+++ /dev/null
-/* 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 <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 "../smpi/private.h"
-#include <alloca.h>
-
-#include "xbt/mmalloc/mmprivate.h"
-
-#include "../simix/smx_private.h"
-
-#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"
-#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);
-}
