Question

我正在用C语言编写一个国际象棋引擎并通过Valgrind运行它并获得了这个：

==20217== 672 (32 direct, 640 indirect) bytes in 1 blocks are definitely lost in loss record 39 of  98
==20217==    at 0x4C2B6CD: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==20217==    by 0x40143A: register_move (Chess.c:236)
==20217==    by 0x4015B6: scan_in_direction (Chess.c:256)
==20217==    by 0x402131: getBishopMoves (Chess.c:374)
==20217==    by 0x401296: getSquareMoves (Chess.c:190)
==20217==    by 0x400C94: getAllMoves (Chess.c:60)
==20217==    by 0x405C19: alphaBetaMax (MiniMax.c:260)
==20217==    by 0x405D02: alphaBetaMax (MiniMax.c:274)
==20217==    by 0x405D02: alphaBetaMax (MiniMax.c:274)
==20217==    by 0x405D02: alphaBetaMax (MiniMax.c:274)
==20217==    by 0x405ECD: getBestMove (MiniMax.c:307)
==20217==    by 0x403933: computerTurn (Chess.c:850)

函数register_move是：

static void register_move(game_t game, int x1, int y1, int x2, int y2, char special,
          int color) {
    move_t *tmpMove = (move_t *)malloc(sizeof(move_t));
    checkMalloc(tmpMove);
    tmpMove->x1 = x1;
    tmpMove->y1 = y1;
    tmpMove->x2 = x2;
    tmpMove->y2 = y2;
    tmpMove->s = special;
    firstMove = addToList(game, firstMove, tmpMove, color); //firstMove is a global list of moves
}

编辑：为了进一步明确，move_t定义为：

struct move_t {
    int x1;
    int y1;
    int x2;
    int y2;
    char s;
    struct move_t *next;
};

typedef struct move_t move_t;

更多编辑： firstMove是一个全局移动列表。上面引用的函数addToList是：

move_t *addToList(game_t game, move_t *list, move_t *move, int color) {
    int kx, ky;
    game_t copy;
    copyGame(game, &copy);
    makeMove(&copy, *move);

    kx = copy.data[2];
    ky = copy.data[3];
    if (color) {
        kx = copy.data[0];
        ky = copy.data[1];
    }
    if (isAttacked(&copy, kx, ky, color) == 0) {
        move->next = list;
        list = move;
    } else {
        free(move);
    }
    freeGame(copy);
    return list;
}

如果潜在的举动是非法的，即curplayer的国王正在检查中，则移动不会被添加到列表中而是被释放。问题可能在于释放firstMove，这在整个程序中都会发生。

为什么Valgrind认为malloc似乎存在问题？对我来说似乎没问题。我怎么解释这个？

Valgrind的错误信息不明确

0 个答案: