src/mc/explo/DFSExplorer.hpp

   1 /* Copyright (c) 2008-2023. The SimGrid Team. All rights reserved.          */
   2
   3 /* This program is free software; you can redistribute it and/or modify it
   4  * under the terms of the license (GNU LGPL) which comes with this package. */
   5
   6 #ifndef SIMGRID_MC_SAFETY_CHECKER_HPP
   7 #define SIMGRID_MC_SAFETY_CHECKER_HPP
   8
   9 #include "src/mc/api/ClockVector.hpp"
  10 #include "src/mc/api/State.hpp"
  11 #include "src/mc/explo/Exploration.hpp"
  12 #include "src/mc/explo/odpor/Execution.hpp"
  13 #include "src/mc/mc_config.hpp"
  14
  15 #include <deque>
  16 #include <list>
  17 #include <memory>
  18 #include <set>
  19 #include <string>
  20 #include <unordered_map>
  21 #include <vector>
  22
  23 namespace simgrid::mc {
  24
  25 using stack_t = std::deque<std::shared_ptr<State>>;
  26
  27 class XBT_PRIVATE DFSExplorer : public Exploration {
  28 private:
  29   ReductionMode reduction_mode_;
  30   unsigned long backtrack_count_      = 0; // for statistics
  31   unsigned long visited_states_count_ = 0; // for statistics
  32
  33   static xbt::signal<void(RemoteApp&)> on_exploration_start_signal;
  34   static xbt::signal<void(RemoteApp&)> on_backtracking_signal;
  35
  36   static xbt::signal<void(State*, RemoteApp&)> on_state_creation_signal;
  37
  38   static xbt::signal<void(State*, RemoteApp&)> on_restore_system_state_signal;
  39   static xbt::signal<void(RemoteApp&)> on_restore_initial_state_signal;
  40   static xbt::signal<void(Transition*, RemoteApp&)> on_transition_replay_signal;
  41   static xbt::signal<void(Transition*, RemoteApp&)> on_transition_execute_signal;
  42
  43   static xbt::signal<void(RemoteApp&)> on_log_state_signal;
  44
  45 public:
  46   explicit DFSExplorer(const std::vector<char*>& args, ReductionMode mode);
  47   void run() override;
  48   RecordTrace get_record_trace() override;
  49   void log_state() override;
  50
  51   /** Called once when the exploration starts */
  52   static void on_exploration_start(std::function<void(RemoteApp& remote_app)> const& f)
  53   {
  54     on_exploration_start_signal.connect(f);
  55   }
  56   /** Called each time that the exploration backtracks from a exploration end */
  57   static void on_backtracking(std::function<void(RemoteApp& remote_app)> const& f)
  58   {
  59     on_backtracking_signal.connect(f);
  60   }
  61   /** Called each time that a new state is create */
  62   static void on_state_creation(std::function<void(State*, RemoteApp& remote_app)> const& f)
  63   {
  64     on_state_creation_signal.connect(f);
  65   }
  66   /** Called when rollbacking directly onto a previously checkpointed state */
  67   static void on_restore_system_state(std::function<void(State*, RemoteApp& remote_app)> const& f)
  68   {
  69     on_restore_system_state_signal.connect(f);
  70   }
  71   /** Called when the state to which we backtrack was not checkpointed state, forcing us to restore the initial state
  72    * before replaying some transitions */
  73   static void on_restore_initial_state(std::function<void(RemoteApp& remote_app)> const& f)
  74   {
  75     on_restore_initial_state_signal.connect(f);
  76   }
  77   /** Called when replaying a transition that was previously executed, to reach a backtracked state */
  78   static void on_transition_replay(std::function<void(Transition*, RemoteApp& remote_app)> const& f)
  79   {
  80     on_transition_replay_signal.connect(f);
  81   }
  82   /** Called when executing a new transition */
  83   static void on_transition_execute(std::function<void(Transition*, RemoteApp& remote_app)> const& f)
  84   {
  85     on_transition_execute_signal.connect(f);
  86   }
  87   /** Called when displaying the statistics at the end of the exploration */
  88   static void on_log_state(std::function<void(RemoteApp&)> const& f) { on_log_state_signal.connect(f); }
  89
  90 private:
  91   void backtrack();
  92
  93   /** Stack representing the position in the exploration graph */
  94   stack_t stack_;
  95
  96   /**
  97    * Provides additional metadata about the position in the exploration graph
  98    * which is used by SDPOR and ODPOR
  99    */
 100   odpor::Execution execution_seq_;
 101
 102   /** Per-actor clock vectors used to compute the "happens-before" relation */
 103   std::unordered_map<aid_t, ClockVector> per_actor_clocks_;
 104
 105   /** Opened states are states that still contains todo actors.
 106    *  When backtracking, we pick a state from it*/
 107   std::vector<std::shared_ptr<State>> opened_states_;
 108   std::shared_ptr<State> best_opened_state();
 109
 110   /** If we're running ODPOR, picks the corresponding state in the stack
 111    * (opened_states_ are ignored)
 112    */
 113   std::shared_ptr<State> next_odpor_state();
 114
 115   /** Change current stack_ value to correspond to the one we would have
 116    *  had if we executed transition to get to state. This is required when
 117    *  backtracking, and achieved thanks to the fact states save their parent.*/
 118   void restore_stack(std::shared_ptr<State> state);
 119
 120   RecordTrace get_record_trace_of_stack(stack_t stack);
 121 };
 122
 123 } // namespace simgrid::mc
 124
 125 #endif