glslmemorypool.cpp

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// Copyright (C) 2021 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
 
#include "glslmemorypool_p.h"
#include <cstring>
#include <cassert>
#include <cstdlib>
 
QT_BEGIN_NAMESPACE
 
using namespace GLSL;
 
MemoryPool::MemoryPool()
    : _blocks(nullptr),
      _allocatedBlocks(0),
      _blockCount(-1),
      _ptr(nullptr),
      _end(nullptr)
{ }
 
MemoryPool::~MemoryPool()
{
    if (_blocks) {
        for (int i = 0; i < _allocatedBlocks; ++i) {
            if (char *b = _blocks[i])
                std::free(b);
        }
 
        std::free(_blocks);
    }
}
 
void MemoryPool::reset()
{
    _blockCount = -1;
    _ptr = _end = nullptr;
}
 
void *MemoryPool::allocate_helper(size_t size)
{
    assert(size < BLOCK_SIZE);
 
    if (++_blockCount == _allocatedBlocks) {
        if (! _allocatedBlocks)
            _allocatedBlocks = DEFAULT_BLOCK_COUNT;
        else
            _allocatedBlocks *= 2;
 
        _blocks = (char **) realloc(_blocks, sizeof(char *) * _allocatedBlocks);
 
        for (int index = _blockCount; index < _allocatedBlocks; ++index)
            _blocks[index] = nullptr;
    }
 
    char *&block = _blocks[_blockCount];
 
    if (! block)
        block = (char *) std::malloc(BLOCK_SIZE);
 
    _ptr = block;
    _end = _ptr + BLOCK_SIZE;
 
    void *addr = _ptr;
    _ptr += size;
    return addr;
}
 
Managed::Managed()
{ }
 
Managed::~Managed()
{ }
 
void *Managed::operator new(size_t size, MemoryPool *pool)
{ return pool->allocate(size); }
 
void Managed::operator delete(void *)
{ }
 
void Managed::operator delete(void *, MemoryPool *)
{ }
 
QT_END_NAMESPACE