Source/bmalloc/libpas/src/libpas/pas_bitfit_size_class.h

/*
 * Copyright (c) 2020 Apple Inc. 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 APPLE INC. ``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 APPLE INC. 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
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 */

#ifndef PAS_BITFIT_SIZE_CLASS_H
#define PAS_BITFIT_SIZE_CLASS_H

#include "pas_compact_atomic_bitfit_size_class_ptr.h"
#include "pas_compact_bitfit_directory_ptr.h"
#include "pas_utils.h"
#include "pas_versioned_field.h"

PAS_BEGIN_EXTERN_C;

struct pas_bitfit_size_class;
struct pas_bitfit_page_config;
struct pas_bitfit_size_class;
struct pas_bitfit_view;
typedef struct pas_bitfit_size_class pas_bitfit_size_class;
typedef struct pas_bitfit_page_config pas_bitfit_page_config;
typedef struct pas_bitfit_size_class pas_bitfit_size_class;
typedef struct pas_bitfit_view pas_bitfit_view;

struct PAS_ALIGNED(sizeof(pas_versioned_field)) pas_bitfit_size_class {
    pas_versioned_field first_free;
    unsigned size;
    pas_compact_atomic_bitfit_size_class_ptr next_smaller;
    pas_compact_bitfit_directory_ptr directory;
};

PAS_API pas_compact_atomic_bitfit_size_class_ptr*
pas_bitfit_size_class_find_insertion_point(pas_bitfit_directory* directory,
                                           unsigned size);

PAS_API void pas_bitfit_size_class_construct(
    pas_bitfit_size_class* size_class,
    unsigned size,
    pas_bitfit_directory* directory,
    pas_compact_atomic_bitfit_size_class_ptr* insertion_point);

PAS_API pas_bitfit_size_class* pas_bitfit_size_class_create(
    unsigned size,
    pas_bitfit_directory* directory,
    pas_compact_atomic_bitfit_size_class_ptr* insertion_point);

PAS_API pas_bitfit_view*
pas_bitfit_size_class_get_first_free_view(pas_bitfit_size_class* size_class,
                                          pas_bitfit_page_config* page_config);

PAS_END_EXTERN_C;

#endif /* PAS_BITFIT_SIZE_CLASS_H */