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98
src/psqtab.h
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/*
Stockfish, a UCI chess playing engine derived from Glaurung 2.1
Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
Copyright (C) 2008-2014 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
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Stockfish is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef PSQTAB_H_INCLUDED
#define PSQTAB_H_INCLUDED
#include "types.h"
#define S(mg, eg) make_score(mg, eg)
/// PSQT[PieceType][Square] contains Piece-Square scores. For each piece type on
/// a given square a (middlegame, endgame) score pair is assigned. PSQT is defined
/// for the white side and the tables are symmetric for the black side.
static const Score PSQT[][SQUARE_NB] = {
{ },
{ // Pawn
S( 0, 0), S( 0, 0), S( 0, 0), S( 0, 0), S(0, 0), S( 0, 0), S( 0, 0), S( 0, 0),
S(-20, 0), S( 0, 0), S( 0, 0), S( 0, 0), S(0, 0), S( 0, 0), S( 0, 0), S(-20, 0),
S(-20, 0), S( 0, 0), S(10, 0), S(20, 0), S(20, 0), S(10, 0), S( 0, 0), S(-20, 0),
S(-20, 0), S( 0, 0), S(20, 0), S(40, 0), S(40, 0), S(20, 0), S( 0, 0), S(-20, 0),
S(-20, 0), S( 0, 0), S(10, 0), S(20, 0), S(20, 0), S(10, 0), S( 0, 0), S(-20, 0),
S(-20, 0), S( 0, 0), S( 0, 0), S( 0, 0), S(0, 0), S( 0, 0), S( 0, 0), S(-20, 0),
S(-20, 0), S( 0, 0), S( 0, 0), S( 0, 0), S(0, 0), S( 0, 0), S( 0, 0), S(-20, 0),
S( 0, 0), S( 0, 0), S( 0, 0), S( 0, 0), S(0, 0), S( 0, 0), S( 0, 0), S( 0, 0)
},
{ // Knight
S(-144,-98), S(-109,-83), S(-85,-51), S(-73,-16), S(-73,-16), S(-85,-51), S(-109,-83), S(-144,-98),
S( -88,-68), S( -43,-53), S(-19,-21), S( -7, 14), S( -7, 14), S(-19,-21), S( -43,-53), S( -88,-68),
S( -69,-53), S( -24,-38), S( 0, -6), S( 12, 29), S( 12, 29), S( 0, -6), S( -24,-38), S( -69,-53),
S( -28,-42), S( 17,-27), S( 41, 5), S( 53, 40), S( 53, 40), S( 41, 5), S( 17,-27), S( -28,-42),
S( -30,-42), S( 15,-27), S( 39, 5), S( 51, 40), S( 51, 40), S( 39, 5), S( 15,-27), S( -30,-42),
S( -10,-53), S( 35,-38), S( 59, -6), S( 71, 29), S( 71, 29), S( 59, -6), S( 35,-38), S( -10,-53),
S( -64,-68), S( -19,-53), S( 5,-21), S( 17, 14), S( 17, 14), S( 5,-21), S( -19,-53), S( -64,-68),
S(-200,-98), S( -65,-83), S(-41,-51), S(-29,-16), S(-29,-16), S(-41,-51), S( -65,-83), S(-200,-98)
},
{ // Bishop
S(-54,-65), S(-27,-42), S(-34,-44), S(-43,-26), S(-43,-26), S(-34,-44), S(-27,-42), S(-54,-65),
S(-29,-43), S( 8,-20), S( 1,-22), S( -8, -4), S( -8, -4), S( 1,-22), S( 8,-20), S(-29,-43),
S(-20,-33), S( 17,-10), S( 10,-12), S( 1, 6), S( 1, 6), S( 10,-12), S( 17,-10), S(-20,-33),
S(-19,-35), S( 18,-12), S( 11,-14), S( 2, 4), S( 2, 4), S( 11,-14), S( 18,-12), S(-19,-35),
S(-22,-35), S( 15,-12), S( 8,-14), S( -1, 4), S( -1, 4), S( 8,-14), S( 15,-12), S(-22,-35),
S(-28,-33), S( 9,-10), S( 2,-12), S( -7, 6), S( -7, 6), S( 2,-12), S( 9,-10), S(-28,-33),
S(-32,-43), S( 5,-20), S( -2,-22), S(-11, -4), S(-11, -4), S( -2,-22), S( 5,-20), S(-32,-43),
S(-49,-65), S(-22,-42), S(-29,-44), S(-38,-26), S(-38,-26), S(-29,-44), S(-22,-42), S(-49,-65)
},
{ // Rook
S(-22, 3), S(-17, 3), S(-12, 3), S(-8, 3), S(-8, 3), S(-12, 3), S(-17, 3), S(-22, 3),
S(-22, 3), S( -7, 3), S( -2, 3), S( 2, 3), S( 2, 3), S( -2, 3), S( -7, 3), S(-22, 3),
S(-22, 3), S( -7, 3), S( -2, 3), S( 2, 3), S( 2, 3), S( -2, 3), S( -7, 3), S(-22, 3),
S(-22, 3), S( -7, 3), S( -2, 3), S( 2, 3), S( 2, 3), S( -2, 3), S( -7, 3), S(-22, 3),
S(-22, 3), S( -7, 3), S( -2, 3), S( 2, 3), S( 2, 3), S( -2, 3), S( -7, 3), S(-22, 3),
S(-22, 3), S( -7, 3), S( -2, 3), S( 2, 3), S( 2, 3), S( -2, 3), S( -7, 3), S(-22, 3),
S(-11, 3), S( 4, 3), S( 9, 3), S(13, 3), S(13, 3), S( 9, 3), S( 4, 3), S(-11, 3),
S(-22, 3), S(-17, 3), S(-12, 3), S(-8, 3), S(-8, 3), S(-12, 3), S(-17, 3), S(-22, 3)
},
{ // Queen
S(-2,-80), S(-2,-54), S(-2,-42), S(-2,-30), S(-2,-30), S(-2,-42), S(-2,-54), S(-2,-80),
S(-2,-54), S( 8,-30), S( 8,-18), S( 8, -6), S( 8, -6), S( 8,-18), S( 8,-30), S(-2,-54),
S(-2,-42), S( 8,-18), S( 8, -6), S( 8, 6), S( 8, 6), S( 8, -6), S( 8,-18), S(-2,-42),
S(-2,-30), S( 8, -6), S( 8, 6), S( 8, 18), S( 8, 18), S( 8, 6), S( 8, -6), S(-2,-30),
S(-2,-30), S( 8, -6), S( 8, 6), S( 8, 18), S( 8, 18), S( 8, 6), S( 8, -6), S(-2,-30),
S(-2,-42), S( 8,-18), S( 8, -6), S( 8, 6), S( 8, 6), S( 8, -6), S( 8,-18), S(-2,-42),
S(-2,-54), S( 8,-30), S( 8,-18), S( 8, -6), S( 8, -6), S( 8,-18), S( 8,-30), S(-2,-54),
S(-2,-80), S(-2,-54), S(-2,-42), S(-2,-30), S(-2,-30), S(-2,-42), S(-2,-54), S(-2,-80)
},
{ // King
S(298, 27), S(332, 81), S(273,108), S(225,116), S(225,116), S(273,108), S(332, 81), S(298, 27),
S(287, 74), S(321,128), S(262,155), S(214,163), S(214,163), S(262,155), S(321,128), S(287, 74),
S(224,111), S(258,165), S(199,192), S(151,200), S(151,200), S(199,192), S(258,165), S(224,111),
S(196,135), S(230,189), S(171,216), S(123,224), S(123,224), S(171,216), S(230,189), S(196,135),
S(173,135), S(207,189), S(148,216), S(100,224), S(100,224), S(148,216), S(207,189), S(173,135),
S(146,111), S(180,165), S(121,192), S( 73,200), S( 73,200), S(121,192), S(180,165), S(146,111),
S(119, 74), S(153,128), S( 94,155), S( 46,163), S( 46,163), S( 94,155), S(153,128), S(119, 74),
S( 98, 27), S(132, 81), S( 73,108), S( 25,116), S( 25,116), S( 73,108), S(132, 81), S( 98, 27)
}
};
#undef S
#endif // #ifndef PSQTAB_H_INCLUDED

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src/search.cpp
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src/search.h
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/*
Stockfish, a UCI chess playing engine derived from Glaurung 2.1
Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
Copyright (C) 2008-2014 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
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Stockfish is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef SEARCH_H_INCLUDED
#define SEARCH_H_INCLUDED
#include <memory>
#include <stack>
#include <vector>
#include "misc.h"
#include "position.h"
#include "types.h"
struct SplitPoint;
namespace Search {
/// 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* splitPoint;
Move* pv;
int ply;
Move currentMove;
Move ttMove;
Move excludedMove;
Move killers[2];
Depth reduction;
Value staticEval;
bool skipEarlyPruning;
};
/// 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 {
RootMove(Move m) : score(-VALUE_INFINITE), previousScore(-VALUE_INFINITE), pv(1, m) {}
bool operator<(const RootMove& m) const { return score > m.score; } // Ascending sort
bool operator==(const Move& m) const { return pv[0] == m; }
void insert_pv_in_tt(Position& pos);
Value score;
Value previousScore;
std::vector<Move> pv;
};
typedef std::vector<RootMove> RootMoveVector;
/// 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 it's our opponent's turn to move.
struct LimitsType {
LimitsType() { // Using memset on a std::vector is undefined behavior
nodes = time[WHITE] = time[BLACK] = inc[WHITE] = inc[BLACK] = movestogo =
depth = movetime = mate = infinite = ponder = 0;
}
bool use_time_management() const { return !(mate | movetime | depth | nodes | infinite); }
std::vector<Move> searchmoves;
int time[COLOR_NB], inc[COLOR_NB], movestogo, depth, movetime, mate, infinite, ponder;
int64_t nodes;
};
/// The SignalsType struct stores volatile flags updated during the search
/// typically in an async fashion e.g. to stop the search by the GUI.
struct SignalsType {
bool stop, stopOnPonderhit, firstRootMove, failedLowAtRoot;
};
typedef std::auto_ptr<std::stack<StateInfo> > StateStackPtr;
extern volatile SignalsType Signals;
extern LimitsType Limits;
extern RootMoveVector RootMoves;
extern Position RootPos;
extern Time::point SearchTime;
extern StateStackPtr SetupStates;
void init();
void think();
template<bool Root> uint64_t perft(Position& pos, Depth depth);
} // namespace Search
#endif // #ifndef SEARCH_H_INCLUDED

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/*
Stockfish, a UCI chess playing engine derived from Glaurung 2.1
Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
Copyright (C) 2008-2014 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
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Stockfish is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <algorithm> // For std::count
#include <cassert>
#include "movegen.h"
#include "search.h"
#include "thread.h"
#include "uci.h"
using namespace Search;
ThreadPool Threads; // Global object
extern void check_time();
namespace {
// start_routine() is the C function which is called when a new thread
// is launched. It is a wrapper to the virtual function idle_loop().
extern "C" { long start_routine(ThreadBase* th) { th->idle_loop(); return 0; } }
// Helpers to launch a thread after creation and joining before delete. Must be
// outside Thread c'tor and d'tor because the object must be fully initialized
// when start_routine (and hence virtual idle_loop) is called and when joining.
template<typename T> T* new_thread() {
T* th = new T();
thread_create(th->handle, start_routine, th); // Will go to sleep
return th;
}
void delete_thread(ThreadBase* th) {
th->mutex.lock();
th->exit = true; // Search must be already finished
th->mutex.unlock();
th->notify_one();
thread_join(th->handle); // Wait for thread termination
delete th;
}
}
// ThreadBase::notify_one() wakes up the thread when there is some work to do
void ThreadBase::notify_one() {
mutex.lock();
sleepCondition.notify_one();
mutex.unlock();
}
// ThreadBase::wait_for() set the thread to sleep until 'condition' turns true
void ThreadBase::wait_for(volatile const bool& condition) {
mutex.lock();
while (!condition) sleepCondition.wait(mutex);
mutex.unlock();
}
// Thread c'tor makes some init but does not launch any execution thread that
// will be started only when c'tor returns.
Thread::Thread() /* : splitPoints() */ { // Value-initialization bug in MSVC
searching = false;
maxPly = splitPointsSize = 0;
activeSplitPoint = NULL;
activePosition = NULL;
idx = Threads.size(); // Starts from 0
}
// Thread::cutoff_occurred() checks whether a beta cutoff has occurred in the
// current active split point, or in some ancestor of the split point.
bool Thread::cutoff_occurred() const {
for (SplitPoint* sp = activeSplitPoint; sp; sp = sp->parentSplitPoint)
if (sp->cutoff)
return true;
return false;
}
// Thread::available_to() checks whether the thread is available to help the
// thread 'master' at a split point. An obvious requirement is that thread must
// be idle. With more than two threads, this is not sufficient: If the thread is
// the master of some split point, it is only available as a slave to the slaves
// which are busy searching the split point at the top of slave's split point
// stack (the "helpful master concept" in YBWC terminology).
bool Thread::available_to(const Thread* master) const {
if (searching)
return false;
// Make a local copy to be sure it doesn't become zero under our feet while
// testing next condition and so leading to an out of bounds access.
const int size = splitPointsSize;
// No split points means that the thread is available as a slave for any
// other thread otherwise apply the "helpful master" concept if possible.
return !size || splitPoints[size - 1].slavesMask.test(master->idx);
}
// Thread::split() does the actual work of distributing the work at a node between
// several available threads. If it does not succeed in splitting the node
// (because no idle threads are available), the function immediately returns.
// If splitting is possible, a SplitPoint object is initialized with all the
// data that must be copied to the helper threads and then helper threads are
// informed that they have been assigned work. This will cause them to instantly
// leave their idle loops and call search(). When all threads have returned from
// search() then split() returns.
void Thread::split(Position& pos, Stack* ss, Value alpha, Value beta, Value* bestValue,
Move* bestMove, Depth depth, int moveCount,
MovePicker* movePicker, int nodeType, bool cutNode) {
assert(searching);
assert(-VALUE_INFINITE < *bestValue && *bestValue <= alpha && alpha < beta && beta <= VALUE_INFINITE);
assert(depth >= Threads.minimumSplitDepth);
assert(splitPointsSize < MAX_SPLITPOINTS_PER_THREAD);
// Pick and init the next available split point
SplitPoint& sp = splitPoints[splitPointsSize];
sp.masterThread = this;
sp.parentSplitPoint = activeSplitPoint;
sp.slavesMask = 0, sp.slavesMask.set(idx);
sp.depth = depth;
sp.bestValue = *bestValue;
sp.bestMove = *bestMove;
sp.alpha = alpha;
sp.beta = beta;
sp.nodeType = nodeType;
sp.cutNode = cutNode;
sp.movePicker = movePicker;
sp.moveCount = moveCount;
sp.pos = &pos;
sp.nodes = 0;
sp.cutoff = false;
sp.ss = ss;
// Try to allocate available threads and ask them to start searching setting
// 'searching' flag. This must be done under lock protection to avoid concurrent
// allocation of the same slave by another master.
Threads.mutex.lock();
sp.mutex.lock();
sp.allSlavesSearching = true; // Must be set under lock protection
++splitPointsSize;
activeSplitPoint = &sp;
activePosition = NULL;
Thread* slave;
while ((slave = Threads.available_slave(this)) != NULL)
{
sp.slavesMask.set(slave->idx);
slave->activeSplitPoint = &sp;
slave->searching = true; // Slave leaves idle_loop()
slave->notify_one(); // Could be sleeping
}
// Everything is set up. The master thread enters the idle loop, from which
// it will instantly launch a search, because its 'searching' flag is set.
// The thread will return from the idle loop when all slaves have finished
// their work at this split point.
sp.mutex.unlock();
Threads.mutex.unlock();
Thread::idle_loop(); // Force a call to base class idle_loop()
// In the helpful master concept, a master can help only a sub-tree of its
// split point and because everything is finished here, it's not possible
// for the master to be booked.
assert(!searching);
assert(!activePosition);
// We have returned from the idle loop, which means that all threads are
// finished. Note that setting 'searching' and decreasing splitPointsSize must
// be done under lock protection to avoid a race with Thread::available_to().
Threads.mutex.lock();
sp.mutex.lock();
searching = true;
--splitPointsSize;
activeSplitPoint = sp.parentSplitPoint;
activePosition = &pos;
pos.set_nodes_searched(pos.nodes_searched() + sp.nodes);
*bestMove = sp.bestMove;
*bestValue = sp.bestValue;
sp.mutex.unlock();
Threads.mutex.unlock();
}
// TimerThread::idle_loop() is where the timer thread waits Resolution milliseconds
// and then calls check_time(). When not searching, thread sleeps until it's woken up.
void TimerThread::idle_loop() {
while (!exit)
{
mutex.lock();
if (!exit)
sleepCondition.wait_for(mutex, run ? Resolution : INT_MAX);
mutex.unlock();
if (run)
check_time();
}
}
// MainThread::idle_loop() is where the main thread is parked waiting to be started
// when there is a new search. The main thread will launch all the slave threads.
void MainThread::idle_loop() {
while (!exit)
{
mutex.lock();
thinking = false;
while (!thinking && !exit)
{
Threads.sleepCondition.notify_one(); // Wake up the UI thread if needed
sleepCondition.wait(mutex);
}
mutex.unlock();
if (!exit)
{
searching = true;
Search::think();
assert(searching);
searching = false;
}
}
}
// ThreadPool::init() is called at startup to create and launch requested threads,
// that will go immediately to sleep. We cannot use a c'tor because Threads is a
// static object and we need a fully initialized engine at this point due to
// allocation of Endgames in Thread c'tor.
void ThreadPool::init() {
timer = new_thread<TimerThread>();
push_back(new_thread<MainThread>());
read_uci_options();
}
// ThreadPool::exit() terminates the threads before the program exits. Cannot be
// done in d'tor because threads must be terminated before freeing us.
void ThreadPool::exit() {
delete_thread(timer); // As first because check_time() accesses threads data
for (iterator it = begin(); it != end(); ++it)
delete_thread(*it);
}
// ThreadPool::read_uci_options() updates internal threads parameters from the
// corresponding UCI options and creates/destroys threads to match the requested
// number. Thread objects are dynamically allocated to avoid creating all possible
// threads in advance (which include pawns and material tables), even if only a
// few are to be used.
void ThreadPool::read_uci_options() {
minimumSplitDepth = Options["Min Split Depth"] * ONE_PLY;
size_t requested = Options["Threads"];
assert(requested > 0);
// If zero (default) then set best minimum split depth automatically
if (!minimumSplitDepth)
minimumSplitDepth = requested < 8 ? 4 * ONE_PLY : 7 * ONE_PLY;
while (size() < requested)
push_back(new_thread<Thread>());
while (size() > requested)
{
delete_thread(back());
pop_back();
}
}
// ThreadPool::available_slave() tries to find an idle thread which is available
// as a slave for the thread 'master'.
Thread* ThreadPool::available_slave(const Thread* master) const {
for (const_iterator it = begin(); it != end(); ++it)
if ((*it)->available_to(master))
return *it;
return NULL;
}
// ThreadPool::wait_for_think_finished() waits for main thread to finish the search
void ThreadPool::wait_for_think_finished() {
MainThread* th = main();
th->mutex.lock();
while (th->thinking) sleepCondition.wait(th->mutex);
th->mutex.unlock();
}
// ThreadPool::start_thinking() wakes up the main thread sleeping in
// MainThread::idle_loop() and starts a new search, then returns immediately.
void ThreadPool::start_thinking(const Position& pos, const LimitsType& limits,
StateStackPtr& states) {
wait_for_think_finished();
SearchTime = Time::now(); // As early as possible
Signals.stopOnPonderhit = Signals.firstRootMove = false;
Signals.stop = Signals.failedLowAtRoot = false;
RootMoves.clear();
RootPos = pos;
Limits = limits;
if (states.get()) // If we don't set a new position, preserve current state
{
SetupStates = states; // Ownership transfer here
assert(!states.get());
}
for (MoveList<LEGAL> it(pos); *it; ++it)
if ( limits.searchmoves.empty()
|| std::count(limits.searchmoves.begin(), limits.searchmoves.end(), *it))
RootMoves.push_back(RootMove(*it));
main()->thinking = true;
main()->notify_one(); // Starts main thread
}

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/*
Stockfish, a UCI chess playing engine derived from Glaurung 2.1
Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
Copyright (C) 2008-2014 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
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Stockfish is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef THREAD_H_INCLUDED
#define THREAD_H_INCLUDED
#include <bitset>
#include <vector>
#include "material.h"
#include "movepick.h"
#include "pawns.h"
#include "position.h"
#include "search.h"
const int MAX_THREADS = 128;
const int MAX_SPLITPOINTS_PER_THREAD = 8;
struct Mutex {
Mutex() { lock_init(l); }
~Mutex() { lock_destroy(l); }
void lock() { lock_grab(l); }
void unlock() { lock_release(l); }
private:
friend struct ConditionVariable;
Lock l;
};
struct ConditionVariable {
ConditionVariable() { cond_init(c); }
~ConditionVariable() { cond_destroy(c); }
void wait(Mutex& m) { cond_wait(c, m.l); }
void wait_for(Mutex& m, int ms) { timed_wait(c, m.l, ms); }
void notify_one() { cond_signal(c); }
private:
WaitCondition c;
};
struct Thread;
struct SplitPoint {
// Const data after split point has been setup
const Position* pos;
Search::Stack* ss;
Thread* masterThread;
Depth depth;
Value beta;
int nodeType;
bool cutNode;
// Const pointers to shared data
MovePicker* movePicker;
SplitPoint* parentSplitPoint;
// Shared data
Mutex mutex;
std::bitset<MAX_THREADS> slavesMask;
volatile bool allSlavesSearching;
volatile uint64_t nodes;
volatile Value alpha;
volatile Value bestValue;
volatile Move bestMove;
volatile int moveCount;
volatile bool cutoff;
};
/// ThreadBase struct is the base of the hierarchy from where we derive all the
/// specialized thread classes.
struct ThreadBase {
ThreadBase() : handle(NativeHandle()), exit(false) {}
virtual ~ThreadBase() {}
virtual void idle_loop() = 0;
void notify_one();
void wait_for(volatile const bool& b);
Mutex mutex;
ConditionVariable sleepCondition;
NativeHandle handle;
volatile bool exit;
};
/// Thread struct keeps together all the thread related stuff like locks, state
/// and especially split points. We also use per-thread pawn and material hash
/// tables so that once we get a pointer to an entry its life time is unlimited
/// and we don't have to care about someone changing the entry under our feet.
struct Thread : public ThreadBase {
Thread();
virtual void idle_loop();
bool cutoff_occurred() const;
bool available_to(const Thread* master) const;
void split(Position& pos, Search::Stack* ss, Value alpha, Value beta, Value* bestValue, Move* bestMove,
Depth depth, int moveCount, MovePicker* movePicker, int nodeType, bool cutNode);
SplitPoint splitPoints[MAX_SPLITPOINTS_PER_THREAD];
Material::Table materialTable;
Endgames endgames;
Pawns::Table pawnsTable;
Position* activePosition;
size_t idx;
int maxPly;
SplitPoint* volatile activeSplitPoint;
volatile int splitPointsSize;
volatile bool searching;
};
/// MainThread and TimerThread are derived classes used to characterize the two
/// special threads: the main one and the recurring timer.
struct MainThread : public Thread {
MainThread() : thinking(true) {} // Avoid a race with start_thinking()
virtual void idle_loop();
volatile bool thinking;
};
struct TimerThread : public ThreadBase {
TimerThread() : run(false) {}
virtual void idle_loop();
bool run;
static const int Resolution = 5; // msec between two check_time() calls
};
/// ThreadPool struct handles all the threads related stuff like init, starting,
/// parking and, most importantly, launching a slave thread at a split point.
/// All the access to shared thread data is done through this class.
struct ThreadPool : public std::vector<Thread*> {
void init(); // No c'tor and d'tor, threads rely on globals that should
void exit(); // be initialized and are valid during the whole thread lifetime.
MainThread* main() { return static_cast<MainThread*>((*this)[0]); }
void read_uci_options();
Thread* available_slave(const Thread* master) const;
void wait_for_think_finished();
void start_thinking(const Position&, const Search::LimitsType&, Search::StateStackPtr&);
Depth minimumSplitDepth;
Mutex mutex;
ConditionVariable sleepCondition;
TimerThread* timer;
};
extern ThreadPool Threads;
#endif // #ifndef THREAD_H_INCLUDED

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/*
Stockfish, a UCI chess playing engine derived from Glaurung 2.1
Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
Copyright (C) 2008-2014 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
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Stockfish is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <algorithm>
#include <cfloat>
#include <cmath>
#include "search.h"
#include "timeman.h"
#include "uci.h"
namespace {
enum TimeType { OptimumTime, MaxTime };
const int MoveHorizon = 50; // Plan time management at most this many moves ahead
const double MaxRatio = 7.0; // When in trouble, we can step over reserved time with this ratio
const double StealRatio = 0.33; // However we must not steal time from remaining moves over this ratio
// move_importance() is a skew-logistic function based on naive statistical
// analysis of "how many games are still undecided after n half-moves". Game
// is considered "undecided" as long as neither side has >275cp advantage.
// Data was extracted from CCRL game database with some simple filtering criteria.
double move_importance(int ply) {
const double XScale = 9.3;
const double XShift = 59.8;
const double Skew = 0.172;
return pow((1 + exp((ply - XShift) / XScale)), -Skew) + DBL_MIN; // Ensure non-zero
}
template<TimeType T>
int remaining(int myTime, int movesToGo, int ply, int slowMover)
{
const double TMaxRatio = (T == OptimumTime ? 1 : MaxRatio);
const double TStealRatio = (T == OptimumTime ? 0 : StealRatio);
double moveImportance = (move_importance(ply) * slowMover) / 100;
double otherMovesImportance = 0;
for (int i = 1; i < movesToGo; ++i)
otherMovesImportance += move_importance(ply + 2 * i);
double ratio1 = (TMaxRatio * moveImportance) / (TMaxRatio * moveImportance + otherMovesImportance);
double ratio2 = (moveImportance + TStealRatio * otherMovesImportance) / (moveImportance + otherMovesImportance);
return int(myTime * std::min(ratio1, ratio2)); // Intel C++ asks an explicit cast
}
} // namespace
/// init() is called at the beginning of the search and calculates the allowed
/// thinking time out of the time control and current game ply. We support four
/// different kinds of time controls, passed in 'limits':
///
/// inc == 0 && movestogo == 0 means: x basetime [sudden death!]
/// inc == 0 && movestogo != 0 means: x moves in y minutes
/// inc > 0 && movestogo == 0 means: x basetime + z increment
/// inc > 0 && movestogo != 0 means: x moves in y minutes + z increment
void TimeManager::init(const Search::LimitsType& limits, Color us, int ply)
{
int minThinkingTime = Options["Minimum Thinking Time"];
int moveOverhead = Options["Move Overhead"];
int slowMover = Options["Slow Mover"];
// Initialize unstablePvFactor to 1 and search times to maximum values
unstablePvFactor = 1;
optimumSearchTime = maximumSearchTime = std::max(limits.time[us], minThinkingTime);
const int MaxMTG = limits.movestogo ? std::min(limits.movestogo, MoveHorizon) : MoveHorizon;
// We calculate optimum time usage for different hypothetical "moves to go"-values
// and choose the minimum of calculated search time values. Usually the greatest
// hypMTG gives the minimum values.
for (int hypMTG = 1; hypMTG <= MaxMTG; ++hypMTG)
{
// Calculate thinking time for hypothetical "moves to go"-value
int hypMyTime = limits.time[us]
+ limits.inc[us] * (hypMTG - 1)
- moveOverhead * (2 + std::min(hypMTG, 40));
hypMyTime = std::max(hypMyTime, 0);
int t1 = minThinkingTime + remaining<OptimumTime>(hypMyTime, hypMTG, ply, slowMover);
int t2 = minThinkingTime + remaining<MaxTime >(hypMyTime, hypMTG, ply, slowMover);
optimumSearchTime = std::min(t1, optimumSearchTime);
maximumSearchTime = std::min(t2, maximumSearchTime);
}
if (Options["Ponder"])
optimumSearchTime += optimumSearchTime / 4;
optimumSearchTime = std::min(optimumSearchTime, maximumSearchTime);
}

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/*
Stockfish, a UCI chess playing engine derived from Glaurung 2.1
Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
Copyright (C) 2008-2014 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
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Stockfish is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef TIMEMAN_H_INCLUDED
#define TIMEMAN_H_INCLUDED
/// The TimeManager class computes the optimal time to think depending on the
/// maximum available time, the game move number and other parameters.
class TimeManager {
public:
void init(const Search::LimitsType& limits, Color us, int ply);
void pv_instability(double bestMoveChanges) { unstablePvFactor = 1 + bestMoveChanges; }
int available_time() const { return int(optimumSearchTime * unstablePvFactor * 0.71); }
int maximum_time() const { return maximumSearchTime; }
private:
int optimumSearchTime;
int maximumSearchTime;
double unstablePvFactor;
};
#endif // #ifndef TIMEMAN_H_INCLUDED

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/*
Stockfish, a UCI chess playing engine derived from Glaurung 2.1
Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
Copyright (C) 2008-2014 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
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Stockfish is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <cstring> // For std::memset
#include <iostream>
#include "bitboard.h"
#include "tt.h"
TranspositionTable TT; // Our global transposition table
/// TranspositionTable::resize() sets the size of the transposition table,
/// measured in megabytes. Transposition table consists of a power of 2 number
/// of clusters and each cluster consists of TTClusterSize number of TTEntry.
void TranspositionTable::resize(size_t mbSize) {
size_t newClusterCount = size_t(1) << msb((mbSize * 1024 * 1024) / sizeof(TTCluster));
if (newClusterCount == clusterCount)
return;
clusterCount = newClusterCount;
free(mem);
mem = calloc(clusterCount * sizeof(TTCluster) + CACHE_LINE_SIZE - 1, 1);
if (!mem)
{
std::cerr << "Failed to allocate " << mbSize
<< "MB for transposition table." << std::endl;
exit(EXIT_FAILURE);
}
table = (TTCluster*)((uintptr_t(mem) + CACHE_LINE_SIZE - 1) & ~(CACHE_LINE_SIZE - 1));
}
/// TranspositionTable::clear() overwrites the entire transposition table
/// with zeros. It is called whenever the table is resized, or when the
/// user asks the program to clear the table (from the UCI interface).
void TranspositionTable::clear() {
std::memset(table, 0, clusterCount * sizeof(TTCluster));
}
/// TranspositionTable::probe() looks up the current position in the transposition
/// table. It returns true and a pointer to the TTEntry if the position is found.
/// Otherwise, it returns false and a pointer to an empty or least valuable TTEntry
/// to be replaced later. A TTEntry t1 is considered to be more valuable than a
/// TTEntry t2 if t1 is from the current search and t2 is from a previous search,
/// or if the depth of t1 is bigger than the depth of t2.
TTEntry* TranspositionTable::probe(const Key key, bool& found) const {
TTEntry* const tte = first_entry(key);
const uint16_t key16 = key >> 48; // Use the high 16 bits as key inside the cluster
for (unsigned i = 0; i < TTClusterSize; ++i)
if (!tte[i].key16 || tte[i].key16 == key16)
{
if (tte[i].key16)
tte[i].genBound8 = uint8_t(generation8 | tte[i].bound()); // Refresh
return found = (bool)tte[i].key16, &tte[i];
}
// Find an entry to be replaced according to the replacement strategy
TTEntry* replace = tte;
for (unsigned i = 1; i < TTClusterSize; ++i)
if ( (( tte[i].genBound8 & 0xFC) == generation8 || tte[i].bound() == BOUND_EXACT)
- ((replace->genBound8 & 0xFC) == generation8)
- (tte[i].depth8 < replace->depth8) < 0)
replace = &tte[i];
return found = false, replace;
}

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/*
Stockfish, a UCI chess playing engine derived from Glaurung 2.1
Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
Copyright (C) 2008-2014 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
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Stockfish is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef TT_H_INCLUDED
#define TT_H_INCLUDED
#include "misc.h"
#include "types.h"
/// The TTEntry is the 10 bytes transposition table entry, defined as below:
///
/// key 16 bit
/// move 16 bit
/// value 16 bit
/// eval value 16 bit
/// generation 6 bit
/// bound type 2 bit
/// depth 8 bit
struct TTEntry {
Move move() const { return (Move )move16; }
Value value() const { return (Value)value16; }
Value eval_value() const { return (Value)evalValue; }
Depth depth() const { return (Depth)depth8; }
Bound bound() const { return (Bound)(genBound8 & 0x3); }
void save(Key k, Value v, Bound b, Depth d, Move m, Value ev, uint8_t g) {
if (m || (k >> 48) != key16) // Preserve any existing move for the same position
move16 = (uint16_t)m;
key16 = (uint16_t)(k >> 48);
value16 = (int16_t)v;
evalValue = (int16_t)ev;
genBound8 = (uint8_t)(g | b);
depth8 = (int8_t)d;
}
private:
friend class TranspositionTable;
uint16_t key16;
uint16_t move16;
int16_t value16;
int16_t evalValue;
uint8_t genBound8;
int8_t depth8;
};
/// TTCluster is a 32 bytes cluster of TT entries consisting of:
///
/// 3 x TTEntry (3 x 10 bytes)
/// padding (2 bytes)
static const unsigned TTClusterSize = 3;
struct TTCluster {
TTEntry entry[TTClusterSize];
char padding[2];
};
/// A TranspositionTable consists of a power of 2 number of clusters and each
/// cluster consists of TTClusterSize number of TTEntry. Each non-empty entry
/// contains information of exactly one position. The size of a cluster should
/// not be bigger than a cache line size. In case it is less, it should be padded
/// to guarantee always aligned accesses.
class TranspositionTable {
public:
~TranspositionTable() { free(mem); }
void new_search() { generation8 += 4; } // Lower 2 bits are used by Bound
uint8_t generation() const { return generation8; }
TTEntry* probe(const Key key, bool& found) const;
TTEntry* first_entry(const Key key) const;
void resize(size_t mbSize);
void clear();
private:
size_t clusterCount;
TTCluster* table;
void* mem;
uint8_t generation8; // Size must be not bigger than TTEntry::genBound8
};
extern TranspositionTable TT;
/// TranspositionTable::first_entry() returns a pointer to the first entry of
/// a cluster given a position. The lowest order bits of the key are used to
/// get the index of the cluster inside the table.
inline TTEntry* TranspositionTable::first_entry(const Key key) const {
return &table[(size_t)key & (clusterCount - 1)].entry[0];
}
#endif // #ifndef TT_H_INCLUDED

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/*
Stockfish, a UCI chess playing engine derived from Glaurung 2.1
Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
Copyright (C) 2008-2014 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
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Stockfish is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <iostream>
#include <sstream>
#include <string>
#include "evaluate.h"
#include "movegen.h"
#include "position.h"
#include "search.h"
#include "thread.h"
#include "tt.h"
#include "uci.h"
using namespace std;
extern void benchmark(const Position& pos, istream& is);
namespace {
// FEN string of the initial position, normal chess
const char* StartFEN = "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1";
// Stack to keep track of the position states along the setup moves (from the
// start position to the position just before the search starts). Needed by
// 'draw by repetition' detection.
Search::StateStackPtr SetupStates;
// position() is called when engine receives the "position" UCI command.
// The function sets up the position described in the given FEN string ("fen")
// or the starting position ("startpos") and then makes the moves given in the
// following move list ("moves").
void position(Position& pos, istringstream& is) {
Move m;
string token, fen;
is >> token;
if (token == "startpos")
{
fen = StartFEN;
is >> token; // Consume "moves" token if any
}
else if (token == "fen")
while (is >> token && token != "moves")
fen += token + " ";
else
return;
pos.set(fen, Options["UCI_Chess960"], Threads.main());
SetupStates = Search::StateStackPtr(new std::stack<StateInfo>());
// Parse move list (if any)
while (is >> token && (m = UCI::to_move(pos, token)) != MOVE_NONE)
{
SetupStates->push(StateInfo());
pos.do_move(m, SetupStates->top());
}
}
// setoption() is called when engine receives the "setoption" UCI command. The
// function updates the UCI option ("name") to the given value ("value").
void setoption(istringstream& is) {
string token, name, value;
is >> token; // Consume "name" token
// Read option name (can contain spaces)
while (is >> token && token != "value")
name += string(" ", !name.empty()) + token;
// Read option value (can contain spaces)
while (is >> token)
value += string(" ", !value.empty()) + token;
if (Options.count(name))
Options[name] = value;
else
sync_cout << "No such option: " << name << sync_endl;
}
// go() is called when engine receives the "go" UCI command. The function sets
// the thinking time and other parameters from the input string, then starts
// the search.
void go(const Position& pos, istringstream& is) {
Search::LimitsType limits;
string token;
while (is >> token)
if (token == "searchmoves")
while (is >> token)
limits.searchmoves.push_back(UCI::to_move(pos, token));
else if (token == "wtime") is >> limits.time[WHITE];
else if (token == "btime") is >> limits.time[BLACK];
else if (token == "winc") is >> limits.inc[WHITE];
else if (token == "binc") is >> limits.inc[BLACK];
else if (token == "movestogo") is >> limits.movestogo;
else if (token == "depth") is >> limits.depth;
else if (token == "nodes") is >> limits.nodes;
else if (token == "movetime") is >> limits.movetime;
else if (token == "mate") is >> limits.mate;
else if (token == "infinite") limits.infinite = true;
else if (token == "ponder") limits.ponder = true;
Threads.start_thinking(pos, limits, SetupStates);
}
} // namespace
/// UCI::loop() waits for a command from stdin, parses it and calls the appropriate
/// function. Also intercepts EOF from stdin to ensure gracefully exiting if the
/// GUI dies unexpectedly. When called with some command line arguments, e.g. to
/// run 'bench', once the command is executed the function returns immediately.
/// In addition to the UCI ones, also some additional debug commands are supported.
void UCI::loop(int argc, char* argv[]) {
Position pos(StartFEN, false, Threads.main()); // The root position
string token, cmd;
for (int i = 1; i < argc; ++i)
cmd += std::string(argv[i]) + " ";
do {
if (argc == 1 && !getline(cin, cmd)) // Block here waiting for input or EOF
cmd = "quit";
istringstream is(cmd);
token.clear(); // getline() could return empty or blank line
is >> skipws >> token;
// The GUI sends 'ponderhit' to tell us to ponder on the same move the
// opponent has played. In case Signals.stopOnPonderhit is set we are
// waiting for 'ponderhit' to stop the search (for instance because we
// already ran out of time), otherwise we should continue searching but
// switching from pondering to normal search.
if ( token == "quit"
|| token == "stop"
|| (token == "ponderhit" && Search::Signals.stopOnPonderhit))
{
Search::Signals.stop = true;
Threads.main()->notify_one(); // Could be sleeping
}
else if (token == "ponderhit")
Search::Limits.ponder = false; // Switch to normal search
else if (token == "uci")
sync_cout << "id name " << engine_info(true)
<< "\n" << Options
<< "\nuciok" << sync_endl;
else if (token == "isready") sync_cout << "readyok" << sync_endl;
else if (token == "ucinewgame") TT.clear();
else if (token == "go") go(pos, is);
else if (token == "position") position(pos, is);
else if (token == "setoption") setoption(is);
// Additional custom non-UCI commands, useful for debugging
else if (token == "flip") pos.flip();
else if (token == "bench") benchmark(pos, is);
else if (token == "d") sync_cout << pos << sync_endl;
else if (token == "eval") sync_cout << Eval::trace(pos) << sync_endl;
else if (token == "perft")
{
int depth;
stringstream ss;
is >> depth;
ss << Options["Hash"] << " "
<< Options["Threads"] << " " << depth << " current perft";
benchmark(pos, ss);
}
else
sync_cout << "Unknown command: " << cmd << sync_endl;
} while (token != "quit" && argc == 1); // Passed args have one-shot behaviour
Threads.wait_for_think_finished(); // Cannot quit whilst the search is running
}
/// UCI::value() converts a Value to a string suitable for use with the UCI
/// protocol specification:
///
/// cp <x> The score from the engine's point of view in centipawns.
/// mate <y> Mate in y moves, not plies. If the engine is getting mated
/// use negative values for y.
string UCI::value(Value v) {
stringstream ss;
if (abs(v) < VALUE_MATE - MAX_PLY)
ss << "cp " << v * 100 / PawnValueEg;
else
ss << "mate " << (v > 0 ? VALUE_MATE - v + 1 : -VALUE_MATE - v) / 2;
return ss.str();
}
/// UCI::square() converts a Square to a string in algebraic notation (g1, a7, etc.)
std::string UCI::square(Square s) {
char sq[] = { char('a' + file_of(s)), char('1' + rank_of(s)), 0 }; // NULL terminated
return sq;
}
/// UCI::move() converts a Move to a string in coordinate notation (g1f3, a7a8q).
/// The only special case is castling, where we print in the e1g1 notation in
/// normal chess mode, and in e1h1 notation in chess960 mode. Internally all
/// castling moves are always encoded as 'king captures rook'.
string UCI::move(Move m, bool chess960) {
Square from = from_sq(m);
Square to = to_sq(m);
if (m == MOVE_NONE)
return "(none)";
if (m == MOVE_NULL)
return "0000";
if (type_of(m) == CASTLING && !chess960)
to = make_square(to > from ? FILE_G : FILE_C, rank_of(from));
string move = UCI::square(from) + UCI::square(to);
if (type_of(m) == PROMOTION)
move += " pnbrqk"[promotion_type(m)];
return move;
}
/// UCI::to_move() converts a string representing a move in coordinate notation
/// (g1f3, a7a8q) to the corresponding legal Move, if any.
Move UCI::to_move(const Position& pos, string& str) {
if (str.length() == 5) // Junior could send promotion piece in uppercase
str[4] = char(tolower(str[4]));
for (MoveList<LEGAL> it(pos); *it; ++it)
if (str == UCI::move(*it, pos.is_chess960()))
return *it;
return MOVE_NONE;
}

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/*
Stockfish, a UCI chess playing engine derived from Glaurung 2.1
Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
Copyright (C) 2008-2014 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
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Stockfish is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef UCIOPTION_H_INCLUDED
#define UCIOPTION_H_INCLUDED
#include <map>
#include <string>
#include "types.h"
class Position;
namespace UCI {
class Option;
/// Custom comparator because UCI options should be case insensitive
struct CaseInsensitiveLess {
bool operator() (const std::string&, const std::string&) const;
};
/// Our options container is actually a std::map
typedef std::map<std::string, Option, CaseInsensitiveLess> OptionsMap;
/// Option class implements an option as defined by UCI protocol
class Option {
typedef void (*OnChange)(const Option&);
public:
Option(OnChange = NULL);
Option(bool v, OnChange = NULL);
Option(const char* v, OnChange = NULL);
Option(int v, int min, int max, OnChange = NULL);
Option& operator=(const std::string& v);
void operator<<(const Option& o);
operator int() const;
operator std::string() const;
private:
friend std::ostream& operator<<(std::ostream&, const OptionsMap&);
std::string defaultValue, currentValue, type;
int min, max;
size_t idx;
OnChange on_change;
};
void init(OptionsMap&);
void loop(int argc, char* argv[]);
std::string value(Value v);
std::string square(Square s);
std::string move(Move m, bool chess960);
Move to_move(const Position& pos, std::string& str);
} // namespace UCI
extern UCI::OptionsMap Options;
#endif // #ifndef UCIOPTION_H_INCLUDED

160
src/ucioption.cpp
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@ -1,160 +0,0 @@
/*
Stockfish, a UCI chess playing engine derived from Glaurung 2.1
Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
Copyright (C) 2008-2014 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
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Stockfish is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <algorithm>
#include <cassert>
#include <cstdlib>
#include <sstream>
#include "misc.h"
#include "thread.h"
#include "tt.h"
#include "uci.h"
#include "syzygy/tbprobe.h"
using std::string;
UCI::OptionsMap Options; // Global object
namespace UCI {
/// 'On change' actions, triggered by an option's value change
void on_clear_hash(const Option&) { TT.clear(); }
void on_hash_size(const Option& o) { TT.resize(o); }
void on_logger(const Option& o) { start_logger(o); }
void on_threads(const Option&) { Threads.read_uci_options(); }
void on_tb_path(const Option& o) { Tablebases::init(o); }
/// Our case insensitive less() function as required by UCI protocol
bool ci_less(char c1, char c2) { return tolower(c1) < tolower(c2); }
bool CaseInsensitiveLess::operator() (const string& s1, const string& s2) const {
return std::lexicographical_compare(s1.begin(), s1.end(), s2.begin(), s2.end(), ci_less);
}
/// init() initializes the UCI options to their hard-coded default values
void init(OptionsMap& o) {
o["Write Debug Log"] << Option(false, on_logger);
o["Contempt"] << Option(0, -100, 100);
o["Min Split Depth"] << Option(0, 0, 12, on_threads);
o["Threads"] << Option(1, 1, MAX_THREADS, on_threads);
o["Hash"] << Option(16, 1, 1024 * 1024, on_hash_size);
o["Clear Hash"] << Option(on_clear_hash);
o["Ponder"] << Option(true);
o["MultiPV"] << Option(1, 1, 500);
o["Skill Level"] << Option(20, 0, 20);
o["Move Overhead"] << Option(30, 0, 5000);
o["Minimum Thinking Time"] << Option(20, 0, 5000);
o["Slow Mover"] << Option(80, 10, 1000);
o["UCI_Chess960"] << Option(false);
o["SyzygyPath"] << Option("<empty>", on_tb_path);
o["SyzygyProbeDepth"] << Option(1, 1, 100);
o["Syzygy50MoveRule"] << Option(true);
o["SyzygyProbeLimit"] << Option(6, 0, 6);
}
/// operator<<() is used to print all the options default values in chronological
/// insertion order (the idx field) and in the format defined by the UCI protocol.
std::ostream& operator<<(std::ostream& os, const OptionsMap& om) {
for (size_t idx = 0; idx < om.size(); ++idx)
for (OptionsMap::const_iterator it = om.begin(); it != om.end(); ++it)
if (it->second.idx == idx)
{
const Option& o = it->second;
os << "\noption name " << it->first << " type " << o.type;
if (o.type != "button")
os << " default " << o.defaultValue;
if (o.type == "spin")
os << " min " << o.min << " max " << o.max;
break;
}
return os;
}
/// Option class constructors and conversion operators
Option::Option(const char* v, OnChange f) : type("string"), min(0), max(0), on_change(f)
{ defaultValue = currentValue = v; }
Option::Option(bool v, OnChange f) : type("check"), min(0), max(0), on_change(f)
{ defaultValue = currentValue = (v ? "true" : "false"); }
Option::Option(OnChange f) : type("button"), min(0), max(0), on_change(f)
{}
Option::Option(int v, int minv, int maxv, OnChange f) : type("spin"), min(minv), max(maxv), on_change(f)
{ std::ostringstream ss; ss << v; defaultValue = currentValue = ss.str(); }
Option::operator int() const {
assert(type == "check" || type == "spin");
return (type == "spin" ? atoi(currentValue.c_str()) : currentValue == "true");
}
Option::operator std::string() const {
assert(type == "string");
return currentValue;
}
/// operator<<() inits options and assigns idx in the correct printing order
void Option::operator<<(const Option& o) {
static size_t insert_order = 0;
*this = o;
idx = insert_order++;
}
/// operator=() updates currentValue and triggers on_change() action. It's up to
/// the GUI to check for option's limits, but we could receive the new value from
/// the user by console window, so let's check the bounds anyway.
Option& Option::operator=(const string& v) {
assert(!type.empty());
if ( (type != "button" && v.empty())
|| (type == "check" && v != "true" && v != "false")
|| (type == "spin" && (atoi(v.c_str()) < min || atoi(v.c_str()) > max)))
return *this;
if (type != "button")
currentValue = v;
if (on_change)
on_change(*this);
return *this;
}
} // namespace UCI