FakeUse.h

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// SPDX-License-Identifier: MIT
 
#pragma once
 
#include <format>
#include <memory>
#include <string>
#include <unordered_set>
 
#include "mini-llvm/mir/ImmediateOperand.h"
#include "mini-llvm/mir/Instruction.h"
#include "mini-llvm/mir/InstructionVisitor.h"
#include "mini-llvm/mir/MemoryOperand.h"
#include "mini-llvm/mir/PhysicalRegister.h"
#include "mini-llvm/mir/RegisterOperand.h"
#include "mini-llvm/utils/Compiler.h"
 
namespace mini_llvm::mir {
 
class MINI_LLVM_EXPORT FakeUse : public Instruction {
public:
    explicit FakeUse(PhysicalRegister *physReg) : physReg_(physReg) {}
 
    PhysicalRegister *physReg() const {
        return physReg_;
    }
 
    std::unordered_set<const RegisterOperand *> regOps() const override {
        return {};
    }
 
    std::unordered_set<const RegisterOperand *> dsts() const override {
        return {};
    }
 
    std::unordered_set<const RegisterOperand *> srcs() const override {
        return {};
    }
 
    std::unordered_set<PhysicalRegister *> implicitSrcs() const override {
        return {physReg()};
    }
 
    std::unordered_set<const ImmediateOperand *> immOps() const override {
        return {};
    }
 
    std::unordered_set<const MemoryOperand *> memOps() const override {
        return {};
    }
 
    bool hasSideEffects() const override {
        return true;
    }
 
    std::string format() const override {
        return std::format("FAKEUSE {}", *physReg());
    }
 
    std::unique_ptr<Instruction> clone() const override {
        return std::make_unique<FakeUse>(physReg());
    }
 
    void accept(InstructionVisitor &visitor) override {
        visitor.visitLive(*this);
    }
 
    void accept(InstructionVisitor &visitor) const override {
        visitor.visitLive(*this);
    }
 
private:
    PhysicalRegister *physReg_;
};
 
} // namespace mini_llvm::mir