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dataflow-shaded is a dataflow framework based on the javac compiler. It differs from the org.checkerframework:dataflow artifact in two ways. First, the packages in this artifact have been renamed to org.checkerframework.shaded.*. Second, unlike the dataflow artifact, this artifact contains the dependencies it requires.

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package org.checkerframework.dataflow.busyexpr;

import java.util.List;
import org.checkerframework.dataflow.analysis.BackwardTransferFunction;
import org.checkerframework.dataflow.analysis.RegularTransferResult;
import org.checkerframework.dataflow.analysis.TransferInput;
import org.checkerframework.dataflow.analysis.TransferResult;
import org.checkerframework.dataflow.analysis.UnusedAbstractValue;
import org.checkerframework.dataflow.cfg.UnderlyingAST;
import org.checkerframework.dataflow.cfg.node.AbstractNodeVisitor;
import org.checkerframework.dataflow.cfg.node.AssignmentNode;
import org.checkerframework.dataflow.cfg.node.MethodInvocationNode;
import org.checkerframework.dataflow.cfg.node.Node;
import org.checkerframework.dataflow.cfg.node.ObjectCreationNode;
import org.checkerframework.dataflow.cfg.node.ReturnNode;

/** A busy expression transfer function */
public class BusyExprTransfer
    extends AbstractNodeVisitor<
        TransferResult,
        TransferInput>
    implements BackwardTransferFunction {

  @Override
  public BusyExprStore initialNormalExitStore(
      UnderlyingAST underlyingAST, List returnNodes) {
    return new BusyExprStore();
  }

  @Override
  public BusyExprStore initialExceptionalExitStore(UnderlyingAST underlyingAST) {
    return new BusyExprStore();
  }

  @Override
  public RegularTransferResult visitNode(
      Node n, TransferInput p) {
    return new RegularTransferResult<>(null, p.getRegularStore());
  }

  @Override
  public RegularTransferResult visitAssignment(
      AssignmentNode n, TransferInput p) {
    RegularTransferResult transferResult =
        (RegularTransferResult) super.visitAssignment(n, p);
    BusyExprStore store = transferResult.getRegularStore();
    store.killBusyExpr(n.getTarget());
    store.addUseInExpression(n.getExpression());
    return transferResult;
  }

  @Override
  public RegularTransferResult visitMethodInvocation(
      MethodInvocationNode n, TransferInput p) {
    RegularTransferResult transferResult =
        (RegularTransferResult)
            super.visitMethodInvocation(n, p);
    BusyExprStore store = transferResult.getRegularStore();
    for (Node arg : n.getArguments()) {
      store.addUseInExpression(arg);
    }
    return transferResult;
  }

  @Override
  public RegularTransferResult visitObjectCreation(
      ObjectCreationNode n, TransferInput p) {
    RegularTransferResult transferResult =
        (RegularTransferResult) super.visitObjectCreation(n, p);
    BusyExprStore store = transferResult.getRegularStore();
    for (Node arg : n.getArguments()) {
      store.addUseInExpression(arg);
    }
    return transferResult;
  }

  @Override
  public RegularTransferResult visitReturn(
      ReturnNode n, TransferInput p) {
    RegularTransferResult transferResult =
        (RegularTransferResult) super.visitReturn(n, p);
    Node result = n.getResult();
    if (result != null) {
      BusyExprStore store = transferResult.getRegularStore();
      store.addUseInExpression(result);
    }
    return transferResult;
  }
}