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. */
15 #include "internal_config.h"
16 #include "mc_memory_map.h"
17 #include "mc_private.h"
18 #include "xbt/module.h"
19 #include <xbt/mmalloc.h>
20 #include "../smpi/private.h"
23 #include "xbt/mmalloc/mmprivate.h"
25 #include "../simix/smx_private.h"
27 #include <libunwind.h>
30 #include "mc_private.h"
33 #include "mc_snapshot.h"
34 #include "mc_object_info.h"
37 #include "mc_protocol.h"
40 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_checkpoint, mc,
41 "Logging specific to mc_checkpoint");
43 /************************************ Free functions **************************************/
44 /*****************************************************************************************/
46 static void MC_snapshot_stack_free(mc_snapshot_stack_t s)
49 xbt_dynar_free(&(s->local_variables));
50 xbt_dynar_free(&(s->stack_frames));
51 mc_unw_destroy_context(s->context);
57 static void MC_snapshot_stack_free_voidp(void *s)
59 mc_snapshot_stack_t stack = (mc_snapshot_stack_t) * (void **) s;
60 MC_snapshot_stack_free(stack);
63 static void local_variable_free(local_variable_t v)
69 static void local_variable_free_voidp(void *v)
71 local_variable_free((local_variable_t) * (void **) v);
74 void MC_region_destroy(mc_mem_region_t region)
78 switch(region->storage_type) {
79 case MC_REGION_STORAGE_TYPE_NONE:
81 case MC_REGION_STORAGE_TYPE_FLAT:
82 xbt_free(region->flat.data);
84 case MC_REGION_STORAGE_TYPE_CHUNKED:
85 mc_free_page_snapshot_region(region->chunked.page_numbers, mc_page_count(region->size));
86 xbt_free(region->chunked.page_numbers);
88 case MC_REGION_STORAGE_TYPE_PRIVATIZED:
90 size_t regions_count = region->privatized.regions_count;
91 for (size_t i=0; i!=regions_count; ++i) {
92 MC_region_destroy(region->privatized.regions[i]);
94 free(region->privatized.regions);
101 void MC_free_snapshot(mc_snapshot_t snapshot)
103 for (size_t i = 0; i < snapshot->snapshot_regions_count; i++) {
104 MC_region_destroy(snapshot->snapshot_regions[i]);
106 xbt_free(snapshot->snapshot_regions);
107 xbt_free(snapshot->stack_sizes);
108 xbt_dynar_free(&(snapshot->stacks));
109 xbt_dynar_free(&(snapshot->to_ignore));
110 xbt_dynar_free(&snapshot->ignored_data);
114 /******************************* Snapshot regions ********************************/
115 /*********************************************************************************/
117 static mc_mem_region_t mc_region_new_dense(
118 mc_region_type_t region_type,
119 void *start_addr, void* permanent_addr, size_t size, mc_mem_region_t ref_reg)
121 mc_mem_region_t region = xbt_new(s_mc_mem_region_t, 1);
122 region->region_type = region_type;
123 region->storage_type = MC_REGION_STORAGE_TYPE_FLAT;
124 region->start_addr = start_addr;
125 region->permanent_addr = permanent_addr;
127 region->flat.data = xbt_malloc(size);
128 MC_process_read(&mc_model_checker->process, MC_ADDRESS_SPACE_READ_FLAGS_NONE,
129 region->flat.data, permanent_addr, size,
130 MC_PROCESS_INDEX_DISABLED);
131 XBT_DEBUG("New region : type : %d, data : %p (real addr %p), size : %zu",
132 region_type, region->flat.data, permanent_addr, size);
136 /** @brief Take a snapshot of a given region
139 * @param start_addr Address of the region in the simulated process
140 * @param permanent_addr Permanent address of this data (for privatized variables, this is the virtual address of the privatized mapping)
141 * @param size Size of the data*
142 * @param ref_reg Reference corresponding region
144 static mc_mem_region_t MC_region_new(mc_region_type_t type, void *start_addr, void* permanent_addr, size_t size, mc_mem_region_t ref_reg)
146 if (_sg_mc_sparse_checkpoint) {
147 return mc_region_new_sparse(type, start_addr, permanent_addr, size, ref_reg);
149 return mc_region_new_dense(type, start_addr, permanent_addr, size, ref_reg);
153 /** @brief Restore a region from a snapshot
155 * If we are using per page snapshots, it is possible to use the reference
156 * region in order to do an incremental restoration of the region: the
157 * softclean pages which are shared between the two snapshots do not need
160 * @param reg Target region
161 * @param reg_reg Current region (if not NULL), used for lazy per page restoration
163 static void MC_region_restore(mc_mem_region_t region, mc_mem_region_t ref_region)
165 switch(region->storage_type) {
166 case MC_REGION_STORAGE_TYPE_NONE:
168 xbt_die("Storage type not supported");
171 case MC_REGION_STORAGE_TYPE_FLAT:
172 MC_process_write(&mc_model_checker->process, region->flat.data,
173 region->permanent_addr, region->size);
176 case MC_REGION_STORAGE_TYPE_CHUNKED:
177 mc_region_restore_sparse(&mc_model_checker->process, region, ref_region);
180 case MC_REGION_STORAGE_TYPE_PRIVATIZED:
182 bool has_ref_regions = ref_region &&
183 ref_region->storage_type == MC_REGION_STORAGE_TYPE_PRIVATIZED;
184 size_t process_count = region->privatized.regions_count;
185 for (size_t i = 0; i < process_count; i++) {
186 MC_region_restore(region->privatized.regions[i],
187 has_ref_regions ? ref_region->privatized.regions[i] : NULL);
194 static mc_mem_region_t MC_region_new_privatized(
195 mc_region_type_t region_type, void *start_addr, void* permanent_addr, size_t size,
196 mc_mem_region_t ref_reg)
198 size_t process_count = MC_smpi_process_count();
199 mc_mem_region_t region = xbt_new(s_mc_mem_region_t, 1);
200 region->region_type = region_type;
201 region->storage_type = MC_REGION_STORAGE_TYPE_PRIVATIZED;
202 region->start_addr = start_addr;
203 region->permanent_addr = permanent_addr;
205 region->privatized.regions_count = process_count;
206 region->privatized.regions = xbt_new(mc_mem_region_t, process_count);
208 // Read smpi_privatisation_regions from MCed:
209 smpi_privatisation_region_t remote_smpi_privatisation_regions;
210 MC_process_read_variable(&mc_model_checker->process,
211 "smpi_privatisation_regions",
212 &remote_smpi_privatisation_regions, sizeof(remote_smpi_privatisation_regions));
213 s_smpi_privatisation_region_t privatisation_regions[process_count];
214 MC_process_read_simple(&mc_model_checker->process, &privatisation_regions,
215 remote_smpi_privatisation_regions, sizeof(privatisation_regions));
217 for (size_t i = 0; i < process_count; i++) {
218 mc_mem_region_t ref_subreg = NULL;
219 if (ref_reg && ref_reg->storage_type == MC_REGION_STORAGE_TYPE_PRIVATIZED)
220 ref_subreg = ref_reg->privatized.regions[i];
221 region->privatized.regions[i] =
222 MC_region_new(region_type, start_addr,
223 privatisation_regions[i].address, size,
230 static void MC_snapshot_add_region(int index, mc_snapshot_t snapshot, mc_region_type_t type,
231 mc_object_info_t object_info,
232 void *start_addr, void* permanent_addr, size_t size)
234 if (type == MC_REGION_TYPE_DATA)
235 xbt_assert(object_info, "Missing object info for object.");
236 else if (type == MC_REGION_TYPE_HEAP)
237 xbt_assert(!object_info, "Unexpected object info for heap region.");
239 mc_mem_region_t ref_reg = NULL;
240 if (mc_model_checker->parent_snapshot)
241 ref_reg = mc_model_checker->parent_snapshot->snapshot_regions[index];
243 mc_mem_region_t region;
244 const bool privatization_aware = MC_object_info_is_privatized(object_info);
245 if (privatization_aware && MC_smpi_process_count())
246 region = MC_region_new_privatized(type, start_addr, permanent_addr, size, ref_reg);
248 region = MC_region_new(type, start_addr, permanent_addr, size, ref_reg);
250 region->object_info = object_info;
251 snapshot->snapshot_regions[index] = region;
255 static void MC_get_memory_regions(mc_process_t process, mc_snapshot_t snapshot)
257 const size_t n = process->object_infos_size;
258 snapshot->snapshot_regions_count = n + 1;
259 snapshot->snapshot_regions = xbt_new0(mc_mem_region_t, n + 1);
261 for (size_t i = 0; i!=n; ++i) {
262 mc_object_info_t object_info = process->object_infos[i];
263 MC_snapshot_add_region(i, snapshot, MC_REGION_TYPE_DATA, object_info,
264 object_info->start_rw, object_info->start_rw,
265 object_info->end_rw - object_info->start_rw);
268 xbt_mheap_t heap = MC_process_get_heap(process);
269 void *start_heap = heap->base;
270 void *end_heap = heap->breakval;
272 MC_snapshot_add_region(n, snapshot, MC_REGION_TYPE_HEAP, NULL,
273 start_heap, start_heap,
274 (char *) end_heap - (char *) start_heap);
275 snapshot->heap_bytes_used = mmalloc_get_bytes_used_remote(
277 MC_process_get_malloc_info(process));
280 if (smpi_privatize_global_variables && MC_smpi_process_count()) {
281 // FIXME, cross-process
282 snapshot->privatization_index = smpi_loaded_page;
286 snapshot->privatization_index = MC_PROCESS_INDEX_MISSING;
290 /** \brief Fills the position of the segments (executable, read-only, read/write).
292 * `dl_iterate_phdr` would be more robust but would not work in cross-process.
294 void MC_find_object_address(memory_map_t maps, mc_object_info_t result)
298 const char *name = basename(result->file_name);
299 while (i < maps->mapsize) {
300 reg = maps->regions[i];
301 if (maps->regions[i].pathname == NULL
302 || strcmp(basename(maps->regions[i].pathname), name)) {
304 } else if ((reg.prot & PROT_WRITE)) {
305 xbt_assert(!result->start_rw,
306 "Multiple read-write segments for %s, not supported",
307 maps->regions[i].pathname);
308 result->start_rw = reg.start_addr;
309 result->end_rw = reg.end_addr;
310 // .bss is usually after the .data:
311 s_map_region_t *next = &(maps->regions[i + 1]);
312 if (next->pathname == NULL && (next->prot & PROT_WRITE)
313 && next->start_addr == reg.end_addr) {
314 result->end_rw = maps->regions[i + 1].end_addr;
316 } else if ((reg.prot & PROT_READ) && (reg.prot & PROT_EXEC)) {
317 xbt_assert(!result->start_exec,
318 "Multiple executable segments for %s, not supported",
319 maps->regions[i].pathname);
320 result->start_exec = reg.start_addr;
321 result->end_exec = reg.end_addr;
322 } else if ((reg.prot & PROT_READ) && !(reg.prot & PROT_EXEC)) {
323 xbt_assert(!result->start_ro,
324 "Multiple read only segments for %s, not supported",
325 maps->regions[i].pathname);
326 result->start_ro = reg.start_addr;
327 result->end_ro = reg.end_addr;
332 result->start = result->start_rw;
333 if ((const void*) result->start_ro > result->start)
334 result->start = result->start_ro;
335 if ((const void*) result->start_exec > result->start)
336 result->start = result->start_exec;
338 result->end = result->end_rw;
339 if (result->end_ro && (const void*) result->end_ro < result->end)
340 result->end = result->end_ro;
341 if (result->end_exec && (const void*) result->end_exec > result->end)
342 result->end = result->end_exec;
344 xbt_assert(result->file_name);
345 xbt_assert(result->start_rw);
346 xbt_assert(result->start_exec);
349 /************************************* Take Snapshot ************************************/
350 /****************************************************************************************/
352 /** \brief Checks whether the variable is in scope for a given IP.
354 * A variable may be defined only from a given value of IP.
356 * \param var Variable description
357 * \param frame Scope description
358 * \param ip Instruction pointer
359 * \return true if the variable is valid
361 static bool mc_valid_variable(dw_variable_t var, dw_frame_t scope,
364 // The variable is not yet valid:
365 if ((const void *) ((const char *) scope->low_pc + var->start_scope) > ip)
371 static void mc_fill_local_variables_values(mc_stack_frame_t stack_frame,
372 dw_frame_t scope, int process_index, xbt_dynar_t result)
374 mc_process_t process = &mc_model_checker->process;
376 void *ip = (void *) stack_frame->ip;
377 if (ip < scope->low_pc || ip >= scope->high_pc)
381 dw_variable_t current_variable;
382 xbt_dynar_foreach(scope->variables, cursor, current_variable) {
384 if (!mc_valid_variable(current_variable, scope, (void *) stack_frame->ip))
388 // FIXME, get rid of `region_type`
389 if ((long) stack_frame->ip > (long) process->libsimgrid_info->start_exec)
394 local_variable_t new_var = xbt_new0(s_local_variable_t, 1);
395 new_var->subprogram = stack_frame->frame;
396 new_var->ip = stack_frame->ip;
397 new_var->name = xbt_strdup(current_variable->name);
398 new_var->type = current_variable->type;
399 new_var->region = region_type;
401 if (current_variable->address != NULL) {
402 new_var->address = current_variable->address;
403 } else if (current_variable->locations.size != 0) {
404 s_mc_location_t location;
405 // FIXME, cross-process support
406 mc_dwarf_resolve_locations(&location, ¤t_variable->locations,
407 current_variable->object_info,
408 &(stack_frame->unw_cursor),
409 (void *) stack_frame->frame_base,
410 NULL, process_index);
412 switch(mc_get_location_type(&location)) {
413 case MC_LOCATION_TYPE_ADDRESS:
414 new_var->address = location.memory_location;
416 case MC_LOCATION_TYPE_REGISTER:
418 xbt_die("Cannot handle non-address variable");
422 xbt_die("No address");
425 xbt_dynar_push(result, &new_var);
428 // Recursive processing of nested scopes:
429 dw_frame_t nested_scope = NULL;
430 xbt_dynar_foreach(scope->scopes, cursor, nested_scope) {
431 mc_fill_local_variables_values(stack_frame, nested_scope, process_index, result);
435 static xbt_dynar_t MC_get_local_variables_values(xbt_dynar_t stack_frames, int process_index)
438 unsigned cursor1 = 0;
439 mc_stack_frame_t stack_frame;
440 xbt_dynar_t variables =
441 xbt_dynar_new(sizeof(local_variable_t), local_variable_free_voidp);
443 xbt_dynar_foreach(stack_frames, cursor1, stack_frame) {
444 mc_fill_local_variables_values(stack_frame, stack_frame->frame, process_index, variables);
450 static void MC_stack_frame_free_voipd(void *s)
452 mc_stack_frame_t stack_frame = *(mc_stack_frame_t *) s;
454 xbt_free(stack_frame->frame_name);
455 xbt_free(stack_frame);
459 static xbt_dynar_t MC_unwind_stack_frames(mc_unw_context_t stack_context)
461 mc_process_t process = &mc_model_checker->process;
463 xbt_dynar_new(sizeof(mc_stack_frame_t), MC_stack_frame_free_voipd);
467 // TODO, check condition check (unw_init_local==0 means end of frame)
468 if (mc_unw_init_cursor(&c, stack_context) != 0) {
470 xbt_die("Could not initialize stack unwinding");
475 mc_stack_frame_t stack_frame = xbt_new(s_mc_stack_frame_t, 1);
476 xbt_dynar_push(result, &stack_frame);
478 stack_frame->unw_cursor = c;
482 unw_get_reg(&c, UNW_REG_IP, &ip);
483 unw_get_reg(&c, UNW_REG_SP, &sp);
485 stack_frame->ip = ip;
486 stack_frame->sp = sp;
488 // TODO, use real addresses in frame_t instead of fixing it here
490 dw_frame_t frame = MC_process_find_function(process, (void *) ip);
491 stack_frame->frame = frame;
494 stack_frame->frame_name = xbt_strdup(frame->name);
495 stack_frame->frame_base =
496 (unw_word_t) mc_find_frame_base(frame, frame->object_info, &c);
498 stack_frame->frame_base = 0;
499 stack_frame->frame_name = NULL;
502 /* Stop before context switch with maestro */
503 if (frame != NULL && frame->name != NULL
504 && !strcmp(frame->name, "smx_ctx_sysv_wrapper"))
507 int ret = unw_step(&c);
509 xbt_die("Unexpected end of stack.");
510 } else if (ret < 0) {
511 xbt_die("Error while unwinding stack");
515 if (xbt_dynar_length(result) == 0) {
516 XBT_INFO("unw_init_local failed");
523 static xbt_dynar_t MC_take_snapshot_stacks(mc_snapshot_t * snapshot)
527 xbt_dynar_new(sizeof(s_mc_snapshot_stack_t),
528 MC_snapshot_stack_free_voidp);
530 unsigned int cursor = 0;
531 stack_region_t current_stack;
533 // FIXME, cross-process support (stack_areas)
534 xbt_dynar_foreach(stacks_areas, cursor, current_stack) {
535 mc_snapshot_stack_t st = xbt_new(s_mc_snapshot_stack_t, 1);
537 unw_context_t* original_context = (unw_context_t*) current_stack->context;
539 st->context = xbt_new0(s_mc_unw_context_t, 1);
540 if (mc_unw_init_context(st->context, &mc_model_checker->process,
541 original_context) < 0) {
542 xbt_die("Could not initialise the libunwind context.");
545 st->stack_frames = MC_unwind_stack_frames(st->context);
546 st->local_variables = MC_get_local_variables_values(st->stack_frames, current_stack->process_index);
547 st->process_index = current_stack->process_index;
549 unw_word_t sp = xbt_dynar_get_as(st->stack_frames, 0, mc_stack_frame_t)->sp;
551 xbt_dynar_push(res, &st);
552 (*snapshot)->stack_sizes =
553 xbt_realloc((*snapshot)->stack_sizes, (cursor + 1) * sizeof(size_t));
554 (*snapshot)->stack_sizes[cursor] =
555 (char*) current_stack->address + current_stack->size - (char*) sp;
562 static xbt_dynar_t MC_take_snapshot_ignore()
565 if (mc_heap_comparison_ignore == NULL)
569 xbt_dynar_new(sizeof(mc_heap_ignore_region_t),
570 heap_ignore_region_free_voidp);
572 unsigned int cursor = 0;
573 mc_heap_ignore_region_t current_region;
575 xbt_dynar_foreach(mc_heap_comparison_ignore, cursor, current_region) {
576 mc_heap_ignore_region_t new_region = NULL;
577 new_region = xbt_new0(s_mc_heap_ignore_region_t, 1);
578 new_region->address = current_region->address;
579 new_region->size = current_region->size;
580 new_region->block = current_region->block;
581 new_region->fragment = current_region->fragment;
582 xbt_dynar_push(cpy, &new_region);
589 static void mc_free_snapshot_ignored_data_pvoid(void* data) {
590 mc_snapshot_ignored_data_t ignored_data = (mc_snapshot_ignored_data_t) data;
591 free(ignored_data->data);
594 static void MC_snapshot_handle_ignore(mc_snapshot_t snapshot)
596 xbt_assert(snapshot->process);
597 snapshot->ignored_data = xbt_dynar_new(sizeof(s_mc_snapshot_ignored_data_t), mc_free_snapshot_ignored_data_pvoid);
600 unsigned int cursor = 0;
601 mc_checkpoint_ignore_region_t region;
602 xbt_dynar_foreach (mc_model_checker->process.checkpoint_ignore, cursor, region) {
603 s_mc_snapshot_ignored_data_t ignored_data;
604 ignored_data.start = region->addr;
605 ignored_data.size = region->size;
606 ignored_data.data = malloc(region->size);
607 // TODO, we should do this once per privatization segment:
608 MC_process_read(snapshot->process,
609 MC_ADDRESS_SPACE_READ_FLAGS_NONE,
610 ignored_data.data, region->addr, region->size, MC_PROCESS_INDEX_DISABLED);
611 xbt_dynar_push(snapshot->ignored_data, &ignored_data);
615 xbt_dynar_foreach (mc_model_checker->process.checkpoint_ignore, cursor, region) {
616 MC_process_clear_memory(snapshot->process, region->addr, region->size);
621 static void MC_snapshot_ignore_restore(mc_snapshot_t snapshot)
623 unsigned int cursor = 0;
624 s_mc_snapshot_ignored_data_t ignored_data;
625 xbt_dynar_foreach (snapshot->ignored_data, cursor, ignored_data) {
626 MC_process_write(snapshot->process,
627 ignored_data.data, ignored_data.start, ignored_data.size);
631 /** @brief Can we remove this snapshot?
633 * Some snapshots cannot be removed (yet) because we need them
638 int mc_important_snapshot(mc_snapshot_t snapshot)
640 // We need this snapshot in order to know which
641 // pages needs to be stored in the next snapshot.
642 // This field is only non-NULL when using soft-dirty
644 if (snapshot == mc_model_checker->parent_snapshot)
650 static void MC_get_current_fd(mc_snapshot_t snapshot)
653 snapshot->total_fd = 0;
655 const size_t fd_dir_path_size = 20;
656 char fd_dir_path[fd_dir_path_size];
657 if (snprintf(fd_dir_path, fd_dir_path_size,
658 "/proc/%lli/fd", (long long int) snapshot->process->pid) > fd_dir_path_size)
659 xbt_die("Unexpected buffer is too small for fd_dir_path");
661 DIR* fd_dir = opendir(fd_dir_path);
663 xbt_die("Cannot open directory '/proc/self/fd'\n");
666 struct dirent* fd_number;
667 while ((fd_number = readdir(fd_dir))) {
669 int fd_value = atoi(fd_number->d_name);
674 const size_t source_size = 25;
676 if (snprintf(source, source_size, "/proc/%lli/fd/%s",
677 (long long int) snapshot->process->pid, fd_number->d_name) > source_size)
678 xbt_die("Unexpected buffer is too small for fd %s", fd_number->d_name);
680 const size_t link_size = 200;
682 int res = readlink(source, link, link_size);
684 xbt_die("Could not read link for %s", source);
687 xbt_die("Buffer to small for link of %s", source);
691 if(smpi_is_privatisation_file(link))
694 // This is (probably) the DIR* we are reading:
695 // TODO, read all the file entries at once and close the DIR.*
696 if(strcmp(fd_dir_path, link) == 0)
699 // We don't handle them.
700 // It does not mean we should silently ignore them however.
701 if (strncmp(link, "pipe:", 5) == 0 || strncmp(link, "socket:", 7) == 0)
704 // If dot_output enabled, do not handle the corresponding file
705 if (dot_output != NULL && strcmp(basename(link), _sg_mc_dot_output_file) == 0)
708 // This is probably a shared memory used by lttng-ust:
709 if(strncmp("/dev/shm/ust-shm-tmp-", link, 21)==0)
712 // Add an entry for this FD in the snapshot:
713 fd_infos_t fd = xbt_new0(s_fd_infos_t, 1);
714 fd->filename = strdup(link);
715 fd->number = fd_value;
716 fd->flags = fcntl(fd_value, F_GETFL) | fcntl(fd_value, F_GETFD) ;
717 fd->current_position = lseek(fd_value, 0, SEEK_CUR);
718 snapshot->current_fd = xbt_realloc(snapshot->current_fd, (total_fd + 1) * sizeof(fd_infos_t));
719 snapshot->current_fd[total_fd] = fd;
723 snapshot->total_fd = total_fd;
727 static s_mc_address_space_class_t mc_snapshot_class = {
728 .read = (void*) &MC_snapshot_read
731 mc_snapshot_t MC_take_snapshot(int num_state)
733 mc_process_t mc_process = &mc_model_checker->process;
734 mc_snapshot_t snapshot = xbt_new0(s_mc_snapshot_t, 1);
735 snapshot->process = mc_process;
736 snapshot->address_space.address_space_class = &mc_snapshot_class;
738 snapshot->enabled_processes = xbt_dynar_new(sizeof(int), NULL);
740 smx_process_t process;
741 MC_EACH_SIMIX_PROCESS(process,
742 xbt_dynar_push_as(snapshot->enabled_processes, int, (int)process->pid));
744 MC_snapshot_handle_ignore(snapshot);
746 if (_sg_mc_snapshot_fds)
747 MC_get_current_fd(snapshot);
749 const bool use_soft_dirty = _sg_mc_sparse_checkpoint
751 && MC_process_is_self(mc_process);
753 /* Save the std heap and the writable mapped pages of libsimgrid and binary */
754 MC_get_memory_regions(mc_process, snapshot);
756 mc_softdirty_reset();
758 snapshot->to_ignore = MC_take_snapshot_ignore();
760 if (_sg_mc_visited > 0 || strcmp(_sg_mc_property_file, "")) {
762 MC_take_snapshot_stacks(&snapshot);
763 if (_sg_mc_hash && snapshot->stacks != NULL) {
764 snapshot->hash = mc_hash_processes_state(num_state, snapshot->stacks);
772 MC_snapshot_ignore_restore(snapshot);
774 mc_model_checker->parent_snapshot = snapshot;
779 void MC_restore_snapshot_regions(mc_snapshot_t snapshot)
781 mc_snapshot_t parent_snapshot = mc_model_checker->parent_snapshot;
783 const size_t n = snapshot->snapshot_regions_count;
784 for (size_t i = 0; i < n; i++) {
785 // For privatized, variables we decided it was not necessary to take the snapshot:
786 if (snapshot->snapshot_regions[i])
787 MC_region_restore(snapshot->snapshot_regions[i],
788 parent_snapshot ? parent_snapshot->snapshot_regions[i] : NULL);
792 if(snapshot->privatization_index >= 0) {
793 // We just rewrote the global variables.
794 // The privatisation segment SMPI thinks
795 // is mapped might be inconsistent with the segment which
796 // is really mapped in memory (kernel state).
797 // We ask politely SMPI to map the segment anyway,
798 // even if it thinks it is the current one:
799 smpi_really_switch_data_segment(snapshot->privatization_index);
805 void MC_restore_snapshot_fds(mc_snapshot_t snapshot)
807 if (mc_mode == MC_MODE_SERVER)
808 xbt_die("FD snapshot not implemented in client/server mode.");
812 for(i=0; i < snapshot->total_fd; i++){
814 new_fd = open(snapshot->current_fd[i]->filename, snapshot->current_fd[i]->flags);
816 xbt_die("Could not reopen the file %s fo restoring the file descriptor",
817 snapshot->current_fd[i]->filename);
819 if(new_fd != -1 && new_fd != snapshot->current_fd[i]->number){
820 dup2(new_fd, snapshot->current_fd[i]->number);
821 //fprintf(stderr, "%p\n", fdopen(snapshot->current_fd[i]->number, "rw"));
824 lseek(snapshot->current_fd[i]->number, snapshot->current_fd[i]->current_position, SEEK_SET);
828 void MC_restore_snapshot(mc_snapshot_t snapshot)
830 const bool use_soft_dirty = _sg_mc_sparse_checkpoint
832 && MC_process_is_self(&mc_model_checker->process);
834 MC_restore_snapshot_regions(snapshot);
835 if (_sg_mc_snapshot_fds)
836 MC_restore_snapshot_fds(snapshot);
837 if (use_soft_dirty) {
838 mc_softdirty_reset();
840 MC_snapshot_ignore_restore(snapshot);
841 if (use_soft_dirty) {
842 mc_model_checker->parent_snapshot = snapshot;
845 mc_model_checker->process.cache_flags = 0;
848 mc_snapshot_t simcall_HANDLER_mc_snapshot(smx_simcall_t simcall)
850 return MC_take_snapshot(1);