-#include "private.h"
+/* Copyright (c) 2008-2014. The SimGrid Team.
+ * All rights reserved. */
-void MC_take_snapshot(mc_snapshot_t snapshot)
+/* This program is free software; you can redistribute it and/or modify it
+ * under the terms of the license (GNU LGPL) which comes with this package. */
+
+#define _GNU_SOURCE
+#define UNW_LOCAL_ONLY
+
+#include <unistd.h>
+
+#include <string.h>
+#include <link.h>
+#include <dirent.h>
+
+#include "internal_config.h"
+#include "mc_private.h"
+#include "xbt/module.h"
+#include <xbt/mmalloc.h>
+#include "../smpi/private.h"
+#include <alloca.h>
+
+#include "xbt/mmalloc/mmprivate.h"
+
+#include "../simix/smx_private.h"
+
+#define UNW_LOCAL_ONLY
+#include <libunwind.h>
+#include <libelf.h>
+
+#include "mc_private.h"
+#include <mc/mc.h>
+
+#include "mc_mmu.h"
+
+XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_checkpoint, mc,
+ "Logging specific to mc_checkpoint");
+
+char *libsimgrid_path;
+
+/************************************ Free functions **************************************/
+/*****************************************************************************************/
+
+static void MC_snapshot_stack_free(mc_snapshot_stack_t s)
{
-/* Save the heap! */
- snapshot->heap_size = MC_save_heap(&(snapshot->heap));
+ if (s) {
+ xbt_dynar_free(&(s->local_variables));
+ xbt_dynar_free(&(s->stack_frames));
+ xbt_free(s);
+ }
+}
-/* Save data and bss that */
- snapshot->data_size = MC_save_dataseg(&(snapshot->data));
+static void MC_snapshot_stack_free_voidp(void *s)
+{
+ MC_snapshot_stack_free((mc_snapshot_stack_t) * (void **) s);
}
-void MC_restore_snapshot(mc_snapshot_t snapshot)
+static void local_variable_free(local_variable_t v)
{
- MC_restore_heap(snapshot->heap, snapshot->heap_size);
- MC_restore_dataseg(snapshot->data, snapshot->data_size);
+ xbt_free(v->name);
+ xbt_free(v);
+}
+
+static void local_variable_free_voidp(void *v)
+{
+ local_variable_free((local_variable_t) * (void **) v);
+}
+
+void MC_region_destroy(mc_mem_region_t reg)
+{
+ if (!reg)
+ return;
+
+ //munmap(reg->data, reg->size);
+ xbt_free(reg->data);
+ if (reg->page_numbers) {
+ mc_free_page_snapshot_region(reg->page_numbers, mc_page_count(reg->size));
+ }
+ xbt_free(reg);
}
void MC_free_snapshot(mc_snapshot_t snapshot)
{
- xbt_free(snapshot->heap);
- xbt_free(snapshot->data);
+ unsigned int i;
+ for (i = 0; i < NB_REGIONS; i++) {
+ MC_region_destroy(snapshot->regions[i]);
+ }
+
+ xbt_free(snapshot->stack_sizes);
+ xbt_dynar_free(&(snapshot->stacks));
+ xbt_dynar_free(&(snapshot->to_ignore));
+ xbt_dynar_free(&snapshot->ignored_data);
+
+ if (snapshot->privatization_regions) {
+ size_t n = xbt_dynar_length(snapshot->enabled_processes);
+ for (i = 0; i != n; ++i) {
+ MC_region_destroy(snapshot->privatization_regions[i]);
+ }
+ xbt_free(snapshot->privatization_regions);
+ }
+
xbt_free(snapshot);
}
+
+/******************************* Snapshot regions ********************************/
+/*********************************************************************************/
+
+static mc_mem_region_t mc_region_new_dense(int type, void *start_addr, void* permanent_addr, size_t size, mc_mem_region_t ref_reg)
+{
+ mc_mem_region_t new_reg = xbt_new(s_mc_mem_region_t, 1);
+ new_reg->start_addr = start_addr;
+ new_reg->permanent_addr = permanent_addr;
+ new_reg->data = NULL;
+ new_reg->size = size;
+ new_reg->page_numbers = NULL;
+ new_reg->data = xbt_malloc(size);
+ memcpy(new_reg->data, permanent_addr, size);
+ XBT_DEBUG("New region : type : %d, data : %p (real addr %p), size : %zu",
+ type, new_reg->data, permanent_addr, size);
+ return new_reg;
+
+}
+
+/** @brief Take a snapshot of a given region
+ *
+ * @param type
+ * @param start_addr Address of the region in the simulated process
+ * @param permanent_addr Permanent address of this data (for privatized variables, this is the virtual address of the privatized mapping)
+ * @param size Size of the data*
+ * @param ref_reg Reference corresponding region
+ */
+static mc_mem_region_t MC_region_new(int type, void *start_addr, void* permanent_addr, size_t size, mc_mem_region_t ref_reg)
+{
+ if (_sg_mc_sparse_checkpoint) {
+ return mc_region_new_sparse(type, start_addr, permanent_addr, size, ref_reg);
+ } else {
+ return mc_region_new_dense(type, start_addr, permanent_addr, size, ref_reg);
+ }
+}
+
+/** @brief Restore a region from a snapshot
+ *
+ * If we are using per page snapshots, it is possible to use the reference
+ * region in order to do an incremental restoration of the region: the
+ * softclean pages which are shared between the two snapshots do not need
+ * to be restored.
+ *
+ * @param reg Target region
+ * @param reg_reg Current region (if not NULL), used for lazy per page restoration
+ */
+static void MC_region_restore(mc_mem_region_t reg, mc_mem_region_t ref_reg)
+{
+ /*FIXME: check if start_addr is still mapped, if it is not, then map it
+ before copying the data */
+ if (!reg->page_numbers) {
+ memcpy(reg->permanent_addr, reg->data, reg->size);
+ } else {
+ mc_region_restore_sparse(reg, ref_reg);
+ }
+ return;
+}
+
+static void MC_snapshot_add_region(mc_snapshot_t snapshot, int type,
+ void *start_addr, void* permanent_addr, size_t size)
+
+{
+ mc_mem_region_t ref_reg =
+ mc_model_checker->parent_snapshot ? mc_model_checker->parent_snapshot->regions[type] : NULL;
+ mc_mem_region_t new_reg = MC_region_new(type, start_addr, permanent_addr, size, ref_reg);
+ snapshot->regions[type] = new_reg;
+ return;
+}
+
+static void MC_get_memory_regions(mc_snapshot_t snapshot)
+{
+
+ void *start_heap = std_heap->base;
+ void *end_heap = std_heap->breakval;
+ MC_snapshot_add_region(snapshot, 0, start_heap, start_heap,
+ (char *) end_heap - (char *) start_heap);
+ snapshot->heap_bytes_used = mmalloc_get_bytes_used(std_heap);
+ snapshot->privatization_regions = NULL;
+
+ MC_snapshot_add_region(snapshot, 1,
+ mc_libsimgrid_info->start_rw, mc_libsimgrid_info->start_rw,
+ mc_libsimgrid_info->end_rw - mc_libsimgrid_info->start_rw);
+
+#ifdef HAVE_SMPI
+ size_t i;
+ if (smpi_privatize_global_variables && smpi_process_count()) {
+ // Snapshot the global variable of the application separately for each
+ // simulated process:
+ snapshot->privatization_regions =
+ xbt_new(mc_mem_region_t, smpi_process_count());
+ for (i = 0; i < smpi_process_count(); i++) {
+ mc_mem_region_t ref_reg =
+ mc_model_checker->parent_snapshot ? mc_model_checker->parent_snapshot->privatization_regions[i] : NULL;
+ snapshot->privatization_regions[i] =
+ MC_region_new(-1, mc_binary_info->start_rw, smpi_privatisation_regions[i].address, size_data_exe, ref_reg);
+ }
+ snapshot->privatization_index = smpi_loaded_page;
+ snapshot->regions[2] = NULL;
+ } else
+#endif
+ {
+ MC_snapshot_add_region(snapshot, 2,
+ mc_binary_info->start_rw, mc_binary_info->start_rw,
+ mc_binary_info->end_rw - mc_binary_info->start_rw);
+ snapshot->privatization_regions = NULL;
+ snapshot->privatization_index = -1;
+ }
+}
+
+/** @brief Finds the range of the different memory segments and binary paths */
+void MC_init_memory_map_info()
+{
+
+ unsigned int i = 0;
+ s_map_region_t reg;
+ memory_map_t maps = MC_get_memory_map();
+
+ maestro_stack_start = NULL;
+ maestro_stack_end = NULL;
+ libsimgrid_path = NULL;
+
+ while (i < maps->mapsize) {
+ reg = maps->regions[i];
+ if (maps->regions[i].pathname == NULL) {
+ // Nothing to do
+ } else if ((reg.prot & PROT_WRITE)
+ && !memcmp(maps->regions[i].pathname, "[stack]", 7)) {
+ maestro_stack_start = reg.start_addr;
+ maestro_stack_end = reg.end_addr;
+ } else if ((reg.prot & PROT_READ) && (reg.prot & PROT_EXEC)
+ && !memcmp(basename(maps->regions[i].pathname), "libsimgrid",
+ 10)) {
+ if (libsimgrid_path == NULL)
+ libsimgrid_path = strdup(maps->regions[i].pathname);
+ }
+ i++;
+ }
+
+ xbt_assert(maestro_stack_start, "maestro_stack_start");
+ xbt_assert(maestro_stack_end, "maestro_stack_end");
+ xbt_assert(libsimgrid_path, "libsimgrid_path&");
+
+ MC_free_memory_map(maps);
+
+}
+
+/** \brief Fills the position of the segments (executable, read-only, read/write).
+ *
+ * TODO, use dl_iterate_phdr to be more robust
+ * */
+void MC_find_object_address(memory_map_t maps, mc_object_info_t result)
+{
+
+ unsigned int i = 0;
+ s_map_region_t reg;
+ const char *name = basename(result->file_name);
+ while (i < maps->mapsize) {
+ reg = maps->regions[i];
+ if (maps->regions[i].pathname == NULL
+ || strcmp(basename(maps->regions[i].pathname), name)) {
+ // Nothing to do
+ } else if ((reg.prot & PROT_WRITE)) {
+ xbt_assert(!result->start_rw,
+ "Multiple read-write segments for %s, not supported",
+ maps->regions[i].pathname);
+ result->start_rw = reg.start_addr;
+ result->end_rw = reg.end_addr;
+ // .bss is usually after the .data:
+ s_map_region_t *next = &(maps->regions[i + 1]);
+ if (next->pathname == NULL && (next->prot & PROT_WRITE)
+ && next->start_addr == reg.end_addr) {
+ result->end_rw = maps->regions[i + 1].end_addr;
+ }
+ } else if ((reg.prot & PROT_READ) && (reg.prot & PROT_EXEC)) {
+ xbt_assert(!result->start_exec,
+ "Multiple executable segments for %s, not supported",
+ maps->regions[i].pathname);
+ result->start_exec = reg.start_addr;
+ result->end_exec = reg.end_addr;
+ } else if ((reg.prot & PROT_READ) && !(reg.prot & PROT_EXEC)) {
+ xbt_assert(!result->start_ro,
+ "Multiple read only segments for %s, not supported",
+ maps->regions[i].pathname);
+ result->start_ro = reg.start_addr;
+ result->end_ro = reg.end_addr;
+ }
+ i++;
+ }
+
+ xbt_assert(result->file_name);
+ xbt_assert(result->start_rw);
+ xbt_assert(result->start_exec);
+}
+
+/************************************* Take Snapshot ************************************/
+/****************************************************************************************/
+
+/** \brief Checks whether the variable is in scope for a given IP.
+ *
+ * A variable may be defined only from a given value of IP.
+ *
+ * \param var Variable description
+ * \param frame Scope description
+ * \param ip Instruction pointer
+ * \return true if the variable is valid
+ * */
+static bool mc_valid_variable(dw_variable_t var, dw_frame_t scope,
+ const void *ip)
+{
+ // The variable is not yet valid:
+ if ((const void *) ((const char *) scope->low_pc + var->start_scope) > ip)
+ return false;
+ else
+ return true;
+}
+
+static void mc_fill_local_variables_values(mc_stack_frame_t stack_frame,
+ dw_frame_t scope, int process_index, xbt_dynar_t result)
+{
+ void *ip = (void *) stack_frame->ip;
+ if (ip < scope->low_pc || ip >= scope->high_pc)
+ return;
+
+ unsigned cursor = 0;
+ dw_variable_t current_variable;
+ xbt_dynar_foreach(scope->variables, cursor, current_variable) {
+
+ if (!mc_valid_variable(current_variable, scope, (void *) stack_frame->ip))
+ continue;
+
+ int region_type;
+ if ((long) stack_frame->ip > (long) mc_libsimgrid_info->start_exec)
+ region_type = 1;
+ else
+ region_type = 2;
+
+ local_variable_t new_var = xbt_new0(s_local_variable_t, 1);
+ new_var->subprogram = stack_frame->frame;
+ new_var->ip = stack_frame->ip;
+ new_var->name = xbt_strdup(current_variable->name);
+ new_var->type = current_variable->type;
+ new_var->region = region_type;
+
+ if (current_variable->address != NULL) {
+ new_var->address = current_variable->address;
+ } else if (current_variable->locations.size != 0) {
+ s_mc_location_t location;
+ mc_dwarf_resolve_locations(&location, ¤t_variable->locations,
+ current_variable->object_info,
+ &(stack_frame->unw_cursor),
+ (void *) stack_frame->frame_base,
+ NULL, process_index);
+
+ switch(mc_get_location_type(&location)) {
+ case MC_LOCATION_TYPE_ADDRESS:
+ new_var->address = location.memory_location;
+ break;
+ case MC_LOCATION_TYPE_REGISTER:
+ default:
+ xbt_die("Cannot handle non-address variable");
+ }
+
+ } else {
+ xbt_die("No address");
+ }
+
+ xbt_dynar_push(result, &new_var);
+ }
+
+ // Recursive processing of nested scopes:
+ dw_frame_t nested_scope = NULL;
+ xbt_dynar_foreach(scope->scopes, cursor, nested_scope) {
+ mc_fill_local_variables_values(stack_frame, nested_scope, process_index, result);
+ }
+}
+
+static xbt_dynar_t MC_get_local_variables_values(xbt_dynar_t stack_frames, int process_index)
+{
+
+ unsigned cursor1 = 0;
+ mc_stack_frame_t stack_frame;
+ xbt_dynar_t variables =
+ xbt_dynar_new(sizeof(local_variable_t), local_variable_free_voidp);
+
+ xbt_dynar_foreach(stack_frames, cursor1, stack_frame) {
+ mc_fill_local_variables_values(stack_frame, stack_frame->frame, process_index, variables);
+ }
+
+ return variables;
+}
+
+static void MC_stack_frame_free_voipd(void *s)
+{
+ mc_stack_frame_t stack_frame = *(mc_stack_frame_t *) s;
+ if (stack_frame) {
+ xbt_free(stack_frame->frame_name);
+ xbt_free(stack_frame);
+ }
+}
+
+static xbt_dynar_t MC_unwind_stack_frames(void *stack_context)
+{
+ xbt_dynar_t result =
+ xbt_dynar_new(sizeof(mc_stack_frame_t), MC_stack_frame_free_voipd);
+
+ unw_cursor_t c;
+
+ // TODO, check condition check (unw_init_local==0 means end of frame)
+ if (unw_init_local(&c, (unw_context_t *) stack_context) != 0) {
+
+ xbt_die("Could not initialize stack unwinding");
+
+ } else
+ while (1) {
+
+ mc_stack_frame_t stack_frame = xbt_new(s_mc_stack_frame_t, 1);
+ xbt_dynar_push(result, &stack_frame);
+
+ stack_frame->unw_cursor = c;
+
+ unw_word_t ip, sp;
+
+ unw_get_reg(&c, UNW_REG_IP, &ip);
+ unw_get_reg(&c, UNW_REG_SP, &sp);
+
+ stack_frame->ip = ip;
+ stack_frame->sp = sp;
+
+ // TODO, use real addresses in frame_t instead of fixing it here
+
+ dw_frame_t frame = MC_find_function_by_ip((void *) ip);
+ stack_frame->frame = frame;
+
+ if (frame) {
+ stack_frame->frame_name = xbt_strdup(frame->name);
+ stack_frame->frame_base =
+ (unw_word_t) mc_find_frame_base(frame, frame->object_info, &c);
+ } else {
+ stack_frame->frame_base = 0;
+ stack_frame->frame_name = NULL;
+ }
+
+ /* Stop before context switch with maestro */
+ if (frame != NULL && frame->name != NULL
+ && !strcmp(frame->name, "smx_ctx_sysv_wrapper"))
+ break;
+
+ int ret = ret = unw_step(&c);
+ if (ret == 0) {
+ xbt_die("Unexpected end of stack.");
+ } else if (ret < 0) {
+ xbt_die("Error while unwinding stack.");
+ }
+ }
+
+ if (xbt_dynar_length(result) == 0) {
+ XBT_INFO("unw_init_local failed");
+ xbt_abort();
+ }
+
+ return result;
+};
+
+static xbt_dynar_t MC_take_snapshot_stacks(mc_snapshot_t * snapshot)
+{
+
+ xbt_dynar_t res =
+ xbt_dynar_new(sizeof(s_mc_snapshot_stack_t),
+ MC_snapshot_stack_free_voidp);
+
+ unsigned int cursor = 0;
+ stack_region_t current_stack;
+
+ xbt_dynar_foreach(stacks_areas, cursor, current_stack) {
+ mc_snapshot_stack_t st = xbt_new(s_mc_snapshot_stack_t, 1);
+ st->stack_frames = MC_unwind_stack_frames(current_stack->context);
+ st->local_variables = MC_get_local_variables_values(st->stack_frames, current_stack->process_index);
+ st->process_index = current_stack->process_index;
+
+ unw_word_t sp = xbt_dynar_get_as(st->stack_frames, 0, mc_stack_frame_t)->sp;
+
+ xbt_dynar_push(res, &st);
+ (*snapshot)->stack_sizes =
+ xbt_realloc((*snapshot)->stack_sizes, (cursor + 1) * sizeof(size_t));
+ (*snapshot)->stack_sizes[cursor] =
+ (char*) current_stack->address + current_stack->size - (char*) sp;
+ }
+
+ return res;
+
+}
+
+static xbt_dynar_t MC_take_snapshot_ignore()
+{
+
+ if (mc_heap_comparison_ignore == NULL)
+ return NULL;
+
+ xbt_dynar_t cpy =
+ xbt_dynar_new(sizeof(mc_heap_ignore_region_t),
+ heap_ignore_region_free_voidp);
+
+ unsigned int cursor = 0;
+ mc_heap_ignore_region_t current_region;
+
+ xbt_dynar_foreach(mc_heap_comparison_ignore, cursor, current_region) {
+ mc_heap_ignore_region_t new_region = NULL;
+ new_region = xbt_new0(s_mc_heap_ignore_region_t, 1);
+ new_region->address = current_region->address;
+ new_region->size = current_region->size;
+ new_region->block = current_region->block;
+ new_region->fragment = current_region->fragment;
+ xbt_dynar_push(cpy, &new_region);
+ }
+
+ return cpy;
+
+}
+
+static void mc_free_snapshot_ignored_data_pvoid(void* data) {
+ mc_snapshot_ignored_data_t ignored_data = (mc_snapshot_ignored_data_t) data;
+ free(ignored_data->data);
+}
+
+static void MC_snapshot_handle_ignore(mc_snapshot_t snapshot)
+{
+ snapshot->ignored_data = xbt_dynar_new(sizeof(s_mc_snapshot_ignored_data_t), mc_free_snapshot_ignored_data_pvoid);
+
+ // Copy the memory:
+ unsigned int cursor = 0;
+ mc_checkpoint_ignore_region_t region;
+ xbt_dynar_foreach (mc_checkpoint_ignore, cursor, region) {
+ s_mc_snapshot_ignored_data_t ignored_data;
+ ignored_data.start = region->addr;
+ ignored_data.size = region->size;
+ ignored_data.data = malloc(region->size);
+ memcpy(ignored_data.data, region->addr, region->size);
+ xbt_dynar_push(snapshot->ignored_data, &ignored_data);
+ }
+
+ // Zero the memory:
+ xbt_dynar_foreach (mc_checkpoint_ignore, cursor, region) {
+ memset(region->addr, 0, region->size);
+ }
+
+}
+
+static void MC_snapshot_ignore_restore(mc_snapshot_t snapshot)
+{
+ unsigned int cursor = 0;
+ s_mc_snapshot_ignored_data_t ignored_data;
+ xbt_dynar_foreach (snapshot->ignored_data, cursor, ignored_data) {
+ memcpy(ignored_data.start, ignored_data.data, ignored_data.size);
+ }
+}
+
+/** @brief Can we remove this snapshot?
+ *
+ * Some snapshots cannot be removed (yet) because we need them
+ * at this point.
+ *
+ * @param snapshot
+ */
+int mc_important_snapshot(mc_snapshot_t snapshot)
+{
+ // We need this snapshot in order to know which
+ // pages needs to be stored in the next snapshot.
+ // This field is only non-NULL when using soft-dirty
+ // page tracking.
+ if (snapshot == mc_model_checker->parent_snapshot)
+ return true;
+
+ return false;
+}
+
+static void MC_get_current_fd(mc_snapshot_t snapshot){
+
+ snapshot->total_fd = 0;
+
+ const size_t fd_dir_path_size = 20;
+ char fd_dir_path[fd_dir_path_size];
+ if (snprintf(fd_dir_path, fd_dir_path_size,
+ "/proc/%lli/fd", (long long int) getpid()) > fd_dir_path_size)
+ xbt_die("Unexpected buffer is too small for fd_dir_path");
+
+ DIR* fd_dir = opendir (fd_dir_path);
+ if (fd_dir == NULL)
+ xbt_die("Cannot open directory '/proc/self/fd'\n");
+
+ size_t total_fd = 0;
+ struct dirent* fd_number;
+ while ((fd_number = readdir(fd_dir))) {
+
+ int fd_value = atoi(fd_number->d_name);
+
+ if(fd_value < 3)
+ continue;
+
+ const size_t source_size = 25;
+ char source[25];
+ if (snprintf(source, source_size, "/proc/self/fd/%s", fd_number->d_name) > source_size)
+ xbt_die("Unexpected buffer is too small for fd %s", fd_number->d_name);
+
+ const size_t link_size = 200;
+ char link[200];
+ int res = readlink(source, link, link_size);
+ if (res<0) {
+ xbt_die("Could not read link for %s", source);
+ }
+ if (res==200) {
+ xbt_die("Buffer to small for link of %s", source);
+ }
+ link[res] = '\0';
+
+ if(smpi_is_privatisation_file(link))
+ continue;
+
+ // This is (probably) the DIR* we are reading:
+ // TODO, read all the file entries at once and close the DIR.*
+ if(strcmp(fd_dir_path, link) == 0)
+ continue;
+
+ // We don't handle them.
+ // It does not mean we should silently ignore them however.
+ if (strncmp(link, "pipe:", 5) == 0 || strncmp(link, "socket:", 7) == 0)
+ continue;
+
+ // This is probably a shared memory used by lttng-ust:
+ if(strncmp("/dev/shm/ust-shm-tmp-", link, 21)==0)
+ continue;
+
+ // Add an entry for this FD in the snapshot:
+ fd_infos_t fd = xbt_new0(s_fd_infos_t, 1);
+ fd->filename = strdup(link);
+ fd->number = fd_value;
+ fd->flags = fcntl(fd_value, F_GETFL) | fcntl(fd_value, F_GETFD) ;
+ fd->current_position = lseek(fd_value, 0, SEEK_CUR);
+ snapshot->current_fd = xbt_realloc(snapshot->current_fd, (total_fd + 1) * sizeof(fd_infos_t));
+ snapshot->current_fd[total_fd] = fd;
+ total_fd++;
+ }
+
+ snapshot->total_fd = total_fd;
+ closedir (fd_dir);
+}
+
+mc_snapshot_t MC_take_snapshot(int num_state)
+{
+
+ mc_snapshot_t snapshot = xbt_new0(s_mc_snapshot_t, 1);
+ snapshot->enabled_processes = xbt_dynar_new(sizeof(int), NULL);
+ smx_process_t process;
+ xbt_swag_foreach(process, simix_global->process_list) {
+ xbt_dynar_push_as(snapshot->enabled_processes, int, (int)process->pid);
+ }
+
+ MC_snapshot_handle_ignore(snapshot);
+
+ MC_get_current_fd(snapshot);
+
+ /* Save the std heap and the writable mapped pages of libsimgrid and binary */
+ MC_get_memory_regions(snapshot);
+ if (_sg_mc_sparse_checkpoint && _sg_mc_soft_dirty) {
+ mc_softdirty_reset();
+ }
+
+ snapshot->to_ignore = MC_take_snapshot_ignore();
+
+ if (_sg_mc_visited > 0 || strcmp(_sg_mc_property_file, "")) {
+ snapshot->stacks =
+ MC_take_snapshot_stacks(&snapshot);
+ if (_sg_mc_hash && snapshot->stacks != NULL) {
+ snapshot->hash = mc_hash_processes_state(num_state, snapshot->stacks);
+ } else {
+ snapshot->hash = 0;
+ }
+ } else {
+ snapshot->hash = 0;
+ }
+
+ MC_snapshot_ignore_restore(snapshot);
+ if (_sg_mc_sparse_checkpoint && _sg_mc_soft_dirty) {
+ mc_model_checker->parent_snapshot = snapshot;
+ }
+ return snapshot;
+}
+
+void MC_restore_snapshot(mc_snapshot_t snapshot)
+{
+ mc_snapshot_t parent_snapshot = mc_model_checker->parent_snapshot;
+
+ int new_fd;
+ unsigned int i;
+ for (i = 0; i < NB_REGIONS; i++) {
+ // For privatized, variables we decided it was not necessary to take the snapshot:
+ if (snapshot->regions[i])
+ MC_region_restore(snapshot->regions[i],
+ parent_snapshot ? parent_snapshot->regions[i] : NULL);
+ }
+
+#ifdef HAVE_SMPI
+ if (snapshot->privatization_regions) {
+ // Restore the global variables of the application separately for each
+ // simulated process:
+ for (i = 0; i < smpi_process_count(); i++) {
+ if (snapshot->privatization_regions[i]) {
+ MC_region_restore(snapshot->privatization_regions[i],
+ parent_snapshot ? parent_snapshot->privatization_regions[i] : NULL);
+ }
+ }
+ }
+ if(snapshot->privatization_index >= 0) {
+ // We just rewrote the global variables.
+ // The privatisation segment SMPI thinks
+ // is mapped might be inconsistent with the segment which
+ // is really mapped in memory (kernel state).
+ // We ask politely SMPI to map the segment anyway,
+ // even if it thinks it is the current one:
+ smpi_really_switch_data_segment(snapshot->privatization_index);
+ }
+#endif
+
+ for(i=0; i < snapshot->total_fd; i++){
+
+ new_fd = open(snapshot->current_fd[i]->filename, snapshot->current_fd[i]->flags);
+ if (new_fd <0) {
+ xbt_die("Could not reopen the file %s fo restoring the file descriptor",
+ snapshot->current_fd[i]->filename);
+ }
+ if(new_fd != -1 && new_fd != snapshot->current_fd[i]->number){
+ dup2(new_fd, snapshot->current_fd[i]->number);
+ //fprintf(stderr, "%p\n", fdopen(snapshot->current_fd[i]->number, "rw"));
+ close(new_fd);
+ };
+ lseek(snapshot->current_fd[i]->number, snapshot->current_fd[i]->current_position, SEEK_SET);
+ }
+
+ if (_sg_mc_sparse_checkpoint && _sg_mc_soft_dirty) {
+ mc_softdirty_reset();
+ }
+
+ MC_snapshot_ignore_restore(snapshot);
+ if (_sg_mc_sparse_checkpoint && _sg_mc_soft_dirty) {
+ mc_model_checker->parent_snapshot = snapshot;
+ }
+
+}
+
+mc_snapshot_t simcall_HANDLER_mc_snapshot(smx_simcall_t simcall)
+{
+ return MC_take_snapshot(1);
+}
+
+void *MC_snapshot(void)
+{
+ return simcall_mc_snapshot();
+}
