#pragma once
#include "common.h"

namespace codegen{

// a?, t?, ra are caller-saved
// s? are callee-saved
// x0,gp,tp are preserved in user-space
enum class RV64Reg {
  x0 = 0,       // zero
  x1,       // ra, caller
  x2,       // sp, callee
  x3,       // gp
  x4,       // tp
  x5,       // t0, caller
  x6,x7,    // t1-2, caller
  x8,       // s0/fp, callee
  x9,       // s1, callee
  x10,x11,  // a0-1,caller
  x12,x13,x14,x15,x16,x17, // a2-7,caller
  x18,x19,x20,x21,x22,x23,x24,x25,x26,x27, // s2-11,callee
  x28,x29,x30,x31,  // t3-6,caller
};

inline std::string Reg2Name(RV64Reg reg) {
  std::string regname = "x" + std::to_string((int)reg);
  return regname;
}

class MOperand {
public:
  enum class type {
    Virt,
    Imm,
    Reg,
  } op_type;
  int value;

};

class MInst {
public:
  enum class MInstTag {
    Add, Sub, Rsb, Mul, Div, Mod, Lt, Le, Ge, Gt, Eq, Ne, And, Or,
    LongMul, FMA, Mv, Branch, Jump, Return,  Load, Store,Compare, Call, Global,
  } tag;

  MInst(MInstTag tag) : tag(tag) {}
};

class MBasicBlock {

};

class MFunction {
  std::list<uptr(MBasicBlock)> bbs;
  
};

class MGlobalVar {

};

class MCModule {
  std::list<uptr(MFunction)> functions;
  std::list<uptr(MGlobalVar)> globals;
};

}