* under the terms of the license (GNU LGPL) which comes with this package. */
#include <cassert>
-
#include <cstdio>
+#include <list>
+
#include <xbt/log.h>
-#include <xbt/dynar.h>
-#include <xbt/dynar.hpp>
-#include <xbt/fifo.h>
#include <xbt/sysdep.h>
#include "src/mc/mc_state.h"
#include "src/mc/mc_exit.h"
#include "src/mc/Checker.hpp"
#include "src/mc/SafetyChecker.hpp"
+#include "src/mc/VisitedState.hpp"
#include "src/xbt/mmalloc/mmprivate.h"
XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_safety, mc,
"Logging specific to MC safety verification ");
-
namespace simgrid {
namespace mc {
-static int is_exploration_stack_state(mc_state_t current_state){
-
- xbt_fifo_item_t item;
- mc_state_t stack_state;
- for(item = xbt_fifo_get_first_item(mc_stack); item != nullptr; item = xbt_fifo_get_next_item(item)) {
- stack_state = (mc_state_t) xbt_fifo_get_item_content(item);
- if(snapshot_compare(stack_state, current_state) == 0){
- XBT_INFO("Non-progressive cycle : state %d -> state %d", stack_state->num, current_state->num);
- return 1;
- }
- }
- return 0;
+static void MC_show_non_termination(void)
+{
+ XBT_INFO("******************************************");
+ XBT_INFO("*** NON-PROGRESSIVE CYCLE DETECTED ***");
+ XBT_INFO("******************************************");
+ XBT_INFO("Counter-example execution trace:");
+ for (auto& s : mc_model_checker->getChecker()->getTextualTrace())
+ XBT_INFO("%s", s.c_str());
+ MC_print_statistics(mc_stats);
}
-/**
- * \brief Initialize the DPOR exploration algorithm
- */
-void SafetyChecker::pre()
+static int snapshot_compare(simgrid::mc::State* state1, simgrid::mc::State* state2)
{
- simgrid::mc::visited_states.clear();
-
- mc_state_t initial_state = MC_state_new();
+ simgrid::mc::Snapshot* s1 = state1->system_state.get();
+ simgrid::mc::Snapshot* s2 = state2->system_state.get();
+ int num1 = state1->num;
+ int num2 = state2->num;
+ return snapshot_compare(num1, s1, num2, s2);
+}
- XBT_DEBUG("**************************************************");
- XBT_DEBUG("Initial state");
+bool SafetyChecker::checkNonTermination(simgrid::mc::State* current_state)
+{
+ for (auto i = stack_.rbegin(); i != stack_.rend(); ++i)
+ if (snapshot_compare(i->get(), current_state) == 0){
+ XBT_INFO("Non-progressive cycle : state %d -> state %d",
+ (*i)->num, current_state->num);
+ return true;
+ }
+ return false;
+}
- /* Wait for requests (schedules processes) */
- mc_model_checker->wait_for_requests();
+RecordTrace SafetyChecker::getRecordTrace() // override
+{
+ RecordTrace res;
+ for (auto const& state : stack_) {
+ int value = 0;
+ smx_simcall_t saved_req = MC_state_get_executed_request(state.get(), &value);
+ const smx_process_t issuer = MC_smx_simcall_get_issuer(saved_req);
+ const int pid = issuer->pid;
+ res.push_back(RecordTraceElement(pid, value));
+ }
+ return res;
+}
- /* Get an enabled process and insert it in the interleave set of the initial state */
- for (auto& p : mc_model_checker->process().simix_processes())
- if (simgrid::mc::process_is_enabled(&p.copy)) {
- MC_state_interleave_process(initial_state, &p.copy);
- if (reductionMode_ != simgrid::mc::ReductionMode::none)
- break;
+std::vector<std::string> SafetyChecker::getTextualTrace() // override
+{
+ std::vector<std::string> trace;
+ for (auto const& state : stack_) {
+ int value;
+ smx_simcall_t req = MC_state_get_executed_request(state.get(), &value);
+ if (req) {
+ char* req_str = simgrid::mc::request_to_string(
+ req, value, simgrid::mc::RequestType::executed);
+ trace.push_back(req_str);
+ xbt_free(req_str);
}
-
- xbt_fifo_unshift(mc_stack, initial_state);
+ }
+ return trace;
}
int SafetyChecker::run()
{
this->init();
- char *req_str = nullptr;
int value;
smx_simcall_t req = nullptr;
- mc_state_t state = nullptr, prev_state = NULL, next_state = NULL;
- xbt_fifo_item_t item = nullptr;
- std::unique_ptr<simgrid::mc::VisitedState> visited_state = nullptr;
- while (xbt_fifo_size(mc_stack) > 0) {
+ while (!stack_.empty()) {
/* Get current state */
- state = (mc_state_t)xbt_fifo_get_item_content(xbt_fifo_get_first_item(mc_stack));
+ simgrid::mc::State* state = stack_.back().get();
XBT_DEBUG("**************************************************");
- XBT_DEBUG
- ("Exploration depth=%d (state=%p, num %d)(%u interleave, user_max_depth %d)",
- xbt_fifo_size(mc_stack), state, state->num,
- MC_state_interleave_size(state), user_max_depth_reached);
+ XBT_DEBUG(
+ "Exploration depth=%zi (state=%p, num %d)(%u interleave)",
+ stack_.size(), state, state->num,
+ MC_state_interleave_size(state));
/* Update statistics */
mc_stats->visited_states++;
/* If there are processes to interleave and the maximum depth has not been reached
then perform one step of the exploration algorithm */
- if (xbt_fifo_size(mc_stack) <= _sg_mc_max_depth && !user_max_depth_reached
- && (req = MC_state_get_request(state, &value)) && visited_state == nullptr) {
+ if (stack_.size() <= (std::size_t) _sg_mc_max_depth
+ && (req = MC_state_get_request(state, &value)) != nullptr
+ && visitedState_ == nullptr) {
- req_str = simgrid::mc::request_to_string(req, value, simgrid::mc::RequestType::simix);
+ char* req_str = simgrid::mc::request_to_string(req, value, simgrid::mc::RequestType::simix);
XBT_DEBUG("Execute: %s", req_str);
xbt_free(req_str);
mc_model_checker->wait_for_requests();
/* Create the new expanded state */
- next_state = MC_state_new();
+ std::unique_ptr<simgrid::mc::State> next_state =
+ std::unique_ptr<simgrid::mc::State>(MC_state_new());
- if(_sg_mc_termination && is_exploration_stack_state(next_state)){
+ if (_sg_mc_termination && this->checkNonTermination(next_state.get())) {
MC_show_non_termination();
return SIMGRID_MC_EXIT_NON_TERMINATION;
}
- if (_sg_mc_visited == 0 || (visited_state = simgrid::mc::is_visited_state(next_state, true)) == nullptr) {
+ if (_sg_mc_visited == 0
+ || (visitedState_ = visitedStates_.addVisitedState(next_state.get(), true)) == nullptr) {
/* Get an enabled process and insert it in the interleave set of the next state */
for (auto& p : mc_model_checker->process().simix_processes())
if (simgrid::mc::process_is_enabled(&p.copy)) {
- MC_state_interleave_process(next_state, &p.copy);
+ MC_state_interleave_process(next_state.get(), &p.copy);
if (reductionMode_ != simgrid::mc::ReductionMode::none)
break;
}
std::fprintf(dot_output, "\"%d\" -> \"%d\" [%s];\n", state->num, next_state->num, req_str);
} else if (dot_output != nullptr)
- std::fprintf(dot_output, "\"%d\" -> \"%d\" [%s];\n", state->num, visited_state->other_num == -1 ? visited_state->num : visited_state->other_num, req_str);
-
+ std::fprintf(dot_output, "\"%d\" -> \"%d\" [%s];\n", state->num, visitedState_->other_num == -1 ? visitedState_->num : visitedState_->other_num, req_str);
- xbt_fifo_unshift(mc_stack, next_state);
+ stack_.push_back(std::move(next_state));
if (dot_output != nullptr)
xbt_free(req_str);
/* The interleave set is empty or the maximum depth is reached, let's back-track */
} else {
- if ((xbt_fifo_size(mc_stack) > _sg_mc_max_depth) || user_max_depth_reached || visited_state != nullptr) {
-
- if (user_max_depth_reached && visited_state == nullptr)
- XBT_DEBUG("User max depth reached !");
- else if (visited_state == nullptr)
+ if (stack_.size() > (std::size_t) _sg_mc_max_depth
+ || visitedState_ != nullptr) {
+ if (visitedState_ == nullptr)
XBT_WARN("/!\\ Max depth reached ! /!\\ ");
else
- XBT_DEBUG("State already visited (equal to state %d), exploration stopped on this path.", visited_state->other_num == -1 ? visited_state->num : visited_state->other_num);
-
+ XBT_DEBUG("State already visited (equal to state %d),"
+ " exploration stopped on this path.",
+ visitedState_->other_num == -1 ? visitedState_->num : visitedState_->other_num);
} else
- XBT_DEBUG("There are no more processes to interleave. (depth %d)", xbt_fifo_size(mc_stack) + 1);
+ XBT_DEBUG("There are no more processes to interleave. (depth %zi)",
+ stack_.size() + 1);
/* Trash the current state, no longer needed */
- xbt_fifo_shift(mc_stack);
- XBT_DEBUG("Delete state %d at depth %d", state->num, xbt_fifo_size(mc_stack) + 1);
- MC_state_delete(state, !state->in_visited_states ? 1 : 0);
+ XBT_DEBUG("Delete state %d at depth %zi", state->num, stack_.size());
+ stack_.pop_back();
- visited_state = nullptr;
+ visitedState_ = nullptr;
/* Check for deadlocks */
if (mc_model_checker->checkDeadlock()) {
- MC_show_deadlock(nullptr);
+ MC_show_deadlock();
return SIMGRID_MC_EXIT_DEADLOCK;
}
executed before it. If it does then add it to the interleave set of the
state that executed that previous request. */
- while ((state = (mc_state_t) xbt_fifo_shift(mc_stack))) {
+ while (!stack_.empty()) {
+ std::unique_ptr<simgrid::mc::State> state = std::move(stack_.back());
+ stack_.pop_back();
if (reductionMode_ == simgrid::mc::ReductionMode::dpor) {
- req = MC_state_get_internal_request(state);
+ req = MC_state_get_internal_request(state.get());
if (req->call == SIMCALL_MUTEX_LOCK || req->call == SIMCALL_MUTEX_TRYLOCK)
xbt_die("Mutex is currently not supported with DPOR, "
"use --cfg=model-check/reduction:none");
const smx_process_t issuer = MC_smx_simcall_get_issuer(req);
- xbt_fifo_foreach(mc_stack, item, prev_state, mc_state_t) {
+ for (auto i = stack_.rbegin(); i != stack_.rend(); ++i) {
+ simgrid::mc::State* prev_state = i->get();
if (reductionMode_ != simgrid::mc::ReductionMode::none
&& simgrid::mc::request_depend(req, MC_state_get_internal_request(prev_state))) {
if (XBT_LOG_ISENABLED(mc_safety, xbt_log_priority_debug)) {
XBT_DEBUG("Dependent Transitions:");
smx_simcall_t prev_req = MC_state_get_executed_request(prev_state, &value);
- req_str = simgrid::mc::request_to_string(prev_req, value, simgrid::mc::RequestType::internal);
+ char* req_str = simgrid::mc::request_to_string(prev_req, value, simgrid::mc::RequestType::internal);
XBT_DEBUG("%s (state=%d)", req_str, prev_state->num);
xbt_free(req_str);
- prev_req = MC_state_get_executed_request(state, &value);
+ prev_req = MC_state_get_executed_request(state.get(), &value);
req_str = simgrid::mc::request_to_string(prev_req, value, simgrid::mc::RequestType::executed);
XBT_DEBUG("%s (state=%d)", req_str, state->num);
xbt_free(req_str);
}
}
- if (MC_state_interleave_size(state) && xbt_fifo_size(mc_stack) < _sg_mc_max_depth) {
+ if (MC_state_interleave_size(state.get())
+ && stack_.size() < (std::size_t) _sg_mc_max_depth) {
/* We found a back-tracking point, let's loop */
- XBT_DEBUG("Back-tracking to state %d at depth %d", state->num, xbt_fifo_size(mc_stack) + 1);
- xbt_fifo_unshift(mc_stack, state);
- MC_replay(mc_stack);
- XBT_DEBUG("Back-tracking to state %d at depth %d done", state->num, xbt_fifo_size(mc_stack));
+ XBT_DEBUG("Back-tracking to state %d at depth %zi",
+ state->num, stack_.size() + 1);
+ stack_.push_back(std::move(state));
+ simgrid::mc::replay(stack_);
+ XBT_DEBUG("Back-tracking to state %d at depth %zi done",
+ stack_.back()->num, stack_.size());
break;
} else {
- XBT_DEBUG("Delete state %d at depth %d", state->num, xbt_fifo_size(mc_stack) + 1);
- MC_state_delete(state, !state->in_visited_states ? 1 : 0);
+ XBT_DEBUG("Delete state %d at depth %zi",
+ state->num, stack_.size() + 1);
}
}
}
XBT_INFO("No property violation found.");
MC_print_statistics(mc_stats);
+ initial_global_state = nullptr;
return SIMGRID_MC_EXIT_SUCCESS;
}
XBT_DEBUG("Starting the safety algorithm");
- /* Create exploration stack */
- mc_stack = xbt_fifo_new();
+ std::unique_ptr<simgrid::mc::State> initial_state =
+ std::unique_ptr<simgrid::mc::State>(MC_state_new());
+
+ XBT_DEBUG("**************************************************");
+ XBT_DEBUG("Initial state");
+
+ /* Wait for requests (schedules processes) */
+ mc_model_checker->wait_for_requests();
+
+ /* Get an enabled process and insert it in the interleave set of the initial state */
+ for (auto& p : mc_model_checker->process().simix_processes())
+ if (simgrid::mc::process_is_enabled(&p.copy)) {
+ MC_state_interleave_process(initial_state.get(), &p.copy);
+ if (reductionMode_ != simgrid::mc::ReductionMode::none)
+ break;
+ }
- this->pre();
+ stack_.push_back(std::move(initial_state));
/* Save the initial state */
- initial_global_state = xbt_new0(s_mc_global_t, 1);
+ initial_global_state = std::unique_ptr<s_mc_global_t>(new s_mc_global_t());
initial_global_state->snapshot = simgrid::mc::take_snapshot(0);
}
SafetyChecker::~SafetyChecker()
{
}
+
+Checker* createSafetyChecker(Session& session)
+{
+ return new SafetyChecker(session);
+}
}
}
