Method trim

core/arena.cpp:18–40

  {}

  void ScratchArenaManager::trim()
  {
    for (auto& item : allocs)
    {
      Alloc& alloc = item.second;

      if (alloc.arenas.empty())
      {
        // Free the heap because no more arenas are attached
        alloc.heap.reset();
      }
      else
      {
        // Decrease the size of the heap if possible
        size_t newHeapByteSize = 0;
        for (auto arena : alloc.arenas)
          newHeapByteSize = max(newHeapByteSize, arena->byteSize);

        if (newHeapByteSize < alloc.heap->getByteSize())
          alloc.heap->realloc(newHeapByteSize);
      }
    }
  }

  // Attaches a scratch arena and returns the heap that backs its memory
  Heap* ScratchArenaManager::attach(ScratchArena* arena)