ReferenceAnalyzer.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 "VisitorTracker.hpp"
 
#include "CeresEngine/Material/ShaderCompiler/SymbolTable.hpp"
#include "CeresEngine/Material/ShaderCompiler/Targets.hpp"
 
#include "CeresEngine/Material/ShaderCompiler/AST/Token.hpp"
 
namespace CeresEngine::ShaderCompiler {
 
    class ReferenceAnalyzer : private VisitorTracker {
    private:
        Program* mProgram = nullptr;
        ShaderTarget mShaderTarget = ShaderTarget::VertexShader;
 
        Vector<CallExpression*> mCallExpressionStack;
 
    public:
        // Marks all declarational AST nodes (i.e. function decl, structure decl etc.) that are reachable from the specififed entry point.
        void markReferencesFromEntryPoint(Program& program, const ShaderTarget shaderTarget);
 
    private:
        // Marks the specified AST node as reachable and returns false if the AST node has already been marked as reachable.
        bool reachable(AST* ast);
 
        void visitStatementList(const Vector<StatementPtr>& statements);
 
        void markLValueExpression(const Expression* expression);
        void markLValueExpressionObject(const ObjectExpression* objectExpression);
 
    private: // Visitor implementation
        DECLARATION_VISIT_PROC(CodeBlock);
        DECLARATION_VISIT_PROC(SwitchCase);
        DECLARATION_VISIT_PROC(TypeSpecifier);
 
        DECLARATION_VISIT_PROC(VarDeclaration);
        DECLARATION_VISIT_PROC(StructDeclaration);
        DECLARATION_VISIT_PROC(BufferDeclaration);
        DECLARATION_VISIT_PROC(SamplerDeclaration);
 
        DECLARATION_VISIT_PROC(FunctionDeclaration);
        DECLARATION_VISIT_PROC(UniformBufferDeclaration);
        DECLARATION_VISIT_PROC(BufferDeclarationStatement);
        DECLARATION_VISIT_PROC(SamplerDeclarationStatement);
        DECLARATION_VISIT_PROC(VarDeclarationStatement);
 
        DECLARATION_VISIT_PROC(UnaryExpression);
        DECLARATION_VISIT_PROC(PostUnaryExpression);
        DECLARATION_VISIT_PROC(CallExpression);
        DECLARATION_VISIT_PROC(ObjectExpression);
        DECLARATION_VISIT_PROC(AssignExpression);
    };
 
} // namespace CeresEngine::ShaderCompiler