-/* Copyright (c) 2008-2012 Da SimGrid Team. All rights reserved. */
+/* 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. */
-#include <libgen.h>
+#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>
-XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_checkpoint, mc,
- "Logging specific to mc_checkpoint");
+#include "mc_private.h"
+#include <mc/mc.h>
-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;
+#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"
-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);
+XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_checkpoint, mc,
+ "Logging specific to mc_checkpoint");
-static void MC_snapshot_add_region(mc_snapshot_t snapshot, int type, void *start_addr, size_t size);
+/************************************ Free functions **************************************/
+/*****************************************************************************************/
-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 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 snapshot_stack_free(mc_snapshot_stack_t s);
-static xbt_dynar_t take_snapshot_ignore(void);
+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 mc_mem_region_t MC_region_new(int type, void *start_addr, size_t size)
+static void local_variable_free(local_variable_t v)
{
- mc_mem_region_t new_reg = xbt_new0(s_mc_mem_region_t, 1);
- new_reg->type = type;
- new_reg->start_addr = start_addr;
- new_reg->size = size;
- new_reg->data = xbt_malloc0(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;
+ xbt_free(v->name);
+ xbt_free(v);
}
-static void MC_region_restore(mc_mem_region_t reg)
+static void local_variable_free_voidp(void *v)
{
- /*FIXME: check if start_addr is still mapped, if it is not, then map it
- before copying the data */
-
- memcpy(reg->start_addr, reg->data, reg->size);
-
- return;
+ local_variable_free((local_variable_t) * (void **) v);
}
-static void MC_region_destroy(mc_mem_region_t reg)
+void MC_region_destroy(mc_mem_region_t region)
{
- xbt_free(reg->data);
- xbt_free(reg);
+ 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);
}
-static void MC_snapshot_add_region(mc_snapshot_t snapshot, int type, void *start_addr, size_t size)
+void MC_free_snapshot(mc_snapshot_t snapshot)
{
- 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;
-}
+ 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);
+}
-void MC_init_memory_map_info(){
+/******************************* Snapshot regions ********************************/
+/*********************************************************************************/
- int raw_mem_set = (mmalloc_get_current_heap() == raw_heap);
+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;
+}
- MC_SET_RAW_MEM;
-
- unsigned int i = 0;
- s_map_region_t reg;
- memory_map_t maps = get_memory_map();
+/** @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);
+ }
+}
- while (i < maps->mapsize) {
- reg = maps->regions[i];
- if ((reg.prot & PROT_WRITE)){
- 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, "[stack]", 7)){
- maestro_stack_start = reg.start_addr;
- maestro_stack_end = reg.end_addr;
- i++;
- }
- }
- }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)){
- 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;
- }
+/** @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;
}
- i++;
}
-
- free_memory_map(maps);
-
- MC_UNSET_RAW_MEM;
+}
- if(raw_mem_set)
- MC_SET_RAW_MEM;
+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;
}
-mc_snapshot_t SIMIX_pre_mc_snapshot(smx_simcall_t simcall){
- return MC_take_snapshot();
+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;
}
-mc_snapshot_t MC_take_snapshot()
+static void MC_get_memory_regions(mc_process_t process, mc_snapshot_t snapshot)
{
- int raw_mem = (mmalloc_get_current_heap() == raw_heap);
-
- MC_SET_RAW_MEM;
+ 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);
+ }
- mc_snapshot_t snapshot = xbt_new0(s_mc_snapshot_t, 1);
- snapshot->nb_processes = xbt_swag_size(simix_global->process_list);
+ 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;
- memory_map_t maps = get_memory_map();
- void *heap = NULL;
- size_t size = 0;
- void *start = NULL;
-
- /* Save the std heap and the writable mapped pages of libsimgrid */
+ const char *name = basename(result->file_name);
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);
- snapshot->heap_bytes_used = mmalloc_get_bytes_used(std_heap);
- heap = snapshot->regions[snapshot->num_reg - 1]->data;
- }
- i++;
- } else{
- if (!memcmp(basename(maps->regions[i].pathname), "libsimgrid", 10)){
- size = (char*)reg.end_addr - (char*)reg.start_addr;
- start = reg.start_addr;
- 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, "[stack]", 7)){
- maestro_stack_start = reg.start_addr;
- maestro_stack_end = 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;
- 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++;
- }
+ 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{
- i++;
+ } 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++;
}
- snapshot->to_ignore = take_snapshot_ignore();
+ 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);
+}
- if(_sg_mc_visited > 0 || strcmp(_sg_mc_property_file,""))
- snapshot->stacks = take_snapshot_stacks(&snapshot, heap);
-
- free_memory_map(maps);
+/************************************* 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;
+}
- MC_UNSET_RAW_MEM;
+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;
- if(raw_mem)
- MC_SET_RAW_MEM;
+ void *ip = (void *) stack_frame->ip;
+ if (ip < scope->low_pc || ip >= scope->high_pc)
+ return;
- return snapshot;
+ 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;
-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]);
+ 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;
+ // FIXME, cross-process support
+ mc_dwarf_resolve_locations(&location, ¤t_variable->locations,
+ current_variable->object_info,
+ &(stack_frame->unw_cursor),
+ (void *) stack_frame->frame_base,
+ NULL, process_index);
+
+ switch(mc_get_location_type(&location)) {
+ case MC_LOCATION_TYPE_ADDRESS:
+ new_var->address = location.memory_location;
+ break;
+ case MC_LOCATION_TYPE_REGISTER:
+ default:
+ xbt_die("Cannot handle non-address variable");
+ }
+
+ } else {
+ xbt_die("No address");
+ }
+
+ xbt_dynar_push(result, &new_var);
}
+ // Recursive processing of nested scopes:
+ dw_frame_t nested_scope = NULL;
+ xbt_dynar_foreach(scope->scopes, cursor, nested_scope) {
+ mc_fill_local_variables_values(stack_frame, nested_scope, process_index, result);
+ }
}
-void MC_free_snapshot(mc_snapshot_t snapshot)
+static xbt_dynar_t MC_get_local_variables_values(xbt_dynar_t stack_frames, int process_index)
{
- unsigned int i;
- for(i=0; i < snapshot->num_reg; i++)
- MC_region_destroy(snapshot->regions[i]);
- xbt_free(snapshot->regions);
- xbt_dynar_free(&(snapshot->stacks));
- xbt_dynar_free(&(snapshot->to_ignore));
- xbt_free(snapshot);
+ 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);
+ }
+}
-void get_libsimgrid_plt_section(){
+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);
- 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 xbt_getline */
+ unw_cursor_t c;
- char *lfields[7];
- int i, plt_found = 0;
- unsigned long int size, offset;
+ // TODO, check condition check (unw_init_local==0 means end of frame)
+ if (mc_unw_init_cursor(&c, stack_context) != 0) {
- char *command = bprintf("objdump --section-headers %s", libsimgrid_path);
+ xbt_die("Could not initialize stack unwinding");
- fp = popen(command, "r");
+ } else
+ while (1) {
- if(fp == NULL){
- perror("popen failed");
- xbt_abort();
- }
+ mc_stack_frame_t stack_frame = xbt_new(s_mc_stack_frame_t, 1);
+ xbt_dynar_push(result, &stack_frame);
- while ((read = xbt_getline(&line, &n, fp)) != -1 && plt_found != 2) {
+ stack_frame->unw_cursor = c;
- if(n == 0)
- continue;
+ unw_word_t ip, sp;
- /* Wipeout the new line character */
- line[read - 1] = '\0';
+ unw_get_reg(&c, UNW_REG_IP, &ip);
+ unw_get_reg(&c, UNW_REG_SP, &sp);
- lfields[0] = strtok(line, " ");
+ stack_frame->ip = ip;
+ stack_frame->sp = sp;
- if(lfields[0] == NULL)
- continue;
+ // TODO, use real addresses in frame_t instead of fixing it here
- if(strcmp(lfields[0], "Sections:") == 0 || strcmp(lfields[0], "Idx") == 0 || strncmp(lfields[0], libsimgrid_path, strlen(libsimgrid_path)) == 0)
- continue;
+ dw_frame_t frame = MC_process_find_function(process, (void *) ip);
+ stack_frame->frame = frame;
- for (i = 1; i < 7 && lfields[i - 1] != NULL; i++) {
- lfields[i] = strtok(NULL, " ");
- }
+ 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;
+ }
- 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++;
- }
+ /* 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();
}
- xbt_free(command);
- xbt_free(line);
- pclose(fp);
+ return result;
+};
-}
+static xbt_dynar_t MC_take_snapshot_stacks(mc_snapshot_t * snapshot)
+{
-void get_binary_plt_section(){
+ xbt_dynar_t res =
+ xbt_dynar_new(sizeof(s_mc_snapshot_stack_t),
+ MC_snapshot_stack_free_voidp);
- 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 xbt_getline */
+ unsigned int cursor = 0;
+ stack_region_t current_stack;
- char *lfields[7];
- int i, plt_found = 0;
- unsigned long int size;
+ // 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);
- char *command = bprintf( "objdump --section-headers %s", xbt_binary_name);
+ unw_context_t* original_context = (unw_context_t*) current_stack->context;
- fp = popen(command, "r");
+ st->context = xbt_new0(s_mc_unw_context_t, 1);
+ if (mc_unw_init_context(st->context, &mc_model_checker->process,
+ original_context) < 0) {
+ xbt_die("Could not initialise the libunwind context.");
+ }
- if(fp == NULL){
- perror("popen failed");
- xbt_abort();
- }
+ 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;
- while ((read = xbt_getline(&line, &n, fp)) != -1 && plt_found != 2) {
+ unw_word_t sp = xbt_dynar_get_as(st->stack_frames, 0, mc_stack_frame_t)->sp;
- if(n == 0)
- continue;
+ 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;
+ }
- /* Wipeout the new line character */
- line[read - 1] = '\0';
+ return res;
- lfields[0] = strtok(line, " ");
+}
- if(lfields[0] == NULL)
- continue;
+static xbt_dynar_t MC_take_snapshot_ignore()
+{
- if(strcmp(lfields[0], "Sections:") == 0 || strcmp(lfields[0], "Idx") == 0 || strncmp(lfields[0], basename(xbt_binary_name), strlen(xbt_binary_name)) == 0)
- continue;
+ if (mc_heap_comparison_ignore == NULL)
+ return NULL;
- for (i = 1; i < 7 && lfields[i - 1] != NULL; i++) {
- lfields[i] = strtok(NULL, " ");
- }
+ xbt_dynar_t cpy =
+ xbt_dynar_new(sizeof(mc_heap_ignore_region_t),
+ heap_ignore_region_free_voidp);
- 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++;
- }
- }
-
-
+ 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);
}
- xbt_free(command);
- xbt_free(line);
- pclose(fp);
+ return cpy;
}
-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 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 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);
+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;
- 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)));
+ 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);
}
- return res;
+ // 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 *get_stack_pointer(void *stack_context, void *heap){
+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);
+ }
+}
- unw_cursor_t c;
- int ret;
- unw_word_t sp;
+/** @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;
+}
- ret = unw_init_local(&c, (unw_context_t *)stack_context);
- if(ret < 0){
- XBT_INFO("unw_init_local failed");
- xbt_abort();
- }
+static void MC_get_current_fd(mc_snapshot_t snapshot)
+{
- unw_get_reg(&c, UNW_REG_SP, &sp);
+ snapshot->total_fd = 0;
- return ((char *)heap + (size_t)(((char *)((long)sp) - (char*)std_heap)));
+ 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");
-static xbt_strbuff_t get_local_variables_values(void *stack_context, void *heap){
-
- unw_cursor_t c;
- int ret;
+ size_t total_fd = 0;
+ struct dirent* fd_number;
+ while ((fd_number = readdir(fd_dir))) {
- 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();
- }
+ int fd_value = atoi(fd_number->d_name);
- 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;
- }
+ if(fd_value < 3)
+ continue;
- to_append = bprintf("ip=%lx\n", ip);
- xbt_strbuff_append(variables, to_append);
- xbt_free(to_append);
- to_append = bprintf("frame_name=%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_is_empty(compose)){
- 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;
+ 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';
- 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_is_empty(compose)){
- 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=%u\n", current_variable->name, (unsigned 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);
+ if(smpi_is_privatisation_file(link))
+ continue;
- return variables;
+ // 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;
-static void print_local_variables_values(xbt_dynar_t all_variables){
+ // If dot_output enabled, do not handle the corresponding file
+ if (dot_output != NULL && strcmp(basename(link), _sg_mc_dot_output_file) == 0)
+ continue;
- unsigned cursor = 0;
- mc_snapshot_stack_t stack;
+ // This is probably a shared memory used by lttng-ust:
+ if(strncmp("/dev/shm/ust-shm-tmp-", link, 21)==0)
+ continue;
- xbt_dynar_foreach(all_variables, cursor, stack){
- XBT_INFO("%s", stack->local_variables->data);
+ // 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
+};
-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);
- }
-}
+mc_snapshot_t MC_take_snapshot(int 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->address_space.address_space_class = &mc_snapshot_class;
-void snapshot_stack_free_voidp(void *s){
- snapshot_stack_free((mc_snapshot_stack_t) * (void **) s);
-}
+ snapshot->enabled_processes = xbt_dynar_new(sizeof(int), NULL);
-void *MC_snapshot(void){
+ smx_process_t process;
+ MC_EACH_SIMIX_PROCESS(process,
+ xbt_dynar_push_as(snapshot->enabled_processes, int, (int)process->pid));
- return simcall_mc_snapshot();
-
-}
+ MC_snapshot_handle_ignore(snapshot);
+
+ if (_sg_mc_snapshot_fds)
+ MC_get_current_fd(snapshot);
-void variable_value_free(variable_value_t v){
- if(v){
- xbt_free(v->type);
- xbt_free(v);
+ 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;
}
-}
-void variable_value_free_voidp(void* v){
- variable_value_free((variable_value_t) * (void **)v);
+ MC_snapshot_ignore_restore(snapshot);
+ if (use_soft_dirty)
+ mc_model_checker->parent_snapshot = snapshot;
+ return snapshot;
}
-static xbt_dynar_t take_snapshot_ignore(){
-
- if(mc_heap_comparison_ignore == NULL)
- return NULL;
+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);
+ }
- xbt_dynar_t cpy = xbt_dynar_new(sizeof(mc_heap_ignore_region_t), heap_ignore_region_free_voidp);
+#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
+}
- unsigned int cursor = 0;
- mc_heap_ignore_region_t current_region;
+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.");
- 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);
+ 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);
}
+}
- return cpy;
+void MC_restore_snapshot(mc_snapshot_t snapshot)
+{
+ 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);
}
