1 /* Copyright (c) 2008-2014. The SimGrid Team.
2 * All rights reserved. */
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. */
13 #include "internal_config.h"
14 #include "mc_memory_map.h"
15 #include "mc_private.h"
16 #include "xbt/module.h"
17 #include <xbt/mmalloc.h>
18 #include "../smpi/private.h"
21 #include "xbt/mmalloc/mmprivate.h"
23 #include "../simix/smx_private.h"
25 #include <libunwind.h>
28 #include "mc_private.h"
31 #include "mc_snapshot.h"
32 #include "mc_object_info.h"
35 #include "mc_protocol.h"
38 using simgrid::mc::remote;
42 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_checkpoint, mc,
43 "Logging specific to mc_checkpoint");
45 /************************************ Free functions **************************************/
46 /*****************************************************************************************/
48 static void MC_snapshot_stack_free(mc_snapshot_stack_t s)
51 xbt_dynar_free(&(s->local_variables));
52 xbt_dynar_free(&(s->stack_frames));
53 mc_unw_destroy_context(s->context);
59 static void MC_snapshot_stack_free_voidp(void *s)
61 mc_snapshot_stack_t stack = (mc_snapshot_stack_t) * (void **) s;
62 MC_snapshot_stack_free(stack);
65 static void local_variable_free(local_variable_t v)
71 static void local_variable_free_voidp(void *v)
73 local_variable_free((local_variable_t) * (void **) v);
76 void MC_region_destroy(mc_mem_region_t region)
80 switch(region->storage_type) {
81 case MC_REGION_STORAGE_TYPE_NONE:
83 case MC_REGION_STORAGE_TYPE_FLAT:
84 xbt_free(region->flat.data);
86 case MC_REGION_STORAGE_TYPE_CHUNKED:
87 mc_free_page_snapshot_region(region->chunked.page_numbers, mc_page_count(region->size));
88 xbt_free(region->chunked.page_numbers);
90 case MC_REGION_STORAGE_TYPE_PRIVATIZED:
92 size_t regions_count = region->privatized.regions_count;
93 for (size_t i=0; i!=regions_count; ++i) {
94 MC_region_destroy(region->privatized.regions[i]);
96 free(region->privatized.regions);
103 /******************************* Snapshot regions ********************************/
104 /*********************************************************************************/
106 static mc_mem_region_t mc_region_new_dense(
107 mc_region_type_t region_type,
108 void *start_addr, void* permanent_addr, size_t size)
110 mc_mem_region_t region = xbt_new(s_mc_mem_region_t, 1);
111 region->region_type = region_type;
112 region->storage_type = MC_REGION_STORAGE_TYPE_FLAT;
113 region->start_addr = start_addr;
114 region->permanent_addr = permanent_addr;
116 region->flat.data = xbt_malloc(size);
117 mc_model_checker->process().read_bytes(region->flat.data, size,
118 remote(permanent_addr),
119 simgrid::mc::ProcessIndexDisabled);
120 XBT_DEBUG("New region : type : %d, data : %p (real addr %p), size : %zu",
121 region_type, region->flat.data, permanent_addr, size);
125 /** @brief Take a snapshot of a given region
128 * @param start_addr Address of the region in the simulated process
129 * @param permanent_addr Permanent address of this data (for privatized variables, this is the virtual address of the privatized mapping)
130 * @param size Size of the data*
132 static mc_mem_region_t MC_region_new(
133 mc_region_type_t type, void *start_addr, void* permanent_addr, size_t size)
135 if (_sg_mc_sparse_checkpoint) {
136 return mc_region_new_sparse(type, start_addr, permanent_addr, size);
138 return mc_region_new_dense(type, start_addr, permanent_addr, size);
142 /** @brief Restore a region from a snapshot
144 * @param reg Target region
146 static void MC_region_restore(mc_mem_region_t region)
148 switch(region->storage_type) {
149 case MC_REGION_STORAGE_TYPE_NONE:
151 xbt_die("Storage type not supported");
154 case MC_REGION_STORAGE_TYPE_FLAT:
155 mc_model_checker->process().write_bytes(region->flat.data, region->size,
156 remote(region->permanent_addr));
159 case MC_REGION_STORAGE_TYPE_CHUNKED:
160 mc_region_restore_sparse(&mc_model_checker->process(), region);
163 case MC_REGION_STORAGE_TYPE_PRIVATIZED:
165 size_t process_count = region->privatized.regions_count;
166 for (size_t i = 0; i < process_count; i++) {
167 MC_region_restore(region->privatized.regions[i]);
174 static mc_mem_region_t MC_region_new_privatized(
175 mc_region_type_t region_type, void *start_addr, void* permanent_addr, size_t size
178 size_t process_count = MC_smpi_process_count();
179 mc_mem_region_t region = xbt_new(s_mc_mem_region_t, 1);
180 region->region_type = region_type;
181 region->storage_type = MC_REGION_STORAGE_TYPE_PRIVATIZED;
182 region->start_addr = start_addr;
183 region->permanent_addr = permanent_addr;
185 region->privatized.regions_count = process_count;
186 region->privatized.regions = xbt_new(mc_mem_region_t, process_count);
188 // Read smpi_privatisation_regions from MCed:
189 smpi_privatisation_region_t remote_smpi_privatisation_regions;
190 mc_model_checker->process().read_variable(
191 "smpi_privatisation_regions",
192 &remote_smpi_privatisation_regions, sizeof(remote_smpi_privatisation_regions));
193 s_smpi_privatisation_region_t privatisation_regions[process_count];
194 mc_model_checker->process().read_bytes(
195 &privatisation_regions, sizeof(privatisation_regions),
196 remote(remote_smpi_privatisation_regions));
198 for (size_t i = 0; i < process_count; i++) {
199 region->privatized.regions[i] =
200 MC_region_new(region_type, start_addr,
201 privatisation_regions[i].address, size);
207 static void MC_snapshot_add_region(int index, mc_snapshot_t snapshot, mc_region_type_t type,
208 mc_object_info_t object_info,
209 void *start_addr, void* permanent_addr, size_t size)
211 if (type == MC_REGION_TYPE_DATA)
212 xbt_assert(object_info, "Missing object info for object.");
213 else if (type == MC_REGION_TYPE_HEAP)
214 xbt_assert(!object_info, "Unexpected object info for heap region.");
216 mc_mem_region_t region;
217 const bool privatization_aware = MC_object_info_is_privatized(object_info);
218 if (privatization_aware && MC_smpi_process_count())
219 region = MC_region_new_privatized(type, start_addr, permanent_addr, size);
221 region = MC_region_new(type, start_addr, permanent_addr, size);
223 region->object_info = object_info;
224 snapshot->snapshot_regions[index] = region;
228 static void MC_get_memory_regions(mc_process_t process, mc_snapshot_t snapshot)
230 const size_t n = process->object_infos_size;
231 snapshot->snapshot_regions_count = n + 1;
232 snapshot->snapshot_regions = xbt_new0(mc_mem_region_t, n + 1);
234 for (size_t i = 0; i!=n; ++i) {
235 mc_object_info_t object_info = process->object_infos[i];
236 MC_snapshot_add_region(i, snapshot, MC_REGION_TYPE_DATA, object_info,
237 object_info->start_rw, object_info->start_rw,
238 object_info->end_rw - object_info->start_rw);
241 xbt_mheap_t heap = process->get_heap();
242 void *start_heap = heap->base;
243 void *end_heap = heap->breakval;
245 MC_snapshot_add_region(n, snapshot, MC_REGION_TYPE_HEAP, NULL,
246 start_heap, start_heap,
247 (char *) end_heap - (char *) start_heap);
248 snapshot->heap_bytes_used = mmalloc_get_bytes_used_remote(
250 process->get_malloc_info());
253 if (smpi_privatize_global_variables && MC_smpi_process_count()) {
254 // snapshot->privatization_index = smpi_loaded_page
255 mc_model_checker->process().read_variable(
256 "smpi_loaded_page", &snapshot->privatization_index,
257 sizeof(snapshot->privatization_index));
261 snapshot->privatization_index = simgrid::mc::ProcessIndexMissing;
265 /** \brief Fills the position of the segments (executable, read-only, read/write).
267 * `dl_iterate_phdr` would be more robust but would not work in cross-process.
269 void MC_find_object_address(memory_map_t maps, mc_object_info_t result)
273 const char *name = basename(result->file_name);
274 while (i < maps->mapsize) {
275 reg = maps->regions[i];
276 if (maps->regions[i].pathname == NULL
277 || strcmp(basename(maps->regions[i].pathname), name)) {
279 } else if ((reg.prot & PROT_WRITE)) {
280 xbt_assert(!result->start_rw,
281 "Multiple read-write segments for %s, not supported",
282 maps->regions[i].pathname);
283 result->start_rw = (char*) reg.start_addr;
284 result->end_rw = (char*) reg.end_addr;
285 // .bss is usually after the .data:
286 s_map_region_t *next = &(maps->regions[i + 1]);
287 if (next->pathname == NULL && (next->prot & PROT_WRITE)
288 && next->start_addr == reg.end_addr) {
289 result->end_rw = (char*) maps->regions[i + 1].end_addr;
291 } else if ((reg.prot & PROT_READ) && (reg.prot & PROT_EXEC)) {
292 xbt_assert(!result->start_exec,
293 "Multiple executable segments for %s, not supported",
294 maps->regions[i].pathname);
295 result->start_exec = (char*) reg.start_addr;
296 result->end_exec = (char*) reg.end_addr;
297 } else if ((reg.prot & PROT_READ) && !(reg.prot & PROT_EXEC)) {
298 xbt_assert(!result->start_ro,
299 "Multiple read only segments for %s, not supported",
300 maps->regions[i].pathname);
301 result->start_ro = (char*) reg.start_addr;
302 result->end_ro = (char*) reg.end_addr;
307 result->start = result->start_rw;
308 if ((const void*) result->start_ro > result->start)
309 result->start = result->start_ro;
310 if ((const void*) result->start_exec > result->start)
311 result->start = result->start_exec;
313 result->end = result->end_rw;
314 if (result->end_ro && (const void*) result->end_ro < result->end)
315 result->end = result->end_ro;
316 if (result->end_exec && (const void*) result->end_exec > result->end)
317 result->end = result->end_exec;
319 xbt_assert(result->file_name);
320 xbt_assert(result->start_rw);
321 xbt_assert(result->start_exec);
324 /************************************* Take Snapshot ************************************/
325 /****************************************************************************************/
327 /** \brief Checks whether the variable is in scope for a given IP.
329 * A variable may be defined only from a given value of IP.
331 * \param var Variable description
332 * \param frame Scope description
333 * \param ip Instruction pointer
334 * \return true if the variable is valid
336 static bool mc_valid_variable(dw_variable_t var, dw_frame_t scope,
339 // The variable is not yet valid:
340 if ((const void *) ((const char *) scope->low_pc + var->start_scope) > ip)
346 static void mc_fill_local_variables_values(mc_stack_frame_t stack_frame,
347 dw_frame_t scope, int process_index, xbt_dynar_t result)
349 mc_process_t process = &mc_model_checker->process();
351 void *ip = (void *) stack_frame->ip;
352 if (ip < scope->low_pc || ip >= scope->high_pc)
356 dw_variable_t current_variable;
357 xbt_dynar_foreach(scope->variables, cursor, current_variable) {
359 if (!mc_valid_variable(current_variable, scope, (void *) stack_frame->ip))
363 // FIXME, get rid of `region_type`
364 if ((long) stack_frame->ip > (long) process->libsimgrid_info->start_exec)
369 local_variable_t new_var = xbt_new0(s_local_variable_t, 1);
370 new_var->subprogram = stack_frame->frame;
371 new_var->ip = stack_frame->ip;
372 new_var->name = xbt_strdup(current_variable->name);
373 new_var->type = current_variable->type;
374 new_var->region = region_type;
376 if (current_variable->address != NULL) {
377 new_var->address = current_variable->address;
378 } else if (current_variable->locations.size != 0) {
379 s_mc_location_t location;
380 mc_dwarf_resolve_locations(
381 &location, ¤t_variable->locations,
382 current_variable->object_info,
383 &(stack_frame->unw_cursor),
384 (void *) stack_frame->frame_base,
385 &mc_model_checker->process(), process_index);
387 switch(mc_get_location_type(&location)) {
388 case MC_LOCATION_TYPE_ADDRESS:
389 new_var->address = location.memory_location;
391 case MC_LOCATION_TYPE_REGISTER:
393 xbt_die("Cannot handle non-address variable");
397 xbt_die("No address");
400 xbt_dynar_push(result, &new_var);
403 // Recursive processing of nested scopes:
404 dw_frame_t nested_scope = NULL;
405 xbt_dynar_foreach(scope->scopes, cursor, nested_scope) {
406 mc_fill_local_variables_values(stack_frame, nested_scope, process_index, result);
410 static xbt_dynar_t MC_get_local_variables_values(xbt_dynar_t stack_frames, int process_index)
413 unsigned cursor1 = 0;
414 mc_stack_frame_t stack_frame;
415 xbt_dynar_t variables =
416 xbt_dynar_new(sizeof(local_variable_t), local_variable_free_voidp);
418 xbt_dynar_foreach(stack_frames, cursor1, stack_frame) {
419 mc_fill_local_variables_values(stack_frame, stack_frame->frame, process_index, variables);
425 static void MC_stack_frame_free_voipd(void *s)
427 mc_stack_frame_t stack_frame = *(mc_stack_frame_t *) s;
429 xbt_free(stack_frame->frame_name);
430 xbt_free(stack_frame);
434 static xbt_dynar_t MC_unwind_stack_frames(mc_unw_context_t stack_context)
436 mc_process_t process = &mc_model_checker->process();
438 xbt_dynar_new(sizeof(mc_stack_frame_t), MC_stack_frame_free_voipd);
442 // TODO, check condition check (unw_init_local==0 means end of frame)
443 if (mc_unw_init_cursor(&c, stack_context) != 0) {
445 xbt_die("Could not initialize stack unwinding");
450 mc_stack_frame_t stack_frame = xbt_new(s_mc_stack_frame_t, 1);
451 xbt_dynar_push(result, &stack_frame);
453 stack_frame->unw_cursor = c;
457 unw_get_reg(&c, UNW_REG_IP, &ip);
458 unw_get_reg(&c, UNW_REG_SP, &sp);
460 stack_frame->ip = ip;
461 stack_frame->sp = sp;
463 // TODO, use real addresses in frame_t instead of fixing it here
465 dw_frame_t frame = process->find_function(remote(ip));
466 stack_frame->frame = frame;
469 stack_frame->frame_name = xbt_strdup(frame->name);
470 stack_frame->frame_base =
471 (unw_word_t) mc_find_frame_base(frame, frame->object_info, &c);
473 stack_frame->frame_base = 0;
474 stack_frame->frame_name = NULL;
477 /* Stop before context switch with maestro */
478 if (frame != NULL && frame->name != NULL
479 && !strcmp(frame->name, "smx_ctx_sysv_wrapper"))
482 int ret = unw_step(&c);
484 xbt_die("Unexpected end of stack.");
485 } else if (ret < 0) {
486 xbt_die("Error while unwinding stack");
490 if (xbt_dynar_length(result) == 0) {
491 XBT_INFO("unw_init_local failed");
498 static xbt_dynar_t MC_take_snapshot_stacks(mc_snapshot_t * snapshot)
502 xbt_dynar_new(sizeof(s_mc_snapshot_stack_t),
503 MC_snapshot_stack_free_voidp);
505 unsigned int cursor = 0;
506 stack_region_t current_stack;
508 // FIXME, cross-process support (stack_areas)
509 xbt_dynar_foreach(stacks_areas, cursor, current_stack) {
510 mc_snapshot_stack_t st = xbt_new(s_mc_snapshot_stack_t, 1);
512 // Read the context from remote process:
513 unw_context_t context;
514 mc_model_checker->process().read_bytes(
515 &context, sizeof(context), remote(current_stack->context));
517 st->context = xbt_new0(s_mc_unw_context_t, 1);
518 if (mc_unw_init_context(st->context, &mc_model_checker->process(),
520 xbt_die("Could not initialise the libunwind context.");
523 st->stack_frames = MC_unwind_stack_frames(st->context);
524 st->local_variables = MC_get_local_variables_values(st->stack_frames, current_stack->process_index);
525 st->process_index = current_stack->process_index;
527 unw_word_t sp = xbt_dynar_get_as(st->stack_frames, 0, mc_stack_frame_t)->sp;
529 xbt_dynar_push(res, &st);
530 (*snapshot)->stack_sizes = (size_t*)
531 xbt_realloc((*snapshot)->stack_sizes, (cursor + 1) * sizeof(size_t));
532 (*snapshot)->stack_sizes[cursor] =
533 (char*) current_stack->address + current_stack->size - (char*) sp;
540 static xbt_dynar_t MC_take_snapshot_ignore()
543 if (mc_heap_comparison_ignore == NULL)
547 xbt_dynar_new(sizeof(mc_heap_ignore_region_t),
548 heap_ignore_region_free_voidp);
550 unsigned int cursor = 0;
551 mc_heap_ignore_region_t current_region;
553 xbt_dynar_foreach(mc_heap_comparison_ignore, cursor, current_region) {
554 mc_heap_ignore_region_t new_region = NULL;
555 new_region = xbt_new0(s_mc_heap_ignore_region_t, 1);
556 new_region->address = current_region->address;
557 new_region->size = current_region->size;
558 new_region->block = current_region->block;
559 new_region->fragment = current_region->fragment;
560 xbt_dynar_push(cpy, &new_region);
567 static void mc_free_snapshot_ignored_data_pvoid(void* data) {
568 mc_snapshot_ignored_data_t ignored_data = (mc_snapshot_ignored_data_t) data;
569 free(ignored_data->data);
572 static void MC_snapshot_handle_ignore(mc_snapshot_t snapshot)
574 xbt_assert(snapshot->process);
575 snapshot->ignored_data = xbt_dynar_new(sizeof(s_mc_snapshot_ignored_data_t), mc_free_snapshot_ignored_data_pvoid);
578 for (auto const& region : mc_model_checker->process().ignored_regions()) {
579 s_mc_snapshot_ignored_data_t ignored_data;
580 ignored_data.start = (void*)region.addr;
581 ignored_data.size = region.size;
582 ignored_data.data = malloc(region.size);
583 // TODO, we should do this once per privatization segment:
584 snapshot->process->read_bytes(
585 ignored_data.data, region.size, remote(region.addr),
586 simgrid::mc::ProcessIndexDisabled);
587 xbt_dynar_push(snapshot->ignored_data, &ignored_data);
591 for(auto const& region : mc_model_checker->process().ignored_regions()) {
592 snapshot->process->clear_bytes(remote(region.addr), region.size);
597 static void MC_snapshot_ignore_restore(mc_snapshot_t snapshot)
599 unsigned int cursor = 0;
600 s_mc_snapshot_ignored_data_t ignored_data;
601 xbt_dynar_foreach (snapshot->ignored_data, cursor, ignored_data) {
602 snapshot->process->write_bytes(ignored_data.data, ignored_data.size,
603 remote(ignored_data.start));
607 static void MC_get_current_fd(mc_snapshot_t snapshot)
609 snapshot->total_fd = 0;
611 const size_t fd_dir_path_size = 20;
612 char fd_dir_path[fd_dir_path_size];
613 int res = snprintf(fd_dir_path, fd_dir_path_size,
614 "/proc/%lli/fd", (long long int) snapshot->process->pid());
615 xbt_assert(res >= 0);
616 if ((size_t) res > fd_dir_path_size)
617 xbt_die("Unexpected buffer is too small for fd_dir_path");
619 DIR* fd_dir = opendir(fd_dir_path);
621 xbt_die("Cannot open directory '/proc/self/fd'\n");
624 struct dirent* fd_number;
625 while ((fd_number = readdir(fd_dir))) {
627 int fd_value = atoi(fd_number->d_name);
632 const size_t source_size = 25;
634 int res = snprintf(source, source_size, "/proc/%lli/fd/%s",
635 (long long int) snapshot->process->pid(), fd_number->d_name);
636 xbt_assert(res >= 0);
637 if ((size_t) res > source_size)
638 xbt_die("Unexpected buffer is too small for fd %s", fd_number->d_name);
640 const size_t link_size = 200;
642 res = readlink(source, link, link_size);
644 xbt_die("Could not read link for %s", source);
647 xbt_die("Buffer to small for link of %s", source);
651 if(smpi_is_privatisation_file(link))
654 // This is (probably) the DIR* we are reading:
655 // TODO, read all the file entries at once and close the DIR.*
656 if(strcmp(fd_dir_path, link) == 0)
659 // We don't handle them.
660 // It does not mean we should silently ignore them however.
661 if (strncmp(link, "pipe:", 5) == 0 || strncmp(link, "socket:", 7) == 0)
664 // If dot_output enabled, do not handle the corresponding file
665 if (dot_output != NULL && strcmp(basename(link), _sg_mc_dot_output_file) == 0)
668 // This is probably a shared memory used by lttng-ust:
669 if(strncmp("/dev/shm/ust-shm-tmp-", link, 21)==0)
672 // Add an entry for this FD in the snapshot:
673 fd_infos_t fd = xbt_new0(s_fd_infos_t, 1);
674 fd->filename = strdup(link);
675 fd->number = fd_value;
676 fd->flags = fcntl(fd_value, F_GETFL) | fcntl(fd_value, F_GETFD) ;
677 fd->current_position = lseek(fd_value, 0, SEEK_CUR);
678 snapshot->current_fd = (fd_infos_t*) xbt_realloc(snapshot->current_fd, (total_fd + 1) * sizeof(fd_infos_t));
679 snapshot->current_fd[total_fd] = fd;
683 snapshot->total_fd = total_fd;
687 mc_snapshot_t MC_take_snapshot(int num_state)
689 XBT_DEBUG("Taking snapshot %i", num_state);
691 mc_process_t mc_process = &mc_model_checker->process();
693 mc_snapshot_t snapshot = new simgrid::mc::Snapshot();
695 snapshot->process = mc_process;
696 snapshot->num_state = num_state;
698 snapshot->enabled_processes = xbt_dynar_new(sizeof(int), NULL);
700 smx_process_t process;
701 MC_EACH_SIMIX_PROCESS(process,
702 xbt_dynar_push_as(snapshot->enabled_processes, int, (int)process->pid));
704 MC_snapshot_handle_ignore(snapshot);
706 if (_sg_mc_snapshot_fds)
707 MC_get_current_fd(snapshot);
709 /* Save the std heap and the writable mapped pages of libsimgrid and binary */
710 MC_get_memory_regions(mc_process, snapshot);
712 snapshot->to_ignore = MC_take_snapshot_ignore();
714 if (_sg_mc_visited > 0 || strcmp(_sg_mc_property_file, "")) {
716 MC_take_snapshot_stacks(&snapshot);
717 if (_sg_mc_hash && snapshot->stacks != NULL) {
718 snapshot->hash = mc_hash_processes_state(num_state, snapshot->stacks);
726 MC_snapshot_ignore_restore(snapshot);
731 void MC_restore_snapshot_regions(mc_snapshot_t snapshot)
733 const size_t n = snapshot->snapshot_regions_count;
734 for (size_t i = 0; i < n; i++) {
735 // For privatized, variables we decided it was not necessary to take the snapshot:
736 if (snapshot->snapshot_regions[i])
737 MC_region_restore(snapshot->snapshot_regions[i]);
741 // TODO, send a message to implement this in the MCed process
742 if(snapshot->privatization_index >= 0) {
743 // We just rewrote the global variables.
744 // The privatisation segment SMPI thinks
745 // is mapped might be inconsistent with the segment which
746 // is really mapped in memory (kernel state).
747 // We ask politely SMPI to map the segment anyway,
748 // even if it thinks it is the current one:
749 smpi_really_switch_data_segment(snapshot->privatization_index);
755 void MC_restore_snapshot_fds(mc_snapshot_t snapshot)
757 if (mc_mode == MC_MODE_SERVER)
758 xbt_die("FD snapshot not implemented in client/server mode.");
761 for (int i=0; i < snapshot->total_fd; i++) {
763 new_fd = open(snapshot->current_fd[i]->filename, snapshot->current_fd[i]->flags);
765 xbt_die("Could not reopen the file %s fo restoring the file descriptor",
766 snapshot->current_fd[i]->filename);
768 if(new_fd != -1 && new_fd != snapshot->current_fd[i]->number){
769 dup2(new_fd, snapshot->current_fd[i]->number);
770 //fprintf(stderr, "%p\n", fdopen(snapshot->current_fd[i]->number, "rw"));
773 lseek(snapshot->current_fd[i]->number, snapshot->current_fd[i]->current_position, SEEK_SET);
777 void MC_restore_snapshot(mc_snapshot_t snapshot)
779 XBT_DEBUG("Restore snapshot %i", snapshot->num_state);
780 MC_restore_snapshot_regions(snapshot);
781 if (_sg_mc_snapshot_fds)
782 MC_restore_snapshot_fds(snapshot);
783 MC_snapshot_ignore_restore(snapshot);
784 mc_model_checker->process().cache_flags = 0;
787 mc_snapshot_t simcall_HANDLER_mc_snapshot(smx_simcall_t simcall)
789 return MC_take_snapshot(1);