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protect hash_init() against multiple calls

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Bruno Raoult
2024-05-21 07:49:49 +02:00
parent 77695574aa
commit 07a545adae
1 changed files with 18 additions and 13 deletions
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31
src/hash.c
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@@ -32,21 +32,26 @@ hasht_t hash_tt; /* main transposition table */
/**
* zobrist_init() - initialize zobrist tables.
*
* Initialize all zobrist random bitmasks.
* Initialize all zobrist random bitmasks. Must be called before any other
* zobrist function, and can be called once only (further calls will be ignored).
*/
void zobrist_init(void)
{
for (color_t c = WHITE; c <= BLACK; ++c) {
for (piece_type_t p = PAWN; p <= KING; ++p)
for (square_t sq = A1; sq <= H8; ++sq)
zobrist_pieces[MAKE_PIECE(p, c)][sq] = rand64();
static bool called = false;
if (!called) {
called = true;
for (color_t c = WHITE; c <= BLACK; ++c) {
for (piece_type_t p = PAWN; p <= KING; ++p)
for (square_t sq = A1; sq <= H8; ++sq)
zobrist_pieces[MAKE_PIECE(p, c)][sq] = rand64();
}
for (castle_rights_t c = CASTLE_NONE; c <= CASTLE_ALL; ++c)
zobrist_castling[c] = rand64();
for (file_t f = FILE_A; f <= FILE_H; ++f)
zobrist_ep[f] = rand64();
zobrist_ep[8] = 0; /* see EP_ZOBRIST_IDX macro */
zobrist_turn = rand64();
}
for (castle_rights_t c = CASTLE_NONE; c <= CASTLE_ALL; ++c)
zobrist_castling[c] = rand64();
for (file_t f = FILE_A; f <= FILE_H; ++f)
zobrist_ep[f] = rand64();
zobrist_ep[8] = 0;
zobrist_turn = rand64();
}
/**
@@ -89,7 +94,7 @@ key_t zobrist_calc(pos_t *pos)
* @pos: &position
*
* Verify that position Zobrist key matches a full Zobrist calculation.
* This function cannot be called if DEBUG_HASH is not set.
* This function cannot be called if ZOBRIST_VERIFY is not set.
*
* @return: True if Zobrist key is OK.
*/
@@ -132,7 +137,7 @@ bool zobrist_verify(pos_t *pos)
}
warn(true, "zobrist diff %lx is unknown\n", diff);
end:
return false;
bug_on(false);
}
#endif