Ejemplo n.º 1
0
 void checkAssignment(BlockScope scope, TypeBinding lhsType, TypeBinding rhsType) {
   FieldBinding leftField = getLastField(this.lhs);
   if (leftField != null
       && rhsType != TypeBinding.NULL
       && (lhsType.kind() == Binding.WILDCARD_TYPE)
       && ((WildcardBinding) lhsType).boundKind != Wildcard.SUPER) {
     scope.problemReporter().wildcardAssignment(lhsType, rhsType, this.expression);
   } else if (leftField != null
       && !leftField.isStatic()
       && leftField.declaringClass != null /*length pseudo field*/
       && leftField.declaringClass.isRawType()) {
     scope.problemReporter().unsafeRawFieldAssignment(leftField, rhsType, this.lhs);
   } else if (rhsType.needsUncheckedConversion(lhsType)) {
     scope.problemReporter().unsafeTypeConversion(this.expression, rhsType, lhsType);
   }
 }
Ejemplo n.º 2
0
  public TypeBinding resolveType(BlockScope scope) {
    // due to syntax lhs may be only a NameReference, a FieldReference or an ArrayReference
    this.constant = Constant.NotAConstant;
    if (!(this.lhs instanceof Reference) || this.lhs.isThis()) {
      scope.problemReporter().expressionShouldBeAVariable(this.lhs);
      return null;
    }
    TypeBinding lhsType = lhs.resolveType(scope);
    this.expression.setExpectedType(lhsType); // needed in case of generic method invocation
    if (lhsType != null) {
      this.resolvedType = lhsType.capture(scope, this.sourceEnd);
    }
    TypeBinding rhsType = this.expression.resolveType(scope);
    if (lhsType == null || rhsType == null) {
      return null;
    }
    // check for assignment with no effect
    Binding left = getDirectBinding(this.lhs);
    if (left != null && left == getDirectBinding(this.expression)) {
      scope.problemReporter().assignmentHasNoEffect(this, left.shortReadableName());
    }

    // Compile-time conversion of base-types : implicit narrowing integer into byte/short/character
    // may require to widen the rhs expression at runtime
    if (lhsType != rhsType) { // must call before computeConversion() and typeMismatchError()
      scope.compilationUnitScope().recordTypeConversion(lhsType, rhsType);
    }
    if ((this.expression.isConstantValueOfTypeAssignableToType(rhsType, lhsType)
            || (lhsType.isBaseType() && BaseTypeBinding.isWidening(lhsType.id, rhsType.id)))
        || rhsType.isCompatibleWith(lhsType)) {
      this.expression.computeConversion(scope, lhsType, rhsType);
      checkAssignment(scope, lhsType, rhsType);
      if (this.expression instanceof CastExpression
          && (this.expression.bits & ASTNode.UnnecessaryCast) == 0) {
        CastExpression.checkNeedForAssignedCast(scope, lhsType, (CastExpression) this.expression);
      }
      return this.resolvedType;
    } else if (scope.isBoxingCompatibleWith(rhsType, lhsType)
        || (rhsType.isBaseType() // narrowing then boxing ?
            && scope.compilerOptions().sourceLevel >= ClassFileConstants.JDK1_5 // autoboxing
            && !lhsType.isBaseType()
            && this.expression.isConstantValueOfTypeAssignableToType(
                rhsType, scope.environment().computeBoxingType(lhsType)))) {
      this.expression.computeConversion(scope, lhsType, rhsType);
      if (this.expression instanceof CastExpression
          && (this.expression.bits & ASTNode.UnnecessaryCast) == 0) {
        CastExpression.checkNeedForAssignedCast(scope, lhsType, (CastExpression) this.expression);
      }
      return this.resolvedType;
    }
    scope.problemReporter().typeMismatchError(rhsType, lhsType, this.expression, this.lhs);
    return lhsType;
  }