#include <unistd.h>
#include <sys/wait.h>
+#include <memory>
+#include <algorithm>
+
#include <xbt/automaton.h>
#include <xbt/log.h>
#include <xbt/sysdep.h>
#include <xbt/dynar.h>
+#include <xbt/dynar.hpp>
#include <xbt/fifo.h>
#include "src/mc/mc_comm_pattern.h"
namespace simgrid {
namespace mc {
-xbt_dynar_t visited_pairs;
-xbt_dynar_t visited_states;
+std::vector<std::unique_ptr<simgrid::mc::VisitedState>> visited_states;
static int is_exploration_stack_state(simgrid::mc::VisitedState* state){
xbt_fifo_item_t item = xbt_fifo_get_first_item(mc_stack);
this->nb_processes =
mc_model_checker->process().simix_processes().size();
+ this->system_state = simgrid::mc::take_snapshot(mc_stats->expanded_states);
this->num = mc_stats->expanded_states;
this->other_num = -1;
}
}
}
-/**
- * \brief Find a suitable subrange of candidate duplicates for a given state
- * \param list dynamic array of states/pairs with candidate duplicates of the current state;
- * \param ref current state/pair;
- * \param min (output) index of the beginning of the the subrange
- * \param max (output) index of the enf of the subrange
- *
- * Given a suitably ordered array of states/pairs, this function extracts a subrange
- * (with index *min <= i <= *max) with candidate duplicates of the given state/pair.
- * This function uses only fast discriminating criterions and does not use the
- * full state/pair comparison algorithms.
- *
- * The states/pairs in list MUST be ordered using a (given) weak order
- * (based on nb_processes and heap_bytes_used).
- * The subrange is the subrange of "equivalence" of the given state/pair.
- */
-int get_search_interval(xbt_dynar_t list, void *ref, int *min, int *max)
-{
- int cursor = 0, previous_cursor;
- int nb_processes, heap_bytes_used, nb_processes_test, heap_bytes_used_test;
- void *ref_test;
-
- if (_sg_mc_liveness) {
- nb_processes = ((simgrid::mc::VisitedPair*) ref)->nb_processes;
- heap_bytes_used = ((simgrid::mc::VisitedPair*) ref)->heap_bytes_used;
- } else {
- nb_processes = ((simgrid::mc::VisitedState*) ref)->nb_processes;
- heap_bytes_used = ((simgrid::mc::VisitedState*) ref)->heap_bytes_used;
- }
-
- int start = 0;
- int end = xbt_dynar_length(list) - 1;
-
- while (start <= end) {
- cursor = (start + end) / 2;
- if (_sg_mc_liveness) {
- ref_test = (simgrid::mc::VisitedPair*) xbt_dynar_get_as(list, cursor, simgrid::mc::VisitedPair*);
- nb_processes_test = ((simgrid::mc::VisitedPair*) ref_test)->nb_processes;
- heap_bytes_used_test = ((simgrid::mc::VisitedPair*) ref_test)->heap_bytes_used;
- } else {
- ref_test = (simgrid::mc::VisitedState*) xbt_dynar_get_as(list, cursor, simgrid::mc::VisitedState*);
- nb_processes_test = ((simgrid::mc::VisitedState*) ref_test)->nb_processes;
- heap_bytes_used_test = ((simgrid::mc::VisitedState*) ref_test)->heap_bytes_used;
- }
- if (nb_processes_test < nb_processes)
- start = cursor + 1;
- else if (nb_processes_test > nb_processes)
- end = cursor - 1;
- else if (heap_bytes_used_test < heap_bytes_used)
- start = cursor + 1;
- else if (heap_bytes_used_test > heap_bytes_used)
- end = cursor - 1;
- else {
- *min = *max = cursor;
- previous_cursor = cursor - 1;
- while (previous_cursor >= 0) {
- if (_sg_mc_liveness) {
- ref_test = (simgrid::mc::VisitedPair*) xbt_dynar_get_as(list, previous_cursor, simgrid::mc::VisitedPair*);
- nb_processes_test = ((simgrid::mc::VisitedPair*) ref_test)->nb_processes;
- heap_bytes_used_test = ((simgrid::mc::VisitedPair*) ref_test)->heap_bytes_used;
- } else {
- ref_test = (simgrid::mc::VisitedState*) xbt_dynar_get_as(list, previous_cursor, simgrid::mc::VisitedState*);
- nb_processes_test = ((simgrid::mc::VisitedState*) ref_test)->nb_processes;
- heap_bytes_used_test = ((simgrid::mc::VisitedState*) ref_test)->heap_bytes_used;
- }
- if (nb_processes_test != nb_processes || heap_bytes_used_test != heap_bytes_used)
- break;
- *min = previous_cursor;
- previous_cursor--;
- }
- size_t next_cursor = cursor + 1;
- while (next_cursor < xbt_dynar_length(list)) {
- if (_sg_mc_liveness) {
- ref_test = (simgrid::mc::VisitedPair*) xbt_dynar_get_as(list, next_cursor, simgrid::mc::VisitedPair*);
- nb_processes_test = ((simgrid::mc::VisitedPair*) ref_test)->nb_processes;
- heap_bytes_used_test = ((simgrid::mc::VisitedPair*) ref_test)->heap_bytes_used;
- } else {
- ref_test = (simgrid::mc::VisitedState*) xbt_dynar_get_as(list, next_cursor, simgrid::mc::VisitedState*);
- nb_processes_test = ((simgrid::mc::VisitedState*) ref_test)->nb_processes;
- heap_bytes_used_test = ((simgrid::mc::VisitedState*) ref_test)->heap_bytes_used;
- }
- if (nb_processes_test != nb_processes || heap_bytes_used_test != heap_bytes_used)
- break;
- *max = next_cursor;
- next_cursor++;
- }
- return -1;
- }
- }
- return cursor;
-}
-
-static
-void replace_state(
- simgrid::mc::VisitedState* state_test, simgrid::mc::VisitedState* new_state, int cursor)
-{
- if (state_test->other_num == -1)
- new_state->other_num = state_test->num;
- else
- new_state->other_num = state_test->other_num;
-
- if (dot_output == nullptr)
- XBT_DEBUG("State %d already visited ! (equal to state %d)",
- new_state->num, state_test->num);
- else
- XBT_DEBUG(
- "State %d already visited ! (equal to state %d (state %d in dot_output))",
- new_state->num, state_test->num, new_state->other_num);
-
- /* Replace the old state with the new one (with a bigger num)
- (when the max number of visited states is reached, the oldest
- one is removed according to its number (= with the min number) */
- xbt_dynar_remove_at(simgrid::mc::visited_states, cursor, nullptr);
- xbt_dynar_insert_at(simgrid::mc::visited_states, cursor, &new_state);
- XBT_DEBUG("Replace visited state %d with the new visited state %d",
- state_test->num, new_state->num);
-}
-
static
bool some_communications_are_not_finished()
{
namespace simgrid {
namespace mc {
+static void prune_visited_states()
+{
+ while (visited_states.size() > (std::size_t) _sg_mc_visited) {
+ XBT_DEBUG("Try to remove visited state (maximum number of stored states reached)");
+ auto min_element = std::min_element(visited_states.begin(), visited_states.end(),
+ [](std::unique_ptr<simgrid::mc::VisitedState>& a, std::unique_ptr<simgrid::mc::VisitedState>& b) {
+ return a->num < b->num;
+ });
+ xbt_assert(min_element != visited_states.end());
+ // and drop it:
+ visited_states.erase(min_element);
+ XBT_DEBUG("Remove visited state (maximum number of stored states reached)");
+ }
+}
+
/**
* \brief Checks whether a given state has already been visited by the algorithm.
*/
-simgrid::mc::VisitedState* is_visited_state(mc_state_t graph_state)
+std::unique_ptr<simgrid::mc::VisitedState> is_visited_state(mc_state_t graph_state)
{
if (_sg_mc_visited == 0)
return nullptr;
int partial_comm = (_sg_mc_comms_determinism || _sg_mc_send_determinism) &&
some_communications_are_not_finished();
- simgrid::mc::VisitedState* new_state = new VisitedState();
+ std::unique_ptr<simgrid::mc::VisitedState> new_state =
+ std::unique_ptr<simgrid::mc::VisitedState>(new VisitedState());
graph_state->system_state = new_state->system_state;
graph_state->in_visited_states = 1;
XBT_DEBUG("Snapshot %p of visited state %d (exploration stack state %d)", new_state->system_state, new_state->num, graph_state->num);
- if (xbt_dynar_is_empty(visited_states)) {
- xbt_dynar_push(visited_states, &new_state);
- return nullptr;
- }
-
- int min = -1, max = -1, index;
-
- index = get_search_interval(visited_states, new_state, &min, &max);
-
- if (min != -1 && max != -1) {
+ auto range = std::equal_range(visited_states.begin(), visited_states.end(),
+ new_state.get(), simgrid::mc::DerefAndCompareByNbProcessesAndUsedHeap());
if (_sg_mc_safety || (!partial_comm
&& initial_global_state->initial_communications_pattern_done)) {
- int cursor = min;
- while (cursor <= max) {
- simgrid::mc::VisitedState* state_test = (simgrid::mc::VisitedState*) xbt_dynar_get_as(visited_states, cursor, simgrid::mc::VisitedState*);
- if (snapshot_compare(state_test, new_state) == 0) {
+ for (auto i = range.first; i != range.second; ++i) {
+ auto& visited_state = *i;
+ if (snapshot_compare(visited_state.get(), new_state.get()) == 0) {
// The state has been visited:
- replace_state(state_test, new_state, cursor);
- return state_test;
+ std::unique_ptr<simgrid::mc::VisitedState> old_state =
+ std::move(visited_state);
+
+ if (old_state->other_num == -1)
+ new_state->other_num = old_state->num;
+ else
+ new_state->other_num = old_state->other_num;
+
+ if (dot_output == nullptr)
+ XBT_DEBUG("State %d already visited ! (equal to state %d)",
+ new_state->num, old_state->num);
+ else
+ XBT_DEBUG(
+ "State %d already visited ! (equal to state %d (state %d in dot_output))",
+ new_state->num, old_state->num, new_state->other_num);
+
+ /* Replace the old state with the new one (with a bigger num)
+ (when the max number of visited states is reached, the oldest
+ one is removed according to its number (= with the min number) */
+ XBT_DEBUG("Replace visited state %d with the new visited state %d",
+ old_state->num, new_state->num);
+
+ visited_state = std::move(new_state);
+ return std::move(old_state);
}
- cursor++;
}
}
-
- xbt_dynar_insert_at(visited_states, min, &new_state);
- XBT_DEBUG("Insert new visited state %d (total : %lu)", new_state->num, xbt_dynar_length(visited_states));
-
- } else {
-
- // The state has not been visited: insert the state in the dynamic array.
- simgrid::mc::VisitedState* state_test = (simgrid::mc::VisitedState*) xbt_dynar_get_as(visited_states, index, simgrid::mc::VisitedState*);
- if (state_test->nb_processes < new_state->nb_processes)
- xbt_dynar_insert_at(visited_states, index + 1, &new_state);
- else if (state_test->heap_bytes_used < new_state->heap_bytes_used)
- xbt_dynar_insert_at(visited_states, index + 1, &new_state);
- else
- xbt_dynar_insert_at(visited_states, index, &new_state);
-
- XBT_DEBUG("Insert new visited state %d (total : %lu)", new_state->num, xbt_dynar_length(visited_states));
- }
-
- if ((ssize_t) xbt_dynar_length(visited_states) <= _sg_mc_visited)
- return nullptr;
-
- // We have reached the maximum number of stored states;
-
- XBT_DEBUG("Try to remove visited state (maximum number of stored states reached)");
-
- // Find the (index of the) older state (with the smallest num):
- int min2 = mc_stats->expanded_states;
- unsigned int cursor2 = 0;
- unsigned int index2 = 0;
-
- simgrid::mc::VisitedState* state_test;
- xbt_dynar_foreach(visited_states, cursor2, state_test)
- if (!mc_model_checker->is_important_snapshot(*state_test->system_state)
- && state_test->num < min2) {
- index2 = cursor2;
- min2 = state_test->num;
- }
-
- // and drop it:
- xbt_dynar_remove_at(visited_states, index2, nullptr);
- XBT_DEBUG("Remove visited state (maximum number of stored states reached)");
-
- return nullptr;
-}
-
-/**
- * \brief Checks whether a given pair has already been visited by the algorithm.
- */
-int is_visited_pair(simgrid::mc::VisitedPair* visited_pair, simgrid::mc::Pair* pair) {
-
- if (_sg_mc_visited == 0)
- return -1;
-
- simgrid::mc::VisitedPair* new_visited_pair = nullptr;
- if (visited_pair == nullptr)
- new_visited_pair = new simgrid::mc::VisitedPair(
- pair->num, pair->automaton_state, pair->atomic_propositions.get(),
- pair->graph_state);
- else
- new_visited_pair = visited_pair;
-
- if (xbt_dynar_is_empty(visited_pairs)) {
- xbt_dynar_push(visited_pairs, &new_visited_pair);
- return -1;
- }
-
- int min = -1, max = -1, index;
- //int res;
- simgrid::mc::VisitedPair* pair_test;
- int cursor;
-
- index = get_search_interval(visited_pairs, new_visited_pair, &min, &max);
-
- if (min != -1 && max != -1) { // Visited pair with same number of processes and same heap bytes used exists
- cursor = min;
- while (cursor <= max) {
- pair_test = (simgrid::mc::VisitedPair*) xbt_dynar_get_as(visited_pairs, cursor, simgrid::mc::VisitedPair*);
- if (xbt_automaton_state_compare(pair_test->automaton_state, new_visited_pair->automaton_state) == 0) {
- if (xbt_automaton_propositional_symbols_compare_value(
- pair_test->atomic_propositions.get(),
- new_visited_pair->atomic_propositions.get()) == 0) {
- if (snapshot_compare(pair_test, new_visited_pair) == 0) {
- if (pair_test->other_num == -1)
- new_visited_pair->other_num = pair_test->num;
- else
- new_visited_pair->other_num = pair_test->other_num;
- if (dot_output == nullptr)
- XBT_DEBUG("Pair %d already visited ! (equal to pair %d)", new_visited_pair->num, pair_test->num);
- else
- XBT_DEBUG("Pair %d already visited ! (equal to pair %d (pair %d in dot_output))", new_visited_pair->num, pair_test->num, new_visited_pair->other_num);
- xbt_dynar_remove_at(visited_pairs, cursor, &pair_test);
- xbt_dynar_insert_at(visited_pairs, cursor, &new_visited_pair);
- pair_test->visited_removed = 1;
- if (!pair_test->acceptance_pair
- || pair_test->acceptance_removed == 1)
- delete pair_test;
- return new_visited_pair->other_num;
- }
- }
- }
- cursor++;
- }
- xbt_dynar_insert_at(visited_pairs, min, &new_visited_pair);
- } else {
- pair_test = (simgrid::mc::VisitedPair*) xbt_dynar_get_as(visited_pairs, index, simgrid::mc::VisitedPair*);
- if (pair_test->nb_processes < new_visited_pair->nb_processes)
- xbt_dynar_insert_at(visited_pairs, index + 1, &new_visited_pair);
- else if (pair_test->heap_bytes_used < new_visited_pair->heap_bytes_used)
- xbt_dynar_insert_at(visited_pairs, index + 1, &new_visited_pair);
- else
- xbt_dynar_insert_at(visited_pairs, index, &new_visited_pair);
- }
-
- if ((ssize_t) xbt_dynar_length(visited_pairs) > _sg_mc_visited) {
- int min2 = mc_stats->expanded_pairs;
- unsigned int cursor2 = 0;
- unsigned int index2 = 0;
- xbt_dynar_foreach(visited_pairs, cursor2, pair_test) {
- if (!mc_model_checker->is_important_snapshot(*pair_test->graph_state->system_state)
- && pair_test->num < min2) {
- index2 = cursor2;
- min2 = pair_test->num;
- }
- }
- xbt_dynar_remove_at(visited_pairs, index2, &pair_test);
- pair_test->visited_removed = 1;
- if (!pair_test->acceptance_pair || pair_test->acceptance_removed)
- delete pair_test;
- }
- return -1;
+ XBT_DEBUG("Insert new visited state %d (total : %lu)", new_state->num, (unsigned long) visited_states.size());
+ visited_states.insert(range.first, std::move(new_state));
+ prune_visited_states();
+ return nullptr;
}
}
