GlobalVar.h

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// SPDX-License-Identifier: MIT
 
#pragma once
 
#include <cassert>
#include <memory>
#include <string>
#include <typeinfo>
#include <variant>
 
#include "mini-llvm/common/Linkage.h"
#include "mini-llvm/ir/Constant.h"
#include "mini-llvm/ir/ConstantVisitor.h"
#include "mini-llvm/ir/GlobalValue.h"
#include "mini-llvm/ir/Type.h"
#include "mini-llvm/utils/Compiler.h"
 
namespace mini_llvm::ir {
 
class MINI_LLVM_EXPORT GlobalVar final : public GlobalValue {
public:
    GlobalVar(std::unique_ptr<Type> valueType,
              Linkage linkage,
              bool isConstant,
              std::shared_ptr<Constant> initializer);
 
    GlobalVar(std::unique_ptr<Type> valueType, Linkage linkage);
 
    std::unique_ptr<Type> valueType() const {
        return valueType_->clone();
    }
 
    Linkage linkage() const {
        return linkage_;
    }
 
    bool isConstant() const {
        return isConstant_;
    }
 
    Constant &initializer();
    const Constant &initializer() const;
 
    void setInitializer(std::shared_ptr<Constant> initializer);
 
    bool isDeclaration() const override;
 
    void accept(ConstantVisitor &visitor) override {
        visitor.visitGlobalVar(*this);
    }
 
    void accept(ConstantVisitor &visitor) const override {
        visitor.visitGlobalVar(*this);
    }
 
    std::string format() const override;
 
protected:
    bool equals([[maybe_unused]] const Constant &other) const override {
        assert(typeid(*this) != typeid(other));
        return false;
    }
 
private:
    std::unique_ptr<Type> valueType_;
    Linkage linkage_;
    bool isConstant_;
    std::variant<std::monostate, std::shared_ptr<Constant>, std::weak_ptr<Constant>> initializer_;
};
 
} // namespace mini_llvm::ir