Packages

  • package root
    Definition Classes
    root
  • package org
    Definition Classes
    root
  • package opalj

    OPAL is a Scala-based framework for the static analysis, manipulation and creation of Java bytecode.

    OPAL is a Scala-based framework for the static analysis, manipulation and creation of Java bytecode. OPAL is designed with performance, scalability and adaptability in mind.

    Its main components are:

    • a library (Common) which provides generally useful data-structures and algorithms for static analyses.
    • a framework for implementing lattice based static analyses (Static Analysis Infrastructure)
    • a framework for parsing Java bytecode (Bytecode Infrastructure) that can be used to create arbitrary representations.
    • a library to create a one-to-one in-memory representation of Java bytecode (Bytecode Disassembler).
    • a library to create a representation of Java bytecode that facilitates writing simple static analyses (Bytecode Representation - org.opalj.br).
    • a scalable, easily customizable framework for the abstract interpretation of Java bytecode (Abstract Interpretation Framework - org.opalj.ai).
    • a library to extract dependencies between code elements and to facilitate checking architecture definitions.
    • a library for the lightweight manipulation and creation of Java bytecode (Bytecode Assembler).

    General Design Decisions

    Thread Safety

    Unless explicitly noted, OPAL is thread safe. I.e., the classes defined by OPAL can be considered to be thread safe unless otherwise stated. (For example, it is possible to read and process class files concurrently without explicit synchronization on the client side.)

    No null Values

    Unless explicitly noted, OPAL does not null values I.e., fields that are accessible will never contain null values and methods will never return null. If a method accepts null as a value for a parameter or returns a null value it is always explicitly documented. In general, the behavior of methods that are passed null values is undefined unless explicitly documented.

    No Typecasts for Collections

    For efficiency reasons, OPAL sometimes uses mutable data-structures internally. After construction time, these data-structures are generally represented using their generic interfaces (e.g., scala.collection.{Set,Map}). However, a downcast (e.g., to add/remove elements) is always forbidden as it would effectively prevent thread-safety.

    Assertions

    OPAL makes heavy use of Scala's Assertion Facility to facilitate writing correct code. Hence, for production builds (after thorough testing(!)) it is highly recommend to build OPAL again using -Xdisable-assertions.

    Definition Classes
    org
  • package ai

    Implementation of an abstract interpretation (ai) framework – also referred to as OPAL.

    Implementation of an abstract interpretation (ai) framework – also referred to as OPAL.

    Please note that OPAL/the abstract interpreter just refers to the classes and traits defined in this package (ai). The classes and traits defined in the sub-packages (in particular in domain) are not considered to be part of the core of OPAL/the abstract interpreter.

    Definition Classes
    opalj
    Note

    This framework assumes that the analyzed bytecode is valid; i.e., the JVM's bytecode verifier would be able to verify the code. Furthermore, load-time errors (e.g., LinkageErrors) are – by default – completely ignored to facilitate the analysis of parts of a project. In general, if the presented bytecode is not valid, the result is undefined (i.e., OPAL may report meaningless results, crash or run indefinitely).

    See also

    org.opalj.ai.AI - Implements the abstract interpreter that processes a methods code and uses an analysis-specific domain to perform the abstract computations.

    org.opalj.ai.Domain - The core interface between the abstract interpretation framework and the abstract domain that is responsible for performing the abstract computations.

  • package domain

    This package contains definitions of common domains that can be used for the implementation of analyses.

    This package contains definitions of common domains that can be used for the implementation of analyses.

    Types of Domains

    In general, we distinguish two types of domains. First, domains that define a general interface (on top of the one defined by Domain), but do not directly provide an implementation. Hence, whenever you develop a new Domain you should consider implementing/using these domains to maximize reusability. Second, Domains that implement a specific interface (trait). In this case, we further distinguish between domains that provide a default implementation (per interface only one of these Domains can be used to create a final Domain) and those that can be stacked and basically refine the overall functionality.

    Examples

    • Domains That Define a General Interface
      • Origin defines two types which domains that provide information abou the origin of a value should consider to implement.
      • TheProject defines a standard mechanism how a domain can access the current project.
      • ...
    • Domains That Provide a Default Implementation
    • Domains That Implement Stackable Functionality
      • org.opalj.ai.domain.RecordThrownExceptions records information about all uncaught exceptions by intercepting a Domain's respective methods. However, it does provide a default implementation. Hence, a typical pattern is:
    class MyDomain extends Domain with ...
        with DefaultHandlingOfMethodResults with RecordThrownExceptions

    Thread Safety

    Unless explicitly documented, a domain is never thread-safe. The general programming model is to use one Domain object per code block/method and therefore, thread-safety is not required for Domains that are used for the evaluation of methods. However domains that are used to adapt/transfer values should be thread safe (see org.opalj.ai.domain.ValuesCoordinatingDomain for further details).

    Definition Classes
    ai
  • package l1

    Commonly useful methods.

    Commonly useful methods.

    Definition Classes
    domain
  • ArrayValues
  • ClassValues
  • ConcreteArrayValues
  • ConcretePrimitiveValuesConversions
  • ConstraintsBetweenIntegerValues
  • DefaultArrayValuesBinding
  • DefaultClassValuesBinding
  • DefaultConcreteArrayValuesBinding
  • DefaultDomain
  • DefaultDomainWithCFG
  • DefaultDomainWithCFGAndDefUse
  • DefaultIntegerRangeValues
  • DefaultIntegerSetValues
  • DefaultIntegerValues
  • DefaultIntervalValuesDomain
  • DefaultJavaObjectToDomainValueConversion
  • DefaultLongSetValues
  • DefaultLongValues
  • DefaultReferenceValuesBinding
  • DefaultReferenceValuesDomain
  • DefaultReferenceValuesDomainWithCFGAndDefUse
  • DefaultSetValuesDomain
  • DefaultSingletonValuesDomain
  • DefaultStringValuesBinding
  • IntegerRangeValues
  • IntegerSetValues
  • IntegerValues
  • LongSetValues
  • LongSetValuesShiftOperators
  • LongValues
  • LongValuesShiftOperators
  • MaxArrayLengthRefinement
  • NullPropertyRefinement
  • RecordAllThrownExceptions
  • ReferenceValues
  • ReflectiveInvoker
  • StringBuilderValues
  • StringValues
t

org.opalj.ai.domain.l1

ReferenceValues

trait ReferenceValues extends DefaultTypeLevelReferenceValues with Origin

Ordering
  1. Alphabetic
  2. By Inheritance
Inherited
  1. ReferenceValues
  2. Origin
  3. DefaultTypeLevelReferenceValues
  4. TypeLevelReferenceValues
  5. AsJavaObject
  6. GeneralizedArrayHandling
  7. ReferenceValuesDomain
  8. ReferenceValuesFactory
  9. ExceptionsFactory
  10. DefaultSpecialDomainValuesBinding
  11. ValuesDomain
  12. AnyRef
  13. Any
  1. Hide All
  2. Show All
Visibility
  1. Public
  2. Protected

Type Members

  1. class IllegalValue extends Value with IsIllegalValue

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

    Represents a value that has no well defined state/type. Such values are either the result of a join of two incompatible values or if the variable was identified as being dead. IllegalValue's are only found in registers (in the locals).

    Attributes
    protected
    Definition Classes
    ValuesDomain
    See also

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

  2. trait RETValue extends Value with IsReturnAddressValue
    Definition Classes
    ValuesDomain
  3. trait ReferenceValue extends TypedValue[ReferenceType] with IsReferenceValue
    Definition Classes
    ValuesDomain
  4. class ReturnAddressValue extends RETValue

    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 UnsupportedOperationException as these additional methods will never be called by the OPAL-AI.

  5. class ReturnAddressValues extends RETValue

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

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

    Definition Classes
    ValuesDomain
  6. trait TypedValue[+T <: Type] extends Value with KnownTypedValue
    Definition Classes
    ValuesDomain
  7. trait Value extends ValueInformation

    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 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.

  8. class ANullValue extends (DefaultTypeLevelReferenceValues.this)#NullValueLike
    Attributes
    protected[this]
    Definition Classes
    DefaultTypeLevelReferenceValues
  9. trait AnArrayValue extends (DefaultTypeLevelReferenceValues.this)#ArrayValueLike with IsSArrayValue with (DefaultTypeLevelReferenceValues.this)#SReferenceValue[ArrayType]
    Attributes
    protected[this]
    Definition Classes
    DefaultTypeLevelReferenceValues
  10. trait AnObjectValue extends (DefaultTypeLevelReferenceValues.this)#ObjectValueLike
    Attributes
    protected
    Definition Classes
    DefaultTypeLevelReferenceValues
  11. trait MObjectValueLike extends (DefaultTypeLevelReferenceValues.this)#AnObjectValue with IsMObjectValue
    Attributes
    protected
    Definition Classes
    DefaultTypeLevelReferenceValues
  12. trait SObjectValueLike extends (DefaultTypeLevelReferenceValues.this)#AnObjectValue with (DefaultTypeLevelReferenceValues.this)#SReferenceValue[ObjectType] with IsSObjectValue
    Attributes
    protected
    Definition Classes
    DefaultTypeLevelReferenceValues
  13. trait ArrayAbstraction extends AnyRef
    Definition Classes
    TypeLevelReferenceValues
  14. trait ArrayValueLike extends (TypeLevelReferenceValues.this)#ReferenceValueLike with IsSArrayValue

    Represents an array value.

    Represents an array value.

    Attributes
    protected[this]
    Definition Classes
    TypeLevelReferenceValues
  15. trait NullValueLike extends (TypeLevelReferenceValues.this)#ReferenceValueLike with IsNullValue

    Represents the runtime value null.

    Represents the runtime value null. Null values are basically found in the following two cases:

    1. The value null was pushed onto the stack using aconst_null.
    2. A reference value that is not guaranteed to be non-null is tested against null using ifnull or ifnonnull and we are now on the branch where the value has to be null.

    Depending on the precision of the domain null values may also be returned by method calls or field reads.

    Attributes
    protected
    Definition Classes
    TypeLevelReferenceValues
  16. trait ObjectValueLike extends (TypeLevelReferenceValues.this)#ReferenceValueLike

    Represents a class/interface value which may have a single class and/or multiple interfaces as its upper type bound.

    Represents a class/interface value which may have a single class and/or multiple interfaces as its upper type bound.

    Attributes
    protected[this]
    Definition Classes
    TypeLevelReferenceValues
  17. trait ReferenceValueLike extends (TypeLevelReferenceValues.this)#ReferenceValue with (TypeLevelReferenceValues.this)#ArrayAbstraction

    Abstracts over all values with computational type reference.

    Abstracts over all values with computational type reference. I.e., abstracts over class and array values and also the null value.

    Definition Classes
    TypeLevelReferenceValues
  18. trait SReferenceValue[T <: ReferenceType] extends (TypeLevelReferenceValues.this)#ReferenceValueLike with IsSReferenceValue[T]

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

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

    Attributes
    protected[this]
    Definition Classes
    TypeLevelReferenceValues
  19. abstract type AReferenceValue <: (ReferenceValues.this)#TheReferenceValue with (ReferenceValues.this)#DomainReferenceValue
  20. type ArrayLoadResult = Computation[(ReferenceValues.this)#DomainValue, (ReferenceValues.this)#ExceptionValues]

    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
  21. type ArrayStoreResult = Computation[Nothing, (ReferenceValues.this)#ExceptionValues]

    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
  22. trait ArrayValue extends (ReferenceValues.this)#AnArrayValue with (ReferenceValues.this)#NonNullSingleOriginSReferenceValue[ArrayType]
    Attributes
    protected
  23. abstract type DomainArrayValue <: (ReferenceValues.this)#ArrayValue with (ReferenceValues.this)#DomainSingleOriginReferenceValue
  24. final type DomainIllegalValue = (ReferenceValues.this)#IllegalValue

    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
    DefaultSpecialDomainValuesBindingValuesDomain
  25. abstract type DomainMultipleReferenceValues <: (ReferenceValues.this)#MultipleReferenceValues with (ReferenceValues.this)#AReferenceValue
  26. abstract type DomainNullValue <: (ReferenceValues.this)#NullValue with (ReferenceValues.this)#DomainSingleOriginReferenceValue
  27. abstract type DomainObjectValue <: (ReferenceValues.this)#ObjectValue with (ReferenceValues.this)#DomainSingleOriginReferenceValue
  28. abstract type DomainReferenceValue >: Null <: (ReferenceValues.this)#ReferenceValue with (ReferenceValues.this)#DomainTypedValue[ReferenceType]
    Definition Classes
    ValuesDomain
  29. final type DomainReturnAddressValue = (ReferenceValues.this)#ReturnAddressValue

    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
    DefaultSpecialDomainValuesBindingValuesDomain
  30. final type DomainReturnAddressValues = (ReferenceValues.this)#ReturnAddressValues
  31. abstract type DomainSingleOriginReferenceValue <: (ReferenceValues.this)#SingleOriginReferenceValue with (ReferenceValues.this)#AReferenceValue
  32. final type DomainTypedValue[+T <: Type] = (ReferenceValues.this)#TypedValue[T]
  33. final type DomainValue = (ReferenceValues.this)#Value

    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
    DefaultSpecialDomainValuesBindingValuesDomain
  34. type ExceptionValue = (ReferenceValues.this)#DomainReferenceValue

    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
  35. type ExceptionValues = Iterable[(ReferenceValues.this)#ExceptionValue]

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

    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
  37. type LocalsArray = Array[(ReferenceValues.this)#Locals]
    Definition Classes
    ValuesDomain
  38. trait MObjectValue extends (ReferenceValues.this)#MObjectValueLike with (ReferenceValues.this)#ObjectValue
    Attributes
    protected
  39. class MultipleReferenceValues extends IsMultipleReferenceValue with (ReferenceValues.this)#TheReferenceValue with MultipleOriginsValue

    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
  40. trait NonNullSingleOriginReferenceValue extends (ReferenceValues.this)#SingleOriginReferenceValue
  41. trait NonNullSingleOriginSReferenceValue[T <: ReferenceType] extends (ReferenceValues.this)#NonNullSingleOriginReferenceValue
  42. class NullValue extends (ReferenceValues.this)#ANullValue with (ReferenceValues.this)#SingleOriginReferenceValue
    Attributes
    protected
  43. trait ObjectValue extends (ReferenceValues.this)#AnObjectValue with (ReferenceValues.this)#NonNullSingleOriginReferenceValue
  44. type Operands = List[(ReferenceValues.this)#DomainValue]

    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
  45. type OperandsArray = Array[(ReferenceValues.this)#Operands]
    Definition Classes
    ValuesDomain
  46. type RefId = Int

    Two domain values that have the same refid are guaranteed to refer to the same object at runtime (must-alias).

    Two domain values that have the same refid are guaranteed to refer to the same object at runtime (must-alias).

    The refid enables us to distinguish two values created/returned by the same instruction but at a different point in time (recall, both values have the same origin). Such values may or may not be different; i.e., those values may or may not refer to the same object on the heap/stack.

    RefIds 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!

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

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

  48. trait SObjectValue extends (ReferenceValues.this)#SObjectValueLike with (ReferenceValues.this)#NonNullSingleOriginSReferenceValue[ObjectType] with (ReferenceValues.this)#ObjectValue
    Attributes
    protected
  49. trait SingleOriginReferenceValue extends (ReferenceValues.this)#TheReferenceValue with SingleOriginValue with UID

    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.

  50. trait TheReferenceValue extends (ReferenceValues.this)#ReferenceValueLike

    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.

Abstract Value Members

  1. abstract val AReferenceValueTag: ClassTag[(ReferenceValues.this)#AReferenceValue]
  2. abstract def ArithmeticException(origin: ValueOrigin): (ReferenceValues.this)#ExceptionValue

    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 ValueOriginForImmediateVMException to translate that pc to the appropriate ValueOrigin.

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

    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 ValueOriginForImmediateVMException to translate that pc to the appropriate ValueOrigin.

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

    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 ValueOriginForImmediateVMException to translate that pc to the appropriate ValueOrigin.

    Definition Classes
    ExceptionsFactory
  5. abstract def ArrayValue(pc: Int, isNull: Answer, isPrecise: Boolean, theUpperTypeBound: ArrayType, refId: Int): (ReferenceValues.this)#DomainArrayValue
    Attributes
    protected[domain]
  6. abstract def ClassCastException(origin: ValueOrigin): (ReferenceValues.this)#ExceptionValue

    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 ValueOriginForImmediateVMException to translate that pc to the appropriate ValueOrigin.

    Definition Classes
    ExceptionsFactory
  7. abstract def ClassNotFoundException(origin: ValueOrigin): (ReferenceValues.this)#ExceptionValue
    Definition Classes
    ExceptionsFactory
  8. abstract val DomainArrayValueTag: ClassTag[(ReferenceValues.this)#DomainArrayValue]
  9. abstract val DomainMultipleReferenceValuesTag: ClassTag[(ReferenceValues.this)#DomainMultipleReferenceValues]
  10. abstract val DomainNullValueTag: ClassTag[(ReferenceValues.this)#DomainNullValue]
  11. abstract val DomainObjectValueTag: ClassTag[(ReferenceValues.this)#DomainObjectValue]
  12. abstract val DomainReferenceValueTag: ClassTag[(ReferenceValues.this)#DomainReferenceValue]

    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 DomainSingleOriginReferenceValueTag: ClassTag[(ReferenceValues.this)#DomainSingleOriginReferenceValue]
  14. abstract def IllegalMonitorStateException(origin: ValueOrigin): (ReferenceValues.this)#ExceptionValue

    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 ValueOriginForImmediateVMException to translate that pc to the appropriate ValueOrigin.

    Definition Classes
    ExceptionsFactory
  15. abstract def MultipleReferenceValues(values: UIDSet[(ReferenceValues.this)#DomainSingleOriginReferenceValue], origins: ValueOrigins, isNull: Answer, isPrecise: Boolean, upperTypeBound: UIDSet[_ <: ReferenceType], refId: Int): (ReferenceValues.this)#DomainMultipleReferenceValues
    Attributes
    protected[domain]
  16. abstract def MultipleReferenceValues(values: UIDSet[(ReferenceValues.this)#DomainSingleOriginReferenceValue]): (ReferenceValues.this)#DomainMultipleReferenceValues
    Attributes
    protected[domain]
  17. abstract def NegativeArraySizeException(origin: ValueOrigin): (ReferenceValues.this)#ExceptionValue

    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 ValueOriginForImmediateVMException to translate that pc to the appropriate ValueOrigin.

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

    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 ValueOriginForImmediateVMException to translate that pc to the appropriate ValueOrigin.

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

    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: Int, isNull: Answer, upperTypeBound: UIDSet[ObjectType], refId: Int): (ReferenceValues.this)#DomainObjectValue
    Attributes
    protected[domain]
  21. abstract def ObjectValue(pc: Int, isNull: Answer, isPrecise: Boolean, theUpperTypeBound: ObjectType, refId: Int): (ReferenceValues.this)#DomainObjectValue
    Attributes
    protected[domain]
  22. abstract def Throwable(origin: ValueOrigin): (ReferenceValues.this)#ExceptionValue

    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 ValueOriginForImmediateVMException to translate that pc to the appropriate ValueOrigin.

    Definition Classes
    ExceptionsFactory
  23. implicit abstract def classHierarchy: ClassHierarchy

    This project's class hierarchy.

    This project's class hierarchy.

    Usually, just a redirect to the Project's class hierarchy or the default class hierarchy.

    Definition Classes
    ValuesDomain

Concrete Value Members

  1. implicit object SingleOriginValueOrdering extends Ordering[SingleOriginValue]
    Definition Classes
    Origin
  2. object AnArrayValue

    Enables matching of DomainValues that are array values.

    Enables matching of DomainValues that are array values.

    Definition Classes
    DefaultTypeLevelReferenceValues
  3. object MObjectValueLike
  4. object SObjectValueLike
  5. object IsNull
    Definition Classes
    TypeLevelReferenceValues
  6. object IsPrecise
    Definition Classes
    TypeLevelReferenceValues
  7. object UpperTypeBound
    Definition Classes
    TypeLevelReferenceValues
  8. final def !=(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  9. final def ##: Int
    Definition Classes
    AnyRef → Any
  10. final def ==(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  11. def ArrayValue(pc: Int, arrayType: ArrayType): (ReferenceValues.this)#DomainArrayValue

    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
    Definition Classes
    ReferenceValuesTypeLevelReferenceValues
    Note

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

  12. def ClassValue(pc: Int, t: Type): (ReferenceValues.this)#DomainObjectValue

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

    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
    DefaultSpecialDomainValuesBindingValuesDomain
  14. def InitializedDomainValue(origin: ValueOrigin, vi: ValueInformation): (ReferenceValues.this)#DomainValue

    Creates a domain value from the given value information that represents a properly domain value.

    Creates a domain value from the given value information that represents a properly domain value. A representation of a proper value is created even if the value information is provided for an uninitialized value.

    Definition Classes
    ReferenceValuesTypeLevelReferenceValuesValuesDomain
    Note

    This function is only defined for proper values, i.e., it is not defined for void values or illegal values.

    ,

    This method is intended to be overwritten by concrete domains which can represent more information.

  15. def InitializedObjectValue(pc: Int, objectType: ObjectType): (ReferenceValues.this)#DomainObjectValue

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

    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
    DefaultSpecialDomainValuesBindingValuesDomain
  17. final def MethodExternalNullPointerException(pc: Int): (ReferenceValues.this)#ExceptionValue
    Definition Classes
    ExceptionsFactory
  18. def MethodHandle(origin: ValueOrigin, handle: MethodHandle): (ReferenceValues.this)#DomainReferenceValue

    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
  19. def MethodType(origin: ValueOrigin, descriptor: MethodDescriptor): (ReferenceValues.this)#DomainReferenceValue

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

    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: Symbol("Empty")' (i.e., default values w.r.t. to the array's component type)
    Definition Classes
    ReferenceValuesTypeLevelReferenceValues
  21. def NewArray(pc: Int, count: (ReferenceValues.this)#DomainValue, arrayType: ArrayType): (ReferenceValues.this)#DomainArrayValue

    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: Symbol("Empty")' (i.e., default values w.r.t. to the array's component type)
    Definition Classes
    ReferenceValuesTypeLevelReferenceValues
  22. def NewObject(pc: Int, objectType: ObjectType): (ReferenceValues.this)#DomainObjectValue

    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 (super) 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).

  23. def NonNullObjectValue(pc: Int, objectType: ObjectType): (ReferenceValues.this)#DomainObjectValue

    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
  24. def ObjectValue(origin: ValueOrigin, isNull: Answer, isPrecise: Boolean, theUpperTypeBound: ObjectType): (ReferenceValues.this)#DomainObjectValue
    Attributes
    protected[domain]
  25. def ObjectValue(origin: ValueOrigin, isNull: Answer, upperTypeBound: UIDSet[ObjectType]): (ReferenceValues.this)#DomainObjectValue
    Attributes
    protected[domain]
  26. def ObjectValue(pc: Int, upperTypeBound: UIDSet[ObjectType]): (ReferenceValues.this)#DomainObjectValue

    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: Yes (An Object with multiple bounds can only exist due to a merge, in this case, the objects must have been initialized beforehand or the value is not used at all and actually represents a dead variable.)
    • Type: Upper Bound
    • Null: Unknown
    • Content: Unknown
    Definition Classes
    ReferenceValuesTypeLevelReferenceValues
  27. def ObjectValue(pc: Int, objectType: ObjectType): (ReferenceValues.this)#DomainObjectValue

    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 (I.e., it is not guaranteed that the constructor was called; unless NewObject was overridden and returns DomainValues that are distinguishable!)
    • Type: Upper Bound
    • Null: Unknown
    • Content: Unknown
    Definition Classes
    ReferenceValuesTypeLevelReferenceValues
  28. final def RefIdUpdate[T](value: T): MetaInformationUpdate[T]

    Creates an update object that characterizes a reference id update.

    Creates an update object that characterizes a reference id update.

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

    Annotations
    @inline()
  29. final def ReferenceValue(origin: ValueOrigin, isNull: Answer, isPrecise: Boolean, upperTypeBound: UIDSet[_ <: ReferenceType], refId: (ReferenceValues.this)#RefId): (ReferenceValues.this)#DomainSingleOriginReferenceValue
    Attributes
    protected[domain]
  30. final def ReferenceValue(origin: ValueOrigin, isNull: Answer, isPrecise: Boolean, theUpperTypeBound: ReferenceType): (ReferenceValues.this)#DomainSingleOriginReferenceValue
    Attributes
    protected[domain]
  31. def ReferenceValue(origin: ValueOrigin, isNull: Answer, isPrecise: Boolean, theUpperTypeBound: ReferenceType, refId: (ReferenceValues.this)#RefId): (ReferenceValues.this)#DomainSingleOriginReferenceValue
    Attributes
    protected[domain]
  32. final def ReferenceValue(pc: Int, upperTypeBound: ReferenceType): (ReferenceValues.this)#AReferenceValue

    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
  33. final def ReturnAddressValue(address: Int): (ReferenceValues.this)#ReturnAddressValue

    Factory method to create an instance of a ReturnAddressValue.

    Factory method to create an instance of a ReturnAddressValue.

    Definition Classes
    DefaultSpecialDomainValuesBindingValuesDomain
  34. def StringValue(pc: Int, value: String): (ReferenceValues.this)#DomainObjectValue

    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
  35. final def StructuralUpdateIllegalValue: StructuralUpdate[Nothing]

    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.

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

    The singleton instance of the IllegalValue.

    The singleton instance of the IllegalValue.

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

    The singleton instance of ReturnAddressValues

    The singleton instance of ReturnAddressValues

    Definition Classes
    DefaultSpecialDomainValuesBindingValuesDomain
  38. def UninitializedThis(objectType: ObjectType): (ReferenceValues.this)#DomainObjectValue

    Creates a new DomainValue that represents the this value of a constructor before the super constructor is called.

    Creates a new DomainValue that represents the this value of a constructor before the super constructor is called. Hence, the value origin is necessarily always -1.

    OPAL calls this method when it creates the initial locals for constructors.

    Summary

    The properties of the domain value are:

    • Initialized: no (only the memory is allocated for the object)
    • Type: upper bound
    • Null: no (This value is not null.)
    Definition Classes
    ReferenceValuesTypeLevelReferenceValuesReferenceValuesFactory
    Note

    Instances of arrays are never uninitialized.

  39. final def VMArithmeticException(pc: Int): (ReferenceValues.this)#ExceptionValue
    Definition Classes
    ExceptionsFactory
  40. final def VMArrayIndexOutOfBoundsException(pc: Int): (ReferenceValues.this)#ExceptionValue
    Definition Classes
    ExceptionsFactory
  41. final def VMArrayStoreException(pc: Int): (ReferenceValues.this)#ExceptionValue
    Definition Classes
    ExceptionsFactory
  42. final def VMClassCastException(pc: Int): (ReferenceValues.this)#ExceptionValue
    Definition Classes
    ExceptionsFactory
  43. final def VMClassNotFoundException(pc: Int): (ReferenceValues.this)#ExceptionValue
    Definition Classes
    ExceptionsFactory
  44. final def VMIllegalMonitorStateException(pc: Int): (ReferenceValues.this)#ExceptionValue
    Definition Classes
    ExceptionsFactory
  45. final def VMNegativeArraySizeException(pc: Int): (ReferenceValues.this)#ExceptionValue
    Definition Classes
    ExceptionsFactory
  46. final def VMNullPointerException(pc: Int): (ReferenceValues.this)#ExceptionValue
    Definition Classes
    ExceptionsFactory
  47. final def VMThrowable(pc: Int): (ReferenceValues.this)#ExceptionValue
    Definition Classes
    ExceptionsFactory
  48. def aaload(pc: Int, index: (ReferenceValues.this)#DomainValue, arrayref: (ReferenceValues.this)#DomainValue): (ReferenceValues.this)#ArrayLoadResult
  49. def aastore(pc: Int, value: (ReferenceValues.this)#DomainValue, index: (ReferenceValues.this)#DomainValue, arrayref: (ReferenceValues.this)#DomainValue): (ReferenceValues.this)#ArrayStoreResult
  50. def arraylength(pc: Int, arrayref: (ReferenceValues.this)#DomainValue): Computation[(ReferenceValues.this)#DomainValue, (ReferenceValues.this)#ExceptionValue]

    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.

  51. def arrayload(pc: Int, index: (ReferenceValues.this)#DomainValue, arrayref: (ReferenceValues.this)#DomainValue): (ReferenceValues.this)#ArrayLoadResult

    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.

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

    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.

  53. def asArrayAbstraction(value: (ReferenceValues.this)#DomainValue): (ReferenceValues.this)#ArrayAbstraction
    Definition Classes
    TypeLevelReferenceValues
  54. final def asInstanceOf[T0]: T0
    Definition Classes
    Any
  55. def asObjectValue(value: (ReferenceValues.this)#DomainValue): (ReferenceValues.this)#DomainObjectValue
    Definition Classes
    TypeLevelReferenceValues
  56. def asReferenceValue(value: (ReferenceValues.this)#DomainValue): (ReferenceValues.this)#AReferenceValue

    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
  57. def baload(pc: Int, index: (ReferenceValues.this)#DomainValue, arrayref: (ReferenceValues.this)#DomainValue): (ReferenceValues.this)#ArrayLoadResult
  58. def bastore(pc: Int, value: (ReferenceValues.this)#DomainValue, index: (ReferenceValues.this)#DomainValue, arrayref: (ReferenceValues.this)#DomainValue): (ReferenceValues.this)#ArrayStoreResult
  59. def caload(pc: Int, index: (ReferenceValues.this)#DomainValue, arrayref: (ReferenceValues.this)#DomainValue): (ReferenceValues.this)#ArrayLoadResult
  60. def castore(pc: Int, value: (ReferenceValues.this)#DomainValue, index: (ReferenceValues.this)#DomainValue, arrayref: (ReferenceValues.this)#DomainValue): (ReferenceValues.this)#ArrayStoreResult
  61. def clone(): AnyRef
    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.CloneNotSupportedException]) @native() @IntrinsicCandidate()
  62. def daload(pc: Int, index: (ReferenceValues.this)#DomainValue, arrayref: (ReferenceValues.this)#DomainValue): (ReferenceValues.this)#ArrayLoadResult
  63. def dastore(pc: Int, value: (ReferenceValues.this)#DomainValue, index: (ReferenceValues.this)#DomainValue, arrayref: (ReferenceValues.this)#DomainValue): (ReferenceValues.this)#ArrayStoreResult
  64. def effectiveUTB(utb: UIDSet[_ <: ReferenceType]): UIDSet[_ <: ReferenceType]

    Computes the effective upper-type bound which is the (single) final type in the utb if it contains one.

    Computes the effective upper-type bound which is the (single) final type in the utb if it contains one. In this case the other types have to be in a super-/subtype relation and were added "just" as a result of explicit CHECKCAST instructions.

    Attributes
    protected
    Note

    This method is generally only useful when we have to handle incomplete type hierarchies.

  65. final def eq(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  66. def equals(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef → Any
  67. def faload(pc: Int, index: (ReferenceValues.this)#DomainValue, arrayref: (ReferenceValues.this)#DomainValue): (ReferenceValues.this)#ArrayLoadResult
  68. def fastore(pc: Int, value: (ReferenceValues.this)#DomainValue, index: (ReferenceValues.this)#DomainValue, arrayref: (ReferenceValues.this)#DomainValue): (ReferenceValues.this)#ArrayStoreResult
  69. def foreachOrigin(value: (ReferenceValues.this)#DomainValue, f: (ValueOrigin) => Unit): Unit

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

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

    Definition Classes
    Origin
  70. final def getClass(): Class[_ <: AnyRef]
    Definition Classes
    AnyRef → Any
    Annotations
    @native() @IntrinsicCandidate()
  71. def hashCode(): Int
    Definition Classes
    AnyRef → Any
    Annotations
    @native() @IntrinsicCandidate()
  72. def iaload(pc: Int, index: (ReferenceValues.this)#DomainValue, arrayref: (ReferenceValues.this)#DomainValue): (ReferenceValues.this)#ArrayLoadResult
  73. def iastore(pc: Int, value: (ReferenceValues.this)#DomainValue, index: (ReferenceValues.this)#DomainValue, arrayref: (ReferenceValues.this)#DomainValue): (ReferenceValues.this)#ArrayStoreResult
  74. final def isASubtypeOf(subtype: ReferenceType, supertype: ReferenceType): Answer

    Tests if subtype is known to be subtype of supertype.

    Tests if subtype is known to be subtype of supertype. See org.opalj.br.ClassHierarchy's isSubtypeOf method for details.

    Definition Classes
    ValuesDomain
  75. final def isInstanceOf[T0]: Boolean
    Definition Classes
    Any
  76. def isNull(values: Iterable[(ReferenceValues.this)#AReferenceValue]): Answer

    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

    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; i.e., if all values represent Null true will be returned.

    Attributes
    protected
  78. final def isSubtypeOf(subtype: ReferenceType, supertype: ReferenceType): Boolean

    Tests if subtype is known to be subtype of supertype.

    Tests if subtype is known to be subtype of supertype. See org.opalj.br.ClassHierarchy's isSubtypeOf method for details.

    Definition Classes
    ValuesDomain
  79. final def isValueASubtypeOf(value: (ReferenceValues.this)#DomainValue, supertype: ReferenceType): Answer

    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.

  80. final def justThrows(value: (ReferenceValues.this)#ExceptionValue): ThrowsException[(ReferenceValues.this)#ExceptionValues]
    Definition Classes
    ReferenceValuesFactory
  81. def laload(pc: Int, index: (ReferenceValues.this)#DomainValue, arrayref: (ReferenceValues.this)#DomainValue): (ReferenceValues.this)#ArrayLoadResult
  82. def lastore(pc: Int, value: (ReferenceValues.this)#DomainValue, index: (ReferenceValues.this)#DomainValue, arrayref: (ReferenceValues.this)#DomainValue): (ReferenceValues.this)#ArrayStoreResult
  83. def mergeDEComputations(pc: Int, c1: Computation[(ReferenceValues.this)#DomainValue, (ReferenceValues.this)#ExceptionValue], c2: Computation[(ReferenceValues.this)#DomainValue, (ReferenceValues.this)#ExceptionValue]): Computation[(ReferenceValues.this)#DomainValue, (ReferenceValues.this)#ExceptionValue]

    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
  84. def mergeDEsComputations(pc: Int, c1: Computation[(ReferenceValues.this)#DomainValue, (ReferenceValues.this)#ExceptionValues], c2: Computation[(ReferenceValues.this)#DomainValue, (ReferenceValues.this)#ExceptionValues]): Computation[(ReferenceValues.this)#DomainValue, (ReferenceValues.this)#ExceptionValues]

    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
  85. def mergeDomainValues(pc: Int, v1: (ReferenceValues.this)#DomainValue, v2: (ReferenceValues.this)#DomainValue): (ReferenceValues.this)#DomainValue

    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
  86. def mergeEsComputations(pc: Int, c1: Computation[Nothing, (ReferenceValues.this)#ExceptionValues], c2: Computation[Nothing, (ReferenceValues.this)#ExceptionValues]): Computation[Nothing, (ReferenceValues.this)#ExceptionValues]

    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
  87. def mergeMultipleExceptionValues(pc: Int, v1s: (ReferenceValues.this)#ExceptionValues, v2s: (ReferenceValues.this)#ExceptionValues): (ReferenceValues.this)#ExceptionValues

    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
  88. def multianewarray(pc: Int, counts: (ReferenceValues.this)#Operands, arrayType: ArrayType): Computation[(ReferenceValues.this)#DomainArrayValue, (ReferenceValues.this)#ExceptionValue]

    Creates a multi-dimensional array.

    Creates a multi-dimensional array.

    Definition Classes
    TypeLevelReferenceValuesReferenceValuesDomain
    Note

    The componentType may be (again) an array type.

    ,

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

  89. final def ne(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  90. def newarray(pc: Int, count: (ReferenceValues.this)#DomainValue, componentType: FieldType): Computation[(ReferenceValues.this)#DomainValue, (ReferenceValues.this)#ExceptionValue]

    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.

  91. def nextRefId(): (ReferenceValues.this)#RefId

    Returns the next unused time stamp.

  92. final def notify(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native() @IntrinsicCandidate()
  93. final def notifyAll(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native() @IntrinsicCandidate()
  94. final def nullRefId: (ReferenceValues.this)#RefId
  95. def origins(value: (ReferenceValues.this)#DomainValue): ValueOrigins

    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.

    Definition Classes
    Origin
  96. def originsIterator(value: (ReferenceValues.this)#DomainValue): ValueOriginsIterator

    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
  97. def properties(pc: PC, propertyToString: (AnyRef) => String = p => p.toString): Option[String]

    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
  98. def providesOriginInformationFor(ct: ComputationalType): Boolean

    Implementers are expected to "override" this method and to call super.providesOriginInformationFor to make it possible to stack several domain implementations which provide origin information.

    Implementers are expected to "override" this method and to call super.providesOriginInformationFor to make it possible to stack several domain implementations which provide origin information.

    Definition Classes
    ReferenceValuesOrigin
  99. def refAreEqual(pc: Int, v1: (ReferenceValues.this)#DomainValue, v2: (ReferenceValues.this)#DomainValue): Answer

    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
  100. def refAreNotEqual(pc: Int, value1: (ReferenceValues.this)#DomainValue, value2: (ReferenceValues.this)#DomainValue): Answer

    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
  101. def refEstablishAreEqual(pc: Int, value1: (ReferenceValues.this)#DomainValue, value2: (ReferenceValues.this)#DomainValue, operands: (ReferenceValues.this)#Operands, locals: (ReferenceValues.this)#Locals): ((ReferenceValues.this)#Operands, (ReferenceValues.this)#Locals)

    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
  102. def refEstablishAreNotEqual(pc: Int, value1: (ReferenceValues.this)#DomainValue, value2: (ReferenceValues.this)#DomainValue, operands: (ReferenceValues.this)#Operands, locals: (ReferenceValues.this)#Locals): ((ReferenceValues.this)#Operands, (ReferenceValues.this)#Locals)

    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
  103. def refEstablishIsNonNull(pc: Int, value: (ReferenceValues.this)#DomainValue, operands: (ReferenceValues.this)#Operands, locals: (ReferenceValues.this)#Locals): ((ReferenceValues.this)#Operands, (ReferenceValues.this)#Locals)

    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
  104. def refEstablishIsNull(pc: Int, value: (ReferenceValues.this)#DomainValue, operands: (ReferenceValues.this)#Operands, locals: (ReferenceValues.this)#Locals): ((ReferenceValues.this)#Operands, (ReferenceValues.this)#Locals)

    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
  105. def refIsNonNull(pc: Int, value: (ReferenceValues.this)#DomainValue): Answer

    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
  106. final def refIsNull(pc: Int, value: (ReferenceValues.this)#DomainValue): Answer

    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
  107. def refSetUpperTypeBoundOfTopOperand(pc: Int, bound: ReferenceType, operands: (ReferenceValues.this)#Operands, locals: (ReferenceValues.this)#Locals): ((ReferenceValues.this)#Operands, (ReferenceValues.this)#Locals)

    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
  108. def refTopOperandIsNull(pc: Int, operands: (ReferenceValues.this)#Operands, locals: (ReferenceValues.this)#Locals): ((ReferenceValues.this)#Operands, (ReferenceValues.this)#Locals)

    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 or if a InstanceOf check has succeeded.

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

    Definition Classes
    ReferenceValuesTypeLevelReferenceValuesReferenceValuesDomain
  109. def refineIsNull(pc: Int, value: (ReferenceValues.this)#DomainValue, isNull: Answer, operands: (ReferenceValues.this)#Operands, locals: (ReferenceValues.this)#Locals): ((ReferenceValues.this)#Operands, (ReferenceValues.this)#Locals)
    Attributes
    protected[this]
  110. def saload(pc: Int, index: (ReferenceValues.this)#DomainValue, arrayref: (ReferenceValues.this)#DomainValue): (ReferenceValues.this)#ArrayLoadResult
  111. def sastore(pc: Int, value: (ReferenceValues.this)#DomainValue, index: (ReferenceValues.this)#DomainValue, arrayref: (ReferenceValues.this)#DomainValue): (ReferenceValues.this)#ArrayStoreResult
  112. def summarize(pc: Int, values: Iterable[(ReferenceValues.this)#DomainValue]): (ReferenceValues.this)#DomainValue

    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.

  113. final def synchronized[T0](arg0: => T0): T0
    Definition Classes
    AnyRef
  114. final def throws(value: (ReferenceValues.this)#ExceptionValue): ThrowsException[(ReferenceValues.this)#ExceptionValue]
    Definition Classes
    ReferenceValuesFactory
  115. def toJavaObject(pc: Int, value: (ReferenceValues.this)#DomainValue): Option[AnyRef]

    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.

  116. def toString(): String
    Definition Classes
    AnyRef → Any
  117. def upperTypeBound(theValues: UIDSet[(ReferenceValues.this)#DomainSingleOriginReferenceValue]): UIDSet[_ <: ReferenceType]

    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 unless all values are representing Null.

  118. final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException])
  119. final def wait(arg0: Long): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException])
  120. final def wait(): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException])
  121. implicit object DomainSingleOriginReferenceValueOrdering extends Ordering[(ReferenceValues.this)#DomainSingleOriginReferenceValue]

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

  122. object MultipleReferenceValues

Deprecated Value Members

  1. def finalize(): Unit
    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.Throwable]) @Deprecated
    Deprecated

Inherited from Origin

Inherited from AsJavaObject

Inherited from ReferenceValuesDomain

Inherited from ReferenceValuesFactory

Inherited from ExceptionsFactory

Inherited from ValuesDomain

Inherited from AnyRef

Inherited from Any

Ungrouped