/*
Stockfish, a UCI chess playing engine derived from Glaurung 2.1
Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
- Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
+ Copyright (C) 2008-2015 Marco Costalba, Joona Kiiski, Tord Romstad
+ Copyright (C) 2015-2016 Marco Costalba, Joona Kiiski, Gary Linscott, Tord Romstad
Stockfish is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
-#if !defined(SEARCH_H_INCLUDED)
+#ifndef SEARCH_H_INCLUDED
#define SEARCH_H_INCLUDED
-#include <cstring>
+#include <atomic>
+#include <vector>
-#include "move.h"
+#include "misc.h"
+#include "position.h"
#include "types.h"
-class Position;
-struct SplitPoint;
+template<typename T, bool CM> struct Stats;
+typedef Stats<Value, true> CounterMoveStats;
-/// The SearchStack struct keeps track of the information we need to remember
-/// from nodes shallower and deeper in the tree during the search. Each
-/// search thread has its own array of SearchStack objects, indexed by the
-/// current ply.
+namespace Search {
-struct SearchStack {
+/// Stack struct keeps track of the information we need to remember from nodes
+/// shallower and deeper in the tree during the search. Each search thread has
+/// its own array of Stack objects, indexed by the current ply.
+
+struct Stack {
+ Move* pv;
int ply;
Move currentMove;
Move excludedMove;
- Move bestMove;
Move killers[2];
- Depth reduction;
- Value eval;
- Value evalMargin;
- bool skipNullMove;
- SplitPoint* sp;
+ Value staticEval;
+ bool skipEarlyPruning;
+ int moveCount;
+ CounterMoveStats* counterMoves;
};
+/// RootMove struct is used for moves at the root of the tree. For each root move
+/// we store a score and a PV (really a refutation in the case of moves which
+/// fail low). Score is normally set at -VALUE_INFINITE for all non-pv moves.
+
+struct RootMove {
+
+ explicit RootMove(Move m) : pv(1, m) {}
+
+ bool operator<(const RootMove& m) const { return m.score < score; } // Descending sort
+ bool operator==(const Move& m) const { return pv[0] == m; }
+ void insert_pv_in_tt(Position& pos);
+ bool extract_ponder_from_tt(Position& pos);
+
+ Value score = -VALUE_INFINITE;
+ Value previousScore = -VALUE_INFINITE;
+ std::vector<Move> pv;
+};
-/// The SearchLimits struct stores information sent by GUI about available time
-/// to search the current move, maximum depth/time, if we are in analysis mode
-/// or if we have to ponder while is our opponent's side to move.
+typedef std::vector<RootMove> RootMoves;
-struct SearchLimits {
+/// LimitsType struct stores information sent by GUI about available time to
+/// search the current move, maximum depth/time, if we are in analysis mode or
+/// if we have to ponder while it's our opponent's turn to move.
- SearchLimits() { memset(this, 0, sizeof(SearchLimits)); }
+struct LimitsType {
- SearchLimits(int t, int i, int mtg, int mt, int md, int mn, bool inf, bool pon)
- : time(t), increment(i), movesToGo(mtg), maxTime(mt), maxDepth(md),
- maxNodes(mn), infinite(inf), ponder(pon) {}
+ LimitsType() { // Init explicitly due to broken value-initialization of non POD in MSVC
+ nodes = time[WHITE] = time[BLACK] = inc[WHITE] = inc[BLACK] =
+ npmsec = movestogo = depth = movetime = mate = infinite = ponder = 0;
+ }
- bool useTimeManagement() const { return !(maxTime | maxDepth | maxNodes | int(infinite)); }
+ bool use_time_management() const {
+ return !(mate | movetime | depth | nodes | infinite);
+ }
- int time, increment, movesToGo, maxTime, maxDepth, maxNodes;
- bool infinite, ponder;
+ std::vector<Move> searchmoves;
+ int time[COLOR_NB], inc[COLOR_NB], npmsec, movestogo, depth, movetime, mate, infinite, ponder;
+ int64_t nodes;
+ TimePoint startTime;
};
-extern void init_search();
-extern int64_t perft(Position& pos, Depth depth);
-extern bool think(Position& pos, const SearchLimits& limits, Move searchMoves[]);
+/// The SignalsType struct stores atomic flags updated during the search
+/// typically in an async fashion e.g. to stop the search by the GUI.
+
+struct SignalsType {
+ std::atomic_bool stop, stopOnPonderhit;
+};
+
+extern SignalsType Signals;
+extern LimitsType Limits;
+
+void init();
+void clear();
+template<bool Root = true> uint64_t perft(Position& pos, Depth depth);
+
+} // namespace Search
-#endif // !defined(SEARCH_H_INCLUDED)
+#endif // #ifndef SEARCH_H_INCLUDED