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.MethodDefinition;
  import com.strobel.assembler.metadata.MethodReference;
  import com.strobel.assembler.metadata.TypeReference;
  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.warning.Roles;
  
  /**
   * @author Tagir Valeev
   *
   */
  @WarningDefinition(category="Correctness", name="PrimitiveArrayPassedAsVarArg", maxScore=60)
  public class IncorrectVarArg {
      @AstVisitor(nodes=AstNodes.EXPRESSIONS)
      public void visit(Expression expr, MethodContext mc) {
          if(expr.getOperand() instanceof MethodReference) {
              MethodReference mr = (MethodReference) expr.getOperand();
              if(mr.getErasedSignature().contains("[Ljava/lang/Object;)")) {
                  Expression lastArg = expr.getArguments().get(expr.getArguments().size()-1);
                  if(lastArg.getCode() == AstCode.InitArray && lastArg.getArguments().size() == 1) {
                      TypeReference nested = lastArg.getArguments().get(0).getInferredType();
                      if(nested != null && nested.isArray() && nested.getElementType().isPrimitive()) {
                          int priority = 0;
                          if(!highPriority(mr)) {
                              priority = 10;
                              MethodDefinition md = mr.resolve();
                              if(md == null) {
                                  priority = 20;
                              } else if(!md.isVarArgs())
                                  return;
                          }
                          mc.report("PrimitiveArrayPassedAsVarArg", priority, lastArg, Roles.CALLED_METHOD.create(mr),
                              Roles.ARRAY_TYPE.create(nested));
                      }
                  }
              }
          }
      }
  
      private static boolean highPriority(MethodReference mr) {
          return mr.getName().equals("asList") && mr.getDeclaringType().getInternalName().equals("java/util/Arrays") ||
                  mr.getName().equals("of") && mr.getDeclaringType().getInternalName().equals("java/util/stream/Stream");
      }
  }
  