Function SingleStep

source/common/objects/dobjgc.cpp:451–501

//==========================================================================

static size_t SingleStep()
{
	switch (State)
	{
	case GCS_Pause:
		MarkRoot();		// Start a new collection
		return 0;

	case GCS_Propagate:
		if (Gray != nullptr)
		{
			return PropagateMark();
		}
		else
		{ // no more gray objects
			Atomic();	// finish mark phase
			return 0;
		}

	case GCS_Sweep: {
		RunningDeallocBytes = 0;
		size_t swept = SweepObjects(GCSWEEPGRANULARITY);
		Estimate -= RunningDeallocBytes;
		if (*SweepPos == nullptr)
		{ // Nothing more to sweep?
			SweepDone();
		}
		return swept;
	  }

	case GCS_Destroy: {
		size_t destroy_size;
		destroy_size = DestroyObjects(GCSWEEPGRANULARITY);
		Estimate -= destroy_size;
		if (ToDestroy == nullptr)
		{ // Nothing more to destroy?
			State = GCS_Done;
		}
		return destroy_size;
	  }

	case GCS_Done:
		State = GCS_Pause;		// end collection
		SetThreshold();
		return 0;

	default:
		assert(0);
		return 0;
	}
}

//==========================================================================
//