refactor(irgen): IR改成alloca和store形式

src/ir/IRBuilder.cpp

@@ -20,6 +20,27 @@ BinaryInst* IRBuilder::CreateBinary(Opcode op, Value* lhs, Value* rhs,
   return insertBlock_->Append<BinaryInst>(op, Type::Int32(), lhs, rhs, name);
 }
 
+AllocaInst* IRBuilder::CreateAllocaI32(const std::string& name) {
+  if (!insertBlock_) {
+    throw std::runtime_error("IRBuilder 未设置插入点");
+  }
+  return insertBlock_->Append<AllocaInst>(name);
+}
+
+LoadInst* IRBuilder::CreateLoad(Value* ptr, const std::string& name) {
+  if (!insertBlock_) {
+    throw std::runtime_error("IRBuilder 未设置插入点");
+  }
+  return insertBlock_->Append<LoadInst>(ptr, name);
+}
+
+StoreInst* IRBuilder::CreateStore(Value* val, Value* ptr) {
+  if (!insertBlock_) {
+    throw std::runtime_error("IRBuilder 未设置插入点");
+  }
+  return insertBlock_->Append<StoreInst>(val, ptr);
+}
+
 ReturnInst* IRBuilder::CreateRet(Value* v) {
   if (!insertBlock_) {
     throw std::runtime_error("IRBuilder 未设置插入点");