/************************************ Free functions **************************************/
/*****************************************************************************************/
-/** @brief Restore a region from a snapshot
- *
- * @param region Target region
- */
-static void restore(RegionSnapshot* region)
-{
- switch (region->storage_type()) {
- case simgrid::mc::StorageType::Flat:
- mc_model_checker->process().write_bytes(region->flat_data().get(), region->size(), region->permanent_address());
- break;
-
- case simgrid::mc::StorageType::Chunked:
- xbt_assert(((region->permanent_address().address()) & (xbt_pagesize - 1)) == 0, "Not at the beginning of a page");
- xbt_assert(simgrid::mc::mmu::chunk_count(region->size()) == region->page_data().page_count());
-
- for (size_t i = 0; i != region->page_data().page_count(); ++i) {
- void* target_page =
- (void*)simgrid::mc::mmu::join(i, (std::uintptr_t)(void*)region->permanent_address().address());
- const void* source_page = region->page_data().page(i);
- mc_model_checker->process().write_bytes(source_page, xbt_pagesize, remote(target_page));
- }
-
- break;
-
- case simgrid::mc::StorageType::Privatized:
- for (auto& p : region->privatized_data())
- restore(p.get());
- break;
-
- default: // includes StorageType::NoData
- xbt_die("Storage type not supported");
- break;
- }
-}
-
-static void get_memory_regions(simgrid::mc::RemoteClient* process, simgrid::mc::Snapshot* snapshot)
-{
- snapshot->snapshot_regions_.clear();
-
- for (auto const& object_info : process->object_infos)
- snapshot->add_region(simgrid::mc::RegionType::Data, object_info.get(), object_info->start_rw, object_info->start_rw,
- object_info->end_rw - object_info->start_rw);
- xbt_mheap_t heap = process->get_heap();
- void* start_heap = heap->base;
- void* end_heap = heap->breakval;
-
- snapshot->add_region(simgrid::mc::RegionType::Heap, nullptr, start_heap, start_heap,
- (char*)end_heap - (char*)start_heap);
- snapshot->heap_bytes_used_ = mmalloc_get_bytes_used_remote(heap->heaplimit, process->get_malloc_info());
- snapshot->privatization_index_ = simgrid::mc::ProcessIndexMissing;
-
-#if HAVE_SMPI
- if (mc_model_checker->process().privatized() && MC_smpi_process_count())
- // snapshot->privatization_index = smpi_loaded_page
- mc_model_checker->process().read_variable("smpi_loaded_page", &snapshot->privatization_index_,
- sizeof(snapshot->privatization_index_));
-#endif
-}
/** @brief Fills the position of the segments (executable, read-only, read/write).
* */
xbt_assert(result->start_exec || result->start_rw || result->start_ro);
}
-/************************************* 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 scope Scope description
- * @param ip Instruction pointer
- * @return true if the variable is valid
- * */
-static bool valid_variable(simgrid::mc::Variable* var, simgrid::mc::Frame* scope, const void* ip)
-{
- // The variable is not yet valid:
- if (scope->range.begin() + var->start_scope > (std::uint64_t)ip)
- return false;
- else
- return true;
-}
-
-static void fill_local_variables_values(mc_stack_frame_t stack_frame, simgrid::mc::Frame* scope, int process_index,
- std::vector<s_local_variable_t>& result)
-{
- if (not scope || not scope->range.contain(stack_frame->ip))
- return;
-
- for (simgrid::mc::Variable& current_variable : scope->variables) {
-
- if (not valid_variable(¤t_variable, scope, (void*)stack_frame->ip))
- continue;
-
- s_local_variable_t new_var;
- new_var.subprogram = stack_frame->frame;
- new_var.ip = stack_frame->ip;
- new_var.name = current_variable.name;
- new_var.type = current_variable.type;
- new_var.address = nullptr;
-
- if (current_variable.address != nullptr)
- new_var.address = current_variable.address;
- else if (not current_variable.location_list.empty()) {
- simgrid::dwarf::Location location = simgrid::dwarf::resolve(
- current_variable.location_list, current_variable.object_info, &(stack_frame->unw_cursor),
- (void*)stack_frame->frame_base, &mc_model_checker->process(), process_index);
-
- if (not location.in_memory())
- xbt_die("Cannot handle non-address variable");
- new_var.address = location.address();
-
- } else
- xbt_die("No address");
-
- result.push_back(std::move(new_var));
- }
-
- // Recursive processing of nested scopes:
- for (simgrid::mc::Frame& nested_scope : scope->scopes)
- fill_local_variables_values(stack_frame, &nested_scope, process_index, result);
-}
-
-static std::vector<s_local_variable_t> get_local_variables_values(std::vector<s_mc_stack_frame_t>& stack_frames,
- int process_index)
-{
- std::vector<s_local_variable_t> variables;
- for (s_mc_stack_frame_t& stack_frame : stack_frames)
- fill_local_variables_values(&stack_frame, stack_frame.frame, process_index, variables);
- return variables;
-}
-
-static std::vector<s_mc_stack_frame_t> unwind_stack_frames(simgrid::mc::UnwindContext* stack_context)
-{
- simgrid::mc::RemoteClient* process = &mc_model_checker->process();
- std::vector<s_mc_stack_frame_t> result;
-
- unw_cursor_t c = stack_context->cursor();
-
- // TODO, check condition check (unw_init_local==0 means end of frame)
-
- while (1) {
-
- s_mc_stack_frame_t stack_frame;
-
- stack_frame.unw_cursor = c;
-
- unw_word_t ip;
- unw_word_t 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
-
- simgrid::mc::Frame* frame = process->find_function(remote(ip));
- stack_frame.frame = frame;
-
- if (frame) {
- stack_frame.frame_name = frame->name;
- stack_frame.frame_base = (unw_word_t)frame->frame_base(c);
- } else {
- stack_frame.frame_base = 0;
- stack_frame.frame_name = std::string();
- }
-
- result.push_back(std::move(stack_frame));
-
- /* Stop before context switch with maestro */
- if (frame != nullptr && frame->name == "smx_ctx_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");
- }
-
- xbt_assert(not result.empty(), "unw_init_local failed");
-
- return result;
-}
-
-static void take_snapshot_stacks(simgrid::mc::Snapshot* snapshot)
-{
- for (auto const& stack : mc_model_checker->process().stack_areas()) {
- s_mc_snapshot_stack_t st;
-
- // Read the context from remote process:
- unw_context_t context;
- mc_model_checker->process().read_bytes(&context, sizeof(context), remote(stack.context));
-
- st.context.initialize(&mc_model_checker->process(), &context);
-
- st.stack_frames = unwind_stack_frames(&st.context);
- st.local_variables = get_local_variables_values(st.stack_frames, stack.process_index);
- st.process_index = stack.process_index;
-
- unw_word_t sp = st.stack_frames[0].sp;
-
- snapshot->stacks_.push_back(std::move(st));
-
- size_t stack_size = (char*)stack.address + stack.size - (char*)sp;
- snapshot->stack_sizes_.push_back(stack_size);
- }
-}
-
-static void snapshot_handle_ignore(simgrid::mc::Snapshot* snapshot)
-{
- xbt_assert(snapshot->process());
-
- // Copy the memory:
- for (auto const& region : mc_model_checker->process().ignored_regions()) {
- s_mc_snapshot_ignored_data_t ignored_data;
- ignored_data.start = (void*)region.addr;
- ignored_data.data.resize(region.size);
- // TODO, we should do this once per privatization segment:
- snapshot->process()->read_bytes(ignored_data.data.data(), region.size, remote(region.addr),
- simgrid::mc::ProcessIndexDisabled);
- snapshot->ignored_data_.push_back(std::move(ignored_data));
- }
-
- // Zero the memory:
- for (auto const& region : mc_model_checker->process().ignored_regions())
- snapshot->process()->clear_bytes(remote(region.addr), region.size);
-}
-
-static void snapshot_ignore_restore(simgrid::mc::Snapshot* snapshot)
-{
- for (auto const& ignored_data : snapshot->ignored_data_)
- snapshot->process()->write_bytes(ignored_data.data.data(), ignored_data.data.size(), remote(ignored_data.start));
-}
std::shared_ptr<simgrid::mc::Snapshot> take_snapshot(int num_state)
{
XBT_DEBUG("Taking snapshot %i", num_state);
- simgrid::mc::RemoteClient* mc_process = &mc_model_checker->process();
-
- std::shared_ptr<simgrid::mc::Snapshot> snapshot = std::make_shared<simgrid::mc::Snapshot>(mc_process, num_state);
-
- for (auto const& p : mc_model_checker->process().actors())
- snapshot->enabled_processes_.insert(p.copy.getBuffer()->get_pid());
-
- snapshot_handle_ignore(snapshot.get());
-
- /* Save the std heap and the writable mapped pages of libsimgrid and binary */
- get_memory_regions(mc_process, snapshot.get());
-
- snapshot->to_ignore_ = mc_model_checker->process().ignored_heap();
-
- if (_sg_mc_max_visited_states > 0 || not _sg_mc_property_file.get().empty()) {
- take_snapshot_stacks(snapshot.get());
- if (_sg_mc_hash)
- snapshot->hash_ = simgrid::mc::hash(*snapshot);
- }
-
- snapshot_ignore_restore(snapshot.get());
+ std::shared_ptr<simgrid::mc::Snapshot> snapshot = std::make_shared<simgrid::mc::Snapshot>(num_state);
return snapshot;
}
-static inline void restore_snapshot_regions(simgrid::mc::Snapshot* snapshot)
-{
- for (std::unique_ptr<simgrid::mc::RegionSnapshot> const& region : snapshot->snapshot_regions_) {
- // For privatized, variables we decided it was not necessary to take the snapshot:
- if (region)
- restore(region.get());
- }
-
-#if HAVE_SMPI
- if (snapshot->privatization_index_ >= 0) {
- // Fix the privatization mmap:
- s_mc_message_restore_t message{MC_MESSAGE_RESTORE, snapshot->privatization_index_};
- mc_model_checker->process().getChannel().send(message);
- }
-#endif
-}
-
-void restore_snapshot(std::shared_ptr<simgrid::mc::Snapshot> snapshot)
-{
- XBT_DEBUG("Restore snapshot %i", snapshot->num_state_);
- restore_snapshot_regions(snapshot.get());
- snapshot_ignore_restore(snapshot.get());
- mc_model_checker->process().clear_cache();
-}
-
} // namespace mc
} // namespace simgrid
