content: /*
   * Copyright 2016 HuntBugs contributors
   * 
   * 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 one.util.huntbugs.detect;
  
  import com.strobel.assembler.metadata.FieldReference;
  import com.strobel.decompiler.ast.AstCode;
  import com.strobel.decompiler.ast.Expression;
  import one.util.huntbugs.registry.MethodContext;
  import one.util.huntbugs.registry.anno.AstNodes;
  import one.util.huntbugs.registry.anno.AstVisitor;
  import one.util.huntbugs.registry.anno.WarningDefinition;
  import one.util.huntbugs.util.NodeChain;
  import one.util.huntbugs.util.Nodes;
  
  /**
   * @author lan
   *
   */
  @WarningDefinition(category="Multithreading", name="SynchronizationOnUpdatedField", maxScore=65)
  public class SyncOnUpdatedField {
      @AstVisitor(nodes=AstNodes.EXPRESSIONS)
      public void visit(Expression expr, NodeChain nc, MethodContext mc) {
          if(expr.getCode() == AstCode.PutField || expr.getCode() == AstCode.PutStatic) {
              FieldReference fr = (FieldReference) expr.getOperand();
              while(nc != null) {
                  Expression syncObject = nc.getSyncObject();
                  if(syncObject != null) {
                      if(syncObject.getCode() == AstCode.GetField && expr.getCode() == AstCode.PutField) {
                          FieldReference sfr = (FieldReference) syncObject.getOperand();
                          if(sfr.isEquivalentTo(fr) && Nodes.isEquivalent(Nodes.getChild(expr, 0), Nodes.getChild(syncObject, 0))) {
                              mc.report("SynchronizationOnUpdatedField", 0, expr);
                          }
                      } else if(syncObject.getCode() == AstCode.GetStatic && expr.getCode() == AstCode.PutStatic) {
                          FieldReference sfr = (FieldReference) syncObject.getOperand();
                          if(sfr.isEquivalentTo(fr)) {
                              mc.report("SynchronizationOnUpdatedField", 0, expr);
                          }
                      }
                  }
                  nc = nc.getParent();
              }
          }
      }
  }
  