* under the terms of the license (GNU LGPL) which comes with this package. */
#define _GNU_SOURCE
-#define UNW_LOCAL_ONLY
+
+#include <unistd.h>
#include <string.h>
#include <link.h>
+#include <dirent.h>
+
+#include "internal_config.h"
+#include "mc_memory_map.h"
#include "mc_private.h"
#include "xbt/module.h"
#include <xbt/mmalloc.h>
#include "../smpi/private.h"
+#include <alloca.h>
#include "xbt/mmalloc/mmprivate.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");
-char *libsimgrid_path;
-
/************************************ Free functions **************************************/
/*****************************************************************************************/
-static void MC_snapshot_stack_free(mc_snapshot_stack_t s){
- if(s){
+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_free((mc_snapshot_stack_t) * (void **) 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){
+static void local_variable_free(local_variable_t v)
+{
xbt_free(v->name);
xbt_free(v);
}
-static void local_variable_free_voidp(void *v){
+static void local_variable_free_voidp(void *v)
+{
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)
{
- munmap(reg->data, reg->size);
- 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);
}
-void MC_free_snapshot(mc_snapshot_t snapshot){
- unsigned int i;
- for(i=0; i < NB_REGIONS; i++)
- MC_region_destroy(snapshot->regions[i]);
-
+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));
-
- if(snapshot->privatization_regions){
- size_t n = snapshot->nb_processes;
- for(i=0; i!=n; ++i) {
- MC_region_destroy(snapshot->privatization_regions[i]);
- }
- xbt_free(snapshot->privatization_regions);
- }
-
+ xbt_dynar_free(&snapshot->ignored_data);
xbt_free(snapshot);
}
-
/******************************* Snapshot regions ********************************/
/*********************************************************************************/
-static mc_mem_region_t MC_region_new(int type, void *start_addr, size_t size)
+static mc_mem_region_t mc_region_new_dense(
+ mc_region_type_t region_type,
+ void *start_addr, void* permanent_addr, size_t size, mc_mem_region_t ref_reg)
{
- mc_mem_region_t new_reg = xbt_new(s_mc_mem_region_t, 1);
- new_reg->start_addr = start_addr;
- new_reg->size = size;
- new_reg->data = mmap(NULL, size, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
- memcpy(new_reg->data, start_addr, size);
- mprotect(new_reg->data, size, PROT_READ);
- madvise(new_reg->data, size, MADV_MERGEABLE);
-
- XBT_DEBUG("New region : type : %d, data : %p (real addr %p), size : %zu", type, new_reg->data, start_addr, size);
-
- return new_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;
}
-static void MC_region_restore(mc_mem_region_t reg)
+/** @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)
{
- /*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;
+ 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);
+ }
}
-static void MC_snapshot_add_region(mc_snapshot_t snapshot, int type, void *start_addr, size_t size)
+/** @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)
{
- mc_mem_region_t new_reg = MC_region_new(type, start_addr, size);
- snapshot->regions[type] = new_reg;
- return;
-}
-
-static void MC_get_memory_regions(mc_snapshot_t snapshot){
- size_t i;
-
- void* start_heap = ((xbt_mheap_t)std_heap)->base;
- void* end_heap = ((xbt_mheap_t)std_heap)->breakval;
- MC_snapshot_add_region(snapshot, 0, start_heap, (char*) end_heap - (char*) start_heap);
- snapshot->heap_bytes_used = mmalloc_get_bytes_used(std_heap);
-
- MC_snapshot_add_region(snapshot, 1, mc_libsimgrid_info->start_rw, mc_libsimgrid_info->end_rw - mc_libsimgrid_info->start_rw);
- if(!smpi_privatize_global_variables) {
- MC_snapshot_add_region(snapshot, 2, mc_binary_info->start_rw, mc_binary_info->end_rw - mc_binary_info->start_rw);
- snapshot->privatization_regions = NULL;
- snapshot->privatization_index = -1;
- } else {
- snapshot->privatization_regions = xbt_new(mc_mem_region_t, SIMIX_process_count());
- for (i=0; i< SIMIX_process_count(); i++){
- snapshot->privatization_regions[i] = MC_region_new(-1, mappings[i], size_data_exe);
+ 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;
}
- snapshot->privatization_index = loaded_page;
}
}
-/** @brief Finds the range of the different memory segments and binary paths */
-void MC_init_memory_map_info(){
-
- unsigned int i = 0;
- s_map_region_t reg;
- memory_map_t maps = MC_get_memory_map();
-
- maestro_stack_start = NULL;
- maestro_stack_end = NULL;
- libsimgrid_path = NULL;
-
- while (i < maps->mapsize) {
- reg = maps->regions[i];
- if (maps->regions[i].pathname == NULL) {
- // Nothing to do
- }
- else if ((reg.prot & PROT_WRITE) && !memcmp(maps->regions[i].pathname, "[stack]", 7)){
- maestro_stack_start = reg.start_addr;
- maestro_stack_end = reg.end_addr;
- } else if ((reg.prot & PROT_READ) && (reg.prot & PROT_EXEC) && !memcmp(basename(maps->regions[i].pathname), "libsimgrid", 10)){
- if(libsimgrid_path == NULL)
- libsimgrid_path = strdup(maps->regions[i].pathname);
- }
- i++;
+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);
}
- xbt_assert(maestro_stack_start, "maestro_stack_start");
- xbt_assert(maestro_stack_end, "maestro_stack_end");
- xbt_assert(libsimgrid_path, "libsimgrid_path&");
-
- MC_free_memory_map(maps);
-
+ return region;
}
-/** \brief Fill/lookup the "subtype" field.
- */
-static void MC_resolve_subtype(mc_object_info_t info, dw_type_t type) {
-
- if(type->dw_type_id==NULL)
- return;
- type->subtype = xbt_dict_get_or_null(info->types, type->dw_type_id);
- if(type->subtype==NULL)
- return;
- if(type->subtype->byte_size != 0)
- return;
- if(type->subtype->name==NULL)
- return;
- // Try to find a more complete description of the type:
- // We need to fix in order to support C++.
-
- dw_type_t subtype = xbt_dict_get_or_null(info->full_types_by_name, type->subtype->name);
- if(subtype!=NULL) {
- type->subtype = subtype;
- }
+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;
}
-void MC_post_process_types(mc_object_info_t info) {
- xbt_dict_cursor_t cursor = NULL;
- char *origin;
- dw_type_t type;
-
- // Lookup "subtype" field:
- xbt_dict_foreach(info->types, cursor, origin, type){
- MC_resolve_subtype(info, type);
+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);
+ }
- dw_type_t member;
- unsigned int i = 0;
- if(type->members!=NULL) xbt_dynar_foreach(type->members, i, member) {
- MC_resolve_subtype(info, member);
- }
+ 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).
*
- * TODO, use dl_iterate_phdr to be more robust
+ * `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) {
-
+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);
+ 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)) {
+ 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;
+ } 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);
* \param ip Instruction pointer
* \return true if the variable is valid
* */
-static bool mc_valid_variable(dw_variable_t var, dw_frame_t frame, const void* ip) {
+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*) frame->low_pc + var->start_scope) > ip)
+ 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, xbt_dynar_t result) {
- void* ip = (void*) stack_frame->ip;
- if(ip < scope->low_pc || ip>= scope->high_pc)
+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){
+ xbt_dynar_foreach(scope->variables, cursor, current_variable) {
- if(!mc_valid_variable(current_variable, stack_frame->frame, (void*) stack_frame->ip))
+ if (!mc_valid_variable(current_variable, scope, (void *) stack_frame->ip))
continue;
int region_type;
- if((long)stack_frame->ip > (long)mc_libsimgrid_info->start_exec)
+ // FIXME, get rid of `region_type`
+ if ((long) stack_frame->ip > (long) process->libsimgrid_info->start_exec)
region_type = 1;
else
region_type = 2;
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;
+ new_var->region = region_type;
- /* if(current_variable->address!=NULL) {
+ if (current_variable->address != NULL) {
new_var->address = current_variable->address;
- } else */
- if(current_variable->locations.size != 0){
- new_var->address = (void*) mc_dwarf_resolve_locations(¤t_variable->locations,
- current_variable->object_info,
- &(stack_frame->unw_cursor), (void*)stack_frame->frame_base, NULL);
+ } 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, result);
+ 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){
+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_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, variables);
+ 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) {
+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(void *stack_context) {
- xbt_dynar_t result = xbt_dynar_new(sizeof(mc_stack_frame_t), MC_stack_frame_free_voipd);
+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(unw_init_local(&c, (unw_context_t *)stack_context)!=0) {
+ if (mc_unw_init_cursor(&c, stack_context) != 0) {
xbt_die("Could not initialize stack unwinding");
- } else while(1) {
+ } else
+ while (1) {
- mc_stack_frame_t stack_frame = xbt_new(s_mc_stack_frame_t, 1);
- xbt_dynar_push(result, &stack_frame);
+ 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;
+ stack_frame->unw_cursor = c;
- unw_word_t ip, sp;
+ unw_word_t ip, sp;
- unw_get_reg(&c, UNW_REG_IP, &ip);
- unw_get_reg(&c, UNW_REG_SP, &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;
+ stack_frame->ip = ip;
+ stack_frame->sp = sp;
- // TODO, use real addresses in frame_t instead of fixing it here
+ // TODO, use real addresses in frame_t instead of fixing it here
- dw_frame_t frame = MC_find_function_by_ip((void*) ip);
- stack_frame->frame = frame;
+ 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;
- }
+ 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;
+ /* Stop before context switch with maestro */
+ if (frame != NULL && frame->name != NULL
+ && !strcmp(frame->name, "smx_ctx_sysv_wrapper"))
+ break;
- int ret = ret = unw_step(&c);
- if(ret==0) {
- xbt_die("Unexpected end of stack.");
- } else if(ret<0) {
- xbt_die("Error while unwinding stack.");
+ 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){
+ 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, void *heap){
+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);
+ 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;
-
- xbt_dynar_foreach(stacks_areas, cursor, 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);
- st->stack_frames = MC_unwind_stack_frames(current_stack->context);
- st->local_variables = MC_get_local_variables_values(st->stack_frames);
+
+ unw_context_t* original_context = (unw_context_t*) current_stack->context;
+
+ 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.");
+ }
+
+ 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;
- st->stack_pointer = ((char *)heap + (size_t)(((char *)((long)sp) - (char*)std_heap)));
- st->real_address = current_stack->address;
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)));
+ (*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)
+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);
+ 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){
+ 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;
}
-static void MC_dump_checkpoint_ignore(mc_snapshot_t snapshot){
-
+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;
- size_t offset;
-
- xbt_dynar_foreach(mc_checkpoint_ignore, cursor, region){
- if(region->addr > snapshot->regions[0]->start_addr && (char *)(region->addr) < (char *)snapshot->regions[0]->start_addr + STD_HEAP_SIZE){
- offset = (char *)region->addr - (char *)snapshot->regions[0]->start_addr;
- memset((char *)snapshot->regions[0]->data + offset, 0, region->size);
- }else if(region->addr > snapshot->regions[2]->start_addr && (char *)(region->addr) < (char*)snapshot->regions[2]->start_addr + snapshot->regions[2]->size){
- offset = (char *)region->addr - (char *)snapshot->regions[2]->start_addr;
- memset((char *)snapshot->regions[2]->data + offset, 0, region->size);
- }else if(region->addr > snapshot->regions[1]->start_addr && (char *)(region->addr) < (char*)snapshot->regions[1]->start_addr + snapshot->regions[1]->size){
- offset = (char *)region->addr - (char *)snapshot->regions[1]->start_addr;
- memset((char *)snapshot->regions[1]->data + offset, 0, region->size);
- }
+ 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;
-mc_snapshot_t MC_take_snapshot(int num_state){
+ // 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)
+{
+ mc_process_t mc_process = &mc_model_checker->process;
mc_snapshot_t snapshot = xbt_new0(s_mc_snapshot_t, 1);
- snapshot->nb_processes = xbt_swag_size(simix_global->process_list);
+ snapshot->process = mc_process;
+ 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(snapshot);
+ 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, snapshot->regions[0]->data);
- if(_sg_mc_hash && snapshot->stacks!=NULL) {
+ 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 {
+ } else {
snapshot->hash = 0;
}
- if(num_state > 0)
- MC_dump_checkpoint_ignore(snapshot);
-
+ MC_snapshot_ignore_restore(snapshot);
+ if (use_soft_dirty)
+ mc_model_checker->parent_snapshot = snapshot;
return snapshot;
-
}
-void MC_restore_snapshot(mc_snapshot_t snapshot){
- unsigned int i;
- for(i=0; i < NB_REGIONS; i++){
+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->regions[i])
- MC_region_restore(snapshot->regions[i]);
+ if (snapshot->snapshot_regions[i])
+ MC_region_restore(snapshot->snapshot_regions[i],
+ parent_snapshot ? parent_snapshot->snapshot_regions[i] : NULL);
}
- if(snapshot->privatization_regions) {
- for (i=0; i< SIMIX_process_count(); i++){
- if(snapshot->privatization_regions[i]) {
- MC_region_restore(snapshot->privatization_regions[i]);
- }
- }
- switch_data_segment(snapshot->privatization_index);
+#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
}
-void* mc_translate_address(uintptr_t addr, mc_snapshot_t snapshot) {
-
- // If not in a process state/clone:
- if(!snapshot) {
- return (uintptr_t*) addr;
- }
-
- // If it is in a snapshot:
- for(size_t i=0; i!=NB_REGIONS; ++i) {
- mc_mem_region_t region = snapshot->regions[i];
- uintptr_t start = (uintptr_t) region->start_addr;
- uintptr_t end = start + region->size;
+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.");
- // The address is in this region:
- if(addr >= start && addr < end) {
- uintptr_t offset = addr - start;
- return (void*) ((uintptr_t)region->data + offset);
+ 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);
}
-
- // It is not in a snapshot:
- return (void*) addr;
}
-uintptr_t mc_untranslate_address(void* addr, mc_snapshot_t snapshot) {
- if(!snapshot) {
- return (uintptr_t) addr;
+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();
}
-
- for(size_t i=0; i!=NB_REGIONS; ++i) {
- mc_mem_region_t region = snapshot->regions[i];
- if(addr>=region->data && addr<=(void*)(((char*)region->data)+region->size)) {
- size_t offset = (size_t) ((char*) addr - (char*) region->data);
- return ((uintptr_t) region->start_addr) + offset;
- }
+ MC_snapshot_ignore_restore(snapshot);
+ if (use_soft_dirty) {
+ mc_model_checker->parent_snapshot = snapshot;
}
- return (uintptr_t) addr;
+ mc_model_checker->process.cache_flags = 0;
}
-mc_snapshot_t SIMIX_pre_mc_snapshot(smx_simcall_t simcall){
+mc_snapshot_t simcall_HANDLER_mc_snapshot(smx_simcall_t simcall)
+{
return MC_take_snapshot(1);
}
-
-void *MC_snapshot(void){
- return simcall_mc_snapshot();
-}
