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/*
** Copyright (c) 2020 LunarG, Inc.
**
** Permission is hereby granted, free of charge, to any person obtaining a
** copy of this software and associated documentation files (the "Software"),
** to deal in the Software without restriction, including without limitation
** the rights to use, copy, modify, merge, publish, distribute, sublicense,
** and/or sell copies of the Software, and to permit persons to whom the
** Software is furnished to do so, subject to the following conditions:
**
** The above copyright notice and this permission notice shall be included in
** all copies or substantial portions of the Software.
**
** THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
** IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
** FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
** AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
** LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
** FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
** DEALINGS IN THE SOFTWARE.
*/
#include "util/monotonic_allocator.h"
GFXRECON_BEGIN_NAMESPACE(gfxrecon)
GFXRECON_BEGIN_NAMESPACE(util)
void MonotonicAllocator::Clear(bool free_system_memory)
{
// Call destructors of allocated objects
for (auto destructor : destructors_)
{
destructor.destroy(destructor.obj);
}
destructors_.clear();
// Free memory blocks
if (free_system_memory)
{
memory_blocks_.clear();
}
// Free oversized allocations
oversized_allocations_.clear();
current_block_ = 0;
current_block_free_bytes_ = block_size_;
}
void* MonotonicAllocator::Allocate(size_t object_bytes, size_t alignment_bytes)
{
void* result = nullptr;
// Don't allocate 0 bytes
assert(object_bytes + alignment_bytes > 0);
if (object_bytes + alignment_bytes == 0)
{
return nullptr;
}
if (object_bytes <= block_size_)
{
// Try to allocate to an existing block
while (current_block_ < memory_blocks_.size() && result == nullptr)
{
result = AllocateToBlock(object_bytes, alignment_bytes);
if (result == nullptr)
{
// Move to next block
++current_block_;
current_block_free_bytes_ = block_size_;
}
}
if (result == nullptr)
{
memory_blocks_.emplace_back(new unsigned char[block_size_]);
result = AllocateToBlock(object_bytes, alignment_bytes);
}
}
else
{
// Custom allocation
oversized_allocations_.emplace_back(new unsigned char[object_bytes]);
result = oversized_allocations_.back().get();
}
return result;
}
void* MonotonicAllocator::AllocateToBlock(size_t object_bytes, size_t alignment_bytes)
{
void* block_ptr =
reinterpret_cast<void*>(memory_blocks_[current_block_].get() + block_size_ - current_block_free_bytes_);
void* result = std::align(alignment_bytes, object_bytes, block_ptr, current_block_free_bytes_);
if (result != nullptr)
{
current_block_free_bytes_ -= object_bytes;
}
return result;
}
GFXRECON_END_NAMESPACE(util)
GFXRECON_END_NAMESPACE(gfxrecon)
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