コード例 #1
0
 @Override
 public DfaInstructionState[] visitCheckReturnValue(
     CheckReturnValueInstruction instruction, DataFlowRunner runner, DfaMemoryState memState) {
   final DfaValue retValue = memState.pop();
   checkNotNullable(
       memState, retValue, NullabilityProblem.nullableReturn, instruction.getReturn());
   return nextInstruction(instruction, runner, memState);
 }
コード例 #2
0
  @Override
  public DfaInstructionState[] visitFieldReference(
      FieldReferenceInstruction instruction, DataFlowRunner runner, DfaMemoryState memState) {
    final DfaValue qualifier = memState.pop();
    if (!checkNotNullable(
        memState, qualifier, NullabilityProblem.fieldAccessNPE, instruction.getElementToAssert())) {
      forceNotNull(runner, memState, qualifier);
    }

    return nextInstruction(instruction, runner, memState);
  }
コード例 #3
0
 private DfaValue popQualifier(
     MethodCallInstruction instruction, DataFlowRunner runner, DfaMemoryState memState) {
   @NotNull final DfaValue qualifier = memState.pop();
   boolean unboxing = instruction.getMethodType() == MethodCallInstruction.MethodType.UNBOXING;
   NullabilityProblem problem =
       unboxing ? NullabilityProblem.unboxingNullable : NullabilityProblem.callNPE;
   PsiExpression anchor = unboxing ? instruction.getContext() : instruction.getCallExpression();
   if (!checkNotNullable(memState, qualifier, problem, anchor)) {
     forceNotNull(runner, memState, qualifier);
   }
   return qualifier;
 }
コード例 #4
0
  @Override
  public DfaInstructionState[] visitAssign(
      AssignInstruction instruction, DataFlowRunner runner, DfaMemoryState memState) {
    DfaValue dfaSource = memState.pop();
    DfaValue dfaDest = memState.pop();

    if (dfaDest instanceof DfaVariableValue) {
      DfaVariableValue var = (DfaVariableValue) dfaDest;

      DfaValueFactory factory = runner.getFactory();
      if (dfaSource instanceof DfaVariableValue
          && factory.getVarFactory().getAllQualifiedBy(var).contains(dfaSource)) {
        Nullness nullability =
            memState.isNotNull(dfaSource)
                ? Nullness.NOT_NULL
                : ((DfaVariableValue) dfaSource).getInherentNullability();
        dfaSource =
            factory.createTypeValue(((DfaVariableValue) dfaSource).getVariableType(), nullability);
      }

      if (var.getInherentNullability() == Nullness.NOT_NULL) {
        checkNotNullable(
            memState,
            dfaSource,
            NullabilityProblem.assigningToNotNull,
            instruction.getRExpression());
      }
      final PsiModifierListOwner psi = var.getPsiVariable();
      if (!(psi instanceof PsiField) || !psi.hasModifierProperty(PsiModifier.VOLATILE)) {
        memState.setVarValue(var, dfaSource);
      }
    } else if (dfaDest instanceof DfaTypeValue && ((DfaTypeValue) dfaDest).isNotNull()) {
      checkNotNullable(
          memState, dfaSource, NullabilityProblem.assigningToNotNull, instruction.getRExpression());
    }

    memState.push(dfaDest);

    return nextInstruction(instruction, runner, memState);
  }
コード例 #5
0
  @Override
  public DfaInstructionState[] visitBinop(
      BinopInstruction instruction, DataFlowRunner runner, DfaMemoryState memState) {
    myReachable.add(instruction);

    DfaValue dfaRight = memState.pop();
    DfaValue dfaLeft = memState.pop();

    final IElementType opSign = instruction.getOperationSign();
    if (opSign != null) {
      DfaInstructionState[] states =
          handleConstantComparison(instruction, runner, memState, dfaRight, dfaLeft, opSign);
      if (states == null) {
        states = handleRelationBinop(instruction, runner, memState, dfaRight, dfaLeft);
      }
      if (states != null) {
        return states;
      }

      if (PLUS == opSign) {
        memState.push(instruction.getNonNullStringValue(runner.getFactory()));
      } else {
        if (instruction instanceof InstanceofInstruction) {
          handleInstanceof((InstanceofInstruction) instruction, dfaRight, dfaLeft);
        }
        memState.push(DfaUnknownValue.getInstance());
      }
    } else {
      memState.push(DfaUnknownValue.getInstance());
    }

    instruction.setTrueReachable(); // Not a branching instruction actually.
    instruction.setFalseReachable();

    return nextInstruction(instruction, runner, memState);
  }
コード例 #6
0
  @Nullable
  private DfaValue[] popCallArguments(
      MethodCallInstruction instruction, DataFlowRunner runner, DfaMemoryState memState) {
    final PsiExpression[] args = instruction.getArgs();

    PsiMethod method = instruction.getTargetMethod();
    boolean varargCall = instruction.isVarArgCall();
    DfaValue[] argValues;
    if (method == null || instruction.getContracts().isEmpty()) {
      argValues = null;
    } else {
      int paramCount = method.getParameterList().getParametersCount();
      if (paramCount == args.length || method.isVarArgs() && args.length >= paramCount - 1) {
        argValues = new DfaValue[paramCount];
        if (varargCall) {
          argValues[paramCount - 1] = DfaUnknownValue.getInstance();
        }
      } else {
        argValues = null;
      }
    }

    for (int i = 0; i < args.length; i++) {
      final DfaValue arg = memState.pop();
      int paramIndex = args.length - i - 1;
      if (argValues != null && (paramIndex < argValues.length - 1 || !varargCall)) {
        argValues[paramIndex] = arg;
      }

      PsiExpression expr = args[paramIndex];
      Nullness requiredNullability = instruction.getArgRequiredNullability(expr);
      if (requiredNullability == Nullness.NOT_NULL) {
        if (!checkNotNullable(
            memState, arg, NullabilityProblem.passingNullableToNotNullParameter, expr)) {
          forceNotNull(runner, memState, arg);
        }
      } else if (requiredNullability == Nullness.UNKNOWN) {
        checkNotNullable(
            memState, arg, NullabilityProblem.passingNullableArgumentToNonAnnotatedParameter, expr);
      }
    }
    return argValues;
  }
コード例 #7
0
  @Override
  public DfaInstructionState[] visitTypeCast(
      TypeCastInstruction instruction, DataFlowRunner runner, DfaMemoryState memState) {
    final DfaValueFactory factory = runner.getFactory();
    DfaValue dfaExpr = factory.createValue(instruction.getCasted());
    if (dfaExpr != null) {
      DfaTypeValue dfaType =
          (DfaTypeValue) factory.createTypeValue(instruction.getCastTo(), Nullness.UNKNOWN);
      DfaRelationValue dfaInstanceof =
          factory.getRelationFactory().createRelation(dfaExpr, dfaType, INSTANCEOF_KEYWORD, false);
      if (dfaInstanceof != null && !memState.applyInstanceofOrNull(dfaInstanceof)) {
        onInstructionProducesCCE(instruction);
      }
    }

    if (instruction.getCastTo() instanceof PsiPrimitiveType) {
      memState.push(runner.getFactory().getBoxedFactory().createUnboxed(memState.pop()));
    }

    return nextInstruction(instruction, runner, memState);
  }