Optimizer.hpp

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//
//  CeresEngine - A game development framework
//
//  Created by Rogiel Sulzbach.
//  Copyright (c) 2018-2022 Rogiel Sulzbach. All rights reserved.
//
 
#pragma once
 
#include "Visitor.hpp"
 
#include "CeresEngine/Foundation/Container/Vector.hpp"
 
namespace CeresEngine::ShaderCompiler {
 
    //TODO: replace this class by "ExpressionConverter".
 
    // This AST optimizer supports only little optimizations such as null-statement removal.
    class Optimizer : private Visitor {
    public:
        // Optimizes the specified program AST.
        void optimize(Program& program);
 
    private:
        void optimizeStatementList(Vector<StatementPtr>& statements);
 
        void optimizeExpression(ExpressionPtr& expression);
 
        [[nodiscard]] bool canRemoveStatement(const Statement& ast) const;
 
    private: // Visitor implementation
        DECLARATION_VISIT_PROC(CodeBlock);
        DECLARATION_VISIT_PROC(SwitchCase);
        DECLARATION_VISIT_PROC(ArrayDimension);
 
        DECLARATION_VISIT_PROC(VarDeclaration);
 
        DECLARATION_VISIT_PROC(ForLoopStatement);
        DECLARATION_VISIT_PROC(WhileLoopStatement);
        DECLARATION_VISIT_PROC(DoWhileLoopStatement);
        DECLARATION_VISIT_PROC(IfStatement);
        DECLARATION_VISIT_PROC(ElseStatement);
        DECLARATION_VISIT_PROC(SwitchStatement);
        DECLARATION_VISIT_PROC(ExpressionStatement);
        DECLARATION_VISIT_PROC(ReturnStatement);
 
        DECLARATION_VISIT_PROC(SequenceExpression);
        DECLARATION_VISIT_PROC(TernaryExpression);
        DECLARATION_VISIT_PROC(BinaryExpression);
        DECLARATION_VISIT_PROC(UnaryExpression);
        DECLARATION_VISIT_PROC(PostUnaryExpression);
        DECLARATION_VISIT_PROC(BracketExpression);
        DECLARATION_VISIT_PROC(ObjectExpression);
        DECLARATION_VISIT_PROC(AssignExpression);
        DECLARATION_VISIT_PROC(ArrayExpression);
        DECLARATION_VISIT_PROC(CastExpression);
        DECLARATION_VISIT_PROC(InitializerExpression);
    };
 
} // namespace CeresEngine::ShaderCompiler