content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you 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 org.apache.cassandra.simulator.asm;
  
  import org.objectweb.asm.MethodVisitor;
  import org.objectweb.asm.Opcodes;
  
  /**
   * Handle simply thread signalling behaviours, namely monitorenter/monitorexit bytecodes to
   * {@link org.apache.cassandra.simulator.systems.InterceptorOfGlobalMethods}, and LockSupport invocations to
   * {@link org.apache.cassandra.simulator.systems.InterceptibleThread}.
   *
   * The global static methods we redirect monitors to take only one parameter (the monitor) and also return it,
   * so that they have net zero effect on the stack, permitting the existing monitorenter/monitorexit instructions
   * to remain where they are. LockSupport on the other hand is redirected entirely to the new method.
   */
  class ThreadLocalRandomCheckTransformer extends MethodVisitor
  {
      public ThreadLocalRandomCheckTransformer(int api, MethodVisitor parent)
      {
          super(api, parent);
      }
  
      @Override
      public void visitInsn(int opcode)
      {
          switch (opcode)
          {
              case Opcodes.IRETURN:
                  super.visitMethodInsn(Opcodes.INVOKESTATIC, "org/apache/cassandra/simulator/systems/InterceptorOfSystemMethods$Global",
                                        "threadLocalRandomCheck", "(I)I", false);
                  break;
              case Opcodes.LRETURN:
                  super.visitMethodInsn(Opcodes.INVOKESTATIC, "org/apache/cassandra/simulator/systems/InterceptorOfSystemMethods$Global",
                                        "threadLocalRandomCheck", "(J)J", false);
                  break;
          }
          super.visitInsn(opcode);
      }
  }
  