along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
-#include <cassert>
#include <iostream>
#include <sstream>
#include <string>
#include "evaluate.h"
#include "misc.h"
-#include "move.h"
#include "position.h"
#include "search.h"
+#include "thread.h"
#include "ucioption.h"
using namespace std;
namespace {
- // FEN string for the initial position
- const string StartPositionFEN = "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1";
+ // FEN string of the initial position, normal chess
+ const char* StartFEN = "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1";
// Keep track of position keys along the setup moves (from start position to the
- // position just before to start searching). This is needed by draw detection.
- std::vector<StateInfo> SetupState;
+ // position just before to start searching). This is needed by draw detection
+ // where, due to 50 moves rule, we need to check at most 100 plies back.
+ StateInfo StateRingBuf[102], *SetupState = StateRingBuf;
+
+ void set_option(istringstream& up);
+ void set_position(Position& pos, istringstream& up);
+ void go(Position& pos, istringstream& up);
+ void perft(Position& pos, istringstream& up);
+}
- // UCIParser is a class for parsing UCI input. The class
- // is actually a string stream built on a given input string.
- typedef istringstream UCIParser;
- void set_option(UCIParser& up);
- void set_position(Position& pos, UCIParser& up);
- bool go(Position& pos, UCIParser& up);
- void perft(Position& pos, UCIParser& up);
-}
+/// Wait for a command from the user, parse this text string as an UCI command,
+/// and call the appropriate functions. Also intercepts EOF from stdin to ensure
+/// that we exit gracefully if the GUI dies unexpectedly. In addition to the UCI
+/// commands, the function also supports a few debug commands.
+void uci_loop() {
-/// execute_uci_command() takes a string as input, uses a UCIParser
-/// object to parse this text string as a UCI command, and calls
-/// the appropriate functions. In addition to the UCI commands,
-/// the function also supports a few debug commands.
+ Position pos(StartFEN, false, 0); // The root position
+ string cmd, token;
-bool execute_uci_command(const string& cmd) {
+ while (token != "quit")
+ {
+ if (!getline(cin, cmd)) // Block here waiting for input
+ cmd = "quit";
- static Position pos(StartPositionFEN, false, 0); // The root position
+ istringstream is(cmd);
- UCIParser up(cmd);
- string token;
+ is >> skipws >> token;
- up >> skipws >> token;
+ if (token == "quit" || token == "stop")
+ {
+ Search::Signals.stop = true;
+ Threads[0].wake_up(); // In case is waiting for stop or ponderhit
+ }
- if (token == "quit")
- return false;
+ else if (token == "ponderhit")
+ {
+ // The opponent has played the expected move. GUI sends "ponderhit" if
+ // we were told to ponder on the same move the opponent has played. We
+ // should continue searching but switching from pondering to normal search.
+ Search::Limits.ponder = false;
- if (token == "go")
- return go(pos, up);
+ if (Search::Signals.stopOnPonderhit)
+ Search::Signals.stop = true;
- if (token == "ucinewgame")
- pos.from_fen(StartPositionFEN, false);
+ Threads[0].wake_up(); // In case is waiting for stop or ponderhit
+ }
- else if (token == "isready")
- cout << "readyok" << endl;
+ else if (token == "go")
+ go(pos, is);
- else if (token == "position")
- set_position(pos, up);
+ else if (token == "ucinewgame")
+ pos.from_fen(StartFEN, false);
- else if (token == "setoption")
- set_option(up);
+ else if (token == "isready")
+ cout << "readyok" << endl;
- else if (token == "perft")
- perft(pos, up);
+ else if (token == "position")
+ set_position(pos, is);
- else if (token == "d")
- pos.print();
+ else if (token == "setoption")
+ set_option(is);
- else if (token == "flip")
- pos.flip();
+ else if (token == "perft")
+ perft(pos, is);
- else if (token == "eval")
- {
- read_evaluation_uci_options(pos.side_to_move());
- cout << trace_evaluate(pos) << endl;
- }
+ else if (token == "d")
+ pos.print();
+
+ else if (token == "flip")
+ pos.flip_me();
- else if (token == "key")
- cout << "key: " << hex << pos.get_key()
- << "\nmaterial key: " << pos.get_material_key()
- << "\npawn key: " << pos.get_pawn_key() << endl;
+ else if (token == "eval")
+ {
+ read_evaluation_uci_options(pos.side_to_move());
+ cout << trace_evaluate(pos) << endl;
+ }
- else if (token == "uci")
- cout << "id name " << engine_name()
- << "\nid author " << engine_authors()
- << "\n" << Options.print_all()
- << "\nuciok" << endl;
- else
- cout << "Unknown command: " << cmd << endl;
+ else if (token == "key")
+ cout << "key: " << hex << pos.key()
+ << "\nmaterial key: " << pos.material_key()
+ << "\npawn key: " << pos.pawn_key() << endl;
- return true;
+ else if (token == "uci")
+ cout << "id name " << engine_name()
+ << "\nid author " << engine_authors()
+ << "\n" << Options.print_all()
+ << "\nuciok" << endl;
+ else
+ cout << "Unknown command: " << cmd << endl;
+ }
}
// fen string ("fen") or the starting position ("startpos") and then
// makes the moves given in the following move list ("moves").
- void set_position(Position& pos, UCIParser& up) {
+ void set_position(Position& pos, istringstream& is) {
Move m;
string token, fen;
- up >> token;
+ is >> token;
if (token == "startpos")
{
- pos.from_fen(StartPositionFEN, false);
- up >> token; // Consume "moves" token if any
+ fen = StartFEN;
+ is >> token; // Consume "moves" token if any
}
else if (token == "fen")
- {
- while (up >> token && token != "moves")
+ while (is >> token && token != "moves")
fen += token + " ";
+ else
+ return;
- pos.from_fen(fen, Options["UCI_Chess960"].value<bool>());
- }
- else return;
-
- SetupState.clear();
+ pos.from_fen(fen, Options["UCI_Chess960"].value<bool>());
// Parse move list (if any)
- while (up >> token && (m = move_from_uci(pos, token)) != MOVE_NONE)
+ while (is >> token && (m = move_from_uci(pos, token)) != MOVE_NONE)
{
- SetupState.push_back(StateInfo());
- pos.do_move(m, SetupState.back());
+ pos.do_move(m, *SetupState);
+
+ // Increment pointer to StateRingBuf circular buffer
+ if (++SetupState - StateRingBuf >= 102)
+ SetupState = StateRingBuf;
}
}
- // set_option() is called when engine receives the "setoption" UCI
- // command. The function updates the corresponding UCI option ("name")
- // to the given value ("value").
+ // set_option() is called when engine receives the "setoption" UCI command. The
+ // function updates the UCI option ("name") to the given value ("value").
- void set_option(UCIParser& up) {
+ void set_option(istringstream& is) {
string token, name, value;
- up >> token; // Consume "name" token
+ is >> token; // Consume "name" token
// Read option name (can contain spaces)
- while (up >> token && token != "value")
+ while (is >> token && token != "value")
name += string(" ", !name.empty()) + token;
// Read option value (can contain spaces)
- while (up >> token)
+ while (is >> token)
value += string(" ", !value.empty()) + token;
if (Options.find(name) != Options.end())
}
- // go() is called when engine receives the "go" UCI command. The
- // function sets the thinking time and other parameters from the input
- // string, and then calls think(). Returns false if a quit command
- // is received while thinking, true otherwise.
+ // go() is called when engine receives the "go" UCI command. The function sets
+ // the thinking time and other parameters from the input string, and then starts
+ // the main searching thread.
- bool go(Position& pos, UCIParser& up) {
+ void go(Position& pos, istringstream& is) {
string token;
- SearchLimits limits;
+ Search::LimitsType limits;
std::vector<Move> searchMoves;
int time[] = { 0, 0 }, inc[] = { 0, 0 };
- while (up >> token)
+ while (is >> token)
{
if (token == "infinite")
limits.infinite = true;
else if (token == "ponder")
limits.ponder = true;
else if (token == "wtime")
- up >> time[WHITE];
+ is >> time[WHITE];
else if (token == "btime")
- up >> time[BLACK];
+ is >> time[BLACK];
else if (token == "winc")
- up >> inc[WHITE];
+ is >> inc[WHITE];
else if (token == "binc")
- up >> inc[BLACK];
+ is >> inc[BLACK];
else if (token == "movestogo")
- up >> limits.movesToGo;
+ is >> limits.movesToGo;
else if (token == "depth")
- up >> limits.maxDepth;
+ is >> limits.maxDepth;
else if (token == "nodes")
- up >> limits.maxNodes;
+ is >> limits.maxNodes;
else if (token == "movetime")
- up >> limits.maxTime;
+ is >> limits.maxTime;
else if (token == "searchmoves")
- while (up >> token)
+ while (is >> token)
searchMoves.push_back(move_from_uci(pos, token));
}
- searchMoves.push_back(MOVE_NONE);
limits.time = time[pos.side_to_move()];
limits.increment = inc[pos.side_to_move()];
- return think(pos, limits, &searchMoves[0]);
+ Threads.start_thinking(pos, limits, searchMoves, true);
}
- // perft() is called when engine receives the "perft" command.
- // The function calls perft() passing the required search depth
- // then prints counted leaf nodes and elapsed time.
+ // perft() is called when engine receives the "perft" command. The function
+ // calls perft() with the required search depth then prints counted leaf nodes
+ // and elapsed time.
- void perft(Position& pos, UCIParser& up) {
+ void perft(Position& pos, istringstream& is) {
int depth, time;
- int64_t n;
- if (!(up >> depth))
+ if (!(is >> depth))
return;
- time = get_system_time();
+ time = system_time();
- n = perft(pos, depth * ONE_PLY);
+ int64_t n = Search::perft(pos, depth * ONE_PLY);
- time = get_system_time() - time;
+ time = system_time() - time;
std::cout << "\nNodes " << n
<< "\nTime (ms) " << time
projects / stockfish / blobdiff