#include <libgen.h>
#include "mc_private.h"
-#include <xbt/module.h>
+#include "xbt/module.h"
+#include "../simix/smx_private.h"
+
+#include <libunwind.h>
XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_checkpoint, mc,
"Logging specific to mc_checkpoint");
+void *start_text_libsimgrid;
+void *start_plt_libsimgrid, *end_plt_libsimgrid;
+void *start_got_plt_libsimgrid, *end_got_plt_libsimgrid;
+void *start_plt_binary, *end_plt_binary;
+void *start_got_plt_binary, *end_got_plt_binary;
+char *libsimgrid_path;
+void *start_data_libsimgrid, *start_bss_libsimgrid;
+void *start_data_binary, *start_bss_binary;
+void *start_text_binary;
+void *end_raw_heap;
+
static mc_mem_region_t MC_region_new(int type, void *start_addr, size_t size);
static void MC_region_restore(mc_mem_region_t reg);
static void MC_region_destroy(mc_mem_region_t reg);
static void MC_snapshot_add_region(mc_snapshot_t snapshot, int type, void *start_addr, size_t size);
+static void add_value(xbt_dynar_t *list, const char *type, unsigned long int val);
+static xbt_dynar_t take_snapshot_stacks(mc_snapshot_t *s, void *heap);
+static xbt_strbuff_t get_local_variables_values(void *stack_context, void *heap);
+static void print_local_variables_values(xbt_dynar_t all_variables);
+static void *get_stack_pointer(void *stack_context, void *heap);
+
+static void snapshot_stack_free(mc_snapshot_stack_t s);
+
static mc_mem_region_t MC_region_new(int type, void *start_addr, size_t size)
{
mc_mem_region_t new_reg = xbt_new0(s_mc_mem_region_t, 1);
new_reg->start_addr = start_addr;
new_reg->size = size;
new_reg->data = xbt_malloc0(size);
- XBT_DEBUG("New reg data %p, start_addr %p, size %zu", new_reg->data, start_addr, size);
memcpy(new_reg->data, start_addr, size);
+
+ XBT_DEBUG("New region : type : %d, data : %p (real addr %p), size : %zu", type, new_reg->data, start_addr, size);
return new_reg;
}
{
/*FIXME: check if start_addr is still mapped, if it is not, then map it
before copying the data */
- if(reg->type == 3){
- memory_map_t maps = get_memory_map();
- MC_UNSET_RAW_MEM;
- unsigned int i=0;
- s_map_region_t r;
- while(i < maps->mapsize){
- r = maps->regions[i];
- if (maps->regions[i].pathname != NULL){
- if (!memcmp(maps->regions[i].pathname, "[stack]", 7)){
- size_t diff = (char*)reg->start_addr - (char*)r.start_addr;
- void *segment = malloc(reg->size + diff);
- XBT_DEBUG("Size of segment : %zu", sizeof(segment));
- memcpy((char *)segment + diff, reg->data, reg->size);
- memcpy(r.start_addr, segment, sizeof(segment));
- XBT_DEBUG("Memcpy region ok");
- break;
- }
- }
- i++;
- }
- }else{
- XBT_DEBUG("Memcpy : dest %p, src %p, size %zu", reg->start_addr, reg->data, reg->size);
- memcpy(reg->start_addr, reg->data, reg->size);
- }
-
+
+ memcpy(reg->start_addr, reg->data, reg->size);
+
return;
}
static void MC_snapshot_add_region(mc_snapshot_t snapshot, int type, void *start_addr, size_t size)
{
- switch(type){
- case 0 :
- XBT_DEBUG("New region heap (%zu)", size);
- break;
- case 1 :
- XBT_DEBUG("New region libsimgrid (%zu)", size);
- break;
- case 2 :
- XBT_DEBUG("New region program data (%zu)", size);
- break;
- }
mc_mem_region_t new_reg = MC_region_new(type, start_addr, size);
snapshot->regions = xbt_realloc(snapshot->regions, (snapshot->num_reg + 1) * sizeof(mc_mem_region_t));
snapshot->regions[snapshot->num_reg] = new_reg;
+ snapshot->region_type[snapshot->num_reg] = type;
snapshot->num_reg++;
return;
}
-void MC_take_snapshot(mc_snapshot_t snapshot)
-{
+void MC_init_memory_map_info(){
+
+ int raw_mem_set = (mmalloc_get_current_heap() == raw_heap);
+
+ MC_SET_RAW_MEM;
+
unsigned int i = 0;
s_map_region_t reg;
memory_map_t maps = get_memory_map();
- /* Save the std heap and the writable mapped pages of libsimgrid */
while (i < maps->mapsize) {
reg = maps->regions[i];
if ((reg.prot & PROT_WRITE)){
- if (maps->regions[i].pathname == NULL){
- if (reg.start_addr == std_heap){ // only save the std heap (and not the raw one)
- MC_snapshot_add_region(snapshot, 0, reg.start_addr, (char*)reg.end_addr - (char*)reg.start_addr);
+ if (maps->regions[i].pathname != NULL){
+ if (!memcmp(basename(maps->regions[i].pathname), "libsimgrid", 10)){
+ start_data_libsimgrid = reg.start_addr;
+ i++;
+ reg = maps->regions[i];
+ if(reg.pathname == NULL && (reg.prot & PROT_WRITE) && i < maps->mapsize)
+ start_bss_libsimgrid = reg.start_addr;
+ }else if (!memcmp(basename(maps->regions[i].pathname), basename(xbt_binary_name), strlen(basename(xbt_binary_name)))){
+ start_data_binary = reg.start_addr;
+ i++;
+ reg = maps->regions[i];
+ if(reg.pathname == NULL && (reg.prot & PROT_WRITE) && reg.start_addr != std_heap && reg.start_addr != raw_heap && i < maps->mapsize){
+ start_bss_binary = reg.start_addr;
+ i++;
+ }
+ }else if(!memcmp(maps->regions[i].pathname, "[heap]", 6)){
+ end_raw_heap = reg.end_addr;
+ i++;
}
- } else {
+ }
+ }else if ((reg.prot & PROT_READ) && (reg.prot & PROT_EXEC)){
+ if (maps->regions[i].pathname != NULL){
if (!memcmp(basename(maps->regions[i].pathname), "libsimgrid", 10)){
- MC_snapshot_add_region(snapshot, 1, reg.start_addr, (char*)reg.end_addr - (char*)reg.start_addr);
- }
+ start_text_libsimgrid = reg.start_addr;
+ libsimgrid_path = strdup(maps->regions[i].pathname);
+ }else if (!memcmp(basename(maps->regions[i].pathname), basename(xbt_binary_name), strlen(basename(xbt_binary_name)))){
+ start_text_binary = reg.start_addr;
+ }
}
}
i++;
}
+
+ free_memory_map(maps);
+
+ MC_UNSET_RAW_MEM;
+
+ if(raw_mem_set)
+ MC_SET_RAW_MEM;
- /* FIXME: free the memory map */
}
-void MC_take_snapshot_liveness(mc_snapshot_t snapshot)
+mc_snapshot_t SIMIX_pre_mc_snapshot(smx_simcall_t simcall){
+ return MC_take_snapshot();
+}
+
+mc_snapshot_t MC_take_snapshot()
{
+ int raw_mem = (mmalloc_get_current_heap() == raw_heap);
+
+ MC_SET_RAW_MEM;
+
+ mc_snapshot_t snapshot = xbt_new0(s_mc_snapshot_t, 1);
+ snapshot->nb_processes = xbt_swag_size(simix_global->process_list);
+
unsigned int i = 0;
s_map_region_t reg;
memory_map_t maps = get_memory_map();
-
- for(i=0; i< snapshot->num_reg; i++){
- MC_region_destroy(snapshot->regions[i]);
- }
-
- snapshot->num_reg = 0;
-
- i = 0;
+ int nb_reg = 0;
+ void *heap = NULL;
+ size_t size = 0;
+ void *start = NULL;
/* Save the std heap and the writable mapped pages of libsimgrid */
while (i < maps->mapsize) {
if ((reg.prot & PROT_WRITE)){
if (maps->regions[i].pathname == NULL){
if (reg.start_addr == std_heap){ // only save the std heap (and not the raw one)
- MC_snapshot_add_region(snapshot, 0, reg.start_addr, (char*)reg.end_addr - (char*)reg.start_addr);
+ MC_snapshot_add_region(snapshot, 0, reg.start_addr, (char*)reg.end_addr - (char*)reg.start_addr);
+ snapshot->heap_chunks_used = mmalloc_get_chunks_used(std_heap);
+ heap = snapshot->regions[nb_reg]->data;
+ nb_reg++;
}
- } else {
+ i++;
+ } else{
if (!memcmp(basename(maps->regions[i].pathname), "libsimgrid", 10)){
- MC_snapshot_add_region(snapshot, 1, reg.start_addr, (char*)reg.end_addr - (char*)reg.start_addr);
- } else {
- if (!memcmp(basename(maps->regions[i].pathname), basename(xbt_binary_name), strlen(basename(xbt_binary_name)))){
- MC_snapshot_add_region(snapshot, 2, reg.start_addr, (char*)reg.end_addr - (char*)reg.start_addr);
- }
- }
+ size = (char*)reg.end_addr - (char*)reg.start_addr;
+ start = reg.start_addr;
+ nb_reg++;
+ i++;
+ reg = maps->regions[i];
+ if(reg.pathname == NULL && (reg.prot & PROT_WRITE) && i < maps->mapsize){
+ size += (char*)reg.end_addr - (char*)reg.start_addr;
+ reg = maps->regions[i];
+ i++;
+ }
+ MC_snapshot_add_region(snapshot, 1, start, size);
+ }else if(!memcmp(maps->regions[i].pathname, "[heap]", 6)){
+ end_raw_heap = reg.end_addr;
+ i++;
+ } else if (!memcmp(basename(maps->regions[i].pathname), basename(xbt_binary_name), strlen(basename(xbt_binary_name)))){
+ size = (char*)reg.end_addr - (char*)reg.start_addr;
+ start = reg.start_addr;
+ nb_reg++;
+ i++;
+ reg = maps->regions[i];
+ if(reg.pathname == NULL && (reg.prot & PROT_WRITE) && reg.start_addr != std_heap && reg.start_addr != raw_heap && i < maps->mapsize){
+ size += (char*)reg.end_addr - (char*)reg.start_addr;
+ reg = maps->regions[i];
+ i++;
+ }
+ MC_snapshot_add_region(snapshot, 2, start, size);
+ }else{
+ i++;
+ }
}
+ }else{
+ i++;
}
- i++;
}
- /* FIXME: free the memory map */
+ if(_sg_mc_visited > 0 || strcmp(_sg_mc_property_file,""))
+ snapshot->stacks = take_snapshot_stacks(&snapshot, heap);
+
+ free_memory_map(maps);
+
+ MC_UNSET_RAW_MEM;
+
+ if(raw_mem)
+ MC_SET_RAW_MEM;
+
+ return snapshot;
+
}
void MC_restore_snapshot(mc_snapshot_t snapshot)
unsigned int i;
for(i=0; i < snapshot->num_reg; i++){
MC_region_restore(snapshot->regions[i]);
- switch(snapshot->regions[i]->type){
- case 0 :
- XBT_DEBUG("heap restored");
- break;
- case 1:
- XBT_DEBUG("libsimgrid (data) restored");
- break;
- case 2:
- XBT_DEBUG("data program restored");
- break;
- }
-
}
}
for(i=0; i < snapshot->num_reg; i++)
MC_region_destroy(snapshot->regions[i]);
+ xbt_free(snapshot->regions);
+ xbt_dynar_free(&(snapshot->stacks));
xbt_free(snapshot);
}
+void get_libsimgrid_plt_section(){
+
+ FILE *fp;
+ char *line = NULL; /* Temporal storage for each line that is readed */
+ ssize_t read; /* Number of bytes readed */
+ size_t n = 0; /* Amount of bytes to read by getline */
+
+ char *lfields[7];
+ int i, plt_found = 0;
+ unsigned long int size, offset;
+
+ char *command = bprintf("objdump --section-headers %s", libsimgrid_path);
+
+ fp = popen(command, "r");
+
+ if(fp == NULL){
+ perror("popen failed");
+ xbt_abort();
+ }
+
+ while ((read = getline(&line, &n, fp)) != -1 && plt_found != 2) {
+
+ if(n == 0)
+ continue;
+
+ /* Wipeout the new line character */
+ line[read - 1] = '\0';
+
+ lfields[0] = strtok(line, " ");
+
+ if(lfields[0] == NULL)
+ continue;
+
+ if(strcmp(lfields[0], "Sections:") == 0 || strcmp(lfields[0], "Idx") == 0 || strncmp(lfields[0], libsimgrid_path, strlen(libsimgrid_path)) == 0)
+ continue;
+
+ for (i = 1; i < 7 && lfields[i - 1] != NULL; i++) {
+ lfields[i] = strtok(NULL, " ");
+ }
+
+ if(i>=6){
+ if(strcmp(lfields[1], ".plt") == 0){
+ size = strtoul(lfields[2], NULL, 16);
+ offset = strtoul(lfields[5], NULL, 16);
+ start_plt_libsimgrid = (char *)start_text_libsimgrid + offset;
+ end_plt_libsimgrid = (char *)start_plt_libsimgrid + size;
+ plt_found++;
+ }else if(strcmp(lfields[1], ".got.plt") == 0){
+ size = strtoul(lfields[2], NULL, 16);
+ offset = strtoul(lfields[5], NULL, 16);
+ start_got_plt_libsimgrid = (char *)start_text_libsimgrid + offset;
+ end_got_plt_libsimgrid = (char *)start_got_plt_libsimgrid + size;
+ plt_found++;
+ }
+
+ }
+
+ }
+
+ xbt_free(command);
+ xbt_free(line);
+ pclose(fp);
+
+}
+
+void get_binary_plt_section(){
+
+ FILE *fp;
+ char *line = NULL; /* Temporal storage for each line that is readed */
+ ssize_t read; /* Number of bytes readed */
+ size_t n = 0; /* Amount of bytes to read by getline */
+
+ char *lfields[7];
+ int i, plt_found = 0;
+ unsigned long int size;
+
+ char *command = bprintf( "objdump --section-headers %s", xbt_binary_name);
+
+ fp = popen(command, "r");
+
+ if(fp == NULL){
+ perror("popen failed");
+ xbt_abort();
+ }
+
+ while ((read = getline(&line, &n, fp)) != -1 && plt_found != 2) {
+
+ if(n == 0)
+ continue;
+
+ /* Wipeout the new line character */
+ line[read - 1] = '\0';
+
+ lfields[0] = strtok(line, " ");
+
+ if(lfields[0] == NULL)
+ continue;
+
+ if(strcmp(lfields[0], "Sections:") == 0 || strcmp(lfields[0], "Idx") == 0 || strncmp(lfields[0], basename(xbt_binary_name), strlen(xbt_binary_name)) == 0)
+ continue;
+
+ for (i = 1; i < 7 && lfields[i - 1] != NULL; i++) {
+ lfields[i] = strtok(NULL, " ");
+ }
+
+ if(i>=6){
+ if(strcmp(lfields[1], ".plt") == 0){
+ size = strtoul(lfields[2], NULL, 16);
+ start_plt_binary = (void *)strtoul(lfields[3], NULL, 16);
+ end_plt_binary = (char *)start_plt_binary + size;
+ plt_found++;
+ }else if(strcmp(lfields[1], ".got.plt") == 0){
+ size = strtoul(lfields[2], NULL, 16);
+ start_got_plt_binary = (char *)strtoul(lfields[3], NULL, 16);
+ end_got_plt_binary = (char *)start_got_plt_binary + size;
+ plt_found++;
+ }
+ }
+
+
+ }
+
+ xbt_free(command);
+ xbt_free(line);
+ pclose(fp);
+
+}
+
+static void add_value(xbt_dynar_t *list, const char *type, unsigned long int val){
+ variable_value_t value = xbt_new0(s_variable_value_t, 1);
+ value->type = strdup(type);
+ if(strcmp(type, "value") == 0){
+ value->value.res = val;
+ }else{
+ value->value.address = (void *)val;
+ }
+ xbt_dynar_push(*list, &value);
+}
+
+static xbt_dynar_t take_snapshot_stacks(mc_snapshot_t *snapshot, void *heap){
+
+ xbt_dynar_t res = xbt_dynar_new(sizeof(s_mc_snapshot_stack_t), 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->local_variables = get_local_variables_values(current_stack->context, heap);
+ st->stack_pointer = get_stack_pointer(current_stack->context, heap);
+ xbt_dynar_push(res, &st);
+ (*snapshot)->stack_sizes = xbt_realloc((*snapshot)->stack_sizes, (cursor + 1) * sizeof(size_t));
+ (*snapshot)->stack_sizes[cursor] = current_stack->size - ((char *)st->stack_pointer - (char *)((char *)heap + ((char *)current_stack->address - (char *)std_heap)));
+ }
+
+ return res;
+
+}
+
+static void *get_stack_pointer(void *stack_context, void *heap){
+
+ unw_cursor_t c;
+ int ret;
+ unw_word_t sp;
+
+ ret = unw_init_local(&c, (unw_context_t *)stack_context);
+ if(ret < 0){
+ XBT_INFO("unw_init_local failed");
+ xbt_abort();
+ }
+
+ unw_get_reg(&c, UNW_REG_SP, &sp);
+
+ return ((char *)heap + (size_t)(((char *)((long)sp) - (char*)std_heap)));
+
+}
+
+static xbt_strbuff_t get_local_variables_values(void *stack_context, void *heap){
+
+ unw_cursor_t c;
+ int ret;
+
+ char frame_name[256];
+
+ ret = unw_init_local(&c, (unw_context_t *)stack_context);
+ if(ret < 0){
+ XBT_INFO("unw_init_local failed");
+ xbt_abort();
+ }
+
+ unw_word_t ip, sp, off;
+ dw_frame_t frame;
+
+ xbt_dynar_t compose = xbt_dynar_new(sizeof(variable_value_t), variable_value_free_voidp);
+
+ xbt_strbuff_t variables = xbt_strbuff_new();
+ xbt_dict_cursor_t dict_cursor;
+ char *variable_name;
+ dw_local_variable_t current_variable;
+ unsigned int cursor = 0, cursor2 = 0;
+ dw_location_entry_t entry = NULL;
+ dw_location_t location_entry = NULL;
+ unw_word_t res;
+ int frame_found = 0;
+ void *frame_pointer_address = NULL;
+ long true_ip;
+ char *to_append;
+
+ while(ret >= 0){
+
+ unw_get_reg(&c, UNW_REG_IP, &ip);
+ unw_get_reg(&c, UNW_REG_SP, &sp);
+
+ unw_get_proc_name(&c, frame_name, sizeof (frame_name), &off);
+
+ frame = xbt_dict_get_or_null(mc_local_variables, frame_name);
+
+ if(frame == NULL){
+ xbt_dynar_free(&compose);
+ xbt_dict_cursor_free(&dict_cursor);
+ return variables;
+ }
+
+ to_append = bprintf("ip=%s\n", frame_name);
+ xbt_strbuff_append(variables, to_append);
+ xbt_free(to_append);
+
+ true_ip = (long)frame->low_pc + (long)off;
+
+ /* Get frame pointer */
+ switch(frame->frame_base->type){
+ case e_dw_loclist:
+ while((cursor < xbt_dynar_length(frame->frame_base->location.loclist)) && frame_found == 0){
+ entry = xbt_dynar_get_as(frame->frame_base->location.loclist, cursor, dw_location_entry_t);
+ if((true_ip >= entry->lowpc) && (true_ip < entry->highpc)){
+ frame_found = 1;
+ switch(entry->location->type){
+ case e_dw_compose:
+ xbt_dynar_reset(compose);
+ cursor2 = 0;
+ while(cursor2 < xbt_dynar_length(entry->location->location.compose)){
+ location_entry = xbt_dynar_get_as(entry->location->location.compose, cursor2, dw_location_t);
+ switch(location_entry->type){
+ case e_dw_register:
+ unw_get_reg(&c, location_entry->location.reg, &res);
+ add_value(&compose, "address", (long)res);
+ break;
+ case e_dw_bregister_op:
+ unw_get_reg(&c, location_entry->location.breg_op.reg, &res);
+ add_value(&compose, "address", (long)res + location_entry->location.breg_op.offset);
+ break;
+ default:
+ xbt_dynar_reset(compose);
+ break;
+ }
+ cursor2++;
+ }
+
+ if(xbt_dynar_length(compose) > 0){
+ frame_pointer_address = xbt_dynar_get_as(compose, xbt_dynar_length(compose) - 1, variable_value_t)->value.address ;
+ }
+ break;
+ default :
+ frame_pointer_address = NULL;
+ break;
+ }
+ }
+ cursor++;
+ }
+ break;
+ default :
+ frame_pointer_address = NULL;
+ break;
+ }
+
+ frame_found = 0;
+ cursor = 0;
+
+ xbt_dict_foreach(frame->variables, dict_cursor, variable_name, current_variable){
+ if(current_variable->location != NULL){
+ switch(current_variable->location->type){
+ case e_dw_compose:
+ xbt_dynar_reset(compose);
+ cursor = 0;
+ while(cursor < xbt_dynar_length(current_variable->location->location.compose)){
+ location_entry = xbt_dynar_get_as(current_variable->location->location.compose, cursor, dw_location_t);
+ switch(location_entry->type){
+ case e_dw_register:
+ unw_get_reg(&c, location_entry->location.reg, &res);
+ add_value(&compose, "value", (long)res);
+ break;
+ case e_dw_bregister_op:
+ unw_get_reg(&c, location_entry->location.breg_op.reg, &res);
+ add_value(&compose, "address", (long)res + location_entry->location.breg_op.offset);
+ break;
+ case e_dw_fbregister_op:
+ if(frame_pointer_address != NULL)
+ add_value(&compose, "address", (long)((char *)frame_pointer_address + location_entry->location.fbreg_op));
+ break;
+ default:
+ xbt_dynar_reset(compose);
+ break;
+ }
+ cursor++;
+ }
+
+ if(xbt_dynar_length(compose) > 0){
+ if(strcmp(xbt_dynar_get_as(compose, xbt_dynar_length(compose) - 1, variable_value_t)->type, "value") == 0){
+ to_append = bprintf("%s=%lx\n", current_variable->name, xbt_dynar_get_as(compose, xbt_dynar_length(compose) - 1, variable_value_t)->value.res);
+ xbt_strbuff_append(variables, to_append);
+ xbt_free(to_append);
+ }else{
+ if((long)xbt_dynar_get_as(compose, xbt_dynar_length(compose) - 1,variable_value_t)->value.address < 0 || *((void**)xbt_dynar_get_as(compose, xbt_dynar_length(compose) - 1,variable_value_t)->value.address) == NULL){
+ to_append = bprintf("%s=NULL\n", current_variable->name);
+ xbt_strbuff_append(variables, to_append);
+ xbt_free(to_append);
+ }else if(((long)*((void**)xbt_dynar_get_as(compose, xbt_dynar_length(compose) - 1,variable_value_t)->value.address) > 0xffffffff) || ((long)*((void**)xbt_dynar_get_as(compose, xbt_dynar_length(compose) - 1,variable_value_t)->value.address) < (long)start_text_binary)){
+ to_append = bprintf("%s=%d\n", current_variable->name, (int)(long)*((void**)xbt_dynar_get_as(compose, xbt_dynar_length(compose) - 1, variable_value_t)->value.address));
+ xbt_strbuff_append(variables, to_append);
+ xbt_free(to_append);
+ }else{
+ to_append = bprintf("%s=%p\n", current_variable->name, *((void**)xbt_dynar_get_as(compose, xbt_dynar_length(compose) - 1, variable_value_t)->value.address));
+ xbt_strbuff_append(variables, to_append);
+ xbt_free(to_append);
+ }
+ }
+ }else{
+ to_append = bprintf("%s=undefined\n", current_variable->name);
+ xbt_strbuff_append(variables, to_append);
+ xbt_free(to_append);
+ }
+ break;
+ default :
+ break;
+ }
+ }else{
+ to_append = bprintf("%s=undefined\n", current_variable->name);
+ xbt_strbuff_append(variables, to_append);
+ xbt_free(to_append);
+ }
+ }
+
+ ret = unw_step(&c);
+
+ }
+
+ xbt_dynar_free(&compose);
+ xbt_dict_cursor_free(&dict_cursor);
+
+ return variables;
+
+}
+
+static void print_local_variables_values(xbt_dynar_t all_variables){
+
+ unsigned cursor = 0;
+ mc_snapshot_stack_t stack;
+
+ xbt_dynar_foreach(all_variables, cursor, stack){
+ XBT_INFO("%s", stack->local_variables->data);
+ }
+}
+
+
+static void snapshot_stack_free(mc_snapshot_stack_t s){
+ if(s){
+ xbt_free(s->local_variables->data);
+ xbt_free(s->local_variables);
+ xbt_free(s);
+ }
+}
+
+void snapshot_stack_free_voidp(void *s){
+ snapshot_stack_free((mc_snapshot_stack_t) * (void **) s);
+}
+
+void *MC_snapshot(void){
+
+ return simcall_mc_snapshot();
+
+}
+
+void variable_value_free(variable_value_t v){
+ if(v){
+ xbt_free(v->type);
+ xbt_free(v);
+ }
+}
+
+void variable_value_free_voidp(void* v){
+ variable_value_free((variable_value_t) * (void **)v);
+}
+
