git.sesse.net Git - stockfish/blob - src/main.cpp

   1 /*
   2   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   3   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
   4   Copyright (C) 2008-2015 Marco Costalba, Joona Kiiski, Tord Romstad
   5   Copyright (C) 2015-2019 Marco Costalba, Joona Kiiski, Gary Linscott, Tord Romstad
   6
   7   Stockfish is free software: you can redistribute it and/or modify
   8   it under the terms of the GNU General Public License as published by
   9   the Free Software Foundation, either version 3 of the License, or
  10   (at your option) any later version.
  11
  12   Stockfish is distributed in the hope that it will be useful,
  13   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15   GNU General Public License for more details.
  16
  17   You should have received a copy of the GNU General Public License
  18   along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include <iostream>
  22 #include <thread>
  23
  24 #include "bitboard.h"
  25 #include "position.h"
  26 #include "search.h"
  27 #include "thread.h"
  28 #include "tt.h"
  29 #include "uci.h"
  30 #include "syzygy/tbprobe.h"
  31
  32 #include <grpc/grpc.h>
  33 #include <grpc++/server.h>
  34 #include <grpc++/server_builder.h>
  35 #include "hashprobe.grpc.pb.h"
  36
  37 using grpc::Server;
  38 using grpc::ServerBuilder;
  39 using grpc::ServerContext;
  40 using grpc::Status;
  41 using grpc::StatusCode;
  42 using namespace hashprobe;
  43
  44 class HashProbeImpl final : public HashProbe::Service {
  45 public:
  46         Status Probe(ServerContext* context,
  47                      const HashProbeRequest* request,
  48                      HashProbeResponse *response) {
  49                 Position pos(request->fen(), /*isChess960=*/false, Threads.main());
  50                 if (!pos.pos_is_ok()) {
  51                         return Status(StatusCode::INVALID_ARGUMENT, "Invalid FEN");
  52                 }
  53
  54                 bool invert = (pos.side_to_move() == BLACK);
  55                 Search::StateStackPtr setup_states = Search::StateStackPtr(new std::stack<StateInfo>);
  56
  57                 ProbeMove(&pos, setup_states.get(), invert, response->mutable_root());
  58
  59                 MoveList<LEGAL> moves(pos);
  60                 for (const ExtMove* em = moves.begin(); em != moves.end(); ++em) {
  61                         HashProbeLine *line = response->add_line();
  62                         FillMove(em->move, line->mutable_move());
  63                         setup_states->push(StateInfo());
  64                         pos.do_move(em->move, setup_states->top(), pos.gives_check(em->move, CheckInfo(pos)));
  65                         ProbeMove(&pos, setup_states.get(), !invert, line);
  66                         pos.undo_move(em->move);
  67                 }
  68
  69                 return Status::OK;
  70         }
  71
  72         void FillMove(Move move, HashProbeMove* decoded) {
  73                 if (!is_ok(move)) return;
  74
  75                 Square from = from_sq(move);
  76                 Square to = to_sq(move);
  77
  78                 if (type_of(move) == CASTLING) {
  79                         to = make_square(to > from ? FILE_G : FILE_C, rank_of(from));
  80                 }
  81
  82                 decoded->set_from_sq(UCI::square(from));
  83                 decoded->set_to_sq(UCI::square(to));
  84
  85                 if (type_of(move) == PROMOTION) {
  86                         decoded->set_promotion(std::string() + " PNBRQK"[promotion_type(move)]);
  87                 }
  88         }
  89
  90         void ProbeMove(Position* pos, std::stack<StateInfo>* setup_states, bool invert, HashProbeLine* response) {
  91                 bool found;
  92                 TTEntry *entry = TT.probe(pos->key(), found);
  93                 response->set_found(found);
  94                 if (found) {
  95                         Value value = entry->value();
  96                         Value eval = entry->eval();
  97                         Bound bound = entry->bound();
  98
  99                         if (invert) {
 100                                 value = -value;
 101                                 eval = -eval;
 102                                 if (bound == BOUND_UPPER) {
 103                                         bound = BOUND_LOWER;
 104                                 } else if (bound == BOUND_LOWER) {
 105                                         bound = BOUND_UPPER;
 106                                 }
 107                         }
 108
 109                         response->set_depth(entry->depth());
 110                         FillValue(eval, response->mutable_eval());
 111                         if (entry->depth() > DEPTH_NONE) {
 112                                 FillValue(value, response->mutable_value());
 113                         }
 114                         response->set_bound(HashProbeLine::ValueBound(bound));
 115
 116                         // Follow the PV until we hit an illegal move.
 117                         std::stack<Move> pv;
 118                         std::set<Key> seen;
 119                         while (found && is_ok(entry->move())) {
 120                                 FillMove(entry->move(), response->add_pv());
 121                                 if (seen.count(pos->key())) break;
 122                                 pv.push(entry->move());
 123                                 seen.insert(pos->key());
 124                                 setup_states->push(StateInfo());
 125                                 pos->do_move(entry->move(), setup_states->top(), pos->gives_check(entry->move(), CheckInfo(*pos)));
 126                                 entry = TT.probe(pos->key(), found);
 127                         }
 128
 129                         // Unroll the PV back again, so the Position object remains unchanged.
 130                         while (!pv.empty()) {
 131                                 pos->undo_move(pv.top());
 132                                 pv.pop();
 133                         }
 134                 }
 135         }
 136
 137         void FillValue(Value value, HashProbeScore* score) {
 138                 if (abs(value) < VALUE_MATE - MAX_PLY) {
 139                         score->set_score_type(HashProbeScore::SCORE_CP);
 140                         score->set_score_cp(value * 100 / PawnValueEg);
 141                 } else {
 142                         score->set_score_type(HashProbeScore::SCORE_MATE);
 143                         score->set_score_mate((value > 0 ? VALUE_MATE - value + 1 : -VALUE_MATE - value) / 2);
 144                 }
 145         }
 146 };
 147
 148 class HashProbeThread {
 149 public:
 150         HashProbeThread(const std::string &server_address) {
 151                 builder.AddListeningPort(server_address, grpc::InsecureServerCredentials());
 152                 builder.RegisterService(&service);
 153                 server = std::move(builder.BuildAndStart());
 154                 std::cout << "Server listening on " << server_address << std::endl;
 155                 std::thread([this]{ server->Wait(); }).detach();
 156         }
 157
 158         void Shutdown() {
 159                 server->Shutdown();
 160         }
 161
 162 private:
 163         HashProbeImpl service;
 164         ServerBuilder builder;
 165         std::unique_ptr<Server> server;
 166 };
 167
 168 namespace PSQT {
 169   void init();
 170 }
 171
 172 int main(int argc, char* argv[]) {
 173
 174   std::cout << engine_info() << std::endl;
 175
 176   UCI::init(Options);
 177   PSQT::init();
 178   Bitboards::init();
 179   Position::init();
 180   Bitbases::init();
 181   Search::init();
 182   Pawns::init();
 183   Threads.set(Options["Threads"]);
 184   Search::clear(); // After threads are up
 185
 186   HashProbeThread thr("0.0.0.0:50051");
 187
 188   UCI::loop(argc, argv);
 189
 190   Threads.set(0);
 191   return 0;
 192 }