content: /*
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package io.airlift.bytecode.expression;
  
  import com.google.common.collect.ImmutableList;
  import io.airlift.bytecode.BytecodeBlock;
  import io.airlift.bytecode.BytecodeNode;
  import io.airlift.bytecode.MethodGenerationContext;
  import io.airlift.bytecode.OpCode;
  import io.airlift.bytecode.ParameterizedType;
  
  import java.util.List;
  
  import static io.airlift.bytecode.ParameterizedType.type;
  import static java.util.Objects.requireNonNull;
  
  class ReturnBytecodeExpression
          extends BytecodeExpression
  {
      private final BytecodeExpression instance;
      private final OpCode returnOpCode;
  
      ReturnBytecodeExpression(BytecodeExpression instance)
      {
          super(type(void.class));
          this.instance = requireNonNull(instance, "instance is null");
          this.returnOpCode = returnOpCode(instance.getType());
      }
  
      @Override
      public BytecodeNode getBytecode(MethodGenerationContext generationContext)
      {
          return new BytecodeBlock()
                  .append(instance.getBytecode(generationContext))
                  .append(returnOpCode);
      }
  
      @Override
      protected String formatOneLine()
      {
          return "return " + instance;
      }
  
      @Override
      public List<BytecodeNode> getChildNodes()
      {
          return ImmutableList.of(instance);
      }
  
      private static OpCode returnOpCode(ParameterizedType componentType)
      {
          Class<?> primitiveType = componentType.getPrimitiveType();
          if (primitiveType != null) {
              if (primitiveType == byte.class ||
                      primitiveType == boolean.class ||
                      primitiveType == char.class ||
                      primitiveType == short.class ||
                      primitiveType == int.class) {
                  return OpCode.IRETURN;
              }
              if (primitiveType == long.class) {
                  return OpCode.LRETURN;
              }
              if (primitiveType == float.class) {
                  return OpCode.FRETURN;
              }
              if (primitiveType == double.class) {
                  return OpCode.DRETURN;
              }
              if (primitiveType == void.class) {
                  return OpCode.RETURN;
              }
              throw new IllegalArgumentException("Unsupported array type: " + primitiveType);
          }
          else {
              return OpCode.ARETURN;
          }
      }
  }
  