X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fsearch.h;h=3bf3e9ae605727fc9235812782c884e25d259d6c;hp=1940c1b52cdf5b8b0c936092ea6ec784def576ae;hb=550fed3343089357dc89ecf78ce8eb4b35bcab88;hpb=1e7aaed8bc4247a742d515811f0e484ff40309b8

diff --git a/src/search.h b/src/search.h
index 1940c1b5..3bf3e9ae 100644
--- a/src/search.h
+++ b/src/search.h
@@ -1,7 +1,6 @@
 /*
   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) 2004-2021 The Stockfish developers (see AUTHORS file)
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -17,62 +16,94 @@
   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
 
-////
-//// Includes
-////
-
-#include "depth.h"
-#include "move.h"
-#include "value.h"
+#include <vector>
 
+#include "misc.h"
+#include "movepick.h"
+#include "types.h"
 
-////
-//// Constants
-////
+class Position;
 
-const int PLY_MAX = 100;
-const int PLY_MAX_PLUS_2 = PLY_MAX + 2;
+namespace Search {
 
+/// Threshold used for countermoves based pruning
+constexpr int CounterMovePruneThreshold = 0;
 
-////
-//// Types
-////
 
-/// 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.
-struct EvalInfo;
-struct SplitPoint;
+/// 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 SearchStack {
+struct Stack {
+  Move* pv;
+  PieceToHistory* continuationHistory;
+  int ply;
   Move currentMove;
-  Move mateKiller;
   Move excludedMove;
-  Move bestMove;
   Move killers[2];
-  Depth reduction;
-  Value eval;
-  Value evalMargin;
-  bool skipNullMove;
-  SplitPoint* sp;
+  Value staticEval;
+  int statScore;
+  int moveCount;
+  bool inCheck;
+  bool ttPv;
+  bool ttHit;
 };
 
 
-////
-//// Prototypes
-////
-class Position;
+/// 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 extract_ponder_from_tt(Position& pos);
+  bool operator==(const Move& m) const { return pv[0] == m; }
+  bool operator<(const RootMove& m) const { // Sort in descending order
+    return m.score != score ? m.score < score
+                            : m.previousScore < previousScore;
+  }
+
+  Value score = -VALUE_INFINITE;
+  Value previousScore = -VALUE_INFINITE;
+  int selDepth = 0;
+  int tbRank = 0;
+  Value tbScore;
+  std::vector<Move> pv;
+};
+
+typedef std::vector<RootMove> RootMoves;
+
+
+/// LimitsType struct stores information sent by GUI about available time to
+/// search the current move, maximum depth/time, or if we are in analysis mode.
+
+struct LimitsType {
+
+  LimitsType() { // Init explicitly due to broken value-initialization of non POD in MSVC
+    time[WHITE] = time[BLACK] = inc[WHITE] = inc[BLACK] = npmsec = movetime = TimePoint(0);
+    movestogo = depth = mate = perft = infinite = 0;
+    nodes = 0;
+  }
+
+  bool use_time_management() const {
+    return time[WHITE] || time[BLACK];
+  }
+
+  std::vector<Move> searchmoves;
+  TimePoint time[COLOR_NB], inc[COLOR_NB], npmsec, movetime, startTime;
+  int movestogo, depth, mate, perft, infinite;
+  int64_t nodes;
+};
+
+extern LimitsType Limits;
+
+void init();
+void clear();
 
-extern void init_search();
-extern void init_threads();
-extern void exit_threads();
-extern int64_t perft(Position& pos, Depth depth);
-extern bool think(Position& pos, bool infinite, bool ponder, int time[], int increment[],
-                  int movesToGo, int maxDepth, int maxNodes, int maxTime, Move searchMoves[]);
+} // namespace Search
 
-#endif // !defined(SEARCH_H_INCLUDED)
+#endif // #ifndef SEARCH_H_INCLUDED