)
469         label =
470             bprintf("[(%lu)%s] WaitTimeout", issuer->pid,
471                     MC_smx_process_get_host_name(issuer));
472       else
473         label = bprintf("[(%lu)] WaitTimeout", issuer->pid);
474     } else {
475       if (issuer->smx_host)
476         label =
477             bprintf("[(%lu)%s] Wait [(%lu)->(%lu)]", issuer->pid,
478                     MC_smx_process_get_host_name(issuer),
479                     act->comm.src_proc ? act->comm.src_proc->pid : 0,
480                     act->comm.dst_proc ? act->comm.dst_proc->pid : 0);
481       else
482         label =
483             bprintf("[(%lu)] Wait [(%lu)->(%lu)]", issuer->pid,
484                     act->comm.src_proc ? act->comm.src_proc->pid : 0,
485                     act->comm.dst_proc ? act->comm.dst_proc->pid : 0);
486     }
487     break;
488
489   case SIMCALL_COMM_TEST:
490     act = simcall_comm_test__get__comm(req);
491     if (act->comm.src_proc == NULL || act->comm.dst_proc == NULL) {
492       if (issuer->smx_host)
493         label =
494             bprintf("[(%lu)%s] Test FALSE", issuer->pid,
495                     MC_smx_process_get_host_name(issuer));
496       else
497         label = bprintf("[(%lu)] Test FALSE", issuer->pid);
498     } else {
499       if (issuer->smx_host)
500         label =
501             bprintf("[(%lu)%s] Test TRUE", issuer->pid,
502                     MC_smx_process_get_host_name(issuer));
503       else
504         label = bprintf("[(%lu)] Test TRUE", issuer->pid);
505     }
506     break;
507
508   case SIMCALL_COMM_WAITANY:
509     if (issuer->smx_host)
510       label =
511           bprintf("[(%lu)%s] WaitAny [%d of %lu]", issuer->pid,
512                   MC_smx_process_get_host_name(issuer), value + 1,
513                   xbt_dynar_length(simcall_comm_waitany__get__comms(req)));
514     else
515       label =
516           bprintf("[(%lu)] WaitAny [%d of %lu]", issuer->pid, value + 1,
517                   xbt_dynar_length(simcall_comm_waitany__get__comms(req)));
518     break;
519
520   case SIMCALL_COMM_TESTANY:
521     if (value == -1) {
522       if (issuer->smx_host)
523         label =
524             bprintf("[(%lu)%s] TestAny FALSE", issuer->pid,
525                     MC_smx_process_get_host_name(issuer));
526       else
527         label = bprintf("[(%lu)] TestAny FALSE", issuer->pid);
528     } else {
529       if (issuer->smx_host)
530         label =
531             bprintf("[(%lu)%s] TestAny TRUE [%d of %lu]", issuer->pid,
532                     MC_smx_process_get_host_name(issuer), value + 1,
533                     xbt_dynar_length(simcall_comm_testany__get__comms(req)));
534       else
535         label =
536             bprintf("[(%lu)] TestAny TRUE [%d of %lu]", issuer->pid,
537                     value + 1,
538                     xbt_dynar_length(simcall_comm_testany__get__comms(req)));
539     }
540     break;
541
542   case SIMCALL_MC_RANDOM:
543     if (issuer->smx_host)
544       label =
545           bprintf("[(%lu)%s] MC_RANDOM (%d)", issuer->pid,
546                   MC_smx_process_get_host_name(issuer), value);
547     else
548       label = bprintf("[(%lu)] MC_RANDOM (%d)", issuer->pid, value);
549     break;
550
551   case SIMCALL_MC_SNAPSHOT:
552     if (issuer->smx_host)
553       label =
554           bprintf("[(%lu)%s] MC_SNAPSHOT", issuer->pid,
555                   MC_smx_process_get_host_name(issuer));
556     else
557       label = bprintf("[(%lu)] MC_SNAPSHOT", issuer->pid);
558     break;
559
560   case SIMCALL_MC_COMPARE_SNAPSHOTS:
561     if (issuer->smx_host)
562       label =
563           bprintf("[(%lu)%s] MC_COMPARE_SNAPSHOTS", issuer->pid,
564                   MC_smx_process_get_host_name(issuer));
565     else
566       label = bprintf("[(%lu)] MC_COMPARE_SNAPSHOTS", issuer->pid);
567     break;
568
569   default:
570     THROW_UNIMPLEMENTED;
571   }
572
573   str =
574       bprintf("label = \"%s\", color = %s, fontcolor = %s", label,
575               colors[issuer->pid - 1], colors[issuer->pid - 1]);
576   xbt_free(label);
577   return str;
578
579 }