| /* |
| * 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 */ |
| |