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"
39 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_checkpoint, mc,
40 "Logging specific to mc_checkpoint");
42 /************************************ Free functions **************************************/
43 /*****************************************************************************************/
45 static void MC_snapshot_stack_free(mc_snapshot_stack_t s)
48 xbt_dynar_free(&(s->local_variables));
49 xbt_dynar_free(&(s->stack_frames));
50 mc_unw_destroy_context(s->context);
56 static void MC_snapshot_stack_free_voidp(void *s)
58 mc_snapshot_stack_t stack = (mc_snapshot_stack_t) * (void **) s;
59 MC_snapshot_stack_free(stack);
62 static void local_variable_free(local_variable_t v)
68 static void local_variable_free_voidp(void *v)
70 local_variable_free((local_variable_t) * (void **) v);
73 void MC_region_destroy(mc_mem_region_t region)
77 switch(region->storage_type) {
78 case MC_REGION_STORAGE_TYPE_NONE:
80 case MC_REGION_STORAGE_TYPE_FLAT:
81 xbt_free(region->flat.data);
83 case MC_REGION_STORAGE_TYPE_CHUNKED:
84 mc_free_page_snapshot_region(region->chunked.page_numbers, mc_page_count(region->size));
85 xbt_free(region->chunked.page_numbers);
87 case MC_REGION_STORAGE_TYPE_PRIVATIZED:
89 size_t regions_count = region->privatized.regions_count;
90 for (size_t i=0; i!=regions_count; ++i) {
91 MC_region_destroy(region->privatized.regions[i]);
93 free(region->privatized.regions);
100 void MC_free_snapshot(mc_snapshot_t snapshot)
102 for (size_t i = 0; i < snapshot->snapshot_regions_count; i++) {
103 MC_region_destroy(snapshot->snapshot_regions[i]);
105 xbt_free(snapshot->snapshot_regions);
106 xbt_free(snapshot->stack_sizes);
107 xbt_dynar_free(&(snapshot->stacks));
108 xbt_dynar_free(&(snapshot->to_ignore));
109 xbt_dynar_free(&snapshot->ignored_data);
113 /******************************* Snapshot regions ********************************/
114 /*********************************************************************************/
116 static mc_mem_region_t mc_region_new_dense(
117 mc_region_type_t region_type,
118 void *start_addr, void* permanent_addr, size_t size, mc_mem_region_t ref_reg)
120 mc_mem_region_t region = xbt_new(s_mc_mem_region_t, 1);
121 region->region_type = region_type;
122 region->storage_type = MC_REGION_STORAGE_TYPE_FLAT;
123 region->start_addr = start_addr;
124 region->permanent_addr = permanent_addr;
126 region->flat.data = xbt_malloc(size);
127 MC_process_read(&mc_model_checker->process, MC_ADDRESS_SPACE_READ_FLAGS_NONE,
128 region->flat.data, permanent_addr, size,
129 MC_PROCESS_INDEX_DISABLED);
130 XBT_DEBUG("New region : type : %d, data : %p (real addr %p), size : %zu",
131 region_type, region->flat.data, permanent_addr, size);
135 /** @brief Take a snapshot of a given region
138 * @param start_addr Address of the region in the simulated process
139 * @param permanent_addr Permanent address of this data (for privatized variables, this is the virtual address of the privatized mapping)
140 * @param size Size of the data*
141 * @param ref_reg Reference corresponding region
143 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)
145 if (_sg_mc_sparse_checkpoint) {
146 return mc_region_new_sparse(type, start_addr, permanent_addr, size, ref_reg);
148 return mc_region_new_dense(type, start_addr, permanent_addr, size, ref_reg);
152 /** @brief Restore a region from a snapshot
154 * If we are using per page snapshots, it is possible to use the reference
155 * region in order to do an incremental restoration of the region: the
156 * softclean pages which are shared between the two snapshots do not need
159 * @param reg Target region
160 * @param reg_reg Current region (if not NULL), used for lazy per page restoration
162 static void MC_region_restore(mc_mem_region_t region, mc_mem_region_t ref_region)
164 switch(region->storage_type) {
165 case MC_REGION_STORAGE_TYPE_NONE:
167 xbt_die("Storage type not supported");
170 case MC_REGION_STORAGE_TYPE_FLAT:
171 MC_process_write(&mc_model_checker->process, region->flat.data,
172 region->permanent_addr, region->size);
175 case MC_REGION_STORAGE_TYPE_CHUNKED:
176 mc_region_restore_sparse(&mc_model_checker->process, region, ref_region);
179 case MC_REGION_STORAGE_TYPE_PRIVATIZED:
181 bool has_ref_regions = ref_region &&
182 ref_region->storage_type == MC_REGION_STORAGE_TYPE_PRIVATIZED;
183 size_t process_count = region->privatized.regions_count;
184 for (size_t i = 0; i < process_count; i++) {
185 MC_region_restore(region->privatized.regions[i],
186 has_ref_regions ? ref_region->privatized.regions[i] : NULL);
193 // FIXME, multiple privatisation regions
194 // FIXME, cross-process
196 void* MC_privatization_address(mc_process_t process, int process_index)
198 xbt_assert(process_index >= 0);
199 return smpi_privatisation_regions[process_index].address;
202 static mc_mem_region_t MC_region_new_privatized(
203 mc_region_type_t region_type, void *start_addr, void* permanent_addr, size_t size,
204 mc_mem_region_t ref_reg)
206 size_t process_count = smpi_process_count();
207 mc_mem_region_t region = xbt_new(s_mc_mem_region_t, 1);
208 region->region_type = region_type;
209 region->storage_type = MC_REGION_STORAGE_TYPE_PRIVATIZED;
210 region->start_addr = start_addr;
211 region->permanent_addr = permanent_addr;
213 region->privatized.regions_count = process_count;
214 region->privatized.regions = xbt_new(mc_mem_region_t, process_count);
216 for (size_t i = 0; i < process_count; i++) {
217 mc_mem_region_t ref_subreg = NULL;
218 if (ref_reg && ref_reg->storage_type == MC_REGION_STORAGE_TYPE_PRIVATIZED)
219 ref_subreg = ref_reg->privatized.regions[i];
220 region->privatized.regions[i] =
221 MC_region_new(region_type, start_addr,
222 MC_privatization_address(&mc_model_checker->process, i), size,
229 static void MC_snapshot_add_region(int index, mc_snapshot_t snapshot, mc_region_type_t type,
230 mc_object_info_t object_info,
231 void *start_addr, void* permanent_addr, size_t size)
233 if (type == MC_REGION_TYPE_DATA)
234 xbt_assert(object_info, "Missing object info for object.");
235 else if (type == MC_REGION_TYPE_HEAP)
236 xbt_assert(!object_info, "Unexpected object info for heap region.");
238 mc_mem_region_t ref_reg = NULL;
239 if (mc_model_checker->parent_snapshot)
240 ref_reg = mc_model_checker->parent_snapshot->snapshot_regions[index];
242 mc_mem_region_t region;
243 const bool privatization_aware = MC_object_info_is_privatized(object_info);
244 if (privatization_aware && smpi_process_count())
245 region = MC_region_new_privatized(type, start_addr, permanent_addr, size, ref_reg);
247 region = MC_region_new(type, start_addr, permanent_addr, size, ref_reg);
249 region->object_info = object_info;
250 snapshot->snapshot_regions[index] = region;
254 static void MC_get_memory_regions(mc_process_t process, mc_snapshot_t snapshot)
256 const size_t n = process->object_infos_size;
257 snapshot->snapshot_regions_count = n + 1;
258 snapshot->snapshot_regions = xbt_new0(mc_mem_region_t, n + 1);
260 for (size_t i = 0; i!=n; ++i) {
261 mc_object_info_t object_info = process->object_infos[i];
262 MC_snapshot_add_region(i, snapshot, MC_REGION_TYPE_DATA, object_info,
263 object_info->start_rw, object_info->start_rw,
264 object_info->end_rw - object_info->start_rw);
267 xbt_mheap_t heap = MC_process_get_heap(process);
268 void *start_heap = heap->base;
269 void *end_heap = heap->breakval;
271 MC_snapshot_add_region(n, snapshot, MC_REGION_TYPE_HEAP, NULL,
272 start_heap, start_heap,
273 (char *) end_heap - (char *) start_heap);
274 snapshot->heap_bytes_used = mmalloc_get_bytes_used_remote(
276 MC_process_get_malloc_info(process));
279 if (smpi_privatize_global_variables && smpi_process_count()) {
280 // FIXME, cross-process
281 snapshot->privatization_index = smpi_loaded_page;
285 snapshot->privatization_index = MC_PROCESS_INDEX_MISSING;
289 /** \brief Fills the position of the segments (executable, read-only, read/write).
291 * `dl_iterate_phdr` would be more robust but would not work in cross-process.
293 void MC_find_object_address(memory_map_t maps, mc_object_info_t result)
297 const char *name = basename(result->file_name);
298 while (i < maps->mapsize) {
299 reg = maps->regions[i];
300 if (maps->regions[i].pathname == NULL
301 || strcmp(basename(maps->regions[i].pathname), name)) {
303 } else if ((reg.prot & PROT_WRITE)) {
304 xbt_assert(!result->start_rw,
305 "Multiple read-write segments for %s, not supported",
306 maps->regions[i].pathname);
307 result->start_rw = reg.start_addr;
308 result->end_rw = reg.end_addr;
309 // .bss is usually after the .data:
310 s_map_region_t *next = &(maps->regions[i + 1]);
311 if (next->pathname == NULL && (next->prot & PROT_WRITE)
312 && next->start_addr == reg.end_addr) {
313 result->end_rw = maps->regions[i + 1].end_addr;
315 } else if ((reg.prot & PROT_READ) && (reg.prot & PROT_EXEC)) {
316 xbt_assert(!result->start_exec,
317 "Multiple executable segments for %s, not supported",
318 maps->regions[i].pathname);
319 result->start_exec = reg.start_addr;
320 result->end_exec = reg.end_addr;
321 } else if ((reg.prot & PROT_READ) && !(reg.prot & PROT_EXEC)) {
322 xbt_assert(!result->start_ro,
323 "Multiple read only segments for %s, not supported",
324 maps->regions[i].pathname);
325 result->start_ro = reg.start_addr;
326 result->end_ro = reg.end_addr;
331 result->start = result->start_rw;
332 if ((const void*) result->start_ro > result->start)
333 result->start = result->start_ro;
334 if ((const void*) result->start_exec > result->start)
335 result->start = result->start_exec;
337 result->end = result->end_rw;
338 if (result->end_ro && (const void*) result->end_ro < result->end)
339 result->end = result->end_ro;
340 if (result->end_exec && (const void*) result->end_exec > result->end)
341 result->end = result->end_exec;
343 xbt_assert(result->file_name);
344 xbt_assert(result->start_rw);
345 xbt_assert(result->start_exec);
348 /************************************* Take Snapshot ************************************/
349 /****************************************************************************************/
351 /** \brief Checks whether the variable is in scope for a given IP.
353 * A variable may be defined only from a given value of IP.
355 * \param var Variable description
356 * \param frame Scope description
357 * \param ip Instruction pointer
358 * \return true if the variable is valid
360 static bool mc_valid_variable(dw_variable_t var, dw_frame_t scope,
363 // The variable is not yet valid:
364 if ((const void *) ((const char *) scope->low_pc + var->start_scope) > ip)
370 static void mc_fill_local_variables_values(mc_stack_frame_t stack_frame,
371 dw_frame_t scope, int process_index, xbt_dynar_t result)
373 mc_process_t process = &mc_model_checker->process;
375 void *ip = (void *) stack_frame->ip;
376 if (ip < scope->low_pc || ip >= scope->high_pc)
380 dw_variable_t current_variable;
381 xbt_dynar_foreach(scope->variables, cursor, current_variable) {
383 if (!mc_valid_variable(current_variable, scope, (void *) stack_frame->ip))
387 // FIXME, get rid of `region_type`
388 if ((long) stack_frame->ip > (long) process->libsimgrid_info->start_exec)
393 local_variable_t new_var = xbt_new0(s_local_variable_t, 1);
394 new_var->subprogram = stack_frame->frame;
395 new_var->ip = stack_frame->ip;
396 new_var->name = xbt_strdup(current_variable->name);
397 new_var->type = current_variable->type;
398 new_var->region = region_type;
400 if (current_variable->address != NULL) {
401 new_var->address = current_variable->address;
402 } else if (current_variable->locations.size != 0) {
403 s_mc_location_t location;
404 // FIXME, cross-process support
405 mc_dwarf_resolve_locations(&location, ¤t_variable->locations,
406 current_variable->object_info,
407 &(stack_frame->unw_cursor),
408 (void *) stack_frame->frame_base,
409 NULL, process_index);
411 switch(mc_get_location_type(&location)) {
412 case MC_LOCATION_TYPE_ADDRESS:
413 new_var->address = location.memory_location;
415 case MC_LOCATION_TYPE_REGISTER:
417 xbt_die("Cannot handle non-address variable");
421 xbt_die("No address");
424 xbt_dynar_push(result, &new_var);
427 // Recursive processing of nested scopes:
428 dw_frame_t nested_scope = NULL;
429 xbt_dynar_foreach(scope->scopes, cursor, nested_scope) {
430 mc_fill_local_variables_values(stack_frame, nested_scope, process_index, result);
434 static xbt_dynar_t MC_get_local_variables_values(xbt_dynar_t stack_frames, int process_index)
437 unsigned cursor1 = 0;
438 mc_stack_frame_t stack_frame;
439 xbt_dynar_t variables =
440 xbt_dynar_new(sizeof(local_variable_t), local_variable_free_voidp);
442 xbt_dynar_foreach(stack_frames, cursor1, stack_frame) {
443 mc_fill_local_variables_values(stack_frame, stack_frame->frame, process_index, variables);
449 static void MC_stack_frame_free_voipd(void *s)
451 mc_stack_frame_t stack_frame = *(mc_stack_frame_t *) s;
453 xbt_free(stack_frame->frame_name);
454 xbt_free(stack_frame);
458 static xbt_dynar_t MC_unwind_stack_frames(mc_unw_context_t stack_context)
460 mc_process_t process = &mc_model_checker->process;
462 xbt_dynar_new(sizeof(mc_stack_frame_t), MC_stack_frame_free_voipd);
466 // TODO, check condition check (unw_init_local==0 means end of frame)
467 if (mc_unw_init_cursor(&c, stack_context) != 0) {
469 xbt_die("Could not initialize stack unwinding");
474 mc_stack_frame_t stack_frame = xbt_new(s_mc_stack_frame_t, 1);
475 xbt_dynar_push(result, &stack_frame);
477 stack_frame->unw_cursor = c;
481 unw_get_reg(&c, UNW_REG_IP, &ip);
482 unw_get_reg(&c, UNW_REG_SP, &sp);
484 stack_frame->ip = ip;
485 stack_frame->sp = sp;
487 // TODO, use real addresses in frame_t instead of fixing it here
489 dw_frame_t frame = MC_process_find_function(process, (void *) ip);
490 stack_frame->frame = frame;
493 stack_frame->frame_name = xbt_strdup(frame->name);
494 stack_frame->frame_base =
495 (unw_word_t) mc_find_frame_base(frame, frame->object_info, &c);
497 stack_frame->frame_base = 0;
498 stack_frame->frame_name = NULL;
501 /* Stop before context switch with maestro */
502 if (frame != NULL && frame->name != NULL
503 && !strcmp(frame->name, "smx_ctx_sysv_wrapper"))
506 int ret = unw_step(&c);
508 xbt_die("Unexpected end of stack.");
509 } else if (ret < 0) {
510 xbt_die("Error while unwinding stack");
514 if (xbt_dynar_length(result) == 0) {
515 XBT_INFO("unw_init_local failed");
522 static xbt_dynar_t MC_take_snapshot_stacks(mc_snapshot_t * snapshot)
526 xbt_dynar_new(sizeof(s_mc_snapshot_stack_t),
527 MC_snapshot_stack_free_voidp);
529 unsigned int cursor = 0;
530 stack_region_t current_stack;
532 // FIXME, cross-process support (stack_areas)
533 xbt_dynar_foreach(stacks_areas, cursor, current_stack) {
534 mc_snapshot_stack_t st = xbt_new(s_mc_snapshot_stack_t, 1);
536 unw_context_t* original_context = (unw_context_t*) current_stack->context;
538 st->context = xbt_new0(s_mc_unw_context_t, 1);
539 if (mc_unw_init_context(st->context, &mc_model_checker->process,
540 original_context) < 0) {
541 xbt_die("Could not initialise the libunwind context.");
544 st->stack_frames = MC_unwind_stack_frames(st->context);
545 st->local_variables = MC_get_local_variables_values(st->stack_frames, current_stack->process_index);
546 st->process_index = current_stack->process_index;
548 unw_word_t sp = xbt_dynar_get_as(st->stack_frames, 0, mc_stack_frame_t)->sp;
550 xbt_dynar_push(res, &st);
551 (*snapshot)->stack_sizes =
552 xbt_realloc((*snapshot)->stack_sizes, (cursor + 1) * sizeof(size_t));
553 (*snapshot)->stack_sizes[cursor] =
554 (char*) current_stack->address + current_stack->size - (char*) sp;
561 // FIXME, cross-process support (mc_heap_comparison_ignore)
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 // FIXME, cross-process support (mc_checkpoint_ignore)
603 xbt_dynar_foreach (mc_model_checker->process.checkpoint_ignore, cursor, region) {
604 s_mc_snapshot_ignored_data_t ignored_data;
605 ignored_data.start = region->addr;
606 ignored_data.size = region->size;
607 ignored_data.data = malloc(region->size);
608 // TODO, we should do this once per privatization segment:
609 MC_process_read(snapshot->process,
610 MC_ADDRESS_SPACE_READ_FLAGS_NONE,
611 ignored_data.data, region->addr, region->size, MC_PROCESS_INDEX_DISABLED);
612 xbt_dynar_push(snapshot->ignored_data, &ignored_data);
616 xbt_dynar_foreach (mc_model_checker->process.checkpoint_ignore, cursor, region) {
617 MC_process_clear_memory(snapshot->process, region->addr, region->size);
622 static void MC_snapshot_ignore_restore(mc_snapshot_t snapshot)
624 unsigned int cursor = 0;
625 s_mc_snapshot_ignored_data_t ignored_data;
626 xbt_dynar_foreach (snapshot->ignored_data, cursor, ignored_data) {
627 MC_process_write(snapshot->process,
628 ignored_data.data, ignored_data.start, ignored_data.size);
632 /** @brief Can we remove this snapshot?
634 * Some snapshots cannot be removed (yet) because we need them
639 int mc_important_snapshot(mc_snapshot_t snapshot)
641 // We need this snapshot in order to know which
642 // pages needs to be stored in the next snapshot.
643 // This field is only non-NULL when using soft-dirty
645 if (snapshot == mc_model_checker->parent_snapshot)
651 static void MC_get_current_fd(mc_snapshot_t snapshot)
654 snapshot->total_fd = 0;
656 const size_t fd_dir_path_size = 20;
657 char fd_dir_path[fd_dir_path_size];
658 if (snprintf(fd_dir_path, fd_dir_path_size,
659 "/proc/%lli/fd", (long long int) snapshot->process->pid) > fd_dir_path_size)
660 xbt_die("Unexpected buffer is too small for fd_dir_path");
662 DIR* fd_dir = opendir(fd_dir_path);
664 xbt_die("Cannot open directory '/proc/self/fd'\n");
667 struct dirent* fd_number;
668 while ((fd_number = readdir(fd_dir))) {
670 int fd_value = atoi(fd_number->d_name);
675 const size_t source_size = 25;
677 if (snprintf(source, source_size, "/proc/%lli/fd/%s",
678 (long long int) snapshot->process->pid, fd_number->d_name) > source_size)
679 xbt_die("Unexpected buffer is too small for fd %s", fd_number->d_name);
681 const size_t link_size = 200;
683 int res = readlink(source, link, link_size);
685 xbt_die("Could not read link for %s", source);
688 xbt_die("Buffer to small for link of %s", source);
692 if(smpi_is_privatisation_file(link))
695 // This is (probably) the DIR* we are reading:
696 // TODO, read all the file entries at once and close the DIR.*
697 if(strcmp(fd_dir_path, link) == 0)
700 // We don't handle them.
701 // It does not mean we should silently ignore them however.
702 if (strncmp(link, "pipe:", 5) == 0 || strncmp(link, "socket:", 7) == 0)
705 // If dot_output enabled, do not handle the corresponding file
706 if (dot_output != NULL && strcmp(basename(link), _sg_mc_dot_output_file) == 0)
709 // This is probably a shared memory used by lttng-ust:
710 if(strncmp("/dev/shm/ust-shm-tmp-", link, 21)==0)
713 // Add an entry for this FD in the snapshot:
714 fd_infos_t fd = xbt_new0(s_fd_infos_t, 1);
715 fd->filename = strdup(link);
716 fd->number = fd_value;
717 fd->flags = fcntl(fd_value, F_GETFL) | fcntl(fd_value, F_GETFD) ;
718 fd->current_position = lseek(fd_value, 0, SEEK_CUR);
719 snapshot->current_fd = xbt_realloc(snapshot->current_fd, (total_fd + 1) * sizeof(fd_infos_t));
720 snapshot->current_fd[total_fd] = fd;
724 snapshot->total_fd = total_fd;
728 static s_mc_address_space_class_t mc_snapshot_class = {
729 .read = (void*) &MC_snapshot_read
732 mc_snapshot_t MC_take_snapshot(int num_state)
734 mc_process_t mc_process = &mc_model_checker->process;
735 mc_snapshot_t snapshot = xbt_new0(s_mc_snapshot_t, 1);
736 snapshot->process = mc_process;
737 snapshot->address_space.address_space_class = &mc_snapshot_class;
739 snapshot->enabled_processes = xbt_dynar_new(sizeof(int), NULL);
741 smx_process_t process;
742 MC_EACH_SIMIX_PROCESS(process,
743 xbt_dynar_push_as(snapshot->enabled_processes, int, (int)process->pid));
745 MC_snapshot_handle_ignore(snapshot);
747 if (_sg_mc_snapshot_fds)
748 MC_get_current_fd(snapshot);
750 const bool use_soft_dirty = _sg_mc_sparse_checkpoint
752 && MC_process_is_self(mc_process);
754 /* Save the std heap and the writable mapped pages of libsimgrid and binary */
755 MC_get_memory_regions(mc_process, snapshot);
757 mc_softdirty_reset();
759 snapshot->to_ignore = MC_take_snapshot_ignore();
761 if (_sg_mc_visited > 0 || strcmp(_sg_mc_property_file, "")) {
763 MC_take_snapshot_stacks(&snapshot);
764 if (_sg_mc_hash && snapshot->stacks != NULL) {
765 snapshot->hash = mc_hash_processes_state(num_state, snapshot->stacks);
773 MC_snapshot_ignore_restore(snapshot);
775 mc_model_checker->parent_snapshot = snapshot;
780 void MC_restore_snapshot_regions(mc_snapshot_t snapshot)
782 mc_snapshot_t parent_snapshot = mc_model_checker->parent_snapshot;
784 const size_t n = snapshot->snapshot_regions_count;
785 for (size_t i = 0; i < n; i++) {
786 // For privatized, variables we decided it was not necessary to take the snapshot:
787 if (snapshot->snapshot_regions[i])
788 MC_region_restore(snapshot->snapshot_regions[i],
789 parent_snapshot ? parent_snapshot->snapshot_regions[i] : NULL);
793 if(snapshot->privatization_index >= 0) {
794 // We just rewrote the global variables.
795 // The privatisation segment SMPI thinks
796 // is mapped might be inconsistent with the segment which
797 // is really mapped in memory (kernel state).
798 // We ask politely SMPI to map the segment anyway,
799 // even if it thinks it is the current one:
800 smpi_really_switch_data_segment(snapshot->privatization_index);
806 void MC_restore_snapshot_fds(mc_snapshot_t snapshot)
808 if (mc_mode == MC_MODE_SERVER)
809 xbt_die("FD snapshot not implemented in client/server mode.");
813 for(i=0; i < snapshot->total_fd; i++){
815 new_fd = open(snapshot->current_fd[i]->filename, snapshot->current_fd[i]->flags);
817 xbt_die("Could not reopen the file %s fo restoring the file descriptor",
818 snapshot->current_fd[i]->filename);
820 if(new_fd != -1 && new_fd != snapshot->current_fd[i]->number){
821 dup2(new_fd, snapshot->current_fd[i]->number);
822 //fprintf(stderr, "%p\n", fdopen(snapshot->current_fd[i]->number, "rw"));
825 lseek(snapshot->current_fd[i]->number, snapshot->current_fd[i]->current_position, SEEK_SET);
829 void MC_restore_snapshot(mc_snapshot_t snapshot)
831 const bool use_soft_dirty = _sg_mc_sparse_checkpoint
833 && MC_process_is_self(&mc_model_checker->process);
835 MC_restore_snapshot_regions(snapshot);
836 if (_sg_mc_snapshot_fds)
837 MC_restore_snapshot_fds(snapshot);
838 if (use_soft_dirty) {
839 mc_softdirty_reset();
841 MC_snapshot_ignore_restore(snapshot);
842 if (use_soft_dirty) {
843 mc_model_checker->parent_snapshot = snapshot;
846 mc_model_checker->process.cache_flags = 0;
849 mc_snapshot_t simcall_HANDLER_mc_snapshot(smx_simcall_t simcall)
851 return MC_take_snapshot(1);