assign_generator.cpp

#include "BasicBlock.h"
#include "Constant.h"
#include "Function.h"
#include "IRBuilder.h"
#include "Module.h"
#include "Type.h"

#include <iostream>
#include <memory>

#ifdef DEBUG  // 用于调试信息,大家可以在编译过程中通过" -DDEBUG"来开启这一选项
#define DEBUG_OUTPUT std::cout << __LINE__ << std::endl;  // 输出行号的简单示例
#else
#define DEBUG_OUTPUT
#endif

#define CONST_INT(num) \
    ConstantInt::get(num, module)

#define CONST_FP(num) \
    ConstantFP::get(num, module) // 得到常数值的表示,方便后面多次用到
    
    
int main() {
  auto module = new Module("Cminus code");  // module name是什么无关紧要
  auto builder = new IRBuilder(nullptr, module);
  Type *Int32Type = Type::get_int32_type(module);
  
  
  //main function
  auto mainFun = Function::create(FunctionType::get(Int32Type,{}),"main",module);
  //define the basicblock
  auto bb = BasicBlock::create(module,"entry",mainFun);
  builder->set_insert_point(bb);
  //define return variation 
  auto retAlloca = builder->create_alloca(Int32Type);
  //define a[10]
  auto *arrayType = ArrayType::get(Int32Type,10);
  auto a = builder->create_alloca(arrayType);
  //set the value of return variation
  builder->create_store(CONST_INT(0),retAlloca);
  //set a[0]=10
  auto a0GEP = builder->create_gep(a,{CONST_INT(0),CONST_INT(0)});
  builder->create_store(CONST_INT(10),a0GEP);
  //count a[0]*2
  a0GEP = builder->create_gep(a,{CONST_INT(0),CONST_INT(0)});
  auto a0Load = builder->create_load(a0GEP);
  auto mul=builder->create_imul(a0Load,CONST_INT(2));
  //set a[1]=a[0]*2
  auto a1GEP = builder->create_gep(a,{CONST_INT(0),CONST_INT(1)});
  builder->create_store(mul,a1GEP);
  //return a[1]
  a1GEP = builder->create_gep(a,{CONST_INT(0),CONST_INT(1)});
  auto a1Load = builder->create_load(a1GEP);
  builder->create_ret(a1Load);
  
  
  std::cout<<module->print();
  delete module;
  return 0;
}