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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 2021 Mike Becker, Olaf Wintermann All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *   1. Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *
 *   2. Redistributions in binary form must reproduce the above copyright
 *      notice, this list of conditions and the following disclaimer in the
 *      documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef UCX_UTIL_ALLOCATOR_H
#define UCX_UTIL_ALLOCATOR_H

#include "cx/allocator.h"

#include <set>

struct CxTestingAllocator : public CxAllocator {
    /**
     * Total number of all allocations (malloc, calloc, realloc).
     * A realloc() does only count when the memory has to be moved.
     */
    unsigned alloc_total = 0;
    /**
     * Number of failed allocations (malloc, calloc, realloc).
     */
    unsigned alloc_failed = 0;
    /**
     * Total number of freed pointers.
     * A reallocation also counts as a free when the memory has to be moved.
     */
    unsigned free_total = 0;
    /**
     * Number of failed free invocations.
     * A free() is considered failed, if it has not been performed on tracked memory.
     */
    unsigned free_failed = 0;
    /**
     * The set of tracked memory blocks.
     */
    std::set<void *> tracked;

    /**
     * Constructs a new testing allocator.
     */
    CxTestingAllocator();

    /**
     * Verifies that this allocator has been used.
     *
     * @return true if any allocation was attempted using this allocator
     */
    [[nodiscard]] bool used() const;

    /**
     * Verifies that all allocated memory blocks are freed and no free occurred twice.
     *
     * @return true iff all tracked allocations / deallocations were valid
     */
    [[nodiscard]] bool verify() const;
};

#endif /* UCX_UTIL_ALLOCATOR_H */