Source/bmalloc/libpas/src/libpas/pas_fast_megapage_cache.c

/*
 * Copyright (c) 2018-2020 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
 * 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. 
 */

#include "pas_config.h"

#if LIBPAS_ENABLED

#include "pas_fast_megapage_cache.h"

#include "pas_config.h"
#include "pas_fast_megapage_table.h"
#include "pas_heap_config.h"
#include "pas_megapage_cache.h"
#include "pas_page_base.h"

typedef struct {
    pas_fast_megapage_table* table;
    pas_fast_megapage_kind kind;
} table_set_by_index_data;

static void table_set_by_index(size_t index, void* arg)
{
    table_set_by_index_data* data;
    
    data = arg;
    
    PAS_ASSERT(pas_fast_megapage_table_get_by_index(data->table, index)
               == pas_not_a_fast_megapage_kind);
    pas_fast_megapage_table_set_by_index(data->table,
                                         index,
                                         data->kind,
                                         pas_lock_is_held);
    PAS_ASSERT(pas_fast_megapage_table_get_by_index(data->table, index)
               == data->kind);
}

void* pas_fast_megapage_cache_try_allocate(
    pas_megapage_cache* cache,
    pas_fast_megapage_table* table,
    pas_page_base_config* config,
    pas_fast_megapage_kind kind,
    bool should_zero,
    pas_heap* heap,
    pas_physical_memory_transaction* transaction)
{
    pas_megapage_cache_config cache_config;
    table_set_by_index_data data;
    
    data.table = table;
    data.kind = kind;

    cache_config.megapage_size = PAS_FAST_MEGAPAGE_SIZE;
    cache_config.allocation_size = config->page_size;
    cache_config.allocation_alignment =
        pas_alignment_create_traditional(cache_config.allocation_size);
    cache_config.excluded_size = 0;
    cache_config.table_set_by_index = table_set_by_index;
    cache_config.table_set_by_index_arg = &data;
    cache_config.should_zero = should_zero;
    
    return pas_megapage_cache_try_allocate(cache, &cache_config, heap, transaction);
}

#endif /* LIBPAS_ENABLED */