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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#pragma once
#include "compiler.h"
//------------------------------------------------------------------------
// TreeLifeUpdater: class that handles changes in variable liveness from a given tree.
// Keeps set of temporary VARSET_TP during its lifetime to avoid unnecessary memory allocations.
template <bool ForCodeGen>
class TreeLifeUpdater
{
public:
TreeLifeUpdater(Compiler* compiler);
void UpdateLife(GenTree* tree);
private:
void UpdateLifeVar(GenTree* tree);
private:
Compiler* compiler;
VARSET_TP newLife; // a live set after processing an argument tree.
VARSET_TP stackVarDeltaSet; // a live set of tracked stack ptr lcls.
VARSET_TP varDeltaSet; // a set of variables that changed their liveness.
VARSET_TP gcTrkStkDeltaSet; // // a set of gc tracked stack variables that changed their liveness..
#ifdef DEBUG
VARSET_TP gcVarPtrSetNew; // a set to print changes to live part of tracked stack ptr lcls (gcVarPtrSetCur).
unsigned epoch; // VarSets epoch when the class was created, must stay the same during its using.
#endif // DEBUG
};
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