X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=src%2Fsearch.h;h=806295a1100f196811c745632b26568ed0ea4445;hb=HEAD;hp=abf7221d8a33bbbe9f22a66db31e4995932d0c3c;hpb=bb3427ca85bdb20b4c8af12b63f635d03c5e9146;p=stockfish

diff --git a/src/search.h b/src/search.h
index abf7221d..b2d22e61 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) 2004-2023 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
@@ -17,64 +16,100 @@
   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 "move.h"
+#include <cstdint>
+#include <vector>
+
+#include "misc.h"
+#include "movepick.h"
 #include "types.h"
 
-#include <vector>
+namespace Stockfish {
 
 class Position;
-struct SplitPoint;
-
-/// 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 SearchStack {
-  SplitPoint* sp;
-  int ply;
-  Move currentMove;
-  Move excludedMove;
-  Move bestMove;
-  Move killers[2];
-  Depth reduction;
-  Value eval;
-  Value evalMargin;
-  int skipNullMove;
-};
 
 namespace Search {
 
-/// 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.
 
-struct LimitsType {
+// 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;
+    PieceToHistory* continuationHistory;
+    int             ply;
+    Move            currentMove;
+    Move            excludedMove;
+    Move            killers[2];
+    Value           staticEval;
+    int             statScore;
+    int             moveCount;
+    bool            inCheck;
+    bool            ttPv;
+    bool            ttHit;
+    int             doubleExtensions;
+    int             cutoffCnt;
+};
 
-  LimitsType() {  memset(this, 0, sizeof(LimitsType)); }
-  bool useTimeManagement() const { return !(maxTime | maxDepth | maxNodes | infinite); }
 
-  int time, increment, movesToGo, maxTime, maxDepth, maxNodes, infinite, ponder;
+// 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; }
+    // Sort in descending order
+    bool operator<(const RootMove& m) const {
+        return m.score != score ? m.score < score : m.previousScore < previousScore;
+    }
+
+    Value             score           = -VALUE_INFINITE;
+    Value             previousScore   = -VALUE_INFINITE;
+    Value             averageScore    = -VALUE_INFINITE;
+    Value             uciScore        = -VALUE_INFINITE;
+    bool              scoreLowerbound = false;
+    bool              scoreUpperbound = false;
+    int               selDepth        = 0;
+    int               tbRank          = 0;
+    Value             tbScore;
+    std::vector<Move> pv;
 };
 
-struct SignalsType {
-  bool stopOnPonderhit, firstRootMove, stop, failedLowAtRoot;
+using RootMoves = std::vector<RootMove>;
+
+
+// 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 {
+
+    // Init explicitly due to broken value-initialization of non POD in MSVC
+    LimitsType() {
+        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 volatile SignalsType Signals;
 extern LimitsType Limits;
-extern std::vector<Move> RootMoves;
-extern Position RootPosition;
 
-extern void init();
-extern int64_t perft(Position& pos, Depth depth);
-extern void think();
+void init();
+void clear();
 
-}
+}  // namespace Search
 
-extern void do_timer_event();
+}  // namespace Stockfish
 
-#endif // !defined(SEARCH_H_INCLUDED)
+#endif  // #ifndef SEARCH_H_INCLUDED