boomerang.scene.wala.WALAIfStatement Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of boomerangScope-WALA Show documentation

There is a newer version: 3.2.2

/**
 * ***************************************************************************** Copyright (c) 2020
 * CodeShield GmbH, Paderborn, Germany. This program and the accompanying materials are made
 * available under the terms of the Eclipse Public License 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors: Johannes Spaeth - initial API and implementation
 * *****************************************************************************
 */
package boomerang.scene.wala;

import boomerang.scene.IfStatement;
import boomerang.scene.Statement;
import boomerang.scene.Val;
import com.ibm.wala.shrike.shrikeBT.IConditionalBranchInstruction;
import com.ibm.wala.ssa.SSAConditionalBranchInstruction;

public class WALAIfStatement implements IfStatement {

  private SSAConditionalBranchInstruction delegate;
  private WALAMethod method;
  private Statement target;

  public WALAIfStatement(SSAConditionalBranchInstruction delegate, WALAMethod method) {
    this.delegate = delegate;
    this.method = method;
    this.target = method.getBranchTarget(delegate.getTarget());
  }

  @Override
  public Statement getTarget() {
    return target;
  }

  @Override
  public Evaluation evaluate(Val val) {
    WALAVal op1 = new WALAVal(delegate.getUse(0), method);
    WALAVal op2 = new WALAVal(delegate.getUse(1), method);
    if (delegate.getOperator().equals(IConditionalBranchInstruction.Operator.NE)) {
      if ((val.equals(op1) && op2.isNull()) || (val.equals(op2) && op1.isNull())) {
        return Evaluation.FALSE;
      }
    }

    if (delegate.getOperator().equals(IConditionalBranchInstruction.Operator.EQ)) {
      if ((val.equals(op1) && op2.isNull()) || (val.equals(op2) && op1.isNull())) {
        return Evaluation.TRUE;
      }
    }

    return Evaluation.UNKOWN;
  }

  @Override
  public boolean uses(Val val) {
    WALAVal op1 = new WALAVal(delegate.getUse(0), method);
    WALAVal op2 = new WALAVal(delegate.getUse(1), method);
    return val.equals(op1) || val.equals(op2);
  }
}