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/*
* 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.
*/
#ifndef PAS_FAST_MEGAPAGE_TABLE_H
#define PAS_FAST_MEGAPAGE_TABLE_H
#include "pas_bitfield_vector.h"
#include "pas_bitvector.h"
#include "pas_fast_megapage_kind.h"
#include "pas_internal_config.h"
#include "pas_heap_lock.h"
#include "pas_immortal_heap.h"
#include "pas_lock.h"
#include <stdio.h>
PAS_BEGIN_EXTERN_C;
#define PAS_NUM_FAST_MEGAPAGE_TABLES \
(PAS_NUM_STATIC_FAST_MEGAPAGE_TABLES + PAS_USE_DYNAMIC_FAST_MEGAPAGE_TABLE)
#define PAS_DYNAMIC_FAST_MEGAPAGE_TABLE_INDEX PAS_NUM_STATIC_FAST_MEGAPAGE_TABLES
#define PAS_FAST_MEGAPAGE_TABLE_NUM_BITS 2
struct pas_fast_megapage_table;
struct pas_fast_megapage_table_impl;
typedef struct pas_fast_megapage_table pas_fast_megapage_table;
typedef struct pas_fast_megapage_table_impl pas_fast_megapage_table_impl;
struct pas_fast_megapage_table_impl {
size_t index_begin; /* inclusive */
size_t index_end; /* exclusive */
pas_fast_megapage_table_impl* last; /* this is just to prevent `leaks` from complaining */
unsigned bits[1];
};
struct pas_fast_megapage_table {
unsigned fast_bits[PAS_BITVECTOR_NUM_WORDS(PAS_NUM_FAST_FAST_MEGAPAGE_BITS)];
pas_fast_megapage_table_impl* instances[PAS_NUM_FAST_MEGAPAGE_TABLES];
};
PAS_API extern pas_fast_megapage_table_impl pas_fast_megapage_table_impl_null;
#define PAS_FAST_MEGAPAGE_TABLE_INITIALIZER \
{ \
.fast_bits = {[0 ... PAS_BITVECTOR_NUM_WORDS(PAS_NUM_FAST_FAST_MEGAPAGE_BITS) - 1] = 0}, \
.instances = {[0 ... PAS_NUM_FAST_MEGAPAGE_TABLES - 1] = &pas_fast_megapage_table_impl_null} \
}
PAS_API void pas_fast_megapage_table_initialize_static_by_index(
pas_fast_megapage_table* table,
size_t index, uintptr_t begin, uintptr_t end,
pas_lock_hold_mode heap_lock_hold_mode);
PAS_API void pas_fast_megapage_table_initialize_static(
pas_fast_megapage_table* table,
size_t index, uintptr_t begin, uintptr_t end,
pas_lock_hold_mode heap_lock_hold_mode);
PAS_API void pas_fast_megapage_table_set_by_index(
pas_fast_megapage_table* table,
size_t index, pas_fast_megapage_kind value,
pas_lock_hold_mode heap_lock_hold_mode);
static inline pas_fast_megapage_kind pas_fast_megapage_table_get_by_index(
pas_fast_megapage_table* table,
size_t index)
{
pas_fast_megapage_table_impl* instance;
size_t index_begin;
size_t table_index;
if (PAS_LIKELY(index < PAS_NUM_FAST_FAST_MEGAPAGE_BITS)
&& PAS_LIKELY(pas_bitvector_get(table->fast_bits, index)))
return pas_small_segregated_fast_megapage_kind;
for (table_index = 0; table_index < PAS_NUM_FAST_MEGAPAGE_TABLES; ++table_index) {
instance = table->instances[table_index];
index_begin = instance->index_begin;
if (PAS_UNLIKELY(index < index_begin))
continue;
if (PAS_UNLIKELY(index >= instance->index_end))
continue;
return (pas_fast_megapage_kind)pas_bitfield_vector_get(
instance->bits, PAS_FAST_MEGAPAGE_TABLE_NUM_BITS, index - index_begin);
}
return pas_not_a_fast_megapage_kind;
}
static inline pas_fast_megapage_kind pas_fast_megapage_table_get(
pas_fast_megapage_table* table,
uintptr_t begin)
{
return pas_fast_megapage_table_get_by_index(table, begin >> PAS_FAST_MEGAPAGE_SHIFT);
}
PAS_END_EXTERN_C;
#endif /* PAS_FAST_MEGAPAGE_TABLE_H */