Select.h

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// SPDX-License-Identifier: MIT
 
#pragma once
 
#include <memory>
#include <string>
#include <unordered_set>
#include <utility>
 
#include "mini-llvm/ir/Instruction.h"
#include "mini-llvm/ir/InstructionVisitor.h"
#include "mini-llvm/ir/Type.h"
#include "mini-llvm/ir/Use.h"
#include "mini-llvm/ir/Value.h"
#include "mini-llvm/utils/Compiler.h"
 
namespace mini_llvm::ir {
 
class MINI_LLVM_EXPORT Select final : public Instruction {
public:
    Select(std::shared_ptr<Value> cond, std::shared_ptr<Value> trueValue, std::shared_ptr<Value> falseValue)
        : cond_(this, std::move(cond)),
          trueValue_(this, std::move(trueValue)),
          falseValue_(this, std::move(falseValue)) {}
 
    template <typename Self>
    auto &cond(this Self &&self) {
        return self.cond_;
    }
 
    template <typename Self>
    auto &trueValue(this Self &&self) {
        return self.trueValue_;
    }
 
    template <typename Self>
    auto &falseValue(this Self &&self) {
        return self.falseValue_;
    }
 
    std::unordered_set<const UseBase *> operands() const override {
        return {&cond(), &trueValue(), &falseValue()};
    }
 
    bool isFoldable() const override;
    std::shared_ptr<Constant> fold() const override;
 
    void accept(InstructionVisitor &visitor) override {
        visitor.visitSelect(*this);
    }
 
    void accept(InstructionVisitor &visitor) const override {
        visitor.visitSelect(*this);
    }
 
    bool isWellFormed() const override;
 
    std::unique_ptr<Type> type() const override {
        return trueValue()->type();
    }
 
    std::string format() const override;
    std::unique_ptr<Value> clone() const override;
 
private:
    Use<Value> cond_;
    Use<Value> trueValue_, falseValue_;
};
 
} // namespace mini_llvm::ir