Refactor previous patch

[stockfish] / src / pawns.h

diff --git a/src/pawns.h b/src/pawns.h
index cc3e5e6689163ebd41132ca4130abded8803ec17..e26ae67e0f9146d4de45f0ed9526a904404f1617 100644 (file)
--- a/src/pawns.h
+++ b/src/pawns.h
@@ -1,7 +1,8 @@
 /*
   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
@@ -17,90 +18,71 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-#if !defined(PAWNS_H_INCLUDED)
+#ifndef PAWNS_H_INCLUDED
 #define PAWNS_H_INCLUDED
 
+#include "misc.h"
 #include "position.h"
-#include "tt.h"
 #include "types.h"
 
-const int PawnTableSize = 16384;
+namespace Pawns {
 
-/// PawnInfo is a class which contains various information about a pawn
-/// structure. Currently, it only includes a middle game and an end game
-/// pawn structure evaluation, and a bitboard of passed pawns. We may want
-/// to add further information in the future. A lookup to the pawn hash table
-/// (performed by calling the get_pawn_info method in a PawnInfoTable object)
-/// returns a pointer to a PawnInfo object.
-class PawnInfo {
+/// Pawns::Entry contains various information about a pawn structure. A lookup
+/// to the pawn hash table (performed by calling the probe function) returns a
+/// pointer to an Entry object.
 
-  friend class PawnInfoTable;
+struct Entry {
 
-public:
-  Score pawns_value() const;
-  Bitboard pawn_attacks(Color c) const;
-  Bitboard passed_pawns(Color c) const;
-  int file_is_half_open(Color c, File f) const;
-  int has_open_file_to_left(Color c, File f) const;
-  int has_open_file_to_right(Color c, File f) const;
-
-  template<Color Us>
-  Score king_shelter(const Position& pos, Square ksq);
-
-private:
-  template<Color Us>
-  Score updateShelter(const Position& pos, Square ksq);
-
-  Key key;
-  Bitboard passedPawns[2];
-  Bitboard pawnAttacks[2];
-  Square kingSquares[2];
-  Score value;
-  int halfOpenFiles[2];
-  Score kingShelters[2];
-};
+  Score pawns_score() const { return score; }
+  Bitboard pawn_attacks(Color c) const { return pawnAttacks[c]; }
+  Bitboard passed_pawns(Color c) const { return passedPawns[c]; }
+  Bitboard pawn_attacks_span(Color c) const { return pawnAttacksSpan[c]; }
+  int pawn_asymmetry() const { return asymmetry; }
+  int open_files() const { return openFiles; }
 
+  int semiopen_file(Color c, File f) const {
+    return semiopenFiles[c] & (1 << f);
+  }
 
-/// The PawnInfoTable class represents a pawn hash table. The most important
-/// method is get_pawn_info, which returns a pointer to a PawnInfo object.
+  int semiopen_side(Color c, File f, bool leftSide) const {
+    return semiopenFiles[c] & (leftSide ? (1 << f) - 1 : ~((1 << (f + 1)) - 1));
+  }
 
-class PawnInfoTable : public SimpleHash<PawnInfo, PawnTableSize> {
-public:
-  PawnInfo* get_pawn_info(const Position& pos) const;
+  int pawns_on_same_color_squares(Color c, Square s) const {
+    return pawnsOnSquares[c][!!(DarkSquares & s)];
+  }
 
-private:
   template<Color Us>
-  Score evaluate_pawns(const Position& pos, Bitboard ourPawns, Bitboard theirPawns, PawnInfo* pi) const;
-};
-
+  Score king_safety(const Position& pos, Square ksq) {
+    return  kingSquares[Us] == ksq && castlingRights[Us] == pos.can_castle(Us)
+          ? kingSafety[Us] : (kingSafety[Us] = do_king_safety<Us>(pos, ksq));
+  }
 
-inline Score PawnInfo::pawns_value() const {
-  return value;
-}
-
-inline Bitboard PawnInfo::pawn_attacks(Color c) const {
-  return pawnAttacks[c];
-}
+  template<Color Us>
+  Score do_king_safety(const Position& pos, Square ksq);
 
-inline Bitboard PawnInfo::passed_pawns(Color c) const {
-  return passedPawns[c];
-}
+  template<Color Us>
+  Value shelter_storm(const Position& pos, Square ksq);
 
-inline int PawnInfo::file_is_half_open(Color c, File f) const {
-  return halfOpenFiles[c] & (1 << int(f));
-}
+  Key key;
+  Score score;
+  Bitboard passedPawns[COLOR_NB];
+  Bitboard pawnAttacks[COLOR_NB];
+  Bitboard pawnAttacksSpan[COLOR_NB];
+  Square kingSquares[COLOR_NB];
+  Score kingSafety[COLOR_NB];
+  int castlingRights[COLOR_NB];
+  int semiopenFiles[COLOR_NB];
+  int pawnsOnSquares[COLOR_NB][COLOR_NB]; // [color][light/dark squares]
+  int asymmetry;
+  int openFiles;
+};
 
-inline int PawnInfo::has_open_file_to_left(Color c, File f) const {
-  return halfOpenFiles[c] & ((1 << int(f)) - 1);
-}
+typedef HashTable<Entry, 16384> Table;
 
-inline int PawnInfo::has_open_file_to_right(Color c, File f) const {
-  return halfOpenFiles[c] & ~((1 << int(f+1)) - 1);
-}
+void init();
+Entry* probe(const Position& pos);
 
-template<Color Us>
-inline Score PawnInfo::king_shelter(const Position& pos, Square ksq) {
-  return kingSquares[Us] == ksq ? kingShelters[Us] : updateShelter<Us>(pos, ksq);
-}
+} // namespace Pawns
 
-#endif // !defined(PAWNS_H_INCLUDED)
+#endif // #ifndef PAWNS_H_INCLUDED