Move struct RootMove to Search namespace

[stockfish] / src / search.h

diff --git a/src/search.h b/src/search.h
index 0bdabdac6507cf89859eb2d3aec83e4b2264cf09..a4cba6bf700ed7e716b8a8aaf2fdd1c723290b42 100644 (file)
--- a/src/search.h
+++ b/src/search.h
@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008 Marco Costalba
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, 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
@@ -17,75 +17,89 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-
 #if !defined(SEARCH_H_INCLUDED)
 #define SEARCH_H_INCLUDED
 
-////
-//// Includes
-////
+#include <cstring>
+#include <vector>
 
-#include "depth.h"
-#include "history.h"
-#include "lock.h"
-#include "movegen.h"
-#include "position.h"
-#include "tt.h"
-#include "value.h"
+#include "types.h"
 
+class Position;
+struct SplitPoint;
 
-////
-//// Constants
-////
+namespace Search {
 
-const int PLY_MAX = 100;
-const int PLY_MAX_PLUS_2 = 102;
-const int KILLER_MAX = 2;
+/// The 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 {
+  SplitPoint* sp;
+  int ply;
+  Move currentMove;
+  Move excludedMove;
+  Move bestMove;
+  Move killers[2];
+  Depth reduction;
+  Value eval;
+  Value evalMargin;
+  int skipNullMove;
+};
 
-////
-//// 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.
+/// RootMove struct is used for moves at the root of the tree. For each root
+/// move we store a score, a node count, 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 {
 
-struct SearchStack {
-  Move pv[PLY_MAX];
-  Move currentMove;
-  Value currentMoveCaptureValue;
-  Move mateKiller;
-  Move threatMove;
-  Move killers[KILLER_MAX];
-  Depth reduction;
+  RootMove(){} // Needed by sort()
+  RootMove(Move m) : score(-VALUE_INFINITE), prevScore(-VALUE_INFINITE) {
+    pv.push_back(m); pv.push_back(MOVE_NONE);
+  }
+
+  bool operator<(const RootMove& m) const { return score < m.score; }
+  bool operator==(const Move& m) const { return pv[0] == m; }
+
+  void extract_pv_from_tt(Position& pos);
+  void insert_pv_in_tt(Position& pos);
+
+  Value score;
+  Value prevScore;
+  std::vector<Move> pv;
 };
 
 
-////
-//// Global variables
-////
+/// The 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 is our opponent's side to move.
 
-extern SearchStack EmptySearchStack;
-extern TranspositionTable TT;
-extern int ActiveThreads;
-extern Lock SMPLock;
+struct LimitsType {
 
-// Perhaps better to make H local, and pass as parameter to MovePicker?
-extern History H;
+  LimitsType() { memset(this, 0, sizeof(LimitsType)); }
+  bool use_time_management() const { return !(maxTime | maxDepth | maxNodes | infinite); }
+
+  int time, increment, movesToGo, maxTime, maxDepth, maxNodes, infinite, ponder;
+};
 
 
-////
-//// Prototypes
-////
+/// The SignalsType struct stores volatile flags updated during the search
+/// typically in an async fashion, for instance to stop the search by the GUI.
+
+struct SignalsType {
+  bool stopOnPonderhit, firstRootMove, stop, failedLowAtRoot;
+};
+
+extern volatile SignalsType Signals;
+extern LimitsType Limits;
+extern std::vector<RootMove> RootMoves;
+extern Position RootPosition;
 
-extern void init_threads();
-extern void stop_threads();
-extern void think(const Position &pos, bool infinite, bool ponder, int side_to_move,
-                  int time[], int increment[], int movesToGo, int maxDepth,
-                  int maxNodes, int maxTime, Move searchMoves[]);
-extern int64_t nodes_searched();
+extern void init();
+extern int64_t perft(Position& pos, Depth depth);
+extern void think();
 
+} // namespace Search
 
 #endif // !defined(SEARCH_H_INCLUDED)