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  * Copyright (C) 2015 The Pennsylvania State University and the University of Wisconsin
  * Systems and Internet Infrastructure Security Laboratory
  * Author: Damien Octeau
  * 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
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.
package edu.psu.cse.siis.coal;
import soot.Unit;
import soot.Value;
A factory for normal edge functions. Normal edge functions indicate how values are propagated through normal (non-call) statements.
public class NormalEdgeFunctionFactory {
  private final Logger logger = LoggerFactory.getLogger(getClass());

Returns a normal edge function.

curr The current statement.
currNode The current variable.
succNode The variable the current variable is propagated to after the statement.
zeroValue The zero value, which represents the absence of a data flow fact.
pointsToAnalysis The pointer analysis.
A normal edge function.
      Value succNodeValue zeroValuePointsToAnalysis pointsToAnalysis) {
    if (curr instanceof AssignStmt) {
      if (.isDebugEnabled()) {
        .debug("Normal edge: " + curr);
        .debug(currNode + " " + succNode);
      AssignStmt assignStmt = (AssignStmtcurr;
      final Value left = assignStmt.getLeftOp();
      final String type = left.getType().toString();
      final Value right = assignStmt.getRightOp();
      if (Model.v().isModeledType(type)) {
        if (currNode.equivTo(zeroValue) && succNode.equivTo(left)) {
          if (right instanceof StaticFieldRef) {
            StaticFieldRef staticFieldRef = (StaticFieldRefright;
            Argument[] arguments =
            EdgeFunction<BasePropagationValueresult =
            if (arguments != null) {
              if (.isDebugEnabled()) {
                .debug("Returning " + result);
              return PropagationTransformerFactory.makeTransformer(nullargumentsfalse);
          } else if (right instanceof NullConstant) {
            return PropagationTransformerFactory.makeTransformer(nullnullfalse);
    return EdgeIdentity.v();
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