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 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.

    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. Furthermore, the concrete data-structure is always considered an implementation detail and may change at any time.

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

    org.opalj.ai.AI - Implements the abstract interpreter that processes a methods code and uses an analysis-specific domain to perform 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.
      • TheClassHierarchy defines a standard mechanism how to get the project's class hierarchy.
      • ...
    • Domains That Provide a Default Implementation
      • Origin defines the functionality to return a value's origin if the value supports that.
      • TheProject default implementation of the TheClassHierarchy trait that uses the project's class hierarchy.
      • DefaultHandlingOfMethodResults basically implements a Domain's methods related to return instructions an uncaught exceptions.
      • ...
    • Domains That Implement Stackable Functionality
      • 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 ValuesCoordinatingDomain for further details).

    Definition Classes
    ai
  • package l0
    Definition Classes
    domain
  • BaseDomain
  • BaseDomainWithDefUse
  • DefaultReferenceValuesBinding
  • DefaultTypeLevelDoubleValues
  • DefaultTypeLevelFloatValues
  • DefaultTypeLevelHandlingForReturnInstructions
  • DefaultTypeLevelHandlingForThrownExceptions
  • DefaultTypeLevelHandlingOfMethodResults
  • DefaultTypeLevelHandlingOfVoidReturns
  • DefaultTypeLevelIntegerValues
  • DefaultTypeLevelLongValues
  • DefaultTypeLevelReferenceValues
  • FieldTypesAnalysis
  • ParameterUsageAnalysis
  • PrimitiveTACAIDomain
  • ReturnInstructionsDomain
  • SimpleTypeLevelInvokeInstructions
  • TypeLevelDomain
  • TypeLevelDoubleValues
  • TypeLevelFieldAccessInstructions
  • TypeLevelFloatValues
  • TypeLevelIntegerValues
  • TypeLevelInvokeInstructions
  • TypeLevelLongValues
  • TypeLevelLongValuesShiftOperators
  • TypeLevelPrimitiveValuesConversions
  • TypeLevelReferenceValues
  • ZeroDomain
t

org.opalj.ai.domain.l0

DefaultTypeLevelReferenceValues

trait DefaultTypeLevelReferenceValues extends DefaultDomainValueBinding with TypeLevelReferenceValues

Default implementation for handling reference values.

Self Type
DefaultTypeLevelReferenceValues with IntegerValuesDomain with TypedValuesFactory with Configuration with TheClassHierarchy
Source
DefaultTypeLevelReferenceValues.scala
Ordering
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Inherited
  1. DefaultTypeLevelReferenceValues
  2. TypeLevelReferenceValues
  3. AsJavaObject
  4. GeneralizedArrayHandling
  5. ReferenceValuesDomain
  6. ReferenceValuesFactory
  7. ExceptionsFactory
  8. DefaultDomainValueBinding
  9. ValuesDomain
  10. AnyRef
  11. Any
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Visibility
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Type Members

  1. class IllegalValue extends Value

    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.

  2. trait RETValue extends Value
    Definition Classes
    ValuesDomain
  3. 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 OperationNotSupportedException as these additional methods will never be called by OPAL-AI.

  4. class ReturnAddressValues extends RETValue

    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
  5. trait TypedValue[+T <: Type] extends Value with KnownType
    Definition Classes
    ValuesDomain
  6. trait Value extends AnyRef

    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.

  7. abstract type AReferenceValue <: (DefaultTypeLevelReferenceValues.this)#DomainReferenceValue with (DefaultTypeLevelReferenceValues.this)#ReferenceValue
    Definition Classes
    TypeLevelReferenceValues
  8. type ArrayLoadResult = Computation[(DefaultTypeLevelReferenceValues.this)#DomainValue, (DefaultTypeLevelReferenceValues.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
  9. type ArrayStoreResult = Computation[Nothing, (DefaultTypeLevelReferenceValues.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
  10. class ArrayValue extends (DefaultTypeLevelReferenceValues.this)#ArrayValue with (DefaultTypeLevelReferenceValues.this)#SReferenceValue[ArrayType]

    Attributes
    protected[this]
  11. abstract type DomainArrayValue <: (DefaultTypeLevelReferenceValues.this)#ArrayValue with (DefaultTypeLevelReferenceValues.this)#AReferenceValue
  12. final type DomainIllegalValue = (DefaultTypeLevelReferenceValues.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
    DefaultDomainValueBindingValuesDomain
  13. abstract type DomainNullValue <: (DefaultTypeLevelReferenceValues.this)#NullValue with (DefaultTypeLevelReferenceValues.this)#AReferenceValue
  14. abstract type DomainObjectValue <: (DefaultTypeLevelReferenceValues.this)#ObjectValue with (DefaultTypeLevelReferenceValues.this)#AReferenceValue
  15. abstract type DomainReferenceValue >: Null <: (DefaultTypeLevelReferenceValues.this)#ReferenceValue with (DefaultTypeLevelReferenceValues.this)#DomainTypedValue[ReferenceType]
    Definition Classes
    ValuesDomain
  16. final type DomainReturnAddressValue = (DefaultTypeLevelReferenceValues.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
    DefaultDomainValueBindingValuesDomain
  17. final type DomainReturnAddressValues = (DefaultTypeLevelReferenceValues.this)#ReturnAddressValues
  18. final type DomainTypedValue[+T <: Type] = (DefaultTypeLevelReferenceValues.this)#TypedValue[T]
  19. final type DomainValue = (DefaultTypeLevelReferenceValues.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
    DefaultDomainValueBindingValuesDomain
  20. type ExceptionValue = (DefaultTypeLevelReferenceValues.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
  21. type ExceptionValues = Iterable[(DefaultTypeLevelReferenceValues.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
  22. type Locals = collection.mutable.Locals[(DefaultTypeLevelReferenceValues.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
  23. type LocalsArray = Array[(DefaultTypeLevelReferenceValues.this)#Locals]
    Definition Classes
    ValuesDomain
  24. class MObjectValue extends (DefaultTypeLevelReferenceValues.this)#ObjectValue

    Attributes
    protected
  25. class NullValue extends (DefaultTypeLevelReferenceValues.this)#NullValue
    Attributes
    protected[this]
  26. trait ObjectValue extends (DefaultTypeLevelReferenceValues.this)#ObjectValue
    Attributes
    protected
  27. type Operands = Chain[(DefaultTypeLevelReferenceValues.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
  28. type OperandsArray = Array[(DefaultTypeLevelReferenceValues.this)#Operands]
    Definition Classes
    ValuesDomain
  29. class SObjectValue extends (DefaultTypeLevelReferenceValues.this)#ObjectValue with (DefaultTypeLevelReferenceValues.this)#SReferenceValue[ObjectType]
    Attributes
    protected
  30. trait ArrayAbstraction extends AnyRef
    Definition Classes
    TypeLevelReferenceValues
  31. trait ReferenceValue 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
  32. trait SReferenceValue[T <: ReferenceType] extends (TypeLevelReferenceValues.this)#ReferenceValue

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

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

    Attributes
    protected[this]
    Definition Classes
    TypeLevelReferenceValues

Abstract Value Members

  1. abstract def ArithmeticException(origin: ValueOrigin): (DefaultTypeLevelReferenceValues.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 ValueOriginForVMLevelValue to translate that pc to the appropriate ValueOrigin.

    Definition Classes
    ExceptionsFactory
  2. abstract def ArrayIndexOutOfBoundsException(origin: ValueOrigin): (DefaultTypeLevelReferenceValues.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 ValueOriginForVMLevelValue to translate that pc to the appropriate ValueOrigin.

    Definition Classes
    ExceptionsFactory
  3. abstract def ArrayStoreException(origin: ValueOrigin): (DefaultTypeLevelReferenceValues.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 ValueOriginForVMLevelValue to translate that pc to the appropriate ValueOrigin.

    Definition Classes
    ExceptionsFactory
  4. abstract def ArrayValue(pc: PC, arrayType: ArrayType): (DefaultTypeLevelReferenceValues.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
    Attributes
    protected
    Definition Classes
    TypeLevelReferenceValues
    Note

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

  5. abstract def ClassCastException(origin: ValueOrigin): (DefaultTypeLevelReferenceValues.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 ValueOriginForVMLevelValue to translate that pc to the appropriate ValueOrigin.

    Definition Classes
    ExceptionsFactory
  6. abstract def ClassNotFoundException(origin: ValueOrigin): (DefaultTypeLevelReferenceValues.this)#ExceptionValue
    Definition Classes
    ExceptionsFactory
  7. abstract val DomainReferenceValue: ClassTag[(DefaultTypeLevelReferenceValues.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
  8. abstract def IllegalMonitorStateException(origin: ValueOrigin): (DefaultTypeLevelReferenceValues.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 ValueOriginForVMLevelValue to translate that pc to the appropriate ValueOrigin.

    Definition Classes
    ExceptionsFactory
  9. abstract def NegativeArraySizeException(origin: ValueOrigin): (DefaultTypeLevelReferenceValues.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 ValueOriginForVMLevelValue to translate that pc to the appropriate ValueOrigin.

    Definition Classes
    ExceptionsFactory
  10. abstract def NullPointerException(origin: ValueOrigin): (DefaultTypeLevelReferenceValues.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 ValueOriginForVMLevelValue to translate that pc to the appropriate ValueOrigin.

    Definition Classes
    ExceptionsFactory
  11. abstract def NullValue(pc: PC): (DefaultTypeLevelReferenceValues.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
  12. abstract def ObjectValue(pc: PC, upperTypeBound: UIDSet[ObjectType]): (DefaultTypeLevelReferenceValues.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: Unknown (i.e., it is not guaranteed that the constructor was called.)
    • Type: Upper Bound
    • Null: Unknown
    • Content: Unknown
    Definition Classes
    TypeLevelReferenceValues
  13. abstract def ObjectValue(pc: PC, objectType: ObjectType): (DefaultTypeLevelReferenceValues.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
    • Type: Upper Bound
    • Null: Unknown
    • Content: Unknown
    Definition Classes
    TypeLevelReferenceValues
  14. abstract def Throwable(origin: ValueOrigin): (DefaultTypeLevelReferenceValues.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 ValueOriginForVMLevelValue to translate that pc to the appropriate ValueOrigin.

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

    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
    Definition Classes
    AnyRef → Any
  2. final def ##(): Int
    Definition Classes
    AnyRef → Any
  3. final def ==(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  4. def ClassValue(pc: PC, t: Type): (DefaultTypeLevelReferenceValues.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
    TypeLevelReferenceValuesReferenceValuesFactory
  5. final val DomainValue: ClassTag[(DefaultTypeLevelReferenceValues.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
    DefaultDomainValueBindingValuesDomain
  6. def InitializedArrayValue(pc: PC, arrayType: ArrayType, counts: Chain[Int]): (DefaultTypeLevelReferenceValues.this)#DomainArrayValue

    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
    TypeLevelReferenceValuesReferenceValuesFactory
  7. def InitializedObjectValue(pc: PC, objectType: ObjectType): (DefaultTypeLevelReferenceValues.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 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
    TypeLevelReferenceValuesReferenceValuesFactory
  8. final val MetaInformationUpdateIllegalValue: MetaInformationUpdate[(DefaultTypeLevelReferenceValues.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
    DefaultDomainValueBindingValuesDomain
  9. def MethodHandle(origin: ValueOrigin, handle: MethodHandle): (DefaultTypeLevelReferenceValues.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
  10. def MethodType(origin: ValueOrigin, descriptor: MethodDescriptor): (DefaultTypeLevelReferenceValues.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
  11. def NewArray(pc: PC, counts: (DefaultTypeLevelReferenceValues.this)#Operands, arrayType: ArrayType): (DefaultTypeLevelReferenceValues.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: Empty (i.e., default values w.r.t. to the array's component type)
    Definition Classes
    TypeLevelReferenceValues
  12. def NewArray(pc: PC, count: (DefaultTypeLevelReferenceValues.this)#DomainValue, arrayType: ArrayType): (DefaultTypeLevelReferenceValues.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: Empty (i.e., default values w.r.t. to the array's component type)
    Definition Classes
    TypeLevelReferenceValues
  13. def NewObject(pc: PC, objectType: ObjectType): (DefaultTypeLevelReferenceValues.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 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
    TypeLevelReferenceValuesReferenceValuesFactory
    Note

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

  14. def NonNullObjectValue(pc: PC, objectType: ObjectType): (DefaultTypeLevelReferenceValues.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
    TypeLevelReferenceValuesReferenceValuesFactory
  15. def ReferenceValue(pc: PC, upperTypeBound: ReferenceType): (DefaultTypeLevelReferenceValues.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
  16. final def ReturnAddressValue(address: Int): (DefaultTypeLevelReferenceValues.this)#ReturnAddressValue

    Factory method to create an instance of a ReturnAddressValue.

    Factory method to create an instance of a ReturnAddressValue.

    Definition Classes
    DefaultDomainValueBindingValuesDomain
  17. def StringValue(pc: PC, value: String): (DefaultTypeLevelReferenceValues.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
    TypeLevelReferenceValuesReferenceValuesFactory
  18. 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.

  19. final val TheIllegalValue: (DefaultTypeLevelReferenceValues.this)#DomainIllegalValue

    The singleton instance of the IllegalValue.

    The singleton instance of the IllegalValue.

    Definition Classes
    DefaultDomainValueBindingValuesDomain
  20. final val TheReturnAddressValues: (DefaultTypeLevelReferenceValues.this)#ReturnAddressValues

    The singleton instance of ReturnAddressValues

    The singleton instance of ReturnAddressValues

    Definition Classes
    DefaultDomainValueBindingValuesDomain
  21. final def VMArithmeticException(pc: PC): (DefaultTypeLevelReferenceValues.this)#ExceptionValue
    Definition Classes
    ExceptionsFactory
  22. final def VMArrayIndexOutOfBoundsException(pc: PC): (DefaultTypeLevelReferenceValues.this)#ExceptionValue
    Definition Classes
    ExceptionsFactory
  23. final def VMArrayStoreException(pc: PC): (DefaultTypeLevelReferenceValues.this)#ExceptionValue
    Definition Classes
    ExceptionsFactory
  24. final def VMClassCastException(pc: PC): (DefaultTypeLevelReferenceValues.this)#ExceptionValue
    Definition Classes
    ExceptionsFactory
  25. final def VMClassNotFoundException(pc: PC): (DefaultTypeLevelReferenceValues.this)#ExceptionValue
    Definition Classes
    ExceptionsFactory
  26. final def VMIllegalMonitorStateException(pc: PC): (DefaultTypeLevelReferenceValues.this)#ExceptionValue
    Definition Classes
    ExceptionsFactory
  27. final def VMNegativeArraySizeException(pc: PC): (DefaultTypeLevelReferenceValues.this)#ExceptionValue
    Definition Classes
    ExceptionsFactory
  28. final def VMNullPointerException(pc: PC): (DefaultTypeLevelReferenceValues.this)#ExceptionValue
    Definition Classes
    ExceptionsFactory
  29. final def VMThrowable(pc: PC): (DefaultTypeLevelReferenceValues.this)#ExceptionValue
    Definition Classes
    ExceptionsFactory
  30. def aaload(pc: PC, index: (DefaultTypeLevelReferenceValues.this)#DomainValue, arrayref: (DefaultTypeLevelReferenceValues.this)#DomainValue): (DefaultTypeLevelReferenceValues.this)#ArrayLoadResult
  31. def aastore(pc: PC, value: (DefaultTypeLevelReferenceValues.this)#DomainValue, index: (DefaultTypeLevelReferenceValues.this)#DomainValue, arrayref: (DefaultTypeLevelReferenceValues.this)#DomainValue): (DefaultTypeLevelReferenceValues.this)#ArrayStoreResult
  32. def arraylength(pc: PC, arrayref: (DefaultTypeLevelReferenceValues.this)#DomainValue): Computation[(DefaultTypeLevelReferenceValues.this)#DomainValue, (DefaultTypeLevelReferenceValues.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.

  33. def arrayload(pc: PC, index: (DefaultTypeLevelReferenceValues.this)#DomainValue, arrayref: (DefaultTypeLevelReferenceValues.this)#DomainValue): (DefaultTypeLevelReferenceValues.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.

  34. def arraystore(pc: PC, value: (DefaultTypeLevelReferenceValues.this)#DomainValue, index: (DefaultTypeLevelReferenceValues.this)#DomainValue, arrayref: (DefaultTypeLevelReferenceValues.this)#DomainValue): (DefaultTypeLevelReferenceValues.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.

  35. def asArrayAbstraction(value: (DefaultTypeLevelReferenceValues.this)#DomainValue): (DefaultTypeLevelReferenceValues.this)#ArrayAbstraction
    Definition Classes
    TypeLevelReferenceValues
  36. final def asInstanceOf[T0]: T0
    Definition Classes
    Any
  37. def asObjectValue(value: (DefaultTypeLevelReferenceValues.this)#DomainValue): (DefaultTypeLevelReferenceValues.this)#DomainObjectValue
    Definition Classes
    TypeLevelReferenceValues
  38. def asReferenceValue(value: (DefaultTypeLevelReferenceValues.this)#DomainValue): (DefaultTypeLevelReferenceValues.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
  39. def baload(pc: PC, index: (DefaultTypeLevelReferenceValues.this)#DomainValue, arrayref: (DefaultTypeLevelReferenceValues.this)#DomainValue): (DefaultTypeLevelReferenceValues.this)#ArrayLoadResult
  40. def bastore(pc: PC, value: (DefaultTypeLevelReferenceValues.this)#DomainValue, index: (DefaultTypeLevelReferenceValues.this)#DomainValue, arrayref: (DefaultTypeLevelReferenceValues.this)#DomainValue): (DefaultTypeLevelReferenceValues.this)#ArrayStoreResult
  41. def caload(pc: PC, index: (DefaultTypeLevelReferenceValues.this)#DomainValue, arrayref: (DefaultTypeLevelReferenceValues.this)#DomainValue): (DefaultTypeLevelReferenceValues.this)#ArrayLoadResult
  42. def castore(pc: PC, value: (DefaultTypeLevelReferenceValues.this)#DomainValue, index: (DefaultTypeLevelReferenceValues.this)#DomainValue, arrayref: (DefaultTypeLevelReferenceValues.this)#DomainValue): (DefaultTypeLevelReferenceValues.this)#ArrayStoreResult
  43. def clone(): AnyRef
    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @native() @throws( ... )
  44. def daload(pc: PC, index: (DefaultTypeLevelReferenceValues.this)#DomainValue, arrayref: (DefaultTypeLevelReferenceValues.this)#DomainValue): (DefaultTypeLevelReferenceValues.this)#ArrayLoadResult
  45. def dastore(pc: PC, value: (DefaultTypeLevelReferenceValues.this)#DomainValue, index: (DefaultTypeLevelReferenceValues.this)#DomainValue, arrayref: (DefaultTypeLevelReferenceValues.this)#DomainValue): (DefaultTypeLevelReferenceValues.this)#ArrayStoreResult
  46. final def eq(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  47. def equals(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  48. def faload(pc: PC, index: (DefaultTypeLevelReferenceValues.this)#DomainValue, arrayref: (DefaultTypeLevelReferenceValues.this)#DomainValue): (DefaultTypeLevelReferenceValues.this)#ArrayLoadResult
  49. def fastore(pc: PC, value: (DefaultTypeLevelReferenceValues.this)#DomainValue, index: (DefaultTypeLevelReferenceValues.this)#DomainValue, arrayref: (DefaultTypeLevelReferenceValues.this)#DomainValue): (DefaultTypeLevelReferenceValues.this)#ArrayStoreResult
  50. def finalize(): Unit
    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( classOf[java.lang.Throwable] )
  51. final def getClass(): Class[_]
    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  52. def hashCode(): Int
    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  53. def iaload(pc: PC, index: (DefaultTypeLevelReferenceValues.this)#DomainValue, arrayref: (DefaultTypeLevelReferenceValues.this)#DomainValue): (DefaultTypeLevelReferenceValues.this)#ArrayLoadResult
  54. def iastore(pc: PC, value: (DefaultTypeLevelReferenceValues.this)#DomainValue, index: (DefaultTypeLevelReferenceValues.this)#DomainValue, arrayref: (DefaultTypeLevelReferenceValues.this)#DomainValue): (DefaultTypeLevelReferenceValues.this)#ArrayStoreResult
  55. final def isInstanceOf[T0]: Boolean
    Definition Classes
    Any
  56. final def isValueSubtypeOf(value: (DefaultTypeLevelReferenceValues.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.

  57. final def justThrows(value: (DefaultTypeLevelReferenceValues.this)#ExceptionValue): ThrowsException[(DefaultTypeLevelReferenceValues.this)#ExceptionValues]
    Definition Classes
    ReferenceValuesFactory
  58. def laload(pc: PC, index: (DefaultTypeLevelReferenceValues.this)#DomainValue, arrayref: (DefaultTypeLevelReferenceValues.this)#DomainValue): (DefaultTypeLevelReferenceValues.this)#ArrayLoadResult
  59. def lastore(pc: PC, value: (DefaultTypeLevelReferenceValues.this)#DomainValue, index: (DefaultTypeLevelReferenceValues.this)#DomainValue, arrayref: (DefaultTypeLevelReferenceValues.this)#DomainValue): (DefaultTypeLevelReferenceValues.this)#ArrayStoreResult
  60. def mergeDEComputations(pc: PC, c1: Computation[(DefaultTypeLevelReferenceValues.this)#DomainValue, (DefaultTypeLevelReferenceValues.this)#ExceptionValue], c2: Computation[(DefaultTypeLevelReferenceValues.this)#DomainValue, (DefaultTypeLevelReferenceValues.this)#ExceptionValue]): Computation[(DefaultTypeLevelReferenceValues.this)#DomainValue, (DefaultTypeLevelReferenceValues.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
  61. def mergeDEsComputations(pc: PC, c1: Computation[(DefaultTypeLevelReferenceValues.this)#DomainValue, (DefaultTypeLevelReferenceValues.this)#ExceptionValues], c2: Computation[(DefaultTypeLevelReferenceValues.this)#DomainValue, (DefaultTypeLevelReferenceValues.this)#ExceptionValues]): Computation[(DefaultTypeLevelReferenceValues.this)#DomainValue, (DefaultTypeLevelReferenceValues.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
  62. def mergeDomainValues(pc: PC, v1: (DefaultTypeLevelReferenceValues.this)#DomainValue, v2: (DefaultTypeLevelReferenceValues.this)#DomainValue): (DefaultTypeLevelReferenceValues.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
  63. def mergeEsComputations(pc: PC, c1: Computation[Nothing, (DefaultTypeLevelReferenceValues.this)#ExceptionValues], c2: Computation[Nothing, (DefaultTypeLevelReferenceValues.this)#ExceptionValues]): Computation[Nothing, (DefaultTypeLevelReferenceValues.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
  64. def mergeMultipleExceptionValues(pc: PC, v1s: (DefaultTypeLevelReferenceValues.this)#ExceptionValues, v2s: (DefaultTypeLevelReferenceValues.this)#ExceptionValues): (DefaultTypeLevelReferenceValues.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
  65. def multianewarray(pc: PC, counts: (DefaultTypeLevelReferenceValues.this)#Operands, arrayType: ArrayType): Computation[(DefaultTypeLevelReferenceValues.this)#DomainArrayValue, (DefaultTypeLevelReferenceValues.this)#ExceptionValue]

    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.

  66. final def ne(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  67. def newarray(pc: PC, count: (DefaultTypeLevelReferenceValues.this)#DomainValue, componentType: FieldType): Computation[(DefaultTypeLevelReferenceValues.this)#DomainValue, (DefaultTypeLevelReferenceValues.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.

  68. final def notify(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native()
  69. final def notifyAll(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native()
  70. def properties(pc: PC, propertyToString: (AnyRef) ⇒ String = (v) ⇒ v.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
  71. def refAreEqual(pc: PC, value1: (DefaultTypeLevelReferenceValues.this)#DomainValue, value2: (DefaultTypeLevelReferenceValues.this)#DomainValue): Answer

    Tests if both values refer to the same object instance.

    Tests if both values refer to the same object instance.

    Though this is in general intractable, there are some cases where a definitive answer is possible.

    This implementation completely handles the case where at least one value definitively represents the null value. Additionally, if we have precise type information and the types are different, No is returned. Otherwise, Unknown is returned.

    value1

    A value of type ReferenceValue.

    value2

    A value of type ReferenceValue.

    Definition Classes
    TypeLevelReferenceValuesReferenceValuesDomain
    Note

    This method is intended to be overridden by subclasses and may be the first one that is called (by means of super) by the overriding method to handle checks related to null. E.g.

    super.areEqualReferences(value1,value2).ifUnknown {
        ...
    }
  72. def refAreNotEqual(pc: PC, value1: (DefaultTypeLevelReferenceValues.this)#DomainValue, value2: (DefaultTypeLevelReferenceValues.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
  73. def refEstablishAreEqual(pc: PC, value1: (DefaultTypeLevelReferenceValues.this)#DomainValue, value2: (DefaultTypeLevelReferenceValues.this)#DomainValue, operands: (DefaultTypeLevelReferenceValues.this)#Operands, locals: (DefaultTypeLevelReferenceValues.this)#Locals): ((DefaultTypeLevelReferenceValues.this)#Operands, (DefaultTypeLevelReferenceValues.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
  74. def refEstablishAreNotEqual(pc: PC, value1: (DefaultTypeLevelReferenceValues.this)#DomainValue, value2: (DefaultTypeLevelReferenceValues.this)#DomainValue, operands: (DefaultTypeLevelReferenceValues.this)#Operands, locals: (DefaultTypeLevelReferenceValues.this)#Locals): ((DefaultTypeLevelReferenceValues.this)#Operands, (DefaultTypeLevelReferenceValues.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
  75. def refEstablishIsNonNull(pc: PC, value: (DefaultTypeLevelReferenceValues.this)#DomainValue, operands: (DefaultTypeLevelReferenceValues.this)#Operands, locals: (DefaultTypeLevelReferenceValues.this)#Locals): ((DefaultTypeLevelReferenceValues.this)#Operands, (DefaultTypeLevelReferenceValues.this)#Locals)

    Called by OPAL-AI when it establishes that the value is guaranteed not to be null.

    Called by OPAL-AI when it establishes that the value is guaranteed not to be null. E.g., after a comparison with null OPAL can establish that the value has to be null on one branch and that the value is not null on the other branch.

    Definition Classes
    ReferenceValuesDomain
  76. def refEstablishIsNull(pc: PC, value: (DefaultTypeLevelReferenceValues.this)#DomainValue, operands: (DefaultTypeLevelReferenceValues.this)#Operands, locals: (DefaultTypeLevelReferenceValues.this)#Locals): ((DefaultTypeLevelReferenceValues.this)#Operands, (DefaultTypeLevelReferenceValues.this)#Locals)

    Called by the framework when the value is known to be null/has to be null.

    Called by the framework when the value is known to be null/has to be null. E.g., after a comparison with null (IFNULL/IFNONNULL) OPAL-AI knows that the value has to be null on one branch and that the value is not null on the other branch.

    Definition Classes
    ReferenceValuesDomain
  77. def refIsNonNull(pc: PC, value: (DefaultTypeLevelReferenceValues.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
  78. final def refIsNull(pc: PC, value: (DefaultTypeLevelReferenceValues.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
  79. def refSetUpperTypeBoundOfTopOperand(pc: PC, upperTypeBound: ReferenceType, operands: (DefaultTypeLevelReferenceValues.this)#Operands, locals: (DefaultTypeLevelReferenceValues.this)#Locals): ((DefaultTypeLevelReferenceValues.this)#Operands, (DefaultTypeLevelReferenceValues.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
    TypeLevelReferenceValuesReferenceValuesDomain
  80. def refTopOperandIsNull(pc: PC, operands: (DefaultTypeLevelReferenceValues.this)#Operands, locals: (DefaultTypeLevelReferenceValues.this)#Locals): ((DefaultTypeLevelReferenceValues.this)#Operands, (DefaultTypeLevelReferenceValues.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 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
    TypeLevelReferenceValuesReferenceValuesDomain
  81. def saload(pc: PC, index: (DefaultTypeLevelReferenceValues.this)#DomainValue, arrayref: (DefaultTypeLevelReferenceValues.this)#DomainValue): (DefaultTypeLevelReferenceValues.this)#ArrayLoadResult
  82. def sastore(pc: PC, value: (DefaultTypeLevelReferenceValues.this)#DomainValue, index: (DefaultTypeLevelReferenceValues.this)#DomainValue, arrayref: (DefaultTypeLevelReferenceValues.this)#DomainValue): (DefaultTypeLevelReferenceValues.this)#ArrayStoreResult
  83. def summarize(pc: PC, values: Iterable[(DefaultTypeLevelReferenceValues.this)#DomainValue]): (DefaultTypeLevelReferenceValues.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.

  84. final def synchronized[T0](arg0: ⇒ T0): T0
    Definition Classes
    AnyRef
  85. final def throws(value: (DefaultTypeLevelReferenceValues.this)#ExceptionValue): ThrowsException[(DefaultTypeLevelReferenceValues.this)#ExceptionValue]
    Definition Classes
    ReferenceValuesFactory
  86. def toJavaObject(pc: PC, value: (DefaultTypeLevelReferenceValues.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
    TypeLevelReferenceValuesAsJavaObject
    Note

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

  87. def toString(): String
    Definition Classes
    AnyRef → Any
  88. def typeOfValue(value: (DefaultTypeLevelReferenceValues.this)#DomainValue): TypeInformation

    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
  89. final def wait(): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  90. final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  91. final def wait(arg0: Long): Unit
    Definition Classes
    AnyRef
    Annotations
    @native() @throws( ... )
  92. object ArrayValue

    Enables matching of DomainValues that are array values.

  93. object MObjectValue
  94. object SObjectValue
  95. object IsNull
    Definition Classes
    TypeLevelReferenceValues
  96. object IsPrecise
    Definition Classes
    TypeLevelReferenceValues
  97. object UpperTypeBound
    Definition Classes
    TypeLevelReferenceValues

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