Trait

org.opalj.ai.domain.l1

ReferenceValues

Related Doc: package l1

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trait ReferenceValues extends DefaultTypeLevelReferenceValues with Origin

This partial domain enables tracking of a reference value's null-ness and must-alias information.

Self Type
ReferenceValues with CorrelationalDomainSupport with IntegerValuesDomain with TypedValuesFactory with Configuration with TheClassHierarchy
Source
ReferenceValues.scala
Linear Supertypes
Known Subclasses
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Inherited
  1. ReferenceValues
  2. Origin
  3. DefaultTypeLevelReferenceValues
  4. TypeLevelReferenceValues
  5. AsJavaObject
  6. GeneralizedArrayHandling
  7. ReferenceValuesDomain
  8. ReferenceValuesFactory
  9. ExceptionsFactory
  10. DefaultDomainValueBinding
  11. ValuesDomain
  12. AnyRef
  13. Any
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Visibility
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Type Members

  1. abstract type AReferenceValue <: (ReferenceValues.this)#ReferenceValue with (ReferenceValues.this)#DomainReferenceValue

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  2. trait ArrayAbstraction extends AnyRef

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    Definition Classes
    TypeLevelReferenceValues
  3. type ArrayLoadResult = Computation[(ReferenceValues.this)#DomainValue, (ReferenceValues.this)#ExceptionValues]

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    Computation that returns the value stored in an array at a given index or an exception.

    Computation that returns the value stored in an array at a given index or an exception. The exceptions that may be thrown are: NullPointerException and ArrayIndexOutOfBoundsException.

    Definition Classes
    ReferenceValuesDomain
  4. type ArrayStoreResult = Computation[Nothing, (ReferenceValues.this)#ExceptionValues]

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    Computation that succeeds (updates the value stored in the array at the given index) or that throws an exception.

    Computation that succeeds (updates the value stored in the array at the given index) or that throws an exception. The exceptions that may be thrown are: NullPointerException, ArrayIndexOutOfBoundsException and ArrayStoreException.

    Definition Classes
    ReferenceValuesDomain
  5. class ArrayValue extends (ReferenceValues.this)#ArrayValue with (ReferenceValues.this)#NonNullSingleOriginSReferenceValue

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    Attributes
    protected
  6. abstract type DomainArrayValue <: (ReferenceValues.this)#ArrayValue with (ReferenceValues.this)#DomainSingleOriginReferenceValue

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  7. final type DomainIllegalValue = (ReferenceValues.this)#IllegalValue

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    Abstracts over the concrete type of IllegalValue.

    Abstracts over the concrete type of IllegalValue.

    This type needs to be refined whenever the class IllegalValue is refined or the type DomainValue is refined.

    Definition Classes
    DefaultDomainValueBindingValuesDomain
  8. abstract type DomainMultipleReferenceValues <: (ReferenceValues.this)#MultipleReferenceValues with (ReferenceValues.this)#AReferenceValue

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  9. abstract type DomainNullValue <: (ReferenceValues.this)#NullValue with (ReferenceValues.this)#DomainSingleOriginReferenceValue

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  10. abstract type DomainObjectValue <: (ReferenceValues.this)#ObjectValue with (ReferenceValues.this)#DomainSingleOriginReferenceValue

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  11. abstract type DomainReferenceValue >: Null <: (ReferenceValues.this)#ReferenceValue with (ReferenceValues.this)#DomainTypedValue[ReferenceType]

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    Definition Classes
    ValuesDomain
  12. final type DomainReturnAddressValue = (ReferenceValues.this)#ReturnAddressValue

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    Abstracts over the concrete type of ReturnAddressValue.

    Abstracts over the concrete type of ReturnAddressValue. Needs to be fixed by some sub-trait/sub-class. In the simplest case (i.e., when neither the Value trait nor the ReturnAddressValue trait was refined) it is sufficient to write:

    type DomainReturnAddressValue = ReturnAddressValue
    Definition Classes
    DefaultDomainValueBindingValuesDomain
  13. final type DomainReturnAddressValues = (ReferenceValues.this)#ReturnAddressValues

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  14. abstract type DomainSingleOriginReferenceValue <: (ReferenceValues.this)#SingleOriginReferenceValue with (ReferenceValues.this)#AReferenceValue

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  15. final type DomainTypedValue[+T <: Type] = (ReferenceValues.this)#TypedValue[T]

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  16. final type DomainValue = (ReferenceValues.this)#Value

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    Abstracts over the concrete type of Value.

    Abstracts over the concrete type of Value. Needs to be refined by traits that inherit from Domain and which extend Domain's Value trait.

    Definition Classes
    DefaultDomainValueBindingValuesDomain
  17. type ExceptionValue = (ReferenceValues.this)#DomainReferenceValue

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    A simple type alias of the type DomainValue; used to facilitate comprehension.

    A simple type alias of the type DomainValue; used to facilitate comprehension.

    Definition Classes
    ValuesDomain
  18. type ExceptionValues = Iterable[(ReferenceValues.this)#ExceptionValue]

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    A type alias for Iterables of ExceptionValues; used to facilitate comprehension.

    A type alias for Iterables of ExceptionValues; used to facilitate comprehension.

    Definition Classes
    ValuesDomain
  19. class IllegalValue extends Value

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    Represents a value that has no well defined state/type.

    Represents a value that has no well defined state/type. Such values are the result of a join of two incompatible values and are generally only found in registers (in the locals) and then identify a value that is dead.

    Attributes
    protected
    Definition Classes
    ValuesDomain
    See also

    org.opalj.ai.Domain.Value for further details.

  20. type Locals = collection.mutable.Locals[(ReferenceValues.this)#DomainValue]

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    An instruction's current register values/locals are represented using an array.

    An instruction's current register values/locals are represented using an array.

    Definition Classes
    ValuesDomain
  21. type LocalsArray = Array[(ReferenceValues.this)#Locals]

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    Definition Classes
    ValuesDomain
  22. class MObjectValue extends (ReferenceValues.this)#MObjectValue with (ReferenceValues.this)#ObjectValue

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    Attributes
    protected
  23. trait MultipleOriginsValue extends (Origin.this)#ValueWithOriginInformation

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    Should be mixed in by Value classes that capture information about all origins of a value.

    Should be mixed in by Value classes that capture information about all origins of a value.

    Definition Classes
    Origin
  24. class MultipleReferenceValues extends (ReferenceValues.this)#ReferenceValue with (ReferenceValues.this)#MultipleOriginsValue

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    A MultipleReferenceValues tracks multiple reference values (of type NullValue, ArrayValue, SObjectValue and MObjectValue) that have different origins.

    A MultipleReferenceValues tracks multiple reference values (of type NullValue, ArrayValue, SObjectValue and MObjectValue) that have different origins. I.e., per value origin one domain value is used to abstract over the properties of that respective value.

    Attributes
    protected
  25. trait NonNullSingleOriginReferenceValue extends (ReferenceValues.this)#SingleOriginReferenceValue

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  26. trait NonNullSingleOriginSReferenceValue extends (ReferenceValues.this)#NonNullSingleOriginReferenceValue

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  27. class NullValue extends (ReferenceValues.this)#NullValue with (ReferenceValues.this)#SingleOriginReferenceValue

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    Attributes
    protected
  28. trait ObjectValue extends (ReferenceValues.this)#ObjectValue with (ReferenceValues.this)#NonNullSingleOriginReferenceValue

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  29. type Operands = Chain[(ReferenceValues.this)#DomainValue]

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    An instruction's operands are represented using a list where the first element of the list represents the top level operand stack value.

    An instruction's operands are represented using a list where the first element of the list represents the top level operand stack value.

    Definition Classes
    ValuesDomain
  30. type OperandsArray = Array[(ReferenceValues.this)#Operands]

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    Definition Classes
    ValuesDomain
  31. trait RETValue extends Value

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    Definition Classes
    ValuesDomain
  32. trait ReferenceValue extends (ReferenceValues.this)#ReferenceValue

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    Representation of some reference value; this includes Object, Array and Null values.

    Representation of some reference value; this includes Object, Array and Null values.

    This trait defines the additional methods needed for the refinement of the new properties.

  33. type Refinements = IdentityHashMap[(ReferenceValues.this)#AReferenceValue, (ReferenceValues.this)#AReferenceValue]

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    A map that contains the refined values (the map's values) of some old values (the map's keys).

  34. class ReturnAddressValue extends RETValue

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    Stores a single return address (i.e., a program counter/index into the code array).

    Stores a single return address (i.e., a program counter/index into the code array).

    Definition Classes
    ValuesDomain
    Note

    Though the framework completely handles all aspects related to return address values, it is nevertheless necessary that this class inherits from Value as return addresses are stored on the stack/in the registers. However, if the Value trait should be refined, all additional methods may – from the point-of-view of OPAL-AI - just throw an OperationNotSupportedException as these additional methods will never be called by OPAL-AI.

  35. class ReturnAddressValues extends RETValue

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    A collection of (not furhter stored) return address values.

    A collection of (not furhter stored) return address values. Primarily used when we join the executions of subroutines.

    Definition Classes
    ValuesDomain
  36. class SObjectValue extends (ReferenceValues.this)#SObjectValue with (ReferenceValues.this)#ObjectValue with (ReferenceValues.this)#NonNullSingleOriginSReferenceValue

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    Attributes
    protected
  37. trait SReferenceValue[T <: ReferenceType] extends AnyRef

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    A reference value with a single (upper) type (bound).

    A reference value with a single (upper) type (bound).

    Attributes
    protected[this]
    Definition Classes
    TypeLevelReferenceValues
  38. trait SingleOriginReferenceValue extends (ReferenceValues.this)#ReferenceValue with (ReferenceValues.this)#SingleOriginValue with UID

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    Represents all DomainReferenceValues that represent a reference value where – in the current analysis context – the value has a single origin.

    Represents all DomainReferenceValues that represent a reference value where – in the current analysis context – the value has a single origin.

    Note

    To make it possible to store SingleOriginReferenceValues in UIDSets - which in particular provide fast filter and tail methods compared to the standard sets - the UID trait is implemented.

  39. trait SingleOriginValue extends (Origin.this)#ValueWithOriginInformation

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    Should be mixed in by Values that have a single origin.

    Should be mixed in by Values that have a single origin.

    Definition Classes
    Origin
  40. type Timestamp = Int

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    The timestamp enables us to distinguish two values created/returned by the same instruction (two values with the same origin) but at a different point in time.

    The timestamp enables us to distinguish two values created/returned by the same instruction (two values with the same origin) but at a different point in time.

    Such values may or may not be different (i.e., those value may or may not refer to the same object on the heap/stack).

    However, two domain values that have the same timestamp are guaranteed to refer to the same object at runtime (must-alias).

    Timestamps are required to determine changes in the memory layout. I.e., to determine if two values created by the same instruction are aliases or "just" maybe aliases. This information is particularly relevant if two values - stored in registers - are no longer guaranteed to be aliases!

  41. trait TypedValue[+T <: Type] extends Value with KnownType

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    Definition Classes
    ValuesDomain
  42. trait Value extends AnyRef

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    Abstracts over a concrete operand stack value or a value stored in one of the local variables/registers.

    Abstracts over a concrete operand stack value or a value stored in one of the local variables/registers.

    Use Of Value/Dependencies On Value

    In general, subclasses and users of a Domain should not have/declare a direct dependency on Value. Instead they should use DomainValue as otherwise extensibility of a Domain may be hampered or even be impossible. The only exceptions are, of course, classes that directly inherit from this class.

    Refining Value

    If you directly extend/refine this trait (i.e., in a subclass of the Domain trait you write something like trait Value extends super.Value), make sure that you also extend all classes/traits that inherit from this type (this may require a deep mixin composition and that you refine the type DomainType accordingly). However, OPAL was designed such that extending this class should – in general – not be necessary. It may also be easier to encode the desired semantics – as far as possible – as part of the domain.

    Implementing Value

    Standard inheritance from this trait is always supported and is the primary mechanism to model an abstract domain's lattice w.r.t. some special type of value. In general, the implementation should try to avoid creating new instances of values unless strictly required to model the domain's semantics. This will greatly improve the overall performance as this framework heavily uses reference-based equality checks to speed up the evaluation.

    Definition Classes
    ValuesDomain
    Note

    OPAL does not rely on any special equality semantics w.r.t. values and never directly or indirectly calls a Value's equals or eq method. Hence, a domain can encode equality such that it best fits its need. However, some of the provided domains rely on the following semantics for equals: Two domain values have to be equal (==) iff they represent the same information. This includes additional information, such as, the value of the origin. E.g., a value (AnIntegerValue) that represents an arbitrary Integer value has to return true if the domain value with which it is compared also represents an arbitrary Integer value (AnIntegerValue). However, it may still be necessary to use multiple objects to represent an arbitrary integer value if, e.g., constraints should be attached to specific values. For example, after a comparison of an integer value with a predefined value (e.g., AnIntegerValue < 4) it is possible to constrain the respective value on the subsequent paths (< 4 on one path and >= 4 on the other path). To make that possible, it is however necessary to distinguish the AnIntegervalue from some other AnIntegerValue to avoid constraining unrelated values.

    public void foo(int a,int b) {
        if(a < 4) {
            z = a - 2 // here a is constrained (< 4), b and z are unconstrained
        }
        else {
            z = a + 2 // here a is constrained (>= 4), b and z are unconstrained
        }
    }

    In general, equals is only defined for values belonging to the same domain. If values need to be compared across domains, they need to be adapted to a target domain first.

  43. trait ValueWithOriginInformation extends AnyRef

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    Definition Classes
    Origin

Abstract Value Members

  1. abstract val AReferenceValue: ClassTag[(ReferenceValues.this)#AReferenceValue]

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  2. abstract def ArithmeticException(origin: ValueOrigin): (ReferenceValues.this)#ExceptionValue

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    Creates a non-null object that represent a ArithmeticException and that has the given origin.

    Creates a non-null object that represent a ArithmeticException and that has the given origin. If the ArithmeticException was created by the VM while evaluating an instruction with the program counter pc you use the method ValueOriginForVMLevelValue to translate that pc to the appropriate ValueOrigin.

    Definition Classes
    ExceptionsFactory
  3. abstract def ArrayIndexOutOfBoundsException(origin: ValueOrigin): (ReferenceValues.this)#ExceptionValue

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    Creates a non-null object that represent a ArrayIndexOutOfBoundsException and that has the given origin.

    Creates a non-null object that represent a ArrayIndexOutOfBoundsException and that has the given origin. If the ArrayIndexOutOfBoundsException was created by the VM while evaluating an instruction with the program counter pc you use the method ValueOriginForVMLevelValue to translate that pc to the appropriate ValueOrigin.

    Definition Classes
    ExceptionsFactory
  4. abstract def ArrayStoreException(origin: ValueOrigin): (ReferenceValues.this)#ExceptionValue

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    Creates a non-null object that represent a ArrayStoreException and that has the given origin.

    Creates a non-null object that represent a ArrayStoreException and that has the given origin. If the ArrayStoreException was created by the VM while evaluating an instruction with the program counter pc you use the method ValueOriginForVMLevelValue to translate that pc to the appropriate ValueOrigin.

    Definition Classes
    ExceptionsFactory
  5. abstract def ArrayValue(pc: PC, isNull: Answer, isPrecise: Boolean, theUpperTypeBound: ArrayType, t: Int): (ReferenceValues.this)#DomainArrayValue

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    Attributes
    protected[org.opalj.ai.domain]
  6. abstract def ClassCastException(origin: ValueOrigin): (ReferenceValues.this)#ExceptionValue

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    Creates a non-null object that represent a ClassCastException and that has the given origin.

    Creates a non-null object that represent a ClassCastException and that has the given origin. If the ClassCastException was created by the VM while evaluating an instruction with the program counter pc you use the method ValueOriginForVMLevelValue to translate that pc to the appropriate ValueOrigin.

    Definition Classes
    ExceptionsFactory
  7. abstract def ClassNotFoundException(origin: ValueOrigin): (ReferenceValues.this)#ExceptionValue

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    Definition Classes
    ExceptionsFactory
  8. abstract val DomainArrayValue: ClassTag[(ReferenceValues.this)#DomainArrayValue]

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  9. abstract val DomainMultipleReferenceValues: ClassTag[(ReferenceValues.this)#DomainMultipleReferenceValues]

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  10. abstract val DomainNullValue: ClassTag[(ReferenceValues.this)#DomainNullValue]

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  11. abstract val DomainObjectValue: ClassTag[(ReferenceValues.this)#DomainObjectValue]

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  12. abstract val DomainReferenceValue: ClassTag[(ReferenceValues.this)#DomainReferenceValue]

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    The class tag can be used to create type safe arrays or to extract the concrete type of the domain value.

    The class tag can be used to create type safe arrays or to extract the concrete type of the domain value.

    val DomainReferenceValue(v) = value // of type "DomainValue"
    // v is now of the type DomainReferenceValue
    Definition Classes
    ValuesDomain
  13. abstract val DomainSingleOriginReferenceValue: ClassTag[(ReferenceValues.this)#DomainSingleOriginReferenceValue]

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  14. abstract def IllegalMonitorStateException(origin: ValueOrigin): (ReferenceValues.this)#ExceptionValue

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    Creates a non-null object that represent an IllegalMonitorStateException and that has the given origin.

    Creates a non-null object that represent an IllegalMonitorStateException and that has the given origin. If the IllegalMonitorStateException was created by the VM while evaluating an instruction with the program counter pc you should use the method ValueOriginForVMLevelValue to translate that pc to the appropriate ValueOrigin.

    Definition Classes
    ExceptionsFactory
  15. abstract def MultipleReferenceValues(values: UIDSet[(ReferenceValues.this)#DomainSingleOriginReferenceValue], isNull: Answer, isPrecise: Boolean, upperTypeBound: UIDSet[_ <: ReferenceType], t: Int): (ReferenceValues.this)#DomainMultipleReferenceValues

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    Attributes
    protected[org.opalj.ai.domain]
  16. abstract def MultipleReferenceValues(values: UIDSet[(ReferenceValues.this)#DomainSingleOriginReferenceValue]): (ReferenceValues.this)#DomainMultipleReferenceValues

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    Attributes
    protected[org.opalj.ai.domain]
  17. abstract def NegativeArraySizeException(origin: ValueOrigin): (ReferenceValues.this)#ExceptionValue

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    Creates a non-null object that represent a NegativeArraySizeException and that has the given origin.

    Creates a non-null object that represent a NegativeArraySizeException and that has the given origin. If the NegativeArraySizeException was created by the VM while evaluating an instruction with the program counter pc you use the method ValueOriginForVMLevelValue to translate that pc to the appropriate ValueOrigin.

    Definition Classes
    ExceptionsFactory
  18. abstract def NullPointerException(origin: ValueOrigin): (ReferenceValues.this)#ExceptionValue

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    Creates a non-null object that represent a NullPointerException and that has the given origin.

    Creates a non-null object that represent a NullPointerException and that has the given origin. If the NullPointerException was created by the VM while evaluating an instruction with the program counter pc you should use the method ValueOriginForVMLevelValue to translate that pc to the appropriate ValueOrigin.

    Definition Classes
    ExceptionsFactory
  19. abstract def NullValue(pc: PC): (ReferenceValues.this)#DomainNullValue

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    Factory method to create a DomainValue that represents value null and and that was created (explicitly or implicitly) by the instruction with the specified program counter.

    Factory method to create a DomainValue that represents value null and and that was created (explicitly or implicitly) by the instruction with the specified program counter.

    The domain may ignore the information about the value and the origin (pc).

    Summary

    The properties of the domain value are:

    • Initialized: N/A
    • Type: Null
    • Null: Yes
    Definition Classes
    TypeLevelReferenceValuesReferenceValuesFactory
  20. abstract def ObjectValue(pc: PC, isNull: Answer, upperTypeBound: UIDSet[ObjectType], t: Int): (ReferenceValues.this)#DomainObjectValue

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    Attributes
    protected[org.opalj.ai.domain]
  21. abstract def ObjectValue(pc: PC, isNull: Answer, isPrecise: Boolean, theUpperTypeBound: ObjectType, t: Int): (ReferenceValues.this)#DomainObjectValue

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    Attributes
    protected[org.opalj.ai.domain]
  22. abstract def Throwable(origin: ValueOrigin): (ReferenceValues.this)#ExceptionValue

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    Creates a non-null object that represent a Throwable object and that has the given origin.

    Creates a non-null object that represent a Throwable object and that has the given origin. If the Throwable was created by the VM while evaluating an instruction with the program counter pc you should use the method ValueOriginForVMLevelValue to translate that pc to the appropriate ValueOrigin.

    Definition Classes
    ExceptionsFactory
  23. abstract def isSubtypeOf(subtype: ReferenceType, supertype: ReferenceType): Answer

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    Tries to determine if the type referred to as subtype is a subtype of the specified reference type supertype.

    Tries to determine if the type referred to as subtype is a subtype of the specified reference type supertype. If the class hierarchy is not complete the answer may be Unknown.

    Definition Classes
    ReferenceValuesDomain

Concrete Value Members

  1. final def !=(arg0: Any): Boolean

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    Definition Classes
    AnyRef → Any
  2. final def ##(): Int

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    Definition Classes
    AnyRef → Any
  3. final def ==(arg0: Any): Boolean

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    Definition Classes
    AnyRef → Any
  4. def ArrayValue(pc: PC, arrayType: ArrayType): (ReferenceValues.this)#DomainArrayValue

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    Creates a new DomainValue that represents an array value with unknown values and where the specified type may also just be an upper type bound (unless the component type is a primitive type or an array of primitives.)

    Creates a new DomainValue that represents an array value with unknown values and where the specified type may also just be an upper type bound (unless the component type is a primitive type or an array of primitives.)

    Typical Usage

    This factory method is (typically) used to create a domain value that represents an array if we know nothing specific about the array. E.g., if you want to analyze a method that takes an array as a parameter.

    Summary

    The properties of the value are:

    • Type: Upper Bound (unless the elementType is a base type)
    • Null: Unknown
    • Size: Unknown
    • Content: Unknown
    Attributes
    protected[org.opalj.ai.domain]
    Definition Classes
    ReferenceValuesTypeLevelReferenceValues
    Note

    Java's arrays are co-variant. I.e., Object[] a = new Serializable[100]; is valid.

  5. object ArrayValue

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    Enables matching of DomainValues that are array values.

    Enables matching of DomainValues that are array values.

    Definition Classes
    DefaultTypeLevelReferenceValues
  6. def ClassValue(pc: PC, t: Type): (ReferenceValues.this)#DomainObjectValue

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    Factory method to create a DomainValue that represents a runtime value of type "Class<T>" and that was created by the instruction with the specified program counter.

    Factory method to create a DomainValue that represents a runtime value of type "Class<T>" and that was created by the instruction with the specified program counter.

    This function is called by OPAL when a class constant (LDC(_W) instruction) is put on the stack.

    The domain may ignore the information about the value and the origin (vo).

    Summary

    The properties of the domain value are:

    • Initialized: Yes and the type represented by the class is the given type.
    • Type: java.lang.Class<t:Type>
    • Null: No
    Definition Classes
    ReferenceValuesTypeLevelReferenceValuesReferenceValuesFactory
  7. implicit object DomainSingleOriginReferenceValueOrdering extends Ordering[(ReferenceValues.this)#DomainSingleOriginReferenceValue]

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    Defines a total order on reference values with a single origin by subtracting both origins.

  8. final val DomainValue: ClassTag[(ReferenceValues.this)#DomainValue]

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    The class tag for the type DomainValue.

    The class tag for the type DomainValue.

    Required to generate instances of arrays in which values of type DomainValue can be stored in a type-safe manner.

    Initialization

    In the sub-trait or class that fixes the type of DomainValue it is necessary to implement this abstract val using:

    val DomainValueTag : ClassTag[DomainValue] = implicitly

    (As of Scala 2.10 it is necessary that you do not use implicit in the subclass - it will compile, but fail at runtime.)

    Definition Classes
    DefaultDomainValueBindingValuesDomain
  9. def InitializedArrayValue(pc: PC, arrayType: ArrayType, counts: Chain[Int]): (ReferenceValues.this)#DomainArrayValue

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    Factory method to create a DomainValue that represents an array that was successfully created and which has the given type.

    Factory method to create a DomainValue that represents an array that was successfully created and which has the given type.

    The domain may ignore the information about the origin (pc) and the precise size of each dimension.

    Summary

    The properties of the domain value are:

    • Type: Precise
    • Null: No
    • Content: Unknown
    counts

    The size of each dimension if available. counts may not be empty but may not contain information about all dimensions; the following condition always has to hold: counts.length <= arrayType.dimensions.

    Definition Classes
    ReferenceValuesTypeLevelReferenceValuesReferenceValuesFactory
  10. def InitializedObjectValue(pc: PC, objectType: ObjectType): (ReferenceValues.this)#DomainObjectValue

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    Factory method to create a DomainValue that represents an initialized reference value of the given type and that was created (explicitly or implicitly) by the instruction with the specified program counter.

    Factory method to create a DomainValue that represents an initialized reference value of the given type and that was created (explicitly or implicitly) by the instruction with the specified program counter.

    General Remarks

    The given type usually identifies a class type (not an interface type) that is not abstract, but in some cases (e.g. consider java.awt.Toolkit()) it may be useful/meaningful to relax this requirement and to state that the class precisely represents the runtime type – even so the class is abstract. However, such decisions need to be made by the domain.

    This method is used by the OPAL framework to create reference values that are normally internally created by the JVM (in particular exceptions such as NullPointExeception and ClassCastException). However, it can generally be used to create initialized objects/arrays.

    Summary

    The properties of the domain value are:

    • Initialized: Yes
    • Type: precise (i.e., this type is not an upper bound, the type correctly models the runtime type.)
    • Null: No (This value is not null.)
    Definition Classes
    ReferenceValuesTypeLevelReferenceValuesReferenceValuesFactory
  11. object IsNull

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    Definition Classes
    TypeLevelReferenceValues
  12. object IsPrecise

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    Definition Classes
    TypeLevelReferenceValues
  13. object MObjectValue

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  14. final val MetaInformationUpdateIllegalValue: MetaInformationUpdate[(ReferenceValues.this)#DomainIllegalValue]

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    The result of the merge of two incompatible values has to be reported as a MetaInformationUpdate[DomainIllegalValue].

    The result of the merge of two incompatible values has to be reported as a MetaInformationUpdate[DomainIllegalValue].

    Definition Classes
    DefaultDomainValueBindingValuesDomain
  15. def MethodHandle(origin: ValueOrigin, handle: MethodHandle): (ReferenceValues.this)#DomainReferenceValue

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    Called by the AI framework for each load constant method handle (org.opalj.br.instructions.LoadMethodHandle) instruction to get a representation of/a DomainValue that represents the handle.

    Called by the AI framework for each load constant method handle (org.opalj.br.instructions.LoadMethodHandle) instruction to get a representation of/a DomainValue that represents the handle.

    handle

    A valid method handle.

    returns

    An InitializedObjectValue(ObjectType.MethodHandle). Hence, this method needs to be overridden if resolution of MethodHandle based method calls should be performed.

    Definition Classes
    ReferenceValuesFactory
  16. def MethodType(origin: ValueOrigin, descriptor: MethodDescriptor): (ReferenceValues.this)#DomainReferenceValue

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    Called by the framework for each load constant method type (org.opalj.br.instructions.LoadMethodType) instruction to get a domain-specific representation of the method descriptor as a MethodType.

    Called by the framework for each load constant method type (org.opalj.br.instructions.LoadMethodType) instruction to get a domain-specific representation of the method descriptor as a MethodType.

    descriptor

    A valid method descriptor.

    returns

    An InitializedObjectValue(ObjectType.MethodType). Hence, this method needs to be overridden if resolution of MethodType based method calls should be performed.

    Definition Classes
    ReferenceValuesFactory
  17. object MultipleReferenceValues

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  18. def NewArray(pc: PC, counts: (ReferenceValues.this)#Operands, arrayType: ArrayType): (ReferenceValues.this)#DomainArrayValue

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    Factory method to create a new domain value that represents a newly created array (non-null) with the size determined by count that is empty.

    Factory method to create a new domain value that represents a newly created array (non-null) with the size determined by count that is empty.

    Typical Usage

    This factory method is (implicitly) used, e.g., by OPAL when a multianewarray instruction is found.

    Summary

    The properties of the value are:

    • Type: Precise
    • Null: No
    • Size: Depending on the values in counts
    • Content: Empty (i.e., default values w.r.t. to the array's component type)
    Definition Classes
    ReferenceValuesTypeLevelReferenceValues
  19. def NewArray(pc: PC, count: (ReferenceValues.this)#DomainValue, arrayType: ArrayType): (ReferenceValues.this)#DomainArrayValue

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    Factory method to create a new domain value that represents a newly created array (non-null) with the size determined by count that is empty.

    Factory method to create a new domain value that represents a newly created array (non-null) with the size determined by count that is empty.

    Typical Usage

    This factory method is (implicitly) used, e.g., by OPAL when a newarray instruction is found.

    Summary

    The properties of the value are:

    • Type: Precise
    • Null: No
    • Size: Count
    • Content: Empty (i.e., default values w.r.t. to the array's component type)
    Definition Classes
    ReferenceValuesTypeLevelReferenceValues
  20. def NewObject(pc: PC, objectType: ObjectType): (ReferenceValues.this)#DomainObjectValue

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    Creates a new DomainValue that represents a new, uninitialized instance of an object of the given type.

    Creates a new DomainValue that represents a new, uninitialized instance of an object of the given type. The object was created by the (NEW) instruction with the specified program counter.

    OPAL calls this method when it evaluates newobject instructions. If the bytecode is valid a call of one of the object's constructors will subsequently initialize the object.

    Summary

    The properties of the domain value are:

    • Initialized: no (only the memory is allocated for the object)
    • Type: precise (i.e., this type is not an upper bound, the type correctly models the runtime type.)
    • Null: No (This value is not null.)
    Definition Classes
    ReferenceValuesTypeLevelReferenceValuesReferenceValuesFactory
    Note

    Instances of arrays are created by the newarray and multianewarray instructions and in both cases an exception may be thrown (e.g., NegativeArraySizeException).

  21. def NonNullObjectValue(pc: PC, objectType: ObjectType): (ReferenceValues.this)#DomainObjectValue

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    Represents a non-null reference value with the given type as an upper type bound.

    Represents a non-null reference value with the given type as an upper type bound.

    The domain may ignore the information about the value and the origin (vo).

    Summary

    The properties of the domain value are:

    • Initialized: Yes (the constructor was called)
    • Type: Upper Bound
    • Null: No (This value is not null.)
    Definition Classes
    ReferenceValuesTypeLevelReferenceValuesReferenceValuesFactory
  22. def ObjectValue(origin: ValueOrigin, isNull: Answer, isPrecise: Boolean, theUpperTypeBound: ObjectType): (ReferenceValues.this)#DomainObjectValue

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    Attributes
    protected[org.opalj.ai.domain]
  23. def ObjectValue(origin: ValueOrigin, isNull: Answer, upperTypeBound: UIDSet[ObjectType]): (ReferenceValues.this)#DomainObjectValue

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    Attributes
    protected[org.opalj.ai.domain]
  24. def ObjectValue(pc: PC, upperTypeBound: UIDSet[ObjectType]): (ReferenceValues.this)#DomainObjectValue

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    Factory method to create a DomainValue that represents either an class-/interface value that has the given types as an upper bound or the value null.

    Factory method to create a DomainValue that represents either an class-/interface value that has the given types as an upper bound or the value null. However, the information whether the value is null or not is not available. Furthermore, the type may also just be an upper bound and it is not known if the value is properly initialized.

    Summary

    The properties of the domain value are:

    • Initialized: Unknown (i.e., it is not guaranteed that the constructor was called.)
    • Type: Upper Bound
    • Null: Unknown
    • Content: Unknown
    Definition Classes
    ReferenceValuesTypeLevelReferenceValues
  25. def ObjectValue(pc: PC, objectType: ObjectType): (ReferenceValues.this)#DomainObjectValue

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    Factory method to create a DomainValue that represents either an class-/interface value that has the given type or the value null.

    Factory method to create a DomainValue that represents either an class-/interface value that has the given type or the value null. However, the information whether the value is null or not is not available. Furthermore, the type may also just be an upper bound and it is not known if the value is properly initialized.

    Summary

    The properties of the domain value are:

    • Initialized: Unknown
    • Type: Upper Bound
    • Null: Unknown
    • Content: Unknown
    Definition Classes
    ReferenceValuesTypeLevelReferenceValues
  26. final def ReferenceValue(origin: ValueOrigin, isNull: Answer, isPrecise: Boolean, upperTypeBound: UIDSet[_ <: ReferenceType], t: (ReferenceValues.this)#Timestamp): (ReferenceValues.this)#DomainSingleOriginReferenceValue

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    Attributes
    protected[org.opalj.ai.domain]
  27. final def ReferenceValue(origin: ValueOrigin, isNull: Answer, isPrecise: Boolean, theUpperTypeBound: ReferenceType): (ReferenceValues.this)#DomainSingleOriginReferenceValue

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    Attributes
    protected[org.opalj.ai.domain]
  28. def ReferenceValue(origin: ValueOrigin, isNull: Answer, isPrecise: Boolean, theUpperTypeBound: ReferenceType, t: (ReferenceValues.this)#Timestamp): (ReferenceValues.this)#DomainSingleOriginReferenceValue

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    Attributes
    protected[org.opalj.ai.domain]
  29. def ReferenceValue(pc: PC, upperTypeBound: ReferenceType): (ReferenceValues.this)#AReferenceValue

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    Factory method to create a DomainValue that represents either a reference value that has the given type and is initialized or the value null.

    Factory method to create a DomainValue that represents either a reference value that has the given type and is initialized or the value null. However, the information whether the value is null or not is not available. Furthermore, the type may also just be an upper bound.

    The domain may ignore the information about the value and the origin, but it has to remain possible for the domain to identify the component type of an array.

    Summary

    The properties of the domain value are:

    • Initialized: Yes (if non-null the constructor was called/the array was initialized)
    • Type: Upper Bound
    • Null: Unknown
    • Content: Unknown
    Definition Classes
    TypeLevelReferenceValuesReferenceValuesFactory
  30. final def ReturnAddressValue(address: Int): (ReferenceValues.this)#ReturnAddressValue

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    Factory method to create an instance of a ReturnAddressValue.

    Factory method to create an instance of a ReturnAddressValue.

    Definition Classes
    DefaultDomainValueBindingValuesDomain
  31. object SObjectValue

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  32. implicit object SingleOriginValueOrdering extends Ordering[(Origin.this)#SingleOriginValue]

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    Definition Classes
    Origin
  33. def StringValue(pc: PC, value: String): (ReferenceValues.this)#DomainObjectValue

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    Factory method to create a DomainValue that represents the given string value and that was created by the instruction with the specified program counter.

    Factory method to create a DomainValue that represents the given string value and that was created by the instruction with the specified program counter.

    This function is called by OPAL-AI when a string constant (LDC(_W) instruction) is put on the stack.

    The domain may ignore the information about the value and the origin (vo).

    Summary

    The properties of the domain value are:

    • Initialized: Yes and the String's value is the given value. The string may be empty (""), but it is never null.
    • Type: java.lang.String
    • Null: No
    value

    A non-null string. (The string may be empty, though.)

    Definition Classes
    ReferenceValuesTypeLevelReferenceValuesReferenceValuesFactory
  34. final def StructuralUpdateIllegalValue: StructuralUpdate[Nothing]

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    The result of merging two values should never be reported as a StructuralUpdate if the computed value is an IllegalValue.

    The result of merging two values should never be reported as a StructuralUpdate if the computed value is an IllegalValue. The JVM semantics guarantee that the value will not be used and, hence, continuing the interpretation is meaningless.

    Definition Classes
    ValuesDomain
    Note

    This method is solely defined for documentation purposes and to catch implementation errors early on.

  35. object T

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    Extractor for timestamps.

  36. final val TheIllegalValue: (ReferenceValues.this)#DomainIllegalValue

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    The singleton instance of the IllegalValue.

    The singleton instance of the IllegalValue.

    Definition Classes
    DefaultDomainValueBindingValuesDomain
  37. final val TheReturnAddressValues: (ReferenceValues.this)#ReturnAddressValues

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    The singleton instance of ReturnAddressValues

    The singleton instance of ReturnAddressValues

    Definition Classes
    DefaultDomainValueBindingValuesDomain
  38. final def TimestampUpdate[T](value: T): MetaInformationUpdate[T]

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    Creates an update object that characterizes a timestamp update.

    Creates an update object that characterizes a timestamp update.

    Basically, just a wrapper for a MetaInformationUpdate; the purpose is to better communicate the underlying purpose.

    Annotations
    @inline()
  39. object UpperTypeBound

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    Definition Classes
    TypeLevelReferenceValues
  40. final def VMArithmeticException(pc: PC): (ReferenceValues.this)#ExceptionValue

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    Definition Classes
    ExceptionsFactory
  41. final def VMArrayIndexOutOfBoundsException(pc: PC): (ReferenceValues.this)#ExceptionValue

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    Definition Classes
    ExceptionsFactory
  42. final def VMArrayStoreException(pc: PC): (ReferenceValues.this)#ExceptionValue

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    Definition Classes
    ExceptionsFactory
  43. final def VMClassCastException(pc: PC): (ReferenceValues.this)#ExceptionValue

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    Definition Classes
    ExceptionsFactory
  44. final def VMClassNotFoundException(pc: PC): (ReferenceValues.this)#ExceptionValue

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    Definition Classes
    ExceptionsFactory
  45. final def VMIllegalMonitorStateException(pc: PC): (ReferenceValues.this)#ExceptionValue

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    Definition Classes
    ExceptionsFactory
  46. final def VMNegativeArraySizeException(pc: PC): (ReferenceValues.this)#ExceptionValue

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    Definition Classes
    ExceptionsFactory
  47. final def VMNullPointerException(pc: PC): (ReferenceValues.this)#ExceptionValue

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    Definition Classes
    ExceptionsFactory
  48. final def VMThrowable(pc: PC): (ReferenceValues.this)#ExceptionValue

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    Definition Classes
    ExceptionsFactory
  49. def aaload(pc: PC, index: (ReferenceValues.this)#DomainValue, arrayref: (ReferenceValues.this)#DomainValue): (ReferenceValues.this)#ArrayLoadResult

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  50. def aastore(pc: PC, value: (ReferenceValues.this)#DomainValue, index: (ReferenceValues.this)#DomainValue, arrayref: (ReferenceValues.this)#DomainValue): (ReferenceValues.this)#ArrayStoreResult

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  51. def arraylength(pc: PC, arrayref: (ReferenceValues.this)#DomainValue): Computation[(ReferenceValues.this)#DomainValue, (ReferenceValues.this)#ExceptionValue]

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    Returns the array's length or throws a NullPointerException if the given reference is null.

    Returns the array's length or throws a NullPointerException if the given reference is null.

    Definition Classes
    TypeLevelReferenceValuesReferenceValuesDomain
    Note

    It is in general not necessary to override this method. If you need some special handling refine the trait ArrayValue.

  52. def arrayload(pc: PC, index: (ReferenceValues.this)#DomainValue, arrayref: (ReferenceValues.this)#DomainValue): (ReferenceValues.this)#ArrayLoadResult

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    Loads the value stored in the array at the given index or throws an exception (NullPointerException or IndexOutOfBoundsException).

    Loads the value stored in the array at the given index or throws an exception (NullPointerException or IndexOutOfBoundsException).

    Definition Classes
    TypeLevelReferenceValuesGeneralizedArrayHandling
    Note

    It is in general not necessary to override this method. If you need some special handling refine the load method defined by the trait ArrayValue.

  53. def arraystore(pc: PC, value: (ReferenceValues.this)#DomainValue, index: (ReferenceValues.this)#DomainValue, arrayref: (ReferenceValues.this)#DomainValue): (ReferenceValues.this)#ArrayStoreResult

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    Stores the given value in the array at the given index or throws an exception (NullPointerException, ArrayStoreException or IndexOutOfBoundsException).

    Stores the given value in the array at the given index or throws an exception (NullPointerException, ArrayStoreException or IndexOutOfBoundsException).

    Definition Classes
    TypeLevelReferenceValuesGeneralizedArrayHandling
    Note

    It is in general not necessary to override this method. If you need some special handling refine the store method defined by the trait ArrayValue.

  54. def asArrayAbstraction(value: (ReferenceValues.this)#DomainValue): (ReferenceValues.this)#ArrayAbstraction

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    Definition Classes
    TypeLevelReferenceValues
  55. final def asInstanceOf[T0]: T0

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    Definition Classes
    Any
  56. def asObjectValue(value: (ReferenceValues.this)#DomainValue): (ReferenceValues.this)#DomainObjectValue

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    Definition Classes
    TypeLevelReferenceValues
  57. def asReferenceValue(value: (ReferenceValues.this)#DomainValue): (ReferenceValues.this)#AReferenceValue

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    Returns the given value as a DomainReferenceValue.

    Returns the given value as a DomainReferenceValue. Basically just performs a type cast and is intended to be used to communicate that the value has to be a reference value (if the underlying byte code is valid.)

    Definition Classes
    TypeLevelReferenceValues
  58. def baload(pc: PC, index: (ReferenceValues.this)#DomainValue, arrayref: (ReferenceValues.this)#DomainValue): (ReferenceValues.this)#ArrayLoadResult

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  59. def bastore(pc: PC, value: (ReferenceValues.this)#DomainValue, index: (ReferenceValues.this)#DomainValue, arrayref: (ReferenceValues.this)#DomainValue): (ReferenceValues.this)#ArrayStoreResult

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  60. def caload(pc: PC, index: (ReferenceValues.this)#DomainValue, arrayref: (ReferenceValues.this)#DomainValue): (ReferenceValues.this)#ArrayLoadResult

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  61. def castore(pc: PC, value: (ReferenceValues.this)#DomainValue, index: (ReferenceValues.this)#DomainValue, arrayref: (ReferenceValues.this)#DomainValue): (ReferenceValues.this)#ArrayStoreResult

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  62. def clone(): AnyRef

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    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  63. def daload(pc: PC, index: (ReferenceValues.this)#DomainValue, arrayref: (ReferenceValues.this)#DomainValue): (ReferenceValues.this)#ArrayLoadResult

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  64. def dastore(pc: PC, value: (ReferenceValues.this)#DomainValue, index: (ReferenceValues.this)#DomainValue, arrayref: (ReferenceValues.this)#DomainValue): (ReferenceValues.this)#ArrayStoreResult

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  65. final def eq(arg0: AnyRef): Boolean

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    Definition Classes
    AnyRef
  66. def equals(arg0: Any): Boolean

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    Definition Classes
    AnyRef → Any
  67. def faload(pc: PC, index: (ReferenceValues.this)#DomainValue, arrayref: (ReferenceValues.this)#DomainValue): (ReferenceValues.this)#ArrayLoadResult

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  68. def fastore(pc: PC, value: (ReferenceValues.this)#DomainValue, index: (ReferenceValues.this)#DomainValue, arrayref: (ReferenceValues.this)#DomainValue): (ReferenceValues.this)#ArrayStoreResult

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  69. def finalize(): Unit

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    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( classOf[java.lang.Throwable] )
  70. def foreachOrigin(value: (ReferenceValues.this)#DomainValue, f: (ValueOrigin) ⇒ Unit): Unit

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    Definition Classes
    Origin
  71. final def getClass(): Class[_]

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    Definition Classes
    AnyRef → Any
  72. def hashCode(): Int

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    Definition Classes
    AnyRef → Any
  73. def iaload(pc: PC, index: (ReferenceValues.this)#DomainValue, arrayref: (ReferenceValues.this)#DomainValue): (ReferenceValues.this)#ArrayLoadResult

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  74. def iastore(pc: PC, value: (ReferenceValues.this)#DomainValue, index: (ReferenceValues.this)#DomainValue, arrayref: (ReferenceValues.this)#DomainValue): (ReferenceValues.this)#ArrayStoreResult

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  75. final def isInstanceOf[T0]: Boolean

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    Definition Classes
    Any
  76. def isNull(values: Iterable[(ReferenceValues.this)#AReferenceValue]): Answer

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    Determines the common null-ness property of the given reference values.

    Determines the common null-ness property of the given reference values.

    Attributes
    protected
  77. def isPrecise(values: Iterable[(ReferenceValues.this)#AReferenceValue]): Boolean

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    Determines if the runtime object type referred to by the given values is always the same.

    Determines if the runtime object type referred to by the given values is always the same. I.e., it determines if all values are precise and have the same upperTypeBound. Null values are ignored when determining the precision.

    Attributes
    protected
  78. final def isValueSubtypeOf(value: (ReferenceValues.this)#DomainValue, supertype: ReferenceType): Answer

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    Tries to determine – under the assumption that the given value is not null – if the runtime type of the given reference value could be a subtype of the specified reference type supertype.

    Tries to determine – under the assumption that the given value is not null – if the runtime type of the given reference value could be a subtype of the specified reference type supertype. I.e., if the type of the value is not precisely known, then all subtypes of the value's type are also taken into consideration when analyzing the subtype relation and only if we can guarantee that none is a subtype of the given supertype the answer will be No.

    Definition Classes
    TypeLevelReferenceValuesReferenceValuesDomain
    Note

    The returned value is only meaningful if value does not represent the runtime value null.

  79. final def justThrows(value: (ReferenceValues.this)#ExceptionValue): ThrowsException[(ReferenceValues.this)#ExceptionValues]

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    Definition Classes
    ReferenceValuesFactory
  80. def laload(pc: PC, index: (ReferenceValues.this)#DomainValue, arrayref: (ReferenceValues.this)#DomainValue): (ReferenceValues.this)#ArrayLoadResult

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  81. def lastore(pc: PC, value: (ReferenceValues.this)#DomainValue, index: (ReferenceValues.this)#DomainValue, arrayref: (ReferenceValues.this)#DomainValue): (ReferenceValues.this)#ArrayStoreResult

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  82. def mergeDEComputations(pc: PC, c1: Computation[(ReferenceValues.this)#DomainValue, (ReferenceValues.this)#ExceptionValue], c2: Computation[(ReferenceValues.this)#DomainValue, (ReferenceValues.this)#ExceptionValue]): Computation[(ReferenceValues.this)#DomainValue, (ReferenceValues.this)#ExceptionValue]

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    Merges two computations that both resulted in at most one DomainValue or at most one ExceptionValue.

    Merges two computations that both resulted in at most one DomainValue or at most one ExceptionValue.

    If values are merged the merged value will use the specified pc.

    Attributes
    protected[this]
    Definition Classes
    TypeLevelReferenceValues
  83. def mergeDEsComputations(pc: PC, c1: Computation[(ReferenceValues.this)#DomainValue, (ReferenceValues.this)#ExceptionValues], c2: Computation[(ReferenceValues.this)#DomainValue, (ReferenceValues.this)#ExceptionValues]): Computation[(ReferenceValues.this)#DomainValue, (ReferenceValues.this)#ExceptionValues]

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    Merges two computations that both return some DomainValue and some ExceptionValues.

    Merges two computations that both return some DomainValue and some ExceptionValues. If values are merged the merged value will use the specified pc.

    Attributes
    protected[this]
    Definition Classes
    TypeLevelReferenceValues
  84. def mergeDomainValues(pc: PC, v1: (ReferenceValues.this)#DomainValue, v2: (ReferenceValues.this)#DomainValue): (ReferenceValues.this)#DomainValue

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    Merges the given domain value v1 with the domain value v2 and returns the merged value which is v1 if v1 is an abstraction of v2, v2 if v2 is an abstraction of v1 or some other value if a new value is computed that abstracts over both values.

    Merges the given domain value v1 with the domain value v2 and returns the merged value which is v1 if v1 is an abstraction of v2, v2 if v2 is an abstraction of v1 or some other value if a new value is computed that abstracts over both values.

    This operation is commutative.

    Definition Classes
    ValuesDomain
  85. def mergeEsComputations(pc: PC, c1: Computation[Nothing, (ReferenceValues.this)#ExceptionValues], c2: Computation[Nothing, (ReferenceValues.this)#ExceptionValues]): Computation[Nothing, (ReferenceValues.this)#ExceptionValues]

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    Merges two computations that both resulted in at most one ExceptionValue each.

    Merges two computations that both resulted in at most one ExceptionValue each.

    If values are merged the merged value will use the specified pc.

    Attributes
    protected[this]
    Definition Classes
    TypeLevelReferenceValues
  86. def mergeMultipleExceptionValues(pc: PC, v1s: (ReferenceValues.this)#ExceptionValues, v2s: (ReferenceValues.this)#ExceptionValues): (ReferenceValues.this)#ExceptionValues

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    Merges those exceptions that have the same upper type bound.

    Merges those exceptions that have the same upper type bound. This ensures that per upper type bound only one ValuesDomain.DomainValue (which may be a MultipleReferenceValues) is used. For those values that are merged, the given pc is used.

    Definition Classes
    TypeLevelReferenceValues
  87. def multianewarray(pc: PC, counts: (ReferenceValues.this)#Operands, arrayType: ArrayType): Computation[(ReferenceValues.this)#DomainArrayValue, (ReferenceValues.this)#ExceptionValue]

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    Creates a multi-dimensional array.

    Creates a multi-dimensional array.

    Definition Classes
    TypeLevelReferenceValuesReferenceValuesDomain
    Note

    It is generally not necessary to override this method as it handles all cases in a generic manner.

    ,

    The componentType may be (again) an array type.

  88. final def ne(arg0: AnyRef): Boolean

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    Definition Classes
    AnyRef
  89. def newarray(pc: PC, count: (ReferenceValues.this)#DomainValue, componentType: FieldType): Computation[(ReferenceValues.this)#DomainValue, (ReferenceValues.this)#ExceptionValue]

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    Creates a new array.

    Creates a new array.

    Definition Classes
    TypeLevelReferenceValuesReferenceValuesDomain
    Note

    It is generally not necessary to override this method as it handles all cases in a generic manner.

  90. def nextT(): (ReferenceValues.this)#Timestamp

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    Returns the next unused time stamp.

  91. final def notify(): Unit

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    Definition Classes
    AnyRef
  92. final def notifyAll(): Unit

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    Definition Classes
    AnyRef
  93. final def nullT: (ReferenceValues.this)#Timestamp

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  94. def origin(value: (ReferenceValues.this)#DomainValue): Iterable[ValueOrigin]

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    Returns the origin(s) of the given value if the information is available.

    Returns the origin(s) of the given value if the information is available.

    returns

    The source(s) of the given value if the information is available. Whether the information is available depends on the concrete domains. This trait only defines a general contract how to get access to a value's origin (I.e., the origin of the instruction which created the respective value.) By default this method returns an empty Iterable.

    Definition Classes
    Origin
  95. def properties(pc: PC, propertyToString: (AnyRef) ⇒ String = (v) ⇒ v.toString): Option[String]

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    Returns a string representation of the properties associated with the instruction with the respective program counter.

    Returns a string representation of the properties associated with the instruction with the respective program counter.

    Associating properties with an instruction and maintaining those properties is, however, at the sole responsibility of the Domain.

    This method is predefined to facilitate the development of support tools and is not used by the abstract interpretation framework.

    Domains that define (additional) properties should (abstract) override this method and should return a textual representation of the property.

    Definition Classes
    ValuesDomain
  96. def refAreEqual(pc: PC, v1: (ReferenceValues.this)#DomainValue, v2: (ReferenceValues.this)#DomainValue): Answer

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    Returns Yes if both DomainReferenceValues definitively identify the same object at runtime.

    Returns Yes if both DomainReferenceValues definitively identify the same object at runtime.

    Using this domain, it is in general not possible to determine that two values are definitively not reference equal unless they are type incompatible.

    Definition Classes
    ReferenceValuesTypeLevelReferenceValuesReferenceValuesDomain
  97. def refAreNotEqual(pc: PC, value1: (ReferenceValues.this)#DomainValue, value2: (ReferenceValues.this)#DomainValue): Answer

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    Compares the given values for reference inequality.

    Compares the given values for reference inequality. Returns No if both values point to the same instance and returns Yes if both objects are known not to point to the same instance. The latter is, e.g., trivially the case when both values have a different concrete type. Otherwise Unknown is returned.

    If both values are representing the null value the org.opalj.Answer is Yes.

    value1

    A value of computational type reference.

    value2

    A value of computational type reference.

    Definition Classes
    ReferenceValuesDomain
  98. def refEstablishAreEqual(pc: PC, value1: (ReferenceValues.this)#DomainValue, value2: (ReferenceValues.this)#DomainValue, operands: (ReferenceValues.this)#Operands, locals: (ReferenceValues.this)#Locals): ((ReferenceValues.this)#Operands, (ReferenceValues.this)#Locals)

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    Called by OPAL when two values were compared for reference equality and we are going to analyze the branch where the comparison succeeded.

    Called by OPAL when two values were compared for reference equality and we are going to analyze the branch where the comparison succeeded.

    Definition Classes
    ReferenceValuesDomain
  99. def refEstablishAreNotEqual(pc: PC, value1: (ReferenceValues.this)#DomainValue, value2: (ReferenceValues.this)#DomainValue, operands: (ReferenceValues.this)#Operands, locals: (ReferenceValues.this)#Locals): ((ReferenceValues.this)#Operands, (ReferenceValues.this)#Locals)

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    Called by OPAL when two values were compared for reference equality and we are going to analyze the branch where the comparison failed.

    Called by OPAL when two values were compared for reference equality and we are going to analyze the branch where the comparison failed.

    Definition Classes
    ReferenceValuesDomain
  100. def refEstablishIsNonNull(pc: PC, value: (ReferenceValues.this)#DomainValue, operands: (ReferenceValues.this)#Operands, locals: (ReferenceValues.this)#Locals): ((ReferenceValues.this)#Operands, (ReferenceValues.this)#Locals)

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    Refines the "null"ness property (isNull == No) of the given value.

    Refines the "null"ness property (isNull == No) of the given value.

    Calls refineIsNull on the given ReferenceValue and replaces every occurrence on the stack/in a register with the updated value.

    value

    A ReferenceValue that does not represent the value null.

    Definition Classes
    ReferenceValuesReferenceValuesDomain
  101. def refEstablishIsNull(pc: PC, value: (ReferenceValues.this)#DomainValue, operands: (ReferenceValues.this)#Operands, locals: (ReferenceValues.this)#Locals): ((ReferenceValues.this)#Operands, (ReferenceValues.this)#Locals)

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    Updates the "null"ness property (isNull == Yes) of the given value.

    Updates the "null"ness property (isNull == Yes) of the given value.

    Calls refineIsNull on the given ReferenceValue and replaces every occurrence on the stack/in a register with the updated value.

    value

    A ReferenceValue.

    Definition Classes
    ReferenceValuesReferenceValuesDomain
  102. def refIsNonNull(pc: PC, value: (ReferenceValues.this)#DomainValue): Answer

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    Returns Yes if given value is never null, Unknown if the values is maybe null and No otherwise.

    Returns Yes if given value is never null, Unknown if the values is maybe null and No otherwise.

    value

    A value of computational type reference.

    Definition Classes
    ReferenceValuesDomain
  103. final def refIsNull(pc: PC, value: (ReferenceValues.this)#DomainValue): Answer

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    Determines the nullness-property of the given value.

    Determines the nullness-property of the given value.

    value

    A value of type ReferenceValue.

    Definition Classes
    TypeLevelReferenceValuesReferenceValuesDomain
  104. def refSetUpperTypeBoundOfTopOperand(pc: PC, bound: ReferenceType, operands: (ReferenceValues.this)#Operands, locals: (ReferenceValues.this)#Locals): ((ReferenceValues.this)#Operands, (ReferenceValues.this)#Locals)

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    Called by the abstract interpreter when the type bound of the top most stack value needs to be refined.

    Called by the abstract interpreter when the type bound of the top most stack value needs to be refined. This method is only called by the abstract interpreter iff an immediately preceding subtype query (typeOf(value) <: bound) returned Unknown. This method must not be ignored – w.r.t. refining the top-most stack value; it is e.g., used by org.opalj.br.instructions.CHECKCAST instructions.

    A domain that is able to identify aliases can use this information to propagate the information to the other aliases.

    Definition Classes
    ReferenceValuesTypeLevelReferenceValuesReferenceValuesDomain
  105. def refTopOperandIsNull(pc: PC, operands: (ReferenceValues.this)#Operands, locals: (ReferenceValues.this)#Locals): ((ReferenceValues.this)#Operands, (ReferenceValues.this)#Locals)

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    Sets the is null property of the top-most stack value to Yes.

    Sets the is null property of the top-most stack value to Yes. This method is called by the framework when the top-most operand stack value has to be null, but a previous isNull check returned Unknown. E.g., after a org.opalj.br.instructions.CHECKCAST that fails unless the value is "null".

    This method can be ignored; i.e., the return value can be (operands,locals). However, a domain that is able to identify aliases can use this information to propagate the information to the other aliases.

    Definition Classes
    ReferenceValuesTypeLevelReferenceValuesReferenceValuesDomain
  106. def refineIsNull(pc: PC, value: (ReferenceValues.this)#DomainValue, isNull: Answer, operands: (ReferenceValues.this)#Operands, locals: (ReferenceValues.this)#Locals): ((ReferenceValues.this)#Operands, (ReferenceValues.this)#Locals)

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    Attributes
    protected[this]
  107. def saload(pc: PC, index: (ReferenceValues.this)#DomainValue, arrayref: (ReferenceValues.this)#DomainValue): (ReferenceValues.this)#ArrayLoadResult

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  108. def sastore(pc: PC, value: (ReferenceValues.this)#DomainValue, index: (ReferenceValues.this)#DomainValue, arrayref: (ReferenceValues.this)#DomainValue): (ReferenceValues.this)#ArrayStoreResult

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  109. def summarize(pc: PC, values: Iterable[(ReferenceValues.this)#DomainValue]): (ReferenceValues.this)#DomainValue

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    Creates a summary of the given domain values by summarizing and joining the given values.

    Creates a summary of the given domain values by summarizing and joining the given values. For the precise details regarding the calculation of a summary see Value.summarize(...).

    pc

    The program counter that will be used for the summary value if a new value is returned that abstracts over/summarizes the given values.

    values

    An Iterable over one or more values.

    Definition Classes
    ValuesDomain
    Note

    The current algorithm is generic and should satisfy most needs, but it is not very efficient. However, it should be easy to tailor it for a specific domain/domain values, if need be.

  110. final def synchronized[T0](arg0: ⇒ T0): T0

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    Definition Classes
    AnyRef
  111. final def throws(value: (ReferenceValues.this)#ExceptionValue): ThrowsException[(ReferenceValues.this)#ExceptionValue]

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    Definition Classes
    ReferenceValuesFactory
  112. def toJavaObject(pc: PC, value: (ReferenceValues.this)#DomainValue): Option[AnyRef]

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    Converts – if possible – a given DomainValue to a Java object that is appropriately initialized.

    Converts – if possible – a given DomainValue to a Java object that is appropriately initialized.

    Implementation

    Every domain that supports the creation of a Java object's based on a domain value is expected to implement this method and to test if it can create a precise representation of the given value. If not, the implementation has to delegate the responsibility to the super method to creat an abstract representation.

    abstract override def toJavaObject(value : DomainValue): Option[Object] = {
     if(value...)
         // create and return Java object
     else
         super.toJavaObject(value)
    }
    returns

    Some(Object) is returned if it was possible to create a compatible corresponding Java object; otherwise None is returned. Default: None unless the value is null. In the latter case Some(null) is returned.

    Definition Classes
    ReferenceValuesTypeLevelReferenceValuesAsJavaObject
    Note

    This operation is generally only possible if the domain value maintains enough state information to completely initialize the Java object.

  113. def toString(): String

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    Definition Classes
    AnyRef → Any
  114. def typeOfValue(value: (ReferenceValues.this)#DomainValue): TypeInformation

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    Returns the type(type bounds) of the given value.

    Returns the type(type bounds) of the given value.

    In general a single value can have multiple type bounds which depend on the control flow. However, all types that the value represents must belong to the same computational type category. I.e., it is possible that the value either has the type "NullPointerException or IllegalArgumentException", but it will never have – at the same time – the (Java) types int and long. Furthermore, it is possible that the returned type(s) is(are) only an upper bound of the real type unless the type is a primitive type.

    This default implementation always returns org.opalj.ai.UnknownType.

    Implementing typeOfValue

    This method is typically not implemented by a single Domain trait/object, but is instead implemented collaboratively by all domains that implement the semantics of certain values. To achieve that, other Domain traits that implement a concrete domain's semantics have to abstract override this method and only return the value's type if the domain knows anything about the type. If a method that overrides this method has no knowledge about the given value, it should delegate this call to its super method.

    Example

    trait FloatValues extends Domain[...] {
      ...
        abstract override def typeOfValue(value: DomainValue): TypesAnswer =
        value match {
          case r: FloatValue ⇒ IsFloatValue
          case _             ⇒ super.typeOfValue(value)
        }
    }
    Definition Classes
    ValuesDomain
  115. def upperTypeBound(theValues: UIDSet[(ReferenceValues.this)#DomainSingleOriginReferenceValue]): UIDSet[_ <: ReferenceType]

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    Calculates the most specific common upper type bound of the upper type bounds of all values.

    Calculates the most specific common upper type bound of the upper type bounds of all values. NullValues are ignored.

  116. final def wait(): Unit

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    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  117. final def wait(arg0: Long, arg1: Int): Unit

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    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  118. final def wait(arg0: Long): Unit

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    Definition Classes
    AnyRef
    Annotations
    @throws( ... )

Inherited from Origin

Inherited from TypeLevelReferenceValues

Inherited from AsJavaObject

Inherited from GeneralizedArrayHandling

Inherited from ReferenceValuesDomain

Inherited from ReferenceValuesFactory

Inherited from ExceptionsFactory

Inherited from DefaultDomainValueBinding

Inherited from ValuesDomain

Inherited from AnyRef

Inherited from Any

Ungrouped