java/java-analysis-impl/src/com/intellij/codeInspection/bytecodeAnalysis/asm/InterpreterExt.java

/*
 * Copyright 2000-2014 JetBrains s.r.o.
 *
 * 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 com.intellij.codeInspection.bytecodeAnalysis.asm;

/**
 * @author lambdamix
 */
public interface InterpreterExt<Data> { // self: Interpreter[_] =>

  // init interpreter state by passing entry data
  void init(Data previous);

  // exit data after execution for edge to insn
  // there are may be different outcomes for different edges if an instruction was branching one
  Data getAfterData(int insn);

  // merge two states
  Data merge(Data data1, Data data2);
}