Source/bmalloc/libpas/src/libpas/pas_utility_heap.h

/*
 * Copyright (c) 2018-2019 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_UTILITY_HEAP_H
#define PAS_UTILITY_HEAP_H

#include "pas_allocation_kind.h"
#include "pas_intrinsic_heap_support.h"
#include "pas_allocator_counts.h"
#include "pas_lock.h"
#include "pas_segregated_heap.h"
#include "pas_utility_heap_support.h"
#include "pas_utils.h"

PAS_BEGIN_EXTERN_C;

struct pas_segregated_heap;
struct pas_segregated_page;
struct pas_segregated_size_directory;
typedef struct pas_segregated_heap pas_segregated_heap;
typedef struct pas_segregated_page pas_segregated_page;
typedef struct pas_segregated_size_directory pas_segregated_size_directory;

/* The utility heap is for allocating high volumes of small objects as part of bookkeeping for
   the heaps that libpas actually provides. It can only handle objects up to some size (roughly
   PAS_UTILITY_LOOKUP_SIZE_UPPER_BOUND, but not exactly - the math gets discretized). You have
   to hold the heap lock to allocate and deallocate in it. */

PAS_API extern pas_utility_heap_support pas_utility_heap_support_instance;
PAS_API extern pas_heap_runtime_config pas_utility_heap_runtime_config;
PAS_API extern pas_segregated_heap pas_utility_segregated_heap;
PAS_API extern pas_allocator_counts pas_utility_allocator_counts;

PAS_API void* pas_utility_heap_try_allocate(size_t size, const char* name);
PAS_API void* pas_utility_heap_allocate(size_t size, const char* name);

static inline void* pas_utility_heap_allocate_with_asserted_kind(
    size_t size, const char* name, pas_allocation_kind allocation_kind)
{
    PAS_ASSERT(allocation_kind == pas_object_allocation);
    return pas_utility_heap_allocate(size, name);
}

PAS_API void* pas_utility_heap_try_allocate_with_alignment(
    size_t size,
    size_t alignment,
    const char* name);
PAS_API void* pas_utility_heap_allocate_with_alignment(
    size_t size,
    size_t alignment,
    const char* name);

PAS_API void pas_utility_heap_deallocate(void* ptr);

static inline void pas_utility_heap_deallocate_with_ignored_size_and_asserted_kind(
    void* ptr, size_t size, pas_allocation_kind kind)
{
    PAS_ASSERT(kind == pas_object_allocation);
    PAS_UNUSED_PARAM(size);
    pas_utility_heap_deallocate(ptr);
}

PAS_API size_t pas_utility_heap_get_num_free_bytes(void); /* Gotta hold the heap lock. */

typedef bool (*pas_utility_heap_for_each_live_object_callback)(
    uintptr_t begin,
    size_t size,
    void* arg);

PAS_API bool pas_utility_heap_for_each_live_object(
    pas_utility_heap_for_each_live_object_callback callback,
    void* arg);

PAS_API bool pas_utility_heap_for_all_allocators(pas_allocator_scavenge_action action,
                                                 pas_lock_hold_mode heap_lock_hold_mode);

PAS_END_EXTERN_C;

#endif /* PAS_UTILITY_HEAP_H */