refactor(irgen): IR改成alloca和store形式

src/ir/IRPrinter.cpp

@@ -15,6 +15,8 @@ static const char* TypeToString(const Type& ty) {
       return "void";
     case Type::Kind::Int32:
       return "i32";
+    case Type::Kind::PtrInt32:
+      return "i32*";
   }
   throw std::runtime_error("未知类型");
 }
@@ -27,6 +29,12 @@ static const char* OpcodeToString(Opcode op) {
       return "sub";
     case Opcode::Mul:
       return "mul";
+    case Opcode::Alloca:
+      return "alloca";
+    case Opcode::Load:
+      return "load";
+    case Opcode::Store:
+      return "store";
     case Opcode::Ret:
       return "ret";
   }
@@ -42,6 +50,7 @@ void IRPrinter::Print(const Module& module) {
       std::cout << "}\n";
       continue;
     }
+    std::cout << "entry:\n";
     for (const auto& instPtr : bb->instructions()) {
       const auto* inst = instPtr.get();
       switch (inst->opcode()) {
@@ -54,6 +63,23 @@ void IRPrinter::Print(const Module& module) {
                     << bin->lhs()->name() << ", " << bin->rhs()->name() << "\n";
           break;
         }
+        case Opcode::Alloca: {
+          auto* alloca = static_cast<const AllocaInst*>(inst);
+          std::cout << "  " << alloca->name() << " = alloca i32\n";
+          break;
+        }
+        case Opcode::Load: {
+          auto* load = static_cast<const LoadInst*>(inst);
+          std::cout << "  " << load->name() << " = load i32, i32* "
+                    << load->ptr()->name() << "\n";
+          break;
+        }
+        case Opcode::Store: {
+          auto* store = static_cast<const StoreInst*>(inst);
+          std::cout << "  store i32 " << store->value()->name() << ", i32* "
+                    << store->ptr()->name() << "\n";
+          break;
+        }
         case Opcode::Ret: {
           auto* ret = static_cast<const ReturnInst*>(inst);
           std::cout << "  ret " << TypeToString(*ret->value()->type()) << " "