/*
 * Copyright (c) 2021 Huawei Device Co., Ltd.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "pool_map.h"

namespace panda {

void PoolMap::AddPoolToMap(const void *pool_addr, size_t pool_size, SpaceType space_type, AllocatorType allocator_type,
                           const void *allocator_addr)
{
    ASSERT(ToUintPtr(pool_addr) % POOL_MAP_GRANULARITY == 0);
    ASSERT(pool_size % POOL_MAP_GRANULARITY == 0);
    ASSERT(allocator_addr != nullptr);
    size_t first_map_num = AddrToMapNum(pool_addr);
    size_t last_map_num = AddrToMapNum(ToVoidPtr(ToUintPtr(pool_addr) + pool_size - 1U));
    pool_map_[first_map_num].Initialize(FIRST_BYTE_IN_SEGMENT_VALUE, space_type, allocator_type, allocator_addr);
    for (size_t i = first_map_num + 1U; i <= last_map_num; i++) {
        pool_map_[i].Initialize(!FIRST_BYTE_IN_SEGMENT_VALUE, space_type, allocator_type, allocator_addr);
    }
}

void PoolMap::RemovePoolFromMap(void *pool_addr, size_t pool_size)
{
    ASSERT(ToUintPtr(pool_addr) % POOL_MAP_GRANULARITY == 0);
    ASSERT(pool_size % POOL_MAP_GRANULARITY == 0);
    size_t first_map_num = AddrToMapNum(pool_addr);
    size_t last_map_num = AddrToMapNum(ToVoidPtr(ToUintPtr(pool_addr) + pool_size - 1U));
    for (size_t i = first_map_num; i <= last_map_num; i++) {
        pool_map_[i].Destroy();
    }
}

AllocatorInfo PoolMap::GetAllocatorInfo(const void *addr) const
{
    size_t map_num = AddrToMapNum(addr);
    AllocatorType allocator_type = pool_map_[map_num].GetAllocatorType();
    const void *allocator_addr = pool_map_[map_num].GetAllocatorAddr();
    // We can't get allocator info for not properly initialized pools
    ASSERT(allocator_type != AllocatorType::UNDEFINED);
    ASSERT(allocator_addr != nullptr);
    return AllocatorInfo(allocator_type, allocator_addr);
}

SpaceType PoolMap::GetSpaceType(const void *addr) const
{
    if (ToUintPtr(addr) > (POOL_MAP_COVERAGE - 1U)) {
        return SpaceType::SPACE_TYPE_UNDEFINED;
    }
    size_t map_num = AddrToMapNum(addr);
    SpaceType space_type = pool_map_[map_num].GetSpaceType();
    // We can't get space type for not properly initialized pools
    ASSERT(space_type != SpaceType::SPACE_TYPE_UNDEFINED);
    return space_type;
}

void *PoolMap::GetFirstByteOfPoolForAddr(const void *addr)
{
    return GetFirstByteInSegment(addr);
}

void *PoolMap::GetFirstByteInSegment(const void *addr)
{
    size_t current_map_num = AddrToMapNum(addr);
    while (!pool_map_[current_map_num].IsFirstByteInSegment()) {
        ASSERT(current_map_num != 0);
        current_map_num--;
    }
    return MapNumToAddr(current_map_num);
}

}  // namespace panda