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| Rev | Author | Line No. | Line |
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| 96 | pmbaty | 1 | /* |
| 2 | Stockfish, a UCI chess playing engine derived from Glaurung 2.1 |
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| 3 | Copyright (C) 2004-2008 Tord Romstad (Glaurung author) |
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| 4 | Copyright (C) 2008-2015 Marco Costalba, Joona Kiiski, Tord Romstad |
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| 5 | Copyright (C) 2015-2016 Marco Costalba, Joona Kiiski, Gary Linscott, Tord Romstad |
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| 6 | |||
| 7 | Stockfish is free software: you can redistribute it and/or modify |
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| 8 | it under the terms of the GNU General Public License as published by |
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| 9 | the Free Software Foundation, either version 3 of the License, or |
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| 10 | (at your option) any later version. |
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| 11 | |||
| 12 | Stockfish is distributed in the hope that it will be useful, |
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| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 15 | GNU General Public License for more details. |
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| 16 | |||
| 17 | You should have received a copy of the GNU General Public License |
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| 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. |
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| 19 | */ |
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| 20 | |||
| 21 | #ifndef SEARCH_H_INCLUDED |
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| 22 | #define SEARCH_H_INCLUDED |
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| 23 | |||
| 24 | #include <atomic> |
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| 25 | #include <vector> |
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| 26 | |||
| 27 | #include "misc.h" |
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| 154 | pmbaty | 28 | #include "movepick.h" |
| 96 | pmbaty | 29 | #include "types.h" |
| 30 | |||
| 154 | pmbaty | 31 | class Position; |
| 32 | |||
| 96 | pmbaty | 33 | namespace Search { |
| 34 | |||
| 35 | /// Stack struct keeps track of the information we need to remember from nodes |
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| 36 | /// shallower and deeper in the tree during the search. Each search thread has |
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| 37 | /// its own array of Stack objects, indexed by the current ply. |
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| 38 | |||
| 39 | struct Stack { |
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| 40 | Move* pv; |
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| 41 | int ply; |
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| 42 | Move currentMove; |
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| 43 | Move excludedMove; |
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| 44 | Move killers[2]; |
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| 45 | Value staticEval; |
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| 154 | pmbaty | 46 | Value history; |
| 96 | pmbaty | 47 | bool skipEarlyPruning; |
| 48 | int moveCount; |
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| 154 | pmbaty | 49 | CounterMoveStats* counterMoves; |
| 96 | pmbaty | 50 | }; |
| 51 | |||
| 154 | pmbaty | 52 | |
| 96 | pmbaty | 53 | /// RootMove struct is used for moves at the root of the tree. For each root move |
| 54 | /// we store a score and a PV (really a refutation in the case of moves which |
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| 55 | /// fail low). Score is normally set at -VALUE_INFINITE for all non-pv moves. |
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| 56 | |||
| 57 | struct RootMove { |
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| 58 | |||
| 59 | explicit RootMove(Move m) : pv(1, m) {} |
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| 60 | |||
| 61 | bool operator<(const RootMove& m) const { return m.score < score; } // Descending sort |
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| 62 | bool operator==(const Move& m) const { return pv[0] == m; } |
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| 63 | bool extract_ponder_from_tt(Position& pos); |
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| 64 | |||
| 65 | Value score = -VALUE_INFINITE; |
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| 66 | Value previousScore = -VALUE_INFINITE; |
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| 67 | std::vector<Move> pv; |
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| 68 | }; |
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| 69 | |||
| 154 | pmbaty | 70 | typedef std::vector<RootMove> RootMoves; |
| 96 | pmbaty | 71 | |
| 154 | pmbaty | 72 | |
| 96 | pmbaty | 73 | /// LimitsType struct stores information sent by GUI about available time to |
| 74 | /// search the current move, maximum depth/time, if we are in analysis mode or |
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| 75 | /// if we have to ponder while it's our opponent's turn to move. |
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| 76 | |||
| 77 | struct LimitsType { |
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| 78 | |||
| 79 | LimitsType() { // Init explicitly due to broken value-initialization of non POD in MSVC |
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| 154 | pmbaty | 80 | nodes = time[WHITE] = time[BLACK] = inc[WHITE] = inc[BLACK] = |
| 81 | npmsec = movestogo = depth = movetime = mate = infinite = ponder = 0; |
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| 96 | pmbaty | 82 | } |
| 83 | |||
| 84 | bool use_time_management() const { |
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| 85 | return !(mate | movetime | depth | nodes | infinite); |
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| 86 | } |
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| 87 | |||
| 88 | std::vector<Move> searchmoves; |
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| 89 | int time[COLOR_NB], inc[COLOR_NB], npmsec, movestogo, depth, movetime, mate, infinite, ponder; |
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| 90 | int64_t nodes; |
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| 91 | TimePoint startTime; |
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| 92 | }; |
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| 93 | |||
| 94 | |||
| 154 | pmbaty | 95 | /// SignalsType struct stores atomic flags updated during the search, typically |
| 96 | /// in an async fashion e.g. to stop the search by the GUI. |
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| 97 | |||
| 96 | pmbaty | 98 | struct SignalsType { |
| 99 | std::atomic_bool stop, stopOnPonderhit; |
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| 100 | }; |
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| 101 | |||
| 102 | extern SignalsType Signals; |
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| 103 | extern LimitsType Limits; |
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| 104 | |||
| 105 | void init(); |
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| 106 | void clear(); |
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| 107 | template<bool Root = true> uint64_t perft(Position& pos, Depth depth); |
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| 108 | |||
| 109 | } // namespace Search |
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| 110 | |||
| 111 | #endif // #ifndef SEARCH_H_INCLUDED |