#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_memory_map.h"
#include "mc_private.h"
#include "xbt/module.h"
#include <xbt/mmalloc.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_snapshot.h"
+#include "mc_object_info.h"
#include "mc_mmu.h"
XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_checkpoint, mc,
"Logging specific to mc_checkpoint");
-char *libsimgrid_path;
-
/************************************ Free functions **************************************/
/*****************************************************************************************/
local_variable_free((local_variable_t) * (void **) v);
}
-void MC_region_destroy(mc_mem_region_t reg)
+void MC_region_destroy(mc_mem_region_t region)
{
- if (reg)
+ if (!region)
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));
+ switch(region->storage_type) {
+ case MC_REGION_STORAGE_TYPE_NONE:
+ break;
+ case MC_REGION_STORAGE_TYPE_FLAT:
+ xbt_free(region->flat.data);
+ break;
+ case MC_REGION_STORAGE_TYPE_CHUNKED:
+ mc_free_page_snapshot_region(region->chunked.page_numbers, mc_page_count(region->size));
+ xbt_free(region->chunked.page_numbers);
+ break;
+ case MC_REGION_STORAGE_TYPE_PRIVATIZED:
+ {
+ size_t regions_count = region->privatized.regions_count;
+ for (size_t i=0; i!=regions_count; ++i) {
+ MC_region_destroy(region->privatized.regions[i]);
+ }
+ free(region->privatized.regions);
+ break;
+ }
}
- xbt_free(reg);
+ xbt_free(region);
}
void MC_free_snapshot(mc_snapshot_t snapshot)
{
- unsigned int i;
- for (i = 0; i < NB_REGIONS; i++) {
- MC_region_destroy(snapshot->regions[i]);
+ for (size_t i = 0; i < snapshot->snapshot_regions_count; i++) {
+ MC_region_destroy(snapshot->snapshot_regions[i]);
}
-
+ xbt_free(snapshot->snapshot_regions);
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)
+static mc_mem_region_t mc_region_new_dense(
+ mc_region_type_t region_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);
+ mc_mem_region_t region = xbt_new(s_mc_mem_region_t, 1);
+ region->region_type = region_type;
+ region->storage_type = MC_REGION_STORAGE_TYPE_FLAT;
+ region->start_addr = start_addr;
+ region->permanent_addr = permanent_addr;
+ region->size = size;
+ region->flat.data = xbt_malloc(size);
+ memcpy(region->flat.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;
-
+ region_type, region->flat.data, permanent_addr, size);
+ return region;
}
/** @brief Take a snapshot of a given region
* @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)
+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)
{
if (_sg_mc_sparse_checkpoint) {
return mc_region_new_sparse(type, start_addr, permanent_addr, size, ref_reg);
* @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)
+static void MC_region_restore(mc_mem_region_t region, mc_mem_region_t ref_region)
{
- /*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);
+ switch(region->storage_type) {
+ case MC_REGION_STORAGE_TYPE_NONE:
+ default:
+ xbt_die("Storage type not supported");
+ break;
+
+ case MC_REGION_STORAGE_TYPE_FLAT:
+ memcpy(region->permanent_addr, region->flat.data, region->size);
+ break;
+
+ case MC_REGION_STORAGE_TYPE_CHUNKED:
+ mc_region_restore_sparse(region, ref_region);
+ break;
+
+ case MC_REGION_STORAGE_TYPE_PRIVATIZED:
+ {
+ bool has_ref_regions = ref_region &&
+ ref_region->storage_type == MC_REGION_STORAGE_TYPE_PRIVATIZED;
+ size_t process_count = region->privatized.regions_count;
+ for (size_t i = 0; i < process_count; i++) {
+ MC_region_restore(region->privatized.regions[i],
+ has_ref_regions ? ref_region->privatized.regions[i] : NULL);
+ }
+ break;
+ }
}
- return;
}
-static void MC_snapshot_add_region(mc_snapshot_t snapshot, int type,
- void *start_addr, void* permanent_addr, size_t size)
-
+static inline
+void* MC_privatization_address(mc_process_t process, int process_index)
{
- 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, start_addr, size, ref_reg);
- snapshot->regions[type] = new_reg;
- return;
+ xbt_assert(process_index >= 0);
+ return smpi_privatisation_regions[process_index].address;
}
-static void MC_get_memory_regions(mc_snapshot_t snapshot)
+static mc_mem_region_t MC_region_new_privatized(
+ mc_region_type_t region_type, void *start_addr, void* permanent_addr, size_t size,
+ mc_mem_region_t ref_reg)
{
-
- void *start_heap = ((xbt_mheap_t) std_heap)->base;
- void *end_heap = ((xbt_mheap_t) 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, mappings[i], size_data_exe, ref_reg);
- }
- snapshot->privatization_index = 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;
+ size_t process_count = smpi_process_count();
+ mc_mem_region_t region = xbt_new(s_mc_mem_region_t, 1);
+ region->region_type = region_type;
+ region->storage_type = MC_REGION_STORAGE_TYPE_PRIVATIZED;
+ region->start_addr = start_addr;
+ region->permanent_addr = permanent_addr;
+ region->size = size;
+ region->privatized.regions_count = process_count;
+ region->privatized.regions = xbt_new(mc_mem_region_t, process_count);
+
+ for (size_t i = 0; i < process_count; i++) {
+ mc_mem_region_t ref_subreg = NULL;
+ if (ref_reg && ref_reg->storage_type == MC_REGION_STORAGE_TYPE_PRIVATIZED)
+ ref_subreg = ref_reg->privatized.regions[i];
+ region->privatized.regions[i] =
+ MC_region_new(region_type, start_addr,
+ MC_privatization_address(&mc_model_checker->process, i), size,
+ ref_subreg);
}
+
+ return region;
}
-/** @brief Finds the range of the different memory segments and binary paths */
-void MC_init_memory_map_info()
+static void MC_snapshot_add_region(int index, mc_snapshot_t snapshot, mc_region_type_t type,
+ mc_object_info_t object_info,
+ void *start_addr, void* permanent_addr, size_t size)
{
+ if (type == MC_REGION_TYPE_DATA)
+ xbt_assert(object_info, "Missing object info for object.");
+ else if (type == MC_REGION_TYPE_HEAP)
+ xbt_assert(!object_info, "Unexpected object info for heap region.");
+
+ mc_mem_region_t ref_reg = NULL;
+ if (mc_model_checker->parent_snapshot)
+ ref_reg = mc_model_checker->parent_snapshot->snapshot_regions[index];
+
+ mc_mem_region_t region;
+ const bool privatization_aware = object_info && MC_object_info_executable(object_info);
+ if (privatization_aware && smpi_privatize_global_variables && smpi_process_count())
+ region = MC_region_new_privatized(type, start_addr, permanent_addr, size, ref_reg);
+ else
+ region = MC_region_new(type, start_addr, permanent_addr, size, ref_reg);
- 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);
-
+ region->object_info = object_info;
+ snapshot->snapshot_regions[index] = region;
+ return;
}
-/** \brief Fill/lookup the "subtype" field.
- */
-static void MC_resolve_subtype(mc_object_info_t info, dw_type_t type)
+static void MC_get_memory_regions(mc_snapshot_t snapshot)
{
+ const mc_process_t process = &mc_model_checker->process;
+ const size_t n = process->object_infos_size;
- if (type->dw_type_id == NULL)
- return;
- type->subtype = xbt_dict_get_or_null(info->types, type->dw_type_id);
- if (type->subtype == NULL)
- return;
- if (type->subtype->byte_size != 0)
- return;
- if (type->subtype->name == NULL)
- return;
- // Try to find a more complete description of the type:
- // We need to fix in order to support C++.
+ snapshot->snapshot_regions_count = n + 1;
+ snapshot->snapshot_regions = xbt_new0(mc_mem_region_t, n + 1);
- dw_type_t subtype =
- xbt_dict_get_or_null(info->full_types_by_name, type->subtype->name);
- if (subtype != NULL) {
- type->subtype = subtype;
+ for (size_t i = 0; i!=n; ++i) {
+ mc_object_info_t object_info = mc_model_checker->process.object_infos[i];
+ MC_snapshot_add_region(i, snapshot, MC_REGION_TYPE_DATA, object_info,
+ object_info->start_rw, object_info->start_rw,
+ object_info->end_rw - object_info->start_rw);
}
-}
+ void *start_heap = std_heap->base;
+ void *end_heap = std_heap->breakval;
+ MC_snapshot_add_region(n, snapshot, MC_REGION_TYPE_HEAP, NULL,
+ start_heap, start_heap,
+ (char *) end_heap - (char *) start_heap);
+ snapshot->heap_bytes_used = mmalloc_get_bytes_used(std_heap);
-void MC_post_process_types(mc_object_info_t info)
-{
- xbt_dict_cursor_t cursor = NULL;
- char *origin;
- dw_type_t type;
-
- // Lookup "subtype" field:
- xbt_dict_foreach(info->types, cursor, origin, type) {
- MC_resolve_subtype(info, type);
-
- dw_type_t member;
- unsigned int i = 0;
- if (type->members != NULL)
- xbt_dynar_foreach(type->members, i, member) {
- MC_resolve_subtype(info, member);
- }
+#ifdef HAVE_SMPI
+ if (smpi_privatize_global_variables && smpi_process_count()) {
+ snapshot->privatization_index = smpi_loaded_page;
+ } else
+#endif
+ {
+ snapshot->privatization_index = MC_NO_PROCESS_INDEX;
}
}
* */
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);
static void mc_fill_local_variables_values(mc_stack_frame_t stack_frame,
dw_frame_t scope, int process_index, xbt_dynar_t result)
{
+ mc_process_t process = &mc_model_checker->process;
+
void *ip = (void *) stack_frame->ip;
if (ip < scope->low_pc || ip >= scope->high_pc)
return;
continue;
int region_type;
- if ((long) stack_frame->ip > (long) mc_libsimgrid_info->start_exec)
+ if ((long) stack_frame->ip > (long) process->libsimgrid_info->start_exec)
region_type = 1;
else
region_type = 2;
if (current_variable->address != NULL) {
new_var->address = current_variable->address;
} else if (current_variable->locations.size != 0) {
- new_var->address =
- (void *) mc_dwarf_resolve_locations(¤t_variable->locations,
+ 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");
}
static xbt_dynar_t MC_unwind_stack_frames(void *stack_context)
{
+ mc_process_t process = &mc_model_checker->process;
xbt_dynar_t result =
xbt_dynar_new(sizeof(mc_stack_frame_t), MC_stack_frame_free_voipd);
// TODO, use real addresses in frame_t instead of fixing it here
- dw_frame_t frame = MC_find_function_by_ip((void *) ip);
+ dw_frame_t frame = MC_process_find_function(process, (void *) ip);
stack_frame->frame = frame;
if (frame) {
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:
+ // 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) {
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) {
return snapshot;
}
-void MC_restore_snapshot(mc_snapshot_t snapshot)
+static inline
+void MC_restore_snapshot_regions(mc_snapshot_t snapshot)
{
mc_snapshot_t parent_snapshot = mc_model_checker->parent_snapshot;
- unsigned int i;
- for (i = 0; i < NB_REGIONS; i++) {
+ const size_t n = snapshot->snapshot_regions_count;
+ for (size_t i = 0; i < n; 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);
+ if (snapshot->snapshot_regions[i])
+ MC_region_restore(snapshot->snapshot_regions[i],
+ parent_snapshot ? parent_snapshot->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);
- }
- }
- switch_data_segment(snapshot->privatization_index);
+ 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
+}
+static inline
+void MC_restore_snapshot_fds(mc_snapshot_t snapshot)
+{
+ int new_fd;
+ size_t i;
+ 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);
+ }
+}
+
+void MC_restore_snapshot(mc_snapshot_t snapshot)
+{
+ MC_restore_snapshot_regions(snapshot);
+ MC_restore_snapshot_fds(snapshot);
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 SIMIX_pre_mc_snapshot(smx_simcall_t simcall)
+mc_snapshot_t simcall_HANDLER_mc_snapshot(smx_simcall_t simcall)
{
return MC_take_snapshot(1);
}
