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 // snapshot->privatization_index = smpi_loaded_page
282 MC_process_read_variable(&mc_model_checker->process,
283 "smpi_loaded_page", &snapshot->privatization_index,
284 sizeof(snapshot->privatization_index));
288 snapshot->privatization_index = MC_PROCESS_INDEX_MISSING;
292 /** \brief Fills the position of the segments (executable, read-only, read/write).
294 * `dl_iterate_phdr` would be more robust but would not work in cross-process.
296 void MC_find_object_address(memory_map_t maps, mc_object_info_t result)
300 const char *name = basename(result->file_name);
301 while (i < maps->mapsize) {
302 reg = maps->regions[i];
303 if (maps->regions[i].pathname == NULL
304 || strcmp(basename(maps->regions[i].pathname), name)) {
306 } else if ((reg.prot & PROT_WRITE)) {
307 xbt_assert(!result->start_rw,
308 "Multiple read-write segments for %s, not supported",
309 maps->regions[i].pathname);
310 result->start_rw = reg.start_addr;
311 result->end_rw = reg.end_addr;
312 // .bss is usually after the .data:
313 s_map_region_t *next = &(maps->regions[i + 1]);
314 if (next->pathname == NULL && (next->prot & PROT_WRITE)
315 && next->start_addr == reg.end_addr) {
316 result->end_rw = maps->regions[i + 1].end_addr;
318 } else if ((reg.prot & PROT_READ) && (reg.prot & PROT_EXEC)) {
319 xbt_assert(!result->start_exec,
320 "Multiple executable segments for %s, not supported",
321 maps->regions[i].pathname);
322 result->start_exec = reg.start_addr;
323 result->end_exec = reg.end_addr;
324 } else if ((reg.prot & PROT_READ) && !(reg.prot & PROT_EXEC)) {
325 xbt_assert(!result->start_ro,
326 "Multiple read only segments for %s, not supported",
327 maps->regions[i].pathname);
328 result->start_ro = reg.start_addr;
329 result->end_ro = reg.end_addr;
334 result->start = result->start_rw;
335 if ((const void*) result->start_ro > result->start)
336 result->start = result->start_ro;
337 if ((const void*) result->start_exec > result->start)
338 result->start = result->start_exec;
340 result->end = result->end_rw;
341 if (result->end_ro && (const void*) result->end_ro < result->end)
342 result->end = result->end_ro;
343 if (result->end_exec && (const void*) result->end_exec > result->end)
344 result->end = result->end_exec;
346 xbt_assert(result->file_name);
347 xbt_assert(result->start_rw);
348 xbt_assert(result->start_exec);
351 /************************************* Take Snapshot ************************************/
352 /****************************************************************************************/
354 /** \brief Checks whether the variable is in scope for a given IP.
356 * A variable may be defined only from a given value of IP.
358 * \param var Variable description
359 * \param frame Scope description
360 * \param ip Instruction pointer
361 * \return true if the variable is valid
363 static bool mc_valid_variable(dw_variable_t var, dw_frame_t scope,
366 // The variable is not yet valid:
367 if ((const void *) ((const char *) scope->low_pc + var->start_scope) > ip)
373 static void mc_fill_local_variables_values(mc_stack_frame_t stack_frame,
374 dw_frame_t scope, int process_index, xbt_dynar_t result)
376 mc_process_t process = &mc_model_checker->process;
378 void *ip = (void *) stack_frame->ip;
379 if (ip < scope->low_pc || ip >= scope->high_pc)
383 dw_variable_t current_variable;
384 xbt_dynar_foreach(scope->variables, cursor, current_variable) {
386 if (!mc_valid_variable(current_variable, scope, (void *) stack_frame->ip))
390 // FIXME, get rid of `region_type`
391 if ((long) stack_frame->ip > (long) process->libsimgrid_info->start_exec)
396 local_variable_t new_var = xbt_new0(s_local_variable_t, 1);
397 new_var->subprogram = stack_frame->frame;
398 new_var->ip = stack_frame->ip;
399 new_var->name = xbt_strdup(current_variable->name);
400 new_var->type = current_variable->type;
401 new_var->region = region_type;
403 if (current_variable->address != NULL) {
404 new_var->address = current_variable->address;
405 } else if (current_variable->locations.size != 0) {
406 s_mc_location_t location;
407 mc_dwarf_resolve_locations(
408 &location, ¤t_variable->locations,
409 current_variable->object_info,
410 &(stack_frame->unw_cursor),
411 (void *) stack_frame->frame_base,
412 (mc_address_space_t) &mc_model_checker->process, process_index);
414 switch(mc_get_location_type(&location)) {
415 case MC_LOCATION_TYPE_ADDRESS:
416 new_var->address = location.memory_location;
418 case MC_LOCATION_TYPE_REGISTER:
420 xbt_die("Cannot handle non-address variable");
424 xbt_die("No address");
427 xbt_dynar_push(result, &new_var);
430 // Recursive processing of nested scopes:
431 dw_frame_t nested_scope = NULL;
432 xbt_dynar_foreach(scope->scopes, cursor, nested_scope) {
433 mc_fill_local_variables_values(stack_frame, nested_scope, process_index, result);
437 static xbt_dynar_t MC_get_local_variables_values(xbt_dynar_t stack_frames, int process_index)
440 unsigned cursor1 = 0;
441 mc_stack_frame_t stack_frame;
442 xbt_dynar_t variables =
443 xbt_dynar_new(sizeof(local_variable_t), local_variable_free_voidp);
445 xbt_dynar_foreach(stack_frames, cursor1, stack_frame) {
446 mc_fill_local_variables_values(stack_frame, stack_frame->frame, process_index, variables);
452 static void MC_stack_frame_free_voipd(void *s)
454 mc_stack_frame_t stack_frame = *(mc_stack_frame_t *) s;
456 xbt_free(stack_frame->frame_name);
457 xbt_free(stack_frame);
461 static xbt_dynar_t MC_unwind_stack_frames(mc_unw_context_t stack_context)
463 mc_process_t process = &mc_model_checker->process;
465 xbt_dynar_new(sizeof(mc_stack_frame_t), MC_stack_frame_free_voipd);
469 // TODO, check condition check (unw_init_local==0 means end of frame)
470 if (mc_unw_init_cursor(&c, stack_context) != 0) {
472 xbt_die("Could not initialize stack unwinding");
477 mc_stack_frame_t stack_frame = xbt_new(s_mc_stack_frame_t, 1);
478 xbt_dynar_push(result, &stack_frame);
480 stack_frame->unw_cursor = c;
484 unw_get_reg(&c, UNW_REG_IP, &ip);
485 unw_get_reg(&c, UNW_REG_SP, &sp);
487 stack_frame->ip = ip;
488 stack_frame->sp = sp;
490 // TODO, use real addresses in frame_t instead of fixing it here
492 dw_frame_t frame = MC_process_find_function(process, (void *) ip);
493 stack_frame->frame = frame;
496 stack_frame->frame_name = xbt_strdup(frame->name);
497 stack_frame->frame_base =
498 (unw_word_t) mc_find_frame_base(frame, frame->object_info, &c);
500 stack_frame->frame_base = 0;
501 stack_frame->frame_name = NULL;
504 /* Stop before context switch with maestro */
505 if (frame != NULL && frame->name != NULL
506 && !strcmp(frame->name, "smx_ctx_sysv_wrapper"))
509 int ret = unw_step(&c);
511 xbt_die("Unexpected end of stack.");
512 } else if (ret < 0) {
513 xbt_die("Error while unwinding stack");
517 if (xbt_dynar_length(result) == 0) {
518 XBT_INFO("unw_init_local failed");
525 static xbt_dynar_t MC_take_snapshot_stacks(mc_snapshot_t * snapshot)
529 xbt_dynar_new(sizeof(s_mc_snapshot_stack_t),
530 MC_snapshot_stack_free_voidp);
532 unsigned int cursor = 0;
533 stack_region_t current_stack;
535 // FIXME, cross-process support (stack_areas)
536 xbt_dynar_foreach(stacks_areas, cursor, current_stack) {
537 mc_snapshot_stack_t st = xbt_new(s_mc_snapshot_stack_t, 1);
539 // Read the context from remote process:
540 unw_context_t context;
541 MC_process_read_simple(&mc_model_checker->process,
542 &context, (unw_context_t*) current_stack->context, sizeof(context));
544 st->context = xbt_new0(s_mc_unw_context_t, 1);
545 if (mc_unw_init_context(st->context, &mc_model_checker->process,
547 xbt_die("Could not initialise the libunwind context.");
550 st->stack_frames = MC_unwind_stack_frames(st->context);
551 st->local_variables = MC_get_local_variables_values(st->stack_frames, current_stack->process_index);
552 st->process_index = current_stack->process_index;
554 unw_word_t sp = xbt_dynar_get_as(st->stack_frames, 0, mc_stack_frame_t)->sp;
556 xbt_dynar_push(res, &st);
557 (*snapshot)->stack_sizes =
558 xbt_realloc((*snapshot)->stack_sizes, (cursor + 1) * sizeof(size_t));
559 (*snapshot)->stack_sizes[cursor] =
560 (char*) current_stack->address + current_stack->size - (char*) sp;
567 static xbt_dynar_t MC_take_snapshot_ignore()
570 if (mc_heap_comparison_ignore == NULL)
574 xbt_dynar_new(sizeof(mc_heap_ignore_region_t),
575 heap_ignore_region_free_voidp);
577 unsigned int cursor = 0;
578 mc_heap_ignore_region_t current_region;
580 xbt_dynar_foreach(mc_heap_comparison_ignore, cursor, current_region) {
581 mc_heap_ignore_region_t new_region = NULL;
582 new_region = xbt_new0(s_mc_heap_ignore_region_t, 1);
583 new_region->address = current_region->address;
584 new_region->size = current_region->size;
585 new_region->block = current_region->block;
586 new_region->fragment = current_region->fragment;
587 xbt_dynar_push(cpy, &new_region);
594 static void mc_free_snapshot_ignored_data_pvoid(void* data) {
595 mc_snapshot_ignored_data_t ignored_data = (mc_snapshot_ignored_data_t) data;
596 free(ignored_data->data);
599 static void MC_snapshot_handle_ignore(mc_snapshot_t snapshot)
601 xbt_assert(snapshot->process);
602 snapshot->ignored_data = xbt_dynar_new(sizeof(s_mc_snapshot_ignored_data_t), mc_free_snapshot_ignored_data_pvoid);
605 unsigned int cursor = 0;
606 mc_checkpoint_ignore_region_t region;
607 xbt_dynar_foreach (mc_model_checker->process.checkpoint_ignore, cursor, region) {
608 s_mc_snapshot_ignored_data_t ignored_data;
609 ignored_data.start = region->addr;
610 ignored_data.size = region->size;
611 ignored_data.data = malloc(region->size);
612 // TODO, we should do this once per privatization segment:
613 MC_process_read(snapshot->process,
614 MC_ADDRESS_SPACE_READ_FLAGS_NONE,
615 ignored_data.data, region->addr, region->size, MC_PROCESS_INDEX_DISABLED);
616 xbt_dynar_push(snapshot->ignored_data, &ignored_data);
620 xbt_dynar_foreach (mc_model_checker->process.checkpoint_ignore, cursor, region) {
621 MC_process_clear_memory(snapshot->process, region->addr, region->size);
626 static void MC_snapshot_ignore_restore(mc_snapshot_t snapshot)
628 unsigned int cursor = 0;
629 s_mc_snapshot_ignored_data_t ignored_data;
630 xbt_dynar_foreach (snapshot->ignored_data, cursor, ignored_data) {
631 MC_process_write(snapshot->process,
632 ignored_data.data, ignored_data.start, ignored_data.size);
636 /** @brief Can we remove this snapshot?
638 * Some snapshots cannot be removed (yet) because we need them
643 int mc_important_snapshot(mc_snapshot_t snapshot)
645 // We need this snapshot in order to know which
646 // pages needs to be stored in the next snapshot.
647 // This field is only non-NULL when using soft-dirty
649 if (snapshot == mc_model_checker->parent_snapshot)
655 static void MC_get_current_fd(mc_snapshot_t snapshot)
658 snapshot->total_fd = 0;
660 const size_t fd_dir_path_size = 20;
661 char fd_dir_path[fd_dir_path_size];
662 if (snprintf(fd_dir_path, fd_dir_path_size,
663 "/proc/%lli/fd", (long long int) snapshot->process->pid) > fd_dir_path_size)
664 xbt_die("Unexpected buffer is too small for fd_dir_path");
666 DIR* fd_dir = opendir(fd_dir_path);
668 xbt_die("Cannot open directory '/proc/self/fd'\n");
671 struct dirent* fd_number;
672 while ((fd_number = readdir(fd_dir))) {
674 int fd_value = atoi(fd_number->d_name);
679 const size_t source_size = 25;
681 if (snprintf(source, source_size, "/proc/%lli/fd/%s",
682 (long long int) snapshot->process->pid, fd_number->d_name) > source_size)
683 xbt_die("Unexpected buffer is too small for fd %s", fd_number->d_name);
685 const size_t link_size = 200;
687 int res = readlink(source, link, link_size);
689 xbt_die("Could not read link for %s", source);
692 xbt_die("Buffer to small for link of %s", source);
696 if(smpi_is_privatisation_file(link))
699 // This is (probably) the DIR* we are reading:
700 // TODO, read all the file entries at once and close the DIR.*
701 if(strcmp(fd_dir_path, link) == 0)
704 // We don't handle them.
705 // It does not mean we should silently ignore them however.
706 if (strncmp(link, "pipe:", 5) == 0 || strncmp(link, "socket:", 7) == 0)
709 // If dot_output enabled, do not handle the corresponding file
710 if (dot_output != NULL && strcmp(basename(link), _sg_mc_dot_output_file) == 0)
713 // This is probably a shared memory used by lttng-ust:
714 if(strncmp("/dev/shm/ust-shm-tmp-", link, 21)==0)
717 // Add an entry for this FD in the snapshot:
718 fd_infos_t fd = xbt_new0(s_fd_infos_t, 1);
719 fd->filename = strdup(link);
720 fd->number = fd_value;
721 fd->flags = fcntl(fd_value, F_GETFL) | fcntl(fd_value, F_GETFD) ;
722 fd->current_position = lseek(fd_value, 0, SEEK_CUR);
723 snapshot->current_fd = xbt_realloc(snapshot->current_fd, (total_fd + 1) * sizeof(fd_infos_t));
724 snapshot->current_fd[total_fd] = fd;
728 snapshot->total_fd = total_fd;
732 static s_mc_address_space_class_t mc_snapshot_class = {
733 .read = (void*) &MC_snapshot_read
736 mc_snapshot_t MC_take_snapshot(int num_state)
738 XBT_DEBUG("Taking snapshot %i", num_state);
740 mc_process_t mc_process = &mc_model_checker->process;
741 mc_snapshot_t snapshot = xbt_new0(s_mc_snapshot_t, 1);
742 snapshot->process = mc_process;
743 snapshot->num_state = num_state;
744 snapshot->address_space.address_space_class = &mc_snapshot_class;
746 snapshot->enabled_processes = xbt_dynar_new(sizeof(int), NULL);
748 smx_process_t process;
749 MC_EACH_SIMIX_PROCESS(process,
750 xbt_dynar_push_as(snapshot->enabled_processes, int, (int)process->pid));
752 MC_snapshot_handle_ignore(snapshot);
754 if (_sg_mc_snapshot_fds)
755 MC_get_current_fd(snapshot);
757 const bool use_soft_dirty = _sg_mc_sparse_checkpoint
759 && MC_process_is_self(mc_process);
761 /* Save the std heap and the writable mapped pages of libsimgrid and binary */
762 MC_get_memory_regions(mc_process, snapshot);
764 mc_softdirty_reset();
766 snapshot->to_ignore = MC_take_snapshot_ignore();
768 if (_sg_mc_visited > 0 || strcmp(_sg_mc_property_file, "")) {
770 MC_take_snapshot_stacks(&snapshot);
771 if (_sg_mc_hash && snapshot->stacks != NULL) {
772 snapshot->hash = mc_hash_processes_state(num_state, snapshot->stacks);
780 MC_snapshot_ignore_restore(snapshot);
782 mc_model_checker->parent_snapshot = snapshot;
787 void MC_restore_snapshot_regions(mc_snapshot_t snapshot)
789 mc_snapshot_t parent_snapshot = mc_model_checker->parent_snapshot;
791 const size_t n = snapshot->snapshot_regions_count;
792 for (size_t i = 0; i < n; i++) {
793 // For privatized, variables we decided it was not necessary to take the snapshot:
794 if (snapshot->snapshot_regions[i])
795 MC_region_restore(snapshot->snapshot_regions[i],
796 parent_snapshot ? parent_snapshot->snapshot_regions[i] : NULL);
800 // TODO, send a message to implement this in the MCed process
801 if(snapshot->privatization_index >= 0) {
802 // We just rewrote the global variables.
803 // The privatisation segment SMPI thinks
804 // is mapped might be inconsistent with the segment which
805 // is really mapped in memory (kernel state).
806 // We ask politely SMPI to map the segment anyway,
807 // even if it thinks it is the current one:
808 smpi_really_switch_data_segment(snapshot->privatization_index);
814 void MC_restore_snapshot_fds(mc_snapshot_t snapshot)
816 if (mc_mode == MC_MODE_SERVER)
817 xbt_die("FD snapshot not implemented in client/server mode.");
821 for(i=0; i < snapshot->total_fd; i++){
823 new_fd = open(snapshot->current_fd[i]->filename, snapshot->current_fd[i]->flags);
825 xbt_die("Could not reopen the file %s fo restoring the file descriptor",
826 snapshot->current_fd[i]->filename);
828 if(new_fd != -1 && new_fd != snapshot->current_fd[i]->number){
829 dup2(new_fd, snapshot->current_fd[i]->number);
830 //fprintf(stderr, "%p\n", fdopen(snapshot->current_fd[i]->number, "rw"));
833 lseek(snapshot->current_fd[i]->number, snapshot->current_fd[i]->current_position, SEEK_SET);
837 void MC_restore_snapshot(mc_snapshot_t snapshot)
839 XBT_DEBUG("Restore snapshot %i", snapshot->num_state);
841 const bool use_soft_dirty = _sg_mc_sparse_checkpoint
843 && MC_process_is_self(&mc_model_checker->process);
845 MC_restore_snapshot_regions(snapshot);
846 if (_sg_mc_snapshot_fds)
847 MC_restore_snapshot_fds(snapshot);
848 if (use_soft_dirty) {
849 mc_softdirty_reset();
851 MC_snapshot_ignore_restore(snapshot);
852 if (use_soft_dirty) {
853 mc_model_checker->parent_snapshot = snapshot;
856 mc_model_checker->process.cache_flags = 0;
859 mc_snapshot_t simcall_HANDLER_mc_snapshot(smx_simcall_t simcall)
861 return MC_take_snapshot(1);