X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/6c12a132ca10eefd1d566e489e837e459db4d979..ea9cce21b6d3f37823143217f1ca183bb2f0c9ac:/src/mc/mc_checkpoint.c diff --git a/src/mc/mc_checkpoint.c b/src/mc/mc_checkpoint.c deleted file mode 100644 index b2a0538787..0000000000 --- a/src/mc/mc_checkpoint.c +++ /dev/null @@ -1,862 +0,0 @@ -/* Copyright (c) 2008-2014. The SimGrid Team. - * All rights reserved. */ - -/* 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 - -#include - -#include -#include -#include - -#include "internal_config.h" -#include "mc_memory_map.h" -#include "mc_private.h" -#include "xbt/module.h" -#include -#include "../smpi/private.h" -#include - -#include "xbt/mmalloc/mmprivate.h" - -#include "../simix/smx_private.h" - -#include -#include - -#include "mc_private.h" -#include - -#include "mc_snapshot.h" -#include "mc_object_info.h" -#include "mc_mmu.h" -#include "mc_unw.h" -#include "mc_protocol.h" -#include "mc_smx.h" - -XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_checkpoint, mc, - "Logging specific to mc_checkpoint"); - -/************************************ Free functions **************************************/ -/*****************************************************************************************/ - -static void MC_snapshot_stack_free(mc_snapshot_stack_t s) -{ - if (s) { - xbt_dynar_free(&(s->local_variables)); - xbt_dynar_free(&(s->stack_frames)); - mc_unw_destroy_context(s->context); - xbt_free(s->context); - xbt_free(s); - } -} - -static void MC_snapshot_stack_free_voidp(void *s) -{ - mc_snapshot_stack_t stack = (mc_snapshot_stack_t) * (void **) s; - MC_snapshot_stack_free(stack); -} - -static void local_variable_free(local_variable_t v) -{ - 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 region) -{ - if (!region) - return; - 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(region); -} - -void MC_free_snapshot(mc_snapshot_t snapshot) -{ - 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); - xbt_free(snapshot); -} - -/******************************* Snapshot regions ********************************/ -/*********************************************************************************/ - -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 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); - MC_process_read(&mc_model_checker->process, MC_ADDRESS_SPACE_READ_FLAGS_NONE, - region->flat.data, permanent_addr, size, - MC_PROCESS_INDEX_DISABLED); - XBT_DEBUG("New region : type : %d, data : %p (real addr %p), size : %zu", - region_type, region->flat.data, permanent_addr, size); - return region; -} - -/** @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(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); - } 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 region, mc_mem_region_t ref_region) -{ - switch(region->storage_type) { - case MC_REGION_STORAGE_TYPE_NONE: - default: - xbt_die("Storage type not supported"); - break; - - case MC_REGION_STORAGE_TYPE_FLAT: - MC_process_write(&mc_model_checker->process, region->flat.data, - region->permanent_addr, region->size); - break; - - case MC_REGION_STORAGE_TYPE_CHUNKED: - mc_region_restore_sparse(&mc_model_checker->process, 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; - } - } -} - -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) -{ - size_t process_count = MC_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); - - // Read smpi_privatisation_regions from MCed: - smpi_privatisation_region_t remote_smpi_privatisation_regions; - MC_process_read_variable(&mc_model_checker->process, - "smpi_privatisation_regions", - &remote_smpi_privatisation_regions, sizeof(remote_smpi_privatisation_regions)); - s_smpi_privatisation_region_t privatisation_regions[process_count]; - MC_process_read_simple(&mc_model_checker->process, &privatisation_regions, - remote_smpi_privatisation_regions, sizeof(privatisation_regions)); - - 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, - privatisation_regions[i].address, size, - ref_subreg); - } - - return region; -} - -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 = MC_object_info_is_privatized(object_info); - if (privatization_aware && MC_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); - - region->object_info = object_info; - snapshot->snapshot_regions[index] = region; - return; -} - -static void MC_get_memory_regions(mc_process_t process, mc_snapshot_t snapshot) -{ - const size_t n = process->object_infos_size; - snapshot->snapshot_regions_count = n + 1; - snapshot->snapshot_regions = xbt_new0(mc_mem_region_t, n + 1); - - for (size_t i = 0; i!=n; ++i) { - mc_object_info_t object_info = 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); - } - - xbt_mheap_t heap = MC_process_get_heap(process); - void *start_heap = heap->base; - void *end_heap = 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_remote( - heap->heaplimit, - MC_process_get_malloc_info(process)); - -#ifdef HAVE_SMPI - if (smpi_privatize_global_variables && MC_smpi_process_count()) { - // snapshot->privatization_index = smpi_loaded_page - MC_process_read_variable(&mc_model_checker->process, - "smpi_loaded_page", &snapshot->privatization_index, - sizeof(snapshot->privatization_index)); - } else -#endif - { - snapshot->privatization_index = MC_PROCESS_INDEX_MISSING; - } -} - -/** \brief Fills the position of the segments (executable, read-only, read/write). - * - * `dl_iterate_phdr` would be more robust but would not work in cross-process. - * */ -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++; - } - - result->start = result->start_rw; - if ((const void*) result->start_ro > result->start) - result->start = result->start_ro; - if ((const void*) result->start_exec > result->start) - result->start = result->start_exec; - - result->end = result->end_rw; - if (result->end_ro && (const void*) result->end_ro < result->end) - result->end = result->end_ro; - if (result->end_exec && (const void*) result->end_exec > result->end) - result->end = result->end_exec; - - 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) -{ - mc_process_t process = &mc_model_checker->process; - - 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; - // FIXME, get rid of `region_type` - if ((long) stack_frame->ip > (long) process->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, - (mc_address_space_t) &mc_model_checker->process, 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(mc_unw_context_t 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); - - unw_cursor_t c; - - // TODO, check condition check (unw_init_local==0 means end of frame) - if (mc_unw_init_cursor(&c, 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_process_find_function(process, (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 = 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; - - // FIXME, cross-process support (stack_areas) - xbt_dynar_foreach(stacks_areas, cursor, current_stack) { - mc_snapshot_stack_t st = xbt_new(s_mc_snapshot_stack_t, 1); - - // Read the context from remote process: - unw_context_t context; - MC_process_read_simple(&mc_model_checker->process, - &context, (unw_context_t*) current_stack->context, sizeof(context)); - - st->context = xbt_new0(s_mc_unw_context_t, 1); - if (mc_unw_init_context(st->context, &mc_model_checker->process, - &context) < 0) { - xbt_die("Could not initialise the libunwind context."); - } - - st->stack_frames = MC_unwind_stack_frames(st->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) -{ - xbt_assert(snapshot->process); - 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_model_checker->process.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); - // TODO, we should do this once per privatization segment: - MC_process_read(snapshot->process, - MC_ADDRESS_SPACE_READ_FLAGS_NONE, - ignored_data.data, region->addr, region->size, MC_PROCESS_INDEX_DISABLED); - xbt_dynar_push(snapshot->ignored_data, &ignored_data); - } - - // Zero the memory: - xbt_dynar_foreach (mc_model_checker->process.checkpoint_ignore, cursor, region) { - MC_process_clear_memory(snapshot->process, region->addr, 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) { - MC_process_write(snapshot->process, - ignored_data.data, ignored_data.start, 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) snapshot->process->pid) > 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/%lli/fd/%s", - (long long int) snapshot->process->pid, 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; - - // If dot_output enabled, do not handle the corresponding file - if (dot_output != NULL && strcmp(basename(link), _sg_mc_dot_output_file) == 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); -} - -static s_mc_address_space_class_t mc_snapshot_class = { - .read = (void*) &MC_snapshot_read -}; - -mc_snapshot_t MC_take_snapshot(int num_state) -{ - XBT_DEBUG("Taking snapshot %i", num_state); - - mc_process_t mc_process = &mc_model_checker->process; - mc_snapshot_t snapshot = xbt_new0(s_mc_snapshot_t, 1); - snapshot->process = mc_process; - snapshot->num_state = num_state; - snapshot->address_space.address_space_class = &mc_snapshot_class; - - snapshot->enabled_processes = xbt_dynar_new(sizeof(int), NULL); - - smx_process_t process; - MC_EACH_SIMIX_PROCESS(process, - xbt_dynar_push_as(snapshot->enabled_processes, int, (int)process->pid)); - - MC_snapshot_handle_ignore(snapshot); - - if (_sg_mc_snapshot_fds) - MC_get_current_fd(snapshot); - - const bool use_soft_dirty = _sg_mc_sparse_checkpoint - && _sg_mc_soft_dirty - && MC_process_is_self(mc_process); - - /* Save the std heap and the writable mapped pages of libsimgrid and binary */ - MC_get_memory_regions(mc_process, snapshot); - if (use_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 (use_soft_dirty) - mc_model_checker->parent_snapshot = snapshot; - return snapshot; -} - -static inline -void MC_restore_snapshot_regions(mc_snapshot_t snapshot) -{ - mc_snapshot_t parent_snapshot = mc_model_checker->parent_snapshot; - - 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->snapshot_regions[i]) - MC_region_restore(snapshot->snapshot_regions[i], - parent_snapshot ? parent_snapshot->snapshot_regions[i] : NULL); - } - -#ifdef HAVE_SMPI - // TODO, send a message to implement this in the MCed process - 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) -{ - if (mc_mode == MC_MODE_SERVER) - xbt_die("FD snapshot not implemented in client/server mode."); - - 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) -{ - XBT_DEBUG("Restore snapshot %i", snapshot->num_state); - - const bool use_soft_dirty = _sg_mc_sparse_checkpoint - && _sg_mc_soft_dirty - && MC_process_is_self(&mc_model_checker->process); - - MC_restore_snapshot_regions(snapshot); - if (_sg_mc_snapshot_fds) - MC_restore_snapshot_fds(snapshot); - if (use_soft_dirty) { - mc_softdirty_reset(); - } - MC_snapshot_ignore_restore(snapshot); - if (use_soft_dirty) { - mc_model_checker->parent_snapshot = snapshot; - } - - mc_model_checker->process.cache_flags = 0; -} - -mc_snapshot_t simcall_HANDLER_mc_snapshot(smx_simcall_t simcall) -{ - return MC_take_snapshot(1); -}