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ProGuardCORE is a free library to read, analyze, modify, and write Java class files.

There is a newer version: 9.1.6

/*
 * ProGuardCORE -- library to process Java bytecode.
 *
 * Copyright (c) 2002-2020 Guardsquare NV
 *
 * 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 proguard.evaluation;

import proguard.classfile.Clazz;
import proguard.classfile.attribute.CodeAttribute;
import proguard.evaluation.value.Value;

/**
 * This {@link BranchUnit} remembers the branch unit commands that are invoked on it.
 *
 * @author Eric Lafortune
 */
class TracedBranchUnit extends BasicBranchUnit {
  private boolean isFixed;

  // Implementations for BasicBranchUnit.

  public void reset() {
    super.reset();

    isFixed = false;
  }

  // Implementations for BranchUnit.

  public void branch(Clazz clazz, CodeAttribute codeAttribute, int offset, int branchTarget) {
    super.branch(clazz, codeAttribute, offset, branchTarget);

    isFixed = true;
  }

  public void branchConditionally(
      Clazz clazz, CodeAttribute codeAttribute, int offset, int branchTarget, int conditional) {
    if (conditional == Value.ALWAYS) {
      // Always branch.
      super.branch(clazz, codeAttribute, offset, branchTarget);

      isFixed = true;
    } else if (conditional == Value.MAYBE) {
      if (!isFixed) {
        // Maybe branch.
        super.branchConditionally(clazz, codeAttribute, offset, branchTarget, conditional);
      }
    } else {
      super.wasCalled = true;
    }
  }
}